Définition, réalisation et caractérisation de matériaux à bandes photoniques interdites reconfigurables en micro-ondes PDF Download
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Author: Thierry Brillat
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Author: Thierry Brillat
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Author: VANBESIEN Olivier
Publisher: Lavoisier
ISBN: 2746281376
Category :
Languages : en
Pages : 386
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Book Description
Ce livre propose une synthèse des recherches - des concepts jusqu'aux applications - sur les matériaux artificiels, incluant les cristaux photoniques et les métamatériaux. Il expose les enjeux de performance et les défis de fabrication (jusqu'à l'échelle du nanomètre) pour l'exploitation des effets d'ultra-réfraction ou de réfraction négative induits par l'ingénierie généralisée ou localisée de la dispersion sur l'ensemble du spectre électromagnétique (des micro-ondes à l'optique en passant par le térahertz et l'infrarouge). Didactique, Matériaux artificiels analyse les possibilités de l'optique de transformation tels que les mirages optiques, les lentilles parfaites, les tapis magiques et les capes d'invisibilité. Présentés comme potentiels précurseurs de nouveaux systèmes de contrôle de la propagation des ondes et/ou d'imagerie pour les domaines des télécommunications, de la biologie ou de la médecine, ils permettent d'identifier les principaux verrous théoriques et technologiques actuels.
Author: FREDERIQUE.. GADOT
Publisher:
ISBN:
Category :
Languages : fr
Pages : 155
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Book Description
LES MATERIAUX A BANDES INTERDITES PHOTONIQUES (BIP) SONT DES MATERIAUX DE GEOMETRIE PERIODIQUE QUI PERMETTENT DE REFLECHIR OU DE TRANSMETTRE LES ONDES ELECTROMAGNETIQUES DANS CERTAINES GAMMES DE FREQUENCES. CES DOMAINES DE FREQUENCE PEUVENT ETRE CONTROLES EN AJUSTANT LES PARAMETRES DE LA STRUCTURE TELS LE PAS, LE TYPE DE RESEAU OU LE MATERIAU. LES STRUCTURES ETUDIEES DURANT CETTE THESE SONT BIDIMENSIONNELLES DIELECTRIQUES ET METALLIQUES. ELLES SONT CONSTRUITES AVEC DES TIGES CYLINDRIQUES DE CUIVRE OU D'ALUMINE SUIVANT DES RESEAUX CARRE, TRIANGULAIRE ET HEXAGONAL. LES MESURES EXPERIMENTALES DE LEUR DIAGRAMME DE TRANSMISSION ENTRE 8-16 GHZ ET 27-80 GHZ ONT PERMIS D'ANALYSER L'INFLUENCE DU TAUX DE REMPLISSAGE, DU NOMBRE DE COUCHES NECESSAIRE A LA CREATION DE BANDES INTERDITES ET DES DEFAUTS. LES DIAGRAMMES DE TRANSMISSION DES CRISTAUX ONT ETE CALCULES A L'AIDE DE LA METHODE FDTD. CES SIMULATIONS ONT TOUJOURS ETE EN EXCELLENT ACCORD AVEC LES MESURES. CETTE METHODE DE MODELISATION PERMET EGALEMENT DE VISUALISER LA CARTOGRAPHIE DES CHAMPS ELECTROMAGNETIQUES A L'INTERIEUR DU CRISTAL. L'ETUDE CONCLUANTE SUR CES MATERIAUX AVEC OU SANS DEFAUTS A CONTINUE AVEC L'ASSOCIATION DE DIFFERENTS BIPS, CE QUI DONNE LA POSSIBILITE D'ACCROITRE FORTEMENT LA LARGEUR DE BANDE INTERDITE TOUT EN OUVRANT DES FENETRES DE TRANSMISSION DANS CETTE BANDE ELARGIE LORSQUE DES DEFAUTS Y SONT INTRODUITS.
