CONTRIBUTION A L'ETUDE DES METHODES DES EQUATIONS INTEGRALES ET A LEUR MISE EN UVRE NUMERIQUE EN ELASTOPLASTICITE PDF Download
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Author: BERTRAND.. BURGARDT
Publisher:
ISBN:
Category :
Languages : fr
Pages : 193
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Book Description
CETTE ETUDE TRAITE DES METHODES DES EQUATIONS INTEGRALES APPLIQUEES A LA RESOLUTION D'UN PROBLEME ELASTOPLASTIQUE SOUS L'HYPOTHESE DES PETITES PERTURBATIONS. L'INTRODUCTION DE L'IDENTITE DE SOMIGLIANA AVEC DEFORMATIONS INITIALES PERMET D'OBTENIR UNE FORMULATION DU PROBLEME DIRECTEMENT PILOTEE EN DEFORMATIONS OU EN CONTRAINTES DANS LA ZONE POTENTIELLEMENT PLASTIQUE, CE QUI CONSTITUE UNE DIFFERENCE FONDAMENTALE AVEC LES METHODES DES ELEMENTS FINIS DE DOMAINE. LA RESOLUTION NUMERIQUE DU SYSTEME NON-LINEAIRE EST REALISEE A L'AIDE DE DEUX METHODES DISTINCTES (COLLOCATION ET GALERKIN), POUR LESQUELLES LES CONDITIONS DE REGULARITES DES CHAMPS INCONNUS DIFFERENT. DANS LES DEUX CAS, L'INTEGRATION LOCALE DE LA LOI DE COMPORTEMENT EST EFFECTUEE AU MOYEN D'UN ALGORITHME DE TYPE RETOUR RADIAL ET LA NOTION D'OPERATEUR TANGENT COHERENT (CTO) EST INTRODUITE DANS LE SCHEMA ITERATIF DE NEWTON-RAPHSON. APRES AVOIR PRESENTE UNE METHODE SYSTEMATIQUE DE REGULARISATION DES OPERATEURS INTEGRAUX EN DES POINTS REGULIERS DE LA FRONTIERE, NOUS ETENDONS CES RESULTATS A DES GEOMETRIQUES SINGULIERES, CE QUI CONDUIT A UNE REPRESENTATION INTEGRALE ORIGINALE DES DEFORMATIONS EN TOUT POINT DU DOMAINE FERME. CETTE EXPRESSION DONNE LIEU A UNE METHODE DE COLLOCATION SIMPLE ET COHERENTE, RETABLISSANT EN OUTRE LA DUALITE ENTRE LES EQUATIONS INTEGRALES EN DEPLACEMENT ET EN VECTEUR-CONTRAINTE. NOUS MONTRONS EGALEMENT QUE LE SYSTEME D'EQUATIONS REGISSANT LE PROBLEME DERIVE DE LA STATIONNARITE D'UNE FONCTIONNELLE NE COMPORTANT QUE DES INTEGRALES REGULIERES ET ADMET UN OPERATEUR TANGENT GLOBAL SYMETRIQUE. LA MISE EN UVRE NUMERIQUE DE LA METHODE DE GALERKIN QUI EN RESULTE EST DECRITE ET NOUS PRESENTONS UNE REGLE DE QUADRATURE SIMPLE ET SYSTEMATIQUE DES INTEGRALES DOUBLES, CELLE-CI DEVANT NEANMOINS ETRE OPTIMISEE A LONG TERME. DES EXEMPLES NUMERIQUES PERMETTENT DE VALIDER LES FORMULATIONS ET LES ALGORITHMES PROPOSES.
