Digital Commons Network^™

Protective Coating Of Titanium Diboride Reinforcement Particulates For Improvement Of Titanium Metal Matrix Composite Armor Systems, Robert Cody Pack

Masters Theses

Titanium and titanium diboride (TiB₂) are two materials that have attracted interest for application in armor systems. Titanium exhibits a high strength-to-weight ratio and good corrosion resistance while TiB₂ exhibits high hardness and stiffness. Combining these into a titanium metal matrix composite would allow the superior ballistic properties to be taken advantage of in one composite material and lead to an improved armor system. The main obstacle behind doing so is the detrimental in situ reaction during processing between the Ti matrix and the TiB₂ reinforcing particles that converts TiB₂ into TiB. It was hypothesized …

An Analysis Of Methodological Differences In Longitudinal Studies Of Infant Manual Preference, Sabrina Lynn Thurman

Masters Theses

Studies on infant manual laterality can be very similar in terms of the goals of the research, but they often show wide variability in several aspects of methodological approaches. This can be problematic when researchers directly compare findings from studies that employ different methodologies. The most common methodological inconsistencies are how many trials are utilized, which behaviors are observed, and how bilateral behaviors are addressed in computations. Here we aim to address whether methodological differences can lead to dissimilar conclusions about patterns in infant manual behaviors like laterality and coupling for three versus eight trials, reach versus grasp actions, and …

Dawning Revelation: An Examination Of Developments That Culminated In Estes Kefauver’S Emergence As Political Tv Star, Jamie Edward Bumpus

Masters Theses

Because of his role as chairman of the Senate crime investigating committee, which held widely viewed hearings in March 1951, U.S. Senator Estes Kefauver has been called television’s first political star. This research examines contemporaneous press accounts, particularly those from Kefauver’s adopted hometown of Chattanooga, Tenn., to determine the extent to which such a storyline was immediately apparent. Microfilm and electronic database resources, supplemented by book and peer-reviewed journal content, form a contextual framework through which is argued the position that the Chattanooga dailies were in fact attuned to the changes being wrought by Kefauver’s probe. Ultimately, The Chattanooga Times …

Detecting Tropical Cyclone Signals In Tree Rings Of Longleaf Pine (Pinus Palustris Mill.), Valdosta, Georgia, U.S.A., Savannah Anne Collins

Masters Theses

The study of past hurricanes to help interpret the patterns of current and future tropical storms is vital to our economy, society, and infrastructure. Understanding how hurricanes are influenced by a warm climate is critical, and hurricane reconstructions from former periods of the Holocene (the last ~11,500 yr) will be beneficial. Paleotempestology is the study of past tropical cyclones and uses historical, biological, and geological proxies to reconstruct tropical cyclone activity to create a record of historical hurricane patterns. A tropical cyclone (TC) is a chaotic weather event that is influenced by several elements, including warm ocean waters from which …

An Assessment Of Broiler Litter Bacterial Diversity Using Next Generation Dna Sequencing, Jack Liu Davitt

Masters Theses

Broiler chicken farms produce large amounts of litter, comprised mainly of used bedding and bird fecal waste, which is land applied. The regional concentration of broiler farms and land application of litter in the United States is a water quality concern. Geographically concentrated production also increases biosecurity concerns with potential pathogens and high nutrient contents as the litter is moved and land applied. Previous studies have attempted to characterize the bacterial population within litter because of these concerns. To date, this effort has not provided comprehensive information on the bacterial community structure within broiler litter. This lack of knowledge hinders …

Localization Of Chemoreceptors In Azospirillum Brasilense., Anastasia Aksenova

Masters Theses

In order to ensure their survival, bacteria must sense and adapt to a variety of environmental signals. Motile bacteria are able to orient their movement in a chemical gradient by chemotaxis. During chemotaxis, environmental signals are detected by chemotaxis receptors and are propagated via a signal transduction cascade to affect bacterial motility. In a model organism Escherichia coli, chemotaxis receptors, also called MCPs (for methyl-accepting chemotaxis proteins) sense changes in concentration gradients by making temporal comparisons about the chemical composition of their surroundings. Decreased attractant concentration or increased repellant concentration results in conformational changes in the MCPs that culminate …

Plant Functional Traits Mediate Above- And Belowground Species Interactions In Ecological Communities, Courtney E. Gorman

Masters Theses

Functional plant traits provide a means whereby species identity can influence above- and belowground community interactions. To examine the role of plant functional traits in shaping ecological communities, Chapter 1 examines how the evolution of functional differences between closely related groups of endemic and non-endemic species influence associated species interactions, and Chapter 2 examines how plant functional traits can influence associated community composition.

