WorldCat Identities

VIRGINIA POLYTECHNIC INST BLACKSBURG

Overview
Works: 73 works in 81 publications in 1 language and 82 library holdings
Classifications: LD5655.V856,
Publication Timeline
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Most widely held works by VIRGINIA POLYTECHNIC INST BLACKSBURG
The relationship of nitrogen content of austenitic stainless steels to stress corrosion by Gary Sturgill Clevinger( Book )

4 editions published between 1968 and 1969 in English and held by 4 WorldCat member libraries worldwide

Development of a numerical method to solve the three-dimensional compressible laminar boundary-layer equations with application to elliptical cones at angle of attack by J. J McGowan( Book )

1 edition published in 1970 in English and held by 2 WorldCat member libraries worldwide

A method for solving general compressible three-dimensional boundary-layer flows is developed. The equations are initially placed in a Crocco-type form which makes use of similarity variables. A general solution tehcnique which employs an implicit finite-difference scheme that is stable for negative transverse velocities is developed. As an application of the method, solutions for 10 degree vertical half-angle elliptical cones of varying ellipticity ratios at up to 8 degree angle of attack at a Mach number of 7.95 are presented. Skin friction and heat-transfer-rate distributions are presented for all cases. Good agreement is found with the experimental data of Tracy for heat-transfer rates on circular cones at angle of attack. (Author)
A Competency Pattern Approach to Curriculum Construction in Distributive Teacher Education. Final Report, Volume Iii by Lucy Clark Crawford( Book )

1 edition published in 1967 in English and held by 1 WorldCat member library worldwide

This study involves all distributive education state supervisory and teacher education personnel in the United States, 48 distributive education teacher coordinators, and 400 distributive workers at the entry, supervisory, and management levels. This document, Volume iii, includes the critical tasks, competencies needed to perform the tasks, and a cross tabulation of competencies needed by workers in selected categories of food stores, service stations, and wholesaling. Volume ii (vt 005 974) and Volume iv (vt 005 976) include the same information for the areas of department stores, variety stores, hotels-motels, and restaurants. Volume I (vt 005 973) includes a philosophy of distributive education, the critical tasks of the high school distributive education teacher coordinator, the professional competencies needed to perform the critical tasks, the technical competencies needed to develop identified competencies of selected distributive workers and a cross tabulation of competencies needed by selected distributive workers. Volume v (vt 009 085) includes final reports of Phases ii and iii of the study. (Mm)
Abstracts, 21st Annual Meeting Society of Engineering Science, Inc., October 15, 16 and 17, 1984( Book )

1 edition published in 1984 in English and held by 1 WorldCat member library worldwide

This publication contains all of the abstracts provided by authors participating in the 21st Annual Meeting of the Society of Engineering Science held on October 15-17, 1984 at the Donaldson Brown Conference Center on the campus of Virginia Polytechnic Institute and State University. The following tables of contents and an authors' index at the back of the publication will assist the reader in locating abstracts and authors in specific disciplines. The abstracts included herein should give an idea of the current research in various fields of engineering science
Development of a method for determining the response of a thin hemispherical shell to the initial pressure pulse of an underwater explosion by George R Webb( Book )

1 edition published in 1964 in English and held by 1 WorldCat member library worldwide

A method is derived for determining the dynamic, elastic response of a thin hemispherical shell subjected to a head-on attack by the initial shock wave of an underwater explosion. The shell which is fastened to the end of a fixed, semi-infinite tube of the same radius is surrounded by a high density fluid similar to water, and the internal cavity of the shell is filled with a low density fluid similar to air. The initial shock wave moves through the high density fluid. In the neighborhood of the obstacle, the shock front propagates in the direction of the axis of the semi-infinite tube and at time equal to zero (+) makes initial contact with the obstruction at the tip of the hemisphere. The problem is approached entirely by analytical methods. Approximate expressions which are valid for small time are obtained. Numerical results are calculated for a steel shell immersed in sea water: these results are presented in the form of tables and plots. (Author)
Advanced Interface Design Using Force Feedback Hand Controllers, Wearable Computers, and Augmented and Virtual Reality Displays( Book )

2 editions published in 1998 in English and held by 1 WorldCat member library worldwide

The objective of the grant was to establish a research laboratory to design and evaluate augmented and virtual reality environments, wearable computers, and haptic displays. To complete these objectives, SGI workstations, force feedback hand controllers, head-mounted displays, wearable computers, a large-screen projection system, and NT workstations were purchased
Numerical Methods for Accurate Computation of Design Sensitivities( Book )

