Digital Commons Network^™

Root-Cause-Analysis Of Crane System Variable Frequency Drive Failures Through Testing And Power Quality Analysis, Elizabeth Hayes

Theses and Dissertations

This study investigates the root-cause-analysis of repeated failures of an AC-DC converter in a variable frequency drive system on a 325-Ton crane through electrical testing based on NETA and IEEE standards. The testing is accompanied with a power quality study based on the IEEE 519-2019, simulation using SKM power modeling software, and fault study from two captured faults. The converter failures presented no immediate solution despite experienced technicians, engineers, and other specialists. This study attempts to eliminate root-cause by examining the line-side equipment and in-feed power quality as contributions to the converter faults.

Plasma Pharmacokinetics Of Topical 0.1% Diclofenac Sodium And 0.5% Ketorolac Tromethamine In Dogs, Jacqueline Peraza

Theses and Dissertations

To determine plasma concentrations of ophthalmic 0.1% (w/v) diclofenac sodium and 0.5% (w/v) ketorolac tromethamine following 4 times daily ophthalmic administration in healthy dogs. Eight dogs were randomly assigned to a diclofenac or ketorolac group. Plasma was collected before drug administration. Plasma samples were collected after the 4 pm treatments on days 1 and 5. Plasma concentrations (ng/mL) were quantified by liquid chromatography-mass spectrometry and analyzed with noncompartmental pharmacokinetic analysis. After ophthalmic administration of 0.1% diclofenac, mean t1/2, Tmax, and Cmax occurred at 3.08 0.9 hours, 121.4 2.8 hours, 0.12 0.05 ug/mL, respectively. The mean t1/2, Tmax, and Cmax after …

Nesting Ecology And Responses To Snag Resource Fluctuations Of Red-Headed Woodpeckers In Working Pine Forests, Zoe Elise Scott

Theses and Dissertations

Southeastern working pine forests provide opportunities for sustainable management that balance conservation and economic objectives. Red-headed woodpeckers (Melanerpes erythrocephalus), as primary cavity excavators, play a disproportionate role in forest ecosystems, making them an ideal focal species for evaluating management strategies. From 2024-2025, we monitored 103 nesting attempts in loblolly pine (Pinus taeda) forests of Mississippi and Alabama, assessing nest site selection and survival. Nests were concentrated in early successional stands, with selection favoring taller snags with advanced decay characteristics, greater understory cover, and north-to-west cavity orientation. Nest survival increased with reduced cavity accessibility. Simulation models of varying snag retention levels …

Comprehensive Study Of The Durability And Protective Measures Of Cross-Laminated Timber, Samuel Gray Shumate

Theses and Dissertations

The growing use of cross-laminated timber (CLT) in sustainable construction necessitates improved protection against biological deterioration. This study evaluates the fungal resistance of Southern Pine CLT fabricated from lumber pre-treated with micronized copper azole (MCA). Panels were produced under industrial pressing conditions, and durability was assessed using a modified American Wood Protection Association (AWPA) E10-22 soil block test against four brown-rot fungi. Results showed significant decay reduction for Coniophora puteana and Neolentinus lepideus, while protection was less effective against Gloeophyllum trabeum and Rhodonia placenta. Findings indicate that pre-treatment enhances preservative distribution but does not fully prevent decay in high-hazard environments. …

Students’ College Choice: Factors Influencing The Decision To Attend A Particular College, Miss Thompson Gordon

Theses and Dissertations

Community colleges play a vital role in expanding access to higher education by offering affordable and flexible opportunities for diverse learners, including many who face academic and socioeconomic challenges. This qualitative phenomenological study examined the factors that influence high school seniors' decisions to attend a particular college. Guided by Hossler and Gallagher's (1987) three-stage college choice model of predisposition, search, and choice, the research explored how students gather information; the influence of family, peers, and school personnel; and the importance of college characteristics such as cost, location, and campus environment. Data were collected through semi-structured interviews with ten high school …

The Role Of Math Anxiety – And Associated Support Mechanisms And Strategies – In The Academic Success Of Stem College Students, William Jacob Tschume

Theses and Dissertations

Math anxiety has been widely documented as a barrier to student success, yet its role within institutional student success frameworks – particularly in gateway STEM courses – remains underexamined. The purpose of this quantitative study was to examine the relationship between math anxiety, academic support mechanisms, and academic performance among undergraduate STEM students enrolled in a gateway mathematics course at a large, public, research-intensive university. Guided by the Debilitating Anxiety Model, student success frameworks, Social Cognitive Career Theory, and equity-oriented perspectives, this study addressed three research questions: (1) how student demographic characteristics relate to levels of math anxiety, (2) the …

