Download or read book CONTRIBUTION A L ETUDE DES INTERACTIONS ENTRE HYPERFREQUENCES ET CHAMPS D ONDES DE SURFACE written by Anne Lifermann and published by . This book was released on 1987 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE PRESENTE UNE ETUDE EXPERIMENTALE REALISEE DANS LA GRANDE SOUFFLERIE DE SIMULATION DES ECHANGES AIR-MER DE L'I.M.S.T AVEC LE DIFFUSIOMETRE RAMSES 2 DU C.N.E.S. AFIN DE PRECISER LES MECANISMES DE RETRODIFFUSION DES HYPERFREQUENCES A LA SURFACE DE LA MER. UNE REVUE CRITIQUE DES CONNAISSANCES ACTUELLES EN MATIERE DE DYNAMIQUE DES VAGUES ET DE MODELES DE RETRODIFFUSION PAR LES SURFACES RUGUEUSES A D'ABORD ETE EFFECTUEE. ELLE FOURNIT LES ELEMENTS QUI PERMETTRONT AUX NON SPECIALISTES DE L'UN OU L'AUTRE DES DEUX DOMAINES CONCERNES D'APPREHENDER DE FACON GLOBALE LE PROBLEME DE L'INTERPRETATION DES DONNEES DE TELEDETECTION HYPERFREQUENCE EN TERME DE PARAMETRES OCEANO-METEOROLOGIQUES ET D'EVALUER LES MOYENS SUSCEPTIBLES D'APPORTER DE NOUVELLES SOLUTIONS. LA PROCEDURE EXPERIMENTALE MISE EN OEUVRE EST ENSUITE DECRITE. ELLE REPOND A L'OBJECTIF PRINCIPAL D'IDENTIFICATION DE PHASE DES MOUVEMENTS DE LA HOULE ET DES VAGUES QUI CONTRIBUENT DE MANIERE SIGNIFICATIVE A LA RETRODIFFUSION DES HYPERFREQUENCES, EN ASSOCIANT DES INSTRUMENTS TRES PERFECTIONNES DE MESURE DE LA TOPOGRAPHIE (HAUTEUR ET PENTES) DE LA SURFACE. LES SIGNAUX REFLECHIS, A 13.6 ET 5.3 HZ, AU VOISINAGE DE L'INCIDENCE VERTICALE POUR DIVERSES COMBINAISONS SIMPLES ET COMPLEXES DE HOULES ET VAGUES DE VENT SONT ANALYSES. LES RESULTATS PRINCIPAUX CONCERNENT: A) L'EXISTENCE D'UN NIVEAU DE REFLEXION PLUS IMPORTANT DANS LES CREUX QUE SUR LES CRETES DE LA HOULE ET L'IMPORTANCE DES CONDITIONS D'ILLUMINATION; B) LE ROLE PREDOMINANT DU DEFERLEMENT DANS LA REFLEXION PAR LES TRAINS DE HOULE; UNE INTERPRETATION ORIGINALE EST PROPOSEE; C) L'INFLUENCE SUR LA REFLEXION DE LA PRESENCE D'OSCILLATIONS DE COURTES LONGUEURS D'ONDE LE LONG DES PROFILS DE LA HOULE; D) LA NECESSITE DE PRENDRE EN COMPTE LA STRUCTURE TRIDIMENSIONNELLE DES CHAMPS DE VAGUES GENERES PAR LE VENT ET LE CARACTERE IMPULSIF DU SIGNAL RETRODIFFUSE MEME LORSQUE LA TACHE AU SOL COUVRE PLUSIEURS LONGUEURS D'ONDE DES VAGUES. LES EXPERIENCES COMPARATIVES REALISEES AU WALLOPS SPACE FLIGHT CENTER AVEC UN SYSTEME FOCALISE ET NON FOCALISE CONFIRMENT LES OPERATIONS PRECEDENTES. DISCUSSION DES IMPLICATIONS DE CES RESULTATS POUR LA POURSUITE DE TRAVAUX COMPLEMENTAIRES

