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VTETD 檢索結果共 19439 筆,本頁資料從第 205 筆到第 216 筆

Wigner distribution is considered to be one of the most powerful tools for time-frequency analysis of rumvstationary signals. Wigner distribution is a bilinear signal transformation which provides two dimensional time-frequency characterization of one dimensional signals. Although much work has been done recently in signal analysis and applications using Wigner distr....


By Siuling Cheng-Electrical Engineering-VT-masters-2013-03-12
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The present study assessed the relationship between the paternal use of food in a contingency manner and the physical status of the respective son.

The prevalence of childhood obesity has been documented to be significant in this country (Mayer, 1968; Collipp, 1975; Forbes, 1975; Hafen, 1981). The etiology of the increasing percentages of obese children is bas....


By Caren Frigge-Human Nutrition and Foods-VT-masters-2013-03-12
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Field experiments with the green peach aphid on tobacco were conducted at Blackstone, Virginia in 1983 and 1984. The objectives were to: 1) confirm and identify source materials resistant to the green peach aphid; 2) study the inheritance of aphid resistance; 3) verify heritability of resistant genotypes through F2 and advanced generation testing and 4) investigate t....


By Clark D. Hinga-Agronomy-VT-masters-2013-03-12
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This study investigated the potential use of wide skidder tires for forest harvesting operations on steep slopes. During the summer of 1984, field tests were conducted to compare the performance characteristics of 24.5-32 and 66-43 rubber tires on a JD-640 grapple skidder loaded with tree length material. The skidder was operated on 20%, 25% and 30% slopes on Piedmon....


By Chengxian Gao-Forestry-VT-masters-2013-03-12
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Recent improvements in speech technology have made synthetic speech a viable I/O alternative. However, little research has focused on optimizing the various speech parameters which influence system performance. This study examined the effects of speech rate, message repetition, and the placement of information in a message. Briefly, subjects heard messages generated ....


By Monica Ann Merva-Industrial Engineering and Operations Research-VT-masters-2013-03-12
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The purpose of this thesis is to provide a complete package for the design and three dimensional modeling display of cams.

The software produced as a part of this work will operate as a module of CADAM to produce cam designs and enter the resulting cam as a CAD model and produce the graphical display of the cam.

In addition to the introductory materia....


By Ashit R. Gandhi-Mechanical Engineering-VT-masters-2013-03-12
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In recent studies, caloric intakes among female distance runners were reported to be insufficient to support training intensities. To study energy intake and expenditure in female collegiate distance runners, ten members of the Virginia Tech cross-country team were utilized as subjects.

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By Jeanne Ann Braddick-Human Nutrition and Foods-VT-masters-2013-03-12
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Many existing Piedmont hardwood stands are composed of trees that are larqely under 45 cm in diameter and contain a desirable oak component, as well as larqe amounts of undesirable red maple and sourwood. In stands under evenaqed silviculture, season of harvest can be used as an effective manaqenent tool to favor different species compositions. If oak or other hardwo....


By Jonathan Kays-Forestry-VT-masters-2013-03-12
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The effects of grazing by the small oligochaete, Aeolosoma, on periphyton assemblages of different algal composition and on unconditioned detritus were examined. Natural water and periphyton inoculum were collected from a littoral environment and used to construct laboratory microcosms. Changes in algal community composition, microbial respiration, and structural ind....


By Jay L. Garland-Zoology-VT-masters-2013-03-12
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Floc density measurements may play a significant role in analyzing sludge dewatering characteristics. A laboratory technique was developed to measure this property by means of isopycnic centrifugation. Four laboratory sludges were subjected to a series of dewatering tests: gravity thickening, centrifugation, vacuum filtration, and highâpressure dewatering. Each slud....


By Catherine E. Arundel-Environmental Engineering-VT-masters-2013-03-12
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Forty-two high producing Holstein cows were paired by body condition and mature equivalent milk production and fed either a high or low energy complete ration ad libitum during the last 16-20 weeks of lactation. Cows fed the high energy ration ate more feed, produced more milk and gained more body condition than cows fed the low energy ration. Cows were fed to mainta....


By William Matthew Seymour-Dairy Science-VT-masters-2013-03-12
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Prepartum, multiparous ewes were randomly assigned to experimental groups and sacrificed at 50(n=5), SO(n=4),115(n=5), and 140(n=4) days of gestation. Serum harvested the week prior to slaughter was assayed for progesterone (PG), prolactin (PRL) and growth hormone (GH) concentrations. Mammary tissue obtained at slaughter was assayed for receptor concentrations of pro....


By James Joseph Smith-Dairy Science-VT-masters-2013-03-12
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