Download or read book ETUDE EXPERIMENTALE DE LA PROPAGATION DE FRACTURES DIRIGEES MILIEU FRAGILE written by OLIVIER.. RONSIN and published by . This book was released on 1996 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book CONTRIBUTION A L ETUDE EXPERIMENTALE DE LA TRAJECTOIRE ET DE LA CINETIQUE DE PROPAGATION DES FISSURES BRANCHEES EN MILIEU FRAGILE written by KHEREDDINE.. GHALAYINI and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fractures hydrauliques written by Jean-Paul Sarda and published by . This book was released on 1986 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Etude exp rimentale et th orique des m canismes gouvernant l initiation et la propagation contr l es de fractures dans le granite de Vire par injection quasi statique d eau written by Yannick Descantes and published by . This book was released on 1998 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Current Concepts of External Fixation of Fractures written by Hans K. Uhthoff and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Terra 2008 written by Leslie Rainer and published by Getty Publications. This book was released on 2011-06-14 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Biosocialities Genetics and the Social Sciences written by Sahra Gibbon and published by Routledge. This book was released on 2007-07-20 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Contemporary Criminological Issues written by Carolyn Côté-Lussier and published by University of Ottawa Press. This book was released on 2020-05-05 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Behind the Shield written by A. Hunsicker and published by Universal-Publishers. This book was released on 2011 with total page 443 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Theological Education in Contemporary Africa written by Grant LeMarquand and published by African Books Collective. This book was released on 2004 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Interculturalism at the crossroads written by Mansouri, Fethi and published by UNESCO Publishing. This book was released on 2017-05-08 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nanocellulose written by Jin Huang and published by John Wiley & Sons. This book was released on 2019-08-05 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensively introduces readers to the production, modifications, and applications of nanocellulose This book gives a thorough introduction to the structure, properties, surface modification, theory, mechanism of composites, and functional materials derived from nanocellulose. It also provides in-depth descriptions of plastics, composites, and functional nanomaterials specifically derived from cellulose nanocrystals, cellulose nanofibrils, and bacterial cellulose. It includes the most recent progress in developing a conceptual framework of nanocellulose, as well as its numerous applications in the design and manufacture of nanocomposites and functional nanomaterials. The book also looks at the relationship between structure and properties. Featuring contributions from many noted experts in the field, Nanocellulose: From Fundamentals to Advanced Materials examines the current status of nanocomposites based on nanocelluloses. It covers surface modification of nanocellulose in the nanocomposites development; reinforcing mechanism of cellulose nanocrystals in nanocomposites; and advanced materials based on self-organization of cellulose nanocrystals. The book studies the role of cellulose nanofibrils in nanocomposites, as well as a potential application based on colloidal properties of cellulose nanocrystals. It also offers strategies to explore biomedical applications of nanocellulose. Provides comprehensive knowledge on the topic of nanocellulose, including the preparation, structure, properties, surface modification and strategy Covers new reports on the application of nanocellulose Summarizes three kinds of nanocellulose (cellulose nanocrystals, cellulose nanofibrils, and bacterial cellulose) and their production, modification, and applications Nanocellulose: From Fundamentals to Advanced Materials is a useful resource for specialist researchers of chemistry, materials, and nanotechnology science, as well as for researchers and students of the subject.

Download or read book Introduction to Forestry and Natural Resources written by Donald L. Grebner and published by Academic Press. This book was released on 2021-01-19 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to Forestry and Natural Resources, Second Edition, presents a broad, completely updated overview of the profession of forestry. The book details several key fields within forestry, including forest management, economics, policy, utilization and forestry careers. Chapters deal specifically with forest regions of the world, landowners, forest products, wildlife habitats, tree anatomy and physiology, and forest disturbances and health. These topics are ideal for undergraduate introductory courses and include numerous examples and questions for students to ponder. There is also a section dedicated to forestry careers. Unlike other introductory forestry texts, which focus largely on forest ecology rather than practical forestry concepts, this book encompasses the economic, ecological and social aspects, thus providing a uniquely balanced text. The wide range of experience of the contributing authors equips them especially well to identify missing content from other texts in the area and address topics currently covered in corresponding college courses. - Covers the application of forestry and natural resources around the world with a focus on practical applications and graphical examples - Describes basic techniques for measuring and evaluating forest resources and natural resources, including fundamental terminology and concepts - Includes management policies and their influence at the local, national and international levels

