Springer berlin heidelberg dez 2012 (507 risultati)

Taschenbuch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering - Der neue Penrose ist eine Zusammenfassung von Penroses Sicht der modernen Kosmologie - diesmal unter Anwendung thermodynamischer Konzepte, die ein zyklisches Universum beschreiben: Die Entwicklung verläuft vom Urknall zum Endknall, mit dem ein neuer Zyklus von Zeit und Raum beginnt. Der Bestseller - jetzt im Taschenbuch.…

Taschenbuch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering.

Taschenbuch. Condizione: Neu. Neuware -Die regenerativen Energietrager haben bereits heute einen signifikanten Anteil an der weltweiten Stromerzeugung. 1m Jahre 1997 trugen sie knapp 20 % zur Gesamt produktion von etwa 12. 000 TWh bei. Dieser Anteil wurde fast ausschlieBlich von der Wasserkraft gedeckt, der Beitrag der Solarthermie war mit 0,7 TWh sehr klein, obwohl bereits Ende des letzten, Anfang dieses Jahrhunderts erste Anlagen u. a. zum Antrieb von Bewasserungspumpen auf Basis solarthermischer Stromerzeugung gebaut wurden. Der Einsatz von kostengtinstigerem 01 und anderen fossilen Brenn stoffen verhinderte damals weitere Entwicklungen, und erst mit dem Beginn der Energiekrise 1973/74 wurden diese Technologien neu entdeckt. Wahrend die Para bolrinnenkraftwerke SEGS I-IX mit 354 MWel in Kalifornien schon bewiesen, daB unter gtinstigen Rahmenbedingungen ein kommerzieHer Betrieb moglich ist, bieten z. B. Paraboloidkraftwerke mit im Brennpunkt angeordneten Stirling-Motoren erst die Perspektive, bei Serienfertigung Strom in abgelegenen Gebieten des aquatoria len Gtirtels giinstiger zu gestehen als die dort bisher genutzten Dieselaggregate. ABe solarthermischen Anlagen erfordern eine direkte Einstrahlung von mindestens 2 1800 kWh/m a, so daB ihr Einsatz nur in Gebieten zwischen etwa 40° nordlicher und siidlicher Breite, also beispielsweise nicht in Deutschland, okonomisch sinnvoH ist. Das hier vorliegende Buch ist aus dem Skriptum zur Vorlesung 'Stromerzeugung durch erneuerbare Energietrager', weche an der Ruhr-Universitat Bochum seit dem Wintersemester 1996 als Wahlfach bzw. als Teilnahmefach der Vertiefungsrichtung 'Energieversorgung' gelesen wird, hervorgegangen. 192 pp. Deutsch.…

Taschenbuch. Condizione: Neu. Neuware - Dieses moderne Lehrbuch ist aus Vorlesungen und Übungen der Verfasser zur Theorie des elektromagnetischen Feldes (Elektromagnetik) und zur Höheren Mathematik hervorgegangen. Da die Technik vom Ingenieur immer umfassendere und tiefere mathematische und theoretische Kenntnisse verlangt, gehen die Autoren über den üblichen Vorlesungsstoff der Grundkurse hinaus und stellen insbesondere die Themen Variations- und Tensorrechnung voran. Es wird ein neuer -für den Ingenieur unüblicher Weg- gegangen, indem sie aus dem Prinzip der kleinsten Wirkung mittels der vorgenannten Rechnungen die Maxwellschen Gleichungen herleiten. Durch die Voranstellung von Relativitätsprinzip und dem Prinzip von der Konstanz der Lichtgeschwindigkeit erhält der Leser einen einfachen Einstieg in relativistische Betrachtungen.…

