Download or read book CONTRIBUTION A L ETUDE DE L INFLUENCE DES PHENOMENES D AUTO ABSORPTION SUR LA RECOMBINAISON DES PORTEURS DANS LES SEMICONDUCTEURS written by BACHIR.. BENSAID and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: DANS LES SEMICONDUCTEURS A LARGEUR DE BANDE INTERDITE DIRECTE, LES PROCESSUS DE REABSORPTION DU PHOTON EMIS, SONT CONNUS POUR LEUR CONTRIBUTION A L'AUGMENTATION DE LA DUREE DE VIE ET DE LA DIFFUSION DES PORTEURS MINORITAIRES DANS LE CAS D'UNE CELLULE SOLAIRE PUISQU'ILS CONTROLENT LE RENDEMENT PHOTOVOLTAIQUE. LA REABSORPTION EST LIEE A LA STRUCTURE DE BANDE DU SEMICONDUCTEUR DE BASE UTILISE DANS LA FABRICATION DE PHOTOPILES. LA MESURE DU DECLIN DE PHOTOLUMINESCENCE EST UN DES MOYENS QUI PERMET D'EVALUER LA DUREE DE VIE DES PORTEURS MINORITAIRES. IL EN RESULTE QU'UNE BONNE MODELISATION DU DECLIN DE CETTE PHOTOLUMINESCENCE EST NECESSAIRE POUR EVALUER DE FACON PRECISE LA DUREE DE VIE ET LES PARAMETRES DE TRANSPORT. AINSI, NOUS NOUS SOMMES INTERESSES A UNE ETUDE THEORIQUE DETAILLEE DES MECANISMES RELIES A LA STRUCTURE DE BANDE DE CES MATERIAUX ET POUVANT INFLUENCER LA DECROISSANCE DE LUMINESCENCE, EN PARTICULIER LA REABSORPTION QUI JUSQU'ICI N'A PAS BIEN ETE PRISE EN COMPTE DANS TOUTES LES CONFIGURATIONS EXPERIMENTALES. NOUS AVONS RESOLU LE PROBLEME POUR LES DEUX CAS PRATIQUE D'INJECTION: LE CAS LINEAIRE, LIE AUX FAIBLES NIVEAUX D'INJECTION ET LE CAS NON LINEAIRE, LIE AUX FORTES INJECTIONS. CE MODELE DYNAMIQUE TIENT COMPTE DES CONDITIONS EXPERIMENTALES NOTAMMENT DES CARACTERISTIQUES GEOMETRIQUES ET OPTIQUES DE L'ECHANTILLON AINSI QUE DES CARACTERISTIQUES TEMPORELLES DE L'EXCITATION. LES RESULTATS AINSI OBTENUS ONT MONTRE QUE NOTRE MODELE AMELIORE L'ANALYSE DES DONNEES EXPERIMENTALES FOURNIES PAR LA CARACTERISATION. L'AJUSTEMENT GLOBAL ENTRE LES EXPERIENCES ET LE CALCUL PERMET DE DETERMINER LES PARAMETRES DE TRANSPORT TELS LE COEFFICIENT DE DIFFUSION, LES VITESSES DE RECOMBINAISON INTERFACIALES AUSSI BIEN QUE LA DUREE DE VIE NON-RADIATIVE DES PORTEURS MINORITAIRES, ET CE BIEN QUE L'EXPERIENCE SOIT PUREMENT OPTIQUE

Download or read book ETUDE DE LA DYNAMIQUE DES PORTEURS DANS LES SEMI CONDUCTEURS 3 5 SOUS EXCITATIONS OPTIQUES written by Jimmy Dubard and published by . This book was released on 1986 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE DES COUCHES EPITSAXIQUES GAAS ET DES MULTI-PUITS QUANTIQUES GAAS-ALGAAS PAR SATURATION DE L'ABSORPTION. EFFET DE LA TEMPERATURE EMISE PAR LA TRANCHE DE L'ECHANTILLON EXCITE PRES D'UN BORD. INTERPRETATION DE L'EMISSION DE PHOTONS SE PROPAGEANT DANS LE PLAN DES COUCHES OU LA LONGUEUR D'INTERACTION EST LA PLUS IMPORTANTE

Download or read book CONTRIBUTION A L ETUDE DES SEMICONDUCTEURS PAR PHOTOEMISSION A DEUX PROTONS written by JEAN-MARIE.. MOISON and published by . This book was released on 1985 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: APPLICATION DE LA METHODE POUR L'ETUDE DE LA BANDE DE CONDUCTION ET LA DYNAMIQUE DES ELECTRONS DANS LES ETATS VIDES

