Download or read book tude sur la cin tique des d fauts structuraux dans le silicium amorphe written by Jean-François Joly and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse présente à la fois des résultats de simulations numériques en plus de ré- sultats expérimentaux obtenus en laboratoire sur le rôle joué par les défauts de structure dans le silicium amorphe. Nos travaux de simulation numérique furent réalisés avec une nouvelle méthode de simulation Monte-Carlo cinétique pour décrire l'évolution tempo- relle de modèles de silicium amorphe endommagés sur plusieurs échelles de temps jus- qu'à une seconde à la température pièce. Ces simulations montrent que les lacunes dans le silicium amorphe sont instables et ne diffusent pas sans être détruites. Nous montrons également que l'évolution d'un modèle de silicium amorphe endommagé par une colli- sion ionique lors d'un recuit peut être divisée en deux phases : la première est dominée exclusivement par la diffusion et la création/destruction de défauts de liaison, alors que la deuxième voit les créations/destructions de liens remplacées par des échanges de liens entre atomes parfaitement coordonnés. Les défauts ont aussi un effet sur la viscosité du silicium amorphe. Afin d'approfondir cette question, nous avons mesuré la viscosité du silicium amorphe et du silicium amorphe hydrogéné sous l'effet d'un faisceau d'ions. Nous montrons que la variation de la viscosité dans les deux matériaux est différente : le silicium amorphe hydrogéné a une viscosité constante en fonction de la fluence des ions alors que le silicium amorphe pur a une viscosité qui augmente de façon linéaire. Pour de faibles fluences, la viscosité du silicium hydrogéné est plus grande que la viscosité sans hydrogène. La présence d'hydrogène diminue également l'amplitude de la variation logarithmique de la contrainte observée lors de la relaxation à la température de la pièce.
Download or read book tude de la formation d agr gats de d fauts ponctuels et d impuret s de lithium dans le silicium cristallin par m thodes Monte Carlo cin tique written by Mickaël Trochet and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse est composée de trois articles scientifiques et est séparée en deux parties : «Théorie, Méthodologie et Algorithmie» et «Simulations, Analyses et Résultats». Elle présente nos travaux sur les méthodes numériques atomistiques ainsi que leur application à des systèmes à base de silicium cristallin. La première partie, composée de trois chapitres, introduit la problématique des processus activés suivis de l'utilisation de la théorie de l'état de transition permettant d'aborder cette thématique. On enchaînera sur les points clés de la méthode de Monte-Carlo cinétique, avec une revue historique des avancées qui ont été faites jusqu'à ce jour. Le second chapitre présente la Technique d'Activation-Relaxation cinétique (ARTc), un algorithme de Monte-Carlo cinétique (KMC) hors réseau avec construction \textit{à la volée} du catalogue des transitions à partir de la Technique d'Activation-Relaxation nouveau (ARTn). ARTn est une méthode de recherche de point de selle sans connaissance a priori de la destination finale. Elle capture entièrement les potentiels effets élastiques pouvant être causés par la présence de défauts ou d'impuretés dans le voisinage proche ou lointain de la région analysée. La première partie se termine par notre premier article, qui traite en détail les récentes additions algorithmiques, de ces cinq dernières années, apportées à ARTc. S'en suit la seconde partie, composée aussi de trois chapitres, dont le quatrième chapitre est une mise en contexte comportant : les propriétés de base du silicium telles que ses phases cristallines; une définition des différents types de défauts ponctuels existant dans les cristaux; une présentation des potentiels interatomiques utilisés; une introduction sur le phénomène du bruit télégraphique; les phases binaires c-LiSi; une discussion sur l'amorphisation rapide de l'anode de c-Si lors de la première lithiation. Le cinquième chapitre explique l'agrégation et détaille les chemins de diffusions des défauts intrinsèques dans le silicium cristallin. La caractérisation d'amas de défauts intrinsèques et les différentes transitions présentées dans le cinquième chapitre ainsi que les travaux de Jay \textit{et al.} ~\cite{Jay2017} ont permis d'identifier une des causes responsables du phénomène de bruit télégraphique (RTS) observé dans les semi-conducteurs fortement endommagés. En effet, le mouvement oscillatoire des états non-diffusifs de certains agrégats de défauts intrinsèques de petites tailles, dont les niveaux d'énergies sont non-dégénérés, peut être associé aux fluctuations en tension ou en courant mesurées dans ces matériaux. Le sixième chapitre caractérise les états d'énergies des différentes configurations de systèmes à faibles concentrations d'impureté de lithium dans le silicium cristallin. Nous montrons à l'aide d'ARTc que les impuretés de lithium interagissent très faiblement entre elles, les agrégats formés étant aussitôt dissociés dus à une contribution non négligeable d'entropie configurationnelle.
