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Modelisation Et Simulation De La Diffusion Multiple Dune Onde Electromagnetique Par Des Particules Cylindriques
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Book Synopsis Modélisation et simulation de la diffusion multiple d'une onde électromagnétique par des particules cylindriques by : Frédéric Pessan
Download or read book Modélisation et simulation de la diffusion multiple d'une onde électromagnétique par des particules cylindriques written by Frédéric Pessan and published by . This book was released on 1998 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'ACCROISSEMENT DES RAYONNEMENTS ELECTROMAGNETIQUES A EU POUR CONSEQUENCES LA CONCEPTION DE MATERIAUX A PROPRIETES ELECTROMAGNETIQUES SPECIFIQUES. LA COMPLEXITE DES BESOINS IMPOSE D'UTILISER DES MATERIAUX HETEROGENES COMPOSES D'INCLUSIONS DE NATURES ET DE FORMES VARIEES DISPERSEES DANS UNE MATRICE DIELECTRIQUE AVEC OU SANS PERTES. CHAQUE INCLUSION POUVANT ETRE DU MEME ORDRE DE GRANDEUR QUE LA LONGUEUR D'ONDE, LA DIFFUSION MULTIPLE DU RAYONNEMENT INCIDENT EST CALCULEE. POUR CELA NOUS ADAPTONS ET ETUDIONS LE MODELE DE MULTIDIFFUSION POUR DES INCLUSIONS SOUS FORME DE FIBRES (CYLINDRES INFINIS). CE TRAVAIL COMPREND LA PARTIE THEORIQUE DE L'ETUDE AINSI QUE L'ETUDE DE QUELQUES APPLICATIONS. LE PLAN DU MEMOIRE S'ARTICULE AUTOUR DE CINQ CHAPITRES : LA DIFFUSION D'UNE ONDE ELECTROMAGNETIQUE PAR UN CYLINDRE ; LA PRESENTATION DU MODELE DE MULTIDIFFUSION AINSI QUE SA MISE EN EQUATIONS ; LA VALIDATION DE L'APPROCHE ET DU CODE INFORMATIQUE POUR DES PETITS SYSTEMES DE CYLINDRES ; LA MISE EN EVIDENCE DE CERTAINES LIMITES DU MODELE ET L'AMELIORATION APPORTEE POUR DES GRANDS SYSTEMES. ENFIN, NOUS TERMINONS PAR L'APPLICATION A L'ETUDE DE MATERIAUX HETEROGENES DENSES.
Book Synopsis Simulation de la diffusion d'une onde électromagnétique sur un groupe de particules en vue de la caractérisation d'un matériau hétérogène by : François de Daran
Download or read book Simulation de la diffusion d'une onde électromagnétique sur un groupe de particules en vue de la caractérisation d'un matériau hétérogène written by François de Daran and published by . This book was released on 1994 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE BUT DE CETTE THESE EST D'ETUDIER LA DIFFUSION D'UNE ONDE ELECTROMAGNETIQUE DANS UN MATERIAU HETEROGENE. LE PREMIER CHAPITRE PRESENTE LES TECHNIQUES DE MESURES EN ESPACE LIBRE QUE NOUS AVONS SPECIFIQUEMENT DEVELOPPEES POUR ETUDIER CE TYPE DE MATERIAUX. ENSUITE NOUS PRESENTONS LA THEORIE DE DIFFUSION DE MIE APPLIQUEE A UNE SPHERE ISOLEE. CETTE THEORIE EST ENSUITE ETENDUE AU CAS D'UN ENSEMBLE DE PARTICULES. ENFIN AU DERNIER CHAPITRE NOUS APPLIQUONS LE MODELE AU CAS D'UN RESEAU PERIODIQUE A DEUX DIMENSIONS
Book Synopsis Diffusion d'une onde électromagnétique par des objets 3D by : Mohammad Kouali
Download or read book Diffusion d'une onde électromagnétique par des objets 3D written by Mohammad Kouali and published by Editions Universitaires Europeennes. This book was released on 2015-11-10 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans ce livre, nous nous interessons a la modelisation electromagnetique et a la simulation du champ diffracte par des scenes complexes et plus particulierement dans un contexte maritime. Les applications de tels modeles sont diverses: observation de surfaces naturelles par teledetection, connaissance de l'environnement (etat de mer, salinite, detection de pollutions, ...), detection d'obstacles dans son environnement naturel (bateaux, objets derivants, avions...). Pour quantifier l'interaction electromagnetique onde surface, deux types d'approches existent: d'une part, des modeles asymptotiques qui reposent sur des hypotheses simplificatrices, d'autre part, des modeles dits rigoureux. Des recherches ont ete menees dans l'equipe pour modeliser rigoureusement la diffusion par un obstacle au-dessus d'une surface de mer pour une scene bidimensionnelle. Ainsi, la methode E-PILE (Extended-Propagation Inside Layer Expansion) a ete developpee et il a ete montre que cette methode est tres efficace pour resoudre des scenes composees de beaucoup d'inconnues."
