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Contribution A Letude De Levolution Du Comportement Des Materiaux Magnetiques Au Cours De La Mise En Uvre Dans Une Machine Electrique Tournante
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Book Synopsis CONTRIBUTION A L'ETUDE DE L'EVOLUTION DU COMPORTEMENT DES MATERIAUX MAGNETIQUES AU COURS DE LA MISE EN UVRE DANS UNE MACHINE ELECTRIQUE TOURNANTE by : SANDRINE.. DEFOUG
Download or read book CONTRIBUTION A L'ETUDE DE L'EVOLUTION DU COMPORTEMENT DES MATERIAUX MAGNETIQUES AU COURS DE LA MISE EN UVRE DANS UNE MACHINE ELECTRIQUE TOURNANTE written by SANDRINE.. DEFOUG and published by . This book was released on 1995 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'ETUDE DU FACTEUR DE CONSTRUCTION (RAPPORT ENTRE LES PERTES DU SYSTEME ASSEMBLE ET CELLES DE LA TOLE SEULE) MONTRE CLAIREMENT QUE LES ACTIONS MECANIQUES D'ASSEMBLAGE DES TOLES DANS UN MOTEUR DEGRADENT LEURS QUALITES MAGNETIQUES. TOUTEFOIS LA CAUSE PRECISE DE CETTE DETERIORATION RESTE MAL CONNUE. DANS CETTE RECHERCHE, L'APPROCHE QUE NOUS PROPOSONS EST DE TYPE CAUSALE, DANS LE SENS OU NOUS CHERCHONS A APPREHENDER LES PHENOMENES PHYSIQUES PRESENTS AU NIVEAU DE L'AIMANTATION LOCALE LORS DE L'APPLICATION D'UNE CONTRAINTE MECANIQUE. TOUT D'ABORD, NOUS AVONS MIS EN UVRE UN BANC EXPERIMENTAL, A EFFET KERR MAGNETO-OPTIQUE, QUI A PERMIS, POUR LA PREMIERE FOIS, D'APRES L'ETUDE BIBLIOGRAPHIQUE, LA VISUALISATION DES DOMAINES MAGNETIQUES REGULIERS SUR LES TOLES DE FER-SILICIUM A GRAINS NON-ORIENTES. PUIS, NOUS AVONS ELABORE UNE METHODOLOGIE DE DETERMINATION DE LA DIRECTION DE L'AIMANTATION DANS LES DIVERS DOMAINES, SIMPLE A UTILISER. CETTE METHODOLOGIE A ETE VALIDEE SUR DES EXEMPLES CONNUS DE CONFIGURATIONS MAGNETIQUES ET A PERMIS LA CONNAISSANCE DE LA DIRECTION DE L'AIMANTATION SUR DES STRUCTURES QUE LES RAISONNEMENTS PHYSIQUES CLASSIQUES NE PARVIENNENT PAS A EXPLIQUER. LEUR ANALYSE PEUT PERMETTRE, COMME NOUS L'AVONS ABORDE, LA COMPREHENSION DE L'ORGANISATION DES DOMAINES DANS LE VOLUME DE LA TOLE. ENFIN, UN ESSAI D'APPLICATION DE CETTE METHODOLOGIE A L'ETUDE DE L'INFLUENCE DES CONTRAINTES MECANIQUES SUR LES PROPRIETES MAGNETIQUES DES TOLES A ETE REALISE. POUR CE TYPE DE TRAVAIL NOTRE METHODOLOGIE OFFRE UN OUTIL DE QUANTIFICATION PRATIQUE ET FIABLE. LA VOIE EST DONC OUVERTE POUR LA RECHERCHE DE CORRELATIONS ENTRE LES CONTRAINTES APPLIQUEES AU MATERIAU ET LA DEFORMATION DES DOMAINES MAGNETIQUES ENGENDREE
