Williams, Robert K., 1968-

Title from title page screen (viewed on Feb. 28, 2003). | Thesis advisor: Ralph Kimberlin. | Document formatted into pages (x, 59 p. : ill.). | Vita. | Thesis (M.S.) -- University of Tennessee, Knoxville, 2002. | Includes bibliographical references (p. 46-47). | Mode of access: World Wide Web. | The E-2C aircraft is a Navy carrier based high-wing, twin engine turboprop powered aircraft used for the Airborne Early Warning (AEW) mission. In the power approach configuration, the aircraft displays s...

Balsom, Arianne Lynn, 1976-

Mode of access: World Wide Web. | Title from title page screen (viewed on Sept. 11, 2003). | Thesis advisor: Jacqueline Grebmeier. | Document formatted into pages (xi, 189 p. : ill., maps). | Thesis (M.S.) -- University of Tennessee, Knoxville, 2003. | Vita. | Includes bibliographical references (p. 125-145). | Hydrographic, sediment, and biological (chlorophyll a, bacteria, viruses, and macroinfauna) samples were collected on a several thousand mile long transect spanning from the Gulf of Alask...

Park, Sungho

A bilinear formulation is used fordeveloping the time finite element method(TFM) to obtain transient responses ofboth linear, nonlinear, damped andundamped systems. Also the formulation,used in the h-, p- and hp-versions, isextended and found to be readily amenableto multi-degree-of-freedom systems. Theresulting linear and nonlinear algebraicequations for the transient response aredifferentiated to obtain the sensitivity of theresponse with respect to various designparameters. The present develo...

Bhardwaj, Manoj K.

With advanced subsonic transports and military aircraftoperating in the transonicregime, it is becoming important to determinethe effects of the coupling between aerodynamic loadsand elastic forces.Since aeroelastic effects can contribute significantlyto the designof these aircraft, there is a strong need inthe aerospace industry topredict these aero-structure interactionscomputationally.To perform static aeroelastic analysis in the transonicregime,high fidelity computational fluid dynamics (CFD...

Loverich, James S.

Composite materials are under considerationfor the replacement of steel helical tendons inunbonded flexible pipes utilized by the offshoreoil industry. Higher strength to weight ratiosand increased corrosion resistance are theprimary advantages of a composite materialfor this application. The current study focuseson the life prediction of a PPS/AS-4 carbonfiber composite proposed for the aboveemployment. In order to accomplish this task,the properties of the material wereexperimentally character...

Sun, Jinxia

This research focused on the characterizationof organosilicone surfactants and their effectson sulfonylurea herbicide activity. The projectincluded efficacy tests, rainfastness studies inthe greenhouse, radiotracer studies onherbicide uptake, fluorescent dye studies onsurface deposition, and variousmeasurements of physico-chemicalproperties. In measuring physico-chemicalproperties, a logistic dose responserelationship was found between adjuvantconcentration and contact angle on parafilm.An AsymS...

Shenoy, Ajit R.

The research presented in this dissertation investigates the use of all-at-oncemethods applied to aerodynamic design. All-at-once schemes are usually based onthe assumption of sufficient continuity in the constraints and objectives, andthis assumption can be troublesome in the presence of shock discontinuities.Special treatment has to be considered for such problems and we study severalapproaches.Our all-at-once methods are based on the Sequential Quadratic Programmingmethod, and are designed to...

Schroeder, Philip D.

Economic deposits of heavy mineral sand were identified in the late 1980 s under primefarmland along the Upper Coastal Plain of Virginia. Mining in Virginia will commence in 1997 onthe Old Hickory Deposit in Dinwiddie/Sussex Counties. Experiments were established on twomine pits representing two likely pit closure scenarios; regrading the surface with unprocessedsubsoil (Pit 1) or filling to the surface with processed material (Pit 3). To evaluate topsoilreplacement vs. organic amendment, each p...

MacMillin, Peter Edward

Numerous trim, control requirements andmission generalizations have been made to ourprevious multidisciplinary design methodologyfor a high speed civil transport. We optimizethe design for minimum take off gross weight,including both aerodynamics and structures tofind the wing planform and thicknessdistribution, fuselage shape, engine placementand thrust, using 29 design variables. Whileadding trim and control it was found necessaryto simultaneously consider landing gearintegration. We include t...

Norabuena, Edmundo O.

Arrival times from intermediate-depth(110-150 km) earthquakes within the regionof flat subduction beneath central Peruprovide constraints on the geometry andvelocity structure of the subducting Nazcaplate. Hypocenters for these events, whichare beneath the sub-andean and easternPeruvian basins, were determined using abest-fitting one-dimensional velocity-depthmodel with a 15-station digitally-recordingnetwork deployed in the epicentral region.For that model, P-wave travel times tocoastal station...

