Applications Du Formalisme Des Ondes Planes Heterogenes Dans La Diffusion Acoustique

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APPLICATIONS DU FORMALISME DES ONDES PLANES HETEROGENES DANS LA DIFFUSION ACOUSTIQUE

Author : FREDERIC.. PADILLA
Publisher :
ISBN 13 :
Total Pages : 199 pages
Book Rating : 4.:/5 (78 download)

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Book Synopsis APPLICATIONS DU FORMALISME DES ONDES PLANES HETEROGENES DANS LA DIFFUSION ACOUSTIQUE by : FREDERIC.. PADILLA

Download or read book APPLICATIONS DU FORMALISME DES ONDES PLANES HETEROGENES DANS LA DIFFUSION ACOUSTIQUE written by FREDERIC.. PADILLA and published by . This book was released on 1998 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE MEMOIRE DE THESE A POUR OBJECTIF D'EXPLOITER LE FORMALISME DES ONDES PLANES HETEROGENES DANS LE CADRE DE LA DIFFUSION ACOUSTIQUE. CES ONDES SONT LES ONDES PLANES LES PLUS GENERALES QUI SOIENT, CARACTERISEES PAR UNE DIRECTION DE PROPAGATION ET UNE DIRECTION D'ATTENUATION DISTINCTES. ELLES SONT CARACTERISEES PAR UN BIVECTEUR D'ONDE COMPLEXE. PLUSIEURS CAS SONT TRAITES. LE PREMIER EST L'ONDE DE RAYLEIGH CIRCONFERENTIELLE QUI SE PROPAGE SUR LA SURFACE D'UN CYLINDRE IMMERGE. IL EST MONTRE QUE L'ONDE RAYONNEE DANS LE FLUIDE EST LOCALEMENT EVANESCENTE, ET QU'UNE APPROXIMATION DE LA PRESSION DIFFUSEE A L'ORDRE UN EN FONCTION DU COEFFICIENT D'EVANESCENCE EST SUFFISANTE POUR INTERPRETER LES RESULTATS EXPERIMENTAUX. ON ETUDIE ENSUITE LES ONDES D'INTERFACE PLANE QUAND LA VITESSE DU SON DANS LE FLUIDE EST PLUS GRANDE QUE CELLE DES ONDES DE VOLUME TRANSVERSALES DANS LE SOLIDE (EX : PVC-EAU ET PLEXIGLAS-EAU). UNE ETUDE NUMERIQUE DE L'EQUATION DE DISPERSION MET EN EVIDENCE L'EXISTENCE D'ONDES DE RAYLEIGH ET DE STONELEY NON RAYONNANTES. CES RESULTATS SONT CONFIRMES PAR DES MESURES EXPERIMENTALES DE TEMPS DE VOL SUR DES ECHANTILLONS PARTIELLEMENT IMMERGES. LA TROISIEME PARTIE EST CONSACREE A LA PROPAGATION DES ONDES PLANES HETEROGENES DANS UN ECOULEMENT ILLIMITE. L'EQUATION DE DISPERSION EST RESOLUE GRAPHIQUEMENT GRACE A L'INTRODUCTION D'UN VECTEUR LENTEUR SANS DIMENSION. L'ECOULEMENT INDUIT UNE ANISOTROPIE POUR LA PROPAGATION, QUI SE TRADUIT PAR DES PROPRIETES VECTORIELLES DE LA VITESSE DE L'ENERGIE : ELLE EST LOCALEMENT TANGENTE A LA SURFACE DES LENTEURS ET SA PROJECTION SUR LA DIRECTION DE PROPAGATION EST EGALE A LA VITESSE DE PHASE. CES RESULTATS SONT ENSUITE UTILISES POUR MODELISER LA REFLEXION ET LA REFRACTION SUR DES INTERFACES PLANES ENTRE UN SOLIDE ET UN FLUIDE EN MOUVEMENT UNIFORME (ACIER-AIR, ACIER-EAU, PVC-EAU). ON MET PAR EXEMPLE EN EVIDENCE L'EXISTENCE DE MODES D'INTERFACE QUI DEVIENNENT RAYONNANTS AU-DELA D'UNE VITESSE CRITIQUE DU NOMBRE DE MACH.

