Download or read book Application de la s paration de sources au traitement de la r ponse d un capteur courants de Foucault written by Yannick Naudet and published by . This book was released on 2001 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES TRAVAUX PRESENTES DANS CE MEMOIRE CONCERNENT UNE ETUDE SUR LES POSSIBILITES D'APPLICATION D'UNE TECHNIQUE AVANCEE DE TRAITEMENT DU SIGNAL, LA SEPARATION DE SOURCES, AU TRAITEMENT DE LA REPONSE D'UN CAPTEUR DE PROXIMITE A COURANTS DE FOUCAULT. L'OBJECTIF EST DE FOURNIR UNE SOLUTION MAJORITAIREMENT LOGICIELLE POUR COMPENSER L'INFLUENCE DE LA TEMPERATURE DE LA CIBLE SUR UNE MESURE DE DISTANCE PRISE PAR UN TEL CAPTEUR. AFIN DE PERMETTRE L'UTILISATION DE TECHNIQUES DE SEPARATION, UN CAPTEUR MULTI-FREQUENCES UTILISANT UNE BOBINE PLATE A ETE CONCU. NOUS DEVELOPPONS TOUT D'ABORD UNE EXPRESSION THEORIQUE DE LA REPONSE EN FREQUENCE DU CAPTEUR, EN ETUDIANT LA PRISE EN COMPTE DE LA GEOMETRIE DE LA BOBINE, AINSI QUE DES EFFETS DE PEAU ET DE PROXIMITE. ENSUITE, PAR UNE ETUDE DE L'INFLUENCE DE LA TEMPERATURE SUR LA REPONSE, NOUS MONTRONS LA COMPLEXITE DU PROBLEME ET LES DIFFICULTES QUE POSERAIT LA RECHERCHE D'UNE SOLUTION ANALYTIQUE POUR EXTRAIRE A LA FOIS LA DISTANCE ET LA TEMPERATURE. APRES UN BREF ETAT DE L'ART SUR LA SEPARATION DE SOURCES, NOUS DEVELOPPONS DEUX APPROCHES SUSCEPTIBLES DE FOURNIR UNE ESTIMATION CORRECTE DE LA DISTANCE CAPTEUR-CIBLE. NOUS APPLIQUONS D'ABORD UN TRAITEMENT GLOBAL SUR TOUTE L'ETENDUE DE MESURE DU CAPTEUR, POUR LEQUEL IL EST NECESSAIRE D'EFFECTUER UNE ETAPE VISANT A LINEARISER LE MELANGE DE DISTANCE ET DE TEMPERATURE ISSU DE LA REPONSE NON-LINEAIRE. AFIN D'AMELIORER LES RESULTATS OBTENUS AVEC UNE SEPARATION AVEUGLE LINEAIRE CLASSIQUE, NOUS PROPOSONS UNE APPROCHE NON-AVEUGLE AINSI QU'UNE AUTRE EXPLOITANT UN EFFET DE RESONANCE STOCHASTIQUE APERIODIQUE. NOUS PROPOSONS ENSUITE UNE SEPARATION LOCALE AUTOUR D'UN POINT DE FONCTIONNEMENT, QUI PERMET DE TRAITER DIRECTEMENT LA REPONSE EN FREQUENCE. FINALEMENT, CETTE TECHNIQUE PERMETTRA D'OBTENIR UNE PRECISION SUFFISANTE POUR L'ESTIMATION DE LA DISTANCE, MALGRE LA PRESENCE D'UN MELANGE LINEAIRE-QUADRATIQUE QUE NOUS METTONS EN EVIDENCE.