Pullela, Sharma V. S.

Abstract (Piaractus mesopotamicus) initiallyweighing 72.0 g were fed three diets - a) 0.5%vegetable (zucchini), b) commercial 32% (P32) andc) commercial 36% (P36) protein diets for 24weeks and their growth performance compared.Processing yields and proximate composition weredetermined following dressing of pacu. Themicrobiological quality of pond cultured pacu wascompared to aquacultured hybrid striped bass,tilapia, and rainbow trout grown in pond andrecirculating aquaculture systems. Sensorial ...

Widjaja, Budi Ryanto

As cold-formed steel decks are used in virtually everysteel-framed structure for composite slab systems, effortsto develop more efficient composite floor systems continues.Efficient composite floor systems can be obtained byoptimally utilizing the materials, which includes thepossibility of developing long span composite slab systems.For this purpose, new deck profiles that can have a longerspan and better interaction with the concrete slab areinvestigated.Two new mechanical based methods for pr...

Mohan, P

Finite element analysis of laminated shells using a three-nodedflat triangular shell element is presented. The flat shell element isobtained by combining the Discrete Kirchhoff Theory (DKT) plate bendingelement and a membrane element similar to the Allman element, butderived from the Linear Strain Triangular (LST) element.Though this combination has been employed in the literature for linearstatic analysis of laminated plates, the results presentedare not adequate to ascertain thatthe element wo...

Gant, Lenora Peters

The purpose of this case study research was to identify the factors and supporting strategies that contribute to the implementation of DL instruction in the two-way audio/video (A/V) electronic classroom (EC). A primary goal of this research was to develop an outline of a DL manual that identifies factors and strategies or subject areas that can be used to: (a) contribute to knowledge in the field of practice, (b) improve practice, and (c) improve the quality and success of DL teaching in the EC...

Gimbert, Norman Wesley II

A real need exists for a sensor capable of detecting flow-field separation on an airplanewing during routine flight operations. A sensor of this type could lead to both improvedflight safety and increased performance. It would also contribute to future separationcontrol technologies. A new idea is presented for a sensor that is cost effective, easy tomaintain, durable, and highly effective. The system, known as a Thermal Grid, works byusing a grid of heaters and temperature sensors to trace out ...

Ciochetto, David S.

The extension of the theory for two dimensional turbulent boundary layers into three dimensional flows has met with limited success. The failure of the extended models is attributed to the anisotropy of the turbulence. This is seen by the turbulent shear stress angle lagging the flow gradient angle and by the behavior of the Reynolds shear stresses lagging that of the mean flow. Transport equations for the turbulent shear stresses were proposed to be included in a modeling effort capable of acco...

Jacobson, Peter James

Hydrologic and material dynamics of ephemeral rivers were investigated in the Namib Desert to assess how hydrologic regimes shape the physical habitat template of these river ecosystems. An analysis of long-term hydrologic records revealed that the variation in mean annual runoff and peak discharge were nearly four times higher than the global average, rendering the rivers among the most variable fluvial systems yet described. Further, a pronounced downstream hydrologic decay characterized all o...

Haramis, John Emmanuel II

Two different asphalt concrete systems were examined in this research study. The existing system, consistent with current timber bridge construction practice, uses a preformed waterproofing membrane placed on a preservative treated wood deck overlaid with a bituminous concrete wearing surface. The second system consists of a treated wood deck overlaid with a base course of bituminous concrete, a waterproofing membrane, and a bituminous concrete wearing surface.<P>The testing regime...

Tyll, Jason Scott

A multidisciplinary design optimization (MDO) methodology is developed to linkthe aerodynamic shape design to the system costs formagnetically levitated (MAGLEV) vehicles.These railed vehicles can cruise at speeds approaching that of shorthaul aircraft and travel just inches from a guideway.They are slated for high speed intercity service of up to 500miles in length and would compete with air shuttle services.The realization of this technology hinges upon economic viability which isthe impetus f...

Knill, Duane L.

A method to efficiently introduce supersonic drag predictions fromcomputational fluid dynamics (CFD) calculations in acombined aerodynamic-structural optimization of a High-Speed CivilTransport (HSCT) is presented.To achieve this goal, the method must alleviate the large computationalburden associated with performing CFD analyses and reduce thenumerical noise present in the analyses.This is accomplished through the use of response surface (RS)methodologies, a variation of the variable-complexity...

