Digital Commons Network^™

Modulation Of Valve Interstitial Cell Function Through Cell Shape And Phenotype, Atefeh Razavi

Graduate Theses and Dissertations

The aortic valve is a highly dynamic structure responding to actively to the chemical, mechanical and physical cues of the valve microenvironment. Valve interstitial cells are dispersed throughout the valve tissue and play an important role in maintaining the integrity and optimum function of the valve. They are a heterogeneous population composed of various phenotype. These phenotypes have specific functions characteristic of valve physiological and pathological conditions. The effect of mechanical loading and chemical modulators on the behavior of the valve interstitial cells have largely been studied. However the role of valve interstitial cell shape as an intrinsic physical cue …

Leptin Regulates The Expression Of Autophagy-Related Genes In Chickens, Peter Olawale Ishola

Graduate Theses and Dissertations

Autophagy or cellular self-digestion, a lysosomal degradation pathway that is conserved from yeast to human, plays a key role in recycling cellular constituents, including damaged organelles. It also plays a pivotal role in the adaptation of cells to a plethora of distinct stressors including starvation. Autophagy has been extensively studied in mammals and yeast, but little is known in avian species. Thus, the major objective of the present study was to determine the effects of leptin on autophagy-related genes in chicken hypothalamus, muscle and liver. Leptin is an adipocytokine that is mostly produced by white adipose cells in mammals (as …

Calorimetry And Body Composition Research In Broilers And Broiler Breeders, Justina Victoria Caldas Cueva

Graduate Theses and Dissertations

Indirect calorimetry to study heat production (HP) and dual energy X-ray absorptiometry (DEXA) for body composition (BC) are powerful techniques to study the dynamics of energy and protein utilization in poultry. The first two chapters present the BC (dry matter, lean, protein, and fat, bone mineral, calcium and phosphorus) of modern broilers from 1 – 60 d of age analyzed by chemical analysis and DEXA. DEXA has been validated for precision, standardized for position, and equations and validations developed for chickens under two different feeding levels. These equations are unique to the machine and software in use. Research in broilers …

Swat Model Simulation Of Bioenergy Crop Impacts On Water Quality In Cache River Watershed, Eeshan Kumar

Graduate Theses and Dissertations

Energy security through increased biofuel production is one of the components of the Energy Independence and Security Act (EISA) 2007. As per EISA 2007 mandate, appropriate independent research institutes are required to assess concerns to natural biodiversity due to biofuel production and report it to the Congress through the Environment Protection Agency (EPA). Planners, researchers, and agencies concerned with environmental regulations, ideally, would like to have location-specific information about the impacts for developing appropriate management interventions. This study examines long-term impacts on water quality in response to targeted (i.e. marginal lands) production of biofuel crops by setting up two SWAT …

The Structural Analysis Of Enola And Greenbrier, Arkansas Earthquake Swarms: Cause And Effect?, Minella Majenu

Graduate Theses and Dissertations

Almost 20 years after the remarkable earthquake swarm of 1982, near the town of Enola, Arkansas, with more than 40,000 micro-earthquakes, another event revisited the same North-Central Arkansas region in 2001. Nine years later, in 2010, a huge swarm event shook the northern part of Faulkner County, around the city of Guy. The following year, this seismic swarm event apparently migrated southward towards the city of Greenbrier, with an increase in the number of yearly recorded events. A 13km previously unrecognized, NE trending Guy-Greenbrier basement fault was revealed as a result of these swarm events.

Within the vicinity of the …

High Temperature Silicon Carbide Mixed-Signal Circuits For Integrated Control And Data Acquisition, Ashfaqur Rahman

Graduate Theses and Dissertations

Wide bandgap semiconductor materials such as gallium nitride (GaN) and silicon carbide have grown in popularity as a substrate for power devices for high temperature and high voltage applications over the last two decades. Recent research has been focused on the design of integrated circuits for protection and control in these wide bandgap materials. The ICs developed in SiC and GaN can not only complement the power devices in high voltage and high frequency applications, but can also be used for standalone high temperature control and data acquisition circuitry.

