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VTETD 檢索結果共 19439 筆,本頁資料從第 133 筆到第 144 筆

An experimental investigation was performed to measure Reynolds stresses in the turbulent flow downstream of a large-scale linear turbine cascade. A rotatable X-wire hot-wire probe that allows redundant data to be taken with solution for mean velocities and turbulence quantities by least-squares fitting procedures was developed. This measurement technique was verified i....

By Damon M. Shaffer-Mechanical Engineering-VT-masters-2013-11-15
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The method of singularâperturbation analysis is applied to the determination of range-fuelâtime optimal aircraft trajectories. The problem is shown to break down into three sub-problems which are studied separately. In particular, the inner layer containing the altitude path-angle dynamics is analyzed in detail. The outer solutions are discussed in an earlier work.....

By Uday J. Shankar-Aerospace Engineering-VT-masters-2013-11-15
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Relationships among glucose tolerance, plasma insulin, and plasma glucagon were examined in chicks developed through selection for high (HW) and low (LW) body weight, and in F1 crosses (HL) between HW males and LW females. At 21, 42, 63, and 84 days of age, chicks from each population were intubated with glucose (2 g/kg body weight) following a 24-hr fast. Blood was col....

By Nancy A. Sinsigalli-Accounting and Information Systems-VT-masters-2013-11-15
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The evolution and relative importance of four issues -- civic boosterism and community autonomy, public services and planning, financial considerations, and race-related considerations -- were examined and analyzed as critical factors in Roanoke, Virginia's historic use of annexation. Particular attention was paid to the 1943, 1949, and 1962 annexation suits because ....


By Leslie F. Smith-Geography-VT-masters-2013-11-15
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The main objective of this research effort was the construction of a finger valve dynamics model using simplified theory based on steady flow conditions. The analytical valve positions were then compared to experimental measurements from an Ingersoll Rand model 242 two-stage air compressor. Proximity probes were used to measure the valve position at two points on the ex....

By Antonio Spagnuolo-Mechanical Engineering-VT-masters-2013-11-15
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The potential of inbreeding and selective hybridization, along with anther culture, for increasing homogeneity with 2 early flowering cultivars of Streptocarpus X hybridus was examined. A 'Concorde' and 'Mixed Nymph' genotype expressed inbreeding depression within 2 generations, characterized by a reduction in corolla, leaf, and peduncle size, as well as an incre....

By David W. Wolff-Horticulture-VT-masters-2013-11-15
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The instability of flows around hump and dip imperfect1ons is invest1gated. The mean flow is calculated using interacting boundary layers, thereby accounting for viscous/inviscid 1nteraction and separation bubbles. Then, the two-dimensional linear instability of this flow is analyzed, and the amplification factors are computed. Results are obtained for several height/wi....

By Ayman Adnan Al-Maaitah-Engineering Science and Mechanics-VT-masters-2013-11-15
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Thirty multiparous Holstein and twelve multiparous Jersey cows were used to determine effect of diets (3x2 factorial) containing 0,1,2 kg of fish meal (FM) and energy levels of 70 and 75% TDN on milk production and composition. Basal diets contained 83% corn silage and 10.3% concentrate for the 70% TDN ration and 60% corn silage, 10.3% concentrate and 24.5% high moistur....

By Mario D. Alvarado-Dairy Science-VT-masters-2013-11-15
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Conditioning studies were conducted on several water and wastewater sludges using polymers to determine the effect of high-intensity mixing on floc formation and breakup. Mechanisms acting in particle coagulation were also investigated. A rapid mixing apparatus was used in conditioning the sludge to simulate the high velocity gradients encountered in most dewatering equ....

By Nazih Bandak-Civil Engineering-VT-masters-2013-11-15
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An experimental investigation on an uncooled choked plasma torch using hydrogen/argon mixtures as a propellant was conducted. This low-power plasma torch was designed to be used as an ignitor and flameholder in supersonic combustion. The anode and cathode were made of two-percent thoriated tungsten, and no cooling system was required. Sonic flow through the nozzle wa....


By Eric Barbi-Mechanical Engineering-VT-masters-2013-11-15
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TWTAs (Traveling Wave Tube Amplifiers) are presently the primary life-limiting element of a communications satellite transponder. Satellite operators rely on spare TWTAs to ensure that most of the transponders will be operating at the spacecraft end-of-life. We wish to track the "health" of the operating TWTAs in order to accurately predict the remaining useful lifetime....

By Thomas Andrew Beachem-Electrical Engineering-VT-masters-2013-11-15
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This study investigates an adaptive control scheme designed to maintain accurate motor speed control in spite of high-frequency periodic variations in load torque, load inertia, and motor parameters. The controller adapts, stores and replays a schedule of torques to be delivered at discrete points throughout the periodic load cycle. The controller also adapts to non-per....

By Jeffery C. Beall-Mechanical Engineering-VT-masters-2013-11-15
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