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Dissertations / Theses on the topic 'LD5655.V851 1991.K758'

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Published: 4 June 2021

Last updated: 6 February 2022

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1

Kriss, Sheryl Kay. "Computerized simulations for introductory geography instruction : international population /." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01202010-020245/.

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2

Krishnamurthy, Ravi S. "Enhanced intersection cutting plane and reformulation-linearization enumeration based approaches for linear complementarity problems." Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/38573.

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In this research effort, we consider the linear complementarity problem (LCP) that arises in diverse areas including optimal control, economics, engineering, mechanics, and quadratic programming. This class of problems has posed a challenge to researchers for over three decades now. Most of the current algorithms designed to solve LCP are guaranteed to work only under some restrictive assumptions on the matrix <i>M</i> associated with LCP. In this research, we introduce two new algorithms based on an equivalent 0-1 mixed integer bilinear programming formulation of LCP. In the first approach, we develop an enhanced intersection cutting plane algorithm for solving LCP. The matrix <i>M</i> is not assumed to possess any special structure, except that the corresponding feasible region is assumed to be bounded. A procedure is described to generate cuts that are deeper versions of Tuy's intersection cuts, based on a relaxation of the usual polar set. The proposed algorithm then attempts to find an LCP solution in the process of generating either a single or a pair of such strengthened intersection cuts. The process of generating these cuts involves a vertex ranking scheme that either finds an LCP solution, or else, these cuts eliminate the entire feasible region leading to the conclusion that no LCP solution exists. Based on the bilinear formulation, a heuristic is also proposed to front-end the algorithm, in order to possibly solve LCP. In the second part of the dissertation, we present a global optimization algorithm based on a novel Reformulation-Linearization Technique (RLT). We do not place any restrictions on the matrix M associated with LCP in this case. This RLT scheme provides an equivalent linear, mixed integer programming formulation of LCP, that possesses a tight linear programming relaxation. The solution strategy developed is a composite impliCit enumeration-Lagrangian relaxation scheme. In addition to the bounds provided by the RLT-based relaxation, we further tighten these bounds at each node of the branch-and-bound tree through the use of strongest surrogate cuts, and strengthened intersection cuts. The heuristic developed in the previous algorithm is also invoked within this scheme. Both algorithms have been implemented and tested on randomly generated test problems. These problems include both indefinite and negative definite defining matrices. The results of these tests indicate that both methods are effective in solving the LCP with the heuristic being quite effective in recovering LCP solutions when the matrix Mis negative definite. The Lagrangian dual approach for the implicit enumeration scheme proved to be computationally more efficient than a similar simplex based lower bounding scheme.<br>Ph. D.

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3

Kruithof, Pieter Cornelius. "Evaluation of wrist posture during the operation of four electromechanical mice." Thesis, Virginia Tech, 1995. http://hdl.handle.net/10919/41080.

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<p>This research investigated the effect of mouse support height, mouse type, and hand length on the wrist posture of computer mouse operators. Mouse support height was defined as the distance from the floor to the horizontal surface on which the mouse is supported and divided into three levels: 95%, 100%, and 105% of the seated elbow height. The levels of mouse type were the Logitech MouseMan, Kensington Thinking Mouse, Apple Desktop Bus Mouse, and the Apple Desktop Bus Mouse II. Hand size was defined as the distance from the stylion landmark on the right hand to the tip of the middle finger. The twenty-four subjects were divided into three groups of eight according to hand size (small, medium, and large).</p> <p> The average distance in degrees from neutral was calculated for the first set of dependent measures. Results showed that an increase in the mouse support height caused a decrease in the amount of wrist extension and an increase in the amount of ulnar deviation for both pointing and dragging tasks. There was also a significant interaction between mouse support height and hand size for wrist extension during pointing tasks.</p> <p> Mouse type and hand size were not found to be significant as main effects in either pointing or dragging tasks. It was probable that the differences in the physical characteristics of either the userfs hands or of the mice were not great enough to affect the posture of the user.</p> <p>For the second set of dependent measures, wrist posture was divided into intervals that ret1ect the severity of posture. Mouse support height was found to significantly affect the amount of time spent in different posture intervals. The remaining independent variables did not significantly effect these dependent measures.</p><br>Master of Science

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4

Krishnamurthy, Karthik Chandran. "Effects of temperature on the electrical impedance of piezoelectric elements." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-02132009-172015/.

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5

Brendlinger, Robert Lee. "Toxicity analysis of coal mining industry NPDES discharges in Southwest Virginia." Master's thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/40599.