Download or read book Environnement local des d fauts structurels et ordre moyenne port e dans le silicium amorphe written by Paule Dagenais and published by . This book was released on 2014 with total page 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 Layer Silicates written by Sturges W. Bailey and published by . This book was released on 1967 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geopolymers written by J L Provis and published by Elsevier. This book was released on 2009-06-22 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt: A geopolymer is a solid aluminosilicate material usually formed by alkali hydroxide or alkali silicate activation of a solid precursor such as coal fly ash, calcined clay and/or metallurgical slag. Today the primary application of geopolymer technology is in the development of reduced-CO2 construction materials as an alternative to Portland-based cements. Geopolymers: structure, processing, properties and industrial applications reviews the latest research on and applications of these highly important materials.Part one discusses the synthesis and characterisation of geopolymers with chapters on topics such as fly ash chemistry and inorganic polymer cements, geopolymer precursor design, nanostructure/microstructure of metakaolin and fly ash geopolymers, and geopolymer synthesis kinetics. Part two reviews the manufacture and properties of geopolymers including accelerated ageing of geopolymers, chemical durability, engineering properties of geopolymer concrete, producing fire and heat-resistant geopolymers, utilisation of mining wastes and thermal properties of geopolymers. Part three covers applications of geopolymers with coverage of topics such as commercialisation of geopolymers for construction, as well as applications in waste management.With its distinguished editors and international team of contributors, Geopolymers: structure, processing, properties and industrial applications is a standard reference for scientists and engineers in industry and the academic sector, including practitioners in the cement and concrete industry as well as those involved in waste reduction and disposal. - Discusses the synthesis and characterisation of geopolymers with chapters covering fly ash chemistry and inorganic polymer cements - Assesses the application and commercialisation of geopolymers with particular focus on applications in waste management - Reviews the latest research on and applications of these highly important materials
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 Agrochimica written by International Atomic Energy Agency and published by . This book was released on 1977 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic matter and soil productivity; Turnover of plant residues; Mineralization of organic compounds; Dynamics of organic forms of nitrogen; Nitrogen economy; Biodegradation of organic matter; Biochemical transformation of organic matter; Bitumens in soil organic matter; Characterization of humic acids; Carbon dating; Modern techniques and their implact on soil organic matter research; Sludge; Soil organic matter components and plant metabolism; Interaction between agrochemicals and organic matter; Peat.
Download or read book Interfacial Transition Zone in Concrete written by J.C. Maso and published by CRC Press. This book was released on 2004-03-01 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: An important new state-of-the-art report prepared by RILEM Technical Committee 108 ICC. It has been written by a team of leading international experts from the UK, USA, Canada, Israel, Germany, Denmark, South Africa, Italy and France. Research studies over recent years in the field of cement science have focused on the behaviour of the interfaces between the components of cement-based materials. The techniques used in other areas of materials science are being applied to the complex materials found in cements and concretes, and this book provides a significant survey of the present state of the art.
Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Download or read book Some Nanomaterials and Some Fibres written by International Agency for Research on Cancer and published by IARC Monographs on the Evaluat. This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume of the IARC Monographs provides an assessment of the carcinogenicity of fluoro-edenite fibrous amphibole, silicon carbide fibres and whiskers, and carbon nanotubes, including single-walled and multiwalled types. None of these agents had been assessed previously by the IARC Monographs Working Group. The Working Group relied mainly on epidemiological studies to evaluate the carcinogenic hazard to humans exposed to fluoro-edenite fibrous amphibole, an environmental contaminant that was reported to cause mesothelioma in the regional population of Biancavilla, Sicily, Italy. Silicon carbide fibres are by-products of the manufacture of silicon carbide particles by the Acheson process; silicon carbide whiskers are produced by other processes. The evaluations of the fibres and of the occupational exposures associated with the Acheson process were mainly based on epidemiological studies, whereas the assessment of the whiskers--in the absence of epidemiological--was based on carcinogenicity bioassays and consideration of their physical properties. In view of the absence of epidemiological studies on carbon nanotubes and the limited information available from mechanistic data, the evaluations of single-walled and multiwalled carbon nanotubes relied essentially on carcinogenicity bioassays.
Download or read book Glass Science written by R. H. Doremus and published by Wiley-Interscience. This book was released on 1994-04 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This Second Edition of Robert H. Doremus's classic, Glass Science, has been extensively revised and updated to reflect recent advances, while retaining the pedagogical structure that made its predecessor a superb tool for both teaching and professional research. Special emphasis is placed on areas of research that have been particularly active in recent years. Two new chapters have been added: one covers chemical durability [the reaction of glass with water], which includes recent work related to corrosion of glass and radioactive waste disposal: the other concerns the reaction of gasses with glass, especially oxygen. Other new or expanded discussions cover recent advances in the structure of glass, zirconium fluoride glasses, and electrical conductivity of glass.".
Download or read book Ceramics Glass and Glass Ceramics written by Francesco Baino and published by Springer Nature. This book was released on 2021-10-22 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a state-of-the-art overview of the major aspects involved in the science, technology and applications of ceramics, glasses and glass-ceramics. After providing an historical perspective of the development and use of ceramics and glasses along the Silk Road, the theoretical background and fabrication techniques of such materials are described and discussed. A special focus is dedicated to emerging high-tech applications in various fields, including medicine, energy, optics and photonics, sensors, sustainability and circular economy. The chapters are written by leading experts in their respective fields and highlight the contemporary challenges associated to each topic. This book will serve as a valuable reference for both early-stage and skilled researchers as well as industry professionals interested in the broad field of glasses and ceramics.
Download or read book Nonlinear Optical Materials written by Jerome V. Moloney and published by Springer Science & Business Media. This book was released on 1998-08-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
Download or read book How Things Work written by Louis A. Bloomfield and published by John Wiley & Sons. This book was released on 2015-12-15 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: How Things Work provides an accessible introduction to physics for the non-science student. Like the previous editions it employs everyday objects, with which students are familiar, in case studies to explain the most essential physics concepts of day-to-day life. Lou Bloomfield takes seemingly highly complex devices and strips away the complexity to show how at their heart are simple physics ideas. Once these concepts are understood, they can be used to understand the behavior of many devices encountered in everyday life. The sixth edition uses the power of WileyPLUS Learning Space with Orion to give students the opportunity to actively practice the physics concepts presented in this edition. This text is an unbound, three hole punched version. Access to WileyPLUS sold separately.
Download or read book Phase Separation in Glass written by Oleg V. Mazurin and published by Elsevier. This book was released on 1984-01-01 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phase Separation in Glass
Download or read book Forest Fire Research written by Universidade de Coimbra and published by . This book was released on 2010 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt:
