Digital Commons Network^™

Investigating Mineral Stability Under Venus Conditions: A Focus On The Venus Radar Anomalies, Erika Kohler

Graduate Theses and Dissertations

Radar studies of the surface of Venus have identified regions with high radar reflectivity concentrated in the Venusian highlands: between 2.5 and 4.75 km above a planetary radius of 6051 km, though it varies with latitude. Previous research has proposed several theories on the source of these anomalies, including increased surface roughness, metallic materials with higher dielectric constants, or ferroelectric materials. Prior work suggests several processes that could be the origin of these anomalies, such as surface-atmospheric interactions or low lying clouds or fog. Alternatively, these anomalies could result from a semi-metallic compound trapped at the cooler conditions in the …

The Effect Of Protein Quantity And Quality At Breakfast On Energy Metabolism, Appetite And Metabolic Health, Brianna Lynne Neumann

Graduate Theses and Dissertations

Obesity is a global health concern and, within the United States, the current obesity rate is 36% and projected to double within the next two decades. Obesity is linked to many chronic diseases such as cancer, heart disease and type 2 diabetes. In young females, weight gain (5-11 kg) between the ages of 20-30 years increases the risk of developing type 2 diabetes and cardiovascular disorders later in life. The cause of obesity is multifactorial in nature, however fundamentally weight gain occurs when energy intake is greater than energy expended (i.e. calories in > calories out). Therefore, identifying and validating nutritional …

Telling New Tales: Modernizations Of Chaucer In The Eighteenth Century, Eric Duane Larson

Graduate Theses and Dissertations

Any review of medieval culture and literature in the British eighteenth century requires some consideration for the modernizations of Chaucer’s Canterbury Tales. Effectively a collaboration that spanned the entire century, this project began with Dryden and Pope and continued in earnest with lesser-known poets like George Ogle and William Lipscomb. The resulting modernization of every Chaucerian tale between 1700 and 1795 revisits medieval themes, but it also displays contemporary anxieties through presentations of language, content, style, and rhetorical intent that are sometimes vastly different from Chaucer’s originals.

The modernization project is worthy of study, in particular because it reflects, across …

Integrative Taxonomy Of North American Torrent Mites (Parasitengona: Torrenticolidae: Torrenticola), Jon Ray Fisher

Graduate Theses and Dissertations

Mites are notorious for being under-studied and incomplete knowledge of distribution, life-history, and morphology are commonplace. They typically gain attention through the relatively few pest species that plague our crops, pets, or bodies. Despite representing a successful radiation with an estimated 3–5 million species, relatively few mite lineages attract research attention from non-acarologists. However, the largest radiation of all mites—Parasitengona—has potential to bridge the gap between specialists and non-specialists. Parasitengona are the butterflies of the mite world. Obvious are the bright red mites searching for pollen on concrete, or the large, furry velvet mites coming out to mate after spring …

A Preliminary Investigation Of Positive Imagery Training To Reduce Risk For Suicidal Behavior Among Adolescent Girls, Sasha Micaella Rojas

Graduate Theses and Dissertations

Suicide is the second leading cause of death among adolescents, with risk for suicidal thoughts and suicidal behavior emerging during adolescence particularly among girls. Consistent with theory and empirical evidence, the current study examined the effects of Socially-focused positive imagery training among a small sample of adolescent girls evidencing suicidal thoughts. This preliminary small n design also allowed for a detailed assessment of acceptability of imagery training for the adolescent sample. Risk for suicidal intent was indexed by 1) negative affect, 2) positive affect, 3) greater resting right (relative to left) prefrontal asymmetry, 4) perceived Social isolation, and 5) suicidal …

Autophagy Regulation After Diet And Exercise In Non-Alcoholic Fatty Liver Disease, Megan Elizabeth Rosa

Graduate Theses and Dissertations

Along with the rise in obesity, rates of non-alcoholic fatty liver disease (NAFLD) have also increased. NAFLD may begin with fat accumulation in the liver, but can progress to non-alcoholic steatohepatitis (NASH), fibrosis, and eventual cirrhosis. With no pharmacological treatment for NASH, lifestyle interventions appear vital to maintaining liver health. Previous work has shown aberrant mitochondrial content/quality and autophagy in models of NAFLD. Exercise is known to improve mitochondrial health and possibly autophagy, thus autophagy may be a key regulatory factor for treatment of obesity induced-NAFLD. PURPOSE: The purpose of the study was to examine how weight loss from diet …

