Publicaciones

Affichage de 6281 à 6290 sur 16058

ART

Ambiguity function and Cramer-Rao bounds for standard and new modified Costas signals

Nadjah Touati, Charles Tatkeu, Thierry Chonavel, Yassin El Hillali, Atika Rivenq

The Cramer-Rao bound (CRB) gives a lower variance bound that an estimator can achieve. Presented is a mathematical approach to estimate it for specific radar signals, namely Costas signals and their modified versions. The modified versions design consists in widening Costas frequency hops and...

Electronics Letters, 2015, 51 (19), pp.1497-1499. ⟨10.1049/el.2015.1092⟩. ⟨hal-01213613⟩

ART

The Geometrical Foundation of Federigo Enriques’ Gnoseology and Epistemology

Paolo Bussotti, Raffaele Pisano

Advances in Historical Studies, 2015, 04 (02), pp.118-145. ⟨10.4236/ahs.2015.42012⟩. ⟨hal-04507571⟩

COMM

Experimental characterisation of IEEE 802.15.4 channel running at 2.4 GHz inside buildings

Laïd Sadoudi, Ulrich Biaou, Michael Bocquet, Emmanuel Moulin, Atika Rivenq, Jamal Assaad

In order to reduce energy consumption in buildings, sensor networks can be deployed to manage and control equipment in buildings. The WSNs based on ZigBee/IEEE 802.15.4 in the 2.4 GHz ISM (Industry Science and Medical) band, supports low prices and long battery life with moderate rates, low...

3rd IEEE International Workshop on Measurements and Networking, M and N 2015, Oct 2015, Coimbra, Portugal. pp.42-47, ⟨10.1109/IWMN.2015.7322971⟩. ⟨hal-03528692⟩

ART

Sound generation by non-synchronously oscillating rotor blades in turbomachinery

Di Zhou, Xiaoyu Wang, Jun Chen, Xiaodong Jing, Xiaofeng Sun

In this paper, the sound generation by non synchronously oscillating rotor blades in axial compressor is investigated with emphasis on establishing an analytical model for the corresponding sound field inside an annular duct. In terms of the present model, it is found that the acoustic frequency...

Journal of Sound and Vibration, 2015, 355, pp.150-171. ⟨10.1016/j.jsv.2015.06.018⟩. ⟨hal-01348664⟩

COMM

Estimation of the area of a reverberant plate using average reverberation properties

Hossep Achdjian, Emmanuel Moulin, Farouk Benmeddour, Jamal Assaad

This paper aims to present an original method for the estimation of the area of thin plates of arbitrary geometrical shapes. This method relies on the acquisition and ensemble processing of reverberated elastic signals on few sensors. The acoustical Green's function in a reverberant solid...

International Congress on Ultrasonics, ICU 2015, May 2015, Metz, France. pp.139-142, ⟨10.1016/j.phpro.2015.08.065⟩. ⟨hal-04087466⟩

ART

Tonpilz Underwater Acoustic Transducer Integrating Lead-free Piezoelectric Material

Rémi Rouffaud, Christian Granger, Anne-Christine Hladky, Mai Pham Thi, Franck Levassort

A Tonpilz transducer based on lead-free piezoelectric material was fabricated, modeled and characterized. The stack is composed of two rings of doped BaTiO 3. This composition was initially chosen due to good electromechanical performance (k t at 40%) and high mechanical quality factor (Q m over...

Physics Procedia, 2015, 70, pp.997 - 1001. ⟨10.1016/j.phpro.2015.08.208⟩. ⟨hal-01705141⟩

ART

Modelling based on Spatial Impulse Response Model for Optimization of Inter Digital Transducers (SAW Sensors) for Non Destructive Testing

Dame Fall, Marc Duquennoy, Mohammadi Ouaftouh, Bogdan Piwakowski, Frédéric Jenot

This study deals with modelling SAW-IDT transducers for their optimization. These sensors are specifically developed to characterize properties of thin layers, coatings and functional surfaces. Among the methods of characterization, the ultrasonic methods using Rayleigh surface waves are...

Physics Procedia, 2015, Proceedings of the 2015 ICU International Congress on Ultrasonics, Metz, France, 70, pp.927-931. ⟨10.1016/j.phpro.2015.08.192⟩. ⟨hal-03810639⟩