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Affichage de 7211 à 7220 sur 16263

Article dans une revue

UWB cooperatif radar for localization and communication dedicated to guided transport

Tarik Tahri, Yassin El Hillali, Laila Sakkila, Atika Rivenq

Wireless technology for communication and localization in train applications are widely used. Ultra wide band appears as a very suitable technology for this kind of application, due to its large bandwidth, also to its good resistance to the interference and to multipath. In this paper, a new system…

International Journal of Intelligent Systems and Applications, 2014, 6, pp.27-33. ⟨10.5815/ijisa.2014.10.04⟩. ⟨hal-01056958⟩

Communication dans un congrès

Elastic field scattered by a resonator in an acoustic metamaterial

Bernard Bonello, Rémi Marchal, Rayisa P. Moiseyenko, Yan Pennec, Bahram Djafari-Rouhani, J. Zhao, Olga Boyko-Kazymyrenko

Locally resonant sonic materials are artificially structured composites designed to exhibit negative effective mass density and/or elastic constants at frequencies below the Bragg band gap, giving rise to one or several forbidden bands in a frequency range where the elastic wavelength is much…

European Materials Research Society Spring Meeting, E-MRS Spring 2014, Symposium D - Phonons and fluctuations in low dimensional structures, 2014, Lille, France. ⟨hal-00964114⟩

Communication dans un congrès

Hybrid organic-inorganic nanocomposites for terahertz applications

D. Hourlier-Bahloul, Srisaran Venkatachalam, Christophe Boyaval, Guillaume Ducournau, Y. Blum, Jean-Francois Lampin

The TeraHertz (THz) portion corresponds to the part of the electromagnetic spectrum having frequencies ranging from 0.3 to 10 THz. Unlike UV or X-rays, THz photons are not energetic enough to break chemical bonds or to ionize atoms or molecules. These radiations have found widespread applications…

European Materials Research Society Spring Meeting, E-MRS Spring 2014, Symposium I - Solution processing and properties of functional oxide thin films and nanostructures, 2014, Lille, France. ⟨hal-00964115⟩

Communication dans un congrès

PbS quantum dots and ZnO nanowires for 3rd generation solar cells

Basma El Zein, El Hadj Dogheche, Enrico Traversa

Semiconductor nanostructures with low dimensions such as quantum dots and nanowires are considered as important building blocks for the third generation solar cells, due to their useful optical and electrical properties. Quantum dots and nanowires hold promising potency to improve the performance…

European Materials Research Society Spring Meeting, E-MRS Spring 2014, Symposium Y - Advanced materials and characterization techniques for solar cells II, 2014, Lille, France. ⟨hal-00964524⟩

Article dans une revue

Mueller matrix optical and magneto-optical characterization of Bi-substituted gadolinium iron garnet for application in magnetoplasmonic structures

L. Halagacka, K. Postava, Mathias Vanwolleghem, Francois Vaurette, Jamal Ben Youssef, B. Dagens, J. Pistora

A ferromagnetic garnet, used as a magneto-optical (MO) material in magneto-photonic and magneto-plasmonic structures, is characterized. We present a general procedure to determine optical and magneto-optical functions of the magneto-optic garnet by using Mueller matrix ellipsometry. In the first…

Optical Materials Express, 2014, 4 (9), pp.1903-1919. ⟨10.1364/OME.4.001903⟩. ⟨hal-01058152⟩

Communication dans un congrès

Approach-to-equilibrium molecular dynamics for thermal conductivies and boundary conductances

Pier Luca Palla, Evelyne Lampin, Pierre-Arnaud Francioso, Fabrizio Cleri

Thermal transport is simulated at the atomic scale by approach-to-equilibrium molecular dynamics simulations (AEMD) [1]. In this method, a hot and a cold regions are delimited, before the approach-to-equilibrium is simulated by releasing the thermal constraint. The temperature difference between…

European Materials Research Society Spring Meeting, E-MRS Spring 2014, Symposium D - Phonons and fluctuations in low dimensional structures, 2014, Lille, France. ⟨hal-00966169⟩

Article dans une revue

Demonstrating kHz frequency actuation for conducting polymer microactuators

Ali Maziz, Cedric Plesse, Caroline Soyer, Claude Chevrot, Dominique Teyssié, Eric Cattan, Frederic Vidal

This paper reports results on ionic EAP micromuscles converting electrical into micromechanical response in open-air. Translation of small ion motion into large deformation in bending microactuator and its amplifi cation by fundamental resonant frequency are used as tools to demonstrate that small…

Advanced Functional Materials, 2014, 24, pp.4851-4859. ⟨10.1002/adfm.201400373⟩. ⟨hal-01058060⟩

Article dans une revue

On the effect of δ-doping in self-switching diodes

Andreas Westlund, Ignacio Iñiguez-De-La-Torre, Per-Åke Nilsson, Tomas González, Javier Mateos, Paul Sangaré, Guillaume Ducournau, Christophe Gaquière, L. Desplanque, Xavier Wallart, Jan Grahn

Lowering the carrier concentration is presented as a way to considerably improve the performance of self-switching diode (SSD) detectors. A physics-based theoretical model was used to derive an expression for the responsivity of SSDs as a function of carrier concentration, mobility, and design…

Applied Physics Letters, 2014, 105 (9), 093505, 5 p. ⟨10.1063/1.4894806⟩. ⟨hal-01061584⟩

Article dans une revue

Optimized V-shape design of GaN nanodiodes for the generation of Gunn oscillations

J.F. Millithaler, I. Iniguez-De-La-Torre, A. Iniguez-De-La-Torre, T. Gonz Alez, P. Sangaré, Guillaume Ducournau, Christophe Gaquière, J. Mateos

In this work, recent advances in the design of GaN planar Gunn diodes with asymmetric shape, socalled self-switching diodes, are presented. A particular geometry for the nanodiode is proposed, referred as V-shape, where the width of the channel is intentionally increased as approaching the anode.…

Applied Physics Letters, 2014, 104, 073509, 4 p. ⟨10.1063/1.4866166⟩. ⟨hal-00951554⟩

Communication dans un congrès

Synthesis and electrical characterisations of a low work function cesium oxide coating for high efficiency thermionic energy converter

François Morini, J.F. Robillard, Stéphane Monfray, I.D. Baikie, Thomas Skotnicki, Emmanuel Dubois

One main challenge associated with solid-state thermoelectric materials is to combine electron-crystal electrical conductivity and phonon-glass thermal properties that are difficult to conciliate. A markedly different principle of thermoelectric conversion is based on the micro-thermionic generator…

European Materials Research Society Spring Meeting, E-MRS Spring 2014, Symposium BB - Materials by design for energy applications through theory and experiment, 2014, Lille, France. ⟨hal-00966136⟩