Download or read book CONTRIBUTION A L ETUDE PAR SPECTROSCOPIE DE PHOTOELECTRONS EXCITES PAR RAYONS X DES SURFACES DE SEMI CONDUCTEURS III V written by Driss Agliz and published by . This book was released on 1987 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: CALCUL DES DENSITES D'ETATS; CONFIRMATION DE L'ORIGINE D'UNE BANDE OBSERVEE EXPERIMENTALEMENT, DUE AU DEVELOPPEMENT DU RESEAU COVALENT LE LONG DE LA SERIE DES COMPOSES ETUDIES. L'ETUDE DES NIVEAUX DE COEUR DU COMPOSE DU PHOSPHORE OXYDE PERMET DE CARACTERISER LA STRUCTURE DE L'AZOTE ET CELLE DE L'OXYGENE

Download or read book ETUDE PAR SPECTROSCOPIE DE PHOTOELECTRONS DE SURFACES ET INTERFACES DE SEMI CONDUCTEURS III V PREPAREES PAR EPITAXIE PAR JETS MOLECULAIRES written by MARC.. LARIVE and published by . This book was released on 1993 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: DANS CETTE THESE, NOUS PRESENTONS QUELQUES ETUDES DE CARACTERISATION IN SITU AVEC UNE METHODE D'ANALYSE DE SURFACE (SPECTROSCOPIE DE PHOTOELECTRONS AU LABORATOIRE ET AVEC LE RAYONNEMENT SYNCHROTRON) REALISEES AU COURS DE LA CROISSANCE D'INTERFACES SEMI-CONDUCTEUR/SEMI-CONDUCTEUR OU SEMI-CONDUCTEUR/METAL. TOUT D'ABORD, UNE ETUDE SUR LES SURFACES PROPRES DE GAAS OBTENUES PAR EPITAXIE PAR JETS MOLECULAIRES POUR DIFFERENTES ORIENTATIONS ET RECONSTRUCTIONS EST EFFECTUEE. LES COMPOSANTES DE SURFACE SONT MISES EN EVIDENCE SUR LES SPECTRES DE NIVEAUX DE COEUR ET, A PARTIR D'UN MODELE SIMPLE DE REPARTITION DE CHARGES ELECTRONIQUES, RELIEES AUX DIFFERENTES RECONSTRUCTIONS ATOMIQUES DE SURFACE. NOUS PRESENTONS ENSUITE UNE ETUDE SUR LES INTERFACES NI/GAAS (100) REALISEES IN SITU. LA METALLURGIE SEMBLE LA MEME QUE POUR NI/GAAS (110) ET L'ANALYSE DES SPECTRES DE BANDE DE VALENCE ET DE NIVEAUX DE COEUR MONTRE QUE LA STOECHIOMETRIE DU COMPOSE DE REACTION VARIE AU COURS D'UN RECUIT. LA HAUTEUR DE LA BARRIERE DE SCHOTTKY FORMEE EST LA MEME SUR LES DEUX ORIENTATIONS (0,54 EV POUR UN SUBSTRAT DE TYPE P EN ACCORD AVEC LES PREDICTIONS BASEES SUR LA DIFFERENCE D'ELECTRONEGATIVITE). ENFIN, L'ANALYSE IN-SITU PAR SPECTROSCOPIE DES NIVEAUX DE COEUR GA-3D ET IN-4D, ASSOCIEE A UN MODELE D'EQUILIBRE LOCAL EN SURFACE, A PERMIS DE QUANTIFIER LE PHENOMENE DE SEGREGATION D'INDIUM AUX INTERFACE GA#1#-#XIN#XAS/GAAS (100) ET (111). UNE ENERGIE DE SEGREGATION PHENOMENOLOGIQUE PEUT ETRE DETERMINEE EXPERIMENTALEMENT A PARTIR DE NOS MESURES ET UTILISEE POUR LA PREDICTION DES PROPRIETES OPTIQUES DE PUITS QUANTIQUES GAAS/GAINAS/GAAS (100). L'INFLUENCE DE LA DIFFUSION DES ATOMES EN SURFACE COMME FACTEUR LIMITANT CINETIQUEMENT L'IMPORTANCE DE LA SEGREGATION EST DEMONTREE. ENFIN, NOUS AVONS AUSSI ETUDIE LA DISCONTINUITE DE BANDE DE VALENCE ASSOCIEE A CES HETEROJONCTIONS

