Thesis (M.S.)--University of Wisconsin--Madison. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 92).

Thesis (M.S.)--University of Wisconsin--Madison, 1984. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 87-88).

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Thesis (M.S. in electrical engineering)--Washington State University, August 2008. / Title from PDF title page (viewed on Mar. 11, 2009). "School of Electrical Engineering and Computer Science." Includes bibliographical references (p. 48-49).

High voltage direct current. (hvdc) transmission of electrical paver has been made possible with the recent advent of multi-anode mercury arc valves with grading electrodes. However, mercury are valves do suffer from random phenomena such as arcback, which requires special bracing for the converter transformer. In addition, mercury arc valves need considerable auxiliaries, including cooling and vacuum plants. Research and development directed towards the improvement in the voltage and current capabilities of thyristors are yielding encouraging results. In contrast to mercury arc valves, thyristors do not suffer from random phenomena and require minim auxiliaries. Considering these advantages, thyristors offer a viable alternative to mercury arc valves for hvdc converters. The comparatively low ratings of thyristors necessitate series and parallel connection of thyristors in order to construct a valve of sufficient rating for hvdc operation. The design of thyristor valve should ensure even distribution of voltage and current among all thyristors of the valve, during all operating conditions. To achieve this objective transmission of the firing signal to the gate of each thyristors should have good coherence. The thesis examines design aspects, and considers the different methods of firing both theoretically and practically. Finally, the design and subsequent experimental results of the prototype thyristors valve rated at 10kv and 10A are also included.

No description available.

Endohedral metallofullerenes have special structures, therefore we are interested in. High-temperature laser vaporization method and direct current arc discharge method, which are the two methods for preparing endohedral metallofullerenes. Here we study the preparation of endohedral metallofullerenes by direct current arc discharge method, which uses two graphite rods as electrode and vaporizes the one which infill metal complex in high temperature and low helium gas pressure environment. We study in some metal complexes such as Mo(C5Ph5)2, Fe(CO)9, Ag and Au. After reaction, we collect the soot produced in reaction and choose different solvents to separate the products from it with Soxhlet extraction.

Thesis (M.S. in electrical engineering)--Washington State University, December 2009. / Title from PDF title page (viewed on Jan. 15, 2010). "School of Electrical Engineering and Computer Science." Includes bibliographical references (p. 52-53).