A series of experiments were designed to test the effects of ¹³⁷cs irradiation on the viability of mouse embryos irradiated in vitro and subsequently transferred to recipient females or cultured in vitro. The first experiment was designed to evaluate the viability of embryos after combinations of whole body irradiation to the recipient (0, 100 and 200 R) and in vitro irradiation to the embryo (0, 100 and 200 R). Nine treatment combinations were possible. Controls, in which neither recipient or embryo were irradiated, resulted in 41.3% viable fetuses 14 days after irradiation and transfer. Controls were significantly different from all other treatments (P < 0.01). Embryo irradiation at 200 R resulted in 8.8, 4.8 and 12.1% viable fetuses when the recipients received 0, 100 and 200 R, respectively. Embryo irradiation at 100 R resulted in 15.6, 21.4 and 17.7% viable fetuses when the recipient received 0, 100 and 200 R. Irradiation of the recipient at 100 and 200 R, while the embryo was unirradiated, resulted in 18.4 and 25.3% viable fetuses. Irradiation of the embryo had a significant effect (P < 0.05) on the percentage of the fetuses alive 14 days after transfer. Irradiation of the recipient and the dam embryo interaction were not significant in terms of inducing embryonic mortality. There was no significant difference in resorption percentage between the nine treatments. The second experiment was designed to measure the day of death of embryos placed into each of three treatments. The treatments consisted of controls, recipients receiving 200 R and embryos 0 R, and recipients receiving 0 R and embryos 200 R. Recipients were autopsied on days 4 through 10 following transfer. There was no significant difference between treatments, or on days of autopsy between or within treatments. The two treatments involving irradiation were combined and the days of autopsy grouped into 4 and 5, 6 and 7 and 8, 9 and 10 and compared with controls. Viability and resorptions were significantly different (P < 0.05) on days 8, 9 and 10 in the irradiated embryos when compared with controls. The third experiment was designed to measure the response of mouse blastocysts irradiated at 0, 100 and 200 Rand cultured in vitro. Irradiation at 100 and 200 R significantly increased degeneration of embryos (P 0.01) and decreased hatching ability (P < 0.01). Embryos were examined using the differential interference contrast microscope at 24, 48 and 72 hours after receiving 0, 100 or 200 R. No consistent morphological changes due to irradiation were observed. / Master of Science

The objectives of the study performed at the Naval Nuclear Fuel Division of the Babcock and Wilcox Company were to (1) determine self-perceived continuing education needs of technical personnel, (2) determine how attitudes of technical personnel toward participation in continuing education programs were related to their present position, the attitude of their immediate supervisor, and division policy, and (3) recommend areas of concentration in providing programs needed to update technical personnel. Survey questionnaire data obtained from the study group was analyzed with respect to relevant material intended to profile the education background of the study group, consensus of responses between the study (Babcock and Wilcox) and control (Pennsylvania State) groups subject area continuing education needs of the study group, and formulated hypotheses. The findings of the study were: 1. Study group perceived needs were concentrated in required areas of technical competence in the work environment or were related to final application of the products manufactured by the Division. 2. Strong study group consensus concerning need for managerial training implied that the majority of personnel entertain aspirations for promotion into management positions. 3. Division policy and supervisor attitude toward continuing education were not found to be related to participation in formal continuing education programs. 4. Age was not found to be related to participation in either formal or informal learning programs. 5. Job function (administrative or applied technical) was not strongly related to either the type or extent of need for subjects relative to the work environment. / Master of Science

Three groups of rats were trained and extinguished with continuous (CRF) and partial (PR) reinforcement in the presence of two auditory stimuli differing in amount of similarity along a frequency dimension. Results revealed that in the groups where stimulus similarity was least, a within-subjects reversed partial reinforcement extinction effect (PREE) was found. The results also suggest that as similarity between the stimuli associated with CRF and PR decreased, the magnitude of the reversed PREE increased. This result is in contrast to Rashotte's (1971) predictions concerning the type of PREE produced as stimulus similarity varies along a single dimension. / Master of Science

