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Author: Eric Ringeisen
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Languages : fr
Pages : 0
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Author: Eric Ringeisen
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Languages : fr
Pages : 0
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Author: Cédric Villani
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Languages : fr
Pages : 456
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Author: Cédric Villani
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Languages : fr
Pages : 0
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Author: Cédric Villani
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Languages : en
Pages : 0
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Nous étudions des équations cinétiques de la forme f/t + v. *#xf = q(f, f), t0, x, r#n, v, r#n, qui décrivent l'évolution d'un gaz ou d'un plasma dans lequel les particules subissent des collisions modélisées par l'opérateur q, dit - de Boltzmann : q(f, f) dv#* d b(v v#*,) (f'f'#* ff#*), - ou de Landau : q(f, f) = /v#i dv#*a#i#j(v v#*) (f♯*f/v#j ff#*/v#*#, #j). Les trois premières parties de cette thèse concernent les équations homogènes (indépendantes de x) #tf = q(f, f). On insiste particulièrement sur deux points : les collisions rasantes et la dissipation d'entropie. Dans la première partie, on étudie le problème de Cauchy associé aux équations de Boltzmann et de Landau homogènes (pour des sections efficaces réalistes et éventuellement singulières), des propriétés de régularité des solutions, ainsi que l'asymptotique des collisions rasantes qui permet de passer d'une équation à l'autre. La deuxième partie est consacrée au cas particulier des molécules maxwelliennes. Sous cette hypothèse, on effectue une étude détaillée du problème de Cauchy et du retour vers l'équilibre, ainsi que des liens entre théorie cinétique et théorie de l'information. Dans la troisième partie, on utilise les résultats précédents pour obtenir des estimations explicites sur la vitesse de retour vers l'équilibre dans le cas général. Dans la quatrième partie, on obtient des résultats partiels sur le problème de Cauchy pour l'équation de Landau inhomogène, et quelques estimations nouvelles sur l'équation de Boltzmann inhomogène. Enfin, dans la cinquième partie, on établit diverses formes conservatives de l'opérateur de Boltzmann, avec application à l'asymptotique des collisions rasantes.
Author: Henri Berestycki
Publisher: Springer Science & Business Media
ISBN: 9781402009723
Category : Mathematics
Languages : en
Pages : 554
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Nonlinear partial differential equations abound in modern physics. The problems arising in these fields lead to fascinating questions and, at the same time, progress in understanding the mathematical structures is of great importance to the models. Nevertheless, activity in one of the approaches is not always sufficiently in touch with developments in the other field. The book presents the joint efforts of mathematicians and physicists involved in modelling reactive flows, in particular superconductivity and superfluidity. Certain contributions are fundamental to an understanding of such cutting-edge research topics as rotating Bose-Einstein condensates, Kolmogorov-Zakharov solutions for weak turbulence equations, and the propagation of fronts in heterogeneous media.
Author: Laurent Desvillettes
Publisher:
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Category :
Languages : fr
Pages : 134
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CETTE THESE A POUR OBJET L'ETUDE MATHEMATIQUE DE CERTAINS PROBLEMES LIES A LA THEORIE CINETIQUE DES GAZ ET DES PLASMAS. NOUS NOUS INTERESSONS TOUT D'ABORD AUX PROBLEMES DE VITESSE DE CONVERGENCE VERS L'EQUILIBRE POUR UN GAZ MODELISE PAR L'EQUATION DE BOLTZMANN OU DE KAC, OU POUR UN PLASMA DECRIT GRACE A L'EQUATION DE FOKKER-PLANCK-LANDAU. NOUS DONNONS UNE MINORATION DE LA DISSIPATION D'ENTROPIE POUR CHACUNE DE CES EQUATIONS PAR LA DISTANCE A L'EQUILIBRE, DANS LE CAS DE DENSITES BORNEES INFERIEUREMENT. ENSUITE, NOUS MONTRONS MATHEMATIQUEMENT QUE LA CONVERGENCE VERS L'EQUILIBRE A EFFECTIVEMENT LIEU POUR LES SOLUTIONS RENORMALISEES DE L'EQUATION DE BOLTZMANN DANS UN DOMAINE BORNE AVEC DES CONDITIONS DE REFLEXION SPECULAIRE SUR LES BORDS, ET NOUS DONNONS LA FORME DE LA LIMITE. NOUS MONTRONS EGALEMENT CE RESULTAT DANS LE CAS D'UN PLASMA VERIFIANT L'EQUATION DE VLASOSV-POISSON-BOLTZMANN, CE QUI AMENE A CONSIDERER UNE EQUATION ELLIPTIQUE NON LINEAIRE ET NON LOCALE, POUR LAQUELLE NOUS PROUVONS L'EXISTENCE ET L'UNICITE D'UNE SOLUTION REGULIERE. NOUS NOUS CONSACRONS ENSUITE A L'ETUDE DE LA VALIDITE DE LA METHODE NUMERIQUE DE SPLITTING POUR LES EQUATIONS DU TRANSFERT RADIATIF ET DE VLASOV-MAXWELL. ENFIN, NOUS DONNONS UNE METHODE FORMELLE PERMETTANT DE PASSER DU NOYAU DE BOLTZMANN A CELUI DE FOKKER-PLANCK-LANDAU, ET NOUS PROUVONS SA VALIDITE DANS LE CADRE DES EQUATIONS LINEARISEES. NOUS CONCLUSONS EN ETENDANT LE RESULTAT PRECEDENT A L'EQUATION DE KAC
Author: Elaine McKinnon Riehm
Publisher: American Mathematical Soc.