Propriétés acoustiques des matériaux

Author : Parviz Navi
Publisher : EPFL Press
ISBN 13 : 2880746914
Total Pages : 276 pages
Book Rating : 4.8/5 (87 download)

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Book Synopsis Propriétés acoustiques des matériaux by : Parviz Navi

Download or read book Propriétés acoustiques des matériaux written by Parviz Navi and published by EPFL Press. This book was released on 2006-01-01 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cet ouvrage présente tout d'abord les principaux éléments de l'acoustique physique et les bases analytiques nécessaires à la description du phénomène de propagation des ondes planes harmoniques. Sont traités les cas des fluides et des solides, qu'ils soient homogènes ou hétérogènes, purement élastiques ou viscoélastiques. A partir des modèles développés, des méthodes de caractérisation non-destructive des propriétés effectives des milieux précités ont été établies. Ces modèles, appliqués à la formule générale du transfert, constituent un puissant outil permettant de traiter la quasi-totalité des problèmes d'absorption et d'isolation rencontrés dans les matériaux de construction. En marge des préoccupations liées à notre environnement sonore, cette problématique concerne également les phénomènes vibratoires liés aux manifestations sismiques, les techniques émergentes de microscopie acoustique ou encore de contrôle de qualité in-situ. [Source : 4e de couv.]

Journal de Physique

Author :
Publisher :
ISBN 13 :
Total Pages : 640 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Journal de Physique by :

Download or read book Journal de Physique written by and published by . This book was released on 1991 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Flows and Chemical Reactions in Heterogeneous Mixtures

Author : Roger Prud'homme
Publisher : John Wiley & Sons
ISBN 13 : 1848217854
Total Pages : 204 pages
Book Rating : 4.8/5 (482 download)

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Book Synopsis Flows and Chemical Reactions in Heterogeneous Mixtures by : Roger Prud'homme

Download or read book Flows and Chemical Reactions in Heterogeneous Mixtures written by Roger Prud'homme and published by John Wiley & Sons. This book was released on 2014-12-03 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book - a sequel of previous publications 'Flows and Chemical Reactions' and 'Chemical Reactions in Flows and Homogeneous Mixtures' - is devoted to flows with chemical reactions in heterogeneous environments. Heterogeneous media in this volume include interfaces and lines. They may be the site of radiation. Each type of flow is the subject of a chapter in this volume. We consider first, in Chapter 1, the question of the generation of environments biphasic individuals: dusty gas, mist, bubble flow. Chapter 2 is devoted to the study at the mesoscopic scale: particle-fluid exchange of momentum and heat with determination of the respective exchange coefficients. In Chapter 3, we establish simplified equations of macroscopic balance for mass, for the momentum and energy, in the case of particles of one size (monodisperse suspension). Radiative phenomena are presented in Chapter 5.

Waves and Vibrations in Soils

Author : Jean-François Semblat
Publisher : Iuss Press
ISBN 13 :
Total Pages : 510 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Waves and Vibrations in Soils by : Jean-François Semblat

Download or read book Waves and Vibrations in Soils written by Jean-François Semblat and published by Iuss Press. This book was released on 2009 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Inequalities in Mechanics and Physics

Author : G. Duvant
Publisher : Springer Science & Business Media
ISBN 13 : 3642661653
Total Pages : 415 pages
Book Rating : 4.6/5 (426 download)

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Book Synopsis Inequalities in Mechanics and Physics by : G. Duvant

Download or read book Inequalities in Mechanics and Physics written by G. Duvant and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1. We begin by giving a simple example of a partial differential inequality that occurs in an elementary physics problem. We consider a fluid with pressure u(x, t) at the point x at the instant t that 3 occupies a region Q oflR bounded by a membrane r of negligible thickness that, however, is semi-permeable, i. e., a membrane that permits the fluid to enter Q freely but that prevents all outflow of fluid. One can prove then (cf. the details in Chapter 1, Section 2.2.1) that au (aZu azu aZu) (1) in Q, t>o, -a - du = g du = -a z + -a z + -a z t Xl X X3 z l g a given function, with boundary conditions in the form of inequalities u(X,t»o => au(x,t)/an=O, XEr, (2) u(x,t)=o => au(x,t)/an?:O, XEr, to which is added the initial condition (3) u(x,O)=uo(x). We note that conditions (2) are non linear; they imply that, at each fixed instant t, there exist on r two regions r~ and n where u(x, t) =0 and au (x, t)/an = 0, respectively. These regions are not prescribed; thus we deal with a "free boundary" problem.