Download or read book Application de la s paration de sources au traitement de la r ponse d un capteur courants de Foucault written by Yannick Naudet and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book S paration de sources appliqu e aux communications sous marines written by Sandrine Bonnifay and published by . This book was released on 2001 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: La séparation de sources consiste à retrouver n signaux sources à partir des signaux observés sur un réseau de p capteurs. L'application de la séparation de sources dans un contexte expérimental est un problème délicat, particulièrement dans le domaine des communications sous-marines. Dans la configuration deux sources et deux capteurs, le système de mélange est modélisé par une matrice (2, 2) de filtres RIF à coefficients complexes. La séparation est réalisée en inversant le système de mélange. Sous l'hypothèse d'indépendance statistique des signaux sources, le critère à satisfaire est l'independance des signaux obtenus en sortie du système de séparation. L'hypothèse de système à phase minimale étant difficilement vérifiable expérimentalement, nous n'avons retenu que les méthodes faisant abstraction de cette hypothèse. Le système de séparation est estimé sous la forme d'une matrice (2,2) de filtres RIF. Le canal sous-marin est caractérisé par un filtre RIF composé d'une série de coefficients nuls suivie d'une série de pics associés à chaque arrivée de l'onde sur le capteur. La modélisation du mélange dans ce canal nous a permis de mettre en évidence deux types de transmission : la propagation horizontale/verticale et la propagation horizontale/horizontale. Dans le premier cas, les ordres des filtres diagonaux du système de mélange sont très différents de ceux des filtres anti-diagonaux. En raison de la non stationnarité du canal sous-marin, le nombre d'échantillons disponibles des observations est faible, par conséquent le nombre de paramètres à adapter doit être minimisé. On propose dans ce cas d'adopter un modèle de mélange simplifié dont les éléments diagonaux sont des scalaires. Les performances des algorithmes de séparation de sources sont liées au choix des ordres des filtres de séparation. Ces derniers étant similaires aux filtres de mélange, nous proposons d'estimer les ordres, ainsi que le nombre de paramètres à adapter, par une mesure des maxima de la fonction d'intercorrélation des observations. En revanche, pour une transmission horizontale/horizontale, on considère l'approche par déconvolution multicanaux du modèle de mélange constitué de quatre filtres RIF. Les filtres solutions sont alors des filtres RII qui sont estimés par des filtres RIF. Les ordres des filtres sont estimés à partir de la mesure des maxima des fonctions d'autocorrélation des signaux observés. Ces méthodes sont validées sur des mélanges synthétiques de signaux de communication. Dans le cadre d'une application en aveugle, les fonctions d'intercorrélation des observations permettent de distinguer ces deux types de transmission, et par conséquent de définir l'approche à utiliser. Les mélanges de signaux filtrés expérimentalement nous ont permis d'identifier différents problèmes liés à la non stationnarité du canal sous-marin, pour lesquels nous proposons quelques solutions à venir.
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Download or read book Buyology written by Martin Lindstrom and published by Currency. This book was released on 2010-02-02 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: NEW YORK TIMES BESTSELLER • “A fascinating look at how consumers perceive logos, ads, commercials, brands, and products.”—Time How much do we know about why we buy? What truly influences our decisions in today’s message-cluttered world? In Buyology, Martin Lindstrom presents the astonishing findings from his groundbreaking three-year, seven-million-dollar neuromarketing study—a cutting-edge experiment that peered inside the brains of 2,000 volunteers from all around the world as they encountered various ads, logos, commercials, brands, and products. His startling results shatter much of what we have long believed about what captures our interest—and drives us to buy. Among the questions he explores: • Does sex actually sell? • Does subliminal advertising still surround us? • Can “cool” brands trigger our mating instincts? • Can our other senses—smell, touch, and sound—be aroused when we see a product? Buyology is a fascinating and shocking journey into the mind of today's consumer that will captivate anyone who's been seduced—or turned off—by marketers' relentless attempts to win our loyalty, our money, and our minds.
Download or read book Power Reactor Technology written by and published by . This book was released on 1957 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Max Weber and Karl Marx written by Karl Lowith and published by Routledge. This book was released on 2002-11-01 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: First Published in 2004. Lowith's study of Max Weber and Karl Marx is a key text in modem interpretations of the theme of alienation in Marxist theory and rationalisation in Weber's sociology. It remains the best short student introduction to the differences and comparisons between these essential thinkers. This new edition includes a Preface by Professor Bryan S. Turner which demonstrates the relevance of the book for contemporary sociology.