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Industrial toxicity has become a major environmental subject over the past decade. Although much research and data have been collected and published for the manufacturing type industries, minimal data is currently available concerning the possible toxics that may be associated with coal mining industry NPDES discharges. Thus, in this report, an environmental toxicity assessment with respective data shall be presented on the three major constituent sectors of the coal mining industry in Southwest Virginia of which includes mines, preparation plants and refuse facilities. The mines category shall include both surface and underground facilities. The preparation plants sector will cover the traditional railroad siding loadout type facilities, along with the modern clean coal processing preparation plants. Valley and side fill configuration, coarse and combined refuse fills and coal refuse impoundments shall be presented in the refuse facility categorization. Reference source data and specific information from a Virginia Coal Association Taxies Monitoring Program study are presented to show that the effects of toxicity in the coal mining associated NPDES effluents are minimal and not a serious problem. The conclusions of this report shall show that through enforcement of better management practices within the coal industry in Southwest Virginia that toxicity can be virtually eliminated in NPDES outfalls.<br>Master of Science

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6

Lim, Christina Go. "Synthesis and characterization of poly(oxazoline) rotaxanes and literature review on separation, detection and identification of cyclic oligomers in poly(ethylene terephthalate) and poly(ε-caprolactam)". Master's thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/40712.

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Several methods have been developed to determine the cyclic oligomer content in PET. Isolation procedures can be classified as those involving extraction, such as with solvents like chloroform, dioxane, and xylene, and those involving dissolution followed by precipitation in solvents like dimethylformamide and 1-methylnaphthalene. The amount of cyclic oligomer obtained is largely dependent upon the method used, as well as the type, drawing, and thermal history of the PET used.Various methods for separation of cyclic oligomers have also been developed using GPC and thin-layer chromatography.<br>Master of Science

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7

Miranda, Vincent F. "Computerized simulations for introductory geography instruction : mental mapping /." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02162010-020048/.

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8

Ursekar, Mahesh T. "Rasterizing the CIA World Data Bank II." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02162010-020128/.

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9

Zurich, Mark A. "A life-cycle analysis of a multi-media teleconferencing network." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02162010-020144/.

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10

Hartman, Chris G. "Concept design of a low cost alternative to DDG 51." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01262010-020117/.

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11

Norton, Shawn Michael. "The evaluation of pump-and-treat groundwater remediation techniques for gasoline with emphasis on in situ bioremediation." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02162010-020100/.

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12

Hogge, Jerome W. III. "Two-dimensional stock cutting processes: an algorithm to optimize two-dimensional stock cutting at New River Valley Workshop, Inc." Master's thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/40885.

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<p>This research addresses a two-dimensional stock cutting problem encountered at the New River Valley Workshop (NRV), Inc. in Radford, VA. This research considers recent literature on two-dimensional stock cutting techniques, pattern generating methods, solution approaches, and practical problem considerations in addressing the NRV cutting problem. Linear Programming analysis is applied to NRV's two-dimensional cutting problem. A computer-based implementation of the LP solution methodology is developed and used to solve NRV cutting problems. Test data and sample problems are used to demonstrate the efficiency, speed and accuracy of the computer-based system. Solution results from test data are compared to current NRV performance, illustrating the significant improvements in solution time and stock utilization that can be attained through the use of LP techniques and this computer-based implementation.<br>Master of Science

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13

Tavenner, Cloyd Tallman. "FAIRSHARE:an investigation into driving a pay for performance system with the multi-criteria measurement technique." Master's thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/40609.

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14

Kulasiri, G. Don. "Simulation of deep-bed drying of Virginia peanuts to minimize energy use." Diss., Virginia Tech, 1990. http://hdl.handle.net/10919/39762.

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A deep-bed drying model simulating the drying of peanuts in a fixed bed is required for designing energy-efficient and automatically controlled dryers. A deep-bed drying model consists of a thin-layer drying model to calculate the moisture release from the material and a set of mass and energy balances. An experimental setup was constructed to determine drying rates of Virginia-type peanuts under 14 different drying air conditions. Selected empirical and semi-theoretical models available for modeling thin-layer drying rates were fitted to the collected data using nonlinear regression techniques. The modified Page's model and the two-term exponential model fitted the data better than other models considered. A deep-bed drying model PEATECH based on four coupled partial differential equations consisting of four variables, air temperature, peanut temperature, air humidity, and peanut moisture content was developed. Validation of the model was accomplished by using the data collected from 36 deep-bed drying experiments conducted using three laboratory dryers during 1987, 1988, and 1989. PEATECH predicted the variables within a peanut bed with an accuracy of less than ± 6%. The energy saving potential of exhaust-air recirculation was established by conducting simulated experiments using a modified version of PEATECH.<br>Ph. D.

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15

Ferro, John Francis. "The design and development of a multilayer RF circuit card." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02162010-020032/.

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16

Stroud, John M. "Plan for improving the quality of a naval combat system test and integration process." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01122010-020109/.

