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Electromagnetic pollution is the permeation of the environment with undesirable static and alternating electric and magnetic fields. The undesirable fields are usually man-made. Electromagnetic pollution is different from other types of pollution, such as air, water, and noise pollution, in two ways. First, it is almost always invisible, and second
Microwave properties of magnetostatic surface waves in saturated ferrimagnets are described. Particular emphasis is given to experimental aspects of the subject. A summary background is given of pertinent experimental investigations of magnetostatic surface waves (MSSW) from 1968, when they were first observed, to the present. Certain features such as nonreciprocity, electronic tunability, and high coupling efficiencies are discussed. Propagation losses, between 4 and 15 GHz, on chemically-polished yttrium iron garnet (YIG) slabs were measured. Effects of inhomogeneous internal fields, the effects of placing metal conducting planes parallel to the surface upon which the waves propagate to modify the dispersion relation, and the effects of surrounding a single crystal slab (supporting resonant modes) with metal coated polycrystalline YIG to increase field homogeneity, are considered. Magnetostatic surface wave losses, above a few GHz, are less than those of acoustic surface waves. It is concluded that MSSW technology complements ASW technology at high frequencies. (Modified author abstract).
Rotation rate sensors have important applications in navigation and guidance control systems. An investigation of magnetostatic surface waves (MSSW) in yttrium iron garnet (YIG) films on cylindrical surfaces was undertaken as a first step in fabricating a new type of rotation rate sensor recently proposed at AFCRL. The sensor employs magnetic (or acoustic) waves in a ring laser type configuration.
This is the second volume on "Optical Information Processing" within the scope of the US-USSR Science Cooperation Program co sponsored by the US National Science Foundation and the USSR Acad emy of Sciences Siberian Branch. Volume I was published in 1976, also by Plenum Press, and con tained the papers presented by a group of US and USSR scientists at the First US-USSR Science Cooperation Seminar "Optical Informa tion Processing" held at the US National Academy of Sciences in Washington, D. C. from 16 to 20 June 1975. The seminar was followed by a series of visits to US scientific research laboratories and universities, to which the visiting USSR scientists were escorted bv Dr. W. E. Kock and Dr. G. W. Stroke. The visits included Bell Laboratories, IBM Thomas J. Watson Research Laboratory and M. I. T. , as reported in detail in the FOREWORD of Volume I. Volume II now presents the papers presented by another group of US and USSR scientists, some having participated in the first seminar: this series of papers was presented at the Second US-USSR Science Cooperation Seminar on "Optical Information Processing" held at the USSR Academy of Sciences Siberian Branch Institute of Auto mation and Electrometry in the famous "science city" of Akademgorodok, near Novosibirsk in Siberia, USSR from 10 to 16 July 1976.
The year 1973 marked the first time that Atlanta, one of the cultural centers of the South, has hosted the Cryogenic Engineering Conference since its beginning in 1954. The Cryogenic Engineering Conference gratefully acknowledges the hospital ity of the Georgia Institute of Technology and the assistance of W. T. Ziegler and his staff in making the visit to Atlanta a pleasant and memorable one. Several significant changes were initiated at the 1973 Cryogenic Engineering Conference. These included a Conference theme on the subject of "Energy and the Environment," a new Conference format, and the beginning of a new Conference frequency of biennial meetings. While retaining the traditional topics of previous meetings, the 1973 Cryogenic Engineering Conference focused on the role of cryo genic engineering in the generation, distribution, and conversion of energy, and the related environmental effects. In these areas, much of the current interest stems from the environmental effects of LNG and liquid hydrogen as compared with other competing energy forms. These rapidly expanding areas may provide the impetus to cryogenic engineering in the 1970's that the space program provided in the 1960's. The Conference format was altered by the use of numerous invited papers highlighting the theme. These presentations were concentrated in plenary sessions initiating each day's activities, and in seminars designed to summarize the various aspects of the theme.