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Author: Geraldine Ghio
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Author: Geraldine Ghio
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Author: DANIEL.. AUGUSTIN
Publisher:
ISBN:
Category :
Languages : fr
Pages : 280
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Book Description
CE MEMOIRE DEVELOPPE UNE ANALYSE DU RAYONNEMENT PRODUIT PAR DES ANTENNES IMPRIMEES, DISPOSEES EN RESEAU, SUR DES SURFACES PLANES OU CONFORMEES. APRES AVOIR MIS L'ACCENT SUR LES PRINCIPALES TECHNIQUES D'ALIMENTATION D'ANTENNES MICRORUBAN, NOUS ETUDIONS LA FAISABILITE D'UN RESEAU PLAN A PARTIR D'UN CAHIER DES CHARGES PRECIS. C'EST A TRAVERS CETTE APPLICATION CONCRETE, QUE NOUS METTONS EN EVIDENCE L'INTERET DE REMPLACER LES PARABOLES EXISTANTES PAR DES RESEAUX D'ELEMENTS RAYONNANTS IMPLANTES SUR DES STRUCTURES PLANES. LES DISPOSITIFS MECANIQUES ASSOCIES A CES PARABOLES ET DESTINES A DEPOINTER LE FAISCEAU SONT DONC REMPLACES PAR LA FONCTION DE BALAYAGE ELECTRONIQUE, OBTENUE A PARTIR D'UNE LOI D'ILLUMINATION EN PHASE, ADAPTEE A L'ORIENTATION DESIREE. CES RESEAUX PRESENTENT TOUTEFOIS UN RAYONNEMENT LIMITE AU DEMI-ESPACE, CE QUI CONSTITUE UN REEL HANDICAP POUR CERTAINES APPLICATIONS NECESSITANT UNE COUVERTURE OMNIDIRECTIONNELLE. C'EST POURQUOI, NOUS AVONS ELABORE UN LOGICIEL D'ANALYSE DU RAYONNEMENT PRODUIT PAR DES ANTENNES DISPOSEES SUR DES STRUCTURES CONFORMEES. LA GEOMETRIE DES RESEAUX EST OBTENUE A PARTIR D'ELEMENTS REGROUPES SOUS LA FORME DE COURONNE, CHACUN DES ELEMENTS POUVANT SUBIR UNE OU PLUSIEURS ROTATIONS SUR LUI-MEME. AINSI, NOUS FAISONS APPEL A DES TRANSFORMATIONS MATHEMATIQUES DE REPERES, APPLIQUEES AU CHAMP RAYONNE PAR LA SOURCE ELEMENTAIRE, LUI-MEME CALCULE A PARTIR D'UNE METHODE DES MOMENTS SIMPLIFIEE. C'EST A PARTIR DE CES ROTATIONS QUE L'ON PARVIENT A SIMULER DIVERS RESEAUX, CONFORMES OU PAS, RESEAUX DIEDRE, PYRAMIDE SIMPLE OU A BASE OCTOGONALE, CONIQUE, MAIS EGALEMENT DES STRUCTURES PLANES OU CYLINDRIQUES. DE TELLES ANTENNES PRESENTENT UN INTERET CERTAIN POUR LEUR SOUPLESSE D'IMPLANTATION SUR DES SURFACES DE FORMES QUELCONQUES ET SONT AINSI A L'ORIGINE D'APPLICATIONS TRES DIVERSES, PARTICULIEREMENT POUR DES COMMUNICATIONS ENTRE MOBILES QUI NECESSITENT DES COUVERTURES ANGULAIRES DE RAYONNEMENT SOUVENT TRES LARGES, MAIS AUSSI ADAPTATIVES
Author: Rob Flickenger
Publisher: "O'Reilly Media, Inc."
ISBN: 9780596005023
Category : Computers
Languages : en
Pages : 190
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Book Description
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.
Author: Rob Flickenger
Publisher: "O'Reilly Media, Inc."
ISBN: 9780596005597
Category : Computers
Languages : en
Pages : 310
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Book Description
Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.
Author: Jean Echenoz
Publisher:
ISBN: 9781565844476
Category : Fiction
Languages : en
Pages : 201
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Book Description
Jean-Claude Kastner is assigned to find Gloire Stella, a popular singer who disappeared four years earlier
Author: Sandor Hervey
Publisher: Routledge
ISBN: 1134899327
Category : Language Arts & Disciplines
Languages : en
Pages : 273
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Book Description
Thinking Translation is a comprehensive and revolutionary 20-week course in translation method. It has been fully and successfully piloted at the University of St. Andrews. The course offers a challenging and entertaining approach to the acquisition of translation skills. Translation is presented as a problem-solving discipline. Discussion, examples and a full range of exercise work allows students to acquire the skills necessary for a broad range of translation problems. Thinking Translation draws on a wide range of material from technical texts to poetry and song.
Author: Jean Echenoz
Publisher: New Press, The
ISBN: 1595589244
Category : Fiction
Languages : en
Pages : 130
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Book Description
Five Frenchmen go off to war, two of them leaving behind a certain young woman who longs for their return. But the main character in 1914 is the Great War itself. Jean Echenoz, the multi–;award–;winning French literary magician whose work has been compared to Joseph Conrad and Lawrence Sterne, has brought that deathtrap back to life, leading us gently from a balmy summer day deep into the insatiable—and still unthinkable—carnage of trench warfare. With the delicacy of a miniaturist and with irony both witty and clear–;eyed, the author offers us an intimate epic with the atmosphere of a classic movie: in the panorama of a clear blue sky, a biplane spirals suddenly into the ground; a tardy piece of shrapnel shears the top off a man's head as if it were a soft–;boiled egg; we dawdle dreamily in a spring–;scented clearing with a lonely shell–;shocked soldier strolling innocently to a firing squad ready to shoot him for desertion. But ultimately, the grace notes of humanity in 1914 rise above the terrors of war in this beautifully crafted tale that Echenoz tells with discretion, precision, and love.
Author: Edgar Allan Poe
Publisher: Leone Editore
ISBN: 8892967657
Category : Fiction
Languages : it
Pages : 49
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Book Description
Un anonimo narratore ci racconta del suo amore perduto Ligeia, una donna alta, dai capelli neri, estremamente intelligente, che credeva che la morte potesse essere sconfitta con la forza di volontà. Inoltre era innamorata in maniera ossessiva del marito, lo idolatrava, ricambiata. Quando lei muore lui è affranto. Qualche tempo dopo decide di andare avanti con la sua vita e si risposa. Strane cose cominciano ad accadere mentre il narratore continua a pensare sempre di più al suo primo amore, Ligeia…
Author: Arthur W. Chickering
Publisher: Transaction Publishers
ISBN: 9780915390106
Category : Education
Languages : en
Pages : 89
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Author: Robert S. Zais
Publisher: Addison-Wesley Longman
ISBN:
Category : Education
Languages : en
Pages : 538
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