PUBLICATIONS DE l'UNIVERSITE DE BOURGOGNE EXTRAITES DU WEB OF SCIENCE ET INCLUSES DANS LE PROJET "IPERU" DE L'OBSERVATOIRE DES SCIENCES ET DES TECHNIQUES (OST)
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  • Conrath, U.; Beckers, G. J. M.; Flors, V.; Garcia-Agustin, P.; Jakab, G.; Mauch, F.; Newman, M. A.; Pieterse, C. M. J.; Poinssot, B.; Pozo, M. J.; Pugin, A.; Schaffrath, U.; Ton, J.; Wendehenne, D.; Zimmerli, L. & Mauch-Mani, B.
    | Priming: Getting ready for battle
    | Molecular Plant-microbe Interactions, 2006 , 19 , 1062-1071 , DOI 10.1094/MPMI-19-1062 | Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Plant Sciences | cited 117 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT ; SVT / Code(s) unite(s) : UMR5584 ; UMR5184-1088 ; UMR692 ; ERITM207 )
  • 2010.05.25
    Abstract:
    Infection of plants by necrotizing pathogens or colonization of plant roots with certain beneficial microbes causes the induction of a unique physiological state called "priming." The primed state can also be induced by treatment of plants with various natural and synthetic compounds. Primed plants display either faster, stronger, or both activation of the various cellular defense responses that are induced following attack by either pathogens or insects or in response to abiotic stress. Although the phenomenon has been known for decades, most progress in our understanding of priming has been made over the past few years. Here, we summarize the current knowledge of priming in various induced-resistance phenomena in plants.
  • Zhu, L. M.; Vranckx, R.; Van Kien, P. K.; Lalande, A.; Boisset, N.; Mathieu, F.; Wegman, M.; Glancy, L.; Gasc, J. M.; Brunotte, F. O.; Bruneval, P.; Wolf, J. E.; Michel, J. B. & Jeunemaitre, X.
    | Mutations in myosin heavy chain 11 cause a syndrome associating thoracic aortic aneurysm/aortic dissection and patent ductus arteriosus
    | Nature Genetics, 2006 , 38 , 343-349 , DOI 10.1038/ng1721 | Genetics & Heredity | cited 64 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 ; EA2979 )
  • 2010.05.25
    Abstract:
    We have recently described two kindreds presenting thoracic aortic aneurysm and/or aortic dissection ( TAAD) and patent ductus arteriosus (PDA)(1,2) and mapped the disease locus to 16p12.2-p13.13 (ref. 3). We now demonstrate that the disease is caused by mutations in the MYH11 gene affecting the C-terminal coiled-coil region of the smooth muscle myosin heavy chain, a specific contractile protein of smooth muscle cells (SMC). All individuals bearing the heterozygous mutations, even if asymptomatic, showed marked aortic stiffness. Examination of pathological aortas showed large areas of medial degeneration with very low SMC content. Abnormal immunological recognition of SM-MHC and the colocalization of wild-type and mutant rod proteins in SMC, in conjunction with differences in their coimmunoprecipitation capacities, strongly suggest a dominant-negative effect. Human MYH11 gene mutations provide the first example of a direct change in a specific SMC protein leading to an inherited arterial disease.
  • Perruchet, P. & Pacton, S.
    | Implicit learning and statistical learning: one phenomenon, two approaches
    | Trends In Cognitive Sciences, 2006 , 10 , 233-238 , DOI 10.1016/j.tics.2006.03.006 | Behavioral Sciences; Neurosciences; Psychology, Experimental | cited 51 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    The domain-general learning mechanisms elicited in incidental learning situations are of potential interest in many research fields, including language acquisition, object knowledge formation and motor learning. They have been the focus of studies on implicit learning for nearly 40 years. Stemming from a different research tradition, studies on statistical learning carried out in the past 10 years after the seminal studies by Saffran and collaborators, appear to be closely related, and the similarity between the two approaches is strengthened further by their recent evolution. However, implicit learning and statistical learning research favor different interpretations, focusing on the formation of chunks and statistical computations, respectively. We examine these differing approaches and suggest that this divergence opens up a major theoretical challenge for future studies.
  • Griffith, C. A.; Penteado, P.; Rannou, P.; Brown, R.; Boudon, V.; Baines, K. H.; Clark, R.; Drossart, P.; Buratti, B.; Nicholson, P.; McKay, C. P.; Coustenis, A.; Negrao, A. & Jaumann, R.
    | Evidence for a polar ethane cloud on Titan
    | Science, 2006 , 313 , 1620-1622 , DOI 10.1126/science.1128245 | Multidisciplinary Sciences | cited 50 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    Spectra from Cassini's Visual and Infrared Mapping Spectrometer reveal the presence of a vast tropospheric cloud on Titan at latitudes 51 degrees to 68 degrees north and all longitudes observed (10 degrees to 190 degrees west). The derived characteristics indicate that this cloud is composed of ethane and forms as a result of stratospheric subsidence and the particularly cool conditions near the moon's north pole. Preferential condensation of ethane, perhaps as ice, at Titan's poles during the winters may partially explain the lack of liquid ethane oceans on Titan's surface at middle and lower latitudes.
  • Bertrand, S.; Alonso-Alvarez, C.; Devevey, G.; Faivre, B.; Prost, J. & Sorci, G.
    | Carotenoids modulate the trade-off between egg production and resistance to oxidative stress in zebra finches
    | Oecologia, 2006 , 147 , 576-584 , DOI 10.1007/s00442-005-0317-8 | Ecology | cited 41 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 ; EA2422 )
  • 2010.05.25
    Abstract:
    The allocation of resources to reproduction and survival is a central question of studies of life history evolution. Usually, increased allocation to current reproduction is paid in terms of reduced future reproduction and/or decreased survival. However, the proximal mechanisms underlying the cost of reproduction are poorly understood. Recently, it has been shown that increased susceptibility to oxidative stress might be one of such proximate links between reproduction and self-maintenance. Organisms possess a range of antioxidant defenses, including endogenously produced molecules (e.g., enzymes) and compounds ingested with food (e.g., carotenoids). If reproductive effort increases the production of reactive oxygen species, the availability of antioxidant defenses may partly or fully counteract the free-radical damages. One could, therefore, expect that the trade-off between reproduction and oxidative stress is modulated by the availability of antioxidant defenses. We tested this hypothesis in zebra finches. We manipulated reproductive effort by either allowing or preventing pairs to breed. Within each breeding or non-breeding group, the availability of antioxidant compounds was manipulated by supplementing or not supplementing the drinking water with carotenoids. We found that although birds in the breeding and non-breeding groups did not differ in their resistance to oxidative stress (the breakdown of red blood cells submitted to a controlled free-radical attack), one aspect of breeding effort (i.e., the number of eggs laid by birds in both breeding and non-breeding groups) was negatively correlated with resistance to oxidative stress only in birds that did not benefit from a carotenoid-supplemented diet. This result therefore suggests that carotenoid availability can modulate the trade-off between reproduction and resistance to oxidative stress.
  • Bigand, E. & Poulin-Charronnat, B.
    | Are we "experienced listeners"? A review of the musical capacities that do not depend on formal musical training
    | Cognition, 2006 , 100 , 100-130 , DOI 10.1016/j.cognition.2005.11.007 | Psychology, Experimental | cited 41 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    The present paper reviews a set of studies designed to investigate different aspects of the capacity for processing Western music. This includes perceiving the relationships between a theme and its variations, perceiving musical tensions and relaxations, generating musical expectancies, integrating local structures in large-scale structures, learning new compositional systems and responding to music in an emotional (affective) way. The main focus of these studies was to evaluate the influence of intensive musical training on these capacities. The overall set of data highlights that some musical capacities are acquired through exposure to music without the help of explicit training. These capacities reach such a degree of sophistication that they enable untrained listeners to respond to music as "musically experienced listeners" do. (c) 2005 Elsevier B.V. All rights reserved.
  • Alonso-Alvarez, C.; Bertrand, S.; Devevey, G.; Prost, J.; Faivre, B.; Chastel, O. & Sorci, G.
    | An experimental manipulation of life-history trajectories and resistance to oxidative stress
    | Evolution, 2006 , 60 , 1913-1924 | Ecology; Evolutionary Biology; Genetics & Heredity | cited 39 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 ; EA2422 )
  • 2010.05.25
    Abstract:
    Optimal investment into life-history traits depends on the environmental conditions that organisms are likely to experience during their life. Evolutionary theory tells us that optimal investment in reproduction versus maintenance is likely to shape the pattern of age-associated decline in performance, also known as aging. The currency that is traded against different vital functions is, however, still debated. Here, we took advantage of a phenotypic manipulation of individual quality in early life to explore (1) long-term consequences on life-history trajectories, and (2) the possible physiological mechanism underlying the life-history adjustments. We manipulated phenotypic quality of a cohort of captive zebra finches (Taeniopygia guttata) by assigning breeding pairs to either an enlarged or a reduced brood. Nestlings raised in enlarged broods were in poorer condition than nestlings raised in reduced broods. Interestingly, the effect of environmental conditions experienced during early life extended to the age at first reproduction. Birds from enlarged broods delayed reproduction. Birds that delayed reproduction produced less offspring but lived longer, although neither fecundity nor longevity were directly affected by the experimental brood size. Using the framework of the life-table response experiment modeling, we also explored the effect of early environmental condition on population growth rate and aging. Birds raised in reduced broods tended to have a higher population growth rate, and a steeper decrease of reproductive value with age than birds reared in enlarged broods. Metabolic resources necessary to fight off the damaging effect of reactive oxygen species (ROS) could be the mechanism underlying the observed results, as (1) birds that engaged in a higher number of breeding events had a weaker red blood cell resistance to oxidative stress, (2) red blood cell resistance to oxidative stress predicted short-term mortality (but not longevity), and (3) was related with a parabolic function to age. Overall, these results highlight that early condition can have long-term effects on life-history trajectories by affecting key life-history traits such as age at first reproduction, and suggest that the trade-off between reproduction and self-maintenance might be mediated by the cumulative deleterious effect of ROS.
  • Gonzalez, M. U.; Weeber, J. C.; Baudrion, A. L.; Dereux, A.; Stepanov, A. L.; Krenn, J. R.; Devaux, E. & Ebbesen, T. W.
    | Design, near-field characterization, and modeling of 45 circle surface-plasmon Bragg mirrors
    | Physical Review B, 2006 , 73 , 155416 , DOI 10.1103/PhysRevB.73.155416 | Physics, Condensed Matter | cited 36 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    The development of surface plasmon polariton (SPP) optical elements is mandatory in order to achieve surface plasmon based photonics. A current approach to reach this goal is to take advantage of the interaction of SPP with defects and design elements obtained by the micro- or nano-structuration of the metal film. In this work, we have performed a detailed study of the performance and behavior of SPP-Bragg mirrors, designed for 45 degrees incidence, based on this approach. Mirrors consisting of gratings of both metal ridges on the metal surface and grooves engraved in the metal, fabricated by means of electron beam lithography and focused ion beam, have been considered. The performance of the mirrors has been characterized via near-field optical microscopy. An original procedure to obtain quantitative values of the mirrors' reflectivity and transmission coefficient from the near-field images is exposed. The mirrors composed of metal ridges are shown to act very efficiently, and a rather low number of elements (15 for the specific geometry studied) is able to deflect almost 100% of the incoming power. Conversely, the arrays of grooves produce a much lower reflectivity, which we attribute mostly to radiative scattering in the forward direction induced by the grooves. Besides, the considered systems have also been simulated by using the differential method. The results obtained from the numerical calculations present an excellent agreement with the experimental data, proving the reliability of this method to predict the behavior of this kind of systems while interacting with SPP. Based on the numerical modeling of the SPP-Bragg mirrors, the evolution of the mirrors' behavior with the ridges height is analyzed.
  • Bertling, M.; Braddy, S. J.; Bromley, R. G.; Demathieu, G. R.; Genise, J.; Mikulas, R.; Nielsen, J. K.; Nielsen, K. S. S.; Rindsberg, A. K.; Schlirf, M. & Uchman, A.
    | Names for trace fossils: a uniform approach
    | Lethaia, 2006 , 39 , 265-286 , DOI 10.1080/00241160600787890 | Paleontology | cited 34 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    The taxonomic treatment of trace fossils needs a uniform approach, independent of the ethologic groups concerned. To this aim, trace fossils are rigorously defined with regard to biological taxa and physical sedimentary structures. Potential ichnotaxobases are evaluated, with morphology resulting as the most important criterion. For trace fossils related to bioerosion and herbivory, substrate plays a key role, as well as composition for coprolites. Size, producer, age, facies and preservation are rejected as ichnotaxobases. Separate names for undertracks and other poorly preserved material should gradually be replaced by ichnotaxa based on well-preserved specimens. Recent traces may be identified using established trace fossil taxa but new names can only be based on fossil material, even if the distinction between recent and fossil may frequently remain arbitrary. It is stressed that ichnotaxa must not be incorporated into biological taxa in systematics. Composite trace fossil structures ( complex structures made by the combined activity of two or more species) have no ichnotaxonomic standing but compound traces ( complex structures made by one individual tracemaker) may be named separately under certain provisions. The following emendations are proposed to the International Code of Zoological Nomenclature: The term 'work of an animal' should be deleted from the code, and ichnotaxa should be based solely on trace fossils as defined herein.
  • Soto-Crespo, J. M.; Grelu, P. & Akhmediev, N.
    | Optical bullets and "rockets" in nonlinear dissipative systems and their transformations and interactions.
    | Optics Express, 2006 , 14 , 4013-4025 | Optics | cited 32 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We demonstrate the existence of stable optical light bullets in nonlinear dissipative media for both cases of normal and anomalous chromatic dispersion. The prediction is based on direct numerical simulations of the (3+1)-dimensional complex cubic-quintic Ginzburg-Landau equation. We do not impose conditions of spherical or cylindrical symmetry. Regions of existence of stable bullets are determined in the parameter space. Beyond the domain of parameters where stable bullets are found, unstable bullets can be transformed into "rockets" i.e. bullets elongated in the temporal domain. A few examples of the interaction between two optical bullets are considered using spatial and temporal interaction planes. (c) 2006 Optical Society of America.
  • Kanna, T.; Lakshmanan, M.; Dinda, P. T. & Akhmediev, N.
    | Soliton collisions with shape change by intensity redistribution in mixed coupled nonlinear Schrodinger equations
    | Physical Review E, 2006 , 73 , 026604 , DOI 10.1103/PhysRevE.73.026604 | Physics, Fluids & Plasmas; Physics, Mathematical | cited 29 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    A different kind of shape changing (intensity redistribution) collision with potential application to signal amplification is identified in the integrable N-coupled nonlinear Schrodinger (CNLS) equations with mixed signs of focusing- and defocusing-type nonlinearity coefficients. The corresponding soliton solutions for the N=2 case are obtained by using Hirota's bilinearization method. The distinguishing feature of the mixed sign CNLS equations is that the soliton solutions can both be singular and regular. Although the general soliton solution admits singularities we present parametric conditions for which nonsingular soliton propagation can occur. The multisoliton solutions and a generalization of the results to the multicomponent case with arbitrary N are also presented. An appealing feature of soliton collision in the present case is that all the components of a soliton can simultaneously enhance their amplitudes, which can lead to a different kind of amplification process without induced noise.
  • Pokroy, B.; Fitch, A. N.; Marin, F.; Kapon, M.; Adir, N. & Zolotoyabko, E.
    | Anisotropic lattice distortions in biogenic calcite induced by intra-crystalline organic molecules
    | Journal of Structural Biology, 2006 , 155 , 96-103 , DOI 10.1016/j.jsb.2006.03.008 | Biochemistry & Molecular Biology; Biophysics; Cell Biology | cited 29 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    We have performed precise structural measurements on five different calcitic seashells by high-resolution X-ray powder diffraction on a synchrotron beam line and by laboratory single crystal X-ray diffraction. The unit cell parameters a and c of biogenic calcite were found to be systematically larger than those measured in the non-biogenic calcite. The maximum lattice distortion (about 2 (.) 10(-3)) was detected along the c-axis. Under heat treatment above 200 degrees C, a pronounced lattice relaxation was observed, which allowed us to conclude that anisotropic lattice swelling in biogenic calcite is induced by organic macromolecules incorporated within the single crystal calcitic prisms during biomineralization. This conclusion is supported by the results of crystallization experiments in the presence of specific protein extracted from one of the shells. (c) 2006 Elsevier Inc. All rights reserved.
  • Krishtal, A.; Senet, P.; Yang, M. & Van Alsenoy, C.
    | A Hirshfeld partitioning of polarizabilities of water clusters
    | Journal of Chemical Physics, 2006 , 125 , 034312 , DOI 10.1063/1.2210937 | Physics, Atomic, Molecular & Chemical | cited 25 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    A new Hirshfeld partitioning of cluster polarizability into intrinsic polarizabilities and charge delocalization contributions is presented. For water clusters, density-functional theory calculations demonstrate that the total polarizability of a water molecule in a cluster depends upon the number and type of hydrogen bonds the molecule makes with its neighbors. The intrinsic contribution to the molecular polarizability is transferable between water molecules displaying the same H-bond scheme in clusters of different sizes, and geometries, while the charge delocalization contribution also depends on the cluster size. These results could be used to improve the existing force fields. (c) 2006 American Institute of Physics.
  • Fatome, J.; Pitois, S. & Millot, G.
    | 20-GHz-to-1-THz repetition rate pulse sources based on multiple four-wave mixing in optical fibers
    | Ieee Journal of Quantum Electronics, 2006 , 42 , 1038-1046 , DOI 10.1109/JQE.2006.881826 | Engineering, Electrical & Electronic; Physics, Applied | cited 24 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    In this paper, we theoretically and experimentally study the generation of very high-repetition-rate pulse sources based on multiple four-wave mixing in optical fibers. More precisely, we described the generation of nearly transform-limited pulses at repetition rates of 20, 40, 80, 160, 320, 640 GHz, and 1 THz with a wavelength tunability close to 20 nm around 1555 nm. In particular, frequency resolved optical gating analyses show that 170-fs transform-limited pulses have been generated at 1 THz.
  • Tanaka, M.; Ohkubo, K.; Gros, C. P.; Guilard, R. & Fukuzumi, S.
    | Persistent electron-transfer state of a pi-complex of acridinium ion inserted between porphyrin rings of cofacial bisporphyrins
    | Journal of the American Chemical Society, 2006 , 128 , 14625-14633 , DOI 10.1021/ja064678b | Chemistry, Multidisciplinary | cited 24 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5633 )
  • 2010.05.25
    Abstract:
    A free-base cofacial bisporphyrin, H(4)DPOx, forms a pi-complex with acridinium ion (AcH+) by pi-pi interaction in benzonitrile (PhCN). Formation of the H(4)DPOx-AcH+ pi-complex was probed by UV-vis and NMR spectroscopy. The binding constant between AcH+ and H(4)DPOx is determined as 9.7 x 10(4) M-1. Photoinduced electron transfer (ET) from the H(4)DPOx to the AcH+ moiety occurred efficiently in the d-complex to form the ET state (H(4)DPOx(center dot+)-AcH center dot). The ET state is successfully detected by laser flash photolysis. The lifetime of the ET state is 18 mu s in PhCN at 298 K, and the quantum yield of the ET state is 90%. The temperature dependence of the ET state lifetime has been examined in the range from 273 to 353 K. The ET state lifetime exhibited a large temperature dependence, and the linear plot of In(k(BET) T-1/2) vs T-1, in accordance with the Marcus equation, affords the ET reorganization energy (0.54 eV). As a result, a remarkably long-lived ET state has been attained at low temperature, and virtually no decay of the ET state was observed at 77 K. Such an extremely long-lived ET state is indeed detected by steadystate UV-vis absorption spectroscopy.
  • Coustenis, A.; Negrao, A.; Salama, A.; Schulz, B.; Lellouch, E.; Rannou, P.; Drossart, P.; Encrenaz, T.; Schmitt, B.; Boudon, V. & Nikitin, A.
    | Titan's 3-micron spectral region from ISO high-resolution spectroscopy
    | Icarus, 2006 , 180 , 176-185 , DOI 10.1016/j.icarus.2005.08.007 | Astronomy & Astrophysics | cited 23 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    The near-infrared spectrum of Titan, Saturn's largest moon and one of the Cassini/Huygens' space mission primary targets, covers the 0.8 to 5 micron region in which it shows several weak CH4 absorption regions, and in particular one centered near 2.75 micron. Due to the interference of telluric absorption, only part of this window region (2.9-3.1 mu m) has previously been observed from the ground [Noll, K.S., Geballe, T.R., Knacke, R., Pendleton, F., Yvonne, J., 1996. Icarus 124, 625-63 1; Griffith, C.A., Owen, T., Miller, G.A., Geballe, T., 1998. Nature 395, 575-578; Griffith, C.A., Owen, T., Geballe, T.R., Rayner, J., Rannou, P., 2003. Science 300, 628-630; Geballe, T.R., Kim, S.J., Noll, K.S., Griffith, C.A., 2003. Astrophys. J. 583, L39-L42]. We report here on the first spectroscopic observations of Titan covering the whole 2.4-4.9 mu m region by two instruments on board the Infrared Space Observatory (ISO) in 1997. These observations show the 2.75-mu m window in its complete extent for the first time. In this study we have also used a high-resolution Titan spectrum in the 2.9-3.6 mu m region taken with the Keck [Geballe, T.R., Kim, S.J., Noll, K.S., Griffith, C.A., 2003. Astrophys. J. 583, L39-L42; Kim, S.J., Geballe, T.R., Noll, K.S., Courtin, R., 2005. Icarus 173, 522-532] to infer information on the atmospheric parameters (haze extinction, single scattering albedo, methane abundance, etc.) by fitting the methane bands with a detailed microphysical model of Titan's atmosphere (updated from Rannou, P., McKay, C.P., Lorenz, R.D., 2003. Planet. Space Sci. 51, 963-976). We have included in this study an updated version of a database for the CH4 absorption coefficients [STDS, Wenger, Ch., Champion, J.-P, 1998. J. Quant. Spectrosc. Radial. Transfer 59, 471-480. See also http://www.u-bourgogne.fr/LPUB/TSM/sTDS.html for latest updates; Boudon, V., Champion, J.-P., Gabard, T., Loete, M., Michelot, F., Pierre, G., Rotger, M., Wenger, Ch., Rey, M., 2004. J. Mol. Spectrosc. 228, 620-634]. For the atmosphere we find that (a) the haze extinction profile that best matches the data is one with higher (by 40%) extinction in the atmosphere with respect to Rannou et al. (2003) down to about 30 km where a complete cut-off occurs; (b) the methane mixing ratio at Titan's surface cannot exceed 3% on a disk-average basis, yielding a maximum CH4 column abundance of 2.27 km-am in Titan's atmosphere. From the derived surface albedo spectrum in the 2.7-3.08 micron region, we bring some constraints on Titan's surface composition. The albedo in the center of the methane window varies from 0.01 to 0.08. These values, compared to others reported in the other methane windows, show a strong compatibility with the water ice spectrum in the near-infrared. Without confirming its existence from this work alone, our data then appear to be compatible with water ice. A variety of other ices, such as CO2, NH3, tholin material or hydrocarbon liquid cannot be excluded from our data, but an additional unidentified component with a signature around 2.74 micron is required to satisfy the data. (c) 2005 Elsevier Inc. All rights reserved.
  • Soto-Crespo, J. M.; Akhmediev, N. & Grelu, P.
    | Optical bullets and double bullet complexes in dissipative systems
    | Physical Review E, 2006 , 74 , 046612 , DOI 10.1103/PhysRevE.74.046612 | Physics, Fluids & Plasmas; Physics, Mathematical | cited 23 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We show that optical light bullets can coexist with double bullet complexes in nonlinear dissipative systems. Coexistence occurs for a relatively large range of the system parameters, and is associated with either marginal stability or bistable existence of the two dissipative soliton species. In the case of marginal stability, spontaneous transformations of single bullets into double bullet complexes are observed. Among the bistable cases, we show how both clockwise and anticlockwise rotating double bullet complexes can be formed out of the phase-controlled interaction of two single bullets. The internal dynamics of pulsating double bullet complexes, with oscillations in both the spatial separation between the two bullets and the bullet shape in time domain is also detailed.
  • Biard, C.; Surai, P. F. & Moller, A. P.
    | Carotenoid availability in diet and phenotype of blue and great tit nestlings
    | Journal of Experimental Biology, 2006 , 209 , 1004-1015 , DOI 10.1242/jeb.02089 | Biology | cited 22 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 ; EA2422 )
  • 2010.05.25
    Abstract:
    Carotenoids are biologically active pigments of crucial importance for the development of avian embryos and nestlings. Thus parental ability to provide nestlings with a carotenoid- rich diet may enhance offspring fitness. However, very little is known about the possible effects of carotenoid availability in the diet on growing nestlings in natural populations. We experimentally manipulated dietary intake of carotenoids by nestlings of two closely related passerine species, the great tit Parus major and the blue tit Parus caeruleus, and measured nestling antioxidants, body condition, immunity and plumage colour. There was no detectable increase in plasma carotenoids after treatment in carotenoid- fed nestlings of either species despite regular supply of dietary carotenoids. However, in carotenoid- fed blue tit nestlings, plasma vitamin E concentration increased with plasma carotenoid concentration, while that was not the case for control nestlings. In both species, there was no significant effect of carotenoid supply on immune function. Carotenoid supplementation enhanced yellow feather colour in great tit nestlings only. In both species a strong effect of carotenoid supply was found on body condition with an increase in body mass for small carotenoid- fed nestlings compared to similarly sized control nestlings. Dietary availability of carotenoids may thus have important fitness consequences for tits. We hypothesise that the difference in effect of dietary carotenoids on the two species is due to relatively larger clutch size and higher growth rates of blue tits compared to great tits, leading to blue tit nestlings being more in need of carotenoids for antioxidant function than great tit nestlings.
  • Bertrand, S.; Faivre, B. & Sorci, G.
    | Do carotenoid-based sexual traits signal the availability of non-pigmentary antioxidants?
    | Journal of Experimental Biology, 2006 , 209 , 4414-4419 , DOI 10.1242/jeb.02540 | Biology | cited 21 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Carotenoid-based signals are thought to be indicators of male quality because they must be obtained from the diet and might thus indicate the ability of individuals to gather high-quality food. However, carotenoids are also known to have important physiological functions as immunoenhancers and antioxidants, and, as such, carotenoid-based sexual traits have also been suggested to reflect the health and antioxidant status of their bearers. This last idea is based on the hypothesis that carotenoids that are allocated to sexual signals are no longer available for the detoxification system. Recently, this hypothesis has been challenged on the grounds that the antioxidant activity is not the main biological role of carotenoids. Instead, carotenoid-based sexual traits might signal the availability of other non-pigmentary antioxidant molecules that might protect carotenoids from free radical attacks and make them available for sexual advertisements. We tested this hypothesis in the zebra finch, a passerine species with a carotenoid-based signal: the colour of the bill. We simultaneously manipulated the availability of carotenoids and of a non-pigmentary antioxidant (melatonin) in the drinking water. If the antioxidant properties of melatonin protect carotenoids from oxidation, we predict that birds supplemented with melatonin should have redder bills than birds not supplemented with melatonin, and that birds supplemented with carotenoids and melatonin should have redder bills than birds supplemented with carotenoids alone. Our findings are in agreement with these predictions since carotenoid and melatonin supplementation had an additive effect on bill colour. To our knowledge this is the first experimental evidence that a non-pigmentary antioxidant enhances the expression of a carotenoid-based sexual trait.
  • Di Lella, A.; Desbiens, N.; Boutin, A.; Demachy, I.; Ungerer, P.; Bellat, J. P. & Fuchs, A. H.
    | Molecular simulation studies of water physisorption in zeolites
    | Physical Chemistry Chemical Physics, 2006 , 8 , 5396-5406 , DOI 10.1039/b610621h | Chemistry, Physical; Physics, Atomic, Molecular & Chemical | cited 21 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    We report a series of Grand Canonical Monte Carlo simulations of water adsorption in NaY and NaX faujasite, as well as in silicalite-1. Computed adsorption isotherms and heats of adsorption were in good agreement with the available experiments. The existence of cyclic water hexamers in NaX located in the 12-ring windows, recently disclosed by neutron diffraction experiments (Hunger et al., J. Phys. Chem. B, 2006, 110, 342-353) was reproduced in our simulations. Interestingly enough, such cyclic hexamer clusters were also observed in the case of NaY, in which no stabilizing cation is present in the 12-ring window. We also report cation redistribution upon water adsorption for sodium faujasite with varying cation contents (Si : Al ratio in the range 1.53-3). A simple and transferable forcefield was used, that enabled to reproduce the different aspects of water physisorption in stable zeolites. The high pressure water condensation in hydrophobic silicalite-1 was reproduced without any parameter readjustment. The method and forcefield used here should be useful for engineering oriented applications such as the prediction of multi-component mixture adsorptive separations in various stable zeolites. It allows to address the issue of the effect of the small amounts of water that are almost inevitably present in zeolite-based separation processes.
  • Grillet, M.; Dartevelle, L. & Ferveur, J. F.
    | A Drosophila male pheromone affects female sexual receptivity
    | Proceedings of the Royal Society B-biological Sciences, 2006 , 273 , 315-323 , DOI 10.1098/rspb.2005.3332 | Biology; Ecology; Evolutionary Biology | cited 19 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5548 )
  • 2010.05.25
    Abstract:
    Sex pheromones are chemical signals frequently required for mate choice, but their reciprocal role on mate preference has rarely been shown in both sexes. In Drosophila melanogaster flies, the predominant cuticular hydrocarbons (CHs) are sexually dimorphic: only females produce 7,11-dienes, whereas 7-tricosene (7-T) is the principal male CH. Males generally prefer females with 7,11-dienes, but the role of 7-T on female behaviour remains unclear. With perfumed males, control females mated faster and more often with males carrying increased levels of 7-T showing that this CH acts as a chemical stimulant for D. melanogaster females. Control females-but not antenna-less females-could detect small variation of 7-T. Finally, our finding that desat1 mutant female showed altered response towards 7-T provides an additional role for this gene which affects the production and the perception of pheromones involved in mate choice, in both sexes.
  • Margueritat, J.; Gonzalo, J.; Afonso, C. N.; Mlayah, A.; Murray, D. B. & Saviot, L.
    | Surface plasmons and vibrations of self-assembled silver nanocolumns
    | Nano Letters, 2006 , 6 , 2037-2042 , DOI 10.1021/nl061237h | Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary | cited 19 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    Optical and vibrational properties of novel self-assembled silver nanocolumns are studied experimentally and theoretically. The split of the surface plasmon resonance into transverse and longitudinal modes verifies the one-dimensional character of the nanocolumns. In this work, we have identified the acoustic vibration modes of the nanocolumns using Raman scattering, as spheroid-like modes ( l = 2, m = +/- 2) involving vibrations of the nanocolumns along their minor axes and the existence of surface plasmon-vibration coupling mechanisms.
  • Andrieu, J.; Camus, J. M.; Richard, P.; Poli, R.; Gonsalvi, L.; Vizza, F. & Peruzzini, M.
    | Amino-phosphanes in Rh-I-catalyzed hydroformylation: Hemilabile behavior of P,N ligands under high CO pressure and catalytic properties
    | European Journal of Inorganic Chemistry, 2006 , 51-61 , DOI 10.1002/ejic.200500432 | Chemistry, Inorganic & Nuclear | cited 18 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    The catalytic properties of rhodium complexes containing the alpha-, beta, or gamma-amino-phosphane ligands Ph2PCH2NEt2 (alpha-P,N-1), Ph(2)pCH(Ar)NHPh [alpha-PN-2; Ar = eta(6)(o-C6H4Cl)Cr(CO)(3)], Ph2PCH2NPh2 (alpha-P,N-3), Ph2PCH2CH(Ph)NHPh (beta-P,N), Ph2PCH2(o-C6H4-NMe2) (gamma-P,N-1), Ph2PCH(o-C6H4CH2NHPh) (gamma-PN-2), and the alpha,beta-diamino-phosphane ligand Et2NCH2P(Ph)CH2CH(Ph)NHPh (alpha,beta-N,PN), in styrene hydroformylation have been examined. The results show that the activity increases when the number of backbone carbon atoms linking P and N decreases from 3 to 1. IR and P-31 HPNMR studies in solution show that all P,N ligands adopt exclusively a kappa(1)-P coordination mode in rhodium chloride carbonyl complexes under high CO pressure. In the solid state a kappa(1)-P-alpha-amino-phosphane coordination has been ascertained by X-ray methods in trans-[RhCl(CO)(gamma-P,N-1)(2)]. In contrast, an equilibrium between the kappa(2)-P,N and kappa(1)-P-coordination modes has been observed as a function of the CO pressure for the complex containing the beta-P,N ligand. The basicity of the dangling amino group also plays an important role on the catalytic activity and a mechanism involving the nitrogen function in the catalytic cycle is proposed. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
  • Boudon, V.; Rey, M. & Loete, M.
    | The vibrational levels of methane obtained from analyses of high-resolution spectra
    | Journal of Quantitative Spectroscopy & Radiative Transfer, 2006 , 98 , 394-404 , DOI 10.1016/j.jqsrt.2005.06.003 | Spectroscopy | cited 18 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    Methane and its tetrahedral isotopologues are spherical-top molecules whose high-resolution rovibrational spectra can only be analyzed in detail, thanks to sophisticated symmetry-adapted tensorial models. However, the effective Hamiltonian parameters of such models do not give direct access to the positions of the vibrational sublevels. In this paper, we present a calculation of the vibrational level positions for (CH4)-C-12, (CH4)-C-13, (CD4)-C-12 and (CD4)-C-13 performed using the effective Hamiltonian parameters obtained through recent analyses. We also include the results of a re-analysis of the octad system of (CH4)-C-12 performed with a higher order of the development which slightly improves the previous work on this polyad. (C) 2005 Elsevier Ltd. All rights reserved.
  • Kessler, H.; Schwarze, M.; Filipic, S.; Traue, H. C. & von Wietersheim, J.
    | Alexithymia and facial emotion recognition in patients with eating disorders
    | International Journal of Eating Disorders, 2006 , 39 , 245-251 , DOI 10.1002/eat.20228 | Psychology, Clinical; Nutrition & Dietetics; Psychiatry; Psychology | cited 18 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    Objective: Patients with anorexia or bulimia nervosa are reported to show high levels of alexithymia and to have difficulties recognizing facially displayed emotions. The current study tested whether it could be that facial emotion recognition is a basic skill that is independent from alexithymia. Method: We assessed emotion recognition skills and alexithymia in a group of 79 female inpatients with eating disorders and compared them with a group of 78 healthy female controls. Instruments used were the Toronto Alexithymia Scale, the Facially Expressed Emotion Labeling (FEEL) test, and the revised Symptom Check List (SCL-90-R). Results: There were no significant differences between patients and controls in their emotion recognition scores, but patients with eating disorders displayed significantly more alexithymia and psychopathology. Emotion recognition in patients was not related to alexithymia, psychopathology, or clinical symptoms. Conclusion: We suggest that the reported alexithymia of patients with eating disorders is complex and independent from basic facial emotion recognition. (c) 2006 by Wiley Periodicals, Inc.
  • Loosli, A.; Rusbandi, U. E.; Gradinaru, J.; Bernauer, K.; Schlaepfer, C. W.; Meyer, M.; Mazurek, S.; Novic, M. & Ward, T. R.
    | (Strept)avidin as host for biotinylated coordination complexes: Stability, chiral discrimination, and cooperativity
    | Inorganic Chemistry, 2006 , 45 , 660-668 , DOI 10.1021/ic051405t | Chemistry, Inorganic & Nuclear | cited 18 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5633 )
  • 2010.05.25
    Abstract:
    Incorporation of a biotinylated ruthenium tris(bipyridine) [Ru(bPY)(2)(Biot-bpy)](2+) (1) in either avidin or streptavidin-(strept)avidin-can be conveniently followed by circular dichroism spectroscopy. To determine the stepwise association constants, cooperativity, and chiral discrimination properties, diastereopure (Lambda and Delta)-1 species were synthesized and incorporated in tetrameric (strept)avidin to afford (Delta-[Ru(bPY)(2)(Biot-bpy)](2+))(x)subset of avidin, (Lambda-[Ru(bPY)(2)(Biot-bpy)](2+))(x)subset of cavidin, (Delta-[Ru(bpy)(2)(Biot-bpy)](2+))(x)subset of streptavidin, and (Lambda-[Ru(bpy)(2)(Biot-bpy)](2+))(x)subset of streptavidin (x = 1-4) For these four systems, the overall stability constants are log beta(4) = 28.6, 30.3, 36.2, and 36.4, respectively. Critical analysis of the CD titrations data suggests a strong cooperativity between the first and the second binding event (x = 1, 2) and a pronounced difference in affinity between avidin and streptavidin for the dicationic guest 1 as well as modest enantiodiscrimination properties with avidin as host.
  • Morel, O.; Stolz, C.; Meriaudeau, F. & Gorria, P.
    | Active lighting applied to three-dimensional reconstruction of specular metallic surfaces by polarization imaging
    | Applied Optics, 2006 , 45 , 4062-4068 | Optics | cited 18 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    In the field of industrial vision, the three-dimensional inspection of highly reflective metallic objects is still a delicate task. We deal with a new automated three-dimensional inspection system based on polarization analysis. We first present an extension of the shape-from-polarization method for dielectric surfaces to metallic surfaces. Then, we describe what we believe to be a new way of solving the ambiguity concerning the normal orientation with an active lighting system. Finally, applications to shape-defect detection are discussed, and the efficiency of the system to discriminate defects on specular metallic objects made by stamping and polishing is presented. (c) 2006 Optical Society of America.
  • Tillmann, B.; Koelseh, S.; Escoffier, N.; Bigand, E.; Lalitte, P.; Friederici, A. D. & von Cramon, D. Y.
    | Cognitive priming in sung and instrumental music: Activation of inferior frontal cortex
    | Neuroimage, 2006 , 31 , 1771-1782 , DOI 10.1016/j.neuroimage.2006.02.028 | Neurosciences; Neuroimaging; Radiology, Nuclear Medicine & Medical Imaging | cited 18 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    Neural correlates of the processing of musical syntax-like structures have been investigated via expectancy violation due to musically unrelated (i.e., unexpected) events in musical contexts. Previous studies reported the implication of inferior frontal cortex in musical structure processing. However - due to the strong musical manipulations activations might be explained by sensory deviance detection or repetition priming. Our present study investigated neural correlates of musical structure processing with subtle musical violations in a musical priming paradigm. Instrumental and sung sequences ended on related and less-related musical targets. The material controlled sensory priming components, and differences in target processing required listeners' knowledge on musical structures. Participants were scanned with functional Magnetic Resonance Imaging (fMRI) while performing speeded phoneme and timbre identification judgments on the targets. Behavioral results acquired in the scanner replicated the facilitation effect of related over less-related targets. The blood oxygen level-dependent (BOLD) signal linked to target processing revealed activation of right inferior frontal areas (i.e., inferior frontal gyrus, frontal operculum, anterior insula) that was stronger for less-related than for related targets, and this was independent of the material carrying the musical structures. This outcome points to the implication of inferior frontal cortex in the processing of syntactic relations also for musical material and to its role in the processing and integration of sequential information over time. In addition to inferior frontal activation, increased activation was observed in orbital gyrus, temporal areas (anterior superior temporal gyrus, posterior superior temporal gyrus and sulcus, posterior middle temporal gyrus) and supramarginal gyrus. (c) 2006 Elsevier Inc. All rights reserved.
  • Kadish, K. M.; Fremond, L.; Burdet, F.; Barbe, J. M.; Gros, C. P. & Guilard, R.
    | Cobalt(IV) corroles as catalysts for the electro reduction of O-2: Reactions of heterobimetallic dyads containing a face-to-face linked Fe(III) or Mn(III) porphyrin
    | Journal of Inorganic Biochemistry, 2006 , 100 , 858-868 , DOI 10.1016/j.jinorgbio.2006.01.010 | Biochemistry & Molecular Biology; Chemistry, Inorganic & Nuclear | cited 17 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5633 )
  • 2010.05.25
    Abstract:
    A series of heterobinuclear cofacial porphyrin-corrole dyads containing a Co(IV) corrole linked by one of four different spacers in a face-to-face arrangement with an Fe(III) or Mn(III) porphyrin have been examined as catalysts for the electroreduction of O-2 to H2O and/or H2O2 when adsorbed on the surface of a graphite electrode in air-saturated aqueous solutions containing 1 M HClO4. The examined compounds are represented as (PCY)M-III (ClCoCl)-Cl-IV where P is a porphyrin dianion, C is a corrole trianion and Y is a biphenylene (B), 9,9-dimethylxanthene (X), dibenzofuran (0) or anthracene (A) spacer. The catalytic behavior of the seven investigated dyads in the two heterobimetallic (PCY)MClCoCl series of catalysts is compared on one hand to what was previously reported for related dyads with a single Co(III) corrole macrocycle linked to a free-base porphyrin with the same set of linking bridges, (PCY)H2Co, and on the other hand to dicobalt porphyrin-corrole dyads of the form (PCY)Co, which were shown to efficiently electrocatalyze the four electron reduction of O-2, at a graphite electrode in acid media. Comparisons between the four series of porphyrin-corrole dyads, (PCY)Co,, (PCY)H2Co, (PCY)FeClCoCl and (PCY)MnClCoCl, show that in all cases the biscobalt dyads catalyze O-2 electroreduction at potentials more positive by an average 110 mV as compared to the related series of compounds containing a Co(III) or Co(IV) corrole macrocycle linked to a free-base metalloporphyrin or a metalloporphyrin with an Fe(III) or Mn(III) central metal ion. The data indicates that the E-1/2 values where electrocatalysis is initiated is related to the initial site of electron transfer, which is the Co(III)/Co(II) porphyrin reduction process in the case of (PCY)Co-2 and the Co(IV)/Co(III) corrole reduction in the case of (PCY)MnClCoCl, (PCY)FeClCoCl and (PCY)H2Co. The overall data also suggests that the catalytically active form of the biscobalt dyad in (PCY)Co-2 contains a Co(II) porphyrin and a Co(IV) corrole. (c) 2006 Elsevier Inc. All rights reserved.
