Numerical Tokamak Turbulence Calculations on the CRAY T3E. PDF Download
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Author:
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Category :
Languages : en
Pages : 19
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Book Description
Full cross section calculations of ion-temperature-gradient-driven turbulence with Landau closure are being carried out as part of the Numerical Tokamak Turbulence Project, one of the U.S. Department of Energy's Phase II Grand Challenges. To include the full cross section of a magnetic fusion device like the tokamak requires more memory and CPU time than is available on the National Energy Research Scientific Computing Center's (NERSC's) shared-memory vector machines such as the CRAY C90 and J90. Calculations of cylindrical multi-helicity ion-temperature-gradient-driven turbulence were completed on NERSC's 160-processor distributed-memory CRAY T3E parallel computer with 256 Mbytes of memory per processor. This augurs well for yet more memory and CPU intensive calculations on the next-generation T3E at NERSC. This paper presents results on benchmarks with the current T3E at NERSC. Physics results pertaining to plasma confinement at the core of tokamaks subject to ion-temperature-gradient-driven-turbulence are also highlighted. Results at this resolution covering this extent of physical time were previously unattainable. Work is in progress to increase the resolution, improve the performance of the parallel code, and include toroidal geometry in these calculations in anticipation of the imminent arrival of a fully configured,512-processor, T3E-900 model.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Book Description
Full cross section calculations of ion-temperature-gradient-driven turbulence with Landau closure are being carried out as part of the Numerical Tokamak Turbulence Project, one of the U.S. Department of Energy's Phase II Grand Challenges. To include the full cross section of a magnetic fusion device like the tokamak requires more memory and CPU time than is available on the National Energy Research Scientific Computing Center's (NERSC's) shared-memory vector machines such as the CRAY C90 and J90. Calculations of cylindrical multi-helicity ion-temperature-gradient-driven turbulence were completed on NERSC's 160-processor distributed-memory CRAY T3E parallel computer with 256 Mbytes of memory per processor. This augurs well for yet more memory and CPU intensive calculations on the next-generation T3E at NERSC. This paper presents results on benchmarks with the current T3E at NERSC. Physics results pertaining to plasma confinement at the core of tokamaks subject to ion-temperature-gradient-driven-turbulence are also highlighted. Results at this resolution covering this extent of physical time were previously unattainable. Work is in progress to increase the resolution, improve the performance of the parallel code, and include toroidal geometry in these calculations in anticipation of the imminent arrival of a fully configured,512-processor, T3E-900 model.
Author: P. K. Shukla
Publisher:
ISBN:
Category : Nonlinear theories
Languages : en
Pages : 246
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Book Description
Author: Daniel Steven Katz
Publisher:
ISBN:
Category : Beowulf clusters (Computer systems)
Languages : en
Pages : 496
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Book Description
Author:
Publisher:
ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages : 336
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Book Description
Author: J. M. Coles
Publisher: Routledge
ISBN: 1317606000
Category : Social Science
Languages : en
Pages : 626
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Book Description
This book provides an account of the development of European culture and society during the Bronze Age, the time span between c. 2000 and 700 BC. It was a period of remarkable innovation, seen for instance in the development and growth of metallurgy as a major industry, the spread of trading contacts, the origins of urbanism and the beginnings of social stratification. The study is divided chronologically into two, the earlier and later Bronze Age, giving a clear picture of the nature of the radical changes which occurred in the period as a whole. The geographical area covered, from the Atlantic shores across Europe into the Soviet Union and from northern Scandinavia to the Mediterranean, is too vast to be taken as one unit, and has been broken down into five regions; each is discussed in terms of settlement form, burial practices, ritual and religious sites, material culture, economic and social background, and trading patterns. The book describes and develops common themes that link together the different areas and cultural groups, rather than taking the typographical approach often adopted by Bronze Age specialists, and uses the results of radiocarbon dating to establish an objective chronology for the period. The text is generously illustrated and fully documented with radiocarbon dating tables and extensive bibliography. Our understanding of Bronze Age Europe is still increasing, but no other book of this scope had been written before this, in 1979. It is a major study of its time of interest to anyone looking beyond popular accounts of the day.
