Digital Commons Network^™

Automated Spectrum Analysis And Radionuclide Identification For Robot-Based Gamma Probes, Kennedy Ochieng Mengoh Alila

UNLV Theses, Dissertations, Professional Papers, and Capstones

Gamma spectroscopy is a technique used for the detection and identification of nuclear materials. Gamma-ray emission by radio nuclides is detected using scintillation detectors or semiconductor detectors such as NaI and CZT. Robot-based gamma probes enable radiation measurements in large areas and hard-to-reach cluttered hazardous environments, which significantly reduces radiation risks to personnel. The robotic probes require automated on-board gamma spectrum analysis and capabilities with platforms (unmanned aerial vehicles and unmanned ground vehicle systems) which use Robot Operating System (ROS). The aim of this thesis was to develop a method of an automated spectral analysis and isotope identification for robot-based …

Ultrafast Dynamics Of Two-Dimensional Electron Systems, Randy Michael Sterbentz

UNLV Theses, Dissertations, Professional Papers, and Capstones

On-chip terahertz time-domain spectroscopy (THz-TDS) is a technique useful for measuring the ultrafast electrodynamics of two-dimensional (2D) electronic systems. Charge carrier collisions occur on the sub-picosecond time scale, and strongly correlated electron interactions (such as superconductivity) typically have energies on the order of milli-electron-volts. These phenomena fall within the terahertz bandwidth, which has historically been difficult to access. Commercial electronics operate with transistors capable of switching rates of around 100 GHz, while small band gap semiconductors (like InGaAs) can detect light down to 0.75 eV (180 THz). When combined with the difficulty of measuring 2D layered materials, with lateral sizes …

A Phenomenological Study Of The Experiences Of Adolescents With Emotional Behavioral Disorders In High School, Melissa Lawson

UNLV Theses, Dissertations, Professional Papers, and Capstones

Adolescents with emotional and behavioral disorders (EBD) face significant challenges in forming and maintaining peer relationships, yet their voices and lived experiences remain largely absent from the research literature. This phenomenological study explored how high school students with EBD perceive the impact of peer relationships on their academic, social, and emotional experiences at school. Using Moustakas's (1994) modification of the StevickColaizzi-Keen method, the researcher conducted in-depth semi-structured interviews with seven high school students (ages 15-18) who had received special education services under the EBD eligibility category for 5 to 10 years in a large, urban southwestern school district.

Five universal …

Perceptions And Behaviors Of Female Title I Principals And Faculty Trust In The Post-Covid-19 Educational Environment, Jessica A. Robbins

UNLV Theses, Dissertations, Professional Papers, and Capstones

Faculty trust in principals is essential to a healthy school culture, yet it remains one of the most fragile and complex aspects of leadership, particularly in Title I schools (Tschannen-Moran, 2007, 2014; Tschannen-Moran et al., 2015). While trust has been widely studied, fewer investigations have focused on the specific behaviors female principals use to build trust in the post-COVID era (Berkovich, 2018; Bukko et al., 2021; Handford & Leithwood, 2013; Jeanquart-Barone, 2013; Zajda et al., 2023; Zheng et al., 2021). Research suggests that women in leadership must be deliberate in fostering trust, yet their behaviors are often judged more harshly …

Face Recognition Ability: The Role Of Facial Experience Across The Lifespan, Kirsty Kulhanek

UNLV Theses, Dissertations, Professional Papers, and Capstones

The other-race effect is a phenomenon in which individuals are better able to recognize individuals of their own race than individuals of another race. These effects begin to develop during the first year of life and may be attenuated by intergroup contact. Limited research in the language domain has suggested that multilingualism may result in easier learning of non-native speech contrasts, so it is of interest whether early experience with racially diverse faces may result in more easily learning to recognize unfamiliar race faces. We conducted two studies to examine the effects of early diverse experience with faces on recognition …

Integrating Classical Singing Techniques To Aid Natives In Performing Traditional Tongan Folk Songs Of The Late Queen Sālote Tupou Iii, Pauline 'Ofa Vaitāfā Tamale

