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Author: Laurent Chéty
Publisher:
ISBN:
Category :
Languages : fr
Pages : 237
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Book Description
LA FINALITE DE CE TRAVAIL EST LA MODELISATION DE L'INTERACTION D'UNE ONDE ELECTROMAGNETIQUE PLANE EN REGIME HARMONIQUE AVEC DES COMPOSANTES SIMPLES D'UNE CIBLE COMPLEXE. CECI DANS LE BUT DE CARACTERISER SOIT LA CONTRIBUTION DE CHAQUE ELEMENT DE LA STRUCTURE AU CHAMP DIFFRACTE, SOIT LE COUPLAGE ENTRE ELEMENTS DISTINCTS. UNE APPLICATION PARTICULIERE CONCERNE LA SURFACE EQUIVALENTE RADAR, MONOSTASTIQUE ET BISTATIQUE, DE CES STRUCTURES. L'UTILISATION D'EQUATIONS INTEGRALES DE SURFACE PERMET D'OBTENIR LES COURANTS ELECTRIQUE ET MAGNETIQUE INDUITS PAR L'ONDE INCIDENTE. CES EQUATIONS INTEGRALES SONT RESOLUES NUMERIQUEMENT PAR LA METHODE DES MOMENTS, POUR LAQUELLE LA SURFACE DES OBJETS, DE FORME QUELCONQUE, EST MODELISEE PAR DES TRIANGLES PLANS. PLUSIEURS TYPES D'OBJET SONT ETUDIES AVEC CETTE METHODE
Author: Laurent Chéty
Publisher:
ISBN:
Category :
Languages : fr
Pages : 237
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Book Description
LA FINALITE DE CE TRAVAIL EST LA MODELISATION DE L'INTERACTION D'UNE ONDE ELECTROMAGNETIQUE PLANE EN REGIME HARMONIQUE AVEC DES COMPOSANTES SIMPLES D'UNE CIBLE COMPLEXE. CECI DANS LE BUT DE CARACTERISER SOIT LA CONTRIBUTION DE CHAQUE ELEMENT DE LA STRUCTURE AU CHAMP DIFFRACTE, SOIT LE COUPLAGE ENTRE ELEMENTS DISTINCTS. UNE APPLICATION PARTICULIERE CONCERNE LA SURFACE EQUIVALENTE RADAR, MONOSTASTIQUE ET BISTATIQUE, DE CES STRUCTURES. L'UTILISATION D'EQUATIONS INTEGRALES DE SURFACE PERMET D'OBTENIR LES COURANTS ELECTRIQUE ET MAGNETIQUE INDUITS PAR L'ONDE INCIDENTE. CES EQUATIONS INTEGRALES SONT RESOLUES NUMERIQUEMENT PAR LA METHODE DES MOMENTS, POUR LAQUELLE LA SURFACE DES OBJETS, DE FORME QUELCONQUE, EST MODELISEE PAR DES TRIANGLES PLANS. PLUSIEURS TYPES D'OBJET SONT ETUDIES AVEC CETTE METHODE
Author: YVES.. LERASLE
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
L'EQUATION INTEGRALE DU CHAMP ELECTRIQUE ECRITE SOUS SA FORME TEMPORELLE EST UTILISEE POUR RESOUDRE LE PROBLEME DE DIFFRACTION D'UNE ONDE ELECTROMAGNETIQUE PAR UNE STRUCTURE DE FORME QUELCONQUE (OUVERTE OU FERMEE) PARFAITEMENT CONDUCTRICE. LA METHODE NUMERIQUE EMPLOYEE POUR EVALUER LA DENSITE DE COURANT INDUITE SUR LA SURFACE DE LA STRUCTURE EST LA METHODE DES MOMENTS. LES FONCTIONS DE BASE ET TEST SPATIALES UTILISEES SONT LES FONCTIONS TRIANGLES DEVELOPPEES PAR RAO (METHODE DE GALERKIN) (1). LES FONCTIONS DE BASE ET TEST TEMPORELLES CHOISIES SONT RESPECTIVEMENT DES FONCTIONS PORTES ET DES DISTRIBUTIONS DE DIRAC (METHODE POINT-SEGMENT). UN ALGORITHME EXPLICITE EST DEVELOPPE; IL CALCULE LES DENSITES DE COURANTS INDUITES TRAVERSANT CHAQUE ARETE DE LA MODELISATION. UN AUTRE ALGORITHME PERMET D'EVALUER LE CHAMP NORMAL A LA STRUCTURE ET EN TOUT POINT DE L'ESPACE. LES CAS TEST ETUDIES SONT CEUX DE LA DIFFRACTION PAR UNE PLAQUE, UN CUBE ET UNE SPHERE. LES RESULTATS SONT EN PARFAIT ACCORD AVEC CEUX OBTENUS PAR D'AUTRES APPROCHES. L'ALGORITHME TEMPOREL DEVELOPPE EST PARTICULIEREMENT ADAPTE A L'ETUDE DES PROBLEMES DE DIFFRACTION EN REGIME TRANSITOIRE
Author: Lan Dau Thi Thuy
Publisher:
ISBN:
Category :
Languages : fr
Pages : 155
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Book Description
