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Etude De Dispositifs Passifs Microondes En Technologie A Haute Temperature Critique
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Book Synopsis ETUDE DE DISPOSITIFS PASSIFS MICROONDES EN TECHNOLOGIE A HAUTE TEMPERATURE CRITIQUE by : DANIEL.. LADRET
Download or read book ETUDE DE DISPOSITIFS PASSIFS MICROONDES EN TECHNOLOGIE A HAUTE TEMPERATURE CRITIQUE written by DANIEL.. LADRET and published by . This book was released on 1995 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE TRAVAIL EXPOSE REPOSE SUR LA CONNAISSANCE PRAGMATIQUE DES PROPRIETES DES SUPRACONDUCTEURS A HAUTE TEMPERATURE CRITIQUE (HTC) ET SUR LES METHODES DE MODELISATION DEVELOPPEES AU LEMO ; IL EST POSSIBLE, SUR DES STRUCTURES PLANAIRES MICROONDES, DE PRENDRE EN COMPTE LES PARTICULARITES DES MATERIAUX HTC. NOUS MONTRONS ET COMMENTONS LES EFFETS PROPRES DU SUPRACONDUCTEUR AINSI QUE LES EFFETS INDUITS PAR DES METALLISATIONS PROCHES, NOUS AVONS CONCU ET REALISE UN CIRCUIT PASSIF MICROONDE ORIGINAL. L'INDUCTANCE INTERNE A ETE ETUDIEE EN COMPARANT LES RESULTATS DE MODELISATION A CEUX ISSUS DE TESTS SUR UNE LIGNE MICRORUBAN INVERSEE. NOUS MONTRONS UNE BONNE CONCORDANCE DES RESULTATS JUSQU'A 0,98 TC. LES EFFETS INDUITS SUR LES PERTES ET LA VITESSE DE PHASE PAR DES METALLISATIONS DE PROXIMITE ONT ETE ANALYSES. LES RESULTATS PRESENTES COMPARENT LES VALEURS MODELISEES A DES DONNEES EXPERIMENTALES SUR DES LIGNES COPLANAIRES. NOUS NOUS SOMMES PLUS PARTICULIEREMENT INTERESSES AU CAS D'UNE COUCHE SUPRACONDUCTRICE RECOUVERTE D'UN METAL (BILAME) ET NOUS VALIDONS NOTRE MODELISATION JUSQU'A 30 GHZ. LE COMPORTEMENT DES PERTES EN FONCTION DE LA FREQUENCE EST EXPLIQUE GRACE A L'ETUDE SUR LE BILAME MICRORUBAN. L'ETUDE D'UN DISPOSITIF A DISPERSION CONTROLEE A ETE CONDUITE. CE CIRCUIT EST CONSTITUE D'UNE SUITE DE COUPLEURS MICROONDES MIS EN CASCADE. DANS LE BUT DE REALISER UN CIRCUIT EN MATERIAUX HTC, LA TECHNOLOGIE UTILISEE EST COPLANAIRE COUPLEE ; ELLE PERMET DE S'AFFRANCHIR DES CONTRAINTES TECHNOLOGIQUES ACTUELLES. LA CONCEPTION ET LA REALISATION D'UN DEMONSTRATEUR PERMET DE VALIDER NOS SIMULATIONS, DANS LES DOMAINES TEMPOREL ET FREQUENTIEL EN TENANT COMPTE D'EFFETS PERTURBATEURS ENDEMIQUES ; ET NOUS MONTRONS QU'UN DISPOSITIF FONCTIONNEL NE PEUT ETRE REALISE QU'A PARTIR D'UNE TECHNOLOGIE SUPRACONDUCTRICE
Book Synopsis Etude de dispositifs passifs microondes en technologie supraconductrice à haute température critique by : Daniel Ladret (auteur en optoélectronique).)
