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Author: Jean-Claude Lesueur
Publisher:
ISBN:
Category :
Languages : fr
Pages : 118
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Book Description
LE BUT DE CES TRAVAUX EST D'ANALYSER LA PROPAGATION DES ONDES ACOUSTIQUES DANS LES RESEAUX BIDIMENSIONNELS. CETTE ANALYSE EST APPREHENDEE PAR LA CONSTRUCTION D'UNE MATRICE ADMITTANCE GLOBALE D'UN RESEAU SUFFISAMMENT IMPORTANT (7070 TUYAUX ASSEMBLES ENTRE EUX). LES RESULTATS NUMERIQUES SONT COMPARES A UN MODELE UTILISANT EN PARTICULIER LE CALCUL DE LA FONCTION DE GREEN DU RESEAU INFINI: EN BANDE D'ARRET, ON DEDUIT L'EXPOSANT DE DECROISSANCE DU RAPPORT DES PRESSIONS EN DES NUDS ADJACENTS EN BANDE PASSANTE LE NOMBRE D'ONDE EN TRAITANT LES VALEURS DES PRESSIONS PAR FFT. DES RESULTATS THEORIQUES SONT EN OUTRE OBTENUS EN DEDUISANT DE LA FONCTION DE GREEN DES RELATIONS DE RECURRENCE DANS LES DIRECTIONS PRINCIPALES DU RESEAU, ET UN CALCUL DE LA DIRECTIVITE EN CHAMP LOINTAIN BASE SUR LA METHODE DE LA PHASE STATIONNAIRE. ON CONCLUT SUR LES PROPRIETES DE BANDES PASSANTES ET BANDES D'ARRET DU RESEAU EN MONTRANT EN PARTICULIER QUE DANS UN RESEAU SIMPLE, SANS DERIVATIONS AUX NUDS, IL Y A TOUJOURS PROPAGATION.
Author: Jean-Claude Lesueur
Publisher:
ISBN:
Category :
Languages : fr
Pages : 118
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Book Description
LE BUT DE CES TRAVAUX EST D'ANALYSER LA PROPAGATION DES ONDES ACOUSTIQUES DANS LES RESEAUX BIDIMENSIONNELS. CETTE ANALYSE EST APPREHENDEE PAR LA CONSTRUCTION D'UNE MATRICE ADMITTANCE GLOBALE D'UN RESEAU SUFFISAMMENT IMPORTANT (7070 TUYAUX ASSEMBLES ENTRE EUX). LES RESULTATS NUMERIQUES SONT COMPARES A UN MODELE UTILISANT EN PARTICULIER LE CALCUL DE LA FONCTION DE GREEN DU RESEAU INFINI: EN BANDE D'ARRET, ON DEDUIT L'EXPOSANT DE DECROISSANCE DU RAPPORT DES PRESSIONS EN DES NUDS ADJACENTS EN BANDE PASSANTE LE NOMBRE D'ONDE EN TRAITANT LES VALEURS DES PRESSIONS PAR FFT. DES RESULTATS THEORIQUES SONT EN OUTRE OBTENUS EN DEDUISANT DE LA FONCTION DE GREEN DES RELATIONS DE RECURRENCE DANS LES DIRECTIONS PRINCIPALES DU RESEAU, ET UN CALCUL DE LA DIRECTIVITE EN CHAMP LOINTAIN BASE SUR LA METHODE DE LA PHASE STATIONNAIRE. ON CONCLUT SUR LES PROPRIETES DE BANDES PASSANTES ET BANDES D'ARRET DU RESEAU EN MONTRANT EN PARTICULIER QUE DANS UN RESEAU SIMPLE, SANS DERIVATIONS AUX NUDS, IL Y A TOUJOURS PROPAGATION.
Author:
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 1086
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Book Description
Author:
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 1086
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Book Description
Author: Vasilios Lykousis
Publisher: Springer Science & Business Media
ISBN: 1402065124
Category : Science
Languages : en
Pages : 407
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Book Description
With contributions from leading researchers in science and engineering, this book provides a global perspective on submarine mass movements and their consequences. Authors report on new findings from fundamental as well as site-specific studies from around the world. All studies relied on the most recent technologies, including multi-beam sonar imaging techniques, 3D seismic analysis, slope stability analysis, debris flow, and tsunami modeling.
Author: Jean-François Semblat
Publisher: Iuss Press
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 510
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Book Description
Author: Hermann Schlichting (Deceased)
Publisher: Springer
ISBN: 366252919X
Category : Technology & Engineering
Languages : en
Pages : 814
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Book Description
This new edition of the near-legendary textbook by Schlichting and revised by Gersten presents a comprehensive overview of boundary-layer theory and its application to all areas of fluid mechanics, with particular emphasis on the flow past bodies (e.g. aircraft aerodynamics). The new edition features an updated reference list and over 100 additional changes throughout the book, reflecting the latest advances on the subject.
Author: G. Duvant
Publisher: Springer Science & Business Media
ISBN: 3642661653
Category : Mathematics
Languages : en
Pages : 415
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Book Description
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.
Author: International Atomic Energy Agency
Publisher: International Atomic Energy Agency
ISBN: 9789201063205
Category : Technology & Engineering
Languages : en
Pages : 72
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Book Description
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.
Author: Gérard A. Maugin
Publisher: Springer Science & Business Media
ISBN: 1441956956
Category : Mathematics
Languages : en
Pages : 337
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Book Description
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.
Author: Norman Bleistein
Publisher: Academic Press
ISBN: 0080916953
Category : Mathematics
Languages : en
Pages : 360
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Book Description
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.