Download or read book Pandex Current Index to Scientific and Technical Literature written by and published by . This book was released on 1971 with total page 1334 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamics of Multi photon Processes in Semiconductor Heterostructures written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: La présente thèse est dédiée à l'étude de la dynamique des processus à plusieurs photons dans les hétérostructures à semi-conducteurs. Une description de la dépendance temporelle est importante pour une compréhension détaillée de la réponse transitoire de semi-conducteurs excités par des impulsions optiques ultracourtes. Dans la première partie de la thèse, nous développons un modèle phénoménologique basé sur un ensemble d'équations de bilan, afin d'étudier le gain à deux photons dégénérés dans une microcavité à semi-conducteurs. L'amplification prédite par le modèle est relativement faible (~2%) et limitée principalement par la relaxation intra-bande des porteurs, qui débouche sur une saturation rapide. Dans la seconde partie, nous développons une théorie générale pour la dynamique des processus à plusieurs photons dans les semi-conducteurs. Elle permettra d'accéder à des effets complexes, liés à la cohérence entre les bandes, qui ne sont pas inclus dans les habituels coefficients d'absorption ou susceptibilités. Dans ce contexte, nous dérivons un ensemble d'équations de Bloch effectives à plusieurs bandes, incluant des processus résonants à plusieurs photons induits par deux impulsions électromagnétiques linéairement polarisées, de fréquence ω1 et ω2, avec ħω1 et 2ħω2 proches de l'énergie de la bande interdite (ou "gap"). L'approche proposée présente essentiellement deux avantages. Premièrement, la description de la dynamique est restreinte à un nombre limité de bandes. Toutefois, les bandes éliminées ne sont pas négligées, mais includes de manière consistante dans les processus d'ordre supérieur. Deuxièmement, toutes les quantités apparaissant dans les équations de Bloch effectives varient sur la même échelle de temps, ce qui permet une intégration numérique beaucoup plus efficace. Le courant de polarisation dépendant du temps, ainsi que certaines susceptibilités, sont dérivés de manière consistante avec les approximations précédentes, et sont discut.

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 Basic Concepts for Simple and Complex Liquids written by Jean-Louis Barrat and published by Cambridge University Press. This book was released on 2003-03-27 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting a unified approach, this book focusses on the concepts and theoretical methods that are necessary for an understanding of the physics and chemistry of the fluid state. The authors do not attempt to cover the whole field in an encyclopedic manner. Instead, important ideas are presented in a concise and rigorous style, and illustrated with examples from both simple molecular liquids and more complex soft condensed matter systems such as polymers, colloids, and liquid crystals.

Download or read book On the Continuity of the Gaseous and Liquid States written by J. D. Van Der Waals and published by Courier Corporation. This book was released on 2004-01-01 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This much-cited thesis by J. D. van der Waals, the recipient of the 1910 Nobel Prize in physics, is accompanied by an introductory essay by J. S. Rowlinson and another work by van der Waals on the theory of liquid mixtures. 1988 edition.

Download or read book Organic Solid State Lasers written by Sébastien Forget and published by Springer. This book was released on 2013-07-03 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.

Download or read book UCRL written by U.S. Atomic Energy Commission and published by . This book was released on 19?? with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Solid State Dosimetry written by Klaus Becker and published by . This book was released on 1973 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Modern Surface Organometallic Chemistry written by Jean-Marie Basset and published by John Wiley & Sons. This book was released on 2009-07-10 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering everything from the basics to recent applications, this monograph represents an advanced overview of the field. Edited by internationally acclaimed experts respected throughout the community, the book is clearly divided into sections on fundamental and applied surface organometallic chemistry. Backed by numerous examples from the recent literature, this is a key reference for all chemists.

Download or read book Laser 50 Years Of Discoveries written by Fabien Bretenaker and published by World Scientific. This book was released on 2014-10-27 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique book provides an overview of the principle and applications of lasers enriched with numerous illustrations.Being over fifty years old, lasers continue to amaze us. Their performance characteristics are constantly reaching new limits, and the scope of their applications continues to expand. Yet, it took years of effort by teams of physicists to transform the fundamental notions of Einstein into the first experimental beam of laser light. And history is still going on as fundamental research is now triggered by its remarkable properties.This book addresses every aspects of laser light, from its fundamental principles to its industrial applications, at a level particularly suited for high school teachers, students, and anybody curious about science and technology.

Download or read book Microdosimetry written by Lennart Lindborg and published by CRC Press. This book was released on 2020-10-02 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental microdosimetry deals with the measurement of charged particle energy deposition in tissue equivalent volumes, ranging in size from nanometres to micrometres. Microdosimetry is employed to improve our understanding of the relationship between radiation energy deposition, the resulting biological effects, and the appropriate quantities to be used in characterizing and quantifying radiation quality. Although many reviews and contributions to the field have been published over the past fifty years, this new book is the first to provide a single, up to date, and easily accessible account of experimental microdosimetry. This book is designed to be used in medical, radiation, and health physics courses and by Master's and PhD students. In addition to serving as an introductory text to the field for graduate students, this book will also be of interest as a teaching and reference resource for graduate supervisors and established researchers. Drs. Lennart Lindborg and Anthony Waker have spent a life-time career in experimental microdosimetry research in academic, industrial and regulatory environments and have observed the development of the field from its early days as a recognized discipline; they bring to this book particular knowledge and experience in the design, construction, operation and use of tissue equivalent gas ionization counters and chambers.

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 Prussian Blue type Nanoparticles and Nanocomposites written by Yannick Guari and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanochemistry tools aid the design of Prussian blue and its analogue nanoparticles and nanocomposites. The use of such nanomaterials is now widely regarded as an alternative to other inorganic nanomaterials in a variety of scientific applications. This book, after addressing Prussian blue and its analogues in a historical context and their numerous applications over time, compiles and details the latest cutting-edge scientific research on these nanomaterials. It compiles and deatils the latest cutting-edge scientific research on these nanomaterials. The book provides an overview of the methodological concepts of the nanoscale synthesis of Prussian blue and its analogues, as well as the study and understanding of their properties and of the extent and diversity of application fields in relation to the major societal challenges of the 21st century on energy, environment, and health.