Digital Commons Network^™

Neurobiological Mechanisms Of Attention In Adolescents, Virginia Clark

All Dissertations

Adolescence is a transformative developmental period characterized by profound biological, neurological, and behavioral changes. This dissertation investigates the neurobiological underpinnings of attention in adolescents, emphasizing how internal mechanisms influence and individually shape cognitive development through the endosystem. Rooted in the intersection of human development, learning sciences, and cognitive neuroscience, this work argues for a more integrated understanding of attention as a fundamental cognitive function for learning, one that is behaviorally seen but also biologically and neurologically driven. While developmental science has often emphasized external influences such as family, culture, and environment, this work centers on the adolescent’s internal biological systems …

Integrating Incentive Design And Spatial Prioritization For Climate-Smart Forestry Adoption In South Carolina, United States, Miah Maye Pormon

All Dissertations

Forests provide essential ecosystem services, including carbon sequestration, water regulation, timber production, and habitat provision. However, increasing development pressures and land-use changes threaten forest persistence and long-run ecosystem service provision. Climate-smart forestry (CSF) practices, such as improved forest management and extended rotation, offer opportunities to enhance carbon storage, forest resilience, and economic livelihoods. The effectiveness of these practices depends on forest owners’ participation and the strategic allocation of financial resources or incentives. This dissertation develops an integrated framework that combines behavioral economic analysis and mapping to improve the design of current incentive programs. The first chapter employs the Contingent Valuation …

Development Of A Mixing-Controlled Combustion Model For 0d Engine Modeling: Using High-Order Models To Guide The Formulation Of Reduced-Order Models, James Gohn

All Dissertations

Vehicles are becoming increasingly complex to comply with the increasingly stringent regulations placed on all market sectors while still maintaining performance requirements. This increased complexity leads to increases in the cost and time it takes to develop and produce these next generation vehicles. To meet demand therefore, it becomes necessary to evaluate numerous design iterations using computer models. There are multiple levels of models that may be necessary for different purposes or use cases. All levels of modeling for virtual prototyping, however, require a level of validation and predictive ability to be useful. To this end, the following thesis presents …

X-Raying The Material Surrounding Active Supermassive Black Holes, Isaiah S. Cox

All Dissertations

It is important to understand the nature of the gas and dust immediately surrounding the supermassive black hole (SMBH) in active galactic nuclei (AGN), because this material feeds the accretion disk and couples the activities going on at the AGN scale to the host galaxy. However, there remain large uncertainties on basic properties about this material such as its location and distribution. This is primarily due to the difficulties in resolving spatial information on these scales at extragalactic distances.

AGN emit a tremendous amount of radiation all across the electromagnetic spectrum, including X-rays. The X-rays come from a very small …

Exploring The Training Experiences Of Adult Taekwondo Practitioners: A Case Study Of A Martial Arts Program In The Southern United States, Nicholas Daniel Ryburn

Graduate Theses and Dissertations

Taekwondo has gained increasing prominence among adult practitioners in the United States, offering both physical and psychological benefits. However, despite its popularity, research on Taekwondo has predominantly emphasized youth populations, competitive contexts, or injury epidemiology, with limited attention to the lived experiences of adult practitioners. Adults present distinct needs and challenges in martial arts training, including variability in physical conditioning, age-related health considerations, and constraints associated with family and professional responsibilities. A deeper understanding of these factors is crucial for developing training programs that are both effective and sustainable for adult populations. This dissertation employs a qualitative case study design …

Cultivating Excellence: The Relationship Between Educator Professional Development And Adult Student Success In Arkansas, Marsha Taylor

Graduate Theses and Dissertations

This quantitative study will investigate the relationship between Arkansas adult education teachers' engagement in professional development and their average classroom achievement, as indicated by students' measurable skill gains (MSGs). The study, informed by Dreyfus's (2004) model of skill acquisition, will examine the impact of the quantity of professional development hours, teachers' employment status (full-time or part-time), and the focus of professional development (content versus other domains) on classroom outcomes. Survey data on professional development involvement will be collected from Arkansas adult education teachers using a cross-sectional, regression-based design and subsequently linked to achievement data from the LiteracyPro system. Five hypotheses …

The Impact Of Life Coaching On Self-Efficacy In Personal Goal Setting Among Black Educators In Arkansas, Veronica Cousette Jackson