  • Lacour, X.; Sangouard, N.; Guerin, S. & Jauslin, H. R.
    | Arbitrary state controlled-unitary gate by adiabatic passage
    | Physical Review A, 2006 , 73 , 042321 , DOI 10.1103/PhysRevA.73.042321 | Optics; Physics, Atomic, Molecular & Chemical | cited 17 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We propose a fast scheme involving atoms fixed in an optical cavity to directly implement the universal controlled-unitary gate. The present technique based on adiabatic passage uses dark states well suited for the controlled-rotation operation. We show that these dark states allow the robust implementation of a gate that is a generalization of the controlled-unitary gate to the case where the control qubit can be selected to be an arbitrary state. This gate has potential applications to the rapid implementation of quantum algorithms such as the projective measurement algorithm. This process is decoherence-free since excited atomic states and cavity modes are not populated during the dynamics.
  • Rouzee, A.; Guerin, S.; Boudon, V.; Lavorel, B. & Faucher, O.
    | Field-free one-dimensional alignment of ethylene molecule
    | Physical Review A, 2006 , 73 , 033418 , DOI 10.1103/PhysRevA.73.033418 | Optics; Physics, Atomic, Molecular & Chemical | cited 17 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We report an experimental study of nonadiabatic laser-induced molecular alignment of ethylene (C2H4) using a linearly polarized short laser pulse of moderate intensity. The information about the confinement of the C = C bond axis along the direction of the applied electric field is obtained by measuring the depolarization of a second short pulse of weak intensity interacting with the molecules after they have been exposed to the first pulse. The experimental data are compared with the numerical simulation of the Schrodinger equation written for the nonresonant interaction of an asymmetric top rigid rotor with a linearly polarized electric field. The field-free alignment is described by analyzing the time evolution of the angular distribution of the molecular axes together with the expectation value of the relevant squared direction cosine matrix elements.
  • Baudrion, A. L.; Weeber, J. C.; Dereux, A.; Lecamp, G.; Lalanne, P. & Bozhevolnyi, S. I.
    | Influence of the filling factor on the spectral properties of plasmonic crystals
    | Physical Review B, 2006 , 74 , 125406 , DOI 10.1103/PhysRevB.74.125406 | Physics, Condensed Matter | cited 16 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    Plasmonics crystals (PCs) comprised of finite-size triangular lattices of gold bumps deposited on a gold thin film are studied by means of a near-field optical microscope. The plasmonic crystals fabricated by electron-beam lithography are illuminated by an incident surface plasmon polariton excited in the Kretschmann-Raether configuration at the gold/air thin-film interface for incident free-space wavelengths in the range 740-820 nm. Based on the measurement of the surface plasmon polariton (SPP) damping distance in the crystals, the existence of a band gap for an incident SPP traveling along the two symmetry axes Gamma M and Gamma K is demonstrated. By increasing the lateral size of the bumps, the influence of the filling factor on the PC spectral properties is investigated. We show that, for the two Gamma M and Gamma K axes, the central gap frequency depends only weakly on the filling factor, whereas we observed a neat band-gap broadening for increasing filling factors. The experimental results are found to be consistent with the PC band structures computed by means of the differential method. In particular, a good agreement between the experimental and theoretical central gap frequencies for the two Gamma M and Gamma K axes is obtained. Finally, we investigate the origin of the band gap in PCs by computing modal reflectivity (or in-plane reflectivity) of semi-infinitely extended crystals. From these calculations, we show that the SPP propagation through a PC is inhibited by distributed reflection and not by losses channels such as absorption or out-of-plane scattering.
  • Bertrand, S.; Criscuolo, F.; Faivre, B. & Sorci, G.
    | Immune activation increases susceptibility to oxidative tissue damage in Zebra Finches
    | Functional Ecology, 2006 , 20 , 1022-1027 , DOI 10.1111/j.1365-2435.2006.01191.x | Ecology | cited 16 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    1. The innate immune response involves the production of highly reactive molecules (reactive oxygen and nitrogen species, ROS and RNS). These toxic compounds can effectively destroy invading pathogens but can also, non-specifically, target host cells. Tissue damage caused by ROS and RNS can be substantial if the inflammatory response is overactive, potentially inducing a so-called immunopathology. 2. In this study, we induced an inflammatory response in Zebra Finches by the way of a LPS injection (lipopolysaccharide of the cell wall of Escherichia coli), using as a control a group of birds injected with saline (phosphate-buffered saline). Body mass was measured both before and 24 h after the procedure. We also took a blood sample 24 h after injection, to measure the resistance of red blood cells to a standardized free radical attack. The experiment was repeated twice with different individuals to ascertain the repeatability of the results. 3. We found that birds injected with LPS lost significantly more body mass during the 24 It that followed, compared with control individuals. Similarly, LPS individuals were more susceptible to oxidative tissue damage, as their red blood cells had a weaker resistance to a free-radical attack than the red blood cells of control birds. 4. This result shows that the inflammatory response with the associated production of cytotoxic compounds can produce side-effects that may potentially result in increased damage to host tissues, therefore representing an immunopathology cost.
  • Moreau, J.; Benrey, B. & Thiery, D.
    | Assessing larval food quality for phytophagous insects: are the facts as simple as they appear?
    | Functional Ecology, 2006 , 20 , 592-600 , DOI 10.1111/j.1365-2435.2006.01145.x | Ecology | cited 16 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    1. We argue here that host plant quality affects many life-history traits of herbivorous insects and these traits often interact. Studies that look only at a limited number of traits often fail to determine the overall effect of plant quality on larval performance and adult fitness. Parameters such as mating success and adult longevity are frequently neglected even though they are affected by larval feeding and are crucial to overall fitness. 2. To illustrate this, we examined a whole suite of life-history traits of the moth Lobesia botrana after rearing larvae of this grape pest on three different grape cultivars. 3. Development time, mating success, fecundity, egg size and fertility were differentially affected by the cultivar on which the larvae were reared. Our results highlight that decreased fecundity can be balanced by an increase in egg size and fertility. 4. Throughout this study, we emphasize that drawing conclusions about larval food quality can be spurious when based on too few life-history traits. Therefore, it is essential to study all fitness related life-history traits to fully understand the effects of larval food quality on herbivore fitness.
  • Pitois, S.; Finot, C.; Fatome, J.; Sinardet, B. & Millot, G.
    | Generation of 20-GHz picosecond pulse and anomalous dispersion regimes trains in the normal of optical fibers
    | Optics Communications, 2006 , 260 , 301-306 , DOI 10.1016/j.optcom.2005.10.032 | Optics | cited 16 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    In this paper, we numerically and experimentally study two methods to generate 20-GHz pulse trains at 1550 nm from a dual-frequency beat-signal, The first method is based on the multiple four-wave mixing temporal compression occurring in the anomalous dispersion regime of a standard optical fiber (SMF). In the second original method, the initial sinusoidal signal is first converted into a parabolic pulses train through nonlinear propagation in a normally dispersive fiber. A subsequent linear compression in an anomalous dispersive fiber leads to well-separated picosecond pulses. (c) 2005 Elsevier B.V. All rights reserved.
  • Rousseau, G.; Desgranges, L.; Charlot, F.; Millot, N.; Niepce, J. C.; Pijolat, M.; Valdivieso, F.; Baldinozzi, G. & Berar, J. F.
    | A detailed study of UO2 to U3O8 oxidation phases and the associated rate-limiting steps
    | Journal of Nuclear Materials, 2006 , 355 , 10-20 , DOI 10.1016/j.jnucmat.2006.03.015 | Materials Science, Multidisciplinary; Nuclear Science & Technology; Mining & Mineral Processing | cited 16 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    The kinetic and crystalline evolutions of UO2 during its oxidation into U3O8 at 250 degrees C in air were studied by isothermal thermogravimetry and calorimetry, coupled with an in situ synchrotron X-ray diffraction on the D2AM-CRG beamline at ESRF. This study was aimed at determining experimentally the validity of the kinetic assumptions made in existing literature to account for the oxidation Of UO2 into U3O8 and also to determine precisely the structural evolution, in relation to the kinetic behaviour. Our results provide evidence of four distinct kinetic time domains, and the assumption of a single rate-limiting step is verified only for two of them. The crystalline phases associated with these domains are also identified. In fact, the first kinetic domain corresponds to the reaction Of UO2 into U4O9; the second one is linked to the two simultaneous reactions, UO2 into U4O9 and U4O9 into U3O7. Finally, the transition from U3O7 into U3O8 corresponds to the third and fourth kinetic domains. These results show that the oxidation Of UO2 into U3O8 cannot satisfactorily be described with modelling approaches used in the literature. A new general outline is proposed to study the oxidation of uranium oxides. This outline will improve both the understanding and predictions of oxidation processes at the relatively low temperatures that are expected during interim storage of spent nuclear fuel. (c) 2006 Elsevier B.V. All rights reserved.
  • Tonello, A.; Pitois, S.; Wabnitz, S.; Millot, G.; Martynkien, T.; Urbanczyk, W.; Wojcik, J.; Locatelli, A.; Conforti, M. & De Angelis, C.
    | Frequency tunable polarization and intermodal modulation instability in high birefringence holey fiber
    | Optics Express, 2006 , 14 , 397-404 | Optics | cited 16 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We present an experimental analysis of polarization and intermodal noise-seeded parametric amplification, in which dispersion is phase matched by group velocity mismatch between either polarization or spatial modes in birefringent holey fiber with elliptical core composed of a triple defect. By injecting quasi-CW intense linearly polarized pump pulses either parallel or at 45 degrees with respect to the fiber polarization axes, we observed the simultaneous generation of polarization or intermodal modulation instability sidebands. Furthermore, by shifting the pump wavelength from 532 to 625 nm, we observed a shift of polarization sidebands from 3 to 8 THz, whereas intermodal sidebands shifted from 33 to 63 THz. These observations are in excellent agreement with the experimental characterization and theoretical estimates of phase and group velocities for the respective fiber modes. (c) 2006 Optical Society of America.
  • Bollache, L.; Kaldonski, N.; Troussard, J. P.; Lagrue, C. & Rigaud, T.
    | Spines and behaviour as defences against fish predators in an invasive freshwater amphipod
    | Animal Behaviour, 2006 , 72 , 627-633 , DOI 10.1016/j.anbehav.2005.11.020 | Behavioral Sciences; Zoology | cited 15 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Selective predation may be an important proximate cause of the success or failure of invader species. Gammarus roeseli is an invasive amphipod, for which the causes of establishment in rivers where the native species, Gammarus pulex, predominates remain unstudied. Freshwater amphipods are important prey for numerous fish predators, but empirical evidence of lower predation rates on exotic prey is scarce. In laboratory experiments, we compared the susceptibility of G. pulex and G. roeseli to fish predation, determined the mechanisms influencing prey selection, and studied the interaction between behavioural and morphological defences. Fish predators (brown trout, Salmo trutta fario) preyed selectively on G. pulex, but not because of differences in attack or capture probability. The presence of spines in G. roeseli appeared to contribute to its underpredation. Differential prey selection in this case might therefore have resulted from the trout's reaction to an adverse stimulus. We found no significant difference in antipredator behaviour between G. pulex and G. roeseli. General behavioural differences were nevertheless found between species, with G. roeseli spending more time under shelters than G. pulex. However, microcosm experiments suggested that this difference was not important for differential predation. Antipredator behaviour may nevertheless be important for G. roeseli against other predators less sensitive to spines. (c) 2006 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.
  • Gras, C.; Gaffet, E. & Bernard, F.
    | Combustion wave structure during the MoSi2 synthesis by mechanically-activated self-propagating high-temperature synthesis (MASHS): in situ time-resolved investigations
    | Intermetallics, 2006 , 14 , 521-529 , DOI 10.1016/j.intermet.2005.09.001 | Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering | cited 15 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    In situ synchrotron time-resolved X-ray diffraction experiments coupled with an infrared imaging camera have been used to reveal the combustion wave structure during the production of MoSi2 by Mechanically Activated Self-propagating High-temperature Synthesis (MASHS). The fast combustion front exhibits a form described as an 'equilibrium structure' where the chemical reaction is the sole major driving force. In the MASHS process, oxide-free interfaces between Mo and Si nanocrystallites enhance the reaction Mo+2Si -> MoSi2. Exhaustive tithe-resolved investigations show a possible solid-state process in the first second of the reaction within the combustion front. If preheating is added, the reaction rate is increased, whereas, the presence of alpha- and beta-MoSi2 phases, produced during the ball milling (i.e. mechanical alloying), cause fluctuations in combustion rate. Therefore, an increasing of the mechanical pre-treatment duration leads Man unstable wave by acting directly on the thermal and matter transfer rates. (C) 2005 Elsevier Ltd. All rights reserved.
  • Perruchet, P.; Cleeremans, A. & Destrebecqz, A.
    | Dissociating the effects of automatic activation and explicit expectancy on reaction times in a simple associative learning task
    | Journal of Experimental Psychology-learning Memory and Cognition, 2006 , 32 , 955-965 , DOI 10.1037/0278-7393.32.5.955 | Psychology; Psychology, Experimental | cited 15 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    After repeated associations between two events, E1 and E2, responses to E2 can be facilitated either because participants consciously expect E2 to occur after El or because E1 automatically activates the response to E2, or because of both. In this article, the authors report on 4 experiments designed to pit the influence of these 2 factors against each other. The authors found that the fastest responses to a target in a reaction time paradigm occurred when automatic activation was highest and conscious expectancy lowest. These results, when considered together with previous findings indicating that, under most conditions, the relation between expectancy and reaction times is in the opposite direction, are indicative of a reversed association-an interaction pattern that J. C. Dunn and K. Kirsner (1988) demonstrated to be the only one that unambiguously points to the involvement of independent processes.
  • Tain, L.; Perrot-Minnot, M. J. & Cezilly, F.
    | Altered host behaviour and brain serotonergic activity caused by acanthocephalans: evidence for specificity
    | Proceedings of the Royal Society B-biological Sciences, 2006 , 273 , 3039-3045 , DOI 10.1098/rspb.2006.3618 | Biology; Ecology; Evolutionary Biology | cited 15 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Manipulative parasites can alter the phenotype of intermediate hosts in various ways. However, it is unclear whether such changes are just by-products of infection or adaptive and enhance transmission to the final host. Here, we show that the alteration of serotonergic activity is functionally linked to the alteration of specific behaviour in the amphipod Gammarus pulex infected with acanthocephalan parasites. Pomphorhynchus laevis and, to a lesser extent, Pomphorhynchus tereticollis altered phototactism, but not geotactism, in G. pulex, whereas the reverse was true for Polymorphus minutus. Serotonin (5-hydroxytryptamine, 5-HT) injected to uninfected G. pulex mimicked the altered phototactism, but had no effect on geotactism. Photophilic G. pulex infected with P. laevis or P. tereticollis showed a 40% increase in brain 5-HT immunoreactivity compared to photophobic, uninfected individuals. In contrast, brain 5-HT immunoreactivity did not differ between P. minutus-infected and uninfected G. pulex. Finally, brain 5-HT immunoreactivity differed significantly among P. tereticollis-infected individuals in accordance with their degree of manipulation. Our results demonstrate that altered 5-HT activity is not the mere consequence of infection by acanthocephalans but is specifically linked to the disruption of host photophobic behaviour, whereas the alteration of other behaviours such as geotactism may rely on distinct physiological routes.
  • Leonenko, Z.; Finot, E. & Cramb, D.
    | AFM study of interaction forces in supported planar DPPC bilayers in the presence of general anesthetic halothane
    | Biochimica Et Biophysica Acta-biomembranes, 2006 , 1758 , 487-492 , DOI 10.1016/j.bbamem.2006.02.033 | Biochemistry & Molecular Biology; Biophysics | cited 14 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    In spite of numerous investigations, the molecular mechanism of general anesthetics action is still not well understood. It has been shown that the anesthetic potency is related to the ability of an anesthetic to partition into the membrane. We have investigated changes in structure, dynamics and forces of interaction in supported dipalmitoylphosphatidylcholine (DPPC) bilayers in the presence of the general anesthetic halothane. In the present study, we measured the forces of interaction between the probe and the bilayer using an atomic force microscope. The changes in force curves as a function of anesthetic incorporation were analyzed. Force measurements were in good agreement with AFM imaging data, and provided valuable information on bilayer thickness, structural transitions, and halothane-induced changes in electrostatic and adhesive properties. (c) 2006 Elsevier B.V. All rights reserved.
  • Ballivet-Tkatchenko, D.; Burgat, R.; Chambrey, S.; Plasseraud, L. & Richard, P.
    | Reactivity of ditert-butyldimethoxystannane with carbon dioxide and methanol: X-ray structure of the resulting complex
    | Journal of Organometallic Chemistry, 2006 , 691 , 1498-1504 , DOI 10.1016/j.jorganchem.2005.11.013 | Chemistry, Inorganic & Nuclear; Chemistry, Organic | cited 13 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    The synthesis of dimethyl carbonate from carbon dioxide and methanol was studied with ditert-butyldimethoxystannane under pressure at temperatures <= 423 K. The formation of dimethyl carbonate is accompanied by transformation of the stannane into a trinuclear complex, the structure of which has been determined by single-crystal X-ray diffraction technique. The relevance of this specie in the catalytic cycle is demonstrated by conducting recycling runs. A preliminary kinetic study underlines the steric influence of the tert-butyl ancillary ligands in the stabilisation of intermediates, by comparison with the n-butyl homologue. (c) 2005 Elsevier B.V. All rights reserved.
  • Bezverkhyy, I.; Bouguessa, K.; Geantet, C. & Vrinat, M.
    | Adsorption of tetrahydrothiophene on faujasite type zeolites: Breakthrough curves and FTIR spectroscopy study
    | Applied Catalysis B-environmental, 2006 , 62 , 299-305 , DOI 10.1016/j.apcatb.2005.08.010 | Chemistry, Physical; Engineering, Environmental; Engineering, Chemical | cited 13 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    Adsorption of tetrahydrothiophene (THT) on NaX, CaX, AgX, and H-USY was studied by dynamic adsorption method and FTIR spectroscopy. The stoichiometric adsorption capacities are not very different for all materials, which is indicative of a complete micropore filling. In contrast, the overall rate constant of adsorption, determined from fitting the breakthrough curves with Bohart-Adams equation, is two times greater for H-USY than for type X zeolites. For NaX, CaX and H-USY, heating under N-2 flow at 300 degrees C allows to restore completely their initial adsorption capacities. In the case of AgX the same treatment results in a twofold lose of capacity accompanied by a collapse of the zeolite structure as evidenced by XRD. The nature of interaction between THT molecules and zeolites was characterized by FTIR spectroscopy. Only a weak interaction through hydrogen bonding was observed for THT on H-USY leading to an almost complete desorption at 100 degrees C. For NaX and CaX adsorbed molecules are gradually eliminated when heated to 300 degrees C while completely different pattern was observed for THT adsorbed on AgX on which the amount of the adsorbate remains nearly constant between 25 and 200 degrees C, but rapidly decreases on further heating. Such a behavior is indicative of much stronger interaction between THT molecules and Ag+ cations in agreement with the data on the regeneration of the adsorbents. (c) 2005 Elsevier B.V. All rights reserved.
  • Gilbert, Y.; Bachelot, R.; Royer, P.; Bouhelier, A.; Wiederrecht, G. P. & Novotny, L.
    | Longitudinal anisotropy of the photoinduced molecular migration in azobenzene polymer films
    | Optics Letters, 2006 , 31 , 613-615 | Optics | cited 13 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    The effects of tightly focused, higher-order laser beams on the photoinduced molecular migration and surface deformations in azobenzene polymer films are investigated. We demonstrate that the surface relief is principally triggered by longitudinal fields, i.e., electric fields polarized along the optical axis of the focused beam. Our findings can be explained by the translational diffusion of isomerized chromophores when the constraining effect of the polymer-air interface is considered. (c) 2006 Optical Society of America.
  • Jedrkiewicz, O.; Picozzi, A.; Clerici, M.; Faccio, D. & Di Trapani, P.
    | Emergence of X-shaped spatiotemporal coherence in optical waves
    | Physical Review Letters, 2006 , 97 , 243903 , DOI 10.1103/PhysRevLett.97.243903 | Physics, Multidisciplinary | cited 13 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    Considering the problem of parametric nonlinear interaction, we report the experimental observation of electromagnetic waves characterized by an X-shaped spatiotemporal coherence; i.e., coherence is neither spatial nor temporal, but skewed along specific spatiotemporal trajectories. The application of the usual, purely spatial or temporal, measures of coherence would erroneously lead to the conclusion that the field is fully incoherent. Such hidden coherence has been identified owing to an innovative diagnostic technique based on simultaneous analysis of both the spatial and temporal spectra.
  • Mardesic, P.; Marin, D. & Villadelprat, J.
    | The period function of reversible quadratic centers
    | Journal of Differential Equations, 2006 , 224 , 120-171 , DOI 10.1016/j.jde.2005.07.024 | Mathematics | cited 13 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    In this paper we investigate the bifurcation diagram of the period function associated to a family of reversible quadratic centers, namely the dehomogenized Loud's systems. The local bifurcation diagram of the period function at the center is fully understood using the results of Chicone and Jacobs [Bifurcation of critical periods for plane vector fields, Trans. Amer. Math. Soc. 312 (1989) 433-486]. Most of the present paper deals with the local bifurcation diagram at the polycycle that bounds the period annulus of the center. The techniques that we use here are different from the ones in [C. Chicone, M. Jacobs, Bifurcation of critical periods for plane vector fields, Trans. Amer. Math. Soc. 312 (1989) 433-486] because, while the period function extends analytically at the center, it has no smooth extension to the polycycle. At best one can hope that it has some asymptotic expansion. Another major difficulty is that the asymptotic development has to be uniform with respect to the parameters, in order to prove that a parameter is not a bifurcation value. We study also the bifurcations in the interior of the period annulus and we show that there exist three germs of curves in the parameter space that correspond to this type of bifurcation. Moreover we determine some regions in the parameter space for which the corresponding period function has at least one or two critical periods. Finally we propose a complete conjectural bifurcation diagram of the period function of the dehomogenized Loud's systems. Our results can also be viewed as a contribution to the proof of Chicone's conjecture [C. Chicone, review in MathSciNet. ref. 94h:58072]. (c) 2005 Elsevier lnc. All rights reserved.
  • Pitois, S.; Lagrange, S.; Jauslin, H. R. & Picozzi, A.
    | Velocity locking of incoherent nonlinear wave packets
    | Physical Review Letters, 2006 , 97 , 033903 , DOI 10.1103/PhysRevLett.97.033902 | Physics, Multidisciplinary | cited 13 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We show both theoretically and experimentally in an optical fiber system that a set of incoherent nonlinear waves irreversibly evolves to a specific equilibrium state, in which the individual wave packets propagate with identical group velocities. This intriguing process of velocity locking can be explained in detail by simple thermodynamic arguments based on the kinetic wave theory. Accordingly, the selection of the velocity-locked state is shown to result from the natural tendency of the isolated wave system to approach the state that maximizes the nonequilibrium entropy.
  • Poulin, J.; Stern, C.; Guilard, R. & Harvey, P. D.
    | Photophysical properties of a rhodium tetraphenylporphyrin-tin corrole dyad. The first example of a through metal-metal bond energy transfer
    | Photochemistry and Photobiology, 2006 , 82 , 171-176 , DOI 10.1562/2005-06-16-RA-577 | Biochemistry & Molecular Biology; Biophysics | cited 13 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5633 )
  • 2010.05.25
    Abstract:
    The luminescence spectroscopy study and the determination of the photophysical parameters for the M-M'-bonded rhodium, meso-tetraphenylporphyrin-tin(2,3,7,13,17,18-hexamethyl- 8,12-diethylcorrole) complex, (TPP)Rh-Sn(Me(6)Et(2)Cor) 1, was investigated. The emission bands as well as the lifetimes (tau(e)) and the quantum yields (Phi(e); at 77 K using 2MeTHF as solvent) were compared with those of (TPP)RhI 2 (TPP = tetraphenylporphyrin) and (Me(6)Et(2)Cor)SnCl 3 (Me(6)Et(2)Cor = 2,3,7,13,17,18-hexamethyl-8,12-diethylcorrole) which are the two chemical precursors of 1. The energy diagram has been established from the absorption, fluorescence and phosphorescence spectra. The Rh(TPP) and Sn(Me(6)Et(2)Cor) chromophores are the energy donor (D) and acceptor (A), respectively. The total absence of fluorescence in 1 (while fluorescence is observed in the tin derivative 3) indicates efficient excited state deactivation, presumably due to heavy atom effect and intramolecular energy transfer (ET). The large decreases in tau(p) and Phi(p) of the Rh(TPP) chromophore going from 2 to 1 indicate a significant intramolecular ET in the triplet states of I with an estimated rate ranging between 10(6) and 10(8) s(-1). Based on the comparison of transfer rates with other related dyads that exhibit similar D-A separations and no M-M' bond, and for which slower through space ET processes (10(2)-10(3) s(-1)) operate, a through M-M' bond ET has been unambiguously assigned to 1.
  • Sugny, D.; Kontz, C.; Ndong, M.; Justum, Y.; Dive, G. & Desouter-Lecomte, M.
    | Laser control in a bifurcating region
    | Physical Review A, 2006 , 74 , 043419 , DOI 10.1103/PhysRevA.74.043419 | Optics; Physics, Atomic, Molecular & Chemical | cited 13 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We present a complete analysis of the laser control of a model molecular system using both optimal control theory and adiabatic techniques. This molecule has a particular potential energy surface with a bifurcating region connecting three potential wells which allows a variety of processes such as isomerization, tunneling, or implementation of quantum gates on one or two qubits. The parameters of the model have been chosen so as to reproduce the main features of H3CO which is a molecule benchmark for such dynamics. We show the feasibility of different processes and we investigate their robustness against variations of laser field. We discuss the conditions under which each method of control gives the best results. We also point out the relation between optimal control theory and local control.
  • Brygo, F.; Dutouquet, C.; Le Guern, F.; Oltra, R.; Semerok, A. & Weulersse, J. M.
    | Laser fluence, repetition rate and pulse duration effects on paint ablation
    | Applied Surface Science, 2006 , 252 , 2131-2138 , DOI 10.1016/j.apsusc.2005.02.143 | Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter | cited 12 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    The efficiency (mm(3)/(J pulse)) of laser ablation of paint was investigated with nanosecond pulsed Nd:YAG lasers (lambda = 532 nm) as a function of the following laser beam parameters: pulse repetition rate (1-10,000 Hz), laser fluence (0.1-5 J/cm(2)) and pulse duration (5 ns and 100 ns). In our study, the best ablation efficiency (eta congruent to 0.3 mm(3)/j) was obtained with the highest repetition rate (10 kHz) at the fluence F = 1.5 J/cm(2). This ablation efficiency can be associated with heat accumulation at high repetition rate, which leads to the ablation threshold decrease. Despite the low thermal diffusivity and the low optical absorption of the paint (thermal confinement regime), the ablation threshold fluence was found to depend on the pulse duration. At high laser fluence, the ablation efficiency was lower for 5 ns pulse duration than for the one of 100 ns. This difference in efficiency is probably due to a high absorption of the laser beam by the ejected matter or the plasma at high laser intensity. Accumulation of particles at high repetition rate laser ablation and surface shielding was studied by high speed imaging. (c) 2005 Elsevier B.V. All rights reserved.
  • Degasperis, A.; Conforti, M.; Baronio, F. & Wabnitz, S.
    | Stable control of pulse speed in parametric three-wave solitons
    | Physical Review Letters, 2006 , 97 , 093901 , DOI 10.1103/PhysRevLett.97.093901 | Physics, Multidisciplinary | cited 12 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We analyze the control of the propagation speed of three wave packets interacting in a medium with quadratic nonlinearity and dispersion. We find analytical expressions for mutually trapped pulses with a common velocity in the form of a three-parameter family of solutions of the three-wave resonant interaction. The stability of these novel parametric solitons is simply related to the value of their common group velocity.
  • Domenichini, B.; Rizzi, G. A.; Kruger, P.; Della Negra, M.; Li, Z. S.; Petukhov, M.; Granozzi, G.; Moller, P. J. & Bourgeois, S.
    | Experimental and theoretical evidence for substitutional molybdenum atoms in the TiO2(110) subsurface
    | Physical Review B, 2006 , 73 , 245433 , DOI 10.1103/PhysRevB.73.245433 | Physics, Condensed Matter | cited 12 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    Molybdenum was deposited at room temperature on the TiO2(110) surface in the 0-1.3 equivalent monolayer (eqML) range and was then annealed at 400 degrees C in order to reach a kind of equilibrium state. A threshold was found in the behavior of the deposit: below 0.2 eqML, substitutional molybdenum occurs in titanium sites located under the bridging oxygen atoms of the TiO2(110) surface. In this position, molybdenum atoms are in a structural and chemical MoO2-like environment. Density-functional theory calculations show that this molybdenum site is actually the most stable one in the case of isolated molybdenum atoms. Angle-scanned photoelectron diffraction data are in perfect agreement with such a hypothesis. For deposits higher than 0.2 eqML, the increased amount of molybdenum atoms raises the probability of Mo-Mo interactions during the annealing at 400 degrees C, taking to a reduction process of the deposit. However, such annealing does not allow the deposit to become fully metallic: molybdenum clusters formed during the annealing are in strong interaction with the substrate, and metallic molybdenum can be obtained only depositing a film thicker than 1 ML.
  • Gros, C. P.; Barbe, J. M.; Espinosa, E. & Guilard, R.
    | Room-temperature autoconversion of free-base corrole into free-base porphyrin
    | Angewandte Chemie-international Edition, 2006 , 45 , 5642-5645 , DOI 10.1002/anie.200601580 | Chemistry, Multidisciplinary | cited 12 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5633 )
  • 2010.05.25
    Abstract:
  • Murray, D. B.; Netting, C. H.; Saviot, L.; Pighini, C.; Millot, N.; Aymes, D. & Liu, H. L.
    | Far-infrared absorption by acoustic phonons in titanium dioxide nanopowders
    | Journal of Nanoelectronics and Optoelectronics, 2006 , 1 , 92-98 , DOI 10.1166/jno.2006.010 | Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied | cited 12 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    We report spectral features of far-infrared electromagnetic radiation absorption in anatase TiO2 nanopowders that we attribute to absorption by acoustic phonon modes of nanoparticles. The frequency of peak excess absorption above the background level corresponds to the predicted frequency of the dipolar acoustic phonon from continuum elastic theory. The intensity of the absorption cannot be accounted for in a continuum elastic dielectric description of the nanoparticle material. Quantum mechanical scale-dependent effects must be considered. The absorption cross section is estimated from a simple mechanical phenomenological model. The results are in plausible agreement with the absorption being due to a sparse layer of charge on the nanoparticle surface.
  • Barbier-Baudry, D.; Bouyer, F.; Bruno, A. S. M. & Visseaux, M.
    | Lanthanide borohydrido complexes for MMA polymerization: syndio- vs iso-stereocontrol
    | Applied Organometallic Chemistry, 2006 , 20 , 24-31 , DOI 10.1002/aoc.1002 | Chemistry, Applied; Chemistry, Inorganic & Nuclear | cited 11 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    This paper presents an extensive study of the polymerization of MMA with borohydrido lanthanide complexes for the first time. Catalytic systems are made from a lanthanide derivative bearing zero one, or two bulky ligands: substituted cyclopentadienyl (Cp*' = C(5)Me(4)nPr, Cp-4i = C(5)HiPr(4), Cp-Ph3 = H2C5Ph3-1,2,4), and/or diketiminate ([(p-tol)NN] = [(p-CH3C6H4)N(CH3)C](2)CH), in the presence of variable quantities of alkylating agent. With BuLi in apolar medium, highly isotactic polymer (up to 95.6%) is formed. In THF, syndiotactic-rich PMMA is obtained whatever the nature of the co-catalyst (BuLi or (MgBu2)-Bu-n). The presence of an electron-withdrawing ligand such as Cp-Ph3 allows high syndioregularity, up to 81.8% at 0 degrees C, together with the highest conversion. There is quite good concordance between calculated and experimental molecular data in THF. Divalent CP*'Sm-2(II)(THF) and (Cp-Ph3)(2)Sm-II(THF) are active as single-component initiators; the former affords PMMA 88% syndiotactic at 0 degrees C. Copyright (c) 2005 John Wiley & Sons, Ltd.
  • Bosio, F. & Meersseman, L.
    | Real quadrics in C-n, complex manifolds and convex polytopes
    | Acta Mathematica, 2006 , 197 , 53-127 , DOI 10.1007/s11511-006-0008-2 | Mathematics | cited 11 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
  • Grapinet, M. & Grelu, P.
    | Vibrating soliton pairs in a mode-locked laser cavity
    | Optics Letters, 2006 , 31 , 2115-2117 | Optics | cited 11 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We show numerically the existence of vibrating soliton pairs that are consistent with observations performed with a passively mode-locked fiber laser. These vibrating pairs are new types of multisoliton complexes that exist in the vicinity of the phase-locked soliton pairs discovered a few years ago [Opt. Lett. 27, 966 (2002)]. The pairs are found numerically with a laser propagation model that includes nonlinear dissipation and cavity periodicity, and they can appear following a Hopf-type bifurcation when a cavity parameter is tuned. (c) 2006 Optical Society of America.
  • Guillot, J.; Chappe, J. M.; Heintz, O.; Martin, N.; Imhoff, L. & Takadoum, J.
    | Phase mixture in MOCVD and reactive sputtering TiOxNy thin films revealed and quantified by XPS factorial analysis
    | Acta Materialia, 2006 , 54 , 3067-3074 , DOI 10.1016/j.actamat.2006.02.042 | Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering | cited 11 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    Titanium oxynitride thin films have been deposited by low-pressure metalorganic chemical vapour deposition and reactive sputtering. The growth temperature for chemical vapour-deposited films and water vapour partial pressure for sputter-deposited films have been used to modulate the chemical composition. Both series have been analysed using X-ray photoelectron spectroscopy (XPS) in order to describe the structure of the materials using a factorial analysis approach. Titanium and metalloid concentrations have also been determined and compared to an elemental analysis performed using Rutherford backscattering spectroscopy and nuclear reaction analysis. The two deposition methods led to the synthesis of TiOxNy coatings exhibiting various oxygen and nitrogen concentrations from metallic TiN to insulating TiO2 compounds. Taking into account the Ti 2p signals of XPS spectra and implementing the factorial analysis, both series exhibited the coexistence of two phases, namely Ti(N,O) and TiO2. Quantification of each phase has been calculated and discussed as a function of the deposition conditions. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
  • Houngniou, C.; Chevalier, S. & Larpin, J. P.
    | High-temperature-oxidation behavior of iron-aluminide diffusion coatings
    | Oxidation of Metals, 2006 , 65 , 409-439 , DOI 10.1007/s11085-006-9033-y | Metallurgy & Metallurgical Engineering | cited 11 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    Aluminide diffusion coatings were oxidized in air under atmospheric pressure under isothermal and cyclic conditions. The high-temperature efficiency of the pack-aluminized alloys was tested by comparing their oxidation behavior in the temperature range 800-1080 degrees C. The k(p) values deduced from the parabolic plots of weight-gain curves showed that alpha-Al2O3 composed the major phase of the oxide scale on samples oxidized at T > 1000 degrees C. For lower temperatures, transient-alumina phases were observed. The aluminide materials also exhibited excellent resistance to cyclic oxidation at 1000 degrees C. The second aim of this study was to dope the aluminide compounds obtained by a pack-cementation process with yttria, which was introduced by metal-organic chemical-vapor deposition (MOCVD). The beneficial effect of the reactive-element-oxide coating is strongly dependent on its mode of introduction, since the oxidation resistance is drastically increased when the Y2O3 coating was applied prior to the aluminization process. When applied after the aluminization, the reactive element gave negative effects on the high-temperature oxidation behavior of the iron aluminides. The oxide morphologies, X-ray diffraction patterns and two-stage experiments helped to understand the oxide-scale-growth mechanisms.
  • Ivanov, V. V.; Hierso, J. C.; Amardeil, R. & Meunier, P.
    | General route to dissymmetric heteroannular-functionalized ferrocenyl 1,2-diphosphines: Selective synthesis and characterization of a new class of tri- and tetrasubstituted ferrocenyl compounds
    | Organometallics, 2006 , 25 , 989-995 , DOI 10.1021/om050882g | Chemistry, Inorganic & Nuclear; Chemistry, Organic | cited 11 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    Several monosubstituted-cyclopentadienyl anions (A-Li) and [1,2-bis(diphenylphosphino)-4-tertbutylcyclopentadienyt] lithium (B-Li) react with FeCl2 to afford a novel class of multidentate ferrocenylphosphines (A-Fe-B). The proposed synthetic method represents a unique means to produce achiral dissymmetric 1,1',2-substituted ferrocenes (A-Fe-B) bearing a heteroannular V-substituent which is different from the homoannular 1- and 2-substituents. The selectivity for the two-step reaction favors formation of the desired dissymmetric product (A-Fe-B) rather than the concurrent formation of the symmetric di-and tetrasubstituted ferrocenes (A-Fe-A and B-Fe-B). Therefore, this method allows access to a great number of dissymmetric multidentate metalloligands, especially when one considers that functionalized-Cp salts continue to expand in terms of number and diversity. Herein, emphasis was placed upon the H-1, C-13, and P-31 NMR characterization of the metalloligands; several examples exhibit intriguing conformational properties and rare "through- space" phosphorus nuclear-spin couplings.
  • Massoubre, D.; Oudar, J. L.; Fatome, J.; Pitois, S.; Millot, G.; Decobert, J. & Landreau, J.
    | All-optical extinction-ratio enhancement of a 160 GHz pulse train by a saturable-absorber vertical microcavity
    | Optics Letters, 2006 , 31 , 537-539 | Optics | cited 11 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    A vertical-access passive all-optical gate has been used to improve the extinction ratio of a 160 GHz pico-second pulse train at 1555 nm. An extinction ratio enhancement of 6 dB is observed within an 8 nm bandwidth. Such a device is a promising candidate for low-cost all optical reamplication and reshaping (211) regeneration at 160 Gbits/s. (c) 2006 Optical Society of America.
  • Medoc, V.; Bollache, L. & Belsel, J. N.
    | Host manipulation of a freshwater crustacean (Gammarus roeseli) by an acanthocephalan parasite (Polymorphus minutus) in a biological invasion context
    | International Journal For Parasitology, 2006 , 36 , 1351-1358 , DOI 10.1016/j.ijpara.2006.07.001 | Parasitology | cited 11 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Several gammarid species serve as intermediate hosts for the acanthocephalan parasite Polymorphus minutus. This parasite influences gammarid behaviour in order to favour transmission to its ultimate host, generally a bird. We investigated this host manipulation in Gammarus roeseli, a gammarid species introduced in France 150 years ago which now coexists with several exotic species from different origins. In the field, vertical distribution of G. roeseli revealed a higher proportion of infected individuals close to the water's surface and the size distribution of infected gammarids revealed predation pressure on infected individuals. However, under laboratory conditions both infected and non-infected individuals remained benthic. The addition of a second gammarid, Dikerogammarus villosus, to the experimental device involved a vertical displacement of infected G. roeseli towards the water's surface. Dikerogammarus villosus, originating from the Ponto-Caspian basin, can be considered as an aggressive predator. The substitution of D. villosus with Atyaephyra desmarestii, a planktivore decapod, did not alter the gammarids' distribution, with both infected and uninfected G. roeseli staying benthic. Thus, biotic interactions between D. villosus and G. roeseli represent selective pressure encouraging the expression of manipulated behaviour in infected amphipods. Through manipulation, P. minutus was found to increase the survival of infected G. roeseli when faced with non-host predators and to make it more vulnerable to predation by the parasite's definitive host. (c) 2006 Australian Society for Parasitology Inc. Published by Elsevier Ltd. All rights reserved.
  • Petit, A.; Richard, P.; Cacelli, I. & Poli, R.
    | A two-state computational investigation of methane C-H and ethane C-C oxidative addition to [CpM(PH3)(n+) (M = Co, Rh, Ir; n=0, 1)
    | Chemistry-a European Journal, 2006 , 12 , 813-823 | Chemistry, Multidisciplinary | cited 11 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    Reductive elimination of methane from methyl hydride half-sandwich phosphane complexes of the Group 9 metals has been investigated by DFT calculations on the model system [CpM(PH3)(CH3)(H)] (M = Co, Rh, Ir). For each metal, the unsaturated product has a triplet ground state; thus, spin crossover occurs during the reaction. All relevant stationary points on the two potential energy surfaces (PES) and the minimum energy crossing point (MECP) were optimized. Spin crossover occurs very near the sigma-CH4 complex local minimum for the Co system, whereas the heavier Rh and Ir systems remain in the singlet state until the CH, molecule is almost completely expelled from the metal coordination sphere. No local sigma-CH4 minimum was found for the Ir system. The energetic profiles agree with the nonexistence of the Co-III methyl hydride complex and with the greater thermal stability of the Ir complex relative to the Rh complex. Reductive elimination of methane from the related oxidized complexes [CpM(PH3)(CH3)(H)](+) (M = Rh, Ir) proceeds entirely on the spin doublet PES, because the 15-electron [CpM(PH3)](+) products have a doublet ground state. This process is thermodynamically favored by about 25 kcal mol(-1) relative to the corresponding neutral system. It is essentially barrierless for the Rh system and has a relatively small barrier (ca.7.5 kcal mol(-1)) for the Ir system. In both cases. the reaction involves a CH4, intermediate. Reductive elimination of ethane from [CpM(PH3)(CH3)(2)](+) (M = Rh, Ir) shows a similar thermodynamic profile, but is kinetically quite different from methane elimination from [CpM(PH3)(CH3)(H)](+): the reductive elimination barrier is much greater and does not involve a sigma-complex intermediate. The large difference in the calculated activation barriers (ca. 12.0 and ca. 30.5 kcal mol(-1) for the Rh and Ir systems, respectively) agrees with the experimental observation, for related systems, of oxidatively induced ethane elimination when M = Rh, whereas the related Ir systems prefer to decompose by alternative pathways.
