Master of Science

The magnetic amplifier is a device employing saturable reactors as its basic element. The theory or magnetic amplifiers is developed from the standpoint of rectangular hysteresis loops that are simplified in such a manner as to eliminate the problems of nonlinearity. The saturable reactor may be connected in either series or parallel combinations and their operation analyzed on the basis of voltage, current, and flux waveforms. The characteristics or the saturable reactor circuits may be enhanced by the addition of feedback. Feedback is accomplished either by magnetic means using additional windings, or by self-saturation in which rectifiers are used to secure feedback. The result is a device in which a small amount of power can effectively be used to control larger amounts of power. / Master of Science

The present investigation was undertaken to determine experimentally whether or not instability of the laminar boundary layer on blunt convex bodies exists when the wall-to-stagnation temperature is lowered. It was found that instability existed and theoretical considerations are given to the transition being associated with the formation of ice on the model surface and with an increase in roughness Reynolds numbers due to thinning of the laminar boundary layer at low wall-to-stagnation temperature ratios. The experimental tests were conducted on two-inch diameter spheres at M = 4.95 and free-stream Reynolds numbers per foot of approximately 72. 5 x 10⁶ or 12.1 x 10⁶ based on the model base diameter. Data were obtained tor both the hot wall and cold wall case. The stagnation temperature was approximately 400° F. Initial model wall temperatures were 97°F, for the hot wall test and -320° F for the cold wall tests. / M.S.

The velocities which are associated with the phenomenon of flame propagation can be studied by diverse experimental techniques. From the information gained through an extensive survey of literature a versatile apparatus which enables the measurement of uniform name and detonation velocities has been constructed. This was achieved by constructing a name tube made up of three sections of 1 ½” extra-heavy piping. Velocity measurements were made by sensing the name front at two locations along the axis or the flame tube through the use of ionization probes operated in conjunction with two amplification circuits. An oscilloscope and an electronic counter, operated in parallel with the amplifiers, provided the measurement of the time of flame travel. A series of tests were run in order to justify the capability of the apparatus to measure uniform name and detonation velocities. Stoichiometric mixtures of acetylene and air were used throughout the investigation. Uniform name velocities were determined to be between 339 and 469 cm/sec. Detonation velocities were observed to be around 1800 m/sec. / M.S.

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The discussion dealt with stylistic influences, compositional techniques, and performance considerations of chamber music involving clarinet composed by Bohuslav Martinu and included a performance of three of his works: Quartet. for clarinet, horn, cello, and side drum, Madrigals for oboe, clarinet, and bassoon, and Sextet for flute, oboe, clarinet, two bassoons, and piano. The selections performed and discussed in the lecture show compositional growth of the composer through the three periods of his life in which he composed chamber music which included winds. These three time periods are 1923-40 during his residency in Paris, 1941-56 during his residency in the United States, and 1957 until his death in 1959 when he returned permanently to Europe.

This research examines the use of education by the revolutionary government as an agent of directed culture change to effect sexual equality in Cuba. Upon a traditional Latin culture, the Revolution led by Fidel Castro in 1959 superimposed a Marxist sexually equalitarian philosophy. In order to examine education as a directed agent of culture change, it was first necessary to determine the revolutionary leadership's intent regarding the place of women in Cuban society as well as the success of the revolutionary leadership in achieving their intent. The policy and practices implemented to achieve success and the resultant consequences are also examined. A paradigmatic model of culture change is utilized in the analysis. This model is applied first to general cultural change by examining the place of women in four social arenas; three of these arenas (socio-political action, schooling and work) exist in the public culture domain. The fourth arena, the family, is in the private culture domain and warranted special consideration. The role of education in Cuba was then examined by means of a model generated from the educational data in the four arenas. From the above procedure, the specific preconditions necessary for education to act as an agent of directed culture change emerged. Education as implemented in post revolutionary Cuba was found to contain these preconditions. The family arena, however, because it is within the private culture domain is therefore relatively inaccessible to the control of the revolutionary leadership. Despite concerted effort since 1959 to achieve sexual equality, women in Cuba have not yet achieved total equality. This limited success of the revolutionary leadership achieving sexual equality may be attributed to its limited access to and control in the family. Significant advances have been made, however, toward achieving equality for women, and education in Cuba has contributed greatly to the degree of success. Education has been effective as an agent of directed culture change in Cuba because the education process was expanded to include a broad range of information transmission mechanisms, such as mass media and legislation, and because Marxism has provided a measure of philosophical consistency within the education process.

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Karl Jordan (1861-1959) was an extraordinarily productive entomologist who influenced the development of systematics, entomology, and naturalists' theoretical framework as well as their practice. He has been a figure in existing accounts of the naturalist tradition between 1890 and 1940 that have defended the relative contribution of naturalists to the modern evolutionary synthesis. These accounts, while useful, have primarily examined the natural history of the period in view of how it led to developments in the 1930s and 40s, removing pre-Synthesis naturalists like Jordan from their research programs, institutional contexts, and disciplinary homes, for the sake of synthesis narratives. This dissertation redresses this picture by examining a naturalist, who, although often cited as important in the synthesis, is more accurately viewed as a man working on the problems of an earlier period. This study examines the specific problems that concerned Jordan, as well as the dynamic institutional, international, theoretical and methodological context of entomology and natural history during his lifetime. It focuses upon how the context in which natural history has been done changed greatly during Jordan's life time, and discusses the role of these changes in both placing naturalists on the defensive among an array of new disciplines and attitudes in science, and providing them with new tools and justifications for doing natural history. One of the primary intents of this study is to demonstrate the many different motives and conditions through which naturalists came to and worked in natural history. It argues that understanding this diversity within the views, methods, and priorities of naturalists is not only important to developing a more accurate understanding of the naturalist tradition, but to understanding the ramifications of the complexity in the naturalist tradition for the fate of certain research programs as well. / Graduation date: 2004