Download or read book Mod lisation de l influence de la structure des joints de grains sur les ph nom nes de s gr gation written by Antoine Vaugeois and published by . This book was released on 2017 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: La présente étude porte sur la modélisation de la structure des joints de grains (JG) et sur les phénomènes de ségrégation. Dans les matériaux polycristallins, la ségrégation aux joints de grains a des conséquences importantes sur leurs propriétés structurelles et fonctionnelles : glissement intergranulaire, corrosion intergranulaire et modification des propriétés mécaniques. Ce phénomène devient particulièrement important pour les matériaux irradiés où la ségrégation intergranulaire induite par irradiation peut conduire à une modification locale de la composition des joints de grains et par conséquent, à une évolution parfois néfaste des propriétés macroscopiques de ces matériaux. Dans ce manuscrit, nous nous sommes focalisés sur le développement de la méthode des quasiparticules pour pouvoir modéliser ce phénomène dans des systèmes binaires. La méthode des quasi-particules est un modèle continu qui permet de modéliser les phénomènes physiques à l'échelle atomique. Un des avantages est lié à la possibilité de modéliser les déplacements des atomes dans l'espace continu, tout en permettant de modéliser des transitions diffusives s'étalant sur des temps longs. Dans ce travail la méthode des quasi-particules a été appliquée pour étudier la ségrégation du phosphore aux JG. Le lien entre les différentes structures des JG et la concentration du phosphore aux JG a été établi. Pour modéliser les phénomènes qui ont lieu aux JG dans les matériaux irradiés le modèle des quasi-particules a été développé pour pouvoir inclure des lacunes ou des auto-interstitiels puis décrire leurs cinétiques. Ensuite la diffusion et l'annihilation des lacunes (ou des auto-interstitiels) aux JG ont été modélisées. Il a été montré que lorsque la force de puits du JG est assez importante, les lacunes diffusent vers les JG et des cavités se forment aux JG en ayant une forme allongée, ce qui concorde avec les données expérimentales. Le modèle des quasi-particules a été également appliqué pour étudier la croissance des grains dans un polycristal.

Download or read book Joints de grains et plasticit cristalline written by PRIESTER Louisette and published by Lavoisier. This book was released on 2011 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: La 4e de couverture indique : "Les joints de grains jouent un rôle majeur dans les propriétés des matériaux cristallins, en particulier dans leur comportement plastique. Une connaissance approfondie de l`objet "joint de grains" et des réactions élémentaires entre dislocations et joints de grains s`avère nécessaire pour mieux comprendre les comportements intergranulaires dans la déformation à chaud et à froid, le fluage, la fatigue et la rupture. Cette connaissance passe par le couplage des études physiques, chimiques et mécaniques ; elle requiert également une approche multi échelle : depuis l`échelle nanométærique de la structure fine du joint de grains jusqu`à l`échelle macroscopique de la réponse du polycristal à une sollicitation mécanique. Ces différents aspects sont pris en compte dans cet ouvrage ; la compréhension de l`influence des joints de grains sur la plasticité cristalline apparaît comme un enjeu dans la maîtrise des performances des matériaux."

Download or read book Les joints de grains written by Louisette Priester and published by EDP Sciences. This book was released on 2012-12-03T00:00:00+01:00 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les joints de grains sont des éléments majeurs constitutifs des matériaux cristallins. Ils jouent un rôle important dans les propriétés de ces matériaux d'autant plus que la taille des grains diminue et/ou que des procédés d'élaboration et de transformation se développent permettant de jouer sur la diversité de ces éléments dans un polycristal. Cet ouvrage présente les connaissances de base sur les joints de grains et ouvre la voie à des orientations de recherche diversifiées dans ce domaine. Le recours à des approches mathématiques est volontairement limité. Les exemples sont privilégiés, les questions qu'ils soulèvent sont discutées par référence aux théories. La démarche générale est sous-tendue par deux objectifs étroitement associés : - conduire le lecteur du joint « idéal » au joint « réel » dans les matériaux d'emploi ; - partir des connaissances établies pour aborder les perspectives qui se dessinent dans la voie d'une « Ingénierie des joints de grains ». Par ce concept, on vise la maîtrise des textures morphologiques et cristallographiques qui conditionnent les propriétés des matériaux. Ces idées expliquent la division de l'ouvrage en trois grandes parties : 1/ De l'ordre au désordre intergranulaire ; 2/ Du joint de grains idéal au joint de grains réel ; et 3/ Du joint de grains libre au joint de grains contraint. Ce livre s'adresse aux étudiants en thèse, aux ingénieurs et aux chercheurs en Science des matériaux ; il vise également une communauté scientifique désireuse de parfaire ses connaissances sur les solides cristallins et d'appréhender l'enjeu d'une Ingénierie des joints de grains pour l'amélioration des performances des matériaux.

