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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

A high voltage high vacuum test system

Scharrer, John Albert. January 1965 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1965. / eContent provider-neutral record in process. Description based on print version record. Bibliography: 2 l. at end.

An ultrahigh vacuum system

Vanandel, Hendrikus Willem H. January 1963 (has links)
An ultrahigh vacuum system has been constructed for the purpose of filling discharge tubes with gases without introduction of impurities. An ultimate pressure of 6 x 10⁻¹⁰ mm. of Hg. has been reached before filling. Two tubes have been constructed and filled with Neon without critical contamination. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

Arc distribution and motion during the vacuum arc remelting process as detected with a magnetostatic approach /

Woodside, Rigel. January 1900 (has links)
Thesis (Ph. D.)--Oregon State University, 2011. / Printout. Includes bibliographical references (leaves 80-82). Also available on the World Wide Web.

Chemical applications of ultra-high vacuum techniques

Lawrence, Charles P. January 1967 (has links)
No description available.

Towards autonomous sample positioning for ultra high vacuum chambers

Barreto, Suzana Maria January 2018 (has links)
Materials Science has in recent years become a high priority research area, having been identified as a growth sector for the UK economy over the next decade. Breakthroughs in this field are likely to have a significant impact on every area of our lives. There has recently been a trend toward automation at beamlines which is driven by rapid technology advancement. This technology advancement has improved the quality of experiment data and has allowed data collection times to improve exponentially. The Materials Science Research Group in the Institute of Mathematics, Physics and Computer Science, at Aberystwyth University have achieved international recognition for their research on materials under extreme conditions. They have a rich history in the development and use of specialist instruments to conduct real time surface analysis. Their custom made instrumentation has allowed them to greatly improve experiment throughput. Automation of the group's ultra high vacuum chambers is therefore a further enhancement that is advantageous, important, necessary and inevitable. This thesis presents the research undertaken to study what is required to provide automated sample positioning inside vacuum chambers that are operated under ultra high vacuum conditions, as the first step towards automation. As part of the research, a prototype automated positioning system that employs state of the art model based visual tracking techniques was developed to gain an understanding of the challenges the ultra high vacuum environment presents. Experimentation was carried out to assess the effects of different lighting conditions on tracking, evaluate the tracking library, extract suitable extrinsic parameters for tracker initialisation, and evaluate both monocular and stereo mode tracking. Key findings were that the model based tracking is a suitable approach for an automated positioning system but that performance depends on having suitable port placement for the cameras. Stereo tracking provided the best performance but was still prone to divergence at certain relative positions of the manipulator. On linear runs the average error was 0.06mm. On rotational runs, anti-clockwise runs proved better with an average error of 2<sup>o</sup> to 3<sup>o</sup>. The high errors of mixed rotational and linear tracking runs did not match the visual outputs indicating that there were inherent errors in the data evaluation. Tracking output video footage is available at [8]. More work is needed to take the system forward and close the tracking loop. Recommendations for improvements were provided.

Vacuum removal of copper from liquid steel

Harris, Ralph L. January 1978 (has links)
No description available.

Design and construction of a vacuum furnace

Brennan, Joseph Xavier 08 1900 (has links)
No description available.

An analysis of third order intermodulation in vacuum tubes

Propp, Robert Rubel 08 1900 (has links)
No description available.

Investigating arc behavior in a DC vacuum arc remelting furnace using magnetic flux density measurements /

Woodside, Rigel. January 1900 (has links)
Thesis (M.S.)--Oregon State University, 2008. / Printout. Includes bibliographical references (leaves 85-86). Also available on the World Wide Web.

Theory of vacuum tube amplifiers

Miller, Burton Frank. January 1929 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1929. / Typescript. eContent provider-neutral record in process. Description based on print version record.

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