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Etude De Structures Collimatrices En Optique Integree Sur Verre
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Book Synopsis Etude de structures collimatrices en optique intégrée sur verre by : Isabelle Schanen Duport
Download or read book Etude de structures collimatrices en optique intégrée sur verre written by Isabelle Schanen Duport and published by . This book was released on 1992 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: UN CERTAIN NOMBRE DE COMPOSANTS DE L'OPTIQUE DE VOLUME NE SONT PAS TRANSPOSABLES EN OPTIQUE INTEGREE A UNE DIMENSION (COMPOSANTS CONSTITUES DE GUIDES DE LARGEUR LIMITEE). IL S'AGIT DE COMPOSANTS UTILISANT LA DEFLEXION DE LA LUMIERE COMME LES ELEMENTS SPATIALEMENT DISPERSIFS, LES ELEMENTS DE FOCALISATION, LES ELEMENTS DE REFLEXION... LES LENTILLES (ELEMENT DE FOCALISATION ET DE COLLIMATION) EXISTENT DEJA EN OPTIQUE INTEGREE PLANAIRE (A DEUX DIMENSIONS) MAIS NOUS NOUS SOMMES RENDU COMPTE QUE LEUR MISE EN UVRE EST DIFFICILE ET PEU COMPATIBLE AVEC LES CONTRAINTES INDUSTRIELLES. AUSSI AI-JE CHERCHE A REALISER UN ELEMENT DE COLLIMATION (PERMETTANT D'OBTENIR UN FAISCEAU PARALLELE A PARTIR D'UN POINT SOURCE) SIMPLE ET PEU SENSIBLE AUX PARAMETRES TECHNOLOGIQUES. LES TRANSITIONS ADIABATIQUES OU TAPERS EN ANGLAIS PEUVENT ASSURER CETTE FONCTION. LA TECHNOLOGIE EMPLOYEE POUR LEUR FABRICATION EST L'OPTIQUE INTEGREE SUR VERRE PAR ECHANGE D'IONS. UNE TRANSITION PERMETTANT D'OBTENIR UN FAISCEAU PARALLELE D'UNE LARGEUR DE 180 MICRONS A PLUS OU MOINS 5 MICRONS AVEC UN ANGLE DE DIVERGENCE DANS LE VERRE DE 0,16 DEGRE A PLUS OU MOINS 0,03 DEGRE A ETE REALISEE. CES ELEMENTS DE TRANSITION SIMPLES DE REALISATION ET FACILEMENT INDUSTRIALISABLES ONT ETE ASSOCIES DANS UN DISPOSITIF INTERFEROMETRIQUE POUVANT CONDUIRE A DE NOMBREUSES APPLICATIONS
Book Synopsis Étude de la diffusion ionique dans les verres pour l'optique intégrée by : Jérôme Hazart
Download or read book Étude de la diffusion ionique dans les verres pour l'optique intégrée written by Jérôme Hazart and published by . This book was released on 2002 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: La modélisation des processus d'échange d'ions Ag+/Na+ dans les verres alumino-boro-silicates, conduisant à une bonne simulation des procédés de fabrication des structures d'indice utilisées dans le domaine des télécommunications, se heurte actuellement à des difficultés d'ordre expérimental et théorique. En effet, les interactions entre les ions mobiles et la matrice vitreuse suivent des lois de type thermodynamique et électrique. Les paramètres caractérisant la diffusion ionique de ces ions sont nombreux et difficiles à mesurer directement. En outre, l'application d'un champ externe induit des flux ioniques inhomogènes complexes. Nous proposons ici un modèle unifié de diffusion ionique intervenant dans l'échange Ag+/Na+ dans les verres silicates, mêlant les approches thermodynamiques et les approches dites « conductives ». Ce modèle permet de rendre compte des phénomènes observés lors d'analyses structurelles du verre (EXAFS), de mesures de conductivité (« effet alcalin mixte ») et de mesure de coefficient d'interdiffusion. Les paramètres de diffusion sont donnés par une technique d'ajustement sur des profils expérimentaux RNF (Refracted Near Field) de guides d'ondes plans. La modélisation des guides optiques mono et bidimensionnels est en très bon accord avec les profils mesurés expérimentalement. Nous évaluons en outre la stabilité des procédés de fabrication de guides optiques utilisés industriellement dans le domaine des télécommunications optiques. En vue de l'élaboration de réseaux de Bragg, plusieurs méthodes numériques de calcul électromagnétique très récentes de type RCWA (Rigorous Coupled Wave Analysis) sont adaptées au cas des réseaux de Bragg à profils d'indice quelconques. Les performances ultimes de réseaux de Bragg fabriqués par échange d'ions sont évaluées et les modèles de diffusion et de diffraction sont confrontés aux réseaux réalisés. Les réseaux de Bragg sont bien modélisés par nos méthodes. Ceux-ci ont des performances comparables aux performances des réseaux de Bragg réalisés dans les fibres optiques.