Graduate Theses and Dissertations

This quantitative study examines the relationship between life coaching and self-efficacy in personal goal setting among Black educators in Arkansas, with gender explored as a moderating variable. Self-efficacy, grounded in Bandura’s (1997) social cognitive theory, is a central determinant of motivation and goal-directed behavior, influencing persistence, effort, and adaptive strategies. Although life coaching has gained recognition as a professional developmental practice, empirical research remains limited regarding its psychological effects within educator populations and its differential impact across demographic groups (Grant, 2014; Theeboom et al., 2014). This gap is particularly significant for Black educators, who experience disproportionate workforce stress and retention …

Support Leads To Success: Exploring Culturally Responsive And Relevant Education For Tertiary Level Students Of Color, Aisha Milaham

Graduate Theses and Dissertations

Culturally responsive and relevant education (CRRE) teaching practice are crucial to implement at the tertiary level to support post-graduate preparation for students from marginalized communities. This case study explores the impact, or lack thereof, of these teaching principles in a higher education program specifically created to support diverse populations of students in preparing for graduate level studies and professions in academia. Data were collected via one-on-one interviews with students and staff in the program. Data were then analyzed to explore the extent to which culturally CRRE principles were integrated into TP and how that integration impacted student preparation for academia. …

Creatures Of Habit? Impact Of Chick Feeder Tray Location On Feed Consumption At 0-7 Days Of Age, Emily Kate Green

Graduate Theses and Dissertations

Early chick nutrition is critical for establishing target growth performance characteristics in broiler chickens. This study evaluated factors within commercial broiler houses that potentially influence feed consumption during the first 7 days. Three trials were conducted in a 12.2 x 122 m commercial broiler house to assess the effects of house sectioning, spatial barriers, and feedline location. In Trial 1, a one-way experimental design was used in which the house was divided into four equal sections using migration fencing every 30.5 m. House sections served as a fixed factor. Feed was provided using chick trays placed beneath the feed line …

‘Enemy Communist Cocksuckers’: Conceptualizing Patriotic Masculinity In Threats To Election Officials, Alma Harrison

Graduate Theses and Dissertations

Research on political violence demonstrates how certain aspects of masculinity are linked to asserting ideological authority and reinforcing exclusionary social identities through physical aggression, such as assaults, homicides, and gender-based violence. However, little research analyzes the use of violent threats as masculinity performances to achieve these same ends. To address this gap, this study analyzes messages from qualitative interviews with 26 election officials who experienced violent threats, examining performances of a distinct form of masculinity – patriotic masculinity – which fuses hegemonic masculine norms with patriotic values. Findings reveal ways in which actors construct and perform patriotic masculinity to frame …

Advancing Apparel Education Through 3d Simulation In Vstitcher: Confidence, Competence, And Career Readiness In Higher Education, Jonah Diniakos Graham

Graduate Theses and Dissertations

The rapid adoption of 3D garment simulation in the apparel industry has created new demands of higher education to better prepare students with both technical proficiency and confidence within digital design platforms to better enable them for many career avenues. This study examines the integration of Browzwear’s VStitcher in an undergraduate apparel production course, addressing the need to assess both competence and self-confidence in digital garment construction while also fostering broader career readiness competencies. Guided by a combination of Self-Determination Theory (SDT) and Situated Expectancy-Value Theory (SEVT), the study emphasizes the role of autonomy, competence, and relatedness in the shaping …

Caregiver Self-Reflection: Does It Matter? A Study Of The Relationship Between Caregiver Self-Reflection And Participation In Home Programs In Outpatient Pediatric Physical Therapy Settings, Andrea Myane

Graduate Theses and Dissertations

Despite evidence that caregiver coaching can improve patient outcomes and caregiver participation, little information exists on the effects of its individual components. Additionally, previous research has highlighted the importance of home programs in improving pediatric physical therapy outcomes. The aim of this study is to explore the role that caregiver self-reflection, a component of caregiver coaching, plays in facilitating outcomes in the pediatric physical therapy outpatient setting. Caregivers will be asked to complete a series of self-reflection questions based on Gibbs’ Reflective Cycle, while also recording the number of minutes they spend facilitating a prescribed home program. All study participants …

Quantifying The Short-Term Hydrogeologic Responses Of Highway Construction In Hot Springs, Arkansas, Billy Jack Summerford

