Download or read book PROBABILITES DE TRANSITION ET LARGEUR DES RAIES D ABSORPTION DANS LA MATRICE LASER YVO 4 ND written by OLIVIER.. GUILLOT NOEL and published by . This book was released on 1998 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'AVENEMENT DU POMPAGE PAR DIODES LASER DES LASERS SOLIDES A SUSCITE LA RECHERCHE DE MATERIAUX LASERS BIEN ADAPTES A CE TYPE D'EXCITATION. ACTUELLEMENT, C'EST LA MATRICE ZIRCON YVO 4:ND QUI SEMBLE LA PLUS PERFORMANTE, NOTAMMENT DANS LE CADRE D'UN USAGE TRES SPECIFIQUE : LES LASERS MICROCHIPS OU MICROPUCES. POUR CE TYPE D'APPLICATION, COMME LES CRISTAUX LASERS SONT DE PETITES TAILLES ( 1 MM 3), L'ION ND 3 + DOIT PRESENTER DES SECTIONS EFFICACES D'ABSORPTION ELEVEES POUR ABSORBER LA MAJEURE PARTIE DU RAYONNEMENT DE POMPAGE SUR UNE FAIBLE EPAISSEUR, ET DES BANDES D'ABSORPTION LARGES POUR CONTRECARRER LA DERIVE EN LONGUEUR D'ONDE DES DIODES (0,3 NM/\C) PAR SUITE DE L'ECHAUFFEMENT DE LEUR JONCTION LORSQU'ELLES MONTENT EN PUISSANCE. UNE ETUDE PLUS EN AMONT DES RELATIONS ENTRE LA STRUCTURE DU MATERIAU (SITE DE SUBSTITUTION DE L'ION NEODYME, IMPORTANCE DES GROUPEMENTS VO 4 3 -) ET LES PROPRIETES OPTIQUES DE L'ION ND 3 + (LARGE BANDE D'ABSORPTION HOMOGENE, SECTION EFFICACE D'ABSORPTION ELEVEE AUTOUR DE 810 NM) EST PROPOSEE. POUR TENTER DE COMPRENDRE LES LIENS ETROITS ENTRE LE SOLIDE ET LE DOPANT, NOUS N'ETUDIONS PAS SEULEMENT LA MATRICE YVO 4 : ND, MAIS PLUTOT UNE SERIE ISOSTRUCTURALE, EN SUBSTITUANT LE GROUPEMENT VO 4 PAR LES GROUPEMENTS PO 4 ET ASO 4, AFIN DE DETERMINER L'IMPORTANCE DE CES GROUPEMENTS SUR LES PROPRIETES DE L'ION NEODYME. NOTRE TRAVAIL S'ARTICULE AUTOUR DE TROIS POLES. LES INTERACTIONS ND 3 +-MATRICE SONT ETUDIEES D'UN POINT DE VUE ELECTROSTATIQUE (APPROCHE DE TYPE CHAMP CRISTALLIN). CECI NOUS CONDUIT A ANALYSER, A BASSE TEMPERATURE, LES INHOMOGENEITES DE DISTRIBUTION DE L'ION NEODYME DANS LES SITES DE SUBSTITUTION DES MATRICES ZIRCON. NOUS ETUDIONS L'INFLUENCE DE LA TEMPERATURE SUR LES LARGEURS DES TRANSITIONS OPTIQUES DE L'ION ND 3 +, LA MATRICE N'ETANT PLUS CONSIDEREE COMME STATIQUE MAIS PLUTOT DYNAMIQUE. NOUS REVENONS ENFIN SUR LES INTERACTIONS ND 3 +-MATRICE EN TENANT COMPTE DES INTERACTIONS ORBITALAIRES ENTRE LES NIVEAUX DE LA TERRE RARE ET CEUX DE LA MATRICE.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Download or read book Organic Solid State Lasers written by Sébastien Forget and published by Springer. This book was released on 2013-07-03 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Applied Mineralogy in the Mining Industry written by W. Petruk and published by Elsevier. This book was released on 2000-11-29 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: Techniques of performing applied mineralogy investigations, and applications and capabilities of recently developed instruments for measuring mineral properties are explored in this book intended for practicing applied mineralogists, students in mineralogy and metallurgy, and mineral processing engineers. The benefits of applied mineralogy are presented by using in-depth applied mineralogy studies on base metal ores, gold ores, porphyry copper ores, iron ores and industrial minerals as examples. The chapter on base metal ores includes a discussion on the effects of liberation, particle sizes and surfaces coatings of Pb, Cu, Fe, Ca and So4- on the recoveries of sphalerite, galena and chalcopyrite. The chapter on gold discusses various methods of determining the quantities of gold in different minerals, including 'invisible' gold in pyrite and arsenopyrite, so that a balance of the distribution of gold among the minerals can be calculated. This book also discusses the roles of pyrite, oxygen, moisture and bacterial (thiobacillus ferrooxidans) on reactions that produce acidic drainage from tailings piles, and summarizes currently used and proposed methods of remediation of acidic drainage.