L'ANALYSE NON DESTRUCTIVE D'UN MILIEU COMPLEXE OFFRE DES APPLICATIONS MULTIPLES DANS DES DOMAINES AUSSI VARIES QUE L'IMAGERIE MEDICALE, LA TELEDETECTION, LA GEOPHYSIQUE, ETC... LA METHODE UTILISEE CONSISTE EN UNE EXPLORATION DU MILIEU PAR UNE ONDE ELECTROMAGNETIQUE. A PARTIR DU CHAMP DIFFRACTE MESURE SUR UNE SURFACE SITUEE EN ARRIERE DE L'OBJET ON PEUT DETERMINER EN GRANDEUR ET EN POSITION LES CARACTERISTIQUES DU MILIEU TRAVERSE PAR L'ONDE. OR CETTE RECONSTRUCTION SE REVELE UN PROBLEME INVERSE MAL-POSE. UN ALGORITHME DE RECONSTRUCTION QUANTITATIVE, BASE SUR UNE TECHNIQUE STATISTIQUE DITE METHODE A MAXIMUM D'ENTROPIE A ETE CONCU, REALISE ET TESTE. DU POINT DE VUE DU TRAITEMENT DU SIGNAL LE FORMALISME DE MAXIMUM D'ENTROPIE A ETE UTILISE COMME UNE FONCTION DE REGULARISATION NON QUADRATIQUE. C'EST JUSTEMENT CETTE FORTE NON-LINEARITE QUI APPORTE UNE AMELIORATION DE LA RESOLUTION PAR RAPPORT AUX AUTRES METHODES D'INTERPOLATION LINEAIRE. POUR DES APPLICATIONS SPECIFIQUES EN MICROONDES LA METHODE A DU ETRE ETENDUE A LA DEFINITION ET AU TRAITEMENT DE L'ENTROPIE COMPLEXE. CETTE DEMARCHE A ETE RENDUE NECESSAIRE POUR TRAITER LES PROBLEMES DE DIFFRACTION ELECTROMAGNETIQUE QUI PRESENTENT UN CARACTERE COMPLEXE DU A L'EXISTENCE SIMULTANEE D'UNE AMPLITUDE ET D'UNE PHASE. LE PROGRAMME DEVELOPPE A ETE TESTE POUR DES OBJETS DE FORME ET DE NATURE DIFFERENTES, NOTAMMENT CERTAINS ONT PRESENTE UN CARACTERE COMPLEXE. LES RESULTATS MONTRENT QUE CET ALGORITHME SE REVELE PERFORMANT MEME DANS LE CAS DE CHAMPS ELECTROMAGNETIQUES DE FAIBLE AMPLITUDE EN PRESENCE DU BRUIT. LA COMPARAISON AVEC CEUX D'AUTRES AUTEURS A MONTRE UNE PARFAITE SIMILITUDE DANS LES RESULTATS ET UN GAIN DE TEMPS DE CALCUL APPRECIABLE. ENFIN, L'ETUDE A ETE FAITE DE FACON COMPLETE A DEUX DIMENSIONS, L'ETUDE A TROIS DIMENSIONS A ETE ABORDEE MAIS N'A PU ABOUTIR FAUTE DE MOYENS INFORMATIQUES SUFFISAMMENT PUISSANTS
Author: Aymeric Canton
Publisher:
ISBN:
Category :
Languages : fr
Pages : 229
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Book Description
ON ETUDIE LA DIFFRACTION D'ONDES ELECTROMAGNETIQUES PAR DES OBJETS A FACES PLANES INFINIES. LES CONDITIONS AUX LIMITES SUR LA SURFACE DE L'OBJET PEUVENT ETRE DE TYPE CONDUCTEUR PARFAIT OU CONDITION D'IMPEDANCE (POUR LES EQUATIONS DE MAXWELL). EN PARTICULIER, ON S'INTERESSE AU PROBLEME D'HELMHOLTZ POUR LA DIFFRACTION D'UNE ONDE PLANE PAR UN DIEDRE INFINI ; ON MONTRE L'EXISTENCE ET L'UNICITE D'UNE SOLUTION, CONSTRUITE A L'AIDE D'UN CORRECTEUR (LE CHAMP DE L'OPTIQUE PHYSIQUE), DANS UN ESPACE A POIDS APPROPRIE. LA SOLUTION OBTENUE SE DECOMPOSE AISEMENT EN SOMME DE CHAMPS (INCIDENT, REFLECHI ET DIFFRACTE). NUMERIQUEMENT, ON EST ALORS NATURELLEMENT CONDUIT A DEVELOPPER UNE METHODE D'HYBRIDATION QUI COMBINE UNE METHODE INTEGRALE AUX METHODES ASYMPTOTIQUES (OP, TGD, UTD) POUR CALCULER LES COURANTS ELECTRIQUES SUR DES OBJETS 2D ET 3D INFINIS
Author: Claude Cohen-Tannoudji
Publisher: John Wiley & Sons
ISBN: 3527345558
Category : Science
Languages : en
Pages : 790
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Book Description
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: Sébastien Forget
Publisher: Springer
ISBN: 3642367054
Category : Science
Languages : en
Pages : 179
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Book Description
Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.
Author: Olivier Pluchery
Publisher: World Scientific
ISBN: 1800613415
Category : Science
Languages : en
Pages : 356
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Book Description