Download or read book Etude de dispositifs passifs microondes en technologie supraconductrice à haute température critique written by Daniel Ladret (auteur en optoélectronique).) and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Supraconducteurs à haute température critique by : Pierre Lepercq
Download or read book Supraconducteurs à haute température critique written by Pierre Lepercq and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail concerne, d'une part la mise au point d'une methode de caracterisation en micro-ondes des materiaux supraconducteurs a haute temperature critique (shtc), et d'autre part leur emploi dans la realisation d'oscillateurs micro-ondes quasi-integres. L'impedance de surface des materiaux shtc est un parametre de premiere importance car elle est un indicateur de la qualite du materiau et conditionne les performances des circuits micro-ondes supraconducteurs. Il est donc essentiel de connaitre de parametre. Dans cette optique, nous avons developpe une methode de mesure non-destructrice de la resistance de surface des films shtc permettant des caracterisations de routine de 300k a 78k. Cette methode consiste a remplacer une paroi d'une cavite resonante metallique par l'echantillon supraconducteur a caracteriser, la mesure du coefficient de qualite permet d'aboutir a la resistance de surface. Nous presentons l'etude detaillee de cette methode, les dispositifs de mesure realises, l'application de la methode a la caracterisation de films shtc ainsi que les limites de mesure. La faible resistance de surface des films shtc permet de realiser des resonateurs plaques a tres haut coefficient de qualite, et donc de concevoir des oscillateurs micro-ondes en technologie plaquee a haute purete spectrale. Ainsi nous avons etudie des oscillateurs hybrides shtc/iii-v fonctionnant a 12ghz. Le resonateur ainsi que toutes les lignes du circuit sont gravees sur un film supraconducteur ybacuo. Le transistor de type hemt est transplante sur les lignes supraconductrices afin de realiser un oscillateur quasi-integre.
Book Synopsis CONCEPTION, MODELISATION ET CARACTERISATION DE COMPOSANTS PASSIFS MICRO-ONDES A BASE DE MICRORUBANS SUPRACONDUCTEURS by : MICHAEL.. BOUTBOUL
Download or read book CONCEPTION, MODELISATION ET CARACTERISATION DE COMPOSANTS PASSIFS MICRO-ONDES A BASE DE MICRORUBANS SUPRACONDUCTEURS written by MICHAEL.. BOUTBOUL and published by . This book was released on 1999 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: EN VUE DE REALISER L'ACCORD EN FREQUENCE D'UN COMPOSANT MICRO-ONDE SUPRACONDUCTEUR A HAUTE TEMPERATURE CRITIQUE NOUS AVONS REALISE LES TRAVAUX SUIVANTS : UNE MODELISATION MATRICIELLE, UNE CARACTERISATION EN TEMPERATURE ET EN PUISSANCE, ET UNE ETUDE DE L'ACCORDABILITE OPTIQUE. NOUS AVONS DEVELOPPE UNE MODELISATION POUR DES LIGNES EN YBACUO ET NOUS AVONS SIMULE LES PARAMETRES S DE COMPOSANTS MICRORUBAN A L'AIDE D'UNE METHODE MATRICIELLE. CETTE METHODE A ETE VALIDEE EN COMPARANT LES MESURES REALISEES SUR UN FILTRE PASSE-BAS DE CHEBYCHEV EN YBACUO (TC = 90 K) AVEC LA SIMULATION SUR UNE GAMME DE FREQUENCE ALLANT DE 2 A 7 GHZ ET POUR DES TEMPERATURES DE 60 K ET 89 K. DE PLUS, UNE COMPARAISON ENTRE LES PERFORMANCES D'UN FILTRE DE MEME GEOMETRIE GRAVEE DANS UNE COUCHE D'OR ET LE FILTRE EN YBACUO A MONTRE LES AVANTAGES DU FILTRE SUPRACONDUCTEUR SUR SON EQUIVALENT METALLIQUE. DES RESONATEURS LINEAIRES EN YBACUO ONT ETE CARACTERISES AVEC DES MESURES MICRO-ONDES EN TRANSMISSION EN FONCTION DE LA TEMPERATURE ET DE LA PUISSANCE MICRO-ONDE. CETTE ETUDE A MONTRE QUE LES CARACTERISTIQUES NON LINEAIRES DU COMPOSANT SUPRACONDUCTEUR EVOLUENT DE MANIERE DIFFERENTE SUIVANT TROIS REGIONS DE LA TEMPERATURE. CES REGIONS ONT ETE ATTRIBUEES A LA DEPENDANCE DE LA RESISTANCE DE SURFACE AVEC LA TEMPERATURE, NOTAMMENT LA RESISTANCE DES JOINTS DE GRAINS ET LA PENETRATION DES VORTEX JOSEPHSON DANS LES LIENS FAIBLES. L'ACCORDABILITE EN FREQUENCE DU RESONATEUR EN YBACUO A ETE REALISEE A L'AIDE D'UNE ILLUMINATION DU COMPOSANT DANS LES DOMAINES VISIBLE ET INFRAROUGE. UN DEPLACEMENT DE RESONANCE DE 4 MHZ A ETE OBTENU AVEC UN FAISCEAU VISIBLE DE 200 MW PROVENANT D'UN LASER A ARGON CONTINU. L'EFFET A ETE ATTRIBUE A DES PHENOMENES THERMIQUES. LA METHODE MATRICIELLE A PERMIS D'EVALUER L'ELEVATION LOCALE DE LA TEMPERATURE ET UNE APPROCHE BOLOMETRIQUE A CONFIRME LE RESULTAT LORSQU'IL EST TENU COMPTE DE LA RESISTANCE THERMIQUE DE L'INTERFACE METAL/METAL DU PLAN DE MASSE AVEC LE BOITIER.
