Download or read book ETUDE DE PLASMAS ISSUS DE L INTERACTION D UN ARC ELECTRIQUE AVEC DES MATERIAUX ISOLANTS written by OLGA.. KOUALTCHOUK and published by . This book was released on 1997 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: UNE NOUVELLE TECHNIQUE DE COUPURE A ETE MISE AU POINT DANS LES ANNEES 80, ELLE EST BASEE SUR LE LAMINAGE DE L'ARC ENTRE DES PAROIS ISOLANTES. LES INTERACTIONS QUI SE PRODUISENT PENDANT LA DECHARGE CONDUISENT A DES PLASMAS CONSTITUES PRINCIPALEMENT DE VAPEURS D'ISOLANT. DES ETUDES THEORIQUES MENEES AU LABORATOIRE ONT MONTRE L'INTERET DE MATERIAUX DE TYPE POLYMERE DE FORMULE GENERALE C#XH#YO#ZN#T. CE MEMOIRE EST CONSACRE A L'ETUDE EXPERIMENTALE DE L'INTERACTION ENTRE UN ARC ELECTRIQUE ET DES ISOLANTS DE TYPE POLYMENE: PE, POM, PMMA, PA 6-6. LE DISPOSITIF D'OBSERVATION ET DE MESURE EST CONSTITUE D'UNE CHAMBRE A ARC DANS LAQUELLE L'INTERACTION ENTRE L'ISOLANT ET L'ARC EST OBTENUE EN DEPLACANT CE DERNIER A L'AIDE D'UN CHAMP MAGNETIQUE. LA CONCEPTION DE CETTE CHAMBRE PERMET UNE ETUDE EN VISEE PERPENDICULAIRE ET PARALLELE A L'ARC LORS DE L'INTERACTION. POUR CHACUN DES ISOLANTS LES ETUDES SPECTROSCOPIQUES ONT PERMIS DE DETERMINER, POUR DIFFERENTS COURANTS D'ARC, LA DENSITE ELECTRONIQUE DU PLASMA, LA TEMPERATURE DES ESPECES ATOMIQUES (H, C) ET MOLECULAIRES (C#2, CN) ET CELLE DES ELECTRONS. LE CHAMP ELECTRIQUE DANS LE PLASMA A ETE EGALEMENT OBSERVE ET MESURE. LES RESULTATS EXPERIMENTAUX OBTENUS MONTRENT QUE: - LE PLASMA EST CONSTITUE PRATIQUEMENT UNIQUEMENT DE VAPEURS D'ISOLANT, - LA DENSITE ELECTRONIQUE ET LES TEMPERATURES DES ATOMES ET DES ELECTRONS CROISSENT AVEC LE COURANT, LES TEMPERATURES DES MOLECULES VARIENT PEU AVEC LE COURANT, - LA DENSITE ELECTRONIQUE EST PRATIQUEMENT INDEPENDANTE DU MONDE DE VISEE INDIQUANT UNE REPARTITION HOMOGENE AU SEIN DU PLASMA, - LE POM (DELRIN) PRESENTE UN COMPORTEMENT ORIGINAL ET EN PARTICULIER IL MONTRE LA MEILLEURE RESISTANCE A L'ATTAQUE DE L'ARC ET LA PLUS GRANDE EFFICACITE POUR LA COUPURE A FAIBLE COURANT. CES RESULTATS APPORTENT UNE VALIDATION AUX ETUDES THEORIQUES EFFECTUEES AU LABORATOIRE.
