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Des Limites A La Reduction Dechelle En Reacteur De Test Catalytique En Lit Fixe
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Book Synopsis Des limites à la réduction d'échelle en réacteur de test catalytique en lit fixe? by : Matthieu Rolland
Download or read book Des limites à la réduction d'échelle en réacteur de test catalytique en lit fixe? written by Matthieu Rolland and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pour des raisons de coûts, les tests de catalyseur mis en forme (billes, extrudés, ...) en réacteur est lit fixe sont mis en œuvre dans des réacteurs de plus en plus petits alors que la taille des objets catalytiques ne change pas. L'objet de cette thèse est d'explorer les domaines où la réduction d'échelle conduit à des questionnements nouveaux en termes de physique, répétabilité, représentativité et modélisation. Le document s'articule autour de 5 chapitres : 1) une introduction détaillée du contexte avec un état de l'art sur les réacteurs à lit fixe de petite taille et l'identification des questions en suspens, 2) une réflexion autour de la nature des écoulements gaz-liquide descendant dans des lits fixes quand les forces capillaires ne sont plus négligeables, 3) la présentation d'une méthodologie et d'un critère sur un nombre minimal de grain nécessaire pour limiter les conséquences d'une distribution granulométrique en présence de limitations au transfert interne, 4) l'étude des effets d'empilements aléatoires sur la performance apparente du réacteur, d'abord par un modèle réseau de pores qui décrit assez bien les tendances observées expérimentalement mais manque de capacité de prédiction, puis par simulation numérique directe d'écoulement réactif dans des empilements de 8 cylindres qui montre que les effets d'empilements apparaissent, avec les limitations au transfert externe, quand la diffusion moléculaire transverse n'est pas assez rapide pour compenser les gradients dus à la réaction et à la convection, 5) une conclusion qui résume les critères de conception de réacteurs de tests à petite échelle, et propose des pistes de continuation du travail.
Book Synopsis Comparaison des performances catalytiques entre un réacteur à lit fixe et un réacteur à lit fluidise. Application à la réduction des oxydes d'azote by : Samira Azgui
Download or read book Comparaison des performances catalytiques entre un réacteur à lit fixe et un réacteur à lit fluidise. Application à la réduction des oxydes d'azote written by Samira Azgui and published by . This book was released on 1997 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les informations empiriques (température, pression partielles ...) Obtenues sur un catalyseur solide, permettent d'établir sa spécificité envers une réaction donnée. Néanmoins, la catalyse hétérogène étant définie comme un phénomène de contact, il est important d'associer aux conditions opératoires habituellement traitées l'influence du mode de mise en œuvre. Nous avons établie une méthodologie expérimentale qui consiste a mener a l'identique la réduction catalytique et sélective du monoxyde d'azote (scr) par l'ammoniac, sur v#2o#5/tio#2-sio#2 sous forme de poudre, et cela dans deux types de réacteurs de taille identique (lit fixe et lit fluidise). A faible température, la réactivité de no et nh#3 est particulièrement sensible à la nature du réacteur. Le réacteur à lit fluidise améliore la conversion de nh#3 quelles que soient les conditions opératoires. Le résultat le plus significatif étant essentiellement une évolution de la stchiometrie, accentuée par le réacteur à lit fluidise qui semble de ce fait favoriser la formation du protoxyde d'azote (gaz nocif). Par conséquent, le mécanisme réactionnel évolue avec la nature du réacteur, donc du mode de mise en contact du catalyseur solide avec le mélange réactionnel.