UNLV Theses, Dissertations, Professional Papers, and Capstones

This document introduces a structured, classical vocal approach to equip native singers with healthier performance techniques and enable anyone in the music world to perform the art songs derived from the poetry and compositions of Queen Sālote Tupou III. The objective of this project is to provide performers, particularly those with a native proficiency, with classical techniques to perform this music with vigor while circumventing vocal fatigue caused by the linguistic, dialectal, and cultural demands inherent in the repertoire. Queen Sālote Tupou III (1900–1965) reigned for nearly 50 years – the longest of any Tongan monarch – and left an …

Assessing The Relationship Between Treatment Quality, Matching And Dosage And Juvenile Justice Outcomes Among Youth With Co-Occurring Substance Abuse And Mental Health Disorders, Kevin T. Wolff, Michael T. Baglivio, Joshua A. Lang

Publications and Research

This study examined differences among youth in deep-end juvenile justice residential placement who did, and did not, present with co-occurring disorders. The prevalence of cooccurring mental health and substance use/abuse issues was found to be 19%, far lower than that of prior work. Researchers demonstrated more similarities than differences between youth with and without co-occurring disorders, both in terms of their criminal histories and the prevalence of their criminogenic needs. Additionally, the residential programs across Florida appear to provide treatment at similarly high levels of integrity, as measured by 1) matching treatment services to the highest three dynamic risk assessed …

Objective Vs. Perceived Maternal Smartphone Use And Observed Mother-Infant Interaction Quality, Alison K. Ventura, Lara N. Wolfers, Sarah M. Coyne, Rachel Pfafman, Sabrina Uva, Karla I. Ceja Almontes, Aniruddha S. Shinde, Adam M. Galovan, Brandon Mcdaniel

Health Services and Informatics Research

Introduction:

Prior research links maternal smartphone use to reduced sensitivity and responsiveness to infant cues, but emerging evidence suggests that mothers' perceptions of their smartphone use - such as feelings of empowerment or distress - may also shape the quality of mother-infant interactions. This study examined how both objective and perceived smartphone use related to mother-infant interaction quality in naturalistic settings.

Method:

Participants were 147 mother-infant dyads from a longitudinal study of smartphone use and infant development. When infants were 2 months old, mothers completed 5 days of ecological momentary assessment (EMA), reporting time spent with their infant, perceived smartphone-related …

The Cost Of Care: Medical Bills, Mental Health, And The Protective Role Of Insurance Coverage Among U.S. Adults, Fahima Sultana

Electronic Theses and Dissertations Archive

This paper focuses on how medical bills and financial hardship are related to healthcare access in adults in the United States, based on the results of the National Health Interview Survey (NHIS). In particular, it examines the hypothesis that those with problems paying medical bills have a higher tendency to delay or ration medical care or health insurance cover offsets this effect. Logistic regression models were used to determine the relationship between financial hardship, delayed care, and psychological distress and demographic and socioeconomic variables including age, education, race, and poverty status. According to the results, it can be seen that …

Information Management / Bim Technology Deployment Plan, Robert Moore

Tools

This technology deployment plan sets out the practical steps required to implement and operationalise selected Information Management and BIM (BIM) technologies. It defines activities, responsibilities, sequencing, and dependencies to ensure systems are configured, tested, and adopted in a controlled and coordinated manner. The plan supports effective change management, training, and transition to business-as-usual use, reducing risk and disruption. Overall, it provides a clear, actionable framework for moving from technology selection to consistent, reliable use that supports standards-aligned Information Management / BIM delivery.

Level Of Confidence In The Writing Performance Of Arabic Language Students At King Khalid University, Mahmoud Helal Abdel Baset Abdel Kader

Alustath Journal for Human and Social Sciences

The aim of the current research is to identify the degree of confidence in the written performance of Arabic language students at King Khalid University in the Kingdom of Saudi Arabia. To achieve this goal, the researcher used the descriptive method. Due to its suitability to the nature of the current research and its goal, the researcher then prepared the necessary tools to achieve the goal of the research. These tools were: a measure of confidence in the appropriate written performance of students of the Arabic language at a university. Then the researcher sought to ensure the stability and validity …

Suicidal Intentions Among Divorced Women In Wasit Province, Khitam Abbas Fadhel, Hassan Aii Ai-Sayed

Alustath Journal for Human and Social Sciences

The current research aims to: Identifying Suicidal Intentions Among Divorced Women Marriage is viewed as a social institution that includes a set of norms regulating the relationship between spouses. The strength of this structure relies on solid foundations such as proper selection and compatibility in social aspects. Marriage imposes on spouses a set of mutual obligations and rights ensuring the continuity of marital life and enabling the family to fulfill its basic functions Despite the psychological, health and social significance marriage, offers to individuals and society, the phenomenon of divorce has been increasingly prevalent in recent times across various communities …

What’S In A Group: A Social Science Inquiry, Maria Caridad H. Tarroja

Asia-Pacific Social Science Review

No abstract provided.

