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Graduate Theses and Dissertations

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Multiple Output Power Supply Using Toroidal Transformers For Medium Voltage Active Gate Drivers, Samhitha Venkata Machireddy May 2023

Multiple Output Power Supply Using Toroidal Transformers For Medium Voltage Active Gate Drivers, Samhitha Venkata Machireddy

Graduate Theses and Dissertations

When operating in high power applications, power devices dissipate tens or hundreds of watts of power in the form of heat. The ability of the power devices to withstand power and dissipation of heat across the power devices becomes a prominent requirement in designing the power converter. This challenge demands a power converter design to be more effective and consistent which factors in size, cost, weight, power density and reliability. This study aims to propose a gate driver isolated power supply design that can be used in medium voltage applications (e.g., up to 10 kV) while respecting the principle of …

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Green Infrastructure In The Ozarks: Northwest Arkansas Development Policy And The Open Space Plan, Daniel Holtmeyer May 2023

Green Infrastructure In The Ozarks: Northwest Arkansas Development Policy And The Open Space Plan, Daniel Holtmeyer

Graduate Theses and Dissertations

Northwest Arkansas regional planning authorities in 2016 released the Northwest Arkansas Open Space Plan, a voluntary document outlining ways to protect and preserve important open spaces even as the region’s population balloons and urban development spreads outward. No one appears to have made a systematic attempt to gauge the Plan’s impact on development decisions, however. In this thesis, I conduct a qualitative survey of several cities and counties’ planning codes and comprehensive plans to determine how much these policies have in common with the Open Space Plan’s essential principles. From that survey, I also conduct two case studies of recent …

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The Perceived Needs Of First Responders To Identify And Support Sex Trafficking Victims: A Case Study, Raja Kumar May 2023

The Perceived Needs Of First Responders To Identify And Support Sex Trafficking Victims: A Case Study, Raja Kumar

Graduate Theses and Dissertations

Researchers have found that sex trafficking in the 21st century is a growing human rights atrocity. This qualitative case study investigates law enforcement professionals’ perceived needs as first responders to identify and support sex trafficking victims. Specifically, this study examines resources, training, and support that they perceive to be critical to their success. The primary research question that guides this study is what do first responders need to identify and support sex trafficking victims? To answer this question, the following sub-questions facilitate the inquiry: A) What resources do law enforcement professionals need to identify and support victims of sex trafficking? …

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What Cognitive Processes Drive Attentional Bias, And How Does Stress Affect Them?, Colton L. Hunter May 2023

What Cognitive Processes Drive Attentional Bias, And How Does Stress Affect Them?, Colton L. Hunter

Graduate Theses and Dissertations

Attentional biases toward or away from emotionally evocative stimuli have been well documented and related to clinical outcomes such as social anxiety. Some work has suggested that stress modulates attentional biases, but there are a number of inconsistencies in this literature regarding the direction of that modulation, highlighting a need to examine moderators of that effect. Sex differences in stress effects could potentially explain this inconsistency, as acute stress can affect males and females differently. It is also possible that stress differentially influences multiple component processes underpinning attentional bias, but these processes have not been well character, and to date …

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Reproducibility And Replicability In Unmanned Aircraft Systems And Geographic Information Science, Cassandra Howe May 2023

Reproducibility And Replicability In Unmanned Aircraft Systems And Geographic Information Science, Cassandra Howe

Graduate Theses and Dissertations

Multiple scientific disciplines face a so-called crisis of reproducibility and replicability (R&R) in which the validity of methodologies is questioned due to an inability to confirm experimental results. Trust in information technology (IT)-intensive workflows within geographic information science (GIScience), remote sensing, and photogrammetry depends on solutions to R&R challenges affecting multiple computationally driven disciplines. To date, there have only been very limited efforts to overcome R&R-related issues in remote sensing workflows in general, let alone those tied to disruptive technologies such as unmanned aircraft systems (UAS) and machine learning (ML). To accelerate an understanding of this crisis, a review was …

