Download or read book tude par simulation num rique du dommage d irradiation dans les alliages fer cuivre written by Jean-Christophe Turbatte and published by . This book was released on 1997 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les aciers de cuve des reacteurs nucleaires se fragilisent sous l'effet de l'irradiation neutronique. Afin de comprendre l'origine du phenomene de nombreuses etudes experimentales ont ete menees pour caracteriser le dommage d'irradiation dans ces aciers. Quatre defauts ont ainsi ete identifies : des amas de defauts ponctuels, des complexes cuivre-lacunes, des atmospheres d'atomes de cuivre et des precipites tres riches en cuivre. Les travaux experimentaux n'ont cependant pas permis de caracteriser la structure de ces defauts et de comprendre les mecanismes a l'origine de leur formation. Afin d'apporter des elements de reponses sur ces points, nous avons entrepris un travail de simulation numerique (dynamique moleculaire et monte carlo). Les simulations ont ete effectuees dans du fer pur et des alliages binaires de type fer-cuivre. A cette fin, nous avons notamment adapte un potentiel interatomique utilise pour decrire le fer pur et construit un potentiel capable de reproduire les interactions entre les atomes de cuivre et fer. Le travail effectue a notamment permis de confirmer l'existence des quatre types de defauts pris en compte, de caracteriser leur structure et de cerner les conditions favorisant leur formation : - les amas d'atomes de solute contiennent une quantite importante de lacunes et se forment dans le cur des cascades de deplacements produites par des pka ayant une energie superieure a 15kev. - les precipites riches en cuivre n'apparaissent que dans des alliages ayant une teneur en cuivre superieure a environ 0,1%. Leur formation resulte d'un phenomene de precipitation acceleree par l'irradiation. - les complexes cuivre-lacunes peuvent etre decrits comme etant un amas de quatre lacunes accroche a un atome de cuivre. - une partie des amas de defauts ponctuels se forment dans le cur des cascades de deplacements. Les autres resultent de l'agglomeration par diffusion des defauts libres.

Download or read book Etude par r sistivit lectronique des d fauts d irradiation dans les alliages or cuivre written by Ana Alamo and published by . This book was released on 1983 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Etude des d fauts cr s par irradiation lectronique dans les alliages de fer carbone dilu s written by Jean-Luc Leveque and published by . This book was released on 1969 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ETUDE PAR RESISTIVITE ELECTRIQUE DES DEFAUTS D IRRADIATION DANS LES ALLIAGES OR CUIVRE written by ANA.. ALAMO and published by . This book was released on 1983 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE DE LA PRODUCTION DE DEFAUTS PONCTUELS A 20 K DANS LES ALLIAGES CU::(3)AU ET CUAU ORDONNES ET DESORDONNES EN FONCTION DE L'ENERGIE DES ELECTRONS INCIDENTS COMPRISE ENTRE 0,4 ET 2,5 MEV. ON ANALYSE LES COURBES DE PRODUCTION A L'AIDE D'UN MODELE DE DEPLACEMENT DEVELOPPE POUR LES MATERIAUX DIATOMIQUES. ON A PU AINSI SEPARER LES ENERGIES DE SEUIL DE DEPLACEMENT POUR CHAQUE ESPECE ATOMIQUE (AU ET CU). ON A PU PRECISER PAR DES RECUITS ISOCHRONES LE MECANISME DE MIGRATION DES INTERSTITIELS DANS LES ALLIAGES ORDONNES. DANS LE CAS DES ALLIAGES DESORDONNES, LA MIGRATION DE L'INTERSTITIEL EST FORTEMENT RALENTIE. LA MIGRATION DES LACUNES, RESPONSABLE D'UNE AUGMENTATION DE L'ETAT D'ORDRE EST OBSERVEE LORS DES RECUITS A DES TEMPERATURES SUPERIEURES A 300 K DANS LES ALLIAGES ORDONNES ET DESORDONNES. ETUDE DES MODIFICATIONS DE L'ETAT D'ORDRE LORS D'IRRADIATION AUX NEUTRONS RAPIDES A 20 K

Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Satellite Situation Report written by Goddard Space Flight Center. Office of Public Affairs and published by . This book was released on 1977 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Historical Dictionary of Iran written by John Henry Lorentz and published by Historical Dictionaries of Asia, Oceania, and the Middle East. This book was released on 2007 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an overview of specific events, movements, people, political and social groups, places, trends, and chronology. Allows for considerable exploration of a number of historical and contemporary topics and issues. The modern period, defined as 1800-present, is covered extensively.

