There is a need for a robust and accurate technique to measure ammonia (NH3) emissions from animal feeding operations (AFOs) to obtain emission inventories and to develop abatement strategies. Seasonal studies were conducted to measure NH3 emissions from open-lot and free-stall dairies in central Texas since summer of 2003. Ammonia emission flux (EFl) was measured using an isolation flux chambers (FC) protocol from ground level area sources (GLAS) and converted to emission factor (EF) to potentially develop source specific NH3 emission control strategies. The GLAS including open-lots, free-stall barns, separated solids, primary and secondary lagoons and milking parlor were sampled to estimate NH3 emissions. In the first study, assessment of summer and winter data from the open-lot dairy indicated that overall NH3 EFs were 11.6 ±7.1 kg NH3 year-1 head-1 for the summer and 6.2 ±3.7 kg NH3 year-1 head-1 for the winter season. The estimated annual NH3 EF was 9.4 ±5.7 kg NH3 year-1 head-1 for this open-lot dairy. The estimated NH3 emission factor for winter was nearly 47% lower than summer EF. Open-lot corrals (~63%) in summer and (~95%) in winter were the highest contributors to NH3 emissions for the open-lot dairy. In the second study, the EFs for the free-stall dairy were determined to be 11.1 ±4.9 kg NH3 year-1 head-1 for summer season and 4.7± 4.9 kg NH3 year-1 head-1 for winter season. The estimated annual NH3 EF was 8.4 ±4.9 kg NH3 year-1 head-1 for this free-stall dairy. In winter, composted manure and free-stalls contributed nearly 73% to the total NH3 emissions for the dairy. However in summer, approximately 65% of overall NH3 emissions were contributed by two lagoons at the dairy. The overall differences between winter and summer NH3 emissions from the dairies were due to ambient temperature variations and loading rates of manure on GLAS. There was spatial variation of NH3 emissions from the open-lot earthen corrals due to variable animal density within different divisions of the open-lot. This spatial variability was attributed to dispirit manure loading within these areas.

A method using CFD code PHOENICS to simulate flow and heat transfer in a rectangular chemical vapor deposition(CVD) chamber. We focus on the uniformity of heat and flow field. Two different kinds of boundary conditions at substrate, uniform wall heat flux and uniform wall temperature, are used to discuss the effects of the region of inlet, the distance from inlet to substrate, the region of outlet, Re number, and Pr number on uniformity of heat and flow field in chamber. The study finds that high shear stress and high Nu number will happen on the edge of substrate, and they can not improve the heat and flow field uniformity, We suggest that the substrate should be smaller than susceptor. In the case of uniform wall heat flux on substrate, higher shear stress and Nu number on the edge of substrate would result from the condition that the region of inlet is too big. Higher shear stress and Nu number on the region of stagnant point would result from the condition that the region of inlet is too small. Both of them are not good for uniformity. Such kinds of situations also happen in the variable of the distance from inlet to substrate. In uniform wall temperature on substrate, the condition of much higher Nu number on the edge of substrate is more obvious, which effects uniformity more seriously. The uniformity of Nu number could be improved effectively on the condition of region of inlet is 0.864*0.72, Higher distance from inlet to substrate.

This project was designed to determine the feasibility of constructing a multichamber proportional counter. A multi-chamber detector is designed to increase the total surface area which will increase the number of radiation interactions that occur per unit dose. Surface area can be changed without changing the detector volume by subdividing the active volume into several smaller volumes that can then be used as mini detectors whose data can be summed and used to determine the absorbed dose. This will allow the total surface area to remain the same as that of the more common 12.5 cm (5 in.) spherical detector and a decreased total volume resulting in a more compact detector design. However, subdividing those volumes causes problems with electric field fringing at the ends of the mini detectors. In order to correct this, guard ring and field tube designs which operate at a lower voltage than the detector cathode were tested. Results from this study showed that the field tube design provided the best overall resolution but it only outperformed the other designs by a maximum of 5%. However the field tube design doubles the length of the detector which would result in a larger overall detector package. The performance of the single and double ring configurations was suitable for radiation monitoring applications. These findings show that it is feasible to use an array of subdivided detector volumes instead of a spherical detector.

Inaug.-diss.--Jena. / Lebenslauf. "Quellenverzeichnis": p.[140]-142.

Thesis (D.M.A.)--University of Texas at Austin, 2000. / Vita. Includes bibliographical references (leaf 230). Discography: p. 231. Available also in a digital version from Dissertation Abstracts.

Thesis (D.M.A.)--University of Texas at Austin, 2000. / Vita. Includes bibliographical references (leaves 365-371). Available also in a digital version from Dissertation Abstracts.

Thesis (M.M.)--University of North Texas, 2001. / For piano and chamber orchestra (flute, oboe, clarinet, bassoon, trumpet, timpani and strings). Duration: ca. 9:00. Includes bibliographical references (p. xxxviii).

Thesis (D.M.A.)--University of Texas at Austin, 2000. / "Publisher's no.: UMI 9983127." Vita. Includes bibliographical references (leaves 365-371). Available also in a digital version from Dissertation Abstracts.

Sonata for clarinet and piano / F. Poulenc -- Knoxville: Summer of 1915 / S. Barber -- Premiere rhapsodie for clarinet and piano / C. Debussy -- Sonata for alto saxophone and piano, op. 19 / P. Creston. / text

Sechs Bagatellen / Gyorgy Ligeti -- Short stories / Jennifer Higdon -- Quatour pour saxophones en quatre parties, op. 102 / Florent Schmitt -- Saxteto / Victor Marquez-Barrios. / text