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Potential Control Of Invasive Mesquite Through Improving The Consumer’S Understanding Of Liquid Smoke Applications., Seth W. Ellsworth May 2023

Potential Control Of Invasive Mesquite Through Improving The Consumer’S Understanding Of Liquid Smoke Applications., Seth W. Ellsworth

Graduate Theses and Dissertations

Mesquite trees continue to invade forests and range lands in many countries across the world. The cost to remove these trees is staggering. In Texas, landowners spent $25 million over a 10- year period to clear 300,000 ha of mesquite trees, a fraction of the 22 million ha of Texas land affected by this invasion. Estimates are that the mesquite continues to negatively impact one to two percent of additional land in selected counties each year in Texas. However, the problem is not unique to Texas, but rather to the 44 species of mesquite trees, belonging to the genus Prosopis …

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Mitral Valve Imaging And Biomechanics: A Workflow Towards Computational Modeling And Validation, Sam Stephens May 2023

Mitral Valve Imaging And Biomechanics: A Workflow Towards Computational Modeling And Validation, Sam Stephens

Graduate Theses and Dissertations

The mitral valve serves a critical role in healthy cardiac function by ensuring the unidirectional flow of oxygenated blood from the left atrium into the left ventricle. It experiences the highest pressures found within the heart and its closure is the result of a complex interaction of several different structures that, furthermore, are unique to each individual. Despite the valve’s vital role however, the specific function of these constituent structures is not fully understood. This, confounded by its asymmetric, personalized nature, make surgical interventions for the mitral valve far less effective than for its neighboring aortic valve. Efforts to overcome …

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A Contemporary Dressing Of Henrik Ibsen’S Hedda Gabler, Heidi Rose Decaluwe May 2023

A Contemporary Dressing Of Henrik Ibsen’S Hedda Gabler, Heidi Rose Decaluwe

Graduate Theses and Dissertations

The following thesis describes the process of creating the costume designs for the production of Hedda Gabler that was produced at the University Theatre at The University of Arkansas in the spring of 2023. In this thesis, I will explain the process, from my initial response to the script to the final stage production. Included is a full script analysis, an extrapolation of the stages of design, from research to rough sketches and preliminary renderings, final color renderings, the process of turning renderings into fully realized costumes, and finally an evaluation of the entire process.

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A Quantitative Examination Of The Impact Of Moderating Variables On The Experience Of Eudaimonic Outcomes, Brandon Lynn Lawson May 2023

A Quantitative Examination Of The Impact Of Moderating Variables On The Experience Of Eudaimonic Outcomes, Brandon Lynn Lawson

Graduate Theses and Dissertations

There has been a growing body of research looking into effects beyond enjoyment of media content. However, these explorations have primarily been outcome focused and have failed to analyze variables that could be mediating eudaimonic effects. This thesis examined the results of an experimental study investigating the variables of flow and realism and their possible impact on eudaimonic outcomes of video game play. Using data collected from 193 participants who played either the game The Last of Us Remastered or Elude, this study examined the possibility of flow mediating the relationship between realism and eudaimonic effects. Results of a hierarchical …

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Microorganisms In Extreme Environmental Conditions, Khanh Mai Nguyen May 2023

Microorganisms In Extreme Environmental Conditions, Khanh Mai Nguyen

Graduate Theses and Dissertations

Organisms are known to be able to prosper under normal and extreme environmental conditions, which are classified as mesophile and extremophile, respectively. Extremophiles can thrive under a large array of conditions, from pressures, temperatures, salinity, and pH to a combination of them. For example, to survive on the ocean floor, marine biomass must have its biomolecular machinery adapted to the high pressures and high salinity environment. Moreover, around the hydrothermal vents, aside from pressure and salinity, the microbes that live there also need to adjust to the temperature as well as the pH level. Aside from high temperatures, researchers also …

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Exploring Ferroelectric Phenomena In Batio3, Linbo3, And Liznsb: From Extended Oxygen Vacancies To Tri-Stable Polarization And Giant Hyperferroelectricity, Shaohui Qiu May 2023