Download or read book ETUDE DES CARACTERISTIQUES DU PLASMA D UN ARC ELECTRIQUE CONTAMINE PAR DES VAPEURS ISSUES DE METAUX ET D ISOLANTS written by M'hammed Abbaoui and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LES CARACTERISTIQUES DES PLASMAS D'ARC ELECTRIQUE PEUVENT ETRE PROFONDEMENT MODIFIEES PAR LA PROXIMITE DES ELECTRODES ET DES ISOLANTS, PLUS PARTICULIEREMENT LORSQUE CES MATERIAUX SONT VAPORISES. LA CARACTERISATION THEORIQUE ET/OU EXPERIMENTALE DE TELS PLASMAS EST LE BUT DE CE TRAVAIL. UNE ETUDE THEORIQUE DE PLASMAS ARGON-METAL (OU ALLIAGE SANS OXYDES) ET AIR-METAL (OU ALLIAGE) DANS LA GAMME DE TEMPERATURE CORRESPONDANT AUX CONDITIONS EXPERIMENTALES, MET EN EVIDENCE L'EVOLUTION DE LA DENSITE NUMERIQUE DES DIFFERENTES ESPECES CHIMIQUES EN PRESENCE. CE CALCUL A ETE FAIT POUR DE NOMBREUX METAUX ET ALLIAGES (24 DANS L'ARGON ET 12 DANS L'AIR). UN MODELE D'UTILISATION SIMPLE A PERMIS DE CALCULER, AVEC UNE BONNE APPROXIMATION, LES CONDUCTIVITES ELECTRIQUE ET THERMIQUE DE CES DIFFERENTS PLASMA. L'ENSEMBLE DES RESULTATS OBTENUS, REVELE L'IMPORTANCE DE LA VALEUR DE L'ENERGIE DE PREMIERE IONISATION DU METAL DANS LA ZONE DE BASSE TEMPERATURE. UNE ETUDE EXPERIMENTALE A ETE FAITE SUR DES PLASMAS D'AIR ET D'ARGON, A PRESSION ATMOSPHERIQUE, EN PRESENCE D'ISOLANTS INDUSTRIELS. LA TEMPERATURE, LA DENSITE ELECTRONIQUE ET LE TEMPS D'EXTINCTION DE L'ARC SONT DETERMINES PAR SPECTROMETRIE; LE CHMAP ELECTRIQUE PAR UNE METHODE DE SONDES. L'ANALYSE DES RESULTATS EXPERIMENTAUX MONTRE L'INFLUENCE DES VAPEURS D'ISOLANTS SUR LES CARACTERISTIQUES DU PLASMA D'ARC
Download or read book CONTRIBUTION A L ETUDE EXPERIMENTALE ET THEORIQUE DES PLASMAS D ARCS ELECTRIQUES LAMINES written by Zacharie Koalaga and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LA TELEMECANIQUE ELECTRIQUE A MIS AU POINT UNE NOUVELLE TECHNIQUE DE COUPURE BASEE SUR LE LAMINAGE DE L'ARC ENTRE DEUX PIECES ISOLANTES. CE MODE DE COUPURE ENTRAINE DE FORTES INTERACTIONS ARC-PAROIS, ET CONDUIT A DES PLASMAS CONSTITUES ESSENTIELLEMENT DE VAPEURS D'ISOLANT. DE CE FAIT, LA NATURE DU MATERIAU DES PAROIS ET LA LARGEUR DE LA FENTE CONSTITUENT LES PARAMETRES LES PLUS IMPORTANTS DE CETTE METHODE DE COUPURE. L'ETUDE EXPERIMENTALE PRESENTEE EST UN PROLONGEMENT DE TRAVAUX EFFECTUES ANTERIEUREMENT AU LABORATOIRE. LES GRANDEURS PHYSIQUES MESUREES SONT LE COURANT, LA TENSION, LE CHAMP ELECTRIQUE ET LA PRESSION. LE CHOIX DU MATERIAU DES PAROIS EST FAIT EN CONSIDERANT LES VALEURS MAXIMALES DU COURANT ET SURTOUT DU CHAMP ELECTRIQUE. POUR UNE MEILLEURE EFFICACITE DE LA COUPURE, IL CONVIENT D'ATTEINDRE DES VALEURS DE CHAMP ELECTRIQUE TRES ELEVEES. LES POLYMERES SE REVELENT ETRE LES PLUS PROMETTEURS. UNE GRANDE PARTIE DE CE MEMOIRE EST CONSACREE A L'ETUDE THEORIQUE DES PLASMAS ISSUS DES ISOLANTS DE TYPE C#XH#YO#ZN#T. CETTE ETUDE PERMET LA DETERMINATION DE LA COMPOSITION D'EQUILIBRE, DES COEFFICIENTS DE TRANSPORT ET DES FONCTIONS THERMODYNAMIQUES DE CES PLASMAS. LE CALCUL DES DIFFERENTES PROPRIETES DES PLASMAS DU TYPE C#XH#YO#ZN#T EST EFFECTUEE GRACE A UN LOGICIEL DE CALCUL ELABORE AU LABORATOIRE. IL EST POSSIBLE D'EFFECTUER UN CHOIX DU MATERIAU DES PAROIS A PARTIR DES VALEURS DES CONDUCTIVITES THERMIQUE () ET ELECTRIQUE (), DE LA DENSITE D'ENERGIE (.H) ET DU FLUX DE PUISSANCE (.H.A.)