This dissertation work aims to explore the possibilities in high temperature …

Traction-Separation Relationships For Hydrogen-Induced Grain Boundary Embrittlement In Nickel Via Molecular Dynamics Simulations, Wesley Allen Barrows

Graduate Theses and Dissertations

The deleterious effects of atomic and molecular hydrogen on the mechanical properties of metals have long been observed. Although several theories exist describing the mechanisms by which hydrogen negatively influences the failure of materials, a consensus has yet to be reached regarding the exact mechanism or combination of mechanisms. Two mechanisms have gained support in explaining hydrogen’s degradative role in non-hydride forming metals: hydrogen-enhanced localized plasticity and hydrogen-enhanced decohesion. Yet, the interplay between these mechanisms and microstructure in metallic materials has not been explained. Accordingly, for this thesis, the three main objectives are: (i) to develop a numerical methodology to …

Investigations Of Ethylene And Ethylene Inhibition, Ball Lie, And Synthetic Turf Color, William Daniel Strunk

Graduate Theses and Dissertations

This dissertation is comprised of several studies over three unrelated areas of focus. Chapters two and three investigate the role of the hormone ethylene on growth of creeping bentgrass through (1) exposure of turf to exogenous ethylene and (2) testing an ethylene inhibiting compound for use to alleviate stress related injury. Previous research demonstrated a correlation of stress injury and ethylene and lessening of injury through ethylene inhibition, but little work has been conducted evaluating the direct effects of ethylene. These studies failed to confirm findings in previous research. Chapters four and five aim to illustrate the impact of turfgrass …

Swelling-Etching Characterization Of Copper (I) Oxide - Pdms For The Development Of Micro/Nano - Particles Composite Mems Corrosion Sensor, Abdoul Kader Maiga

Graduate Theses and Dissertations

The primary objective for this thesis is to contribute to the understanding of the oxide removal process for a corrosion sensing device. The goal for designing such a device is for monitoring corrosion on metallic structures. The sensing material (6.35mm x 1mm discs) of the device is composed of copper (I) oxide particles mixed in some polydimethylsiloxane (PDMS). The PDMS, “housing,” is meant for controlling the oxidation rate through the sensing material. A solvent was used to facilitate the etchant diffusion through the PDMS matrix. Toluene and acetic acid were the ideal solvent and etchant, respectively, for carrying out the …

A Random Assignment Evaluation Of A College And Career Coaching Program, Sarah Burks Moore

Graduate Theses and Dissertations

Razor C.O.A.C.H. (Creating Opportunities for Arkansan’s Career Hopes) is a college and career coaching program for at-risk students in 15 Northwest Arkansas high schools. To perform a random assignment evaluation, at-risk students were targeted to apply to the program, and applicant students were randomly assigned to the program. Academic coaches from the University of Arkansas College of Education and Health Professions utilized a needs-based intervention focusing on pro-academic behaviors, college or technical school preparation, and post-secondary and career exploration. The evaluation included two cohorts of students. Cohort One treatment students received the full intervention throughout the 2012-13 school year, and …

Poor Relations: An Original Play By Robert Flaherty Hart, Robert Flaherty Hart

Graduate Theses and Dissertations

The goal of this dissertation is to present my play, Poor Relations, to my thesis committee and discuss both the process of bringing it to the stage and the results of that process.

The dissertation opens with a narrative essay detailing the process of writing Poor Relations and bringing it to the stage in a full production. It discusses my initial idea for the play, the original draft and changes made after input from those at informal readings. It pays particular attention to the changes that were made during the rehearsal process for the full production.

Following is a copy …

The Educational Benefits Of Cultural Institutions, Brian Kisida

Graduate Theses and Dissertations

A significant portion of the education children receive occurs outside of the traditional classroom and produces outcomes not typically captured by standardized achievement tests. This dissertation is part of an effort to expand the educational venues and outcomes educational researchers rigorously examine. In particular, I present the key results from experimental studies of the effects of school tours to the Crystal Bridges Museum of American Art in Bentonville, AR., and to the Museum of Discovery in Little Rock, AR.