Exploring Ferroelectric Phenomena In Batio3, Linbo3, And Liznsb: From Extended Oxygen Vacancies To Tri-Stable Polarization And Giant Hyperferroelectricity, Shaohui Qiu

Graduate Theses and Dissertations

This dissertation presents three projects that investigate the complex phenomena of ferroelectricity under different conditions in BaTiO3, LiNbO3, and LiZnSb using first-principles density functional calculations. Extended defects in ferroelectric solids play a crucial role in reducing the lifetime and performance of ferroelectric devices by causing fatigue, domain pinning, and aging. Thus, understanding their impact is of critical importance for the development of reliable and high-performance ferroelectric devices. In addition, hyperferroelectricity is an intriguing phenomenon that has attracted much attention in recent years. Despite the existence of depolarization field, spontaneous polarization persists under an open-circuit boundary condition (OCBC), making hyperferroelectric materials …

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Investigation The Plugging Behavior Of Virus Filters, Iman Abdulqader Saab May 2023

Investigation The Plugging Behavior Of Virus Filters, Iman Abdulqader Saab

Graduate Theses and Dissertations

A virus filtration step is integral to the manufacturing of biopharmaceuticals to ensure viral safety. A virus filter is a single-use device that uses a size-based separation process and has a unique structure with minimal defects, so that contaminating virus particles cannot pass through the membrane pores, while therapeutic molecules can. The development of novel antibodies (Abs), including significant increases in product titers, is frequently challenged by virus filter fouling, making a better understanding of the underlying mechanisms essential. This thesis focused investigating of the effect of prefilter types, buffer type and salt content on virus filtration performance. The impact …

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Ranking Highway Transportation Asset Criticality Through Stakeholder Input Using The Analytical Hierarchy Process (Ahp), Kwadwo Amankwah-Nkyi May 2023

Ranking Highway Transportation Asset Criticality Through Stakeholder Input Using The Analytical Hierarchy Process (Ahp), Kwadwo Amankwah-Nkyi

Graduate Theses and Dissertations

The transportation system is especially vulnerable to natural and human-made disasters which can have effects on mobility, safety, and the economy. This thesis presents a method to rank transportation assets based on their criticality to the transportation system by uniquely gathering stakeholder input on criticality criteria weights. This serves as a typical first step in vulnerability and resilience assessments. Six criteria were used to estimate asset criticality: Annual Average Daily Traffic (AADT), roadway classification, freight output, tourism output, Social Vulnerability Index (SoVI), and redundancy. Then, the criteria are combined via stakeholder input using a weighted ranking scheme called the Analytical …

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Validation Of A Novel Genomic Biomarker Of Mesenchymal Stem Cell Scalability And Evaluating Genotype Implications On Cellular Senescence, I Kade Karisma Gita Ardana May 2023

Validation Of A Novel Genomic Biomarker Of Mesenchymal Stem Cell Scalability And Evaluating Genotype Implications On Cellular Senescence, I Kade Karisma Gita Ardana

Graduate Theses and Dissertations

The market demand for hMSCs continues to increase along with the increasing popularity of hMSCs used in the research, medical and industrial fields. This increase has an impact on the need for good quality MSCs. This quality is determined by the ability of MSCs to proliferate and their resistance to senescence. Donor dependent heterogeneity may affect MSC qualities from one individual to another; therefore, a specific biomarker with the ability to identify individuals with desirable hMSC qualities is required. The GSTT1 gene has been found to be associated with hMSC scalability. This gene is deleted in about 38% of the …

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A Woman On Fire: A Character Study Of Hedda Gabler, Leah Paige Smith May 2023

A Woman On Fire: A Character Study Of Hedda Gabler, Leah Paige Smith

Graduate Theses and Dissertations

In this thesis I will be discussing my process in preparing and performing my thesis role of Hedda Gabler, and how it is relevant to modern struggles of women surrounding pregnancy, motherhood, and body autonomy. This is paralleled with the topic of my one-person show, titled 6 Weeks. I will include the events of both plays, the script of 6 Weeks, my character analysis of Hedda, the rehearsal process, production photos, resume, headshot, program, and a link to my website.

