Дисертації з теми "Valeurs propres de Neumann"
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Michetti, Marco. "Steklov and Neumann eigenvalues : inequalities, asymptotic and mixed problems." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0109.
This thesis is devoted to the study of Neumann eigenvalues, Steklov eigenvalues and relations between them. The initial motivation of this thesis was to prove that, in the plane, the product between the perimeter and the first Steklov eigenvalue is always less then the product between the area and the first Neumann eigenvalue. Motivated by finding counterexamples to this inequality, in the first part of this thesis, we give a complete description of the asymptotic behavior of the Steklov eigenvalues in a dumbbell domain consisting of two Lipschitz sets connected by a thin tube with vanishing width. Using these results in the two dimensional case we find that the inequality is not always true. We study the inequality in the convex setting, proving a weaker form of the inequality for all convex domains and proving the inequality for a special class of convex polygons. We then also give the asymptotic behavior for Neumann and Steklov eigenvalues on collapsing convex domains, linking in this way these two eigenvalues with Sturm-Liouville type eigenvalues. In the second part of this thesis, using the results concerning the asymptotic behavior of Neumann eigenvalues on collapsing domains and a fine analysis of Sturm-Liouville eigenfunctions we study the maximization problem of Neumann eigenvalues under diameter constraint. In the last part of the thesis we study the mixed Steklov-Dirichlet. After a first discussion about the regularity properties of the Steklov-Dirichlet eigenfunctions we obtain a stability result for the eigenvalues. We study the optimization problem under a measure constraint on the set in which we impose Steklov boundary conditions, we prove the existence of a minimizer and the non-existence of a maximizer. In the plane we prove a continuity result for the eigenvalues under some topological constraint
Shouman, Abdolhakim. "Comparaison de valeurs propres de Laplaciens et inégalités de Sobolev sur des variétés riemanniennes à densité." Thesis, Tours, 2017. http://www.theses.fr/2017TOUR4034.
The purpose of this thesis is threefold: SOBOLEV INEQUALITIES WITH EXPLICIT CONSTANTS ON A WEIGHTED RIEMANNIAN MANIFOLD OF CONVEX BOUNDARY: We obtain weighted Sobolev inequalities with explicit geometric constants for weighted Riemannian manifolds of positive m-Bakry-Emery Ricci curvature and convex boundary. As a first application, we generalize several results of Riemannian manifolds to the weighted setting. Another application is a new isolation result for the f -harmonic maps. We also give a new and elemantry proof of the well-known Moser-Trudinger-Onofri [Onofri, 1982] inequality for the Euclidean disk
Shouman, Abdolhakim. "Comparaison de valeurs propres de Laplaciens et inégalités de Sobolev sur des variétés riemanniennes à densité." Electronic Thesis or Diss., Tours, 2017. http://www.theses.fr/2017TOUR4034.
The purpose of this thesis is threefold: SOBOLEV INEQUALITIES WITH EXPLICIT CONSTANTS ON A WEIGHTED RIEMANNIAN MANIFOLD OF CONVEX BOUNDARY: We obtain weighted Sobolev inequalities with explicit geometric constants for weighted Riemannian manifolds of positive m-Bakry-Emery Ricci curvature and convex boundary. As a first application, we generalize several results of Riemannian manifolds to the weighted setting. Another application is a new isolation result for the f -harmonic maps. We also give a new and elemantry proof of the well-known Moser-Trudinger-Onofri [Onofri, 1982] inequality for the Euclidean disk
Berger, Amandine. "Optimisation du spectre du Laplacien avec conditions de Dirichlet et Neumann dans R² et R³." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAM036/document.
