Conception d'un dispositif détecteur-actionneur pour le réseau de distribution électrique, à partir de la technologie des alliages à mémoire de forme PDF Download
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Author: Daniel Gagnon
Publisher:
ISBN:
Category :
Languages : fr
Pages : 146
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Author: Daniel Gagnon
Publisher:
ISBN:
Category :
Languages : fr
Pages : 146
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Book Description
Author: Hubert Kihl
Publisher:
ISBN:
Category :
Languages : fr
Pages : 16
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Book Description
DANS CETTE ETUDE NOUS PRESENTONS LES CARACTERISTIQUES ELECTRIQUES ET MECANIQUES DES ALLIAGES A MEMOIRE DE FORME AFIN DE PRECISER LEURS POTENTIALITES D'UTILISATION DANS LE DOMAINE DE LA ROBOTIQUE POUR LA CONCEPTION DE CAPTEURS DE POSITION, D'ACTIONNEURS OU D'ACTIONNEURS-CAPTEURS ASSERVIS EN POSITION. NOTRE OBJECTIF CONSISTE EGALEMENT A DETERMINER LES LIMITES D'UTILISATION DE CES ALLIAGES ET A DEFINIR LES INCONVENIENTS LIES A LEUR MISE EN UVRE. APRES UNE RECHERCHE BIBLIOGRAPHIQUE COMPLETE SUR LES DIFFERENTES CARACTERISTIQUES DES ALLIAGES A MEMOIRE DE FORME ET SUR LEURS APPLICATIONS, NOUS AVONS FAIT UNE ANALYSE DE LEUR COMPORTEMENT. POUR CELA NOUS EN AVONS EFFECTUE UNE MODELISATION STATIQUE ET DYNAMIQUE QUI NOUS A PERMIS DE MONTRER QUE LA REPONSE DES ALLIAGES DE CU-ZN-AL LORS DE LA CHAUFFE ET DU REFROIDISSEMENT EST DU DEUXIEME ORDRE ET QUE LES CONSTANTES DE TEMPS CORRESPONDANTES SONT DANS LES DEUX CAS DES FONCTIONS DE LA PUISSANCE DE CHAUFFE ET DE LA CONTRAINTE. PUIS NOUS CARACTERISONS LE COMPORTEMENT DES ALLIAGES A MEMOIRE DE FORME UTILISES COMME CAPTEURS DE DEPLACEMENT. LA MESURE DE LEUR VARIATION DE LONGUEUR EST DETERMINEE A PARTIR DE LA VARIATION DE RESISTIVITE OCCASIONNEE PAR LA TRANSFORMATION DE PHASE D'UN FIL EN ALLIAGE DE CU-ZN-AL, QUI EST PROVOQUEE PAR L'ALLONGEMENT DE CELUI-CI. CETTE ETUDE FAIT EGALEMENT APPARAITRE L'INFLUENCE QUE PEUT AVOIR LA VARIATION DE TEMPERATURE SUR LES CARACTERISTIQUES QUI LIENT L'ALLONGEMENT A LA RESISTIVITE ET A LA CONTRAINTE. CETTE INFLUENCE DE LA VARIATION DE TEMPERATURE PEUT ETRE SUPPRIMEE PAR L'UTILISATION DE LA METHODE DE MESURE DIFFERENTIELLE. LA SYNTHESE DES RESULTATS OBTENUS LORS DE CETTE ETUDE A PERMIS LA REALISATION D'UN AXE ASSERVI, UTILISANT LES ALLIAGES A MEMOIRE DE FORME EN CU-ZN-AL COMME ACTIONNEUR ET COMME CAPTEUR.
Author: Canada. Patent Office
Publisher:
ISBN:
Category : Copyright
Languages : en
Pages : 1070
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Author: Paolo Mele
Publisher:
ISBN: 9781536160864
Category : Zinc oxide thin films
Languages : en
Pages : 0
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Book Description
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.
Author: Great Britain: Parliament: House of Commons: Transport Committee
Publisher: The Stationery Office
ISBN: 9780215038319
Category : Business & Economics
Languages : en
Pages : 134
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Book Description
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.
Author: Perry Eugene Howard
Publisher:
ISBN:
Category : Fertilizer industry
Languages : en
Pages : 26
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Book Description
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.
Author: Emma Carlson Berne
Publisher: Referencepoint Press
ISBN: 9781601520197
Category : Science
Languages : en
Pages : 118
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Book Description
Throughout the world, the cause and impact of global warming and climate change is being passionately debated. While many claim that a climate crisis is imminent if greenhouse gases are not curbed, others argue that the effects have been overblown. Through objective overviews, primary sources, and full-color illustrations, this title will examine What Is Global Warming and Climate Change? What Are the Consequences of Global Warming? What Are the Controversies Surrounding Global Warming? What Are the Solutions for Global Warming?
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 472
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Author: United States. Congressional Budget Office
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 116
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Book Description
Author: United States. Health Care Financing Administration. Division of Finance
Publisher:
ISBN:
Category : Health services
Languages : en
Pages : 262
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Book Description