Download or read book Contribution l tude de l influence de la polarisation du champ lectromagn tique sur les ph nom nes d absorption multiphotoniques written by Michel Jaouen (Jean-Yves) and published by . This book was released on 1973 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ETUDE DU PHENOMENE D IONISATION PAR CHOC DANS LES SEMI CONDUCTEURS III V written by NICOLAS.. CAVASSILAS and published by . This book was released on 2000 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: DANS CETTE THESE NOUS PRESENTONS UNE ETUDE DU PHENOMENE D'IONISATION PAR CHOC DANS LES SEMI-CONDUCTEURS. NOUS AVONS ECRIT UN PROGRAMME DE RESOLUTION DETERMINISTE DE L'EQUATION DE TRANSPORT DE BOLTZMANN QUI NOUS A PERMIS DE CALCULER LES COEFFICIENTS D'IONISATION DANS DES MATERIAUX MASSIF. CE PROGRAMME ORIGINAL, PERMET D'OBTENIR DIRECTEMENT LA SOLUTION A L'ETAT STATIONNAIRE SANS FAIRE D'HYPOTHESE SUR UNE EVENTUELLE CONDITION INITIALE. AFIN D'APPLIQUER CE PROGRAMME AU TRANSPORT A FORT CHAMP (500 KV/CM) QUI IMPLIQUE LA PRISE EN COMPTE DES ELECTRONS A HAUTES ENERGIE (3,5 EV), NOUS AVONS CALCULE LES STRUCTURES DE BANDES DES SEMI-CONDUCTEURS A L'AIDE DE LA THEORIE K.P AVEC UN MODELE SP 3S*D. CE MODELE QUI N'AVAIT JAMAIS ETE UTILISE EN THEORIE K.P DONNE DE TRES BONS RESULTATS POUR LES QUATRES PREMIERES BANDES DE CONDUCTIONS SUR TOUTE LA ZONE DE BRILLOUIN JUSQU'A DES ENERGIES DE 4 EV AU-DESSUS DU BAS DE LA BANDE DE CONDUCTION. LE PROGRAMME DE RESOLUTION DE L'EQUATION DE BOLTZMANN A EGALEMENT ETE APPLIQUE A UNE ETUDE DE LA RECOMBINAISON RADIATIVE DANS UN SEMI-CONDUCTEUR PLACE DANS UN CHAMP ELECTRIQUE (

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 Optical Properties Of Graphene written by Rolf Binder and published by World Scientific. This book was released on 2016-11-11 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive state-of-the-art overview of the optical properties of graphene. During the past decade, graphene, the most ideal and thinnest of all two-dimensional materials, has become one of the most widely studied materials. Its unique properties hold great promise to revolutionize many electronic, optical and opto-electronic devices. The book contains an introductory tutorial and 13 chapters written by experts in areas ranging from fundamental quantum mechanical properties to opto-electronic device applications of graphene.

Download or read book Color Television Receivers written by and published by . This book was released on 1978 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report to the President on investigation no. 332-95 under section 332 of the Tariff Act of 1930, as amended.

Download or read book TOF Range Imaging Cameras written by Fabio Remondino and published by Springer Science & Business Media. This book was released on 2013-04-09 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today the cost of solid-state two-dimensional imagers has dramatically dropped, introducing low cost systems on the market suitable for a variety of applications, including both industrial and consumer products. However, these systems can capture only a two-dimensional projection (2D), or intensity map, of the scene under observation, losing a variable of paramount importance, i.e., the arrival time of the impinging photons. Time-Of-Flight (TOF) Range-Imaging (TOF) is an emerging sensor technology able to deliver, at the same time, depth and intensity maps of the scene under observation. Featuring different sensor resolutions, RIM cameras serve a wide community with a lot of applications like monitoring, architecture, life sciences, robotics, etc. This book will bring together experts from the sensor and metrology side in order to collect the state-of-art researchers in these fields working with RIM cameras. All the aspects in the acquisition and processing chain will be addressed, from recent updates concerning the photo-detectors, to the analysis of the calibration techniques, giving also a perspective onto new applications domains.

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 Light Water Hydrogen written by CRAIG GRIMES and published by Springer Science & Business Media. This book was released on 2007-12-03 with total page 561 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the field of solar production of hydrogen by water photo-splitting (photoelectrolysis) using semiconductor photoanodes. The emphasis of the discussion is on the use of nanotechnology in the field. The theories behind photocatalysis and photoelectrochemical processes responsible for hydrogen production are given in detail. This provides a state-of-the-art review of the semiconductor materials and methods used for improving the efficiency of the processes. The book also gives an account of the techniques used for making the nanostructures.

Download or read book The Kyoto Protocol written by Sebastian Oberthür and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: The adoption of the Kyoto Protocol in December 1997 was a major achievement in the endeavour to tackle the problem of global climate change at the dawn of the 21st century. After many years of involvement in the negotiation process, the book's two internationally recognised authors now offer the international community a first hand and inside perspective of the debate on the Kyoto Protocol. The book provides a comprehensive scholarly analysis of the history and content of the Protocol itself as well as of the economic, political and legal implications of its implementation. It also presents a perspective for the further development of the climate regime. These important features make this book an indispensable working tool for policy makers, negotiators, academics and all those actively involved and interested in climate change issues in both the developed and developing world.

