Springer okt 1999 (13 Ergebnisse)

Buch. Zustand: Neu. Neuware - Structured adaptive mesh refinement (SAMR) methods have matured over the past 20 years and are now the method of choice for certain difficult problems, such as compressible flow. SAMR presents difficult technical challenges, both in terms of the numerical techniques involved and the complexity of the programming effort, especially on parallel computers. In order to gain insight into managing these difficulties, much research effort has been directed at mesh generation, parallel computation, and improvements in accuracy, aimed primarily at refinement interfaces. A major stumbling block in this endeavor is that many of these techniques entail substantial amounts of problem specific detail. Standardization is highly unlikely, except within narrowly defined problem domains. The papers presented in this collection are based on talks given at the Workshop on Structured Adaptive Mesh Refinement Grid Methods, held at the Institute for Mathematics and its Applications, University of Minnesota, on March 12-13 1997. They describe research to improve the general understanding of the application of SAMR to practical problems; identify issues critical to efficient and effective implementation on high performance computers; stimulate the development of a community code repository for software including benchmarks to assist in the evaluation of software and compiler technologies. The ten chapters of this volume have been divided into two parts reflecting two major issues in the topic: (I) programming complexity of SAMR algorithms and (II) applicability and numerical challenges of SAMR methods.…

Buch. Zustand: Neu. Neuware - Global pesticide use is currently estimated at approximately 2. 5 billion kg per year (Pimentel eta/. , 1998). To be effective, pesticides need to persist for a certain period of time. However, the longer their persistence, the greater the potential for transport of a fraction of the amount applied away from the target area. Pesticides are dispersed in the environment by water currents, wind, or biota. Pesticides can directly contaminate ground and surface waters by leaching, surface run-off and drift. Pesticides can also enter the atmosphere during application by evaporation and drift of small spray droplets, that remain airborne. Following application, pesticides may volatilise from the crop or the soil. Finally, wind erosion can cause soil particles and dust loaded with pesticides to enter the atmosphere. The extent to which pesticides enter the air compartment is dependent upon many factors: the properties of the substance in question (e. g. vapour pressure), the amount used, the method of application, the formulation, the weather conditions (such as wind speed, temperature, humidity), the nature of the crop and soil characteristics. Measurements at application sites reveal that sometimes more than half of the amount applied is lost into the atmosphere within a few days (Spencer and Cliath, 1990; Taylor and Spencer; 1990; Van den Berg et a/. , this issue).…

Buch. Zustand: Neu. Neuware - An understanding of emergent computation requires a profound revision of the most fundamental ideas. A noticeable attempt of such a rethinking is a world view in which natural systems are seen not as separate entities but as integrated parts of a unified whole. The book for the first time presents such a mathematical structure, which remarkably is based on integers as the single concept. As integers are considered to be the most fundamental entities irreducible to something simpler, this makes the mathematical structure a final theory, and thus we do not have to look for its explanation in terms of deeper concepts. The book is not only applicable to models of computation and optimization but also has scientific consequences, as it contributes to a rethinking of the most fundamental ideas about nature. Audience: The book is written at a level suitable for advanced undergraduate students and graduate students as well as research workers and practitioners in computer science information technology, mathematics and physics. The book is suitable as a reference or as supplementary reading material for an advanced graduate course. Only a basic knowledge of calculus is required.…

Buch. Zustand: Neu. Neuware - This book contains more than the IEEE Standard 1149.4. It also contains the thoughts of those who developed the standard. Adam Osseiran has edited the original writings of Brian Wilkins, Colin Maunder, Rod Tulloss, Steve Sunter, Mani Soma, Keith Lofstrom and John McDermid, all of whom have personally contributed to this standard. To preserve the original spirit, only minor changes were made, and the reader will sense a chapter-to-chapter variation in the style of expression. This may appear awkward to some, although I found the Iack of monotonicity refreshing. A system consists of a specific organization of parts. The function of the system cannot be performed by an individual part or even a disorganized collection ofthe same parts. Testing has a system-like characteristic. Testing of a system does not follow directly from the testing of its parts, and a system built with testable parts can sometimes be impossible to test. Therefore, testability of the system must be organized. Some years ago, the IEEE published the boundary-scan Standard 1149.1. That Standard provided an architecture for digital VLSI chips. The chips designed with the 1149.1 architecture can be integrated into a testable system. However, many systems today contain both analog and digital chips. Even if all digital chips are compliant with the standard, the testability of a mixed-signal system cannot be guaranteed. The new Standard 1149.4, described in this book, extends the previous architecture to mixed-signal systems.…

