CONCEPTION, REALISATION ET CARACTERISATION DE CAPTEURS DE PUISSANCE MICRO-ONDE. DEVELOPPEMENT D'UN OUTIL DE MODELISATION NUMERIQUE EN ONDELETTES DE PHENOMENES THERMIQUES RELATIFS A CES COMPOSANTS PDF Download

Author: ARMELLE.. DAULLE
Publisher:
ISBN:
Category :
Languages : fr
Pages : 306

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Book Description
LE TRAVAIL PRESENTE DANS CE MEMOIRE SE COMPOSE DE DEUX ETUDES REALISEES CONJOINTEMENT ET DE FACON COMPLEMENTAIRE. LA PREMIERE CONCERNE LA CONCEPTION ET LA CARACTERISATION DE DEUX CAPTEURS DE PUISSANCE MICRO-ONDE DONT LE FONCTIONNEMENT EST BASE SUR LA CONVERSION DE L'ENERGIE HAUTE FREQUENCE EN CHALEUR. L'UN, DESTINE A DES MESURES RAPIDES DE SIGNAUX DE TELECOMMUNICATIONS, MET A PROFIT LA GRANDE SENSIBILITE THERMOMETRIQUE DES COUCHES MINCES DE NITRURE DE NIOBIUM. LA MESURE DE LA PUISSANCE SE FAIT SELON UN PRINCIPE DE COMPENSATION. UN TEMPS DE REPONSE DE 2 S, TRES COMPETITIF VIS A VIS DES CAPTEURS A DIODES, A ETE OBTENU DANS LA GAMME DE PUISSANCE + 10 DBM ; +28 DBM ET A DES FREQUENCES DE L'ORDRE DU GIGAHERTZ. L'AUTRE, DESTINE A DES MESURES DE PUISSANCES MOYENNES, UTILISE UN ELEMENT SENSIBLE REALISE EN COUCHE MINCE METALLIQUE TAPERISEE. SON PRINCIPE DE FONCTIONNEMENT N'A, A NOTRE CONNAISSANCE, JAMAIS ETE EXPERIMENTE POUR LA MESURE DE PUISSANCE MICRO-ONDE DANS LES STRUCTURES PLANAIRES. CES CAPTEURS ONT POUR POINT COMMUN LE COUPLAGE ELECTROMAGNETIQUE/THERMIQUE, QUI PEUT GENERER NON-LINEARITES, POINTS CHAUDS, REGIMES TRANSITOIRES RAPIDES ET DERIVES THERMIQUES LENTES. DANS LE BUT DE DETECTER CES PHENOMENES SIMULTANES MAIS D'ECHELLES TRES DIFFERENTES, NOUS AVONS DEVELOPPE UN OUTIL DE MODELISATION NUMERIQUE PAR ONDELETTES, UTILISANT LA METHODE DE GALERKIN EN DEUX DIMENSIONS. LA SECONDE PARTIE DE CE MEMOIRE EST CONSACREE A LA DESCRIPTION DES DIFFERENTES VERSIONS DE NOTRE ALGORITHME ET DE SA MISE EN UVRE NUMERIQUE. DEVELOPPE, TESTE ET MIS AU POINT SUR UN CAS FICTIF D'ELECTROMAGNETISME, LE PROGRAMME A ENSUITE ETE ADAPTE A LA RESOLUTION DE DEUX PROBLEMES THERMIQUES RELATIFS A NOS CAPTEURS.

Author: MICHAEL.. BOUTBOUL
Publisher:
ISBN:
Category :
Languages : fr
Pages : 183

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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.

Author: Philippe Gourbesville
Publisher: Springer
ISBN: 9812876154
Category : Science
Languages : en
Pages : 616

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This book is a collection of extended papers based on presentations given during the SIMHYDRO 2014 conference, held in Sophia Antipolis in June 2014. It focuses on the modeling and simulation of fast hydraulic transients, on 3D modeling, and on uncertainties and multiphase flows. The book explores both the limitations and performance of current models and presents the latest developments based on new numerical schemes, high-performance computing, multiphysics and multiscale methods, and better interaction with field or scale model data. It addresses the interests of practitioners, stakeholders, researchers and engineers active in this field.

Author: Paolo Mele
Publisher:
ISBN: 9781536160864
Category : Zinc oxide thin films
Languages : en
Pages : 0

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Book Description
Zinc oxide (ZnO) is an n-type semiconductor with versatile applications such as optical devices in ultraviolet region, piezoelectric transducers, transparent electrode for solar cells and gas sensors. This book "ZnO Thin Films: Properties, Performance and Applications" gives a deep insight in the intriguing science of zinc oxide thin films. It is devoted to cover the most recent advances and reviews the state of the art of ZnO thin films applications involving energy harvesting, microelectronics, magnetic devices, photocatalysis, photovoltaics, optics, thermoelectricity, piezoelectricity, electrochemistry, temperature sensing. It serves as a fundamental information source on the techniques and methodologies involved in zinc oxide thin films growth, characterization, post-deposition plasma treatments and device processing. This book will be invaluable to the experts to consolidate their knowledge and provide insight and inspiration to beginners wishing to learn about zinc oxide thin films.

