Download or read book Propagation d ondes accoustiques et lastiques written by BRAC Jean and published by Lavoisier. This book was released on 2003-01-01 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cet ouvrage propose une méthode de construction de schémas numériques de grande précision sur la base d'une analyse spectrale de l'erreur. Ces schémas sont appliqués à la propagation des ondes mais ils peuvent l'être à la résolution par différences finies de tout autre système d'équations aux dérivées partielles. Plusieurs formulations du problème continu sont exposées mais on retient la formulation en vitesses de déplacement et en contraintes. D'autre part, une analyse des caractéristiques des équations de la propagation conduit à faire une comparaison avec les caractéristiques des équations de la mécanique des fluides et d'indiquer les conditions de la filiation. La discrétisation des équations est basée sur les schémas en grilles décalées. On effectue des développements de Taylor à des ordres élevés et une analyse de l'erreur de discrétisation par transformée de Fourier. Puis, on introduit la notion d'approximation optimale en contraste avec les approximations basées sur l'erreur de troncature. Les schémas construits restent de type convolutif. Le calcul s'avère très efficace sur la base de l'erreur relative de discrétisation. L'algorithme de calcul des coefficients d'approximation optimale est fourni en Fortran dans une annexe. L'élévation de l'ordre en temps consiste à reporter le calcul des dérivées d'ordre élevé en temps sur des dérivées d'ordre élevé en espace. Enfin, l'analyse des conditions de stabilité et de dispersion est réalisée pour prendre en compte l'approximation optimale des dérivées pour des ordres élevés en espace et en temps.
Download or read book La Propagation Des Ondes written by Guy Boillat and published by . This book was released on 1965 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cosmos written by Alexander von Humboldt and published by . This book was released on 1868 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book La Propagation Verticale Des Ondes Planetaires written by Daniel Beauchamp and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book lectrographies de fond de mer une r volution dans la prospection p troli re written by SAINSON Stéphane and published by Lavoisier. This book was released on 2012-05-02 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: L’électrographie de fond de mer (EFM) regroupe les méthodes électromagnétiques d’exploration du sous-sol marin et plus spécifiquement celles dédiées à la prospection des hydrocarbures en mer. Apparues commercialement en 2000, ces techniques, avec plus de 500 opérations industrielles, présentent après 10 ans de succès commerciaux un taux record de découverte de près de 90 %, et semblent aujourd’hui bouleverser la donne en matière de recherche pétrolière offshore. En proposant un indice de présence d’hydrocarbures sérieux, l’EFM couplée à la sismique réflexion est probablement la première méthode fiable de détection directe des hydrocarbures. Complétant les concepts structuralistes de la prospection indirecte en vigueur depuis les années 1920, l’EFM modifie aujourd’hui radicalement l’approche et les philosophies d’exploration, en particulier celles incluant en aval les activités de forages et de diagraphies de fond de trou. S’appuyant sur les lois de l’électromagnétisme (équations de Maxwell), Électrographies de fond de mer décrit et analyse en détail les principes physiques, les méthodes, les techniques et les technologies mis en œuvre ou en voie de l’être. De plus, une note historique montrant l’évolution des idées, des concepts et des matériels depuis les années 1930, dates des premières tentatives, complète chaque chapitre. Synthèse unique, cet ouvrage abondamment illustré constitue un véritable outil de réflexion sur l’utilisation en prospection de l’énergie électromagnétique en milieu conducteur (eau de mer) fixant ainsi les limites théoriques et pratiques de ces investigations pour les développements à venir. Destiné aux géophysiciens et géologues du pétrole, il sera également utile aux physiciens du globe, aux ingénieurs réservoir, aux diagraphistes, aux log analysts, ainsi qu’à tous les étudiants en géosciences.
