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Author: OLIVIER.. RONSIN
Publisher:
ISBN:
Category :
Languages : fr
Pages : 203
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Book Description
CETTE THESE PRESENTE UNE ETUDE EXPERIMENTALE DE LA PROPAGATION DE FRACTURES DIRIGEES DANS DE MINCES PLAQUES DE VERRE, CONFIGURATION DANS LAQUELLE LA LOCALISATION DU FRONT DE FRACTURE PAR UN GRADIENT DE TEMPERATURE PERMET LE CONTROLE DE LA VITESSE DE PROPAGATION. SELON LA LARGEUR DE LA PLAQUE DE VERRE, CARACTERISANT LA QUANTITE D'ENERGIE ELASTIQUE DISPONIBLE DANS LE MILIEU, NOUS OBSERVONS DIFFERENTS REGIMES DE PROPAGATION. POUR DE FAIBLES LARGEURS, LA FRACTURE NE SE PROPAGE PAS ; AU DELA D'UNE LARGEUR SEUIL, LA PROPAGATION EST RECTILIGNE AU MILIEU DE LA PLAQUE ; ENFIN, APRES UNE DEUXIEME VALEUR SEUIL DE LA LARGEUR, LA FRACTURE SUIT UN CHEMIN OSCILLANT REGULIER, PUIS CHAOTIQUE. L'APPLICATION DU CRITERE DE GRIFFITH AU SEUIL DE PROPAGATION, PAR CONFRONTATION AVEC UN MODELE ELASTIQUE BIDIMENSIONNEL, DONNE ACCES A L'ENERGIE DE SURFACE DU VERRE, DONT LA VALEUR NE DEPEND PAS DE LA VITESSE DE PROPAGATION DANS LE DOMAINE ETUDIE. L'ETUDE DE LA TRANSITION DE LA PROPAGATION RECTILIGNE VERS LA PROPAGATION OSCILLANTE NOUS PERMET D'AFFIRMER QUE LE CRITERE DE STABILITE DE COTTERELL ET RICE NE S'APPLIQUE PAS ICI. ENFIN, NOUS ETUDIONS LA PROPAGATION DE PLUSIEURS FRACTURES EN INTERACTION ET NOUS MONTRONS QUE POUR UN SYSTEME DE SUFFISAMMENT GRANDE TAILLE, LA DISTANCE D'EQUILIBRE ENTRE LES FRACTURES EST UNE LONGUEUR INTRINSEQUE AU SYSTEME.
Author: OLIVIER.. RONSIN
Publisher:
ISBN:
Category :
Languages : fr
Pages : 203
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Book Description
CETTE THESE PRESENTE UNE ETUDE EXPERIMENTALE DE LA PROPAGATION DE FRACTURES DIRIGEES DANS DE MINCES PLAQUES DE VERRE, CONFIGURATION DANS LAQUELLE LA LOCALISATION DU FRONT DE FRACTURE PAR UN GRADIENT DE TEMPERATURE PERMET LE CONTROLE DE LA VITESSE DE PROPAGATION. SELON LA LARGEUR DE LA PLAQUE DE VERRE, CARACTERISANT LA QUANTITE D'ENERGIE ELASTIQUE DISPONIBLE DANS LE MILIEU, NOUS OBSERVONS DIFFERENTS REGIMES DE PROPAGATION. POUR DE FAIBLES LARGEURS, LA FRACTURE NE SE PROPAGE PAS ; AU DELA D'UNE LARGEUR SEUIL, LA PROPAGATION EST RECTILIGNE AU MILIEU DE LA PLAQUE ; ENFIN, APRES UNE DEUXIEME VALEUR SEUIL DE LA LARGEUR, LA FRACTURE SUIT UN CHEMIN OSCILLANT REGULIER, PUIS CHAOTIQUE. L'APPLICATION DU CRITERE DE GRIFFITH AU SEUIL DE PROPAGATION, PAR CONFRONTATION AVEC UN MODELE ELASTIQUE BIDIMENSIONNEL, DONNE ACCES A L'ENERGIE DE SURFACE DU VERRE, DONT LA VALEUR NE DEPEND PAS DE LA VITESSE DE PROPAGATION DANS LE DOMAINE ETUDIE. L'ETUDE DE LA TRANSITION DE LA PROPAGATION RECTILIGNE VERS LA PROPAGATION OSCILLANTE NOUS PERMET D'AFFIRMER QUE LE CRITERE DE STABILITE DE COTTERELL ET RICE NE S'APPLIQUE PAS ICI. ENFIN, NOUS ETUDIONS LA PROPAGATION DE PLUSIEURS FRACTURES EN INTERACTION ET NOUS MONTRONS QUE POUR UN SYSTEME DE SUFFISAMMENT GRANDE TAILLE, LA DISTANCE D'EQUILIBRE ENTRE LES FRACTURES EST UNE LONGUEUR INTRINSEQUE AU SYSTEME.