Effects Of Melatonin Supplementation On Exercise Induced Stress In Horses, Hannah Clark Valigura

Theses and Dissertations

Exercise is a necessary component of athletic conditioning but imposes substantial physiological stress on horses, resulting in oxidative stress, inflammation, muscle damage, and thermal strain that can impair performance and recovery. Melatonin, a neurohormone with potent antioxidant and thermoregulatory properties, has been proposed as a novel nutritional strategy to mitigate these effects. This dissertation aimed to (1) characterize serum melatonin concentrations following oral supplementation, (2) evaluate the effects of melatonin on oxidative stress, inflammation, and muscle damage biomarkers after exercise, and (3) examine its influence on physiological parameters during exercise under warm weather conditions. Across a series of controlled experiments …

Integrating Augmented Reality Visualizations Into Data Science Notebooks Using Microsoft Hololens 2, Derek Willis

Theses and Dissertations

Data-science notebooks support iterative analysis but are limited to two-dimensional (2D) displays. This work presents an approach to extend such environments with rapid augmented reality (AR) visualization while preserving conventional 2D workflows. An opensource R package was developed to convert notebook objects into three-dimensional (3D) models, export them in the Graphics Language Transmission Format (glTF), and transfer directly to a Microsoft HoloLens 2 via a USB connection for viewing in the native 3D Viewer application. The proposed workflow eliminates manual conversion and transfer steps required by earlier methods. A user study employing a post-session questionnaire indicated that participants found the …

Feasibility-Aware Deep Reinforcement Learning For Sustainable Timber Procurement Under Hurricane Demand Uncertainty, Jarod Wright

Theses and Dissertations

The timber supply chain connects landowners and mills to provide wood products but faces challenges from stochastic demand, seasonal variations, and disruptions such as hurricanes. Fur- thermore, sustainability concerns like transportation emissions create trade-offs in procurement. This study proposes a feasibility-aware Deep Reinforcement Learning framework for sustainable timber procurement and inventory control under joint demand–hurricane uncertainty. We develop a stochastic mathematical model capturing mill-landowner interactions, seasonal demand, hurricane- driven pricing, and carbon emissions. The problem is formulated as a constrained Markov decision process and solved using Proximal Policy Optimization with a feasibility-enforcing layer. A Mississippi-based case study with 2,100 landowners …

Reconciliation: An Auditory Exploration Of Redemptive Suffering, Emily Eid

MFA in Visual Art

Reconciliation examines the intersection between chronic pain, Catholic theology, and contemporary sound art through the lens of radical honesty. It documents a dramatic aesthetic and spiritual pivot in my art practice, moving from grotesque, abject portrayals of agony to a hopeful representation of redemptive suffering. I share how the project evolved from an installation of anthropomorphic furniture to a sculptural work using my bed, to an audio piece presented in a semi-private “confessional booth,” all while challenging the misconceptions surrounding chronic pain and disability. Utilizing the theories of Roland Barthes, I break down the semiological and authorial aspects of the …

Quadriceps Tendon Versus Patellar Tendon Autograft For Primary Acl Reconstruction: A Matched-Pairs Analysis At 3, 6, And 9 Months, Grant Gueller, Steven Higbie, Walter Lowe

Summer Research Program Abstracts

No abstract provided.

Harnessing Mechanobiology Of Resident Stem Cells To Refine Cell Based Therapeutics, Dakota R. Kamm

WUSM Theses and Dissertations – All Programs

Mesenchymal stem cells (MSCs) are resident cells residing with many adult tissues such as adipose tissue and bone marrow that have the potency for multiple lineage differentiation as well as the capacity to secrete a litany of beneficial factors to maintain homeostasis and promote tissue repair. Since 1995, MSCs have been used therapeutically to treat a variety of conditions from osteoarthritis to heart disease to muscle pathologies. Great leaps have been made in improving MSC-based therapies through optimization of culture methods and select enrichment of cellular subpopulations. More recently, the physical microenvironment of tissue in vivo and culture conditions in …

Púchica! Central American Students Navigating A Community College In The Southwest, Reina Ferrufino