  • Hasnaoui, A.; Politano, O.; Salazar, J. M. & Aral, G.
    | Nanoscale oxide growth on Al single crystals at low temperatures: Variable charge molecular dynamics simulations
    | Physical Review B, 2006 , 73 , 035427 , DOI 10.1103/PhysRevB.73.035427 | Physics, Condensed Matter | cited 10 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    We investigate the oxidation of aluminum low-index surfaces [(100), (110), and (111)] at low temperatures (300-600 K) and three different gas pressure values. We use molecular dynamics (MD) simulations with dynamic charge transfer between atoms where the interaction between atoms is described by the Es+ potential composed of the embedded atom method (EAM) potential and an electrostatic contribution. In the considered temperature range and under different gas pressure conditions, the growth kinetics follow a direct logarithmic law where the oxide thickness is limited to a value of similar to 3 nm. The fitted curves allow us to determine the temperature and the pressure dependencies of the parameters involved in the growth law. During the adsorption stage, we observe a rotation of the oxygen pair as a precursor process to its dissociation. In most cases, the rotation aligns the molecule vertically to the Al surface. The separation distance after dissociation ranges from 3 to 9 A. Atomistic observations revealed that the oxide presents a dominant tetrahedral (AlO4) environment in the inner layer and mixed tetrahedral and octahedral (AlO6) environments in the outer oxide region when the oxide thickness reaches values beyond similar to 2 nm.
  • Hierso, J. C.; Picquet, M.; Cattey, H. & Meunier, P.
    | Palladium-catalysed Heck alkynylation of aryl bromides in an imidazolium ionic liquid: An unexpected subsequent alkyne hydrogenation reaction
    | Synlett, 2006 , 3005-3008 , DOI 10.1055/s-2006-951503 | Chemistry, Organic | cited 10 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    The copper-free palladium-catalysed alkynylation of aryl bromides with phenylacetylene in the imidazolium ionic liquid [BMIM][BF4], in the presence of triphenylphosphine ligand and pyrrolidine as a base, was found effective and significantly more chemoselective employing deactivated substrates. When activated aryl substrates were used, unexpected side reactions were observed, especially the subsequent hydrogenation of the alkyne function in some coupling products. In other cases, amine arylation reactions occurred, as illustrated by the formation of pyrr olidinyl-4-nitrobenzene, for which an X-ray diffraction structure is reported.
  • Labbez, C.; Jonsson, B.; Pochard, I.; Nonat, A. & Cabane, B.
    | Surface charge density and electrokinetic potential of highly charged minerals: Experiments and Monte Carlo simulations on calcium silicate hydrate
    | Journal of Physical Chemistry B, 2006 , 110 , 9219-9230 , DOI 10.1021/jp057096+ | Chemistry, Physical | cited 10 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    In this paper, we are concerned with the charging and electrokinetic behavior of colloidal particles exhibiting a high surface charge in the alkaline pH range. For such particles, a theoretical approach has been developed in the framework of the primitive model. The charging and electrokinetic behavior of the particles are determined by the use of a Monte Carlo simulation in a grand canonical ensemble and compared with those obtained through the mean field theory. One of the most common colloidal particles has been chosen to test our theoretical approach. That is calcium silicate hydrate (C-S-H) which is the main component of hydrated cement and is known for being responsible for cement cohesion partly due to its unusually high surface charge density. Various experimental techniques have been used to determine its surface charge and electrokinetic potential. The experimental and simulated results are in excellent agreement over a wide range of electrostatic coupling, from a weakly charged surface in contact with a reservoir containing monovalent ions to a highly charged one in contact with a reservoir with divalent ions. The electrophoretic measurements show a charge reversal of the C-S-H particles at high pH and/or high calcium concentration in excellent agreement with simulation predictions. Finally, both simulation and experimental results clearly demonstrate that the mean field theory fails not only quantitatively but also qualitatively to describe a C-S-H dispersion under realistic conditions.
  • Loriot, V.; Hertz, E.; Rouzee, A.; Sinardet, B.; Lavorel, B. & Faucher, O.
    | Strong-field molecular ionization: determination of ionization probabilities calibrated with field-free alignment
    | Optics Letters, 2006 , 31 , 2897-2899 | Optics | cited 10 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We report an original optical method providing the probability of molecular ionization induced by femtosecand laser pulses. The approach consists of exploiting molecular alignment to extract reliable information about ionization. The cross defocusing technique implemented for this purpose reveals a sensitivity with respect to postpulse alignment, as well as to the free electron density induced by the ultrashort laser pulse. The analysis of the resulting signal thus gives access to absolute single-ionization probabilities calibrated through the degree of alignment, provided that free electrons are produced mainly by single ionization. The relevance of the method is assessed in N-2. (c) 2006 Optical Society of America.
  • Mathey, P.; Grapinet, M.; Jauslin, H. R.; Sturman, B.; Rytz, D. & Odoulov, S.
    | Threshold behavior of semi-linear photorefractive oscillator
    | European Physical Journal D, 2006 , 39 , 445-451 , DOI 10.1140/epjd/e2006-00127-x | Physics, Atomic, Molecular & Chemical | cited 10 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    A general analysis of the threshold behavior for the photorefractive semi-linear oscillator is performed within the linear approximation on the basis of the classical wave-coupling model. This analysis shows that the well known particular results on the frequency degenerate oscillation are valid only within a restricted range of the external parameters. The theory specifies the conditions for onset and properties of the frequency non-degenerate oscillations, including the necessary values of the coupling strength, pump intensity ratio, the increments of the instability, and the frequency splits. Important generalizations of the basic model are considered.
  • Sugny, D.; Kontz, C. & Jauslin, H. R.
    | Target states and control of molecular alignment in a dissipative medium
    | Physical Review A, 2006 , 74 , 053411 , DOI 10.1103/PhysRevA.74.053411 | Optics; Physics, Atomic, Molecular & Chemical | cited 10 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We investigate how and to what extent molecular alignment can be controlled in a dissipative medium by a suitable train of laser pulses. We focus primarily on the extension of a scheme of control originally constructed for unitary evolution. The procedure is applied to control the alignment of CO molecules in an Ar gas. The parameters of the train of kicks-i.e., the intensity of each kick and the delay between them-are either obtained by a systematic procedure (maximum strategy) or by optimization by evolutionary algorithms.
  • Tillmann, B.; Bigand, E.; Escoffier, N. & Lalitte, P.
    | The influence of musical relatedness on timbre discrimination
    | European Journal of Cognitive Psychology, 2006 , 18 , 343-358 | Psychology, Experimental | cited 10 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    Musical priming research has reported that sensory consonance/dissonance judgements for a target chord were faster when targets were musically related to a musical prime context. The present study extended this context effect to a timbre discrimination task. This new task allowed us to investigate whether musical priming results from congruency effects similar to those reported in other domains. Targets were played with two musical timbres and were either strongly related (i.e., tonic chord) or less related (i.e., subdominant chord) to the prime context. In three experiments, timbre discrimination judgements were always faster for related targets than for less-related targets. This finding establishes that musical relatedness influences the processing of timbres and suggests that this priming effect does not derive from response biases due to congruency effects. Using a timbre discrimination task in musical priming studies offers other methodological advantages and controls, which are discussed in the final section.
  • Tougard, C. & Montuire, S.
    | Pleistocene paleoenvironmental reconstructions and mammalian evolution in South-East Asia: focus on fossil faunas from Thailand
    | Quaternary Science Reviews, 2006 , 25 , 126-141 , DOI 10.1016/j.quascirev.2005.04.010 | Geography, Physical; Geosciences, Multidisciplinary | cited 10 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Mammalian faunal studies have provided various clues for a better reconstruction of hominid Quaternary paleoenvironments. In this work, two methods were used: (1) the cenogram method, based on a graphical representation of the mammalian community structure, and (2) the species richness of murine rodents to estimate climatic parameters. These methods were applied to Middle and Late Pleistocene mammalian faunas of South-East Asia, from South China to Indonesia. Special emphasis was laid on a fauna from north-east Thailand dated back to approximately 170,000 years (i.e. a glacial period). This Thai fauna seems characteristic of a slightly open forested environment intermediate between those of present-day central Myanmar and the northern part of South China. In the Thai fauna, the occurrence of both cool-loving mammalian taxa, currently living further north, and species of larger body size than their living counterparts, indicates cooler and probably drier climatic conditions than present-day climates in Thailand. These results are quite consistent with Middle Pleistocene palynological records from South China and eastern Java. From other less well-documented Pleistocene faunas, taken into account in this work, humid climatic conditions of interglacial periods were revealed from large mammalian taxa. (c) 2005 Elsevier Ltd. All rights reserved.
  • Tran, H.; Flaud, P. M.; Gabard, T.; Hase, F.; von Clarmann, T.; Camy-Peyret, C.; Payan, S. & Hartmann, J. M.
    | Model, software and database for line-mixing effects in the nu(3) and nu(4) bands of CH4 and tests using laboratory and planetary measurements - I: N-2 (and air) broadenings and the earth atmosphere
    | Journal of Quantitative Spectroscopy & Radiative Transfer, 2006 , 101 , 284-305 , DOI 10.1016/j.jqsrt.2005.11.020 | Spectroscopy | cited 10 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    Absorption spectra of the infrared nu(3) and nu(4) bands of CH4 perturbed by N-2 over large ranges of pressure and temperature have been measured in the laboratory. A theoretical approach accounting for line mixing is proposed to (successfully) model these experiments. It is similar to that of Pieroni et al. [J Chem Phys 1999; 110:7717-32] and is based on state-to-state rotational cross-sections calculated with a semi-classical approach and a few empirical parameters. The latter, which enable switching from the state space to the line space, are deduced from a fit of a single room temperature spectrum of the nu(3) band at 50 atm. The comparisons between numerous measured and calculated spectra under a vast variety of conditions (nu(3) and nu(4), 0-500 atm, 170-300 K) then demonstrate the quality and consistency of the proposed model. This success is a first validation of a database and associated software built in order to model the shape of CH4 absorption in air, that are available and suitable for the updating of atmospheric radiative transfer codes. The accuracy of these tools is then further demonstrated using transmission measurements of the Earth atmosphere in the nu(3) region (3 mu m) recorded in solar absorption with ground and balloon based Fourier transform instruments. Similar tests in the nu(4) region using satellite based emission spectra and ground-based transmission measurements confirm the model quality although they show very small line-mixing effects and their masking by strong contributions of other species. (C) 2005 Elsevier Ltd. All rights reserved.
  • Wabnitz, S.
    | Broadband parametric amplification in photonic crystal fibers with two zero-dispersion wavelengths
    | Journal of Lightwave Technology, 2006 , 24 , 1732-1738 , DOI 10.1109/JLT.2006.871068 | Engineering, Electrical & Electronic; Optics | cited 10 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    In this paper, the fourfold parametric enhancement over Raman gain of the total optical fiber-amplifier gain is analyzed. Such fiber-amplifier gain may be obtained with a relatively flat profile over a bandwidth in excess of 70 nm by using a microstructure or photonic crystal fiber with two zero-dispersion wavelengths. Optimal fiber-amplifier gain enhancement occurs whenever the pump wavelength is slightly shorter than the second zero-dispersion wavelength of a microstructure optical fiber.
  • Brygo, F.; Semerok, A.; Oltra, R.; Weulersse, J. M. & Fomichev, S.
    | Laser heating and ablation at high repetition rate in thermal confinement regime
    | Applied Surface Science, 2006 , 252 , 8314-8318 , DOI 10.1016/j.apsusc.2005.11.036 | Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter | cited 9 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    Laser heating and ablation of materials with low absorption and thermal conductivity (paint and cement) were under experimental and theoretical investigations. The experiments were made with a high repetition rate Q-switched Nd:YAG laser (10 kHz, 90 ns pulse duration and lambda = 532 nm). High repetition rate laser heating resulted in pulse per pulse heat accumulation. A theoretical model of laser heating was developed and demonstrated a good agreement between the experimental temperatures measured with the infrared pyrometer and the calculated ones. With the fixed wavelength and laser pulse duration, the ablation threshold fluence of paint was found to depend on the repetition rate and the number of applied pulses. With a high repetition rate, the threshold fluence decreased significantly when the number of applied pulses was increasing. The experimentally obtained thresholds were well described by the developed theoretical model. Some specific features of paint heating and ablation with high repetition rate lasers are discussed. (c) 2005 Elsevier B.V. All rights reserved.
  • Dito, G. & Turrubiates, F. J.
    | The damped harmonic oscillator in deformation quantization
    | Physics Letters A, 2006 , 352 , 309-316 , DOI 10.1016/j.physleta.2005.12.013 | Physics, Multidisciplinary | cited 9 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    We propose a new approach to the quantization of the damped harmonic oscillator in the framework of deformation quantization. The quantization is performed in the Schrodinger picture by a star-product induced by a modified "Poisson bracket". We determine the eigenstates in the damped regime and compute the transition probability between states of the undamped harmonic oscillator after the system was submitted to dissipation. (c) 2005 Elsevier B.V. All rights reserved.
  • Drezet, A.; Stepanov, A. L.; Hohenau, A.; Steinberger, B.; Galler, N.; Ditlbacher, H.; Leitner, A.; Aussenegg, F. R.; Krenn, J. R.; Gonzalez, M. U. & Weeber, J. C.
    | Surface plasmon interference fringes in back-reflection
    | Europhysics Letters, 2006 , 74 , 693-698 , DOI 10.1209/epl/i2006-10027-7 | Physics, Multidisciplinary | cited 9 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We report the experimental observation of surface plasmon polariton (SPP) interference fringes with near-unity visibility and half-wavelength periodicity obtained in back reflection on a Bragg mirror. The presented method based on leakage radiation microscopy (LRM) represents an alternative solution to optical near-field analysis and opens new ways for the quantitative analysis of SPP fringes. With LRM we investigate various SPP interference patterns and analyze the high reflectivity of Bragg mirror in comparison with theoretical models.
  • Fatome, J.; Pitois, S. & Millot, G.
    | Measurement of nonlinear and chromatic dispersion parameters of optical fibers using modulation instability
    | Optical Fiber Technology, 2006 , 12 , 243-250 , DOI 10.1016/j.yofte.2005.07.005 | Engineering, Electrical & Electronic; Optics; Telecommunications | cited 9 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We present a simple method for the measurement of Kerr, second- and third-order dispersion coefficients in optical fibers using power and dispersion dependences of modulation instability near the zero-dispersion wavelength. We also complete the analysis by the accurate determination of the zero-dispersion wavelength of the fiber using the phase-matched four wave mixing process which occurs near this specific wavelength. (C) 2005 Elsevier Inc. All rights reserved.
  • Lacour, X.; Guerin, S.; Vitanov, N. V.; Yatsenko, L. P. & Jauslin, H. R.
    | Implementation of single-qubit quantum gates by adiabatic passage and static laser phases
    | Optics Communications, 2006 , 264 , 362-367 , DOI 10.1016/j.optcom.2006.01.059 | Optics | cited 9 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We propose and analyse experimentally feasible implementations of single-qubit quantum gates based on stimulated Raman adiabatic passage (STIRAP) between magnetic sublevels in atoms coupled by elliptically polarized pulsed laser fields, in part based on a proposal by Kis and Renzoni [Z. Kis, F. Renzoni, Phys. Rev. A 65 (2002) 032318]. These techniques require only the control of the relative phase of the driving fields but do not involve any dynamical or geometric phases, which makes it independent of the other interaction details: detuning, pulse shapes, pulse areas and pulse durations. The suggested techniques are immune to spontaneous emission since the qubit manipulation proceeds through non-absorbing dark states. We also propose an alternative technique using compensation of dynamical Stark shifts by two consecutive non-resonant fractional-STIRAP processes. (c) 2006 Elsevier B.V. All rights reserved.
  • Lasbleiz, C.; Ferveur, J. F. & Everaerts, C.
    | Courtship behaviour of Drosophila melanogaster revisited
    | Animal Behaviour, 2006 , 72 , 1001-1012 , DOI 10.1016/j.anbehav.2006.01.027 | Behavioral Sciences; Zoology | cited 9 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5548 )
  • 2010.05.25
    Abstract:
    Nearly all studies of Drosophila melanogaster courtship have focused exclusively on male behaviour. Female precopulatory behaviour is often relegated to 'accept' or 'reject' mating, and how female behaviour interacts with that of males remains largely unknown. Using a video-computing approach, we measured 10 behavioural states and 22 elementary behaviours that occur during the precopulatory phase of Canton-S (Cs) flies. Male and female behaviours were studied under a variety of social conditions. This allowed us to identify which one(s) is relevant to courtship or to general activity. Our analysis showed that the courtship repertoire was not constant over time, as female and male behaviours varied during courtship, and that virgin Cs females showed several behavioural sequences whose frequency, latency and total duration could predict their mating success. The most striking index of females' willingness to copulate was the way they extruded the ovipositor: a partial extrusion stimulated male courtship, whereas total extrusion inhibited it. Furthermore, females that mated preened their abdomen more frequently than did females that did not mate. We also observed that male sexual activity was strongly increased when the female emitted a tiny volatile droplet at the tip of the ovipositor. We hypothesized that partial ovipositor extrusion, droplet emission and abdominal preening are related behaviours that result in the active dispersion of compounds spread on the female's abdomen. Such a detailed picture of the precopulatory behaviours should allow better characterization of the sensory stimuli exchanged during courtship in Drosophila. (c) 2006 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.
  • Schnyder, J.; Ruffell, A.; Deconinck, J. F. & Baudin, F.
    | Conjunctive use of spectral gamma-ray logs and clay mineralogy in defining late Jurassic-early Cretaceous palaeoclimate change (Dorset, UK)
    | Palaeogeography Palaeoclimatology Palaeoecology, 2006 , 229 , 303-320 , DOI 10.1016/j.palaeo.2005.06.027 | Geography, Physical; Geosciences, Multidisciplinary; Paleontology | cited 9 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Detrital clay mineralogy is controlled by weathered source rock, climate, transport and deposition that in turn influence the spectral gamma-ray (SGR) response of resultant sediments. Whilst a palaeoclimate signal in clay mineralogy has been established in some ancient successions, the SGR response remains contentious, largely because the data sets have yet to be collected at the same or appropriate vertical scales to allow comparison. In addition, the influence of organic matter on SGR is not always considered. Here, we present clay mineralogical, total organic carbon (TOC) and SGR analyses from the late Jurassic and early Cretaceous of the Wessex Basin, a period of previously documented palaeoclimate change. The aim of this paper is to estimate the sensitivity of SGR as palaeoclimatic tool, SGR and clay mineral data having been collected at the same sample points, making this one of the most rigorous comparison of clay mineral and SGR to date. Overall, the correlation between high thorium/potassium or thorium/uranium and kaolinite associated with a well-established palaeoclimate change shows that elevated thorium may be used as a proxy for humid palaeoweathering, as suggested by few previous studies. (c) 2005 Elsevier B.V. All rights reserved.
  • Trulsson, M.; Jonsson, B.; Akesson, T. & Forsman, J.
    | Repulsion between oppositely charged surfaces in multivalent electrolytes
    | Physical Review Letters, 2006 , 97 , 068302 , DOI 10.1103/PhysRevLett.97.068302 | Physics, Multidisciplinary | cited 9 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    In answer to recent experimental force measurements between oppositely charged surfaces we here reproduce the repulsion in the presence of multivalent salt using Monte Carlo simulations within the primitive model. Our osmotic pressure curves are in good agreement with experimental results. In contrast with Poisson-Boltzmann calculations, both repulsion and charge inversion are seen in the simulations. Repulsion is observed only for conditions under which there is charge inversion at large separations. However, in these cases, the repulsion is present also at intermediate separations, where there is no charge inversion. The charge inversion is thereby not the cause of the repulsion. Instead the repulsion appears to be an effect of the large amount of excess salt in the slit. Both phenomena, however, are closely linked and a consequence of ion-ion correlations, promoted by a strong electrostatic coupling.
  • Evrard, D.; Clement, S.; Lucas, D.; Hanquet, B.; Knorr, M.; Strohmann, C.; Decken, A.; Mugnier, Y. & Harvey, P. D.
    | Chemistry and electrochemistry of the heterodinuclear complex ClPd(dppm)(2)PtCl: A M-M ' bond providing site selectivity
    | Inorganic Chemistry, 2006 , 45 , 1305-1315 , DOI 10.1021/ic051102z | Chemistry, Inorganic & Nuclear | cited 8 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    The heterodinuclear d(9)-d(9) title compound 1, whose crystal structure has been solved, reacts with dppm [bis(diphenylphosphino)methane] in the presence of NaBF4 to generate the salt [ClPd(mu-dPPM)(2)Pt(eta(1)-dppm)][BF4] (2a), which contains a Pt-bound dangling dppm ligand. 2a has been characterized by H-1 and P-31 NMR, Fourier transform Raman [v(Pd-Pt) = 138 cm(-1)], and UV-vis spectroscopy [lambda(max)(d sigma-d sigma*) = 366 nm]. In a similar manner, [ClPd(mu-dppm)(2)Pt(eta(1)-dppm=O)][BF4] (2b), ligated with a dangling phosphine oxide, has been prepared by the addition of dppm=O. The molecular structure of 2b has been established by an X-ray diffraction study. 2a reacts with 1 equiv of NaBH4 to form the platinum hydride complex [(eta(1)-dppm)Pd(mu-dppm)(2)Pt(H)][BF4] (3). Both 2a and 3 react with an excess of NaBH4 to provide the mixed-metal d(10)-d(10) compound [Pd(mu-dppm)(3)Pt] (4). The photophysical properties of 4 were studied by UV-vis spectroscopy [lambda(max)(d sigma-d sigma*) = 460 nm] and luminescence spectroscopy (lambda(emi) = 724 nm; tau(e) = 12 +/- 1 mu s, 77 K). The protonation of 1 and 4 leads to [ClPd(mu-dppm)(2)(mu-H)PtCl](+) (5) and 3, respectively. Stoichiometric treatment of 1 with cyclohexyl or xylyl isocyanide yields [CIPd(mu-dppm)(2)Pt(CNC6H11)]Cl (6a) and [ClPd(mu-dppm)(2)Pt(CN-xylyl)]Cl (6b) ligated by terminal-bound CNR ligands. In contrast, treatment of 1 with the phosphonium salt [C&3bond; NCH2PPh3]Cl affords the structurally characterized A-frame compound [ClPd(mu-dppm)(2)(mu-C=NCH2PPh3)PtCl]Cl (6c), spanned by a bridging isocyanide ligand. The electrochemical reduction of 2a at -1.2 V vs SCE, as well as the reduction of 5 in the presence of dppm, leads to a mixture of products 3 and 4. Further reduction of 3 at -1.7 V vs SCE generates 4 quantitatively. The reoxidation at 0 V of 4 in the presence of Cl- ions produces back complex 2a. The whole mechanism of the reduction of 1 has been established.
  • Krawiec, H.; Vignal, V.; Heintz, O.; Oltra, R. & Chauveau, E.
    | Dissolution of chromium-enriched inclusions and pitting corrosion of resulfurized stainless steels
    | Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2006 , 37A , 1541-1549 | Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering | cited 8 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    The dissolution of MnS inclusions enriched in chromium (30 to 40 wt pct Cr) and the corrosion susceptibility of resulfurized stainless steel were studied in various NaCl- and NaClO4-based solutions by X-ray photoelectron spectroscopy, secondary ion mass spectroscopy, scanning electron microscopy (SEM), and the electrochemical microcell technique. It has been shown that chromium-enriched inclusions do not undergo dissolution under free corrosion conditions. By contrast, electrochemical dissolution of inclusions occurs at high potential values (above 500 mV vs saturated calomel electrode) in all the solutions, followed by stable pitting. It has also been shown that some areas containing chromium-enriched inclusions exhibited stable pitting at low potentials (below 100 mV vs saturated calomel electrode) in the electrolytes with chloride ions. Field-emission SEM experiments have revealed that the matrix undergoes dissolution around these inclusions. An assumption is proposed for describing pitting corrosion mechanisms.
  • Krawiec, H.; Vignal, V.; Heintz, O. & Oltra, R.
    | Influence of the dissolution of MnS inclusions under free corrosion and potentiostatic conditions on the composition of passive films and the electrochemical behaviour of stainless steels
    | Electrochimica Acta, 2006 , 51 , 3235-3243 , DOI 10.1016/j.electacta.2005.09.015 | Electrochemistry | cited 8 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    The influence of the dissolution of MnS inclusions at the OCP value and 400 mV versus SCE on the chemical composition of passive films and the electrochemical behaviour of resulfurized austenitic stainless steel was studied in 1 M NaClO4, pH 3, solution using SIMS, XPS, electrochemical impedance spectroscopy and the electrochemical microcell technique. The electrochemical dissolution (at 400 mV versus SCE) of inclusions occurred uniformly along the interface and this process was almost complete after 25 min immersion. A small amount of sulfur was detected on the matrix that exhibited a wide passive range. By contrast, the dissolution process under free corrosion was not uniform along the interface and numerous inclusions were partly dissolved. Grains close to the completely dissolved inclusions showed an active behaviour. This was connected with the adsorption of a large number of sulfur on the surface. In the two cases, the presence of sulfur species on the surface was also found to enhance the kinetics of cathodic reactions. (c) 2005 Elsevier Ltd. All rights reserved.
  • Li, H.; Costil, S.; Barnier, V.; Oltra, R.; Heintz, O. & Coddet, C.
    | Surface modifications induced by nanosecond pulsed Nd : YAG laser irradiation of metallic substrates
    | Surface & Coatings Technology, 2006 , 201 , 1383-1392 , DOI 10.1016/j.surfcoat.2006.02.012 | Materials Science, Coatings & Films; Physics, Applied | cited 8 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    Substrate surface preparation is a key step in coating deposition process. In recent years, pulsed laser cleaning has emerged as a possible technique to challenge the traditional preparation methods (based on degreasing and eventually grit-blasting). The laser operated at short-pulse mode offers high cleaning efficiency and therefore has been largely used. In a specific process named PROTAL((R)), a nanosecond pulsed laser is introduced to prepare the surface simultaneously to thermal spraying, with the purpose of eliminating the contaminants and generating favorite surface conditions for coating deposition. This study aims at clarifying some fundamental aspects of nanosecond pulsed Nd:YAG laser irradiation effects on metallic substrates. Both morphological and chemical surface modifications of titanium alloy as well as aluminum alloys were investigated by optical and scanning electron microscopy, roughness measurements and SIMS. The formation of dispersed craters, which is due to the preferential laser ablation on the superficial defects, dominates the surface modifications. This phenomenon becomes more pronounced when increasing the laser energy density or laser pulse numbers. It presents a significant influence on the roughness of polished surface. For titanium alloy, surface oxidation takes place during the laser irradiation in ambient atmosphere, which smoothes the surface. (c) 2006 Elsevier B.V. All rights reserved.
  • Mata, I.; Espinosa, E.; Molins, E.; Veintemillas, S.; Maniukiewicz, W.; Lecomte, C.; Cousson, A. & Paulus, W.
    | Contributions to the application of the transferability principle and the multipolar modeling of H atoms: electron-density study of L-histidinium dihydrogen orthophosphate orthophosphoric acid. I
    | Acta Crystallographica Section A, 2006 , 62 , 365-378 , DOI 10.1107/S0108767306025141 | Crystallography | cited 8 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5633 )
  • 2010.05.25
    Abstract:
    The electron density of L-histidinium dihydrogen orthophosphate orthophos-phoric acid has been determined from X-ray and neutron diffraction data at low temperature (120 K). Topological analysis of the electron density has been used to analyse the effect of the multipolar refinement strategy on the electron-density model in the hydrogen-bonding regions. The electron density at low temperature has also been used to acquire high-quality experimental thermal parameters at room temperature using the transferability principle. Molecular vibrations, TLS and normal mode analysis are discussed and studied at both temperatures.
  • Melkemi, K. E.; Batouche, M. & Foufou, S.
    | A multiagent system approach for image segmentation using genetic algorithms and extremal optimization heuristics
    | Pattern Recognition Letters, 2006 , 27 , 1230-1238 , DOI 10.1016/j.patrec.2005.07.021 | Computer Science, Artificial Intelligence | cited 8 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    We propose a new distributed image segmentation algorithm structured as a multiagent system composed of a set of segmentation agents and a coordinator agent. Starting from its own initial image, each segmentation agent performs the iterated conditional modes method, known as ICM, in applications based on Markov random fields, to obtain a sub-optimal segmented image. The coordinator agent diversifies the initial images using the genetic crossover and mutation operators along with the extrernal optimization local search. This combination increases the efficiency of our algorithm and ensures its convergence to an optimal segmentation as it is shown through some experimental results. (c) 2005 Elsevier B.V. All rights reserved.
  • Nguyen, D. H.; Urrutigoity, M.; Fihri, A.; Hierso, J. C.; Meunier, P. & Kalck, P.
    | Efficient palladium-ferrocenylphosphine catalytic systems for allylic amination of monoterpene derivatives
    | Applied Organometallic Chemistry, 2006 , 20 , 845-850 , DOI 10.1002/aoc.1130 | Chemistry, Applied; Chemistry, Inorganic & Nuclear | cited 8 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    Ferrocenylphosphines added to [Pd(mu-Cl)(eta(3)-C3H5)](2) dimeric precursor produce efficient catalysts to effect the allylic amination of terpenic allylacetates. Particularly convenient are tetrakis(diphenylphosphino)ferrocene and 1,1'-bis(diphenylphosphino)ferrocene, which allow the amination of allylacetates with good to excellent selectivity, and have turnover numbers as high as 80 000, for instance, for the formation of allylaniline. Herein, we report on reactions that selectively transform geranylacetate, nerylacetate, linalylacetate and perillylacetate into the corresponding allylic amines. These preparative methods give facile access to various products of great potential industrial interest. Copyright (c) 2006 John Wiley & Sons, Ltd.
  • Pellenard, P. & Deconinck, J. F.
    | Mineralogical variability of Callovo-Oxfordian clays from the Paris Basin and the Subalpine Basin
    | Comptes Rendus Geoscience, 2006 , 338 , 854-866 , DOI 10.1016/j.crte.2006.05.008 | Geosciences, Multidisciplinary | cited 8 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    High-resolution clay mineralogical data at the Middle/Upper Jurassic boundary from the French Subalpine Basin, the Jura Mountains and the Paris Basin (ANDRA boreholes) from Callovo-Oxfordian clayey deposits allow spatial and temporal terrigenous flux evolution to be considered over a period of 6 to 7 Myr. Recorded diachronisms of major mineralogical changes and complex clays distribution at the Paris Basin scale result to combined pal aeogeographic/eustatic variations and climate input. In the French Subalpine Basin, mineralogical homogeneity confirms the burial diagenesis influence, but other terrigenous supplies must be involved in contrast to the Paris Basin domains. Volcanogenic clays (bentonites) recorded in the two basins reflect paroxysmal explosive volcanic events allowing high resolution correlations to be made and to define active volcanic sources for the Jurassic.
  • Preat, A.; Morano, S.; Loreau, J. P.; Durlet, C. & Mamet, B.
    | Petrography and biosedimentology of the Rosso Ammonitico Veronese (middle-upper jurassic, north-eastern Italy)
    | Facies, 2006 , 52 , 265-278 , DOI 10.1007/s10347-005-0032-2 | Geology; Paleontology | cited 8 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    A petrographic and biosedimentological study of the Rosso Ammonitico Veronese from the Trento Plateau (north-eastern Italy) shows that diagenetic (neomorphism, recrystallization) and biological processes (microbial content and pigmentation) influenced the formation and alteration of the carbonate matrix. The subject of this article is the interaction of early diagenetic processes and an attempt to explain the different colors of the matrix (red, pink, grey). Nearly 200 samples derived from 14 sections (Callovian to Tithonian) located in the Verona area have been studied by means of classical, cathodoluminescence and SEM microscopy. Calcite and ferruginous microfilaments of different shapes and sizes are present and tentatively attributed to fungi and iron bacteria. These micro-organisms precipitated iron oxy-hydroxides at poorly dysoxic-anoxic sediment-water interfaces. Further liberation of submicronic hydroxides (now hematite) was responsible for the red pigmentation of the carbonate matrices, originally composed of less than 1 mu m-sized micrite. Controversial smaller nanograins (0.1-0.5 mu m) attributed to nanobacteria or planktonic picoeukaryotes have been observed in the reddish samples. Recrystallization of the micrite leads to the formation of new micritic crystals, between 2 and 4 mu m in size, then to microspar crystals. Micritic textures are linked to the different colours of the samples. The intensity of the red colour is correlated with the presence of hematite (former iron hydroxides) and the presence of planar subhedral micritic grains. In contrast, pink and greyish samples are linked to the increasingly coalescent structure of anhedral micritic and microsparitic crystals.
  • Scheifler, R.; Coeurdassier, M.; Morilhat, C.; Bernard, N.; Faivre, B.; Flicoteaux, P.; Giraudoux, P.; Noel, M.; Piotte, P.; Rieffel, D.; de Vaufleury, A. & Badot, P. M.
    | Lead concentrations in feathers and blood of common blackbirds (Turdus merula) and in earthworms inhabiting unpolluted and moderately polluted urban areas
    | Science of the Total Environment, 2006 , 371 , 197-205 , DOI 10.1016/j.scitotenv.2006.09.011 | Environmental Sciences | cited 8 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Despite the dramatic decrease of atmospheric lead (Pb) concentrations in urban areas of most industrialised countries, we hypothesised that urban common blackbirds (Turdus merula) may still be contaminated by Pb concentrations of toxicological concern due to transfer from soil through the food chain. We sampled blackbirds and earthworms, one of their main preys, in Besanqon, a middle-size city of Eastern France (where atmospheric Pb concentrations decreased from 0.5 mu g/m(3) in 1987 to nearly 0 in 2002) and in a rural reference site. Lead concentrations were determined in the tissues of the different functional groups of earthworms (anecic, epigeous and endogeous) and in blood, washed and unwashed outermost tail feathers and breast feathers of blackbirds. Fresh masses and an index of individual body condition were measured in the two blackbird populations as biomarkers of possible toxic effects. Lead concentrations in earthworms did not differ among functional groups but were significantly higher in urban individuals than in rural ones. Concentrations in outermost tail feathers, breast feathers and blood were significantly higher in urban blackbirds (7.75 +/- 4.50, 3.15 +/- 1.77 and 0.15 +/- 0.09 mu g/g, respectively) than in rural individuals. In urban blackbirds, concentrations in washed and unwashed outermost tail feathers allowed estimating the external contamination (probably due to deposition of dusts and/or to excretion of the uropygial gland) at 37% of the total Pb concentration of the unwashed feathers. Remaining 63% should be linked to food chain transfer of persistent Pb from urban soils. Among the 23 sampled blackbirds, 4 of them (3 in the urban site and I in the rural site) exhibited blood Pb concentrations higher than the benchmark value (0.20 mu g/g) related to subclinical and physiological effects in birds. Variations in body condition index were not correlated to Pb concentrations in blackbird tissues. Present results suggest that Pb may still be of environmental concern for blackbirds in urban areas because of the persistence of Pb in soils and its transfer through the food chain. (c) 2006 Elsevier B.V. All rights reserved.
  • Seleshi, Y. & Camberlin, P.
    | Recent changes in dry spell and extreme rainfall events in Ethiopia
    | Theoretical and Applied Climatology, 2006 , 83 , 181-191 , DOI 10.1007/s00704-005-0134-3 | Meteorology & Atmospheric Sciences | cited 8 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : FRE2740 )
  • 2010.05.25
    Abstract:
    This paper assesses recent changes in extremes of seasonal rainfall in Ethiopia based on daily rainfall data for 11 key stations over the period 1965-2002. The seasons considered are Kiremt ('main rains', June-September) and Belg ('small rains', February/March-May). The Mann-Kendall and linear regression trend tests show decreasing trends in the Kiremt and the Belg extreme intensity and maximum consecutive 5-day rains over eastern, southwestern and southern parts of Ethiopia whereas no trends are found in the remaining part of Ethiopia. In general, no trends are found in the yearly maximum length of Kiremt and Belg dry spells (days with rainfall below 1 mm) over Ethiopia.
  • Andrieu, J.; Camus, J. M.; Balan, C. & Poli, R.
    | Amino-phosphanes in RHI-catalyzed hydroformylation: New mechanistic insights using D2O as deuterium-labeling agent
    | European Journal of Inorganic Chemistry, 2006 , 62-68 , DOI 10.1002/ejic.200500448 | Chemistry, Inorganic & Nuclear | cited 7 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    In previous work, we have demonstrated that the dangling amino group in amino-phosphane ligands increases the rate of Rh-catalyzed styrene hydroformylation as a function of the amino group basicity and of the distance between the P and N functions. We now report additional stereochemical and mechanistic insights resulting from new catalytic experiments performed with Rh-alpha-PN catalytic systems in the presence of D2O. In addition to the expected Do product, the formation of the P-D, aldehyde, PhCH(CH2D)CHO was observed in all cases by H-1 and C-13 NMR spectroscopy, indicating that H/D exchange occurs for the rhodium-hydride complex. Minor amounts of a beta-D-2 product, PhCH(CHD2)CHO, were also formed under certain conditions, demonstrating the reversibility of the olefin coordination step. The composition of the aldehyde mixture is slightly affected by the nature of the catalytic precursor or the PN ligand used. In the specific case of the alpha-PN ligand [alpha-PN = (S-Ar,S-C)-Ph2PCH-{o-C6H4Cl(Cr(CO)(3))}NHPh], in combination with the [RhCl(COD)](2) precatalyst, products PhCD(CH3)CHO (alpha-D-1) and PhCD(CH2D)CHO (alpha,beta-D-2) were also produced. This result suggests a reversible deprotonation assisted by an intramolecular H-bonding interaction between the dangling ammonium function and the carbonyl moiety. This isotopic exchange process decreases the asymmetric induction from 14 to 7 % ee when using the enantiopure version of this ligand. Aldehydes bearing a D atom on the formyl group, e.g. PhCH(CH3)CDO, were never observed. The latter observation excludes protonolysis of the rhodium-acyl intermediate as the aldehyde forming step. In addition, it also excludes a bimolecular reaction involving the rhodium-acyl and rhodium-hydride intermediates. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)
  • Bonatti, C.; Gourmelon, N. & Vivier, T.
    | Perturbations of the derivative along periodic orbits
    | Ergodic Theory and Dynamical Systems, 2006 , 26 , 1307-1337 , DOI 10.1017/S0413385706000253 | Mathematics, Applied; Mathematics | cited 7 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    We show that a periodic orbit of large period of a diffeomorphism or flow either admits a dominated splitting of a prescribed strength or can be turned into a sink or a source by a C-1-small perturbation along the orbit. As a consequence we show that the linear Poincare flow of a C-1-vector field admits a dominated splitting over any robustly transitive set.
  • Cluzel, B.; Picard, E.; Charvolin, T.; Hadji, E.; Lalouat, L.; de Fornel, F.; Sauvan, C. & Lalanne, P.
    | Near-field spectroscopy of low-loss waveguide integrated microcavities
    | Applied Physics Letters, 2006 , 88 , 051112 , DOI 10.1063/1.2170141 | Physics, Applied | cited 7 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    A scanning near-field spectroscopy method is used to observe loss reduction and Q-factor enhancement due to transverse-mode profile matching within photonic-crystal microcavities. Near-field measurements performed directly on cavity modes are compared with three-dimensional calculations and quantitative agreement is observed. (c) 2006 American Institute of Physics.
  • Garnier, S.; Gidaszewski, N.; Charlot, M.; Rasplus, J. Y. & Alibert, P.
    | Hybridization, developmental stability, and functionality of morphological traits in the ground beetle Carabus solieri (Coleoptera, Carabidae)
    | Biological Journal of the Linnean Society, 2006 , 89 , 151-158 | Evolutionary Biology | cited 7 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    The assessment of developmental stability in hybrids can provide valuable information in the study of species formation because it allows an evaluation of the degree of incompatibility of genetic systems that control developmental processes. The present study assessed the impact of two hybridization events, assumed to have occurred at different times, on developmental instability in the ground beetle Carabus solieri. Developmental instability was estimated in 678 individuals from 27 populations from the fluctuating asymmetry (FA) levels of four morphological traits: the tibia length of middle and hind legs, which are functional structures, and the length and the proximal width of the hind wings, which are vestigial and thus nonfunctional structures. Significant variations of FA levels between populations were shown only for the wing width. For this trait, FA levels in hybrids were higher than in their parental entities for both hybridization events, indicating a significant divergence of the gene systems controlling development between the parental entities in the two hybridization cases. As expected, wing traits exhibited FA levels at least three times higher than leg trait. Finally, the potential interest of vestigial traits in the particular context of hybridization is discussed. (c) 2006 The Linnean Society of London, Biological Journal of the Linnean Society, 2006, 89, 151-158.
