Download or read book Etude dynamique et statistique de l interaction onde particule written by Marie-Christine Firpo and published by . This book was released on 1999 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: ON S'INTERESSE D'ABORD AU CHAOS, VIA LE PLUS GRAND EXPOSANT DE LYAPUNOV L, ASSOCIE A LA DYNAMIQUE UNIDIMENSIONNELLE DE N PARTICULES INTERAGISSANT VIA DES FORCES A LONGUE PORTEE. POUR UN TEL HAMILTONIEN AYANT UN POTENTIEL ATTRACTIF ET SOUMIS A UNE TRANSITION DE PHASE DE SECOND ORDRE, L'UTILISATION D'UNE APPROCHE GEOMETRIQUE PERMET D'ESTIMER ANALYTIQUEMENT L EN FONCTION DE N ET DE LA DENSITE D'ENERGIE DANS LA LIMITE D'UN GRAND NOMBRE DE PARTICULES. L'ANALYSE PREDIT QUE : - DANS LA PHASE CONDENSEE, L EST POSITIF ET FINI POUR N INFINI, ET N'EST PAS MAXIMAL A LA TRANSITION MAIS LEGEREMENT EN-DESSOUS, - DANS LA PHASE LIBRE, LE CHAOS S'ANNULE POUR N INFINI AVEC UNE LOI D'ECHELLE EN N A LA PUISSANCE MOINS UN TIERS EN ACCORD AVEC LES RESULTATS NUMERIQUES. LA NATURE LONGUE PORTEE DE L'INTERACTION COULOMBIENNE FAVORISE L'EXISTENCE D'EFFETS COLLECTIFS DANS LES PLASMAS ET, SOUS CERTAINES CONDITIONS, INDUIT UNE DYNAMIQUE EFFECTIVE COUPLANT UN PETIT NOMBRE M DE MODES D'OSCILLATION COLLECTIFS (ONDES DE LANGMUIR) A UN FAISCEAU DE N PARTICULES SUSCEPTIBLES DE RESONNER AVEC EUX. UNE MODELISATION DE CE COUPLAGE ONDE-PARTICULE EST FOURNIE PAR UN HAMILTONIEN DIT AUTO-COHERENT PRESERVANT LA REVERSIBILITE DE LA DYNAMIQUE MICROSCOPIQUE. ON ETABLIT D'ABORD LA CONVERGENCE DE LA DYNAMIQUE MICROSCOPIQUE VERS LA SOLUTION CINETIQUE, OBTENUE DANS LA LIMITE D'UN NOMBRE INFINI DE PARTICULES, SUR TOUT INTERVALLE DE TEMPS BORNE. EN SE LIMITANT AU CAS D'UNE SEULE ONDE, LA QUESTION DU NIVEAU ASYMPTOTIQUE DE SON INTENSITE I DANS LE PROBLEME DE L'INSTABILITE FAISCEAU-PLASMA EST ABORDEE PAR UN TRAITEMENT DE MECANIQUE STATISTIQUE D'EQUILIBRE. IL APPARAIT QUE LE REGIME D'AMORTISSEMENT LANDAU EST GENERIQUEMENT ASSOCIE A UNE TRANSITION DE PHASE DE SECOND ORDRE, ADMETTANT POUR PARAMETRE D'ORDRE I/N, NOTE ICI P. UNE INTENSITE INITIALE CRITIQUE P0C EST OBTENUE : LA THERMODYNAMIQUE PREDIT UN NIVEAU D'EQUILIBRE POUR P, S'ANNULANT DANS LA LIMITE CINETIQUE SI P0 EST INFERIEUR A P0C, RESTANT A UN NIVEAU FINI SINON.
Download or read book Dynamics and Thermodynamics of Systems with Long Range Interactions written by Thierry Dauxois and published by Springer. This book was released on 2008-01-11 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: Properties of systems with long range interactions are still poorly understood despite being of importance in most areas of physics. The present volume introduces and reviews the effort of constructing a coherent thermodynamic treatment of such systems by combining tools from statistical mechanics with concepts and methods from dynamical systems. Analogies and differences between various systems are examined by considering a large range of applications, with emphasis on Bose--Einstein condensates. Written as a set of tutorial reviews, the book will be useful for both the experienced researcher as well as the nonexpert scientist or postgraduate student.
