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Comparison Of Equivalent Three And Five Phase Brushless Dc Motors : Evaluation Of Torque Production For Inverter Failures In One Phase, Brian Lain

Masters Theses

In this study the post-failure torque production of three-phase and five-phase brushless dc motors is compared for inverter single phase failures. Brushless dc motors are conventionally configured as three-phase motors, however a five-phase brushless dc motor can produce more torque after a single phase failure. To allow equitable comparison of these two systems an "equivalent" basis is established. The "equivalent" systems will be equal with respect to physical size, dc supply voltage, dc supply current, rated power, and rated torque. After a failure in the inverter the three-phase and five-phase systems have different abilities to produce torque. Two types of …

Kingship In The Poetry Of The Anglo-Saxon Chronicle, Steven P. Harthorn

Masters Theses

The Anglo-Saxon Chronicle contains among its prose entries several poems which appear between the years 936 and 1104. Almost all of these poems are united by the theme of kingship, which dominates the Chronicle as a whole but receives even closer attention in the poetry. The Chronicle-poems display various attitudes about the kingship: some highly favorable, others critical, and many mixed in their opinions. In this manner, they maintain thematic continuity with the rest of the Chronicle, but amplify its values through rhetorically heightened expression. The plan of this study is as follows. First, we shall briefly consider …

Impacts Of Hypothetical NoX Sources On Ozone Formation In East Tennessee, Mamun Ahmed

Masters Theses

This thesis studied the effects of hypothetical NO_x sources located in East Tennessee on the tropospheric ozone concentrations impacting the Great Smoky Mountains National Park (GSMNP) using the Urban Airshed Model (UAM). The product of this study is a technique of assessing the potential impact of a new or modified large NO_x source on ozone concentrations within a Class I area, which includes and up-to-date detailed emissions inventory. The East Tennessee Modeling Domain (ETMD) consists of 94 counties in six different states with an area of 75,900 km²: Tennessee (40), North Carolina (22), South Carolina (8), …

The Effect Of University Characteristics On The Bicycle Transportation Mode And Helmet Usage, Carlton C. Urban

Masters Theses

By performing a statistical analysis on data collected from the Internet, this study sought to determine if designated characteristics of a university actually affect the bicycle transportation mode and helmet usage on college campuses. The focus group for this research experience involved bicycle commuters affiliated with universities in the United States. Through the establishment of a World Wide Web home page and on-line survey, the author obtained data concerning estimated bicycle and helmet usage percentages, and campus characteristic data from bicyclist responses. The Internet was used as an innovative approach to collecting data. Essentially the participant would simply locate the …

An Ecological Assessment Of Wetland Mitigation Projects In East Tennessee, Kim Pilarski

Masters Theses

Federal wetland protection regulations stipulate that developers who destroy natural wetlands are required to construct mitigation or replacement wetlands. Despite the frequency of wetland mitigation, few studies have evaluated the ability of mitigated wetlands to mimic the ecological function and community composition of natural wetlands. Fewer still compare mitigation sites with existing natural wetlands in the same ecological region.

Studies from other freshwater habitats suggest that comparisons of the ratios of functional feeding groups (FFGs) of benthic macroinvertebrates (i.e., shredders, scrapers, collectors, predators) may provide useful information about the ability of mitigated wetlands to mimic the ecological functions of natural …

A Study Of Histological Aging Of The Human Clavicle, Nikki L. Rogers

Masters Theses

This study attempted to augment the Stout and Paine (1992) and Stout and colleagues' (1996) methods of histological aging for the clavicle. In the 1992 study, the predictive equation was generated from a sample of only 40 individuals taken from an autopsy population (mean ages 28.6 years) with no prior sampling strategy. The 1996 expansion (Stout et al., 1996) tested the 1992 equation, added 41 males and 42 females from a Swiss cemetery sample to the original autopsy sample to generate a new predictive equation based on all 123 individuals.