Chapter 1 focuses on arts exposure and critical thinking outcomes. A problem for the arts’ role in education has been a …

Preventive Maintenance Decision Modeling In Health And Service Systems, Mahboubeh Madadi

Graduate Theses and Dissertations

This dissertation focuses on the preventive maintenance decision modeling in healthcare and service systems. In the first part of this dissertation, some issues in preventive health decisions for breast cancer are addressed, and in the second part, the required characteristics for preventive maintenance of an unreliable queuing system are derived.

Adherence to cancer screening is the first issue that is addressed in this dissertation. Women’s adherence or compliance with mammography screening remained low in the recent years. In this dissertation, we first develop a design-based logistic regression model to quantify the probability of adherence to screening schedules based on women’s …

The Temporary Permanence Of Syrian Refugees In Jordan, Charles Edward Davidson

Graduate Theses and Dissertations

In the wake of the 2011 Syrian Civil War, hundreds of thousands of refugees fled to neighboring Jordan. The government of Jordan received them and along with NGOs from around the world, provided for some of their most basic needs including food, education and healthcare. In the summer of 2014 I travelled to Amman and Mafraq, Jordan in order to learn more about the work being done among the Syrians by non-governmental organizations (NGOs). What I found was a variety of short-term aid projects designed by the NGOs to meet the various needs of the refugees. I learned of no …

Understanding Technology Diffusion And Spatial Accessibility In The Home Healthcare Industry, Mehmet Serdar Kilinç

Graduate Theses and Dissertations

Home healthcare is becoming an important alternative to institutionalized care. It not only reduces costs but also increases health outcomes and patient satisfaction. However, the availability and efficiency of home healthcare services need to be improved as the aging population increases in the US. Hence, understanding home healthcare utilization and access are the essential steps to develop strategies ensuring effective and sustainable services to patients.

This research aims to study two main issues in the US home healthcare system: diffusion and long-term impacts of home telehealth and potential spatial accessibility of home healthcare services. Home telehealth is a promising technology …

Information Propagation In Financial Markets, Garrett A. Mcbrayer

Graduate Theses and Dissertations

This dissertation consists of three essays which examine information flows through financial markets and across firms, and investigates the factors affecting the process of information dissemination. The first essay examines whether the announcement of a credit rating change for a given firm contains information pertinent to the valuations of intra-industry peer firms. I identify an information spillover effect on peer firms surrounding credit rating downgrades. Further, I find that the post-announcement spillover effects are indicative of an overreaction in the market’s response to the downgrade announcement. Peer firms exhibit predictability in their post-announcement returns as a function of their relative …

A Search For Understanding Why Male, Long Term High School Dropouts Resist Returning To Complete A Secondary Credential, Robert S. Mcgowan

Graduate Theses and Dissertations

Much of the resistance for returning to education seems to be related to the same reasons students left school to begin with. The reason for dropping out and resisting to return to school may be a result of too much emphasis on academic preparation and too little emphasis on satisfying the perceived needs for preparing a youth for adulthood. Four themes emerged from the field-note based interviews: (1) all students do not learn the same way, (2) there is a need for more participatory learning, (3) learning should be relevant to life as perceived by the student, and (4) there …

The Effects Of Brand Familiarity On Perceived Risks, Attitudes, And Purchase Intentions Toward Intimate Apparel Brands: The Case Of Victoria’S Secret, Jennifer Lynn Rose

Graduate Theses and Dissertations

The purpose of this research was to examine the effects of brand familiarity on reducing consumers’ perceived risks in intimate apparel shopping, which in turn influence consumers’ attitudes and purchase intentions toward intimate apparel brands. To predict relationships among perceptions of risk and consumer behaviors, the present study adopted the perceived risk theory (Cox, 1976) and a modified version of the theory of reasoned action (TRA; Fishbein & Ajzen, 1975).