ISBN: 0821869140
Category : Mathematics
Languages : en
Pages : 287
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Despite the renown of the Fields Medals, J.C. Fields has been until now a rather obscure figure, and recovering details about his professional activities and personal life was not at all a simple task. This work is a triumph of persistence with far-flung archival and documentary sources, and provides a rich non-mathematical portrait of the man in all aspects of his life and career. Highly readable and replete with period detail, the book sheds useful light on the mathematical and scientific world of Fields' time, and is sure to remain the definitive biographical study. --Tom Archibald, Simon Fraser University, Burnaby, BC, Canada Drawing on a wide array of archival sources, Riehm and Hoffman provide a vivid account of Fields' life and his part in the founding of the highest award in mathematics. Filled with intriguing detail--from a childhood on the shores of Lake Ontario, through the mathematics seminars of late 19th century Berlin, to the post-WW1 years of the fragmented international mathematical community--it is a richly textured story engagingly and sympathetically told. Read this book and you will understand why Fields never wanted the medal to bear his name and yet why, quite rightly, it does. --June Barrow-Green, Open University, Milton Keynes, United Kingdom One of the little-known effects of World War I was the collapse of international scientific cooperation. In mathematics, the discord continued after the war's end and after the Treaty of Versailles had been signed in 1919. Many distinguished scientists were involved in the war and its aftermath, and from their letters and papers, now almost a hundred years old, we learn of their anguished wartime views and their struggles afterwards either to prolong the schism in mathematics or to end it. J.C. Fields, the foremost Canadian mathematician of his time, was educated in Canada, the United States, and Germany, and championed an international spirit of cooperation to further the frontiers of mathematics. It was during the awkward post-war period that J.C. Fields established the Fields Medal, an international prize for outstanding research, which soon became the highest award in mathematics. J.C. Fields intended it to be an international medal, and a glance at the varying backgrounds of the fifty-two Fields medallists shows it to be so. Who was Fields? What carried him from Hamilton, Canada West, where he was born in 1863, into the middle of this turbulent era of international scientific politics? A modest mathematician, he was an unassuming man. This biography outlines Fields' life and times and the difficult circumstances in which he created the Fields Medal. It is the first such published study.
Author: Roberto Monaco
Publisher: World Scientific
ISBN: 9789812702937
Category : Mathematics
Languages : en
Pages : 600
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This book contains about 20 invited papers and 40 contributed papers in the research areas of theoretical continuum mechanics, kinetic theory and numerical applications of continuum mechanics. Collectively these papers give a good overview of the activities and developments in these fields in the last few years. The proceedings have been selected for coverage in: . OCo Index to Scientific & Technical Proceedings- (ISTP- / ISI Proceedings). OCo Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings). OCo CC Proceedings OCo Engineering & Physical Sciences. Contents: Chaos in Some Linear Kinetic Models (J Banasiak); Inverse Problems in Photon Transport. Part I: Determination of Physical and Geometrical Features of an Interstellar Cloud (A Belleni-Morante et al.); Inverse Problems in Photon Transport. Part II: Features of a Source Inside an Interstellar Cloud (A Belleni-Morante & R Riganti); The Riemann Problem for a Binary Non-Reacting Mixture of Euler Fluids (F Brini & T Ruggeri); Rate of Convergence toward the Equilibrium in Degenerate Settings (L Desvillettes & C Villani); Asymptotic and Other Properties of Positive Definite Integral Measures for Nonlinear Diffusion (J N Flavin); Thermocapillary Fluid and Adiabatic Waves Near its Critical Point (H Gouin); Constitutive Models for Atactic Elastomers (C O Horgan & G Saccomandi); Considerations about the Gibbs Paradox (I Mller); Transport Coefficients in Stochastic Models of the Revised Enskog and Square-Well Kinetic Theories (J Polewczak & G Stell); Some Recent Mathematical Results in Mixtures Theory of Euler Fluids (T Ruggeri); From Kinetic Systems to Diffusion Equations (F Salvarani & J L Vizquez); Non-Boussinesq Convection in Porous Media (B Straughan); and other papers. Readership: Researchers, academics and graduate students working in the fields of continuum mechanics, wave propagation, stability in fluids, kinetic theory and computational fluid dynamics."
Author: Lorenzo Pareschi
Publisher: Nova Publishers
ISBN: 9781594545030
Category : Science
Languages : en
Pages : 238
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The book is divided into three parts, which contain respectively recent results in the kinetic theory of granular gases, kinetic theory of chemically reacting gases, and numerical methods for kinetic systems. Part I is devoted to theoretical aspects of granular gases. Part II presents recent results on modelling of kinetic systems in which molecules can undergo binary collisions in presence of chemical reactions and/or in presence of quantum effects. Part III contains several contributions related to the construction of suitable numerical methods and simulations for granular gases.
Author:
Publisher:
ISBN:
Category : Mathematics
Languages : en
Pages : 612
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