Book Synopsis Propagation d'impulsions électromagnétiques à énergie dirigée by : Stéphanie Lacroix
Download or read book Propagation d'impulsions électromagnétiques à énergie dirigée written by Stéphanie Lacroix and published by . This book was released on 1996 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE SUJET DE CETTE ETUDE EST RELATIF A LA SIMULATION NUMERIQUE D'UNE ONDE ELECTROMAGNETIQUE SOUS FORME D'IMPULSION, SE PROPAGEANT EN RESTANT LOCALISEE ET EN SE DEFORMANT FAIBLEMENT SUR DE LONGUES DISTANCES. DANS UN PREMIER TEMPS, ON RAPPELLE LES PRINCIPAUX RESULTATS OBTENUS DANS LE DOMAINE ET ON RETIENT L'APPROCHE DE R. ZIOLKOWSKI CONSISTANT A RAMENER LA CONSTRUCTION D'UNE SOLUTION DU SYSTEME DE MAXWELL A CELLE D'UNE SOLUTION DE L'EQUATION DES ONDES VIA LES POTENTIELS DE HERTZ. DANS LE BUT D'ANALYSER NUMERIQUEMENT UN PULSE EDEPT PARTICULIER (LE PULSE MPS), ON PROPOSE, PAR UN CHANGEMENT DE VARIABLES, DE SUIVRE LE SIGNAL DANS UNE FENETRE MOBILE SE PROPAGEANT AVEC L'ONDE A LA VITESSE DE LA LUMIERE. LE PROBLEME MIXTE POUR L'EQUATION DES ONDES DANS LA FENETRE MOBILE EST TRAITE EN DIMENSION UN PUIS EN DIMENSION TROIS DANS UN DOMAINE CYLINDRIQUE. LA PREUVE DE L'EXISTENCE ET DE L'UNICITE DE LA SOLUTION EST ALORS ECRITE A L'AIDE DE LA METHODE DE LIONS. L'ORIGINALITE DE LA DEMARCHE VIENT DU FAIT QUE LE PROBLEME DISCRET INTERMEDIAIRE EST UN SYSTEME DECOUPLE D'EQUATIONS DE KLEIN-GORDON ET NON UN SYSTEME D'EQUATIONS DIFFERENTIELLES ORDINAIRES COMME C'EST HABITUELLEMENT LE CAS DANS UNE METHODE DE GALERKIN. LES SIMULATIONS NUMERIQUES FONDEES SUR LA RESOLUTION DU PROBLEME MIXTE PAR DIFFERENCES FINIES ET PAR APPROXIMATION DE LA METHODE DE GALERKIN CONDUISENT A UNE ETUDE QUALITATIVE DU PULSE MPS
Book Synopsis Diffusion électromagnétique dépendante dans les milieux hétérogènes denses by : Marc Defos du Rau
Download or read book Diffusion électromagnétique dépendante dans les milieux hétérogènes denses written by Marc Defos du Rau and published by . This book was released on 1997 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL PORTE SUR LA MODELISATION DE L'INTERACTION D'UNE ONDE ELECTROMAGNETIQUE AVEC UN MATERIAU HETEROGENE. LE MATERIAU EST CONSTITUE D'INCLUSIONS SPHERIQUES, DE NATURE ELECTROMAGNETIQUE VARIEE, DISPERSEES DANS UNE MATRICE DIELECTRIQUE. CHAQUE INCLUSION POUVANT ETRE DU MEME ORDRE DE GRANDEUR QUE LA LONGUEUR D'ONDE, LA DIFFUSION MULTIPLE DU RAYONNEMENT INCIDENT EST CALCULEE. DE PLUS, LES EFFETS DE COHERENCE DES CHAMPS SONT PRIS EN COMPTE CAR LES CONCENTRATIONS VOLUMIQUES EN INCLUSIONS SONT SOUVENT BIEN SUPERIEURES AU POUR-CENT ET LES COUPLAGES ENTRE PARTICULES PEUVENT ALORS DEVENIR NON NEGLIGEABLES. NOUS PRESENTONS UN MODELE ANALYTIQUE MIXTE COMPOSE D'UN MODELE LOCAL, APPELE MODELE DE MULTIDIFFUSION, ET DU MODELE GLOBAL DES 4-FLUX. LE MODELE LOCAL TRAITE LA DIFFUSION MULTIPLE DEPENDANTE SUR UN ENSEMBLE DE PARTICULES. LE MODELE GLOBAL PERMET DE, DUPLIQUER A L'ECHELLE DU MATERIAU LES INFORMATIONS ELECTROMAGNETIQUES OBTENUES GRACE AU MODELE DE MULTIDIFFUSION SUR UN NOMBRE RAISONNABLE DE PARTICULES, ET DE TRAITER LES PROBLEMES AUX INTERFACES. LE MODELE MIXTE FOURNIT ALORS LES COEFFICIENTS DE REFLEXION ET DE TRANSMISSION DU MATERIAU HETEROGENE DENSE.