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How This Bitch Made This Bitch: A Play On Defiant Women Of Color, Adrienne B. Dawes May 2023

How This Bitch Made This Bitch: A Play On Defiant Women Of Color, Adrienne B. Dawes

Graduate Theses and Dissertations

The workshop production of my full-length, bilingual play “This Bitch: Esta Sangre Quiero” marks the culmination of my course of study at the University of Arkansas. In this thesis, I will discuss the development process of “This Bitch” from its humble Zoom reading beginnings to regional theater development to its workshop production as part of the university’s 2022-2023 Mainstage season. Through the lens of this new play process, I outline my artistic evolution during my four years of graduate school, interrogating and celebrating the ways this bitch has been inspired by “This Bitch.”

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Differential Electrostatic Interaction Patterns In Sars-Cov-1 And Sars-Cov-2 Variants: A Molecular Dynamics Simulation Study, Ugochi Hope Isu May 2023

Differential Electrostatic Interaction Patterns In Sars-Cov-1 And Sars-Cov-2 Variants: A Molecular Dynamics Simulation Study, Ugochi Hope Isu

Graduate Theses and Dissertations

The SARS-related coronavirus (SARS-rCoV) is a highly contagious virus that has raised significant worldwide health concerns. It caused outbreaks in 2002-2003 and more recently in 2019-2020 with SARS-CoV-2. SARS-CoV-2 is responsible for the COVID-19 pandemic, which has resulted in a significant global impact on health and the economy. The spike protein of the virus plays a critical role in its infectivity and transmission, and the receptor-binding domain (RBD) within the spike protein is of particular interest, as it is responsible for binding to the human angiotensin-converting enzyme 2 (ACE2) receptor. In this study, we used Molecular dynamics (MD) simulations to …

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Memento Mori: Philosophy For The Actor, Edwin C. Green May 2023

Memento Mori: Philosophy For The Actor, Edwin C. Green

Graduate Theses and Dissertations

This thesis explores a philosophy whose goal is to fuel and protect the spirit of the working professional actor. This philosophy greatly inspired my one person show performance and will serve me in my future. Included in this paper will be my artistic philosophy, my resume, headshot, website, photos, and my one person show script, developed in the spring of 2022, titled“Memento Mori”.

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How Authentic Professional Development And Instructional Coaching Support The Successful Implementation Of Trauma-Informed Practices, Meleah Dannelle Hoskins May 2023

How Authentic Professional Development And Instructional Coaching Support The Successful Implementation Of Trauma-Informed Practices, Meleah Dannelle Hoskins

Graduate Theses and Dissertations

The purpose of this action research study was to examine how authentic professional development and instructional coaching can support the successful implementation of trauma-informed practices at two elementary schools, School A and School B, in Ridgedale School District (pseudonym) (RSD). RSD is a small urban school district in Oklahoma. This study sought to identify the support teachers need to implement trauma-informed practices and the barriers that may affect the implementation. This mixed methods action research study encompassed evidence from multiple qualitative and quantitative data sources within the four phases of the action research spiral (Herr & Anderson, 2014). While utilizing …

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The Scenic Design: Songs For A New World By Jason Robert Brown, Morgan Mcinnis May 2023

The Scenic Design: Songs For A New World By Jason Robert Brown, Morgan Mcinnis

Graduate Theses and Dissertations

Songs for a New World by Jason Robert Brown was produced by the University of Arkansas Department of Theatre as the final show of the 2022-2023 season. The musical comprises sixteen independent songs taken from Brown's work on various projects, coming together to create a collection of scene-songs that examines life and the choices we make. While each song's storyline is different and musically distinctive, each presents similar stories of characters facing a moment of decision in their lives and an opportunity to transition from old to new. The result is neither an ordinary musical nor revue but a theatrical …