Buch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering - Das Kursbuch zur Befundung von Thorax-Röntgenbildern!Basierend auf den erfolgreichen Thorax-Kursen der Autoren, Frau Prof. Okka Hamer und Herrn Prof. Feuerbach,findet derLeser in diesem Buch eine detaillierte und leicht verständliche Anleitung zursystematischen Bildanalyse von konventionellen Thorax-Röntgenbildern.Ob Pneumonie, pulmonaler Rundherd oder Pneumothorax - das Erkennen häufig vorkommender Diagnosen wird anhand großformatiger Röntgenbilder ausführlich erklärtund kann anschließend anhand von Fallbeispielen im Buch geübt werden. Mit zusätzlichen 60 Fallbeispielen können in einem interaktiven PDF (online kostenlos zum Buch verfügbar) die Kenntnisse spielerisch überprüft nd verbessert werden.Für Assistenzärzteder Radiologie, Anästhesie oder Inneren Medizin - denn sie alle werden im ärztlichen Alltag mit diesen Röntgenbildern konfrontiert.Ob präoperativ, auf Normal- oder Intensivstation- mit diesem Buch ist dieBefundung eines Röntgen-Thorax kein Problem mehr.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The study of the genetic basis for evolution has flourished in this century, as well as our understanding of the evolvability and programmability of biological systems. Genetic algorithms meanwhile grew out of the realization that a computer program could use the biologically-inspired processes of mutation, recombination, and selection to solve hard optimization problems. Genetic and evolutionary programming provide further approaches to a wide variety of computational problems. A synthesis of these experiences reveals fundamental insights into both the computational nature of biological evolution and processes of importance to computer science. Topics include biological models of nucleic acid information processing and genome evolution; molecules, cells, and metabolic circuits that compute logical relationships; the origin and evolution of the genetic code; and the interface with genetic algorithms and genetic and evolutionary programming. 352 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The purpose of these lecture notes is to develop a theory of asymptotic expansions for functions involving two variables, while at the same time using functions involving one variable and functions of the quotient of these two variables. Such composite asymptotic expansions (CAsEs) are particularly well-suited to describing solutions of singularly perturbed ordinary differential equations near turning points. CAsEs imply inner and outer expansions near turning points. Thus our approach is closely related to the method of matched asymptotic expansions. CAsEs offer two unique advantages, however. First, they provide uniform expansions near a turning point and away from it. Second, a Gevrey version of CAsEs is available and detailed in the lecture notes. Three problems are presented in which CAsEs are useful. The first application concerns canard solutions near a multiple turning point. The second application concerns so-called non-smooth or angular canard solutions. Finally an Ackerberg-O'Malley resonance problem is solved. 176 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This research monograph provides a pedagogical and self-contained introduction to non-equilibrium quantum particle dynamics for inhomogeneous systems, up to and including a survey of recent breakthroughs pioneered by the authors and other groups. The theoretical approach is based on real-time Green's functions (Keldysh Green's functions), directly solving the two-time Kadanoff-Baym equations (KBE). This field has seen a rapid development over the last decade, with new applications emerging in plasma physics, semiconductor optics and transport, nuclear matter and high-energy physics. This text will be a valuable starting point and reference work for graduate students and researchers interested in the quantum dynamics of inhomogeneous systems. 144 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This monograph derives direct and concrete relations between colored Jones polynomials and the topology of incompressible spanning surfaces in knot and link complements. Under mild diagrammatic hypotheses, we prove that the growth of the degree of the colored Jones polynomials is a boundary slope of an essential surface in the knot complement. We show that certain coefficients of the polynomial measure how far this surface is from being a fiber for the knot; in particular, the surface is a fiber if and only if a particular coefficient vanishes. We also relate hyperbolic volume to colored Jones polynomials.Our method is to generalize the checkerboard decompositions of alternating knots. Under mild diagrammatic hypotheses, we show that these surfaces are essential, and obtain an ideal polyhedral decomposition of their complement. We use normal surface theory to relate the pieces of the JSJ decomposition of the complement to the combinatorics of certain surface spines (state graphs). Since state graphs have previously appeared in the study of Jones polynomials, our method bridges the gap between quantum and geometric knot invariants. 184 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Kunita, H.:Stochastic differential equations and stochastic flows of diffeomorphisms.-Elworthy, D.: Geometric aspects of diffusions on manifolds.-Ancona, A.:Théorie du potential sur les graphs et les variétiés.-Emery, M.:Continuous martingales in differentiable manifolds. 516 pp. Englisch.…

Buch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Clustering is an important unsupervised classification technique where data points are grouped such that points that are similar in some sense belong to the same cluster. Cluster analysis is a complex problem as a variety of similarity and dissimilarity measures exist in the literature.This is the first book focused on clustering with a particular emphasis on symmetry-based measures of similarity and metaheuristic approaches. The aim is to find a suitable grouping of the input data set so that some criteria are optimized, and using this the authors frame the clustering problem as an optimization one where the objectives to be optimized may represent different characteristics such as compactness, symmetrical compactness, separation between clusters, or connectivity within a cluster. They explain the techniques in detail and outline many detailed applications in data mining, remote sensing and brain imaging, gene expression data analysis, and face detection.The book will be useful to graduate students and researchers in computer science, electrical engineering, system science, and information technology, both as a text and as a reference book. It will also be useful to researchers and practitioners in industry working on pattern recognition, data mining, soft computing, metaheuristics, bioinformatics, remote sensing, and brain imaging. 280 pp. Englisch.…

