Download or read book M thodes num riques innovantes pour la simulation thermique de composants lectroniques written by Gaël Bonithon and published by Omniscriptum. This book was released on 2011-07 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Un des enjeux actuels en lectronique est de mesurer l'impact de ph nom nes tr s localis s, comme des commutations ou des courts-circuits, sur la thermique globale d'un composant. Il s'agit alors de coupler diff rentes chelles espace-temps, en assurant en particulier des changements d' chelle sans perte d'information. Dans la premi re partie de ce travail, on propose d'utiliser la m thode des l ments de fronti re transitoire pour r pondre cette probl matique. On combine tout d'abord diff rentes formulations int grales et des techniques d'optimisation pour r duire le co t de la m thode. On r utilise ensuite ce travail pour d velopper une approche multi- chelles, et g n raliser la m thode des l ments de fronti re aux mat riaux non lin aires. Une seconde partie est consacr e au d veloppement d'une m thode alternative, visant r duire les temps de calcul de mani re plus significative tout en conservant une base l ments de fronti re. Il s'agit d'une m thode de d composition propre g n ralis e, qui permet de construire une repr sentation variables s par es de la solution de mani re non incr mentale.
Download or read book CONTRIBUTION A LA MODELISATION NUMERIQUE DES COMPOSANTS ELECTRONIQUES AUX DIMENSIONS NANOMETRIQUES written by SEBASTIEN.. LEPAUL and published by . This book was released on 1996 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE PORTE SUR LA SIMULATION NUMERIQUE DES COMPOSANTS ELECTRONIQUES DE DIMENSIONS NANOMETRIQUES A HETEROSTRUCTURES. L'OBJECTIF DE CE TRAVAIL EST LA MODELISATION PRECISE DE DIFFERENTS PHENOMENES PHYSIQUES INTERVENANT DANS CES DISPOSITIFS: CONFINEMENT DES PORTEURS, TRANSPORT ELECTRONIQUE, AUTO-ECHAUFFEMENT. CETTE MODELISATION EST CONDUITE AVEC LE SOUCI DE RESPECTER LES GEOMETRIES DES DISPOSITIFS REELS. SONT ETUDIEES SUCCESSIVEMENT LES METHODES NUMERIQUES DE RESOLUTION DES EQUATIONS DE SCHRODINGER-POISSON, DES EQUATIONS DE TRANSPORT DANS L'APPROXIMATION DERIVE-DIFFUSION ET DE L'EQUATION DE DISSIPATION DE LA CHALEUR COUPLEE A UN MODELE DE TRANSPORT QUASI-BIDIMENSIONNEL. POUR CHACUNE DE CES EQUATIONS DES ALGORITHMES NUMERIQUES DE RESOLUTION BASES SUR LA METHODE DES ELEMENTS FINIS NODAUX OU MIXTES ONT ETE DEVELOPPES ET COMPARES. LES RESULTATS OBTENUS POUR L'AUTO-ECHAUFFEMENT ONT ETE VALIDE AVEC UNE TRES BONNE PRECISION PAR DES MESURES EFFECTUEES EN ELECTROLUMINESCENCE. SELON LE TYPE D'EQUATION A RESOUDRE, L'UN OU L'AUTRE TYPE D'ELEMENTS PEUT ETRE RETENU. LES ELEMENTS MIXTES SEMBLENT BIEN ADAPTES A LA RESOLUTION DE SCHRODINGER-POISSON ALORS QUE LES ELEMENTS NODAUX PARAISSENT SUFFISANTS POUR LES EQUATIONS DE TRANSPORT OU DE DISSIPATION THERMIQUE. CES DIFFERENTES ETUDES OUVRENT DES PERSPECTIVES ENCOURAGEANTES VERS LA REALISATION DE SIMULATEURS PRENANT EN COMPTE LA PHYSIQUE DE CES COMPOSANTS ELECTRONIQUES
Download or read book Methodes de calcul numerique pour la simulation thermique des circuits integres written by Alain Fourmigue and published by . This book was released on 2014 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contribution l tude du comportement thermique des composants lectroniques written by Sébastien Vintrou and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail traite des aspects thermiques dans les composants électroniques, en particulier ceux de composants qui peuvent être thermiquement assimilés à des sources de chaleur localisées sur des milieux solides diffusifs. Dans une première partie, un modèle analytique général d'impédance thermique est développé. Il permet de calculer les températures de jonction de composants électroniques multidoigts sur des supports multicouches. Le modèle est basé sur la résolution tridimensionnelle de l'équation de la chaleur en régime fréquentiel par la méthode des transformées intégrales. Il a été utilisé pour évaluer l'influence des différents paramètres géométriques et structuraux du problème physique. Sa simplicité et la rapidité des temps de calculs en font un outil parfaitement adapté à la simulation des circuits électroniques.La seconde partie de ce travail est consacrée à la reconstitution spatiotemporelle des sources de chaleur par méthode inverse. Pour atteindre l'objectif, la méthode numérique des volumes finis a été programmée, afin d'exprimer sous la forme d'une représentation d'état, le problème en trois dimensions et en régime transitoire du phénomène de transfert de chaleur par conduction. La densité de flux a été discrétisée dans l'espace et le temps. Elle est estimée par la pseudo-inversion de la représentation d'état. Des tests numériques et un dispositif expérimental ont permis de valider la méthode.
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 Terra 2008 written by Leslie Rainer and published by Getty Publications. This book was released on 2011-06-14 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.
