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Dissertations / Theses on the topic 'LD5655.V855 1987.R696'

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Published: 4 June 2021
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1

Royo, Sheila G. "Sponsorship and migration in Northeast Thailand." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/64567.

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Sponsorship is widely recognized as a major factor in migration decisions. However, the extent to which it encourages potential migrants to move has been little documented. This study documents the role of urban sponsorship in rural to urban migration decisions, specifically sponsorship in Northeast Thailand, using data originally gathered to redirect rural to urban movement in the area, and utilizing multiple analysis of variance and multiple regression to account for the effect of sponsorship on potential migration decisions among other competing explanations. The characteristics of urban
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2

Rogers, Steven B. "An investigation into the occurrence of accelerator/brake pedal actuation errors during simulated driving." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/44680.

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Although many studies have investigated accelerator/brake pedal placement in terms of the time needed to move the foot from the accelerator to the brake during emergency braking (i.e. movement time), none have as yet specifically addressed the issue of pedal actuation errors. The primary purpose of the present study was to determine what types of errors (if any) occur, to document the frequency with which various categories of error occur, and to determine whether the different types of error are configuration-dependent. To accomplish this, the foot movements of subjects were observed and r
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3

Rousseau, Carl Q. "Stresses and deformations in angle-ply composite tubes." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/51901.

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The objective of this study was to investigate, both experimentally and analytically, the stresses and deformations in angle-ply composite tubes subjected to axisymmetric thermal loading. For the theoretical portion, a generalized plane strain elasticity analysis was developed. The analysis included mechanical and thermal loading and temperature-dependent material properties. Using the elasticity analysis and a temperature range of 116 K to 450 K, stress levels were found to be high for the specific designs considered, compared to material failure levels. In addition, the use of temperature-de
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4

Rodarte, Alma Isabel Marín. "Predispersed solvent extraction." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/45173.

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<p>A new solvent extraction method has been developed for the extraction of metal and organic ions from very dilute aqueous solutions. The new method, which has been named Predispersed Solvent Extraction (POSE), is based on the principle that 1 there is no need to comminute both phases. All that is necessary is to comminute the solvent phase prior to contacting it with the feed. This is done by converting the solvent into aphrons, which are micron-sized globules encapsulated in a soapy film. Since the aphrons are so small, it takes a long time for the solvent to rise to the surface unde
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5

Roop, Roy Martin. "A taxonomic study of the genus Campylobacter." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/71253.

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One hundred and eighteen (118) Campylobacter strains were studied by DNA homology experiments and characterized phenotypically. These strains formed eleven (11) distinct DNA homology groups (species) corresponding to C. fetus, C. "hyointestinalis", C. jejuni, C. coli, C. laridis, C. nitrofigilis, C. sputorum, C. mucosalis, C. concisus, and two unnamed groups currently referred to as the aerotolerant campylobacters and the "catalase-negative or weak" (CNW) strains. For practical reasons, we propose retaining the subspecies fetus and venerealis designations for C. fetus. In addition, we propose
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6

Roloff, Thomas Paul. "Design and development of an odorless toilet." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/45175.

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The design and development of a novel system for removing odorous gases from toilets is presented. A review of the numerous existing patents for mechanical systems designed to deodorize commodes, none of which is fully satisfactory, shows that they all employ suction using one of two basic configurations: single point suction or perimetral suction, to remove the obnoxious fumes. The present design uses the single suction approach with two new features added: the use of an activated charcoal filter to deodorize the gases removed from the toilet, and the recirculation of part of the deodoriz
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7

Robinson, Joseph K. "The role of bound water content in defining sludge dewatering characteristics." Thesis, Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/50083.

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Several available methods of measuring sludge bound water content in the laboratory were examined. The effect of polymer conditioning on the bound water content of biological sludge samples was measured using the dilatometric method. The effects of mechanical dewatering on the bound water content of biological sludge samples and on chemical sludge samples was measured using the same method. The controlled drying method was used to measure the effect of polymer conditioning and mechanical dewatering on the chemically bound water fraction. The relationship between bound water content and cake
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8

Roongsita, Somsak. "Simulation and study of harmonic interference in power line communications." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/101256.