Download or read book Canadian Journal of Physics written by and published by . This book was released on 1992 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Caract risation exp rimentale d un plasma d arc et de son interaction avec les lectrodes written by Ravo Ramanantsoa and published by . This book was released on 2011 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'arc électrique est utilisé comme source d'énergie dans de nombreux procédés industriels comme la soudure ou la découpe de matériaux métalliques. Dans la plupart de ces applications, la connaissance et la quantification du transfert d'énergie entre le plasma d'arc et les divers constituants du système sont primordiales en vue de mieux contrôler et d'optimiser les procédés. Deux approches complémentaires peuvent être utilisées pour ces études : la modélisation et les mesures expérimentales. Ces travaux de thèses ont consisté à réaliser des mesures sur différentes configurations d'arc transféré avec deux objectifs : le premier d'étudier et de caractériser en fonction du temps l'interaction de l'arc avec les électrodes et les matériaux avoisinants, le second de fournir des jeux de données les plus complets possibles afin de pouvoir valider les modèles. Le transfert d'énergie plasma-électrode est quantifié à partir d'une approche inverse développée en tenant compte de l'aspect temporel. Les mesures expérimentales couplées à ces méthodes ont permis d'obtenir la part d'énergie transférée aux électrodes. Des mesures spectroscopiques ont été effectuées en complément au niveau du plasma pour le caractériser et d'établir ainsi un bilan global de l'énergie mise en jeu.
Download or read book tude des caract ristiques du plasma d un arc lectrique contamin par des vapeurs issues de m taux et d isolants written by M'hammed Abbaoui (auteur d'une thèse de sciences.) and published by . This book was released on 1984 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Download or read book Materials and Surface Engineering in Tribology written by Jamal Takadoum and published by John Wiley & Sons. This book was released on 2013-05-10 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: This title is designed to provide a clear and comprehensive overview of tribology. The book introduces the notion of a surface in tribology where a solid surface is described from topographical, structural, mechanical, and energetic perspectives. It also describes the principal techniques used to characterize and analyze surfaces. The title then discusses what may be called the fundamentals of tribology by introducing and describing the concepts of adhesion, friction, wear, and lubrication. The book focuses on the materials used in tribology, introducing the major classes of materials used, either in their bulk states or as coatings, including both protective layers and other coatings used for decorative purposes. Of especial importance to the tribology community are sections that provide the latest information on Nanotribology, Wear, Lubrication, and Wear-Corrosion: Tribocorrosion and Erosion-Corrosion.