A New Approach To Optimization Of Dynamic Reactive Power Sources Addressing Fidvr Issues, Weihong Huang

Masters Theses

Dynamic reactive power (var) sources, e.g. SVCs and STATCOMs, can effectively mitigate fault-induced delayed voltage recovery (FIDVR) issues or even voltage collapse. However, their optimal allocation in a power grid is a complicated nonlinear optimization problem since the post-fault voltage trajectories have to be solved to check constraints on voltage responses. Thus, solvers of both nonlinear optimization and power system differential and algebraic equations (DAEs) are required.

Currently, most of existing methods merely achieve dynamic optimization locally with great dependence on the initial operation point. Also, complicated algorithm and time consuming are obstacles for the practical implementation.

This thesis proposes …

Differentiation Of Equine Mesenchymal Stromal Cells Into Cells Of Neural Lineage And Their Application Into A Novel Model For Acute Peripheral Nerve Injury In The Horse, Claudia Cruz

Masters Theses

Studies have shown that mesenchymal stromal cells (MSCs) are able to differentiate into extra-mesodermal lineages, including neurons. Positive outcomes were obtained after transplantation of neurally-induced MSCs in rats, rabbits and guinea pigs after nerve injury, but the effect of these cells is unknown in horses. Our objective was to test the ability of equine mesenchymal stromal cells to differentiate into cells of neuronal lineage, and to assess differences, if any, in morphology and protein expression. Additionally, we wanted to investigate if horse age and cell passage number contributed to the ability to achieve neural differentiation.

The first part of this …

Drd2 And Xkr4: A Genetic Approach To Fescue Toxicosis., Kristine Marie Ely

Masters Theses

Tall fescue (Lolium arundinaceum Schreb) is the most prevalent forage in the Mid-south United States due to its observed hearty nature and ability to withstand heavy grazing. This is due to a symbiotic relationship with an endophytic fungus (Neotyphodium coenophialum). This fungus produces ergot alkaloids, which can bind to many adrenergic, serotonergic, and dopaminergic receptors. One of the primary functions of dopamine is to inhibit prolactin response. Decreased growth, reproduction, lactation, and depressed serum prolactin concentrations are commonly observed in beef cattle grazing endophyte-infected tall fescue. These symptoms are collectively referred to as fescue toxicosis, and …

Evaluation Of The Over-Expression Of A Miscanthus X Giganteus Ppdk (C4ppdk1) In Switchgrass (Panicum Virgatum) For Improved Cold Temperature C4 Photosynthesis, Mathew Christian Halter

Masters Theses

Switchgrass (Panicum virgatum) has been proposed as a potential biofuel feedstock to aid in the displacement of petroleum-based combustible fuels over the course of the next several decades. Improving the yield potential of this perennial grass is therefore of economic interest. Increased net ethanol yields can be achieved in cellulosic feedstocks via two means: 1. Improved sugar release from digestible cell wall materials, 2. Increased overall biomass yield. The latter is the subject of this study.

As a C4 photosynthetic plant, switchgrass is highly productive in the hot, humid climate of the southeastern United States. By bypassing the …

A Sensor For Oxygen In A Potassium-Sodium Alloy, Michael George Pastis

Masters Theses

This project supports a research project to determine the configuration for heat exchanger welds in a space reactor. The reactor is a sodium-potassium (NaK) cooled reactor for use on future missions on the lunar surface or on Mars. Various types of welds in Type 316L stainless steel have been positioned in a furnace which is part of a NaK test loop. The specimens are bathed in circulating NaK at 600 degrees centigrade.

