Publications

Affichage de 951 à 960 sur 1005

THESE

Stabilité de quelques problèmes d'évolution, Stability of some evolution problems

Julie Valein

Dans cette thèse nous étudions la stabilisation de quelques équations d'évolution par rétro-action (feedback). Tout d'abord, nous considérons la stabilisation de l'équation des ondes sur des réseaux 1-d par des feedbacks situés aux nœuds. Dans le premier chapitre, en supposant que le…, In this PhD thesis we study the stabilization of some evolution equations by feedback laws. First we consider the stabilization of the wave equation on 1-d networks with nodal feedbacks. In chapter 1, assuming that the weight of the feedback without delay is smaller than the one with delay, we give…

Mathématiques [math]. Université de Valenciennes et du Hainaut-Cambrésis, 2008. Français. ⟨NNT : 2008VALE0032⟩. ⟨tel-03012114⟩

THESE

Analyse et modèles dynamiques non commutatifs sur l'espace de q-Minkowski, Analysis and Noncommutative Dynamical Models on q-Minkowski Space Algebra

Antoine Dutriaux

Cette thèse se place dans le cadre du vaste domaine s'intitulant géométrie non commutative, domaine dont l'étude est motivée par l'opinion courante des mathématiciens et physiciens selon laquelle les méthodes de la géométrie non commutative peuvent être utiles pour décrire certains…, The present thesis deals with the large field of noncommutative geometry. This field is extensively studied because of mathematicians and physicists' common opinion that noncommutative geometry methods are useful tools to describe dynamical processes at Planck length. So the main purpose of…

Mathématiques [math]. Université de Valenciennes et du Hainaut-Cambresis, 2008. Français. ⟨NNT : ⟩. ⟨tel-00289899⟩

THESE

Le delta-barre pour certains feuilletages complexes, The Cauchy-Riemann problem for some complex foliations

Jihène Slimène

La cohomologie de Dolbeault feuilletée mesure l’obstruction à la résolution du problème du dbarre (ou delta-barre) le long des feuilles d’un feuilletage complexe. Dans ce travail, on étudie cette cohomologie en utilisant (le plus souvent) des méthodes de cohomologie de groupes discrets sur…, Leafwise Dolbeault cohomology measures the obstruction to solve the -problem along the leaves of a complex foliation. We compute this cohomology using essentially methods of cohomology of groups for some interesting examples : 1) a complex one dimensional linear foliation on the torus Tⁿ ; 2) a…

Mathématiques [math]. Université de Valenciennes et du Hainaut-Cambrésis; Université de Monastir, 2008. Français. ⟨NNT : 2008VALE0012⟩. ⟨tel-03009673⟩

THESE

Propriétés des hypersurfaces centroaffines et équaffines, Properties of centroaffine and equiaffine hypersurfaces

Lucius Ramifidisoa

Le sujet de cette thèse se situe dans le domaine de la géométrie différentielle affine. Dans ce domaine on étudie des hypersurfaces M de l'espace affine de dimension n+1. Cette étude fait partie du programme d'Erlangen de Félix Klein : « la géométrie est l'étude des propriétés qui…, The subject of this thesis is in the domain of differential geometry. In this field one studies hypersurfaces M of the (n+1)-dimension vector space. This study can be seen as part of the Erlangen program of Felix Klein: “geometry is the study of the properties which remain invariant under the…

Mathématiques [math]. Université de Valenciennes et du Hainaut-Cambrésis, 2008. Français. ⟨NNT : 2008VALE0008⟩. ⟨tel-03002278⟩

ART

A posteriori error estimations of a coupled mixed and standard Galerkin method for second order operators

Emmanuel Creusé, Serge Nicaise

In this paper, we consider a discretization method proposed by Wieners and Wohlmuth [26] (see also [16]) for second order operators, which is a coupling between a mixed method in a sub-domain and a standard Galerkin method in the remaining part of the domain. We perform an a posteriori error…

Journal of Computational and Applied Mathematics, 2008, 213 (1), pp.35-55. ⟨10.1016/j.cam.2006.12.027⟩. ⟨hal-00768642⟩

ART

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⟩

ART

Multivariate approximation : theory and applications. An overview

Carl De Boor, Christian Gout, Angela Kunoth, Christophe Rabut

The fourth conference on “Multivariate Approximation: Theory and Applications” was held April 26 to May 01, 2007 at Cancun, Mexico. This introductory paper describes the main topics in Approximation Theory presented during this conference, ranging from theoretical aspects to numerous applications.

Numerical Algorithms, 2008, 48 (1-3), pp.1-9. ⟨10.1007/s11075-008-9190-y⟩. ⟨hal-00634604⟩

ART

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⟩

ART

Generalized Fast Marching Method: Applications to Image Segmentation

Nicolas Forcadel, Carole Le Guyader, Christian Gout

In this paper, we propose a segmentation method based on the generalized fast marching method (GFMM) developed by Carlini et al. (submitted). The classical fast marching method (FMM) is a very efficient method for front evolution problems with normal velocity (see also Epstein and Gage, The curve…

Numerical Algorithms, 2008, 48 (1-3), pp.189-211. ⟨10.1007/s11075-008-9183-x⟩. ⟨hal-00372740⟩

ART

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⟩