Long, Luohui

A hierarchical approach is typically followed in design of consumer products. First, a manufacturer sets performance targets for the whole system according to customer surveys and benchmarking of competitors products. Then, designers cascade these targets to the subsystems or the components using a very simplified model of the overall system. Then, they try to design the components so that they meet these targets. It is important to have efficient tools that check if a set of performance targets...

Stagg, Gregory A.

Harmonic oscillatory tests for a fighter aircraft using theDynamic Plunge--Pitch--Roll model mount at Virginia Tech StabilityWind Tunnel are described. Corresponding data reduction methods aredeveloped on the basis of multirate digital signal processing. Sincethe model is sting mounted, the frequencies associated with stingvibration are included in balance readings thus a linear filter mustbe used to extract out the aerodynamic responses. To achieve this, aFinite Impulse Response (FIR) is design...

Ling, Qi

Design of Automotive Joints Using Response SurfacePolynomials and Neural NetworksbyQi LingCommittee Chairman: Efstratios NikolaidisAerospace and Ocean Engineering(ABSTRACT)In the early design stages of a car body, a simplified model,which represents the constituent components of the car body by theirperformance characteristics, is used to optimize the overall car.The determined optimum performance characteristics of the componentsare used as performance targets to design these components. Sinced...

Schultz, Marc Robert

The energy absorption capacity of a series of axially crushed composite tubes fabricated from high tow count graphite fiber is compared with those of similar tubes fabricated from aerospace-grade fiber to determine the viability of considering the use of such fibers in automotive applications. To that end, graphite-epoxy tubular specimens with circular and square cross-sectional geometries; stacking sequences with ��45�X fibers and with both ��45�X and 0�X fibers; and two different fiber types w...

Pyc, Wioleta Agata

FIELD PERFORMANCE OF EPOXY-COATED REINFORCING STEEL IN VIRGINIA BRIDGE DECKSWioleta A. Pyc(Abstract)The corrosion protection performance of epoxy-coated reinforcing steel (ECR) was evaluated in 18 concrete bridge decks in Virginia in 1997. The decks were 2 to 20 years old at the time of the investigation. The concrete bridge deck inspections included crack survey and cover depth determination in the right traffic lane. Maximum of 12 cores with the top reinforcement randomly located in the lowest...

Bonhaus, Daryl Lawrence

The Streamline Upwind/Petrov-Galerkin (SU/PG) method is applied to higher-orderfinite-element discretizations of the Euler equations in one dimension and the Navier-Stokesequations in two dimensions. The unknown flow quantities are discretized onmeshes of triangular elements using triangular Bezier patches. The nonlinear residualequations are solved using an approximate Newton method with a pseudotime term. Theresulting linear system is solved using the Generalized Minimum Residual algorithm wit...

Glaze, Michelle L.

Control Allocation addresses the problem of the management of multiple, redundant control effectors. Generally speaking, control allocation is any method that is used to determine how the controls of a system should be positioned to achieve some desired effect. An infinite number of allocation methods exist, from the straight-forward direct allocation technique, to the daisy chaining approach, to the computationally simple generalized inverse method. Because different methods have advantages and...

Somjetlertcharoen, Amornchai

Ceftiofur sodium, a third generation cephalosporin, was studied to determine the potential of this drug as an alternative bacterial therapeutic agent for the aquaculture and ornamental fish industry. Grass carp, Ctenopharyngodon idella have been selected as the fish model for this study since they are a good representative for both foodfish andornamental fish and are one of the major species grown worldwide.Pharmacokinetics of ceftiofur sodium after various routes of administration, histopatholo...

Nielsen, Eric John

A discrete adjoint method is developed and demonstrated for aerodynamic design optimization onunstructured grids. The governing equations are the three-dimensional Reynolds-averagedNavier-Stokes equations coupled with a one-equation turbulence model. A discussion of thenumerical implementation of the flow and adjoint equations is presented. Both compressible andincompressible solvers are differentiated, and the accuracy of the sensitivity derivatives is verifiedby comparing with gradients obtain...

Long, Matthew Robert

The problem of reorienting a spacecraft to acquire a moving target is investigated. The spacecraft is modeled as a rigid body with N axisymmetric wheels controlled by axial torques, and the kinematics are represented by Modified Rodriques Parameters. The trajectory, denoted the reference trajectory, is one generated by a virtual spacecraft that is identical to the actual spacecraft. The open-loop reference attitude, angular velocity, and angular acceleration tracking commands are constructed so ...