Since the oxygen concentration in the NaK is a major factor in corrosion of the weld specimens, it must be carefully monitored and controlled. However, few techniques are …

Managing The Brand: Administrative Structure Of The Hidden Profession Of Collegiate Trademark Licensing, Katrina M. Phelps

Masters Theses

This study analyzes the current state of collegiate trademark licensing departments through first-hand accounts from current or past licensing professionals. Semi-structured interviews were conducted to understand current issues that are facing the licensing industry, particularly focusing on internal organizational structure of collegiate trademark licensing departments at institutes of higher education. Eleven participants, including licensing agents, licensees, licensing directors, and licensing experts were interviewed and the following themes emerged. Trademark licensing is a hidden profession, with little education available about the industry. Programs have greatly evolved over recent decades, but institutional infrastructure still lags in the appropriate assets and resources to …

Attention, Hyperactivity, And Cognitive Performance In Adults With Attention-Deficit/Hyperactivity Disorder (Adhd), Brianna Elizabeth Pollock

Masters Theses

The extent to which Attention-Deficit/Hyperactivity Disorder (ADHD) symptoms (i.e., inattention, hyperactivity/impulsivity) are associated with ADHD-related cognitive impairments has yet to be understood. This study sought to examine between-group differences in activity level, performance on a sustained attention task and objectively measured attention, while controlling for anxiety and depression severity in a sample of adults with and without ADHD (N = 26). High precision actigraphs and behavioral codes of visual attention to task were used to examine the extent to which activity level and visual attention to task are related to performance on a sustained attention task (i.e., Continuous Performance …

An Autonomous Online I-V Tracer For Pv Monitoring Applications, Cameron William Riley

Masters Theses

With the unprecedented growth of photovoltaic technologies and their implementation in recent times, more precise methods of determining modules health, degradation, and performance are needed. Current monitoring efforts are helpful in determining these attributes but do not provide all of the information necessary to truly understand the health properties of the PV module in question. The current-voltage curve, or I-V curve, provides a level of insight into a PV module’s health unparalleled by most monitoring efforts. However, the tools which measure the I-V curve exist in an undesirable form—PV must be disconnected from its load and connected to the tool …

A Low-Power Approach For Front End Biological Signal Conditioning, Logan Smith Taylor

Masters Theses

In a lab-on-a-chip (LOC) application, the measurement of small analog signals such as local temperature variation often involves detection of very low-level signals in a noisy micro-scale environment. This is true for other biomedical monitoring systems as well. These systems observe various physiological parameters or electrochemical reactions that need to be tracked electrically. For temperature measurement pyroelectric transducers represent an efficient solution in terms of speed, sensitivity, and scale of integration, especially when prompt and accurate temperature monitoring is desired.

The ability to perform laboratory operations on a small scale using miniaturized LOC devices is a promising biosensing technique. The …

Metamorphic Evolution Of Eastern Blue Ridge Calc-Silicates In Southwestern North Carolina, Northeastern Georgia, And Northwestern South Carolina, Gina Brianne Smith

Masters Theses

Calc-silicate rocks in the eastern Blue Ridge of SW North Carolina, NE Georgia, and NW South Carolina are products of contact and regional metamorphism. Two types of calc-silicates occur in this area: Type A rocks occur as contact metamorphosed xenoliths in the ~336 Ma Rabun Granodiorite batholith, and Type B rocks occur as mappable thin, elongate, ribbon-like units in the Tallulah Falls Formation east of the Rabun batholith. Petrographic and geochemical data confirm similar composition for both types and mineral assemblages that includes amphibole, garnet, epidote, diopside, quartz, and plagioclase with accessory zircon, sphene, and opaque minerals. Calcite, however, is …

Reviving First Person Understanding In Ethical Inquiry, Matthew Allen Reese

Masters Theses

Virtue Ethicists who follow the arguments set out in Elizabeth Anscombe’s Modern Moral Philosophy have consistently referenced problems with modern ethical thought. It is unclear, however, whether a single theme unites their dissatisfaction. Discovering ‘the problem’ is important for two reasons: first, it is, itself, historically interesting were there to emerge a common thread running through modernity; second, it is potentially insightful for providing future direction to ethicists. In the following two sections I argue, respectively, that such a theme underlies modern ethics and, further, that it is problematic.