2 editions published in 1998 in English and held by 1 WorldCat member library worldwide

This work is concerned with the development of computational methods for approximating sensitivities of solutions to boundary value problems. We focus on the continuous sensitivity equation method and investigate the application of adaptive meshing and smoothing projection techniques to enhance the basic scheme. The fundamental ideas are first developed for a one dimensional problem and then extended to 2-D flow problems governed by the incompressible Navier-Stokes equations. Numerical experiments are conducted to test the algorithms and to investigate the benefits of adaptivity and smoothing
An analysis of the transient behavior of infiltrated tungsten composites including the effect of the melt layer( Book )

1 edition published in 1969 in English and held by 1 WorldCat member library worldwide

The overall outcome of a certain lanchester combat model( Book )

1 edition published in 1967 in English and held by 1 WorldCat member library worldwide

Theoretical results are given for the probability of victory in a Lanchester model described by deterministic equations. The model is unusual in that both sides deploy only a constant fraction of their initial strengths actually in the field, the remainder being held in reserve and used to replace casualties. This phase continues until only one side can replace, and finally there may follow a phase which is in classical Lanchester tradition with no replacement possible
The oxidation of arsenic (iii) and antimony (iii) by John G Mason( Book )

1 edition published in 1965 in English and held by 1 WorldCat member library worldwide

The kinetics of the Cr(VI)-As(III) reaction have been measured in perchloric acid solutions, acetic acid solutions, acetoc acid-acetate buffers, NH4NO3, and H2PO4 - HPO4 buffers. The reaction shows catalysis by H(+), and HOAc. The general form of the rate laws is given. In phosphate buffers, a Cr(VI).H2PO4 complex is indicated as an oxidizing agent
Basic Research Effort Toward Development of a Vaccine Against Human Brucellosis( Book )

2 editions published in 1998 in English and held by 1 WorldCat member library worldwide

This project identified several potentially protective Brucella antigens: YajC, GroEL, GroES, SOD, SecD, l8kDa, 16kDa and TolB. Some potential virulence factors have also been identified. Antigens have been purified as fusion proteins and/or native antigens for further characterization. Selected antigens have also been cloned into Baculovirus for antigen characterization and immunization purposes. Several vaccinia/Brucella recombinants with selected Brucella antigens have been produced and have been tested in mice. Mice are able to respond to these antigens immunologically but protection has not yet been achieved. New recombinants using more effective early/late synthetic promoters and able to express IL-12 are being constructed to overcome this problem. Vaccinia/listeriolysin and Brucella L7/l12 recombinants are being constructed to assess vector efficacy. To assess the true protective abilities of the selected Brucella antigens, B. abortus vaccine strain RB5l disruption mutants have been constructed and DNA vaccines have been produced. These are being tested in mice for their ability to induce specific immune responses and protection against challenge with virulent Brucella spp
Unmeasured Variables in Path Analysis by Lee M Wolfle( Book )

1 edition published in 1979 in English and held by 1 WorldCat member library worldwide

Structural equation models incorporating unmeasured variables make possible the rigorous testing of theories previously difficult to test adequately because of fallible measures of the theoretic variables. This paper first discusses a simple causal model; incorporating a single unmeasured variable for the purpose of exposition. A substantive example follows, incorporating several unmeasured variables for which multiple indicators were available. Joreskog's lisrel model for the analysis of linear structural relationships was used. The problem studied concerned the processes of educational attainment among several ethnic groups. The most important substantive conclusion was that measurement errors differ between ethnic groups and that ignoring errors leads to biased estimates of structural effects. However, application of lisrel depends on the collection of appropriate data. Unless the data have been collected by appropriate procedures, and unless the model is adequately specified, lisrel is unlikely to produce definitive results. (Author/CTM)
The systematic position of the branchiobdellidae (annelida: clitellata)( Book )

1 edition published in 1965 in English and held by 1 WorldCat member library worldwide

The annelid worms which are epizoic on horartic freshwater crustaceans were considered by their discoverers to be leeches (Odier, 1823). At a later period they were assigned to the oligochaetes (Vejdovsky, 1884; Michaelsen, 1909; Pierantoni, 1912). The question of their affinities has recently been reopened (Franzen, 1963). The author reviews the structure, distribution, and habits of these animals, currently included in the oligochaete family Branchiobdellidae and advances additional reasons for his belief that this family should be elevated to ordinal rank
Behavior Self-Organization in Multi-Agent Learning by John S Bay( Book )