Mechanics of Generalized Continua

Author : Gérard A. Maugin
Publisher : Springer Science & Business Media
ISBN 13 : 1441956956
Total Pages : 337 pages
Book Rating : 4.4/5 (419 download)

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Book Synopsis Mechanics of Generalized Continua by : Gérard A. Maugin

Download or read book Mechanics of Generalized Continua written by Gérard A. Maugin and published by Springer Science & Business Media. This book was released on 2010-03-24 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: In their 1909 publication Théorie des corps déformables, Eugène and François Cosserat made a historic contribution to materials science by establishing the fundamental principles of the mechanics of generalized continua. The chapters collected in this volume showcase the many areas of continuum mechanics that grew out of the foundational work of the Cosserat brothers. The included contributions provide a detailed survey of the most recent theoretical developments in the field of generalized continuum mechanics and can serve as a useful reference for graduate students and researchers in mechanical engineering, materials science, applied physics and applied mathematics.

Mathematical Methods for Wave Phenomena

Author : Norman Bleistein
Publisher : Academic Press
ISBN 13 : 0080916953
Total Pages : 360 pages
Book Rating : 4.0/5 (89 download)

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Book Synopsis Mathematical Methods for Wave Phenomena by : Norman Bleistein

Download or read book Mathematical Methods for Wave Phenomena written by Norman Bleistein and published by Academic Press. This book was released on 2012-12-02 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computer Science and Applied Mathematics: Mathematical Methods for Wave Phenomena focuses on the methods of applied mathematics, including equations, wave fronts, boundary value problems, and scattering problems. The publication initially ponders on first-order partial differential equations, Dirac delta function, Fourier transforms, asymptotics, and second-order partial differential equations. Discussions focus on prototype second-order equations, asymptotic expansions, asymptotic expansions of Fourier integrals with monotonic phase, method of stationary phase, propagation of wave fronts, and variable index of refraction. The text then examines wave equation in one space dimension, as well as initial boundary value problems, characteristics for the wave equation in one space dimension, and asymptotic solution of the Klein-Gordon equation. The manuscript offers information on wave equation in two and three dimensions and Helmholtz equation and other elliptic equations. Topics include energy integral, domain of dependence, and uniqueness, scattering problems, Green's functions, and problems in unbounded domains and the Sommerfeld radiation condition. The asymptotic techniques for direct scattering problems and the inverse methods for reflector imaging are also elaborated. The text is a dependable reference for computer science experts and mathematicians pursuing studies on the mathematical methods of wave phenomena.

A Parallel Finite Volume Algorithm for Large-eddy Simulation of Turbulent Flows

Author : Trong T. Bui
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis A Parallel Finite Volume Algorithm for Large-eddy Simulation of Turbulent Flows by : Trong T. Bui

Download or read book A Parallel Finite Volume Algorithm for Large-eddy Simulation of Turbulent Flows written by Trong T. Bui and published by . This book was released on 1998 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Phononic Crystals

Author : Vincent Laude
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 3110387913
Total Pages : 494 pages
Book Rating : 4.1/5 (13 download)

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Book Synopsis Phononic Crystals by : Vincent Laude

Download or read book Phononic Crystals written by Vincent Laude and published by Walter de Gruyter GmbH & Co KG. This book was released on 2015-09-14 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phononic crystals are artificial periodic structures that can alter efficiently the flow of sound, acoustic waves, or elastic waves. They were introduced about twenty years ago and have gained increasing interest since then, both because of their amazing physical properties and because of their potential applications. The topic of phononic crystals stands as the cross-road of physics (condensed matter physics, wave propagation in inhomogeneous and periodic media) and engineering (acoustics, ultrasonics, mechanical engineering, electrical engineering). Phononic crystals cover a wide range of scales, from meter-size periodic structures for sound in air to nanometer-size structures for information processing or thermal phonon control in integrated circuits. Phononic crystals have a definite relation with the topic of photonic crystals in optics. The marriage of phononic and photonic crystals also provides a promising structural basis for enhanced sound and light interaction. As the topic is getting popular, it is nowadays presented and discussed at various international conferences. After the first ten years during which the topic has remained mainly theoretical with a few proof-of-concept demonstrations in the literature, the evolution has been towards applications, instrumentation, and novel designs. The physical explanations for various effects are now well understood and efficient numerical methods and analysis tools have been developed. The book contains a comprehensive set of finite element model (FEM) scripts for solving basic phononic crystal problems. The scripts are short, easy to read, and efficient, allowing the reader to generate for him(her)self band structures for 2D and 3D phononic crystals, to compute Bloch waves, waveguide and cavity modes, and more.