In Section I, I take up three influential dichotomies. I situate …

Integrating Social Media In The Development Of A Special Event Population Dynamics Model, Kelly Michelle Sims

Masters Theses

With society’s increasing participation in social media, scientists now have access to new sources of data that reflect our daily activities in space and in time. Such data are plentiful and, more notably, at an unprecedented granular level. The ability for users to capture and express their geolocation through their phones’ global positioning system (GPS) or through a particular location’s hashtag or Facebook Page provides a great opportunity for modeling spatiotemporal population dynamics. High resolution population models and databases for episodic special events can be extremely useful for enhancing emergency management and response. This research assesses the feasibility of improving …

Investigating Instabilities With Hec-Ras Unsteady Flow Modeling For Regulated Rivers At Low Flow Stages, Jennifer Kay Sharkey

Masters Theses

Dams are used throughout the United States for generation of electricity and flood control. The Tennessee River Valley’s regulated river system extends through Tennessee and parts of Kentucky, Mississippi, Alabama, Georgia, North Carolina, South Carolina, and Virginia. Of the dams in this area, 49 are managed by the Tennessee Valley Authority (TVA). The TVA forecasts and monitors the activities related to these dams and others in the area on an around-the-clock basis to ensure maximum generation potential is attained and to prevent flooding of the surrounding cities. To best forecast hydrology for the regulated river system, the TVA chose to …

Consumer Perceptions Of A Brand's Social Media Marketing, Taylor Michelle Smith

Masters Theses

This project seeks to inform corporate marketing efforts, as well as add to the growing body of literature on social media marketing. The purpose of this project is to assess consumer perceptions of a brand’s social media marketing. Participants were obtained from the PetSafe® brand Facebook fan page, and a total of 195 respondents completed all measures and were included in the study. The results show that brands must be actively engaging their consumers via social media in order to compete in a competitive marketplace. Engagement can be promoted through entertaining and interactive posts, useful and relevant content, word of …

Adult Attachment, Emotional Intelligence, And Resilience As Correlates Of Social Engagement, Academic Engagement, And Confidence Of Persistence In College Students, Yacob Tewolde Tekie

Masters Theses

The current study investigated freshmen university students (N = 210) to examine the role of attachment style (anxiety, avoidance), emotional intelligence (repair, attention, clarity) and resilience in predicting student adaptation to college (academic, social, personal and academic engagement). Four multiple regression analyses were conducted for each subscale of adaptation to college. The results indicated that; a) emotional intelligence (attention, clarity) and resilience significantly predicted student academic adjustment; b) emotional inelligence (repair) predicted student social adjustment; c) emotional inteligence (clarity), resilience, and adult attachment (anxiety) significantly predicted student personal adjustment; and d) emotional intelligence (repair, clarity) and resilience, significantly predicted …

Performance Of Beef Cattle Grazing Native Warm-Season Grasses In An Integrated Forage/Biofuels System In The Mid-South, William Matthew Backus

Masters Theses

Early season (ES) and full season (FS) grazing strategies were used to evaluate performance of stocker steers grazing native warm-season grasses (NWSG) in 2010, 2011 and 2012 in two experiments. Experiment one was conducted at the Research and Education Center (REC) at Ames Plantation near Grand Junction and experiment two was conducted at Highland Rim REC near Springfield in which Angus and Angus cross steers (268±25kg) were used in completely randomized design with three forage treatments: 1) switchgrass (Panicum virgatum L.); 2) a combination of big bluestem (Andropogon gerardii Vitman) and indiangrass (Sorghastrum nutans); and 3) …

International Student Migration For Development: An Institutional Approach To The Norwegian Quota Scheme, Scott Eric Basford

Masters Theses

This paper addresses a call to acknowledge the varied actors that are involved in international student migration (ISM). In particular, this paper takes an institutional approach to investigate international education as a form of development aid. Research on ISM often omits non-student actors, which contributes to an incomplete understanding of the process. I study the Norwegian Quota Scheme to explore broader mechanisms of ISM. I first situate the Quota Scheme within literature on the internationalization of higher education and international education as development aid. I then use 26 interviews with 31 stakeholders at multiple scales of involvement in the Quota …

On The Development Of Conductive Textile Antennas, Dounia Baiya

Masters Theses

UWB systems are becoming increasingly utilized due to their use in a variety of applications. Meanwhile, many advances have been achieved in the realm of conductive textiles. These textiles can be used as a sensing system or implemented wearable antennas. Combining these two applications is attractive for a number of reasons. First, wearable antennas constructed entirely from fabric offer a cost- effective, flexible solution when compared to rigid antennas. Second UWB technology is also attractive for body area network applications due to the low power operation and the inherent low radiated power in its system design.