Download or read book Mechanical Behavior of Anisotropic Solids Comportment M chanique des Solides Anisotropes written by J.P. Boehler and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 926 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1978, the European Mechanics Committee and the French Centre National de la Recherche Scientifique agreed to the organization of an Interna tional Colloquium on the "Mechanical Behavior of Anisotropic Solids". The meeting was held at Villard-de-Lans (near Grenoble, France) from 19th to 22 nd June 1979. The Colloquium considered mechanical aspects of the anisotropy of solids, both initial and induced by permanent deformation, anisotropic hardening and damage, oriented fissuration, etc. Topics concerned mathematical, experimental and engineering aspects of the anisotropy of metals, composites, soils and rocks. The aim of the Colloquium was to bring together experimentalists, theoretecians and engineers interested in various features of mechanical anisotropy, in order to permit an interdisciplinary exchange of understanding, experience and methods. A detailed description of the scope, aim and proposed topics is contained in the Preface. The announcement of the Colloquium attracted a large number of sub mitted contributions. Conforming with the principles of Euromech Colloquia and of the Colloques Internationaux du CNRS, the accepted contributions were limited to 50 communications. A general description of the scientific program is to be found in the Preface. Five general lectures gave state-of-the-art reports concerning some areas of the behavior of anisotropic solids; the 50 communications were divided into 12 sessions dealing with specific topics (see "Contents"). In order to facilitate subsequent contact between the reader and the contributors, full addresses are given in the "List of Authors."
Download or read book Institutions and Applications written by David E. Rowe and published by Academic Press. This book was released on 2014-06-28 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: The History of Modern Mathematics, Volume II: Institutions and Applications focuses on the history and progress of methodologies, techniques, principles, and approaches involved in modern mathematics. The selection first elaborates on crystallographic symmetry concepts and group theory, case of potential theory and electrodynamics, and geometrization of analytical mechanics. Discussions focus on differential geometry and least action, intrinsic differential geometry, physically-motivated research in potential theory, introduction of potentials in electrodynamics, and group theory and crystallography in the mid-19th century. The text then elaborates on Schouten, Levi-Civita, and emergence of tensor calculus, modes and manners of applied mathematics, and pure and applied mathematics in divergent institutional settings in Germany. Topics include function of mathematics within technical colleges, evolvement of the notion of applied mathematics, rise of technical colleges, and an engineering approach to mechanics. The publication examines the transformation of numerical analysis by the computer; mathematics at the Berlin Technische Hochschule/Technische Universität; and contribution of mathematical societies to promoting applications of mathematics in Germany. The selection is a valuable reference for mathematicians and researchers interested in the history of modern mathematics. - Mathematical institutions in France and Germany and their role in promoting applications - Relationship between mathematics and physics - Foundations of mathematics - Complex variable theory, geometry and topology - Geometry in the spirit of Klein's Erlangen program - Algebra and number theory - Formative influences on mathematics in the United States
Download or read book Ground Improvement Geosystems written by Michael C. R. Davies and published by Thomas Telford. This book was released on 1997 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers presented in this volume describe the latest developments from around the world on ground improvement by densification and reinforcement. They describe new research into improving the understanding of the problems facing geotechnical engineers working in the field of ground improvement and the advances in the techniques available to them. Numerous case studies show how new and improved methods have actually been applied over a wide variety of ground conditions.
Download or read book Cosmos written by Alexander von Humboldt and published by BoD – Books on Demand. This book was released on 2024-02-02 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reprint of the original, first published in 1875.
Download or read book Tropospheric Radiowave Propagation Beyond the Horizon written by François Du Castel and published by Elsevier. This book was released on 2017-04-27 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tropospheric Radiowave Propagation Beyond the Horizon deals with developments concerning the tropospheric propagation of ultra-short radio waves beyond the horizon, with emphasis on the relationship between the theoretical and the experimental. Topics covered include the general conditions of propagation in the troposphere; general characteristics of propagation beyond the horizon; and attenuation in propagation. This volume is comprised of six chapters and begins with a brief historical look at the various stages that have brought the technique of transhorizon links to its state of development. The discussion then turns to the physical properties of the troposphere and the phenomenon of tropospheric propagation; influence of the troposphere and the Earth on transhorizon propagation; and theoretical and experimental determination of attenuation in propagation. Experimental data relating to transhorizon propagation are presented. Theories of diffraction and turbulent scattering are described. This book will be helpful to physicists and physics students as well as those who are engaged in the problem of long-range telecommunication and in the interdependence of theory and experience.
