Bücher veröffentlicht von Springer Netherlands

Force and motion control systems of varying degrees of sophistication have shaped the lives of all individuals living in industrialized countries all over the world, and together with communication technology are largely responsible for the high standard ofliving prevalent in many communities. The brains of the vast majority of current control systems are electronic, in the shape of computers, microprocessors or programmable logic controllers (PLC), the nerves are provided by sensors, mainly electromech­ anical transducers, and the muscle comprises the drive system, in most cases either electric, pneumatic or hydraulic. The factors governing the choice of the most suitable drive are the nature of the application, the performance specification, size, weight, environ­ mental and safety constraints, with higher power levels favouring hydraulic drives. Past experience, especially in the machine tool sector, has clearly shown that, in the face of competition from electric drives, it is difficult to make a convincing case for hydraulic drives at the bottom end of the power at fractional horsepower level. A further, and frequently range, specifically overriding factor in the choice of drive is the familiarity of the system designer with a particular discipline, which can inhibit the selection of the optimum and most cost-effective solution for a given application. One of the objectives of this book is to help the electrical engineer overcome his natural reluctance to apply any other than electric drives.

This text is based on papers presented at a Peat Dewatering symposium at Rivere-du-Loup, Quebec, Canada, in June 1985.

Proceedings of an interdisciplinary meeting, sponsored by the Commission of the European Communities, as advised by the Committee on Medical and Public Health Research

Understanding ceramic processes requires simultaneous consideration of the thermodynamics of chemical equilibrium and the kinetic limitations on the attainment of equilibrium imposed through finite atomic mobilities and the probabilistic nature of complex phase formation. The equilibrium phase diagram, its thermodynamic basis and interpretation are considered here as effecting processing decisions in raw materials selection and processes before firing, as well as in optimization of process tempertaures for reaction and sintering for the development of unique microstructures. Consideration of long-term environmental and thermal equilibration are also discussed, particularly in electronic materials for sensor devices as well as conventional refractory applications.

A seminar in the Community Programme for the Coordination of Agricultural Research, held in Brussels, Belgium, April 7-9, 1987

The International Commission on Radiological Protection and the Euratom Council directive have specified that workers exposed to ionizing radiation shall be subjected to individual dose monitoring. In the past, individual doses have almost always been monitored by film badge dosimeters, but thermoluminescent dosimeters (TLDs) are now coming into widespread use, principally due to the availability of automated readout systems. Techniques and Management of Personnel Thermoluminescence Dosimetry Services gives details of the operation of and experience gained with a number of large-scale TL personnel dosimetry services, with particular attention being paid to the management aspects of such services. For technical and administrative personnel in TLD services, TLD system designers, staff of licensing authorities concerned with dosimetric licensing, students of radiation protection, especially in the area of protection from ionizing radiation. A basic knowledge of atomic and nuclear physics is assumed, and a training in radiation protection or health physics would be an advantage.

'Et moi, "'J si j'avait su comment en revcnir, One seMcc mathematics has rendered the je n'y semis point aile.' human race. It has put common sense back Jules Verne where it belongs, on the topmost shclf next to the dusty canister labelled 'discarded non­ sense'. The series is divergent; therefore we may be able to do something with it. Eric T. Bell O. Heaviside Mathematics is a tool for thought. A highly necessary tool in a world where both feedback and non­ linearities abound. Similarly, all kinds of parts of mathematics serve as tools for other parts and for other sciences. Applying a simple rewriting rule to the quote on the right above one finds such statements as: 'One service topology has rendered mathematical physics .. .'; 'One service logic has rendered com­ puter science .. .'; 'One service category theory has rendered mathematics .. .'. All arguably true. And all statements obtainable this way form part of the raison d'etre of this series.

This book forges a synthesis between the discipline of behavioural ecology and what is known of the social behaviour and population dynamics of cyclic populations of vertebrates, with particular discussion of the cyclic voles and lemmings. Areas of uncertainty, and those which show promise are identified, and tests of competing hypotheses are suggested. Finally, the relevance of social dynamics to population growth and decline are examined, and a hypothesis on the role of aggressiveness in expanding populations is presented.

The aim of this book is to re-evaluate the true pest status of many common species traditionally regarded as pests. It is based on a revised selection of papers presented at a symposium organized by the Mammal Society in London, November 1987.