An online survey was conducted by recruiting adult females through a large Mid-Southern university in the U.S. Reliable and valid measures from previous research were adopted and modified to assess …

Effect Of Nitrogen Fertilizer Rates And Two-Spotted Spider Mite Incidence On 'Strawberry Festival' Strawberry Cultivar Performance, Megan E. Mcgovern

Graduate Theses and Dissertations

The decline in strawberry (Fragaria x ananassa Duch.) production in Arkansas over the last 50 years has sparked an interest in the use of season extension techniques to improve yield and fruit quality. High tunnel strawberry production has the potential to become a profitable and sustainable production system; however, information on nutrient and pest management is limited.

The overall objective of this study was to determine the response of ‘St. Festival’ strawberry cultivar to different nitrogen fertilizer rates in order to develop a fertilization program for strawberries grown under high tunnel production systems. Experiments were conducted at the University of …

Dramatizing Power And Resistance: Images Of Women In Pakistani And Indian Alternative Theater, Sobia Mubarak

Graduate Theses and Dissertations

This dissertation analyzes Pakistani and Indian plays that illustrate the nexus of power relations that operate in Pakistan and India to disempower women and the way women resist by creating dialogic spaces or fissures in the exploitative system. I have selected plays by Ajoka Theater in Pakistan and plays dealing with the similar thematic concerns by notable Indian playwrights to explore common grounds and points of departure. I have chosen four images of women depicting diverse modes of oppression associated with women’s bodies that are dealt with in these plays.

Chapter 1 examines Barri/The Acquittal by Ajoka theater, and Mother …

Architectures For A Future South: Posthumanism And Ruin In The Novels Of Cormac Mccarthy, Joshua Ryan Jackson

Graduate Theses and Dissertations

This thesis reads the novels of Cormac McCarthy as posthuman southern literature to explain why fiction from the South after World War II could no longer convey a sense of place during postmodernity: that is, because the region's culture and economy were transitioning from predominantly humanistic thinking (i.e., believing that humans [and especially southern humans] are supreme beings) to predominantly posthumanistic thinking (i.e., believing that humans are not as supreme as they think they are). It argues that we can trace this ideological change over time via structural shifts in the South’s architectural record, which we see in the ruins …

The Acclimation Processes For New, First-Time Presidents At Public, Master’S-Level Comprehensive Institutions: Lessons Learned, Mark Allan Kinders

Graduate Theses and Dissertations

The purpose of this study was to learn the acclimation practices of new, first-time presidents at regional, public comprehensive institutions. An original survey conducted from January through March, 2015, was completed by 61 new CEOs for a 59% response rate. They reported numerous activities that were helpful to learn their organization so as to become sufficiently comfortable in their understanding of campus culture, governance processes, operational practices, regional partners, and state policy climate to lead their organizations forward. With experience they learned that acclimation took longer than they expected. The study found higher rates of female or minority CEOs, and …

Effects Of Intervention On Self-Regulated Learning For Second Language Learners, Lu Yu

Graduate Theses and Dissertations

The purposes of the study were to investigate the process of self-regulated learning and the effects of an intervention program on self-regulated learning designed for second language (L2) learners. 120 participants who were sophomores majoring in English education at a university in an Asian country were randomly assigned to either the experimental group or control group. The self-regulated learning intervention was composed of six weekly two-hour training sessions that focus on five main variables of self-regulatory process: goal setting, self-efficacy, time and study environment management, language learning strategies, and attribution. The operation of self-regulated learning processes in the context of …

Basic Counseling Techniques Training: The Differential Effects Of Two Models On Skill Development And Fully Functioning, Christopher Loyd Carver

Graduate Theses and Dissertations

The purpose of this study is to examine the effects of two models of basic counseling skill training on the development of fully functioning, and the frequency of basic skill utilization as assessed at the end of the course. Two groups of students were taught using the Carkhuff Human Resource Development model (1971) and Egan’s Skilled Helper model (2002). They were then given the Strathclyde inventory to assess fully functioning early and at the end of the semester, and skill frequency count was conducted on all participants. Mann-Whitney-Wilcoxon tests were conducted to determine difference between groups in both measures. Additionally, …