An Introduction to Differential Manifolds

Author : Jacques Lafontaine
Publisher : Springer
ISBN 13 : 3319207350
Total Pages : 408 pages
Book Rating : 4.3/5 (192 download)

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Book Synopsis An Introduction to Differential Manifolds by : Jacques Lafontaine

Download or read book An Introduction to Differential Manifolds written by Jacques Lafontaine and published by Springer. This book was released on 2015-07-29 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an introduction to differential manifolds. It gives solid preliminaries for more advanced topics: Riemannian manifolds, differential topology, Lie theory. It presupposes little background: the reader is only expected to master basic differential calculus, and a little point-set topology. The book covers the main topics of differential geometry: manifolds, tangent space, vector fields, differential forms, Lie groups, and a few more sophisticated topics such as de Rham cohomology, degree theory and the Gauss-Bonnet theorem for surfaces. Its ambition is to give solid foundations. In particular, the introduction of “abstract” notions such as manifolds or differential forms is motivated via questions and examples from mathematics or theoretical physics. More than 150 exercises, some of them easy and classical, some others more sophisticated, will help the beginner as well as the more expert reader. Solutions are provided for most of them. The book should be of interest to various readers: undergraduate and graduate students for a first contact to differential manifolds, mathematicians from other fields and physicists who wish to acquire some feeling about this beautiful theory. The original French text Introduction aux variétés différentielles has been a best-seller in its category in France for many years. Jacques Lafontaine was successively assistant Professor at Paris Diderot University and Professor at the University of Montpellier, where he is presently emeritus. His main research interests are Riemannian and pseudo-Riemannian geometry, including some aspects of mathematical relativity. Besides his personal research articles, he was involved in several textbooks and research monographs.

Aeronomy

Author : P. M. Banks
Publisher : Elsevier
ISBN 13 : 1483260666
Total Pages : 445 pages
Book Rating : 4.4/5 (832 download)

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Book Synopsis Aeronomy by : P. M. Banks

Download or read book Aeronomy written by P. M. Banks and published by Elsevier. This book was released on 2013-09-24 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aeronomy, Part A is an attempt to make a comprehensive exposition of the processes in aeronomy, the study of composition, movement, and thermal balance of the upper regions of the planetary atmosphere. The text covers topics such as atmospheric regions and atmospheric density, the temperature and molecular mass of the atmosphere; the permanent constituents and the molecular and isotonic composition of the homosphere; and the transition from the homosphere to the heterosphere. Also covered are topics such as the temperature gradient and energies in the thermosphere, conditions at 200km and above 250km, solar radiation and ionization, and aeronomic reactions. The book is recommended for scientists, especially natural physicists, who would like to know more about the field of aeronomy and its advances.

TOF Range-Imaging Cameras

Author : Fabio Remondino
Publisher : Springer Science & Business Media
ISBN 13 : 3642275230
Total Pages : 243 pages
Book Rating : 4.6/5 (422 download)

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Book Synopsis TOF Range-Imaging Cameras by : Fabio Remondino

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.

Local Approximation Techniques in Signal and Image Processing

Author : Vladimir I︠A︡kovlevich Katkovnik
Publisher : SPIE-International Society for Optical Engineering
ISBN 13 :
Total Pages : 584 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Local Approximation Techniques in Signal and Image Processing by : Vladimir I︠A︡kovlevich Katkovnik

Download or read book Local Approximation Techniques in Signal and Image Processing written by Vladimir I︠A︡kovlevich Katkovnik and published by SPIE-International Society for Optical Engineering. This book was released on 2006 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with a wide class of novel and efficient adaptive signal processing techniques developed to restore signals from noisy and degraded observations. These signals include those acquired from still or video cameras, electron microscopes, radar, X-rays, or ultrasound devices, and are used for various purposes, including entertainment, medical, business, industrial, military, civil, security, and scientific. In many cases useful information and high quality must be extracted from the imaging. However, often raw signals are not directly suitable for this purpose and must be processed in some way. Such processing is called signal reconstruction. This book is devoted to a recent and original approach to signal reconstruction based on combining two independent ideas: local polynomial approximation and the intersection of confidence interval rule.

