Download or read book Etude r alisation et applications d un spectrom tre de R M N en champ faible written by Fernand Deigat and published by . This book was released on 1970 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book tude et r alisation d un dispositif de r sonance magn tique nucl aire bas champ magn tique en environnement ouvert et bruyant written by Nazim Lechéa and published by . This book was released on 2013 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail porte sur l'étude et la réalisation d'un dispositif de Résonance Magnétique Nucléaire (RMN) sous faibles champs magnétiques dans un environnement non blindé. Il se situe dans le cadre de la physique instrumentale avec pour application l'étude des matériaux par spectroscopie, l'imagerie médicale et l'aide au diagnostic. La RMN est une technique puissante permettant de sonder le cœur de la matière et d'étudier sa structure et ses propriétés moléculaires de façon non destructive et non invasive. Durant ce travail, un dispositif de RMN à bas champ a été étudié et réalisé. Effectuer des mesures à bas champ magnétique permet d'utiliser des aimants plus simples, moins coûteux et de limiter les courants de Foucault dans les matériaux conducteurs. Cependant, à bas champ magnétique, les signaux sont très faibles en raison de la forte dépendance du signal de RMN à l'intensité du champ magnétique lorsqu'une détection par induction magnétique est utilisée. Pour réduire cette dépendance, un SQUID fonctionnant à basse température critique a été utilisé afin d'obtenir une meilleure détection des signaux. Le SQUID a été combiné avec différents types de gradiomètres dont l'objet est de favoriser le signal provenant de l'échantillon par rapport aux signaux produits par des sources parasites lointaines. Il a été démontré qu'une configuration planaire est plus avantageuse qu'une configuration axiale en utilisant une approche analytique basée sur le principe de réciprocité. La chaîne de mesure comprend également un interrupteur supraconducteur astucieux développé dans le cadre de cette thèse. Il sert à protéger le SQUID pendant la phase de magnétisation de l'échantillon et permet d’éviter un temps mort pendant la phase d'acquisition de signal. La technique employée permet de piloter précisément toutes les phases de la mesure sans apporter significativement du bruit. Le dispositif expérimental final a permis de mesurer des signaux de RMN émanant d'un échantillon d'eau dans un environnement totalement ouvert, sujet à différents types de bruits basse fréquence (50 Hz et ses harmoniques, transformateurs, voiture en mouvements, ascenseurs...). Pour cela, une électronique de mesure généraliste contrôlant les différentes séquences de RMN a été réalisée et des méthodes de traitement de signaux analogiques et numériques ont été utilisées. Les protons d'hydrogène sont pré-polarisés dans un champ moyen de l'ordre de 100 mT et leur relaxation est mesurée en champ faible d'environ 50 μT en présence du champ terrestre à des fréquences de quelques kilohertz
Download or read book Government Reports Annual Index written by and published by . This book was released on 1994 with total page 1190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Download or read book Artificial Intelligence in Society written by OECD and published by OECD Publishing. This book was released on 2019-06-11 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The artificial intelligence (AI) landscape has evolved significantly from 1950 when Alan Turing first posed the question of whether machines can think. Today, AI is transforming societies and economies. It promises to generate productivity gains, improve well-being and help address global challenges, such as climate change, resource scarcity and health crises.
Download or read book Introduction to Modular Forms written by Serge Lang and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the reviews: "This book gives a thorough introduction to several theories that are fundamental to research on modular forms. Most of the material, despite its importance, had previously been unavailable in textbook form. Complete and readable proofs are given... In conclusion, this book is a welcome addition to the literature for the growing number of students and mathematicians in other fields who want to understand the recent developments in the theory of modular forms." #Mathematical Reviews# "This book will certainly be indispensable to all those wishing to get an up-to-date initiation to the theory of modular forms." #Publicationes Mathematicae#
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1985 with total page 1244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book National Museums written by Simon Knell and published by Routledge. This book was released on 2014-05-22 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt: National Museums is the first book to explore the national museum as a cultural institution in a range of contrasting national contexts. Composed of new studies of countries that rarely make a showing in the English-language studies of museums, this book reveals how these national museums have been used to create a sense of national self, place the nation in the arts, deal with the consequences of political change, remake difficult pasts, and confront those issues of nationalism, ethnicity and multiculturalism which have come to the fore in national politics in recent decades. National Museums combines research from both leading and new researchers in the fields of history, museum studies, cultural studies, sociology, history of art, media studies, science and technology studies, and anthropology. It is an interrogation of the origins, purpose, organisation, politics, narratives and philosophies of national museums.
Download or read book NATO Glossary of Terms and Definitions written by North Atlantic Treaty Organization and published by CreateSpace. This book was released on 2013-03-08 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: NATO Glossary of terms and definitions (English and French). Listing terms of military significance and their definitions for use in NATO.