What is a plasmon? Is it a particle, like a photon or a wave? Plasmonics stands at the frontier of condensed matter physics, which is the world of electrons, optics and of photons. Plasmonics is one of the most active fields in nanophotonics. This book begins by exploring the concepts behind waves, and the electromagnetic description of light when it interacts with metals; it dedicates every chapter thereafter to all aspects of plasmonics. In particular, the surface plasmon polariton wave is explained in full detail, as well as the localized surface plasmon resonance of metallic nanoparticles. The active research area opened by plasmonics, as well as its applications, are also briefly explained, such as advanced biosensing, subwavelength waveguiding, quantum plasmonics, nanoparticle-based cancer therapies, optical nano-antenna and high-efficiency photovoltaic cells.The book is adapted for graduate students and places a special emphasis on providing complete explanations of the fundamental concepts of plasmonics. Further, each of these concepts is illustrated with examples drawn from the most recent scientific literature. Each chapter ends with a set of exercises that will help the reader revise the concepts and go deeper into the world of plasmonics. More than 70 exercises are included.
Author: H. A. Thurston
Publisher: Courier Corporation
ISBN: 0486154947
Category : Mathematics
Languages : en
Pages : 146
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Book Description
This book explores arithmetic's underlying concepts and their logical development, in addition to a detailed, systematic construction of the number systems of rational, real, and complex numbers. 1956 edition.
Author: Anatoliĭ Alekseevich Logunov
Publisher:
ISBN:
Category : Gravitational fields
Languages : en
Pages : 264
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Book Description
Author: Guillermo Carpintero
Publisher: John Wiley & Sons
ISBN: 1118920406
Category : Technology & Engineering
Languages : en
Pages : 408
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Book Description
Key advances in Semiconductor Terahertz (THz) Technology now promises important new applications enabling scientists and engineers to overcome the challenges of accessing the so-called "terahertz gap". This pioneering reference explains the fundamental methods and surveys innovative techniques in the generation, detection and processing of THz waves with solid-state devices, as well as illustrating their potential applications in security and telecommunications, among other fields. With contributions from leading experts, Semiconductor Terahertz Technology: Devices and Systems at Room Temperature Operation comprehensively and systematically covers semiconductor-based room temperature operating sources such as photomixers, THz antennas, radiation concepts and THz propagation as well as room-temperature operating THz detectors. The second part of the book focuses on applications such as the latest photonic and electronic THz systems as well as emerging THz technologies including: whispering gallery resonators, liquid crystals, metamaterials and graphene-based devices. This book will provide support for practicing researchers and professionals and will be an indispensable reference to graduate students in the field of THz technology. Key features: Includes crucial theoretical background sections to photomixers, photoconductive switches and electronic THz generation & detection. Provides an extensive overview of semiconductor-based THz sources and applications. Discusses vital technologies for affordable THz applications. Supports teaching and studying increasingly popular courses on semiconductor THz technology.
