Download or read book Contribution l tude des antennes di lectriques p riodiques ondes de fuite et application la r alisation d un r seau written by Benoît Lejay and published by . This book was released on 1993 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES ANTENNES DIELECTRIQUES A ONDES DE FUITE SONT ETUDIEES AVEC UNE METHODE VARIATIONNELLE. CETTE ANALYSE EN MODES HYBRIDES REPOSE SUR UN MODELE OU LA LARGEUR FINIE DE CES ANTENNES EST PRISE EN COMPTE. LA VALIDATION DU PROGRAMME REALISE, LES RESULTATS NUMERIQUES OBTENUS ONT PERMIS DE MONTRER L'INFLUENCE DES EFFETS DE BORDS SUR LES CARACTERISTIQUES DE RAYONNEMENT. L'ASSOCIATION EN RESEAU DE CES ANTENNES DISPERSIVES PERMET D'AMELIORER LEURS PERFORMANCES DE FACON SENSIBLE. LA REALISATION D'UNE ANTENNE RESEAU COMPOSEE DE HUIT GUIDES DIELECTRIQUES A ONDES DE FUITE ALIMENTES PAR UN DISPOSITIF EN STRUCTURE PLANAIRE EST DECRITE. LES RESULTATS OBTENUS PERMETTENT D'ENVISAGER L'UTILISATION DE CE TYPE D'ANTENNE DANS LES SYSTEMES RADAR ET DE COMMUNICATIONS MOBILES

Download or read book Contribution a l etude des antennes dielectriques periodiques a ondes de fuite et application a la realisation d un reseau written by Benoit Lejay and published by . This book was released on 1993 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution l tude des antennes micro rubans ondes de fuite written by Mohammad Ghomi and published by . This book was released on 1992 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL CONCERNE L'ETUDE DES ANTENNES MICRO-RUBANS A ONDES DE FUITE (AOF), EN VUE DE L'OBTENTION DES CARACTERISTIQUES DE RAYONNEMENT ET DE BALAYAGE, POUR LEUR UTILISATION DANS DES RESEAUX BIDIMENSIONNELS. D'UNE MANIERE GENERALE, NOUS PROPOSONS UN MODELE DE GUIDE D'ONDES POUR CARACTERISER LES DIFFERENTES FORMES DE CES ANTENNES. LA METHODE DE GALERKIN EST UTILISEE COMME METHODE DE RESOLUTION. LE CHAMP LOINTAIN EST OBTENU A PARTIR DU CHAMP PROCHE PAR TRANSFORMEE DE FOURIER. DANS UNE PREMIERE PARTIE, UNE ANALYSE BIDIMENSIONNELLE DES ANTENNES A ONDES DE FUITE UNIFORME ET NON UNIFORME EST PRESENTEE. LA CONFRONTATION DES CARACTERISTIQUES DE RAYONNEMENT THEORIQUES ET EXPERIMENTALES EN BANDE X ET KU POUR UNE ANTENNE UNIFORME SE REVELE SATISFAISANTE. DANS LA DEUXIEME PARTIE EST PRESENTEE L'ETUDE TRIDIMENSIONNELLE DES AOF A PATCH PERIODIQUE SIMPLES ET COUPLEES. L'EFFET DE LA VARIATION D'EPAISSEUR D'UN GAP D'AIR INTRODUIT DANS LA STRUCTURE SUR LA DIRECTION DU LOBE PRINCIPAL PERMET DE CONCEVOIR UN BALAYAGE ELECTRONIQUE A FREQUENCE CONSTANTE. DANS LA TROISIEME PARTIE, UN MODELE DE GUIDE D'ONDES EQUIVALENT DEFINI A PARTIR DE L'ANALYSE TRIDIMENSIONNELLE PERMET DE REMPLACER EFFICACEMENT CETTE DERNIERE PAR UNE ANALYSE BIDIMENSIONNELLE QUI REDUIT CONSIDERABLEMENT LE TEMPS DE CALCUL

