Download or read book D p t chimique en phase vapeur de silice dans une post d charge micro onde de grand diam tre written by Florence Naudin and published by . This book was released on 2000 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: DES COUCHES MINCES DE SILICE SONT OBTENUES DANS UN REACTEUR PECVD MICRO-ONDE DE GRAND DIAMETRE, FONCTIONNANT EN MODE POST-DECHARGE, PAR REACTION ENTRE UN GAZ PLASMAGENE (OXYGENE) ET UN GAZ PRECURSEUR (SIH 4/AR). UNE ETUDE PARAMETRIQUE PERMET DE DETERMINER UN POINT DE FONCTIONNEMENT (1600 W ; 0,13 MBAR ; R = 160 RAPPORT DU DEBIT D'OXYGENE ET DU SILANE ; 150\C) CONDUISANT A DES FILMS ADHERENTS DE SILICE AMORPHE DE DENSITE VOISINE DE LA VALEUR THEORIQUE (2,2). DEUX DIAGNOSTICS SONT EMPLOYES POUR CARACTERISER LA DECHARGE ET LA POST-DECHARGE. LES ESPECES IDENTIFIEES PAR SPECTROMETRIE D'EMISSION OPTIQUE PROVIENNENT DU GAZ PLASMAGENE (O, O 2 + ET O 2), DE LA DISSOCIATION DU SILANE (H, SIH) ET DE RECOMBINAISONS EN PHASE GAZEUSE (SIO, OH). LES RESULTATS METTENT EN EVIDENCE QUE LA ZONE DE DEPOT N'EST PAS UNE REELLE POST-DECHARGE ET QU'IL EXISTE DES RECIRCULATIONS DE GAZ PRECURSEUR DANS LE PLASMA. LA TEMPERATURE DU GAZ, DEDUITE DU SPECTRE ROTATIONNEL DE LA BANDE ATMOSPHERIQUE, EST DE L'ORDRE DE 650 A 700 K. LA DENSITE ET LA TEMPERATURE DES ELECTRONS, MESUREES PAR DOUBLE SONDE ELECTROSTATIQUE, PRECISENT QUE LA ZONE DE DEPOT EST UN DOMAINE TRANSITOIRE ENTRE LA DECHARGE ET LA PROCHE POST-DECHARGE. LA MODELISATION DU REACTEUR COMPORTE DEUX PRINCIPALES PARTIES DISTINCTES. UNE ETUDE AERODYNAMIQUE, METTANT EN UVRE UN CODE DE CALCUL NUMERIQUE (ESTET) EN VUE D'OPTIMISER L'INJECTION DU GAZ PRECURSEUR ET DE DEFINIR LE REGIME D'ECOULEMENT, MONTRE QUE L'ECOULEMENT EST PERTURBE ET COMPLEXE. UN MODELE ELECTROMAGNETIQUE, DEVELOPPE PAR L'IRCOM, REVELE QUE LE CHAMP ELECTRIQUE, PRINCIPALEMENT REPARTI DANS LES GAINES ELECTROSTATIQUES ET EN PERIPHERIE DU QUARTZ, SE PROPAGE PEU DANS LA POST-DECHARGE. L'EXCITATION CHOISIE ASSURE DONC UN EXCELLENT COUPLAGE MICRO-ONDE/PLASMA.