Robbins, Andrew Campbell

Pilot Induced Oscillations (PIO) are described as pilot-aircraft dynamic couplings which can lead to instability in an otherwise stable system. Previous and ongoing research has attempted to explain, predict, and avoid such oscillations. In contrast to other research, this effort backs away from pilot models and PIO avoidance and focuses on the characteristics of the pilot before, during, and after a PIO. Often, PIO s can be explained by limit cycles occurring in a non-linear system where the no...

Giles, Inez Marie

Three questions guided this research study: a) Is Goal Accomplishment Style, as measured by Atman s Goal Orientation Index (GOI), related to persistence and dropout in an online, computer-conferenced class? b) Is there a relationship between other selected variables (Demographic, Personal, Institutional, and Participative) and student persistence or dropout in the online, computer-conferenced environment? And, c) Can a relationship between goal accomplishment style and the other selected student...

Mayhew, David McNeil

With the advent of the Global Position System (GPS), we now have the ability todetermine absolute position anywhere on the globe. Although GPS systems work well inopen environments with no overhead obstructions, they are subject to large unavoidableerrors when the reception from some of the satellites is blocked. This occurs frequently inurban environments, such as downtown New York City. GPS systems require at leastfour satellites visible to maintain a good position fix. Tall buildings and tunn...

Cummings, Angela R.

In recent years, the success of wetland mitigation projects and their ability to function as natural systems has been questioned. This study was conducted (i) to characterize and examine differences between mitigation and natural wetlands, (ii) to examine differences in soil morphology along a wetness gradient in mitigation and natural wetlands, and (iii) to observe changes in mitigation wetlands with time. Site characteristics, including soil properties, hydrology, and vegetation, were analyzed...

Misheloff, Jane

<p><b>Policy Jolts in U.S. Arms Transfers:The Post-Cold War Security Environment</b></p><p>Jane Misheloff</p><p>(ABSTRACT)</p><p>This research addresses the subject of conventional arms transfers in the Post Cold War Era. ("Conventional arms" herein are defined as high cost, state-of-the-art weapons systems in aerospace, land vehicles, missiles and naval vessels...

Cyterski, Michael John

This investigation examined the adequacy of the forage base to meet current demand of piscivores in Smith Mountain Lake, Virginia. Surplus production, or the maximum sustainable supply, of alewife (Alosa pseudoharengus) and gizzard shad (Dorosoma cepedianum) were determined using data on the biomass, growth, and mortality of each species. Mean hydroacoustic alewife biomass from 1993-1998 was 37 kg/ha and mean gizzard shad cove rotenone biomass from 1990-1997 was 112 kg/ha. Mean annual alewife su...

Granville, Monique V. IV

The publisher of the Degrees of Reading Power test of reading comprehension(DRP) calibrate their test using an item response model called the Rasch orone-parameter logistic model. The relationship between the use of the Rasch modelin calibration of the DRP and the use of the DRP as a component of the VirginiaLiteracy Passport Testing Program (LPT) is addressed. Analyses concentrate onsixth grade students who were administered the DRP in 1991. The question thatarises is whether the Rasch model is...

Lennox, William J

ISOLATION, CHARACTERIZATION, AND MOLECULARMODELING STUDIES ON DITERPENES FROM MARINEORGANISMS WITHIN THE EUNICEA GENUSWilliam J. LennoxMass spectrometry was used in conjunction withnumerous 1-D and 2-D NMR techniques to determinethe structures, devoid of stereochemistry, of fivedifferent compounds isolated from the extracts ofEunicea succinea, Eunicea tourneforti, and anunidentified species isolated from the Euniceagenus by Professor Meledath Govindan, of theUniversity of the Virgin Islands. Thr...

Waltz, Christopher S.

The Outer Banks are a special place at the end of land and the beginning of water, and yet, most of the houses built on these islands seem to take no notice. A drive down the beach road reveals house after house that are essentially suburban dwellings raised above flood level on piles. This project proposes that oceanfront homes should not be pale imitations of inland housing, but rather as unique as the environment in which they exist. The architect must design for the long term needs of the cl...

Fletcher, William P. Jr.

THE DEVELOPMENT OF A BLOCK SCHEDULING EVALUATION MODELWilliam P. Fletcher, Jr.(ABSTRACT)The purpose of the study was to develop and test a block scheduling evaluation model. Conceptual development of the model was based on a review of the literature which targeted the components of the school program most consistently identified with scheduling type: instruction, school climate, student outcomes, and operating efficiency. The model included an interview with the principal, analysis of documents,...