Download or read book Commercial Nuclear Power written by and published by . This book was released on 1984 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Test and Diagnosis of Analogue Mixed signal and RF Integrated Circuits written by Yichuang Sun and published by IET. This book was released on 2008-05-30 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive discussion of automatic testing, diagnosis and tuning of analogue, mixed-signal and RF integrated circuits, and systems in a single source. As well as fundamental concepts and techniques, the book reports systematically the state of the arts and future research directions of those areas. A complete range of circuit components are covered and test issues from the SoC perspective. An essential reference for researchers and engineers in mixed signal testing, postgraduate and senior undergraduate students.
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 Industrial Districts written by Giacomo Becattini and published by Edward Elgar Publishing. This book was released on 2004-01-01 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book outlines the historical framework and the main concepts of the literature on industrial districts. It illustrates a new approach to the study of industrial development, based on well-known industrial districts analysis. Academics, politicians and students interested in local development and also industrial development will find much to learn in Industrial Districts, as will industrial geographers and historians of industry and of economic thought.
Download or read book From Industrial Districts to Local Development written by Giacomo Becattini and published by Edward Elgar Publishing. This book was released on 2003 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: From Industrial Districts to Local Development introduces a set of papers representing the main contribution of the 'Florence school' to the recent literature on industrial districts. The authors illustrate that the revitalisation of the concept of industrial districts, returning to Alfred Marshall's nineteenth-century writings, is rooted in an unconventional interpretation of the economic development of Tuscany after the Second World War. Models of industrial organisation and empirical investigation of industrial tendencies are featured, and Alfred Marshall's concepts of the advantages of the geographical agglomeration of specialised small firms in industrial districts are reintroduced. The authors extend the analysis of purely economic effects of agglomeration, including social, cultural and institutional foundations of local development, and current case studies are presented. This book will appeal to scholars, lecturers and researchers focusing on industrial economics, development economics and economic geography. Its references to Italian political experiences will also be of interest to policymakers in both developed and developing countries.
Download or read book Economics of Industrial Ecology written by Jeroen C. J. M. van den Bergh and published by MIT Press. This book was released on 2004 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies that integrate scientific, technological, and economic dimensions of industrial ecology and material flows. The use of economic modeling techniques in industrial ecology research provides distinct advantages over the customary approach, which focuses on the physical description of material flows. The thirteen chapters of Economics of Industrial Ecology integrate the natural science and technological dimensions of industrial ecology with a rigorous economic approach and by doing so contribute to the advancement of this emerging field. Using a variety of modeling techniques (including econometric, partial and general equilibrium, and input-output models) and applying them to a wide range of materials, economic sectors, and countries, these studies analyze the driving forces behind material flows and structural changes in order to offer guidance for economically and socially feasible policy solutions. After a survey of concepts and relevant research that provides a useful background for the chapters that follow, the book presents historical analyses of structural change from statistical and decomposition approaches; a range of models that predict structural change on the national and regional scale under different policy scenarios; two models that can be used to analyze waste management and recycling operations; and, adopting the perspective of local scale, an analysis of the dynamics of eco-industrial parks in Denmark and the Netherlands. The book concludes with a discussion of the policy implications of an economic approach to industrial ecology.
Download or read book Principles of Radar and Sonar Signal Processing written by Chevalier François Le and published by Artech House. This book was released on 2002 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computers and the Environment Understanding and Managing their Impacts written by R. Kuehr and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Personal computers have made life convenient in many ways, but what about their impacts on the environment due to production, use and disposal? Manufacturing computers requires prodigious quantities of fossil fuels, toxic chemicals and water. Rapid improvements in performance mean we often buy a new machine every 1-3 years, which adds up to mountains of waste computers. How should societies respond to manage these environmental impacts? This volume addresses the environmental impacts and management of computers through a set of analyses on issues ranging from environmental assessment, technologies for recycling, consumer behaviour, strategies of computer manufacturing firms, and government policies. One conclusion is that extending the lifespan of computers (e.g. through reselling) is an environmentally and economically effective strategy that deserves more attention from governments, firms and the general public.
Download or read book A New Astronomy written by David Peck Todd and published by . This book was released on 1906 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Special Welding Techniques written by and published by . This book was released on 1955 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