Buch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This present report, as a second volume of the series entitled 'Contemporary Logistics in China: an Introduction,' follows the same general conceptual organization, yet with updated analysis and discussion of logistics development, under the backdrop of the aftermath of the international financial crisis, the acceleration of the transformation of development mode and the strategic adjustment of the economic structure. 216 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Inter-organizational Cooperation with SAP Solutions- now in its second edition -describes the potential for cooperation in supply chain networks as well as the use of mySAP solutions in an inter-organizational context. The main focus is on applications from the fields of XML/EDI, data warehousing, supply chain management and electronic markets. On the basis of five case studies from the automotive industry, the use of mySAP solutions is demonstrated in practice. This second edition has been totally revised to take account of current challenges concerning building up cooperation from both the management and the software perspective. In order to achieve this, the author team was expanded. 260 pp. Englisch.…

Buch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware - The institutional and legal status of the WTO, with its integrated dispute settlement system, provides a framework for certainty, security and stability for trade as well as a coherent system to protect intellectual property rights. In all member countries and their respective enterprises, WTO regulations need to be considered when designing and implementing trade-related strategies for business operations in the integrated global market. This book aims at giving upper-level undergraduates and graduate students a comprehensive understanding of the public regulations related to international trade within the WTO mechanism and equip them, as potential policy makers and future practitioners in international trade, with the practical skills to interpret and apply the multilateral trade regulations as outlined by the WTO. 432 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The highly developed industrial countries today have to face the challenge of accelerated structural change. The problems arising from this process are tackled in very different ways. In the public discussion the different approaches of Japan on the one side and of Western European countries on the other have received consider able attention. Structural change in its economic, social and political aspects has been the subject of the 8th German-Japanese Seminar on Economics and Social Sciences, held at Cologne from the 24th to the 27th of September, 1984. The tradition of German-Japanese Seminars on Economics and Social Sciences goes back to 1966, when the first meeting was held at Tokyo. Among the first participants were Dr. Hiromi Arizawa, Dr. Kazuo Okochi, both professors at the University of Tokyo, and Dr. Karl Hax, professor at Frankfurt University. The objective of all seminars, which have been held since, has been the analysis of eco nomic and social problems of immediate interest in both countries. The records of former seminars, which have been published partly in Japanese, partly in German throw light upon the shift of empha sis toward new problems which took place during aperiod of 18 years. 204 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -In 1984, the University of Bonn (FRG) and the International Institute for Applied System Analysis (IIASA) in Laxenburg (Austria), created a joint research group to analyze the relationship between economic growth and structural change. The research team was to examine the commodity composition as well as the size and direction of commodity and credit flows among countries and regions. Krelle (1988) reports on the results of this 'Bonn-IIASA' research project. At the same time, an informal IIASA Working Group was initiated to deal with prob lems of the statistical analysis of economic data in the context of structural change: What tools do we have to identify nonconstancy of model parameters What type of models are particularly applicable to nonconstant structure How is forecasting affected by the presence of nonconstant structure What problems should be anticipated in applying these tools and models Some 50 experts, mainly statisticians or econometricians from about 15 countries, came together in Lodz, Poland (May 1985); Berlin, GDR (June 1986); and Sulejov, Poland (September 1986) to present and discuss their findings. This volume contains a selected set of those conference contributions as well as several specially invited chapters. 512 pp. Englisch.…

