With 193 Figures and 13 Tables

Library of Congress Control Number: 2007930221

ISBN 978-3-540-73189-4 Springer Berlin Heidelberg New York

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Acknowledgement

The authors are always thankful to the Almighty for perseverance and achievements. They wish to thank Shri G. Rangaswamy, Managing Trustee, PSG Institutions, Shri C.R. Swaminathan, Chief Executive; and Dr.