  • Habes, D.; Morakchi, S.; Aribi, N.; Farine, J. P. & Soltani, N.
    | Boric acid toxicity to the German cockroach, Blattella germanica: Alterations in midgut structure, and acetylcholinesterase and glutatbione S-transferase activity
    | Pesticide Biochemistry and Physiology, 2006 , 84 , 17-24 , DOI 10.1016/j.pestbp.2005.05.002 | Biochemistry & Molecular Biology; Entomology; Physiology | cited 7 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5548 )
  • 2010.05.25
    Abstract:
    Oral toxicity of boric acid, an inorganic insecticide, was evaluated on German cockroach, Blattella germanica L. (Dictyoptera, Blattellidae). Newly emerged adults were exposed to various concentrations of boric acid incorporated into the diet. Results showed that treated insects exhibited toxic symptoms with a dose-dependent mortality. Histological study of midgut revealed alterations in the epithelial cells and a significant increase in the epithelium thickness. In a second series of experiments, the compound was investigated on the activities of acetylcholinesterase (AChE) and glutathione S-transferases (GSTs). Data showed that the compound induced GSTs and reduced the activity of AChE. From this experiment, it may be concluded that ingested boric acid caused death of insects perhaps Ultimately by starvation Via alterations Of the midgut. Additionally, the compound seemed to present a neurotoxic action as evidenced by the symptoms of poisoning and the reduction in AchE activity. (c) 2005 Elsevier Inc. All rights reserved.
  • Halime, Z.; Balieu, S.; Lachkar, M.; Roisnel, T.; Richard, P. & Boitrel, B.
    | Functionalization of porphyrins: Mechanistic insights, conformational studies, and structural characterizations
    | European Journal of Organic Chemistry, 2006 , 1207-1215 , DOI 10.1002/ejoc.200500685 | Chemistry, Organic | cited 7 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    The condensation of 3-chloromethylbenzoyl chloride with three atropisomers of meso-5,10,15,20-tetrakis (2-aminophenyl)porphyrin (TAPP) is reported, followed by the reaction of the anion of diethyl malonate to prepare various strapped porphyrins. According to two different geometries of the straps, the resulting preorganization of the hanging ethoxycarbonyl groups is more or less adapted to the coordination of cations such as lanthanides. The conformational study, as well as the X-ray structures of three strapped porphyrins, demonstrate that among the three atropisomers investigated in this work, only two of them lead to strapped porphyrins in which an ethoxycarbonyl group is directed towards the centre of the porphyrin. Additionally, we were able to explain some peculiar reactivities observed for single-strapped porphyrins, as the 5-15 strapped geometry is shown to be favoured. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006).
  • Marques, A. N.; Monna, F.; da Silva, E. V.; Fernex, F. E. & Simoes, F. F. L.
    | Apparent discrepancy in contamination history of a sub-tropical estuary evaluated through Pb-210 profile and chronostratigraphical markers
    | Marine Pollution Bulletin, 2006 , 52 , 532-539 , DOI 10.1016/j.marpolbul.2005.09.048 | Environmental Sciences; Marine & Freshwater Biology | cited 7 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : UMR5594 )
  • 2010.05.25
    Abstract:
    Zn and Cd concentrations, stable lead isotopes and Pb-210-derived chronology were determined in a sediment core sampled at Sepetiba Bay (South-eastern Brazil). During the last decades, the bay's watershed has been modified by the increase of industrial activities and human interventions. In particular, Zn and Cd ore treatment plants were built near the coast in 1960 and 1970, respectively, and water has been diverted from the adjacent Paraiba do Sul River watershed since 1950. The core collected at shallow depth near the industrial area exhibits four successive events: (i) at 50 cm depth, a change in the Pb-206/Ph-207 ratio from about 1.162 to more than 1.18 might be the result of the Sao Francisco Channel opening and water diversion from Paraiba do Sul river; (ii) at 40 cm depth, Zn concentration starts to increase (up to 0.8 mg g(-l)) (iii) above 30 cm depth, relatively high Cd concentrations (up to 1.6 mu g g(-l)) are observed and (iv) at 16 cut depth, change in unsupported Pb-210 slope is probably related to a waste dam built to prevent strong metal contamination in the bay. Sediment accumulation rates evaluated by Zn and Cd profiles used as time-markers are higher than those calculated from Pb-210-based chronology models. Using the constant initial concentration (CIC) model both events are supposed to date back to about 1884 and 1902, respectively, while using the constant rate of supply (CRS) model it shifts to about 1925 and 1935. Such discrepancies are probably assigned to the fact that these models do not take into account site-specific local sedimentation dynamics. In the study area, particles deposition seems to be controlled by enrichment with unsupported Pb-210 transported by runoff from a mangrove flat bank. Chronology derived from a model that assumes an exponential increase of the initial Pb-210 activity fits well with the estimated rates obtained from historical events. (c) 2005 Elsevier Ltd. All rights reserved.
  • Monna, F.; Poujol, M.; Losno, R.; Dominik, J.; Annegarn, H. & Coetzee, H.
    | Origin of atmospheric lead in Johannesburg, South Africa
    | Atmospheric Environment, 2006 , 40 , 6554-6566 , DOI 10.1016/j.atmosenv.2006.05.064 | Environmental Sciences; Meteorology & Atmospheric Sciences | cited 7 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS ; SVT / Code(s) unite(s) : UMR5594 ; UMR5184-1088 )
  • 2010.05.25
    Abstract:
    The origin of lead in the atmosphere of Johannesburg, South Africa was investigated on the basis of elemental and lead isotopic analyses of coals, mine dumps, gasoline, and about 30 epiphytic lichen samples. Lead predominantly comes from automotive exhausts in urban and suburban areas, as leaded antiknock additives were still in use in South Africa at the time of the study. Although dust emissions from the numerous mine-tailing dumps were expected to contribute significantly to the heavy metal budget, the southern townships that are surrounded by the dumps (such as Soweto and other historically Black residential areas) do not appear to be more than partially influenced by them, and this influence seems to be geographically limited. Domestic coal burning, suspected to account for the total lead content in the air, is also recognised, but only acts as a minor source of lead, even in townships. (c) 2006 Elsevier Ltd. All rights reserved.
  • Poulin-Charronnat, B.; Bigand, E. & Koelsch, S.
    | Processing of musical syntax tonic versus subdominant: An event-related potential study
    | Journal of Cognitive Neuroscience, 2006 , 18 , 1545-1554 | Neurosciences; Psychology, Experimental | cited 7 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    The present study investigates the effect of a change in syntactic-like musical function on event-related brain potentials (ERPs). Eight-chord piano sequences were presented to musically expert and novice listeners. instructed to watch a movie and to ignore the musical sequences, the participants had to react when a chord was played with a different instrument than the piano. Participants were not informed that the relevant manipulation was the musical function of the last chord (target) of the sequences. The target chord acted either as a syntactically stable tonic chord (i.e., a C major chord in the key of C major) or as a less syntactically stable subdominant chord (i.e., a C major chord in the key of G major). The critical aspect of the results related to the impact such a manipulation had on the ERPs. An N5-like frontal negative component was found to be larger for subdominant than for tonic chords and attained significance only in musically expert listeners. These findings suggest that the subdominant chord is more difficult to integrate with the previous context than the tonic chord (as indexing by the observed N5) and that the processing of a small change in musical function occurs in an automatic way in musically expert listeners. The present results are discussed in relation to previous studies investigating harmonic violations with ERPs.
  • Sijikumar, S.; Roucou, P. & Fontaine, B.
    | Monsoon onset over Sudan-Sahel: Simulation by the regional scale model MM5
    | Geophysical Research Letters, 2006 , 33 , L03814 , DOI 10.1029/2005GL024819 | Geosciences, Multidisciplinary | cited 7 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : FRE2740 )
  • 2010.05.25
    Abstract:
    The Mesoscale Model MM5 is used to study the regional features of the West African Monsoon onset. In order to increase the results, simulations are carried out for eight consecutive seasons ( March to September) of the years 1994 to 2001. The results show that the model can reproduce the dynamical features of the monsoon in a reasonably good manner but the seasonal cycle seems enhanced. It is hypothesized that overestimated rainfall amounts could be related to a poor representation of the land surface characteristics. Nevertheless, the mean simulated monsoon onset dates are similar to those find in the CMAP data set. The onset is characterized by an apparent increase in zonal flow that could bring moisture from the eastern Atlantic ocean, in conjunction with a deepening of the Saharan heat low. These results show that the model can be used to detail the basic processes linked to the monsoon onset and to perform dynamical downscaling.
  • Tran, H.; Flaud, P. M.; Fouchet, T.; Gabard, T. & Hartmann, J. M.
    | Model, software and database for line-mixing effects in the nu(3) and nu(4) bands of CH4 and tests using laboratory and planetary measurements - II: H-2 (and He) broadening and the atmospheres of Jupiter and Saturn
    | Journal of Quantitative Spectroscopy & Radiative Transfer, 2006 , 101 , 306-324 , DOI 10.1016/j.jqsrt.2005.11.033 | Spectroscopy | cited 7 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    The absorption shapes of the nu(2), nu(3) and nu(4) infrared bands of CH4 perturbed by H-2 in large ranges of pressure and temperature have been measured in the laboratory. In order to model these spectra, the theoretical approach accounting for line-mixing effects proposed for CH4-N-2 and CH4-air and successfully tested in the companion paper (1), is used. As before, state-to-state rotational rates are used together with some empirical parameters that are deduced from a fit of a single room temperature spectrum of the nu(3) band at about 50 atm. The comparisons between measured and calculated spectra in the nu(3) and nu(4) regions under a vast variety of conditions (9-300 atm, 80-300 K) then demonstrate the quality and consistency of the proposed model. In the case of the nu(2) band, which is of E symmetry, specific parameters, different from those adapted to the nu(3) and nu(4) transitions of F-2 Symmetry, are used for proper modeling of the spectral shape. Furthermore, as shown previously, a broad absorption feature grows underneath the nu(2) band with increasing H-2 density. The latter, for which an empirical model is proposed, is attributed to a collision-induced absorption (CIA) process in methane. From the developed models, a database and associated software are built for the updating of planetary atmospheres radiative transfer codes. The quality of these tools is then further demonstrated using emission measurements of the Jovian and Saturnian atmospheres in the nu(4) region (7-10 mu m) recorded by the Short Wave Spectrometer of the Infrared Space Observatory and the Composite Infrared Spectrometer on-board Cassini. Comparisons between measured radiances and predictions confirm the failure of the purely Lorentzian approach and the quality of the proposed line-mixing model. Furthermore, it is shown that the methane CIA contribution has a significant influence on the planetary emission beyond 1400cm(-1). (C) 2005 Elsevier Ltd. All rights reserved.
  • Vignal, V.; Mary, N.; Oltra, R. & Peultier, J.
    | A mechanical-electrochemical approach for the determination of precursor sites for pitting corrosion at the microscale
    | Journal of the Electrochemical Society, 2006 , 153 , B352-B357 , DOI 10.1149/1.2218762 | Electrochemistry; Materials Science, Coatings & Films | cited 7 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    The influence of metallurgical defects and residual surface stresses generated by polishing on the pitting susceptibility of duplex stainless steels was studied by combining macro- and microelectrochemical measurements with thermal-mechanical simulation and metallography tests. It has been shown that pits initiate in both phases at metallurgical point defects (such as oxide inclusions in the ferrite and dislocation lines in the austenite). By contrast, the surface stress state was the driving force for pit initiation along the austenite/ferrite interface. Experiments at the macroscale revealed that this process represents about 40% of the total number of pits observed. It has been demonstrated that the local stress gradient was the key-parameter in pit initiation and that the local average stress was the parameter governing the transition from metastable to stable pitting.
  • Ballivet-Tkatchenko, D.; Chermette, H.; Plasseraud, L. & Walter, O.
    | Insertion reaction of carbon dioxide into Sn-OR bond. Synthesis, structure and DFT calculations of di- and tetranuclear isopropylcarbonato tin(IV) complexes
    | Dalton Transactions, 2006 , 5167-5175 , DOI 10.1039/b610812a | Chemistry, Inorganic & Nuclear | cited 6 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    The reaction of carbon dioxide with the stannane (Bu2Sn)-Bu-n((OPr)-Pr-i)(2) and distannoxane [Bu-n(2)((PrO)-Pr-i) Sn](2)O leads to the selective insertion into one Sn - (OPr)-Pr-i bond generating the corresponding (Bu2Sn)-Bu-n((OPr)-Pr-i)(OCO2 Pr-i) and Bu-n(2)((PrO)-Pr-i) SnOSn(OCO2 Pr-i)Bu-n(2) species. Both compounds are characterised by multinuclear NMR, FT-IR and single-crystal X-ray crystallography. In the solid state, they adopt a dimeric arrangement with bridging isopropoxy and terminal isopropylcarbonato ligands. The X-ray crystal structure of the dinuclear stannane shows that the Sn2O2 ring and the two Sn - OCO2C fragments are nearby coplanar. The same holds for the ladder-type tetranuclear distannoxane. The dimeric structures are also evidenced by solution NMR in non-coordinating solvents. Interestingly, the assignment of the exo and endo tin resonances of the dimeric distannoxane is unambiguous using a labeled (CO2)-C-13 experiment. The stability of the dimeric association has been probed in the stannane series on the basis of DFT calculations.
  • Chevalier, S.; Issartel, C.; Cueff, R.; Buscaif, H.; Strehl, G. & Borchardt, G.
    | Influence of the mode of introduction of a reactive element on the high temperature oxidation behavior of an alumina-forming alloy. Part III: The use of two stage oxidation experiments and in situ X-ray diffraction to understand the oxidation mechanisms
    | Materials and Corrosion-werkstoffe Und Korrosion, 2006 , 57 , 476-483 , DOI 10.1002/maco.200503943 | Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering | cited 6 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    The aim of this work was to investigate several different yttrium introduction routes to improve the high temperature oxidation resistance of a Fe-20Cr-5Al model alloy. Y2O3 sol-gel coatings, Y2O3 metal-organic chemical vapor deposition (MOCVD) coatings, yttrium. ion implantation and yttrium as alloying element (0.1 wt.%) were the different methods of introduction of the reactive element. Both isothermal and cyclic oxidation tests showed that the surface introduction of yttrium or yttrium oxide did not drastically improve the oxidation behavior of the steel. Complementary experiments were performed to understand the lack of major beneficial effects of the so-treated samples. Two stage oxidation experiments under 200 mbar O-16(2) and O-18(2) followed by secondary neutral mass spectrometry (SNMS) were performed to understand the alumina scale growth mechanisms, according to the introduction route of the reactive element. The results exhibited that the yttrium induced an increase of the inward transport of oxygen through the alumina scale compared to the untreated specimen. Nevertheless, the outward transport of aluminum was generally observed, except for the specimen containing Y as alloying element, which exhibited only a single O-18 peak close to the metal/oxide interface. Phase transformations during the oxidation at 1100 degrees C were registered by in-situ X-ray diffraction (XRD). The untreated alloy was only covered by a thin layer of alpha-Al2O3. For implanted specimens, yttrium was incorporated in Y3Al5O12 and YAlO3 phases. All the YAlO3 is transformed into Y3Al5O12 after less than 10 h. For the MOCVD or the sol-gel coated samples, the primary formed YAlO3 phase was progressively transformed into Y3Al5O12. For the Fe-20Cr-5Al-0.1Y alloy, no yttrium containing phases could be detected, even after 40 h of oxidation test at 1100 degrees C.
  • Magdesieva, T. V.; Graczyk, M.; Vallat, A.; Nikitin, O. M.; Demyanov, P. I.; Butin, K. P. & Vorotyntsev, M. A.
    | Electrochemically reduced titanocene dichloride as a catalyst of reductive dehalogenation of organic halides
    | Electrochimica Acta, 2006 , 52 , 1265-1280 , DOI 10.1016/j.electacta.2006.07.025 | Electrochemistry | cited 6 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    We have studied a reaction between the reduced form of titanocene dichloride (CP2TiCl2) and a group of organic halides: benzyl derivatives (4-X-C6H4,CH,Cl, X = H, NO2, CH3; 4-X-C6H4CH2Br, X = H, NO2, PhC(O); 4-X-C6H4CH2SCN, X = H, NO2) as well as three aryl halides (4-NO(2)C(6)H(4)Hal, Hal = Cl, Br; 4-CH3O-C6H4Cl). It has been shown that the electrochemical reduction Of CP2TiCl2 in the presence of these benzyl halides leads to a catalytic cycle resulting in the reductive dehalogenation of these organic substrates to yield mostly corresponding toluene derivatives as the main product. No debalogenation has been observed for aryl derivatives. Based on electrochemical data and digital simulation, possible schemes of the catalytic process have been outlined. For non-substituted benzyl halides halogen atom abstraction is a key step. For the reaction of nitrobenzyl halides the complexation of Ti(III) species with the nitro group takes place, with the electron transfer from Ti(III) to this group (owing to its highest coefficient in LUMO of the nitro benzyl halide) followed by an intramolecular dissociative electron redistribution in the course of the heterolytic C-Hal bond cleavage. The results for reduced titanocene dichloride centers immobilized inside a polymer film showed that the catalytic reductive dehalogenation of the p-nitrobenzyl chloride does occur but with a low efficiency because of the partial deactivation of the film due to the blocking of the electron charge transport between the electrode and catalytic centers. (c) 2006 Elsevier Ltd. All rights reserved.
  • Perrier, V.; Vannier, J.; Racheboeuf, P. R.; Charbonnier, S.; Chabard, D. & Sotty, D.
    | Syncarid crustaceans from the Montceau lagerstatte (Upper Carboniferous; France)
    | Palaeontology, 2006 , 49 , 647-672 | Paleontology | cited 6 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Key aspects of the morphology, autecology, systematics and taphonomy of the crustacean syncarids from the Montceau Lagerstatte (Upper Carboniferous, Stephanian B; France) are presented. Palaeocaris secretanae is the most abundant faunal element of the Montceau biota and shows striking morphological similarities with Palaeocaris typus from the Mazon Creek Lagerstatte (Westphalian D; Illinois, USA). Palaeocaris secretanae was a shrimp-like animal with a short head (no head shield), large mandibles, 14 trunk segments (the first one being reduced) and a fan-like caudal termination. Both the body and the appendage design indicate abilities for crawling on the substratum (slender endopods) and for escape reaction (uropodal fan, pleonal flexibility), although swimming activities may have been reduced (trunk appendages with small flap-like exopods). Details of the appendages involved in feeding, e.g. mandibles and maxillipeds, indicate poor ability for predation but point to an omnivorous detritus feeding mode. Poorly developed respiratory organs (small cylindrical epipods) suggest a relatively low level of locomotory activity. The field of vision may have been large and panoramic (stalked eyes). Rows of pores on 12 trunk segments are interpreted as possible sensory organs used for current detection. Females were brooding eggs (clusters of eggs preserved along anteroventral trunk). Microprobe analysis indicates that siderite is the major component of the nodules. Four events played a key-role in the three-dimensional preservation of syncarids: (1) rapid burial, (2) minimal decomposition, (3) phosphatic mineralization shortly after the animal's death and (4) nodule formation around the carcass. Palaeocaris secretanae is morphologically close to Recent syncarids such Anaspides tasmaniae (freshwater streams, Australia) in its general body plan and detailed anatomy, e.g. mouth parts, indicating morphological stasis in syncarids over more than 200 million years.
  • Picozzi, A.
    | Nonequilibrated oscillations of coherence in coupled nonlinear wave systems
    | Physical Review Letters, 2006 , 96 , 013905 , DOI 10.1103/PhysRevLett.96.013905 | Physics, Multidisciplinary | cited 6 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We show that a conservative system of a pair of coupled incoherent nonlinear waves exhibits huge oscillations of coherence, which are characterized by a recurrent transfer of noise fluctuations between the coupled waves. This sustained oscillatory behavior is in contradiction with the expected irreversible evolution towards equilibrium. As a consequence, the process of coherence transfer is characterized by a reduction of nonequilibrium entropy, which violates the H theorem of entropy growth inherent to the kinetic theory.
  • Pohl, B. & Camberlin, P.
    | Influence of the Madden-Julian Oscillation on East African rainfall. I: Intraseasonal variability and regional dependency
    | Quarterly Journal of the Royal Meteorological Society, 2006 , 132 , 2521-2539 , DOI 10.1256/qj.05.104 | Meteorology & Atmospheric Sciences | cited 6 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : FRE2740 )
  • 2010.05.25
    Abstract:
    The influence of the Madden-Julian Oscillation (MJO) on rainfall amounts over Equatorial East Africa (Kenya and northern Tanzania) is analysed for the period 1979-95 at the intraseasonal (pentad) time-scale. The two rainy seasons (March to May and October to December) are considered. Intraseasonal wet events in East Africa are embedded in large-scale zonal circulation anomaly patterns along the equator, showing distinct eastward propagation. It is further found that these 'Wet' events display a clear phasing with respect to the MJO cycle. This phasing is expressed as out-of-phase variations between the Highland and the coastal areas. Such a pattern is suggested to reflect different rain-causing mechanisms. MJO phases leading to wet spells in the western (Highland) region are those associated with the development of large-scale convection in the Africa/Indian Ocean region. These events are unambiguously related to deep convection, fuelled by low-level westerly moisture advection. MJO phases leading to wet spells in the eastern (coastal) region are often those associated with overall suppressed deep convection in the Africa/Indian Ocean region. However, these phases induce moisture advection from Indian Ocean. The possible role of stratiform rainfall or relatively shallow convection in the coastal wet spells observed in this phase is discussed. The contrasting rainfall conditions found in the two regions for the two opposite MJO phases are strongly correlated with the pressure gradient between the Indian and Atlantic Oceans.
  • Sangouard, N.; Lacour, X.; Guerin, S. & Jauslin, H. R.
    | CNOT gate by adiabatic passage with an optical cavity
    | European Physical Journal D, 2006 , 37 , 451-456 , DOI 10.1140/epjd/e2005-00315-2 | Physics, Atomic, Molecular & Chemical | cited 6 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We propose a. scheme for the construction of a CNOT gate by adiabatic passage in an optical cavity. In opposition to a previously proposed method, the technique is not based on fractional adiabatic passage, which requires the control of the ratio of two pulse amplitudes. Moreover, the technique constitutes a decoherence-free method in the sense that spontaneous emission and cavity clamping are avoided since the dynamics follows dark states.
  • Secondi, J.; Faivre, B. & Bensch, S.
    | Spreading introgression in the wake of a moving contact zone
    | Molecular Ecology, 2006 , 15 , 2463-2475 , DOI 10.1111/J.1365-294X.2006.02948.x | Biochemistry & Molecular Biology; Ecology; Evolutionary Biology | cited 6 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    An increasing number of studies describe moving hybrid zones. This raises the issue of their actual frequency and emphasizes the need for methods that enable the detection of zone movements without historical records. Asymmetric introgression, usually considered as a signature of geographical shift, might be misleading when applied to mitochondrial or potentially non-neutral markers. We investigated mitochondrial and genomic introgression, using 30 AFLP derived markers, in a well-documented moving avian contact zone between two warblers. We found no instances of cross-species transmission of mitochondrial DNA but we detected nuclear introgression. Introgression levels were higher in the expanding species. Highest introgression was observed in populations that recently became allopatric than in current sympatric populations, which suggests that alien genetic material mainly spread at the time just before the receding species became extinct. We propose that either local recruitment or positive selection on some loci contribute to this pattern. Furthermore, we propose that, when the rarefaction of sexual partners drive the hybridization process, movement could be revealed by introgression peaking on the rear edge of the moving zone, or in its close vicinity.
  • Stige, L. C.; David, B. & Alibert, P.
    | On hidden heterogeneity in directional asymmetry - can systematic bias be avoided?
    | Journal of Evolutionary Biology, 2006 , 19 , 492-499 , DOI 10.1111/j.1420-9101.2005.01011.x | Ecology; Evolutionary Biology; Genetics & Heredity | cited 6 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Directional asymmetry (DA) biases the analysis of fluctuating asymmetry (FA) mainly because among-individual differences in the predisposition for DA are difficult to detect. However, we argue that systematic bias mainly results from predictable associations between signed right-left asymmetry and other factors, i.e. from systematic variation in DA. We here demonstrate methods to test and correct for this, by analysing bilateral asymmetry in size and shape of an irregular sea urchin. Notably, in this model system, DA depended significantly on body length and geographic origin, although mean signed asymmetry (mean DA) was not significant in the sample as a whole. In contrast to the systematic variation in DA, undetectable, random variability in the underlying DA mainly leads to reduced statistical power. Using computer simulations, we show that this loss of power is probably slight in most circumstances. We recommend future studies on FA to routinely test and correct for not only as yet for mean DA, but also for systematic variation in DA.
  • Andrianoelisoa, H. S.; Menut, C.; de Chatelperron, P. C.; Saracco, J.; Ramanoelina, P. & Danthu, P.
    | Intraspecific chemical variability and highlighting of chemotypes of leaf essential oils from Ravensara aromatica Sonnerat a tree endemic to Madagascar
    | Flavour and Fragrance Journal, 2006 , 21 , 833-838 , DOI 10.1002/ffj.1735 | Chemistry, Applied; Food Science & Technology | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    Ravensara aromatica Sonnerat is a tree endemic to Madagascar. The essential oil extracted from the leaves is used in aromatherapy. Previous chemical studies have generated some confusion with regard to the chemical composition of this essential oil. In order to eliminate this uncertainty, we undertook a systematic evaluation of the chemical composition of essential oils from leaves of this species. The study focused on 28 individual samples formally identified as R. aromatica. The essential oils were obtained by hydrodistillation and analysed by GC and GC-MS. It was possible to distinguish four groups of trees through principal components analysis and agglomerative hierarchical clustering analysis of the seven chief molecules identified in their essential oils. Two groups were characterized by a prevalence of compounds with an aromatic structure: methyl chavicoll (representing more than 90% of the essential oil) in the first group and methyl eugenol (74-82%) in the second group. The predominant compounds of the other two groups proved to be of the monoterpenic type: alpha-terpinene (25-28%) and limonene (15-22%) in the third group, while sabinene (25-34%), linalool (7-21%) and terpinen-4-ol (6-12%) were the primary constituents of the essential oils in the fourth group. The importance of these results for the commercial production of the essential oils from this species is discussed. Copyright (c) 2006 John Wiley & Sons, Ltd.
  • Chambaron, S.; Ginhac, D.; Ferrel-Chapus, C. & Perruchet, P.
    | Implicit learning of a repeated segment in continuous tracking: A reappraisal
    | Quarterly Journal of Experimental Psychology, 2006 , 59 , 845-854 , DOI 10.1080/17470210500198585 | Psychology, Biological; Physiology; Psychology; Psychology, Experimental | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    Several prior studies (e. g., Shea, Wulf, Whitacre, & Park, 2001; Wulf & Schmidt, 1997) have apparently demonstrated implicit learning of a repeated segment in continuous-tracking tasks. In two conceptual replications of these studies, we failed to reproduce the original findings. However, these findings were reproduced in a third experiment, in which we used the same repeated segment as that used in the Wulf et al. studies. Analyses of the velocity and the acceleration of the target suggests that this repeated segment could be easier to track than the random segments serving as control, accounting for the results of Wulf and collaborators. Overall these experiments suggest that learning a repeated segment in continuous-tracking tasks may be much more difficult than learning from a repeated sequence in conventional serial reaction time tasks. A possible explanation for this difference is outlined.
  • El Hammari, L.; Laghzizil, A.; Saoiabi, A.; Barboux, P. & Meyer, M.
    | Chemical modification of porous calcium hydroxyapatite surfaces by grafting phenylphosphonic and phenylphosphite acids
    | Colloids and Surfaces A-physicochemical and Engineering Aspects, 2006 , 289 , 84-88 , DOI 10.1016/j.colsurfa.2006.04.009 | Chemistry, Physical | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5633 )
  • 2010.05.25
    Abstract:
    It is well known that the incorporation of organic molecules can provide an effective route to modify the surface properties of apatite ceramics. The present study shows that phosphonates can react with calcium ions to control the formation of the hydroxyapatite structures. The grafting of C6H5PO(OH)(2) (PPOH) and C6H5PC(OH)H (PPH) was used to increase the specific surface area as well as the porosity of hydroxyapatite materials. The higher specific surface area for HAp treated by PPOH is around 267 m(2)/g compared to the pure HAp (140 m(2)/g). The phenyl (C6H5) groups are removed by thermal treatment around 500 degrees C. After treatment at 800 degrees C, organoapatites (PP-HAp) are converted to stoiochiometric hydroxyapatites. (c) 2006 Elsevier B.V. All rights reserved.
  • Fang, S. Z. & Zhang, T. S.
    | Isotropic stochastic flow of homeomorphisms on S-d for the critical Sobolev exponent
    | Journal De Mathematiques Pures Et Appliquees, 2006 , 85 , 580-597 , DOI 10.1016/j.matpur.2005.10.012 | Mathematics, Applied; Mathematics | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    In this work, we shall deal with the critical Sobolev isotropic Brownian flows on the sphere S-d. Based on previous works by O. Raimond and LeJan and Raimond (see [O. Raimond, Ann. Inst. H. Poincare 35 (1999) 313-354] and [Y LeJan, O. Raimond, Ann. of Prob. 30 (2002) 826-873], we prove that the associated flows are flows of homeomorphisms. (c) 2005 Elsevier SAS. All rights reserved.
  • Finot, C.; Dudley, J. M. & Millot, G.
    | Generation of dark solitons by interaction between similaritons in Raman fiber amplifiers
    | Optical Fiber Technology, 2006 , 12 , 217-226 , DOI 10.1016/j.yofte.2006.02.002 | Engineering, Electrical & Electronic; Optics; Telecommunications | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We present a new method to generate dark soliton trains by exploiting the interaction between two time-delayed optical similaritons with the same wavelength. The temporal overlap of two similariton pulses creates a sinusoidal beating which subsequently evolves into an ultrahigh repetition-rate train of dark solitons through the combined effects of normal dispersion, nonlinearity, and adiabatic Raman gain. The experimental results are in good agreement with numerical predictions. We also investigate how the the repetition rate of the dark soliton train depends on the time separation between the initial pulses, the initial pulse energy, and the Raman gain. Finally, we numerically study the interaction between three similaritons of the same wavelength. (C) 2006 Elsevier Inc. All rights reserved.
  • Jaouadi, K.; Zouari, N.; Mhiri, T.; Daoud, A. & Jannin, M.
    | Structural and vibrational study of a new mixed dipotassium hydrogenselenate dihydrogenphosphate K-2(HSeO4)(1.5)(H2PO4)(0.5)
    | Journal of Alloys and Compounds, 2006 , 413 , 46-53 , DOI 10.1016/j.jallcom.2005.07.017 | Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    Ongoing studies of the KHSeO4-KE2PO4 system, aimed at developing novel proton conducting solids, resulted in the new compound K-2(HSeO4)(1.5)(H2PO4)(0.5) (dipotassium hydrogenselenate dihydrogen phosphate). The crystals have been prepared by slow evaporation of an aqueous solution at room temperature. The structural properties of the crystals were characterized by X-ray single analysis (performed at room temperature), which revealed that K-2(HSeO4)(1.5)(H2PO4)(0.5) (KHSeP) crystallizes in space group P (1) over bar with lattice parameters: a= 7.417(3) angstrom, b = 7.668(2) angstrom, c = 7.744(5) angstrom, alpha = 71.59(3)degrees, beta = 87.71(4)degrees and gamma = 86.04(6)degrees. The compound has a unit cell volume 416.8(3) angstrom(3) and two formula units per cell, giving a calculated density of 2.732. The structure was solved from 3210 independent reflections and refined with 112 parameters yielded weighted residuals of 0.1113 and 0.0594 based on F-2 and F values, respectively. This structure is characterized by HSeO4- and disordered (HxSe/P)O-4(-) tetrahedra connected to dimmer via hydrogen bridges. These dimmers are linked and stabilized by an additional hydrogen bonds (O-H-O) and hydrogen bonds (O-H... O) to built a chains of dimmers, which are parallel to the [0 10] direction at the position x = 0.5. The potassium atoms have an eight-fold coordination. The infrared spectrum at room temperature is investigated in the frequency range 4000-400 cm(-1) and confirm a structural disorder in this material and the coexistence of two different anions (H2PO4- and HSeO4-) in the same crystal structure. (c) 2005 Elsevier B.V. All rights reserved.
  • Lambert, L.; Durlet, C.; Loreau, J. P. & Marnier, G.
    | Burial dissolution of micrite in Middle East carbonate reservoirs (Jurassic-Cretaceous): keys for recognition and timing
    | Marine and Petroleum Geology, 2006 , 23 , 79-92 , DOI 10.1016/j.marpetgeo.2005.04.003 | Geosciences, Multidisciplinary | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT ; SVT / Code(s) unite(s) : UMR5027 ; UMR5561 )
  • 2010.05.25
    Abstract:
    This paper discusses burial diagenesis and especially a burial dissolution phase and its effects on micrite microtexture in reservoirs in the Middle East. Three microporous reservoirs were selected: the Cenomanian Mishrif Formation in Iraq; the Kimmeridgian-Tithonian Arab D and the Barremian Kharaib Formations, both in Abu Dhabi. Staining, cathodoluminescence and scanning electron microscopy were used for petrographic observations. In the selected reservoirs, three typical micrite microtextures are distinguished: micro-rhombic, compact anhedral, and rounded. The chronology of diagenesis, based on petrographic observations, shows that mineralogical stabilisation, through high magnesian calcite replacement by low magnesian calcite, led to the formation of micro-rhombic micrites. Non-reservoir facies such as seals present compact anhedral micrites. Correlation between these micrites and high aluminium content suggests alumino-silicate minerals (clays) as a catalyst for pressure dissolution, and thus for reservoir degradation through cementation. Micrites from the upper part of oil reservoirs are dissolved during burial diagenesis. Dissolution is responsible for rounded shape and for reduction of crystal size. It also implies pore diameter and pore-throat size enlargement. Comparison of porosity and permeability with scanning electron microscope data confirms that rounded micrites are better reservoirs than micro-rhombic micrites. (c) 2005 Elsevier Ltd. All rights reserved.
  • Leandre, R. & Rogers, A.
    | Equivariant cohomology, Fock space and loop groups
    | Journal of Physics A-mathematical and General, 2006 , 39 , 11929-11946 , DOI 10.1088/0305-4470/39/38/018 | Physics, Multidisciplinary; Physics, Mathematical | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    Equivariant de Rham cohomology is extended to the infinite-dimensional setting of a loop subgroup acting on a loop group, using Hida supersymmetric Fock space for the Weil algebra and Malliavin test forms on the loop group. The Mathai-Quillen isomorphism (in the BRST formalism of Kalkman) is defined so that the equivalence of various models of the equivariant de Rham cohomology can be established.
  • Martiny, N.; Camberlin, P.; Richard, Y. & Philippon, N.
    | Compared regimes of NDVI and rainfall in semi-arid regions of Africa
    | International Journal of Remote Sensing, 2006 , 27 , 5201-5223 , DOI 10.1080/01431160600567787 | Remote Sensing; Imaging Science & Photographic Technology | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : FRE2740 )
  • 2010.05.25
    Abstract:
    Bi-monthly normalized difference vegetation index (NDVI) at an 8 km spatial resolution from the advanced very high resolution radiometers (AVHRR) was used from 1981 to 1995 to analyse the vegetation response to rainfall supply in semi-arid regions of Africa. Within the 200-600mm annual rainfall belt, for which the apparent NDVI response to rainfall was the strongest, three regions were selected which exhibited different patterns in their NDVI regimes and/or relationships with rainfall. The regions, located in western, southern and eastern Africa, were split into coherent sub-regions in terms of mean regime of photosynthetic activity through a cluster analysis. Overall, intra-regional differences were found to be of relatively minor importance compared with inter-regional differences. The mean annual rain-use efficiency (RUEa) was the highest in southern Africa, followed by that in eastern Africa, and it was the lowest in western Africa. In castern Africa, a distinctive feature was found which consisted of the dissimilar vegetation response to the two rainy seasons. For a given rainfall amount, the NDVI peak was comparatively higher for the short versus the long rains. Then, in all three regions, the correlation between rainfall and NDVI regimes was found to be significantly high. Moreover, the lag between the rainfall and NDVI peaks, which was found to be the smallest in western Africa (1 month), and the highest in southern Africa (over 1.5 month), was determined to be related to the increased rainfall rate before the peak. In view of these results, it is shown that the dominant cause for the inter-regional discrepancies, at the spatial and temporal scales considered, is the structure of the rainy season (distribution, concentration) more than the potential evapotranspiration, vegetation cover or soil type.
  • Meister, C.; Aberhan, M.; Blau, J.; Dommergues, J. L.; Feist-Burkhardt, S.; Hailwood, E. A.; Hart, M.; Hesselbo, S. P.; Hounslow, M. W.; Hylton, M.; Morton, N.; Page, K. & Price, G. D.
    | The Global Boundary Stratotype Section and Point (GSSP) for the base of the Pliensbachian Stage (Lower Jurassic), Wine Haven, Yorkshire, UK
    | Episodes, 2006 , 29 , 93-106 | Geosciences, Multidisciplinary | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Following votes by the Pliensbachian Working Group, the Jurassic Subcommission and the International Commission on Stratigraphy IUGS ratified the proposed Global Boundary Stratotype Section and Point (GSSP) for the base of the Pliensbachian Stage (Lower Jurassic) at the base of bed 73b in the Wine Haven section, Robin Hood's Bay, Yorkshire Coast, UK. This level contains the characteristic ammonite association Bifericeras donovani Dommergues and Meister and Apoderoceras sp. Complementary data include: a) Strontium-isotope stratigraphy, based on analysis of belemnites which yield a calcite Sr-87/Sr-86 ratio for the boundary level of 0.707425 and data supporting interpretation of continuous sedimentation; b) Belemnite oxygen-isotope data indicate a significant temperature drop (similar to 5 degrees C) across the boundary at this locality; c) A Transgressive Systems Tract (TST) initiated in the Aplanatum Subzone (uppermost Sinemurian) continues into the Lowermost Pliensbachian (Taylori Subzone); it forms part of a transgressive facies cycle sensu Graciansky et al. (1998); d) The Upper Sinemurian to lowermost Pliensbachian. at Wine Haven section has a predominantly normal magnetic polarity, but two discrete reversed polarity magnetozones are present. The first spans much of the latest Sinemurian Aplanatum Subzone. It terminates <0.5m below the Sinemurian-Pliensbachian boundary and may prove a valuable chronostratigraphic marker. The second extends from the latest Oxynotum Subzone probably through to the lower part of the Raricostatum Subzone.
  • Poli, R.; Baya, M.; Meunier-Prest, R. & Raveau, S.
    | Electrochemical and DFT studies of the oxidative decomposition of the trihydride complexes Cp*M(dppe)H-3 (M = Mo, W) in acetonitrile
    | New Journal of Chemistry, 2006 , 30 , 759-773 , DOI 10.1039/b518343j | Chemistry, Multidisciplinary | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    A detailed electrochemical study of the oxidative decomposition of the trihydride complexes Cp* M(dppe) H-3 (M = Mo, W) in acetonitrile is presented. For the Mo complex, the decomposition occurs by four different pathways involving classical and non-classical tautomers, whereas only the classical form is accessible for the W derivative. Each of the decomposition pathways has been quantitatively assessed by analyses of the linear sweep voltammograms. In addition to the previously established ( B. Pleune, D. Morales, R. Meunier-Prest, P. Richard, E. Collange, J. C. Fettinger and R. Poli, J. Am. Chem. Soc., 1999, 121, 2209 - 2225) deprotonation, disproportionation, and H-2 reductive elimination occurring via the non-classical tautomer of the 17-electron complex [Cp* Mo(dppe) H-3](+) (obtained by oxidation at E-1/2 = - 0.33 V vs. Ag/AgCl), a new decomposition pathway from the more stable classical tautomer has been identified following a second oxidation process. In addition, the oxidatively induced H-2 reductive elimination, previously evidenced only in THF or CH2Cl2, has been quantitatively assessed in MeCN. This process occurs preferentially by an associative mechanism (k = 0.020( 4) M-1 s(-1)) via the 19-electron [Cp* Mo(dppe) H(H-2)(MeCN)](+) intermediate and is therefore in direct competition with the disproportionation mechanism. The resulting 17-electron [Cp* Mo(dppe) H(MeCN)](+) product is further oxidized at ca. 0.2 V. The oxidation of [ Cp* Mo( dppe) H-3](+) occurs at ca. 1.0 V and the resulting 16-electron [Cp* Mo(dppe) H-3](2+) complex immediately delivers a proton to the starting material, giving [Cp* Mo(dppe) H-4](+) and [Cp* Mo(dppe) H-2](+). The latter coordinates MeCN in a rate determining step to afford [Cp* Mo(dppe) H-2(MeCN)](+). The mechanistic details are consistent with studies at different scan rates and different MeCN concentrations, and are backed up by DFT calculations.
  • Stoffelbach, F.; Richard, P.; Poli, R.; Jenny, T. & Savary, C.
    | Half-sandwich Mo(III) complexes with asymmetric diazadiene ligands
    | Inorganica Chimica Acta, 2006 , 359 , 4447-4453 , DOI 10.1016/j.ica.2006.04.013 | Chemistry, Inorganic & Nuclear | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    The asymmetric 1,4-diazadiene ligands (RN)-N-*=CHCH=NR* [R-* = (S)-CH(CH3)Ph], R(2)(*)dad, and 2,2'-bis(4-ethyloxazoline), as-ox, have been used to generate half-sandwich Mo-111 derivatives by addition to CP2Mo2Cl4. Ligand R(2)(*)dad affords a mononuclear, paramagnetic 17-electron product, CpMoCl2(R(2)(*)dad), whereas as-ox leads to the isolation of a dinuclear compound where only one molecule of ligand has been added per two Mo atoms, Cp2Mo2Cl4(as-ox). In the presence of free as-ox, this compound coexists with the paramagnetic mononuclear complex in solution. Both products are capable of controlling the radical polymerization of styrene under typical atom transfer radical polymerization (ATRP) conditions. However, the tacticity of the resulting polystyrene does not differ from that given by conventional free radical polymerization. (c) 2006 Elsevier B.V. All rights reserved.