UNLV Theses, Dissertations, Professional Papers, and Capstones

This qualitative study centers the lived experiences of U.S. Central American students at a large community college in the Southwestern United States. Guided by Latinx Critical Race Theory (LatCrit) and Garcia’s (2023) Servingness framework, the study examines how institutional structures—including classrooms, student support services, and co-curricular spaces—shape students’ experiences of belonging, access, and recognition. Grounded in LatCrit, particularly its attention to racist nativism, the study situates students’ experiences within broader racialized and migration-related contexts. Data were collected through semi-structured interviews with eight Central American students and recent alumni. Findings reveal patterns of misrecognition, generalized understandings of Latinidad, and navigational challenges …

Constructing Imperial Connectivity: State Infrastructure Projects And The Imperial Gaze In Bengal Presidency, 1849-1856, Richard William Bradley Gaspers Iii

UNLV Theses, Dissertations, Professional Papers, and Capstones

The construction of roads, canals, and supporting infrastructure in British India connected urban environs of power to interior peripheral spaces. The conclusion of the Second Anglo-Sikh War in 1849 saw the East India Company stand alone as the paramount power over the Indian subcontinent. A century of conquest gave way to a century of internal management. This shifted the state’s ‘gaze’ inward. Public infrastructure construction skyrocketed after 1849, transforming the role of the colonial state as it built roads, canals, bridges, courthouses, police stations, and jails on an unprecedented scale. This thesis will explore how these physical constructs bolstered connectivity, …

Establishing A Comprehensive Framework For Sfrt Lattice Treatments: Optimization, Planning, And Clinical Evaluation, Gregory M. Gill

UNLV Theses, Dissertations, Professional Papers, and Capstones

Spatially fractionated radiation therapy (SFRT) using lattice radiotherapy (LRT) has emerged as a promising treatment technique for bulky, nonresectable tumors by delivering spatially heterogeneous dose distributions consisting of high-dose vertices embedded within lower-dose regions. Although early clinical experiences have demonstrated potential therapeutic benefit, widespread clinical implementation of LRT remains limited due to the absence of standardized treatment planning workflows, consistent optimization strategies, and clearly defined evaluation metrics for heterogeneous dose distributions. The objective of this study is to develop and evaluate a structured framework to support efficient, reproducible, and safe clinical implementation of LRT.

To address these challenges, a comprehensive …

Goals, Properly Technical: Special Education Teachers Using Chatgpt To Develop Individualized Student Goals, Travis Hammond

UNLV Theses, Dissertations, Professional Papers, and Capstones

Educators’ responsibilities extend well beyond instruction to include administrative duties such as grading, maintaining records, and documenting student behavior, as well as ongoing meetings and professional development requirements (Billingsley et al., 2019; Darling-Hammond et al., 2017). These demands can create a disconnect between role expectations and daily realities (Brunsting et al., 2023). Special education teachers (SETs) face these same responsibilities alongside additional paperwork requirements, which may account for up to 20% of their workday (Carlson et al., 2002; Suter & Giangreco, 2009; Vannest et al., 2011). A central task is the development of Individualized Education Programs (IEPs), including measurable annual …

A Modified Maximum Likelihood Estimation Algorithm For Modeling Threshold Exceedances With The Generalized Pareto Distribution, Jeffrey Harkness

UNLV Theses, Dissertations, Professional Papers, and Capstones

A modified maximum likelihood estimation (MLE) algorithm is proposed for modeling threshold exceedances with the generalized Pareto distribution (GPD). The algorithm addresses multiple issues with an approach originally published in the Journal Computational Statistics and Data Analysis (Castillo and Serra, 2015). The modified algorithm is intended to be comparatively simple to understand and implement, accurate in the handling of boundary conditions, relatively fast and reliable for most data sets, and relatively easy to transfer between computer languages by leveraging existing optimization routines.

A reproducibility study of work in recent literature published in the journal Extremes (Belzile, et al., 2023) is …

"Home Means Nevada": Latinx Belonging In A New Destination, Maria G. Hermosillo

UNLV Theses, Dissertations, Professional Papers, and Capstones

This project examines how Latinx individuals construct meanings of home and belonging in a Southern Nevada micropolitan city. Nevada is considered a new “Hispanic settlement state” and “New Immigrant Destination” as the state has experienced significant Latinx population growth since the 1990s. This research addresses an empirical gap by centering Nevada in understanding Latinxs lived experiences through the taken-for-granted concept of “home” and a theoretical gap by advancing New Destinations research where moral order, economy, and region influence ethnic incorporation.