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Power line carrier (PLC) is one of the communication and load control (C&LC) techniques employed in direct load control. A PLC is, within itself, a communication system. It utilizes power transmission line as a medium of transmitting control functions, and relaying. High frequencies, in the order of 30 to 300 kHz, are used. Power line carrier systems are, at present, the most attractive C&LC systems. Recently, dispersed generation - photovoltaics, wind energy, small scale hydro - is introduced to power systems. The introduction of small scale dispersed generation sources degrades the perform
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9

Roy, Samit. "A finite element analysis of adhesively bonded composite joints including geometric nonlinearity, nonlinear viscoelasticity, moisture diffusion and delayed failure." Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/88624.

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A two-dimensional finite-element computational procedure is developed for the accurate analysis of the strains and stresses in adhesively bonded joints. The large displacements and rotations experienced by the adherends and the adhesive are taken into account by invoking the updated Lagrangian description of motion. The adhesive layer is modeled using Schapery's nonlinear single integral constitutive law for uniaxial and multiaxial states of stress. Effect of temperature and stress level on the viscoelastic response is taken into account by a nonlinear shift factor definition. Penetrant sorpti
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10

Royeen, Charlotte Brasic. "An exploration of parametric versus nonparametric statistics in occupational therapy clinical research." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/71181.

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Data sets from research in clinical practice professions often do not meet assumptions necessary for appropriate use of parametric statistics (Lezak and Gray, 1984). When assumptions underlying the use of the parametric tests are violated or cannot be documented, the power of the parametric test may be invalidated and consequently, the significance levels inaccurate (Gibbons, 1976). Much research has investigated the relative merits of parametric versus nonparametric procedures using simulation studies, but little has been done using actual data sets from a particular discipline. This study co
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11

Roy, Leena. "An empirical study of the double bind." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/74718.

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The purpose of this experiment was to empirically study and document the double bind. Twenty outpatient clinical and twenty matched non-clinical adolescents between the ages of 13 and 19 were studied. Three research questions were investigated. The first was the nature of the bodily responses in terms of cognitive complexity and emotional stress to inconsistent and consistent messages in the context of a close relationship. Cognitive complexity was measured by Reaction-time, and emotional stress by heart-rate and frequency of non-verbal movement (arm, leg and foot). The consistent and incons
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12

Buxton, Nancy L. "An American institution: the Smithsonian, 1846-1878." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101169.

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In 1846, Congress created the Smithsonian Institution. Congressmen expected the Institution to advance the cause of American science as did Joseph Henry, the organization's first secretary. The Institution fulfilled that role in a manner consistent with its congressional mandate. Henry, however, believed that total compliance with Congress decreased the Institution's ability to shape American science. Congress, Henry thought, had split the Institution into too many departments, diluting its ability to encourage pure scientific research. This thesis traces the Smithsonian's development by exam
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13

Keys, Joel Edwin. "Design, fabrication and application of a dedicated thick-film hybrid time domain reflectometer." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45778.

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<p>This work presents a design process for developing a dedicated hybrid thick-film time domain reflectometer. The design process allows for variation of the pulse generator characteristics as well as the output impedance of the unit. The unit is fabricated using standard thick-film hybrid techniques while giving consideration to problems encountered at microwave frequencies. This thesis also presents an overview of time domain reflectometry and its applications. Special emphasis is given to the problem of characterizing material dielectric constants using delay measurements.</p><br>Master of
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14

Song, Qian. "Composition dependence of superconductivity in YBa₂(Cu1-xAx)₃O6+δ system with A = Zn, Ni". Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/42032.

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The results of substitution of A (with A = Ni and Zn) for Cu are presented in the high Tc superconductors, YBa₂(Cu<sub>1 - x</sub>A<sub>x</sub>)₃O<sub>6 + δ</sub> where x < 0.03 for Zn and x< 0.10 for Ni. We have observed that the superconducting temperature in the high Tc YBa₂Cu₃O<sub>6 + δ</sub> as system decreases if copper is substituted by Ni and Zn and the substitution of Zn affects Tc much more than Ni. We discuss our results in terms of pair breaking by magnetic impurities and in terms of the Resonance Valence Bond model proposed by Anderson.<br>Master of Science
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15

Hoe, Ruan. "An assessment of the determinants of interprovincial migration in China, 1982-1987." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/42002.

