Download or read book Origine de l clatement de grain sur des pi ces forg es en Inconel 718 written by Andrea Agnoli and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'Inconel 718 est un superalliage base nickel très utilisé pour produire les disques de turboréacteurs. Typiquement, une gamme de forgeage à chaud se compose de plusieurs étapes de déformation et de recuit. La présence des particules de seconde phase (particules de phase delta dans l'Inconel 718) permet en principe de limiter la croissance de grains pendant les étapes de recuit grâce au phénomène d'ancrage de Zener. Néanmoins, l'hétérogénéité microstructurale (distribution des particules, écrouissage, composition chimique) peut favoriser une croissance anormale des grains pendant le recuit. Ce phénomène est connu industriellement sous la terminologie d'"éclatement de grains". Les objectifs de la thèse étaient d'identifier les mécanismes responsables de l'éclatement des grains qui peut survenir durant les étapes de recuit sur les pièces forgées en Inconel 718, de les modéliser, et de simuler numériquement le phénomène. Les mécanismes physiques à l'origine du phénomène sont d'abord étudiés expérimentalement grâce à la caractérisation (par MEB et EBSD) des pièces forgées. L'influence des particules de seconde phase et de l'énergie stockée (estimée par des mesures de désorientations intragranulaires) est notamment étudiée. A partir des observations réalisées, une explication est proposée : le phénomène apparaît lorsque les forces motrices pour la migration des joints de grains dépassent la force de freinage de Zener ; ceci peut se produire lorsque la microstructure contient de l'énergie stockée, distribuée de manière hétérogène. Des essais de torsion à chaud sont mis en place pour reproduire, en laboratoire, le même phénomène, étudier la sensibilité aux paramètres thermomécaniques, et tester les hypothèses émises concernant les mécanismes. Les mécanismes ainsi identifiés comme responsables de l'éclatement de grains sont enfin simulés au moyen d'un modèle numérique en 2D. Le modèle numérique en champ complet est basé sur la méthode des éléments finis, et utilise le formalisme level-set pour décrire les joints de grains. La simulation de l'évolution microstructurale prend en compte à la fois les forces motrices des joints de grains liées à la capillarité et à l'énergie stockée, et l'interaction des joints de grains avec les particules de seconde phase. Ainsi, l'effet de la distribution de l'énergie stockée (estimée à partir de données expérimentales) a pu être étudié numériquement dans des microstructures avec particules.
Download or read book Modern Alchemy written by Mark Morrisson and published by Oxford University Press. This book was released on 2007-04-19 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Alchemists are generally held to be the quirky forefathers of science, blending occultism with metaphysical pursuits. Although many were intelligent and well-intentioned thinkers, the oft-cited goals of alchemy paint these antiquated experiments as wizardry, not scientific investigation. Whether seeking to produce a miraculous panacea or struggling to transmute lead into gold, the alchemists radical goals held little relevance to consequent scientific pursuits. Thus, the temptation is to view the transition from alchemy to modern science as one that discarded fantastic ideas about philosophers stones and magic potions in exchange for modest yet steady results. It has been less noted, however, that the birth of atomic science actually coincided with an efflorescence of occultism and esoteric religion that attached deep significance to questions about the nature of matter and energy. Mark Morrisson challenges the widespread dismissal of alchemy as a largely insignificant historical footnote to science by prying into the revival of alchemy and its influence on the emerging subatomic sciences of the late 19th and early 20th centuries.Morrisson demonstrates its surprising influence on the emerging subatomic sciences of the late 19th and early 20th centuries. Specifically, Morrisson examines the resurfacing of occult circles during this time period and how their interest in alchemical tropes had a substantial and traceable impact upon the science of the day. Modern Alchemy chronicles several encounters between occult conceptions of alchemy and the new science, describing how academic chemists, inspired by the alchemy revival, attempted to transmute the elements; to make gold. Examining scientists publications, correspondence, talks, and laboratory notebooks as well as the writings of occultists, alchemical tomes, and science-fiction stories, he argues that during the birth of modern nuclear physics, the trajectories of science and occultism---so often considered antithetical---briefly merged.
Download or read book Manga written by Toni Johnson-Woods and published by A&C Black. This book was released on 2010-04-15 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: A collection of essays by an international cast of scholars, experts, and fans, providing a definitive, one-stop Manga resource.
Download or read book Iceland written by Sabine Baring-Gould and published by Signal Books. This book was released on 2007 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: So begins Sabine Baring-Gould's account of his journey on horseback around Iceland in 1862. Aged twenty-eight, the young writer and teacher was fascinated by the tradition of the Icelandic sagas, and this was the catalyst for his adventure and the book that emerged from it. His voyage took him from the then tiny settlement of Reykjavik through remote and hostile terrain, passing through the empty expanse of Iceland's countryside. He observed mountains and glaciers, volcanoes and geysers, wondering at the wild beauty of the landscape. He also recorded the rich flora and fauna that he saw-and, to his chagrin, that his companions shot.
Download or read book I Have a Dog written by Charlotte Lance and published by Allen & Unwin. This book was released on 2014-05-01 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: I have a dog. An inconvenient dog. When I wake up, my dog is inconvenient. When I'm getting dressed, my dog is inconvenient. And when I'm making tunnels, my dog is SUPER inconvenient. But sometimes, an inconvenient dog can be big and warm and cuddly. Sometimes, an inconvenient dog can be the most comforting friend in the whole wide world.