Author: Agnes Buka
Publisher: World Scientific
ISBN: 1848167997
Category : Science
Languages : en
Pages : 299
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Book Description
The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Author: Jerome V. Moloney
Publisher: Springer Science & Business Media
ISBN: 9780387985817
Category : Business & Economics
Languages : en
Pages : 270
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Book Description
Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
Author: Georgios B. Giannakis
Publisher: John Wiley & Sons
ISBN: 047146287X
Category : Technology & Engineering
Languages : en
Pages : 488
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Book Description
Eine vielversprechende Technologie zur Maximierung der Bandbreiteneffizienz in der breitbandigen drahtlosen Kommunikation ist die Raum-Zeit-Kodierung. Theorie und Praxis verbindend, ist dieses Buch die erste umfassende Diskussion von Grundlagen und designorientierten Aspekten von Raum-Zeit-Codes. Single-Carrier und Multi-Carrier-Übertragungen für Einzel- und Mehrnutzerkommunikation werden behandelt.
Author: Miroslav Chomat
Publisher: BoD – Books on Demand
ISBN: 9533075481
Category : Technology & Engineering
Languages : en
Pages : 278
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Book Description
The subject of this book is an important and diverse field of electric machines and drives. The twelve chapters of the book written by renowned authors, both academics and practitioners, cover a large part of the field of electric machines and drives. Various types of electric machines, including three-phase and single-phase induction machines or doubly fed machines, are addressed. Most of the chapters focus on modern control methods of induction-machine drives, such as vector and direct torque control. Among others, the book addresses sensorless control techniques, modulation strategies, parameter identification, artificial intelligence, operation under harsh or failure conditions, and modelling of electric or magnetic quantities in electric machines. Several chapters give an insight into the problem of minimizing losses in electric machines and increasing the overall energy efficiency of electric drives.
Author: David Adler
Publisher: Springer Science & Business Media
ISBN: 1489922601
Category : Science
Languages : en
Pages : 448
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Book Description
The Institute for Amorphous Studies was founded in 1982 as the international center for the investigation of amorphous mate rials. It has since played an important role in promoting the und er standing of disordered matter in general. An Institute lecture series on "Fundamentals of Amorphous Materials and Devices" was held during 1982-83 with distinguished speakers from universities and industry. These events were free and open to the public ,and were attended by many representatives of the scientific community. The lectures themselves were highly successful inasmuch as they provided not only formal instruction but also an opportunity for vigorous and stimulating debate. That last element could not be captured within the pages of a book I but the lectures concentrated on the latest advances in the field I which is why their essential contents are he re reproduced in collective form. Together they constitute an interdisciplinary status report of the field. The speakers brought many different viewpoints and a variety of back ground experiences io bear on the problems involved I but though language and conventions vary I the essential unity of the concerns is very clear I as indeed are the ultimate benefits of the many-sided approach.
Author: F Lasnier
Publisher: CRC Press
ISBN: 9780852743119
Category : Science
Languages : en
Pages : 576
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Book Description
The Photovoltaic Engineering Handbook is the first book to look closely at the practical problems involved in evaluating and setting up a photovoltaic (PV) power system. The author's comprehensive knowledge of the subject provides a wealth of theoretical and practical insight into the different procedures and decisions that designers need to make. Unique in its coverage, the book presents technical information in a concise and simple way to enable engineers from a wide range of backgrounds to initiate, assess, analyze, and design a PV system. It is beneficial for energy planners making decisions on the most appropriate system for specific needs, PV applications engineers, and anyone confronting the practical difficulties of setting up a PV power system.
Author: Rentsen Enkhbat
Publisher: Springer Nature
ISBN: 303141229X
Category : Mathematics
Languages : en
Pages : 202
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Book Description
This volume gathers selected, peer-reviewed works presented at the 7th International Conference on Optimization, Simulation and Control, ICOSC 2022, held at the National University of Mongolia, Ulaanbaatar, June 20–22, 2022. Topics covered include (but are not limited to) mathematical programming; network, global, linear, nonlinear, parametric, stochastic, and multi-objective optimization; control theory; biomathematics; and deep and machine learning, to name a few. Held every three years since 2002, the ICOSC conference has become a traditional gathering for experienced and young researchers in optimization and control to share recent findings in these fields and discuss novel applications in myriad sectors. Researchers and graduate students in the fields of mathematics, engineering, and computer science can greatly benefit from this book, which can also be enjoyed by advanced practitioners in research laboratories and the industry. The 2022 edition of the ICOSC conference was sponsored by the Mongolian Academy of Sciences, the National University of Mongolia and the German-Mongolian Institute for Resources and Technology.