Download or read book Physics of Long range Interacting Systems written by Alessandro Campa and published by Oxford University Press, USA. This book was released on 2014 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with an important class of many-body systems: those where the interaction potential decays slowly for large inter-particle distances; in particular, systems where the decay is slower than the inverse inter-particle distance raised to the dimension of the embedding space. Gravitational and Coulomb interactions are the most prominent examples, however it has become clear that long-range interactions are more common than previously thought. A satisfactory understanding of properties, generally considered as oddities only a couple of decades ago, has now been reached: ensemble inequivalence, negative specific heat, negative susceptibility, ergodicity breaking, out-of-equilibrium quasi-stationary-states, anomalous diffusion. The book, intended for Master and PhD students, tries to gradually acquaint the reader with the subject. The first two parts describe the theoretical and computational instruments needed to address the study of both equilibrium and dynamical properties of systems subject to long-range forces. The third part of the book is devoted to applications of such techniques to the most relevant examples of long-range systems.
Download or read book Dynamique non lin aire de l interaction onde particule dans le cas de spectres larges written by Brigitte Ragot and published by . This book was released on 1995 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA THEORIE QUASI-LINEAIRE JUSTIFIE LA DIFFUSION DE PARTICULES CHARGEES DANS UN SPECTRE LARGE D'ONDES PAR UNE DECORRELATION DE LA DYNAMIQUE POUR DES TEMPS LONGS COMPARES AU TEMPS D'AUTOCORRELATION DU CHAMP. ELLE SUPPOSE AUSSI QUE LES MODES DU SPECTRE CROISSENT EXPONENTIELLEMENT AVEC LE TAUX DE CROISSANCE DE LANDAU. L'ETUDE DE LA DYNAMIQUE NON LINEAIRE DES PARTICULES PERMET D'ETABLIR, DANS LE CADRE DE L'INTERACTION ONDE-PARTICULE, UNE EQUATION D'EVOLUTION POUR UNE HARMONIQUE DU CHAMP, EXPLIQUANT LES CORRELATIONS DE MODES OBSERVEES EXPERIMENTALEMENT ET NUMERIQUEMENT. CETTE ETUDE MET EN EVIDENCE UN TEMPS ESSENTIEL A LA COMPREHENSION DES PHENOMENES PHYSIQUES: LE TEMPS NON LINEAIRE D'INTERACTION ONDE-PARTICULES NL PROPORTIONNEL A LA DENSITE SPECTRALE D'ENERGIE A LA PUISSANCE -1/3. C'EST LE TEMPS DE CORRELATION DE LA DYNAMIQUE. POUR DES TEMPS INFERIEURS, LES TRAJECTOIRES DES PARTICULES SUIVENT UN ENSEMBLE QUASI-FRACTAL DE DIMENSION 2, CE QUI DONNE UN COEFFICIENT DE DIFFUSION MALGRE UNE TRES FAIBLE SENSIBILITE AUX CONDITIONS INITIALES. POUR DES TEMPS LONGS COMPARES A TAU NL S'ETABLIT UN REGIME DE DIFFUSION PLUS CLASSIQUE, AVEC MELANGE DANS L'ESPACE DES PHASES. ET POUR DES PARAMETRES DE RECOUVREMENT DONNANT NUMERIQUEMENT DES ECARTS A LA QUASI-LINEARITE, LA VALEUR DU COEFFICIENT DE DIFFUSION EST RETROUVEE ANALYTIQUEMENT. LE COEFFICIENT DE DIFFUSION EST EGALEMENT EXPRIME EN FONCTION DU TAUX DE CROISSANCE SOUS FORME D'UNE RELATION INTEGRALE, FAISANT CLAIREMENT APPARAITRE L'INTERVALLE DE NOMBRES D'ONDE SUR LEQUEL LA FORMULE DE LA THEORIE QUASI-LINEAIRE DOIT ETRE INTEGREE. ENFIN, TOUS CES RESULTATS, INITIALEMENT ETABLIS POUR UN SPECTRE DE LANGMUIR UNIDIMENSIONNEL, SONT ETENDUS AU CAS DE MODES SIFFLEURS. INDEPENDAMMENT DE CETTE ETUDE EST AUSSI DEMONTREE LA SINGULARITE DES ECARTS A LA QUASI-LINEARITE DU MAPPING STANDARD, NON LIES AUX MODES BALISTIQUES DU SYSTEME, ET QUI PEUVENT ETRE RETROUVES PAR LE TEMPS DE TRANSIT MOYEN