The Economics Of Homelessness: A Quantitative Study On Homeless Willingness To Pay For Affordable Housing In Thailand, Peera Tangtammaruk, Nattapon Siwareepan, Jennifer Chavanovanich, Nartsupon Dumchuen, Thanee Chaiwat, Mattana Wongsirikajorn

Asia-Pacific Social Science Review

This study investigates the willingness to pay (WTP) for housing among homeless individuals in Thailand, using the contingent valuation method (CVM) and a structured choice experiment model. Data were collected through face-to-face interviews with 90 homeless individuals from Bangkok, Chiang Mai, and Khon Kaen. The study aims to understand the economic value that homeless individuals are willing to pay for various types of homelessness-related housing, as well as the factors influencing their WTP. The findings reveal that while most homeless individuals express a preference for affordable rental housing, their financial capacity remains limited due to low and unstable incomes. The …

Leveraging Social Capital For Value Creation In Public Procurement: The Role Of Strategic Purchasing Integration, Iryna Malacina, Jad El Bizri, Frederik G. S. Vos, Elina Karttunen, Aki Jaaskelainen

Business Faculty Publications and Presentations

Purpose Although the integration of the purchasing function within strategic decision-making has been extensively studied in the context of the private sector, its significance for the effective functioning of public procurement (PP) remains underexplored. Effective PP is critical for suppliers, users of public services and society at large. This study investigates how the strategic integration of PP influences operational, environmental and innovative value creation by developing social capital in buyer–supplier relationships. Design/methodology/approach This study empirically examined how strategic purchasing integration contributes to the development of social capital in buyer–supplier relationships, which in turn affects value creation. It utilizes survey data …

Extracellular Matrix-Mycaf Signatures Correlate With Resistance To Neoadjuvant Apd-L1 Immune Checkpoint Inhibition With Durvalumab + Metformin In Hpv+ Hnscc, Pablo Llerena, Hani Samarah, Kathryn Nunes, Zhao Lin, Kelly Bridgham, Sruti Tekumalla, Amiti Jain, Larry A. Harshyne, Sanket Kumar Shukla, Ioannis Vathiotis, Madalina Tuluc, Stacey Gargano, John R. Eisenbrey, Scott W Keith, David Cognetti, Voichita Bar-Ad, Adam J. Luginbuhl, Rita S. Axelrod, Rajanikanth Vadigepalli, Hushan Yang, Diana Whitaker-Menezes, Megan Roche, My G. Mahoney, Athanassios Argiris, Charalambos C. Solomides, Jennifer Johnson, Md, Mouadh Barbirou, Amanda Miller, Andrew P. South, Ramkrishna Mitra, Alban J Linnenbach, Ubaldo E. Martinez-Outshoorn, Joseph Curry

Department of Otolaryngology - Head and Neck Surgery Faculty Papers

PURPOSE: Immune checkpoint inhibitors (ICI) have demonstrated clinical benefit in head and neck squamous cell carcinoma (HNSCC); however, single-agent efficacy is limited, leaving significant unmet needs. Metformin may synergize with ICIs, offering promise to improve response rates. We leveraged multiomic data from a randomized, presurgical neoadjuvant trial (NCT03618654) evaluating a single infusion of the anti-PD-L1 ICI durvalumab with or without daily, standard dose metformin in previously untreated, nondiabetic patients with HNSCC to understand predictors of response and the effect of combination therapy.

PATIENTS AND METHODS: Clinical, pathologic, and correlative data were analyzed to investigate response and resistance mechanisms. We present …

Enhancing Exercise Engagement And Gait In Parkinson Disease: Participation Factors, Novel Approaches, And The Role Of Rhythmic Auditory Cueing, Allison Haussler

WUSM Theses and Dissertations – All Programs

Parkinson disease (PD) is the second most common neurodegenerative disease, characterized by gait and balance impairments that reduce independence and diminish quality of life. Exercise and other rehabilitation strategies, such as rhythmic auditory cueing, are well-researched methods to address motor impairments. However, despite the strong body of research supporting these approaches, many individuals with PD remain sedentary and do not meet current exercise recommendations. This highlights a critical gap between evidence and real-world behavior.