Graduate Theses and Dissertations

In late 2020, excavation for the Highway 5 Bypass in Hot Springs, Arkansas exposed seepage faces along roadcut walls. Groundwater levels at nearby wells decreased by up to 20.9 ft and have remained ~20 ft below pre-construction values on average. This study quantifies changes in storage in the unconfined aquifer within the Hot Springs thermal recharge zone associated with the seepage faces using a numerical groundwater model calibrated to pre-construction head at well ARb4. Model scenarios are used to evaluate whether construction-induced seepage or drought best explains the decrease from late 2020 to early 2021. The numerical groundwater simulation represented …

Advancement In Electrochemical Generation-Collection: Snapshot Redox Cycling Voltammetry For Rapid Analysis At Chip-Based, Individually Addressable Microband Electrode Arrays, Blake Aleck Sterling

Graduate Theses and Dissertations

Snapshot redox cycling voltammetry (Snapshot RCV) is introduced as a rapid electrochemical technique that reconstructs the current-potential profile of a redox active species using a microband electrode array. By simultaneously biasing individual generator electrodes alternating in the array to different voltages across the analyte’s potential range while individually holding collector electrodes at a reversing potential, “spatial” voltammetry is achieved in as little as 1 s with the temporal speed of chronoamperometry, rapidly capturing the steady-state redox cycling (RC) profiles. During RC (a mode of generation-collection), the analyte is oxidized (or reduced) at generator electrodes and converted back at neighboring collector …

Explainability In Deep Learning For Density Regression, Dalton James Oxford

Graduate Theses and Dissertations

Classical statistical methods focus on explainability and inferential power. Machine learning and deep learning can handle non-linear, high-dimensional data better than traditional methods. In modeling, a clear understanding and interpretation are essential to decision-making. Recent work in quantile regression and extreme modeling has begun to use deep learning due to its performance on high-dimensional, non-linear data. Semi-Parametric Quantile Regression (SPQR) is a nonparametric spline-based approach to quantile regression that estimates the conditional PDF and CDF of the response. Semi-Parametric Quantile Regression for Extremes (SPQRx) is a recent extension of SPQR that provides two features: out-of-sample estimation and accurate extreme-tailed estimation. …

Mechanisms Of Bacterial Glucokinase Inactivation Through Site-Specific Lysine Modification And Chemical Inhibition, Joseph Robert Will Andrews

Graduate Theses and Dissertations

Glycolysis and related metabolic pathways are controlled by various post-translational modifications (PTMs) that affect enzyme activity and metabolic flow. In E. coli, glucokinase (GLK) sits at the crossroads of glycolysis and the pentose phosphate pathway and carries out the first committed step of glycolysis: ATP-dependent phosphorylation of glucose. While it's known that glucose binding causes GLK to close its domains, how phosphate binding, lysine modification, and small-molecule inhibitors regulate GLK's shape and function is still not fully understood. Here, I combine structural biochemistry and enzymology to figure out how phosphate binding, specific mutations, and chemical inhibitors affect E. coli GLK. …

Dutiful Wife, Grieving Mother: Examining Medieval Joban Allusion Through A Matricentric Affective Lens, Morgan Lee

Graduate Theses and Dissertations

This thesis uses concepts of matricentrism and affect to examine the legacy of Job and its frequent medieval allusions in stories featuring grieving mothers. It specifically analyzes how, in order to be considered noble, steadfast sufferers, women were expected to relinquish their maternal grief and adopt a stoic affect. This was often to the benefit of or in the direct service of their husbands. The analysis covers three women in particular: Job’s wife (who is examined through the medieval commentary written about her), Prudence from Chaucer’s "Tale of Melibee," and Griselda from Chaucer’s "Clerk’s Tale." This thesis utilizes medieval conduct …

Toward Causal Generative Modeling: From Representation Learning To Controllable Generation, Aneesh Komanduri

Graduate Theses and Dissertations

The hallmark of human intelligence is causal reasoning, the ability to infer relationships between causes and effects through observation and intervention. While modern deep learning has excelled at identifying statistical patterns, current generative models often struggle to capture the underlying structural causal mechanisms of the data-generating process, leaving them vulnerable to shortcut learning and spurious associations. To achieve true generalizability and interpretability, artificial intelligence must transition from simple association to higher-level causal reasoning to be capable of scheduling and planning in the real world. This dissertation develops fundamental methodologies for causal generative modeling by integrating Pearl’s Structural Causal Model (SCM) …