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This study attempted to assess the major determinants of interprovincial migration in the People's Republic of China. The findings suggest that the classical gravity and pull-push hypotheses can also find supporting evidence in the People's Republic of China. Basically, the differential socio-economic characteristics and circumstances determined interprovincial population movement, but relatively speaking, the destination factors played more important roles. Among the variables examined in the study, destination investment and agricultural income level had the strongest pull-force on migrants.
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16

Abdalla, Hassan Z. "Performance Analysis of Multicomputer Interconnection Network Designs." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101364.

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In this thesis, the design and performance issues of multicomputer interconnection networks are addressed. Analytic models are used to evaluate the performance of large scale multicomputer networks. Performance is measured as the average end-to-end delay between communicating nodes. The models consider the communication processing queueing delays experienced by packets at each node as well as delays associated with transmission of packets. A comparison study of message switching and cut-through switching is presented. It is shown, conforming to previous studies, that a network has superior per
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17

Allen, Diane. "Surface analysis of sodium oleate coated poly (ethylene terephthalate) films." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101366.

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Polymer films are often pre-treated to alter surface properties resulting in improved adhesion and wettability. The objective of the present work was to demonstrate the applicability of surface-sensitive techniques in the analysis of polymer films coated with thin overlayers. The surface or interphase region of sodium oleate coated polyethylene terephthalate (PET) films was studied by angle dependent x-ray photoelectron spectroscopy (XPS) and secondary ion mass spectrometry (SIMS). The effect of corona discharge pre-treatment on sodium oleate coating adhesion was of particular interest. The
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18

Meinert, Todd Richard. "Effects of within herd variation on the relationship between genetic evaluations and performance of offspring." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/41548.

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<p>1,032,438 Jersey and 1,162,578 Holstein official Dairy Herd Improvement Association (DHIA) records from 20,380 and 34,000 herd-years, respectively, were used to compute herd-year means and within herd-year standard deviations for individual mature equivalent (ME) milk, fat, and fat percent. These herd-year means and within standard deviations were used to stratify records into five classes. Regressions for individual daughterâ s modified contemporary deviation (MCD) on sireâ s predicted difference (PD) were calculated for each class. The within herd-year standard deviations were als
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19

Ohene, Frederick A. "Adequacy of minimum passing sight distances for completing or aborting the passing maneuver." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/44058.

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Overtaking and passing maneuvers on two-lane rural roads is still one of the most complex situations drivers are faced with in everyday driving. In passing, drivers must judge the speed, acceleration and deceleration capabilities of their own vehicle, that of the impeding vehicle and the speed and rate of closure of the oncoming vehicle. They also have to make decisions on the adequacy of an acceptable gap and sight distance. This report presents an investigation of the adequacy of the current "Manual on Uniform Traffic Control Devices" (MUTCD) for marking on two-lane, two-way roads. It
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20

Masad, Jamal A. "On subharmonic instability in boundary layers." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45783.

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<p>The subharmonic instability in two-dimensional boundary layer on a flat plate is analyzed using the parametric instability model and the resonant triad model. The problems arising from both models are solved numerically using the shooting technique and results are presented. It is found that in the presence of a strong interaction (e.g., large amplitude of the two-dimensional wave), results from the resonant triad model are inaccurate as compared with the experimental data and the t results from the parametric instability model. This is mainly because the resonant triad model is a w
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21

Goy, David A. "Soliton Propagation in nonlinear optical fibers: theory and application." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/44675.

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<p>A survey of research in nonlinear optical fibers is given. Important background concepts are introduced and explained. Present and future applications of nonlinear optical fibers arc reviewed. A mathematical model of a nonlinear optical fiber is developed using a coupled-mode theory approach, and methods of solving nonlinear partial differential equations arc discussed. A detailed history of research in the field is given, and recommendations for future research are made.</p><br>Master of Science
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22

Li, Chungwuu. "A general robot path verification simulation system: GRPVSS." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45813.