Download or read book Uneasy Genius The Life And Work Of Pierre Duhem written by St.L. Jaki and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: A hundred years have now gone by since in the midsummer of 1882 Pierre Duhem, a graduate of College Stanislas, completed with brilliant success his entrance exams to the Ecole Normale Superieure and embarked on his career as a theoretical physicist. His father, a textile salesman, hoped that Hierre would pursue a career in business, one of the few professional fields where perhaps he would not have succeeded. Not that young Duhem lacked sense for the practical. He could have easily made a name for himself as an artist had he developed professionally his skill to draw portraits and landscapes. His ability to make a point and his readiness to join in a debate, could have earned him fame as a lawyer. A potential actor was in sight when he entertained friends with mimicry. That as a student of physics he entered and stayed first in his class at the Ecole Normale, did not thwart his talents for the life sciences. No less a biologist than Pasteur tried to obtain Duhem for assistant. His command of Greek and Latin would have secured him a career as a classicist. He was a Frenchman, not to be met too often, whose rightful ad miration for and mastery of his native tongue, did not prove a barrier to the major modern languages. As one who taught himself the complex art of medieval paleo graphy, he could easily have mastered the many auxiliary sciences needed by a consummate historian.
Download or read book Mat riaux artificiels ing nierie de dispersion des micro ondes l optique written by VANBESIEN Olivier and published by Lavoisier. This book was released on 2012-04-16 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce livre propose une synthèse des recherches - des concepts jusqu'aux applications - sur les matériaux artificiels, incluant les cristaux photoniques et les métamatériaux. Il expose les enjeux de performance et les défis de fabrication (jusqu'à l'échelle du nanomètre) pour l'exploitation des effets d'ultra-réfraction ou de réfraction négative induits par l'ingénierie généralisée ou localisée de la dispersion sur l'ensemble du spectre électromagnétique (des micro-ondes à l'optique en passant par le térahertz et l'infrarouge). Didactique, Matériaux artificiels analyse les possibilités de l'optique de transformation tels que les mirages optiques, les lentilles parfaites, les tapis magiques et les capes d'invisibilité. Présentés comme potentiels précurseurs de nouveaux systèmes de contrôle de la propagation des ondes et/ou d'imagerie pour les domaines des télécommunications, de la biologie ou de la médecine, ils permettent d'identifier les principaux verrous théoriques et technologiques actuels.
Download or read book NBS Technical Note written by and published by . This book was released on 1965-04 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Twenty Seventh International Congress on Large Dams Vingt Septi me Congr s International des Grands Barrages written by ICOLD CIGB and published by CRC Press. This book was released on 2022-05-25 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Committee on Large Dams (ICOLD) held its 27th International Congress in Marseille, France (12-19 November 2021). The proceedings of the congress focus on four main questions: 1. Reservoir sedimentation and sustainable development; 2. Safety and risk analysis; 3. Geology and dams, and 4. Small dams and levees. The book thoroughly discusses these questions and is indispensable for academics, engineers and professionals involved or interested in engineering, hydraulic engineering and related disciplines.
Download or read book Wave Propagation in Dissipative Materials written by B.D. Coleman and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: Common experience reveals two basic aspects of wave propagation. First, while preserving their identity and travelling at definite speeds, sounds finally die out. Second, weak sounds may combine to form strong noises. Theories of acoustic propagation have succeeded in representing these aspects of experience separately, but never combined as in nature. The classical theories of sound in perfect fluids and elastic solids easily yield common speeds of propagation for plane infinitesimal disturbances, but no damping. Moreover, within EULER'S theory of the perfect fluid, or its generalization, the GREEN-KIRCHHOFF-KELVIN theory of finite elasticity, weak waves may grow stronger and become shock waves, which propagate according to more complicated but equally definite principles. Effects of internal damping are easily added for theories of infinitesimal deformation, but for finite motions a dead end was reached about sixty years ago. Indeed, in 1901 DUHEM proved that according to the NAVIER-STOKES theory of fluids acceleration waves and waves of higher order cannot exist, and for shock waves he claimed a similar result, which has since been shown to be valid subject to certain qualifications. So as to save the phenomena of sound and noise, as was necessary if the NAVIER-STOKES theory was to deserve the place proposed for it as a refinement upon EULER'S theory, DUHEM introduced the concept of "quasi-wave", a region of rapid but continuous transition.
Download or read book National Bureau of Standards Report written by United States. National Bureau of Standards and published by . This book was released on 1958 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:
