Download Les antennes : Théorie, conception et applications by Odile Picon PDF

By Odile Picon

Les antennes constituent un section crucial des systèmes utilisant le rayonnement électromagnétique (télécommunications, télévision, RFID, radiodétection...). l. a. variété des antennes est grande du fait de leurs nombreuses purposes et aussi des différentes bandes de fréquences dans lesquelles elles sont utilisées. L'ouvrage donne les éléments essentiels à l. a. compréhension théorique des antennes, suggest une class des antennes en fonction de différents elements (leurs purposes, l. a. taille du système, los angeles largeur de bande souhaitée, los angeles forme géométrique, etc.) et fournit enfin l'ensemble des informations nécessaires à l. a. belief et au dimensionnement des systèmes. Les principes de los angeles modélisation numérique sont notamment abordés, illustrés par de nombreuses exemples. Un chapitre est consacré aux mesures.

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Download The Post Card: From Socrates to Freud and Beyond by Jacques Derrida PDF

By Jacques Derrida

17 November 1979 You have been studying a a bit unfashionable loveletter, the final in heritage. yet you haven't but acquired it. definite, its lack or far more than deal with prepares it to fall into all fingers: a publish card, an open letter within which the key looks, yet indecipherably. What does a submit card are looking to say to you? On what stipulations is it attainable? Its vacation spot traverses you, you now not be aware of who you're. on the very rapid whilst from its handle it interpellates, you, uniquely you, rather than achieving you it divides you or units you apart, sometimes overlooks you. and also you love and also you don't love, it makes of you what you need, it takes you, it leaves you, it delivers. at the different facet of the cardboard, glance, a proposition is made to you, S and p, Socrates and plato. For as soon as the previous turns out to jot down, and along with his different hand he's even scratching. yet what's Plato doing together with his outstretched finger in his again? when you occupy your self with turning it round in each path, it's the photograph that turns you round like a letter, prematurely it deciphers you, it preoccupies area, it procures your phrases and gestures, all of the our bodies that you just think you invent in an effort to confirm its define. you end up, you, your self, on its direction. The thick help of the cardboard, a ebook heavy and lightweight, is additionally the threat of this scene, the research among Socrates and Plato, at the software of a number of others. just like the soothsayer, a ''fortune-telling book'' watches over and speculates on that-which-must-happen, on what it certainly may perhaps suggest to ensue, to reach, to need to occur or arrive, to permit or to make ensue or arrive, to destine, to handle, to ship, to legate, to inherit , etc., if all of it nonetheless indicates, among right here and there, the close to and the a long way, da und castle , the single or the opposite. You situate the topic of the booklet: among the posts and the analytic move, the excitement precept and the background of telecommunications, the put up card and the purloined letter, in a note the transference from Socrates to Freud, and past. This satire of epistolary literature needed to be farci, crammed with addresses, postal codes, crypted missives, nameless letters, it all confided to such a lot of modes, genres, and tones. In it I additionally abuse dates, signatures, titles or references, language itself. J. D. ''With The put up Card , as with Glas , Derrida appears to be like extra as author than as thinker. Or let's imagine that the following, in what's partly a ridicule epistolary novel (the lengthy part is named ''Envois,'' approximately, ''dispatches'' ), he levels his writing extra brazenly than within the scholarly works. . . . The put up Card additionally encompasses a sequence of self-reflective essays, principally involved in Freud, during which Derrida is superbly lucid and direct.''—Alexander Gelley, Library magazine

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