P. Hammond – författare

This book is a concise introduction to electromagnetic fields for students on degree and diploma courses. Physical processes and their descriptions are elucidated in words rather than mathematical symbols. Only simple differentiation, integration, and a little trigonometry are required. For this new edition there are new sections on electromechanics and high-frequency phenomena.

This is a fully revised and updated edition of a widely used introductory textbook on electromagnetism. It covers all the fundamental aspects of this important topic in electrical engineering. The approach is eminently practical and requires little mathematics other than elementary differentiation, integration, and trigonometry. It will continue to appeal to students studying this conceptually challenging but fundamental subject. New sections on electromechanics (conversion of electric and magnetic energy in mechanical energy and vice versa) and high-frequency phenomena (transmission lines, waveguides, optical fibres, and radio propagation) enhance the usefulness of the book.

This book is addressed to engineers, applied mathematicians, and physicists involved in the design and analysis of electromagnetic systems. Its chief purpose is to clarify the structure of electromagnetism. It begins with the Faraday-Maxwell insight that in electromagnetism one is faced with an interconnected dynamical system in which space and time are closely linked with physical phenomena. An appropriate basis is given via differential geometry to describe local relationships, via and topology to describe the system. These tools are introduced in the context of Maxwell's equations in the familiar vector notation. Equations are greatly simplified by the geometrical approach, and the geometrical idea of symmetry unifies the various conservation laws. This book clarifies the relationship between fields, potentials, and sources. Links between macroscopic and quantum phenomena are explored from a geometric angle and there is a simple discussion of superconductivity.

John Dryden was England's most outstanding and controversial writer for the last four decades of the seventeenth century. He dominated the literary world as a satirist, a skilled and versatile dramatist, a pioneer of literary criticism, a writer of religious poetry, and an eloquent translator from the great classical poets.

Using primary sources and personal experience, this volume traces the origins of microbiology at the government establishments at Porton Down. Begun in secrecy during World War II, early work concentrated on a response to the threat of biological warfare from Germany. It traces Porton's pioneering work on deadly diseases such as anthrax, through to the Centre's modern role in healthcare. It provides a source of information for scientists and historians alike, particularly for those interested in political and military history.