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VTETD 檢索結果共 19439 筆,本頁資料從第 97 筆到第 108 筆

The purpose of the investigation was to determine if coliform organisms isolate on membrane filters can be incubated at a humidity below the point of saturation.

The investigation consisted of comparing the development of coliform organisms on membrane filters incubated at various controlled levels of humidity with the development of coliform organisms incuba....


By Jack Fagg Neel-Sanitary Engineering-VT-masters-2013-11-15
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The purpose of this study was to evaluate the ability of typical cation and anion exchange resins to remove Escherichia coli from water. The objective was to obtain a method of purifying slightly polluted, private well water supplies.

The investigation consisted of passing water samples, inoculated with known concentrations of Escherichia coli, through resin ....


By Thomas Jackson Blair-Sanitary Engineering-VT-masters-2013-11-15
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An r-f ion source has been constructed for the V.P.I. electrostatic generator. The ion source has been in operation for approximately one thousand hours with an average beam current of one micro-ampere. This been has been sufficient to test and calibrate the accelerator.

Experiments which require bean currents in the order of 100 micro-amperes can now be condu....


By John Thaddeus Rogers-Physics-VT-masters-2013-11-15
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A subcritical heteregeneous nuclear reactor was designed and constructed for use in the nuclear engineering program at Virginia Polytechnic Institute. Natural uranium fuel and reactor grade graphite were used as building materials,....

By Thomas McKinley Schuler-Nuclear Engineering Physics-VT-masters-2013-11-15
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By Jean Gibson Swartz-Biology-VT-masters-2013-11-15
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Cottontail management on large non-agricultural blocks of land should be directed toward supplying herbaceous-type food and breaking up large homogeneous cover types.....

By Donald Keith Fortenbery-Biology-VT-masters-2013-11-15
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Experiments have been performed to determine the susceptibility of AISI 304 to stress-corrosion cracking in boiling magnesium chloride solutions in terms of time to crack nucleation and rate of crack propagation. ....

By Jay Patrick Higgins-Metallurgical Engineering-VT-masters-2013-11-15
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Experimental investigations have been conducted to determine the type of nitride which is formed in Type 304 stainless steel. On the strength of X-ray diffraction and metallographic investigations, it is concluded that nitrogen combines principally with iron in thin alloy forming a combination of iron nitrides: Fe4N, and Fe3N, and Fe2....


By Charles Warren Fox-Metallurgical Engineering-VT-masters-2013-11-15
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The purpose of this thesis is to approach a partial theoretical understanding of the design of lamella structures and to determine the economic merit of the lamella structure as a structural steel hangar.

A survey revealed no literature that discusses the design of lamella past the concept that the lamella could be designed as independent arches.

In th....


By John K. Groseclose-Architectural Engineering-VT-masters-2013-11-15
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The broad problem of coal bed degasification of which this study is a small part, deserves attention for the following reasons: (1) Mine personnel safety, (2) Economical recovery of the gas. Physically, the gas is liberated in the coal mines because of two conditions. These are:(1) somewhere in the coal bed itself, the gas is under a force or pressure which is larger....


By Shiun Ming Koo-Mining Engineering-VT-masters-2013-11-15
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This study, concerned with evaluation of Cottontail Rabbit management techniques, was conducted at Camp Pickett, Virginia, a 47,000-acre deactivated military reservation. This public hunting area is managed cooperatively by the U. S. Second Army and the Virginia Commission of Game and Inland Fisheries. Cottontail Rabbit populatien fluctuations were measured by roadside ....

By Alan Scott Krug-Biology-VT-masters-2013-11-15
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This study has dealt with the rural county of Virginia within the definition basically established by the United States Bureau of the Gensus. The particular item of interest is the developmental pattern and resulting implications occurring in the rural county. A proposal is presented that will develop a knowledge of planning for the citizenry. In addition, a method of a....

By Raymond Hall Hayworth-City and Regional Planning-VT-masters-2013-11-15
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