Download or read book INFLUENCE DES JOINTS DE GRAINS SUR LES PROPRIETES DE TRANSPORT DES COUCHES POLYCRISTALLINES SEMI METALLIQUES written by Denis Deschacht and published by . This book was released on 1984 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: ON A ETABLI UNE PROCEDURE PERMETTANT D'ETUDIER LA RELATION QUALITATIVE ET QUANTITATIVE ENTRE LA STRUCTURE DE LA COUCHE ET SES PROPRIETES DE TRANSPORT. PROPRIETES STRUCTURELLES ET PROCESSUS DE STABILISATION. MODELES DE CONDUCTION DES COUCHES MINCES POLYCRISTALLINES METALLIQUES. INFLUENCE DES JOINTS DE GRAINS SUR LA RESISTIVITE ELECTRIQUE DES COUCHES POLYCRISTALLINES SEMI-METALLIQUES. INFLUENCE DES JOINTS DE GRAINS SUR LE COEFFICIENT DE TEMPERATURE DE LA RESISTIVITE. INFLUENCE DES JOINTS DE GRAINS SUR LE POUVOIR THERMOELECTRIQUE DES COUCHES POLYCRISTALLINES SEMI-METALLIQUES

Download or read book Livestock Policy Analysis written by International Livestock Research Institute and published by ILRI (aka ILCA and ILRAD). This book was released on 1995-01-01 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Policy concepts; Identification of policy issues; Production systems, supply and demand; Market, price and trade policies; Marketing and distribution systems; Budget and manpower planning; Land tenure police for the livestock sector; Policy analysis report writing and communication; Livestock production and marketing in alphabeta - a case study.

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 Satellite Situation Report written by Goddard Space Flight Center. Office of Public Affairs and published by . This book was released on 1977 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ZnO Thin Films written by Paolo Mele and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide (ZnO) is an n-type semiconductor with versatile applications such as optical devices in ultraviolet region, piezoelectric transducers, transparent electrode for solar cells and gas sensors. This book "ZnO Thin Films: Properties, Performance and Applications" gives a deep insight in the intriguing science of zinc oxide thin films. It is devoted to cover the most recent advances and reviews the state of the art of ZnO thin films applications involving energy harvesting, microelectronics, magnetic devices, photocatalysis, photovoltaics, optics, thermoelectricity, piezoelectricity, electrochemistry, temperature sensing. It serves as a fundamental information source on the techniques and methodologies involved in zinc oxide thin films growth, characterization, post-deposition plasma treatments and device processing. This book will be invaluable to the experts to consolidate their knowledge and provide insight and inspiration to beginners wishing to learn about zinc oxide thin films.

Download or read book Triumph of a Time Lord written by Matt Hills and published by Bloomsbury Publishing. This book was released on 2010-01-30 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Before Saturday March 26th 2005, "Doctor Who" had been off the air as a regular, new TV series for more than fifteen years; until a production team led by Russell T. Davies re-imagined the programme so successfully, so triumphantly, that it's become an instant Christmas tradition, a BAFTA winner, an international 'superbrand' and a number one rated show. It's even been credited with reinventing family TV. This is the first full-length book to explore the 'new Who' phenomenon through to the casting of Matt Smith as the new Doctor. It explores "Doctor Who" through contemporary debates in TV Studies about quality TV and how can we define TV series as both 'cult' and 'mainstream'. Further, the book challenges assumptions in focusing on the importance of breath-taking, dramatic moments along with narrative structures, and in analysing the significance of Murray Gold's music as well as the series' visual representations. Matt Hills is a lifelong "Who" fan and he also considers the role of fandom in the show's return. He investigates too the multi-generic identity, the monster-led format, and the time-travelling brand of BBC Wales' 'Doctor Who'. In the twenty-first century, TV is changing, but the last of the Time Lords has been more than ready: he's been fantastic.

Download or read book Show Sold Separately written by Jonathan Gray and published by NYU Press. This book was released on 2010-01-01 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: Highlights the trailers, merchandising and cultural conversations that shape our experiences of film and television It is virtually impossible to watch a movie or TV show without preconceived notions because of the hype that precedes them, while a host of media extensions guarantees them a life long past their air dates. An onslaught of information from print media, trailers, internet discussion, merchandising, podcasts, and guerilla marketing, we generally know something about upcoming movies and TV shows well before they are even released or aired. The extras, or “paratexts,” that surround viewing experiences are far from peripheral, shaping our understanding of them and informing our decisions about what to watch or not watch and even how to watch before we even sit down for a show. Show Sold Separately gives critical attention to this ubiquitous but often overlooked phenomenon, examining paratexts like DVD bonus materials for The Lord of the Rings, spoilers for Lost, the opening credits of The Simpsons, Star Wars actions figures, press reviews for Friday Night Lights, the framing of Batman Begins, the videogame of The Thing, and the trailers for The Sweet Hereafter. Plucking these extra materials from the wings and giving them the spotlight they deserve, Jonathan Gray examines the world of film and television that exists before and after the show.

Download or read book Agricultural English written by Georgeta Raţă and published by Cambridge Scholars Publishing. This book was released on 2012-04-25 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Agricultural English is a collection of essays on the English of Agriculture. The approach is a linguistic one: the different aspects of the English used in the field of agriculture (agricultural practices, agricultural systems) and in some fields related to agriculture (agricultural zoology, agri-tourism, biology, botany, ecology, entomology, gastronomy, land measurement, plant pathology, zoology) are analysed from a morphological (combination, derivation), syntactical (nominal phrases, verbal phrases), lexical and lexicographical, semantic (homonymy, semantic fields, synonymy, terminology), pragmatic (academic discourse, idiom, metaphor), etymological (etymon, Latin heritage), and contrastive (English–Croatian, English–French, English–German, English–Romanian, Romanian–English) points of view. The book will appeal to agriculturists, animal breeders, professors, researchers, students, and translators from Croatian-, English-, French-, German-, and Romanian-speaking countries, active in their own countries or abroad. The types of academic readership it would appeal to include academic teaching staff, researchers and students in the fields of agriculture and related fields – agricultural zoology, agri-tourism, biology, botany, ecology, entomology, gastronomy, land measurement, plant pathology, and zoology.

Download or read book Space Debris written by Heiner Klinkrad and published by Springer Science & Business Media. This book was released on 2006-09-01 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: The future evolution of the debris environment will be forecast on the basis of traffic models and possible hazard mitigation practices. The text shows how large trackable objects will have re-entry pinpointed and predictions made on related risk assessment for possible ground impact. Models will also be described for meteoroids which are also a prevailing risk.

Download or read book The Columbia History of American Television written by Gary Richard Edgerton and published by Columbia University Press. This book was released on 2007 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Richly researched and engaging, The Columbia History of American Television tracks the growth of TV into a convergent technology, a global industry, a social catalyst, a viable art form, and a complex and dynamic reflection of the American mind and character. Renowned media historian Gary R. Edgerton follows the technological progress and increasing cultural relevance of television from its prehistory (before 1947) to the Network Era (1948-1975) and the Cable Era (1976-1994). He considers the remodeling of television's look and purpose during World War II; the gender, racial, and ethnic components of its early broadcasts and audiences; its transformation of postwar America; and its function in the political life of the country. In conclusion, Edgerton takes a discerning look at our current Digital Era and the new forms of instantaneous communication that continue to change America's social, political, and economic landscape.

Download or read book Basic Elements of Narrative written by David Herman and published by John Wiley & Sons. This book was released on 2011-09-13 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Basic Elements of Narrative outlines a way of thinking about what narrative is and how to identify its basic elements across various media, introducing key concepts developed by previous theorists and contributing original ideas to the growing body of scholarship on stories. Includes an overview of recent developments in narrative scholarship Provides an accessible introduction to key concepts in the field Views narrative as a cognitive structure, type of text, and resource for interpersonal communication Uses examples from literature, face to face interaction, graphic novels, and film to explore the core features of narrative Includes a glossary of key terms, full bibliography, and comprehensive index Appropriate for multiple audiences, including students, non-specialists, and experts in the field

Download or read book Speculations on Speculation written by James E. Gunn and published by Scarecrow Press. This book was released on 2005 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Science fiction is a field of literature that has great interest and great controversy among its writers and critics. This book examines the roots, history, development, current status, and future directions of the field through articles contributed by well-respected science fiction writers, teachers, and critics. This book can be used as a textbook for courses in theory as well as courses in science fiction literature and science fiction writing.

Download or read book Unnatural Narratives Unnatural Narratology written by Jan Alber and published by Walter de Gruyter. This book was released on 2011-09-29 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, the study of unnatural narratives has become an exciting new but still disparate research program in narrative theory. For the first time, this collection of essays presents and discusses the new analytical tools that have so far been developed on the basis of unnatural novels, short stories, and plays and extends these findings through analyses of testimonies, comics, graphic novels, films, and oral narratives. Many narratives do not only mimetically reproduce the world as we know it but confront us with strange narrative worlds which rely on principles that have very little to do with the actual world around us. The essays in this collection develop new narratological tools and modeling systems which are designed to capture the strangeness and extravagance of such anti-realist narratives. Taken together, the essays offer a systematic investigation of anti-mimetic techniques and strategies that relate to different narrative parameters, different media, and different periods within literary history.