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 Artificial Intelligence in Society written by OECD and published by OECD Publishing. This book was released on 2019-06-11 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The artificial intelligence (AI) landscape has evolved significantly from 1950 when Alan Turing first posed the question of whether machines can think. Today, AI is transforming societies and economies. It promises to generate productivity gains, improve well-being and help address global challenges, such as climate change, resource scarcity and health crises.
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 Lascaux written by Norbert Aujoulat and published by . This book was released on 2005-06-07 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discovered by chance by two boys in France in 1940, the cave of Lascaux, with its radiant wall paintings of bison, aurochs, horses, and deer, offers us the most astonishing view we have of the shadowy, powerful animal world of the Old Stone Age some 18,000 years ago. In the early 1960s, when it became clear that the paintings were beginning to fade as countless tourists flocked to see them, the cave was sealed, ancient atmospheric conditions were restored, and even scientists were allowed to enter the cave only a few hours each week. Today this prehistoric monument remains closed to the public. Following 10 years of research on the Lascaux cave, the prehistorian and geologist Norbert Aujoulat offers us his stunning interpretation of the paintings. In this lavishly illustrated volume, packed with new photographs, maps, and explanatory diagrams of the paintings, he takes us on a journey from the entrance of the cave back to its deepest and most hidden parts. In the process, he provides us with new insight into these remarkable works, tracing the birth of ancient mythologies, and of art.
Download or read book Numerical Methods for Partial Differential Equations written by Sandip Mazumder and published by Academic Press. This book was released on 2015-12-01 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical Methods for Partial Differential Equations: Finite Difference and Finite Volume Methods focuses on two popular deterministic methods for solving partial differential equations (PDEs), namely finite difference and finite volume methods. The solution of PDEs can be very challenging, depending on the type of equation, the number of independent variables, the boundary, and initial conditions, and other factors. These two methods have been traditionally used to solve problems involving fluid flow. For practical reasons, the finite element method, used more often for solving problems in solid mechanics, and covered extensively in various other texts, has been excluded. The book is intended for beginning graduate students and early career professionals, although advanced undergraduate students may find it equally useful. The material is meant to serve as a prerequisite for students who might go on to take additional courses in computational mechanics, computational fluid dynamics, or computational electromagnetics. The notations, language, and technical jargon used in the book can be easily understood by scientists and engineers who may not have had graduate-level applied mathematics or computer science courses. - Presents one of the few available resources that comprehensively describes and demonstrates the finite volume method for unstructured mesh used frequently by practicing code developers in industry - Includes step-by-step algorithms and code snippets in each chapter that enables the reader to make the transition from equations on the page to working codes - Includes 51 worked out examples that comprehensively demonstrate important mathematical steps, algorithms, and coding practices required to numerically solve PDEs, as well as how to interpret the results from both physical and mathematic perspectives
Download or read book Engines and Powertrains written by Ronald K Jurgen and published by SAE International. This book was released on 2010-11-29 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: With production and planning for new electric vehicles gaining momentum worldwide, this book – the third in a series of five volumes on this subject – provides engineers and researchers with perspectives on the most current and innovative developments regarding electric and hybrid-electric vehicle technology, design considerations, and components. This book features 13 SAE technical papers, published from 2008 through 2010, that provide an overview of research on electric vehicle engines and powertrains. Topics include: Hybrid-electric vehicle transmissions and propulsion systems The development of a new 1.8-liter engine for hybrid vehicles Vehicle system control software validation The impact of hybrid-electric powertrains on chassis systems and vehicle dynamics High-torque density motors, and interior permanent magnet synchronous motors
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 The Disappearing Computer written by Norbert Streitz and published by Springer. This book was released on 2007-07-20 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines how the computer, as we currently know it, will be replaced by a new generation of technologies, moving computing off the desktop and ultimately integrating it with real world objects and everyday environments. It provides a unique combination of concepts, methods and prototypes of ubiquitous and pervasive computing reflecting the current interest in smart environments and ambient intelligence.
Download or read book Government at a Glance Southeast Asia 2019 written by OECD and published by OECD Publishing. This book was released on 2019-09-10 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Government at a Glance Southeast Asia 2019 is the first edition in the Government at a Glance series for the region. It provides the latest available data on public administrations in the 10 ASEAN member countries: Brunei Darussalam, Cambodia, Indonesia, Lao People’s Democratic Republic, Malaysia, Myanmar, the Philippines, Singapore, Thailand and Viet Nam.
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.
Download or read book Dew Water written by Daniel Beysens and published by CRC Press. This book was released on 2022-09-01 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world’s ever-increasing need for fresh water has led to the use of non-conventional sources such as rain and fog water collection. Although rain water collection is relatively simple, the supply is often erratic. Passive fog water collection has been used in several parts of the world but is only relevant to certain geographical locations. Dew occurrence, however, is far more widespread, can form in most climates and geographic settings, show high frequency and prevalence throughout the year. During the past 20 years, dew collection has therefore been investigated as a serious supplemental source of fresh water. Dew Water offers a thorough review of dew, its formation characteristics and potential for dew collection, for audiences that include policy-makers, non-governmental organizations involved in development aid and sustainable development, engineers, urban planners, researchers and students.After providing a background on atmospheric water, humid air, and sky and materials emissivity, the book deals with dew formation and its estimation with a focus on the use of meteorological data. Dew measurement techniques are reviewed and discussed as well as dew collection by passive means. Computational fluid dynamics technique is described for better design of dew collectors. Dew quality (chemistry, biology) is assessed in view of potable water quality. Costs and economic aspects are also considered.