In this study, an independent autopsy population was used to …

Comparison Of Forest Stand Edges In Riparian And Mesic Habitats Along Watts Bar Reservoir Shoreline, Ruth Anne Hanahan

Masters Theses

Approximately fifty years ago, the landscape upslope from the natural, riverine position banks of the Tennessee River was inundated by the closing of Watts Bar Dam. On the currently forested shoreline, habitats within the direct influence of the reservoir pool are riparian. Those above that influence are mesic. The purpose of this research was to determine compositional and structural differences between edges of mature forest stands established in a riparian habitat and those established in a mesic habitat along Watts Bar Reservoir shoreline.

Thirty quadrats were placed on shoreline sites with mature, minimally-disturbed forest stands: 15 in a riparian habitat …

Cryogenic Fluid Vertical Line Quench : Characterization, Validation, And Qualitative Analysis Of A Reduced Gravity Experiment, Jerry Franklin Fairchild

Masters Theses

Data collected from an experimental apparatus to study transient flow boiling effects (quenching) were analyzed. Data included tube wall temperatures and fluid pressures gathered by thermocouples and pressure transducers during the upflow of liquid nitrogen in hot vertical stainless steel and quartz tubes. Attempts were made to characterize system performance and validate previously made assumptions. Qualitative comparisons were made between reduced gravity tests performed on NASA's KG-135 and current ground tests. Differences between terrestrial and reduced gravity quench processes are presented and discussed. Recommendations for future studies are also provided which included additional reduced gravity tests with a better instrumented …

Automated Testing Facility For Television Industry, Roxanna Ganji

Masters Theses

This thesis is the result of a research project on an Automated Testing Facility (ATF) for the television industry. The purpose of this project is to provide the industry with on automatic system for measuring television performance from different points of view. Manual methods for measuring television performance have been used for years, and they have become standard industrial practice. However, manual processes limit the volume and consistency of the measurements. Therefore, the ATF project converts the manual procedures to automated ones using the LabVIEW graphical programming language. This thesis reviews the background of the ATF project and studies the …

The Effect Of A Puppet Presentation To Teenagers On Attitudes And Family Communication Regarding Organ Donation, Rebecca Venable Ferguson

Masters Theses

In this quasi-experimental design study an intervention of an interactive puppet program (Kids on the Block) was used to examine the effect it has on initiating and stimulating conversation about organ donation within families. It was also used to see if attitudes and knowledge of organ donation could be modified. The sample population was from driver's education classes in five high schools in Knox County, Tennessee (4 public; 1 private religious). A total of 314 students between the ages of 15 and 17 (n_control = 145; n_experimental = 169) participated. A pre- and posttest were administered with the …

Liquid-Liquid Extraction In A Batch Agitated Vessel With A Non-Newtonian Dispersed Phase, Charlotte M. Farmer

Masters Theses

Chemical industry utilizes solvent extraction as an alternative to conventional distillation, specifically for the separation of liquid mixtures with unfavorable vapor-liquid equilibria relationships and/or thermally unstable components. Common to most extraction applications (i.e., mixer settler, multistage tower extractors, rotating disc contactors, etc.) is the transfer of material taking place to or from drops of one liquid dispersed in another. Thus, a more complete knowledge of the factors affecting transfer to and from drops is essential to further understanding extraction and the development of improved design principles. An extensive literature search indicates that much work has been done over the years …

Similarity And Features Of Natural Textures, Christopher Michael Heaps

Masters Theses

Several features responsible for attentive texture similarity have been proposed, but exactly which ones are important for attentive texture perception and classification is unclear. The purpose of the present investigation was to determine if features are used to judge the attentive similarity of natural textures, and if so to identify these features and establish what type of model is best for conceptualizing them. Subjects in two experiments placed pictures into groups however they wished. Other groups of subjects described the resulting clusters and MDS dimensions, identified the objects/surfaces depicted in the pictures, and ranked the pictures along several hypothesized attribute-based …

Aligning Quadrilateral Elements With Principal Stress Directions, Philip Warren Howell