Download or read book D p t chimique en phase vapeur d oxyde de silicium dans une post d charge micro onde written by Hèlène Del Puppo and published by . This book was released on 1992 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: DES MELANGES O#2/SIH#4 ET N#2O/SIH#4 ONT ETE UTILISES POUR DEPOSER SIO#2 DANS UNE POST-DECHARGE MICRO-ONDE A BASSE TEMPERATURE (
Download or read book D p t de couches minces de SiCN par d pot chimique en phase vapeur assist par plasma micro onde written by Simon Bulou and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les films à base de Si, C et N présentent de très intéressantes propriétés mécaniques, optiques et électroniques. L'objectif de ce travail est de mettre au point le procédé de dépôt chimique en phase vapeur assisté par plasma micro-onde permettant l'élaboration, à partir d'hexaméthyldisilazane (HMDSN), de films minces de SiCN dont l'indice de réfraction et le gap peuvent être modulés en modifiant des paramètres expérimentaux. Un mélange à base de N2/Ar/HMDSN permet le dépôt de films durs, adhérents et transparents. Ceux-ci sont de type SiNx:H avec une faible teneur en carbone (
Download or read book Caract risation d une d charge micro onde puls e dans le m lange CH4 H2 en vue de son optimisation pour la synth se de films de diamant written by Ludovic de Poucques and published by . This book was released on 2000 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le diamant possédant des propriétés physico-chimiques exceptionnelles, il est un excellent candidat pour des applications en optique et en électronique destinées à travailler dans des conditions extrêmes (haute puissance, haute fréquence et haute température). Ces applications nécessitant la synthèse de films de diamant d'une très grande pureté, de nombreuses investigations ont permis de montrer que le meilleur procédé de synthèse est le dépôt chimique en phase vapeur assisté par plasma micro-onde (MWPA CVD). L'originalité de ce travail est l'étude de l'effet des décharges micro-onde pulsées (temps de décharge et temps de post-décharge) sur la réactivité du plasma et les propriétés des films de diamant. Afin de mener,cette étude, l'analyse des échantillons a été réalisée par microscopie électronique à balayage (SEM) et spectroscopie Raman. L'analyse des films de diamant déposés a montré qu'un optimum de qualité est atteint sans perte de vitesse de croissance, pour un temps de décharge et un temps de post-décharge égaux et valant 1 ms. En ce qui concerne la caractérisation du plasma, nous avons utilisé la fluorescence induite par laser (LIF) à deux photons, la spectroscopie optique d'émission résolue dans le temps (TROES), l'actinométrie et une technique (appelée technique du "double pulse") qui permet de réexciter les atomes (ou molécules) en post-décharge. La caractérisation des plasmas a permis de corréler l'influence des temps de décharge et de post-décharge sur la composition de la phase gazeuse et les dépôts. L'étude spatio-temporelle des principales espèces réactives montre que le choix des temps de décharge et de post-décharge nous permet de contrôler leurs concentrations. De plus, nous avons mis en évidence que les plasmas pulsés nécessitent une caractérisation spatio-temporelle car les principaux mécanismes gouvernant ce type de plasmas sont la diffusion des espèces (neutres et chargées) et le chauffage ou le refroidissement du gaz.
Download or read book Adhesion Between Polymers and Concrete Adh sion Entre Polym res Et B ton written by H. R. Sasse and published by Springer. This book was released on 1986 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preface Adhesion is a phenomenon architects and civil engineers are not very familiar with. In other disciplines knowledge about surface properties and the background of bonding energies is also far from satisfactory; nevertheless there are many important· applications in concrete engineering, where adhesion is necessary for success and durability. These include: - coating and painting - repair of concrete surfaces - bonding of fresh to old concrete - crack injection - glueing of precast elements - glueing of steel to concrete, etc. In 1981 RILEM established the technical committee 52-RAC 'Resin Adherence to Concrete'. The main aims of the committee's work were - to collect research results and practical experiences - to initiate and coordinate research programs - to develop, on a scientific base, test methods for field and for laboratory purposes. One of the results of the committee's work is a state-of-the-art report, which will be presented orally as a General Report at the International Symposium ISAP '86, and will be printed either in the RILEM journal Materials and Structures or separately. Several test recommendations have been elaborated and will be prepared as drafts for the participants ofISAP '86. These are: - direct tensile test - pull-off test - direct shear test - slant shear test - four-point bending test - dynamic loading test - thermal compatibility test (two versions) - injectibility test.
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 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 UNESCO General History of Africa Vol I Abridged Edition written by Jacqueline Ki-Zerbo and published by Univ of California Press. This book was released on 1990 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This volume covers the period from the end of the Neolithic era to the beginning of the seventh century of our era. This lengthy period includes the civilization of Ancient Egypt, the history of Nubia, Ethiopia, North Africa and the Sahara, as well as of the other regions of the continent and its islands."--Publisher's description
Download or read book Properties of UO2 written by J. Belle and published by . This book was released on 1957 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Livestock Policy Analysis written by International Livestock Research Institute and published by ILRI (aka ILCA and ILRAD). This book was released on 1995-01-01 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Policy concepts; Identification of policy issues; Production systems, supply and demand; Market, price and trade policies; Marketing and distribution systems; Budget and manpower planning; Land tenure police for the livestock sector; Policy analysis report writing and communication; Livestock production and marketing in alphabeta - a case study.