Buch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -,The papers in this collection, written by a cross-regional group of experts, provide insights into the causes of declining levels of citizen participation and other distinct forms of civic activism in Europe and explore a range of factors contributing to apathy and eventually disengagement from vital political processes and institutions. At the same time, this volume examines informal or unconventional types of civic engagement and political participation corresponding to the rapid advances in culture, technology and social networking. The volume is divided into three interrelated parts: Part I consists of critical essays in the form of theoretical approaches to analysing weakening political participation and citizen estrangement; Part II is dedicated to an exploration of the role and deployment of technologically advanced media, such as the internet, as determinants of changing patterns of political participationist behaviour. Finally, Part III presents findings of empirical research on the issue of political participation. Combining theoretical and empirical perspectives, the book contributes towards a better understanding of the disquieting trend of voter apathy and disenchantment with politics in the context of the ongoing process of European integration, and offers a variety of analytical tools for decoding both the emergence of alternative conceptualizations of citizenship and other forms of meaningful civic and political engagement. 304 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This book deals with the numerical analysis and efficient numerical treatment of high-dimensional integrals using sparse grids and other dimension-wise integration techniques with applications to finance and insurance. The book focuses on providing insights into the interplay between coordinate transformations, effective dimensions and the convergence behaviour of sparse grid methods. The techniques, derivations and algorithms are illustrated by many examples, figures and code segments. Numerical experiments with applications from finance and insurance show that the approaches presented in this book can be faster and more accurate than (quasi-) Monte Carlo methods, even for integrands with hundreds of dimensions. 200 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The first complete genome sequence of a multicellular organism, Caenorhabditis elegans, has been determined recently. Several more will follow soon, among them the genome sequences of Drosophila melanogaster and the human. With these achievements, the stage is set for the next phase of 'large-scale' biology, the study of the function of genes and the interactions between their protein products. The aim of the Ernst Schering Research Foundation Workshop 29 was to discuss the contribution of research on model organisms which are particularly suited for genetic and biological research, to the understanding of gen eral principles of biology as well as the basis for human diseases. This area of research has not only unveiled the basic molecular mechanisms of development of higher organisms, but has also made major contri butions to the elucidation of complex signal transduction pathways that play crucial roles both in ontogeny and human diseases. Establishing the complete molecular anatomy of an organism is a demanding but rather well-defined task. However, compared to the technical and scientific challenges of large-scale sequencing and the bioinformatics analysis of complete genome data, the assignment of function to the genes of multicellular organisms may still seem like a fishing expedition, with no universal road to success. One approach is based on large-scale technologies. The use of mi croarrays for multiple gene expression analysis is one element in this effort, providing important information on the cell- or tissue-specific activation of genes over time. 260 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This book introduces laser drilling processes including modelling, quality assessment of drilled holes, and laser drilling applications. It provides insights into the laser drilling process and the relation among the drilling parameters pertinent to improved end product quality. This book is written for engineers and scientists working on laser machining, particularly laser drilling. 96 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Experts in herbicide research and development - chemists and plant physiologists -, have written 15 chapters that review all aspects pertinent to peroxidizing herbicides, compounds of topical interest since extremely low use rates ensure high environmental safety. Topics covered include structure-activity relationships, relevant patent literature, preparative methods, modes of action, greenhouse screening, laboratory assays, plant pigment biochemistry, and enzymology of the decisive target enzyme of this class of herbicides. This comprehensive review will be welcomed as a unique and timely compilation of the current status of peroxidizing herbicide research and development. It will be of interest to professional chemists and biologists in agrochemical companies, universities and agricultural colleges. 424 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This book constitutes the thoroughly referred post-workshop proceedings of the 23rd International Workshop on Combinatorial Algorithms, IWOCA 2012, held in Krishnankoil, Tamil Nadu, India, in July 2012.The 32 revised full papers presented were carefully reviewed and selected from a total of 88 submissions. The papers are organized in topical sections in algorithms and data Structures, applications (including Bioinformatics, Networking, etc.), combinatorics of words and strings, combinatorial optimization, combinatorial enumeration, decompositions and combinatorial designs, complexity theory (structural and computational), computational biology and graph theory and combinatorics submissions. 316 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This volume contains the notes from five lecture courses devoted to nonautonomous differential systems, in which appropriate topological and dynamical techniques were described and applied to a variety of problems. The courses took place during the C.I.M.E. Session 'Stability and Bifurcation Problems for Non-Autonomous Differential Equations,' held in Cetraro, Italy, June 19-25 2011. Anna Capietto and Jean Mawhin lectured on nonlinear boundary value problems; they applied the Maslov index and degree-theoretic methods in this context. Rafael Ortega discussed the theory of twist maps with nonperiodic phase and presented applications. Peter Kloeden and Sylvia Novo showed how dynamical methods can be used to study the stability/bifurcation properties of bounded solutions and of attracting sets for nonautonomous differential and functional-differential equations. The volume will be of interest to all researchers working in these and related fields. 