Book Synopsis Etude et réalisation de nouvelles fonctions en optique intégrée sur verre pour des applications astrophysiques by : Frédéric Rooms
Download or read book Etude et réalisation de nouvelles fonctions en optique intégrée sur verre pour des applications astrophysiques written by Frédéric Rooms and published by . This book was released on 2003 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: IN THIS WORK, WE ARE INTERESTED IN INTEGRATED OPTICS BEAM COMBINERS FOR ASTRONOMICAL USES. THE STUDY OF THE ASTRONOMICALS SYSTEM'S NEEDS AND THE STATE OF THE ART HAS LED US TO PROPOSE A SOLUTION BASED ON THE MULTI-MODE INTERFERENCE. THIS STRUCTURE HAS BEEN REALIZED BY THE ION EXCHANGE IN GLASS. THE STRUCTURED DESIGN IS BASED ON THE USE OF EXISTING TOOLS LIKE THE BEAM PROPAGATION METHOD AND ALSO THE DEVELOPMENT O F NEW SOFTWARES ADAPTED TO THE ASTRONOMICAL CASE. VARIOUS CHARACTERIZATION METHODS HAVE BEEN DEVELOPPED TO STUDY THE COMPONENT PERFORMANCES. BEYOND CLASSICAL TOOLS LIKE CUT-OFF OR SPECTRAL ANALYSIS, NEW SETUPS HAVE BEEN APPLIED. CHARACTERIZATIONS SHOW THAT THIS KIND OF STRUCTURE FULFILLS THE NEED FOR THE BEAM COMBINATION OF FOUR TELESCOPES. INDEED, FRINGES ARE CREATED AND THE MEASURE OF THE PHASE CLOSURE WITH A LASER IS EXCELLENT. HOWEVER, THE HIGH LEVEL LOSSES NECESSITATES A CHANGE OF ION EXCHANGED COUPLE.
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.
Book Synopsis Dynamic Behavior of Materials, Volume 1 by : Bo Song
Download or read book Dynamic Behavior of Materials, Volume 1 written by Bo Song and published by Springer. This book was released on 2015-10-23 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic Behavior of Materials, Volume 1 represents the first of nine volumes of technical papers presented at the Society for Experimental Mechanics SEM 15th International Congress & Exposition on Experimental and Applied Mechanics, held at Costa Mesa, California, June 8-11, 2015. The full set of proceedings also includes volumes on: Challenges in Mechanics of Time Dependent Materials, Advancement of Optical Methods in Experimental Mechanics, Experimental and Applied Mechanics 16th International Symposium on MEMS and Nanotechnology, 5th International Symposium on the Mechanics of Biological Systems and Materials, International Symposium on the Mechanics of Composite and Multi-functional Materials, Fracture, Fatigue, Failure and Damage Evolution; and Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems.
Author :International Atomic Energy Agency Publisher :International Atomic Energy Agency ISBN 13 :9789201063205 Total Pages :72 pages Book Rating :4.0/5 (632 download)
Book Synopsis In-Vessel Melt Retention and Ex-Vessel Corium Cooling: IAEA Tecdoc No. 1906 by : International Atomic Energy Agency
Download or read book In-Vessel Melt Retention and Ex-Vessel Corium Cooling: IAEA Tecdoc No. 1906 written by International Atomic Energy Agency and published by International Atomic Energy Agency. This book was released on 2020-08-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Download or read book Color Television Receivers written by and published by . This book was released on 1978 with total page 12 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.
