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Thesis (Ph. D.)--University of Texas at Austin, 2007. / Vita. Includes bibliographical references.

published_or_final_version / Electrical Engineering / Master / Master of Philosophy

Thesis (PhD (Electrical Engineering))--Cape Peninsula University of Technology, 2018. / The generation of electricity through the conventional conversion system such as thermal and hydroelectric plants may no longer be sufficient to meet the increasing demands and usage. One of the major reasons for shortage supply of electric power is due to the lack of fossil fuel and other conventional resources that are currently being used in Africa. In addition, the conversion process of the conventional system often causes pollution which contributes to global warming. Therefore, there is a need for this research to develop novel and alternative methods of generating electric power. Among these methods is the Magnetohydrodynamics (MHD) conversion system, which is a direct energy conversion system. In this system, plasma or ionised gas is directly converted into electric power with generating efficiency of about 62 %. The conversion process of the MHD system is based on the principle of Faraday’s Law of electromagnetism and fluid dynamics. The focus of the present study is to investigate alternative methods through which an MHD power generator can be coupled to the existing thermal plants in South Africa. In doing so, the thermal cycle efficiency of these conventional plants can be improved. Another goal of this study is to investigate the behaviour of an MHD generator prototype under exposure to plasma through simulation and experimentation in a laboratory setting.

Tang Siu Kei. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references (leaves 107-111). / Abstracts in English and Chinese. / Acknowledgements --- p.ii / Abstract --- p.iii / List of Figures --- p.xi / List of Tables --- p.xvi / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Overview of Electrostatic Discharge --- p.1 / Chapter 1.1.1 --- Classification of Electrostatic Discharge Models --- p.1 / Chapter 1.2 --- Electrostatic Discharge in CMOS RF Circuits --- p.4 / Chapter 1.3 --- Research Goal and Contribution --- p.6 / Chapter 1.4 --- Thesis Outline --- p.6 / Chapter Chapter 2 --- Performance Parameters of Amplifier --- p.8 / Chapter 2.1 --- Amplifier Gain --- p.8 / Chapter 2.2 --- Noise Factor --- p.9 / Chapter 2.3 --- Linearity --- p.11 / Chapter 2.3.1 --- 1-dB Compression Point --- p.13 / Chapter 2.3.2 --- Third-Order Intercept Point --- p.14 / Chapter 2.4 --- Return Loss --- p.16 / Chapter 2.5 --- Power Consumption --- p.18 / Chapter 2.6 --- HBM ESD Withstand Voltage --- p.19 / Chapter Chapter 3 --- ESD Protection Methodology for Low Noise Amplifier --- p.21 / Chapter 3.1 --- Dual-Diode Circuitry --- p.22 / Chapter 3.1.1 --- Working Principle --- p.22 / Chapter 3.1.2 --- Drawbacks --- p.24 / Chapter 3.2 --- Shunt-Inductor Method --- p.25 / Chapter 3.2.1 --- Working Principle --- p.25 / Chapter 3.2.2 --- Drawbacks --- p.27 / Chapter 3.3 --- Common-Gate Input Stage Method --- p.28 / Chapter 3.3.1 --- Built-in ESD Protecting Mechanism --- p.29 / Chapter 3.3.2 --- Competitiveness --- p.31 / Chapter Chapter 4 --- Design Theory of Low Noise Amplifier --- p.32 / Chapter 4.1 --- Small-Signal Modeling --- p.33 / Chapter 4.2 --- Method of Input Termination --- p.33 / Chapter 4.2.1 --- Resistive Termination --- p.34 / Chapter 4.2.2 --- Shunt-Series Feedback --- p.34 / Chapter 4.2.3 --- l/gm Termination --- p.35 / Chapter 4.2.4 --- Inductive Source Degeneration --- p.36 / Chapter 4.3 --- Method of Gain Enhancement --- p.38 / Chapter 4.3.1 --- Tuned Amplifier --- p.38 / Chapter 4.3.2 --- Multistage Amplifier --- p.40 / Chapter 4.4 --- Improvement of Reverse Isolation --- p.41 / Chapter 4.4.1 --- Common-Gate Amplifier --- p.41 / Chapter 4.4.2 --- Cascoded Amplifier --- p.42 / Chapter Chapter 5 --- Noise Analysis of Low Noise Amplifier --- p.44 / Chapter 5.1 --- Noise Sources of MOS Transistor --- p.44 / Chapter 5.2 --- Noise Calculation using Noisy Two-Port Network --- p.46 / Chapter 5.3 --- Noise Calculation using Small-Signal Model --- p.49 / Chapter 5.3.1 --- Low Noise Amplifier with Inductive Source Degeneration --- p.49 / Chapter 5.3.2 --- Common-Gate Low Noise Amplifier --- p.52 / Chapter Chapter 6 --- Design of an ESD-protected CMOS Low Noise Amplifier --- p.54 / Chapter 6.1 --- Design of DC Biasing Circuitry --- p.55 / Chapter 6.2 --- Design of Two-Stage Architecture --- p.57 / Chapter 8.3.1 --- Design of Common-Gate Input Stage --- p.57 / Chapter 8.3.2 --- Design of Second-Stage Amplifier --- p.59 / Chapter 6.3 --- Stability Consideration --- p.61 / Chapter 6.4 --- Design of Matching Networks --- p.62 / Chapter 6.4.1 --- Design of Inter-Stage Matching Network --- p.64 / Chapter 6.4.2 --- Design of Input and Output Matching Networks --- p.67 / Chapter Chapter 7 --- Layout Considerations --- p.70 / Chapter 7.1 --- MOS Transistor --- p.70 / Chapter 7.2 --- Capacitor --- p.72 / Chapter 7.3 --- Spiral Inductor --- p.74 / Chapter 7.4 --- Layout of the Proposed Low Noise Amplifier --- p.76 / Chapter 7.5 --- Layout of the Common-Source Low Noise Amplifier --- p.79 / Chapter 7.6 --- Comparison between Schematic and Post-Layout Simulation Results --- p.81 / Chapter Chapter 8 --- Measurement Results --- p.82 / Chapter 8.1 --- Experimental Setup --- p.82 / Chapter 8.1.1 --- Testing Circuit Board --- p.83 / Chapter 8.1.2 --- Experimental Setup for s-parameter --- p.84 / Chapter 8.1.3 --- Experimental Setup for Noise Figure --- p.84 / Chapter 8.1.4 --- Experimental Setup for 1-dB Compression Point --- p.85 / Chapter 8.1.5 --- Experimental Setup for Third-Order Intercept Point --- p.86 / Chapter 8.1.6 --- Setup for HBM ESD Test --- p.87 / Chapter 8.2 --- Measurement Results of the Proposed Low Noise Amplifier --- p.89 / Chapter 8.2.1 --- S-parameter Measurement --- p.90 / Chapter 8.2.2 --- Noise Figure Measurement --- p.91 / Chapter 8.2.3 --- Measurement of 1-dB Compression Point --- p.92 / Chapter 8.2.4 --- Measurement of Third-Order Intercept Point --- p.93 / Chapter 8.2.5 --- HBM ESD Test --- p.94 / Chapter 8.2.6 --- Summary of Measurement Results --- p.95 / Chapter 8.3 --- Measurement Results of the Common-Source Low Noise Amplifier --- p.96 / Chapter 8.3.1 --- s-parameter Measurement --- p.97 / Chapter 8.3.2 --- Noise Figure Measurement --- p.98 / Chapter 8.3.3 --- Measurement of 1-dB Compression Point --- p.99 / Chapter 8.3.4 --- Measurement of Third-Order Intercept Point --- p.100 / Chapter 8.3.5 --- HBM ESD Test --- p.101 / Chapter 8.3.6 --- Summary of Measurement Results --- p.102 / Chapter 8.4 --- Performance Comparison between Different Low Noise Amplifier Designs --- p.103 / Chapter Chapter 9 --- Conclusion and Future Work --- p.105 / Chapter 9.1 --- Conclusion --- p.105 / Chapter 9.2 --- Future Work --- p.106 / References --- p.107 / Author's Publications --- p.112