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Collision-detection is a critical task for off-line robot path planning. A general robot path verification simulation system, GRPVSS, applicable for all industrial robots with open-looped links, is created to verify the intended robot path. The manipulator and obstacles are modeled by convex polyhedra to reduce the computation burden required by the collision detection algorithm. As a kinematic simulator, GRPVSS employs motion-time profiles or ideal trapezoid profiles which describe the position-vs-time relation of an individual joint, to generate the robot working trajectory. This approach ma
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23

DeWalt, Diane Vivian. "Nonlinear equilibrium and perturbation solutions for a hose-drogue aerial refueling system." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/94503.

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Several mathematical models are developed for a hose-drogue refueling system in an attempt to represent the physical system accurately and to subsequently observe the dynamic response of the system under different initial conditions. The mathematical models examined include a flexible hose model and a model which includes elastic bending effects. The equations of motion include aerodynamic, gravitational, and tensile forces, and solutions of the refueling system are found using fewer assumptions than in previous work. Once the equations of motion are developed, they are separated into equili
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24

Arnold, Michael Alan. "The International Coffee Agreement: an analysis of a successful cartelization effort." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/91076.

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The first International Coffee Agreement (ICA) came into force on September 1, 1963 and established a system for regulating coffee exports and imports primarily by employing quotas to limit coffee supply. The ICA has been in existence since that time and is now in its fourth edition. The continued operation of the Agreement for nearly twenty five years is an apparent contradiction of economic cartel theory. Two major areas related to the success of the ICA cartelization effort are the focus of this paper. First, the structure of the Agreement, especially the provisions for regulating exports
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25

Chadha, Ritu. "Decomposing rectilinear regions into rectangles." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/90962.

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This thesis discusses the problem of decomposing rectilinear regions, with or without holes, into a minimum number of rectangles. There are two different types of decomposition considered here : decomposing a figure into non-overlapping parts, called partitioning, and decomposing a figure into possibly overlapping parts, called covering. A method is outlined and proved for solving the above two problems, and algorithms for the solutions of these problems are presented. The partitioning problem can be solved in time O(n⁵ ²), where n is the number of vertices of the figure, whereas the covering
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26

Bartelmehs, Kurt Lane. "Bond length and bonded radii variations in sulfide molecules and crystals containing main group elements." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/91160.

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Molecular orbital calculations on 18 hydrosulfide molecules containing selected main group X-cations yield minimum energy bond lengths, R<sub>t</sub>(XS), that reproduce those observed in chemically similar sulfide crystals. A least-squares analysis shows that R<sub>t</sub>(XS) can be estimated by the equation R = l.83(s/r)<sup>-0.21</sup>, where s is the Pauling bond strength and r is the row number of the X-cation in the periodic table, with 98% of the variation of R<sub>t</sub>(XS) being explained in terms of a linear dependence on R. In addition, R serves to rank observed XS bond lengths i
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27

Murano, Elsa Alina. "Role of polymorphonuclear leukocytes in the tumoricidal activity of Propionibacterium acnes." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/50069.

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The mechanism responsible for the killing of tumor cells after injection of mice with a mixture of tumor cells and Propionibacterium acnes were investigated. Tumor cells were injected intramuscularly into Balb/c mice either alone or together with P. acnes vaccine. The tumor cells were then removed from the injection site 12 hours after injection, and transferred into fresh mice. Tumor cells from control animals given tumor cells only caused tumors when transferred into fresh mice 12 hours after injection whereas tumor cells from animals given both tumor cells and vaccine did not develop tumors
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28

Dong, Bonian. "Numerical simulation of two-dimensional lifting flow." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101182.

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The panel method is reviewed, in which linear polynomials are used to approximate the vorticity distribution on the surface of a body. Two new panel methods are developed, in which quadratic and cubic polynomials are used in an attempt to make the derivative of the velocity continuous along the surface of the body. But the results are not better than those obtained by choosing the linear polynomials as the interpolations. After the three interpolation schemes are critically evaluated, numerical examples, based on the linear scheme, are presented to illustrate some applications of the method. T
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29

Dougherty, Brian P. "An automated probe for thermal conductivity measurements." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101183.