Book Synopsis Résolution par la méthode de Monte Carlo de formulations intégrales du problème de diffusion électromagnétique par une suspension de particules à géométries complexes by : Julien Charon
Download or read book Résolution par la méthode de Monte Carlo de formulations intégrales du problème de diffusion électromagnétique par une suspension de particules à géométries complexes written by Julien Charon and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'étude du problème de la diffusion d'une onde électromagnétique par une suspension de particules non sphériques est une difficulté récurrente dans de nombreux domaines de la recherche et de l'ingénierie. Cela implique d'utiliser des dispositifs expérimentaux hautement spécialisés ou de résoudre les équations de Maxwell, ce qui représente un véritable défi lorsque les particules sont de géométries complexes et avec des distributions statistiques de taille, d'orientation et de forme. L'objectif de la présente thèse est d'explorer l'utilisation de la méthode de Monte Carlo pour résoudre des formulations intégrales du champ électromagnétique diffusé déduites des équations de Maxwell. En particulier, nous résolvons celles de l'approximation de Schiff, de l'approximation de Born ainsi que celle du développement en série de Born. Notre approche est basée sur un travail de reformulation intégrale permettant de concevoir des algorithmes incluant les avancées les plus récentes de la méthode. Cette approche originale, utilisant les outils de la synthèse d'image pour gérer n'importe quelle géométrie, permet de traiter des statistiques de particules ainsi que d'évaluer les sensibilités à des paramètres d'intérêts, sans augmentation significative du temps de calcul. Les outils développés répondent d'ores et déjà aux besoins d'optimisation des photobioréacteurs qui mettent en œuvre des particules à faible contraste d'indice (micro-algues). À l'issue de ce travail, des pistes de recherches ont émergé pour explorer le verrou bien identifié des grandes particules et des forts contrastes d'indice à partir du principe de zéro-variance.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Book Synopsis Acoustics, Aeroacoustics and Vibrations by : Fabien Anselmet
Download or read book Acoustics, Aeroacoustics and Vibrations written by Fabien Anselmet and published by John Wiley & Sons. This book was released on 2016-01-07 with total page 529 pages. Available in PDF, EPUB and Kindle. Book excerpt: This didactic book presents the main elements of acoustics, aeroacoustics and vibrations. Illustrated with numerous concrete examples linked to solid and fluid continua, Acoustics, Aeroacoustics and Vibrations proposes a selection of applications encountered in the three fields, whether in room acoustics, transport, energy production systems or environmental problems. Theoretical approaches enable us to analyze the different processes in play. Typical results, mostly from numerical simulations, are used to illustrate the main phenomena (fluid acoustics, radiation, diffraction, vibroacoustics, etc.).