Advancements in power electronics to higher power levels and faster switching times allow new machine and systems designs, but also create higher stresses on electric machinery insulation. High performance, pulse-width modulated (PWM) inverters are now available for medium voltage drive systems, and are being considered by the U.S. Navy as they move to the "all-electric" ship. If this process is to be successful, a necessary component will be to understand the impact of partial discharge (PD) generation on electric drive systems. Out of the many PD influencing parameters, voltage level, voltage rise-time, switching frequency, and temperature were chosen to be investigated with regards to their influence on PD generation in a comprehensive research project in the Motor Systems Research Facility (MSRF) at Oregon State University (OSU). The tests were performed on representative propulsion coils employing two different 4160 V insulation systems and were evaluated by both an optical and electrical PD detection method. A highly flexible test configuration was developed, capable of adjusting each of the four test parameters independently over a wide range of appropriate values. The developed test program enabled the analysis of the influence of the parameters on the generation of PD, as well as an evaluation of the test coils and PD instrumentation used. It is concluded that, as expected, voltage level is the most significant parameter affecting PD production. However, there is a surprising interdependence of rise-time and pulse-width that requires further investigation. Multiple-cycling tests are seen as appropriate to determine the effect of temperature. Based on the subjective nature of the findings from the test program an improved PD instrument is proposed, which would increase the capabilities and objectivity of the PD detection process. / Graduation date: 2004

Sanborn C. Brown. / "July 25, 1955." "This report is identical with material prepared for Handbuch der Physik, Volume XXII, 1955." / Includes bibliographical references. / Army Signal Corps Contract DA36-039 sc-42607 Project 132B Dept. of the Army Project 3-99-12-022

Sanborn C. Brown, W.P. Allis. / "June 9, 1958." / Includes bibliographies. / Army Signal Corps Contract DA36-039-sc-64637. Dept. of the Army Task 3-99-06-108 and Project 3-99-00-100.

W.P. Allis [and] Sanborn C. Brown. / "April 23, 1952." / Bibliography: p. 13. / Army Signal Corps Contract No. DA 36-039 sc 100. Project no. 8-102B-0. Dept. of the Army Project no. 3-99-10-022.

A.D. McDonald, Sanborn C. Brown. / "August 3, 1949." / Bibliography: p. 6. / Army Signal Corps Contract No. W36-039-sc-32037 Project No. 102B Dept. of the Army Project No. 3-99-10-022