Book Synopsis Étude comparative de l'approche dans le domaine spectral et d'une formulation par éléments finis pour la simulation des dispositifs microondes et optroniques by : Didier Kinowski
Download or read book Étude comparative de l'approche dans le domaine spectral et d'une formulation par éléments finis pour la simulation des dispositifs microondes et optroniques written by Didier Kinowski and published by . This book was released on 1992 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'objectif initial de notre travail consistait à définir les potentialités d'application de films supraconducteurs à haute température critique, lors de la réalisation de dispositifs microondes. Chiffrer l'apport d'un ruban supraconducteur par rapport à une métallisation classique nous impose de prendre en considération les dimensions effectives des rubans. Ce constat nous a amené à développer des méthodes de simulation qui font abstraction de la notion de calcul de perturbation. Deux démarches ont éte retenues : la première repose sur la modification et l'extension de l'approche dans le domaine spectral, la seconde s'appuie sur une formulation par éléments finis. La première partie de ce mémoire rappelle les principales phases de la mise en œuvre de l'approche dans le domaine spectral. Dans cette analyse, la prise en compte simultanée de la conductivité des rubans et de leur épaisseur nécessite l'introduction de la notion d'impédance de surface. Dans le deuxième chapitre, après avoir mis en évidence les insuffisances de logiciels professionnels dès que l'on cherche à quantifier les pertes d'insertion de lignes plaquées, nous proposons une méthode de détermination systématique et fiable de ces pertes, à partir de l'approche dans le domaine spectral, se démarquant des méthodes classiques de perturbation. En premier lieu, nous testons la fiabilité de notre formalisme par rapport aux relevés expérimentaux effectués sur des lignes métalliques classiques. Nous abordons ensuite une étude prospective visant à définir les potentialités d'application des matériaux supraconducteurs lors de la réalisation de circuits passifs, et ce, en considérant des structures microrubans et coplanaires. Afin d'appréhender des structures de topologies plus complexes, pour lesquelles l'approche dans le domaine spectral ne peut apporter que des réponses partielles, nous avons développé et présenté dans la troisième partie une analyse de type éléments finis. Dans la formulation retenue, les six composantes de champ sont approximées, sur un élément, par une interpolation nodale classique. Cette méthode constitue un moyen pour assurer l'élimination des solutions parasites. Les différents tests effectués pour éprouver la fiabilité de notre algorithme sont présentés dans le quatrième chapitre. Procédant par étapes successives, nous avons appliqué ce formalisme à des structures de complexité croissante, pour aboutir finalement à l'analyse du comportement d'un modulateur électrooptique réalisé sur niobate de lithium
Book Synopsis Conception, realisation et caracterisation de composants passifs microondes supraconducteurs a haute temperature critique by : Emmanuelle Husse
Download or read book Conception, realisation et caracterisation de composants passifs microondes supraconducteurs a haute temperature critique written by Emmanuelle Husse and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Book Synopsis Precision Measurement and Fundamental Constants; Proceedings by : United States. National Bureau of Standards
Download or read book Precision Measurement and Fundamental Constants; Proceedings written by United States. National Bureau of Standards and published by . This book was released on 1971 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Passive Microwave Device Applications of High Temperature Superconductors by : M. J. Lancaster