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A transient technique was validated for making thermal conductivity measurements. The technique incorporated a small, effectively spherical, heat source and temperature sensing probe. The actual thermal conductivity measurements lasted 30 seconds. After approximately 15 minutes of data reduction, a value for thermal conductivity was obtained. The probe yielded local thermal conductivity measurements. Spherical sample volumes less than 8 cm² were required for the materials tested. Thermal conductivity (and moisture) distributions can be measured for relatively dry or wetted samples. The techn
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30

Sourirajan, Aravind. "Computer aided design of a switched reluctance motor." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/53720.

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In recent years, the product life cycle has decreased and demands for new products have emerged due to competition, modern industrial needs and rapidly changing technology. This has necessitated changes in design, development and manufacturing processes to improve the quality and efficiency and to reduce the cost. Computer Aided Design (CAD) helps to meet this challenge both in the design evaluation and product design stages. This thesis contains the development of an interactive software for the optimal design of a motor intended for variable speed applications. The use of finite element ana
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31

Swanson, Gary D. "Structural efficiency study of composite wing rib structures." Thesis, This resource online, 1987. http://scholar.lib.vt.edu/theses/available/etd-04292010-020010/.

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32

Lin, Po-Ming. "Using wave attenuation techniques for monitoring of stress levels." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45814.

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Stress can have a significant effect on the stability of pillars. To get an accurate picture of pillar stability, information is needed not only on the initial stress magnitude and distribution but also on all subsequent stress changes. Sonic methods have the potential to be among the fastest, most economical and least destructive means of stress measurement. Wave propagation velocity has long been applied to the investigation of the upper mantle and crust stress. Recently, it has also been applied to rock burst prediction and mine site investigations. Another parameter for investigating st
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33

Reed, Karen L. "The influence of meteorological events and cultural practices on sclerotinia crown and stem rot of alfalfa, caused by Sclerotinia trifoliorum." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/43891.

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Sclerotinia crown and stem rot (SCSR), caused by Sclerotinia trifoliorum Eriks., causes serious spring losses in some fall=sown, no-tillage alfalfa fields. In microplots artificially infested with sclerotia, greatest numbers of apothecia were found during November and December. Temperature and rainfall had significant impact on apothecium development. A proposed prediction method for apothecium appearance considers monitoring mean soil temperature. For apothecium initiation to occur, it was necessary for sclerotia to be subjected to an estimated 17 days of temperature at or below 15 C
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34

Kerkhoff, Karen Leigh. "Effects of defoliation on the cultivated strawberry (Fragaria X ananassa Duch.)." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45799.

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<p>Using 'Redchief' (Junebearer) and 'Tribute' (dayneutral) cultivars, greenhouse and field studies were conducted to determine the effects of defoliation on photosynthesis, growth and yield of the strawberry. From preliminary photosynthesis experiments it was found that both 'Redchief' and 'Tribute' strawberry leaves reached maximum net photosynthesis (Pn) concurrently with full leaf expansion at approximately 8 to l0 days and 4 to 5 days, respectively, after unfolding. By exposing the plants to increasing irradiance it was determined that these cultivars were light saturated at 600
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35

Lhotellier, Frederic C. "Matrix-fiber stress transfer in composite materials elasto-plastic model with an interphase layer." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/40934.

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<p>The matrix-fiber stress transfer in glass/epoxy composite materials was studied using analytical and experimental methods. The mathematical model that was developed calculates the stress fields in the fiber, interphase, and neighboring matrix near a fiber break. This scheme takes into account the elastic-plastic behavior of both the matrix and the interphase, and it includes the treatment of stress concentration near the discontinuities of the fibers. The radius of the fibers and the mechanical properties of the matrix were varied in order to validate the mathematical model. The compu
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36

Moyers, Kevin Keith. "A microcomputer-based data acquisition system for diagnostic monitoring and control of high-speed electric motors." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/41576.

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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.</p> <p> Bearing vibration and outer race temperature were continuously monitored for each ball bearing in the motor. In addition, the stator winding and motor casing temperature were monitored.</p> <p> The monitoring system was successful in detecting an unbalance in the rotor caused by the loss of a small piece of balancing putty. The motor was shut
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37

Raville, James Richard. "Quality and browning and the effects of ph adjustment on cakes prepared with high fructose corn syrup." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/44065.

