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Book Description
Les propriétés intrinsèques de la fibre optique utilisée comme milieu à gain en font un candidat idéal pour le développement de sources laser de haute puissance, aujourd’hui capable de rivaliser avec les lasers à état solide, tout en apportant ses avantages propres : robustesse, efficacité, qualité de faisceau potentielle, gestion de la thermique, compacité et tenue à l’environnement. Les domaines d’application sont nombreux : industrie ( usinage, marquage), défense ( télémétrie, imagerie), environnement (lidar), communications en espace libre, recherche fondamentale...Cependant, certaines applications nécessitent des puissances ou énergie encore supérieures à ce que peut délivrer une seule fibre associée à une bonne qualité de faisceau. Pour contourner cette difficulté, l’approche abordée ici est de répartir l’amplification sur plusieurs fibres lasers, puis de recombiner les faisceaux en espace libre. Ce travail est préparatoire à une nouvelle génération de lasers hyper-intenses et a été réalisé dans le cadre du projet ANR CAN, collaboration entre LOA,IOGS ,Thales R&T et Onera. Suivant le dimensionnement défini par l’étude théorique de la combinaison cohérente de faisceaux laser, un toron de 64 fibres collimatées chacune par une petite lentille est conçu puis réalisé technologiquement. Par extension de l’idée de l’interféromètre à décalage quadri-latéral, une méthode de mesure collective et auto-référencée de la phase des fibres mise au point. Enfin, une technique originale et auto-adaptative de mise en phase par holographie numérique est présentée et validée expérimentalement.
Book Description
Les propriétés intrinsèques de la fibre optique utilisée comme milieu à gain en font un candidat idéal pour le développement de sources laser de haute puissance, aujourd’hui capable de rivaliser avec les lasers à état solide, tout en apportant ses avantages propres : robustesse, efficacité, qualité de faisceau potentielle, gestion de la thermique, compacité et tenue à l’environnement. Les domaines d’application sont nombreux : industrie ( usinage, marquage), défense ( télémétrie, imagerie), environnement (lidar), communications en espace libre, recherche fondamentale...Cependant, certaines applications nécessitent des puissances ou énergie encore supérieures à ce que peut délivrer une seule fibre associée à une bonne qualité de faisceau. Pour contourner cette difficulté, l’approche abordée ici est de répartir l’amplification sur plusieurs fibres lasers, puis de recombiner les faisceaux en espace libre. Ce travail est préparatoire à une nouvelle génération de lasers hyper-intenses et a été réalisé dans le cadre du projet ANR CAN, collaboration entre LOA,IOGS ,Thales R&T et Onera. Suivant le dimensionnement défini par l’étude théorique de la combinaison cohérente de faisceaux laser, un toron de 64 fibres collimatées chacune par une petite lentille est conçu puis réalisé technologiquement. Par extension de l’idée de l’interféromètre à décalage quadri-latéral, une méthode de mesure collective et auto-référencée de la phase des fibres mise au point. Enfin, une technique originale et auto-adaptative de mise en phase par holographie numérique est présentée et validée expérimentalement.
Author: Craig Dworkin Publisher: Northwestern University Press ISBN: 0810127113 Category : Art Languages : en Pages : 657
Book Description
Charles Bernstein has described conceptual "poetry pregnant with thought." Against Expression, the premier anthology of conceptual writing, presents work that is by turns thoughtful, funny, provocative, and disturbing. Editors Craig Dworkin and Kenneth Goldsmith chart the trajectory of the conceptual aesthetic from early precursors such as Samuel Beckett and Marcel Duchamp through major avant-garde groups of the past century, including Dada, Oulipo, Fluxus, and language poetry, to name just a few. The works of more than a hundred writers from Aasprong to Zykov demonstrate a remarkable variety of new ways of thinking about the nature of texts, information, and art, using found, appropriated, and randomly generated texts to explore the possibilities of non-expressive language. --Book Jacket.
