Publications

• POSTER

Quadratic equivalences and BCH formula for 2-step nilpotent varieties

Thibault Defourneau

Matinée des Chercheurs 2016, May 2016, Valenciennes, France. ⟨hal-03149664⟩

• ART

Strain effects on an electrostrictive polymer composite for power harvesting: experiments and modeling

Adil Eddiai, Mounir Meddad, M’hammed Mazroui, Yahia Boughaleb, M. Idiri, R. Khanfer, Mohamed Rguiti

In the field of vibrational energy harvesting, the electromechanical conversion demonstrated the many advantages of using electrostrictive polymers. These materials present advantageous features such as high productivity and high flexibility. The aim of this work is to provide a solution for…

Polymers for Advanced Technologies, 2016, 27 (5), pp.677-684. ⟨10.1002/pat.3738⟩. ⟨hal-03149401⟩

• ART

Mineralogical and chemical characterization of DD3 kaolin from the east Algeria

Hamza Senoussi, Hocine Osmani, Christian Courtois, Mohamed El Hadi Bourahli

The mineralogical and chemical characteristics, based on X-ray diffraction (XRD) and scanning electron microscopy, of a kaolin known as DD3, from eastern Algeria were examined in the present study. The results showed that kaolin DD3 has an alumina content of 39%. The SiO2/Al2O3 molar ratio of 2.14…

Boletín de la Sociedad Española de Cerámica y Vidrio, 2016, 55 (3), pp.121-126. ⟨10.1016/j.bsecv.2015.12.001⟩. ⟨hal-03116798⟩

• ART

Elaboration and characterization of PMN–xPT solid ceramics used in a numerical simulation of a piezoelectric transducer for a loudspeaker application

Madiha Yessari, Houda Lifi, Abdelowahed Hajjaji, Mohamed Rguiti, Mohammed Benjelloun, Abdezzahid Arbaoui

Solid ceramics (1 − x)PbMg1/3Nb2/3O3–xPbTiO3 (PMN–xPT) have been prepared and characterized in the present work. Three PMN–xPT compositions were used with x taking the values of 0.31, 0.33 and 0.35. For the three compositions, an analysis of the dielectric behavior has been made, in order to…

Optical and Quantum Electronics, 2016, 48 (5), ⟨10.1007/s11082-016-0557-3⟩. ⟨hal-03120147⟩

• ART

Crystalline forms of PVDF fiber filled with clay components along processing steps

Matthieu Boudriaux, François Rault, Cédric Cochrane, Guillaume Lemort, Christine Campagne, Eric Devaux, Christian Courtois

There is a growing interest in the supply of autonomous electronic devices, particularly in the field of smart textiles. Energy harvesting is considered as a clean and renewable alternative technology to reach this objective. One of the methods explored is scavenging the energy from ambient…

Journal of Applied Polymer Science, 2016, 133 (14), ⟨10.1002/app.43244⟩. ⟨hal-03120620⟩

• ART

The BEM with graded meshes for the electric field integral equation on polyhedral surfaces

A. Bespalov, Serge Nicaise

We consider the variational formulation of the electric field integral equation on a Lipschitz polyhedral surface \(\Gamma \). We study the Galerkin boundary element discretisations based on the lowest-order Raviart–Thomas surface elements on a sequence of anisotropic meshes algebraically graded…

Numerische Mathematik, 2016, 132 (4), pp.631-655. ⟨10.1007/s00211-015-0736-3⟩. ⟨hal-03135588⟩

• ART

A priori error analysis of the BEM with graded meshes for the electric field integral equation on polyhedral surfaces

A. Bespalov, Serge Nicaise

The Galerkin boundary element discretisations of the electric field integral equation (EFIE) on Lipschitz polyhedral surfaces suffer slow convergence rates when the underlying surface meshes are quasi-uniform and shape-regular. This is due to singular behaviour of the solution to this problem in…

Computers & Mathematics with Applications, 2016, 71 (8), pp.1636-1644. ⟨10.1016/j.camwa.2016.03.013⟩. ⟨hal-03135595⟩

• THESE

Élaboration de céramiques polycristallines transparentes Er ³+ : YAG par Spark Plasma Sintering pour applications laser de puissance, Development of transparent polycrystalline Er ³+ : YAG ceramics by Spark Plasma Sintering for high power laser applications

Aurelien Katz

Cette étude s’intéresse à l’amélioration des performances du laser solide Er3+:YAG, dont la longueur d’onde de 1,64 µm est dite « eye-safe ». L’une des solutions est le remplacement des monocristaux actuellement utilisés comme milieu amplificateur par des céramiques polycristallines Er:YAG…, This work focus on the improvement of the solid state Er3+:YAG laser performances presenting an "eye-safe" wavelength at 1.64 µm. One way is the replacement of single crystals currently used as gain media by polycrystalline ceramics as they present improved thermo-mechanical properties…

Matériaux. Université de Valenciennes et du Hainaut-Cambresis, 2016. Français. ⟨NNT : 2016VALE0007⟩. ⟨tel-03224333⟩

• COMM

Développement de capteurs piezoélectriques interdigités flexibles pour la caractérisation ultrasonore des revêtements

Rafatou Takpara, Marc Duquennoy, Christian Courtois, Mohamed Rguiti

30èmes Journées Annuelles du Groupe Français de la Céramique, GFC 2016, Mar 2016, Valenciennes, France. ⟨hal-03591220⟩

• ART

Discretization of the Poisson equation with non-smooth data and emphasis on non-convex domains

Thomas Apel, Serge Nicaise, Johannes Pfefferer

Several approaches are discussed how to understand the solution of the Dirichlet problem for the Poisson equation when the Dirichlet data are non-smooth such as if they are in L2 only. For the method of transposition (sometimes called very weak formulation) three spaces for the test functions are…

Numerical Methods for Partial Differential Equations, 2016, 32 (5), pp.1433-1454. ⟨10.1002/num.22057⟩. ⟨hal-03138821⟩