The optimization of Laplacian eigenvalues is a classical problem. In fact, at the end of the nineteenth century, Lord Rayleigh conjectured that the first eigenvalue with Dirichlet boundary condition is minimized by a disk. This problem received a lot of attention since this first study and research possibilities are numerous: various conditions, geometrical constraints added, existence, description of optimal shapes... In this document we restrict us to Dirichlet and Neumann boundary conditions in R^2 and R^3. We begin with a state of the art. Then we focus our study on disks and balls. Indeed, these are some of the only shapes for which it is possible to explicitly and relatively easily compute the eigenvalues. But we show in one of the main result of this document that they are not minimizers for most eigenvalues. Finally we take an interest in the possible numerical experiments. Since we can do very few theoretical computations, it is interesting to get numerical candidates. Then we can deduce some theoretical working assumptions. With this in mind we give some keys to understand our numerical method and we also give some results obtained
Chemlal, Rezki. "Valeurs propres des automates cellulaires." Phd thesis, Université Paris-Est, 2012. http://tel.archives-ouvertes.fr/tel-00794398.
Aboud, Fatima. "Problèmes aux valeurs propres non-linéaires." Phd thesis, Université de Nantes, 2009. http://tel.archives-ouvertes.fr/tel-00410455.
L(z)=H_0+z H_1+...+ zm-1Hm-1+zm , où H0,H1,...,Hm-1 sont des opérateurs définis sur l'espace de Hilbert H et z est un paramètre complexe. On s'intéresse au spectre de la famille L(z). Le problème L(z)u(x)=0 est un problème aux valeurs propres non-linéaires lorsque m≥2 (Un nombre complexe z est appelé valeur propre de L(z), s'il existe u dans H, u≠0$ tel que L(z)u=0). Ici nous considérons des familles quadratiques (m=2) et nous nous intéressons en particulier au cas LP(z)=-∆x+(P(x)-z)2, définie dans l'espace de Hilbert L2(Rn), où P est un polynôme positif elliptique de degré M≥2. Dans cet exemple les résultats connus d'existence de valeurs propres concernent les cas $n=1$ et $n$ paire.
L'objectif principal de ce travail est de progresser vers la preuve de la conjecture suivante, formulée par Helffer-Robert-Wang : « Pour toute dimension n, pour tout M≥2, le spectre de LP est non vide. »
Nous prouvons cette conjecture dans les cas suivants : (1) n=1,3, pour tout polynôme P de degré M≥2. (2) n=5, pour tout polynôme P convexe vérifiant de plus des conditions techniques. (3) n=7, pour tout polynôme P convexe.
Ce résultat s'étend à des polynômes quasi-homogènes et quasi-elliptiques comme par exemple P(x,y)=x2+y4, x dans Rn1, y dans Rn2, n1+n2=n, et n paire.
Nous prouvons ces résultats en calculant les coefficients d'une formule de trace semi-classique et en utilisant le théorème de Lidskii.
Aboud, Fatima Mohamad. "Problèmes aux valeurs propres non-linéaires." Nantes, 2009. http://www.theses.fr/2009NANT2067.
In this work we study the polynomial family of operators L(¸) = H0+¸H1+· · ·+¸m−1Hm−1+¸m, where the coefficients H0,H1, · · · ,Hm−1 are operators dened on the Hilbert space H and ¸ is a complex parameter. We are interested to study the spectrum of the family L(¸). The problem L(¸)u(x) = 0, is called a non-linear eigenvalue problem for m ¸ 2 (The number ¸0 2 C is called an eigenvalue of L(¸), if there exists u0 2 H, u0 6= 0 such that L(¸0)u0 = 0). We consider here a quadratic family (m = 2) and in particular we are interested in the case LP (¸) = −¢x + (P(x) − ¸)2, which is dened on the Hilbert space L2(Rn), where P is an elliptic positive polynomial of degree M ¸ 2. For this example results for existence of eigenvalues are known for n = 1 and n is even. The main goal of our work is to check the following conjecture, stated by Heler-Robert-Wang : For every dimension n, for every M ¸ 2, the spectrum of LP is non empty. We prouve this conjecture for the following cases : • n = 1, 3, for every polynomial P of degree M ¸ 2. • n = 5, for every convex polynomial P satisfying some technical conditions. • n = 7, for every convex polynomial P. This result extends to the case of quasi-homogeneous polynomial and quasi-elliptic, for example P(x, y) = x2 + y4, x 2 Rn1 , y 2 Rn2 , n1 + n2 = n, and n is even. We prove this results by computing the coefficients of a semi-classical trace formula and by using the theorem of Lidskii
Zielinski, Lech. "Valeurs propres d'opérateurs différentiels à coefficients irréguliers." Paris 7, 1990. http://www.theses.fr/1990PA077171.