The Role Of Child Anxiety In Parent Sick Role Reinforcement, Sarah Ann Bilsky

Graduate Theses and Dissertations

A large body of evidence suggests that parents can facilitate offspring anxiety in response to bodily arousal. These learning experiences are referred to as “sick role reinforcement,” and are particularly important during adolescence, given the profound bodily changes (e.g., puberty) that characterize this period. Sick role reinforcement is likely important in the context of panic disorder (PD). Panic theorists suggest that parents may enhance panic vulnerability by increasing the threat value of bodily sensations. Although a sizeable body of work has examined the role of parent behavior in these processes, few have examined offspring factors in this process. Additionally, little …

Creating Caring Qualified Early Childhood Teachers: An Exploration Of The Relationship Between Teacher Efficacy And Learner-Centeredness Among Early Childhood Professionals In Arkansas, Mary Line

Graduate Theses and Dissertations

The demand for degreed teachers for positions teaching children even younger than preschool age is increasing across the United States. Teacher qualifications vary from state to state, and there is increased emphasis on teacher credentials and education. The current study extends the current literature by examining variables that effect the development of teacher efficacy and aims to determine a relationship between trainability of characteristics of beliefs about learner-centered beliefs/developmentally appropriate practices and teacher efficacy. Participants were 175 teachers working in the state of Arkansas in early childhood programs teaching children birth to 5 years of age. A significant relationship was …

Cooling Effectiveness Of Modified Cold-Water Immersion Method Following Exercise-Induced Hyperthermia, Katherine Elizabeth Luhring

Graduate Theses and Dissertations

Context: Recommended treatment of exertional heat stroke (EHS) includes whole body cold-water immersion (CWI); however, remote locations, spatial or monetary restrictions challenge CWI feasibility. Thus, the development of a modified, portable CWI method would allow for optimal treatment of EHS when restrictions apply. Objective: Determine cooling efficacy of modified CWI (tarp assisted cooling with oscillation; TACO) following exertional hyperthermia. Design: Randomized, crossover controlled trial. Setting: Environmental chamber (33.4 ± 0.8°C, 55.7 ± 1.9% relative humidity). Patients or Other Participants: Sixteen (9 males, 7 females) volunteers (26 ± 4.7y, 1.76 ± 0.09m, 72.5 ± 9.0kg, 20.7 ± 7.1%body fat) with no …

High Step-Up/Down Transformerless Multilevel Converter For Renewable Energy Applications, Haider Ghazi Mhiesan

Graduate Theses and Dissertations

This thesis focuses on a high step-up/down transformerless dc-dc modular multilevel converter (MMC) that would be applicable to dc power systems. The design achieves high voltage ratios for interfacing renewable energy sources such as photovoltaic and line interactive Uninterruptible Power System (UPS) systems. The circuit topology provides for high step-up/down dc-dc conversion ratios using an MMC approach operating in resonant mode in order to improve overall efficiency. This topology operates to step-up the input voltage with 1:10 or larger conversion ratio. As a bidirectional converter, it also provides step-down capability at the same voltage ratio (10:1 or greater). The MMC …

Comparative Efficacy Of Foaming And Non-Foaming Handsoap In Reduction Of Microorganisms In Handwashing, Danielle Marie Conover

Graduate Theses and Dissertations

Handwashing (HW) is a long established method to prevent disease transmission. Ensuring effectiveness of current HW methods is essential for optimal HW and enhanced disease prevention. The objectives of this research were to 1) conduct a survey of soap type and volume in food service establishments in Washington County, Arkansas; 2) investigate how soap type impacts HW behavior; and 3) determine the difference in microbial reduction between foaming (F) and liquid (L) handsoap. For Objective 1, food service establishments in Washington County, AR were selected based on exclusion criteria and random number generations, and handsoap samples were collected to determine …

The Effect Of Fluid Balance On Exercise Performance In The Heat, Yasuki Sekiguchi

