Download or read book Contribution l tude des perturbations conduites dans les cha nes de traction ferroviaire written by Marius Iordache and published by . This book was released on 2002 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans l'exploitation des chemins de fer, la sécurité du trafic repose sur le système de signalisation et de surveillance automatique des trains. Dans certains cas de figure le système de signalisation peut être la victime des perturbations électromagnétiques générées par les engins de traction. Le couplage entre le système de signalisation et l'engin est très fort, car les deux utilisent les rails comme support pour les transferts d'énergie et d'information. D'où la possibilité d'interférence entre les signaux du système de détection des trains et les harmoniques du courant de traction. Le but de cette thèse est de contribuer au travail de conception d'un engin de traction, en donnant des outils nécessaires à la prévision de ses niveaux d'harmoniques, dès la phase de conception. Dans le premier chapitre sont énoncés les principaux composants d'un système ferroviaire, avec une description détaillée du fonctionnement de la signalisation, et les éventuels problèmes de compatibilité électromagnétique. Le deuxième chapitre est consacré à la description de topologies des chaînes de conversion d'énergie, destinées à la traction et utilisées actuellement chez ALSTOM. Dans le troisième chapitre est abordé le calcul des spectres générés par chaque convertisseur statique faisant partie des topologies décrites au chapitre deux. La méthode de modélisation choisie est illustrée à l'aide de deux applications. Le quatrième chapitre aborde le phénomène d'interaction entre les convertisseurs et le processus de génération d'harmoniques qui en découle. Le calcul et l'évolution du spectre du courant absorbé par deux onduleurs connectés en parallèle montre le phénomène de couplage entre convertisseurs. Un formalisme général de résolution de systèmes "multi-convertisseurs" dans le domaine fréquentiel est conçu et illustré par deux exemples. Deux systèmes de convertisseurs statiques utilisées en traction ferroviaire sont résolus numériquement à l'aide d'une méthode itérative de type Newton.
Download or read book Africa from the Sixteenth to the Eighteenth Century written by Bethwell A. Ogot and published by Univ of California Press. This book was released on 1992 with total page 1088 pages. Available in PDF, EPUB and Kindle. Book excerpt: The result of years of work by scholars from all over the world, The UNESCO General History of Africa reflects how the different peoples of Africa view their civilizations and shows the historical relationships between the various parts of the continent. Historical connections with other continents demonstrate Africa's contribution to the development of human civilization. Each volume is lavishly illustrated and contains a comprehensive bibliography. This fifth volume of the acclaimed series covers the history of the continent from the beginning of the sixteenth century to the close of the eighteenth century in which two themes emerge: first, the continuing internal evolution of the states and cultures of Africa during this period second, the increasing involvement of Africa in external trade--with major but unforeseen consequences for the whole world. In North Africa, we see the Ottomans conquer Egypt. South of the Sahara, some of the larger, older states collapse, and new power bases emerge. Traditional religions continue to coexist with both Christianity (suffering setbacks) and Islam (in the ascendancy). Along the coast, particularly of West Africa, Europeans establish a trading network which, with the development of New World plantation agriculture, becomes the focus of the international slave trade. The immediate consequences of this trade for Africa are explored, and it is argued that the long-term global consequences include the foundation of the present world-economy with all its built-in inequalities.
Download or read book Africa Since 1935 written by Unesco. International Scientific Committee for the Drafting of a General History of Africa and published by Univ of California Press. This book was released on 1999 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hardcover edition of volume 8 was published in 1994. This paperback edition is the eighth and final volume to be published in the UNESCO General History of Africa. Volume 8 examines the period from 1935 to the present, and details the role of African states in the Second World War and the rise of postwar Africa. This is one of the most important books in the entire series, and as such, it is an unabridged paperback.
Download or read book UNESCO General History of Africa Vol I Abridged Edition written by Jacqueline Ki-Zerbo and published by Univ of California Press. This book was released on 1990 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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
Download or read book Energy Technology Perspectives 2010 written by International Energy Agency and published by Organization for Economic Co-Operation & Development. This book was released on 2010 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2010 edition of Energy Technology Perspectives examines the extent to which an energy technology revolution is taking place, the key technologies that are emerging, the costs and benefits of these technologies, and policies needed to foster their use. ETP 2010 presents updated scenarios from the present to 2050 that show which new technologies will be most important in key sectors and in different regions of the world. It highlights the importance of finance to achieve change, examines the implications of the scenarios for energy security and looks at how to accelerate the deployment of low-carbon technologies in major developing countries. It presents roadmaps and transition pathways for spurring deployment of the most important clean technologies and for overcoming existing barriers. With extensive data, projections and analysis, Energy Technology Perspectives 2010 provides decision makers with the detailed information and insights needed to accelerate the switch to a more secure, low-carbon energy future.