Coste, Simon. "Grandes valeurs propres de graphes aléatoires dilués." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30122.
A random n x n matrix is diluted when the number of non-zero entries is of order n; adjacency matrices of d-regular graphs or adjacency matrices of Erdös-Rényi graphs with fixed average degree d are diluted. This dissertation is about the spectrum of diluted random matrices. In the first chapter I show an upper bound on the second eigenvalue of the transition matrix on a diluted directed graph model, the directed configuration model, in which the degree (in and out) of each vertex is specified. We also get an important generalization of Friedman's theorem: the second eigenvalue of the adjacency matrix of a directed d-regular graph is less than square root of d+o(1). A second short chapter, from a collaboration with Charles Bordenave, gives a generalization of the Erdös-Gallai theorem. The third chapter, a collaboration with Justin Salez, solves a problem raised in 2004 by Bauer and Golinelli: the existence (or not) of extended states in the limiting spectrum of Erdös-Rényi graphs with parameter d/n. We show the absence of extended states at zero when d < e and the presence of extended states when d > e. Our results extend to the spectra of unimodular Galton-Watson tree. I also prove the absence of extended states at zero in the spectrum of the skeleton tree. The last chapter is a collaboration with Charles Bordenave and Raj Rao Nadakuditi. We study the eigenvalues of the adjacency matrix A of a directed Erdös-Rényi graph with parameter d/n, in which the edges are weighted by the entries of a symmetric matrix P. We show a spectacular phase transition: there is a threshold Theta depending on P and d such that the largest eigenvalues of (n/d)A converge to the eigenvalues of P which are greater than Theta. The associated eigenvectors of A are aligned with those of P
Erra, Robert. "Sur quelques problemes inverses structures de valeurs propres et de valeurs singulieres." Rennes 1, 1996. http://www.theses.fr/1996REN10204.
Petrides, Romain. "Bornes sur des valeurs propres et métriques extrémales." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10234/document.
This thesis is devoted to the study of the Laplace eigenvalues and the Steklov eigenvalues on Riemannian manifolds. We look for optimal bounds among the set of metrics, lying in a conformal class or not. We also characterize, if they exist the metrics which reach these bounds. These extremal metrics have properties from the theory of minimal surfaces. First, we are interested in the upper bound of Laplace eigenvalues in a class of conformal metrics, called the conformal eigenvalues. In Chapter 1, we estimate the second conformal eigenvalue of the standard sphere. In Chapters 2 and 3, we prove that the first conformal eigenvalue of a Riemannian manifold is greater than the one of the standard sphere of same dimension, with equality only for the standard sphere. Then, we look for existence and regularity results for metrics which maximize eigenvalues on surfaces, in a given conformal class or not. In Chapters 3 and 4, we prove an existence result for Laplace eigenvalues. In Chapter 6, the work is done for Steklov eigenvalues. Finally, in Chapter 5, obtained in collaboration with Paul Laurain, we prove a regularity and quantification result for harmonic maps with free boundary on a Riemannian surface. It is a key component for Chapter 6
Chrayteh, Houssam. "Problèmes de valeurs propres pour des opérateurs multivoques." Poitiers, 2012. http://theses.univ-poitiers.fr/25162/2012-Chrayteh-Houssam-These.pdf.
The aim of our research is to study the existence and regularity of solutions for eigenvalue problems involving a →p-multivoque operator A : V → P(V*) on a smooth domain Ω C Rᶰ. Through N-functions, we construct a →p-multivoque Leray-Lions "strongly monotonic" operator on an anisotropic Orlicz-Sobolev space. We note that the theoretical formulation of problems related to such operator is essentially based on the notion of Clarke subdifferential. For this reason, we introduce new variational methods that match the resolution of these issues in the "subcritical" case where compactness plays an important role and critical case when we lose compactness. Various applications are given to illustrate our abstract results, for example, an anisotropic operator with variable exponents and an operator with a Hardy type weight
Makhoul, Ola. "Inégalités universelles pour les valeurs propres d'opérateurs naturels." Thesis, Tours, 2010. http://www.theses.fr/2010TOUR4006/document.
In this thesis, we generalize the Yang and the Levitin and Parnovski universalinequalities, concerning the eigenvalues of the Dirichlet Laplacian on a Euclideanbounded domain, to the case of the Hodge-de Rham Laplacian on a Euclidean closed submanifold.This gives an extension of Reilly’s inequality and Asada’s inequality, concerningthe first eigenvalues of the Laplacian and the Hodge-de Rham Laplacian respectively, toall eigenvalues of these operators. We also obtain a new abstract inequality relating theeigenvalues of a self-adjoint operator on a Hilbert space to two families of symmetric andskew-symmetric operators and their commutators. This inequality is proved useful both forunifying and for improving numerous known results concerning the Laplacian, the Hodgede Rham Laplacian, the square of the Dirac operator and more generally the Laplacianacting on sections of a Riemannian vector bundle on a Euclidean submanifold, the KohnLaplacian, a power of the Laplacian...In the last part, we obtain an upper bound for thefirst eigenvalue of Steklov problem on a domain Ω of a Euclidean or a spherical submanifoldin terms of the r-th mean curvatures of ∂Ω
Khelifi, Mohamed. "Algorithme de Lanczos pour le calcul numérique des valeurs et vecteurs propres de matrices non symètriques de grande taille." Lille 1, 1989. http://www.theses.fr/1989LIL10108.
Le, Peutrec Dorian. "Études de petites valeurs propres du Laplacien de Witten." Phd thesis, Université Rennes 1, 2009. http://tel.archives-ouvertes.fr/tel-00452849.
Braconnier, Thierry. "Sur le calcul des valeurs propres en précision finie." Nancy 1, 1994. http://www.theses.fr/1994NAN10023.
Emad, Petiton Nahid. "Contribution à la résolution de grands problèmes de valeurs propres." Paris 6, 1989. http://www.theses.fr/1989PA066174.
Barbe, Jacques. "Asymptotiques de valeurs propres par le principe de birman-schwinger." Nantes, 1996. http://www.theses.fr/1996NANT2015.
Ziad, Abderrahmane. "Contributions au calcul numérique des valeurs propres des matrices normales." Saint-Etienne, 1996. http://www.theses.fr/1996STET4001.
Godet-Thobie, Stéphane. "Valeurs propres de matrices fortement non normales en grande dimension." Paris 9, 1993. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1993PA090022.
Rammal, Hadia. "Problèmes de Complémentarité aux Valeurs Propres : Théories, Algorithmes et Applications." Limoges, 2013. http://aurore.unilim.fr/theses/nxfile/default/08806eb2-33e6-4642-b821-b7218aaac0f2/blobholder:0/2013LIMO4036.pdf.
This manuscript deals with the development of mathematical methods applicable to the theoretical and numerical study of a wide class of unilateral problems. To put it more precisely, we consider the Pareto and Lorentz cones eigenvalue complementarity problems PCVP. Such problems appear in many scientific disciplines such as physics, mechanics and engineering. Firstly, we are interested to the resolution of PCVP using an adequate method, “Lattice Projection Method LPM”, leading to an efficient and effective result. The originality of this formulation in comparison with the existing literature is that it is not based on the complementarity approach. Then, our contribution is reflected in the study of the non-singularity conditions of the Jacobian matrices used in the semismooth Newton method SNM to detect solutions of such problems. Then, by using the performance profiles, we compare LPM with other solvers known in the literature. The results prove in accordance with the experimental observations and show the efficiency of LPM. Secondly, we treat the stochastic case of PCVP in the sense of Pareto and Lorentz cones. We reformulate such problem to find the zeros of a semismooth function. Furthermore, we study the non-singularity conditions of the Jacobian matrix of this function to solve such problems. Moreover, we transform the problem as a constrained minimization reformulation. Finally, we discuss the inverse Pareto eigenvalue complementarity problem PICVP. This task focuses more precisely on the resolution of PICVP where we present a new method, “Inverse Lattice Projection Method ILPM”, to solve such problems
Vasilchuk, Vladimir. "Sur la distribution limite des valeurs propres des matrices aléatoires." Paris 7, 2001. http://www.theses.fr/2001PA077265.