Author: Elmer Bendiner
Publisher:
ISBN:
Category : Andalusia (Spain)
Languages : en
Pages : 260
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Book Description
A thousand years ago, Arabs & Jews built a paradise in the southern half of Spain. Everyone had the good life. This was a time of acceptance of differences.
Author: Anna Trosborg
Publisher: John Benjamins Publishing
ISBN: 9027285586
Category : Language Arts & Disciplines
Languages : en
Pages : 366
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Book Description
This book breaks new ground in translation theory and practice. The central question is: In what ways are translations affected by text types? The two main areas of investigation are: A. What are the advantages of focusing on text types when trying to understand the process of translation? How do translators tackle different text types in their daily practice? B. To what extent and in what areas are text types identical across languages and cultures? What similarities and dissimilarities can be observed in text types of original and translated texts?Part I deals with methodological aspects and offers a typology of translations both as product and as process. Part II is devoted to domain-specific texts in a cross-cultural perspective, while Part III is concerned with terminology and lexicon as well as the constraints of mode and medium involving dubbing and subtitling as translation methods. Sonnets, sagas, fairy tales, novels and feature films, sermons, political speeches, international treaties, instruction leaflets, business letters, academic lectures, academic articles, medical research articles, technical brochures and legal documents are but some of the texts under investigation. In sum, this volume provides a theoretical overview of major problems and possibilities as well as investigations into a variety of text types with practical suggestions that deserve to be weighted by anyone considering the relation between text typology and translation. The volume is indispensable for the translator in his/her efforts to become a “competent text-aware professional”.
Author: Douglas Biber
Publisher: Cambridge University Press
ISBN: 0521860601
Category : Language Arts & Disciplines
Languages : en
Pages : 355
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Book Description
This book describes the most important kinds of texts in English and introduces the methodological techniques used to analyse them. Three analytical approaches are introduced and compared, describing a wide range of texts from the perspectives of register, genre and style. The primary focus of the book is on the analysis of registers. Part 1 introduces an analytical framework for studying registers, genre conventions, and styles. Part 2 provides detailed descriptions of particular text varieties in English, including spoken interpersonal varieties (conversation, university office hours, service encounters), written varieties (newspapers, academic prose, fiction), and emerging electronic varieties (e-mail, internet forums, text messages). Finally, Part 3 introduces advanced analytical approaches using corpora, and discusses theoretical concerns, such as the place of register studies in linguistics, and practical applications of register analysis. Each chapter ends with three types of activities: reflection and review activities, analysis activities, and larger project ideas.
Author: R. J. Barlow
Publisher: John Wiley & Sons
ISBN: 9780471955962
Category : Science
Languages : en
Pages : 300
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Book Description
Strategien zur Lösung wissenschaftlicher Probleme mittels Fortran 90 und C++ sind Thema dieses Buches. Behandelt werden Fragestellungen, denen sich Naturwissenschaftler im Alltag häufig gegenübersehen, wie Simulationen, Graphik, Datenanalyse und die Manipulation von Datenstrukturen. Den Autoren kommt es nicht darauf an, zu zeigen, wie man ein Problem codiert - sie zielen eher auf die Vermittlung allgemeingültiger Prinzipien ab. Mit zahlreichen Beispielen. (8/98)
Author: Felix Aharonian
Publisher: Springer Science & Business Media
ISBN: 364236134X
Category : Science
Languages : en
Pages : 369
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Book Description
With the success of Cherenkov Astronomy and more recently with the launch of NASA’s Fermi mission, very-high-energy astrophysics has undergone a revolution in the last years. This book provides three comprehensive and up-to-date reviews of the recent advances in gamma-ray astrophysics and of multi-messenger astronomy. Felix Aharonian and Charles Dermer address our current knowledge on the sources of GeV and TeV photons, gleaned from the precise measurements made by the new instrumentation. Lars Bergström presents the challenges and prospects of astro-particle physics with a particular emphasis on the detection of dark matter candidates. The topics covered by the 40th Saas-Fee Course present the capabilities of current instrumentation and the physics at play in sources of very-high-energy radiation to students and researchers alike. This book will encourage and prepare readers for using space and ground-based gamma-ray observatories, as well as neutrino and other multi-messenger detectors.