Author: BERTRAND.. BURGARDT
Publisher:
ISBN:
Category :
Languages : fr
Pages : 193
Get Book Here
Book Description
CETTE ETUDE TRAITE DES METHODES DES EQUATIONS INTEGRALES APPLIQUEES A LA RESOLUTION D'UN PROBLEME ELASTOPLASTIQUE SOUS L'HYPOTHESE DES PETITES PERTURBATIONS. L'INTRODUCTION DE L'IDENTITE DE SOMIGLIANA AVEC DEFORMATIONS INITIALES PERMET D'OBTENIR UNE FORMULATION DU PROBLEME DIRECTEMENT PILOTEE EN DEFORMATIONS OU EN CONTRAINTES DANS LA ZONE POTENTIELLEMENT PLASTIQUE, CE QUI CONSTITUE UNE DIFFERENCE FONDAMENTALE AVEC LES METHODES DES ELEMENTS FINIS DE DOMAINE. LA RESOLUTION NUMERIQUE DU SYSTEME NON-LINEAIRE EST REALISEE A L'AIDE DE DEUX METHODES DISTINCTES (COLLOCATION ET GALERKIN), POUR LESQUELLES LES CONDITIONS DE REGULARITES DES CHAMPS INCONNUS DIFFERENT. DANS LES DEUX CAS, L'INTEGRATION LOCALE DE LA LOI DE COMPORTEMENT EST EFFECTUEE AU MOYEN D'UN ALGORITHME DE TYPE RETOUR RADIAL ET LA NOTION D'OPERATEUR TANGENT COHERENT (CTO) EST INTRODUITE DANS LE SCHEMA ITERATIF DE NEWTON-RAPHSON. APRES AVOIR PRESENTE UNE METHODE SYSTEMATIQUE DE REGULARISATION DES OPERATEURS INTEGRAUX EN DES POINTS REGULIERS DE LA FRONTIERE, NOUS ETENDONS CES RESULTATS A DES GEOMETRIQUES SINGULIERES, CE QUI CONDUIT A UNE REPRESENTATION INTEGRALE ORIGINALE DES DEFORMATIONS EN TOUT POINT DU DOMAINE FERME. CETTE EXPRESSION DONNE LIEU A UNE METHODE DE COLLOCATION SIMPLE ET COHERENTE, RETABLISSANT EN OUTRE LA DUALITE ENTRE LES EQUATIONS INTEGRALES EN DEPLACEMENT ET EN VECTEUR-CONTRAINTE. NOUS MONTRONS EGALEMENT QUE LE SYSTEME D'EQUATIONS REGISSANT LE PROBLEME DERIVE DE LA STATIONNARITE D'UNE FONCTIONNELLE NE COMPORTANT QUE DES INTEGRALES REGULIERES ET ADMET UN OPERATEUR TANGENT GLOBAL SYMETRIQUE. LA MISE EN UVRE NUMERIQUE DE LA METHODE DE GALERKIN QUI EN RESULTE EST DECRITE ET NOUS PRESENTONS UNE REGLE DE QUADRATURE SIMPLE ET SYSTEMATIQUE DES INTEGRALES DOUBLES, CELLE-CI DEVANT NEANMOINS ETRE OPTIMISEE A LONG TERME. DES EXEMPLES NUMERIQUES PERMETTENT DE VALIDER LES FORMULATIONS ET LES ALGORITHMES PROPOSES.
Author: Don Montague
Publisher: Taylor & Francis
ISBN: 9780419199106
Category : Architecture
Languages : en
Pages : 472
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Book Description
This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Author: Jacqueline Ki-Zerbo
Publisher: Univ of California Press
ISBN: 9780520066960
Category : History
Languages : en
Pages : 372
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Book Description
"This volume covers the period from the end of the Neolithic era to the beginning of the seventh century of our era. This lengthy period includes the civilization of Ancient Egypt, the history of Nubia, Ethiopia, North Africa and the Sahara, as well as of the other regions of the continent and its islands."--Publisher's description
Author: Olivier Ouari
Publisher: Royal Society of Chemistry
ISBN: 1788019660
Category : Science
Languages : en
Pages : 611
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Book Description
Nitroxides are versatile small organic molecules possessing a stabilised free radical. With their unpaired electron spin they display a unique reactivity towards various environmental factors, enabling a diverse range of applications. They have uses as synthetic tools, such as catalysts or building blocks; imaging agents and probes in biomedicine and materials science; for medicinal antioxidant applications; and in energy storage. Polynitroxides (polymers bearing pendant nitroxide sidechains) have been used in organic radical batteries, oxidation catalysts and in exchange reactions for constructing complex architectures. Chapters in this book cover the synthesis of nitroxides, EPR studies and magnetic resonance applications, physiochemical studies, and applications including in batteries, imaging and organic synthesis. With contributions from leaders in the field, Nitroxides will be of interest to graduate students and researchers across chemistry, physics, biology and materials science.