Masters Theses

In the finite element method as applied to structural mechanics it has been observed that four-node quadrilateral elements (Q4's) tend to perform well when they are aligned with directions of principal stresses. This seemed to suggest that Q4's had poor behavior when placed in shear and that they would therefore perform better when they were aligned with the principal directions. It is also well known that Q4's perform best when they have near right angles at the corners and near one-to-one aspect ratios. It was speculated that the constraint on aspect ratio might be reduced if the shear were eliminated …

Shear Strength Testing And Fractal Analysis Of Rock Discontinuities, Matthew Byron Haston

Masters Theses

The shear strength of rock joints is an important concept in civil engineering and in the geosciences. Shear strength of rock joints is developed by the sliding of two planes of a rock mass over one another. The peak shear strength for any given normal stress has been shown to be related to the base friction angle, the unconfined compressive strength, and the magnitude of roughness of a rock discontinuity. To help reduce the costs associated with testing, models have been developed to predict the peak shear strength of rock joints. Some of these models have been accepted for use …

Design And Analysis Of A Low Cost Capacitive Liquid Level Sensor, Benjamin Neal Lease

Masters Theses

This paper presents a concept for a low cost, capacitive liquid level detector for use in under hood automotive applications. Current sensors for liquid level detection employ float switch technology. This technology is highly vibration sensitive, and limited in cycle life due to the contacting nature of the reed switch. The proposed sensor detects the presence of liquid by discriminating the change in dielectric constant of the media on the sensor probe. A solid state output is provided eliminating cycle life problems. The entire sensor is constructed from a printed circuit assembly and two plastic parts which are ultrasonically welded …

Interaction Of Retinoblastoma Gene Product With Transcription Factors Atf-A And Atf-2, Huo Li

Masters Theses

The retinoblastoma gene product (pRb) plays an important role in constraining cellular proliferation and in regulating the cell cycle. pRb's regulation of the expression of transforming growth factor β2 (TGF-P2), an inhibitory growth factor gene, was suggested to be mediated by Activating Transcription Factor 2 (ATF-2)(Kim et al., 1992), Factor a (ATF-a) (Gong et al., 1995), and their DNA target element (ATF site: CGTCA) in the TGF-P2 promoter. The differential regulation of TGF-P2 promoter activity (first observed by Gong et al., 1995) by pRb has been explored in more depth and the functional interaction sites of ATF-2 and ATFa on …

Archaeological Investigations At Two 19th Century Farmsteads In Rhea And Roane Counties, Tennessee, Charles Alan Longmire

Masters Theses

The Upland South pattern of spatial organization has long been associated with Euroamerican, specifically Scots-Irish, farmstead arrangement in the interior Southeastern United States. Recent archaeological investigations along the Cumberland Escarpment in the East Tennessee Valley have provided a look at two 19th century farmsteads which can be added to the body of archaeological knowledge in this region. This thesis is an in-depth report of archaeological investigations at these two farmsteads. One of these sites, 40RE192, was initially thought to be an early 19th century Euroamerican farmstead dating circa 1820 to 1840. Further analysis has cast doubt on this interpretation. The …

Microbial Control In Industrial Water Recycle Systems, Oscar Lee Martin

Masters Theses

Industrial water recycle systems (e.g. cooling and clarification systems) provide an ideal environment for the proliferation of microorganisms. Common microorganisms within these systems include algae, aerobic bacteria, anaerobic bacteria, and fungi. These microbes contribute to biological fouling and microbiologically influenced corrosion. These problems contribute to reduced cooling, routine cleaning, equipment replacement, and treatment. To reduce the potential for these problems, an effective microbial control program must be implemented. An approach that considers the modification of the existing microbial control program before implementing a new program was applied to the problem. When selecting a new microbial control technology, one must consider …

Equivalent Sphere Approximations For Skin, Eye, And Blood Forming Organ Dose Estimation In Space Radiation Protection Studies, William Littell Maxson