Download or read book Contribution l tude des antennes ondes progressives et application la r alisation de r seaux polarisation lin aire ou circulaire written by Ali Alaeddine and published by . This book was released on 1993 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES ANTENNES A ONDES PROGRESSIVES SONT ETUDIEES A L'AIDE DE DEUX OUTILS NUMERIQUES (DIFFERENCES FINIES EN REGIME TEMPOREL ET EQUATION INTEGRALE EN REGIME FREQUENTIEL). CETTE ETUDE A PERMIS UNE ANALYSE FINE DU COMPORTEMENT ELECTROMAGNETIQUE DE CES ANTENNES (FILAIRES OU MICRORUBANS), AFIN DE COMPRENDRE LEUR PRINCIPE DE FONCTIONNEMENT. UNE ATTENTION TOUTE PARTICULIERE EST APPORTEE AUX EFFETS DE DISCONTINUITES SUR LES CARACTERISTIQUES DE RAYONNEMENT. L'ASSOCIATION EN RESEAU DE CES ANTENNES (MICRORUBANS EN PARTICULIER) PERMET D'AMELIORER LEURS PERFORMANCES DE FACON IMPORTANTE. LA REALISATION D'UN RESEAU LINEAIRE, COMPOSE DE HUIT ANTENNES A ONDES PROGRESSIVES MICRORUBANS ALIMENTEES EN SERIE, CAPABLE D'UN BALAYAGE DU LOBE EN FONCTION DE LA FREQUENCE EST DECRITE. L'UTILISATION D'UN OUTIL DE SYNTHESE DE RESEAUX A PERMIS D'AMELIORER LA PERFORMANCE DE CE RESEAU EN ASSOCIANT HUIT RESEAUX LINEAIRES (SOUS-RESEAUX) AU SEIN D'UN RESEAU PLAN. DANS LE CADRE DU PROJET SYCOMORES (AVANT-PROJET CNES), UNE REALISATION D'UN RESEAU, DE 4 ELEMENTS, A POLARISATION CIRCULAIRE DESTINE AUX MOBILES EST PRESENTEE. L'ELEMENT DE BASE (ANSERLIN) EST UNE ANTENNE A ONDES PROGRESSIVES DE FORME ANNULAIRE REALISE NATURELLEMENT LA POLARISATION CIRCULAIRE A PARTIR D'UNE SEULE SOURCE D'EXCITATION. LES RESULTATS OBTENUS MONTRENT LA FAISABILITE D'UN SYSTEME RAYONNANT MOBILE

Download or read book The Voice in Cinema written by Michel Chion and published by Columbia University Press. This book was released on 1999 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chion analyzes imaginative uses of the human voice by directors like Lang, Hitchcock, Ophuls, Duras, and de Palma.

Download or read book Color Television Receivers written by and published by . This book was released on 1978 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report to the President on investigation no. 332-95 under section 332 of the Tariff Act of 1930, as amended.

Download or read book Treatise on Musical Objects written by Pierre Schaeffer and published by Univ of California Press. This book was released on 2017-07-25 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Treatise on Musical Objects is regarded as Pierre Schaeffer’s most important work on music and its relationship with technology. Schaeffer expands his earlier research in musique concrète to suggest a methodology of working with sounds based on his experiences in radio broadcasting and the recording studio. Drawing on acoustics, physics, and physiology, but also on philosophy and the relationship between subject and object, Schaeffer’s essay summarizes his theoretical and practical work in music composition. Translators Christine North and John Dack present an important book in the history of ideas in Europe that will resonate far beyond electroacoustic music.

Download or read book Philostratus written by Philostratus (the Athenian) and published by . This book was released on 1912 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analecta Or Materials For a History of Remarkable Providences Mostly Relating to Scotch Ministers and Christians written by Robert Wodrow and published by BoD – Books on Demand. This book was released on 2024-05-25 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reprint of the original, first published in 1842.

Download or read book Ecological Consequences of Climate Change written by Erik A. Beever and published by CRC Press. This book was released on 2016-04-19 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contemporary climate change is a crucial management challenge for wildlife scientists, conservation biologists, and ecologists of the 21st century. Climate fingerprints are being detected and documented in the responses of hundreds of wildlife species and numerous ecosystems around the world. To mitigate and accommodate the influences of climate ch

Download or read book K Zone Prank Patrol written by and published by . This book was released on 2010 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Play pranks and score laughs from your friends and family! Your day can sometimes be a total drag, but with some creative thinking and the help of the pranks in this book, you can make it a barrel of laughs! Get your friends in on the act! Pranks are ranked so kids can determine the likely level of punishment, from the most benign ('Clean Your Bedroom') to the most dare-devilish ('Xtreme Grounding Guaranteed')! So, PRANK AT YOUR OWN RISK!