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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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).
  • Mathieu, A.; Mattei, S.; Deschamps, A.; Martin, B. & Grevey, D.
    | Temperature control in laser brazing of a steel/aluminium assembly using thermographic measurements
    | Ndt & E International, 2006 , 39 , 272-276 , DOI 10.1016/j.ndteint.2005.08.005 | Materials Science, Characterization & Testing | cited 7 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : EA2976 ; EA1859 )
  • 2010.05.25
    Abstract:
    One way of making car bodies lighter is to introduce some aluminium parts in place of steel. Steel and aluminium can be joined by laser braze welding. As in other types of thermal joining, inter-metallic phases may weaken the joint. In laser braze welding, these appear as a thin layer of brittle compounds at the steel/scam interface. Their formation is related to temperature. It has been shown that, if the layer is less than 10 put thick, the joint is not compromised [Kreimeyer M., Sepold G. Laser steel joined aluminium-Hybrid structures, Proceedings of ICALEO'02, Jacksonville, USA; 2002]. Not only can temperature gradient be calculated by numerical simulation, but it is also possible to measure the surface temperature by thermography. We show here how thermography may be used to control temperature during laser braze welding. (c) 2005 Elsevier Ltd. All rights reserved.
  • 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.
  • Da Silva, A.; Sinfort, C.; Tinet, C.; Pierrat, D. & Huberson, S.
    | A Lagrangian model for spray behaviour within vine canopies
    | Journal of Aerosol Science, 2006 , 37 , 658-674 , DOI 10.1016/j.jaerosci.2005.05.016 | Engineering, Chemical; Environmental Sciences; Meteorology & Atmospheric Sciences | cited 6 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : EA1859 )
  • 2010.05.25
    Abstract:
    This work concerns the numerical prediction of pesticide deposits on vine by air assisted sprayers. This numerical model consists in two different parts: the air flow characteristics were obtained through a Navier-Stokes solver in which additional terms have been introduced in order to account for the modification of the flow by the vine foliage. The theoretical form of these terms was derived through an averaging procedure. As a result, the canopy effect was modelled by introducing momentum and turbulence source terms in the Navier-Stokes equations. The constants were identified thanks to experimental data obtained by direct measurements of the air flow speeds through an artificial canopy. The second part of the model consists in simulating the droplet cloud by means of a lagrangian stochastic model. The average motion of the droplets was computed through the use of lagrangian coordinates and the turbulence effect on the droplets was interpreted in term of statistical properties of the droplet cloud. The tractor displacements were accounted for through unsteady boundary conditions. Once the size and the droplets cloud locations have been determined, the deposit was predicted for a vine row of one meter length using an efficiency coefficient obtained from simulations. Thanks to this approach we were able to quantify the effect of air turbulence on droplet deposition. (C) 2005 Elsevier Ltd. All rights reserved.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Sadat, H.; Dubus, N.; Gbahoue, L. & Sophy, T.
    | On the solution of heterogeneous heat conduction problems by a diffuse approximation meshless method
    | Numerical Heat Transfer Part B-fundamentals, 2006 , 50 , 491-498 , DOI 10.1080/10407790600710184 | Thermodynamics; Mechanics | cited 5 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : EA1859 )
  • 2010.05.25
    Abstract:
    A diffuse approximation-based collocation method is used to solve a two-dimensional heterogeneous heat conduction problem. It is shown that one has to take into account the neighbors of each neighbor of the calculation node in order to achieve sufficient accuracy in the case of strong heterogeneity.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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:
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Han, A.; Pillon, G.; Nichici, A.; Vannes, B. & Grevey, D.
    | Study and evaluation of fretting critical slip conditions by applying the design of experiments method
    | Wear, 2006 , 261 , 1080-1086 , DOI 10.1016/j.wear.2006.02.006 | Engineering, Mechanical; Materials Science, Multidisciplinary | cited 2 times on 2010.05.25
    Reperage UB ( Perimetre(s) SMT / Code(s) unite(s) : EA2976 )
  • 2010.05.25
    Abstract:
    Tribological systems are complex systems that require a multi-disciplinary (mechanical, material, physico-chemical) approach where numerous influence factors can be involved. To characterize a contact couple, the intrinsic parameters of the materials as well as the parameters related to the contact loading and the surrounding environment need to be taken into account. Fretting analysis, by means of running condition-fretting maps (RUM), allows the behavior of the contact couple to be taken into account and to predict the boundary between partial slip and gross slip conditions. This article presents the study of a steel/polycarbonate couple during fretting tests. The study was carried out by performing a complete factorial experiment. This method has the advantages of reducing the number of experimental trails and of obtaining the internal laws of dependence, which highlight the influence of the significant factors of the fretting process on the tribological behavior of the studied contact couple. (c) 2006 Elsevier B.V. All rights reserved.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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).
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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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