Book Synopsis The Art of Being a Parasite by : Claude Combes
Download or read book The Art of Being a Parasite written by Claude Combes and published by University of Chicago Press. This book was released on 2020-06-05 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Parasites are a masterful work of evolutionary art. The tiny mite Histiostoma laboratorium, a parasite of Drosophila, launches itself, in an incredible display of evolutionary engineering, like a surface-to-air missile at a fruit fly far above its head. Gravid mussels such as Lampsilis ventricosa undulate excitedly as they release their parasitic larval offspring, conning greedy predators in search of a tasty meal into hosting the parasite. The Art of Being a Parasite is an extensive collection of these and other wonderful and weird stories that illuminate the ecology and evolution of interactions between species. Claude Combes illustrates what it means to be a parasite by considering every stage of its interactions, from invading to reproducing and leaving the host. An accessible and engaging follow-up to Combes's Parasitism, this book will be of interest to both scholars and nonspecialists in the fields of biodiversity, natural history, ecology, public health, and evolution.
Book Synopsis A New Astronomy by : David Peck Todd
Download or read book A New Astronomy written by David Peck Todd and published by . This book was released on 1906 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Political Parties in Africa by : Sebastian Elischer
Download or read book Political Parties in Africa written by Sebastian Elischer and published by Cambridge University Press. This book was released on 2013-09-09 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the effects of ethnicity on party politics in ten African countries. Sebastian Elischer finds that five party types exist: the mono-ethnic, the ethnic alliance, the catch-all, the programmatic, and the personalistic party. He uses these party types to show that the African political landscape is considerably more diverse than conventionally assumed.
Book Synopsis Beyond State Failure and Collapse by : George Klay Kieh
Download or read book Beyond State Failure and Collapse written by George Klay Kieh and published by Lexington Books. This book was released on 2007 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Various arguments have been proffered to explain the dynamics of African state failure and collapse. However, the literature on state reconstitution is inchoate and minimal. This edited volume focuses on prescriptions for reconstituting the post-colonial state in Africa. Essays on nine African states (Burundi, the Democratic Republic of the Congo, Ethiopia, Kenya, Nigeria, Sierra Leone, Somalia, South Africa, and Uganda) are preceded by an introduction to the political economy of the African state.
Book Synopsis A Treatise on Astronomy by : John Frederick William Herschel
Download or read book A Treatise on Astronomy written by John Frederick William Herschel and published by . This book was released on 1834 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atomic Energy Programs by : U.S. Atomic Energy Commission
Download or read book Atomic Energy Programs written by U.S. Atomic Energy Commission and published by . This book was released on 1973 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Creating Political Order by : Aristide R. Zolberg
Download or read book Creating Political Order written by Aristide R. Zolberg and published by . This book was released on 1966 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Postcolony by : Achille Mbembe
Download or read book On the Postcolony written by Achille Mbembe and published by Univ of California Press. This book was released on 2001-06-17 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Refreshing a stale debate about power in the postcolonial state, this book addresses a topic debated across the humanities and social sciences: how to define, discuss, and address power and the subjective experience of ordinary people in the face of power?
Book Synopsis Democratization in Africa by : Larry Jay Diamond
Download or read book Democratization in Africa written by Larry Jay Diamond and published by JHU Press. This book was released on 1999 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The country-specific chapters serve to underline the differences between African democracy and liberal democracy, yet some authors are at pains to emphasize that whatever their limitations, African democracies are an advance over what had gone before." -- African Studies Review
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1971 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt: NSA is a comprehensive collection of international nuclear science and technology literature for the period 1948 through 1976, pre-dating the prestigious INIS database, which began in 1970. NSA existed as a printed product (Volumes 1-33) initially, created by DOE's predecessor, the U.S. Atomic Energy Commission (AEC). NSA includes citations to scientific and technical reports from the AEC, the U.S. Energy Research and Development Administration and its contractors, plus other agencies and international organizations, universities, and industrial and research organizations. References to books, conference proceedings, papers, patents, dissertations, engineering drawings, and journal articles from worldwide sources are also included. Abstracts and full text are provided if available.