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1995 with total page 1396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis AUTOMATISATION DE BANCS DE CARACTERISATION 2D DE TOLES MAGNETIQUES. INFLUENCE DES FORMES D'ONDE SUR LES MECANISMES D'AIMANTATION by : AUREL SORIN.. SPORNIC
Download or read book AUTOMATISATION DE BANCS DE CARACTERISATION 2D DE TOLES MAGNETIQUES. INFLUENCE DES FORMES D'ONDE SUR LES MECANISMES D'AIMANTATION written by AUREL SORIN.. SPORNIC and published by . This book was released on 1998 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOTRE THESE PORTE SUR LE COMPORTEMENT DES MATERIAUX MAGNETIQUES DOUX SOUMIS A DES VARIATIONS 2D QUELCONQUES DU VECTEUR INDUCTION MAGNETIQUE DANS LE PLAN DE LA TOLE. DE TELLES CONDITIONS EXISTENT PAR EXEMPLE DANS LES MACHINES ELECTRIQUES TOURNANTES OU LES TRANSFORMATEURS TRIPHASES. LES TRAVAUX PRECEDENTS ONT UTILISE DES FORMES D'ONDE SIMPLIFIEES DE L'INDUCTION : CIRCULAIRE OU ELLIPTIQUE PARCOURUES A VITESSE ANGULAIRE CONSTANTE. UN OUTIL DE CARACTERISATION MAGNETIQUE COMPLETE EN 2D A DU ETRE TOUT D'ABORD ELABORE. NOUS AVONS DEVELOPPE POUR LES DEUX DISPOSITIFS DE MESURE EN CHAMP TOURNANT RSST DU LEG UN SYSTEME DE PILOTAGE INFORMATISE ET AUTOMATIQUE. LA REALISATION D'UN ASSERVISSEMENT NUMERIQUE A PERMIS D'AMELIORER NETTEMENT LA PRECISION ET LA STABILITE DES MESURES, TOUT EN ELARGISSANT L'INTERVALLE DES FREQUENCES. IL A PERMIS AUSSI L'OBTENTION POUR LA PREMIERE FOIS DE FORMES D'ONDE 2D COMPLEXES DE L'INDUCTION. CET OUTIL NOUS PERMIS L'ETUDE DE PLUSIEURS MATERIAUX MAGNETIQUES DOUX, PRESENTANT DES CARACTERISTIQUES PHYSIQUES ET DES TEXTURES DIFFERENTES : FENI, FECO, FESI NO. - D'ABORD CES TROIS MATERIAUX ONT ETE SOUMIS A DES INDUCTIONS CIRCULAIRES. NOUS AVONS ETUDIE LEURS COMPORTEMENTS SCALAIRES ET VECTORIELS, DYNAMIQUES ET REVERSIBLES. L'INFLUENCE DE LA FREQUENCE ET DE L'ANISOTROPIE DU MATERIAU A ETE AINSI ANALYSEE. LES MODELES DE REPRESENTATION DES PERTES ET DE LA LOI VECTORIELLE B(H) ONT ETE APPLIQUES ET DISCUTES. NOUS AVONS EN PARTICULIER PROPOSE UNE ANALYSE VECTORIELLE ORIGINALE DE LA TEXTURE CUBIQUE. - ENSUITE NOUS AVONS MIS EN EVIDENCE L'IMPORTANCE DES FORMES D'ONDE SUR LE COMPORTEMENT 2D DU MATERIAU EN REPRODUISANT LES CONDITIONS REELLES DE FONCTIONNEMENT DANS UN MOTEUR ASYNCHRONE TRIPHASE. NOUS AVONS TESTE ET DISCUTE LA VALIDITE D'UN MODELE DE CALCUL APPROCHE PAR LES PERTES. FINALEMENT, NOUS AVONS MIS EN EVIDENCE L'IMPORTANCE DE LA DERIVEE TEMPORELLE DU VECTEUR INDUCTION SUR LE COMPORTEMENT VECTORIEL ET SUR LES PERTES MAGNETIQUES ENGENDREES.
