An initial evaluation of the scalability of extrusion foaming technology is conducted in this thesis. Both lab- and pilot-scale foam extrusion systems along with annular dies and flat dies were used to investigate the effects of extrusion system scale on the foam expansion. The effects of the processing conditions including die temperature and blowing agent content on the volume expansion of extruded polystyrene foams blown with carbon dioxide are presented. A systematic comparison of the effects of extrusion system scale on the expansion behavior of polystyrene foams blown with carbon dioxide at the consistent pressure-drop rate, demonstrated that the scale of the foam extrusion system does not affect the principles of the foaming process, and the effects of extrusion system size on the scale-up of foam techniques, such as shear rate and temperature uniformity, could be suppressed by tailoring the processing conditions and experimental parameters.

This study examines the preparation during high school and post-secondary outcomes of students with disabilities. High school preparation consists of activities in which students participated during high school. Post-secondary outcomes relate to the current status of students following high school graduation in relation to the four major outcomes areas: (a) post-secondary education, (b) employment, (c) independent living, and (d) recreation and leisure. The target population included all students graduating from one school district in a mid-sized city in Texas. A stratified random sample of 228 students both with and without disabilities was selected. Post-secondary follow-up surveys, consisting of one survey administered prior to graduation and one survey administered six-months following graduation, were given to the participants. The response rate for the initial exit survey was 82.9% while the response rate for a post-school survey was 61.4%. Differences between groups were analyzed using loglinear analyses based upon educational setting, disability category, gender, ethnicity, and socio-economic status. In addition, a sub-study was completed to determine the level of agreement among students and teachers on a post-secondary readiness skill inventory. The findings indicated that differences among groups did exist in terms of both high school preparation and post-secondary outcomes. In terms of high school preparation, the participation among various groups produced few results that were significantly different. Statistically significant results occurred only with respect to extracurricular activity participation by educational setting and socio-economic status. Post-secondary outcome results produced more statistically significant findings than high school preparation. The variable of educational setting produced statistically significant post-secondary outcomes in the three areas of employment, post-secondary education, and recreation and leisure. Ethnicity was the next largest determinant to influence post-secondary outcomes, and statistically significant results were found for both post-secondary education and independent living. Socio-economic status produced statistically significant results for employment outcomes. The variable of gender produced no results that reached statistical significance. The last findings provided an analysis of the agreement between students and teachers in terms of a post-secondary readiness skill inventory. Overall students and teachers demonstrated a high level of congruency in which similar responses were indicated within 95% of the items.

Engagements homosexuels et lutte contre le sida au sein de l'association Act Up-Paris--Anthropologie sociale et ethnologie--Paris--EHESS, 2003. / Bibliogr. p. 407-439. Index.

Microtubules (MTs), whose basic units are a and ß tubulin proteins, are self-assembled proteinaceous filaments with nanometer scale diameters and micrometer scale lengths. Their aspect ratio, directionality, the reversibility of their assembly and their ability to be metallized by electroless plating make them good candidates to serve as templates for the fabrication of nanowires and other nanoscale devices. In addition, tubulin proteins can provide biological interactions with a naturally high specificity.Toward the goal of manufacturing MT-based metallic nanowires and networks of nanowires on a silicon wafer, I studied the influence of pH, temperature, and several biomolecules on the stability of MTs in solutions, as well as the surface effect on the dynamics of disassembly of microtubules. Secondly, I demonstrated the metallization of MTs by electroless nickel plating both in solution and on hydrophilic oxidized Si surface. After being activated by Pt, nickel coated MT surfaces during the electroless plating, with a thickness of several nanometers. Due to the different kinetics of the process, MTs metallized on the oxidized Si wafer are slightly different from MTs metallized in solutions. Finally, we explored controlled nucleation and growth of microtubules directly from a collection of g-tubulin monomers. g-tubulins bind to modified gold electrodes on a silicon wafer through an organic linker, Glutathione s-transferase, creating a g-tubulin layer for MT growth. MTs unambiguously originated from the surface-bound g-tubulin layer on the gold electrode, proving that the surface-bound g-tubulin retains its biological ability of nucleating MT growth.

The purpose of this study is to develop, evaluate, and apply a CRISSP-2D river ice model for a highly complex reach of the Nelson River upstream of the Jenpeg Generating Station in northern Manitoba. The calibrated model is applied in a backcasting scenario to evaluate its potential of predicting the river ice regime associated with specific hydraulic and meteorologic conditions. Secondly, a real-time application is conducted in collaboration with Manitoba Hydro to forecast overnight ice conditions as part of the 2011 Ice Stabilization Program. The model is shown to be fully capable of predicting the onset and type of ice regime that occurs. Spatial variation in ice generation across the study region is accurately captured, including locations of thermal bridging and initial ice front advance. Several modelling limitations associated with parameterization limit model accuracy during the latter stages of freeze-up and are identified as enhancement opportunities.

No description available.

Thesis (M.A.)--Georgia State University, 2007. / Title from file title page. Michelle Brattain, committee chair; Larry Youngs, committee member. Electronic text (111 p.) : digital, PDF file. Description based on contents viewed Nov. 7, 2007. Includes bibliographical references (p. 109-111).

Thesis (Ph. D.)--University of Iowa, 2008. / Thesis supervisor: Bruce Gronbeck. Includes bibliographical references (leaves 158-170).

Thesis (M.A.)--Georgia State University, 2007. / Includes bibliographical references (p. 102-104).

Zugl.: Saarbrücken, Univ., Diss., 2010