Book Synopsis Bogoliubov-de Gennes Method and Its Applications by : Jian-Xin Zhu
Download or read book Bogoliubov-de Gennes Method and Its Applications written by Jian-Xin Zhu and published by Springer. This book was released on 2016-06-21 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is to provide an elementary yet systematic description of the Bogoliubov-de Gennes (BdG) equations, their unique symmetry properties and their relation to Green’s function theory. Specifically, it introduces readers to the supercell technique for the solutions of the BdG equations, as well as other related techniques for more rapidly solving the equations in practical applications. The BdG equations are derived from a microscopic model Hamiltonian with an effective pairing interaction and fully capture the local electronic structure through self-consistent solutions via exact diagonalization. This approach has been successfully generalized to study many aspects of conventional and unconventional superconductors with inhomogeneities – including defects, disorder or the presence of a magnetic field – and becomes an even more attractive choice when the first-principles information of a typical superconductor is incorporated via the construction of a low-energy tight-binding model. Further, the lattice BdG approach is essential when theoretical results for local electronic states around such defects are compared with the scanning tunneling microscopy measurements. Altogether, these lectures provide a timely primer for graduate students and non-specialist researchers, while also offering a useful reference guide for experts in the field.
Book Synopsis Boundary-Layer Theory by : Hermann Schlichting (Deceased)
Download or read book Boundary-Layer Theory written by Hermann Schlichting (Deceased) and published by Springer. This book was released on 2016-10-04 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of the near-legendary textbook by Schlichting and revised by Gersten presents a comprehensive overview of boundary-layer theory and its application to all areas of fluid mechanics, with particular emphasis on the flow past bodies (e.g. aircraft aerodynamics). The new edition features an updated reference list and over 100 additional changes throughout the book, reflecting the latest advances on the subject.
Book Synopsis Post-Dryout Heat Transfer by : G.F. Hewitt
Download or read book Post-Dryout Heat Transfer written by G.F. Hewitt and published by Routledge. This book was released on 2017-10-06 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of post-dryout heat transfer has generated great interest because of its importance in determining maximum clad temperature in nuclear reactor loss-of-coolant accidents (LOCAs). An associated phenomenon, the deterioration of heat transfer in boiling, is significant to other industrial sectors. This book provides comprehensive coverage of post-dryout heat transfer, discussing such essential topics as post-dryout heat transfer in dispersed flow, interpretation and use of transient data in surface rewetting by reinstatement of flow or by reducing heat flux, rod bundles, two-phase flow occurrences in the post-dryout region, various methods for predicting ""inverted annular flow,"" and new experiments for measuring thermodynamic nonequilibrium with probes in the channel. The book also presents a basis for independent safety assessment of nuclear reactors and chemical plant systems where post-dryout heat transfer may occur. Post-Dryout Heat Transfer will be a useful reference for researchers and professionals in the nuclear and chemical production industries.
Book Synopsis A Parallel Finite Volume Algorithm for Large-eddy Simulation of Turbulent Flows by : Trong T. Bui
Download or read book A Parallel Finite Volume Algorithm for Large-eddy Simulation of Turbulent Flows written by Trong T. Bui and published by . This book was released on 1998 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book El Niño written by Bruno Voituriez and published by UNESCO. This book was released on 2000 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: El Nino, caprice of the heavens, scapegoat for every calamity? The general public cannot really understand what is behind the El Nino phenomenon. The book offers a tour of the Earth's climate to understand one of its normal but extreme components.
