Etude de l'interaction entre une onde electromagnetique et un milieu fractal deterministe PDF Download
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Author: Laurent Nivanen
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Author: Laurent Nivanen
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
Get Book Here
Book Description
Author: Laurent Nivanen
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Ce rapport traite de l'interaction entre une onde électromagnétique et un milieu de structure fractale. L'électromagnétisme est aujourd'hui bien maitrise en milieu homogène. Il n'en est pas de même en milieu hétérogène ou on observe fréquemment de fortes absorptions aujourd'hui pour l'essentiel incomprises. La géométrie fractale est un outil porte à l'attention des scientifiques depuis une vingtaine d'années. Elle permet de décrire de façon satisfaisante les milieux hétérogènes. Or du point de vue des phénomènes physiques, les milieux hétérogènes étudies traditionnellement ne présentent qu'un caractère fractal statistique approche. Nous avons pour notre part isole le caractère fractal en parvenant à fabriquer des objets fractals de structure entièrement déterministe. Les expériences ont porte d'une part pour les systèmes plans sur la diffraction par des trous fractals et d'autre part pour les systèmes volumiques sur la propagation des ondes. A deux dimensions, il n'a pas été possible de déceler d'absorption aussi bien sur le plan théorique (théorie de la diffraction de Fraunhofer étendue aux ouvertures fractales) qu'expérimental. En revanche nous avons pu observer une forte absorption sur des objets fractals déterministes, alors que le matériau sous sa forme homogène est peu absorbant. Cette absorption peut être décrite par de nouveaux invariants, équivalents en milieu hétérogènes des paramètres constitutifs habituels.
Author: Anthony Dubois
Publisher:
ISBN:
Category :
Languages : fr
Pages : 204
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Book Description
Ce travail porte sur les problèmes inverses de diffraction d'onde électromagnétique en régime temporel. Il s'agit de déterminer des caractéristiques d'un diffuseur à partir de la mesure d'un champ diffracté. Le caractère muli-fréquences du régime transitoire (par transformée de Laplace) permet de combiner la propriété de convergence à basses fréquences des processus itératifs avec un bon pouvoir de résolution à hautes fréquences. Trois approches ont été abordées dans deux configurations : "espace homogène" et "objets enfouis" (demi-espace). L'inversion harmonique (plusieurs sources, une fréquence) a été combinée avec la méthode de Décomposition de Retournement Temporel lorsque le diffuseur était enfoui dans un milieu hétérogène. L'inversion de données transitoires (une source, plusieurs fréquences pondérées par le spectre du champ incident) a ensuite été abordée. Enfin, une approche multi-fréquences multi-sources a été mise au point et validée sur des champs mesurés expérimentalement.
Author: Benoit B. Mandelbrot
Publisher: Profile Books
ISBN: 1847651550
Category : Business & Economics
Languages : en
Pages : 352
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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: M. B. Paranjape
Publisher: Springer Nature
ISBN: 3030557774
Category : Electronic books
Languages : en
Pages : 670
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Book Description
This volume of the CRM Conference Series is based on a carefully refereed selection of contributions presented at the "11th International Symposium on Quantum Theory and Symmetries", held in Montreal, Canada from July 1-5, 2019. The main objective of the meeting was to share and make accessible new research and recent results in several branches of Theoretical and Mathematical Physics, including Algebraic Methods, Condensed Matter Physics, Cosmology and Gravitation, Integrability, Non-perturbative Quantum Field Theory, Particle Physics, Quantum Computing and Quantum Information Theory, and String/ADS-CFT. There was also a special session in honour of Decio Levi. The volume is divided into sections corresponding to the sessions held during the symposium, allowing the reader to appreciate both the homogeneity and the diversity of mathematical tools that have been applied in these subject areas. Several of the plenary speakers, who are internationally recognized experts in their fields, have contributed reviews of the main topics to complement the original contributions. .
Author: Max Giordano
Publisher: John Wiley & Sons
ISBN: 1118587529
Category : Business & Economics
Languages : en
Pages : 389
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Book Description
This book gives a comprehensive view of the most recent major international research in the field of tolerancing, and is an excellent resource for anyone interested in Computer Aided Tolerating. It is organized into 4 parts. Part 1 focuses on the more general problems of tolerance analysis and synthesis, for tolerancing in mechanical design and manufacturing processes. Part 2 specifically highlights the simulation of assembly with defects, and the influence of tolerances on the quality of the assembly. Part 3 deals with measurement aspects, and quality control throughout the life cycle. Different measurement technologies and methods for estimating uncertainty are considered. In Part 4, different aspects of tolerancing and their interactions are explored, from the definition of functional requirement to measurement processes in a PLM approach.
Author: S Joseph Antony
Publisher: Royal Society of Chemistry
ISBN: 1847550991
Category : Technology & Engineering
Languages : en
Pages : 385
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Book Description
Granular materials play an important role in many industries. Continuous ingenuity and advancement in these industries necessitates the ability to predict the fundamental behaviour of granular materials under different working environments. With contributions from international experts in the field Granular Materials; Fundamentals and Applications details recent advances made in theoretical computational and experimental approaches in understanding the behaviour of granular materials including industrial applications. Topics covered include: * key features of granular plasticity * high temperature particle interactions * influence of polymers on particulate dispersion stability: scanning probe microscopy investigations * in-process measurement of particulate systems Presented by world renowned researchers this book will be welcomed by scientists and engineers working across a wide spectrum of engineering disciplines.
Author: Michael Molloy
Publisher: Springer Science & Business Media
ISBN: 3642040160
Category : Mathematics
Languages : en
Pages : 320
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Book Description
Over the past decade, many major advances have been made in the field of graph coloring via the probabilistic method. This monograph, by two of the best on the topic, provides an accessible and unified treatment of these results, using tools such as the Lovasz Local Lemma and Talagrand's concentration inequality.
Author: Louis Dumont
Publisher: University of Chicago Press
ISBN: 9780226169521
Category : History
Languages : en
Pages : 276
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Book Description
In Dumont's words, the Frenchman sees himself "as being a man by nature, and a Frenchman by accident" while the German feels he is "a German in the first place, and a man through his being a German." Furthermore, while individualism in the French fashion stresses equality and centers in the sociopolitical domain, in Germany it focuses on the uniqueness, the irreplaceability of the individual subject and the duty to cultivate it by self-education (Bildung).
Author: Y. Malier
Publisher: CRC Press
ISBN: 1351440896
Category : Architecture
Languages : en
Pages : 570
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Book Description
Provides a thorough review of properties, durability and use of high performance concrete, derived from recent research and experience. This book contains contributions from the leading French, Canadian and Swiss researchers, designers and material specialists, translated into English for the first time.