Deciphering Chemomechanical Couplings In Proteins Using Molecular Dynamics And Enhanced Sampling Techniques, Matthew Brownd

Graduate Theses and Dissertations

Proteins function through a complex interplay between chemical interactions and mechanical motions across multiple spatial and temporal scales. Understanding how ligand binding, conformational dynamics, and structural flexibility collectively regulate protein function remains one of the central challenges in molecular biophysics. This dissertation presents a computational investigation into chemomechanical coupling in three distinct classes of biomolecular systems using all-atom molecular dynamics (MD) simulations and enhanced sampling methods, with particular emphasis on free-energy calculations and long-timescale conformational analysis. The first part of this work focuses on ligand binding in hyperpolarization-activated cyclic nucleotide-gated (HCN) channels, which regulate rhythmic electrical activity in the heart …

Evaluation Of The Weed Control Efficacy And Potential Economic Returns Of An Autonomous Weeder In Vegetable Production Systems, Claire Plassmeyer

Graduate Theses and Dissertations

Vegetable production requires intensive weed management. Conventional producers rely on herbicide applications to manage weeds effectively at low costs; however, growers are under pressure to minimize chemical use due to environmental concerns and increased incidences of herbicide resistance. Non-conventional systems, including organic and sustainably focused small-scale production, rely primarily on cultural practices and physical weed control methods, which are labor-intensive and costly due to limited labor availability and rising wages. These concerns have prompted the development of autonomous weeding devices, such as unmanned ground vehicles (UGVs) equipped with navigation sensors and implements to provide repeated, high-precision weed control. Compact devices …

Developmental Assets And Risk-Related Restraint And Resistance Orientations Among Emerging Adult College Students: Examining Protective Associations, Summer N. Beck

Graduate Theses and Dissertations

Abstract Background: Although developmental assets are well established as protective factors during childhood and adolescence, less is known about their role during emerging adulthood, a period when the prevalence of several types of risk behaviors peak. For the U.S. college student, campus can provide ideal conditions for supporting the extended transition to adulthood. However, that same environment may increase exposure to health risk behaviors. This study examined associations between developmental assets and the risk-related restraint and resistance orientations involving sexual activity, alcohol, and illicit drugs among emerging adult college students. Methods: A cross-sectional correlational design was employed with a sample …

Asynchronous Polymorphic Logic Locking, Kelby Haulmark

Graduate Theses and Dissertations

This work presents Asynchronous Polymorphic Logic Locking (APLL), a logic locking methodology that integrates polymorphic logic within the Multi-Threshold NULL Convention Logic (MTNCL) paradigm. APLL achieves Boolean satisfiability-attack resilience through a fault-based logic stripping approach followed by logic restoration, while leveraging the analog, dual-functionality of polymorphic gates to impede reverse engineering and removal attacks. In contrast to comparable SAT-resistant logic locking techniques, APLL provides inherent resistance to reverse engineering, reducing the viability of a broad class of attacks that rely on access to the locked netlist. A complete automated design flow is developed, enabling the transformation of combinational circuits into …

Groundwater Responses To Tidal Restoration At Pelican Marsh And Sea-Level Rise In Elkhorn Slough, California, Julie E. Nelson

Graduate Theses and Dissertations

Coastal wetlands represent a dynamic but vulnerable terrestrial-aquatic interface with future resilience controlled by historic hydrologic alterations, sea-level rise, and groundwater extraction. In diked coastal settings, poor tidal connectivity can degrade habitat from the impoundment of freshwater or hypersaline surface waters. Restoring tidal connectivity could foster marsh revitalization, but altering the surface hydrologic system could lead to unwanted salinity intrusion in shallow aquifers. Saline groundwater intrusion degrades freshwater quality and, while inevitable with sea-level rise, could be accelerated with tidal marsh restoration. To investigate this, I developed a steady-state groundwater flow model of Pelican Marsh, a diked, muted tidal marsh …

The Use And Implications Of Visual Production Choices: Evidence From Presidential Debates And Political Interview, Emma Lorraine Rasmussen