  • Thierry, J.; Marchand, D.; Fortwengler, D.; Bonnot, A. & Jardat, R.
    | The Callovian-Oxfordian ammonites of the ANDRA bore-holes of the eastern Paris Basin: biochronostratigraphic synthesis, palaeoecological and palaeobiogeographical interests
    | Comptes Rendus Geoscience, 2006 , 338 , 834-853 , DOI 10.1016/j.crte.2006.05.005 | Geosciences, Multidisciplinary | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    The ammonites collected in nine deep bore-holes and two open wells made by ANDRA near Bure (Meuse Department, France) in the eastern Paris Basin have allowed the following: a precise biochronostratigraphic calibration of the Callovian-Oxfordian clay-rich facies; the correlation between the boreholes and wells by means of the ammonite biostratigraphic units that show an outstanding disparity in the sedimentary registration; undertaking a palaeoecological and palaeobiogeographical investigation into the faunal associations; highlighting their palaeoenvironmental and palaeogeographical applications. In the Middle Callovian-Middle Oxfordian interval, the following remarkable bio-chronostratigraphic elements are seen: the position of the interpositum horizon (uppermost Middle Callovian, Coronatum Zone, Grossouvrei Subzone) and its importance for the localization of the Middle Callovian-Upper Callovian boundary; the respective importance of the paucicostatum horizon (uppermost Upper Callovian, Lamberti Zone, Lamberti Subzone) and the thuouxensis horizon (lowermost Lower Oxfordian, Mariae Zone, Scarburgense Subzone) for the localization of the Callovian-Oxfordian boundary; the validity of the woodhamense horizon based on the morphological variability of the corresponding species-index that corroborates its stratigraphic situation above the scarburgense horizon (Scarburgense Subzone, Mariae Zone, Early Oxfordian); the consequences of the morphological variability of the successive species Cardioceras praemartini, C. alphacordatum, C. praecordatum and their selection as species-index for the three horizons of the Praecordatum Subzone (Mariae Zone, Early Oxfordian); the difficulties of recognizing the Cordatum and Plicatilis Zones because of the scarcity, if not the total lack of characteristic ammonites of these units, which have consequences for the location of the Lower Oxfordian-Middle Oxfordian boundary. The correlations between bore-holes and wells underline that the intracratonic domain to which belongs the Paris Basin has been affected by an unceasing subsidence, which varied in both space and time from the Middle Callovian to the Middle Oxfordian. The subsidence seems to be stronger near the centre of the basin than near its margins, with a maximum activity taking place during the Lower Oxfordian, Mariae Zone, Scarburgense Subzone, woodhamense horizon. The palaeoecological interpretation of the faunal associations indicates a medium palaeodepth (lower offshore) in this eastern part of the Paris Basin, certainly a little more marked towards the centre than on its margins. If not considering the subsidence effects, the palaeodepth does not seem dissimilar to that of the southeastern basin of France. In comparison, the proximity of the former with the Tethyan oceanic domain allows us to deduce that variations of the ammonite assemblages may be related to the different modes of life of the collected taxa. Especially, if compared to the Ammonitina taxa, the selective distribution of the Phylloceratina and Lytoceratina is characteristic of open-sea distal platforms. From a palaeobiogeographical point of view, the Callovian-Oxfordian deposits of the eastern Paris Basin have recorded two boreal southward ammonite invasions: the Kosmoceratidae during the Middle-Upper Callovian, then the Cardioceratidae during the Upper Callovian and Lower Oxfordian. These invasions gave rise to heterogeneous biogeographic areas, which locate between the Boreal and Tethyan Provinces. Considered as transition areas, they are called Subboreal Province and Subtethyan Province; their ammonite associations are composite and their time and space ranges and extensions are variable.
  • Tonello, A.; Wabnitz, S.; Gabitov, I. & Indik, R.
    | Importance sampling of Gordon-Mollenauer soliton phase noise in optical fibers
    | Ieee Photonics Technology Letters, 2006 , 18 , 886-888 , DOI 10.1109/LPT.2006.871817 | Engineering, Electrical & Electronic; Optics; Physics, Applied | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    We develop an importance sampling method to perform the direct numerical computation of the probability density function of the random optical soliton phase under the influence of both amplifier spontaneous emission noise and nonlinear conversion of amplitude to phase fluctuations owing to the Kerr effect, or nonlinear phase noise.
  • Vincent, B.; Rambeau, C.; Emmanuel, L. & Loreau, J. P.
    | Sedimentology and trace element geochemistry of shallow-marine carbonates: an approach to paleoenvironmental analysis along the Pagny-sur-Meuse Section (Upper Jurassic, France)
    | Facies, 2006 , 52 , 69-84 , DOI 10.1007/s10347-005-0026-0 | Geology; Paleontology | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    The Middle Oxfordian formations of the eastern edge of the Paris Basin (France) contain mostly shallow-marine carbonate sediments. A detailed sedimentological study of the Pagny-sur-Meuse section reveals five major environments that make up a depositional profile succession grading from tidal-flat to distal lagoon/oolithic shoal. Stratigraphic cycles were established and illustrate variations of the A/S ratio (accommodation rate/sedimentation rate) and hence variations of accommodation space. Geochemical analyses (Sr, Mg, Fe, and Mn) have been conducted along a part of the section. Statistic analysis of the geochemical data (box diagrams and principal component analysis, PCA) are used to investigate similarities between the variations of trace element contents and depositional environments. An analysis of variance (ANOVA) is used to test whether the amounts of trace elements are related to the depositional environments. The relationship is highly significant for Sr, Fe, and Mn. A number of a posteriori tests are performed with this ANOVA to compare the geochemical data for each environment. Tidal-flats and distal lagoon/oolithic shoal transition are the most significantly discriminated environments. Differences among the lagoonal environments are less obvious. Despite (1) an open diagenetic system that explains the low Sr values and (2) the possible influence of clays on Fe-Mn contents in the upper part of the section, some of the variations in Sr and Fe-Mn seem to reflect changes in depositional environment. A number of hypotheses are proposed about the relations between trace elements and paleoenvironmental parameter records: Sr contents may illustrate variations of paleosalinity in depositional environments, whereas Fe and Mn contents seem to record variations of specific low detrital inputs coming from isolated islands submitted to pedogenesis. Low Sr content coupled with relatively high Fe and Mn contents is indicative of low salinity environment near subaerially exposed islands, located in the proximal part of a reconstructed theoretical depositional profile. Conversely, high Sr content coupled with relatively low Fe and Mn contents reflect a more open marine environment in the distal part of the same profile. Such analysis based on trace element geochemistry does not constitute a model but it shows that Sr, Fe, and Mn can partially record indications about paleoenvironmental conditions in shallow-marine carbonates.
  • Baril, J. L. & Pallo, J. M.
    | Efficient lower and upper bounds of the diagonal-flip distance between triangulations
    | Information Processing Letters, 2006 , 100 , 131-136 , DOI 10.1016/j.ipl.2006.07.001 | Computer Science, Information Systems | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    There remains today an open problem whether the rotation distance between binary trees or equivalently the diagonal-flip distance between triangulations can be computed in polynomial time. We present an efficient algorithm for computing lower and upper bounds of this distance between a pair of triangulations. (c) 2006 Elsevier B.V. All rights reserved.
  • Bentz, S.; Rigaud, T.; Barroca, M.; Martin-Laurent, F.; Bru, D.; Moreau, J. & Faivre, B.
    | Sensitive measure of prevalence and parasitaemia of haemosporidia from European blackbird (Turdus merula) populations: value of PCR-RFLP and quantitative PCR
    | Parasitology, 2006 , 133 , 685-692 , DOI 10.1017/S0031182006001090 | Parasitology | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 ; UMRE1229 )
  • 2010.05.25
    Abstract:
    Haemosporidian parasites are common in birds in which they act as an important selective pressure. While most studies so far have focused on the effect of their prevalence on host life-history traits, no study has measured the effect of parasitaemia. We developed molecular methods to detect, identify and quantify haemosporidia in 2 natural populations of the Blackbird Turdus merula. Three different parasite genotypes were found -1 Haemoproteus and 2 Plasmodium. A PCR-RFLP screening revealed that only approximately 3% of blackbirds were free of parasites, compared to the 34% of uninfected birds estimated by blood smear screening. A quantitative PCR (q-PCR) assay revealed a weaker parasitaemia in microscopically undetected parasites compared to microscopically detected ones. Large parasitaemia differences were found between parasite species, suggesting either differing parasite life-histories or host resistance. Parasitaemias were also weaker in male hosts, and in urban habitats, suggesting that both host factors (e.g. immunity) and habitat characteristics (e.g. vector availability) may modulate parasite density. Interestingly, these differences in parasitaemia were comparable to differences in parasite prevalence estimated by smear screening. This suggests that previous results obtained by smear screening should be reinterpreted in terms of parasitaemia instead of parasite prevalence.
  • Bortchagovsky, E.; Des Francs, G. C.; Molenda, D.; Naber, A. & Fischer, U. C.
    | Transmission of an obliquely incident beam of light through small apertures in a metal film
    | Applied Physics B-lasers and Optics, 2006 , 84 , 49-53 , DOI 10.1007/s00340-006-2296-9 | Optics; Physics, Applied | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We recently found that the intensity of the electric near field of a triangular aperture in a metal film is strongly localized at one edge of the aperture for incident light polarized perpendicular to this edge. Previous numerical calculations of the near field of a triangular aperture in a planar metal film, using the field susceptibility technique, yielded a nearly quantitative agreement with the experiments. Using this numerical technique, we have investigated the influence of an obliquely incident plane wave on the near field of small circular and triangular apertures. An interpretation of the numerical results leads to a deeper understanding of the way in which light transmission through the aperture is excited. The data suggest that after excitation of currents in the metal film by the incident light, a scattering of these currents by the aperture generates the near field of the aperture. We found that the excitation of small apertures (size < 100 nm) is due to a tangential magnetic field whereas the perpendicular electric field plays no role. The excitation of a small aperture can thus be described exclusively by a magnetic polarizability. We found that for thin metal films an interference of the scattered field with the field transmitted through the metal film changes the near field pattern.
  • Brevet, D.; Lucas, D.; Richard, P.; Vallat, A.; Mugnier, Y. & Harvey, P. D.
    | Formation and X-ray structure of the host-guest adduct [Pd-3(dppm)(3)(CO)(NO3)](+) and the mechanism of its electrochemical reduction
    | Canadian Journal of Chemistry-revue Canadienne De Chimie, 2006 , 84 , 243-250 , DOI 10.1139/V05-249 | Chemistry, Multidisciplinary | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    [Pd-3(dppm)(3)(CO)](2+), [Pd-3](2+), reacts with NO3- to form the host-guest adduct [Pd-3(dppm)(3)(CO)(NO3)](+), [Pd-3(NO3)](+). The presence of NO3- inside the cavity is confirmed by X-ray crystallography. Using a qualitative relationship between lambda(max) (UV-vis) and the association constant of various adducts, the relative binding between NO3- and [Pd-3](2+) is in the same order of magnitude of that between CF3CO2- and [Pd-3](2+). Based on Pd center dot center dot center dot O distances, the NO3- ion is relativity more weakly associated to [Pd-3](2+) in comparison with the known [Pd-3(CF3CO2)](+). Using variation of [NO3-] in the presence of [Pd-3](PF6)(2) and variation of scan rates, the resulting cyclic voltammogramms (CV) were simulated to extract both kinetic and thermodynamic constants associated to a square scheme. Both the anodic and cathodic scans of the title cluster exhibits ECE mechanisms (E = electrochemical process; C = chemical process). For the anodic scan, the EEC event is not ruled out, at least as a minor process.
  • Brunella, M.; Pereira, J. V. & Touzet, F.
    | Kahler manifolds with split tangent bundle
    | Bulletin De La Societe Mathematique De France, 2006 , 134 , 241-252 | Mathematics | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    This paper is concerned with compact Kahler manifolds whose tangent bundle splits as a sum of subbundles. In particular, it is shown that if the tangent bundle is a sum of line bundles, then the manifold is uniformised by a product of curves. The methods are taken from the theory of foliations of (co)dimension 1.
  • Chaux, F.; Denat, F.; Espinosa, E. & Guilard, R.
    | An easy route towards regioselectively difunctionalized cyclens and new cryptands
    | Chemical Communications, 2006 , 5054-5056 , DOI 10.1039/b612293k | Chemistry, Multidisciplinary | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5633 )
  • 2010.05.25
    Abstract:
    Reductive amination of various aldehydes with cyclen represents a very convenient method for the synthesis of a wide range of 1,7-difunctionalized cyclens, as well as new cryptands.
  • Comte, J. C. & Marquie, P.
    | Compact-like kink in a real electrical reaction-diffusion chain
    | Chaos Solitons & Fractals, 2006 , 29 , 307-312 , DOI 10.1016/j.chaos.2005.08.212 | Mathematics, Interdisciplinary Applications; Physics, Multidisciplinary; Physics, Mathematical | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 ; EA2979 )
  • 2010.05.25
    Abstract:
    We demonstrate experimentally the compact-like kinks existence in a real electrical reaction-diffusion chain. Our measures show that such entities are strictly localized and consequently present a finite spatial extent. We show equally that the kink velocity is threshold-dependent. A theoretical quantification of the critical coupling under which propagation fails is also achieved and reveals that nonlinear coupling leads to a propagation failure reduction. (c) 2005 Elsevier Ltd. All rights reserved.
  • Conforti, M.; Baronio, F.; Degasperis, A. & Wabnitz, S.
    | Inelastic scattering and interactions of three-wave parametric solitons
    | Physical Review E, 2006 , 74 , 065602 , DOI 10.1103/PhysRevE.74.065602 | Physics, Fluids & Plasmas; Physics, Mathematical | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We study the interactions of velocity-locked three-wave parametric solitons in a medium with quadratic nonlinearity and dispersion. We reveal that the inelastic scattering between three-wave solitons and linear waves may be described in terms of analytical solutions with dynamically varying group velocity, or boomerons. Moreover, we demonstrate the elastic nature of three-wave soliton-soliton collisions and interactions.
  • Doignon, N. & Zagar, D.
    | Do children in the process of learning to read perceive the syllable in writing?
    | Canadian Journal of Experimental Psychology-revue Canadienne De Psychologie Experimentale, 2006 , 60 , 258-274 , DOI 10.1037/cjep2006024 | Psychology, Experimental | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    The goal of this study was to test if apprentice readers (6-7 to 7-8 years old) and beginner readers (8-9 to 10-11 years old) perceive syllabic units in written words. The paradigm of illusory conjunctions was used because it can determine the infra-lexical units identified at the first steps of the written stimuli process. Two experiments were conducted on children from the first (6-7 years old) to the last years (10-11 years old) of the learning-to-read process. Results have shown that children perceive syllables in letter sequences as soon as the end of the first year of the learning-to-read process. The perception of these units is the result of two information sources: the syllabic phonology and the orthographic redundancy. The syllable could then be a pertinent unit in the learning-to-read process.
  • Evrard, D.; Groison, K.; Decken, A.; Mugnier, Y. & Harvey, P. D.
    | Electrochemical reduction properties of A-frame compounds and crystal structure of Pd-2(dppm)(2)(Me)(2)(Br)(+) dimer
    | Inorganica Chimica Acta, 2006 , 359 , 2608-2615 , DOI 10.1016/j.ica.2005.09.048 | Chemistry, Inorganic & Nuclear | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    Two series of A-frame complexes, [Pd-2(dppm)(2)(R)(2)(mu-X)](+) (R = Me and X = Cl, Br, I, H; R = Mes and X = Br, I), were investigated by cyclic voltammetry (CV). The 2-electron reduction potentials for the first series increase from I (-1.10), Br (-1.17), Cl (-1.25) to H (-1.65 V versus SCE, in CHCl3) as well as in the second series; Br (-1.35) and I (-1.38 V versus SCE, in THF). The nature of the LUMO where the electron reduction takes place is qualitatively addressed by DFT on the corresponding model complexes [Pd-2(H2PCH2PH2)(2)(R)(2)(mu-X)](+). The LUMO and (LUMO + 1) of the halide derivatives exhibit the presence of Pd d(x2-y2) atomic orbitals interacting in an anti-bonding fashion with the n-donor orbitals of X-, P, and Me-, explaining in part the observed reactivity upon reduction. The X-ray structure of [Pd-2(dPPM)(2)(Me)(2)(mu-Br)](+) compound exhibits the typical A-frame structure with a Pd center dot center dot center dot Pd non-bonding distance of 3.036(1) angstrom, and long Pd-Br bonds of 2.5623(5) and 2.5793(5) angstrom. 2005 Elsevier B.V. All rights reserved.
  • Favre, A. & Gershunov, A.
    | Extra-tropical cyclonic/anticyclonic activity in North-Eastern Pacific and air temperature extremes in Western North America
    | Climate Dynamics, 2006 , 26 , 617-629 , DOI 10.1007/s00382-005-0101-9 | Meteorology & Atmospheric Sciences | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : FRE2740 )
  • 2010.05.25
    Abstract:
    Synoptic extra-tropical cyclone and anticyclone trajectories have been constructed from mean daily sea level pressure (SLP) data using a new automated scheme. Frequency, intensity and trajectory characteristics of these transients have been summarized to form indices describing wintertime cyclonic and anticyclonic activity over the North-Eastern Pacific (east of 170 degrees W) during 1950-2001. During this period, the strength of anticyclones gradually diminished and their frequency became more variable, while cyclones intensified in a discrete shift with deeper lows and further southerly trajectories occurring since the mid-1970s. These changes in synoptic transients translate into anomalously low seasonal mean SLP in the Aleutian Low, a low-level circulation anomaly consistent with the positive phase of the North Pacific Decadal Oscillation, with positive sea surface temperature (SST) anomalies along the west coast of North America and negative in the central North Pacific Ocean. A link between cyclonic/anticyclonic activity and tropical SST anomalies also exists, but this link only becomes significant after the mid-1970s, a period that coincides with more southerly cyclone trajectories. Southward excursions of mid-latitude cyclones during El Ni (n) over tildeo/positive NPO winters accomplish the northward advection of tropical air and discourage the southward penetration of polar air masses associated with transient anticyclones. Naturally, these changes in cyclonic/anticyclonic activity directly impact surface air temperatures, especially at night. We document these profound impacts on observed wintertime minimum temperatures over Western North America.
  • Fontaine, B. & Louvet, S.
    | Sudan-Sahel rainfall onset: Definition of an objective index, types of years, and experimental hindcasts
    | Journal of Geophysical Research-atmospheres, 2006 , 111 , D20103 , DOI 10.1029/2005JD007019 | Meteorology & Atmospheric Sciences | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : FRE2740 )
  • 2010.05.25
    Abstract:
    [ 1] Using rainfall estimates from the 5-day version of CPC Merged Analysis of Precipitation ( CMAP) and Global Precipitation Climatology Project data along with multiscale spatial key descriptors of atmospheric dynamics from National Center for Environmental Prediction/Department of Energy reanalysis 2 (NCEP/DOE), we first define a West African monsoon onset index to determine its successive dates of occurrence over the period 1979 - 2004 ( 28 - 29 June in mean with a standard deviation of 8.5 days). Then we focus on the three main types of time evolutions of that index at the moment of the monsoon onset in terms of precipitation, pressure, temperature, and winds at different levels to detect the most robust associated signals and select on the mid-May, mid-June period different sets of potential predictors for onset dates. Basically, late ( early) onsets are preceded by more ( less) rainfall southward to the equator by the end of May, then by a clear decrease ( increase) of the normal northward cross-equatorial gradient in mid-June. Finally, we present experimental cross-validated hindcasts of the dates of onset always based on four predictors using both reanalyzed atmospheric data and observed rainfall estimates. Accurate forecasting schemes are obtained, especially with CMAP rainfall ( time tendencies and cross-equatorial gradients) over the Gulf of Guinea. In this context the hindcasted series are highly significant when compared to observations (75% of explained common variance with the sole rainfall predictors) and can reach 82% of variance when a zonal wind descriptor of regional scale is added. Basically, a late ( early) onset is preceded by more ( less) rainfall southward to the equator by the end of May, then by a clear decrease ( increase) of the normal northward cross-equatorial gradient by mid-June.
  • Garrault, S.; Behr, T. & Nonat, A.
    | Formation of the C-S-H layer during early hydration of tricalcium silicate grains with different sizes
    | Journal of Physical Chemistry B, 2006 , 110 , 270-275 , DOI 10.1021/jp0547212 | Chemistry, Physical | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    Portland cement is a mixture of solid phases which all react with water. Tricalcium silicate (Ca3SiO5) is its main component and is often used in model systems to study cement hydration. It is generally recognized that setting and hardening of cement are due to the formation, by a dissolution-precipitation process, of a calcium silicate hydrate (C-S-H) on anhydrous grains during Ca3SiO5 hydration. The purpose of this paper is to study the effect of Ca3SiO5 particle size on the nucleation-growth process of C-S-H. An experimental study of the rate of hydration by using different grain sizes under controlled conditions has been performed. The experimental data have been compared with results obtained by numerical simulation based on a particles-aggregation model. The thickness of the C-S-H layer when the reaction becomes limited by diffusion has been then estimated.
  • Guillain, R.; Le Gallo, J. & Boiteux-Orain, C.
    | Changes in spatial and sectoral patterns of employment in Ile-de-France, 1978-97
    | Urban Studies, 2006 , 43 , 2075-2098 , DOI 10.1080/00420980600945203 | Environmental Studies; Urban Studies | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : UMR5118 )
  • 2010.05.25
    Abstract:
    This paper investigates the spatial distribution of employment in the region of Ile-de-France in 1978 and 1997. Exploratory spatial data analysis is used to identify employment centres and a sectoral analysis of the central business district (CBD) and sub-centres is performed. The results highlight a process of suburbanisation of employment in Ile-de-France between 1978 and 1997. A more polarised space emerges in 1997 than in 1978, with several employment centres specialised in different activities. Moreover, even if the spatial influence of the CBD declines over the study period, the CBD maintains its economic leadership by concentrating a large variety of high-order producer services.
  • Hughes, S.; Hayden, T. J.; Douady, C. J.; Tougard, C.; Germonpre, M.; Stuart, A.; Lbova, L.; Carden, R. F.; Hanni, C. & Say, L.
    | Molecular phylogeny of the extinct giant deer, Megaloceros giganteus
    | Molecular Phylogenetics and Evolution, 2006 , 40 , 285-291 , DOI 10.1016/j.ympev.2006.02.004 | Biochemistry & Molecular Biology; Evolutionary Biology; Genetics & Heredity | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
  • Lagosz, A.; Malolepszy, J. & Garrault, S.
    | Hydration of tricalcium aluminate in the presence of various amounts of calcium sulphite hemihydrate: Conductivity tests
    | Cement and Concrete Research, 2006 , 36 , 1016-1022 , DOI 10.1016/j.cemconres.2006.01.006 | Construction & Building Technology; Materials Science, Multidisciplinary | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    Hydration of calcium aluminate C(3)A (3CaO center dot Al2O3) in the presence of calcium sulphite hemihydrate (CaSO3 center dot 0.5H(2)O), with the molar ratio of substrates close to 1, produces the C(3)A center dot CaSO3 center dot 11H(2)O calcium monosulphite aluminate phase. Small amounts of calcium sulphite added to calcium aluminate (the ratio of CaSO3 center dot 0.5H(2)O/C(3)A equalling 0:1) change the rate of C(3)A hydration and influence the whole reaction. Reaction processes for various ratios of the C(3)A-CaSO3 center dot 0.5H(2)O mixture were examined in pure distilled water with a considerable amount of liquid W/S=38-50 (constant W/C(3)A). Processes in the liquid phase were monitored with conductivity equipment, and the XRD analysis was used to identify the phases precipitated during the examined reactions. (C) 2006 Elsevier Ltd. All rights reserved.
  • Loete, F.; Vuillemin, B.; Oltra, R.; Chaumont, D. & Bourillot, E.
    | Application of total internal reflexion fluorescence microscopy for studying pH changes in an occluded electrochemical cell: Development of a waveguide sensor
    | Electrochemistry Communications, 2006 , 8 , 1016-1020 , DOI 10.1016/j.elecom.2006.04.004 | Electrochemistry | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 ; UMR5613 )
  • 2010.05.25
    Abstract:
    A device for pH mapping derived from optical sensors similar to total internal reflection fluorescence microscopy (TIRFM) has been developed for future possible applications in the field of localized corrosion. The sensing principle is the increase of the fluorescent yield of the fluorescein with the pH of the medium. The basic principle of this sensor is based on the excitation of a fluorescent silica polymer film of nanometre dimensions, deposited by sol-gel method on a waveguiding layer. The total internal reflexion conditions creates an evanescent wave which interacts with the molecules trapped in the silica layer. A conventional microscope located above the sample collects the fluorescence emitted by this sensing layer. An original application of this type of sensor is proposed for studying the concentration profile of chemical species in an occluded electrochemical cell using a very. simple type of waveguide. This method takes advantages of the confinement and strong intensity of the field over a few hundred nanometres below the surface of the waveguide thus allowing local analysis and imaging of the concentration profiles of chemical species in this volume. (C) 2006 Elsevier B.V. All rights reserved.
  • Louvion, N.; Rahmani, A.; Seassal, C.; Callard, S.; Gerard, D. & de Fornel, F.
    | Near-field observation of subwavelength confinement of photoluminescence by a photonic crystal microcavity
    | Optics Letters, 2006 , 31 , 2160-2162 | Optics | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT ; SVT / Code(s) unite(s) : UMR5027 ; UMR5158 )
  • 2010.05.25
    Abstract:
    We present a direct, room-temperature near-field optical study of light confinement by a subwavelength defect microcavity in a photonic crystal slab containing quantum-well sources. The observations are compared with three-dimensional finite-difference time-domain calculations, and excellent agreement is found. Moreover, we use a subwavelength cavity to study the influence of a near-field probe on the imaging of localized optical modes. (c) 2006 Optical Society of America.
  • Nappi, A.; Brunet-Lecomte, P. & Montuire, S.
    | Intraspecific morphological tooth variability and geographical distribution: Application to the Savi's vole, Microtus (Terricola) savii (Rodentia, Arvicolinae)
    | Journal of Natural History, 2006 , 40 , 345-358 , DOI 10.1080/00222930600639249 | Biodiversity Conservation; Ecology | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    The Italian peninsula exhibits a very interesting and contrasted geographical pattern offering a good opportunity to study the relationship between morphological variability and environment. Savi's vole, Microtus (Terricola) savii, occupies the main part of the Italian peninsula from Ticino in the north southwards to Sicilia. The material studied comprises 55 local populations distributed over the whole Italian peninsula and characterising different types of environments and different types of conditions, e. g. natural or anthropic. Morphological variability is analysed using the first lower molar by taking 27 measures on the occlusal surface. The analysis has shown a clear morphological differentiation between north - central and south populations. Morphological tooth variability highlights two geographical scales. At a regional scale, morphological variability is clearly in relation to geography and consequently to the climate and environment. On the contrary, at a local scale, morphological variability can be due to the fragmentation of some particular areas leading to isolation of small populations characterised by different morphotypes.
  • Nikitin, A. V.; Champion, J. P. & Brown, L. R.
    | Preliminary analysis of CH3D from 3250 to 3700 cm(-1)
    | Journal of Molecular Spectroscopy, 2006 , 240 , 14-25 , DOI 10.1016/j.jms.2006.08.002 | Physics, Atomic, Molecular & Chemical; Spectroscopy | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    The infrared spectrum of CH3D from 3250 to 3700 cm(-1) was studied for the first time to assign transitions involving the nu(2) + nu(3), nu(2) + nu(5), nu(2) + nu(6), nu(3) + 2(nu 6) and 3 nu(6) vibrational states. Line positions and intensities were measured at 0.011 cm(-1) resolution using Fourier transform spectra recorded at Kitt Peak with isotopically enriched samples. Some 2852 line positions (involving over 900 upper state levels) and 874 line intensities were reproduced with RMS values of 0.0009 cm(-1) and 4.6%, respectively. The strongest bands were found to be nu(2) + nu(3) at 3499.7 cm(-1) and nu(2) + nu(6) at 3342.5 cm(-1) with integrated strengths, respectively, of 8.17 x 10(-20) and 2.44 x 10(-20) (cm(-1)/ molecule center dot cm(-2)) at 296 K (for 100% CH3D). The effective Hamiltonian was expressed in terms of irreducible tensor operators and adapted to symmetric top molecules. Its present configuration in the MIRS package permitted simultaneous consideration of the four lowest polyads of CH3D: the Ground State (G.S.), the Triad from 6.3 to 9.5 mu m, the Nonad from 3.1 to 4.8 mu m and now the Enneadecad (19 bands) from 2.2 to 3.1 mu m. The CH3D line parameters for this interval were calculated to create a new database for the 3 mu m region. (c) 2006 Elsevier Inc. All rights reserved.
  • Passian, A.; Lereu, A. L.; Ritchie, R. H.; Meriaudeau, F.; Thundat, T. & Ferrell, T. L.
    | Surface plasmon assisted thermal coupling of multiple photon energies
    | Thin Solid Films, 2006 , 497 , 315-320 , DOI 10.1016/j.tsf.2005.09.016 | Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    A novel optical effect can be observed in a thin gold foil due to the excitation of surface plasmons which permits a form of all-optical modulation at low pulse rates. Modulated excitation of surface plasmons by infrared photons is shown to couple to several beams at visible-photon energies. The coupling is manifested by the observation of the visible photons being pulsed by the action of the infrared pulses, and by the far field diffraction of the visible beams into concentric rings. When each visible beam also excites surface plasmons, then a quadratic dependence of the visible photon power upon the infrared incident power is measured. The decay of surface plasmons is implicated as the primary cause of thermally induced changes in the foil. The thermal effects dissipate in sufficiently small times so that operation up to the kilohertz range in pulse repetition frequency is obtained. (c) 2005 Elsevier B.V. All rights reserved.
  • Pohl, B. & Camberlin, P.
    | Influence of the Madden-Julian Oscillation on East African rainfall: II. March-May season extremes and interannual variability
    | Quarterly Journal of the Royal Meteorological Society, 2006 , 132 , 2541-2558 , DOI 10.1256/qj.05.223 | Meteorology & Atmospheric Sciences | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : FRE2740 )
  • 2010.05.25
    Abstract:
    The Madden-Julian Oscillation (MJO) was shown in Part I to have a significant impact on both East African rainy seasons at pentad time-scale. The case of the 'long rains' (March-May) is further examined by considering both shorter (daily) and longer (interannual) time-scales. Based on composite analyses, extreme daily rainfall events in the Highland (west) and in the coastal (east) regions of Equatorial East Africa (Kenya and Tanzania) are extracted. Low-level westerly wind anomalies are seen to accompany wet events in the west and easterly ones in the east. These opposite circulation anomalies preferentially occur at distinct phases of the MJO, which indicates that the latter has a major influence on rainfall at the daily time-scale. However, this influence undergoes significant year-to-year variations. It is found that the common variance between smoothed rainfall time series (5-day low-pass filter) and MJO indices varies from 5% to 53% in the Highland region. Significantly lower air temperatures in the upper troposphere are recorded during the MJO cycles that present the highest common variance with East African rainfall. Such a cooling is seen to be related to the Kelvin wave propagation in the upper layers which favours upward atmospheric motion over the region. At the interannual time-scale, fluctuations in MJO amplitude contribute to the March-May rainfall variability, and 44% of the March-May seasonal rainfall variance in the 1979-95 period in East Africa is explained by this parameter. Years of high MJO amplitude are characterized by earlier onset of the rains, and higher seasonal amounts.
  • Ulenikov, O. N.; Bekhtereva, E. S.; Bulavenkova, A. S.; Leroy, C.; Jerzembeck, W. & Burger, H.
    | High resolution study of AsHD2: Ground state and the three bending fundamental bands v(3), v(4), and v(6)
    | Journal of Molecular Spectroscopy, 2006 , 240 , 102-111 , DOI 10.1016/j.jms.2006.09.005 | Physics, Atomic, Molecular & Chemical; Spectroscopy | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    For the first time the infrared spectrum of the AsHD2 molecule has been measured in the region of the bending fundamental bands v(3), v(4), and v(6) on a Fourier transform spectrometer with a resolution of 0.0024 cm(-1) and analyzed. More than 5500 transitions with J(max) = 26 have been assigned and used both to obtain "ground state combination differences" and for the determination of upper state ro-vibrational energies of the triad (001000), (000100), and (000001). Rotational parameters including centrifugal distortion coefficients up to octic terms of the ground vibrational state were calculated by fitting more than 500 "ground state combination differences" with J(max) and K-a(max) = 21. The obtained set of 24 parameters provides a rms-deviation of 0.00011 cm(-1). The upper energies were fitted with 52 parameters of an effective Hamiltonian which takes into account strong resonance interactions between all vibrational states of the triad (001000), (000100), and (000001). The rms-deviation for the energy levels considered in the fit is 0.00014 cm(-1). (c) 2006 Elsevier Inc. All rights reserved.
  • Weeber, J. C.; Baudrion, A. L.; Bouhelier, A.; Bruyant, A.; Francs, G. C. D.; Zia, R. & Dereux, A.
    | Efficient surface plasmon field confinement in one-dimensional crystal line-defect waveguides
    | Applied Physics Letters, 2006 , 89 , 211109 , DOI 10.1063/1.2392998 | Physics, Applied | cited 4 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    The authors operate a near-field optical microscope to investigate surface plasmon polariton (SPP) propagation along linear waveguides opened into one-dimensional (1D) plasmonic crystals, i.e., crystals featuring a single lattice plane orientation. They show that efficient SPP field confinement can be achieved by this type of waveguide although no band gap exists in the direction perpendicular to the waveguide axis. From computed wave-vector diagrams, they show that 1D plasmonic crystals can open a wide range of prohibited propagation directions preventing from a significant coupling of the waveguide SPP modes with the crystal Bloch modes. Finally, the authors demonstrate that the field distributions of the guided SPP modes can be qualitatively understood from simple Ewald constructions. (c) 2006 American Institute of Physics.
  • Antinolo, A.; Dorado, I.; Fajardo, M.; Garces, A.; Kubicki, M. M.; Lopez-Mardomingo, C.; Otero, A. & Prashar, S.
    | Synthesis and reactivity of new mono- and dinuclear niobium and tantalum imido complexes: X-ray crystal structure of [Ta(eta(5)-C5H4SiMe3)Cl-2=NC6Me4-4-(N(SiMe3)(2))]
    | Journal of Organometallic Chemistry, 2006 , 691 , 1361-1368 , DOI 10.1016/j.jorganchem.2005.12.016 | Chemistry, Inorganic & Nuclear; Chemistry, Organic | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
  • Baril, J. L. & Pallo, J. M.
    | The phagocyte lattice of dyck words
    | Order-a Journal On the Theory of Ordered Sets and Its Applications, 2006 , 23 , 97-107 , DOI 10.1007/s11083-006-9034-0 | Mathematics | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    We introduce a new lattice structure on Dyck words. We exhibit efficient algorithms to compute meets and joins of Dyck words.
  • Bonnard, B.; Caillau, J. B. & Dujol, R.
    | Energy minimization of single input orbit transfer by averaging and continuation
    | Bulletin Des Sciences Mathematiques, 2006 , 130 , 707-719 , DOI 10.1016/j.bulsci.2006.03.005 | Mathematics, Applied | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    This article deals with the transfer between Keplerian coplanar orbits using low propulsion. We focus on the energy minimization problem and compute the averaged system, proving integrability and relating the corresponding trajectories to a three-dimensional Riemannian problem that is analyzed in details. The geodesics provide approximations of the extremals of the energy minimization problem and can be used in order to evaluate the optimal trajectories of the time optimal and the minimization of the consumption problems with continuation methods. In particular, minimizing trajectories for transfer towards thegeostationary orbit can be approximated in suitable coordinates by straight lines. (c) 2006 Elsevier Masson SAS. All rights reserved.
  • Boudon, V.; Rotger, M.; Zvereva-Loete, N. & Loete, M.
    | The SO2F2 quasi-spherical top: Correspondence between tensorial and Watson's formalisms
    | Journal of Molecular Structure, 2006 , 780-81 , 124-133 , DOI 10.1016/j.molstruc.2005.05.056 | Chemistry, Physical | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    The SO2F2 quasi-spherical top molecule with C-2v symmetry is considered as a distorted spherical top deriving from the SO42- tetrahedral ion. We present here a detailed correspondence between the tensorial formalism using the T-d superset of C-2v reorientation and the usual Hamiltonian of Watson. We have also performed ab initio calculations in order to determine the centrifugal distorsion constants in the vibrational ground state. (c) 2005 Elsevier B.V. All rights reserved.
  • Chaperon, M.; De Verdeire, M. K. C. & De Medrano, S. L.
    | More compact invariant manifolds appearing in the non-linear coupling of oscillators
    | Comptes Rendus Mathematique, 2006 , 342 , 301-305 , DOI 10.1016/j.crma.2005.12.032 | Mathematics | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    Near partially elliptic rest points of generic families of vector fields or transformations, many types of normally hyperbolic invariant compact manifolds can appear, diffeomorphic to intersections of quadrics.
  • Cortez, M. I.
    | Zd Toeplitz arrays
    | Discrete and Continuous Dynamical Systems, 2006 , 15 , 859-881 | Mathematics, Applied; Mathematics | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    pIn this paper we give a definition of Toeplitz sequences and odometers for Z(d) actions for d >= 1 which generalizes that in dimension one. For these new concepts we study properties of the induced Toeplitz dynamical systems and odometers classical for d = 1. In particular, we characterize the Z(d) - regularly recurrent systems as the minimal almost 1-1 extensions of odometers and the Z(d)-Toeplitz systems as the family of sub shifts which are regularly recurrent.
  • Cosquer, N.; Le Gall, B.; Conan, F.; Kerbaol, J. M.; Sala-Pala, J.; Kubicki, M. M. & Vigier, E.
    | Carbonylmolybdenum complexes with di(imino)pyridine and related ligands: Reduction of a di(imino)pyridine to an aminoiminopyridine system under mild conditions
    | Inorganica Chimica Acta, 2006 , 359 , 4311-4316 , DOI 10.1016/j.ica.2006.06.005 | Chemistry, Inorganic & Nuclear | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    The reactions of [Mo(CO)(6)] towards a 2,6-di(imino)pyridine L-1 and related ligands were studied. The reaction with L-1 afforded two new complexes, [Mo(CO)(4)L-1] (1) and [Mo(CO)(4)L-2] (2), where L-2 is the 2-amino-6-iminopyridine ligand arising from the hydrogenation of one imine function of L-1; similar reaction with a 2-acetyl-6-iminopyridine ligand L-3 afforded [Mo(CO)(4)L-3] (3). Compounds 1, 2 and 3 have been fully characterised by IR, H-1 NMR and X-ray crystallography; they present a metal ion in a pseudo-octahedral environment, the three organic ligands acting with bidentate N-2 coordination modes. One of the imine functions in 1, the amine function in 2, and the ketone function in 3 are uncoordinated. (c) 2006 Elsevier B.V. All rights reserved.
  • Cugnet, C.; Lucas, D.; Lemaitre, F.; Collange, E.; Soldera, A.; Mugnier, Y. & Harvey, P. D.
    | Unexpected reaction of the unsaturated cluster host and catalyst [Pd-3(mu(3)-CO)(dppm)(3)](2+) with the hydroxide ion: Spectroscopic and kinetic evidence of an inner-sphere mechanism
    | Chemistry-a European Journal, 2006 , 12 , 8386-8395 , DOI 10.1002/chem.200600395 | Chemistry, Multidisciplinary | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    The title cluster, [Pd-3(mu 3CO)(dppm)(3)](2+) (dppm=bis(diphenylphosphino)methane), reacts with one equivalent of hydroxide anions (OH-), from tetrabutylammonium hydroxide (Bu4NOH), to give the paramagnetic [Pd-3(mu(3)-CO)(dppm)(3)](+) species. Reaction with another equivalent of OH- leads to the zero-valent compound [Pd-3(mu(3)-CO)(dppm)(3)](0). From electron paramagnetic resonance analysis of the reaction medium using the spin-trap agent 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), the 2-tetrahydrofuryl or methyl radicals, deriving from the tetrahydrofuran (THF) or dimethyl sulfoxide (DMSO) solvent, respectively, were detected. For both [Pd-3(mu(CO)-C-3)-(dppm)(2)](2+) and [Pd-3(mu(3)-CO)(dppm)(3)](+), the mechanism involves, in a first equilibrated step, the formation of a hydroxide adduct, [Pd-3(mu(3)-CO)(dppm)(3)-(OH)]((n-1)+) (n = 1, 2), which reacts irreversibly with the solvent. The kinetics were resolved by means of stoppedflow experiments and are consistent with the proposed mechanism. In the presence of an excess of Bu4NOH, an electrocatalytic process was observed with modest turnover numbers (7-8). The hydroxide adducts [Pd-3(mu(3)-CO)(dppm)(3)(OH)]((n-1)+) (n=1, 2), which bear important similarities to the well-known corresponding halide adducts [Pd-3(mu 3CO)(dppm)(3)(mu(3)-X)](n) (X = Cl, Br, I), have been studied by using density functional theory (DFT). Although the optimised geometry for the cluster in its +2 and 0 oxidation states (i.e., cation and anion clusters, respectively) is the anticipated W-OH form, the paramagnetic species, [Pd-3(mu(3)-CO)- (dppm)(3)(OH)](0), shows a mu(2)-OH form; this suggests an important difference in electronic structure between these three species.
  • Dumortier, F. & Roussarie, R.
    | Abelian integrals and limit cycles
    | Journal of Differential Equations, 2006 , 227 , 116-165 , DOI 10.1016/j.jde.2005.08.015 | Mathematics | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    The paper deals with generic perturbations from a Hamiltonian planar vector field and more precisely with the number and bifurcation pattern of the limit cycles. In this paper we show that near a 2-saddle cycle, the number of limit cycles produced in unfoldings with one unbroken connection, can exceed the number of zeros of the related Abelian integral, even if the latter represents a stable elementary catastrophe. We however also show that in general, finite codimension of the Abelian integral leads to a finite upper bound on the local cyclicity. In the treatment, we introduce the notion of simple asymptotic scale deformation. (c) 2005 Elsevier Inc. All rights reserved.