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Cakes were prepared with high fructose corn syrup as the total sweetening agent in a moisture adjusted formulation which allowed for the moisture content of the syrup. Three treatments were produced by adding glucose-delta-lactone and cream of tartar (high acid), cream of tartar (medium acid), or no addition (low acid). Cakes were baked and.immediately tested under controlled conditions. The pH and specific gravity were determined for cake batters. Baked cakes were evaluated for pH, standing height as an index to volume, moisture, deformation, crust color, and crust and crumb browning. Volum
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38

Scroggs, Jane A. "The internal labor market of professional football." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/44069.

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Scholars in many fields have long studied the patterns of employment and promotions in industries and occupations. However, the area of sport has been largely omitted from studies of this type. This study explored the possibility of an internal labor market for head coaches of the National Football League (NFL). Subjects were those people who were the head coaches of NFL teams for the years 1970 to 1975 and 1980 to 1985. Following theoretical guidelines, the subjects were tested for evidence of industrial, occupational, and/or pure internal labor markets. Statistical treatment of the data uti
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39

Shagena, Elizabeth C. "Comparison of packed and wide-bore, open-tubular gas chromatographic columns." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45896.

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<p>Wide-bore, fused-silica capillary columns can be an excellent replacement for packed columns in many cases. They can provide higher surface inertness and thermal stability, as well as higher efficiency or speed of analysis. Wide-bore, open-tubular (WBOT) columns with thick films have higher sample capacities than conventional narrow-bore capillary columns and can be used in unmodified packed-column gas chromatographs.</p><p> The majority of gas chromatographic analyses are still performed using packed columns. Many chromatographers associate open-tubular columns exclusively with sp
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40

Overboe, Paul David. "Optimizing log truck payload through improved weight control." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/43887.

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Trucking of forest products is a very important segment of the harvesting process and it is monitored relatively closely by external sources. Load weight is the focal point of the attention received by log hauling. The optimization of load weights is therefore very important to a logging operation's success and this can be achieved only through adequate gross vehicle weight control. Methods of load weight control are reviewed and possible applications discussed in this report. Studies were conducted to evaluate the adequacy of load weight control achieved utilizing two quite different methods.
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41

Sappington, Keith Gordon. "Toxicological, physiological, and behavioral responses of the Asiatic clam, Corbicula sp., to biocidal and copper perturbations." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/44067.

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Experiments were conducted on the effectiveness of exposure to simultaneous temperature shock with chlorination, monochloramine, and ammonia as control agents of the Asiatic clam, Corbicula sp. Control procedures were evaluated based on lethal and sublethal responses (e.g., glycogen, tissue water, dry weight index, and siphoning activity) of clams during 30-day laboratory artificial stream studies. Studies also were conducted comparing sublethal responses (e.g., glycogen, tissue water, soluble protein, and siphoning activity) of clams to copper, a component of power plant effluents, during 30-
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42

Jensen, Anne J. "A life cycle value assessment model for design, production, and logistic support systems." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45785.

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A new economic model for the evaluation of integrated Design, Production, and Logistic Support Systems (DPLSSs) is designed and developed in this thesis. The DPLSS model was created after a survey of Life Cycle Costing (LCC) applications revealed that no models for assessing integrated design, production, and logistic support systems were available. The evaluation technique the model is based on is called Life Cycle Value Assessment (LCVA). LCVA differs from LCC in that it emphasizes consideration of life cycle revenues as well as costs.</p> <p> The system addressed by the DPLSS model h
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43

Ranganathan, Kannan. "A simulation model for stress measurements in notched test specimens by x-ray diffraction." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45887.

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<p>An analytical model was developed to simulate the stress state of notched tensile specimens. Actual experiments are being carried out by other investigators to study the relaxation of residual stresses in specimens containing stress raisers. In the present work, the stress state developed in notched tensile specimens was assessed by determining the response of the stress state in the form of x-ray line profiles; this is useful in the understanding and measurement of effects due to such stress states obtained in actual experiments. The theoretical relationship between the stress gradient
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44

Lin, Mark Wen-Yih. "Elastoplastic response of unidirectional graphite/aluminum under combined tension-compression cyclic loading." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45812.

