A high-order stabilization filter was formerly designed to stabilize an unstable pitch control system of a terminal homing missile system. In this report, a new dominant-data matching method is presented to redesign the high order stabilization filter. Using this new method several reduced order filters are obtained. As a result, the cost of implementation is reduced and the reliability is increased. An algebraic method is also applied to redesign the stabilization filter so that the performance of the redesigned pitch control system is improved. In addition, the proposed dominant-data matching method can be applied to determine a reduced order model of a high order system. Unlike the reduced order models obtained by most existing model reduction methods, the reduced order model mentioned above has the exact assigned frequency-domain specifications of the original system. The dominant-data matching method can also be applied to identify any practical system. (Author).

Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * 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 beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all 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 Applied 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. All back issues can also be ordered from Plenum. We have reported in Volume 23 (thesis year 1978) a total of 10,148 theses titles from 27 Canadian and 220 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. While Volume 23 reports these submitted in 1978, on occasion, certain universities do report theses submitted in previous years but not reported at the time.

A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).