Book Synopsis Étude des phénomènes de transport dans un réacteur catalytique pilote de type filaire by : Ana Isabel Fernandes Hipolito
Download or read book Étude des phénomènes de transport dans un réacteur catalytique pilote de type filaire written by Ana Isabel Fernandes Hipolito and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'extrapolation des réacteurs catalytiques nécessite l'acquisition des données cinétiques sur des réacteurs à petite échelle dans les conditions opératoires industrielles. Le critère de dimensionnement utilisé lors de la réduction d'échelle est la conservation de la vitesse volumique horaire, ce qui conduit à des vitesses de circulation très faibles dans les réacteurs pilotes à lit-fixe. A ces vitesses, les flux de transfert de matière externes peuvent devenir limitant par rapport au flux de réaction. Dans ce contexte, une nouvelle géométrie de réacteur a été imaginée pour intensifier les transferts de matière et chaleur et pour augmenter les vitesses de circulation des fluides : le réacteur "filaire". Il s'agit d'un réacteur dont le diamètre est égal ou proche de celui des grains de catalyseur et avec un ratio longueur sur diamètre très élevé. Le principal objectif de cette thèse est de caractériser ce réacteur en termes d'hydrodynamique et de transferts de matière externes pour définir ses limites d'utilisation. En écoulement diphasique, ce réacteur est relativement piston et la rétention liquide est élevée, ce qui permet d'assurer un mouillage total du catalyseur. En ce qui concerne les vitesses des transferts de matière externe, celles-ci sont proches de celles d'un réacteur agité avec panier et sont supérieures à celles caractéristiques d'un réacteur pilote à lit-fixe conventionnel. Cette observation est liée à l'augmentation des vitesses locales du liquide et à la présence d'un écoulement du type Taylor modifié. En conclusion, le réacteur "filaire" constitue une alternative efficace aux réacteurs pilotes à lit-fixe pour l'étude de catalyseurs mis en forme.
Book Synopsis Dictionary of Building and Civil Engineering by : Don Montague
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
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.
Author :Great Britain: Parliament: House of Commons: Transport Committee Publisher :The Stationery Office ISBN 13 :9780215038319 Total Pages :134 pages Book Rating :4.0/5 (383 download)
Book Synopsis The London Underground and the public-private partnership agreements by : Great Britain: Parliament: House of Commons: Transport Committee
Download or read book The London Underground and the public-private partnership agreements written by Great Britain: Parliament: House of Commons: Transport Committee and published by The Stationery Office. This book was released on 2008-01-25 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report from the Transport Committee, examines London Underground and the Public-Private Partnership Agreements. The Government originally announced proposals for modernising the London Underground network system via Public-Private Partnership (PPP) agreements in 1998. Three contracts were drawn up with: (i) Tube Lines for the maintenance and renewal of the Jubilee, Piccadilly and Northern Lines; (ii) with Metronet Rail BVC for the maintenance and renewal of the Bakerloo, Central, Victoria & Waterloo & City Lines; (iii) with Metronet Rail SSL, responsible for the maintenance and renewal of the "sub-surface lines": the Circle, District, Hammersmith & City, Metropolitan & East London Lines. These PPP Agreements, 30 years in duration, were arrangements to maintain, renew and upgrade parts of London Underground by private sector infrastructure companies (Infracos), whilst London Underground is responsible for services to customers. The PPP Agreements also set out a performance-related incentive and penalty scheme to remunerate the Infracos for the improvements they make to the network. In May 2007, Metronet admitted an overspend of £1 billion and was refused access to loan facilities by the banks. It then made a reference to the PPP Arbiter, which in turn triggered an Extraordinary Review (which occurs when extra costs are incurred above the level allowed for the bid). Metronet put in a bid for £551m but the PPP Arbiter provisionally concluded that a sum of £121m was appropriate. Metronet subsequently went into administration on 18 July 2007. The report sets out a number of conclusions and recommendations, including: contracts that were supposed to deliver 35 station upgrades, in fact delivered only 14, 40% of the requirement; stations that were supposed to cost Metronet SSL £2m, cost £7.5m, with only 65% of schedule track renewal accomplished; the Committee criticises the consequences of the imposition of PPP on Transport for London, as a "lamentable state of affairs", with the future of most of London Underground's upgrade and maintenance work in doubt; the Committee states, that the Government should remember the failure of Metronet before it considers entering similar arrangements; that the Government should publish a candid analysis of the events preceding Metronet's collapse and its consequences; the Committee believe that the PPP model was flawed and probably inferior to traditional public-sector management; that the Government needs to prioritise transparency and clarity to taxpayers and ensure that any future contracts result in clear accountability.
Book Synopsis Transforming Computer Technology by : Arthur L. Norberg
Download or read book Transforming Computer Technology written by Arthur L. Norberg and published by Johns Hopkins University Press. This book was released on 2000-02-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Winner of the Association of American Publishers Professional and Scholarly Publishing Award for Computer Science Over the course of several decades, the Pentagon's Information Processing Techniques Office (IPTO) helped transform computing from a cumbersome enterprise based on batch processing to the instantly interactive, graphically rich, highly intelligent computing of today. With the purpose of improving command and control systems for the military, IPTO researchers strengthened time-sharing, laid the groundwork for graphics and parallel processing, contributed to the study of artificial intelligence, and developed the wide-area network that came to be known as the Internet. Transforming Computer Technology examines these and other developments at the Defense Department's Advanced Research Projects Agency in its heyday between 1962 and 1986. The authors show how Pentagon programs affected significant developments in both computer science and engineering. They analyze the management of the office, the origins and growth of important IPTO programs, and the interaction of the staff with the R & D community. They pay special attention to IPTO's role in executing research at the leading edge of computing and networking and in working with the military to transfer that research into practical use. And they show how, by the 1990s, the research results had been assimilated into systems both for the military and for civilian society.