Graduate Theses and Dissertations

Introduction: In dehydrated individuals thirst seems to disappear after ingestion of small amount of water before full rehydration. This phenomenon has been linked to oropharyngeal receptors. However, some researchers suggest that drinking to satisfy thirst is enough for optimal performance. It is well established that water deficit greater than 2% of body weight decreases exercise performance in the heat. No study has ever examined the effect hydration on exercise performance in the absence of thirst via oropharyngeal stimulation. Purpose: The purpose of this study is to examine the effect of dehydration on exercise performance and thermoregulation during exercise in the …

An Analysis Of The Sovereign Citizen Movement: Demographics And Trial Behaviors, Stephen Garrett Smith

Graduate Theses and Dissertations

To date little to no empirical research has been conducted on the Sovereign Citizen Movement (SCM) and how it fits into the broader far-right domestic terrorist movement. The main focus of this study is to determine if there is a significant difference between the SCM and the far-right in their demographic composition, trial strategies, and trial behaviors and whether the SCM should be grouped together with the broader far-right during analysis. Using the American Terrorism Study (ATS), I coded 97 federal court cases involving sovereign citizen defendants (N=150) and ran basic frequencies on demographic and trial behavior variables on the …

Course Delivery Methods And Perceptions Of Self-Efficacy Of Pre-Service Teachers, Susan K. Anselm

Graduate Theses and Dissertations

Conflicting research results regarding outcomes for distance versus face-to-face course delivery methods, as well as a lack of that research, presents a need for further research into distance education. This mixed methods study adds to the existing literature on distance education, and will provide specific research exploring pre-service teachers’ perceptions of their self efficacy in the context of teacher education. This study is descriptive in nature, and has a dual purpose: to add to the existing knowledge base regarding distance education models and traditional face-to-face delivery models in teacher education, and to inform program designers about the impact of these …

Walking In American History: How Long Distance Foot Travel Shaped Views Of Nature And Society In Early Modern America, Brian Christopher Hurley

Graduate Theses and Dissertations

The industrialization of transportation, first with railroads, and then with automobiles, took Americans away from foot transport, changing how Americans interacted with one another and viewed their surroundings. The dissertation traces the walking trips of five central figures in this era of mechanized transport, the personal impact of their experiences while walking through a land they were accustomed to skimming across, and the ways in which these personal revelations led to changes in the national consciousness. Walking upright was central to the development of homo sapiens as a species, and shaped the way they interacted with their environment. Certain aspects …

The Mass Flux Of Non-Renewable Energy For Humanity, Edwin Dale Solomon

Graduate Theses and Dissertations

The global energy supply relies on non-renewable energy sources, coal, crude oil, and natural gas, along with nuclear power from uranium and these finite resources are located within the upper few kilometers of the Earth’s crust. The total quantity of non-renewable energy resources consumed relative to the total quantity available is an essential question facing humanity. Analyses of energy consumption was conducted for the period 1800 – 2014 using data from the U. S. Energy Information Administration (EIA) and World Energy Production, 1800-1985 to determine the balance between non-renewable energy resources consumed and ultimately recoverable reserves. Annual energy consumption was …

Cultural Values And Risk And Benefit Perceptions: An Examination Of The Mediating Roles Of Trust And Knowledge Hubris, Clayton Creed Tumlison

Graduate Theses and Dissertations

This thesis examines the process by which cultural value predispositions influence perceptions of risks and benefits of energy policies, specifically focusing on High Voltage Power Line (HVPL) installations and Hydraulic Fracturing (fracking). For HVPL installations I examine the role of (dis)trust in three groups associated with the HVPL debate – the government, environmental groups, and the energy industry – in determining risk and benefit perceptions of HVPL installation. Findings indicate that cultural value predispositions guide policy elites’ perceptions of trustworthiness. Further, this trust, in turn, guides perceptions of risks and benefits of HVPL installations, partially mediating the effects of cultural …

The Principle Of Dong Zhongshu's Omen Discourse And Wang Chong's Criticism Of Heaven's Reprimand In The Chapter “Qian Gao”, Xun Yang

Graduate Theses and Dissertations

Omen discourse, the investigation of aberrant natural disasters and miraculous celestial phenomena, provided a sophisticated ideological model that could be exploited to expostulate with the sovereign for his transgressions, and to denounce the misgovernment of the imperial bureaucracy. The first of this political model is the personification of the supreme Heaven and the elevation of Heaven’s status. From the perspective of ru 儒 (Confucians) scholars, the establishment of Heaven’s supreme authority upon the human realm and the restriction of the sovereign in power guarantee the rectification of political mistakes as well as an applicable way for ru scholars to actively …