Book Synopsis The Theory of Propellers by : Theodore Theodorsen
Download or read book The Theory of Propellers written by Theodore Theodorsen and published by . This book was released on 1944 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary: A technical method is given for calculating the axial interference velocity of a propeller. The method involves the use of certain weight functions P, Q, and F. Numerical values for the weight functions are given for two-blade, three-blade, and six-blade propellers.
Book Synopsis An Introduction to Differential Manifolds by : Jacques Lafontaine
Download or read book An Introduction to Differential Manifolds written by Jacques Lafontaine and published by Springer. This book was released on 2015-07-29 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an introduction to differential manifolds. It gives solid preliminaries for more advanced topics: Riemannian manifolds, differential topology, Lie theory. It presupposes little background: the reader is only expected to master basic differential calculus, and a little point-set topology. The book covers the main topics of differential geometry: manifolds, tangent space, vector fields, differential forms, Lie groups, and a few more sophisticated topics such as de Rham cohomology, degree theory and the Gauss-Bonnet theorem for surfaces. Its ambition is to give solid foundations. In particular, the introduction of “abstract” notions such as manifolds or differential forms is motivated via questions and examples from mathematics or theoretical physics. More than 150 exercises, some of them easy and classical, some others more sophisticated, will help the beginner as well as the more expert reader. Solutions are provided for most of them. The book should be of interest to various readers: undergraduate and graduate students for a first contact to differential manifolds, mathematicians from other fields and physicists who wish to acquire some feeling about this beautiful theory. The original French text Introduction aux variétés différentielles has been a best-seller in its category in France for many years. Jacques Lafontaine was successively assistant Professor at Paris Diderot University and Professor at the University of Montpellier, where he is presently emeritus. His main research interests are Riemannian and pseudo-Riemannian geometry, including some aspects of mathematical relativity. Besides his personal research articles, he was involved in several textbooks and research monographs.
Book Synopsis Dynamic Behavior of Materials, Volume 1 by : Bo Song
Download or read book Dynamic Behavior of Materials, Volume 1 written by Bo Song and published by Springer. This book was released on 2015-10-23 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic Behavior of Materials, Volume 1 represents the first of nine volumes of technical papers presented at the Society for Experimental Mechanics SEM 15th International Congress & Exposition on Experimental and Applied Mechanics, held at Costa Mesa, California, June 8-11, 2015. The full set of proceedings also includes volumes on: Challenges in Mechanics of Time Dependent Materials, Advancement of Optical Methods in Experimental Mechanics, Experimental and Applied Mechanics 16th International Symposium on MEMS and Nanotechnology, 5th International Symposium on the Mechanics of Biological Systems and Materials, International Symposium on the Mechanics of Composite and Multi-functional Materials, Fracture, Fatigue, Failure and Damage Evolution; and Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems.
Book Synopsis Flow Sensing in Air and Water by : Horst Bleckmann
Download or read book Flow Sensing in Air and Water written by Horst Bleckmann and published by Springer Science & Business Media. This book was released on 2014-01-22 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, leading scientists in the fields of sensory biology, neuroscience, physics and engineering explore the basic operational principles and behavioral uses of flow sensing in animals and how they might be applied to engineering applications such as autonomous control of underwater or aerial vehicles. Although humans possess no flow-sensing abilities, countless aquatic (e.g. fish, cephalopods and seals), terrestrial (e.g. crickets and spiders) and aerial (e.g. bats) animals have flow sensing abilities that underlie remarkable behavioral feats. These include the ability to follow silent hydrodynamic trails long after the trailblazer has left the scene, to form hydrodynamic images of their environment in total darkness, and to swim or fly efficiently and effortlessly in the face of destabilizing currents and winds.