Soot Formation in Combustion

Author : Henning Bockhorn
Publisher : Springer Science & Business Media
ISBN 13 : 3642851673
Total Pages : 595 pages
Book Rating : 4.6/5 (428 download)

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Book Synopsis Soot Formation in Combustion by : Henning Bockhorn

Download or read book Soot Formation in Combustion written by Henning Bockhorn and published by Springer Science & Business Media. This book was released on 2013-03-08 with total page 595 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soot Formation in Combustion represents an up-to-date overview. The contributions trace back to the 1991 Heidelberg symposium entitled "Mechanism and Models of Soot Formation" and have all been reedited by Prof. Bockhorn in close contact with the original authors. The book gives an easy introduction to the field for newcomers, and provides detailed treatments for the specialists. The following list of contents illustrates the topics under review:

Direct Numerical Simulations of Gas–Liquid Multiphase Flows

Author : Grétar Tryggvason
Publisher : Cambridge University Press
ISBN 13 : 1139496700
Total Pages : 337 pages
Book Rating : 4.1/5 (394 download)

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Book Synopsis Direct Numerical Simulations of Gas–Liquid Multiphase Flows by : Grétar Tryggvason

Download or read book Direct Numerical Simulations of Gas–Liquid Multiphase Flows written by Grétar Tryggvason and published by Cambridge University Press. This book was released on 2011-03-10 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurately predicting the behaviour of multiphase flows is a problem of immense industrial and scientific interest. Modern computers can now study the dynamics in great detail and these simulations yield unprecedented insight. This book provides a comprehensive introduction to direct numerical simulations of multiphase flows for researchers and graduate students. After a brief overview of the context and history the authors review the governing equations. A particular emphasis is placed on the 'one-fluid' formulation where a single set of equations is used to describe the entire flow field and interface terms are included as singularity distributions. Several applications are discussed, showing how direct numerical simulations have helped researchers advance both our understanding and our ability to make predictions. The final chapter gives an overview of recent studies of flows with relatively complex physics, such as mass transfer and chemical reactions, solidification and boiling, and includes extensive references to current work.

Precisions on the Present State of Architecture and City Planning

Author : Le Corbusier
Publisher : Park Publishing (WI)
ISBN 13 : 9783906027654
Total Pages : 304 pages
Book Rating : 4.0/5 (276 download)

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Book Synopsis Precisions on the Present State of Architecture and City Planning by : Le Corbusier

Download or read book Precisions on the Present State of Architecture and City Planning written by Le Corbusier and published by Park Publishing (WI). This book was released on 2015-03 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coinciding with the 50th anniversary of his death (August 27, 2015), one of Le Corbusier's most significant books becomes available again in English. We are doing a reprint of MIT Press's first edition of 1991, which again is based on the original French version of 1930, with an introduction added by the author in 1960. While the MIT Press version had black-and-white illustrations throughout, Park Books' new edition features some of Le Corbusier's drawings in color as they were in the earlier French editions. A new essay by British scholar Tim Benton, written for this new edition, contextualizes the book within Le Corbusier's oeuvre and comments on its lasting significance. An also new appendix explains specialist terms and provides background information on persons and historic events no longer necessarily known to a younger generation of architects. The Precisions, as the book is known commonly, emerged from a spontaneous and exuberant series of 10 lectures Le Corbusier gave in Buenos Aires during the fall of 1929. As he spoke, Le Corbusier improvised drawings on large sheets of paper with crayons. While similar drawings appear in other works, here all the lectures and images appear in their original context as Le Corbusier assembled them more than 80 years ago. The texts reflect a new maturity in Le Corbusier's thinking and an extreme confidence in the development of his ideas. The drawings and lectures are unique in their eloquent and concise summary of his philosophy of architecture and urban design, stating the principles that informed his work from the 1920s on. They contain some of his most compelling aphorisms, both verbal and visual, covering technique as the basis of architecture, the human scale in design, furniture, the private house, apartments and office buildings, the city, the League of Nations competition, teaching architecture, and a splendid analysis of the transformation of his own work in houses from La Roche-Jeanneret to the Villa Savoye. [Based on MIT Press's copy for their 1991 edition]