Download or read book Protected Area Management written by Barbara Sladonja and published by BoD – Books on Demand. This book was released on 2012-08-08 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Protected areas are at the base of the most national and international conservation strategies. Due to the many unpredictable elements in ecology matters, each protected area requires a case-specific set of guidelines but a common issue is how to cope with human interaction. The management of protected areas is replete with challenges and the only way to gain understanding and achieve greater management possibilities is to exchange experiences and knowledge. Environmental managers are aware of that and together with scientists are looking for more modern and better solutions, both with respect to natural resources and human interactions in many issues regarding nature protection. This publication presents reviews and research results on protected areas management, as well as 12 case studies derived from around the world with the aim of improving management effectiveness of the protected areas.
Download or read book Building Wireless Community Networks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building Wireless Community Networks is about getting people online using wireless network technology. The 802.11b standard (also known as WiFi) makes it possible to network towns, schools, neighborhoods, small business, and almost any kind of organization. All that's required is a willingness to cooperate and share resources. The first edition of this book helped thousands of people engage in community networking activities. At the time, it was impossible to predict how quickly and thoroughly WiFi would penetrate the marketplace. Today, with WiFi-enabled computers almost as common as Ethernet, it makes even more sense to take the next step and network your community using nothing but freely available radio spectrum. This book has showed many people how to make their network available, even from the park bench, how to extend high-speed Internet access into the many areas not served by DSL and cable providers, and how to build working communities and a shared though intangible network. All that's required to create an access point for high-speed Internet connection is a gateway or base station. Once that is set up, any computer with a wireless card can log onto the network and share its resources. Rob Flickenger built such a network in northern California, and continues to participate in network-building efforts. His nuts-and-bolts guide covers: Selecting the appropriate equipment Finding antenna sites, and building and installing antennas Protecting your network from inappropriate access New network monitoring tools and techniques (new) Regulations affecting wireless deployment (new) IP network administration, including DNS and IP Tunneling (new) His expertise, as well as his sense of humor and enthusiasm for the topic, makes Building Wireless Community Networks a very useful and readable book for anyone interested in wireless connectivity.
Download or read book Technocratic Dreaming written by Paul James and published by . This book was released on 1990 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Technocratic dreaming of very fast trains and Japanese designer cities.
Download or read book Wireless Hacks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.
Download or read book A Short History of Africa written by and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes text, vocabulary lists, and comprehension questions designed to acquaint students with the history of Africa.
Download or read book Political Protest in the Congo written by Herbert F. Weiss and published by Princeton, N.J. : Princeton University Press. This book was released on 1967 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this first detailed study of the PSA, a party that has played a crucial role in Congolese politics, Weiss describes the growth of political parties from 1957 to 1960, and gives a history of the PSA, and of the anti-colonial protest in the Kwango-Kwilu area.Originally published in 1967.The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
Download or read book Energy Balances of Non OECD Countries written by Organization for Economic Cooperation and Development and published by OCDE. This book was released on 2014-09-05 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains data for 2011 and 2012 on the supply and consumption of coal, oil, natural gas, electricity, heat, renewables and waste presented as comprehensive energy balances. Data are expressed in thousand tonnes of oil equivalent for over 100 non-OECD countries. Historical tables summarise production, trade and final consumption data as well as key energy and economic indicators. These tables also include preliminary estimates of 2013 production (and trade when available) for natural gas, primary coal and oil. This book includes definitions of products and flows, explanatory notes on the individual country data and conversion factors from original units to energy units. More detailed data in original units are published in the 2014 edition of Energy Statistics of Non-OECD Countries, the sister volume of this publication.
Download or read book World Development Indicators 2008 written by World Bank and published by World Bank Publications. This book was released on 2008-04-11 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: Looking for accurate, up-to-date data on development issues? 'World Development Indicators' is the World Bank's premier annual compilation of data about development. This indispensable statistical reference allows you to consult over 900 indicators for some 150 economies and 14 country groups in more than 80 tables. It provides a current overview of the most recent data available as well as important regional data and income group analysis in six thematic sections: World View, People, Environment, Economy, States and Markets, and Global Links.
Download or read book What Led to the Discovery of the Source of the Nile written by John Hanning Speke and published by Edinburgh : W. Blackwood. This book was released on 1864 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Through the Dark Continent Or The Sources of the Nile Around the Great Lakes of Equatorial Africa and Down the Livingstone River to the Atlantic written by Henry M and published by Legare Street Press. This book was released on 2022-10-27 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book Atlas of the United Republic of Cameroon written by and published by . This book was released on 1980 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Statistical Data Book written by Dr. R.S. Nagarazan and published by New Age International. This book was released on 2007 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Book Contains The Elaborated And Clearly Defined Parametric And Non-Parametric Designs. This Is The Unique Compilation Of The Concepts, Processes, Practices And Applications Of The Total Quality Management. The Book Has Been Revised And Updated With All The Relevant And Required Tables With Essential And Precise Details. The Revised Edition Has Been Categorized Into Three Different Sections As Per Their Respective Requirements And To Highlight The Importance. The Data Book Is Extremely Beneficial For The Students Of Master, Bachelor Degree, And Diploma Courses In Engineering, Technology And Management. It Will Also Be Useful For The Teachers, Research Scholars And Students In The Field Of Engineering And Technology.