Download or read book Internet Dreams written by Mark Stefik and published by MIT Press. This book was released on 1997 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Internet Dreams illuminates not only how "the Net" is being created, but also stories about ourselves as our lives become electronically interconnected. Stefik explores some of the most provocative writings about the Internet to tease out the deeper metaphors and myths. 24 illustrations.
Book Synopsis Scientific Canadian Mechanics' Magazine and Patent Office Record by : Canada. Patent Office
Download or read book Scientific Canadian Mechanics' Magazine and Patent Office Record written by Canada. Patent Office and published by . This book was released on 1966-03 with total page 1070 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Triumph of a Time Lord by : Matt Hills
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.
Book Synopsis Where Wizards Stay Up Late by : Matthew Lyon
Download or read book Where Wizards Stay Up Late written by Matthew Lyon and published by Simon and Schuster. This book was released on 1999-08-19 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: Twenty five years ago, it didn't exist. Today, twenty million people worldwide are surfing the Net. Where Wizards Stay Up Late is the exciting story of the pioneers responsible for creating the most talked about, most influential, and most far-reaching communications breakthrough since the invention of the telephone. In the 1960's, when computers where regarded as mere giant calculators, J.C.R. Licklider at MIT saw them as the ultimate communications devices. With Defense Department funds, he and a band of visionary computer whizzes began work on a nationwide, interlocking network of computers. Taking readers behind the scenes, Where Wizards Stay Up Late captures the hard work, genius, and happy accidents of their daring, stunningly successful venture.
Download or read book Netizens written by Michael Hauben and published by Wiley-IEEE Computer Society Press. This book was released on 1997-05-11 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors conducted online research to find out what makes the Internet "tick", resulting in this examination of the pioneering vision and actions that have helped make the Net possible. "Netizens" is a detailed description of the Net's construction and a step-by-step view of the past, present, and future of the Internet, the Usenet and the World Wide Web.
Book Synopsis Show Sold Separately by : Jonathan Gray
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.
Book Synopsis American Fertilizers by : Perry Eugene Howard
Download or read book American Fertilizers written by Perry Eugene Howard and published by . This book was released on 1932 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this publication is given a brief description of the production of commercial fertilizer. It is believed that this description, which complex technical discussion and statistics are avoided, will be of use to students, as well as farmers and gardeners.
Book Synopsis Contact With Space: Oranur; Second Report 1951 - 1956 by : Wilhelm Reich
Download or read book Contact With Space: Oranur; Second Report 1951 - 1956 written by Wilhelm Reich and published by . This book was released on 2018-10-27 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wilhelm Reich's final publication, Contact With Space contains the result of six years of intensive research and field work: a natural scientific account of and the basis of practical measures for combating the DOR emergency. This volume is an exposition of the newest developments in the technology of Cosmic Orgone Engineering, which involve the use of "Spacegun," an extension of the cloudbuster made possible by the discovery of ORUR.During Reich's scientific expedition to southern Arizona (1954-1955)--which he documents in this book--it was Cosmic Orgone Engineering that caused desert land to turn green with prairie grass. Here Reich submits a natural scientific explanation of the metabolism of the Life Energy, a study which goes into the nature of primal vegetation, and the nature of dying or death of vegetation, i.e., desert development.Nature being one, Contact With Space examines the new basic energetic facts brought into the open by the Oranur Experiment in terms of the various branches of science into which they ramify: biophysics, Oranur medicine, astrophysics, meteorology, chemistry and pre-atomic chemistry, space technology, man's reactions to these events, etc. It also deals with the methods of the functional scientist.Written under unrelenting attack from conspiratorial commercial interests, this book gives some of the background into the difficult social and physical milieu in which this research was done, and conveys the excitement of the adventures that began the cosmic or "atomic" age.
Book Synopsis The Columbia History of American Television by : Gary Richard Edgerton
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.
Book Synopsis Basic Elements of Narrative by : David Herman
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