Hsu, Tseng-Hsing

An extension of the original Ott-Grebogy-Yorke control scheme is used on a simple double pendulum. The base point of the double pendulum moves in both horizontal and verticaldirections which leads to rather complicated behavior.A delay coordinate is used toreconstruct the attractor. The required dimension is determined by the FalseNearest Neighbor analysis. A newly developed Fixed Point Transformation method is used to identify the unstable periodic orbit (UPO). Two different system parameters a...

Roach, John Paul

Trace Metals in Fish from a Reservoir Receiving Runoff from a Developing Watershed<p>John P. Roach<p>(ABSTRACT)<p>The objective of this research was to measure the concentrations of the cadmium, chromium, copper, lead, mercury and zinc in bass and carp taken from the Occoquan Reservoir in Virginia with three purposes in mind. First, to determine whether the amounts of metals present represent any hazard to humans when the fish are used as food. Second, t...

Romberg, William John

Market Segmentation, Preferences, and Management Attitudesof Alaska Nonresident Anglers.William J. Romberg(ABSTRACT)Nonresident angler participation in Alaskan sport fisheries has increased at a higher rate than resident participation during the past decade. Popular sport fisheries have become crowded and stakeholder groups are increasingly concerned about the future direction of Alaska sport fisheries management. To address stakeholder concerns in an informed manner, the Alaska Department of Fi...

Rivera, Jorge H. Vega

The postbreeding period in migratory bird species is an important, but often neglected,area of knowledge. From May-October of 1993-95, I studied the breeding andpostbreeding ecology of 61 adults and postfledging movement of 43 juveniles in aradio-tagged population of Wood Thrushes (Hylocichla mustelina) on the U. S. MarineCorps Base, Quantico, Virginia (38 30 N, 77 25 W). Fledglings became independent 0 0from their parents at 28-36 days post hatching and dispersed 307-5300 m from their natalsite...

Vines, John Vines Ashley

This study documents the deformation history of the Santa Rita Flat pluton, eastern California, from the time of emplacement to post-emplacement transpressional shearing, and consists of manuscripts that make up three chapters. The first chapter addresses the emplacement of the Santa Rita Flat pluton using anisotropy of magnetic susceptibility (AMS). The second chapter describes the kinematic analysis of cross-cutting shear zones within the western margin of the pluton. The third chapter is an i...

Coffey, Brian Perry

The sequence stratigraphic development of the subsurface Paleogene, Albemarle Basin, North Carolina, was defined using well cuttings and wireline logs tied into largely published biostratigraphic and available seismic data. Facies include: silty and shelly sands and shell beds (estuarine/lagoon/protected inner shelf facies); clean quartz sands and sandy mollusk-fragment grainstones (shoreface/shallow shelf); phosphatic hardgrounds (current and wave-swept shoreface and shallow shelf); bryozoan an...

Maynard, Joel Phillip

The Upper Mississippian (Chesterian) Bluefield Formation of southeastern West Virginia and southwestern Virginia is the basal unit of the Mauch Chunk Group, a succession of predominantly siliciclastic strata sourced from actively rising tectonic highlands east of the Appalachian Basin. The Bluefield Formation conformably overlies shallow-marine carbonate units of the Greenbrier Group, and is unconformably overlain by incised fluvio-estuarine facies of the Stony Gap sandstone member (Hinton Forma...

Trout, Alvin McKinley

<CENTER><H2>FURTHER STUDY OF THE GRAVITY LOADING BASE TEST METHOD</H2>Alvin M. Trout<BR>(ABSTRACT)</CENTER><P>Presently, the industry accepted method for determining the positive momentstrength of gravity loaded standing seam metal roof systems is the Base Test Method.The Base Test Method provides a means for determining the positive moment strength ofa multiple span, multiple purlin line standing seam roof syste...

GU, WENJIONG

A Displacement Based Optimization (DBO) approach was applied to truss design problems with material nonlinearities, to explore feasibility and verify efficiency of the approach to solve such problem. Various truss sizing problems with holonomic (path-independent) elastoplastic laws were investigated. This type of material nonlinearity allows us to naturally extend the linear elastic truss sizing in the DBO setting to nonlinear problems. A computer program that uses the commercially available opt...

Anders, Richard Lee

On-Road Investigation of Fluorescent Sign Colors to Improve ConspicuitybyRichard Lee Anders(ABSTRACT)This thesis documents Phase III of a research program undertaken by the Virginia Transportation Research Council and the Virginia Tech Transportation Institute in cooperation with the 3M Company and the Virginia Department of Transportation for the evaluation of visual performance of retroreflective signs of various color combinations. Phase I was an off-road field experiment conducted to determi...