Download or read book Contribution l tude des interactions entre hyperfr quences et champs d ondres de surface written by Anne Lifermann and published by . This book was released on 1987 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution l tude de l interaction entre les ondes acoustiques de surface et les lectrons d un s miconducteur en hyperfr quence written by Khiet LeVan and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book CONTRIBUTION A L ETUDE DE LA PROPAGATION DES ONDES ELECTROMAGNETIQUES DE SURFACE DANS UNE STRUCTURE FERRITE METAL written by C. L.. MINC and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LE BUT DE CETTE ETUDE EST LA REALISATION D'ISOLATEURS HYPERFREQUENCE A ONDES DE SURFACE ET CONSISTE, PAR CONSEQUENT, EN L'APPROFONDISSEMENT THEORIQUE DU PHENOMENE DE BASE INTERVENANT DANS CE DISPOSITIF: L'EXISTENCE D'UNE DISSYMETRIE DANS LA COURBE DE DISPERSION D'UNE STRUCTURE FERRITE-METAL. APRES UNE ETUDE THEORIQUE DANS L'APPROXIMATION MAGNETOSTATIQUE OU REALISE UNE ETUDE EXPERIMENTALE SUR DES POLYCRISTAUX FERRIMAGNETIQUES.

Download or read book ETUDE DES INTERACTIONS DES ONDES ELECTROMAGNETIQUES HYPERFREQUENCES AVEC LES MILIEUX FERRIMAGNETIQUES DIELECTRIQUES LA MATIERE INERTE ET VIVANTE written by Alain Priou and published by . This book was released on 1981 with total page 703 pages. Available in PDF, EPUB and Kindle. Book excerpt: THEORIE GENERALE DES FERRITES ET DES ONDES MAGNETIQUES; APPLICATION DES ONDES MAGNETIQUES: PROPAGATION DANS UN GUIDE REMPLI DE FERRITE, LIGNE A RETARD MAGNETOSTATIQUE, ETC... INTERACTION DES HYPERFREQUENCES AVEC LES DIELECTRIQUES; APPLICATIONS INDUSTRIELLES: SECHAGE, DECONGELATION. INTERACTION AVEC LA MATIERE VIVANTE; APPLICATIONS THERAPEUTIQUES: HYPERTHERMIE ET DIAGNOSTIC MEDICAL. EFFETS BIOLOGIQUES DES HYPERFREQUENCES

Download or read book ETUDE DE LA PROPAGATION DES ONDES DE CAPILLARITE MICROMETRIQUES A LA SURFACE DE L HELIUM SUPERFLUIDE written by PATRICE.. ROCHE and published by . This book was released on 1995 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL PORTE SUR L'ETUDE EXPERIMENTALE ET THEORIQUE DE L'ATTENUATION DES ONDES DE CAPILLARITE (RIPPLONS) A LA SURFACE DE L'HELIUM 4 SUPERFLUIDE. NOUS AVONS EXCITE ET DETECTE DES ONDES CAPILLAIRES DANS UN DOMAINE DE LONGUEUR D'ONDE ALLANT DE 3.3 M A 20 M, AU MOYEN DE STRUCTURES INTERDIGITEES COPLANAIRES. DANS LA LIMITE D'UNE PROFONDEUR D'HELIUM QUASI-INFINIE, LES ONDES DE SURFACE SE PROPAGENT SUR PLUSIEURS CENTIMETRES A BASSE TEMPERATURE ET LEUR ATTENUATION EST COMPATIBLE AVEC UNE LOI DE PUISSANCE EN T#4 DANS UN INTERVALLE DE TEMPERATURE ALLANT DE 350 MK A 700 MK. LA VALEUR EXPERIMENTALE DE L'ATTENUATION EST SIX ORDRES DE GRANDEUR PLUS FAIBLE QUE LES PREVISIONS THEORIQUES ANTECEDENTES A CE TRAVAIL. CES PREVISIONS DONNAIENT UN SUR-AMORTISSEMENT INHERENT AUX COLLISIONS DU RIPPLON SUB-THERMIQUES AVEC LES RIPPLONS THERMIQUES DE LA SURFACE. NOUS AVONS ALORS REEXAMINE LES THEORIES ET DEMONTRE QU'UN TERME IMPORTANT DANS LES COLLISIONS A 3 RIPPLONS AVAIT ETE OUBLIE, CE TERME ANNULANT PRESQUE EXACTEMENT L'INTERACTION ENTRE RIPPLONS SUB-THERMIQUES ET THERMIQUES. NOUS AVONS MONTRE QUE LA CONTRIBUTION DOMINANTE A L'ATTENUATION D'UN RIPPLON PROVENAIT DES COLLISIONS AVEC LES PHONONS DU MILIEU. L'INVERSE DU TEMPS DE VIE D'UN RIPPLON, DETERMINE PAR UN TEL PROCESSUS, EST EN EXCELLENT ACCORD AVEC NOS MESURES