Buch. Zustand: Neu. Neuware - 'EURO'. The name of the single currency for the European Union has not been chosen casually by the Heads of State and Government during the Madrid Council of December 1995. After tough discus sions, it has been unanimously accepted. The intention was to recall to every single citizen that this new money would be his money, that it would be the expression of the new European environment carefully built since the 'fifties' to avoid any return to war and barbarism in Europe. Confidence and positive expectations for a better future put in the European construction have thus been clearly linked to the confidence in the new European currency and vice-versa. Euro notes and coins will be the first expression, clear, material and universal (for any European citizen being young or old, rich or poor, but also for the rest of the world) of a European identity alongside the national one. Obviously, it is of the outmost importance that the change over to the euro, be as smooth and as citizen-friendly as possible.…

Buch. Zustand: Neu. Neuware - The wide range of possible performance criteria for business enterprises raises serious questions of definition and measurement. Indeed, measurement is at the heart of the analysis of success and failure of business operations, and much depends on the quality of the information that is available. The evaluation of business performance comes into sharp focus with the pUblication of companies' annual and semi-annual accounts, which are then followed by commentaries from stockbrokers and business analysts in reports to investors and in articles in the financial press. Captains of industry may not have to suffer the indignity of frequent public opinion polls that gauge the popularity of politicians. Nevertheless, they are plagued by a similar phenomenon, in that views expressed by analysts, customers, shareholders and investors, serve as powerful reminders to senior executives that the business world is subject to many upheavals and that even the most seemingly secure can suddenly fall from grace.…

Buch. Zustand: Neu. Neuware - Combinatorial (or discrete) optimization is one of the most active fields in the interface of operations research, computer science, and applied math ematics. Combinatorial optimization problems arise in various applications, including communications network design, VLSI design, machine vision, air line crew scheduling, corporate planning, computer-aided design and man ufacturing, database query design, cellular telephone frequency assignment, constraint directed reasoning, and computational biology. Furthermore, combinatorial optimization problems occur in many diverse areas such as linear and integer programming, graph theory, artificial intelligence, and number theory. All these problems, when formulated mathematically as the minimization or maximization of a certain function defined on some domain, have a commonality of discreteness. Historically, combinatorial optimization starts with linear programming. Linear programming has an entire range of important applications including production planning and distribution, personnel assignment, finance, alloca tion of economic resources, circuit simulation, and control systems. Leonid Kantorovich and Tjalling Koopmans received the Nobel Prize (1975) for their work on the optimal allocation of resources. Two important discover ies, the ellipsoid method (1979) and interior point approaches (1984) both provide polynomial time algorithms for linear programming. These algo rithms have had a profound effect in combinatorial optimization. Many polynomial-time solvable combinatorial optimization problems are special cases of linear programming (e.g. matching and maximum flow). In addi tion, linear programming relaxations are often the basis for many approxi mation algorithms for solving NP-hard problems (e.g. dualheuristics). …

Buch. Zustand: Neu. Neuware - Rapid advances in Direct Numerical Simulation (DNS) and Large Eddy Simulation (LES) of turbulence provide opportunities for improved prediction of incompressible and compressible turbulent flows. The book includes five invited and thirty-eight contributed papers presented at the Second AFOSR International Conference on DNS and LES held at Rutgers - The State University of New Jersey, on June 7-9, 1999. A broad range of topics in DNS and LES are presented, including new developments in LES modeling, numerical algorithms for LES and DNS, DNS and LES of reacting flows, and DNS and LES for supersonic and hypersonic boundary layers. The book provides a extensive view of the state of the art in DNS and LES.…

Buch. Zustand: Neu. Neuware - The aim of the present book is to give, in a single volume, an introduction to the fields of transition, turbulence and combustion modelling of compressible flows and to provide the physical background for today's modelling approaches in these fields. The basic equations for compressible flows are presented (Ch. 1). The fundamental aspects of hydrodynamical instability are discussed (Ch. 2). along with transition prediction methods in industrial applications (Ch. 3). Turbulence modelling approaches ranging from single-point models (Ch. 4, 5) to large-eddy simulation techniques (Ch. 6), direct numerical simulations (Ch. 7) and turbulence combustion modelling (Ch. 8) are covered. The book addresses engineers and researchers, in industry or academia, who are entering into the fields of transition, turbulence or combustion modelling research or who need to apply turbulence or transition prediction methods in their work.…

