Author: Abdelhadi Besri
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Avec un encombrement minimal et rendement de 99% les transformateurs planars haute fréquence sont des solutions technologiques importantes pour les systèmes de conversion et de conditionnement de l'énergie électrique en électronique de puissance. L'objectif de l'étude consiste à rechercher un modèle du composant permettant à la fois de simuler son comportement dans un circuit d'électronique de puissance et d'optimiser ses performances lors de sa conception. Les modèles proposés prennent en compte les propriétés physiques et géométriques du composant. Les validations sont basées sur des confrontations avec les mesures. Une autre motivation forte de ce travail est que les modélisations numériques doivent prendre en compte simultanément les effets des courants induits et les capacités parasites, ce qui conduit, en haute fréquence, à des besoins prohibitifs en termes de capacité mémoire ou de temps de calcul. En se limitant aux transformateurs planar. La modélisation (dite LEEC) présentée ici s'appuie sur une discrétisation à échelle intermédiaire : spire par spire, c'est-à-dire couche par couche. Elle assemble deux approches analytiques déjà introduites par l'équipe : la première traite les aspects électrocinétiques (incluant les courants induits) et magnétiques et l'autre les aspects électrostatiques. Les circuits à constantes localisées basés sur la méthode LEEC montrent un très bon accord avec toutes les mesures jusqu'à 40 MHz. Des outils numériques sont aussi développés pour faciliter l'obtention de ces différents circuits en partant : soit de la description du composant, soit de mesures d'impédances. Pour compléter, la représentation des capacités d'un transformateur quelconque, développée en plusieurs étapes par l'équipe, est résumée et des précautions expérimentales originales appliquées à l'impédancemétrie sont exposées dans le détail. D'autres travaux visant à élargir le champ d'application de la méthode LEEC sont également présentés.
Author: Agnes Buka
Publisher: World Scientific
ISBN: 1848167997
Category : Science
Languages : en
Pages : 299
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Book Description
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.
Author: Jerome V. Moloney
Publisher: Springer Science & Business Media
ISBN: 9780387985817
Category : Business & Economics
Languages : en
Pages : 270
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Book Description
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.
Author: Lhassane Idoumghar
Publisher: Springer Nature
ISBN: 303045715X
Category : Computers
Languages : en
Pages : 233
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Book Description
This book constitutes the thoroughly refereed post-conference proceedings of the 14th International Conference on Artificial Evolution, EA 2019, held in Mulhouse, France, in October 2019. The 16 revised papers were carefully reviewed and selected from 33 submissions. The papers cover a wide range of topics in the field of artificial evolution, such as evolutionary computation, evolutionary optimization, co-evolution, artificial life, population dynamics, theory, algorithmic and modeling, implementations, application of evolutionary paradigms to the real world (industry, biosciences...), other biologically-inspired paradigms (swarm, artificial ants, artificial immune systems, cultural algorithms...), memetic algorithms, multi-objective optimization, constraint handling, parallel algorithms, dynamic optimization, machine learning and hybridization with other soft computing techniques.
Author: International Association of Science and Technology for Development
Publisher: Anaheim, Calif. ; Calgary : Acta Press
ISBN:
Category : Mathematics
Languages : en
Pages : 310
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Book Description
Author: Bernabé Dorronsoro
Publisher: Springer Nature
ISBN: 3030942163
Category : Computers
Languages : en
Pages : 230
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Book Description
This volume constitutes selected papers presented during the 8th International Conference on Metaheuristics and Nature Inspired Computing, META 2021, held in Marrakech, Morocco, in October 201. Due to the COVID-19 pandemic the conference was partiqally held online. The 16 papers were thoroughly reviewed and selected from the 53 submissions. They are organized in the topical sections on combinatorial optimization; continuous optimization; optimization and machine learning; applications.
Author: Suresh Manandhar
Publisher:
ISBN: 9783662179352
Category :
Languages : en
Pages : 352
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Book Description
Author: M. H. Hamza
Publisher:
ISBN:
Category : Artificial intelligence
Languages : en
Pages : 424
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Book Description
Author: Witold Pedrycz
Publisher: World Scientific
ISBN: 9789810235031
Category : Computers
Languages : en
Pages : 504
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Book Description
This unique volume is the first publication on software engineering and computational intelligence (CI) viewed as a synergistic interplay of neurocomputing, granular computation (including fuzzy sets and rough sets), and evolutionary methods. It presents a unified view of CI in the context of software engineering. The book addresses a number of crucial issues: what is CI, what role does it play in software development, how are CI elements built into successive phases of the software life cycle, and what is the role played by CI in quantifying fundamental features of software artifacts? With contributions from leading researchers and practitioners, the book provides the reader with a wealth of new concepts and approaches, complete algorithms, in-depth case studies, and thought-provoking exercises. The topics coverage include neurocomputing, granular as well as evolutionary computing, object-oriented analysis and design in software engineering. There is also an extensive bibliography.