Economic Literacy: Measuring The Economic Human Capital Of Arkansas K-12 Teachers, June Marie Freund

Graduate Theses and Dissertations

Economic literacy is recognized as a deficit quality in the United States, no more prevalent than during the last great recession. It is paramount the K-12 educational system lead the movement to educate the public on economic content and issues, as it is the one institution that has direct contact with all citizens. The question then must be asked, how economic literate are teachers entrusted with the responsibility of imparting economic knowledge to his/her K-12 grade level student. A sample of Arkansas teachers at each grade level K – 12 were tested using national normed economic literacy tests designed to …

The Aspirations Of Youth In Arkansas: A Comparison Of Rural Locales, Hanna Elizabeth Kildow Estes

Graduate Theses and Dissertations

Rural youth are leaving their home communities in search of economic opportunity. Students’ residential, occupational, and educational aspirations are effective predictors of life choices, such as future residence. This study’s purpose was to determine the aspirations of rural students in Arkansas overall, and by locale. This study used descriptive survey methodology and a stratified random sample of 15 rural schools to determine the respondents’ (n = 133) aspirations, expectations for the future, and perception(s) of their home community.

Overall, a majority of respondents indicated they want to leave their home communities and obtain at least a bachelor’s degree. Nearly half …

Text-Independent Speaker Identification Using Statistical Learning, Alli Ayoola Ojutiku

Graduate Theses and Dissertations

The proliferation of voice-activated devices and systems and over-the-phone bank transactions has made our daily affairs much easier in recent times. The ease that these systems offer also call for a need for them to be fail-safe against impersonators. Due to the sensitive information that might be shred on these systems, it is imperative that security be an utmost concern during the development stages. Vital systems like these should incorporate a functionality of discriminating between the actual speaker and impersonators. That functionality is the focus of this thesis.

Several methods have been proposed to be used to achieve this system …

"To The World, Or Rather To Those Who Are Left” A Director’S Journey Into Ionesco’S The Chairs, Kholoud Sawaf

Graduate Theses and Dissertations

The following is a journal documenting my process directing Eugene Ionesco’s The Chairs at the University of Arkansas in Spring 2015. The chapters include the script selection process, casting, analysis, design process, rehearsal process, and production evaluation.

Synthesis Of Palladium And Palladium-Copper Nanostructures As Electrocatalysts, Haibin Wu

Graduate Theses and Dissertations

Pd and its alloys are alternatives of Pt as promising catalysts and electrocatalysts for many reactions. Size controlled synthesis of nanoparticles remains a major research subject, since smaller size particles show better catalytic performance. In this work, we developed a modified chemical wet method to prepare Pd and Pd-Cu nanostructures with uniform small size. Different sizes and shapes of Pd nanostructures were successfully synthesized by using the two reducing agents (i.e., L-ascorbyl-6-palmitate or phenylphosphinic acid). The reducing agents play a role to control the final morphologies and sizes of particles. The use of L-ascorbyl-6-palmitate favors to form irregular branch shapes …

The Fascination Of Manga: Cross-Dressing And Gender Performativity In Japanese Media, Sheena Marie Woods

Graduate Theses and Dissertations

The performativity of gender through cross-dressing has been a staple in Japanese media throughout the centuries. This thesis engages with the pervasiveness of cross-dressing in popular Japanese media, from the modern shōjo gender-bender genre of manga and anime to the traditional Japanese theatre. Drawing on theories from gender-studies and performance aesthetics to delineate the female gender in traditional Japanese theatre, I follow the roles of, representation of, and media for women, concentrating on (1) manga, a form of sequential art featuring illustrations with corresponding text, (2) anime, animated productions (where the word anime is the abbreviated pronunciation of “animation” in …