Libros de ciencias, página 38 de 2695

With the complexity of the cellular networks increasing day by day, a deeper understanding of the design and performance of end-to-end cellular networks is required. Moreover, all the types of networks from 2G-2.5G-3G seem to co-exist. "Fundamentals of Cellular Network Planning and Optimisation" covers end-to-end network planning and optimisation aspects from second generation GSM to third generation WCDMA networks including GPRS and EDGE networks. All the sub-systems of the network i.e. radio network, transmission network and core network have been covered with focus on both on practical and theoretical issues. By bringing all these concepts under one cover, this books becomes an essential reading for the network design engineers working either with cellular service vendors or operators, experts/scientists working on end-to-end issues and undergraduate/post-graduate students. Key Highlights of the book are: Distinctly divided into four parts with each part 2G (GSM), 2.5G (GPRS & EDGE), 3G (WCDMA) and introduction 4G (OFDM, ALL-IP, WLAN Overview) respectively Each part focuses on the radio, transmission and core networks. Not only does on cellular network planning process, also explains the underlying principles behind the planning and optimising the cellular networks. Written by leading experts in the field, and endorsed with forewords from Anthony Crane, Vice President, Delivery & Maintenance Services, Nokia Networks and Klaus Goerke, Director, Operational Solutions, Nokia Networks, the text will serve as a handbook for anyone engaged in the study, design, deployment and business of cellular Networks. "By 2008, some 2 billion people will be using mobile phones and devices, in many cases to access advanced data services. Against this backdrop, the need for efficient and effective network design will be critical to the success of increasingly complex mobile networks." "Simon Beresford-Wylie (SVP, Nokia Networks)" With the complexity of the cellular networks increasing day by day, a deeper understanding of the design and performance of end-to-end cellular networks is required. Moreover, all the types of networks from 2G-2.5G-3G seem to co-exist. "Fundamentals of" "Cellular Network Planning

Decision makers in many areas, from industry to engineering and the social sector, face an increasing need to consider multiple, conflicting objectives in their decision processes.In many cases these real world decision problems can be formulated as multicriteria mathematical optimization models. The solution of such models requires appropriate techniques to compute so called efficient, or Pareto optimal, or compromise solutions that - unlike traditional mathematical programming methods - take the contradictory nature of the criteria into account. This book provides the necessary mathematical foundation of multicriteria optimization to solve nonlinear, linear and combinatorial problems with multiple criteria. Motivational examples illustrate the use of multicriteria optimization in practice. Numerous illustrations and exercises as well as an extensive bibliography are provided.In the new edition a chapter on optimality conditions has been added. The linear programming part has been extended and includes new developments. Moreover, motivational examples are now introducing the majority of chapters.

he International System of Units (SI) is the world's most widely used system of measurement, used every day in commerce and science, and is the modern form of the metric system. It currently comprises the meter (m), the kilogram (kg), the second (s), the ampere (A), the kelvin (K), the candela (cd) and the mole (mol)). The system is changing though, units and unit definitions are modified through international agreements as the technology of measurement progresses, and as the precision of measurements improves. The SI is now being redefined based on constants of nature and their realization by quantum standards. Therefore, the underlying physics and technologies will receive increasing interest, and not only in the metrology community but in all fields of science. This book introduces and explains the applications of modern physics concepts to metrology, the science and the applications of measurements. A special focus is made on the use of quantum standards for the realization of the forthcoming new SI (the international system of units).The basic physical phenomena are introduced on a level which provides comprehensive information for the experienced reader but also provides a guide for a more intense study of these phenomena for students.

This book provides a comprehensiveoverview of the theory and practical development of metamaterial-based perfectabsorbers (MMPAs). It begins with a brief history of MMPAs whichreviews the various theoretical and experimental milestones in theirdevelopment. The theoretical background and fundamental working principles ofMMPAs are then discussed, providing the necessary background on how MMPAs workand are constructed. There then follows asection describing how different MMPAs are designed and built according to theoperating frequency of the electromagnetic wave, and how theirbehavior is changed. Methods of fabricating and characterizing MMPAs are thenpresented.

Separates essential underlying principles of quantum mechanics from specific applications and practical examples, dealing with each in different sections. Chapters emphasize principles; complementary sections supply applications. Provides a qualitative introduction to quantum mechanical ideas; a systematic presentation of the mathematical tools and postulates, including a discussion of their physical content and applications. Applications are not interdependent and can be used to focus on either physics or chemistry.

