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Affichage de 921 à 930 sur 977

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

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

Study of the regenerator constituting material influence on a gamma type Stirling engine

Ramla Gheith, Fethi Aloui, Sassi Ben Nasrallah

A gamma Stirling engine with compressed air as working fluid was investigated. This engine operates at a maximum charge pressure of 10 bar, runs at a maximum rotation speed of 600 rpm and can provide 500 W of brake power on the shaft. The engine is equipped with several pressure sensors and...

Journal of Mechanical Science and Technology, 2012, 26 (4), pp.1251-1255. ⟨10.1007/s12206-012-0218-9⟩. ⟨hal-04165553⟩

Article dans une revue

Hybrid approaches for the two-scenario max-min knapsack problem

Saïd Hanafi, Raïd Mansi, Christophe Wilbaut, Arnaud Fréville

In this paper, we deal with the two-scenario max-min knapsack (MNK) problem. First, we consider several formulations of MNK as a mixed integer programming problem. Then, we propose a hybrid method as an alternative to solve the MNK exactly. The approach combines relaxation technique and the...

International Transactions in Operational Research, 2012, 19, pp.353 - 378. ⟨10.1111/j.1475-3995.2011.00836.x⟩. ⟨hal-03723733⟩

Article dans une revue

Iterative semi-continuous relaxation heuristics for the multiple-choice multidimensional knapsack problem

Igor Crevits, Saïd Hanafi, Raïd Mansi, Christophe Wilbaut

Recently several hybrid methods combining exact algorithms and heuristics have been proposed for solving hard combinatorial optimization problems. In this paper, we propose new iterative relaxation-based heuristics for the 0-1 Mixed Integer Programming problem (0-1 MIP), which generate a sequence...

Computers and Operations Research, 2012, 39, pp.32 - 41. ⟨10.1016/j.cor.2010.12.016⟩. ⟨hal-03723740⟩

Article dans une revue

On solar absorption refrigerator's performances

Emna Berrich, Ali Fellah, Fethi Aloui, Michel Feidt

Solar absorption refrigerator's performances are analysed by a conceptual optimization. The simulation is based on hierarchical decomposition, on the principles of the endoreversibility, respectively of the exoreversibility of the solar absorption refrigerators. Optimization is carried out by...

Ecological Engineering and Environment Protection, 2012, 2, pp.20-26. ⟨hal-04165632⟩

Thèse

Variétés de Richardson : multiplicités et désingularisation, Richardson varieties: multiplicities and desingularization

Michaël Balan

Une variété de Richardson est l'intersection d'une variété de Schubert directe avec une variété de Schubert opposée dans une variété de drapeaux. Dans cette thèse, on s'intéresse aux singularités des variétés de Richardson. Un résultat de Kreiman et Lakshmibai donne la multiplicité d..., A Richardson variety is the intersection of a direct Schubert variety with an opposite Schubert variety inside a fiag variety. ln this thesis, we are interested in the singularities of Richardson varieties. A result of Kreiman and Lakshmibai gives the multiplicity at a T-fixed point on a Richardson...

Mathématiques [math]. Université de Valenciennes et du Hainaut-Cambrésis, 2011. Français. ⟨NNT : 2011VALE0027⟩. ⟨tel-03416030⟩

Article dans une revue

Influence of hydrothermal synthesis conditions on BNT-based piezoceramics

Jean-François Trelcat, Sophie d'Astorg, Philippe Champagne, Christian Courtois, Mohamed Rguiti, Anne Leriche

The Bi0.5Na0.5TiO3 perovskite (BNT) is a very promising lead-free candidate for piezoelectric applications. Nevertheless a low reproducibility is commonly reported for the solid state synthesized BNT. In this work, the hydrothermal synthesis was investigated to improve the BNT ceramics...

Journal of the European Ceramic Society, 2011, 31 (11), pp.1997-2004. ⟨10.1016/j.jeurceramsoc.2011.04.025⟩. ⟨hal-04283000⟩

Article dans une revue

Microstructure and Nanoscale Piezoelectric/Ferroelectric Properties in La 2 Ti 2 O 7 Thin Films Grown on (110)‐Oriented Doped Nb:SrTiO 3 Substrates

Zhenmian Shao, Sébastien Saitzek, Pascal Roussel, Anthony Ferri, Émilie Bruyer, Adlane Sayede, Mohamed Rguiti, Olivier Mentré, Rachel Desfeux

(00l)‐Oriented La 2 Ti 2 O 7 (LTO) thin films with monoclinic perovskite‐layer structure [a = 7.806(2) Å, b = 5.552(3) Å, c = 13.015(5) Å, β = 98.62(2)°] have been grown by a sol–gel route on conducting (110)‐oriented doped Nb:SrTiO 3 (STO) substrates. The narrow rocking curves (0.24° width for 004...

Advanced Engineering Materials, 2011, 13 (10), pp.961-969. ⟨10.1002/adem.201100105⟩. ⟨hal-04282981⟩

Communication dans un congrès

Evaluation of an interactive table with tangible objects: Application with children in a classroom

Sébastien Kubicki, Sophie Lepreux, Christophe Kolski

After having introduced interactive tables as educational tools in schools, we present the TangiSense interactive table, which we use as the support for our research. We propose to evaluate the TangiSense table together with an application, Recognition and learning of colors, directly in a nursery...

Proceedings 2nd Workshop on Child Computer Interaction "UI Technologies and Educational Pedagogy", at CHI'2011, May 2011, Vancouver, Canada. ⟨hal-03428859⟩