Download or read book Diffusion in Materials DIMAT 2011 written by Igor Bezverkhyy and published by Trans Tech Publications Ltd. This book was released on 2012-04-12 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Conference on Diffusion in Materials (DIMAT) is the benchmark conference series for diffusion in solids. DIMAT 2011 was organized by the University of Bourgogne in association with CNRS, Dijon (France). The conference showcased new results concerning theoretical tools as well as applied research approaches. Diffusion processes affect all types of materials: nanomaterials, materials for energy, metallurgy, glasses and ceramics, but each requires its own numerical tools. Volume is indexed by Thomson Reuters CPCI-S (WoS). This volume comprises most of the contributions presented at DIMAT 2011: 4 plenary lectures delivered by famous high-level scientists plus 88 contributions in the form of keynote lectures, talks and posters.
Download or read book Agricultural English written by Georgeta Raţă and published by Cambridge Scholars Publishing. This book was released on 2012-04-25 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Agricultural English is a collection of essays on the English of Agriculture. The approach is a linguistic one: the different aspects of the English used in the field of agriculture (agricultural practices, agricultural systems) and in some fields related to agriculture (agricultural zoology, agri-tourism, biology, botany, ecology, entomology, gastronomy, land measurement, plant pathology, zoology) are analysed from a morphological (combination, derivation), syntactical (nominal phrases, verbal phrases), lexical and lexicographical, semantic (homonymy, semantic fields, synonymy, terminology), pragmatic (academic discourse, idiom, metaphor), etymological (etymon, Latin heritage), and contrastive (English–Croatian, English–French, English–German, English–Romanian, Romanian–English) points of view. The book will appeal to agriculturists, animal breeders, professors, researchers, students, and translators from Croatian-, English-, French-, German-, and Romanian-speaking countries, active in their own countries or abroad. The types of academic readership it would appeal to include academic teaching staff, researchers and students in the fields of agriculture and related fields – agricultural zoology, agri-tourism, biology, botany, ecology, entomology, gastronomy, land measurement, plant pathology, and zoology.
Download or read book Advanced Micro Mesoporous Materials written by K. Hadjiivanov and published by Heron Press. This book was released on 2008-10-31 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physical Properties of Amorphous Materials written by David Adler and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Institute for Amorphous Studies was founded in 1982 as the international center for the investigation of amorphous mate rials. It has since played an important role in promoting the und er standing of disordered matter in general. An Institute lecture series on "Fundamentals of Amorphous Materials and Devices" was held during 1982-83 with distinguished speakers from universities and industry. These events were free and open to the public ,and were attended by many representatives of the scientific community. The lectures themselves were highly successful inasmuch as they provided not only formal instruction but also an opportunity for vigorous and stimulating debate. That last element could not be captured within the pages of a book I but the lectures concentrated on the latest advances in the field I which is why their essential contents are he re reproduced in collective form. Together they constitute an interdisciplinary status report of the field. The speakers brought many different viewpoints and a variety of back ground experiences io bear on the problems involved I but though language and conventions vary I the essential unity of the concerns is very clear I as indeed are the ultimate benefits of the many-sided approach.
Download or read book Syria and Iran written by James W. Allan and published by Oxford University Press, USA. This book was released on 1987 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume includes new findings on Tell Minis Ware, a hitherto unrecognized class of 12th-century Syrian pottery; glazed ceramics in medieval Iran; and ceramics excavated at the site of medieval Sirjan in Kirman province.
Download or read book Cypriot medieval ceramics reconsiderations and new perspectives written by Dēmētra Papanikola-Bakirtzē and published by . This book was released on 2014 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modelling and Simulation in Thermal and Chemical Engineering written by J. Thoma and published by Springer Science & Business Media. This book was released on 2000 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main object of this book is modeling and simulation of energetic processes by bond graphs. But even without knowledge of this powerful method it can be used to a certain extent as an introduction to simulation in thermodynamics. The book addresses advanced students, lecturers and researchers in mechanical engineering and automation as well as experienced engineers in process industries.
