Book Description
UNE ETUDE BIBLIOGRAPHIQUE DES TRAVAUX EXPERIMENTAUX ET THEORIQUES SUR LA PROPAGATION DES ONDES ELECTROMAGNETIQUES DANS LES MATERIAUX HETEROGENES EST PRESENTEE. ON MONTRE QU'UNE BONNE COMPREHENSION DES FAITS OBSERVES SE HEURTE A DES DIFFICULTES D'ORDRE TANT EXPERIMENTAL QUE THEORIQUE. UNE ETUDE EXPERIMENTALE DE LA SPECTROSCOPIE, ENTRE 0.3 ET 2M, DE MATERIAUX HETEROGENES MODELES CONSTITUES DE PARTICULES DE NOIR DE CARBONE DANS UNE MATRICE DE KBR A ETE REALISEE. ELLE DEMONTRE QUE LES THEORIES DU MILIEU EFFECTIF RENDENT CORRECTEMENT COMPTE DES RESULTATS OBTENUS LORSQUE LES PARTICULES SONT PETITES DEVANT LA LONGUEUR D'ONDE ET EN CONCENTRATION FAIBLE. AUX CONCENTRATIONS PLUS ELEVEES (1 A 60% EN VOLUME) ON OBSERVE DES COMPORTEMENTS ORIGINAUX QUE CES THEORIES NE PEUVENT EXPLIQUER
Author: Jean Vareille Publisher: ISBN: Category : Languages : fr Pages : 169
Book Description
NOUS AVONS ETUDIE EXPERIMENTALEMENT LA MECANIQUE DE LA DEFORMATION DE DEUX MATERIAUX COMPOSITES ALEATOIRES SOUMIS A DES CONTRAINTES PURES. NOUS NOUS SONNES ATTACHES AU CAS PARTICULIER DES MATERIAUX COMPOSITES FIBRES DE GRAPHITE GEL DE POLYACRYLAMIDE, QUE NOUS SOUMETTIONS A UNE COMPRESSION UNIAXIALE ET DESQUELS NOUS AVONS ETUDIE LE MODULE D'YOUNG EN FONCTION DE LA CONCENTRATION EN FIBRES. CES MATERIAUX PRESENTENT UN EFFET DE SEUIL MECANIQUE QUI SE TRADUIT PAR UNE FORTE DISPERSION DE RESULTATS DANS UNE ZONE ETENDUE DE CONCENTRATION AUTOUR DE LA CONCENTRATION CRITIQUE, ET PAR UNE EVOLUTION RAPIDE DU MODULE D'YOUNG MOYEN. NOUS AVONS TENTE D'INTERPRETER CES RESULTATS A L'AIDE DE LA THEORIE DE LA PERCOLATION ET DE SES NOUVEAUX DEVELOPPEMENTS. CECI NOUS A PERMIS DE COMPRENDRE LES CAUSES DES PHENOMENES OBSERVES, TOUTEFOIS UN DESACCORD SUBSISTE SUR CERTAINS CALCULS QUANTITATIFS
Author: Domenico Delli Gatti Publisher: Springer Science & Business Media ISBN: 3642570054 Category : Business & Economics Languages : en Pages : 302
Book Description
This book is a collection of essays which examine how the properties of aggregate variables are influenced by the actions and interactions of heterogenous individuals in different economic contexts. The common denominator of the essays is a critique of the representative agent hypothesis. If this hypothesis were correct, the behaviour of the aggregate variable would simply be the reproduction of individual optimising behaviour. In the methodology of the hard sciences, one of the achievements of the quantum revolution has been the rebuttal of the notion that aggregate behaviour can be explained on the basis of the behaviour of a single unit: the elementary particle does not even exist as a single entity but as a network, a system of interacting units. In this book, new tracks in economics which parallel the developments in physics mentioned above are explored. The essays, in fact are contributions to the analysis of the economy as a complex evolving system of interacting agents.
Author: Scott Armstrong Publisher: Springer ISBN: 3030155455 Category : Mathematics Languages : en Pages : 518
Book Description
The focus of this book is the large-scale statistical behavior of solutions of divergence-form elliptic equations with random coefficients, which is closely related to the long-time asymptotics of reversible diffusions in random media and other basic models of statistical physics. Of particular interest is the quantification of the rate at which solutions converge to those of the limiting, homogenized equation in the regime of large scale separation, and the description of their fluctuations around this limit. This self-contained presentation gives a complete account of the essential ideas and fundamental results of this new theory of quantitative stochastic homogenization, including the latest research on the topic, and is supplemented with many new results. The book serves as an introduction to the subject for advanced graduate students and researchers working in partial differential equations, statistical physics, probability and related fields, as well as a comprehensive reference for experts in homogenization. Being the first text concerned primarily with stochastic (as opposed to periodic) homogenization and which focuses on quantitative results, its perspective and approach are entirely different from other books in the literature.
Author: Canada. Department of Fisheries and Oceans Publisher: Peches Et Oceans Direction Generale Des Communications = Fisheries and Oceans Communications Dir ISBN: Category : Science Languages : fr Pages : 376
Book Description
Proceedings of a workshop, the scientific reviews and the contributed papers presented at the symposium. The document presents a brief historical summary of marine research in the Gulf; reports the discussions, conclusions and recommendations of the different working groups on oceanography (physics, biology, chemistry and sedimentology) and on the fishery (fish and invertebrates); then presents the discussions of each multidisciplinary working group, centered around how the St. Lawrence system may be used as a natural laboratory which will contribute to the solution of major long-term problems of conservation of natural resources and of the quality of the environment.
Author: Benoit B. Mandelbrot Publisher: Profile Books ISBN: 1847651550 Category : Business & Economics Languages : en Pages : 352
Book Description
This international bestseller, which foreshadowed a market crash, explains why it could happen again if we don't act now. Fractal geometry is the mathematics of roughness: how to reduce the outline of a jagged leaf or static in a computer connection to a few simple mathematical properties. With his fractal tools, Mandelbrot has got to the bottom of how financial markets really work. He finds they have a shifting sense of time and wild behaviour that makes them volatile, dangerous - and beautiful. In his models, the complex gyrations of the FTSE 100 and exchange rates can be reduced to straightforward formulae that yield a much more accurate description of the risks involved.
Author: DIDIER.. ORDIERA
Author: Jean Vareille
Author: Boris Kohler
Author: Jean Pouget
Author: Roger Balian
Author: 
Author: Domenico Delli Gatti
Author: Scott Armstrong
Author: Canada. Department of Fisheries and Oceans
Author: Benoit B. Mandelbrot