Download or read book Contribution l tude des ondes de surface dans les circuits planaires par une m thode int grale written by Driss El-. Kouhen and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oceanographie spatiale written by and published by . This book was released on 1987 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution l tude du couplage d une onde de surface avec les porteurs d un semi conducteur haute r sistivit written by Malek Benslama and published by . This book was released on 1982 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microwave Imaging Methods and Applications written by Matteo Pastorino and published by Artech House. This book was released on 2018-06-30 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microwave Imaging Methods and Applications provides practitioners and researchers with a complete overview of the latest and most important noninvasive and nondestructive techniques for inspecting structures and bodies by using microwaves. Placing emphasis on applications, the book considers many areas, from medical imaging and security… to industrial engineering and subsurface prospection. For each application, readers are presented with the objectives of the inspection and related challenges. Moreover, this groundbreaking resource details computational methods that can be used to solve inverse problems related to specific applications. Including clear examples or the most significant practical results, this forward-looking reference focuses on systems that have been recently developed. Professionals gain the knowledge needed to compare imaging methods used in different applications and develop new uses of imaging apparatuses and systems.

Download or read book Water Resources in the Mediterranean Region written by Mehrez Zribi and published by Elsevier. This book was released on 2020-06-14 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water Resources in the Mediterranean Region summarizes and collates scientific developments around water resources in the Mediterranean socio-economic environment through a multidisciplinary framework synthesizing hydrology, hydrogeology, climate, bioclimatology, economics, and geography. As such, it provides essential information for any reader looking to learn more about the Mediterranean which is experiencing the impact of climate change and concurrent complex issues of anthropogenic effects, especially in agriculture and other resource uses. Water Resources in the Mediterranean Region covers different challenges in the issue of the evolution of water resources in the Mediterranean. It is intended for PhD students, research scientists, and managers interested in new solutions and approaches for water management and in the forecast of future water dynamics. Offers multidisciplinary content providing global visions of the challenges faced in the Mediterranean region Presents fundamental and operational studies, providing the reader with information on how to implement these actions and results themselves Written in a pedagogical manner, allowing for ease of reading for both researchers and water managers

Download or read book Experimental Chaos written by Stefano Boccaletti and published by A I P Press. This book was released on 2004-12-14 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 8th Experimental Chaos Conference again demonstrated the broad spectrum of areas where nonlinear dynamics plays an important role, such as circuits, hydrodynamics, optics, chemistry, fracture dynamics, neuroscience, and cognitive science. Additional contributions outline the trends for development and application of concepts and techniques of nonlinear dynamics.

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 The Theory of Ionization of Gases by Collision written by Sir John Townsend and published by . This book was released on 1910 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monitoring soils in the environment with remote sensing and gis written by Richard Escadafal and published by IRD Orstom. This book was released on 1996 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt: ISSS congress remote sensing

Download or read book Signal Processing for Communications written by Paolo Prandoni and published by Collection Savoir suisse. This book was released on 2008-06-17 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: With a novel, less classical approach to the subject, the authors have written a book with the conviction that signal processing should be taught to be fun. The treatment is therefore less focused on the mathematics and more on the conceptual aspects, the idea being to allow the readers to think about the subject at a higher conceptual level, thus building the foundations for more advanced topics. The book remains an engineering text, with the goal of helping students solve real-world problems. In this vein, the last chapter pulls together the individual topics as discussed throughout the book into an in-depth look at the development of an end-to-end communication system, namely, a modem for communicating digital information over an analog channel.