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Affichage de 351 à 360 sur 596

Article dans une revue

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⟩

Article dans une revue

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⟩

Article dans une revue

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⟩

Article dans une revue

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⟩

Article dans une revue

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⟩

Article dans une revue

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⟩

Article dans une revue

The Dirichlet problem for a prescribed anisotropic mean curvature equation

Chiara Corsato, Colette De Coster, Pierpaolo Omari

We discuss existence, uniqueness, regularity and boundary behaviour of solutions of the Dirichlet problem for the prescribed anisotropic mean curvature equation −div(∇u/1+|∇u|2)=−au+b/1+|∇u|2, where a,b>0 are given parameters and Ω is a bounded Lipschitz domain in RN. This equation appears in…

Journal of Differential Equations, 2016, 260 (5), pp.4572-4618. ⟨10.1016/j.jde.2015.11.024⟩. ⟨hal-03135815⟩

Article dans une revue

Development of flexible SAW sensors for non-destructive testing of structure

Rafatou Takpara, Marc Duquennoy, Christian Courtois, Maurice Gonon, Mohammadi Ouaftouh, Gregory Martic, Mohamed Rguiti, Frédéric Jenot, Laurent Seronveaux, Christine Pelegris

In order to accurately examine structures surfaces, it is interesting to use surface SAW (Surface Acoustic Wave). Such waves are well suited for example to detect early emerging cracks or to test the quality of a coating. In addition, when coatings are thin or when emergent cracks are precocious,…

AIP Conference Proceedings, 2016, 1706 (1), ⟨10.1063/1.4940521⟩. ⟨hal-03119947⟩

Article dans une revue

Curvature properties of some class of warped product manifolds

Ryszard Deszcz, Małgorzata Głogowska, Jan Jełowicki, Georges Zafindratafa

We prove that warped product manifolds with p-dimensional base, p=1,2, satisfy some pseudosymmetry type curvature conditions. These conditions are formed from the metric tensor g, the Riemann–Christoffel curvature tensor R, the Ricci tensor S and the Weyl conformal curvature C of the considered…

International Journal of Geometric Methods in Modern Physics, 2016, 13 (01), pp.1550135. ⟨10.1142/S0219887815501352⟩. ⟨hal-03148376⟩

Article dans une revue

Design of C2 algebraic-trigonometric pythagorean hodograph splines with shape parameters

Cindy González, Gudrun Albrecht, Marco Paluszny, Marianela Lentini

In this paper, we construct C2 Algebraic-Trigonometric Pythagorean Hodograph (ATPH) splines by solving a non-linear system of equations in complex variables. We compare these splines, which depend on several shape parameters, with their polynomial PH counterpart as well as with the well-known C2…

Computational & Applied Mathematics, 2016, 37 (2), pp.1472-1495. ⟨10.1007/s40314-016-0404-y⟩. ⟨hal-03164878⟩