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Affichage de 6751 à 6760 sur 16100

Article dans une revue

Optical waveguiding properties into porous gallium nitride structures investigated by prism coupling technique

Bandar Alshehri, Seung-Min Lee, Jin-Ho Kang, Su-Hyun Gong, Sang-Wan Ryu, Yong-Hoon Cho, El Hadj Dogheche

In order to modulate the refractive index and the birefringence of Gallium Nitride (GaN), we have developed a chemical etching method to perform porous structures. The aim of this research is to demonstrate that optical properties of GaN can be tuned by controlling the pores density. GaN films are...

Applied Physics Letters, 2014, 105, 051906, 4 p. ⟨10.1063/1.4892528⟩. ⟨hal-01056953⟩

Communication dans un congrès

A synthesis of theoretical and experimental study on power line communication over an aircraft tree-shaped network

Virginie Degardin, Pierre Laly, M. Lienard, Pierre Degauque

This paper gives an overview of the theoretical and experimental approach which has been carried out in order to study the feasibility of broadband power line communication in aircraft. The network which has been chosen corresponds to part of a cabin lighting system and whose tree shape...

2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS), Aug 2014, Beijing, China. E06 - EMC in Wired and Wireless Systems, paper E06.1, 4 p., ⟨10.1109/URSIGASS.2014.6929522⟩. ⟨hal-03514441⟩

Article dans une revue

Guided waves in multilayered plates

Jiangong Yu, Jean-Etienne Lefebvre, Lahoucine Elmaimouni

Conventional orthogonal polynomial approach can solve the multilayered plate only when the material properties of two adjacent layers do not change significantly. This paper developed an improved orthogonal polynomial approach to solve wave propagation in multilayered plates with very dissimilar...

Acta Mechanica Solida Sinica, 2014, 27 (5), pp. 542-550. ⟨hal-03644998⟩

Communication dans un congrès

Monte Carlo study of low and high-field electron transport in GaN-based heterostructures

Jean-Luc Thobel, François Dessenne, Christophe Dalle

Electron transport properties of GaN-based heterostructures are investigated by means of a Monte Carlo model, which considers a large number of subbands in several valleys. Room-temperature low-field mobility consistent with experimental results is obtained provided that screening of phonon...

17th International Workshop on Computational Electronics, IWCE 2014, 2014, Paris, France. paper D2, 4 p., ⟨10.1109/IWCE.2014.6865820⟩. ⟨hal-01005719⟩

Article dans une revue

On detection method for soft iterative decoding in the presence of impulsive interference

Vincent Dimanche, Alban Goupil, Laurent Clavier, Guillaume Gelle

This paper deals with the performance improvement of soft iterative decoders in impulsive interference modeled by additive noise. In case of $alpha$-stable noise, the inputs of the belief propagation decoder are too complex to compute. We propose to use an approximation of the log likelihood ratio...

IEEE Communications Letters, 2014, 18, pp.945-948. ⟨10.1109/LCOMM.2014.2320921⟩. ⟨hal-01005616⟩

Article dans une revue

Temperature dependence of dynamic hysteresis behavior in Pb0.4Sr0.6TiO3 ferroelectric films

Kui Li, Tao Li, Gang Du, Denis Remiens, Xianlin Dong, Genshui Wang

The temperature (T) dependence of dynamic hysteresis behavior is investigated in low temperature crystallized Pb0.4Sr0.6TiO3 thin films between 85 K and 340 K. It was found that the temperature scaling relations for hysteresis area 〈A〉, remnant polarization Pr and coercive field Ec take the...

Solid State Communications, 2014, 192, pp.89-92. ⟨10.1016/j.ssc.2014.05.007⟩. ⟨hal-01005622⟩

Article dans une revue

Geometrical optics-based model for dielectric constant and loss tangent free-space measurement

Kamel Haddadi, Tuami Lasri

A microwave free-space reflection method for determining the complex permittivity of planar dielectric materials is demonstrated. The method makes use of the measurement of the near-field microwave reflection coefficient of a metal-backed sample. The modeling of the structure and its calibration...

IEEE Transactions on Instrumentation and Measurement, 2014, 63, pp.1818-1823. ⟨10.1109/TIM.2013.2297811⟩. ⟨hal-01005621⟩

Communication dans un congrès

Key parameters of CVD-grown graphene on copper foil and its transfer for radio-frequency applications

Wei Wei, Geetanjali Deokar, Mohamed Moez Belhaj, D. Mele, Emiliano Pallecchi, Emmanuelle Pichonat, Dominique Vignaud, Henri Happy

To synthesize monolayer graphene and realize defect free transfer for electronic devices application are still challenges. In this letter, we present the fabrication and characterization of graphene field effect transistor (GFET), with respect to key parameters of graphene growth on Cu by chemical...

17èmes Journées Nationales du Réseau Doctoral en Micro-Nanoélectronique, JNRDM 2014, May 2014, Villeneuve d'Ascq, France. 4 p. ⟨hal-01018384⟩

Article dans une revue

Hypersonic band gap in an AlN-TiN bilayer phononic crystal slab

S. Hemon, Abdellatif Akjouj, A. Soltani, Yan Pennec, Y. El Hassouani, Abdelkrim Talbi, V. Mortet, Bahram Djafari-Rouhani

We show both theoretically and experimentally the existence of a complete band gap in a phononic crystal (PnC) constituted by periodical air holes drilled in a solid bi-layer slab. The composite slab is formed with an aluminum nitride (AlN) layer deposited on a titanium nitride (TiN) thin metallic...

Applied Physics Letters, 2014, 104, 063101, 5 p. ⟨10.1063/1.4864310⟩. ⟨hal-00947576⟩

Article dans une revue

Enhancement of thermoelectric power factor in NaxCoO2/Au multilayers

Xiaohui Zhao, Haifeng Wang, Shufang Wang, El Hadj Dogheche, Jianglong Wang, Guangsheng Fu

NaxCoO2/Au thin film multilayers, with a thickness of the Au layer of 0.5–12 nm, have been fabricated on c-Al2O3 by post annealing of the CoO/Au thin film multilayers in Na vapor at high temperature in air. X-ray diffraction measurements revealed that the resulting NaxCoO2 layer was c-axis oriented...

RSC Advances, 2014, 4 (100), pp.57148-57152. ⟨10.1039/C4RA07319C⟩. ⟨hal-03560771⟩