In this study, a particle welding tester has been employed to weld the 500 £gm diamond particle coated copper on the aluminum workpiece surface. The DC power supply is used as the welding energy to weld. The resistance material is added into the interface between the electrode and the diamond particle. Hence the welding energy can transfer from the diamond particle to aluminum surface so that the aluminum softens and the diamond particle is embedded into the surface under the applied force. In this experiment, the effects of the applied force (2-20 N), power (13-35 W) on the welding pattern and the behavior of welding interface. When the silicon carbide is used as the resistance material, the weld able region map is established in terms of the applied force and power. The map is divided into the insufficient heat input, the normal welding and the excess heat input. In the insufficient heat input region the power is less than 20 W, and the diamond can not be embed into the workpiece surface because the power is not enough. In the normal welding region, the power is in the range between 20 to 30 W, where the welding quality is quite good. In the excess heat input region, the power is greater than 30 W, where the welding quality is poor because the blowhole and the gas hole are generated on the surface. In the normal welding region, the embedded depth can be controlled by the different force during welding process.

Thesis (Honors)--Liberty University Honors Program, 2008. / Includes bibliographical references.

Thesis (Ph. D.)--Rutgers University, 2009. / "Graduate Program in Biochemistry." Includes bibliographical references (139-146).

Thesis (PhD (Paraclinical Sciences, Veterinary Science))--University of Pretoria, 2009. / Includes bibliographical references. Also available in print format.

Thesis (PhD.(Plant Science))-University of Pretoria, 2009. / Summary in English. Includes bibliographical references.

Thesis (Ph. D.)--University of Hong Kong, 1986.

The Road Less Traveled is about engaging film from a geographic perspective, specifically analyzing the underlying structures, cultural contexts and forces affecting the movements of the two main protagonists of the film The Motorcycle Diaries. The focus at the individual scale aims to reveal not just how and where, but why people chose to move where they do. The paper is divided into five main chapters: mobility as resistance, mobility as structured process in the form of motility and moorings, forced mobility as distinctive from chosen mobility, mobility as discovery and a final body chapter that demonstrates examples of all these types of mobility. These sections will mainly flow as neoformal, mostly chronologic descriptions of the film text, but will also occasionally reference the written text of the two diaries on which the movie is based. While the main character of the film is Che Guevara, no attention will be dedicated to his revolutionary life outside of the time frame encompassed by the film. / text

published_or_final_version / Pharmacology and Pharmacy / Doctoral / Doctor of Philosophy

published_or_final_version / Public Health / Master / Master of Public Health

published_or_final_version / Public Health / Master / Master of Public Health