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Affichage de 6251 à 6260 sur 16064

Article dans une revue

Ultrasonic reflectometry in air: errors of sample positioning

Mariusz Kaczmarek, Bogdan Piwakowski, Radoslaw Drelich

The reflection coefficient of ultrasonic waves propagating in air and interacting with a plane surface of a solid is considered. The simulation of dependence of the reflection coefficient on errors of sample positioning is performed using a finite beam model along with an angular spectrum method,…

Journal of the Acoustical Society of America, 2015, 137 (1), pp.261-272. ⟨10.1121/1.4904533⟩. ⟨hal-03639070⟩

Article dans une revue

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…

Physics Procedia, 2015, 70, pp.258-261. ⟨10.1016/j.phpro.2015.08.149⟩. ⟨hal-03300497⟩

Article dans une revue

Ultrasonic Tomography of Nonmixing Fluid Flows

P I Pyl 'Nov, P I Krutyansky, V I Kutlubaeva, Farzam Zoueshtiagh, P I Chainais, V I Herman, Philippe Pernod

An ultrasonic method for simultaneous measurement of two-dimensional distributions of compositions and flow velocities in a system of two nonmixing fluids is proposed and implemented. The method is based on tomographic reconstruction of images of scalar and vector objects using a rectangular system…

Physics of Wave Phenomena, 2015, 23, pp.273 - 278. ⟨10.3103/S1541308X15040056⟩. ⟨hal-01433710⟩

Communication dans un congrès

Minimum spanning tree topology in real zigbee-arduino sensor network

M. Ouadou, O. Zytoune, Yassin El Hillali, Atika Rivenq, D. Aboutajdine

In this paper, we present a real indoor application for improved”Cluster Tree” network using Zigbee sensor nodes integrated with”Arduino” microcontrollers where the main goal is to study the efficiency of our improved clustering topology based on Minimum Spanning Tree (MST) construction under real…

7th International Conference on Ad Hoc Networks, AdHocHets 2015, Sep 2015, San Remo, Italy. pp.57-68, ⟨10.1007/978-3-319-25067-0_5⟩. ⟨hal-03528680⟩

Communication dans un congrès

Modeling of ZigBee (IEEE 802.15.4) channel in rail environment for Intelligent Transport

Ulrich Biaou, Laïd Sadoudi, Michael Bocquet, Atika Rivenq

To deploy Wireless Sensor Networks (WSNs) in the railway transport, knowledge of signal propagation in this environment is required for the safety and the reliability of whole system. This calls to two domains of research. Firstly, the study of the propagation characteristics is necessary to…

4th IEEE International Conference on Advanced Logistics and Transport, IEEE ICALT 2015, May 2015, Valenciennes, France. pp.293-298, ⟨10.1109/ICAdLT.2015.7136637⟩. ⟨hal-03528689⟩

Communication dans un congrès

Semi-digital FIR DAC for low power single carrier IEEE 802.11ad 60GHz transmitter

Fikre Tsigabu Gebreyohannes, Antoine Frappé, Andreas Kaiser

IEEE 802.11ad (WiGig) is an emerging multi-Gb/s wireless standard in the unlicensed 60GHz spectrum. This work presents system level validation of a Single Carrier (SC), QPSK modulated WiGig transmitter based on a semi-digital Finite Impulse Response (FIR) Digital-to-Analog Converter (DAC). The 1.…

2015 IEEE 13th International New Circuits and Systems Conference (NEWCAS), Jun 2015, Grenoble, France. pp.1-4, ⟨10.1109/NEWCAS.2015.7182016⟩. ⟨hal-03377047⟩

Article dans une revue

Kinetic proofreading of chromatin remodeling: from gene activation to gene repression and back

Raghvendra Singh, Guillaume Brysbaert, Marc Lensink, Fabrizio Cleri, Ralf Blossey

ATP-dependent chromatin remodeling is the active displacement of nucleosomes along or off DNA induced by chromatin remodeling complexes. This key process of gene regulation in eukaryote organisms has recently been argued to be controlled by a kinetic proofreading mechanism. In this paper we present…

AIMS Biophysics, 2015, 2 (4), pp.398-411. ⟨10.3934/biophy.2015.4.398⟩. ⟨hal-03285276⟩

Communication dans un congrès

Experimental Study of Multilayer Piezo-magnetic SAW Delay Line for Magnetic Sensor

Meriem Elhosni, Sébastien Petit-Watelot, Michel Hehn, Sami Hage-Ali, Keltouma Ait Aissa, Daniel Lacour, Abdelkrim Talbi, Omar Elmazria

<div><p>This communication describes an experimental study of multilayer piezo-magnetic acoustic wave devices used as sensors of external magnetic fields applied in plane, parallel or perpendicular to the direction of the acoustic wave propagation direction. The considered device…

Eurosensors 2015, Sep 2025, Freiburg (Allemagne), France. pp.870 - 873, ⟨10.1016/j.proeng.2015.08.743⟩. ⟨hal-05415947⟩

Communication dans un congrès

When capacitive transduction meets the thermomechanical limit: Towards femto-newton force sensors at very high frequency

S. Houmadi, Bernard Legrand, J.P. Salvetat, B. Walter, E. Mairiaux, J.P. Aime, D. Ducatteau, P. Merzeau, L. Buisson, J. Elezgaray, Didier Theron, Marc Faucher

We show that the capacitive transduction of a MEMS device using a setup based on a microwave detection scheme achieves the measurement of the thermomechanical noise spectrum of a high-frequency (>10 MHz) high-stiffness (>10 5 N/m) resonator, reaching the outstanding displacement resolution of…

28th IEEE Conference on Micro Electro Mechanical Systems, MEMS 2015, Jan 2015, Estoril, Portugal. ⟨10.1109/MEMSYS.2015.7050908⟩. ⟨hal-01962374⟩

Article dans une revue

Theoretical and experimental analyses of tunable Fabry-Perot resonators using piezoelectric phononic crystals

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

Theoretical and experimental analyses of piezoelectric stacks submitted to periodical electrical boundary conditions via electrodes are conducted. The presented structures exhibit Bragg band gaps that can be switched on or off by setting electrodes in short or open circuit. The band gap frequency…

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2015, 62 (6), pp.1114-1121. ⟨10.1109/TUFFC.2014.006919⟩. ⟨hal-03300133⟩