Etude de l'évolution des couches minces de fluorure de calcium à l'aide de leurs propriétés optiques PDF Download
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Author: Bernard Robrieux
Publisher:
ISBN:
Category :
Languages : fr
Pages : 60
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Author: Bernard Robrieux
Publisher:
ISBN:
Category :
Languages : fr
Pages : 60
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Book Description
Author: LAURIN.. DUMAS
Publisher:
ISBN:
Category :
Languages : fr
Pages : 209
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Book Description
LA REALISATION DE COUCHES MINCES DE FLUORURES, DEPOSEES A FROID, POSSEDANT DE BONNES CARACTERISTIQUES OPTIQUES ET MECANIQUES, EST UN ENJEU IMPORTANT POUR L'INDUSTRIE OPHTALMIQUE ET POUR TOUS LES TRAITEMENTS ANTIREFLET SUR SUBSTRATS NE SUPPORTANT PAS D'ELEVATION DE TEMPERATURE. CE TRAVAIL CONCERNE LE DEPOT DE COUCHES MINCES DE MGF 2 PAR EVAPORATION AVEC OU SANS ASSISTANCE DE LA CROISSANCE DES COUCHES PAR UN FAISCEAU D'IONS. IL CONTRIBUE A AMELIORER LES CONNAISSANCES SUR LES INTERACTIONS ENTRE UN FAISCEAU D'IONS ET UNE COUCHE MINCE EN COURS DE CROISSANCE, ET ETABLIT DES CORRELATIONS ENTRE LES PARAMETRES DE DEPOT ET LES PROPRIETES PHYSICO-CHIMIQUES ET MECANIQUES DES MATERIAUX DEPOSES. NOUS AVONS MONTRE QUE LE PARAMETRE CLE GOUVERNANT LES EFFETS DE L'ASSISTANCE IONIQUE EST LA QUANTITE DE MOUVEMENT NORMALISEE DES IONS INCIDENTS. LES PROCESSUS FONDAMENTAUX DETERMINANT LA COMPOSITION, LA DENSITE ET L'ETAT DE CONTRAINTE DES COUCHES DE MGF 2, ONT ETE IDENTIFIES. EN PARTICULIER, L'INFLUENCE DE LA NATURE ET DE LA REACTIVITE DE L'ION (ARGON, XENON ET OXYGENE) A ETE ETUDIEE. L'ETUDE DES PROPRIETES OPTIQUES DES COUCHES MET EN EVIDENCE LE ROLE CRITIQUE DE LA TEMPERATURE DU SUBSTRAT PENDANT L'ASSISTANCE IONIQUE. LES EFFETS DE GUERISON OPTIQUE, LORS DE TRAITEMENTS THERMIQUES ET D'EXPOSITIONS A UN RAYONNEMENT UV, APPORTENT DES ELEMENTS DE COMPREHENSION SUR LES MECANISMES QUI SONT A L'ORIGINE DE L'ABSORPTION OPTIQUE DES COUCHES MINCES DE MGF 2 OBTENUES PAR TECHNIQUE DE DEPOT ENERGETIQUE. L'EVAPORATION ASSISTEE PAR FAISCEAU D'IONS NE PERMET PAS DE DEPOSER DES COUCHES MINCES DE MGF 2 A LA FOIS DENSES, FAIBLEMENT CONTRAINTES ET SUFFISAMMENT TRANSPARENTES DANS L'UV. POUR OPTIMISER LES PROPRIETES PHYSICO-CHIMIQUES, MECANIQUES ET OPTIQUES DES COUCHES, UN COMPROMIS DOIT ETRE ADOPTE EN FONCTION DE L'APPLICATION OPTIQUE.
Author: Antoinette Bourg-Salvadori
Publisher:
ISBN:
Category :
Languages : fr
Pages : 44
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Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9789251055212
Category : Technology & Engineering
Languages : en
Pages : 116
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Book Description
Soils are affected by human activities, such as industrial, municipal and agriculture, that often result in soil degradation and loss. In order to prevent soil degradation and to rehabilitate the potentials of degraded soils, reliable soil data are the most important prerequisites for the design of appropriate land-use systems and soil management practices as well as for a better understanding of the environment. The availability of reliable information on soil morphology and other characteristics obtained through examination and description of the soil in the field is essential, and the use of a common language is of prime importance. These guidelines, based on the latest internationally accepted systems and classifications, provide a complete procedure for soil description and for collecting field data. To help beginners, some explanatory notes are included as well as keys based on simple test and observations.--Publisher's description.