Measuring Teacher Effectiveness: A Comparison Across Va Models Utilizing Arkansas Data, Kelli Lane Blackford

Graduate Theses and Dissertations

A shift in accountability systems from No Child Left Behind to a reauthorization of the Elementary and Secondary Education Act redefined the mandate of classroom teachers from being highly qualified to highly effective. Whereas previously, a teacher was deemed highly qualified for having a bachelor’s degree, full state certification, and demonstrated knowledge of subject matter in the field they teach, a highly effective teacher had to demonstrate their abilities to move a student at an acceptable rate of student growth (one grade level in an academic year). To provide this evidence, student assessment data was now going to be a …

Isotopic Identification Of Multiple Contributors Of Metal Ions In Mississippi Valley-Type Ore Deposits Along The Cincinnati Arch In South-Central Kentucky, William Travis Garmon

Graduate Theses and Dissertations

Mississippi Valley-Type (MVT) ores are economically-viable deposits of sulfide minerals, often dominated by sphalerite (zinc-sulfide) in carbonate facies, and galena (lead-sulfide) in siliciclastic facies. MVT ores precipitate from migrating fluids, which carry base metals often complexed with chlorine ions within a basinal brine. This study identifies metal-contributing source-regions of the Burkesville MVT deposit using Pb-isotope ratios within sphalerite samples collected from the Burkesville deposit. The deposit is found in south-central Kentucky within the Middle-Tennessee ore district along the crest of the Cincinnati Arch, which is the anticlinal divide between the Appalachian Basin and the Illinois Basin. Competing theories argue that …

Enabling Usage Pattern-Based Logical Status Inference For Mobile Phones, Jon C. Hammer

Graduate Theses and Dissertations

Logical statuses of mobile users, such as isBusy and isAlone, are the key enabler for a plethora of context-aware mobile applications. While on-board hardware sensors (such as motion, proximity, and location sensors) have been extensively studied for logical status inference, continuous usage typically requires formidable energy consumption, which degrades the user experience. In this thesis, we argue that smartphone usage statistics can be used for logical status inference with negligible energy cost. To validate this argument, we present a continuous inference engine that (1) intercepts multiple operating system events, in particular foreground app, notifications, screen states, and connected networks; (2) …

Validation Of A Confocal Light Sheet Microscope Using Push Broom Translation For Biomedical Applications, Joshua Hutcheson

Graduate Theses and Dissertations

There exists a need for research of optical methods capable of image cytometry suitable for point-of-care technology. To propose am optical approach with no moving parts for simplification of mechanical components for the further development of the technology to the poin-of-care, a linear sensor with push broom translation method. Push broom translation is a method of moving objects by the sensor for an extended field of view. A polydimethylsiloxane (PDMS) microfluidic chamber with a syringe pump was used to deliver objects by the sensor. The volumetric rate of the pump was correlated to the integration time of the sensor to …

How The University Of Arkansas’ Change In Conference Affiliation Set Off Realignment In Intercollegiate Athletics, Matthew Jones

Graduate Theses and Dissertations

The era of realignment within the conferences that make up the largest football-playing division of the National Collegiate Athletic Association can be traced to one event.

In the 1984 Supreme Court case NCAA v. Board of Regents, the court ruled the NCAA had violated antitrust laws by not allowing individual colleges to negotiate their own TV contracts for football games. The decision nulled and voided existing TV contracts with the NCAA, allowing a free market for colleges. Many programs partnered with the College Football Association to negotiate TV contracts in the 1980s and early ‘90s.

Five years after the Supreme …

Effect Of Passive Heating On Males And Females With Elevated Arterial Stiffness, Forrest Blake Robinson

Graduate Theses and Dissertations

Context: Cardiovascular disease (CVD) is one of the leading causes of mortality in the United States, accounting for about 1 in every 4 deaths annually. Studies have shown that passive heating does have some degree of effect on arterial stiffness, but not much is known about populations with higher stiffness. Objective: To examine the independent effect of core temperature increase during passive heating on arterial stiffness. Methods: Participants visited the lab three times; one familiarization and two experimental trials. The experimental trials consisted of subjects being passively heated in an environment of 40°C / 40% relative humidity (HEAT) or normal …