Buch. Zustand: Neu. Neuware - Mr. Chairman, ladies and gentlemen, with great pleasure I like to welcome you in the cityofGroningen and hope that you will have an enriching and enlighten ing discussion on the conference theme on risk management in blood trans fusion. The organisation of this symposium aims at scientific networking by discussing in an international forum the most important themes of current interest in relation to the state of the art in transfusion medicine. Dr. Cees Smit Sibinga took the initiative in 1976 to start organising the blood bank symposia as they were named in the beginning. Without doubt these symposia have contributed considerably to the development of transfusion medicine. To illustrate the fact that these symposia came to my attention I recollect that I have attended the symposium in 1978, chaired by Dr. Leo Vroman, in my capacity in those days of alderman deputy mayor of the city. So, it has been a long time since. After having been away from Groningen for 18 years I have been inaugurated last week as a mayor and it is a plcasure to be again in your midst. The scries of annual symposia on blood transfusion have contributed to mark the city of Groningen on the map of the international scientific world. A great number of prestigious institutes all over the world involved in the development of transfusion medicine have linked to Groningen and we are proud of that.…

Buch. Zustand: Neu. Neuware - Over recent years, a considerable amount of effort has been devoted, both in industry and academia, towards the performance modelling, evaluation and prediction of Asynchronous Transfer Mode (ATM) networks. This book describes recent advances in ATM networks reflecting the state-of-the-art technology and research achievements worldwide. In addition, it provides a fundamental source of reference in the ATM field. Research topics discussed in detail include: Traffic Modelling and Characterisation; Routing; Switch and Multiplexer Models; Call Admission Control (CAC); Congestion Control; Resource Allocation; Quality of Service (QoS); Tools and Techniques. This volume contains recently extended refereed papers of the 5th International Workshop on Performance Modelling and Evaluation of ATM Networks, which was sponsored by the International Federation for Information Processing (IFIP) and held in Ilkley, UK in July 1997. Performance Analysis of ATM Networks continues the tradition established by the first three IFIP volumes on the subject, and it is ideal for personnel in computer/communication industries as well as academic and research staff in computer science and electrical engineering.…

Buch. Zustand: Neu. Neuware - Broadband communications is widely recognized as one of the key technologies for building the next generation global network infrastructure to support ever-increasing multimedia applications. This book contains a collection of timely leading-edge research papers that address some of the important issues of providing such a broadband network infrastructure. Broadband Communications represents the selected proceedings of the Fifth International Conference on Broadband Communications, sponsored by the International Federation for Information Processing (IFIP) and held in Hong Kong in November 1999. The book is organized according to the eighteen technical sessions of the conference. The topics covered include internet services, traffic modeling, internet traffic control, performance evaluation, billing, pricing, admission policy, mobile network protocols, TCP/IP performance, mobile network performance, bandwidth allocation, switching systems, traffic flow control, routing, congestion and admission control, multicast protocols, network management, and quality of service. It will serve as an essential reference for computer scientists and practitioners.…

Buch. Zustand: Neu. Neuware - Seven years have elapsed since Dr. Renee Ford, editor-in-chief of Materials Technology, first suggested to me to publish a book on Functionally Graded Materials (FGMs). She said that the FGM concept, then largely unknown outside of Japan and a relatively few laboratories elsewhere, would be of great interest to everyone working in the materials field because of its potentially universal applicability. There was no book about FGMs in English at that time, although the number of research papers, review articles, and FGM conference proceedings had been increasing yearly. We discussed what the book should cover, and decided it should present a comprehensive description from basic theory to the most recent applications of FGMs. This would make it useful both as an introduction to FGMs for those simply curious about what this new materials field was all about, and also as a textbook for researchers, engineers, and graduate students in various material fields. The FGM Forum in Japan generously offered to support this publication program. is very difficult for an individual author to write a book that Because it covers such a wide range of various aspects of many different materials, I invited more than 30 eminent materials scientists throughout the world, who were associated with FGM research, to contribute selected topics. I also asked several leading researchers in this field to edit selected chapters: Dr. Barry H. Rabin, then at the U. S.…