Book Synopsis Modélisation stochastique de la variabilité des propriétés magnétiques des matériaux ferromagnétiques by : Rindra Ramarotafika
Download or read book Modélisation stochastique de la variabilité des propriétés magnétiques des matériaux ferromagnétiques written by Rindra Ramarotafika and published by . This book was released on 2012 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans le domaine du génie électrique, plusieurs travaux de recherche portent sur l'étude de l'impact des procédés de fabrication sur les propriétés magnétiques des matériaux ferromagnétiques. Cet impact se traduit par une détérioration de la perméabilité magnétique, et une augmentation des pertes, principalement des pertes par hystérésis. Il faut noter toutefois que ces études sont, pour la plupart, purement quantitatives et les travaux traitant de la modélisation des ces influences sur la loi de comportement et les pertes sont assez rares. En outre, la non répétabilité des procédés de fabrication induit souvent une variabilité sur les caractéristiques des matériaux magnétiques. Ce phénomène peut être attribué, entre autre, à un phénomène d'usure ou de vieillissement des différents outils utilisés sur la chaîne de fabrication. Le travail présenté propose une approche de type probabiliste, pour l'étude de l'impact des procédés de fabrication sur deux groupes d'échantillons de stators de machines électriques. Les deux groupes, fabriqués à partir de tôles de même grade (M800-50A), sont de mêmes dimensions et diffèrent par leur procédé de fabrication : le premier est issu d'un enroulement d'une bande de tôle poinçonnée et l'autre d'un empilement de tôles découpées au laser. La mise en œuvre des outils de la statistique a permis d'observer que les échantillons fabriqués à partir d'empilement de tôles sont plus performants magnétiquement. En outre, la variabilité des propriétés magnétiques des échantillons fabriqués à partir de tôles enroulées a été mise en évidence. Un modèle probabiliste de la loi de comportement, des pertes et de l'hystérésis magnétique, prenant en compte cette variabilité, a alors été développé. Ces modèles ont ensuite été validés à partir des données expérimentales et des tests statistiques.
Book Synopsis Quantum Mechanics, Volume 3 by : Claude Cohen-Tannoudji
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.
Author :International Atomic Energy Agency Publisher :International Atomic Energy Agency ISBN 13 :9789201063205 Total Pages :72 pages Book Rating :4.0/5 (632 download)
Book Synopsis In-Vessel Melt Retention and Ex-Vessel Corium Cooling: IAEA Tecdoc No. 1906 by : International Atomic Energy Agency
Download or read book In-Vessel Melt Retention and Ex-Vessel Corium Cooling: IAEA Tecdoc No. 1906 written by International Atomic Energy Agency and published by International Atomic Energy Agency. This book was released on 2020-08-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Author :North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Flight Vehicle Integration Panel. Symposium Publisher : ISBN 13 : Total Pages :402 pages Book Rating :4.E/5 ( download)
Book Synopsis Advances in Rotorcraft Technology by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Flight Vehicle Integration Panel. Symposium
Download or read book Advances in Rotorcraft Technology written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Flight Vehicle Integration Panel. Symposium and published by . This book was released on 1997 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Glowworm Swarm Optimization by : Krishnanand N. Kaipa
Download or read book Glowworm Swarm Optimization written by Krishnanand N. Kaipa and published by Springer. This book was released on 2017-01-10 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive account of the glowworm swarm optimization (GSO) algorithm, including details of the underlying ideas, theoretical foundations, algorithm development, various applications, and MATLAB programs for the basic GSO algorithm. It also discusses several research problems at different levels of sophistication that can be attempted by interested researchers. The generality of the GSO algorithm is evident in its application to diverse problems ranging from optimization to robotics. Examples include computation of multiple optima, annual crop planning, cooperative exploration, distributed search, multiple source localization, contaminant boundary mapping, wireless sensor networks, clustering, knapsack, numerical integration, solving fixed point equations, solving systems of nonlinear equations, and engineering design optimization. The book is a valuable resource for researchers as well as graduate and undergraduate students in the area of swarm intelligence and computational intelligence and working on these topics.
Book Synopsis Flexoelectricity in Liquid Crystals by : Agnes Buka
Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Book Synopsis The Story of Crass by : George Berger
Download or read book The Story of Crass written by George Berger and published by . This book was released on 2009 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: In-depth interviews with the main movers in the punk rock movement--Crass members Penny Rimbaud, Gee Vaucher, and Steve Ignorant--detail the face of the revolution founded by these radical thinkers and artists. When punk ruled the waves, Crass waived the rules by putting out their own records, films, and magazines and setting up a series of situationist pranks that were dutifully covered by the world's press. Not just another iconoclastic band, Crass was a musical, social, and political phenomenon: commune dwellers that were rarely photographed and remained contemptuous of conventional pop stardom. As detailed in this history, their members explored and finally exhausted the possibilities of punk-led anarchy. This definitive biography of the band not only gives backstage access to their lives, philosophies, and the movement that followed, but also to never-before-seen photographs and rare dialogues.