Download or read book The Origin of Clay Minerals in Soils and Weathered Rocks written by Bruce B. Velde and published by Springer Science & Business Media. This book was released on 2008-07-18 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of huge relevance in a number of fields, this is a survey of the different processes of soil clay mineral formation and the consequences of these processes concerning the soil ecosystem, especially plant and mineral. Two independent systems form soil materials. The first is the interaction of rocks and water, unstable minerals adjusting to surface conditions. The second is the interaction of the biosphere with clays in the upper parts of alteration profiles.
Download or read book An Introduction to Differential Manifolds written by Jacques Lafontaine and published by Springer. This book was released on 2015-07-29 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an introduction to differential manifolds. It gives solid preliminaries for more advanced topics: Riemannian manifolds, differential topology, Lie theory. It presupposes little background: the reader is only expected to master basic differential calculus, and a little point-set topology. The book covers the main topics of differential geometry: manifolds, tangent space, vector fields, differential forms, Lie groups, and a few more sophisticated topics such as de Rham cohomology, degree theory and the Gauss-Bonnet theorem for surfaces. Its ambition is to give solid foundations. In particular, the introduction of “abstract” notions such as manifolds or differential forms is motivated via questions and examples from mathematics or theoretical physics. More than 150 exercises, some of them easy and classical, some others more sophisticated, will help the beginner as well as the more expert reader. Solutions are provided for most of them. The book should be of interest to various readers: undergraduate and graduate students for a first contact to differential manifolds, mathematicians from other fields and physicists who wish to acquire some feeling about this beautiful theory. The original French text Introduction aux variétés différentielles has been a best-seller in its category in France for many years. Jacques Lafontaine was successively assistant Professor at Paris Diderot University and Professor at the University of Montpellier, where he is presently emeritus. His main research interests are Riemannian and pseudo-Riemannian geometry, including some aspects of mathematical relativity. Besides his personal research articles, he was involved in several textbooks and research monographs.
Download or read book AGARD Conference Proceedings written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeronomy written by P. M. Banks and published by Elsevier. This book was released on 2013-09-24 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aeronomy, Part A is an attempt to make a comprehensive exposition of the processes in aeronomy, the study of composition, movement, and thermal balance of the upper regions of the planetary atmosphere. The text covers topics such as atmospheric regions and atmospheric density, the temperature and molecular mass of the atmosphere; the permanent constituents and the molecular and isotonic composition of the homosphere; and the transition from the homosphere to the heterosphere. Also covered are topics such as the temperature gradient and energies in the thermosphere, conditions at 200km and above 250km, solar radiation and ionization, and aeronomic reactions. The book is recommended for scientists, especially natural physicists, who would like to know more about the field of aeronomy and its advances.
Download or read book Precision Measurement and Fundamental Constants Proceedings written by United States. National Bureau of Standards and published by . This book was released on 1971 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Introduction To Plasmonics written by Olivier Pluchery and published by World Scientific. This book was released on 2023-08-28 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: What is a plasmon? Is it a particle, like a photon or a wave? Plasmonics stands at the frontier of condensed matter physics, which is the world of electrons, optics and of photons. Plasmonics is one of the most active fields in nanophotonics. This book begins by exploring the concepts behind waves, and the electromagnetic description of light when it interacts with metals; it dedicates every chapter thereafter to all aspects of plasmonics. In particular, the surface plasmon polariton wave is explained in full detail, as well as the localized surface plasmon resonance of metallic nanoparticles. The active research area opened by plasmonics, as well as its applications, are also briefly explained, such as advanced biosensing, subwavelength waveguiding, quantum plasmonics, nanoparticle-based cancer therapies, optical nano-antenna and high-efficiency photovoltaic cells.The book is adapted for graduate students and places a special emphasis on providing complete explanations of the fundamental concepts of plasmonics. Further, each of these concepts is illustrated with examples drawn from the most recent scientific literature. Each chapter ends with a set of exercises that will help the reader revise the concepts and go deeper into the world of plasmonics. More than 70 exercises are included.
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 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.