In our implementation accurately …

Effect Of Urbanization On Base Flow Hydrology Among Ecoregion Ii Catchments In Eastern United States, Barry Nolan Blanton

Masters Theses

Urbanization is a common parameter discussed among hydrologists and its effect on base flow hydrology and the 7Q10 [seven Q ten] statistic varies wildly. Population growth and urban development has grown at an alarming rate in recent years; especially in the Southern and Mid-Atlantic United States. This is due to the fact that 50% of the world’s inhabitants live in cities and over 500 cities house more than 1 million people. Development as it sprawls from urban centers is thought to have negative effects on groundwater recharge and the 7Q10. There are still questions as to how urbanization effects stream …

Glyphosate Resistant Palmer Amaranth (Amaranthus Palmeri) Management Late-Season And Post-Harvest In Corn Production Systems, Whitney D. Crow

Masters Theses

The objectives of this research were to evaluate control options for glyphosate resistant (GR) Palmer amaranth (Amaranthus palmeri) latelate-season in corn systems and POST-harvest for the prevention of seed production. Our results determined that the best late-season control methods were treatments tank-mixed with dicamba plus diflufenzopyr. These tank-mixtures improved control from 10 to 46% [percent] over treatments without the dicamba premix. Tankmixtures with dicamba plus diflufenzopyr that provided weed control > [greater than] 96% 28 DAA included s-metolachlor plus glyphosate plus mesotrione and tembotrione plus thiencarbazone.

For the prevention of POST-harvest GR palmer amaranth seed production, our results …

Laser-Induced Breakdown Spectroscopy For Analysis Of High Density Methane-Oxygen Mixtures, Matthew Dackman

Masters Theses

The applicability of laser-induced breakdown spectroscopy (LIBS) toward greater than atmospheric density combustion diagnostics is examined. Specifically, this involves ascertaining the feasibility of measuring chemical equivalence ratios directly from atomic emission spectra at high density. The need for such measurement arises from the desire to quantify real time, localized combustion performance in weakly mixed flows. Insufficiently mixed flows generally result in unwanted byproducts, possess the propensity for overall combustion instability, and are increasingly likely to experience localized flame extinction.

We simulate methane/oxygen combustion in ambient pressures ranging 1 to 4 atmospheres, demonstrating these results to be analogous to what would …

The Impact Of Acute Bouts Of Two Types Of Physical Activity On Cognition In Elementary School-Aged Children, Aslynn Courtney Halvorson

Masters Theses

Purpose: To determine the effect of acute bouts of two types of physical activity on cognition in elementary school-aged children. Methods: Subjects were 21 6-11 year old children (8.8 ± 1.6 years) who were free of any cognitive or learning disabilities or delays. Children participated in three randomly ordered conditions. The control condition included watching 20 minutes of TV while seated, the cycle condition included 20 minutes of cycling on a pediatric cycle ergometer at 60% of estimated heart rate maximum, and the play condition include 20 minutes of semistructured free play activity. After each condition, the children completed 2 …

Mind, Body And Soul: Performance Landscapes For A Healthy Community, Angelike G. Angelopoulos

Masters Theses

According to the World Health Organization, there have been increases in the adverse physical, mental and social conditions amongst urban populations in recent years. These issues have been attributed to impediments to healthy lifestyles, a lack of physical activity and poor food choices (WHO 29). This can lead to obesity, increasing risk of diabetes, heart disease and other health related problems. Sedentary lifestyles are worsened by modern technologies such as cell phones, computers, and video games.

Urban landscapes have evolved over time to suit the needs of various, and sometimes-competing priorities of growing cities. As a result, the health of …