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 Advances in Photodiodes written by Gian-Franco Dalla Betta and published by BoD – Books on Demand. This book was released on 2011-03-22 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photodiodes, the simplest but most versatile optoelectronic devices, are currently used in a variety of applications, including vision systems, optical interconnects, optical storage systems, photometry, particle physics, medical imaging, etc. Advances in Photodiodes addresses the state-of-the-art, latest developments and new trends in the field, covering theoretical aspects, design and simulation issues, processing techniques, experimental results, and applications. Written by internationally renowned experts, with contributions from universities, research institutes and industries, the book is a valuable reference tool for students, scientists, engineers, and researchers.

Download or read book Single Photon Generation and Detection written by and published by Academic Press. This book was released on 2013-11-29 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-photon generation and detection is at the forefront of modern optical physics research. This book is intended to provide a comprehensive overview of the current status of single-photon techniques and research methods in the spectral region from the visible to the infrared. The use of single photons, produced on demand with well-defined quantum properties, offers an unprecedented set of capabilities that are central to the new area of quantum information and are of revolutionary importance in areas that range from the traditional, such as high sensitivity detection for astronomy, remote sensing, and medical diagnostics, to the exotic, such as secretive surveillance and very long communication links for data transmission on interplanetary missions. The goal of this volume is to provide researchers with a comprehensive overview of the technology and techniques that are available to enable them to better design an experimental plan for its intended purpose. The book will be broken into chapters focused specifically on the development and capabilities of the available detectors and sources to allow a comparative understanding to be developed by the reader along with and idea of how the field is progressing and what can be expected in the near future. Along with this technology, we will include chapters devoted to the applications of this technology, which is in fact much of the driver for its development. This is set to become the go-to reference for this field. - Covers all the basic aspects needed to perform single-photon experiments and serves as the first reference to any newcomer who would like to produce an experimental design that incorporates the latest techniques - Provides a comprehensive overview of the current status of single-photon techniques and research methods in the spectral region from the visible to the infrared, thus giving broad background that should enable newcomers to the field to make rapid progress in gaining proficiency - Written by leading experts in the field, among which, the leading Editor is recognized as having laid down the roadmap, thus providing the reader with an authenticated and reliable source

Download or read book Industrial Uses of Large Radiation Sources written by International Atomic Energy Agency and published by . This book was released on 1963 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Confronting Poverty in Iraq written by World Bank and published by World Bank Publications. This book was released on 2011-01-10 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides the most comprehensive and rigorous analysis of Iraqi income and expenditure in several decades. The report makes extensive use of the Iraq Household Socio-Economic Survey, the first nationwide income and expenditure survey since 1988. IHSES data is complemented income and expenditure data from a wide range of other measures of living standards, allowing us to analyze living standards in a holistic way. The analysis presented here was performed with two main goals first, to inform the Government s Poverty Reduction Strategy; and second, to serve as a baseline for future assessments of changes in living standards and the identification of critical issues for deeper examination. Iraqi living standards have two unusual characteristics. First, they have fallen over the past generation. Second, they feature surprisingly little inequality. These characteristics are both rooted in Iraq s recent history of authoritarian government, war, military occupation, insurgency, and civil strife leading to infrastructure destruction and population displacement. There have been few opportunities for individuals to prosper from professional or entrepreneurial activities. Decades of neglected investment have resulted in deterioration of social services and economic infrastructure. Consequently, individuals have lacked capabilities to prosper and an investment climate conducive to prosperity. School enrollment and life expectancy have declined. Extremely low returns to education reflect the combination of poor educational quality and lack of employment opportunities. In terms of economic infrastructure, access to reliable electricity and water, and even access to paved roads are low, are further reflections of decades of neglect. While the upper end of the distribution has been pulled down by a lack of opportunities, the lower end has been supported by direct government provision of food. The Public Distribution System (PDS) provides 85 percent of food needs. While PDS has been useful as a safety net for the poor and the vulnerable, the system is expensive, inefficient, and fiscally risky. Indeed, PDS food rations account for a far greater share of public spending than does education or health. Going forward, Iraq faces two main challenges. First, although Iraq does not have to develop from scratch, it faces a formidable challenge in re-development. Second, a shift by the Government is required from direct provision of basic subsistence toward investment in human capacities. The Government can provide an enabling environment through investments in economic infrastructure and services to business and citizens, thus allowing the population to make productive use of education and their own labor. Both challenges are now being taken up by the Poverty Reduction Strategy, which articulates a detailed set of required actions and outlines priorities for government spending.