Download or read book Quantum Theory of Finite Systems written by Jean-Paul Blaizot and published by Mit Press. This book was released on 1986 with total page 657 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive and pedagogical account of the various methods used in the quantum theory of finite systems, including molecular, atomic, nuclear, and particle phenomena. Covering both background material and advanced topics and including nearly 200 problems, Quantum Theory of Finite Systems has been designed to serve primarily as a text and will also prove useful as a reference in research. The first of the book's four parts introduces the basic mathematical apparatus: second quantization, canonical transformations, Wick theorems and the resulting diagram expansions, and oscillator models. The second part presents mean field approximations and the recently developed path integral methods for the quantization of collective modes. Part three develops perturbation theory in terms of both time-dependent Feynman diagrams and time-independent Goldstone diagrams. A fourth part discusses variational methods based on correlated wavefunctions, including spin correlations. The approximation schemes are formulated for fermions and bosons at eigher zero or non-zero temperature. Although the formalism developed applies to both finite and infinite systems, the book stresses those aspects of the theory that are specific to the description of finite systems. Thus special attention is given to mean field approximations, the ensuing broken symmetries, and the associated collective motions such as rotations. Conversely, some specific features of systems with infinite numbers of degrees of freedom (such as the thermodynamic limit, critical phenomena, and the elimination of ultraviolet divergencies) are deliberately omitted. Jean-Paul Blaizot and Georges Ripka are associated with the Centre d'Etudes Nucleaires de Saclay.
Download or read book Africa Since 1935 written by Unesco. International Scientific Committee for the Drafting of a General History of Africa and published by Univ of California Press. This book was released on 1999 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hardcover edition of volume 8 was published in 1994. This paperback edition is the eighth and final volume to be published in the UNESCO General History of Africa. Volume 8 examines the period from 1935 to the present, and details the role of African states in the Second World War and the rise of postwar Africa. This is one of the most important books in the entire series, and as such, it is an unabridged paperback.
Download or read book Applied Reactor Physics written by Alain Hébert and published by Presses inter Polytechnique. This book was released on 2009 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laser 50 Years Of Discoveries written by Fabien Bretenaker and published by World Scientific. This book was released on 2014-10-27 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique book provides an overview of the principle and applications of lasers enriched with numerous illustrations.Being over fifty years old, lasers continue to amaze us. Their performance characteristics are constantly reaching new limits, and the scope of their applications continues to expand. Yet, it took years of effort by teams of physicists to transform the fundamental notions of Einstein into the first experimental beam of laser light. And history is still going on as fundamental research is now triggered by its remarkable properties.This book addresses every aspects of laser light, from its fundamental principles to its industrial applications, at a level particularly suited for high school teachers, students, and anybody curious about science and technology.
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.
Download or read book Transport Theory written by James J. Duderstadt and published by John Wiley & Sons. This book was released on 1979 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: Problems after each chapter
Download or read book Neutron Monitoring for Radiological Protection written by J. A. B. Gibson and published by . This book was released on 1985 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Radiation Protection written by M. Oberhofer and published by Springer Science & Business Media. This book was released on 1991-04-30 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the Lectures given during the Ispra-Course held at the Centro de Formação Técnica, Lisbon, Portugal, October 23-27, 1989, in collaboration with the Laboratorio Nacional de Engenharia e Tecnologia
Download or read book Nuclear Computational Science written by Yousry Azmy and published by Springer Science & Business Media. This book was released on 2010-04-15 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear engineering has undergone extensive progress over the years. In the past century, colossal developments have been made and with specific reference to the mathematical theory and computational science underlying this discipline, advances in areas such as high-order discretization methods, Krylov Methods and Iteration Acceleration have steadily grown. Nuclear Computational Science: A Century in Review addresses these topics and many more; topics which hold special ties to the first half of the century, and topics focused around the unique combination of nuclear engineering, computational science and mathematical theory. Comprising eight chapters, Nuclear Computational Science: A Century in Review incorporates a number of carefully selected issues representing a variety of problems, providing the reader with a wealth of information in both a clear and concise manner. The comprehensive nature of the coverage and the stature of the contributing authors combine to make this a unique landmark publication. Targeting the medium to advanced level academic, this book will appeal to researchers and students with an interest in the progression of mathematical theory and its application to nuclear computational science.
Download or read book The Physics of Nuclear Reactors written by Serge Marguet and published by Springer. This book was released on 2018-02-26 with total page 1462 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive volume offers readers a progressive and highly detailed introduction to the complex behavior of neutrons in general, and in the context of nuclear power generation. A compendium and handbook for nuclear engineers, a source of teaching material for academic lecturers as well as a graduate text for advanced students and other non-experts wishing to enter this field, it is based on the author’s teaching and research experience and his recognized expertise in nuclear safety. After recapping a number of points in nuclear physics, placing the theoretical notions in their historical context, the book successively reveals the latest quantitative theories concerning: • The slowing-down of neutrons in matter • The charged particles and electromagnetic rays • The calculation scheme, especially the simplification hypothesis • The concept of criticality based on chain reactions • The theory of homogeneous and heterogeneous reactors • The problem of self-shielding • The theory of the nuclear reflector, a subject largely ignored in literature • The computational methods in transport and diffusion theories Complemented by more than 400 bibliographical references, some of which are commented and annotated, and augmented by an appendix on the history of reactor physics at EDF (Electricité De France), this book is the most comprehensive and up-to-date introduction to and reference resource in neutronics and reactor theory.
Download or read book Luminescence Dosimetry written by Frank H. Attix and published by . This book was released on 1967 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report of NRL Progress written by Naval Research Laboratory (U.S.) and published by . This book was released on 1962 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reactor Dosimetry written by Harry Farrar and published by ASTM International. This book was released on 1994 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 8th ASTM-Euratom Symposium, held in Vail, Colorado, Aug.-Sept. 1993, to provide a forum for experts to discuss their latest results under the broad theme of dosimetry for the correlation of radiation effects. Preceded by a summary of the keynote presentations and followed by summa