The Effects Of Dynamic Graphing Utilities On Student Attitudes And Conceptual Understanding In College Algebra, Ryan Vail Thomas

Graduate Theses and Dissertations

The goal of this study is to explore and characterize the effects of using a dynamic graphing utility (DGU) on conceptual understanding and attitudes toward mathematics, measured by the responses of college algebra students to an attitude survey and concepts assessment. Two sections of college algebra taught by the primary researcher are included in the study, with one group using the dynamic graphing utility Desmos (www.desmos.com), and the other using the TI-84 (or equivalent) graphing calculator as a control. The Precalculus Concept Assessment (Carlson, Oehrtman, & Engelke, 2010) was used to measure aspects of students’ conceptual understanding of course material, …

Do Parole Revocations Contribute To Racial Disproportionality In Imprisonment? A Multilevel Analysis Of State Prison Admissions From 1990-2009, Caitlin Curry

Graduate Theses and Dissertations

Scholars have sought to understand the problem of racial disproportionality in U.S. imprisonment rates for over four decades, but current research has yet to identify the specific correctional mechanisms that exacerbate racial differences in incarceration (Garland, 2013). The rate of parole revocations increased markedly in the 1990s and 2000s, contributing to the growth in imprisonment in the US. Likewise, some research also finds that the likelihood of parole revocation varies by race, but we know little about the effect of parole revocations on imprisonment disparity (Huebner and Bynum, 2008). This study uses a sample of 24 states over a twenty …

Dietary Effects On The Stoichiometry Of Growth, Regulation, And Wastes Of Ozark Stream Insect Detritivores, Halvor Matthew Halvorson

Graduate Theses and Dissertations

A widespread stressor, anthropogenic nitrogen (N) and phosphorus (P) pollution can increase resource nutrient content and alter animal community composition in freshwater ecosystems. In this dissertation, I used ecological stoichiometry theory to examine effects of diet nutrient content and leaf litter type on growth, regulation, and wastes of aquatic invertebrate detritivores. I tested effects of leaf litter diet carbon:phosphorus (C:P) on growth and stoichiometric regulation of the detritivorous caddisfly Pycnopsyche lepida and used results to determine a threshold elemental ratio of oak litter C:P=1620 that confers peak growth of this species. This empirical, growth-based approach provided a more accurate estimate …

Correcting Current Imbalances In Three-Phase Four-Wire Distribution Systems, Vinson Joseph Jones

Graduate Theses and Dissertations

The objective of this thesis is to present the theory, design, construction, and testing of a proposed solution to unbalanced current loading on three-phase four-wire systems. The Unbalanced Current Static Compensator is the name of the prototype; herein referred to as the UCSC. The purpose of this prototype is to redistribute current between the three phases of a distribution system. Through this redistribution, negative- and zero-sequence currents are eliminated and a balanced system is seen upstream from the point of installation.

The UCSC consists of three separate single-phase H-bridge inverters that all share the same dc-link capacitor. Each of these …

Data Partitioning Methods To Process Queries On Encrypted Databases On The Cloud, Osama M. Omran

Graduate Theses and Dissertations

Many features and advantages have been brought to organizations and computer users by Cloud computing. It allows different service providers to distribute many applications and services in an economical way. Consequently, many users and companies have begun using cloud computing. However, the users and companies are concerned about their data when data are stored and managed in the Cloud or outsourcing servers. The private data of individual users and companies is stored and managed by the service providers on the Cloud, which offers services on the other side of the Internet in terms of its users, and consequently results in …

Production And Application Of Trans, Trans Cla-Rich Eggs: Chemical And Physiological Properties And Prospects For Value-Added Foods, Sara Shinn

Graduate Theses and Dissertations

Conjugated linoleic acid (CLA) is an 18-carbon fatty acid with conjugated double bonds that is naturally present in beef and dairy products. Certain CLA isomers exhibit human bioactivity such as anti-obesity and muscle metabolism effects, as well as prevention of age-associated conditions, and improved immune and inflammatory responses. However, an individual needs to consume 3-4 g CLA/day to realize these potential health benefits, and a Western diet only provides a tenth of this recommendation. Chicken eggs have been used as a commercialized vehicle to deliver other bioactive lipids such as omega-3 fatty acids, because the lipid profile of the egg …