Download or read book Etude l chelle atomique de l implantation du fer dans le carbure de silicium SiC written by Lindor Diallo and published by . This book was released on 2019 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail de thèse porte sur l'étude du carbure de silicium, dopé avec du fer dans le but de réaliser un semi-conducteur magnétique dilué à température ambiante pour des applications à la spintronique. Le dopage en fer a été réalisé par implantation ionique de type multi-énergie (30 - 160 keV) à différentes fluences, conduisant à une concentration atomique constante de 2 % de 20 à 100 nm. Il a été suivi d'un recuit à haute température dans le but d'homogénéiser la concentration en dopants. Les implantations se sont déroulées à une température de 550 °C. L'optimisation des propriétés magnétiques et électroniques du SiC-Fe, de même que la compréhension des mécanismes physiques à l'origine du magnétisme induit, ont nécessité une caractérisation poussée de la microstructure des matériaux implantés. Les objectifs de ce travail ont été d'une part, de réaliser une étude à l'échelle atomique de la nanostructure en fonction des conditions d'implantations (température, fluence) et des traitements thermiques post-implantation, et d'autre part, de déterminer les propriétés magnétiques des matériaux implantés. Dans ce travail, nous avons montré par Sonde Atomique Tomographique, la présence de nanoparticules dont la taille moyenne augmente avec la température de recuit. La cartographie chimique des nanoparticules a permis de révéler l'existence de phases riches en Fe pour les échantillons recuits. L'étude magnétique (spectrométrie Mössbauer et Squid) a montré que la contribution ferromagnétique est due principalement aux nanoparticules magnétiques et/ ou aux atomes de fer magnétiques dilués dans la matrice. La corrélation entre les propriétés structurale et magnétique a permis de montrer que les atomes de fer dilués dans la matrice et substitués sur sites de silicium contribuent au signal ferromagnétique en dessous de 300 K. Nous avons donc montré dans ce travail, que la taille et la nature des phases présentes dans les nanoparticules dépendent des conditions d'implantation et des températures de recuit et qu'il est nécessaire de recuire les échantillons à haute température pour faire apparaître un ordre ferromagnétique.
Download or read book Applied Reactor Physics written by Alain Hébert and published by Presses inter Polytechnique. This book was released on 2009 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transport Theory written by James J. Duderstadt and published by John Wiley & Sons. This book was released on 1979 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: Problems after each chapter
Download or read book Nuclear Computational Science written by Yousry Azmy and published by Springer Science & Business Media. This book was released on 2010-04-15 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear engineering has undergone extensive progress over the years. In the past century, colossal developments have been made and with specific reference to the mathematical theory and computational science underlying this discipline, advances in areas such as high-order discretization methods, Krylov Methods and Iteration Acceleration have steadily grown. Nuclear Computational Science: A Century in Review addresses these topics and many more; topics which hold special ties to the first half of the century, and topics focused around the unique combination of nuclear engineering, computational science and mathematical theory. Comprising eight chapters, Nuclear Computational Science: A Century in Review incorporates a number of carefully selected issues representing a variety of problems, providing the reader with a wealth of information in both a clear and concise manner. The comprehensive nature of the coverage and the stature of the contributing authors combine to make this a unique landmark publication. Targeting the medium to advanced level academic, this book will appeal to researchers and students with an interest in the progression of mathematical theory and its application to nuclear computational science.
Download or read book The Physics of Nuclear Reactors written by Serge Marguet and published by Springer. This book was released on 2018-02-26 with total page 1462 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive volume offers readers a progressive and highly detailed introduction to the complex behavior of neutrons in general, and in the context of nuclear power generation. A compendium and handbook for nuclear engineers, a source of teaching material for academic lecturers as well as a graduate text for advanced students and other non-experts wishing to enter this field, it is based on the author’s teaching and research experience and his recognized expertise in nuclear safety. After recapping a number of points in nuclear physics, placing the theoretical notions in their historical context, the book successively reveals the latest quantitative theories concerning: • The slowing-down of neutrons in matter • The charged particles and electromagnetic rays • The calculation scheme, especially the simplification hypothesis • The concept of criticality based on chain reactions • The theory of homogeneous and heterogeneous reactors • The problem of self-shielding • The theory of the nuclear reflector, a subject largely ignored in literature • The computational methods in transport and diffusion theories Complemented by more than 400 bibliographical references, some of which are commented and annotated, and augmented by an appendix on the history of reactor physics at EDF (Electricité De France), this book is the most comprehensive and up-to-date introduction to and reference resource in neutronics and reactor theory.
Download or read book Reactor Dosimetry written by Harry Farrar and published by ASTM International. This book was released on 1994 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 8th ASTM-Euratom Symposium, held in Vail, Colorado, Aug.-Sept. 1993, to provide a forum for experts to discuss their latest results under the broad theme of dosimetry for the correlation of radiation effects. Preceded by a summary of the keynote presentations and followed by summa
Download or read book Nuclear Engineering Handbook written by Kenneth D. Kok and published by CRC Press. This book was released on 2016-10-03 with total page 1328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building upon the success of the first edition, the Nuclear Engineering Handbook, Second Edition, provides a comprehensive, up-to-date overview of nuclear power engineering. Consisting of chapters written by leading experts, this volume spans a wide range of topics in the areas of nuclear power reactor design and operation, nuclear fuel cycles, and radiation detection. Plant safety issues are addressed, and the economics of nuclear power generation in the 21st century are presented. The Second Edition also includes full coverage of Generation IV reactor designs, and new information on MRS technologies, small modular reactors, and fast reactors.
