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The book is divided into four sections. The first has four papers and deals with the fundamental concepts in thermoelectricity; the second section has four papers on basic parameters in thermoelectricity; the third includes five papers on chemical and physical properties of materials at high temperatures; and the fourth section has nine papers on measurement of material properties.

A conclusion, written by Dr. Egli, synthesizes the ideas and offers valuable guides for the selection of materials at this early stage of development.

This volume is based on part of a postgraduate course given at Chelsea College of Science and Technology in England. It is intended primarily for those who wish to obtain a better understanding of semiconductor devices based on carrier injection. The treatment does not presuppose any special knowledge of semiconductor physics, provided that the reader is prepared to accept the fundamental facts stated without proof in Chapter 1.

These relate mainly to the concepts of electrons and holes in the energy band diagram, mobility, transition processes, etc.

From there onwards, the treatment of excess carriers in semiconductors follows its own path with very little further reference to basic theory. In Chapter I, special emphasis is laid on some less familiar aspects of semiconductor theory, such as the question of neutrality and space charge.

Chapter II gives a brief review of recombination processes in semiconductors. Chapter III is an attempt at a comprehensive treatment of carrier transport in homogeneous media. Chapter IV gives a complete theory of current flow in p-n junctions and junction diodes, a subject which so far appears to have been neglected in textbooks. Chapter V deals with the theory of tahiti-junction structures in the light of the foregoing treatment.

The book closes with a brief discussion in Chapter VI of a subject rarely mentioned despite its fundamental imp o r t a n c e - t h e transport of excess carriers in homogeneous media.

This work will be welcomed by a large group of electrical engineers, physicists, and students at the graduate level as an indispensable supplement to the existing semiconductor literature. This book describes in readily understandable terms the principles of electronic digital computers.

The level of presentation is such that it may be used in technical institutes, for undergraduate level courses in universities, in industrial training programs, or for selfstudy. It is assumed that the reader already has an understanding of the basic electronic and electrical principles which would be covered in a first course in electronics, and a knowledge of elementary algebra. A single area is not concentrated upon, instead, the book deals only with the principles or fundamentals of digital computers, covering the important aspects of the subject in an introductory fashion.

Questions are provided at the end of each chapter. New York, Reinhold Publishing Corp. Based on a symposium sponsored by the Gas and Fuel Division of the American Chemical Society, this small but authoritative book covers the design and principles of operation of several kinds of fuel cells.

An excellent introduction by Liebhafsky and Douglas leads into the eight technical papers. The closing chapter is a well organized summary of the panel discussion which followed the symposium. Types of fuel cells treated are the hydrogen-oxygen air cell with carbon electrodes, the high-pressure hydrogen-oxygen cell, the high- and low-temperature cells, the carbonaceous cell, fuel gas cells, and the molten alkali carbonate cells.


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Digital computer fundamentals.





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