Download or read book Decisions of the Commissioner of Patents written by and published by . This book was released on 1871 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Encyclopedia of Ancient Natural Scientists written by Paul T. Keyser and published by Routledge. This book was released on 2008-11-19 with total page 1468 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Encyclopedia of Ancient Natural Scientists is the first comprehensive English language work to provide a survey of all ancient natural science, from its beginnings through the end of Late Antiquity. A team of over 100 of the world’s experts in the field have compiled this Encyclopedia, including entries which are not mentioned in any other reference work – resulting in a unique and hugely ambitious resource which will prove indispensable for anyone seeking the details of the history of ancient science. Additional features include a Glossary, Gazetteer, and Time-Line. The Glossary explains many Greek (or Latin) terms difficult to translate, whilst the Gazetteer describes the many locales from which scientists came. The Time-Line shows the rapid rise in the practice of science in the 5th century BCE and rapid decline after Hadrian, due to the centralization of Roman power, with consequent loss of a context within which science could flourish.
Download or read book Yvain written by Chretien de Troyes and published by Yale University Press. This book was released on 1987-09-10 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: A twelfth-century poem by the creator of the Arthurian romance describes the courageous exploits and triumphs of a brave lord who tries to win back his deserted wife's love
Download or read book Python 101 written by Michael Driscoll and published by Lulu.com. This book was released on 2014-06-03 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn how to program with Python from beginning to end. This book is for beginners who want to get up to speed quickly and become intermediate programmers fast!
Download or read book The Dare written by Harley Laroux and published by . This book was released on 2023-10-31 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Jessica Martin is not a nice girl. As Prom Queen and Captain of the cheer squad, she'd ruled her school mercilessly, looking down her nose at everyone she deemed unworthy. The most unworthy of them all? The "freak," Manson Reed: her favorite victim. But a lot changes after high school. A freak like him never should have ended up at the same Halloween party as her. He never should have been able to beat her at a game of Drink or Dare. He never should have been able to humiliate her in front of everyone. Losing the game means taking the dare: a dare to serve Manson for the entire night as his slave. It's a dare that Jessica's pride - and curiosity - won't allow her to refuse. What ensues is a dark game of pleasure and pain, fear and desire. Is it only a game? Only revenge? Only a dare? Or is it something more? The Dare is an 18+ erotic romance novella and a prequel to the Losers Duet. Reader discretion is strongly advised. This book contains graphic sexual scenes, intense scenes of BDSM, and strong language. A full content note can be found in the front matter of the book.
Download or read book The Newer Alchemy written by Ernest Rutherford and published by Cambridge University Press. This book was released on 2014-12-04 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Originally published in 1937, this book discusses the contributions that the study of radiation can make to the problem of elemental transmutation.
Download or read book Food Feed and Fuel from Biomass written by D. S. Chahal and published by South Asia Books. This book was released on 1991-01-01 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Working with Children in the Early Years written by Carrie Cable and published by Routledge. This book was released on 2012-11-12 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: Working with Children in the Early Years is an accessible introduction to early years theories, policy and practice, offering practitioners in a diverse range of settings the opportunity to develop their knowledge, understanding and skills for working with young children. This fully updated second edition builds on new government agendas and interests in supporting quality provision for young children and their families. Bringing together current research and thinking in a broad range of areas, it covers: the diversity of practitioner roles and multi-agency working working with families listening to children observing and assessing developing professional roles health and well being curriculum and pedagogy the importance of play and learning in the early years All contributions are strongly practical and underpinned by relevant theory, and will support students and practitioners studying in the field of early years and early childhood studies as well as those aiming to achieve Early Years Professional Status. The book will also appeal to training providers, equipping them with a valuable and unique source to support a range of early years courses.
Download or read book Charles Pettigrew First Bishop elect of the North Carolina Episcopal Church written by Bennett H Wall and published by Hassell Street Press. This book was released on 2021-09-10 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book Problems in Greek Prehistory written by Elizabeth Bayard French and published by . This book was released on 1988 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Just Give Money to the Poor written by Joseph Hanlon and published by Kumarian Press. This book was released on 2012-03 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: * Argues strongly for overlooked approach to development by showing how the poor use money in ways that confound stereotypical notions of aid and handouts * Team authored by foremost scholars in the development field Amid all the complicated economic theories about the causes and solutions to poverty, one idea is so basic it seems radical: just give money to the poor. Despite its skeptics, researchers have found again and again that cash transfers given to significant portions of the population transform the lives of recipients. Countries from Mexico to South Africa to Indonesia are giving money directly to the poor and discovering that they use it wisely “ to send their children to school, to start a business and to feed their families. Directly challenging an aid industry that thrives on complexity and mystification, with highly paid consultants designing ever more complicated projects, Just Give Money to the Pooroffers the elegant southern alternative “ bypass governments and NGOs and let the poor decide how to use their money. Stressing that cash transfers are not charity or a safety net, the authors draw an outline of effective practices that work precisely because they are regular, guaranteed and fair. This book, the first to report on this quiet revolution in an accessible way, is essential reading for policymakers, students of international development and anyone yearning for an alternative to traditional poverty-alleviation methods.
Download or read book Lone Wolf and Cub A taste of poison written by Kazuo Koike and published by Dark Horse Manga. This book was released on 2000 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lone Wolf and Cub chronicles the story of Ogami Ittō, the shōgun's executioner who uses a dōtanuki battle sword. Disgraced by false accusations from the Yagyū clan, he is forced to take the path of the assassin. Along with his three-year-old son, Daigorō, they seek revenge on the Yagyū clan and are known as "Lone Wolf and Cub".
