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An investigation is described of the propagation of surface waves on a plasma column, and their interaction with an electron beam penetrating the plasma. Apart from its basic plasma physics aspects, the study has been carried out with the aim of assessing the potential for application of this mechanism of amplification, and its coupling characteristics. The dispersion relation for plasma surface waves is first examined for several geometries in which the column is surrounded by one or two dielectric layers, with and without a surrounding conducting waveguide. For a practical geometry, and for the case of an electron beam filling the plasma, the dispersion relation for the combined beam/plasma system is analyzed according to general criteria for determining instability and wave types. A brief examination is made of the dispersion relation for the situation where the beam only partially fills the plasma. Preliminary experiments are described in which an attempt was made to measure growth in the surface wave mode, and to relate the measurements to the theory. (Author).
This is the first book on the market focusing specifically on the topic of geotechnical earthquake engineering. The book draws from the fields of seismology and structural engineering to present a broad, interdiciplinary view of the fundamental concepts in seismology, geotechnical engineering, and structural engineering.
The report concerns the possible amplification of waves in fluids due to fluctuations with time of some parameter which defines in part the natural frequencies of the system. Resonance is most likely to occur when some characteristic frequency is half of the frequency of parametric variation. First, the fluid is taken to be within a container which oscillates in the vertical direction so that the gravitational acceleration, relative to the container, varies with time. Both surface waves, in the case of an interface, and internal waves, in the case of continuous variation of density, are considered. In the latter case, the possible resonant frequencies have an upper bond. For an interface, rotation tends to eliminate the resonance of surface waves but to promote the resonance of inertial waves. For a continuous variation of density, rotation tends to place a lower bond on the possible resonant frequencies. Secondly, two fluids of different densities are taken to flow parallel to each other in an oscillatory manner and with different mean values of velocity. (Author).
This book gives a comprehensive overview of wave phenomena in different media with interacting mechanical, electromagnetic and other fields. Equations describing wave propagation in linear and non-linear elastic media are followed by equations of rheological models, models with internal rotational degrees of freedom and non-local interactions. Equations for coupled fields: thermal, elastic, electromagnetic, piezoelectric, and magneto-spin with adequate boundary conditions are also included. Together with its companion volume Vibrations and Waves. Part A: Vibrations this work provides a wealth of information about dynamical phenomena in different media and fields, which will be of considerable interest to both scientists and graduate students.
Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis seminated by the Center for lnformation and Numerica/ Data Analysis and Synthesis (C/NDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficia! to the academic and general scientific and technical community. After fi ve years of this joint undertaking we had concluded that it was in the interest of ali concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and App/ied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. Ali back issues can also be ordered from Plenum. We have reported in Volume 21 (thesis year 1976) a total of 10,586 theses titles from 25 Canadian and 219 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work.