Masters Theses

Throughout the manned space flight program, protecting astronauts from space radiation has been the subject of continuous and intense study. For interplanetary crews, the two main sources of radiation hazards are solar particle events (SPEs) and galactic cosmic rays (GCR). Solar particle events are composed mainly of high fluxes of protons, neutrons, deuterons, tritons, He-3, and alpha particles which can provide an acute exposure of 200 to 300 cSv from a single event. The galactic cosmic rays are composed of much lower fluxes of high-energy, high-LET, heavy ions which provide stochastic exposures of 12 -15 cGy/yr or 40 - 50 …

Adhesion Of Retrovirally Transduced Endothelial Cells To Expanded Polytetrafluoroethylene Vascular Grafts, Kelly Rae Morgan

Masters Theses

Seeding small inner diameter vascular grafts with endothelial cells genetically modified to secrete anticoagulant proteins offers a means in which to improve graft patency. The endothelium is an attractive site for gene transfer due to its proximity to circulating blood. Previous in vivo and in vitro animal studies using naive cells seeded onto vascular grafts have demonstrated promising results. However, genetically modified ECs appear impaired in their ability to adhere to synthetic graft materials under in vivo and in vitro flow conditions. This study addresses the issue of retrovirally transduced EC adhesion to expanded polytetrafluoroethylene (ePTFE) vascular grafts. Human umbilical …

Modeling Of The Hydrologic Transport Of Mercury In The Upper East Fork Poplar Creek (Uefpc) Watershed, Barry P. Moran

Masters Theses

This study evolved out of the Oak Ridge Y-12 Plant's requirement to comply with the NPDES permit. The permit will limit mercury loads to 5 grams per day for water leaving the Y-12 Plant at Station 17 based on average daily values for a 3-month period in order to reduce the exposure risk to humans, animals and aquatic life. The NPDES permit allows mercury loads produced from flows greater than 15 million gallons per day (MOD) to be excluded from the calculations. Storm event flows frequently exceed 15 MGD and are capable of producing plant-wide mercury loadings of hundreds of …

An Evaluation Of The Traffic Alert And Collision Avoidance System For T-1a Cell Formation Stationkeeping, Edwin V. Odisho

Masters Theses

The United States Air Force Headquarters Air Education and Training Command (HQAETC) desired the capability to accomplish limited cell formation training with the T-1A Jayhawk jet transport aircraft in instrument meteorological conditions (IMC), using the Traffic Alert and Collision Avoidance System (TCAS). Traffic Alert and Collision Avoidance System is a family of airborne devices that function independently of the ground-based air traffic control system, and provide collision avoidance for a broad spectrum of aircraft types.

Testing was conducted using two T-1A Jayhawks, provided by AETC. The general test objective was to evaluate the feasibility of using the TCAS to execute …

Synthesis Of Anion Exchange Resins For Selective Complexation Of Pertechnetate Ion, Vijay T. Patel

Masters Theses

Anion exchange resins were synthesized by functionalizing polymer supports with different crosslink densities. A variety of amines, including trialkylamines, with different alkyl-chain lengths were used as the ligands in the synthesis of monofunctional and bifunctional resins. The resins were characterized by total anion exchange capacities (TAEC), percent solids of the resins, chlorine and nitrogen elemental analyses. The results show that as the alkyl-chain length of the trialkylamine increases, the degree of functionalization decreases. An increase in alkyl-chain length also contributes to an increase in hydrophobicity, resulting in slow accessibility. Bifunctional resins were synthesized with two different trialkylamines on a 5% …

Biosynthesis And Chemical Constants Of Mono-Acylated Anthocyanins, Marc Redus

Masters Theses

In this study, a number of non-natural anthocyanins were biosynthesized by the addition of various organic acids to suspension cultures of wild carrot. This resulted in the incorporation of the organic acid residue in a specific place on the anthocyanin molecule, and the resulting novel anthocyanin was purified and characterized. The color of anthocyanins generally decreases with increasing pH due to the conversion of the flavylium ion into a hemiacetal. In addition, the flavylium ion can be converted into blue quinonoid forms at increased PH. Because these reactions result in loss of or changed color of the anythocyanins, their rate …

