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Affichage de 6391 à 6400 sur 16094

  • Communication dans un congrès

Non-contact ultrasonic non-destructive techniques : state of the art and their use in civil engineering

Mariusz Kaczmarek, Bogdan Piwakowski, Radoslaw Drelich

Ultrasonic methods of testing of civil engineering materials in air where both transmission of waves into materials and reception of signals are contactless are reviewed. Short history, technical details and examples of applications of currently available methods are discussed. Keywords: ultrasound…

International Symposium on Non-Destructive Testing in Civil Engineering, NDT-CE 2015, Sep 2015, Berlin, Germany. 4 p. ⟨hal-04087510⟩

  • Article dans une revue

Plasticity in memristive devices for spiking neural networks

S. Saïghi, C.G. Mayr, T. Serrano-Gotarredona, H. Schmidt, G. Lecerf, J. Tomas, J. Grollier, S. Boyn, A.F. Vincent, D. Querlioz, S. La Barbera, F. Alibart, Dominique Vuillaume, O. Bichler, C. Gamrat, B. Linares-Barranco

Memristive devices present a new device technology allowing for the realization of compact non-volatile memories. Some of them are already in the process of industrialization. Additionally, they exhibit complex multilevel and plastic behaviors, which make them good candidates for the implementation…

Frontiers in Neuroscience, 2015, 9, pp.51. ⟨10.3389/fnins.2015.00051⟩. ⟨cea-01846866⟩

  • Article dans une revue

A model to predict modal radiation by finite-sized sources in composite plates with account of caustics

Mathilde Stévenin, Alain Lhémery, Sébastien Grondel

The guided wave field generated by finite size transducers in a composite plate is studied. For isotropic plates, Fraunhofer-like approximations can be found in the literature. Similar approximations fail when the plate is anisotropic. A new calculation method is proposed. Based on a modal…

Physics Procedia, 2015, 70, pp.622-625. ⟨10.1016/j.phpro.2015.08.042⟩. ⟨cea-01753218⟩

  • Article dans une revue

High density terahertz frequency comb produced by coherent synchrotron radiation

S Tammaro, Olivier Pirali, P Roy, Jean-Francois Lampin, Guillaume Ducournau, Arnaud Cuisset, Francis Hindle, Gaël Mouret

Frequency combs have enabled significant progress in frequency metrology and high-resolution spectroscopy extending the achievable resolution while increasing the signal-to-noise ratio. In its coherent mode, synchrotron radiation is accepted to provide an intense terahertz continuum covering a wide…

Nature Communications, 2015, 6 (1), pp.1-6 / Article n° 7733. ⟨10.1038/ncomms8733⟩. ⟨hal-04830388⟩

  • Article dans une revue

Wave propagation in functionally graded piezoelectric rods with rectangular cross-section

J.G. Yu, Zhang Bo, Jean-Etienne Lefebvre, C. Zhang

For the purpose of design and optimization of functionally graded piezoelectric material (FGPM) transducers, wave propagation in FGPM structures has received much attention in the past twenty years. But research focused essentially on semi-infinite structures and one-dimensional structures, i.e.,…

Archives of Mechanics, 2015, 67 (3), pp.213-231. ⟨hal-03560812⟩

  • Communication dans un congrès

Intelligent receiver for M-OAM IR-UWB modulations system

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

Wireless technology for communication, represents a permanent and evolutionary need in transport field, motivated by the improvement of the efficiency and safety of transports. The use of the ultra-wideband (UWB) technique can satisfy such a need. UWB ofTers numerous advantages such as: the large…

4th IEEE International Conference on Advanced Logistics and Transport, IEEE ICALT 2015, May 2015, Valenciennes, France. pp.111-115, ⟨10.1109/ICAdLT.2015.7136604⟩. ⟨hal-03528677⟩

  • Communication dans un congrès

Analysis of a Phononic Crystal Constituted of Piezoelectric Layers Using Electrical Impedance Measurement

S.A. Mansoura, Pierre Marechal, Bruno Morvan, Bertrand Dubus

Active materials are investigated as a tuning possibility for phononic crystals. Electromechanical properties of piezoelectric materials electrical and mechanical variables are coupled. Thus, the propagation properties of elastic waves can be tuned using electrical impedance load connected to the…

2015 ICU International Congress on Ultrasonics, Metz, France, May 2015, Metz, France. pp.283-286, ⟨10.1016/j.phpro.2015.08.155⟩. ⟨hal-03875669⟩

  • Article dans une revue

Cancellation Technique for CW Ground Penetrating Radar Applications

S. Nounouh, Kamel Haddadi, T. Lasri

An adjustable canceller based on microwave interferometry is proposed for ground penetrating radar applications. This canceller, built up with a power divider and an impedance tuner, is integrated in a monostatic continuous wave (CW) radar in order to improve its measurement sensitivity. A set of…

IEEE Microwave and Wireless Components Letters, 2015, 25 (5), pp.343-345. ⟨10.1109/LMWC.2015.2410144⟩. ⟨hal-03224664⟩

  • Communication dans un congrès

Forward V-band Vector Network Analyzer Based on a Modified Six-port Technique

Kamel Haddadi, Tuami Lasri

A V-band forward network analyzer based on a modified six-port technique is proposed for the measurement of complex reflection (S-11) and transmission (S-21) coefficients. The millimeter-wave part of the system is implemented on a thin alumina ceramic substrate. The measurement performance is…

2015 IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet 2015, 9th IEEE Radio & Wireless Week, RWW 2015, Jan 2015, San Diego, CA, États-Unis. pp.23-25, ⟨10.1109/WISNET.2015.7127400⟩. ⟨hal-03224666⟩

  • Communication dans un congrès

Dielectric Properties Extraction of Coplanar Propagation Waveguides on High Resistivity Silicon Substrates

Qing Lv, Hua Zhao, N. Defrance, Chao Fu, Kamel Haddadi, Lujuan Ma

The dielectric properties of coplanar propagation waveguides (CPW) designed and fabricated on high resistivity silicon substrates are investigated. These CPWs exhibited transmission losses around 0.4 dB/mm at 50 GHz. In particular, temperature-dependent measurements show very low deviations. The…

International Conference on Mechatronics, Electronic, Industrial and Control Engineering (MEIC), Apr 2015, Shenyang, PEOPLES R, China. pp.539-542. ⟨hal-03224668⟩