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Affichage de 6781 à 6790 sur 16551

Communication dans un congrès

Optimal Computation of Guided Wave Propagation and Scattering in Pipeworks Comprising Elbows: Numerical and Experimental Validations and Parametric Studies

M. El Bakkali, A. Lhemery, B. Chapuis, F. Berthelot, Sébastien Grondel

Simulation tools of guided wave (GW) examination are developed at CEA to help inspection design and results interpretation. In a previous paper [M. El Bakkali, A. Lhemery, V. Baronian and F. Berthelot, (AIP Conf. Proc. 1581), pp. 332-9 (2014)], a model was developed to deal with GW propagation in…

41st Annual Review of Progress in Quantitative Nondestructive Evaluation, Jul 2014, Boise, United States. pp.746-753, ⟨10.1063/1.4914676⟩. ⟨cea-01852429⟩

Communication dans un congrès

Spectrum sensing applied to IR-UWB system based on M-OAM

Lamyae Maatougui, H. Ouahmane, A. Hajjaji, Khadija Hamidoun, Atika Rivenq, Yassin El Hillali

Intelligent transport system (ITS) exploits new communication and information technologies to make existing infrastructures more effective and more reliable, it resets on functions associated with the intelligence. The use of the ultra-wideband (UWB) appears as a very suitable technology for this…

3rd IEEE World Conference on Complex Systems, WCCS 2015, Nov 2015, Marrakec, Morocco. pp.7483218, ⟨10.1109/ICoCS.2015.7483218⟩. ⟨hal-03528682⟩

Article dans une revue

A New Multi-user Ultra Wide Band System Based on Modified Gegenbauer Functions and M-OAM Modulation for Communication of Intelligent Transportation Systems

Khadija Hamidoun, Raja Elassali, Yassin El Hillali, Atika Rivenq, Khalid Elbaamrani, Fouzia Boukour

Ultra-wideband technology is based on the transmission of very short pulses with relatively low energy, which make it a promising option for short range wireless commu- nication system. In this paper, we propose to use this technology to establish a new multi- user technique dedicated to…

Wireless Personal Communications, 2015, 82 (4), p2115-2134. ⟨10.1007/s11277-015-2337-y⟩. ⟨hal-01214089⟩

Article dans une revue

On the use of tracking loops for low-complexity multi-path channel estimation in OFDM systems

Huaqiang Shu, Eric Pierre Simon, Laurent Ros

—This paper treats pilot aided multi-path channel estimation with tracking loops for OFDM systems under slow to moderate fading conditions. Recent works have presented theoretical results for the tuning of second-order and third-order tracking loops in the particular context of Jakes's Doppler…

Signal Processing, 2015, 117, pp.174-187. ⟨10.1016/j.sigpro.2015.05.012⟩. ⟨hal-01174265⟩

Communication dans un congrès

Optimization of a tunable piezoelectric resonator using phononic crystals with periodic electrical boundary conditions

Marie-Fraise Ponge, Bertrand Dubus, Christian Granger, Jerome O. Vasseur, Mai Pham Thi, Anne-Christine Hladky

Piezoelectric phononic crystals with periodic short-circuit conditions exhibit Bragg band gaps. They are used to design a Fabry-Perot cavity. The design of the device enables a modification of cavity length by a spatial shift of electrical boundary conditions. The resonator is thus tunable and a…

Proceedings of the 2015 ICU International Congress on Ultrasonics, May 2015, Metz, France. pp.258-261, ⟨10.1016/j.phpro.2015.08.149⟩. ⟨hal-03300135⟩

Article dans une revue

Hexamolybdenum Clusters Supported on Graphene Oxide: Visible-Light Induced Photocatalytic Reduction of Carbon Dioxide into Methanol

Pawan Kumar, Harshal P. Mungse, Stéphane Cordier, Rabah Boukherroub, Om P. Khatri, Suman L Jain

Hexamolybdenum (Mo6) cluster-based compounds namely Cs2Mo6Bri8Bra6 and (TBA)2Mo6Bri8Bra6 (TBA = tetrabutylammonium) were immobilized on graphene oxide (GO) nanosheets by taking advantage of the high lability of the apical bromide ions with oxygen-functionalities of GO nanosheets. The loading of Mo6…

Carbon, 2015, 94, pp.91-100. ⟨10.1016/j.carbon.2015.06.029⟩. ⟨hal-01166772⟩

Article dans une revue

Phonon-limited carrier mobility and resistivity from carbon nanotubes to graphene

Jing Li, Henrique Pereira Coutada Miranda, Yann-Michel Niquet, Luigi Genovese, Ivan Duchemin, Ludger Wirtz, Christophe Delerue

Under which conditions do the electrical transport properties of one-dimensional (1D) carbon nanotubes (CNTs) and 2D graphene become equivalent? We have performed atomistic calculations of the phonon-limited electrical mobility in graphene and in a wide range of CNTs of different types to address…

Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 92 (7), pp.075414. ⟨10.1103/PhysRevB.92.075414⟩. ⟨hal-01615207⟩

Article dans une revue

Développement de capteurs interdigités pour le contrôle de structures

Rafatou Takpara, Dame Fall, Marc Duquennoy, Mohammadi Ouaftouh, Christian Courtois, Mohamed Rguiti, M. Gonon, N. Maurye, Gregory Martic, Véronique Lardot, Laurent Seronveaux, J. Halleux, Christine Pelegris, Mohamed Guessasma

Ce travail porte sur la réalisation de capteurs interdigités (IDT) afin de caractériser la qualité des revêtements et les surfaces des structures. L’enjeu de cette étude est triple. Il s'agit premièrement de disposer de capteurs efficaces pour générer des ondes acoustiques de surface SAW (…

Lebanese Science Journal, 2015, 16 (Special), pp.69-80. ⟨hal-03116778⟩

Communication dans un congrès

Optimization of high frequency 45 degrees acoustic mirrors for lab on chip applications

Sizhe Li, Julien Carlier, Fabrice Lefebvre, Pierre Campistron, Dorothée Debavelaere-Callens, Georges Nassar, Bertrand Nongaillard

Ultra high frequency (similar to 1GHz) ultrasonic bulk acoustic waves (BAW) characterization has been already integrated in a lab-on-a-chip silicon platform. The acoustic wave guided in three dimensions (3D) was achieved via 45 degrees mirrors in a silicon wafer and applied for the characterization…

2015 ICU International Congress on Ultrasonics, May 2015, Metz, France. pp.918-922, ⟨10.1016/j.phpro.2015.08.190⟩. ⟨hal-03280234⟩

Article dans une revue

Responses of a free-living benthic marine nematode community to bioremediation of a PAH mixture

Hela Louati, O.B. Said, A. Soltani, Cristiana Cravo-Laureau, Robert Duran, Patricia Aissa, E. Mahmoudi, O. Pringault

The objectives of this study were (1) to assess the responses of benthic nematodes to a polycyclic aromatic hydrocarbon (PAH) contamination and (2) to test bioremediation techniques for their efficiency in PAH degradation and their effects on nematodes. Sediments with their natural nematofauna…

Environmental Science and Pollution Research, 2015, 22 (20), pp.15307-15318. ⟨10.1007/s11356-014-3343-4⟩. ⟨hal-01631844⟩