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Book Description
CE MEMOIRE TRAITE DE LA MESURE DES PROPRIETES MAGNETIQUES DES TOLES UTILISEES EN CONSTRUCTION ELECTRIQUE, QUAND ELLES SONT SOUMISES A UN CHAMP D'EXCITATION TOURNANT. NOUS AVONS MIS AU POINT AU BANC DE CARACTERISATION DES TOLES MAGNETIQUES, QUI A PERMIS D'ETUDIER L'AIMANTATION ET LES PERTES EN CHAMP TOURNANT MAIS AUSSI EN CHAMP UNIDIRECTIONNEL D'ORIENTATION QUELCONQUE DANS LE PLAN DE LA TOLE. DIFFERENTES QUALITES DE MATERIAUX ONT ETE MESUREES ET UNE ETUDE COMPARATIVE DES PERTES EN CHAMP TOURNANT ET EN CHAMP UNIAXIAL A ETE EGALEMENT MENEE. LES RESULTATS OBTENUS PERMETTENT D'INTERPRETER LE COMPORTEMENT DES MATERIAUX MAGNETIQUES EN CHAMP TOURNANT ET D'AMELIORER NOS CONNAISSANCES DE MECANISMES PHYSIQUES MIS EN JEU
Book Description
CE MEMOIRE TRAITE DE LA MESURE DES PROPRIETES MAGNETIQUES DES TOLES UTILISEES EN CONSTRUCTION ELECTRIQUE, QUAND ELLES SONT SOUMISES A UN CHAMP D'EXCITATION TOURNANT. NOUS AVONS MIS AU POINT AU BANC DE CARACTERISATION DES TOLES MAGNETIQUES, QUI A PERMIS D'ETUDIER L'AIMANTATION ET LES PERTES EN CHAMP TOURNANT MAIS AUSSI EN CHAMP UNIDIRECTIONNEL D'ORIENTATION QUELCONQUE DANS LE PLAN DE LA TOLE. DIFFERENTES QUALITES DE MATERIAUX ONT ETE MESUREES ET UNE ETUDE COMPARATIVE DES PERTES EN CHAMP TOURNANT ET EN CHAMP UNIAXIAL A ETE EGALEMENT MENEE. LES RESULTATS OBTENUS PERMETTENT D'INTERPRETER LE COMPORTEMENT DES MATERIAUX MAGNETIQUES EN CHAMP TOURNANT ET D'AMELIORER NOS CONNAISSANCES DE MECANISMES PHYSIQUES MIS EN JEU
Book Description
CE MEMOIRE EST CONSACRE A L'ETUDE DES PERTES FER, EN CHAMP MAGNETIQUE TOURNANT, DANS DES TOLES SOUMISES A UNE ONDE D'ENTREFER PROGRESSIVE A REPARTITION TRAPEZOIDALE. POUR CE FAIRE, NOUS AVONS MIS AU POINT UN NOUVEAU DISPOSITIF DE MESURES DE PERTES FER. CELUI-CI PERMET DE TESTER DES TOLES CIRCULAIRES DE FORME ANNULAIRE LISSE OU ENCOCHEE ET LES DISPOSE DANS UN ENVIRONNEMENT MAGNETIQUE PROCHE DES CONDITIONS REELLES DE FONCTIONNEMENT, RENCONTREES DANS LES MACHINES ELECTRIQUES TOURNANTES. ON MESURE LES PERTES FER PAR UNE METHODE DE COUPLE. CELLE-CI CONSISTE A APPLIQUER UN CHAMP MAGNETIQUE TOURNANT A L'ECHANTILLON DE TOLES SOUS TEST ET A MESURER L'INTERACTION ENTRE CE CHAMP ET L'AIMANTATION DU MATERIAU. NOUS AVONS MESURE LES PERTES FER, DANS DES TOLES FER-3%SILICIUM ET ACIER, EN FONCTION DE PARAMETRES ELECTROMAGNETIQUES ET GEOMETRIQUES. L'ENSEMBLE DE CES RESULTATS EXPERIMENTAUX A PERMIS DE METTRE EN EVIDENCE L'INFLUENCE DES CES PARAMETRES SUR L'EVOLUTION DES PERTES FER, POUR LES DIFFERENTES TOLES TESTEES. A PARTIR DE CES RESULTATS EXPERIMENTAUX, NOUS AVONS MODELISE L'EVOLUTION DES PERTES FER EN FONCTION DES PARAMETRES DE MESURES. LA FORMULATION GLOBALE DES PERTES POUR LES DEUX TYPES DE TOLES DE FORME LISSE NE DIFFERE QUE PAR LA VALEUR DE LEURS COEFFICIENTS. POUR LES TOLES FER-3%SILICIUM DE FORME ENCOCHEE, LE MODELE EST DIFFERENT DE CELUI ELABORE POUR LA MEME TOLE DE FORME LISSE. CE QUI CONFIRME QUE CHACUNE D'ELLE CONSTITUE UN SYSTEME ELECTROMAGNETIQUE DIFFERENT. CETTE PREMIERE EXPLOITATION DU BANC DE MESURES OFFRE PLUSIEURS PERSPECTIVES. PARMI CELLES-CI, NOUS PROPOSONS L'ETUDE DE L'INFLUENCE, SUR LES PERTES FER DANS LES TOLES, DE LA FORME DE LEUR ENCOCHAGE, DE LEUR PRESSION D'ASSEMBLAGE, ET DE LA FORME D'ONDE D'ENTREFER
Book Description