Author: Sevil Acar Publisher: Academic Press ISBN: 0128135204 Category : Business & Economics Languages : en Pages : 156
Book Description
Macroeconomics of Climate Change in a Dualistic Economy: A Regional General Equilibrium Analysis generates significant, genuinely novel insights about dual economies and sustainable economic growth. These insights are generalize-able and applicable worldwide. The authors overcome existing limitations in general equilibrium modeling. By concentrating on tensions between green growth and dualism, they consider the global efforts against climate change and opposition by specific countries based on economic development needs. Using Turkey as their primary example, they address these two most discussed and difficult issues related to policy setting, blazing a path for those seeking an applied economic research framework to study such economic considerations. - Couples a CGE climate change mitigation policy analysis with a dual economy approach - Presents methods to model and assess policy instruments for mitigating climate change - Provides data sets and models on a freely-accessible companion website - Offers a path for those seeking an applied economic research framework to study economic considerations
Author: Chretien de Troyes Publisher: Yale University Press ISBN: 0300038380 Category : Poetry Languages : en Pages : 244
Book Description
A twelfth-century poem by the creator of the Arthurian romance describes the courageous exploits and triumphs of a brave lord who tries to win back his deserted wife's love
Author: Sampson Ejike Odum Publisher: iUniverse ISBN: 1663205043 Category : Fiction Languages : en Pages : 123
Book Description
‘KUMBA AFRICA’, is a compilation of African Short Stories written as fiction by Sampson Ejike Odum, nostalgically taking our memory back several thousands of years ago in Africa, reminding us about our past heritage. It digs deep into the traditional life style of the Africans of old, their beliefs, their leadership, their courage, their culture, their wars, their defeat and their victories long before the emergence of the white man on the soil of Africa. As a talented writer of rich resource and superior creativity, armed with in-depth knowledge of different cultures and traditions in Africa, the Author throws light on the rich cultural heritage of the people of Africa when civilization was yet unknown to the people. The book reminds the readers that the Africans of old kept their pride and still enjoyed their own lives. They celebrated victories when wars were won, enjoyed their New yam festivals and villages engaged themselves in seasonal wrestling contest etc; Early morning during harmattan season, they gathered firewood and made fire inside their small huts to hit up their bodies from the chilling cold of the harmattan. That was the Africa of old we will always remember. In Africa today, the story have changed. The people now enjoy civilized cultures made possible by the influence of the white man through his scientific and technological process. Yet there are some uncivilized places in Africa whose people haven’t tested or felt the impact of civilization. These people still maintain their ancient traditions and culture. In everything, we believe that days when people paraded barefooted in Africa to the swarmp to tap palm wine and fetch firewood from there farms are almost fading away. The huts are now gradually been replaced with houses built of blocks and beautiful roofs. Thanks to modern civilization. Donkeys and camels are no longer used for carrying heavy loads for merchants. They are now been replaced by heavy trucks and lorries. African traditional methods of healing are now been substituted by hospitals. In all these, I will always love and remember Africa, the home of my birth and must respect her cultures and traditions as an AFRICAN AUTHOR.
Author: David Ward Publisher: Fairleigh Dickinson Univ Press ISBN: 9780838636763 Category : History Languages : en Pages : 260
Book Description
This book is an in-depth analysis of three of the most crucial years in twentieth-century Italian history, the years 1943-46. After more than two decades of a Fascist regime and a disastrous war experience during which Italy changed sides, these years saw the laying of the political and cultural foundations for what has since become known as Italy's First Republic. Drawing on texts from the literature, film, journalism, and political debate of the period, Antifascisms offers a thorough survey of the personalities and positions that informed the decisions taken in this crucial phase of modern Italian history.
Author: Cindy Bellanger
Author: Cindy Bellanger
Author: Craig Dworkin
Author: Philostratus (the Athenian)
Author: Rigby
Author: Sevil Acar
Author: Alessandra Ceretto
Author: Chretien de Troyes
Author: Frances Harrison Marr
Author: Sampson Ejike Odum
Author: David Ward