Author: KHEREDDINE.. GHALAYINI
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Author: Jean-Paul Sarda
Publisher:
ISBN:
Category :
Languages : fr
Pages : 202
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Author: Yannick Descantes
Publisher:
ISBN:
Category :
Languages : fr
Pages : 190
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Book Description
La maîtrise de la fracturation artificielle des roches est un enjeu économique essentiel pour le secteur des roches ornementales, les travaux publics et l'industrie pétrolière. Pour améliorer cette maîtrise, une étude des mécanismes de fracturation des roches par les techniques courantes de minage et de fracturation hydraulique est nécessaire. Ces techniques consistant à mettre en pression un fluide dans un forage éventuellement préfissuré, une analyse expérimentale ct théorique des mécanismes gouvernant l'initiation ct la propagation de fractures radiales autour d'un forage par injection contrôlée d'un fluide sous pression a donc été réalisée. Cette analyse procède par une revue bibliographique, par la mise au point et la réalisation d'essais de fracturation hydraulique contrôlée en laboratoire et par une étude théorique de l'influence d'un défaut de symétrie puis de l'anisotropie sur l'orientation des fractures. Malgré les symétries géométriques et de chargement des blocs, seul un faible débit d'injection a permis d'initier ct de propager une fracturation symétrique par rapport au forage. Un débit plus élevé a favorisé le développement uniforme d'une fracture selon l'axe du forage. Les fractures sont droites sur les faces des blocs, mais dévient légèrement du plan de symétrie censé les contenir. A débit fixé, les fractures se propagent à pression constante ou croissante. Le contrôle du débit d'injection a permis de maîtriser leur vitesse de propagation. La pression critique a été mesurée, ainsi que l'ouverture maximale de fracture à l'intérieur et en surface des blocs. L'étude théorique montre que ni un défaut de symétrie, ni la faible anisotropie mesurée n'expliquent, seuls, les légères déviations de fractures observées. Cependant, les résultats des calculs orthotropes ont une sensibilité aux variations des paramètres mécaniques de l'ordre des déviations observées. L'écart entre ces résultats et les déviations observées ne serait donc pas significatif.
Author: Hans K. Uhthoff
Publisher: Springer Science & Business Media
ISBN: 3642684483
Category : Medical
Languages : en
Pages : 433
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Book Description
External fixation is now being used widely to maintain fractures, osteo tomies, and arthrodeses in a desired position during consolidation. Whereas external fixation has been readily accepted in European countries, its use has weathered a rather stormy course in North America, especially in the treatment of fractures. Only recently has external fixation found its rightful place on this continent as well. Many different models are on the market today, and the practitioner is faced with a difficult decision in selecting a model. Should he buy a system where the fracture has to be reduced first, or should he work with a device permitting a reduction after insertion of the pins? To enable surgeons to study the different systems, to discuss their advantages and disadvantages, and to permit them to put their hands on these devices and inspect them personally, the Division of Orthopedic Surgery, University of Ottawa organized an applied basic science course in May 1981, External Fixation of Fractures. During this course, all major systems were pre sented to the participants. As happened during the course "Internal Fixation of Fractures" held two years ago, the rigidity of internal fixation was frequently and intensively debated. Whereas the rigidity of internal fixation cannot be altered during the course of healing, the rigidity of external fixation can be changed. In fact, with progression of union, rods of increasing elasticity can be used.
Author: Leslie Rainer
Publisher: Getty Publications
ISBN: 1606060430
Category : Architecture
Languages : fr
Pages : 438
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Book Description
Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.