Download or read book The Structural Basis of Muscular Contraction written by John Squire and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: Muscular contraction provides one of the most fascinating topics for a biophysicist to study. Although muscle comprises a molecular machine whereby chemical energy is converted to mechanical work, its action in producing force is something that is readily observable in everyday life, a feature that does not apply to most other structures of biophysical inter est. In addition, muscle is so beautifully organized at the microscopic level that those important structural probes, electron microscopy (with the associated image analysis methods) and X-ray diffraction, have pro vided a wealth of information about the arrangements of the constituent proteins in a variety of muscle types. But, despite all this, the answer to the question "How does muscle work?" is still uncertain, especially with regard to the molecular events by which force is actually generated, and the question remains one of the major unsolved problems in biology. With this problem in mind, this book has been written to collect together the available evidence on the structures of the muscle fila ments and on their arrangements in different muscle cells, to extract the common structural features of these cells, and thus to attempt to define a possible series of mechanical steps that will describe at molecular resolu tion the process by which force is generated. The book cannot be considered to be an introductory text; in fact, it presents a very detailed account of muscle structure as gleaned mainly from electron microscopy and X-ray diffraction.
Download or read book Government at a Glance Southeast Asia 2019 written by OECD and published by OECD Publishing. This book was released on 2019-09-10 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Government at a Glance Southeast Asia 2019 is the first edition in the Government at a Glance series for the region. It provides the latest available data on public administrations in the 10 ASEAN member countries: Brunei Darussalam, Cambodia, Indonesia, Lao People’s Democratic Republic, Malaysia, Myanmar, the Philippines, Singapore, Thailand and Viet Nam.
Download or read book National Museums and Nation building in Europe 1750 2010 written by Peter Aronsson and published by Routledge. This book was released on 2014-12-05 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: Europe’s national museums have since their creation been at the centre of on-going nation making processes. National museums negotiate conflicts and contradictions and entrain the community sufficiently to obtain the support of scientists and art connoisseurs, citizens and taxpayers, policy makers, domestic and foreign visitors alike. National Museums and Nation-building in Europe 1750-2010 assess the national museum as a manifestation of cultural and political desires, rather than that a straightforward representation of the historical facts of a nation. National Museums and Nation-building in Europe 1750-2010 examines the degree to which national museums have created models and representations of nations, their past, present and future, and proceeds to assess the consequences of such attempts. Revealing how different types of nations and states – former empires, monarchies, republics, pre-modern, modern or post-imperial entities – deploy and prioritise different types of museums (based on art, archaeology, culture and ethnography) in their making, this book constitutes the first comprehensive and comparative perspective on national museums in Europe and their intricate relationship to the making of nations and states.
Download or read book Subcritical Assemblies written by W. Maurice Pritchard and published by . This book was released on 1963 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Arctic Shipping written by Frédéric Lasserre and published by Routledge. This book was released on 2019-09-05 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book considers both the present state of Arctic shipping and possible future trends with reference to the various sectors of maritime transportation: cruise tourism, container traffic and bulk shipping. Ports are analysed as tools that support the strategies of coastal states to foster the development of resource extraction, enhance the attractiveness of Arctic shipping lanes and enable the control of maritime activities through coast guard deployment. The aim of this book is to draw a picture of the trends of Arctic shipping. How is traffic evolving in Canada’s Arctic, or along the Northern Sea Route? Are there significant differences between bulk and container shipping segments when considering the Arctic market? How are the ports and the hinterland developing and what are the strategies behind those? How is the legal framework shaping the evolution of maritime transportation? The contributors to this book consider all of these questions, and more, as they map out the prospects for Arctic shipping and analyse in detail the development of Arctic shipping as a result of multi-variable interactions. This book will be key reading for industry professionals and post-graduate students alike.
Download or read book Radioisotope Instruments written by J. F. Cameron and published by Elsevier. This book was released on 2013-10-22 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: International Series of Monographs in Nuclear Energy, Volume 107: Radioisotope Instruments, Part 1 focuses on the design and applications of instruments based on the radiation released by radioactive substances. The book first offers information on the physical basis of radioisotope instruments; technical and economic advantages of radioisotope instruments; and radiation hazard. The manuscript then discusses commercial radioisotope instruments, including radiation sources and detectors, computing and control units, and measuring heads. The text describes the applications of radioisotope instruments in the industries, including mining and quarrying; agriculture, forestry, and fishing; manufacturing industries; transport and communications; and civil engineering constructions. The manuscript also focuses on legislation and codes of practice on the use of sealed radioisotope sources and control of radiation hazard. The book is a dependable reference for readers interested in radioisotope instruments.
Download or read book Soil Analysis written by J. Gautheyrou and published by CRC Press. This book was released on 2001-01-01 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this book is to provide a better understanding of tools for soil analysis in order to use them more efficiently. It covers sampling problems as well as difficulties relating to actual analysis and quality control.
Download or read book NATO Glossary of Abbreviations Used in NATO Documents and Publications written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Legions of Pigs in the Early Medieval West written by Jamie Kreiner and published by Yale University Press. This book was released on 2020-10-27 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: An exploration of life in the early medieval West, using pigs as a lens to investigate agriculture, ecology, economy, and philosophy From North Africa to the British Isles, pigs were a crucial part of agriculture and culture in the early medieval period. Jamie Kreiner examines how this ubiquitous species was integrated into early medieval ecologies and transformed the way that people thought about the world around them. In this world, even the smallest things could have far‑reaching consequences. Kreiner tracks the interlocking relationships between pigs and humans by drawing on textual and visual evidence, bioarchaeology and settlement archaeology, and mammal biology. She shows how early medieval communities bent their own lives in order to accommodate these tricky animals—and how in the process they reconfigured their agrarian regimes, their fiscal policies, and their very identities. In the end, even the pig’s own identity was transformed: by the close of the early Middle Ages, it had become a riveting metaphor for Christianity itself.