Download or read book Passive Microwave Device Applications of High Temperature Superconductors written by M. J. Lancaster and published by . This book was released on 1997 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book on applications of high temperature superconductors in electrical engineering.
Book Synopsis Quantum Mechanics, Volume 3 by : Claude Cohen-Tannoudji
Download or read book Quantum Mechanics, Volume 3 written by Claude Cohen-Tannoudji and published by John Wiley & Sons. This book was released on 2019-12-16 with total page 790 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
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)
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.
Book Synopsis Generation and Application of High Power Microwaves by : R.A Cairns
Download or read book Generation and Application of High Power Microwaves written by R.A Cairns and published by CRC Press. This book was released on 2020-08-18 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written at the graduate level, Generation and Application of High Power Microwaves discusses the basic physics of the generation of microwave and radiofrequency waves in the megawatt power range and the application of these ideas to a range of devices such as klystrons, gyrotrons, and free electron lasers. The book also contains chapters covering the transmission of the power through waveguides and the problems associated with mode conversion in transmission lines. The main application area covered is the heating and current drive in tokamaks and other devices for research into controlled nuclear fusion. Other applications of high power microwave technology are not neglected, and among those discussed are multiple charged ion and soft x-ray sources, electron spin resonance spectroscopy, advanced materials processing, millimeter wave radar, and supercolliders.
Book Synopsis Wireless Power Transmission for Sustainable Electronics by : Nuno Borges Carvalho
Download or read book Wireless Power Transmission for Sustainable Electronics written by Nuno Borges Carvalho and published by John Wiley & Sons. This book was released on 2020-02-19 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a collection of works produced by COST Action IC1301 with the goal of achieving significant advances in the field of wireless power transmission This book constitutes together information from COST Action IC1301, a group of academic and industry experts seeking to align research efforts in the field of wireless power transmission (WPT). It begins with a discussion of backscatter as a solution for Internet of Things (IoT) devices and goes on to describe ambient backscattering sensors that use FM broadcasting for low cost and low power wireless applications. The book also explores localization of passive RFID tags and augmented tags using nonlinearities of RFID chips. It concludes with a review of methods of electromagnetic characterization of textile materials for the development of wearable antennas. Wireless Power Transmission for Sustainable Electronics: COST WiPE - IC1301 covers textile-supported wireless energy transfer, and reviews methods for the electromagnetic characterization of textile materials for the development of wearable antennas. It also looks at: backscatter RFID sensor systems for remote health monitoring; simultaneous localization (of robots and objects) and mapping (SLAM); autonomous system of wireless power distribution for static and moving nodes of wireless sensor networks; and more. Presents techniques for smart beam-forming for "on demand" wireless power transmission (WPT) Discusses RF and microwave energy harvesting for space applications Describes miniaturized RFID transponders for object identification and sensing Wireless Power Transmission for Sustainable Electronics: COST WiPE - IC1301 is an excellent book for both graduate students and industry engineers involved in wireless communications and power transfer, and sustainable materials for those fields.