The formation of shock waves by a moving piston and the thermal disturbance of a fixed wall by sudden temperature change are studied according to the kinetic theory of gases. The Ellipsoidal Statistical model which gives the correct Prandtl number for a monatomic gas has been solved numerically. Also, the perturbation method proposed by Chu is also applied. Velocity, density, temperature and pressure distributions have been calculated at each time step for various piston speeds for the piston problem. A comparison between the Bhatnager-Gross-Krook model solution and the Ellipsoidal Statistical model solution has been made. The thermal disturbances of velocity, density and temperature have I also been calculated at each time step for various wall temperatures. A comparison between the Kovitz-Hellman solutions and the Ellipsoidal model has been made. / Ph. D.

Using the Multiparticle Argo Spectrometer System, we have measured the charge prong multiplicity distribution as a function of the kinematic variable of the fast recoil proton for 190,000 events in the reaction pp→p+ANYTHING at 28.5 GeV/c. We find the distributions to be similar to charge prong multiplicities for pp →ANYTHING at different energies. We have looked for a KNO type scaling in W, P and t and find strong evidence only for scaling over W for a fixed range of t. Finally, the scaled distributions, both total and associated, as a function of Ware presented for comparison. / Ph. D.

A seismic reflection study over the Bane anticline in southwest Virginia (37° 16' 50" N, 80° 41' 30" W) was made in an attempt to gain information about the thickness of sedimentary rocks in this part of the Appalachian Valley and Ridge province. Eleven seismograms were obtained. In addition to frequency filtering, velocity filtering, and deconvolution, new methods of interpreting RMS velocity analyses were developed and applied. Persistent events at about 1.0 and 2.8 seconds were found, suggesting the presence of large reflection coefficients. On the basis of ultrasonic velocity measurements made on rock samples representative of the Cambrian sedimentary sequence and Precambrian basement rocks believed to underlie the Bane anticline, it was concluded that an unbroken Cambrian sequence overlying the basement could not produce reflection coefficients of the magnitude required, but that a thrust fault could. No definite conclusions about the structure beneath the Bane anticline could be reached, although the reflection at 2.8 seconds and the suggestion of a large reflection coefficient favor the interpretation of a thick, repeated sedimentary section. / Master of Science

Disotopic dating of zircons from the Flat River Complex in the Carolina "slate" belt north of Durham, N.C. shows this intrusive complex to be 650 ± m.y. old. Modal analyses of granophyric groundmass compared to experimental data, the presence of vent breccias and related pyroclastic deposits, and consideration of age relations between the intrusive and extrusive rocks indicate that the Flat River was emplaced at very shallow levels (< l km) and acted as the source for most of the volcanic material surrounding the complex. The age determined for the Flat River Complex indicates that deposition of the volcanic rocks began prior to 650 m.y. ago and extends the slate belt volcanicity interval to 130 m.y. (520 to 650 m.y. b.p.) Both subareal and marine depositional environments are represented in the stratigraphic sequence. / Master of Science

No description available.

No description available.

La siguiente tesis explora la evolución que se presenta en las letras de las canciones del músico argentino Charly García, entre los años 1974 y 1984 (antes, durante y después de la última dictadura militar de su país, conocida también como “Proceso de Reorganización Nacional”). Atravesando su participación en las bandas Sui Generis, La Máquina de Hacer Pájaros y Serú Girán, así como los inicios de su carrera solista, este estudio pretende identificar y explorar las estrategias narrativas que, desde lo literario, se hacen presentes a lo largo de la obra de García, priorizando el análisis sobre el uso del narrador metadiegético en primera persona, el mismo que utiliza Charly para plasmar una visión particular sobre la responsabilidad que tiene el artista frente a una sociedad convulsionada de la que también es parte. Asimismo, ahondaremos en el uso de referencias cinematográficas como estrategia para hablar del rol que tiene el arte en relación a (d)enunciar los atropellos que se ejecutan desde el poder, evadiendo los mecanismos de censura que la dictadura sistematizó. / Tesis