2 editions published in 1999 in English and held by 1 WorldCat member library worldwide

There are four primary results of the first year of the project: It was discovered that clustering algorithms for pre-sorting high-dimensional datasets was not effective in improving subsequent processing by reinforcement learning methods. It was discovered that Bayesian belief networks can be combined with decision nodes and an incremental assessment algorithm to mimic human patterns of data reduction and knowledge representation. The human immunological system was identified as a possible model for a "bidirectional" distributed decision network. Initial work has identified a model-balancing technique, borrowed from linear system theory, that is a strong candidate for a pruning and model reduction method for large modular networks
Microcomputers in Educational Settings: An Annotated Bibliography by Robert G Underhill( Book )

1 edition published in 1982 in English and held by 1 WorldCat member library worldwide

This document provides an annotated bibliography of the microcomputer documents and articles listed in ERIC's Resources in Education (rie) and Current Index to Journals in Education (cije) through December 1981. The references were identified through a search of document abstracts and annotations. The document may be of value to elementary and secondary teachers, graduate students, and college/university faculty who want to locate information on microcomputers. References from rie and cije are listed separately by access number. (Mp)
Multifactorial Assessment of Depleted Uranium Neurotoxicity( )

1 edition published in 2006 in English and held by 0 WorldCat member libraries worldwide

THIS WAS A 5-YEAR PROJECT TO EXPERIMENTALLY ASSESS THE NEUROTOXICOLOGIC POTENTIAL OF EXPOSURE TO DEPLETED URANIUM (DU), AND THE ROLE OF STRESS IN ALTERING THE TOXICITY. THE PROJECT INVOLVED DETERMINATION OF THE TOXICOKINETICS OF DU IN THE BRAIN, DEVELOPMENT OF A RELEVANT STRESS MODEL, AND STUDY OF NEUROTOXIC EFFFECTS OF A SINGLE (ACUTE) EXPOSURE TO SOLUBLE DU AND TO LONG-TERM EXPOSURE TO IMPLANTED PELLETED DU, AND THEIR MODIFICATION BY STRESS. MAJOR FINDINGS IN THE ACUTE STUDY WERE DOSE-RELATED ELEVATED URANIUM IN BRAIN REGIONS, AND TRANSIENT DECREASE IN DOPAMINE IN THE STRIATUM ON POST-DOSING DAY 3 IN THE HIGH DOSE UNSTRESSED ANIMALS. THERE WERE DU-RELATED DECREASES IN MOTOR ACTIVITY, BODY WEIGHT GAIN AND FORELIMB GRIP STRENGTH. TRANSIENT UREMIA FROM DU DOSE-RELATED RENAL TUBULAR NECROSIS WAS ALSO SEEN, AND MAY HAVE CONTRIBUTED TO THESE CLINICAL FINDINGS. STRESS DID NOT ENHANCE THE DU TOXICITY. MAJOR FINDINGS FROM THE LONG-TERM DU-IMPLANTATION/STRESS STUDY WERE DU DOSE-RELATED INCREASED URANIUM CONCENTRATIONS IN SERUM, KIDNEY AND BRAIN REGIONS IN RATS SACRIFICED 6 MONTHS POST-EXPOSURE, UNAFFECTED BY STRESS. DECREASE IN DOPAMINE IN THE STRIATUM AND EPINEPHRINE IN THE CEREBELLUM WERE SEEN IN THE HIGH DOSE DU GROUP, ALSO UNMODIFIED BY STRESS. THESE STUDIES SHOW THAT URANIUM MOBLIIZED FROM PERIPHERAL SITES CAN ENTER THE BRAIN AND HAVE ADVERSE NEUROLOGIC EFFECTS
A Novel Approach for Predicting Sublethal Effects of Toxicants to Aquatic Organisms( )

1 edition published in 1984 in English and held by 0 WorldCat member libraries worldwide

This study compared the effects of water soluble fraction (WSF) of petroleum derived (P) JP-4, a common military and civilian jet fuel, and shale derived (SD) JP-4 on survival, growth, ventilatory rate, preference-avoidance behavior, and tissue of the bluegill sunfish (Lepomis macrochirus) to determine possible interrelationships and to determine which procedures might be possible interrelationships and to determine which procedures might be most descriptive of sublethal stress. Comparative studies were also run using invertbrates and microbial communities. In acute tests, fish were generally more sensitive to jet fuel WSFs than invertebrates. This is consistent with previous observations on the relative toxicity of the major components, benzene and toluene. No major discrepancies occurred in the chronic sensitivities of fish and invertebrates. Fish ventilatory response appeared to be the quickest and most efficient of the sublethal tests used and provided a reasonable estimate of a chronic effect level. Microbial communities responded to low levels of jet fuel exposure, but toxicant related effects would probably be short-lived and of limited consequence in field exposures. Originator supplied keywords include: Toxicity, Lepomis macrochirus, Ventilatory rate, Preference/Avoidance, Microbial Community, Aeolosoma headleyi, Daphnia pulex, Paratanytarsus parthenogenica
Expression of Brucella Antigens in Vaccinia Virus to Prevent Brucellosis in Humans: Protection Studies in Mice( )