Download or read book Microscopic Dynamics of Plasmas and Chaos written by Y Elskens and published by CRC Press. This book was released on 2019-09-17 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microscopic Dynamics of Plasmas and Chaos discusses the resonant wave-particle interaction in plasmas, provides the tools for chaotic Hamiltonian dynamics, and describes a turbulent macroscopic system through the chaotic classical mechanics of the corresponding N-body problem. The book begins with the fundamentals of N-body dynamics, followed by a
Download or read book M canique statistique et dynamique hors quilibre de syst mes avec interactions longue port e written by Julien Barré and published by . This book was released on 2003 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: La présence d'interactions à longue portée induit des propriétés très particulières : énergie non additive, dynamique chohérente à lé́chelle du système entier... Ces propirétés spécifiques ne dépendent pas de la nature de l'interaction à longue portée, qui peut avoir une origine variée (gravitationnnelle, Coulombienne non écrantée, interaction entre vortex en turbulence 2D, couplage ondes-particules...); le but de cette thèse est d'explorer l'universatlité des comportements de ces systèmes avec interactions à longue partée. Nous partons donc de modèles jouets simples, pour dégager des méthodes et résultats généraux. Nous étudions d'abord la mécanique statistique d'équilibre, dont certaines anomalies sont connues : chaleur spécifique négative, ensembles statistiques inéquivalents par exemple. Nous montrons la présence de ces anomalies sur l'exemple d'un modèle de spins champ moyen exactement soluble, autour d'un point tricritique. Nous utilisons ensuite une méthode générale fondée sur la théorie des grandes déviations pour résoudre la mécanique statistique des systèmes à longue portée, dans les ensembles canonique et microcanonique, et nous l'appliquons à plusieurs systèmes dont la solution microcanonique était jusqu'ici inaccesssible. A partir de ces résultats, nous classifions les différentes situations possibles d'inéquivalence entre les ensembles. Puis nous nous intéressons à la dynamique hors équilibre des systèmes avec interactions à longue portée : nous étudions en détail un exemple de formation de structures, et nous présentons et illustrons un scénario général de la relaxation lente vers l'équilibre, fondée sur le lien étroit avec l'équation de Vlasov. Enfin, nous appliquons les idées et méthodes mises en évidence à un modèle simple de laser à électrons libres, ce qui fournit une approche originale, complémentaire à l'étude habituelle purement dynamique de ce type de lasers.
Download or read book tude probabiliste de syst mes de particules en interaction written by Raphaël Roux and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail présente quelques résultats sur les systèmes de particules en interaction pour l'interprétation probabiliste des équations aux dérivées partielles, avec des applications à des questions de dynamique moléculaire et de chimie quantique. On présente notamment une méthode particulaire permettant d'analyser le processus de la force biaisante adaptative, utilisé en dynamique moléculaire pour le calcul de différences d'énergies libres. On étudie également la sensibilité de dynamiques stochastiques par rapport à un paramètre, en vue du calcul des forces dans l'approximation de Born-Oppenheimer pour rechercher l'état quantique fondamental de molécules. Enfin, on présente un schéma numérique basé sur un système de particules pour résoudre des lois de conservation scalaires, avec un terme de diffusion anormale se traduisant par une dynamique de sauts sur les particules.