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Investigating Effect Of Seed Source And Developing Germination Protocols To Improve Success In Restoration Of Arkansas Tallgrass Prairies, Rhiannon Spencerosa May 2023

Investigating Effect Of Seed Source And Developing Germination Protocols To Improve Success In Restoration Of Arkansas Tallgrass Prairies, Rhiannon Spencerosa

Graduate Theses and Dissertations

American tallgrass prairie has faced losses estimated at 87-98% of original land area since European settlement. Native seeds are often used to supplement struggling or extinct plant populations in tallgrass prairie restoration and establishment sites. Two main considerations in restoration and establishment are from where to source seed and how to obtain high germination rates. In order to determine the effect of seed source, a common garden experiment was performed in Fayetteville, Arkansas in 2022 with five prairie species: Andropogon gerardii (big bluestem), Bouteloua curtipendula (sideoats grama), Panicum virgatum (switchgrass), Schizachyrium scoparium (little bluestem), and Sorghastrum nutans (Indiangrass). Seed was …

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Health-Oriented Nonprofit Organizations: The Influence Of Framing And Altruism On Intention To Donate, Abbey Dilatush May 2023

Health-Oriented Nonprofit Organizations: The Influence Of Framing And Altruism On Intention To Donate, Abbey Dilatush

Graduate Theses and Dissertations

This study investigated the influence of framing and altruism on individuals' intentions to donate to a health-oriented nonprofit organization. One hundred ninety-three participants were recruited from social media to complete an experiment online. Participants reviewed fundraising messages using either a statistical frame or a narrative frame. Following the presentation of a fundraising message participants completed close-ended self-report scales to evaluate their perceptions of the ad, their intentions to donate, and their personal altruism. Results demonstrated there was a correlation between intention to donate and ad evaluation. Next, there was no relationship between altruism and intention to donate and neither frame …

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The Role Of Multiracial Identity On Chronic Health Conditions In The U. S.: Evidence From The Behavioral Risk Factor Surveillance Survey, Anna Ruth Jinlong Wahls May 2023

The Role Of Multiracial Identity On Chronic Health Conditions In The U. S.: Evidence From The Behavioral Risk Factor Surveillance Survey, Anna Ruth Jinlong Wahls

Graduate Theses and Dissertations

Abstract Racial identity as it informs health disparities has largely been examined using monoracial groups and a binary framework. This study, informed by critical race theory and stress process theory, investigates the relationship between multiracial identity and health. Data from the 2021 Behavioral Risk Factor Surveillance Survey, a national telephone survey that collects health data on adult aged respondents, will be analyzed using a set of regression techniques. Specifically, the number of chronic health conditions reported by those identifying with more than one race will be compared to the number of conditions reported by monoracial individuals.

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Lgbtqia+ People And Religious Trauma, Cira Abiseid May 2023

Lgbtqia+ People And Religious Trauma, Cira Abiseid

Graduate Theses and Dissertations

Many lesbian, gay, bisexual, transgender, queer (or questioning), intersex, and asexual people (LGBTQIA+) experience religious trauma caused by the harmful messaging often aimed at sexual and gender minorities. Identity dissonance can be created when LGBTQIA+ people find their religious and sexual or gender minority identities at odds with each other. A review of existing literature revealed themes of identity erasure, internalized homophobia, and resilience, but there was limited research involving this population. This qualitative study centers the voices of those who have experienced religious trauma based on their identities and works to understand their healing journeys. Fifteen LGBTQIA+ individuals participated …

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The Mental Health Experiences Of Daca Recipients And Non-Daca Recipients, Lizeth Ariana Guadalupe May 2023

The Mental Health Experiences Of Daca Recipients And Non-Daca Recipients, Lizeth Ariana Guadalupe

Graduate Theses and Dissertations

Millions of immigrant children without legal status grow up in the U.S. and aspire to live and thrive in American society. However, without legal status, they face challenges in integrating into society. Implemented in 2012, the Deferred Action for Childhood Arrivals (DACA) program was created to help immigrant youth integrate into society by providing them with work permits, facilitating educational opportunities, and protection from deportation. However, not all immigrant children qualify for DACA, and the recent legal challenges to DACA prohibit new applicants and put roughly 600,000 recipients in legal limbo. The research questions this study poses are 1.) How …

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A Hero's Status In Two Lenguas, Ana Karen Miramontes Loya May 2023

A Hero's Status In Two Lenguas, Ana Karen Miramontes Loya

Graduate Theses and Dissertations

This thesis consists of my statement of artistry, and documentation of artistic materials and thesis related performances.