DANS UN PREMIER TEMPS, NOUS AVONS ETABLI UNE METHODE DE PREDETERMINATION DE PERTES DANS LES MACHINES ELECTRIQUES EN SE BASANT SUR LES METHODES NUMERIQUES CLASSIQUEMENT UTILISEES. L'ORDRE DE GRANDEUR DE L'ECART ENTRE LES RESULTATS DE NOTRE PREDETERMINATION EST D'ENVIRON 30% PAR RAPPORT AUX PERTES REELLES. CET ECART EST DU A DES SOURCES DE PERTES SUPPLEMENTAIRES DONT ON N'A PAS TENU COMPTE DANS LES CALCULS. PARMI CES SOURCES DE PERTES NOUS AVONS CHOISI D'ETUDIER L'INFLUENCE DE L'HETEROGENEITE DE L'INDUCTION SUR LES PERTES. DANS UNE DEUXIEME PARTIE, NOUS AVONS MODELISE UNE TOLE MAGNETIQUE SOUMIS A UN GRADIENT D'INDUCTION A L'AIDE D'UN LOGICIEL DE CALCUL DE CHAMP. LA STRUCTURE GEOMETRIQUE D'UNE MACHINE ETANT COMPLEXE, UN ECHANTILLON DE FORME TRAPEZOIDALE EST CHOISIE. CETTE ETUDE A MONTRE QUE LA CONTRIBUTION DE L'EFFET DE FORME DE L'ECHANTILLON SUR LES PERTES PEUT ATTEINDRE 15% DES PERTES TOTALES. ENFIN, DANS LA DERNIERE PARTIE, NOUS AVONS ESSAYE DE METTRE AU POINT DISPOSITIF DE CARACTERISATION D'UNE TOLE SOUMISE A UN GRADIENT D'INDUCTION. CETTE ETUDE A PERMIS DE SOULEVER CERTAINS NOMBRES DE PROBLEMES SUR LE CHOIX DES CAPTEURS ET LA PREPARATION DE L'ECHANTILLON. NOUS AVONS AUSSI PREDETERMINE LES CARACTERISTIQUES MAGNETIQUES DE L'ECHANTILLON DE FORME TRAPEZOIDALE A PARTIR DES CARACTERISTIQUES MAGNETIQUES DES TOLES STANDARDS
Author: Claude Cohen-Tannoudji Publisher: John Wiley & Sons ISBN: 3527345558 Category : Science Languages : en Pages : 790
Book Description
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.
Author: Jacqueline Ki-Zerbo Publisher: Univ of California Press ISBN: 9780520066960 Category : History Languages : en Pages : 372
Book Description
"This volume covers the period from the end of the Neolithic era to the beginning of the seventh century of our era. This lengthy period includes the civilization of Ancient Egypt, the history of Nubia, Ethiopia, North Africa and the Sahara, as well as of the other regions of the continent and its islands."--Publisher's description
Author: Jacques Lafontaine Publisher: Springer ISBN: 3319207350 Category : Mathematics Languages : en Pages : 408
Book Description
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.
Author: P. M. Banks Publisher: Elsevier ISBN: 1483260666 Category : Science Languages : en Pages : 445
Book Description
Aeronomy, Part A is an attempt to make a comprehensive exposition of the processes in aeronomy, the study of composition, movement, and thermal balance of the upper regions of the planetary atmosphere. The text covers topics such as atmospheric regions and atmospheric density, the temperature and molecular mass of the atmosphere; the permanent constituents and the molecular and isotonic composition of the homosphere; and the transition from the homosphere to the heterosphere. Also covered are topics such as the temperature gradient and energies in the thermosphere, conditions at 200km and above 250km, solar radiation and ionization, and aeronomic reactions. The book is recommended for scientists, especially natural physicists, who would like to know more about the field of aeronomy and its advances.
Author: Salah-Eddine Zouzou
Author: Salah-Eddine Zouzou
Author: Rafik Aouli
Author: 
Author: JEAN-LUC.. ANDRIAMIFIDY
Author: Elisabeth Ribes
Author: comte Th Du Moncel
Author: Claude Cohen-Tannoudji
Author: Jacqueline Ki-Zerbo
Author: Jacques Lafontaine
Author: P. M. Banks