Drawing on 32 in-depth semi-structured interviews with current and former Latinx residents and supplemented by participant observation, the study analyzes …

The Exploration Of Leisure Occupations For Older Adults, Chloe Jisoo Kang

UNLV Theses, Dissertations, Professional Papers, and Capstones

Introduction: This capstone project involved the development and implementation of a community-based program for the exploration of leisure occupations for older adults. The program aimed to increase the life satisfaction and occupational balance of participants. A manualized program was created for the capstone site for potential continuation of the program.

Methods: The program was developed with the support of evidence-based research and the Occupational Therapy Practice Framework (OTPF-4). Two-hour events were held once a week for four weeks in a community area of the senior living community. A modified version of the Occupational Balance Questionnaire (OBQ11) and the Satisfaction with …

A Tale Of Two Mammals: Tenrec Ecaudatus And Homo Sapiens, Debra Renee Kerr

UNLV Theses, Dissertations, Professional Papers, and Capstones

Most modern mammals maintain stable body temperatures (Tb) ~37ºC and high metabolic rates. Hibernators, like ground squirrels, are homeothermic during the active summer season, but are heterothermic during the hibernation season. During the hibernation season, ground squirrels follow a predictable pattern of torpor bouts interrupted by interbout arousals. Tenrecs are unusual because they are heterothermic and heterometabolic even during the active season. Previously, ground squirrel bile constituents were shown to be predictive of whether a squirrel is in the summer active or winter hibernation season. We found tenrec bile constituents were highly variable and not predictive of seasonal and metabolic …

Developing A Health Education Program For Adults Reentering The Community After Incarceration, Tiffany Ayame Kinugawa-Larsen

UNLV Theses, Dissertations, Professional Papers, and Capstones

Justice-impacted adults often experience challenges in confidently managing their health due to limited autonomy, disrupted health routines, and limited access to health education during incarceration. Studies have shown that incarcerated adults have a higher likelihood of developing chronic health issues, yet have limited access to resources that promote health and well-being after release from incarceration. Given that health management falls within the scope of occupational therapy (OT), the profession is positioned to promote health and well-being by applying OT principles that emphasize individualized, holistic care tailored to a justice-impacted population during community reintegration. A 5-week health education program grounded in …

An Optimization Method For Near-Linear Phase Analog Frequency Sampling Filter Design, Leonardo Ledesma

UNLV Theses, Dissertations, Professional Papers, and Capstones

Analog frequency sampling filters (FSFs) realize a desired frequency response by interpolating a frequency response through a set of harmonically related frequency samples from the filter’s frequency response and are magnitude and phase coefficients used in the filters transfer function. FSFs can be designed to have exact linear phase which makes the FSF attractive for many applications. A FSF’s system transfer function (STF) shows that the filter can be implemented by a series connection of a comb filter and a parallel array of resonators. However, the FSF requires that the zeros created by the comb filter cancel the imaginary axis …

Iterative Silver-Label Refinement For Temporal Information Extraction In Biomedical Literature, Chan Lee

UNLV Theses, Dissertations, Professional Papers, and Capstones

Temporal information extraction plays a critical role in the biomedical domain, where the ability to identify events and their temporal relationships is central to interpreting research findings. However, annotated corpora for this task remain scarce and costly to produce and the existing models developed for clinical text do not transfer well. This work bridges that gap through iterative silver-label refinement. A temporal model originally trained on news-domain data is adapted to biomedical text through cycles of automatic labeling, targeted correction, and retraining without the need for comprehensive manual annotation.

Key contributions include a practical iterative refinement methodology demonstrating that the …

Impairment And Disability In Mesoamerica: Bioarchaeological Evaluation And Interpretation Of The Maya Of Palenque, Dayanira Lopez

UNLV Theses, Dissertations, Professional Papers, and Capstones

The application of disability theory to the past is of growing interest among bioarchaeologists, both nationally and internationally. However, its application poses greater challenges when considering ancient contexts, such as Mesoamerica. Nonetheless, engagement with disability studies has led to the development of various theoretical frameworks in bioarchaeology, including dis/ability. This model views physical impairment as a fluid state that may exhibit adaptability and resilience rather than a biological deficit. Importantly, it views ability on a spectrum and does not make assumptions about social and cultural perceptions of ability where there is a lack of contextual data. Thus, it is a …

Exploring The Impacts Of Contextualized Learning In An Engineering-Specific Corequisite Precalculus Course On Student Achievement, Motivation, And Belongingness, Amy Mathis-Leonard