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<p>A test fixture for combined tension-compression cyclic testing of unidirectional composites was designed and characterized using 606l-O aluminum specimens. The elastoplastic response of graphite/aluminum l5° off-axis and 90° specimens under tension-compression cyclic loading was subsequently investigated at three temperatures, -l50°F, room temperature and 250°F. The test results showed that the tensile response was predominantly elastoplastic, whereas the compressive response could not be characterized exclusively on the basis of the classical plasticity theory. Secondary dissipat
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45

Oliveira, Willer de. "Star-like macromers from lignin." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/43255.

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Star-like macromers were prepared from hydroxypropyl lignin by reaction with propylene oxide. The average number of arms per macromer was controlled by partial capping with diethylsulfate, and the average arm length by the degree of chain extension with propylene oxide. Six methods of analysis were applied for characterizing of the star-like macromers: total hydroxyl (by titration), vapor pressure osmometry, hydriotic acid/gas chromatography, ultraviolet spectroscopy, proton-nuclear magnetic resonance spectroscopy and thermal analysis. Number average molecular weights were measured by vapo
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46

Shands, Nancy. "The lonely voyage: support or isolation for gay men with AIDS?" Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/43893.

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Twenty-five gay men, 20 with Acquired Immune Deficiency Syndrome (AIDS) and 5 with either AIDS Related Complex (ARC) or who tested positive for the AIDS virus, were asked in semi-structured interviews whether they felt supported or isolated. Areas covered included society in general, employment, housing, health care, insurance, religion, families of origin, ex-wives, children, friends and lovers. Subjects indicated that fear of AIDS, homophobia, and death anxiety were all present in certain circumstances, but there was no attempt to differentiate between these three possible causes o
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47

Noon, David P. Jr. "Performance of a wideband CDMA system under multipath fading." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45825.

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<p>The objective of this thesis is to determine the average probability of bit error of an asynchronous, noncoherent, direct-sequence, code-division multiple-access (CDMA) system using wideband M-ary FSK as bandpass modulation. The immediate analysis and determination of the average probability of bit error is made inherently more difficult because of two random effects. The first disturbance encountered in the analysis is the existence of additive, white, Gaussian noise and multi-user noise. The second disturbance, which is more difficult to analyze, is the effect of multipath fading, w
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48

Pehrsson, Kirsten M. "Software development cost estimating models: an application of the hedonic pricing approach." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45910.

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<p>Software development cost estimating models were analyzed using an application of the hedonic pricing approach. Several recently proposed software cost estimating tools were surveyed for the purpose of revealing their roots in the hedonic pricing approach. The analysis includes discussion of the hedonic pricing approach, the logic of several software cost models, and analysis of the models' hedonic pricing traits.</p> <p> Hedonic prices are the implicit prices of attributes of I differentiated products as revealed in the market through attribute levels associated with market-clea
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49

McLintock, Brian Thomas. "Musical expression in automated composition of melodies." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45809.

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<p>Music composed by computers has always been lacking in "musical" qualities: mood, emotional expression and a sense of purposefulness or goal. A musical expert system, called EMOTER, is the first attempt to address these important musical aspects. EMOTER receives as input a list of moods (e.g., happy, lively) and generates melodic passages intended to evoke those moods in an organized, coherent fashion. EMOTER composes the basic units of music called phrases.</p> <p> The program uses the mood-specification from a theory due to Deryck Cooke to derive a few motifs (very primitive me
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50

Essid, Samir. "Interactive microcomputer model for solar radiation evaluation and photovoltaic output comparison." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/90967.

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The basic resource of all solar systems is the sun, and a knowledge of the quantity of the energy available is of prime importance. Although the solar radiation outside the atmosphere is known and almost constant, various climatic factors cause wide variations in its value on the earth's surface. In addition, the relative position of the sun with respect to local points of interest will allow surfaces with different orientations and tracking ability to receive different quantities of solar energy. This research focuses on the effect of cloud cover on the solar radiation received on the earth's
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