The Effects Of Saccharomyces Cerevisiae Culture On Performance, Ileal Microflora, Yeast, Fermentation Acids, Ph, Dry Matter And Immune Status Of Weanling Pigs, Chad Martin Robbins

Masters Theses

In three replicate trials, a total of 36 cannulated pigs were used to determine the effects of a Saccharomyces cerevisiae culture, included in a phase diet, on performance, ileal microflora, yeast, short- chain fatty acids, and IgG concentrations in the weanling pig. Pigs were weaned at 17 days of age and randomly assigned to one of three treatments: 1) a pelleted, commercial phase-based diet (C), 2) a similar phase diet with the inclusion of a live S. cerevisiae culture at 1g/kg of the diet prior to pelleting (T1), and 3) a similar mash diet containing a live S. cerevisiae culture …

A Variety Index For Toddlers : Development And Application, Dana Rae Robertson

Masters Theses

When embarking upon the development of an index of dietary variety for toddlers, several issues must be considered. The first issue is which food guide or pattern will be used as a model for variety. A second issue is what method will be used to assess dietary intake; considerations include the type of information desired, the amount of time available for collection, resources available, the degree of accuracy desired, and characteristics of the population. After information is collected, the way the data are analyzed is another consideration in the formation of an index of variety. If accurate quantification of variety …

A Development Environment For Reconfigurable Computing, Zijun Shen

Masters Theses

Reconfigurable Computing is a cutting-edge technology used in VLSI and FPGA design and it refers to a system that contains hardware whose functional- ity can be changed many times. In this thesis, the author establishes a complete set of design paths to do reconfigurable computing using the Engineers' Virtual Computer (EVC); proves established methods; and develops both hardware and software designs to evaluate differences in execution time between them. This is done by running hardware designs on the EVC and simultaneously executing soft- ware equivalent designs on a Sun Sparc 10 station. The hardware and software designs are developed using …

Development Of A Multiplicity Discriminator For High Energy Physics Experiments, Randall Scott Smith

Masters Theses

A current output multiplicity discriminator for use in the front-end electronics (FEE) of the Multiplicity Vertex Detector (MVD) for the PHENIX detector at RHIC has been developed in the Orbit Semiconductor 1.2 µ CMOS, n-well process. Requirements for the multiplicity discriminator include low-power, small area, high speed and common threshold matching. Additionally the discriminator must trigger on input signals ranging from 0.25 MIP(20 mV for the detector) to 5 MIP. Frequency response of the discriminator is such that the circuit is capable of generating an output for every detector beam crossing (105 ns). One channel of multiplicity discriminator occupies an …

On The Reconstruction Of Transient Automotive Emissions : An Application Of Generalized Predictive Control Theory, David Estes Smith

Masters Theses

Due to increasing interest in the emissions-producing characteristics of today's automobiles, emissions testing procedures have come under close scrutiny. In addition, development of procedures to measure emissions of vehicles operating in "on-road" conditions have been proposed to gain knowledge of the instantaneous mass flow rates of various legislated gaseous emissions. The problem with the measurement of instantaneous flow rates is that the response of modern emissions analyzers are too slow for reliable results. Therefore, a method for improving the response of these instruments is needed.

A method is described which utilizes generalized predictive control theory concepts in conjunction with system …

Building Basketball Success In Big Orange Country : The Ray Mears Era In Tennessee Basketbell, Jeffrey J. Storey

Masters Theses

This work focuses on the Ray Mears era as coach in the basketball history at The University of Tennessee, 1962-1978. The description and analysis of this era was the focus of this study. An effort has been made to answer why this era was significant in the history of athletics at the school and to analyze the qualities associated with Ray Mears that allowed this period to be deemed successful. Oral interviews and newspapers were the main sources utilized in the gathering of data. Through the analysis of these sources the conclusion can be drawn that the qualities Mears possessed …