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Affichage de 931 à 940 sur 1060

Article dans une revue

Stability of tetragonal 〈001〉 oriented PZN-12PT single crystals

S. Touhtouh, A. Hajjaji, Y. Boughaleb, K. Benkhouja, A. Arbaoui, Mohamed Rguiti, D. Guyomar

The present paper reports on the synthesis and electromechanical characterization of tetragonal (1 − x)Pb(Zn1/3–Nb2/3)O3–xPbTiO3 (x = 12) single crystals as a function of various external disturbances. Tetragonal PZN-12PT single crystals were grown using the flux method. The set of piezoelectric...

Optical Materials, 2012, 34 (10), pp.1625-1629. ⟨10.1016/j.optmat.2012.04.002⟩. ⟨hal-04281119⟩

Article dans une revue

Biomimetic evaluation of β tricalcium phosphate prepared by hot isostatic pressing

Mihaela Mateescu, Emmanuelle Rguitti, Arnaud Ponche, Michel Descamps, Karine Anselme

Two types of completely densified β-TCP tablets were synthesized from a stoichiometric β-TCP powder. The first ones (TCP) were conventionally sintered, while the second ones (TCP-T) were sintered and treated by hot isostatic process (HIP). The HIP produced completely densified materials with...

Biomatter, 2012, 2 (3), pp.103-113. ⟨10.4161/biom.21377⟩. ⟨hal-02584462⟩

Article dans une revue

Morphotropic phase boundary in the BNT–BT–BKT system

Jean-François Trelcat, Christian Courtois, Mohamed Rguiti, Anne Leriche, Paul-Henri Duvigneaud, Tiriana Segato

Lead-free x Bi0.5Na0.5TiO3–y BaTiO3–z Bi0.5K0.5TiO3 piezoelectric ceramics were synthesized by a conventional solid state reaction method. The microstructure, ferroelectric and piezoelectric properties of the ceramics were investigated. Structure measurements by X-ray diffraction with Rietveld...

Ceramics International, 2012, 38 (4), pp.2823-2827. ⟨10.1016/j.ceramint.2011.11.053⟩. ⟨hal-04281117⟩

Article dans une revue

Stabilization of non-homogeneous elastic materials with voids

Serge Nicaise, Julie Valein

We study the asymptotic behavior of the solution of the non-homogeneous elastic system with voids and a thermal effect. We first prove the well-posedness of this system under some realistic assumptions on the coefficients. Since this system suffers of exponential stability (as shown in dimension 1...

Journal of Mathematical Analysis and Applications, 2012, 387 (2), pp.1061-1087. ⟨10.1016/j.jmaa.2011.10.018⟩. ⟨hal-00644065⟩

Thèse

Elaboration et caractérisations de bioverres Si-Ca-Na-O et Si-Ca-Na-O-F dopés à l'azote, No title in english

Ahmed Bachar

L’étude de l’incorporation de l’azote dans des bioverres du système SiO2-Na2O-CaO, a été abordée selon une approche globale de la synthèse des bioverres oxynitrurés et oxyfluoronitrurés jusqu’à leurs caractérisations physico-chimiques, mécaniques et biologiques. Les protocoles de synthèse de ces..., This work presents the study of nitrogen addition in bioglasses of the system SiO2-Na2O-CaO. The purpose is to determine the effects of nitrogen addition on the physical and mechanical properties and the structure of oxynitride bioglasses based on the system Na2O-CaO-SiO2-Si3N4.In first time, the...

Matériaux. Université de Valenciennes et du Hainaut-Cambresis; Université Mohammed V-Agdal (Rabat, Maroc ; 1993-2014), 2012. Français. ⟨NNT : 2012VALE0008⟩. ⟨tel-00789198⟩

Ouvrages

Géométrie euclidienne élémentaire

Aziz El Kacimi Alaoui

Cet ouvrage est une introduction élémentaire à la géométrie affine euclidienne (essentiellement plane). Il est issu de cours professés par l'auteur aux étudiants de la Licence 3 et du Master enseignement. Sa lecture ne requiert que les notions de base de l'algèbre linéaire. Plusieurs...

Ellipses, pp.240, 2012, Références sciences, 978-2-7298-7194-9. ⟨hal-03234803⟩

Article dans une revue

Processing and dielectric properties of ZnTiO3 ceramics prepared from nanopowder synthesised by sol-gel technique

Ahcene Chaouchi, Malika Saidi, Sophie d'Astorg, Sylvain Marinel

ZnTiO3 nanopowders were obtained by sol-gel method. The nanopowders were characterised by means of TGA/DTA analysis, X-ray diffraction, TMA analysis and SEM characterisation. The results show that the crystalline structure of the sol-gel powders was obtained at 600°C, with crystallite sizes of 10...

Processing and Application of Ceramics, 2012, 6 (2), pp.83-89. ⟨10.2298/PAC1202083C⟩. ⟨hal-02450348⟩

Article dans une revue

Evidence of ferroelectricity in metastable Sm2Ti2O7 thin film

Zhenmian Shao, Sébastien Saitzek, Anthony Ferri, Mohamed Rguiti, Loïc Dupont, Pascal Roussel, Rachel Desfeux

The synthesis by the sol-gel route of metastable Sm 2Ti 2O 7 thin film is reported. While for standard conditions of pressure and temperature, the Sm 2Ti 2O 7 compound crystallizes in a cubic/pyrochlore structure, in the form of a thin film (grown on (110)-oriented SrTiO 3 substrate), a monoclinic/...

Journal of Materials Chemistry, 2012, 22 (19), pp.9806. ⟨10.1039/c2jm16261j⟩. ⟨hal-02269084⟩

Article dans une revue

Residual-based a posteriori estimators for the A/phi magnetodynamic harmonic formulation of the Maxwell system

Emmanuel Creusé, Serge Nicaise, Zuqi Tang, Yvonnick Le Menach, Nicolas Nemitz, Francis Piriou

This paper is devoted to the derivation of an a posteriori residual-based error estimator for the A/phi magnetodynamic harmonic formulation of the Maxwell system. The weak continuous and discrete formulations are established, and the well-posedness of both of them is addressed. Some useful...

Mathematical Models and Methods in Applied Sciences, 2012, 22 (5), pp.30. ⟨10.1142/S021820251150028X⟩. ⟨hal-00562073⟩

Communication dans un congrès

Low-voltage active diode rectifier for pyroelectric harvesting cell

Mounir Amokrane, Arnaud Baysse, Bertrand Nogarede, Mohamed Rguiti

This paper studies pyroelectric conversion using PLZT cell and diode rectifier. The objective of this work is to observe the possibility of a power supply via an active element. For this purpose, an active diode based rectifier for pyroelectric harvesting systems is presented, simulated and tested...

IECON 2012: 38th Annual Conference of the IEEE Industrial Electronics Society, Montréal, Canada, 2012, Montréal, Canada. ⟨10.1109/IECON.2012.6388574⟩. ⟨hal-04133999⟩