Author: Rebecca Hampl
Publisher: Christian Faith Publishing, Inc.
ISBN: 1098051017
Category : Fiction
Languages : en
Pages : 533

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Book Description
At the age of twenty-eight, Marty Ellis is still a bachelor who graduated with a major in journalism and a minor in photojournalism. He enjoys his life with various girlfriends while knocking back drinks in bars, going out to dinner, and rolling in the sheets. Yet inevitably, he grows tired of these surface-level-only feelings, shells out his standard goodbye speech, and moves on. However, using only his body and saying sayonara to his love lifeaEUR(tm)s revolving door is not how he wants to live for the rest of his life. How will he ever know what true love feels like if he doesnaEUR(tm)t ascertain how to actually give it? In what way will he begin to be able to discover the whole package that runs beneath the surface of a woman? Unexpectedly, Marty is blindsided when his best friend invites him to leave New Jersey for a weekend trip. Lauren Morris is a beautiful thirty-two-year-old woman who, after graduating at the age of twenty-one with a masteraEUR(tm)s degree in business, took a huge leap of faith and purchased an old farmhouse in Vermont. After ten years of hard work and sweat equity, she has transformed it into a beautiful inn that has become extremely lucrative. But winter is fast approaching, and she is dreading that feeling of loneliness that is connected to darkened afternoons and long, empty nights. Will a man ever enter her life? One that she could love and perhaps be with until death due them part? After meeting Marty, Lauren begins to consider if this man might be the one she has been waiting for her whole life. But then again, she is older than he is; long distance relationships hardly ever work out; and sudden heartbreaking unforeseen events rock both of their worlds. And if they do fall in love, which one of them will have to make the ultimate sacrifice and give up what theyaEUR(tm)ve worked so hard to achieve in order to be together? With so many changes causing so many challenges, will they get through them together, or will one push the other away?

Author: Petar Stankov
Publisher: Routledge
ISBN: 100020071X
Category : Business & Economics
Languages : en
Pages : 94

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The Political Economy of Populism explores the interplay between identity, the economy and inequality to explain the dynamics of populist votes since the beginning of the 20th century. The book discusses the political and economic implications of populist governance using data on populist incumbencies and linking it to historical data on the macro economy and democracy. Chapters draw from the most recent political science, economics and other social science literature, as well as historical data, to explain the long-term causes and consequences of populism. Populism emerges and gains traction when political entrepreneurs exploit underlying identity conflicts for political gains. As the distributional consequences of both economic distress and economic growth typically favor the elite over the poor and the lower middle class, economic shocks usually sharpen the underlying identity conflicts between the groups. The book provides evidence of significant differences in the ways fiscal and monetary policies are conducted by incumbent populists in Latin America, Europe and the OECD. The work concludes by suggesting avenues through which a 21st century social consensus can be built, so that our society can avoid repeating the mistakes that led to wars and failed economic experiments in the 20th century. The Political Economy of Populism marks a significant contribution to the study of populism and is suited to students and scholars across the social sciences, including economics, political science and sociology.

Author: Dr. Reinaldo J. Perez
Publisher: John Wiley & Sons
ISBN: 1119082781
Category : Science
Languages : en
Pages : 768

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Book Description
A comprehensive resource that explores electromagnetic compatibility (EMC) for aerospace systems Handbook of Aerospace Electromagnetic Compatibility is a groundbreaking book on EMC for aerospace systems that addresses both aircraft and space vehicles. With contributions from an international panel of aerospace EMC experts, this important text deals with the testing of spacecraft components and subsystems, analysis of crosstalk and field coupling, aircraft communication systems, and much more. The text also includes information on lightning effects and testing, as well as guidance on design principles and techniques for lightning protection. The book offers an introduction to E3 models and techniques in aerospace systems and explores EMP effects on and technology for aerospace systems. Filled with the most up-to-date information, illustrative examples, descriptive figures, and helpful scenarios, Handbook of Aerospace Electromagnetic Compatibility is designed to be a practical information source. This vital guide to electromagnetic compatibility: • Provides information on a range of topics including grounding, coupling, test procedures, standards, and requirements • Offers discussions on standards for aerospace applications • Addresses aerospace EMC through the use of testing and theoretical approaches Written for EMC engineers and practitioners, Handbook of Aerospace Electromagnetic Compatibility is a critical text for understanding EMC for aerospace systems.