Proceedings of the Sixth Symposium of the International Research Group on Colour Vision Deficiencies

A few years ago, a real break-through happened in observational astronomy: the un­ derstanding of the effect of atmospheric turbulence on the structure of stellar images, and of ways to overcome this dramatic degradation. This opened a route to diffraction-limited observations with large telescopes in the optical domain. Soon, the first applications of this new technique led to some outstanding astrophysical results, both at visible and infrared wavelengths. Yet, the potential of interferometric observations is not fully foreseeable as the first long-baseline arrays of large optical telescopes are being built or cOIIllnissioned right now. In this respect a comparison with the evolution of radio-astronomy is tempting. From a situation where, in spite of the construction of giant antennas, low angular resolution was prevailing, the introduction of long baseline and very long baseline interferometry and the rapid mastering of sophisticated image reconstruction techniques, have brought on a nearly routine basis high dynamic range images with milliarcseconds resolution. This, of course, has completely changed our views of the radio sky.

Proceedings of a Workshop Held in Angers, France, November 26-28, 1986, Sponsored by the Commission of the European Communities Directorate General for Science, Research and Development

Collected Papers from the Seventh International Symposium on Biochemical Aspects of Kidney Function, Bratislava, 9-12 April 1984

Despite the fact that the incidence of gastric cancer is declining in the Western world, it remains a significant problem with respect to accurate diagnosis and treatment since it has a high mortality rate. In June 1989 an International Conference was held at the University of Rome "La Sapienza" entitled "New Trends in Gastric Cancer: Background and videosurgery". During this meeting background information on the aetiopathogenesis of gastric cancer was presented together with talks and video presentations on the latest advances in the treatment of gastric carcinoma, both from the European and Japanese experience. Because of the poor prognosis of gastric carcinoma there is increasing pressure for early detection. Some of the problems in the early detection of gastric carcinoma are discussed together with methods of surveillance of high-risk subjects. It is generally accepted that the surgical approach to gastric carcinoma should take into account the site and extent of the lesion and there are chapters on new methods for pre and intraoperative staging of the disease which allow a more logical approach to surgery. A comparison between Japanese and Western rule and results was attempted and reasons for the differences were investigated. Since the field is still evolving not all aspects could be covered, and those angles not approached in this book will be addressed in a second International Conference to be held in Rome in June 1990.

Proceedings of the Workshop in Ascochyta Blight and Winter Sowing of Chickpeas, held in Aleppo, Syria, May 4-7, 1981

Proceedings of a Seminar held in Brussels on June 3-4, 1986, at the Commission of the European Communities

A Seminar in the CEC Programme of Coordination of Research in Animal Husbandry, held in Dublin, Ireland, on October 30-31, 1985. Sponsored by the Commission of the European Communities, Directorate-General for Agriculture, Division for the Coordination of Agricultural Research.

Distributed AI is the branch of AI concerned with how to coordinate behavior among a collection of semi-autonomous problem-solving agents: how they can coordinate their knowledge, goals and plans to act together, to solve joint problems, or to make individually or globally rational decisions in the face of uncertainty and multiple, conflicting perspectives. Distributed, coordinated systems of problem solvers are rapidly becoming practical partners in critical human problem-solving environments, and DAI is a rapidly developing field of both application and research, experiencing explosive growth around the world. This book presents a collection of articles surveying several major recent developments in DAI. The book focuses on issues that arise in building practical DAI systems in real-world settings, and covers work undertaken in a number of major research and development projects in the U.S. and in Europe. It provides a synthesis of recent thinking, both theoretical and applied, on major problems of DAI in the 1990s.

Proceedings of the 146th Symposium of the International Astronomical Union, held in Paris, France, June 4-9, 1990

Proceedings of a workshop held in Brussels, Belgium within the framework of the European Community Medical and Public Health Research

2 The authors of these issues involve not only mathematicians, but also speci­ alists in (mathematical) physics and computer sciences. So here the reader will find different points of view and approaches to the considered field. A. M. VINOGRADOV 3 Acta Applicandae Mathematicae 15: 3-21, 1989. © 1989 Kluwer Academic Publishers. Symmetries and Conservation Laws of Partial Differential Equations: Basic Notions and Results A. M. VINOORADOV Department of Mathematics, Moscow State University, 117234, Moscow, U. S. S. R. (Received: 22 August 1988) Abstract. The main notions and results which are necessary for finding higher symmetries and conservation laws for general systems of partial differential equations are given. These constitute the starting point for the subsequent papers of this volume. Some problems are also discussed. AMS subject classifications (1980). 35A30, 58005, 58035, 58H05. Key words. Higher symmetries, conservation laws, partial differential equations, infinitely prolonged equations, generating functions. o. Introduction In this paper we present the basic notions and results from the general theory of local symmetries and conservation laws of partial differential equations. More exactly, we will focus our attention on the main conceptual points as well as on the problem of how to find all higher symmetries and conservation laws for a given system of partial differential equations. Also, some general views and perspectives will be discussed.