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Teacher Attrition In Arkansas Public Schools: Perceptions Of The Impact Of The Covid-19 Pandemic On Career Choices, Kirstyn Salehi May 2023

Teacher Attrition In Arkansas Public Schools: Perceptions Of The Impact Of The Covid-19 Pandemic On Career Choices, Kirstyn Salehi

Graduate Theses and Dissertations

The COVID-19 pandemic had a significant impact on teacher attrition in Arkansas, with many educators facing unprecedented challenges and stressors in their work. However, public data does not give context to why teachers chose to leave. This study aimed to investigate teacher perceptions of the impact of the pandemic on attrition in Arkansas through a survey. To do this, the study set out to determine what factors influenced Arkansas teachers to leave or consider leaving, their positions and the impact that the pandemic had on those choices, and what factors influenced, or could influence, teachers to stay in their position. …

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Role Of Carbohydrate Source As Part Of A Higher Protein Diet On Markers Of Metabolic Syndrome, Ada-Miette Josephine Thomas May 2023

Role Of Carbohydrate Source As Part Of A Higher Protein Diet On Markers Of Metabolic Syndrome, Ada-Miette Josephine Thomas

Graduate Theses and Dissertations

Obesity has become a major health crisis in the United States and across the globe [1]. Recent findings suggest that approximately 50% of U.S. adults will have obesity and 25% will have severe obesity (body mass index (BMI) > 40 kg/m2) by the year 2030 [2]. Obesity-related cardiometabolic dysfunction is a significant public health concern [3, 4]. As rates of obesity increase, so too does prevalence of the metabolic syndrome [5]. In the United States, incidence of Metabolic syndrome (MetS) increasing, with approximately one in three adults qualifying for a diagnosis [6, 7]. MetS is a grouping of cardiometabolic risk factors …

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Children’S Disclosure Of School Bullying: The Relation Between Peer Victimization, Internalizing Symptoms, Negative Affect, And Gender, Julia L. Kiefer May 2023

Children’S Disclosure Of School Bullying: The Relation Between Peer Victimization, Internalizing Symptoms, Negative Affect, And Gender, Julia L. Kiefer

Graduate Theses and Dissertations

Children who are bullied by their peers are at risk for several negative developmental outcomes and are therefore advised to tell an adult when they are. However, victims of school bullying are often reluctant to disclose to adults that they are being bullied. Some bullied children also experience symptoms of anxiety or depression, which could further reduce their likelihood of telling an adult. In this study, I tested the degree to which children’s internalizing symptoms predicted their likelihood of telling adults about being bullied at school, and if this relation was exacerbated by children’s negative feelings associated with telling an …

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Identifying Predictors Of Eventual Rural Practice Among Female Osteopathic Medical Students, Dana Kahl May 2023

Identifying Predictors Of Eventual Rural Practice Among Female Osteopathic Medical Students, Dana Kahl

Graduate Theses and Dissertations

The United States is facing a growing physician shortage that threatens the ability of our healthcare system to provide needed services. This shortage will be more acutely felt in rural and underserved areas. Osteopathic medical education, with its priority of primary care specialties, plays a significant role in meeting the healthcare needs of rural communities in America. The fastest-growing demographic of osteopathic physicians is women under the age of 45 (American Osteopathic Association, 2021). Additionally, for the first time in history, women outnumber men in medical schools, accounting for 51% of current medical students (Boyle, 2019). Who is admitted to …

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