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VTETD 檢索結果共 19439 筆,本頁資料從第 229 筆到第 240 筆

The B-tree is a one of the more popular methods in use today for indexes and inverted files in database management systems. The traditional implementation of a Bâtree uses many pointers (more than one per key), which can directly affect the performance of the B-tree. A general method of file organization and access (called Dymanic Address Computation) has been descr....


By Raymond Troy West-Computer Science-VT-masters-2013-03-12
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Bovine morulae (day 6: n=257) were obtained to evaluate the [effect of immunoglobulins (Ig) on early bovine embryo development in vitro. Fiftyâfour cows superovulations were conducted in 36 cows with follicle stimulating hormone. Embryos were collected by non-surgical procedures and morphologically evaluated and randomly assigned to culture. Embryos were cultured in Ha....

By Rodolfo Canseco Sedano-Dairy Science-VT-masters-2013-03-12
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A microcomputer-based data acquisition and control system was designed for the diagnostic monitoring and control of high-speed electric motors. The system was utilized in high-speed bearing life-testing, using an electric motor as a test vehicle.

Bearing vibration and outer race temperature were continuously monitored for each ball bearing in the motor. In addit....


By Kevin Keith Moyers-Mechanical Engineering-VT-masters-2013-03-12
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The real time multitasking systems are becoming increasingly popular for control and monitoring functions typically encountered in industry as well as day to day life. They have to manage adequately many concurrent processes or tasks, each of which is sequential in nature. The concurrency is achieved by running asynchronous tasks at different speeds and providing for....


By Pradyumna Kumar Misra-Electrical Engineering-VT-masters-2013-03-12
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Environmental stress screening is used to enhance reliability by decreasing the number of failures experienced during customer use. It is suggested that added benefit can be gained by applying multiple stresses rather than a single stress, as is done presently. A further modification is to apply the stress at the assembly level, accelerating different types of compon....


By Lori Welte Seward-Industrial Engineering and Operations Research-VT-masters-2013-03-12
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In this thesis, a presentation of a new canonical representation of multi-input multioutput systems is given. The new characterization covers the full range of practical situations in linear systems according to the structural properties and model of the perturbations which are known. Its direct link to ARMA processes as well as to classical state space representatio....


By Abdelhak Bennia-Electrical Engineering-VT-masters-2013-03-12
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This thesis presents methodologies for the operation of a programming/documentation system for a Texas Instruments Model 530 programmable controller. The methodologies include: 1) a means to store information about the structure of a ladder diagram and display the ladder diagram on a CRT screen, 2) a means to convert the ladder diagram information into its equivalent....


By John Andrew Snader-Industrial Engineering and Operations Research-VT-masters-2013-03-12
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General extensions of the probability model for paired comparisons, which was developed by R. A. Bradley and M. E. Terry, are considered. Four generalizations to triple comparisons are discussed. One of these models is used to develop methods of analysis of data obtained from the ranks of items compared in groups of size three.

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By Robert Nixon Pendergrass-Statistics-VT-doctoral-2013-03-12
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In 2001, the Federal Communications Commission made available a large block of spectrum known as the 60 GHz band. The 60 GHz band is attractive because it provides the opportunity of multi-Gbps data rates with unlicensed commercial use. One of the main challenges facing the use of this band is poor propagation characteristics including high path loss and strong attenuat....

By Daniel J Jakubisin-Electrical and Computer Engineering-VT-masters-2013-02-19
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Trees, like many other organisms, decrease their rate of metabolic activities to cope up with harsh environments. This stage of âdormancyâ is marked by shedding of leaves and bud-set in deciduous trees. Recent studies have revealed the role of the circadian clock in synchronizing the timing of dormancy and physiology for conferring fitness in trees. To better understa....

By Rajesh K Bawa-Forestry-VT-masters-2013-02-18
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It is quite common practice in automotive and aircraft engine maintainence, operation, and research to employ any one of several types of instruments now on the market for determining the air-fuel ratio by exheust gas analysis. It was the purpose of this investigation to determine the most important operating characteristics, especially range and accuracy, of each of....


By John L. Dilworth-Mechanical Engineering-VT-masters-2013-02-07
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The effects of physical image quality on reading and on perceived image quality from CRT and hard copy were studied in this experiment. The results showed that as the image quality of a display increased, indicated by an increase in the value of the MTFA, the reading speed increased and subjective image quality V; ratings increased. This change in reading speed and p....


By Gerard C. Jorna-Industrial Engineering and Operations Research-VT-masters-2013-02-07
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