  • El Hammari, L.; Laghzizil, A.; Saoiabi, A.; Barboux, P.; Meyer, M.; Brandes, S. & Guilard, R.
    | Some factors affecting the removal of lead(II) ions from aqueous solution by porous calcium hydroxyapatite: Relationships between surface and adsorption properties
    | Adsorption Science & Technology, 2006 , 24 , 507-516 | Chemistry, Applied; Chemistry, Physical; Engineering, Chemical | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    A porous hydroxyapatite (p-HAp) was prepared and employed for the removal of lead(H) ions at different concentrations from aqueous solution to determine the adsorption properties of p-HAp and compare them with those of a commercial hydroxyapatite (CAp) sample. The kinetic data obtained indicated that the adsorption performances of the adsorbents depended both on their specific surface area and crystallinity. Complexation of the Pb(II) ion on the adsorbent surface favoured the dissolution of hydroxyapatites characterized by a Ca/Pb molar ratio in the 0.85-1.5 range. The maximum adsorption capacity of p-Hap for Pb(II) ions at 30 +/- 2 degrees C was 2.30 mmol/g relative to 1.38 mmol/g for the commercial compound Cap at the same temperature. The higher capacity of p-HAp was explained in terms of its porosity and crystallinity. The Pb(II) ions sorption results could be modelled by the Langmuir and Freundlich isotherms.
  • Fatome, J.; Pitois, S.; Tchofo-Dinda, P.; Erasme, D. & Millot, G.
    | Comparison of conventional and dense dispersion managed systems for 160 Gb/s transmissions
    | Optics Communications, 2006 , 260 , 548-553 , DOI 10.1016/j.optcom.2005.11.012 | Optics | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    In this paper, we carry out, by numerical simulations and experiments on recirculating loop.. a comparative analysis of the performances of two types of dispersion management techniques for 160 Gb/s transmission systems, which correspond to short-period dispersion maps (dense dispersion management) and long-period dispersion maps (conventional dispersion management), respectively. We show that the dense dispersion management system suffers performance degradation by the effects of polarization mode dispersion (PMD) and fiber splicing losses, in a more dramatic manner than in the system with long-period map. We experimentally find that, at constant PMD, dense dispersion managed system permits to achieve a transmission distance that is twice larger than that obtained with the conventional dispersion management; however, the polarization mode dispersion significantly reduces the gap between the transmission performances of the two types of systems. (c) 2005 Elsevier B.V. All rights reserved.
  • Gauthier, J. P. & Zakalyukin, V.
    | On the motion planning problem, complexity, entropy, and nonholonomic interpolation
    | Journal of Dynamical and Control Systems, 2006 , 12 , 371-404 , DOI 10.1007/s10450-006-0005-y | Automation & Control Systems; Mathematics, Applied | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    We consider the sub-Riemannian motion planning problem defined by a sub-Riemannian metric (the robot and the cost to minimize) and a non-admissible curve to be epsilon-approximated in the sub-Riemannian sense by a trajectory of the robot. Several notions characterize the epsilon-optimality of the approximation: the "metric complexity" MC and the "entropy" E (Kolmogorov-Jean). In this paper, we extend our previous results. 1. For generic one-step bracket-generating problems, when the corank is at most 3, the entropy is related to the complexity by E = 2 pi MC. 2. We compute the entropy in the special 2-step bracket-generating case, modelling the car plus a single trailer. The epsilon-minimizing trajectories (solutions of the '"epsilon-nonholonomic interpolation problem"), in certain normal coordinates, are given by Euler's periodic inflexional elastica. 3. Finally, we show that the formula for entropy which is valid up to corank 3 changes in a wild case of corank 6: it has to be multiplied by a factor which is at most 3/2.
  • Jacquot-Rousseau, S.; Schmitt, G.; Khatyr, A.; Knorr, M.; Kubicki, M. M.; Vigier, E. & Blacque, O.
    | Reactivity of 4,4-dichloro-1,1-diphenyl-2-azabutadiene towards alkoxides and thiolates: Synthesis of functionalised pi-conjugated 2-azabutadienes and unexpected 1,4-thiazine formation
    | European Journal of Organic Chemistry, 2006 , 1555-1562 , DOI 10.1002/ejoc.200500538 | Chemistry, Organic | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    Treatment of 4,4-dichloro-1,1-diphenyl-2-azabuta-1,3-diene [Cl2C=C(H)-N=CPh2] (1) with excess sodium isopropylthiolate or sodium thiophenolate in DMF yielded the 2-azabutadiene derivatives (RS)(2)C=C(H)-N=CPh2 (2) (2a R = iPr; 2b R = Ph). Nucleophilic attack of the sodium salt of ethyl thioglycolate on I afforded as the sole product the six-membered heterocyclic compound ethyl 2-ethoxycarbonylmethylthio-5,5diphenyl-5,6-dihydro-4H-1,4-thiazine-6-car boxylate (5). The reaction is initiated by substitution of the two vinyl-bound chloro substituents to give (EtO(O=)CCH2S)(2)C=C(H)-N=CPh2 (2c) as intermediate. A mechanism that accounts for the subsequent cyclisation reaction is proposed. The 2-azabutadiene derivative (PhO)(2)C=C(H)-N=CPh2 (7) was obtained by the reaction of 1 with sodium phenolate. The regioselectivity of the incoming nucleophile is roughly correlated with its hardness/softness in accord with Pearson's HSAB principle. The molecular structures of 2a,b, 5 and 7 were determined by single-crystal X-ray diffraction. (c) Wiley-VCH Verlag GmbH & Co.
  • Ji, G.; Goran, D.; Bernard, F.; Grosdidier, T.; Gaffet, E. & Munir, Z. A.
    | Structure and composition heterogeneity of a FeAl alloy prepared by one-step synthesis and consolidation processing and their influence on grain size characterization
    | Journal of Alloys and Compounds, 2006 , 420 , 158-164 , DOI 10.1016/j.jallcom.2005.10.058 | Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    This paper aims to characterize a bulk dense FeAl (47 at.%) alloy synthesized and consolidated by one-step current-activated pressure-assisted processing of nanocrystalline elemental powders. The end-product was analyzed using a combination of scanning (SEM) and transmission electron microscopies (TEM), electron back-scattering diffraction (EBSD) as well as electron probe microanalysis (EPMA). Special attention was paid to verify the grain size (32-89 nm) previously determined by X-ray diffraction peak profile analysis. It has been found that this material displays equiaxed grains (0.8-4 mu m in size) and contains limited structural defects like subgrains and dislocations. The EPMA result reveals that a variability in Al content (36-47 at.%) is present within the synthesized FeAl phase. Thus, the local variation of lattice parameters resulting from this heterogeneity accounts for the broadening of X-ray diffraction peaks instead of the common idea that the broadening is due to the small grain size. The formation mechanisms of the structure and the composition heterogeneity are also discussed and related to the combustion reaction process. (c) 2005 Elsevier B.V. All rights reserved.
  • Jourani, A.
    | Weak regularity of functions and sets in Asplund spaces
    | Nonlinear Analysis-theory Methods & Applications, 2006 , 65 , 660-676 , DOI 10.1016/j.na.2005.09.031 | Mathematics, Applied; Mathematics | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    In this paper, we study a new concept of weak regularity of functions and sets in Asplund spaces. We show that this notion includes prox-regular functions, functions whose subdifferential is weakly submonotone and amenable functions in infinite dimension. We establish also that weak regularity is equivalent to Mordukhovich regularity in finite dimension. Finally, we give characterizations of the weak regularity of epi-Lipschitzian sets in terms of their local representations. (c) 2005 Elsevier Ltd. All rights reserved.
  • Krawiec, H.; Vignal, V. & Banas, J.
    | Macroscopic and local electrochemical studies of austempered ductile iron in perchlorate solutions
    | Journal of the Electrochemical Society, 2006 , 153 , B231-B237 , DOI 10.1149/1.2197635 | Electrochemistry; Materials Science, Coatings & Films | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    The corrosion behavior of austempered ductile iron (ADI) in alkaline environment has been investigated at the microscale by means of the electrochemical microcell technique, surface analysis methods, and at the macroscale using classical electrochemical techniques. Local electrochemical investigations have revealed that the matrix (ausferrite), far from spheres, undergoes passivation in 1 M NaClO4, pH 10 solution within a wide potential range, from the corrosion potential (of about - 280 mV/SCE) until 800 mV/SCE. Surface observations combined with local electrochemical analysis have shown that corrosion of ADI first occurs in the close vicinity of some graphite spheres and then around oxide inclusions. The oxidized regions are richer in oxygen than the matrix located far from spheres. X-ray photoelectron spectroscopy analysis has revealed that the electrochemical dissolution of ADI in 1 M NaClO4, pH 10, leads to the formation of corrosion products containing mainly iron oxides and hydroxide. (c) 2006 The Electrochemical Society.
  • Lagrue, C. & Bollache, L.
    | Effects of temperature on persistence times of native and invasive gammarid species in the stomachs of Cottus gobio
    | Journal of Fish Biology, 2006 , 68 , 318-322 , DOI 10.1111/j.1095-8649.2005.00901.x | Fisheries; Marine & Freshwater Biology | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Gastric lavage was used to investigate the effects of temperature on persistence time of two amphipod species, one native Gammarus pulex and one invasive Gammarus roeseli, in the stomachs of bullhead Cottus gobio. Persistence time was strongly influenced by temperature and prey type, such that G. pulex species degraded faster than G. roeseli. (c) 2006 The Fisheries Society of the British Isles.
  • Lefebvre, B.; Eble, G. J.; Navarro, N. & David, B.
    | Diversification of atypical Paleozoic echinoderms: a quantitative survey of patterns of stylophoran disparity, diversity, and geography
    | Paleobiology, 2006 , 32 , 483-508 | Biodiversity Conservation; Ecology; Evolutionary Biology; Paleontology | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    The analysis of morphological disparity and of morphospace occupation through the macroevolutionary history of clades is now a major research program in paleobiology, and increasingly so in organismal and comparative biology. Most studies have focused on the relationship between taxonomic diversity and morphological disparity, and on ecological or developmental controls. However, the geographic context of diversification has remained understudied. Here we address geography quantitatively. Diversity, disparity, and paleogeographic dispersion are used to describe the evolutionary history of an extinct echinoderm clade, the class Stylophora (cornutes, mitrates), from the Middle Cambrian to the Middle Devonian (about 128 Myr subdivided into 12 stratigraphic intervals). Taxonomic diversity is estimated from a representative sample including 73.3% of described species and 92.4% of described genera. Stylophoran morphology is quantified on the basis of seven morphometric parameters derived from image analysis of homologous skeletal regions. Three separate principal coordinates analyses (PCO) are performed for thecal outlines, plates from the lower thecal surface, and plates from the upper thecal surface, respectively. PCO scores from these three separate analyses are then used as variables for a single, global, meta-PCO. For each time interval, disparity is calculated as the sum of variance in the multidimensional morphospace defined by the meta-PCO axes. For each time interval, a semiquantitative index of paleogeographic dispersion is calculated, reflecting both global (continental) and local (regional) aspects of dispersion. Morphospace occupation of cornutes and mitrates is partly overlapping, suggesting some morphologic convergences between the two main stylophoran clades, probably correlated to similar modes of life (e.g., symmetrical cornutes and primitive mitrocystitids). Hierarchical clustering allowed the identification of three main morphological sets (subdivided into 11 subsets) within the global stylophoran morphospace. These morphological sets are used to analyze the spatiotemporal variations of disparity. The initial radiation of stylophorans is characterized by a low diversity and a rapid increase in disparity (Middle Cambrian-Tremadocian). The subsequent diversification involved filling and little expansion of morphospace (Arenig-Middle Ordovician). Finally, both stylophoran diversity and disparity decreased relatively steadily from the Late Ordovician to the Middle Devonian, with the exception of a second (lower) peak in the Early Devonian. Such a pattern is comparable to that of other Paleozoic marine invertebrates such as blastozoans and orthid brachiopods. During the Lower to Middle Ordovician, the most dramatic diversification of stylophorans took place with a paleogeographic dispersion essentially limited to the periphery of Gondwana. In the Late Ordovician, stylophorans steadily extended toward lower paleolatitudes, and new environmental conditions, where some of them radiated, and finally survived the end-Ordovician mass extinction (e.g., anomalocystitids). This pattern of paleobiogeographic dispersion is comparable to that of other examples of Paleozoic groups of marine invertebrates, such as bivalve mollusks.
  • Michelucci, D. & Foufou, S.
    | Interval-based tracing of strange attractors
    | International Journal of Computational Geometry & Applications, 2006 , 16 , 27-39 | Computer Science, Theory & Methods; Mathematics, Applied | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    The method described here relies on interval arithmetic and graph theory to compute guaranteed coverings of strange attractors like Henon attractor. It copes with infinite intervals, using either a geometric method or a new directed projective interval arithmetic.
  • Minghelli-Roman, A.; Polidori, L.; Mathieu-Blanc, S.; Loubersac, L. & Cauneau, F.
    | Spatial resolution improvement by merging MERIS-ETM images for coastal water monitoring
    | Ieee Geoscience and Remote Sensing Letters, 2006 , 3 , 227-231 , DOI 10.1109/LGRS.2005.861699 | Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    The Medium Resolution Imaging Spectrometer (MERIS) launched in March 2002 and has been providing images since June 2002. Before its launch, we had implemented a method to improve its resolution by merging its images with Landsat Enhanced Thematic Mapper images in order to preserve the best characteristics of the two images (spatial, spectral, temporal). We now present the results of this method for real MERIS images (level 1b and 2) in a coastal area. The robustness of the method is studied as well as the influence of the delay between the acquisitions of the two images.
  • Moreau, J.; Arruego, X.; Benrey, B. & Thiery, D.
    | Differences in nutritional quality of parts of Vitis vinifera berries affect fitness of the European grapevine moth
    | Entomologia Experimentalis Et Applicata, 2006 , 119 , 93-99 | Entomology | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    The European grapevine moth, Lobesia botrana (Denis & Schiffermuller) (Lepidoptera: Tortricidae), is a major grapevine pest in Europe. The larva is polyphagous and able to develop on more than 25 plant species, several of them being more suitable than Vitaceae for the fitness of L. botrana. Larvae normally eat the pulp of the berry, but may also consume the seeds according to the development stage of the berry and the larval density per bunch. Understanding the effect on individual fitness of such feeding behaviour is important to assess how suitable the different berry tissues are for this insect. We offered to the larvae either entire berries, seeds, or pulp with skin of the variety Vitis vinifera cv. 'Cabernet Sauvignon' as larval food in order to assess several life history traits from egg hatching to adult death. Two control groups were raised on semisynthetic diets, offering a low (no plant material) or a higher (with corn flour) nutritive value medium. The larvae performed differently when fed on diets containing different parts of berries. The larvae fed on a diet containing grape berry seeds had a prolonged development time and showed higher mortality. The females emerging from these larvae had a lower fecundity and mating success than the females emerging from larvae fed on diets containing other parts of the berries. However, their longevity was greater in comparison to the other groups. We conclude that seeds of Cabernet Sauvignon are not toxic to larvae but affect the reproductive life history traits in L. botrana.
  • Pecou, E.; Maass, A.; Remenik, D.; Briche, J. & Gonzalez, M.
    | A mathematical model for copper homeostasis in Enterococcus hirae
    | Mathematical Biosciences, 2006 , 203 , 222-239 , DOI 10.1016/j.mbs.2006.04.009 | Biology; Mathematical & Computational Biology | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT ; SVT / Code(s) unite(s) : UMR5584 ; ERITM207 )
  • 2010.05.25
    Abstract:
    Copper is an essential micronutrient for life. It is required by a wide range of species, from bacteria to yeast, plants and mammals including humans. To prevent the consequences of the excess or deficit of copper, living organisms have developed molecular mechanisms that regulate the uptake, efflux, storage and use of the metal. However, the limits of homeostatic regulation are not known. Here, we take advantage of a simple biological mechanism involved in copper metabolism of Enterococcus hirae, to explore how the regulation is achieved by using a set of four proteins codified in the cop operon: two P-type ATP-ases copper transporters, one copper chaper-one and one Cu-response transcription factor. We propose a mathematical model, based on differential equations and the power-law formalism (see M.A. Savageau, Chaos 11(1) (2001) 142-159), for the behavior of the cop operon and we show that homeostasis is a result of transient dynamics. The results derived from the mathematical model allow to measure qualitatively the adaptability of the system to its environment. This detailed model has been possible thanks to the available experimental biological information provided in a sequence of recent works by Solioz and co-workers. (c) 2006 Elsevier Inc. All rights reserved.
  • Perruchet, P.; Rey, A.; Hivert, E. & Pacton, S.
    | Do distractors interfere with memory for study pairs in associative recognition?
    | Memory & Cognition, 2006 , 34 , 1046-1054 | Psychology, Experimental | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    In an associative recognition task, distractors generally consist of a rearrangement of the items composing the study pairs. This makes it possible that processing the distractors generates retroactive interference on memory for the study pairs. In Experiment 1, we explored this possibility in a yes/no recognition test concerning previously learned arbitrary associations between visual symbols and auditory syllables. Rearranged pairs had a deleterious impact on the accuracy and the speed of responses to related correct pairs. This effect did not vary as a function of the number of training blocks, and furthermore, in Experiment 2, the same effect was observed for overlearned small multiplication facts. These results suggest that exposure to potentially confounding information generates interference even if this information is known to be incorrect. Some implications are outlined, especially with regard to the widespread use of multiple-choice tests in knowledge evaluation.
  • Ponton, F.; Lefevre, T.; Lebarbenchon, C.; Thomas, F.; Loxdale, H. D.; Marche, L.; Renault, L.; Perrot-Minnot, M. J. & Biron, D. G.
    | Do distantly related parasites rely on the same proximate factors to alter the behaviour of their hosts?
    | Proceedings of the Royal Society B-biological Sciences, 2006 , 273 , 2869-2877 , DOI 10.1098/rspb.2006.3654 | Biology; Ecology; Evolutionary Biology | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Phylogenetically unrelated parasites often increase the chances of their transmission by inducing similar phenotypic changes in their hosts. However, it is not known whether these convergent strategies rely on the same biochemical precursors. In this paper, we explored such aspects by studying two gammarid species (Gammarus insensibilis and Gammarus pulex; Crustacea: Amphipoda: Gammaridae) serving as intermediate hosts in the life cycle of two distantly related parasites: the trematode, Microphallus papillorobustus and the acanthocephalan, Polymorphus minutus. Both these parasite species are known to manipulate the behaviour of their amphipod hosts, bringing them towards the water surface, where they are preferentially eaten by aquatic birds (definitive hosts). By studying and comparing the brains of infected G. insensibilis and G. pulex with proteomics tools, we have elucidated some of the proximate causes involved in the parasite-induced alterations of host behaviour for each system. Protein identifications suggest that altered physiological compartments in hosts can be similar (e.g. immunoneural connexions) or different (e.g. vision process), and hence specific to the host-parasite association considered. Moreover, proteins required to alter the same physiological compartment can be specific or conversely common in both systems, illustrating in the latter case a molecular convergence in the proximate mechanisms of manipulation.
  • Rachuri, S.; Han, Y. H.; Foufou, S.; Feng, S. C.; Roy, U.; Wang, F. J.; Sriram, R. D. & Lyons, K. W.
    | A model for capturing product assembly information
    | Journal of Computing and Information Science In Engineering, 2006 , 6 , 11-21 , DOI 10.1115/1.2164451 | Computer Science, Interdisciplinary Applications; Engineering, Manufacturing | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    The important issue of mechanical assemblies has been a subject of intense research over the past several years. Most electromechanical products are assemblies of several components, for various technical as well as economic reasons. This paper provides all object-oriented definition of all assembly model called the Open Assembly Model (OAM) and defines all extension to the NIST Core Product Model (NIST-CPM). The assembly model represents the function, form, and behavior of the assembly and defines both a system level conceptual model and associated hierarchical relationships. The model provides a way for tolerance representation and propagation, kinematics representation, and engineering analysis at the system level. The assembly model is open so as to enable plug-and-play with various applications, such as analysis (FEM, tolerance, assembly), process planning, and virtual assembly (using VR techniques). With the advent of the Internet more and more products are designed and manufactured globally in a distributed and collaborative environment. The class structure defined in OAM call be used by designers to collaborate in such all environment. The proposed model includes both assembly as a concept and assembly as a data structure. For the latter it uses STEP. The OAM together with CPM call be used to capture the assembly evolution from the conceptual to the detailed design stages. It is expected that the proposed OAM will enhance the assembly information content in the STEP standard. A case study example is discussed to explain the Usecase analysis of the assembly model.
  • Villette, S.; Cointault, F.; Chopinet, B. & Paindavoine, M.
    | Optimizing Hough transform for fertilizer spreading optical control
    | Optical Engineering, 2006 , 45 , 027006 , DOI 10.1117/1.2173649 | Optics | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    In Europe, centrifugal spreading is a widely used method for agricultural soil fertilization. In this broadcasting method, fertilizer particles fall onto a spinning disk, are accelerated by a vane, and afterward are ejected into the field. To predict and control the spread pattern, a low-cost, embeddable technology adapted to farm implements must be developed. We focus on obtaining the velocity and the direction of fertilizer granules when they begin their flight by means of a simple imaging system. We first show that the outlet angle of the vane is a bounded value and that its measurement provides the outlet velocity of the particle. Consequently, a simple camera unit is used in the vicinity of the spinning disk to acquire digital images on which trajectory streaks are recorded. Information is extracted using the Hough transform, which is specifically optimized to analyze these streaks and to measure the motion of the particles. The optimization takes into account prior mechanical knowledge and tackles the problem of Hough space quantization. The method is assessed on various simulated images and is used on real spreading images to characterize fertilizer particle trajectories. (c) 2006 Society of Photo-Optical Instrumentation Engineers.
  • Willemart, R. H.; Farine, J. P.; Peretti, A. V. & Gnaspini, P.
    | Behavioral roles of the sexually dimorphic structures in the male harvestman, Phalangium opilio (Opiliones, Phalangiidae)
    | Canadian Journal of Zoology-revue Canadienne De Zoologie, 2006 , 84 , 1763-1774 , DOI 10.1139/Z06-173 | Zoology | cited 3 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5548 )
  • 2010.05.25
    Abstract:
    In various animal species, male sexual dimorphic characters may be used during intrasexual contests as ornaments to attract females, or to hold them before, during, or after copulation. In the well-known harvestman, Phalangium opilio L., 1758, the behavioral functions of these male sexually dimorphic structures have never been studied in detail. Therefore, in addition to a morphometric study, 21 male contests and 43 sexual interactions were analyzed. Our observations revealed that during contests, the male cheliceral horns form a surface by which the contestants use to push each other face-to-face while rapidly tapping their long pedipalps against the pedipalps of the opponent, occasionally twisting the opponent's pedipalp. Scanning electron micrographs revealed contact mechanoreceptors on the pedipalp that would detect the intensity-frequency of contact with the contender's pedipalp. Larger males won almost all contests, whereas the loser rapidly fled. During sexual interactions, the longer pedipalps of the male held legs IV of the female, whereas males with shorter pedipalps held the female by legs III. No contact with the male pedipalps and chelicerae by the females was visible before, during, or after copulation. Soon after copulating, males typically bent over the female, positioning their cheliceral horns against the females's dorsum. Consequently, Our data show that the cheliceral horns and the longer pedipalps of the male seem to play an important role, during both intersexual and intrasexual encountering.
  • Alvaro, J. J.; Ezzouhairi, H.; Vennin, E.; Ribeiro, M. L.; Clausen, S.; Charif, A.; Ayad, N. A. & Moreira, M. E.
    | The Early-Cambrian Boho volcano of the El Graara massif, Morocco: Petrology, geodynamic setting and coeval sedimentation
    | Journal of African Earth Sciences, 2006 , 44 , 396-410 , DOI 10.1016/j.jafrearsci.2005.12.008 | Geosciences, Multidisciplinary | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    A major volcanic episode is recorded across the Neoproterozoic-Cambrian transition in the Moroccan Anti-Atlas. Several volcanic cones are still preserved in the El Graara massif, laterally correlatable with volcanic flows dated as Early Cambrian (U/Pb date of 534 +/- 10 Ma). Volcanic ashes and flows are interbedded with the uppermost part of the Adoudou dolostones, whereas the best-preserved volcano (the Boho Jbel) is onlapped by the overlying Lie-de-vin strata. Available petro-geochemical data from the Boho volcano suggest an alkaline magmatism probably derived from low-grade melting of a garnet-lherzolite mantle source, followed by fractional crystallization. The silica-undersaturated basaltic liquid evolved to form oversaturated rocks: the fractionation of a ferromagnesian phase with high-Ca and low-Al contents is suggested as the main process to cut across the critical plane of silica undersaturation in this geochemical series. Although the Boho geochemical patterns are similar to those of some rift emplacements, more data from other coeval magmatic eruptions are necessary to constrain their geodynamic setting. Erosion of the Boho volcano favoured formation of a slope-apron composed of four sedimentary facies belts: chaotic megabreccia (related to downslope mass movements of rigid blocks), amalgamated breccia sheets (emplaced by viscous debris flows), a heterogeneous terrigenous belt (representing offshore substrates interrupted by channels intersected by cross-bedded shoals), and variegated shales and stromatolitic dolostones (typical of the Lie-de-vin Formation). Sharp changes in sedimentation rate were associated with modifications in paleorelief sloping and transport mechanisms from subaerial (?) rock fall at the foot of the cone escarpment to sheet-like debris flow on the slopes, and the replacement by sedimentation under wave and storm influence. The presence of an active carbonate productivity, recorded in the primary porosities of the Boho slope-apron, is suggested by widespread development of a robust, coelobiontic, microbial carbonate factory resilient to poisoning by terrigenous influx. Diagenesis in these deposits includes marine, meteoric and deep-burial cementation of calcite, dolomite, iron oxides, quartz, feldspar, and celestine, the latter indicating precipitation from hypersaline pore fluids. (c) 2006 Elsevier Ltd. All rights reserved.
  • Amniat-Talab, M.; Khoda-Bakhsh, R. & Guerin, S.
    | Quantum state engineering in a cavity by Stark chirped rapid adiabatic passage
    | Physics Letters A, 2006 , 359 , 366-372 , DOI 10.1016/j.physleta.2006.06.056 | Physics, Multidisciplinary | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We propose a robust scheme to generate single-photon Fock states and atom-photon and atom-atom entanglement in atom-cavity systems. We also present a scheme for quantum networking between two cavity nodes using an atomic channel. The mechanism is based on Stark-chirped rapid adiabatic passage (SCRAP) and half-SCRAP processes in a microwave cavity. The engineering of these states depends on the design of the adiabatic dynamics through the static and dynamic Stark shifts. (c) 2006 Elsevier B.V. All rights reserved.
  • Ania-Castanon, J. D.; Turitsyn, S. K.; Tonello, A.; Wabnitz, S. & Pincemin, E.
    | Multi-level optimization of a fiber transmission system via nonlinearity management
    | Optics Express, 2006 , 14 , 8065-8071 | Optics | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    Nonlinearity management is explored as a complete tool to obtain maximum transmission reach in a WDM fiber transmission system, making it possible to optimize multiple system parameters, including optimal dispersion pre-compensation, with fast simulations based on the continuous-wave approximation. (c) 2006 Optical Society of America.
  • Baraut, J.; Perrier, A.; Comte, V.; Richard, P.; Le Gendre, P. & Moise, C.
    | Reactions of dicarbanion equivalents generated from complexation of 1,3-dienes on Ti(II) moiety
    | Tetrahedron Letters, 2006 , 47 , 8319-8322 , DOI 10.1016/j.tetlet.2006.09.077 | Chemistry, Organic | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    Conjugated dienes are able to react as 1,2- or 1,4-dicarbanions by coordination on Ti(II) moiety. These two possibilities are exemplified in this letter with isoprene, myrcene and several aldehydes to give 1,4- and 1,6-diols. When allowed to react with esters at room temperature, the titanium-diene complexes lead to cyclopentenol derivatives. Surprisingly, when this reaction is performed at lower temperature (-40 degrees C), allylic ketones are formed with high regio and diastereoselectivities. (c) 2006 Elsevier Ltd. All rights reserved.
  • Binczak, S.; Jacquir, S.; Bilbault, J. M.; Kazantsev, V. B. & Nekorkin, V. I.
    | Experimental study of electrical FitzHugh-Nagumo neurons with modified excitability
    | Neural Networks, 2006 , 19 , 684-693 , DOI 10.1016/j.neunet.2005.07.011 | Computer Science, Artificial Intelligence | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    We present an electronical circuit modelling a FitzHugh-Nagumo neuron with a modified excitability. To characterize this basic cell, the bifurcation curves between stability with excitation threshold, bistability and oscillations are investigated. An electrical circuit is then proposed to realize a unidirectional coupling between two cells, mimicking an inter-neuron synaptic coupling. In such a master-slave configuration, we show experimentally how the coupling strength controls the dynamics of the slave neuron, leading to frequency locking, chaotic behavior and synchronization. These phenomena are then studied by phase map analysis. The architecture of a possible neural network is described introducing different kinds of coupling between neurons. (c) 2005 Elsevier Ltd. All rights reserved.
  • Bonnard, B.; Caillau, J. B. & Dujol, R.
    | Averaging and optimal control of elliptic Keplerian orbits with low propulsion
    | Systems & Control Letters, 2006 , 55 , 755-760 , DOI 10.1016/j.sysconle.2006.03.004 | Automation & Control Systems; Operations Research & Management Science | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    This article deals with the optimal transfer of a satellite between Keplerian orbits using low propulsion. It is based on preliminary results of Geffroy [Generalisation des techniques de moyennation en controle optimal, application aux problemes de rendez-vous orbitaux poussee faible. Ph.D. Thesis, Institut National Polytechnique de Toulouse, France, Octobre 1997] where the optimal trajectories are approximated using averaging, techniques. The objective is to introduce the appropriate geometric framework and to complete the analysis of the averaged optimal trajectories for energy minimization, showing in particular the connection with Riemannian problems having integrable geodesics. (C) 2006 Elsevier B.V. All rights reserved.
  • Brevet, D.; Lucas, D.; Mugnier, Y. & Harvey, P.
    | Electrochemical dissociative oxidation of the unsaturated Pd-3(dppm)(3)(CO)(2+) cluster; An astonishing resemblance with the photo-oxidative analogue
    | Journal of Cluster Science, 2006 , 17 , 5-12 , DOI 10.1007/s10876-005-0013-1 | Chemistry, Inorganic & Nuclear | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    Cyclic voltammetry (CV), rotating disk electrode voltammetry (RDE) and bulk electrolysis were used to investigate the electrochemical oxidation of the title cluster in acetonitrile (CH3CN). Two irreversible 2-electron oxidation processes occur at +0.95 V and +1.15 V vs. SCE. Bulk electrolysis demonstrates that the d(9)-d(9) Pd-2(dppm)(2)(NCCH3)(2)(2+) 4 complex is generated among the first intermediates, and the d(8) Pd(dppm)(NCCH3)(2)(2+) 3 is formed as the final product. The intermediacy of "Pd-3(dppm)(3)(CO)(4+)" and "Pd-3(dppm)(3) (CO)(4+)" is suspected but not confirmed. This oxidation process exhibits a close resemblance to the photo oxidative reactivity of the title cluster in the presence of chlorocarbons (R-Cl) for which the sole observed product is Pd(dppm)Cl-2.
  • Brugerolle, G. & Bordereau, C.
    | Immunological and ultrastructural characterization of spirotrichonymphid flagellates from Reticulitermes grassei and R. flavipes (syn. R. santonensis), with special reference to Spirotrichonympha, Spironympha and Microjoenia
    | Organisms Diversity & Evolution, 2006 , 6 , 109-123 , DOI 10.1016/j.ode.2005.07.004 | Evolutionary Biology | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5548 )
  • 2010.05.25
    Abstract:
    Five species of spirotrichonymphids representing three genera have been studied by light and immunofluorescence microscopy, and by transmission electron microscopy. The genus Spirotrichonympha, represented by S. flagellata from Reticulitermes grassei, is characterized by a compound axostyle composed of several fibers or subaxostyles. The genus Spironyinplia, represented by S. kofoidi from Reticulitermes flavipes (syn. R. santonensis) and by the two new species S. verticis and S. lanceata, is characterized by flagellar lines restricted to the anterior area and a simple, tubular axostyle. Spironympha verticis and S. lanceata are mainly distinguished by ultrastructural details of their flagellar lines and axostyle. These three Spironympha species were found in hosts identified as R. flavipes or R. santonensis, but not in R. grassei. This provides additional support for the synonymy of R. santonensis with R. flavipes recently demonstrated by molecular methods. The generic diagnosis of Microjoenia is emended, based on an ultrastructure study of M. fallax. (c) 2006 Gesellschaft fur Biologische Systematik. Published by Elsevier GmbH. All rights reserved.
  • Brunella, M.
    | Inexistence of invariant measures for generic rational differential equations in the complex domain
    | Boletin De La Sociedad Matematica Mexicana, 2006 , 12 , 43-49 | Mathematics | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    We prove that a generic holomorphic foliation by curves on the complex projective space has no invariant measures. The main ingredient is an index formula for invariant measures.
  • Crovisier, S. & Rams, M.
    | IFS attractors and Cantor sets
    | Topology and Its Applications, 2006 , 153 , 1849-1859 , DOI 10.1016/j.topol.2005.06.010 | Mathematics, Applied; Mathematics | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    We build a metric space which is homeomorphic to a Cantor set but cannot be realized as the attractor of an iterated function system. We give also an example of a Cantor set K in R-3 such that every homeomorphism f of R-3 which preserves K coincides with the identity on K. (C) 2005 Elsevier B.V. All rights reserved.
  • Denat, F.; Tripier, R.; Boschetti, F.; Espinosa, E. & Guilard, R.
    | Reaction of polyamines with diethyloxalate: a convenient route for the synthesis of tetraazacycloalkanes
    | Arkivoc, 2006 , 212-233 | Chemistry, Organic | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5633 )
  • 2010.05.25
    Abstract:
    The reactivity of various polyamines with diethyloxalate has been investigated. It appears that, in similar experimental conditions, primary diamines give predominantly [2+2] adducts while the use of secondary benzylated polyamines results in [1+1] condensation. Although the intermediate tetraamides formed in the first case are extremely poorly soluble and show very slow reactivity towards reducing agents, cyclam has been obtained by using ultrasounds during the reaction of the corresponding tetraoxomacrocycle with BH3/THF. The [1+1] cyclization reaction of diversely N-benzylated linear tetraamines, whose selective syntheses have been devised herein, gives access to various N-benzylated cyclens and cyclams. New macrocyclic ligands containing both amine and amide type nitrogen atoms have been formed as intermediates in these syntheses. Two compounds containing an aminal function exhibit an unexpected reactivity, leading to the formation of new bisaminal products whose structures have been established by X-ray diffraction.
  • Dinda, P. T.; Ngabireng, C. M.; Porsezian, K. & Kalithasan, B.
    | Modulational instability in optical fibers with arbitrary higher-order dispersion and delayed Raman response
    | Optics Communications, 2006 , 266 , 142-150 , DOI 10.1016/j.optcom.2006.04.017 | Optics | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We analyse modulational instability (MI) of electromagnetic waves in a large variety of optical fibers having different refractive-index profiles. For the normal-, anomalous-, and zero-dispersion regimes of the wave propagation, we show that whenever the second-order dispersion competes with higher-order dispersion (HOD), propagation of plane waves leads to a rich variety of dynamical behaviors. Most of the richness comes from the existence of critical behaviors, which include situations in which the HOD suppresses MI in the anomalous dispersion regime, and other situations in which the HOD acts in the opposite way by inducing non-conventional MI processes in the normal- and anomalous-dispersion regimes. We show that non-conventional MI sidebands are more prone to Raman-induced degradations than ordinary MI sidebands can be. (c) 2006 Elsevier B.V. All rights reserved.
  • Dommergues, J. L.; Dommergues, C. H. & Meister, C.
    | Exploration of the Oxynoticeratidae ornamental morphospace using the discrete cosine transform (DCT) to analyze rib patterns
    | Paleobiology, 2006 , 32 , 628-651 | Biodiversity Conservation; Ecology; Evolutionary Biology; Paleontology | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    The discrete cosine transform (DCT) is a Fourier-related transform widely used in signal processing and well suited to analyzing open outlines such as ammonite ribs. The method is applied here to depict and decipher the ribbing morphospace of a large group of Lower Jurassic ammonites composed of the Oxynoticeratidae and their close ancestors. Because they are clearly associated with buoyancy and/or swimming ability, the usually clearly involute, comparatively smooth and compressed shells of these ammonites may well be misleading taxonomic markers. In this context, quantitative analysis of the ribbing pattern using the DCT may significantly improve our perception of the ornamental patterns expressed within the group. A set of 251 specimens illustrating the worldwide fauna and selected from more than 80 publications is analyzed. Big differences are found in the evolutionary patterns of the two main lineages of Oxynoticeratidae currently accepted in the literature. A previously unsuspected Mediterranean group comprising principally the genus Parasteroceras is identified from its distinctive ornamentation. The northwest European and Mediterranean genera Eparietites, Oxynoticeras, and Parasteroceras do not feature among the American (East Pacific) faunas. This finding calls into question some generally accepted correlations between European and American stratigraphic frameworks. The study shows that the DCT is a valuable tool for discriminating between species within the huge and often puzzling range of ornamental variation of the main genera (e.g., Gleviceras and Radstockiceras).
  • Fraichard, S.; Bouge, A. L.; Chauvel, I. & Bouhin, H.
    | Tenectin, a novel extracellular matrix protein expressed during Drosophila melanogaster embryonic development
    | Gene Expression Patterns, 2006 , 6 , 772-776 , DOI 10.1016/j.modgep.2006.01.007 | Developmental Biology; Genetics & Heredity | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5548 )
  • 2010.05.25
    Abstract:
    During Drosophila embryonic development, various morphogenetic processes require the remodeling of the extracellular matrix. In a previous study, we have identified and characterized a cDNA encoding a novel putative extracellular matrix protein named tenebrin, in the beetle Tenebrio molitor. Here, we examine the expression of the Drosophila ortholog, referred to as Tenectin (Tnc), during embryonic development. Tnc is expressed in the majority of tissues of neuroectodermic origin such as hindgut, foregut, tracheal system, anal plate, and CNS. In the CNS, the Tnc transcript is restricted to a few cells, whereas the protein is located in the dorsal part of the axonal tracts. In the hindgut and the trachea, Tnc protein is expressed on the apical pole of the cells. Tnc is an extracellular matrix protein secreted in a polarized way in different organs of Drosophila embryos. (c) 2006 Elsevier B.V. All rights reserved.
  • Francoise, J. P. & Pelletier, M.
    | Iterated integrals, Gelfand-Leray residue, and first return mapping
    | Journal of Dynamical and Control Systems, 2006 , 12 , 357-369 , DOI 10.1007/s10450-006-0004-z | Automation & Control Systems; Mathematics, Applied | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    Recently, one of the authors gave an algorithm for calculating the first nonzero Poincare-Pontryagin function of a small polynomial perturbation of a polynomial Hamiltonian, under a generic hypothesis. We generalize this algorithm and show that any Poincare-Pontryagin function of order l, denoted by M-l, can be written as a sum of an iterated integral of length at most l and of a combination of all previous Poincare-Pontryagin functions, M-1, M-2,...,Ml-1, and their derivatives. This extends some results obtained recently and allows to identify the Bautin ideal with the ideal generated by iterated integrals.
  • Goux, J.; Le Gendre, P.; Richard, P. & Moise, C.
    | Bimetallic complexes with ruthenium and tantalocene moieties: Synthesis and use in a catalytic cyclopropanation reaction
    | Journal of Organometallic Chemistry, 2006 , 691 , 3239-3244 , DOI 10.1016/j.jorganchem.2006.03.029 | Chemistry, Inorganic & Nuclear; Chemistry, Organic | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    The reaction of the tantalocene dichloride monophosphines (1-2) with the binuclear complex [(p-cymene)RuCl2](2) gives the heterobimetallic compounds (p-cymene)[(eta(5)-C5H5)(mu-eta(5):eta(1)-C5H4(CH2)(2)PR2)TaCl2]RuCl2 (3-4). The air oxidation of these bimetallic species 3-4, leads to the cationic hydroxo tantalum ruthenium derivatives 5-6. The last ones are easily deprotonated by a base to afford the oxo analogues 7-8. A preliminary assessment in catalytic cyclopropanation of styrene with tantalum ruthenium bimetallic complexes 3-8 as precatalysts revealed a cooperative effect with a subtle role of the early metal fragment. (c) 2006 Elsevier B.V. All rights reserved.
  • Journaux, L.; Foucherot, I. & Gouton, P.
    | Reduction of the number of spectral bands in Landsat images: a comparison of linear and nonlinear methods
    | Optical Engineering, 2006 , 45 , 067002 , DOI 10.1117/1.2212108 | Optics | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    We describe some applications of linear and nonlinear projection methods in order to reduce the number of spectral bands in Landsat multispectral images. The nonlinear method is curvilinear component analysis (CCA), and we propose an adapted optimization of it for image processing, based on the use of principal-component analysis (PCA, a linear method). The principle of CCA consists in reproducing the topology of the original space projection points in a reduced subspace, keeping the maximum of information. Our conclusions are: CCA is an improvement for dimension reduction of multispectral images; CCA is really a nonlinear extension of PCA; CCA optimization through PCA (called CCAinitPCA) allows a reduction of the computation burden but provides a result identical to that of CCA. (c) 2006 Society of Photo-Optical Instrumentation Engineers.