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17

Turner, Paul C. "A systems engineering approach to power systems in remote regions." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-05192010-020012/.

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18

Khanna, Yogesh. "Requirements analysis of federal governments international telecommunications services." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02022010-020111/.

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19

Pascual, Vincent D. "The conceptual design and evaluation of an accuracy control system to support the hull construction of aircraft carriers." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01122010-020056/.

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20

Burkard, Anita M. "Analysis of decision maker preferences." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01262010-020101/.

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21

Evers, Janet M. "Recreational sports programs for special populations at Virginia Polytechnic Institute and State University." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01122010-020044/.

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22

Finley, Allan Michael. "Application of system dynamics modeling techniques to an existing stream water quality model." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02162010-020040/.

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23

Siochi, Lucia Inez. "The interactive computer graphics book : an interactive exploration environment for facilitating the development of visualization skills /." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01262010-020146/.

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24

McKearney, James F. "Analysis of nonlinearities in a voltage-controlled oscillator." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01122010-020048/.

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25

O'Neil, Meganne Ross. "Teaching modules for small business financial management." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02162010-020108/.

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26

Shapiro, Stephen Mark. "Development, evaluation, and implementation of safety measures to prevent marine accidents." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01122010-020105/.

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27

Brown, Neil J. "A multiattribute evaluation model for environmental compliance of existing metal hydroxide precipitation systems in the electroplating industry." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01202010-020209/.

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28

Miles, Eduardo. "Taxonomy of selected design tools for cost-effective design." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02162010-020044/.

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29

Mussie, Mehari Stefanos. "The design of neural networks for the performance estimation of satellite transponders." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02162010-020056/.

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30

Hubbard, Jeffrey Miller. "Developing a model to assist in designing ground vehicular electronic equipment for minimum life cycle cost." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01202010-020237/.

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31

Mowery, Jeffrey Philip. "A performance management feasibility study for a defense based electronics manufacturing organization." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01122010-020052/.

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32

Finkel, Howard S. "No-migration variances - 40 CFR section 268.6general procedures and requirements for submitting a petition to continue the land disposal of restricted wastes." Master's thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/40882.

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<p>A review of the petitioning process and informational requirements was compiled to assist owners/operators of Resource Conservation and Recovery Act (RCRA) facilities in obtaining a variance from the Land Disposal Restrictions Program.</p> <p> A discussion of the RCRA legislative intent of the Land Disposal Restrictions Program as it applies to no-migration variances and the types of facilities the Environmental Protection Agency (EPA) considered likely candidates are provided.</p> <p> A checklist of the required information for a technically complete petition also is included.</p><br>Master of Science

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33

Scamack, Anita Marie. "Apple powdery mildew : literature and research overview /." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02162010-020116/.

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34

Bonnett, Timothy Charles. "A systems view of the nuclear waste dilemma." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01202010-020205/.

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35

Soderstrom, Grant William. "A model for the evaluation and improvement of a coastal defense system." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01202010-020309/.

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36

Taiyabi, Asif A. "A multi-attribute analysis of nuclear waste disposal alternatives." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02022010-020127/.

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37

Prins, William Santiago. "Computer simulation with sensitivity analysis of an advanced composite material manufacturing operation." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02022010-020123/.

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38

Applegate, Steven M. "The design of column base anchorages for shear and tension." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01202010-020157/.

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39

Tiedemann, Maik. "Thermal analysis and thermal control system requirements for a solar sail Mars mission." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02162010-020124/.

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40

O'Connor, Jeffrey R. "Development of a manual for the sanctioning of amateur sport events." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02162010-020104/.

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41

Witt, Joseph P. "Procedure manual for collegiate athletic travel." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02162010-020140/.

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42

Williams, Barbara Helen. "The fit family program." This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02162010-020136/.

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43

Kuhn, Jay C. "Experimental design for the study of extraction efficiencies of the continuous liquid-liquid extractor." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01202010-020253/.

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44

Adam, Johan D. "Failure diagnostic expert systems : a case study in fault diagnosis /." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01202010-020148/.

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45

Tan, Gim Peng. "Modeling a CIM system with Micro SAINT." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01122010-020118/.

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46

Fillmore, Gary Boyd. "The use of wetlands as a wastewater treatment technique : a literature review /." This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01262010-020113/.

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47

Leivonen, Douglas Eric. "Utilization of performance and cost criteria in evaluating energy saving alternatives." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-03302010-020217/.

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48

Amanuma, Kazushi. "Dielectric properties of PFN-PFT solid solution synthesized by the molten salt method." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01202010-020152/.

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49

Kumar, Nadella Navin. "Evaluation of ISDS software." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01262010-020122/.

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50

Madutujuh, Nathan. "Geometrically nonlinear analysis of plane trusses and plane frames." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01262010-020134/.

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