Author: J. F. Cameron
Publisher: Elsevier
ISBN: 1483159337
Category : Technology & Engineering
Languages : en
Pages : 321
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Book Description
International Series of Monographs in Nuclear Energy, Volume 107: Radioisotope Instruments, Part 1 focuses on the design and applications of instruments based on the radiation released by radioactive substances. The book first offers information on the physical basis of radioisotope instruments; technical and economic advantages of radioisotope instruments; and radiation hazard. The manuscript then discusses commercial radioisotope instruments, including radiation sources and detectors, computing and control units, and measuring heads. The text describes the applications of radioisotope instruments in the industries, including mining and quarrying; agriculture, forestry, and fishing; manufacturing industries; transport and communications; and civil engineering constructions. The manuscript also focuses on legislation and codes of practice on the use of sealed radioisotope sources and control of radiation hazard. The book is a dependable reference for readers interested in radioisotope instruments.
Author: Mark S. Meskin
Publisher: CRC Press
ISBN: 1420031694
Category : Medical
Languages : en
Pages : 221
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Book Description
Are soy isoflavones neuroprotective? Just how different is one species of Echinacea from another? Which phytochemicals will be effective as therapeutic agents in vivo? Supported by solid scientific research, Phytochemicals in Nutrition and Health helps provide answers to these and other probing questions concerning the mechanisms of action associat
Author: Alain Reinberg
Publisher: CRC Press
ISBN:
Category : Design
Languages : en
Pages : 268
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Book Description
Periodical and predictable changes in biological susceptibility and response to a large variety of chemical agents, including drugs and food, have been documented since the early 1970s. This book provides a survey of clinically-documented research in chronopharmacology.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
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Author: Jacques Lafontaine
Publisher: Springer
ISBN: 3319207350
Category : Mathematics
Languages : en
Pages : 408
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Book Description
This book is an introduction to differential manifolds. It gives solid preliminaries for more advanced topics: Riemannian manifolds, differential topology, Lie theory. It presupposes little background: the reader is only expected to master basic differential calculus, and a little point-set topology. The book covers the main topics of differential geometry: manifolds, tangent space, vector fields, differential forms, Lie groups, and a few more sophisticated topics such as de Rham cohomology, degree theory and the Gauss-Bonnet theorem for surfaces. Its ambition is to give solid foundations. In particular, the introduction of “abstract” notions such as manifolds or differential forms is motivated via questions and examples from mathematics or theoretical physics. More than 150 exercises, some of them easy and classical, some others more sophisticated, will help the beginner as well as the more expert reader. Solutions are provided for most of them. The book should be of interest to various readers: undergraduate and graduate students for a first contact to differential manifolds, mathematicians from other fields and physicists who wish to acquire some feeling about this beautiful theory. The original French text Introduction aux variétés différentielles has been a best-seller in its category in France for many years. Jacques Lafontaine was successively assistant Professor at Paris Diderot University and Professor at the University of Montpellier, where he is presently emeritus. His main research interests are Riemannian and pseudo-Riemannian geometry, including some aspects of mathematical relativity. Besides his personal research articles, he was involved in several textbooks and research monographs.
Author: Sue Blattes
Publisher: L'Editeur : EDP Sciences
ISBN: 9782868835888
Category : English language
Languages : fr
Pages : 264
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Book Description
Cet ouvrage, devenu célèbre sous son sigle MCSE, a déjà été utilisé par plus de 50 000 étudiants, chercheurs, professionnels. L'objectif est de lire et écrire des textes en anglais scientifique avec facilité et pertinence. L'ouvrage est conçu pour que l'apprenant devienne un véritable utilisateur de l'anglais. La méthode originale repose sur l'analyse des fonctions et structures nécessaires : measurement, frequency, comparison, modification, link words, time, cause and consequence, hypothesis, modality, purpose and process, impersonal forms, compound nouns and adjectives. Dans chaque unit, des tests d'auto-évaluation permettent de se situer et de construire son parcours de formation, d'abord en définissant ses objectifs à l'aide des key points et du lexis, puis, de façon plus personnalisée, en puisant dans les examples in context, checkpoints (back to basics, word web), web search, FAQs... MCSE est l'outil de base d'une méthode qui comprend aussi d'autres outils dans la même collection (Listening Comprehension for Scientiflc English et Speaking Skills in Scientitic English). L'ouvrage est destiné à tout apprenant de niveau baccalauréat qui désire acquérir une réelle compétence dans l'écriture et la lecture de textes en anglais scientifique.