Book Synopsis Quantum Transport by : Yuli V. Nazarov
Download or read book Quantum Transport written by Yuli V. Nazarov and published by Cambridge University Press. This book was released on 2009-05-28 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum transport is a diverse field, sometimes combining seemingly contradicting concepts - quantum and classical, conduction and insulating - within a single nanodevice. Quantum transport is an essential and challenging part of nanoscience, and understanding its concepts and methods is vital to the successful fabrication of devices at the nanoscale. This textbook is a comprehensive introduction to the rapidly developing field of quantum transport. The authors present the comprehensive theoretical background, and explore the groundbreaking experiments that laid the foundations of the field. Ideal for graduate students, each section contains control questions and exercises to check readers' understanding of the topics covered. Its broad scope and in-depth analysis of selected topics will appeal to researchers and professionals working in nanoscience.
Author :North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Sensor and Propagation Panel. Symposium Publisher : ISBN 13 : Total Pages :200 pages Book Rating :4.E/5 ( download)
Book Synopsis Analyse de la Signature Radar Et de la Vidéoscopie de Cibles Militaires by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Sensor and Propagation Panel. Symposium
Download or read book Analyse de la Signature Radar Et de la Vidéoscopie de Cibles Militaires written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Sensor and Propagation Panel. Symposium and published by . This book was released on 1997 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wide Area Power Systems Stability, Protection, and Security by : Hassan Haes Alhelou
Download or read book Wide Area Power Systems Stability, Protection, and Security written by Hassan Haes Alhelou and published by Springer Nature. This book was released on 2020-09-21 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book proposes new control and protection schemes to improve the overall stability and security of future wide-area power systems. It focuses on the high penetration levels of renewable energy sources and distributed generation, particularly with the trend towards smart grids. The control methods discussed can improve the overall stability in normal and abnormal operation conditions, while the protection methods presented can be used to ensure the secure operation of systems under most severe contingencies. Presenting stability, security, and protection methods for power systems in one concise volume, this book takes the reader on a journey from concepts and fundamentals to the latest and future trends in each topic covered, making it an informative and intriguing read for researchers, graduate students, and practitioners alike.
Book Synopsis Quantum Communications and Cryptography by : Alexander V. Sergienko
Download or read book Quantum Communications and Cryptography written by Alexander V. Sergienko and published by CRC Press. This book was released on 2018-10-03 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: All current methods of secure communication such as public-key cryptography can eventually be broken by faster computing. At the interface of physics and computer science lies a powerful solution for secure communications: quantum cryptography. Because eavesdropping changes the physical nature of the information, users in a quantum exchange can easily detect eavesdroppers. This allows for totally secure random key distribution, a central requirement for use of the one-time pad. Since the one-time pad is theoretically proven to be undecipherable, quantum cryptography is the key to perfect secrecy. Quantum Communications and Cryptography is the first comprehensive review of the past, present, and potential developments in this dynamic field. Leading expert contributors from around the world discuss the scientific foundations, experimental and theoretical developments, and cutting-edge technical and engineering advances in quantum communications and cryptography. The book describes the engineering principles and practical implementations in a real-world metropolitan network as well as physical principles and experimental results of such technologies as entanglement swapping and quantum teleportation. It also offers the first detailed treatment of quantum information processing with continuous variables. Technologies include both free-space and fiber-based communications systems along with the necessary protocols and information processing approaches. Bridging the gap between physics and engineering, Quantum Communications and Cryptography supplies a springboard for further developments and breakthroughs in this rapidly growing area.