An accessible, comprehensive reference to modern quantum mechanics and field theory. In surveying available books on advanced quantum mechanics and field theory, Franz Gross determined that while established books were outdated, newer titles tended to focus on recent developments and disregard the basics. Relativistic Quantum Mechanics and Field Theory fills this striking gap in the field. With a strong emphasis on applications to practical problems as well as calculations, Dr. Gross provides complete, up-to-date coverage of both elementary and advanced topics essential for a well-rounded understanding of the field. Developing the material at a level accessible even to newcomers to quantum mechanics, the book begins with topics that every physicist should know-quantization of the electromagnetic field, relativistic one body wave equations, and the theoretical explanation of atomic decay. Subsequent chapters prepare readers for advanced work, covering such major topics as gauge theories, path integral techniques, spontaneous symmetry breaking, and an introduction to QCD, chiral symmetry, and the Standard Model. A special chapter is devoted to relativistic bound state wave equations-an important topic that is often overlooked in other books. Clear and concise throughout, Relativistic Quantum Mechanics and Field Theory boasts examples from atomic and nuclear physics as well as particle physics, and includes appendices with background material. It is an essential reference for anyone working in quantum mechanics today.

This work covers investigation techniques and analytical methodologies for addressing microbial contamination indoors. Microbial contamination indoors is a significant environmental and occupational health and safety problem. This book provides fundamental background information on fungal and bacterial growth indoors as well as in depth, practical approaches to analyzing and remedying problems. The information helps investigators, laboratory managers, and environmental health professionals properly use state of the science methods and correctly interpret the results. With chapters by expert microbiologists, mycologists, environmental professionals, and industrial hygienists, Sampling and Analysis of Indoor Microorganisms is a multidisciplinary, comprehensive reference on advanced approaches, covering: microbiological problems in a water damaged environment indoor construction techniques and materials that impact environmental microbiology microbial ecology indoors, airborne bacteria, genetic based analytical methods, and statistical tools for microorganism analysis microbiological sampling approaches and mold removal principles and methods, including specialized microbial remediation techniques for HVAC systems, legionellas and biofilms, and sewage contamination. It provides a forensic approach toward the assessment of fungal growth in the indoor environment. A must have guide for practicing professionals, including environmental health and safety personnel, public health officials, and building and construction engineers and architects, this is also a valuable reference for attorneys, home inspectors, water restoration personnel, mold remediation contractors, insurance adjusters, and others.

Created specifically for a Calculus II course and as a second volume for students who have completed the Larson team''s new Calculus I with Precalculus text, Calculus II, 7/e, comprises chapters 6-10 of Calculus with Analytic Geometry, 7/e. For a full description and a complete list of supplements, see catalog entry for Larson et al., Calculus with Analytic Geometry, 7/e.

Put as simply as possible, this is a book on Einstein's theory of gravity (general relativity). It is the first textbook on the subject that uses throughout the modern formalism and notation of differential geometry, and it is the first book to document in full the revolutionary techniques developed during the past decade to test the theory of general relativity.

The Separable Galois Theory of Commutative Rings, Second Edition provides a complete and self-contained account of the Galois theory of commutative rings from the viewpoint of categorical classification theorems and using solely the techniques of commutative algebra. Along with updating nearly every result and explanation, this edition contains a new chapter on the theory of separable algebras. The book develops the notion of commutative separable algebra over a given commutative ring and explains how to construct an equivalent category of profinite spaces on which a profinite groupoid acts. It explores how the connection between the categories depends on the construction of a suitable separable closure of the given ring, which in turn depends on certain notions in profinite topology. The book also discusses how to handle rings with infinitely many idempotents using profinite topological spaces and other methods.

This book discusses statistical methods that are useful for treating problems in modern optics, and the application of these methods to solving a variety of such problems

For more than a quarter century, Cotton and Wilkinson''s Advanced Inorganic Chemistry has been the source that students and professional chemists have turned to for the background needed to understand current research literature in inorganic chemistry and aspects of organometallic chemistry. Like its predecessors, this updated Sixth Edition is organized around the periodic table of elements and provides a systematic treatment of the chemistry of all chemical elements and their compounds. It incorporates important recent developments with an emphasis on advances in the interpretation of structure, bonding, and reactivity. From the reviews of the Fifth Edition: * "The first place to go when seeking general information about the chemistry of a particular element, especially when up-to-date, authoritative information is desired." -Journal of the American Chemical Society. * "Every student with a serious interest in inorganic chemistry should have [this book]." -Journal of Chemical Education. * "A mine of information . . . an invaluable guide." -Nature. * "The standard by which all other inorganic chemistry books are judged."-Nouveau Journal de Chimie. * "A masterly overview of the chemistry of the elements."-The Times of London Higher Education Supplement. * "A bonanza of information on important results and developments which could otherwise easily be overlooked in the general deluge of publications." -Angewandte Chemie.