Author: Nickolai Kocherginsky
Publisher: CRC Press
ISBN: 9780849342042
Category : Science
Languages : en
Pages : 286
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Book Description
Extending the use of nitroxides as probes into more complex systems such as viable cells and whole animals requires greater knowledge of their interactions in functioning biological systems and appropriate model systems. Nitroxide Spin Labels: Reactions in Biology and Chemistry presents information essential for research in this area. Nitroxide research offers the promise of important new ways of measuring metabolism and will be useful in the diagnosis of important disease categories such as cancer, inflammation, and ischemia.
Author: W. Petruk
Publisher: Elsevier
ISBN: 0080527337
Category : Technology & Engineering
Languages : en
Pages : 287
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Book Description
Techniques of performing applied mineralogy investigations, and applications and capabilities of recently developed instruments for measuring mineral properties are explored in this book intended for practicing applied mineralogists, students in mineralogy and metallurgy, and mineral processing engineers. The benefits of applied mineralogy are presented by using in-depth applied mineralogy studies on base metal ores, gold ores, porphyry copper ores, iron ores and industrial minerals as examples. The chapter on base metal ores includes a discussion on the effects of liberation, particle sizes and surfaces coatings of Pb, Cu, Fe, Ca and So4- on the recoveries of sphalerite, galena and chalcopyrite. The chapter on gold discusses various methods of determining the quantities of gold in different minerals, including 'invisible' gold in pyrite and arsenopyrite, so that a balance of the distribution of gold among the minerals can be calculated. This book also discusses the roles of pyrite, oxygen, moisture and bacterial (thiobacillus ferrooxidans) on reactions that produce acidic drainage from tailings piles, and summarizes currently used and proposed methods of remediation of acidic drainage.
Author: H. Fischer
Publisher: Springer
ISBN: 9783540033462
Category : Science
Languages : en
Pages : 0
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Book Description
Author: Jean Daillant
Publisher: Springer Science & Business Media
ISBN: 3540486968
Category : Science
Languages : en
Pages : 347
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Book Description
The reflection of and neutrons from surfaces has existed as an x-rays exp- imental for almost it is in the last technique fifty Nevertheless, only years. decade that these methods have become as of enormously popular probes This the surfaces and interfaces. to be due to of several appears convergence of intense different circumstances. These include the more n- availability be measured orders tron and sources that can over (so reflectivity x-ray many of and the much weaker surface diffuse can now also be magnitude scattering of thin films and studied in some the detail); growing importance multil- basic the realization of the ers in both and technology research; important which in the of surfaces and and role roughness plays properties interfaces; the of statistical models to characterize the of finally development topology its and its characterization from on roughness, dependence growth processes The of and to surface scattering experiments. ability x-rays neutro4s study four five orders of in scale of surfaces over to magnitude length regardless their and also their to ability probe environment, temperature, pressure, etc. , makes these the choice for buried interfaces often probes preferred obtaining information about the microstructure of often in statistical a global surfaces, the local This is manner to complementary imaging microscopy techniques, of such studies in the literature witnessed the veritable by explosion published the last few Thus these lectures will useful for over a resource years.
Author: Gábor Földiák
Publisher:
ISBN: 9780444416995
Category :
Languages : en
Pages : 564
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Book Description
Author: John Coleman De Graft-Johnson
Publisher: Black Classic Press
ISBN: 9780933121034
Category : Social Science
Languages : en
Pages : 240
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Book Description
First published in 1954, a time when few books on African history were written from an African perspective. An intimate history of Africa and its ancient civilizations, the book opposed the stereotyped and often racist histories of Africa. Today, a half century after its initial publication, African Glory still provides a vivid and dynamic connection to the African past.
