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Affichage de 561 à 570 sur 596

Article dans une revue

Weighted regularization for composite materials in electromagnetism

Patrick Ciarlet, François Lefèvre, Stéphanie Lohrengel, Serge Nicaise

In this paper, a weighted regularization method for the time-harmonic Maxwell equations with perfect conducting or impedance boundary condition in composite materials is presented. The computational domain Ω is the union of polygonal or polyhedral subdomains made of different materials. As a result…

ESAIM: Mathematical Modelling and Numerical Analysis, 2010, 44 (1), pp.75-108. ⟨10.1051/m2an/2009041⟩. ⟨hal-00873065⟩

Article dans une revue

Stabilization of second order evolution equations with unbounded feedback with time-dependent delay

Emilia Fridman, Serge Nicaise, Julie Valein

We consider abstract second order evolution equations with unbounded feedback with time-varying delay. Existence results are obtained under some realistic assumptions. We prove the exponential decay under some conditions by introducing an abstract Lyapunov functional. Our abstract framework is…

SIAM Journal on Control and Optimization, 2010, 48 (8), pp.5028-5052. ⟨10.1137/090762105⟩. ⟨hal-00599627⟩

Article dans une revue

Mechanism of Metal Oxide Nanoparticle Loading in SBA-15 by the Double Solvent Technique

Juliette van Der Meer, Isabelle Bardez-Giboire, Cyrille Albert-Mercier, Bertrand Revel, Anne Davidson, Renaud Denoyel

The interaction between SBA-15 mesoporous silica, alkane solvents, and water was studied to understand the mechanism of the so-called double solvent technique. This method facilitates the loading of the pores of SBA-15 with a metal oxide precursor soln., by prewetting the SBA-15 with an alkane. In…

Journal of Physical Chemistry C, 2010, 114 (8), pp.3507-3515. ⟨10.1021/jp907002y⟩. ⟨hal-00604812⟩

Article dans une revue

Vickers Indentation Fracture (VIF) modeling to analyze multi-cracking toughness of Titania, Alumina and Zirconia plasma sprayed coatings

Didier Chicot, G. Duarte, Arnaud Tricoteaux, Benoît Jorgowski, Anne Leriche, Jacky Lesage

For massive brittle materials, the fracture toughness in mode I, KIC, can be determined using various reliable techniques. Besides, Vickers Indentation Fracture (VIF) technique has been developed to locally determine fracture toughness. However, since the indentation test generates a complex three-…

Materials Science and Engineering: A, 2009, 527 (1-2), pp.65-76. ⟨10.1016/j.msea.2009.08.058⟩. ⟨hal-00429771⟩

Article dans une revue

STABILITY OF THE HEAT AND OF THE WAVE EQUATIONS WITH BOUNDARY TIME-VARYING DELAYS

Serge Nicaise, Julie Valein, Emilia Fridman

Exponential stability analysis via Lyapunov method is extended to the one-dimensional heat and wave equations with time-varying delay in the boundary conditions. The delay function is admitted to be time-varying with an a priori given upper bound on its derivative, which is less than 1. Sufficient…

Discrete and Continuous Dynamical Systems - Series S, 2009, 2 (3), pp.559-581. ⟨10.3934/dcdss.2009.2.559⟩. ⟨hal-03579866⟩

Article dans une revue

Dispositif expérimental d'analyse des performances de cellules photovoltaïques

Jean-Paul Becar, Fabrice Robert, Jean-Charles Canonne, Laurent Vermeiren

L'article rapporte un travail de conception, de réalisation et d'utilisation d'un dispositif expérimental d'analyse de performances de cellules photovoltaïques. Initié à son origine par des questionnements d'étudiants d'un Institut Universitaire de Technologie relatifs…

Journal sur l'enseignement des sciences et technologies de l'information et des systèmes, 2009, 8, pp.1009. ⟨10.1051/j3ea:2008050⟩. ⟨hal-02049289⟩

Article dans une revue

Stabilization of the Wave Equation on 1-d Networks

Julie Valein, Enrique Zuazua

In this paper we study the stabilization of the wave equation on general 1-d networks. For that, we transfer known observability results in the context of control problems of conservative systems (see [R. Dáger and E. Zuazua, Wave Propagation, Observation, and Control in 1-d Flexible Multi-…

SIAM Journal on Control and Optimization, 2009, 48 (4), pp.2771-2797. ⟨10.1137/080733590⟩. ⟨hal-03550152⟩

Article dans une revue

On the use of response surface methodology to predict and interpret the preferred c-axis orientation of sputtered AlN thin films

J. Adamczyk, Nicolas Horny, Arnaud Tricoteaux, Pierre-Yves Jouan, M. Zadam

This paper deals with experimental design applied to response surface methodology (RSM) in order to determine the influence of the discharge conditions on preferred c-axis orientation of sputtered AlN thin films. The thin films have been deposited by DC reactive magnetron sputtering on Si (1 0 0)…

Applied Surface Science, 2008, 254 (6), pp.1744-1750. ⟨10.1016/j.apsusc.2007.07.139⟩. ⟨hal-03455048⟩

Article dans une revue

Approximation of surfaces with fault(s) and/or rapidly varying data, using a segmentation process, $D^m$-splines and the finite element method

Christian Gout, Carole Le Guyader, Lucia Romani, Anne-Gaëlle Saint-Guirons

In many problems of geophysical interest, one has to deal with data that exhibit complex fault structures. This occurs, for instance, when describing the topography of seafloor surfaces, mountain ranges, volcanoes, islands, or the shape of geological entities, as well as when dealing with reservoir…

Numerical Algorithms, 2008, 48 (1-3), pp.67-92. ⟨10.1007/s11075-008-9177-8⟩. ⟨hal-00372730⟩

Article dans une revue

Geodesic Active Contour under Geometrical Conditions: theory and 3D applications

Carole Le Guyader, Christian Gout

In this paper, we propose a new scheme for both detection of boundaries and fitting of geometrical data based on a geometrical partial differential equation, which allows a rigorous mathematical analysis. The model is a geodesic-active-contour-based model, in which we are trying to determine a…

Numerical Algorithms, 2008, 48 (1-3), pp.105-133. ⟨10.1007/s11075-008-9174-y⟩. ⟨hal-00372706⟩