This volume surveys the chemistry and cancer-causing properties of the polycyclic hydrocarbons benzo[a]pyrene and benzo[e]pyrene. Benzo[a]pyrene is a pollutant formed whenever organic matter is burnt: it occurs in soot, tar, cigarette smoke and automobile exhaust, and in small amounts in the atmosphere, in water and in soil. It produces cancer in small mammals and is probably also carcinogenic in humans. It has been widely studied both as a measure of industrial pollution and as a model compound in studies of the mechanism of induction of cancer. Information about the compound is scattered through the scientific literature in various journals, conference proceedings and other publications; this book is the first to gather all this information together for easy reference. It includes chapters on the synthesis, physical and chemical properties of benzopyrene, its metabolism, interaction with DNA and induction of mutation and cancer, and also its environmental occurrence and analysis. There are copious references to the original literature. The volume will provide a valuable source of reference for: cancer reseach scientists; environmental scientists working in the area of pollution monitoring, public health, industrial safety, food and drugs; chemists and biochemists.
A comprehensive introduction to interval logic and duration calculus for modelling, analysing and verifying real-time systems. The Duration Calculus (DC) represents a logical approach to formal design of real-time systems. In DC real numbers are used to model time and Boolean-valued (i.e. {0,1}-valued) functions over time to model states of real-time systems. The duration of a state in a time interval is the accumulated presence time of the state in the interval. DC extends interval logic to a calculus to specify and reason about properties of state durations. The text covers theory (completeness, decidability, undecidability, model-checking), results, as well as case studies (Deadline Driven Scheduler).
Database management is attracting wide interest in both academic and industrial contexts. New application areas such as CAD/CAM, geographic information systems, and multimedia are emerging. The needs of these application areas are far more complex than those of conventional business applications. The purpose of this book is to bring together a set of current research issues that addresses a broad spectrum of topics related to database systems and applications. The book is divided into four parts: - object-oriented databases, - temporal/historical database systems, - query processing in database systems, - heterogeneity, interoperability, open system architectures, multimedia database systems.
TACS'91 is the first International Conference on Theoretical Aspects of Computer Science held at Tohoku University, Japan, in September 1991. This volume contains 37 papers and an abstract for the talks presented at the conference. TACS'91 focused on theoretical foundations of programming, and theoretical aspects of the design, analysis and implementation of programming languages and systems. The following range of topics is covered: logic, proof, specification and semantics of programs and languages; theories and models of concurrent, parallel and distributed computation; constructive logic, category theory, and type theory in computer science; theory-based systems for specifying, synthesizing, transforming, testing, and verifying software.
This book offers a model for concepts and their dynamics. A basic assumptionis that concepts are composed of specified components, which are representedby large binary patterns whose psychological meaning is governed by the interaction between conceptual modules and other functional modules. A recurrent connectionist model is developed in which some inputs are attracted faster than others by an attractor, where convergence times can beinterpreted as decision latencies. The learning rule proposed is extracted from psychological experiments. The rule has the property that that whena context becomes more familiar, the associations between the concepts of the context spontaneously evolve from loose associations to a more taxonomicorganization.
This is the Proceedings of The International Conference on eBusiness, eCommerce, eManagement, eLearning and eGovernance 2015. The event happened in University of Greenwich, London, United Kingdom in July 2015.
This book was written primarily for all those DTP users and programmers who want to keep up with the rapid development of electronic publishing, particular those who wish to develop new systems for the output of typefaces. In this volume, various formats are presented, their properties discussed and production requirements analyzed. Appendices provide readers additional information, largely on digital formats for typeface storage.
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