320 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -th At the 6 International Cancer Congress held meantime the new committee has endeavored at Sao Paulo a list of tumors, intended to produce a simple, generally acceptable primarily for the purpose of statistical codi tumor nomenclature founded on logical prin fication, was presented and accepted with ciples of pathology. A first draft without pictures was published in slight alterations only. This list had been prepared by the Committee on Tumor Nomen 'ACTA' Vol. XIV No. 3-1958, which is now clature and Statistics, of the International followed by an illustrated edition. We are Union against Cancer, under the chairman greatly indebted to all the authors and publish ship of Dr. PERRY. It had also served as ers for permission to use their illustrations and a basis for the somewhat simplified code for providing us with the original prints. submitted to WHO, which circulated it Unfortunately it was not possible to obtain as document WHOjHSjCANCj24.1. An al the original prints for the figures from the Atlas of Tumor Pathology; we therefore had phabetical index to the code, mostly ba sed on terms in use in the United States, to use the printed illustrations for repro constitutes part 2 of this document (WHOj duction and are grateful to the Armed Forces Institute of Pathology for permission HSjCAN/C24.2). The preparation of a list of descriptive terms to use them. 324 pp. Englisch, Französisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This book is a short introduction to power system planning and operation using advanced geometrical methods. The approach is based on well-known insights and techniques developed in theoretical physics in the context of Riemannian manifolds. The proof of principle and robustness of this approach is examined in the context of the IEEE 5 bus system. This work addresses applied mathematicians, theoretical physicists and power engineers interested in novel mathematical approaches to power network theory. 112 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -to Boundary Elements Theory and Applications With 194 Figures Springer-Verlag Berlin Heidelberg New York London Paris Tokyo Hong Kong Dr.-Ing. Friedel Hartmann University of Dortmund Department of Civil Engineering 4600 Dortmund 50 FRG ISBN-13: 978-3-642-48875-7 e-ISBN-13: 978-3-642-48873-3 001: 10.1007/978-3-642-48873-3 Library of Congress Cataloging-in-Publication Data Hartmann, F. (Friedel) Introduction to boundary elements: theory and applications/Friedel Hartmann. ISBN-13: 978-3-642-48875-7 1. Boundary value problems. I. Title. TA347.B69H371989 515.3'5--dc19 89-4160 This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, re-use of illustrations, recitation, broadcasting, reproduction on microfilms or in other ways, and storage in data banks. Duplication of this publication or parts thereof is only permitted under the provision of the German Copyright Law of September 9,1965, in its version of June 24,1985, and a copyright fee must always be paid. Violations fall under the prosecution act of the German Copyright Law. Springer-Verlag Berlin Heidelberg 1989 Softcover reprint of the hardcover 1 st edition 1989 The use of registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. 432 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Bioremediation of organic pollutants and heavy metals by use of microorganisms represents a safe, inexpensive, and environmentally-friendly concept in modern environmental engineering. During the last three decades intense efforts have been made by microbiologists and environmental engineers in the isolation and characterization of microorganisms capable of degradation, transformation and detoxification of recalcitrant chemical compounds of environmental concern: (polyhalogenated) dibenzo-p-dioxins, dibenzofurans, and diphenyl ethers. Special emphasis is placed on the potential of molecular biology techniques to improve presently available biocatalysts. 300 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Theoretical and numerical details of an optimized LCAO (linear combination of atomic orbitals) method for the calculation of self-consistent bandstructures are given together with a variety of examples. The method will be a valuable tool both for researchers engaged in calculations and for scientists looking for numerical results of self-consistent bandstructure calculations. The presentation starts with an introduction to the modern many-body theory of electronic bandstructure. The essentials of the representation with a non-orthogonal basis and the usual tight-binding variants are critically reviewed. A variational approach to the optimization of atom-like basis orbitals is described together with an SCF procedure for band calculations. Complete numerical and graphic results for all elementary metals from lithium to zinc are given. 224 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Agent technology has recently become one of the most vibrant and fastest growing areas in information technology. This is the first systematic introduction to software agents with the goal of exploiting them in future communication systems. The coherently written chapters provide complementary coverage of the relevant issues. Multi-agent systems and mobile agent approaches are presented and applied to important topics in future communication systems. 404 pp. Englisch.…

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -More than 800 papers were presented by neurosurgeons from 66 countries during the 7th International Congress of Neurological Surgery, held in Munich on 12-18 July 1981. With the present scope and problems of neurosurgery as its theme, the congress achieved its aims in making possible the exchange and dissemination of new knowledge and ideas and in facilitating personal contact between neurosurgeons from aU parts of the world. Of such importance are the regional differences within our branch of science that we should spare no effort in acquainting ourselves with those neurosurgical problems which lie beyond the boundaries of our local horizons. From the vast number of papers the editor has selected those whose high scientific standard merits greater exposure than that given by the conference itself. I should like to thank the editor for his work and Springer-Verlag for their involvement in our disci pline. It is to be hoped that this book will find a worldwide audience, in accordance with the intentions of the World Federation of Neurosurgical Societies. Prof. Dr. K.-A. Bushe President of the Congress v Editor's Preface This is the first volume of a new series which aims to provide an overview of the state of the art of neurosurgery every four years. It will contain papers covering various fields of our specialty, selected from among those presented at each International Congress of Neurological Surgery. 504 pp. Englisch.…