This thesis deals with the limit eigenvalue distributions of deformed and unitary invatiant ensembles of random matrices. The convergence of the normalized counting rmeasure of random eigenvalues to the non random limit is studied as well as its fluctuations
Batchelor, Philipp. "Dérivées des valeurs propres du laplacien sur des variétés qui dégénèrent /." [S.l.] : [s.n.], 1997. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=12009.
Djellit, Ali. "Valeurs propres de problèmes elliptiques indéfinis sur des ouverts non bornés." Toulouse 3, 1992. http://www.theses.fr/1992TOU30072.
Féral, Delphine. "Grandes déviations et fluctuations des valeurs propres maximales de matrices aléatoires." Toulouse 3, 2006. http://www.theses.fr/2006TOU30249.
This PhD thesis lies within the scope of Random Matrix Theory. In the first part, we study some models called Coulomb gas. We obtain in particular a large deviation principle for the spectral measure of discrete Coulomb gas which are the discrete analogues of the classical continuous Coulomb gas models met in Random Matrix Theory. We also consider the Generalised Inverse Gaussian random matrix model. In the second part, we establish the universality of the fluctuations of the largest eigenvalue of Deformed Wigner matrices which are Hermitian Wigner matrices (whose entries have sub-Gaussians moments) perturbed by a deterministic matrix of rank one. Then, we present some results of a work in progress: we investigate the almost sure convergence of the first largest eigenvalues of some general Deformed Wigner matrices
Stojanovic, Alexandre. "Sur la distribution limite des valeurs propres dans des matrices aléatoires." Paris 7, 2003. http://www.theses.fr/2003PA077184.
Diamoutani, Mamadou. "De quelques méthodes de calcul de valeurs propres de grandes matrices." Grenoble INPG, 1986. http://tel.archives-ouvertes.fr/tel-00321850.
Diamoutani, Mamadou. "De quelques méthodes de calcul de valeurs propres de grandes matrices." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375971888.
Bessac, François. "Utilisation des valeurs propres et vecteurs propres de couplage pour étudier le comportement vibro-acoustique de systèmes couplés." Phd thesis, INSA de Lyon, 1996. http://tel.archives-ouvertes.fr/tel-00132853.
Fondée sur une approche modale et un formalisme vectoriel, elle s'appuie sur l'exploitation d'une matrice de couplage adimensionnelle qui décrit les échanges entre les deux plaques. Cette matrice admet autant de valeurs propres de couplage (quantités totalement déterministes) que de ressorts entre les plaques. Ces valeurs propres sont représentatives de la force du couplage tandis que les vecteurs propres indiquent les chemins modaux de transmissions. L'utilisation de ces quantités propres permet de reconstruire l'état vibratoire des plaques après couplage connaissant leur état avant couplage (en configuration découplée bloquée).
Une méthode simplifiée est développée dans le cas du couplage multiple. Le chemin de transmission dominant est identifié par l'examen et le tri des valeurs propres de couplage. Le fait de ne garder que la contribution correspondant à ce chemin modal dominant donne d'excellents résultats, l'erreur maximum par rapport à la solution de référence atteignant 3 dB aux plus hautes fréquences.
