Search

Your search keyword '"Vigneron, J. P."' showing total 350 results
Start Over Author "Vigneron, J. P."
350 results on '"Vigneron, J. P."'

1. Extended slow-light field enhancement in positive/negative-index heterostructures

Author

Foteinopoulou, S. and Vigneron, J. P.

Subjects
Physics - Optics, Condensed Matter - Materials Science
Abstract

We present a bi-waveguide paradigm composed of joined Positive-Index-Material PIM)/Negative-Index-Material (NIM) slabs, demonstrating ultra-slow light propagation stemming from the competing propagation disposition in the PIM and NIM regions. We report for the first time a mesoscopic extended electromagnetic (EM) enhancement covering regions of the order of the free space wavelength, enabled by the slow-light mode in our system. Our dynamic numerical results are consistent with our developed theoretical model, predicting an EM energy accumulation reminiscent of a charging capacitor. Our analysis reveals that spatial compression is not a requirement to EM enhancement in slow-light systems and stresses on the merits of high coupling efficiency, strong temporal compression, monomodality and modal index bandwidth, -all present in our proposed paradigm. Furthermore, we show that the heterostructure waveguide mode is an extra-ordinary entity with a unique energy velocity, that is opposite to the Poynting vector in one of the participant waveguides. We believe these results will inspire new slow-light platforms relevant to the collective harvesting of strong light-matter interactions., Comment: 28 pages, 10 figures

Published
2020
Full Text
View/download PDF

2. Laboratory analogues simulating Titan's atmospheric aerosols: Compared chemical compositions of grains and thin films

Author

Carrasco, N., Jomard, F., Vigneron, J., Etcheberry, A., and Cernogora, G.

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Two sorts of solid organic samples can be produced in laboratory experiments simulating Titan atmospheric reactivity: grains in the volume and thin films on the reactor walls. We expect that grains are more representative of Titan atmospheric aerosols, but films are used to provide optical indices for radiative models of Titan atmosphere. The aim of the present study is to address if these two sorts of analogues are chemically equivalent or not, when produced in the same N2-CH4 plasma discharge. The chemical compositions of both these materials are measured by using elemental analysis, XPS analysis and Secondary Ion Mass Spectrometry. The main parameter probed is the CH4 N2 ratio to explore various possible chemical regimes. We find that films are homogeneous but significantly less rich in nitrogen and hydrogen than grains produced in the same experimental conditions. This surprising difference in their chemical compositions could be explained by the efficient etching occurring on the films, which stay in the discharge during the whole plasma duration, whereas the grains are ejected after a few minutes. The higher nitrogen content in the grains possibly involves a higher optical absorption than the one measured on the films, with a possible impact on Titan radiative models.

Published
2017
Full Text
View/download PDF

22. Selective binding of a macrocyclic bisacridine to DNA hairpins

Author

Slama-Schwok, A., Teulade-Fichou, M.-P., Vigneron, J.-P., Taillandier, E., and Lehn, J.-M.

Subjects
DNA -- Research, Acridine -- Research, Binding sites (Biochemistry) -- Analysis, Chemistry
Abstract

The binding of a macrocyclic bisacridine (1) to the DNA hairpin d(GCGAAACGC) known as sA3, results in two complexes of 1/1 and 2/1 stoichiometries. The fluorescence data on sA3 and model oligomers explain the presence of the macrocyclic binding site in the hairpin loop. The macrocyclic structure of (1) is responsible for the selectivity towards the hairpin relative to the double helices and single stranded oligomers.

Published
1995

31. Physisorption in confined geometry.

Author

Derycke, I., Vigneron, J. P., Lambin, Ph., Lucas, A. A., and Derouane, E. G.

Subjects
*ABSORPTION, *GEOMETRY, *MOLECULES
Abstract

The physisorption of molecules in confined geometry, i.e., in pores of atomic size such as found in zeolites, has been investigated using a simple pairwise-additive Lennard-Jones potential and an effective-medium model. In a spherical geometry, it is found that the equilibrium distance D corresponding to the lowest equilibrium energy is reduced to about 90% of the pair equilibrium distance σe. This originates from the increased dominance of long-range forces in the condensed state. The enhancement of the physisorption energy due to surface curvature and confinement effects reaches its maximum value of 5.05, relative to the flat surface, when D=0.899σe. This value must be compared to the factor of 8 which was derived previously [D. H. Everett and P. C Powl, J. Chem. Soc. Faraday Trans. 1 72, 619 (1976); E. G. Derouane, J.-M. André, and A. A. Lucas, Chem. Phys. Lett. 137, 336 (1987)] using a simple van der Waals model neglecting repulsion forces. It is also concluded that molecules can be strongly trapped in pores which are substantially narrower than their free (gaseous phase) sizes, the situation of lowest energy corresponding to R=D=0.899σe and the sorption energy remaining negative down to R=D=0.749σe (R denotes the pore radius). [ABSTRACT FROM AUTHOR]

Published
1991
Full Text
View/download PDF

32. van der Waals interaction at a material wedge.

Author

Lambin, Ph., Lucas, A. A., Derycke, I., Vigneron, J.-P., and Derouane, E. G.