Download or read book Quantum Mechanics Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Download or read book Memoirs of the Scientific Sections of the Academy of the Socialist Republic of Romania written by and published by . This book was released on 1987 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atti del Convegno sulla relativit generale problemi di energia e onde gravitazionali written by Comitato nazionale per le manifestazioni celebrative del 4° centenario della nascità di Galileo Galilei. Convegno (1964, 9-12 septembre. Florence) and published by . This book was released on 1966 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamental Systems in Quantum Optics written by J. Dalibard and published by North Holland. This book was released on 1992 with total page 1172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hardbound. This book focuses on the new concepts and techniques which have deeply revitalized the field of quantum optics in the last decade. It is now possible to manipulate a simple quantum system (a single atom, ion or molecule, or a single mode of the radiation field) interacting with a well controlled environment. Fundamental aspects of matter-radiation interaction, which up to now have remained hidden due to the statistical character of observable quantities, become directly accessible. The conceptual simplicity of those quantum systems paves the way to direct verifications of the basic prerequisites of the quantum theory. The topics discussed include cavity quantum electrodynamics, noise in quantum optics, laser cooling, non-linear optics, multistability, quantum optics and relativity, cold atomichydrogen atom and collective quantum effects, trapped ioncrystallization. Related fields such as low energy tests of gaugetheories, semi classical meth
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1993-03 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bulletin Signal tique written by Centre national de la recherche scientifique (France). Centre de documentation and published by . This book was released on 1962 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book What is Space Time Made Of written by David Izabel and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the first part of this book, the author synthesizes the main results and formulas of physics-Albert Einstein's, with general relativity, gravitational waves involving elastic deformable space-time, quantum field theory, Heisenberg's principle, and Casimir's force implying that a vacuum is not nothingness. In the second part, based on these scientific facts, the author re-studies the fundamental equation of general relativity in a weak gravitational field by unifying it with the theory of elasticity. He considers the Ligo and Virgo interferometers as strain gauges. It follows from this approach that the gravitational constant G, Einstein's constant κ, can be expressed as a function of the physical, mechanical and elastic characteristics of space-time. He overlaps these results and in particular Young's modulus of space-time, with publications obtained by renowned scientists. By imposing to satisfy the set of universal constants G, c, κ, ħ and by taking into account the vacuum data, he proposes a new quantum expression of G which is still compatible with existing serious publications. It appears that time becomes the lapse of time necessary to transmit information from one elastic sheet of space to another. Time also becomes elastic. Thus, space becomes an elastic material, with a particle size of the order of the Planck scale, a new deformable ether, therefore different from the non-existent luminiferous ether. Finally, in the third part, in appendices, the author demonstrates the fundamentals of general relativity, cosmology and the theory of elasticity.
Download or read book X Ray and Neutron Dynamical Diffraction written by André Authier and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume collects the proceedings of the 23rd International Course of Crystallography, entitled "X-ray and Neutron Dynamical Diffraction, Theory and Applications," which took place in the fascinating setting of Erice in Sicily, Italy. It was run as a NATO Advanced Studies Institute with A. Authier (France) and S. Lagomarsino (Italy) as codirectors, and L. Riva di Sanseverino and P. Spadon (Italy) as local organizers, R. Colella (USA) and B. K. Tanner (UK) being the two other members of the organizing committee. It was attended by about one hundred participants from twenty four different countries. Two basic theories may be used to describe the diffraction of radiation by crystalline matter. The first one, the so-called geometrical, or kinematical theory, is approximate and is applicable to small, highly imperfect crystals. It is used for the determination of crystal structures and describes the diffraction of powders and polycrystalline materials. The other one, the so-called dynamical theory, is applicable to perfect or nearly perfect crystals. For that reason, dynamical diffraction of X-rays and neutrons constitutes the theoretical basis of a great variety of applications such as: • the techniques used for the characterization of nearly perfect high technology materials, semiconductors, piezoelectric, electrooptic, ferroelectric, magnetic crystals, • the X-ray optical devices used in all modem applications of Synchrotron Radiation (EXAFS, High Resolution X-ray Diffractometry, magnetic and nuclear resonant scattering, topography, etc. ), and • X-ray and neutron interferometry.
Download or read book Le Golfe Du Saint Laurent petit Oc an Ou Grand Estuaire written by Canada. Department of Fisheries and Oceans and published by Peches Et Oceans Direction Generale Des Communications = Fisheries and Oceans Communications Dir. This book was released on 1991 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a workshop, the scientific reviews and the contributed papers presented at the symposium. The document presents a brief historical summary of marine research in the Gulf; reports the discussions, conclusions and recommendations of the different working groups on oceanography (physics, biology, chemistry and sedimentology) and on the fishery (fish and invertebrates); then presents the discussions of each multidisciplinary working group, centered around how the St. Lawrence system may be used as a natural laboratory which will contribute to the solution of major long-term problems of conservation of natural resources and of the quality of the environment.
Download or read book Government Reports Annual Index written by and published by . This book was released on 1993 with total page 1290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