  • Labruyere, A. & Dinda, P. T.
    | Analytical design of nonlinear optical loop mirrors for fiber-optic communication systems
    | Optics Communications, 2006 , 266 , 676-680 , DOI 10.1016/j.optcom.2006.05.021 | Optics | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We propose an easy and efficient method for analytically designing nonlinear optical loop mirrors (NOLMs) for fiber-optic communication systems. This analytical design is based on a Taylor series expansion of the transfer function of the NOLM, from which highly stable dynamical regimes can be readily obtained for any desired pulse parameters. We present numerical simulations showing dramatically improved performances in a 160 Gb/s transmission system that incorporates the NOLMs designed analytically. (c) 2006 Elsevier B.V. All rights reserved.
  • Lalitte, P. & Bigand, E.
    | Music in the moment? Revisiting the effect of large scale structures
    | Perceptual and Motor Skills, 2006 , 103 , 811-828 , DOI 10.2466/PMS.103.3.811-828 | Psychology, Experimental | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    The psychological relevance of large-scale musical structures has been a matter of debate in the music community. This issue was investigated with a method that allows assessing listeners' detection of musical incoherencies in normal and scrambled versions of popular and contemporary music pieces. Musical excerpts were segmented into 28 or 29 chunks. In the scrambled version, the temporal order of these chunks was altered with the constraint that the transitions between two chunks never created local acoustical and musical disruptions. Participants were required (1) to detect on-line incoherent linking of chunks, (2) to rate aesthetic quality of pieces, and (3) to evaluate their overall coherence. The findings indicate a moderate sensitivity to large-scale musical structures for popular and contemporary music in both musically trained and untrained listeners. These data are discussed in light of current models of music cognition.
  • Lee, S. B.; Lefebvre, B. & Choi, D. K.
    | Tremadocian stylophoran echinoderms from the Taebaeksan Basin, Korea
    | Journal of Paleontology, 2006 , 80 , 1072-1086 | Paleontology | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Abundant isolated elements of cornute and mitrate stylophorans were recovered from the upper Tremadocian Tumugol Formation in the Taebaeksan Basin, Korea. Cornute skeletal elements comprise a diverse assemblage of marginals and brachials of cothurnocystid affinities, suggesting the presence of no fewer than four different species. Mitrate remains include numerous isolated adorals, marginals, and aulacophoral plates with typical peltocystidan morphologies. Two adorals are identified as Anatifopsis sp., while all the others are attributable to A. cocaban. However, the two previously documented peltocystidans of Korea, A. cocaban and A. truncata, are sufficiently distinct from other Anatifopsis species to warrant assignment to a new genus, Taebaekocystis. Cladistic analyses suggest that Lagynocystida is the sister group of the clade uniting peltocystidans and mitrocystitidans and that the adorals of Taebaekocystis n. gen. and associated isolated peltocystidan elements possibly account for several different types of peltocystidans, intermediate in morphology between Peltocystidae and Kirkocystidae.
  • Mansour, M. M.; Garcia, A. L. & Baras, F.
    | Hydrodynamic description of the adiabatic piston
    | Physical Review E, 2006 , 73 , 016121 , DOI 10.1103/PhysRevE.73.016121 | Physics, Fluids & Plasmas; Physics, Mathematical | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    A closed macroscopic equation for the motion of the two-dimensional adiabatic piston is derived from standard hydrodynamics. It predicts a damped oscillatory motion of the piston towards a final rest position, which depends on the initial state. In the limit of large piston mass, the solution of this equation is in quantitative agreement with the results obtained from both hard disk molecular dynamics and hydrodynamics. The explicit forms of the basic characteristics of the piston's dynamics, such as the period of oscillations and the relaxation time, are derived. The limitations of the theory's validity, in terms of the main system parameters, are established.
  • Meddour, A.; Uziel, J.; Courtieu, J. & Juge, S.
    | Enantiodifferentiation of acyclic phosphonium salts in chiral liquid crystalline solutions
    | Tetrahedron-asymmetry, 2006 , 17 , 1424-1429 , DOI 10.1016/j.tetasy.2006.04.020 | Chemistry, Inorganic & Nuclear; Chemistry, Organic; Chemistry, Physical | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    The enantiodifferentiation of acyclic phosphonium salts bearing a stereogenic centre, whether on the phosphorus atom or on one of its substituents, was investigated by H-2-{H-1}, C-13-{H-1} and P-31-{H-1} NMR in chiral liquid crystals composed of a polypeptide dissolved in an organic solvent. For the first time, the enantiomers of P-chirogenic phosphorus compounds were discriminated in these anisotropic media, affording good to excellent separation of the signals, allowing the determination of their proportion. While P-31-{H-1} NMR spectra showed no chiral separation, H-2-{H-1} NMR was efficient in the enantiodifferentiation of an isotopically labelled compound. Better Still, C-31-{H-1} NMR in chiral liquid crystal appears as a powerful method for the enantiodifferentiation of this class of compounds, since separations of the signal up to 0.8 ppm were observed. In this commercially available anisotropic medium, H-2 and C-13 NMR offers a new promising alternative method for the enantiodifferentiation of chiral phosphonium salts. (c) 2006 Elsevier Ltd. All rights reserved.
  • Meuret, D. & Morlaix, S.
    | In what ways does social origin influence scholastic performance
    | Revue Francaise De Sociologie, 2006 , 47 , 49-+ | Sociology | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : UMR5192 )
  • 2010.05.25
    Abstract:
    Using PISA 2000 data, this study presents an international comparison of the way social origin influences reading comprehension performances, looking at a variety of variables, some external to the school system, others internal. A variable's effect is strong in proportion to the strength of its association to father's occupation and degree to which it favors performance. The study uses the method of path analysis to distinguish between these two aspects. The French situation is presented, then compared to twelve other European Union countries. In all countries, social origin influences performance much more strongly through external variables than variables internal to the educational system : the data used demonstrate that quality of teaching varies little by pupils' social origin. The article draws theoretical conclusions from the comparison concerning resistance of traditional forms of social advantage, as well as practical consequences regarding choice of variables to act on in order to diminish the effect of social origin on scholastic performance.
  • Michelot, F.
    | Algebraic treatment of some systems with spin-like interactions with applications in quantum optics and vibronic spectroscopy
    | Journal of Physics A-mathematical and General, 2006 , 39 , 5933-5956 , DOI 10.1088/0305-4470/39/20/020 | Physics, Multidisciplinary; Physics, Mathematical | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    A unified scheme based on algebraic techniques is proposed to solve the eigenvalue equation for a class of systems involving spin-like interactions. From general assumptions Hamiltonian models are built from selected elements in the enveloping algebra of the harmonic oscillator, su(2) and su(1, 1) algebras. Our method is next illustrated through examples taken in the areas of quantum optics and dynamical Jahn-Teller systems in orbital doublets.
  • Picard, D. & Vinter, A.
    | Decomposing and connecting object representations in 5-to 9-year-old children's drawing behaviour
    | British Journal of Developmental Psychology, 2006 , 24 , 529-545 , DOI 10.1348/026151005X49836 | Psychology, Developmental | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    This study aimed at specifying the content of the representational redescription (RR) process assumed by Karmiloff-Smith (1992) with respect to the emergence of inter-representational flexibility in children's drawing behaviour. We hypothesized that the RR process included part-whole decomposition processes that are essential to the ability to produce cross-categorical drawings. We presented 5- to 9-year-old children with either a two-part JP) or a several-part (SP) decomposition task involving a house and a man (experimental conditions) or with no such decomposition task (control condition), prior to a connection task (drawing a man-house). The results showed that connection performances were better in children who had previously decomposed the objects into two parts than in children assigned to the control group. This positive 'priming' effect was attributed to the activation of part-whole analysis processes that further facilitated the management of complex connections between the objects.
  • Pincemin, E.; Tan, A.; Bezard, A.; Tonello, A.; Wabnitz, S.; Ania-Castanon, J. D. & Turitsyn, S.
    | Robustness of 40 Gb/s ASK modulation formats in the practical system infrastructure
    | Optics Express, 2006 , 14 , 12049-12062 | Optics | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    In this work, we analyzed by means of numerical and laboratory experiments the resilience of 40 Gb/s amplitude shift keying modulation formats to transmission impairments in standard single-mode fiber lines as well as to optical filtering introduced by the optical add/drop multiplexer cascade. Our study is a pre-requisite to assess the implementation of cost-effective 40 Gb/s modulation technology in next generation high bit-rate robust optical transport networks. (c) 2006 Optical Society of America.
  • Rey, A. & Schiller, N. O.
    | A case of normal word reading but impaired letter naming
    | Journal of Neurolinguistics, 2006 , 19 , 87-95 , DOI 10.1016/j.jneuroling.2005.09.003 | Linguistics; Neurosciences; Psychology, Experimental | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    A case of a word/letter dissociation is described. The present patient has a quasi-normal word reading performance (both at the level of speed and accuracy) while he has major problems in nonword and letter reading. More specifically, he has strong difficulties in retrieving letter names but preserved abilities in letter identification. This study complements previous cases reporting a similar word/letter dissociation by focusing more specifically on word reading and letter naming latencies. The results provide new constraints for modeling the role of letter knowledge within reading processes and during reading acquisition or rehabilitation. (c) 2005 Elsevier Ltd. All rights reserved.
  • Shao, J. H.
    | Hamilton-Jacobi semi-groups in infinite dimensional spaces
    | Bulletin Des Sciences Mathematiques, 2006 , 130 , 720-738 , DOI 10.1016/j.bulsci.2006.03.001 | Mathematics, Applied | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    Let (X, rho) be a Polish space endowed with a probability measure mu. Assume that we can do Malliavin Calculus on (X, mu). Let d: X x X -> [0, +infinity] be a pseudo-distance. Consider Q(t)F(x) = inf(y epsilon X){F(y) + d(2)(x, y)/2t}. We shall prove that Q(t)F satisfies the Hamilton-Jacobi inequality under suitable conditions. This result will be applied to establish transportation cost inequalities on path groups and loop groups in the spirit of Bobkov, Gentil and Ledoux. (c) 2006 Elsevier Masson SAS. All rights reserved.
  • Szubert, A.; Sadowski, Z.; Gros, C. P.; Barbe, J. M. & Guilard, R.
    | Identification of metalloporphyrins extracted from the copper bearing black shale of Fore Sudetic Monocline (Poland)
    | Minerals Engineering, 2006 , 19 , 1212-1215 , DOI 10.1016/j.mineng.2005.11.007 | Engineering, Chemical; Mineralogy; Mining & Mineral Processing | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5633 )
  • 2010.05.25
    Abstract:
    Metalloporphyrins were isolated from copper-bearing black shale ores. The shale originates from the Lubin copper mine (Poland). The porphyrins have been extracted by way of a Soxhlet apparatus, and then purified using column chromatography. In order to identify the extracted porphyrins complexes UV-Vis, mass spectrometry and EPR analytical techniques have been used. (c) 2005 Published by Elsevier Ltd.
  • Taguchi, M.; Kruger, P.; Parlebas, J. C. & Kotani, A.
    | Theoretical study of resonant x-ray emission spectroscopy of Mn films on Ag
    | Physical Review B, 2006 , 73 , 125404 , DOI 10.1103/PhysRevB.73.125404 | Physics, Condensed Matter | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    We report a theoretical study on resonant x-ray emission spectra (RXES) in the whole energy region of the Mn L-2,L-3 white lines for three prototypical Mn/Ag(001) systems: (i) a Mn impurity in Ag, (ii) an adsorbed Mn monolayer on Ag, and (iii) a thick Mn film. The calculated RXES spectra depend strongly on the excitation energy. At L-3 excitation, the spectra of all three systems are dominated by the elastic peak. For excitation energies around L-2, and between L-3 and L-2, however, most of the spectral weight comes from inelastic x-ray scattering. The line shape of these inelastic "satellite" structures changes considerably between the three considered Mn/Ag systems, a fact that may be attributed to changes in the bonding nature of the Mn d orbitals. The system dependence of the RXES spectrum is thus found to be much stronger than that of the corresponding absorption spectrum. Our results suggest that RXES in the Mn L-2,L-3 region may be used as a sensitive probe of the local environment of Mn atoms.
  • Uribe, M.
    | Principal Poincare-Pontryagin function of polynomial perturbations of the Hamiltonian triangle
    | Journal of Dynamical and Control Systems, 2006 , 12 , 109-134 , DOI 10.1007/s10450-006-9687-4 | Automation & Control Systems; Mathematics, Applied | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    In this paper, we consider a small polynomial perturbation of the Hamiltonian vector field with the Hamiltonian F(x, y) = x[y(2) - (x - 3)(2)] having a center bounded by a triangle. The main result of this work is that the principal Poincare-Pontryagin function associated with such a perturbation and with the family of ovals surrounding the center belongs to the C[t, 1/t] module generated by Abelian integrals I-0(t) and I-2(t) and by I*(t), where I*(t) is not ail Abelian integral. We show that, in general, the principal Poincare-Pontryagin function of order two of a polynomial perturbation of the degree at least five is not an Abelian integral.
  • Yetongnon, K.; Suwanmanee, S.; Benslimane, D. & Champin, P. A.
    | A web-centric semantic mediation approach for spatial information systems
    | Journal of Visual Languages and Computing, 2006 , 17 , 1-24 , DOI 10.1016/j.jvlc.2005.04.002 | Computer Science, Software Engineering | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    Semantics-related issues are at the heart of web-centric information systems and emerging spatial applications that require an integrated access to collections of heterogeneous data sources. We present an ontology-based semantic mediation approach and its application to spatial system interoperability. The approach is based oil three contexts described by ontologies used to capture the semantics of data sources and to resolve their semantic discrepancies. The global ontology context defines generic application domain mediation concepts while the ontology local contexts are devoted to the description of local concepts. The cooperation contexts provide semantic concepts that encapsulate three key components: (1) semantic roles defined by ontological agreements oil the global ontology, (2) virtual views defined oil the local ontologies, and (3) context transformation mappings used to define interontology relationships. We illustrate the proposed mediation approach on spatial information systems, relying on the description and reasoning capabilities of OWL to establish relations between concepts of the different ontologies. (c) 2005 Elsevier Ltd. All rights reserved.
  • Abdenur, F.; Bonatti, C. & Crovisier, S.
    | Global dominated splittings and the C-1 Newhouse phenomenon
    | Proceedings of the American Mathematical Society, 2006 , 134 , 2229-2237 | Mathematics, Applied; Mathematics | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    We prove that given a compact n-dimensional boundaryless manifold M, n >= 2, there exists a residual subset R of the space of C-1 diffeomorphisms Diff(1) (M) such that given any chain-transitive set K of f is an element of R, then either K admits a dominated splitting or else K is contained in the closure of an infinite number of periodic sinks/sources. This result generalizes the generic dichotomy for homoclinic classes given by Bonatti, Diaz, and Pujals (2003). It follows from the above result that given a C-1-generic diffeomorphism f, then either the nonwandering set Omega(f) may be decomposed into a finite number of pairwise disjoint compact sets each of which admits a dominated splitting, or else f exhibits infinitely many periodic sinks/sources (the "C-1 Newhouse phenomenon"). This result answers a question of Bonatti, Diaz, and Pujals and generalizes the generic dichotomy for surface diffeomorphisms given by Mane (1982).
  • Amory-Mazaudier, C.; Le Huy, M.; Cohen, Y.; Doumbia, V.; Bourdillon, A.; Fleury, R.; Fontaine, B.; Duyen, C. H.; Kobea, A.; Laroche, P.; Lassudrie-Duchesne, P.; Le Viet, H.; Le Truong, T.; Viet, H. L.; Menvielle, M.; Chien, T. N.; Xuan, A. N.; Ouattara, F.; Petitdidier, M.; Thu, H. P. T.; Xuan, T. P.; Philippon, N.; Thi, L. T.; Thien, H. V. & Vila, P.
    | Sun-Earth System Interaction studies over Vietnam: an international cooperative project
    | Annales Geophysicae, 2006 , 24 , 3313-3327 | Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : FRE2740 )
  • 2010.05.25
    Abstract:
    During many past decades, scientists from various countries have studied separately the atmospheric motions in the lower atmosphere, in the Earth's magnetic field, in the magnetospheric currents, etc. All of these separate studies lead today to the global study of the Sun and Earth connections, and as a consequence, new scientific programs (IHY-International Heliophysical Year, CAWSES-Climate and Weather in the Sun-Earth System) are defined, in order to assume this new challenge. In the past, many scientists did not have the possibility to collect data at the same time in the various latitude and longitude sectors. Now, with the progress of geophysical sciences in many developing countries, it is possible to have access to worldwide data sets. This paper presents the particularities of geophysical parameters measured by the Vietnamese instrument networks. It introduces a cooperative Vietnamese-IGRGEA (International Geophysical Research Group Europe Africa) project, and presents, for the first time, to the international community, the geophysical context of Vietnam. Concerning the ionosphere: since 1963, during four solar cycles, the ionosonde at Phu Thuy (North Vietnam) was operating. The Phu Thuy data exhibits the common features for the ionospheric parameters, previously observed in other longitude and latitude sectors. The critical frequencies of the E, F1 and F2 ionospheric layers follow the variation of the sunspot cycle, F2 and E critical frequencies also exhibit an annual variation. The first maps of TEC made with data from GPS receivers recently installed in Vietnam illustrate the regional equatorial pattern, i.e. two maxima of electronic density at 15 degrees N and 15 degrees S from the magnetic equator and a trough of density at the magnetic equator. These features illustrate the equatorial fountain effect. Concerning the Earth's magnetic field: a strong amplitude of the equatorial electrojet was first observed by the CHAMP satellite at the height of 400 km in the Vietnamese longitude sector. In this paper we compare the ground magnetic observations of the Indian and Vietnamese magnetometer networks. This comparison highlights the regional structure of the amplitude of the equatorial electrojet, which is stronger in Vietnam than in India. Concerning the monsoon: Vietnam exhibits a strong monsoon and has mainly one rainy season peaking in August, hence associated with the southwest monsoon flow. But some monsoon variability from one place to another is related to the orography. In the mountainous northern regions of Vietnam, there is an "early" monsoon peaking in July. In the coastal regions between 12 degrees N and 19 degrees N the monsoon season is centered on October. Concerning lightning: Vietnam is a country of strong atmospheric storms with some areas of very intense lightning in North Vietnam (22,5 degrees N, 105 degrees E) and in South Vietnam (11 degrees N, 107 degrees E). In North Vietnam strong lightning is associated with the most intense rainy region.
  • Bakass, M.; Bellat, J. P.; Mokhlisse, A. & Bertrand, G.
    | The adsorption of water vapor an super absorbent product at low temperatures and low mass
    | Journal of Applied Polymer Science, 2006 , 100 , 1450-1456 , DOI 10.1002/app.23568 | Polymer Science | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    The adsorption isotherms of water vapor on super absorbent product have the same form of type III isotherm at ambient temperature with the hysteresis phenomena. For temperatures lower than ambient, the isotherms become deformed because of the chains effect. The polymer is characterized by a multilayer adsorption, which occurs before a full-course is complete. During adsorption reactions, the polymer undergoes rearrangement polymeric network, which results from a cooperative diffusion of the water molecules and from a chain spacing followed by an expansion of the polymeric network. Three types of water molecules adsorbed on polymer were identified: strongly dependent water, adsorbed water, and the water only trapped between the macromolecular chains.
  • Ballivet-Tkatchenko, D.; Ligabue, R. A. & Plasseraud, L.
    | Synthesis of dimethyl carbonate in supercritical carbon dioxide
    | Brazilian Journal of Chemical Engineering, 2006 , 23 , 111-116 | Engineering, Chemical | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    The reactivity of carbon dioxide with methanol to form dimethyl carbonate was Studied in the presence of the n-butylmethoxytin compounds n-Bu3SnOCH3, n-Bu2Sn(OCH3)(2), and [n-Bu-2(CH3O)Sn](2)O. The reaction occurred under solventless conditions at 423 K and was produced by an increase in CO, pressure. This beneficial effect is primarily attributed to phase behavior. The mass transfer under liquid-vapor biphasic conditions was not limiting when the system reached the supercritical state for a CO, pressure higher than 16 MPa. Under these conditions, CO2 acted as a reactant and a solvent.
  • Ballivet-Tkatchenko, D.; Cattey, H.; Plasseraud, L. & Richard, P.
    | catena-Poly[[di-n-butyltin(IV)]-mu-trifluoromethanesulfonato-[[di-n-buty l(trifluoromethanesulfonato)tin(IV)]-di-mu-hydroxo]]
    | Acta Crystallographica Section E-structure Reports Online, 2006 , 62 , M2820-M2822 , DOI 10.1107/S160053680603964X | Crystallography | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    The solid-state structure of the title compound, [Sn-2(CF3O3S)(2)(C4H9)(4)(OH)(2)](n), consists of an infinite chain of dimeric hydroxo di-n-butyltin(IV) complexes bridged by trifluoromethanesulfonate ligands. The X-ray crystallographic analysis reveals the presence of seven- and six-coordinate tin( IV) units. The structure contains two types of trifluoromethanesulfonate ligands, viz. bridging and terminal. The uncoordinated O atoms of terminal O3SCF3 are involved in both intra- and intermolecular hydrogen bonding with the bridging hydroxo ligands. The resulting two-dimensional network can be seen as a superimposed three-layer structure along the a axis.
  • Bertolim, M. A.; de Rezende, K. A.; Neto, O. M. & Vago, G. M.
    | Isolating blocks for Morse flows
    | Geometriae Dedicata, 2006 , 121 , 19-41 , DOI 10.1007/s10711-006-9083-y | Mathematics | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    We present a constructive general procedure to build Morse flows on n-dimensional isolating blocks respecting given dynamical and homological boundary data recorded in abstract Lyapunov semi-graphs. Moreover, we prove a decomposition theorem for handles which, together with a special class of gluings, insures that this construction not only preserves the given ranks of the homology Conley indices, but it is also optimal in the sense that no other Morse flow can preserve this index with fewer singularities.
  • Bigand, E.; Tillmann, B. & Poulin-Charronnat, B.
    | A module for syntactic processing in music?
    | Trends In Cognitive Sciences, 2006 , 10 , 195-196 , DOI 10.1016/j.tics.2006.03.008 | Behavioral Sciences; Neurosciences; Psychology, Experimental | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
  • Brunella, M.
    | A positivity property for foliations on compact Kahler manifolds
    | International Journal of Mathematics, 2006 , 17 , 35-43 | Mathematics | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    We prove that the canonical bundle of a foliation by curves on a compact Kahler manifold is pseudoeffective, unless the foliation is a (special) foliation by rational curves.
  • Cosp, J. & Binczak, S.
    | Programmable VLSI cubic-like function implementation
    | Electronics Letters, 2006 , 42 , 1221-1223 , DOI 10.1049/el:20062110 | Engineering, Electrical & Electronic | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    An analogue VLSI implementation of a cubic-like function is presented. whose design is focused to reduce the circuit complexity. Simulations show that the V-1 characteristic of the circuit resembles a cubic function, which can be easily adjusted by changing the bias parameters.
  • Doukkali, A.; Saoiabi, A.; Ferhat, M.; Mugnier, Y.; Vallat, A. & Guilard, R.
    | Thermodynamic and kinetic control over the oxidation mechanism of the natural vanadyl porphyrin series (DPEP)VO in methylene chloride: electrogeneration of an unusual dicationic species [(DPEP)VO](2)(2+)
    | New Journal of Chemistry, 2006 , 30 , 997-1003 , DOI 10.1039/b512360g | Chemistry, Multidisciplinary | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 ; UMR5633 )
  • 2010.05.25
    Abstract:
    The electrochemical behavior of the natural (DPEP)VO series (where DPEP is the dianion deoxophylloerythroetioporphyrinate) is studied in methylene chloride. The investigated compounds, which were extracted from oil shales of Tarfaya (Morocco), exhibit a typical electrochemical behavior as compared to that of related synthetic vanadyl porphyrins. The electro-oxidation of (DPEP)VO is characterized by a splitting of the peaks when carried out at a glassy carbon electrode. This can be explained by two possible paths (CE and EC mechanisms) which are characterized by a "square diagram" where the chemical step, C, corresponds to a dimerization (radical-radical or substrate-substrate reaction). The electrochemical or chemical (AgBF4) oxidation gives a dimeric dicationic species [(DPEP)VO] (2+)(2) which was characterised by EPR and UV-visible spectroscopy. Modelling of the current-voltage curves was carried out and all thermodynamic and kinetics parameters relative to the proposed square diagram were determined.
  • Duru-Bellat, M. & Kieffer, A.
    | The two facets - objective/subjective of social mobility
    | Sociologie Du Travail, 2006 , 48 , 455-473 , DOI 10.1016/j.soctura.2006.08.001 | Sociology | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : UMR5192 )
  • 2010.05.25
    Abstract:
    How does objective social mobility, traditionally measured with tables of mobility drawn up by sociologists, relate to feelings about mobility, i.e., how individuals perceive, explain and appraise their social trajectory? Using a question from a survey (Insee's Formation, qualification professionnelle), subjective mobility was statistically evaluated so as to bring the two approaches to mobility together and measure the (considerable) frequency of deviations. Subjective mobility was then analyzed qualitatively on the basis. of interviews conduced with respondents' in the same survey. This helps us account for deviations and identify the bundle of parameters that people use to assess their own mobility. Certain limits, both methodological and conceptual, ate pointed out that classical statistical surveys encounter in dealing with mobility. (c) 2006 Public par Elsevier Masson SAS.
  • El Hilali, A.; Boudon, V. & Loete, M.
    | Spectroscopy of XY(3)Z (C-3 nu) radicals with an odd number of electrons: A tensorial formalism adapted to the SU(2)circle times C-I superset of C-infinity nu(s) superset of C-3 nu(s) group chain
    | Journal of Molecular Spectroscopy, 2006 , 239 , 41-50 , DOI 10.1016/j.jms.2006.05.016 | Physics, Atomic, Molecular & Chemical; Spectroscopy | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    A tensorial formalism adapted to the case of XY(3)Z symmetric tops with half integer angular momenta is proposed as an extension of the formalism for the group chain O(3) C-infinity v superset of C-3v developed in a recent paper [A. El Hilali, V. Boudon, M. Loete, J. Mol. Spectrosc. 234 (2005) 113-121]. We use the chain SU(2) circle times C-I superset of D C-infinity v(S) superset of C-3v(S), where G(S) (G being C-infinity v or C-3v) is the G point group with its spinorial representations. Coupling coefficients and formulas for the computation of matrix elements of the tensor operators are derived for this chain. A deduction of coupling coefficients (Clebsch-Gordan, 6C, 9C, ...) and similar formulas is proposed for the group C-3v(S) itself. (c) 2006 Elsevier Inc. All rights reserved.
  • Eraud, C.; Lallemand, J. & Lormee, H.
    | Sex-ratio of Skylark Alauda arvensis broods in relation to timing of breeding
    | Bird Study, 2006 , 53 , 319-322 | Ornithology | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Capsule Earlier broods tend to be more male biased than later broods.
  • Francois, E. & David, B.
    | Morphological variations of Toxaster (Echinoida : Spatangoida) in regard of spatial (Castellane Arc SE France) and temporal (Valanginian-Hauterivian) variations of sedimentary environments: expression of a restricted adaptive potential
    | Geobios, 2006 , 39 , 355-371 , DOI 10.1016/j.geobios.2005.01.002 | Paleontology | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    The impact of sedimentary conditions on the settlement, growth, and morphology of primitive spatangoid sea urchins of the genus Toxaster from the Lower Cretaceous (Valanginian and Hauterivian of the Provencal platform) is analyzed. The analyses concern spatial and temporal patterns of variation. The spatial approach is based on six isochronous populations of Toxaster granosus kiliani (424 specimens in total) dated from the Verrucosum biozone, and distributed along a proximo-distal gradient. The temporal approach concerns a reference section (Carajuan) ranging from the Lower Valanginian to the Upper Hauterivian, and involving the species T granosus kiliani and T gibbus. Sedimentary environments have been characterized by a factorial analysis of five characteristics of facies. Sea urchin morphology has been described with seven measures allowing the computation of two angles (alpha and beta), and of six shape indices analyzed through a principal components analyses. The spatial approach shows that the adult mean size (> 20 mm) increases distally, and that morphology changes significantly across localities. However, only variations in alpha and beta are sequentially organized along the proximo-distal gradient (they correspond to a forward migration of the peristome and to an expansion of the plastronal area). The stratigraphic survey of facies variation along the 369 beds analyzed in Carajuan shows a clear change in sedimentary conditions: from unstable with bioclastic events (Valanginian), to homogeneous with a low content in bioclasts (Hauterivian). Most Toxaster specimens are concentrated in three stratigraphic units (Campylotoxus and Verrucosum biozones for T granosus kiliani; Sayni biozone for T gibbus), their abundance being related to the macrofaunal presence and diversity and to burrowing activity., The adult mean size is only significantly related to facies variation, for the T granosus kiliani from the Verrucosum biozone, increasing with textural gradient and bioclastic content. Shape - facies relationships have been identified for T granosus kiliani in both Campylotoxus and Verrucosum intervals. However, the morphological variables and facies characteristics involved differ between the two biozones. The synthesis of all significant relationships between size or shape and facies characteristics demonstrates that the response of Toxaster to environmental changes was limited, and varied in space as well as for the different periods of time considered. The only recurring impact of sedimentary changes involved sea urchin abundance, that is, their ability to settle. The low adaptive potential of Toxaster is discussed in the context of the early radiation of the Spatangoida. (c) 2006 Elsevier SAS. Tous droits reserves.
  • Gambaudo, J. M.; Guiraud, P. & Petite, S.
    | Minimal configurations for the Frenkel-Kontorova model on a quasicrystal
    | Communications In Mathematical Physics, 2006 , 265 , 165-188 , DOI 10.1007/s00220-006-1531-x | Physics, Mathematical | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    In this paper, we consider the Frenkel-Kontorova model of a one dimensional chain of atoms submitted to a potential. This potential splits into an interaction potential and a potential induced by an underlying substrate which is a quasicrystal. Under standard hypotheses, we show that every minimal configuration has a rotation number, that the rotation number varies continuously with the minimal configuration, and that every non negative real number is the rotation number of a minimal configuration. This generalizes well known results obtained by S. Aubry and P.Y. le Daeron in the case of a crystalline substrate.
  • Lambiotte, R.; Brenig, L. & Salazar, J. M.
    | On high-energy tails in inelastic gases
    | Physica A-statistical Mechanics and Its Applications, 2006 , 366 , 250-254 , DOI 10.1016/j.physa.2005.10.037 | Physics, Multidisciplinary | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    We study the formation of high-energy tails in a one-dimensional kinetic model for granular gases, the so-called Inelastic Maxwell Model. We introduce a time-discretized version of the stochastic process, and show that continuous time implies larger fluctuations of the particles energies. This is due to a statistical relation between the number of inelastic collisions undergone by a particle and its average energy. This feature is responsible for the high-energy tails in the model, as shown by computer simulations and by analytical calculations on a linear Lorentz model. (c) 2005 Elsevier B.V. All rights reserved.
  • Lathuiliere, A.; Mansouri, A.; Voisin, Y.; Marzani, F. S. & Gouton, P.
    | Stereoscopic system for 3D reconstruction using multispectral camera and LCD projector
    | Imaging Science Journal, 2006 , 54 , 19-28 , DOI 10.1179/174313106X93796 | Imaging Science & Photographic Technology | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    The paper describes a stereoscopic system based on a multispectral camera and an LCD projector. The concept demonstrated consists in adding spectral information to three-dimensional (3D) scene reconstruction. These data are provided by a multispectral camera equipped with interference filters. Before use, this system must be calibrated. This starts with a geometric calibration of the stereoscopic set using a weak calibration. Next, in order to recover the surface spectral reflectance curve of the scene, one must know the spectral response of the elements in the acquisition chain from the LCD projector to the camera. Then image acquisition can begin. In order to acquire a multispectral image, the LCD projector is used to project a luminous pattern onto the scene. The projected pattern is detected in the image and labelled. The 3D position of the different parts of the luminous pattern on the scene can be obtained using triangulation. Furthermore, a spectral reflectance curve is assigned to each part, allowing easy predictions of the scene under different illuminants. Thus, the use of a multispectral camera is justified by the fact that such a system presents an advantage over the classical RGB camera by providing more complete information.
  • Lefebvre, E.; Conan, F.; Cosquer, N.; Kerbaol, J. M.; Marchivie, M.; Sala-Pala, J.; Kubicki, M. M.; Vigier, E. & Garcia, C. J. G.
    | Syntheses, structural characterisation and magnetic properties of Fe(II) and Mn(II) compounds with the pentacyanopropenido ligand; structural characterisation of a substituted pyrazolo[1,5-a]pyrimidine
    | New Journal of Chemistry, 2006 , 30 , 1197-1206 , DOI 10.1039/b605030a | Chemistry, Multidisciplinary | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5188 )
  • 2010.05.25
    Abstract:
    Reactions between the metal(II) salts [M(CH3CN)(n])(BF4)(2) (M = Fe, n = 6; M = Mn, n = 4) and some organic anionic polynitriles were studied. With the pentacyanopropenide anion pcp(-)[pcp(-) = (NC)(2)CC(CN)C(CN)(2)(-)], were obtained, according to the experimental conditions, the new complexes [M(pcp)(2)(H2O)(4)] (1, M = Fe; 2, M = Mn) and [M(pcp)(2)] (3, M = Fe; 4 = Mn). Use of the hexacyano-3,4-diazahexadienediide anion [(NC)(2)CC(CN)NNC(CN)C(CN)(2)(2-)] instead of pcp(-) did not afford polynitrile metal complexes but led to a new organic derivative 5, of formula C10N8H2. Crystallographic studies indicated that the isostructural compounds 1 and 2 involve discrete monomeric units with pcp ligands acting with a monodentate coordination mode and having the metal in a pseudooctahedral trans-MN2O4 environment; however, a rich hydrogen bond system gives rise to a 3D array. Complex 3, which presents metal in a pseudooctahedral MN6 environment, has a 3D structure arising from pep ligands having an unprecedented mu(3)-coordination mode. Compound 5 is a bicyclic derivative with a pyrazolo[1,5-a]pyrimidine skeleton. In all derivatives, the organic part is essentially planar and involves a strongly delocalized pi system. The magnetic properties of the inorganic complexes have been studied in the 2-300 K range, Fit of the magnetic data indicates high spin complexes with weak antiferromagnetic interactions in 2, 3 and 4 and the presence of a significant zero field splitting of the Fe(II) ion in 1.
  • Li, C. Z.; Mardesic, P. & Roussarie, R.
    | Perturbations of symmetric elliptic Hamiltonians of degree four
    | Journal of Differential Equations, 2006 , 231 , 78-91 , DOI 10.1016/j.jde.2006.07.016 | Mathematics | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    In this paper four-parameter unfoldings X, of symmetric elliptic Hamiltonians of degree four are studied. We prove that in a compact region of the period annulus of X-0 the displacement function of X-lambda is sign equivalent to its principal part, which is given by a family induced by a Chebychev system; and we describe the bifurcation diagram of X, in a full neighborhood of the origin in the parameter space, where at most two limit cycles can exist for the corresponding systems. (c) 2006 Elsevier Inc. All rights reserved.
  • Melkemi, K. E.; Batouche, M. & Foufou, S.
    | A multiresolution approach based on MRF and Bak-Sneppen models for image segmentation
    | Informatica, 2006 , 17 , 225-236 | Computer Science, Information Systems; Mathematics, Applied | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    The two major Markov Random Fields (MRF) based algorithms for image segmentation are the Simulated Annealing (SA) and Iterated Conditional Modes (ICM). In practice, compared to the SA, the ICM provides reasonable segmentation and shows robust behavior in most of the cases. However, the ICM strongly depends on the initialization phase. In this paper, we combine Bak-Sneppen model and Markov Random Fields to define a new image segmentation approach. We introduce a multiresolution technique in order to speed up the segmentation process and to improve the restoration process. Image pixels are viewed as lattice species of Bak-Sneppen model. The a-posteriori probability corresponds to a local fitness. At each cycle, some objectionable species are chosen for a random change in their fitness values. Furthermore, the change in the fitness of each species engenders fitness changes for its neighboring species. After a certain number of iteration, the system converges to a Maximum A Posteriori estimate. In this multireolution approach, we use a wavelet transform to reduce the size of the system.
  • Michelot, F.
    | The algebra eigenstates method for some systems with spin-like interactions
    | Physics Letters A, 2006 , 354 , 200-209 , DOI 10.1016/j.physleta.2006.01.049 | Physics, Multidisciplinary | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    An extension of the algebra eigenstates formalism is proposed to solve the eigenvalue equation for a class of problems involving "spin interactions". The method is detailed for the harmonic oscillator, su(2) and su(1, 1) algebras. Special emphasis is given to the resolution of problems in vibronic spectroscopy involving doubly degenerate electronic states. (c) 2006 Elsevier B.V. All rights reserved.
  • Moser-Jauslin, L. & Poloni, P. M.
    | Embeddings of a family of Danielewski hypersurfaces and certain C+-actions on C-3
    | Annales De L Institut Fourier, 2006 , 56 , 1567-1581 | Mathematics | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    We consider the family of polynomials in C[x, y, z] of the form x(2)y - z(2) - xq(x, z). Two such polynomials P-1 and P-2 are equivalent if there is an automorphism phi* of C [x, y, z] such that phi* (P-1) = P-2. We give a complete classification of the equivalence classes of these polynomials in the algebraic and analytic category. As a consequence, we find the following results. There are explicit examples of inequivalent polynomials P-1 and P-2 such that the zero set of P-1 + c is isomorphic to the zero set of P-2 + c for all c epsilon C. There exist polynomials which are algebraically inequivalent but analytically equivalent. There exist polynomials which are algebraically inequivalent but when considered as polynomials in C [x, y, z, w] become equivalent. This last result answers a problem posed in [7]. Finally, we get a complete classification of C+-actions on C-3 which are defined by a triangular locally nilpotent derivation of the form x2a/az + (2z + xq(x, z))a/ay.
  • Neige, P.
    | Morphometrics of hard structures in cuttlefish
    | Vie Et Milieu-life and Environment, 2006 , 56 , 121-127 | Ecology; Marine & Freshwater Biology | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Cuttlefishes exhibit several hard structures that have been characterised using morphometric analysis. Most of these data come from cuttlebones. although statoliths and beaks are also used. It appears that morphometric techniques are mainly used for taxonomic purposes. However. some analyses have emphasised functional morphology and macroevolution. Morphological features (including, the inner shell) of cuttlefishes and their availability for study (numerous specimens, culture in the laboratory) make them a first rank model for numerous studies in life sciences that require morphometrics, and especially in the field of evolutionary biology.
  • Peereman, R.; Brand, M. & Rey, A.
    | Letter-by-letter processing in the phonological conversion of multiletter graphemes: Searching for sounds in printed pseudowords
    | Psychonomic Bulletin & Review, 2006 , 13 , 38-44 | Psychology, Mathematical; Psychology, Experimental | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    Current models of word reading differ in their descriptions of how print-to-sound conversion is performed. Whereas a parallel procedure is generally assumed, the dual-route cascaded model developed by Coltheart and colleagues (Coltheart, Rastle, Perry, Langdon, & Ziegler, 2001) holds that the nonlexical conversion operates letter by letter, serially from left to right. An interesting aspect of the hypothesized serial procedure is that only the first letter of two-letter graphemes is thought to cause activation of its corresponding phonological code, the second letter of multiletter graphemes being directly merged with the preceding letter to form a complex grapheme. This hypothesis was examined in a task in which participants had to detect target phonemes in visually presented pseudowords. The data suggest that phonological codes associated with all the letters of the multiletter graphemes are activated.
  • Perron, B. & Rolfsen, D.
    | Invariant ordering of surface groups and 3-manifolds which fibre over S-1
    | Mathematical Proceedings of the Cambridge Philosophical Society, 2006 , 141 , 273-280 , DOI 10.1017/S0305004106009558 | Mathematics | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    It is shown that, if Sigma is a closed orientable surface and phi: Sigma --> Sigma a homeomorphism, then one can find an ordering of pi(1)(Sigma) which is invariant under left- and right-multiplication, as well as under phi(*): pi(1) (Sigma) --> pi(1) (Sigma), provided all the eigenvalues of the map induced by phi on the integral first homology groups of Sigma are real and positive. As an application, if M-3 is a closed orientable 3-manifold which fibres over the circle; then its fundamental group is bi-orderable if the associated homology monodromy has all eigenvalues real and positive. This holds, in particular, if the monodromy is in the Torelli subgroup of the mapping class group of Sigma.