Subjects
VAN der Waals forces, ATOMS, PARTICLES
Abstract

The problem of evaluating the van der Waals attraction energy of an atom or microparticle adsorbed near the edge of a straight material wedge of arbitrary opening angle is considered. In order to disentangle more clearly the effect of the wedge geometry from the material parameters, a simple model is used in which the particle is represented by a harmonic oscillator and the substrate by a perfect conductor. By a straightforward extension of the method of images of classical electrostatics, the dipolar coupling of the particle to the substrate is constructed from which new oscillator frequencies can be determined as a function of its position relative to the edge and of the wedge angle. The van der Waals energy is given by the shift in zero-point energy of the oscillator coupled to itself via its images. For a physisorbed atom crossing the edge of a wedge material, the detailed shape of the van der Waals energy barrier (respectively, well) offered by a convex (respectively, concave) wedge is displayed and compared with approximate results deduced from a pairwise summation of Lennard-Jones interactions. The interest of these results for the dynamics and kinetics of sorption by microporous solids is briefly discussed. [ABSTRACT FROM AUTHOR]

Published
1989
Full Text
View/download PDF

33. Physicochemical stability of norepinephrine bitartrate in polypropylene syringes at high concentrations for intensive care units

Author

D’Huart, E., Vigneron, J., Clarot, I., and Demore, B.

Abstract

•In the literature, to the best of our knowledge, there is no stability data available on norepinephrine at high concentrations up to 1.16mg/mL.•This drug is usually used in intensive care units for the restoration of blood pressure.•These stability data of highly concentrated solutions provide additional knowledge to assist intensive care services in daily practice.

Published
2019
Full Text
View/download PDF

34. Non-destructive and Multi-modal 3D Imaging of Biological Materials

Author

Cloetens, P., Suhonen, H., Bay, A., Bohic, S., Fleck, C., Langer, M., Pacureanu, A., Peyrin, F., Rack, A., Vigneron J., P., Zaslansky, P., European Synchrotron Radiation Facility (ESRF), Université de Namur [Namur] (UNamur), Grenoble Institut des Neurosciences (GIN), Université Joseph Fourier - Grenoble 1 (UJF)-Institut National de la Santé et de la Recherche Médicale (INSERM), Technische Universität Berlin (TU), Imagerie Tomographique et Radiothérapie, Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé (CREATIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Hospices Civils de Lyon (HCL)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Hospices Civils de Lyon (HCL)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2012

35. 'Paromomycin and neomycin B derived cationic lipids: Synthesis and transfection studies', Journal of Controlled Release, 158, 461-469, 2012

Author

Mével, M., Sainlos, M., Chatin, B., Oudrhiri, N., Hauchekorne, M., Lambert, O., Vigneron, J.-P., Lehn, P., Pitard, B., Lehn, J.-M., Centre de recherche sur la Paléobiodiversité et les Paléoenvironnements (CR2P), Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), Institut de Science et d'ingénierie supramoléculaires (ISIS), and Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2012

36. Validation activities preparation for SMOS (Soil Moisture and Ocean Salinity) land products at the Valencia Anchor Station

Author

Lopez-Baeza, E., Acosta, R., Antolin, M. C., Balling, Jan E., Belda, F., Bouzinac, C., Cano, A., Delwart, S., Domenech, C., Ferreira, A., Juglea, S., Jerr, Y., Millan-Schelding, C., Narbon, C., Rodriguez, D., Saleh, K., Sanchis, J., Niels Skou, Sten Schmidl Søbjærg, Tauriainen, S., Velazques, A., Vidal, S., Vigneron, J. P., Wursteisen, P., Universitat de València (UV), Universidade de São Paulo (USP), Technical University of Denmark [Lyngby] (DTU), Spanish State Meteorological Agency (AEMET), European Space Agency (ESA), Fundaçao Cearense de Meteorologia e Recursos Hidricos, Centre d'études spatiales de la biosphère (CESBIO), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), University of Cambridge [UK] (CAM), TKK Helsinki University of Technology (TKK), Écologie fonctionnelle et physique de l'environnement (EPHYSE), Institut National de la Recherche Agronomique (INRA), Universidade de São Paulo = University of São Paulo (USP), Danmarks Tekniske Universitet = Technical University of Denmark (DTU), Agence Spatiale Européenne = European Space Agency (ESA), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), and Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)

Subjects
analyse de données, microonde passive, télédétection, [SDV]Life Sciences [q-bio], site atelier, MISSION SMOS, [SDE]Environmental Sciences, radiométrie, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2008

39. Démultiplexeur nanométriques à plasmons

Author

Beaugeois, M., Leonard Dobrzynski, Akjouj, A., Djafari-Rouhani, B., Jérôme Olivier Vasseur, Bouazaoui, M., Vilcot, J. P., Vigneron, J. P., Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université de Lille, Sciences et Technologies, Laboratoire de physique du solide (Namur) (LPS), and Facultés Universitaires Notre Dame de la Paix (FUNDP)

Subjects
[SPI]Engineering Sciences [physics]
Abstract

International audience

Published
2004

41. First international database of research teams in stability and compatibility of medications: An additional function in the Stabilis®database

Author

D’Huart, E., Vigneron, J., Gindre, I., Lider, P., and Demoré, B.

Abstract

•Currently, there is no database of research teams involved in stability studies.•This is the first database of research teams involved in stability studies.•This new function is a bridge between research teams and Stabilis®users.•Stabilis®users can suggest stability studies on the website.

Published
2018
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results