Graduate Theses and Dissertations

Live television production has long been a powerful tool for broadcasting media to curate what an audience sees and understands about aired material. Production techniques used by broadcasting companies have the power to influence how audiences perceive and interpret political candidates. In Study One, the two 2024 presidential debates were analyzed for a variety of different trends including: who was on screen, the different camera shots used, and camera movement. Video formats of the 2024 CNN and ABC debates were coded using Observer XT, a content analysis software and were examined for the frequency and duration of each behavior. Patterns …

Unpacking The Tension: A Study Of Teacher Experiences With School District Data Use Processes, Mindi Gates

Graduate Theses and Dissertations

The purpose of this mixed methods study was to understand why data conversations and processes at Wildcat School District (WSD) created discomfort for teachers. The research utilized both survey and interview data to understand teachers’ experiences as they engage in data use conversations. Participants of this study included certified teachers at WSD who participated in monthly collaborative team meetings. Grade and content level meetings are commonplace at WSD. In many cases, teachers are given time at least once per week to engage in collaborative conversations about their work (DuFour & Fullan, 2013). However, as a principal at WSD I have …

Where Doubts Fade And Stars Glow: A Costume Designer’S Journey In Silent Sky By Lauren Gunderson, Randy Tabiliran Olarte

Graduate Theses and Dissertations

This study employs a practice-based design methodology grounded in historical research, visual analysis, material experimentation, and collaborative production processes. This thesis, Where Doubts and Stars Glow: A Costume Designer’s Journey for Silent Sky by Lauren Gunderson, explores the process of design and creation of costumes for the production of Silent Sky at the University of Arkansas. Silent Sky portrays an astronomer whose work in the early 1900s profoundly impacted the study of photographic plates for mapping stars. Specifically, the astronomer closely analyzes Cepheid variable stars, discovering that their consistent brightness fluctuations aid in determining stellar distances and the universe's size. …

The Effects Of Vocational Self-Concept Crystallization And Career Choice On Crop Farming Apprenticeship Completers: An Exploratory Qualitative Analysis, Stormy Zane Speaks

Graduate Theses and Dissertations

Across the United States, a farmer shortage threatens the future of food production as the population continues to grow. However, farming apprenticeship programs may be a solution to this crisis. This study addressed a gap in research regarding the career decision-making processes of farm apprenticeship completers. Specifically, this study sought to identify whether farm apprenticeship completion resulted in greater vocational self-concept crystallization as well as farming as a career choice. Due to the lack of research, an exploratory qualitative research design was most suitable for this study. Donald Super’s self-concept development theory was the theoretical framework. Self-concept development theory was …

Developmental Mathematics As A Potential Barrier To Degree Completion In Community Colleges, Cynthia Bernice Fletcher

Graduate Theses and Dissertations

Developmental mathematics is often seen as a barrier to student progression in community colleges, especially for students pursuing Associate of Science degrees requiring math coursework. This quantitative, ex post facto, non-experimental study examined how developmental mathematics factors predicted Associate of Science degree completion at a two-year community college in the West South-Central United States. Specifically, it assessed how academic performance in developmental mathematics, placement method, math pathway, and number of developmental math courses related to Associate of Science degree completion, as well as differences across student subgroups. Archival institutional data were used for first-time-in-college students across four cohorts: 2018, 2019, …

Silent Sky: Exploring The Universe Of Theatre Through A Directorial Lens, Sarah Behrend-Wilcox

Graduate Theses and Dissertations

This thesis documents the directorial process of a production of Lauren Gunderson’s Silent Sky, produced by the University of Arkansas Department of Theatre. This document follows the director’s journey from initial script analysis through closing night, with an emphasis on the successes and challenges found in mounting this fully realized, artistically unified production. The central argument of this thesis is that through careful documentation of a single production, it is possible to identify both successful strategies and areas for growth in the collaborative process. This thesis is organized in four chapters: The Big Bang, The Matter, The Dark Matter, and …

Are Sticky Prices Present In Us Ag Land Lease Rates, John Tyler Blazzard

Graduate Theses and Dissertations

Land is an essential resource in production agriculture. Limited supply and high demand for land have resulted in increasing land values which are a barrier to entry for beginning farmers and ranchers with limited access to capital and credit. One way to overcome the high costs of purchasing land is to lease it. While more affordable than purchasing land, cash rents are also increasing. The objective of this research is to determine whether agricultural cash rents follow farm income symmetrically over time. This is accomplished by implementing Ordinary Least Squares (OLS) regressions with two-way fixed effects which account for rental …