Author: Sahra Gibbon
Publisher: Routledge
ISBN: 1134144725
Category : Health & Fitness
Languages : en
Pages : 387
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Book Description
Biosocialities, Genetics and the Social Sciences explores the social, cultural and economic transformations that result from innovations in genomic knowledge and technology. This pioneering collection uses Paul Rabinow’s concept of biosociality to chart the shifts in social relations and ideas about nature, biology and identity brought about by developments in biomedicine. Based on new empirical research, it contains chapters on genomic research into embryonic stem cell therapy, breast cancer, autism, Parkinson’s and IVF treatment, as well as on the expectations and education surrounding genomic research. It covers four main themes: novel modes of identity and identification, such as genetic citizenship the role of institutions, ranging from disease advocacy organizations and voluntary organizations to the state the production of biological knowledge, novel life-forms, and technologies the generation of wealth and commercial interests in biology. Including an afterword by Paul Rabinow and case studies on the UK, US, Canada, Germany, India and Israel, this book is key reading for students and researchers of the new genetics and the social sciences – particularly medical sociologists, medical anthropologists and those involved with science and technology studies.
Author: Carolyn Côté-Lussier
Publisher: University of Ottawa Press
ISBN: 0776628720
Category : Social Science
Languages : en
Pages : 396
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Book Description
Contemporary Criminological Issues tackles some of today’s most pressing social issues, from the criminalization of Indigenous peoples to interpersonal violence, border control, and armed conflicts. This book advances cutting-edge theories and methods, with the aim of moving beyond the scholarship that reproduces insecurity and exclusion. The breadth of approaches encompasses much of the current critical criminological scholarship, serving as a counterpoint to the growth of managerial and administrative criminologies and the rise of explicitly exclusionary and punitive state policies and practices with respect to ‘crime’ and ‘security.’ This edited collection featuring two books, one in English and one in French, includes important contributions to knowledge and public policy by eminent experts and emerging scholars. This book is published in English.
Author: A. Hunsicker
Publisher: Universal-Publishers
ISBN: 1612330355
Category : Political Science
Languages : en
Pages : 443
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Book Description
The worldwide number of incidents involving civil disturbances, public unrests, demonstrations, uprisings, and riots is increasing by the minute. Each incident presents an ever-demanding challenge for law enforcement and security professionals. A detailed and understandable manual for security enforcement and riot control professionals is a priority, and the answer to those challenging situations.Any professional actively, directly, or indirectly engaged in crowd control operations, vice or veteran, whether in a unit or as team leader, must train for and be able to pinpoint even the most unexpected security concerns. Behind the Shield contains carefully selected and illustrated material for the crowd control, law enforcement, and security professional. All of the available training and study material, individual case studies, and real scenarios, combined with professional experience, serve as the foundation for this specialist's manual. Comprehensive, detailed, and straightforward, Behind the Shield is the only book to offer an in-depth look into the operational aspects of crowd control operations. It guides the reader through a diversity of advanced disciplines and skills, and contains all the necessary ingredients for effective crowd control planning and operations.Information about every aspect of crowd control operations is t only an important part of the professional's ongoing training curriculum, but is also crucial for those officials who seek a professional operation and solution, facing t only today's security needs, but also those of the future.
Author: Grant LeMarquand
Publisher: African Books Collective
ISBN: 9966974261
Category : Education
Languages : en
Pages : 266
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Book Description
Part One addresses 'Theological Foundations.' The five essays in this section deal with the Bible, Theology and Ecumenism. The subjects of theological methods, contextual hermeneutics, and appropriate curriculum are given special attention. Of course even foundational issues cannot be discussed in a vacuum and so each of the essays addresses these foundational subjects in the light of African realities. Part Two deals with 'Contemporary Issues.' It is particularly in this section that the traditional themes in African theology have been somewhat displaced by concerns which are today very pressing indeed. Three essays are devoted to the question of HIV/AIDS. This disease, which has devastated the African continent, demands a theological and practical response from those who claim to follow Jesus Christ. If the churches do not respond to this crisis with energy and determination we should not be surprised if the next generation wonders whether the Gospel has the power which we claim that it has. Two essays address the question of Islam and Muslim-Christian Relations in Africa. The resurgence of Islam in the world today is a concern of many. For those who believe in Jesus, this is a challenge which demands much wisdom and love. How should we respond to our Muslim neighbours? What are appropriate and thoughtful ways to share the love of Christ? Two further essays appear under the title of 'The Marginalized.' This could, of course, be a much large section. Those who suffer from AIDS could be included in this number, and one might have expected to see at least one essay on the place of women. In this volume, however, the 'disabled' and youth are highlighted. Both groups are clearly in need of the attention of the churches, and both groups are clearly misunderstood and neglected. The final section of Part Two contains essays, which focus attention on 'Theological Paedagogy.' All of the other contributions to this volume make suggestions and arguments about curriculum, resources, and issues of concern for theological educators. The causal aim of this book is that these essays may help us to reflect in an intentional way on the implications of contemporary realities for the future of theological education.