L'application expérimentale de cette méthodologie est possible puisque les valeurs propres de couplage sont mesurables. La méthode s'apparente à une approche de type mobilité, à la différence près que les grandeurs à mesurer sont en configuration découplée bloquée, ce qui permet d'éviter les fréquences singulières inhérentes à l'approche par mobilité classique. Dans des conditions de couplage multiple, l'application de la méthode simplifiée confirme la qualités des résultats obtenus précédemment de façon numérique.
Bessac, François Guyader Jean-Louis. "Utilisation des valeurs propres et vecteurs propres de couplage pour étudier le comportement vibro-acoustique de systèmes couplés." Villeurbanne : Doc'INSA, 2003. http://docinsa.insa-lyon.fr/these/pont.php?id=bessac.
Surchat, Daniel. "Infinite de valeurs propres sous le spectre essentiel du laplacien d'un graphe /." [S.l.] : [s.n.], 1993. http://library.epfl.ch/theses/?nr=1172.
Anane, Aomar. "Etude des valeurs propres et de la résonance pour l'opérateur p-laplacien." Doctoral thesis, Universite Libre de Bruxelles, 1988. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/213321.
Accardo, Jérôme. "Valeurs propres des matrices de Toeplitz et matrices de covariance de processus." Lille 1, 1991. http://www.theses.fr/1991LIL10123.
Attoh, Komdedzi Kwami. "Contributions à l'analyse numérique du problème généralisé de valeurs propres et applications." Saint-Etienne, 1993. http://www.theses.fr/1993STET4006.
Diamoutani, Mamadou Chatelin Françoise. "De quelques méthodes de calcul de valeurs propres de matrices de grande taille." S.l. : Université Grenoble 1, 2008. http://tel.archives-ouvertes.fr/tel-00321850.
Ouanes, Ilhem. "Le régime juridique des valeurs mobilières composées." Paris 1, 1998. http://www.theses.fr/1998PA010257.
Conrad, Francis. "Perturbation de problèmes aux valeurs propres non linéaires et problèmes à frontière libre." Phd thesis, Université Claude Bernard - Lyon I, 1986. http://tel.archives-ouvertes.fr/tel-00830638.
Croquet, Rémi. "Etude des dispersions et incertitudes en optimisation et dans l'analyse des valeurs propres." Phd thesis, INSA de Rouen, 2012. http://tel.archives-ouvertes.fr/tel-00740583.
Heuveline, Vincent. "Acceleration polynomiale pour le probleme aux valeurs propres et portraits spectraux de matrices." Rennes 1, 1997. http://www.theses.fr/1997REN10003.
Vigo, Guillaume. "Méthodes de décomposition orthogonale aux valeurs propres appliquées aux écoulements instationnaires compressibles complexes." Paris 9, 2000. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=2000PA090057.
Hassannezhad, Asma. "Bornes supérieures pour les valeurs propres d'opérateurs naturels sur les variétés riemanniennes compactes." Thesis, Tours, 2012. http://www.theses.fr/2012TOUR4036/document.
The purpose of this thesis is to find upper bounds for the eigenvalues of natural operators acting on functions on a compact Riemannian manifold (M; g) such as the Laplace–Beltrami operator and Laplace-type operators. In the case of the Laplace-Beltrami operator, two aspects are investigated: The first aspect is to study relationships between the intrinsic geometry and eigenvalues of the Laplacian operator. In this regard, we obtain upper bounds depending only on the dimension and a conformal invariant called min-conformal volume. Asymptotically, these bounds are consistent with the Weyl law. They improve previous results by Korevaar and Yang and Yau. The method which is introduced to obtain the results, is powerful and interesting in itself. The second aspect is to study the interplay of the extrinsic geometry and eigenvalues of the Laplace–Beltrami operator acting on compact submanifolds of RN and of CPN. We investigate an extrinsic invariant called the intersection index studied by Colbois, Dryden and El Soufi. For compact submanifolds of RN, we extend their results and obtain upper bounds which are stable under small perturbation. For compact submanifolds of CPN, we obtain an upper bound depending only on the degree of submanifolds. For Laplace type operators, a modification of our method lead to have upper bounds for the eigenvalues of Schrödinger operators in terms of the min-conformal volume and integral quantity of the potential. As another application of our method, we obtain upper bounds for the eigenvalues of the Bakry–Émery Laplace operator depending on conformal invariants
Sango, Mamadou. "Valeurs propres et vecteurs propres de problèmes elliptiques non-autoadjoints avec un poids indéfini pour des systèmes d'équations aux dérivées partielles." Valenciennes, 1998. https://ged.uphf.fr/nuxeo/site/esupversions/73e24869-db40-4b04-99c0-2d4c9520e3a0.
