Contribution A Letude Dantennes Reseaux Large Bande A Pointage Pilote Par Commande Optique

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Contribution à l'étude d'antennes réseaux large bande à pointage pilote par commande optique

Author : Hervé Parvery
Publisher :
ISBN 13 :
Total Pages : 208 pages
Book Rating : 4.:/5 (799 download)

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Book Synopsis Contribution à l'étude d'antennes réseaux large bande à pointage pilote par commande optique by : Hervé Parvery

Download or read book Contribution à l'étude d'antennes réseaux large bande à pointage pilote par commande optique written by Hervé Parvery and published by . This book was released on 2002 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse porte sur l'étude et la faisabilité d'une antenne réseau dont le balayage est assuré par une commande optique. Le réseau d'antennes est alimenté par des "retards vrais". Trois systèmes sont proposés. Le premier fonctionne à 960 MHz et permet de valider le pilotage de la direction d'émission du réseau avec la longueur d'onde de la porteuse optique. La deuxième antenne présente une large bande passante autour de 2 GHz (25%) afin de montrer que la direction de pointage du réseau reste invariante avec la fréquence émise. Le dernier système étudié conduit à la conception et à la réalisation d'un prototype fonctionnant dans le domaine millimétrique. Il utilise le système précédent à basse fréquence, pour générer les retards, auquel est associée une technique de mélange microonde pour obtenir des ondes millimétriques déphasées. L'intérêt de ce système est d'obtenir un contrôle de la direction de pointage large bande et de simplifier le circuit d'alimentation des éléments rayonnants.

Etude des antennes hélices quadrifilaires imprimées larges bandes et multibandes - Application en bande Ku.; Contribution à l'étude générale du couplage mutuel

Download Etude des antennes hélices quadrifilaires imprimées larges bandes et multibandes - Application en bande Ku.; Contribution à l'étude générale du couplage mutuel PDF Online Free

Author : Yoann Letestu
Publisher :
ISBN 13 :
Total Pages : 202 pages
Book Rating : 4.:/5 (492 download)

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Book Synopsis Etude des antennes hélices quadrifilaires imprimées larges bandes et multibandes - Application en bande Ku.; Contribution à l'étude générale du couplage mutuel by : Yoann Letestu

Download or read book Etude des antennes hélices quadrifilaires imprimées larges bandes et multibandes - Application en bande Ku.; Contribution à l'étude générale du couplage mutuel written by Yoann Letestu and published by . This book was released on 2004 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les objectifs de cette thèse étaient d'une part, l'étude des antennes hélices quadrifilaires imprimées (HQI) larges bandes et multibandes, et d'autre part, l'étude générale du couplage mutuel dans l'optique de réseaux d'antennes de moyennes ou grandes tailles. Ces travaux de recherches ont été développés dans le cadre d'un projet RNRT sur le développement d'une antenne multisatellite en bande Ku. La première partie de ce manuscrit a abouti à deux nouvelles configurations d'antennes HQI : une antenne HQI repliée large bande et une antenne HQI multibande. La seconde partie de ce mémoire de thèse a permis de donner une formulation de correction de couplage homogénéisée pour différentes natures d'antennes. De plus, l'influence du couplage sur les diagrammes de rayonnement d'un réseau a aussi été montrée et une méthode d'analyse des diagrammes présentée.

Contribution à l'étude d'antennes de puissance à efficacité optimisée

Author : Antoine Chauloux
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.:/5 (919 download)

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Book Synopsis Contribution à l'étude d'antennes de puissance à efficacité optimisée by : Antoine Chauloux

Download or read book Contribution à l'étude d'antennes de puissance à efficacité optimisée written by Antoine Chauloux and published by . This book was released on 2014 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'émergence depuis ces dernières années de nouvelles capacités technologiques permettant la mise en œuvre de dispositifs d'agression électromagnétique, imposent d'étudier la faisabilité de ces potentielles Armes à Energie Dirigée ÉlectroMagnétiques (AED EM). Parmi les différentes briques technologiques qui composent ces systèmes, l'aérien est l'élément déterminant de la formation du faisceau d'ondes rayonnées et nécessite donc d'être évalué. C'est dans ce contexte que le Centre de Gramat du Commissariat à l'Énergie Atomique et aux Énergies Alternatives s'est associé à la Direction Générale de l'Armement afin de proposer cette thèse réalisée en collaboration avec l'Institut d'Électronique et de Télécommunications de Rennes. Le sujet propose l'étude complète de trois solutions antennaires susceptibles d'être intégrées sur un système de type AED EM. Chaque type d'antenne répond à une problématique qui lui est propre : Il s'agit en premier lieu de réaliser une antenne fonctionnant à fréquence fixe et possédant un gain maximisé ; Dans un second temps l'étude est menée afin de concevoir et réaliser une antenne à diagramme de rayonnement variable dans un plan et stable dans l'autre plan ; Enfin une antenne large bande fonctionnant sur une octave est développée dans le but de maintenir un diagramme de rayonnement possédant des ouvertures à mi-puissance constantes. Chacune de ces études est gouvernée par deux contraintes difficiles que sont d'une part le maintien d'une tenue en puissance élevée (niveau injecté de l'ordre du kilowatt pulsé) et d'autre part un encombrement réduit en vue d'une intégration sur porteur par exemple. Chaque antenne est élaborée à l'aide d'un logiciel de calcul électromagnétique puis réalisée afin d'être validée expérimentalement.

Dictionary of Building and Civil Engineering

Author : Don Montague
Publisher : Taylor & Francis
ISBN 13 : 9780419199106
Total Pages : 472 pages
Book Rating : 4.1/5 (991 download)

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Book Synopsis Dictionary of Building and Civil Engineering by : Don Montague

Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.

Building Wireless Community Networks

Author : Rob Flickenger
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 9780596005023
Total Pages : 190 pages
Book Rating : 4.0/5 (5 download)

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Book Synopsis Building Wireless Community Networks by : Rob Flickenger

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.

Livestock Policy Analysis

Author : International Livestock Research Institute
Publisher : ILRI (aka ILCA and ILRAD)
ISBN 13 : 9789291460038
Total Pages : 268 pages
Book Rating : 4.4/5 (6 download)

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Book Synopsis Livestock Policy Analysis by : International Livestock Research Institute

Download or read book Livestock Policy Analysis written by International Livestock Research Institute and published by ILRI (aka ILCA and ILRAD). This book was released on 1995-01-01 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Policy concepts; Identification of policy issues; Production systems, supply and demand; Market, price and trade policies; Marketing and distribution systems; Budget and manpower planning; Land tenure police for the livestock sector; Policy analysis report writing and communication; Livestock production and marketing in alphabeta - a case study.

Wireless Hacks

Author : Rob Flickenger
Publisher : "O'Reilly Media, Inc."
ISBN 13 : 9780596005597
Total Pages : 310 pages
Book Rating : 4.0/5 (55 download)

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Book Synopsis Wireless Hacks by : Rob Flickenger

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.

A Phonetic Dictionary of the English Language

Author : Hermann Michaelis
Publisher :
ISBN 13 :
Total Pages : 486 pages
Book Rating : 4.:/5 (89 download)

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Book Synopsis A Phonetic Dictionary of the English Language by : Hermann Michaelis

Download or read book A Phonetic Dictionary of the English Language written by Hermann Michaelis and published by . This book was released on 1913 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:

NATO Glossary of Terms and Definitions

Author : North Atlantic Treaty Organization
Publisher : CreateSpace
ISBN 13 : 9781482679441
Total Pages : 450 pages
Book Rating : 4.6/5 (794 download)

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Book Synopsis NATO Glossary of Terms and Definitions by : North Atlantic Treaty Organization

Download or read book NATO Glossary of Terms and Definitions written by North Atlantic Treaty Organization and published by CreateSpace. This book was released on 2013-03-08 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: NATO Glossary of terms and definitions (English and French). Listing terms of military significance and their definitions for use in NATO.

NATO Glossary of Abbreviations Used in NATO Documents and Publications

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (789 download)

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Book Synopsis NATO Glossary of Abbreviations Used in NATO Documents and Publications by :

Download or read book NATO Glossary of Abbreviations Used in NATO Documents and Publications written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Simplexity

Author : Alain Berthoz
Publisher : Odile Jacob
ISBN 13 : 2738147453
Total Pages : 187 pages
Book Rating : 4.7/5 (381 download)

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Book Synopsis Simplexity by : Alain Berthoz

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 187 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].

The Oxford Dictionary of English Grammar

Author : Bas Aarts
Publisher : OUP Oxford
ISBN 13 : 0191079006
Total Pages : 464 pages
Book Rating : 4.1/5 (91 download)

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Book Synopsis The Oxford Dictionary of English Grammar by : Bas Aarts

Download or read book The Oxford Dictionary of English Grammar written by Bas Aarts and published by OUP Oxford. This book was released on 2014-01-16 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Oxford Dictionary of English Grammar is a straightforward and accessible A-Z guide to the diverse and often complex terminology of English grammar. It contains over 1,600 entries with clear and concise definitions, enhanced by numerous example sentences, as well as relevant quotations from the scholarly literature of the field. This second edition is written and edited by Professor Bas Aarts of University College London, writer of the acclaimed Oxford Modern English Grammar. It has been fully revised and updated, with particular attention paid to refreshing the example sentences included within the text. There are over 150 new entries that cover current terminology which has arisen since the publication of the first edition, and there are also new entries on the most important English grammars published since the start of the 20th century. Hundreds of new cross-references enhance the user-friendly nature of the text, and the list of works cited has been thoroughly updated to reflect the current state of the field. A short appendix of web links has been added. All in all, this Dictionary is an invaluable guide to English grammar for all students and teachers of the subject, as well as all those with an informed interest in the English language.

