Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2005. / Includes bibliographical references (leaves 54-56). Also available in electronic version.

Thesis (M.S.) -- University of Texas at Dallas, 2006 / Includes vita. Includes bibliographical references (leaves 68-71)

Thesis (M.E.)--University of Florida, 2003. / Title from title page of source document. Includes vita. Includes bibliographical references.

Thesis (MScIng)--University of Stellenbosch, 2005. / Bibliography. Also available via the Internet.

The purpose of this thesis is to design, develop, implement and test a novel soft-switching inverter topology suitable for switched reluctance motor drives. Present research being done in the field of switched reluctance motor drive inverters, including soft-switching inverters, is discussed. The novel topology is presented and the principle of operation is described in detail. The validity of the topology is verified through simulation. The various components of the system are designed and the hardware implementation is presented. Experiments carried out to verify the operation of this inverter are explained. Results are presented and comparison is made between hard switching and soft switching inverter topologies. Conclusions are drawn regarding the effectiveness of the proposed topology. / Master of Science

Bilingualism is one of the by-products of globalization and migration. As people from different ethnicities come into contact, their languages will influence each other. People learn a second or third language in different environments leading to their linguistic proficiency levels being different. In conversations involving bilinguals, code-switching may be prevalent. This practise of alternating between two or more languages during a speech act has been of great interest to researchers with various models and hypotheses being proposed to explain it. Although code-switching has been studied extensively in literature, indigenous languages such as Shona have received less attention. This study aims to determine whether the markedness model of code-switching can be applied to Shona oral discourse (speech). An analysis is done to ascertain the nature, occurrence and characteristics of code-switching in the speech of Shona-English bilinguals. Participants who attended formal education for at least ten years were selected for the study. In order to inform on the theoretical background and on previous studies that dealt with code-switching, a literature review was conducted. The study used semi-structured interviews, a cloze test and recordings as data collection methods. Data was analysed to determine the applicability of the markedness model to the compiled corpus. Data analysis was also aided by WordSmith, (corpus analysis software). Results of the analysis seem to suggest that the markedness model can be applied to Shona-English code-switching. In addition, an analysis of the corpus using WordSmith showed frequently used English words and collocations and concordances of the code-switched words. An examination of the collocations and concordances shows the contexts in which the code-switched words appear. / Dissertation (MA) University of Pretoria, 2016. / National Research Foundation (NRF) / Afrikaans / MA / Unrestricted

No description available.

The insulation of the high voltage power cable will be placed under higher electrical stress by switching surges during the power system operation. The switching surge weakens the power cable insulation and it leads to failure of cables. It has a significant effect on the aging of the insulation material that affects the lifetime of the power cables. This research studies the electrical degradation of 15 kV XLPE and EPR power cables insulation by applying 100, 500, 1000 and 5000 switching impulses of 100 kV. The status of the polymer cable insulation aging is evaluated by the measurement of partial discharge level and ac breakdown voltage. Partial discharge measurements are taken throughout the aging process at specific intervals of applied impulses. The ac breakdown voltage is also measured at the end of the accelerated aging process.

No description available.

No description available.