  • Quiquerez, A. & Dromart, G.
    | Environmental control on granular clinoforms of ancient carbonate shelves
    | Geological Magazine, 2006 , 143 , 343-365 , DOI 10.1017/S0016756806001749 | Geosciences, Multidisciplinary | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    The purpose of this paper is to document the influence of depositional environments on shallow-water, low-relief clinoforms from the description of five ancient carbonate platforms: the Neoproterozoic (Namibia), Middle Jurassic (France), Lower Cretaceous (France), Upper Cretaceous (Oman) and Miocene (Turkey). These examples have been investigated on the basis of field observations. The clinoforms are described with reference to geometric and compositional attributes: declivity, shape, height, sedimentary structures, sediment fabric and components. The results show great variability in stratal geometry, declivity and facies distribution: (1) depositional profiles vary from exponential, to sigmoidal, to oblique; (2) maximal slope angles range from 3 to 25 degrees, most of them being grouped between 10 and 18 degrees; (3) facies differentiation identified from lateral facies successions along beds, and vertical facies successions through beds, is pronounced to subtle. This study documents linkages between depositional environments and clinoform attributes. Proximal/shallow clinoforms display round-edged exponential profiles. Sediment deposition has resulted from unidirectional currents in the upper convex section, and storm-generated oscillatory currents in the lower concave part. The sediment fabric changes gradually along this type of clinoform. There is little vertical facies differentiation through these clinobeds which have formed from a continuous amalgamation of deposits. By contrast, distal clinoforms (shelf break, distally steepened ramp settings) yield a much broader spectrum of profiles and are generally shorter and steeper. Sedimentary structures in gravel-sized deposits of the upper slope indicate pure traction by unidirectional currents. Conversely, marks of oscillatory flows (undular, wavy top bounding surfaces of clinobeds) are common in the lower slope. Intercalation of massive, fine-grained deposits suggests offshore transport of carbonate mud by suspension. Each distal clinobed represents a single flow event. Accordingly, facies differentiation is weak laterally but may be pronounced through the clinobeds. Our study suggests that low-relief forms of proximal/shallow environments, which contain coarse-grained and photo-independently produced debris, record hydrodynamic equilibrium profiles, whereas the higher-relief forms of this setting rather reflect a high differential production rate of carbonate sediment with water depth. The carbonate sediment of the distal clinobeds mainly derives from skeletal production by oligophotic and photo-independent biota of the middle shelf/ramp and upper portion of the clinoforms. The contribution by in situ skeletal biota only becomes significant on the lower slope, indicating that the distal, submerged slopes of carbonate platforms are not organically but hydrodynamically generated. Our compilation shows that the slope angles of shallow marine, low-relief clinoforms do not simply correlate to the sediment grain size and fabric, in contrast to what has been documented for the high, linear slope profiles. This difference stems from the depositional settings, namely the involved transport mechanisms. Low-relief clinoform accretion seems to be dominantly influenced by wave-induced sediment transport, in contrast to linear flanks of high-relief clinoforms that build to the angle of repose, and for which gravity is the primary transport process.
  • Raballand, W.; Rotger, M.; Boudon, V.; Loete, M.; Breidung, J. & Thiel, W.
    | Stark effect in X2Y4 molecules: Application to ethylene
    | Journal of Molecular Structure, 2006 , 780-81 , 70-79 , DOI 10.1016/j.molstruc.2005.04.051 | Chemistry, Physical | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We present a development of the dipole moment and polarizability operators Of X2Y4 molecules, using a tensorial formalism analogous to the one developed for tetrahedral and octahedral molecules [V. Boudon, J.-P. Champion, T. Gabard, M. Loete, F. Michelot, G. Pierre, M. Rotger, Ch. Wenger, M. Rey, J. Mol. Spectrosc. 228 (2004) 620-634]. These operators are involved in the calculation of the intensities of rovibrational transitions as well as in the calculation of the Stark effect. Expressions for the matrix elements are derived. A model for the study of the Stark effect in isolated bands of such molecules is proposed and has been used to predict the Stark spectra of the v(12) band of ethylene. Values of the polarizability coefficients have been calculated using ab initio methods. (c) 2005 Elsevier B.V. All rights reserved.
  • Rossignol, J. & Thionnet, A.
    | A novel technique for microwave detection of damage in composite materials using a microstrip resonator.
    | Comptes Rendus Mecanique, 2006 , 334 , 719-724 , DOI 10.1016/j.crme.2006.10.003 | Mechanics | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    In this article, we present an innovative non-destructive method of detecting damage in composite materials. The method is based on the observation and analysis of the modifications in a material's dielectric properties that result from damage. The originality of this method comes from the fact that the diagnostic is obtained by using a microstrip, resonator submitted to a microwave electromagnetic field. In this Note, the method's feasibility is demonstrated by the detection of fibre ruptures in a unidirectional composite submitted to flexural loading. (c) 2006 Academie des sciences. Publie par Elsevier Masson SAS. Tons droits reserves.
  • Rotger, M.; Boudon, V.; Loete, M.; Zvereva-Loete, N.; Margules, L.; Demaison, J.; Merke, I.; Hegelund, F. & Burger, H.
    | The bending triad of the quasi-spherical top molecule SO2F2 in the 550 cm(-1) region
    | Journal of Molecular Spectroscopy, 2006 , 238 , 145-157 , DOI 10.1016/j.jms.2006.04.014 | Physics, Atomic, Molecular & Chemical; Spectroscopy | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    The analysis of the v(3)/v(7)/v(9) bending triad of SO2F2 has been recently performed with the Watson's Hamiltonian up to octic terms employing 79 rovibrational parameters but including only the first order Coriolis interaction terms, fixed to ab initio values [H. Burger, J. Demaison, F. Hegelund, L. Margules, I. Merke, J. Mol. Struct. 612 (2002) 133-141]. Since SO2F2 is a quasi-spherical top, it can also be considered as derived from the SO42- sulfate ion. We have thus developed a new tensorial formalism in the O(3) superset of T-d superset of C-2 upsilon group chain [M. Rotger, V. Boudon, M. Loete, J. Mol. Spectrosc. 216 (2002) 297-307]. This approach allows a systematic development of rovibrational interactions and makes global analyses easier to perform even for complex polyad systems. We present here an application of this model to the analysis of the bending triad, with the same set of microwave assignments and almost the same set of infrared assignments as in the previous study of Burger et al. It appears that we need to expand our Hamiltonian to a lower degree than the "classical" one (six instead of eight) when including also the second order Coriolis interactions. Our fit does not include more parameters. Furthermore, all of them are determined and the standard deviation of the rotational transitions is twice smaller. The analysis has been performed thanks to the C-2 upsilon TDS program suite, which is freely available at the URL: http://www.u-bourgogne.fr/LPUB/c2vTDS.htm1. (c) 2006 Elsevier Inc. All rights reserved.
  • Thionnet, A. & Martin, C.
    | A new constructive method using the theory of invariants to obtain material behavior laws
    | International Journal of Solids and Structures, 2006 , 43 , 325-345 , DOI 10.1016/j.iisolstr.2005.05.021 | Mechanics | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    The aim of this paper is to present a constructive method to derive mechanical behavior laws using the Theory of Invariants and Continuum Thermodynamics. More precisely, we want to construct, in a general way, the state or dissipation potential in a polynomial form given a set of variables Valid the material symmetry group S. For this purpose, we show how to obtain a set of generators for the S-invariant polynomials of V. Then, using the Groebner basis concept, we write all the decompositions of a polynomial of a given degree. (c) 2005 Elsevier Ltd. All rights reserved.
  • Tonello, A. & Wabnitz, S.
    | Switching off polarization modulation instabilities in photonic crystal fibers
    | Ieee Photonics Technology Letters, 2006 , 18 , 953-955 , DOI 10.1109/LPT.2006.873569 | Engineering, Electrical & Electronic; Optics; Physics, Applied | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    By considering the full frequency-dependent dispersion and birefringence properties of a photonic crystal fiber, we found that fourth-order dispersion has a striking influence on the spectrum of modulation polarization instabilities with either group or phase birefringence phase matching. The lower threshold is frustrated and an upper threshold is created for linear birefringence values that lead to parametric gain.
  • Tonello, A.; Wabnitz, S. & Boyraz, O.
    | Duty-ratio control of Nonlinear phase noise in dispersion-managed WDM transmissions using RZ-DPSK modulation at 10 Gb/s
    | Journal of Lightwave Technology, 2006 , 24 , 3719-3726 , DOI 10.1109/JLT.2006.882238 | Engineering, Electrical & Electronic; Optics | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    The authors compare analytical and numerical estimates, showing that the nonlinear phase noise of short optical pulses associated with the coupling between amplified spontaneous emission noise and fiber nonlinearity may be controlled by adjusting the duty cycle of the return-to-zero (RZ) signal modulation format. The impact of this effect in the optimization of the performance of 10-Gb/s dispersion-managed wavelength division multiplexed (WDM) systems using RZ-differential phase-shift keying (DPSK) modulation is discussed. By extensive numerical simulations, it is shown that the transmission quality of ultradense WDM systems using the RZ-DPSK modulation format may be significantly enhanced by optimizing the duty cycle of the RZ pulses.
  • Villas, E.; Vizcaino, D.; Alvaro, J. J.; Destombes, J. & Vennin, E.
    | Biostratigraphic control of the latest-Ordovician glaciogenic unconformity in Alnif (Eastern Anti-Atlas, Morocco), based on brachiopods
    | Geobios, 2006 , 39 , 727-737 , DOI 10.1016/j.geobios.2005.05.003 | Paleontology | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    In the Alnif region of the Eastern Atlas (Morocco), seven fossiliferous horizons within the Lower-Ktaoua and Upper-Tioutirine formations (Ktaoua Group), as well as in the glaciomarine microconglomeratic shales of the Upper Formation of the Second-Bani Group have yielded biostratigraphically significant brachiopods and other taxa, such as trilobites and echinoderms. Several brachiopod species with short stratigraphic ranges, well-known in south-western Europe, allow a precise chronostratigraphic control of a succession that displays important lateral lithological and facies changes, when compared with the type sections in the Central Anti-Atlas. They have also permitted a better consensus between the macrofauna-determined age and that based on micropalcontological analyses. For the first time, the occurrence of a Hirnantia Fauna within the microconglomeratic shales of the Upper Formation of the Second Bani Group is reported. The biostratigraphic conclusions restrict the age of the Latest Ordovician glaciation to the early Hirnantian. (c) 2006 Elsevier Masson SAS. All rights reserved.
  • Wattier, R. A.; Beguet, J.; Gaillard, M.; Muller, J. C.; Bollache, L. & Perrot-Minnot, M. J.
    | Molecular markers for systematic identification and population genetics of the invasive Ponto-Caspian freshwater gammarid Dikerogammarus villosus (Crustacea, Amphipoda)
    | Molecular Ecology Notes, 2006 , 6 , 487-489 , DOI 10.1111/j.1471-8286.2006.01283.x | Biochemistry & Molecular Biology; Ecology; Evolutionary Biology | cited 1 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    The Ponto-Caspian amphipod, Dikerogammarus villosus, is an invasive species of many European rivers. First, we show that size difference of nrDNA ITS1 allows discriminating D. villosus from Dikerogammarus bispinosus, a closely related but morphologically hardly distinguishable species. Second, we present two types of polymorphic markers for D. villosus, three microsatellites and two single nucleotide polymorphisms (SNPs) of mtDNA COI gene, which were scored by polymerase chain reaction-single strand conformational polymorphism (PCR-SSCP). These markers will be very useful in studying population genetics of D. villosus.
  • Abreu, A. M.; French, R. M.; Cowell, R. A. & De Schonen, S.
    | Local-global visual deficits in Williams syndrome: Stimulus presence contributes to diminished performance on image-reproduction
    | Psychologica Belgica, 2006 , 46 , 269-281 | Psychology, Multidisciplinary | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    Impairments in visuospatial processing exhibited by individuals with Williams Syndrome (WS) have been ascribed to a local processing bias. The imprecise specification of this local bias hypothesis has led to contradictions between different accounts of the visuospatial deficits in WS. We present two experiments investigating visual processing of geometric Navon stimuli by children with WS. The first experiment examined image reproduction in a visuoconstruction task and the second experiment explored the effect of manipulating global salience on recognition of visual stimuli by varying the density of local elements possessed by the stimuli. In the visuoconstruction task, the children with WS did show a local bias with respect to controls, but only when the target being copied was present; when drawing from memory, subjects with WS produced a heterogeneous pattern of answers. In the recognition task, children with WS exhibited the same sensitivity to global figures as matched controls, confirming previous findings in which no local bias in perception was found in WS subjects. We propose that subjects with WS are unable to disengage their attention from local elements during the planning stage of image reproduction (a visual-conflict hypothesis).
  • Alias, L. J.; Kurose, T. & Solanes, G.
    | Hadamard-type theorems for hypersurfaces in hyperbolic spaces
    | Differential Geometry and Its Applications, 2006 , 24 , 492-502 , DOI 10.1016/j.difgeo.2006.02.008 | Mathematics, Applied; Mathematics | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    We prove that a bounded, complete hypersurface in hyperbolic space with normal curvatures greater than -1 is diffeomorphic to a sphere. The completeness condition is relaxed when the normal curvatures are bounded away from -1. The diffeomorphism is constructed via the Gauss map of some parallel hypersurface. We also give bounds for the total curvature of this parallel hypersurface. (C) 2006 Elsevier B.V. All rights reserved.
  • Aubreton, O.; Voon, L. F. C. L. Y.; Lamalle, B. & Cathebras, G.
    | A new method for implementing moment functions in a CMOS retina
    | Machine Vision and Applications, 2006 , 16 , 384-392 , DOI 10.1007/s00138-005-0010-2 | Computer Science, Artificial Intelligence; Computer Science, Cybernetics; Engineering, Electrical & Electronic | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    We present in this paper a new method for implementing geometric moment functions in a CMOS retina. The principle is based on the similarity between geometric moment equations and the measurement of the correlation value between an image to analyze and a range of grey levels. The latter is approximated by a binary image called mask using a dithering algorithm in order to reduce hardware implementation cost. The correlation product between the mask and the image under analysis gives an approximated value of the geometric moment with an error less than 1% of the exact value. Finally, the results obtained by our approach have been applied to an object localization application and the localization error due to the approximated moment values reported.
  • Badr, Y. & Chbeir, R.
    | Automatic image description based on textual data
    | Journal On Data Semantics Vii, 2006 , 4244 , 196-218 | Computer Science, Theory & Methods | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    In the last two decades, images are quite produced in increasing amounts in several application domains. In medicine, for instance, a large number of images of various imaging modalities (e.g. computer tomography, magnetic resonance, nuclear imaging, etc.) are produced daily to support clinical decision-making. Thereby, a fully functional Image Management System becomes a requirement to the end-users. In spite of current researches, the practice has proved that the problem of image management is highly related to image representation. This paper contribution is twofold in facilitating the representation of images and the extraction of its content and context descriptors. In fact, we introduce an expressiveness and extendable XML-based meta-model able to capture the metadata and content-based of images. We also propose an information extraction approach to provide automatic description of image content using related metadata. It automatically generates XML instances, which mark up metadata and salient objects matched by extraction patterns. In this paper, we illustrate our proposal by using the medical domain of lungs x-rays and we show our first experimental results.
  • Bellach, B.; Cathebras, G.; Voon, L. F. C. L. Y.; Aubreton, O. & Lamalle, B.
    | CMOS image sensor for spatiotemporal image acquisition
    | Journal of Electronic Imaging, 2006 , 15 , 020502 , DOI 10.1117/1.2191767 | Engineering, Electrical & Electronic; Optics; Imaging Science & Photographic Technology | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    We present a 64-x64-pixel CMOS image sensor chip that can acquire a 16-gray-level image containing both spatial and temporal information of the moving luminous object under observation. The image can next be processed using any image processing software in order to determine the speed, trajectory, and direction of motion of the moving object. The architecture of the sensor and an example of its application to the determination of the speed of a moving laser spot are described. (C) 2006 SPIE and IS&T.
  • Bernardin, S.; Portrat, S. & Barrouillet, P.
    | On the role of the nature and rhythm of completion of the secondary task on working memory spans
    | Annee Psychologique, 2006 , 106 , 23-42 | Psychology, Multidisciplinary | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    Working memory span tasks require participants to maintain items in short term memory while performing some concurrent processing (e.g., reading, counting, problem solving). The aim of the present experiment was to contrast two hypotheses about the locus of the detrimental effect of the processing component on the maintenance of items. Does processing impede maintenance because both components share some basic cognitive processes and supplies, as suggested by the Time-Based Resource-Sharing model (Barrouillet, Bernardin, & Camos, 2004), or more simply because the strategies of maintenance are disrupted by the appearance of items to be concurrently processed. Eighty adult participants were given working memory span tasks in which they had to maintain letters while they judged either the parity (odd/even) or the spatial position (top/bottom) of series of numbers sequentially displayed on screen. Moreover, these numbers appeared either at a regular or at an unpredictable rhythm. In line with our expectations, and contrary to the hypothesis of a disruption of mnemonic strategies, parity judgements that require memory retrievals resulted in lower spans than the spatial judgements that rely on simple selection of response, while the rhythm of completion of the secondary task did not affect spans.
  • Bertolim, M. A.; de Rezende, K. A. & Vago, G. M.
    | Minimal Morse flows on compact manifolds
    | Topology and Its Applications, 2006 , 153 , 3450-3466 , DOI 10.1016/j.topol.2006.03.005 | Mathematics, Applied; Mathematics | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    In this paper we prove, using the Poincare-Hopf inequalities, that a minimal number of non-degenerate singularities can be computed in terms only of abstract homological boundary information. Furthermore, this minimal number can be realized on some manifold with non-empty boundary satisfying the abstract homological boundary information. In fact, we present all possible indices and types (connecting or disconnecting) of singularities realizing this minimal number. The Euler characteristics of all manifolds realizing this minimal number are obtained and the associated Lyapunov graphs of Morse type are described and shown to have the lowest topological complexity. (C) 2006 Elsevier B.V.. All rights reserved.
  • Bouchet, T.
    | The absolute discrepancy of banquets. Fourier, Le 'Nouveau Monde Amoureux'
    | Australian Journal of French Studies, 2006 , 43 , 262-276 | Literature, Romance | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : UMR5605 )
  • 2010.05.25
    Abstract:
  • Bourgeat, P.; Meriaudeau, F.; Tobin, K. W. & Gorria, P.
    | Gabor filtering for feature extraction on complex images: application to defect detection on semiconductors
    | Imaging Science Journal, 2006 , 54 , 200-210 , DOI 10.1179/174313106X110129 | Imaging Science & Photographic Technology | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    This paper is an extension of previous work on the image segmentation of electronic structures on patterned wafers to improve the defect detection process on optical inspection tools. Die-to-die wafer inspection is based upon the comparison of the same area on two neighbourhood dies. The dissimilarities between the images are a result of defects in this area of one of the dies. The noise level can vary from one structure to the other, within the same image. Therefore, segmentation is needed to create a mask and apply an optimal threshold in each region. Contrast variation on the texture can affect the response of the parameters used for the segmentation. This paper shows a method of anticipating these variations with a limited number of training samples and modifying the classifier accordingly to improve the segmentation results.
  • Broer, H. W.; Naudot, V. & Roussarie, R.
    | Catastrophe theory in Dulac unfoldings
    | Ergodic Theory and Dynamical Systems, 2006 , 26 , 1363-1397 , DOI 10.1017/S0143385706000289 | Mathematics, Applied; Mathematics | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    In this paper we study analytic properties of compensator and Dulac expansions in a single variable. A Dulac expansion is formed by monomial terms that may contain a specific logarithmic factor. In compensator expansions this logarithmic factor is deformed. We first consider Dulac expansions when the power of the logarithm is either 0 or 1. Here we construct an explicit exponential scaling in the space of coefficients which in an exponentially narrow horn, up to rescaling and division, leads to a polynomial expansion. A similar result holds for the compensator case. This result is applied to the bifurcation theory of limit cycles in planar vector fields. The setting consists of families that unfold a given Hamiltonian in a dissipative way. This leading part is of Morse type, which leads to the following three cases. The first concerns a Hamiltonian function that is regular on an annulus, and the second a Hamiltonian function with a non-degenerate minimum defined on a disc. In the third case the Hamiltonian function has a non-degenerate saddle point with a saddle connection. The first case, by an appropriate scaling, recovers the generic theory of the saddle node of limit cycles and its cuspoid degeneracies, while the second case similarly recovers the generic theory of limit cycles subordinate to the codimension k Hopf bifurcations k = 1, 2,.... The third case enables a novel study of generic bifurcations of limit cycles subordinate to homoclinic bifurcations. We then describe how the above analytic result is applied to bifurcations of limit cycles. For appropriate one-dimensional Poincare maps, the fixed points correspond to the limit cycles. The fixed point sets (or zero-sets of the associated displacement functions) are studied by contact equivalence singularity theory. The cases where the Hamiltonian is defined on an annulus or a disc can be reduced directly to catastrophe theory. In the third case, the displacement functions are known to have compensator expansions, whose first approximations are Dulac expansions. Application of our analytic result implies that, in an exponentially narrow horn near a homoclinic loop, the bifucation theory of limit cycles again reduces to catastrophe theory.
  • Brygo, F.; Semerok, A.; Weulersse, J. M.; Thro, P. Y. & Oltra, R.
    | Laser ablation of a turbid medium: Modeling and experimental results
    | Journal of Applied Physics, 2006 , 100 , 033106 , DOI 10.1063/1.2220647 | Physics, Applied | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    Q- switched Nd:YAG laser ablation of a turbid medium ( paint ) is studied. The optical properties ( absorption coefficient, scattering coefficient, and its anisotropy ) of a paint are determined with a multiple scattering model ( three-flux model ), and from measurements of reflection-transmission of light through thin layers. The energy deposition profiles are calculated at wavelengths of 532 nm and 1.064 mu m. They are different from those described by a Lambert-Beer law. In particular, the energy deposition of the laser beam is not maximum on the surface but at some depth inside the medium. The ablated rate was measured for the two wavelengths and compared with the energy deposition profile predicted by the model. This allows us to understand the evolution of the ablated depth with the wavelength: the more the scattering coefficient is higher, the more the ablated depth and the threshold fluence of ablation decrease. (c) 2006 American Institute of Physics.
  • Brzezniak, Z. & Leandre, R.
    | Fellerian pants
    | Comptes Rendus Mathematique, 2006 , 343 , 333-338 , DOI 10.1016/j.crma.2006.07.003 | Mathematics | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    Given a manifold M we define a Banach space E associated with the loop space L(M) of M in such a way that the random pants realize a continuous map from the injective tensor product E (circle times) over cap E-epsilon into E. Our research is motivated by one of the axioms of conformal field theory of G. Segal. Full details will be presented in a forthcoming article.
  • Cavicchioli, A.; Paoluzzi, L. & Spaggiari, F.
    | On the classification of Kim and Kostrikin manifolds
    | Journal of Knot Theory and Its Ramifications, 2006 , 15 , 549-569 | Mathematics | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    We completely classify the topological and geometric structures of some series of closed connected orientable 3-manifolds introduced by Kim and Kostrikin in [20,21] as quotient spaces of certain polyhedral 3-cells by pairwise identifications of their boundary faces. Then we study further classes of closed orientable 3-manifolds arising from similar polyhedral schemata, and describe their topological properties.
  • Chartrel, E. & Vinter, A.
    | The role of visual information in the production of cursive letters in children and adults
    | Annee Psychologique, 2006 , 106 , 43-63 | Psychology, Multidisciplinary | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5022 )
  • 2010.05.25
    Abstract:
    The present experiment aims at studying the evolution with age of the role of visual information in the production of isolated cursive letters. Children aged 8, 9 and 10 year-old and adults were asked to write different cursive letters (a, o, l, m and p) under three experimental conditions: with a normal vision, under an opaque open box that prevented vision from the hand and the trace, or without any visual information. The partial or complete withdrawal of visual information had a much greater effect on the children's performances than on those of adults. Only an increase of pressure was observed in adults following the removal of visual information, while children compensated for the absence of visual feedback by increasing movement length, movement velocity, and pressure. By contrast, they maintained movement duration constant throughout the conditions. However, a non monotone development with age of some of these kinematic parameters was revealed. Moreover, the effect of visual information withdrawal on movement parameters differed as a function of the type of letter produced. Globally, these results showed that children relied much more than adults on visual feedback when they wrote, even for the simple production of isolated letters.
  • Chevaldonne, M.; Ballaz, C.; Merienne, F.; Neveu, M.; Chevassus, N.; Guillaume, F. & Arbez, C.
    | Field-of-view tests for a virtual cockpit application
    | Journal of Electronic Imaging, 2006 , 15 , 020501 , DOI 10.1117/1.2189211 | Engineering, Electrical & Electronic; Optics; Imaging Science & Photographic Technology | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    The virtual cockpit application aims to perform ergonomics studies on future aircraft cockpits, directly from digital mock-ups. This is made possible by immersing a user in a digital mock-up with the help of virtual reality devices. The challenge is then to reproduce a realistic and exact visual environment. To do that, some visual criteria have to be determined: the necessary values of visual acuity, temporal resolution, and field of view. Some of them are easy to find, but the field-of-view requirement is far more subjective and complex to evaluate. We present tests which have helped us to determine the necessary and sufficient values of field of view for such an application. We advise then to use a field of view higher than 75 deg, for ergonomic studies and good performances of the users, and up to 133 deg to increase visual comfort. These results will be used for the specification of a head-mounted display for the application. (C) 2006 SPIE and IS&T.
  • Fellegara, A. & Wabnitz, S.
    | Impact of electrostriction-induced acoustic interactions on transmission performances of WDM signals over standard fibers
    | Ieee Photonics Technology Letters, 2006 , 18 , 202-204 , DOI 10.1109/LPT.2005.861633 | Engineering, Electrical & Electronic; Optics; Physics, Applied | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    We study the effect of power and phase distortions as induced by cross-phase modulation and electrostrictive nonlinearity in dispersive optical fibers. We obtain, evaluate, and discuss simple analytical expressions for the intensity and phase crosstalk in the presence of electrostriction between two wavelength channels copropagating in a standard, step core index profile fiber. The present model provides a simple estimate of the impact of electrostriction on the transmission performance of fiber optic communication systems.
  • Flam, S. D. & Jourani, A.
    | Prices and Pareto optima
    | Optimization, 2006 , 55 , 611-625 , DOI 10.1080/02331930600808434 | Operations Research & Management Science; Mathematics, Applied | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    We provide necessary conditions for Pareto optimum in economies where tastes or technologies may be nonconvex, nonsmooth, and affected by externalities. Firms can pursue own objectives, much like the consumers. Infinite-dimensional commodity spaces are accommodated. Public goods and material balances are accounted for as special instances of linear restrictions.
  • Franco, N. & Paris, L.
    | On a theorem of Artin. II
    | Journal of Group Theory, 2006 , 9 , 731-751 , DOI 10.1515/JGT.2006.047 | Mathematics | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    This paper is a sequel to [8]. Let A be an Artin group, let W be its associated Coxeter group, and let CA be its associated coloured Artin group, that is, the kernel of the standard epimorphism mu : A --> W. We determine the homomorphisms phi : A --> W that satisfy Im phi . Z(W) = W, for A irreducible and of spherical type, and we prove that CA is a characteristic subgroup of A if A is of spherical type but not necessarily irreducible.
  • Franco, N.
    | Conjugacy problem for subgroups with applications to Artin groups and braid type group
    | Communications In Algebra, 2006 , 34 , 4207-4215 , DOI 10.1080/00927870600876375 | Mathematics | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    Let G be a group endowed with a solution to the conjugacy problem and with an algorithm: which computes the centralizer in G of any element of G. Let H be a subgroup of G. We give some conditions on H, under which we provide a solution to the conjugacy problem in H. We apply our results to some Artin groups and braid type groups. In particular, we give solutions to the explicit conjugacy problem in the Artin groups of type (A) over tilde (n) and (C) over tilde (n).
  • Imhoff, L.; Heintz, O.; Gauthier, V.; de Lucas, C. M. & Bourgeois, S.
    | Chemical characterization of gallium droplets grown by LP-MOCVD
    | Applied Surface Science, 2006 , 253 , 2820-2824 , DOI 10.1016/j.apsusc.2006.05.062 | Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    This study is concerned with the chemical characterization of metallic gallium droplets, obtained on silicon (1 0 0) substrates with a single growth step, by the LP-MOCVD technique with TMGa like precursor. These structures are characterized by SIMS, XPS and TEM. The analyses results lead to a structure proposition for the droplets. The core is composed of metastable metallic gallium with a non-negligible carbon quantity probably coming from incomplete precursor decomposition. The outer part, composed of gallium oxide maintains the structure stability. Covering of the substrate by a thin gallium layer of gallium compounds is observed. (c) 2006 Elsevier B.V. All rights reserved.
  • Jolivet, S.
    | The fashion phenomenon at the court of Burgundy under Philip the Good: the example of robes from 1430 to 1442
    | Revue Du Nord, 2006 , 88 , 331-+ | History | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : UMR5594 )
  • 2010.05.25
    Abstract:
    This paper aims at approaching fashion phenomena at the court of Philip the Good, Duke of Burgundy through the careful study of its accounting records. After documenting the evolution of fashion trends through the examples of the robes worn by the duke and his suite between 1430 and 1442, we could show that shorter times (bearing on points of detail) and longer times (characterized by an evolution of the figure) were well established in this court environment. We attempted at accounting for these alterations, taking into consideration the aesthetic, cultural and from a certain point of view diplomatic criteria inherent to the obligations of essentially public figures. Thus the adoption of regional features, such as the Dutch fashion in 1432 or the Bourbon fashion in 1442, can be read in reference with the political message that the duke wanted to send his audience: in the former case his new Dutch subjects, in the latter one an important partner in the political life of the Kingdom of France.
  • Kazantsev, V. B.; Nekorkin, V. I.; Morfu, S.; Bilbault, J. M. & Marquie, P.
    | Propagating interfaces in a two-layer bistable neural network
    | International Journal of Bifurcation and Chaos, 2006 , 16 , 589-600 | Mathematics, Interdisciplinary Applications; Multidisciplinary Sciences | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    The dynamics of propagating interfaces in a bistable neural network is investigated. We consider the network composed of two coupled 1D lattices and assume that they interact in a local spatial point (pin contact). The network unit is modeled by the FitzHugh-Nagumo-like system in a bistable oscillator mode. The interfaces describe the transition of the network units from the rest (unexcited) state to the excited state where each unit exhibits periodic sequences of excitation pulses or action potentials. We show how the localized inter-layer interaction provides an '' excitatory '' or '' inhibitory '' action to the oscillatory activity. In particular, we describe the interface propagation failure and the initiation of spreading activity due to the pin contact. We provide analytical results, computer simulations and physical experiments with two-layer electronic arrays of bistable cells.
  • Kchikech, M. & Togni, O.
    | Approximation algorithms for multicoloring planar graphs and powers of square and triangular meshes
    | Discrete Mathematics and Theoretical Computer Science, 2006 , 8 , 159-171 | Computer Science, Software Engineering; Mathematics, Applied; Mathematics | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    A multicoloring of a weighted graph G is an assignment of sets of colors to the vertices of G so that two adjacent vertices receive two disjoint sets of colors. A multicoloring problem on G is to find a multicoloring of G. In particular, we are interested in a minimum multicoloring that uses the least total number of colors. The main focus of this work is to obtain upper bounds on the weighted chromatic number of some classes of graphs in terms of the weighted clique number. We first propose an 11/6-approximation algorithm for multicoloring any weighted planar graph. We then study the multicoloring problem on powers of square and triangular meshes. Among other results, we show that the infinite triangular mesh is an induced subgraph of the fourth power of the infinite square mesh and we present 2-approximation algorithms for multicoloring a power square mesh and the second power of a triangular mesh, 3-approximation algorithms for multicoloring powers of semi-toroidal meshes and of triangular meshes and 4-approximation algorithm for multicoloring the power of a toroidal mesh. We also give similar algorithms for the Cartesian product of powers of paths and of cycles.
  • Leandre, R.
    | Heat Kernel Measure on Central Extension of Current Groups in any Dimension
    | Symmetry Integrability and Geometry-methods and Applications, 2006 , 2 , 003 | Physics, Mathematical | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    We define measures on central extension of current groups in any dimension by using infinite dimensional Brownian motion.
  • Mathey, P.; Odoulov, S. & Rytz, D.
    | A new instability of counter-propagating waves in BaTiO3?
    | Applied Physics B-lasers and Optics, 2006 , 83 , 27-31 , DOI 10.1007/s00340-006-2135-z | Optics; Physics, Applied | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    The self-development of a strong reflection grating in a BaTiO3 sample illuminated with two mutually incoherent counter-propagating light waves is reported. The two transmitted waves diffracted from this grating become partially mutually coherent.
  • Matusinski, M. & Rolin, J. P.
    | Generalised power series solutions of sub-analytic differential equations
    | Comptes Rendus Mathematique, 2006 , 342 , 99-102 , DOI 10.1016/j.crma.2005.11.005 | Mathematics | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5584 )
  • 2010.05.25
    Abstract:
    We show that if a solution y(x) of a sub-analytic differential equation admits an asymptotic expansion Sigma(i=1)(infinity) c(i)x(mu i), mu(i) is an element of R+, then the exponents mu(i) belong to a finitely generated semi-group of R+. We deduce a similar result for the components of non-oscillating trajectories of real analytic vector fields in dimension n. To cite this article: M. Matusinski, J.-P. Rolill, C. R. Acad. Sci. Paris, Ser. 1342 (2006). (c) 2005 Academie des sciences. Published by Elsevier SAS. All rights reserved.
  • Michelucci, D. & Schreck, P.
    | Incidence constraints: A combinatorial approach
    | International Journal of Computational Geometry & Applications, 2006 , 16 , 443-460 | Computer Science, Theory & Methods; Mathematics, Applied | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    The simplest geometric constraints are incidences between points and lines in the projective plane. This problem is universal, in the sense that all algebraic systems reduce to such geometric constraints. Detecting incidence dependences between these geometric constraints is NP-complete. New methods to prove incidence theorems are proposed, which use strictly no computer algebra but only combinatorial arguments.
  • Pecou, E.
    | Desynchronization of one-parameter families of stable vector fields
    | Nonlinearity, 2006 , 19 , 261-276 , DOI 10.1088/0951-7715/19/2/001 | Mathematics, Applied; Physics, Mathematical | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT ; SVT / Code(s) unite(s) : UMR5584 ; ERITM207 )
  • 2010.05.25
    Abstract:
    Given a one-parameter family of vector fields on R-n, F-lambda(x), lambda is an element of I subset of R, such that for each lambda, F-lambda has a global asymptotically stable equilibrium point x(lambda), we construct a vector field on Rn+1 of the form G (lambda, x) = (g (lambda, x), F-lambda (x)) which exhibits chaotic behaviour. This result is an incursion in the inverse problem of master-slave synchronization. This paper discusses self-disorganization of parameter dependent stable vector fields. Motivations are found in applications to drug design: one way to lead an unfriendly organism to death is to destabilize its metabolism. In this paper we envisage the mathematical aspect of the question. We show that for a very stable system (one globally attracting equilibrium state) depending on one parameter, there is a way for the system to act on the parameter so as to create chaos.
  • Quesne, D. & Benard, D.
    | New interpretations on the relationships between lower Barremian calcarenites and rudistid facies in southern Vercors (South-East France).
    | Geodiversitas, 2006 , 28 , 421-432 | Paleontology | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    This work is focused on the limestones with rudistids (Monopleuridae and Requienidae of the lower Barremian and the base of the upper Barremian, essentially) of southern Vercors. It is particularly focused on the relationships, which exist between this facies and the Barremian calcarenites of this area. The geological logs we have constructed, and our photographic panoramas show that the pattern of the deposits is repetitive and indicates, for the calcarenites, a decrease of the hydrodynamism, which can be interpreted as the result of an increase of the accommodation. The underlying rudistids limestones, which settle before marts, or argillaceous limestones, seem to be included in a transgressive context. It is also shown that: 1) these two deposits are synchronous since they follow each other; and 2) the rudistids limestones, in the studied area, are never protected by a barrier. So, the rudistid limestones of southern Vercors can be considered as deposits settling during a transgressive period.
  • Russo, D.
    | Lectures on the Christian art in France and Europe in 1880-1920 - On the "medievalism"
    | Cahiers De Civilisation Medievale, 2006 , 49 , 373-380 | Medieval & Renaissance Studies | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SHS / Code(s) unite(s) : UMR5594 )
  • 2010.05.25
    Abstract:
    In the 19(th) and 20(th) centuries, when the vision of the Church as an << ideal society >> of believers was still dominant in the stir of the modernist crisis, the joint notions of Christianity and christian art became apparent to an entire current of thought marlied by neo-thomism. It is this moment, crucial to the understanding of the art of the Middle Ages, that needs to be reread.
  • Saucede, T.; Alibert, P.; Laurin, B. & David, B.
    | Environmental and ontogenetic constraints on developmental stability in the spatangoid sea urchin Echinocardium (Echinoidea)
    | Biological Journal of the Linnean Society, 2006 , 88 , 165-177 | Evolutionary Biology | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5561 )
  • 2010.05.25
    Abstract:
    Spatangoid irregular sea urchins are detritivorous benthic organisms particularly prone to variations of environment, and their mode of growth and plate morphology make them an appropriate model to assess the effects of environmental variations. Two populations of Echinocardium flavescens were sampled in two sites of the Norwegian coast characterized by contrasted environmental conditions. Different morphological descriptors (plate areas, interlandmarks distances, overall size, and shape of the posterior ambulacra) were used to appraise interindividual variations, and fluctuating asymmetry. The comparisons were carried out using classical fluctuating asymmetry (FA) methods, as well as Procrustean approaches. The population suspected to be less influenced by anthropic activities exhibits lower levels of FA for the size parameters (plate surfaces, interlandmarks distances, and centroid size) than the population located in a polluted area. Conversely, it shows higher FA values for the shape parameters (landmarks configuration). Interindividual variations appear to be correlated to FA. Variations are orientated according to the main growth axis of the ambulacra, and their intensity is stronger in the large posterior plates, which are also the youngest. These results are discussed with respect to architectural constraints involved in the sea urchin growth.
  • Seulin, R.; Stolz, C.; Fofi, D.; Millon, G. & Nicolier, F.
    | Three-dimensional tools for analysis and conservation of ancient wooden stamps
    | Imaging Science Journal, 2006 , 54 , 111-121 , DOI 10.1179/174313106X98755 | Imaging Science & Photographic Technology | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    This paper deals with the analysis and conservation of ancient wooden stamps from museum or library collections. The aim is to provide historians with tools that ease the process of handling and observation of very fragile and unique objects. By performing a three-dimensional imaging of stamps, data are processed in three different ways: ( 1) adaptive thresholding on the corresponding range image enables visualization for the first time of an image of the actual print produced by the stamp; ( 2) interactive enhanced rendering provides a realistic and non-photorealistic interactive visualization; and, finally, ( 3) rapid prototyping production gives a perfect geometrical facsimile of the stamps, preventing any hazards inherent in the handling of the originals.
  • Shamrakov, L. G.; Leonenko, Z. V.; Finot, E. & Cramb, D. T.
    | Interaction forces of a supported DOPC bilayer in the presence of the general anaesthetic halothane - An atomic force microscopy study
    | Australian Journal of Chemistry, 2006 , 59 , 386-389 , DOI 10.1071/CH06141 | Chemistry, Multidisciplinary | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    In this study atomic force microscopy (AFM) was used to study the effect of halothane on a supported dioleoylphosphatidylcholine ( DOPC) bilayer under conditions of high anaesthetic loading. In a previous study we demonstrated that bilayer restructuring occurs as a result of halothane incorporation. Force measurements using AFM indicate an initial decrease in adhesive forces and compressibility between the bilayer and AFM tip, followed by an increase in adhesion properties as a function of incubation time. This effect is attributed to the location and dynamic redistribution of halothane within the bilayer.
  • Truchetet, F.; Aubreton, O.; Gorria, P. & Laligant, O.
    | Attitude measurement by artificial vision
    | Measurement Science & Technology, 2006 , 17 , 101-110 , DOI 10.1088/0957-0233/17/1/017 | Engineering, Multidisciplinary; Instruments & Instrumentation | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SVT / Code(s) unite(s) : UMR5158 )
  • 2010.05.25
    Abstract:
    The recent development of light and low-cost airborne platforms (microlight, drones, kites, balloons,...) has led to the need for simple and low-cost devices allowing attitude measurement with respect to a reference horizon of the platform itself or of an embedded setting. A theoretical study of the conditions for measuring attitude angles from artificial vision is proposed and an original practical algorithm allowing these measurements to be performed in real time is described. An implementation in a CMOS retina circuit is also presented. These points are illustrated by experiments confirming the feasibility of the device.
  • Ustinov, A. I.; Boytsov, O.; Gaffet, E.; Champion, Y. & Bernard, F.
    | Effect of energy parameters of ball milling on microstructure of Cu nanostructured powder
    | Metallofizika I Noveishie Tekhnologii, 2006 , 28 , 503-519 | Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Condensed Matter | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5613 )
  • 2010.05.25
    Abstract:
    The microstructure evolution of Cu nanostructured powders at different conditions of the ball milling is investigated by the x-ray diffraction analysis. The characteristics of as-milled Cu-powder microstructure in terms of crystallite sizes, type, and density of dislocations as well as twin-faults' density are determined by the whole peak-profiles' modelling of powder x-ray diffraction pattern. By comparing of both microstructure characteristics of Cu powder and the ball milling parameters, the dominant factors of ball milling, which affect on the concentration of twin faults, type, and density of dislocations as well as the size of crystallites, are revealed.
  • Vysotina, N. V.; Rozanov, N. N.; Semenov, V. E.; Fedorov, S. V. & Wabnitz, S.
    | Dissipative extremely short localized structures of radiation
    | Optics and Spectroscopy, 2006 , 101 , 736-742 , DOI 10.1134/S0030400X06110130 | Optics; Spectroscopy | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    Sets of steady-state localized temporal structures of radiation with a duration comparable with the period corresponding to the frequency of atomic transitions are found for a medium consisting of active (with a pump) and passive (without a pump) atoms with homogeneous broadening. The velocity of motion of these structures takes discrete values depending on the number of field spikes and the number of oscillations of the polarization of the active and passive atoms within the intervals between the field spikes.
  • Wabnitz, S.
    | Signal processing in photonic crystals and nanostructures
    | Journal of Nonlinear Optical Physics & Materials, 2006 , 15 , 55-76 | Optics; Physics, Applied | cited 0 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : UMR5027 )
  • 2010.05.25
    Abstract:
    Optical devices employing photonic crystals and novel nanostructure materials may exhibit useful properties for applications to all-optical signal processing. In this work we analyze as a first example four-wave mixing of polarized beams in photonic crystal fibers. We show that by properly tuning the pump wavelength and the linear dispersion properties of the fiber one may obtain broadband parametric amplification and frequency conversion. Next we consider the in-line periodic amplification of short optical pulses by means of quantum-dot semiconductor optical amplifiers. We show by numerical simulations that pattern-free amplification of a 40 Gbit/s soliton signal at 1300 nm is possible without any inter-symbol interference or nonlinear pulse distortion caused by the fast gain dynamics.

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