Download or read book New Nuclear Data written by and published by . This book was released on 1957 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metamorphoses written by Emanuele Coccia and published by John Wiley & Sons. This book was released on 2021-06-09 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: We are all fascinated by the mystery of metamorphosis – of the caterpillar that transforms itself into a butterfly. Their bodies have almost nothing in common. They don’t share the same world: one crawls on the ground and the other flutters its wings in the air. And yet they are one and the same life. Emanuele Coccia argues that metamorphosis – the phenomenon that allows the same life to subsist in disparate bodies – is the relationship that binds all species together and unites the living with the non-living. Bacteria, viruses, fungi, plants, animals: they are all one and the same life. Each species, including the human species, is the metamorphosis of all those that preceded it – the same life, cobbling together a new body and a new form in order to exist differently. And there is no opposition between the living and the non-living: life is always the reincarnation of the non-living, a carnival of the telluric substance of a planet – the Earth – that continually draws new faces and new ways of being out of even the smallest particle of its disparate body. By highlighting what joins humans together with other forms of life, Coccia’s brilliant reflection on metamorphosis encourages us to abandon our view of the human species as static and independent and to recognize instead that we are part of a much larger and interconnected form of life.

Download or read book Space Debris written by Heiner Klinkrad and published by Springer Science & Business Media. This book was released on 2006-09-01 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: The future evolution of the debris environment will be forecast on the basis of traffic models and possible hazard mitigation practices. The text shows how large trackable objects will have re-entry pinpointed and predictions made on related risk assessment for possible ground impact. Models will also be described for meteoroids which are also a prevailing risk.

Download or read book Science Government and Information written by United States. President's Science Advisory Committee and published by . This book was released on 1963 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dictionary of Technical Terms for Aerospace Use written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and published by . This book was released on 1965 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Brief definitions "intended to be as clear as possible to the non-expert, but accuracy has not been compromised for the sake of readability. Mathematics has been used where necessary to avoid ambiguity."--Intro. Published 1965.

Download or read book Lessons from Amazonia written by Richard O. Bierregaard and published by Yale University Press. This book was released on 2001-12-11 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deforestation is occurring at an alarming rate in many parts of the world, causing destruction of natural habitat and fragmentation of what remains. Nowhere is this problem more pressing than in the Amazon rainforest, which is rapidly vanishing in the face of enormous pressure from humans to exploit it. This book presents the results of the longest-running and most comprehensive study of forest fragmentation ever undertaken, the Biological Dynamics of Forest Fragments Project (BDFFP) in central Amazonia, the only experimental study of tropical forest fragmentation in which baseline data are available before isolation from continuous forest took place.A joint project of Brazil’s National Institute for Research in Amazonia and the U.S. Smithsonian Institution, the BDFFP has investigated the many effects that habitat fragmentation has on plants, invertebrates, and vertebrates. The book provides an overview of the BDFFP, reports on its case studies, looks at forest ecology and tree genetics, and considers what issues are involved in establishing conservation and management guidelines.

Download or read book Edible Caterpillars and Their Food Plants in Bas Congo written by Paul Latham and published by . This book was released on 2003 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Historical Dictionary of Pakistan written by Shahid Javed Burki and published by . This book was released on 1999 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pakistan is unlike most other countries in the emerging world. It is one of the two nations – the other being the state of Israel – founded on the basis of religion. Although it was created to provide a homeland for the Muslim community of British India, in its original form it was able to accommodate only about half of the people of Islamic faith who lived in the subcontinent. Pakistan’s birth in 1947 resulted in one of the largest movements of people in human history when some 14 million people left their homes, with 8 million Muslims leaving India for what is now Pakistan and 6 million Hindus and Sikhs moving in the opposite direction. This was the first large-scale incidence of ethnic cleansing the world was to witness. --

Download or read book Fission Product Yields written by Katharine Way and published by . This book was released on 1950 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Open Work written by Umberto Eco and published by Harvard University Press. This book was released on 1989 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is significant for its concept of "openness"--the artist's decision to leave arrangements of some constituents of a work to the public or to chance--and for its anticipation of two themes of literary theory: the element of multiplicity and plurality in art, and the insistence on literary response as an interaction between reader and text.