Browsing ETDs: Virginia Tech Electronic Theses and Dissertations by Title
Now showing items 70-89 of 38450
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A biosystematic revision of the Nearctic species of the mayfly genus Isonychia (Ephemeroptera: oligoneuriidae)
(Virginia Polytechnic Institute and State University, 1982)The Nearctic species of the genus Isonychia Eaton are revised. Eighteen species are recognized, of which three are described as new; eleven species names are placed in synonymy. Isonychia campestris McDunough is recognized ... -
A case study of North Carolina desegregation issues: influence patterns of federal and state courts and state statutes
(Virginia Polytechnic Institute and State University, 1976)Problem: This study sought to analyze the influence patterns among federal court decisions, state appellate court decisions, and state statutes pertaining to the desegregation of public schools in North Carolina. Sources ... -
A comparative analysis of movers and non-movers to a retirement community
(Virginia Polytechnic Institute and State University, 1987)The purpose of this study was to determine whether significant differences exist between movers and non-movers to a retirement community in the areas of demographic characteristics, residential characteristics of the most ... -
A comparative analysis of the heart rate-oxygen consumption relationship observed during Bruce protocol graded exercise stress tests and steady-state exercise
(Virginia Polytechnic Institute and State University, 1986)Twenty-eight endurance trained male volunteers, 18-41 years or age, were studied to determine whether the heart rate-oxygen consumption relationships observed during Bruce protocol stress tests were similar to those observed ... -
A comparative analysis of the reproductive efficiency of 14 Virginia market type peanut cultivars (Arachis hypogaea L.)
(Virginia Polytechnic Institute and State University, 1986)There is inadequate basic information available on the reproductive efficiency of peanut (Arachis hypogaea L.) cultivars and a need to determine the sources of yield improvement made in peanut over the past four decades. ... -
A comparison of computer simulation techniques in depicting and communicating the visual impacts of timber harvesting in the Jefferson National Forest
(Virginia Polytechnic Institute and State University, 1994)Advances in computer technology have made it possible for designers to manipulate realistic images on a computer screen. Previously, most computer generated images consisted of line drawings or distorted grid perspectives. ... -
A comparison of thermodynamic models for the prediction of phase behavior in aqueous-polymer two-phase systems
(Virginia Polytechnic Institute and State University, 1986)Aqueous-polymer two-phase systems consist of various combinations of water, polymer(s), low molecular weight component(s), and salts. These aqueous-polymer systems are comprised of two phases, each of which contains about ... -
A critical assessment of crack growth criteria in unidirectional composites
(Virginia Polytechnic Institute and State University, 1985)The problem examined is an infinite anisotropic layer with a through crack at arbitrary orientation, subjected to uniform in-plane remote loading. The purpose of this study is to gain a better understanding of several ... -
A documentation and analysis of the physical, operating, and business environments for small-tree handling and harvesting
(Virginia Polytechnic Institute and State University, 1987)Study objectives were 1) to identify successful mechanized thinning and prelogging systems currently operating in the South, 2) to document system characteristics contributing to their success, and 3) to determine which ... -
A finite characterization of K-matrices in dimensions less than four
(Virginia Polytechnic Institute and State University, 1983)The class of real nxn matrices M, known as K-matrices, for t which the linear complementarity problem w-Mz=q, w≥O, z≥O, wtz=O has a solution whenever w-Mz=q, w≥O, z≥O has a solution is characterized for dimensions ... -
A finite element analysis of adhesively bonded composite joints including geometric nonlinearity, nonlinear viscoelasticity, moisture diffusion and delayed failure
(Virginia Polytechnic Institute and State University, 1987)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 ... -
A finite element, Navier-Stokes study of the confined, laminar flow over a downstream facing step
(Virginia Polytechnic Institute and State University, 1984)The two-dimensional, confined, laminar flow over a downstream facing step was studied using a finite element, Navier-Stokes equation solver. The weak form of the stationary, incompressible Navier-Stokes equations in primitive ... -
A finite population queueing system with a supporting inventory of spare parts-analysis and design
(Virginia Polytechnic Institute and State University, 1986)In this thesis, a model is developed for a finite population queueing system deployed to meet a constant demand for the situation where failed units require a single spare part to initiate repair action. A supporting ... -
A functional analytic approach to multigroup transport theory
(Virginia Polytechnic Institute and State University, 1975)A functional Analytic method which was first introduced by Larsen and Habetler for the one-speed isotropic case in 1973 is applied to full and half-space multigroup problems in one dimension with a constant and invertible ... -
A heuristic method for the optimal design of water distribution systems
(Virginia Polytechnic Institute and State University, 1987)The water distribution system design problem consists of finding a minimum cost combination of network layout and sizes of system components so as to satisfy flow demands, minimum and maximum head requirements and a ... -
A mathematical model for the detection of deep space objects
(Virginia Polytechnic Institute and State University, 1987)The problem of detecting deep space objects with certain probabilities was investigated. A mathematical model was then developed from given problem specifications that deals with the trade-off of various parameters involved ... -
A mathematical model of iodine spiking in pressurized water reactors
(Virginia Polytechnic Institute and State University, 1984)When a pressurized water reactor is operated for a sufficiently long period of time, a small number of fuel rods will develop ruptures in their claddings. These defects will leak volatile fission products into the primary ... -
A method of data collection for the evaluation of forest harvesting systems
(Virginia Polytechnic Institute and State University, 1984)A unified international method to capture, record, and report the information necessary for documenting the mechanical performance of harvesting machines and systems under specified conditions is presented. It provides a ... -
A methodology for session monitoring on broadband bus/tree local area networks
(Virginia Polytechnic Institute and State University, 1986)Network management and control of large broadband local area networks, where the number of nodes ranges from several hundred to a few thousand, is a very important concern for today's network manager. This primarily involves ... -
A preliminary investigation of microbubble flotation of fine coal
(Virginia Polytechnic Institute and State University, 1986)Although froth flotation is generally recognized as the most viable means of cleaning fine coal, a loss in recovery rate and selectivity is encountered when attempting to apply the process to clean ultrafine coals. In this ...