Download or read book The Boundaries of the West African Craton written by Nasser Ennih and published by Geological Society of London. This book was released on 2008 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Remote Sensing in Hydrology and Water Management written by Gert A. Schultz and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides comprehensive information on possible applications of remote sensing data for hydrological monitoring and modelling as well as for water management decisions. Mathematical theory is provided only as far as it is necessary for understanding the underlying principles. The book is especially timely because of new programs and sensors that are or will be realised. ESA, NASA, NASDA as well as the Indian and the Brazilian Space Agency have recently launched satellites or developed plans for new sensor systems that will be especially pertinent to hydrology and water management. New techniques are presented whose structure differ from conventional hydrological models due to the nature of remotely sensed data.

Download or read book Dynamic Behavior of Materials Volume 1 written by Bo Song and published by Springer. This book was released on 2015-10-23 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic Behavior of Materials, Volume 1 represents the first of nine volumes of technical papers presented at the Society for Experimental Mechanics SEM 15th International Congress & Exposition on Experimental and Applied Mechanics, held at Costa Mesa, California, June 8-11, 2015. The full set of proceedings also includes volumes on: Challenges in Mechanics of Time Dependent Materials, Advancement of Optical Methods in Experimental Mechanics, Experimental and Applied Mechanics 16th International Symposium on MEMS and Nanotechnology, 5th International Symposium on the Mechanics of Biological Systems and Materials, International Symposium on the Mechanics of Composite and Multi-functional Materials, Fracture, Fatigue, Failure and Damage Evolution; and Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems.

Download or read book Handbook of Theological Education in Africa written by Isabel Apawo Phiri and published by Regnum Studies in Global Chris. This book was released on 2015-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Handbook of Theological Education in Africa is a fascinating witness to the explosive status quo of Theological Education. The historical and regional (inter alia) surveys open our eyes and ears to see and hear how fast it has taken root historically, geographically, and ecumenically. The landscape of African Theological Education has changed drastically during the final twenty to thirty years of the last century. There is very much to appreciate about it and what has been achieved. We have grounds to make us rejoice, and for which to thank the Lord. John Mbiti, Theologian and Philosopher, former Director of Bossey Ecumenical Institute The Handbook of Theological Education in Africa is unique, comprehensive and ambitious in its aim and scope. It is: - truly interdenominationally oriented, bringing perspectives from all major Christian traditions on the African continent - broad in geographical extension, collecting voices from all major regions of the vast African continent - life-centered and ecological in orientation, as voices are brought together on an impressive number of new key themes and contextual challenges for theological education in Africa - grounded in expertise, drawing on a pan-African unprecedented gathering of leading African theologians, men and women. We hope that this book, in its print and later digital versions, will make its way into the hands of African theological educators, will inspire students and will be a standard reference volume in all major African theological libraries, in both universities and church-related seminaries. Olav Fykse Tveit, WCC General Secretary The challenges of inclusiveness in African theological education are before us. The challenge to be ecumenical, meaning all Christians together; inclusiveness as serving a multi-religious continent with its islands is before ecumenical theological education. The challenges in terms of responding theologically to the issues that confront Africa - all of Africa - the religious, political, social, cultural issues and the challenges of people's spirituality and identity are to be on the radar of ecumenical theological education if theology is to be relevant in Africa. This Handbook of Theological Education in Africa has something for everybody. Mercy Oduyoye, Director of Institute of Women in Religion and Culture in Accra, Ghana This Handbook of Theological Education in Africa is a wake-up call for African churches to give proper prominence to theological education institutions and their programmes which serve them. We congratulate the editorial team for their magnificent work in bringing this Handbook together. This is a timely gift of the Church in Africa to the worldwide Church and will serve many generations of African theologians to come. Andre Karamaga, AACC General Secretary