Book Synopsis Minerals, Critical Minerals, and the U.S. Economy by : National Research Council
Download or read book Minerals, Critical Minerals, and the U.S. Economy written by National Research Council and published by National Academies Press. This book was released on 2008-03-11 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: Minerals are part of virtually every product we use. Common examples include copper used in electrical wiring and titanium used to make airplane frames and paint pigments. The Information Age has ushered in a number of new mineral uses in a number of products including cell phones (e.g., tantalum) and liquid crystal displays (e.g., indium). For some minerals, such as the platinum group metals used to make cataytic converters in cars, there is no substitute. If the supply of any given mineral were to become restricted, consumers and sectors of the U.S. economy could be significantly affected. Risks to minerals supplies can include a sudden increase in demand or the possibility that natural ores can be exhausted or become too difficult to extract. Minerals are more vulnerable to supply restrictions if they come from a limited number of mines, mining companies, or nations. Baseline information on minerals is currently collected at the federal level, but no established methodology has existed to identify potentially critical minerals. This book develops such a methodology and suggests an enhanced federal initiative to collect and analyze the additional data needed to support this type of tool.
Book Synopsis X-Ray and Neutron Reflectivity: Principles and Applications by : Jean Daillant
Download or read book X-Ray and Neutron Reflectivity: Principles and Applications written by Jean Daillant and published by Springer Science & Business Media. This book was released on 2003-07-01 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reflection of and neutrons from surfaces has existed as an x-rays exp- imental for almost it is in the last technique fifty Nevertheless, only years. decade that these methods have become as of enormously popular probes This the surfaces and interfaces. to be due to of several appears convergence of intense different circumstances. These include the more n- availability be measured orders tron and sources that can over (so reflectivity x-ray many of and the much weaker surface diffuse can now also be magnitude scattering of thin films and studied in some the detail); growing importance multil- basic the realization of the ers in both and technology research; important which in the of surfaces and and role roughness plays properties interfaces; the of statistical models to characterize the of finally development topology its and its characterization from on roughness, dependence growth processes The of and to surface scattering experiments. ability x-rays neutro4s study four five orders of in scale of surfaces over to magnitude length regardless their and also their to ability probe environment, temperature, pressure, etc. , makes these the choice for buried interfaces often probes preferred obtaining information about the microstructure of often in statistical a global surfaces, the local This is manner to complementary imaging microscopy techniques, of such studies in the literature witnessed the veritable by explosion published the last few Thus these lectures will useful for over a resource years.
Download or read book Plant Ecology written by Unesco and published by . This book was released on 1955 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metal Recycling written by and published by UN. This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal recycling is a complex business that is becoming increasingly difficult! Recycling started long ago, when people realized that it was more resource- and cost-efficient than just throwing away the resources and starting all over again. In this report, we discuss how to increase metal-recycling rates - and thus resource efficiency - from both quantity and quality viewpoints. The discussion is based on data about recycling input, and the technological infrastructure and worldwide economic realities of recycling. Decision-makers set increasingly ambitious targets for recycling, but far too much valuable metal today is lost because of the imperfect collection of end-of-life (EoL) products, improper practices, or structural deficiencies within the recycling chain, which hinder achieving our goals of high resource efficiency and resource security, and of better recycling rates.
Book Synopsis Principles of Radar and Sonar Signal Processing by : Chevalier François Le
Download or read book Principles of Radar and Sonar Signal Processing written by Chevalier François Le and published by Artech House. This book was released on 2002 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simplexity written by Alain Berthoz and published by Odile Jacob. This book was released on 2018-12-20 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: “Simplexity, as I understand it, is the range of solutions living organisms have found, despite the complexity of natural processes, to enable the brain to prepare an action and plan for the consequences of it. These solutions are simplifying principles that enable the processing of information or situations, by taking into account past experience and anticipating the future. They are neither caricatures, shortcuts, or summaries. They are new ways of asking questions, sometimes at the cost of occasional detours, in order to achieve faster, more elegant, more effective actions.” A. B. As Alain Berthoz demonstrates in this profoundly original book, simplicity is never easy; it requires suppressing, selecting, connecting, thinking, in order to then act in the best way possible. And what if we, in turn, are inspired by the living world to process the complexity that surrounds us? Alain Berthoz is professor at the Collège de France where he is co-director of the Laboratoire de physiologie de la perception et de l’action. [Laboratory for the physiology of perception and action]. He is a member of the French Academy of Sciences, and is the author of Le Sens du mouvement [The Brain's Sense of Movement] and La Décision [Emotion and Reason].