Mezher, Dany. "Calcul parallèle de pseudo-spectres." Rennes 1, 2001. http://www.theses.fr/2001REN10054.
Krikorian, Raphaël. "Reductibilite des systemes produits croises quasi-periodiques a valeurs dans des groupes compacts." Palaiseau, Ecole polytechnique, 1996. http://www.theses.fr/1996EPXX0004.
Hassannezhad, Asma. "Bornes supérieures pour les valeurs propres des opérateurs naturels sur des variétés Riemanniennes compactes." Phd thesis, Université François Rabelais - Tours, 2012. http://tel.archives-ouvertes.fr/tel-00708829.
Bouras, Amina. "Contrôle de convergence de solveurs emboîtés pour le calcul de valeurs propres avec inversion." Toulouse 1, 2000. http://www.theses.fr/2000TOU10071.
Ben, Ammou Saloua. "Comportement des valeurs propres en analyse des correspondances multiples sous certaines hypothèses de modèles." Paris 9, 1996. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1996PA090044.
Multiple Correspondence Analysis and Log-Linear modelling are two techniques of multi-way contingency table analysis having different problematics and fields of application. Log-Linear models are profitably applied to a little number of variables. Multiple Correspondence Analysis is usefùl with large tables. This efficiency is balanced by the fact that MCA explicits relations between only two variables, and isn’t able to explicit relation between more than two, as can be done by Log-Linear modelling. The two approaches are complementary. The aim of this thesis is to study the behaviour of eigenvalues in Multiple Correspondence Analysis when data fit a known Log-Linear model, then to induct this model by successive utilisation of MCA. The innovation in this approach is the use of eigenvalues diagram in the détermination of the Log-Linear model. Affer giving a reminder of MCA, Log-Linear modelling, and study of behaviour of eigenvalues in Correspondence Analysis, we présent the distribution of eigenvalues in MCA under some hypothesis modelling. At the end of this work we propose an algorithm fitting progressively the Log-Linear model where the fitting test is based on eigenvalues diagram. The algorithm is validated on three sets of data used in literature
Munnier, Alexandre. "Stabilité de liquides en apesanteur : régularité maximale de valeurs propres pour certaines classes d'opérateurs." Besançon, 2000. http://www.theses.fr/2000BESA2048.
Fender, Alexandre. "Solutions parallèles pour les grands problèmes de valeurs propres issus de l'analyse de graphe." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLV069/document.
Graphs, or networks, are mathematical structures to represent relations between elements. These systems can be analyzed to extract information upon the comprehensive structure or the nature of individual components. The analysis of networks often results in problems of high complexity. At large scale, the exact solution is prohibitively expensive to compute. Fortunately, this is an area where iterative approximation methods can be employed to find accurate estimations. Historical methods suitable for a small number of variables could not scale to large and sparse matrices arising in graph applications. Therefore, the design of scalable and efficient solvers remains an essential problem. Simultaneously, the emergence of parallel architecture such as GPU revealed remarkable ameliorations regarding performances and power efficiency. In this dissertation, we focus on solving large eigenvalue problems a rising in network analytics with the goal of efficiently utilizing parallel architectures. We revisit the spectral graph analysis theory and propose novel parallel algorithms and implementations. Experimental results indicate improvements on real and large applications in the context of ranking and clustering problems
Loubeau, Vincent. "Sur un modèle de combustion solide-solide à énergie d'activation finie." Bordeaux 1, 1992. http://www.theses.fr/1992BOR10596.