UNLV Theses, Dissertations, Professional Papers, and Capstones

This study examines the design and implementation of a contextualized engineering-specific corequisite Precalculus I course and its impacts on student achievement, motivation, and sense of belonging. This study was conducted in response to decreasing national rates of mathematical readiness, the elimination of stand-alone developmental mathematics courses across multiple states and systems, and the demand for research related to effective corequisite models in mathematics coursework. The intervention created an experimental section of corequisite Precalculus I in which all the students were engineering majors who did not demonstrate readiness for a college-level precalculus course. Unit lessons incorporated engineering-specific topics and career-oriented discussions. …

Supporting Staff Social-Emotional Learning Through An After-School Program, Alexis Monique Molina

UNLV Theses, Dissertations, Professional Papers, and Capstones

This doctoral capstone project aimed to develop and implement an occupational therapy- informed social-emotional learning (SEL) training program for after-school staff at the Hollywood Recreation Center in Las Vegas, Nevada. The project addressed a critical gap in the skills and competence of staff needed to manage emotional and behavioral challenges in community-based youth programs. Guided by the Person-Environment-Occupation (PEO) model, adult learning theory, and the Collaborative for Academic, Social, and Emotional Learning (CASEL) framework, the fourteen-week program incorporated weekly lessons to enhance self-awareness, emotional regulation, and relational competence among staff. Through interactive lessons, reflection promotion, and feedback surveys, participants engaged …

Addressing Sleep Health In The Fire Service: A Sleep Hygiene Education Program, Alyssa Elizabeth Neal

UNLV Theses, Dissertations, Professional Papers, and Capstones

This capstone project implemented an occupational therapy sleep hygiene program tailored to the unique occupational demands of Las Vegas Fire and Rescue (LVFR) firefighters. Guided by the Occupational Adaptation theory and the CALMS Framework, this project conceptualized sleep as a meaningful occupation essential to health, safety, and functional performance. The project’s aim was to assess the feasibility of a sleep hygiene program designed for the fire service using standardized measures, including the Sleep Hygiene Index. The methodology incorporated a structured educational session focused on educating firefighters on the importance of sleep, modifying routines and environments to support restorative sleep, implementing …

Sense Of Belonging And Professional Identity In Acute Care Occupational Therapists: A Phenomenological Study, Shania Marion D. Novilla

UNLV Theses, Dissertations, Professional Papers, and Capstones

Occupational therapy practitioners (OTPs) play a crucial and demanding role in acute care, addressing complex diagnoses and facilitating safe discharge; however, the fast-paced biomedical environment often pressures them to compromise their occupation-based philosophy, potentially leading to professional burnout and low retention rates. Although professional identity (the self-perception of one's role) and a sense of belonging (feeling valued and connected) are recognized as correlated concepts vital for professional resilience, this relationship remains critically underexplored within the acute care OT population. Guided by the Occupational Adaptation Model (Schkade & Schultz, 1992), this qualitative study explores how experienced occupational therapists working in an …

Skin Of Frog And Scale Of Dragon: Nutritional Cues, Life Cycle Kinetics, And Secretome Dynamics In Batrachochytrium Dendrobatidis, Naomi C. Okada

UNLV Theses, Dissertations, Professional Papers, and Capstones

Nearly 50% of amphibian species are at risk of extinction, making them the most threatened group of vertebrates on the planet. A major driver of these declines is the pathogenic chytrid fungus Batrachochytrium dendrobatidis (Bd), which causes the fatal skin disease chytridiomycosis. Since its discovery in the late 1990s, Bd has been directly implicated in the extinction of 90 species of amphibians and the declines of hundreds more. Despite this devastating ecological impact, relatively little is known about its basic cellular biology.

Bd has a multi-stage asexual life cycle consisting of a motile and infectious zoospore, which encysts (into a …

Thermal Physiological Ecology Of The Relict Leopard Frog At Hot And Cold Springs, Robert P. Pelletier Iii

UNLV Theses, Dissertations, Professional Papers, and Capstones

The relict leopard frog (Rana onca) once ranged across drainages in southern Nevada, northwestern Arizona, and southwestern Utah. Following a decline, the species only persisted in a few geothermally influenced hot springs, which led to the perspective that hot springs were high-quality habitat. Rana onca has been under intensive, multiagency management and the species has been translocated to establish additional populations, including at cold-water sites. Three research studies are presented into the thermal physiological ecology of R. onca with the aim of informing conservation strategy. The research was focused at a thermally influenced hot spring and a cold-water spring to …