2 editions published between 1999 and 2000 in English and held by 0 WorldCat member libraries worldwide

The current work has the overall objectives of genetically engineering mono and poly-valent, IL-12 producing vaccinia/Brucella recombinant vaccines using synthetic E/L promoters and to test such vaccinia recombinants for their ability to induce a protective immune response against challenge with virulent Brucella in a mouse model. For an effective and strongly protective immune response it may he necessary to combine vaccination with vaccinia/Brucella recombinants with the inoculation of DNA vaccines. At this stage the following has been achieved: 1. Demonstrated Brucella Cu/Zn SOD to he a protective antigen. 2. Produced first WRvaccinia/Brucella antigen recombinants simultaneously producing IL-12. 3. Produced first WRvaccinia/Brucella recombinants producing a fusion protein of two protective Brucella antigens (SOD and L7/L12). 4. Initiated protection studies with WRvaccinia/Brucella antigen recombinants producing IL-12. i Detected additional protective Brucella antigens (BMCP24, BaBSC31 and BaPAL16.5) ready for cloning into vaccinia. 6. Produced several Brucella DNA vaccines to he used in combination with WRvaccinia/Brucella antigen recombinants and 7. Initiated production of MVA vaccinia/Brucella antigen recombinants. Based on the identification of protective antigens and the role of IL- 12, we are confident that the use of vaccinia/Brucella recombinants producing IL-12 will induce protective immunity. We are now able to produce such recombinants
New Proton Exchange Membranes for Direct Methanol Fuel Cells( )

1 edition published in 2005 in English and held by 0 WorldCat member libraries worldwide

This three-year research program studied wholly aromatic, optionally fluorinated copolymers with the goal of establishing fundamental data about the complex relationships between PEM chemical structure, morphology, transport properties, and the performance of the DMFC fuel cell membranes. Accomplishments included the generation of lower permeability, high-power density PEM systems. Under ARO funding, we were also successful in scaling the ion containing comonomer in a single step (at the kilogram quantity or higher) as well as demonstrating viable routes for the synthesis of the desired copolymers. This funding also contributed to developing materials for the electrode catalyst layers that show competitive advantages over Nafion. MEAs were prepared, which were characterized by voltage current curves (primarily at LANL) and 300 hours stability at 80 degrees C was demonstrated
Localization of Deformation in Heterogeneous Solids Deformed at High Strain Rates( )

1 edition published in 2005 in English and held by 0 WorldCat member libraries worldwide

Plane strain transient finite thermomechanical deformations of heat-conducting particulate composites comprised of circular tungsten particulates in nickel-iron matrix are analyzed using the finite element method to delineate the initiation and propagation of brittle/ductile failures by the nodal release technique. Each constituent and composites are modeled as strain-hardening, strain-rate-hardening and thermally-softening microporous materials. Values of material parameters of composites are derived by analyzing deformations of a representative volume element whose minimum dimensions are determined through numerical experiments. These values are found to be independent of sizes and random distributions of particulates, and are close to those obtained from either the rule of mixtures or micromechanics models. Brittle and ductile failures of composites are first studied by homogenizing their material properties; subsequently their ductile failure is analyzed by considering the microstructure. It is found that the continuously varying volume fraction of tungsten particulates strongly influences when and where adiabatic shear bands (ASB) initiate and their paths. Furthermore, an ASB initiates sooner in the composite than in either one of its constituents. We have studied the initiation and propagation of a brittle crack in a precracked plate deformed in plane strain tension, and a ductile crack in an infinitely long thin plate with a rather strong defect at its center and deformed in shear. The crack may propagate from the tungsten-rich region to nickel-iron-rich region or vice-a-versa. It is found that at the nominal strain-rate of 2000/s the brittle crack speed approaches Rayleigh's wave speed in the tungsten-plate, the nickel-iron-plate shatters after a small extension of the crack, and the composite plate does not shatter
 
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