Internet Dreams

Author : Mark Stefik
Publisher : MIT Press
ISBN 13 : 9780262692021
Total Pages : 444 pages
Book Rating : 4.6/5 (92 download)

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Book Synopsis Internet Dreams by : Mark Stefik

Download or read book Internet Dreams written by Mark Stefik and published by MIT Press. This book was released on 1997 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Internet Dreams illuminates not only how "the Net" is being created, but also stories about ourselves as our lives become electronically interconnected. Stefik explores some of the most provocative writings about the Internet to tease out the deeper metaphors and myths. 24 illustrations.

Transforming Computer Technology

Author : Arthur L. Norberg
Publisher : Johns Hopkins University Press
ISBN 13 : 9780801863691
Total Pages : 0 pages
Book Rating : 4.8/5 (636 download)

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Book Synopsis Transforming Computer Technology by : Arthur L. Norberg

Download or read book Transforming Computer Technology written by Arthur L. Norberg and published by Johns Hopkins University Press. This book was released on 2000-02-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Winner of the Association of American Publishers Professional and Scholarly Publishing Award for Computer Science Over the course of several decades, the Pentagon's Information Processing Techniques Office (IPTO) helped transform computing from a cumbersome enterprise based on batch processing to the instantly interactive, graphically rich, highly intelligent computing of today. With the purpose of improving command and control systems for the military, IPTO researchers strengthened time-sharing, laid the groundwork for graphics and parallel processing, contributed to the study of artificial intelligence, and developed the wide-area network that came to be known as the Internet. Transforming Computer Technology examines these and other developments at the Defense Department's Advanced Research Projects Agency in its heyday between 1962 and 1986. The authors show how Pentagon programs affected significant developments in both computer science and engineering. They analyze the management of the office, the origins and growth of important IPTO programs, and the interaction of the staff with the R & D community. They pay special attention to IPTO's role in executing research at the leading edge of computing and networking and in working with the military to transfer that research into practical use. And they show how, by the 1990s, the research results had been assimilated into systems both for the military and for civilian society.

Naval Arctic Manual

Author :
Publisher :
ISBN 13 :
Total Pages : 344 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Naval Arctic Manual by :

Download or read book Naval Arctic Manual written by and published by . This book was released on 1990 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Penguin Guide to Punctuation

Author : R L Trask
Publisher : Penguin UK
ISBN 13 : 0141991585
Total Pages : 112 pages
Book Rating : 4.1/5 (419 download)

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Book Synopsis The Penguin Guide to Punctuation by : R L Trask

Download or read book The Penguin Guide to Punctuation written by R L Trask and published by Penguin UK. This book was released on 2019-06-13 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Penguin Guide to Punctuation is indispensable for anyone who needs to get to grips with using punctuation in their written work. Whether you are puzzled by colons and semicolons, unsure of where commas should go or baffled by apostrophes, this jargon-free, succinct guide is for you.

Agricultural English

Author : Georgeta Raţă
Publisher : Cambridge Scholars Publishing
ISBN 13 : 1443839612
Total Pages : 385 pages
Book Rating : 4.4/5 (438 download)

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Book Synopsis Agricultural English by : Georgeta Raţă

Download or read book Agricultural English written by Georgeta Raţă and published by Cambridge Scholars Publishing. This book was released on 2012-04-25 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Agricultural English is a collection of essays on the English of Agriculture. The approach is a linguistic one: the different aspects of the English used in the field of agriculture (agricultural practices, agricultural systems) and in some fields related to agriculture (agricultural zoology, agri-tourism, biology, botany, ecology, entomology, gastronomy, land measurement, plant pathology, zoology) are analysed from a morphological (combination, derivation), syntactical (nominal phrases, verbal phrases), lexical and lexicographical, semantic (homonymy, semantic fields, synonymy, terminology), pragmatic (academic discourse, idiom, metaphor), etymological (etymon, Latin heritage), and contrastive (English–Croatian, English–French, English–German, English–Romanian, Romanian–English) points of view. The book will appeal to agriculturists, animal breeders, professors, researchers, students, and translators from Croatian-, English-, French-, German-, and Romanian-speaking countries, active in their own countries or abroad. The types of academic readership it would appeal to include academic teaching staff, researchers and students in the fields of agriculture and related fields – agricultural zoology, agri-tourism, biology, botany, ecology, entomology, gastronomy, land measurement, plant pathology, and zoology.