Download or read book Conception et r alisation d une machine synchrone double excitation written by Daniel Fodorean and published by . This book was released on 2005 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Un nombre croissant d'industriels et d'organismes de recherche tentent de trouver des solutions technologiques innovantes permettant une meilleure gestion de l'energie. Les machines synchrones à double excitation (MSDE) sont parmi les solutions les plus intéressantes qui ne cessent d'immerger dans cette perspective. Mon travail de thèse s'inscrit dans le cadre de la conception d'une MSDE destinée a l'entrainement électromécanique direct. Une MSDE a été dimensionnée, réalisée et testée. Un rapport de gain en vitesse de 3 a été atteint ce qui est bon au regard des structures du même type actuellement publiées dans la littérature. Le travail mené s'est d'abord orienté vers l'étude bibliographique de la problématique de la thèse (le vehicule électrique), le cahier des charges dimensionnant de sa motorisation et les différentes solutions envisageables pour l'entraînement direct. L'étude comparative de ces solutions nous a justifié le choix des MSDE en général et en particulier la structure proposée : MSDE de série avec la bobine auxiliaire placée au rotor. Ensuite nous avons developpé les modèles analytiques (par réseaux de reluctances) d'une part et numérique par élément fini couplé à matlab/simulink d'autre part. Ces derniers ont été utilisés avec succès. Dans un deuxième temps nous avons voulu étudier en grandeur nature la solution proposée et cela à travers la réalisation d'un prototype de MSDE. Pour des raisons économiques nous avons juste réalisé le rotor sur mesure d'un stator que nous avons recupéré d'une machine à induction dont la puissance est 5.5kw. Les tests pratiques sont encourageants tant au niveau des paramètres physiques qu'au niveau des performances du défluxage.
Download or read book Etude et Optimisation d une Machine Synchrone Double Excitation written by Daanoune Abdeljalil and published by Presses Academiques Francophones. This book was released on 2013-01 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans un contexte ou la question de la preservation de l'environnement est devenue un sujet societal majeur, la recherche de nouvelles technologies pour remplacer la voiture a essence constitue un veritable enjeu industriel. Les vehicules hybrides et electriques sont une alternative prometteuse aux vehicules conventionnels. Ce travail porte sur la conception et l'optimisation des machines electriques pour la motorisation de ces voitures. Au cours de ces travaux, nous avons developpe une nouvelle methodologie de dimensionnement et d'optimisation des machines synchrones a double excitation. L'interet de cette methode est son bon compromis entre la precision et le temps de calcul et sa capacite d'adaptation a plusieurs types de machines. Le second volet de ce livre est consacre a la proposition d'une nouvelle structure de machine synchrone a rotor bobine. Une technique originale de compensation de la reaction magnetique d'induit est mise en place, elle consiste en l'insertion d'aimants secondaires permettant de creer un flux dans l'axe q de la machine. Ce dernier a pour role d'affaiblir le flux de la reaction magnetique d'induit.
Download or read book Contribution la conception et la commande des machines synchrones double excitation written by Yacine Amara and published by . This book was released on 2001 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les machines à double excitation sont des machines synchrones où coexistent deux circuits d'excitation, l'un à aimants permanents et l'autre bobiné. L'étude a montré que la double excitation permet d'allier les avantages des machines synchrones à inducteur bobiné à celles des machines à aimants permanents. Ce concept permet un meilleur dimensionnement de l'ensemble convertisseur-machine, et une meilleure gestion de l'énergie. Pour que les machines à aimants permanents puissent fonctionner sur une large plage de vitesse, il est nécessaire qu'elles aient une réaction magnétique d'induit du même ordre que le flux d'excitation. en contre partie, le facteur de puissance est plus faible et le convertisseur d'alimentation est surdimensionné. La double excitation permet aux machines à aimants permanents de fonctionner sur une large plage de vitesse, même si la réaction magnétique d'induit est relativement faible par rapport au flux d'excitation, tout en ayant un meilleur facteur de puissance...
Download or read book Textbooks and Quality Learning for All written by Unesco and published by UNESCO. This book was released on 2006 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focused on the dual aspects of access and quality, this publication discusses the role of textbooks in facilitating quality education for all. The book consists of reviews of the international perspectives as well as case studies on Brazil, Russian Federation, and Rwanda. It also documents strategies that could help to optimise procedures of textbook development, production, and evaluation; enhance textbooks' pedagogical impact; improve teachers' selection of textbooks; and raise textbook supply efficiently.
Download or read book Microsound written by Curtis Roads and published by National Geographic Books. This book was released on 2004-08-20 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Below the level of the musical note lies the realm of microsound, of sound particles lasting less than one-tenth of a second. Recent technological advances allow us to probe and manipulate these pinpoints of sound, dissolving the traditional building blocks of music—notes and their intervals—into a more fluid and supple medium. The sensations of point, pulse (series of points), line (tone), and surface (texture) emerge as particle density increases. Sounds coalesce, evaporate, and mutate into other sounds. Composers have used theories of microsound in computer music since the 1950s. Distinguished practitioners include Karlheinz Stockhausen and Iannis Xenakis. Today, with the increased interest in computer and electronic music, many young composers and software synthesis developers are exploring its advantages. Covering all aspects of composition with sound particles, Microsound offers composition theory, historical accounts, technical overviews, acoustical experiments, descriptions of musical works, and aesthetic reflections.
Download or read book The Development Of Large Technical Systems written by Renate Mayntz and published by Routledge. This book was released on 2019-07-11 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an outcome of the conference on the development of large technical systems held in Berlin in 1986. It focuses on the comparative analysis of the development of large technical systems, particularly electrical power, railroad, air traffic, telephone, and other forms of telecommunication.
Download or read book Relief Supply Chain Management for Disasters written by Gyongyi Kovacs and published by . This book was released on 2012 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book furthers the scholarly understanding of SCM in disaster relief, particularly establishing the central role of logistics in averting and limiting unnecessary hardships"--Provided by publisher.
Download or read book Telematic Embrace written by Roy Ascott and published by Univ of California Press. This book was released on 2003 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Telematic Embrace combines a provocative collection of writings from 1964 to the present by the preeminent artist and art theoretician Roy Ascott, with a critical essay by Edward Shanken that situates Ascott's work within a history of ideas in art, technology, and philosophy.
Download or read book Archaeological Sites written by Sharon Sullivan and published by Getty Publications. This book was released on 2012 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt: A collection of essays and reports examining key issues in conservation and management of archaeological sites. It is divided into parts that focuses on historical methods, concepts, and issues; conserving the archaeological resource; physical conservation of archaeological sites; the cultural values of archaeological sites; and site management.
Download or read book International Research on Permanent Authentic Records in Electronic Systems InterPARES 2 written by and published by . This book was released on 2005 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The information provided on [the] disk is intended to complement the Project's book, International Research on Permanent Authentic Records in Electronic Systems (InterPARES) 2: Experiential, Interactive and Dynamic Records, by providing quick and easy access to much of the supporting documentation and underlying data and analyses that were used to inform the research and the findings presented in the book." -- DVD menu.
Download or read book French Book plates written by Walter Hamilton and published by . This book was released on 1892 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mapping Cyberspace written by Martin Dodge and published by Routledge. This book was released on 2003-09-02 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mapping Cyberspace is a ground-breaking geographic exploration and critical reading of cyberspace, and information and communication technologies. The book: * provides an understanding of what cyberspace looks like and the social interactions that occur there * explores the impacts of cyberspace, and information and communication technologies, on cultural, political and economic relations * charts the spatial forms of virutal spaces * details empirical research and examines a wide variety of maps and spatialisations of cyberspace and the information society * has a related website at http://www.MappingCyberspace.com. This book will be a valuable addition to the growing body of literature on cyberspace and what it means for the future.
Download or read book The World Republic of Letters written by Pascale Casanova and published by Harvard University Press. This book was released on 2004 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: The "world of letters" has always seemed a matter more of metaphor than of global reality. In this book, Pascale Casanova shows us the state of world literature behind the stylistic refinements--a world of letters relatively independent from economic and political realms, and in which language systems, aesthetic orders, and genres struggle for dominance. Rejecting facile talk of globalization, with its suggestion of a happy literary "melting pot," Casanova exposes an emerging regime of inequality in the world of letters, where minor languages and literatures are subject to the invisible but implacable violence of their dominant counterparts. Inspired by the writings of Fernand Braudel and Pierre Bourdieu, this ambitious book develops the first systematic model for understanding the production, circulation, and valuing of literature worldwide. Casanova proposes a baseline from which we might measure the newness and modernity of the world of letters--the literary equivalent of the meridian at Greenwich. She argues for the importance of literary capital and its role in giving value and legitimacy to nations in their incessant struggle for international power. Within her overarching theory, Casanova locates three main periods in the genesis of world literature--Latin, French, and German--and closely examines three towering figures in the world republic of letters--Kafka, Joyce, and Faulkner. Her work provides a rich and surprising view of the political struggles of our modern world--one framed by sites of publication, circulation, translation, and efforts at literary annexation.
Download or read book Two Centuries of Experience in Water Resources Management written by John Lonnquest and published by Government Printing Office. This book was released on 2015-03-20 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Harrod s Librarians Glossary and Reference Book written by Ray Prytherch and published by Routledge. This book was released on 2016-04-15 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: Listing over 10,000 entries, Harrod's Librarians' Glossary and Reference Book spans everything from traditional printing terms to search engines and from book formats to URLs. Revisions for this tenth edition have centred in particular on the Information Society and its ramifications, on the general shift towards electronic resources, and on e-commerce, e-learning and e-government, whilst at the same time maintaining key areas predating the IT revolution. Web terminology, URLs and IT terms have been checked and updated, and coverage of terms relating to digitization and digital resources, portals, multimedia and electronic products has been revised or expanded as necessary. Harrod's Glossary now includes Knowledge Management terms, and this edition has also focused on developments in the field of intellectual property, copyright, patents, privacy and piracy. It gives wide international coverage of names, addresses and URLs of major libraries and other important organizations in the information sector, of professional associations, fellowships, networks, government bodies, projects and programmes, consortia and institutions, influential reports and other key publications. Entries are included on classification and file coding, on records management and archiving and on both the latest and the most enduring aspects of library and information skills. Even with the Web at your fingertips Harrod's Librarians' Glossary and Reference Book remains a quicker reference for explaining specialist terms, jargon and acronyms, and for finding the URLs you need, whether you are working in a print-based or digital library, in archiving, records management, conservation, bookselling or publishing.
Download or read book What Is Global History written by Sebastian Conrad and published by Princeton University Press. This book was released on 2017-08-29 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive overview of the innovative new discipline of global history Until very recently, historians have looked at the past with the tools of the nineteenth century. But globalization has fundamentally altered our ways of knowing, and it is no longer possible to study nations in isolation or to understand world history as emanating from the West. This book reveals why the discipline of global history has emerged as the most dynamic and innovative field in history—one that takes the connectedness of the world as its point of departure, and that poses a fundamental challenge to the premises and methods of history as we know it. What Is Global History? provides a comprehensive overview of this exciting new approach to history. The book addresses some of the biggest questions the discipline will face in the twenty-first century: How does global history differ from other interpretations of world history? How do we write a global history that is not Eurocentric yet does not fall into the trap of creating new centrisms? How can historians compare different societies and establish compatibility across space? What are the politics of global history? This in-depth and accessible book also explores the limits of the new paradigm and even its dangers, the question of whom global history should be written for, and much more. Written by a leading expert in the field, What Is Global History? shows how, by understanding the world's past as an integrated whole, historians can remap the terrain of their discipline for our globalized present.
Download or read book Conservation Regeneration the Modernist Neighbourhood written by and published by . This book was released on 2012 with total page 807 pages. Available in PDF, EPUB and Kindle. Book excerpt:
