Download or read book Etude d un dispositif de contr le actif des fluctuations de d bits puls s utilisable comme silencieux written by Janick Laumonier and published by . This book was released on 1990 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'ENERGIE ACOUSTIQUE RAYONNEE PAR LES ECOULEMENTS PULSES (ECHAPPEMENT DE MOTEUR THERMIQUE, PAR EXEMPLE) EST LIEE PRINCIPALEMENT AU CARACTERE PULSATOIRE DE L'ECOULEMENT (MODULATION DU DEBIT). LA REDUCTION DE CES BRUITS NECESSITE DES METHODES PASSIVES LOURDES ("SILENCIEUX") ET N'EST ACTUELLEMENT PAS REALISABLE PAR LES METHODES D'ABSORPTION ACOUSTIQUE ACTIVE OU LES TRANSDUCTEURS UTILISES SONT INAPPROPRIES DANS LES BASSES FREQUENCES. NOUS PROPOSONS UN DISPOSITIF DE CONTROLE ACTIF DES FLUCTUATIONS DE DEBITS BASE SUR LE PRINCIPE D'UN ORGANE DE TYPE "PERTE DE CHARGE SINGULIERE" DONT ON CONTROLE, EN TEMPS REEL, LA POSITION. CE SYSTEME PERMET D'ATTENUER SENSIBLEMENT, A LA FREQUENCE FONDAMENTALE, LE TAUX DE PULSATION DU DEBIT EN AVAL DE LA SINGULARITE ET D'OBTENIR, EN CONSEQUENCE, UNE RESUCTION NOTABLE DES NIVEAUX SONORES RAYONNES A L'EMBOUCHURE. NOUS EN PRESENTONS LE PRINCIPE, LES RESULTATS PHENOMENOLOGIQUES ET LES CONSEQUENCES QUANT A SON AUTOMATISATION

Download or read book Une m thode originale de contr le actif des bruits d coulements puls s written by Laurent Hardouin and published by . This book was released on 1993 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'ENERGIE ACOUSTIQUE RAYONNEE PAR LES ECOULEMENTS PULSES EST PRINCIPALEMENT DUE AUX FLUCTUATIONS PERIODIQUES DU DEBIT. DANS LE CAS D'UN MOTEUR THERMIQUE QUI CONSTITUE LE GENERATEUR D'ECOULEMENTS PULSES LE PLUS REPANDU, CES FLUCTUATIONS SONT ENGENDREES PAR LES ECHAPPEMENTS SUCCESSIFS LIES AU MOUVEMENT DES PISTONS. LA REDUCTION DE CETTE NUISANCE NECESSITE DES SILENCIEUX PASSIFS DE TAILLE IMPORTANTE ET N'EST PAS REALISABLE A L'AIDE DES METHODES ACTIVES UTILISANT DES HAUT-PARLEURS. EN EFFET CES TRANSDUCTEURS SONT D'UNE PART PEU EFFICACES EN BASSES FREQUENCES ET D'AUTRE PART RELATIVEMENT FRAGILES (ILS NE RESISTENT PAS AUX TEMPERATURES ELEVEES). LE TRAVAIL PRESENTE ICI S'INSCRIT DANS LE CADRE DU DEVELOPPEMENT D'UN SYSTEME INNOVANT D'ATTENUATION ACTIVE DE CES NUISANCES ACOUSTIQUES. LE PRINCIPE REPOSE SUR LE CONTROLE INSTANTANE DES FLUCTUATIONS DE DEBITS A L'AIDE D'UNE VANNE MOBILE. LA MODELISATION ACOUSTIQUE DU SYSTEME ACTIF, QUI REPOSE SUR LES ANALOGIES ELECTRIQUES, FAIT APPARAITRE LA VANNE MOBILE COMME UN GENERATEUR EN SERIE AVEC LE GENERATEUR DE DEBITS PULSES. IL RESSORT EGALEMENT DE CETTE ETUDE UNE CERTAINE SIMILARITE CONCEPTUELLE DU DISPOSITIF AVEC LES SYSTEMES UTILISANT UN HAUT-PARLEUR. AFIN DE RENDRE CE SYSTEME CREDIBLE, UN PROTOTYPE TECHNIQUEMENT REALISTE EST DEVELOPPE. IL EST CONSTITUE D'UNE PART D'UN ACTIONNEUR SPECIFIQUEMENT ETUDIE POUR CE SYSTEME ET PROPOSE SOUS PLUSIEURS FORMES AFIN DE POUVOIR REPONDRE A UNE VASTE GAMME D'APPLICATIONS DU DISPOSITIF. LE PROTOTYPE COMPREND D'AUTRE PART UN ORGANE DE CONTROLE QUI A PERMIS DE DEVELOPPER UN CORRECTEUR ADAPTATIF. CE CONTROLE REPOSE SUR UNE COMMANDE INTITULEE MINIMUM DE VARIANCE GENERALISEE QUI EST IMPLANTEE SUR UN PROCESSEUR DE TRAITEMENT DE SIGNAL. QUELQUES-UNS DES MULTIPLES RESULTATS OBTENUS SONT FINALEMENT PRESENTES ET MONTRENT LES PERFORMANCES DU PROTOTYPE CONCERNANT D'UNE PART LES ATTENUATIONS DES FLUCTUATIONS PERIODIQUES DE DEBITS ET D'AUTRE PART LA POURSUITE DES VARIATIONS DES CARACTERISTIQUES DE LA SOURCE PRIMAIRE. LES INFORMATIONS ET LES INNOVATIONS TECHNOLOGIQUES APPORTEES PAR CE MEMOIRE PERMETTENT D'ENVISAGER A COURT TERME UN TRANSFERT DE TECHNOLOGIE VERS DES APPLICATIONS INDUSTRIELLES CONCRETES

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.

Download or read book Max Weber and Karl Marx written by Karl Lowith and published by Routledge. This book was released on 2002-11-01 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: First Published in 2004. Lowith's study of Max Weber and Karl Marx is a key text in modem interpretations of the theme of alienation in Marxist theory and rationalisation in Weber's sociology. It remains the best short student introduction to the differences and comparisons between these essential thinkers. This new edition includes a Preface by Professor Bryan S. Turner which demonstrates the relevance of the book for contemporary sociology.

Download or read book NATO Glossary of Terms and Definitions written by North Atlantic Treaty Organization and published by CreateSpace. This book was released on 2013-03-08 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: NATO Glossary of terms and definitions (English and French). Listing terms of military significance and their definitions for use in NATO.

Download or read book City of Man written by Michael Gerson and published by Moody Publishers. This book was released on 2010-10-01 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: An era has ended. The political expression that most galvanized evangelicals during the past quarter-century, the Religious Right, is fading. What's ahead is unclear. Millions of faith-based voters still exist, and they continue to care deeply about hot-button issues like abortion and gay marriage, but the shape of their future political engagement remains to be formed. Into this uncertainty, former White House insiders Michael Gerson and Peter Wehner seek to call evangelicals toward a new kind of political engagement -- a kind that is better both for the church and the country, a kind that cannot be co-opted by either political party, a kind that avoids the historic mistakes of both the Religious Left and the Religious Right. Incisive, bold, and marked equally by pragmatism and idealism, Gerson and Wehner's new book has the potential to chart a new political future not just for values voters, but for the nation as a whole.

Download or read book NATO Glossary of Abbreviations Used in NATO Documents and Publications written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Oxford Dictionary of English Grammar written by Bas Aarts and published by OUP Oxford. This book was released on 2014-01-16 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Oxford Dictionary of English Grammar is a straightforward and accessible A-Z guide to the diverse and often complex terminology of English grammar. It contains over 1,600 entries with clear and concise definitions, enhanced by numerous example sentences, as well as relevant quotations from the scholarly literature of the field. This second edition is written and edited by Professor Bas Aarts of University College London, writer of the acclaimed Oxford Modern English Grammar. It has been fully revised and updated, with particular attention paid to refreshing the example sentences included within the text. There are over 150 new entries that cover current terminology which has arisen since the publication of the first edition, and there are also new entries on the most important English grammars published since the start of the 20th century. Hundreds of new cross-references enhance the user-friendly nature of the text, and the list of works cited has been thoroughly updated to reflect the current state of the field. A short appendix of web links has been added. All in all, this Dictionary is an invaluable guide to English grammar for all students and teachers of the subject, as well as all those with an informed interest in the English language.

Download or read book Naval Arctic Manual written by and published by . This book was released on 1990 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Historical Dictionary of Iran written by John Henry Lorentz and published by Historical Dictionaries of Asia, Oceania, and the Middle East. This book was released on 2007 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an overview of specific events, movements, people, political and social groups, places, trends, and chronology. Allows for considerable exploration of a number of historical and contemporary topics and issues. The modern period, defined as 1800-present, is covered extensively.

Download or read book The Penguin Guide to Punctuation written by R L Trask and published by Penguin UK. This book was released on 2019-06-13 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Penguin Guide to Punctuation is indispensable for anyone who needs to get to grips with using punctuation in their written work. Whether you are puzzled by colons and semicolons, unsure of where commas should go or baffled by apostrophes, this jargon-free, succinct guide is for you.

Download or read book Simon Denny written by Simon Denny and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Simon Denny's new body of work for Portikus ranks among the most ambitious the artist has developed to date. Over the period of one year, the artist researched and developed an intricate project that has grown to considerable dimensions -- both physically and in terms of its critical content. For two months, the monumental gallery space is turned into an homage to technology, communication, and the relentless need for innovation. Simon Denny has produced an embracing and multi-faceted installation that functions as a documentary of the South Korean technology giant Samsung and its global success story. The exhibition's title, "New Management", refers to the legendary management philosophy that Lee Kun-hee, Chairman of the Samsung Group, infamously introduced in the early nineties."--Publisher's website.

Download or read book A Dictionary of Grammatical Terms in Linguistics written by R.L. Trask and published by Routledge. This book was released on 2013-04-15 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dictionary of grammatical terms covers both current and traditional terminology in syntax and morphology. It includes descriptive terms, the major theoretical concepts of the most influential grammatical frameworks, and the chief terms from mathematical and computational linguistics. It contains over 1500 entries, providing definitions and examples, pronunciations, the earliest sources of terms and suggestions for further reading, and recommendations about competing and conflicting usages. The book focuses on non-theory-boumd descriptive terms, which are likely to remain current for some years. Aimed at students and teachers of linguistics, it allows a reader puzzled by a grammatical term to look it up and locate further reading with ease.

Download or read book Usage and Abusage written by Eric Partridge and published by W. W. Norton & Company. This book was released on 1997 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: A handbook of advice on the proper use of the English language. Includes a section on vogue words that have acquired a power and influence beyond what they originally possessed.

Download or read book The Heidegger Change written by Catherine Malabou and published by SUNY Press. This book was released on 2011-12-01 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: Elaborates the author’s conception of plasticity by proposing a new way of thinking through Heidegger’s writings on change.

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.

Download or read book The Cassell Guide to Common Errors in English written by Harry Blamires and published by Burns & Oates. This book was released on 1999 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: The English language is a minefield of common errors and disputed points. Dealing with wide-ranging problems of grammar, syntax, punctuation, spelling, usage and style, all articles in this book have examples of incorrect usage, drawn from contemporary sources.