While prior research identified general motivators and barriers to exercise in people with PD, emerging exercise modalities and the growing diversity of community-based programs emphasize the …

Shallow Groundwater Extraction Strategies In The Las Vegas Valley, Nevada, Teryl Stacey

UNLV Theses, Dissertations, Professional Papers, and Capstones

The Las Vegas Valley faces severe water scarcity due to Nevada’s limited Colorado River allocation and an arid climate. Population growth and prolonged drought have intensified these constraints, necessitating alternative resource strategies. This project evaluated a strategy to make use of brackish, shallow groundwater (from the top 30 feet below ground surface) located in the central and east-central parts of the valley. Its objective was to extract lower quality shallow groundwater for use as an alternative to fresh water currently being used for some applications that require little to no treatment. Dust suppression is among the most promising of such …

Beyond Additive Risk: Longitudinal Associations Between Discrimination And Positive Affect Development Among Adolescents With Single And Multiple Marginalized Identities, Vanni Jefferson V. Arcaina

UNLV Theses, Dissertations, Professional Papers, and Capstones

Adolescents with marginalized identities often face chronic exposure to discrimination, a social stressor linked to a range of negative mental health outcomes. While much of the existing literature focuses on internalizing symptoms, fewer studies have explored how discrimination may disrupt the development of positive affect (POA), which is a core dimension of emotional well-being linked to resilience, identity formation, and long-term health. The present study examined how overall, race/ethnicity-based, and sexual minority (SM)-based discrimination affects longitudinal patterns of POA among adolescents with single or multiple marginalized identities. Drawing on four waves of data from the Adolescent Brain Cognitive Development Study, …

Unseen, Unbroken: Black Women In Educational Leadership Overcoming Inequities, Microaggressions, And Invisibility, Inspiring Perseverance And Resilience In Future Black Women Leaders, Angella Baldwin

UNLV Theses, Dissertations, Professional Papers, and Capstones

This study explored the challenges that Black women face when pursuing leadership roles in K–12 education, specifically in middle schools. Despite being prepared and eager to lead, Black women are often overlooked and made to feel invisible. Still, we persevere, navigating barriers with determination, faith, and purpose, and continue to support those who follow. Guided by Black Feminist Thought, Endarkened Feminism, and Structural Intersectionality, this study centers Black women’s lived experiences as valid sources of knowledge. It highlights how leadership is shaped by overlapping systems of oppression and resistance, and how it is sustained by prayer, faith in God, and …

Mapping Climatic And Environmental Determinants Of Parasitic Helminth Prevalence In Southeast Asia, Angelica Avisado

UNLV Theses, Dissertations, Professional Papers, and Capstones

Climate change is reshaping environmental conditions across Southeast Asia (SEA) through rising temperatures, altered precipitation patterns, and increased droughts. These changes alter transmission dynamics of neglected tropical diseases (NTDs) by shifting spatial distribution, increasing larval development rates, faster pathogen growth development, and increasing transmission rates. NTDs are a group of preventable and treatable infections that disproportionately affect more than 1 billion people globally, specifically in tropical and subtropical regions. A subgroup of NTDs, parasitic helminth infections (PHIs) - particularly schistosomiasis, soil-transmitted helminths, and lymphatic filariasis remains a public health concern in the Southeast Asian region. PHIs and their ecological responses …

Comparative Study Of Vocal Pedagogy Systems In South Korea And The United States: Developmental Strategies For Classical Voice Education In South Korea, Dongmin Byeon

UNLV Theses, Dissertations, Professional Papers, and Capstones

This dissertation presents a comparative study of vocal pedagogy systems in South Korea and the United States, with the aim of identifying deficiencies in Korean higher education and proposing strategies for reform. While South Korean university voice programs are deeply rooted in the traditional master–apprentice model and rely heavily on anecdotal teaching methods, U.S. institutions have developed structured, evidence-based pedagogical frameworks informed by anatomy, physiology, acoustics, and voice science. This research explores the historical evolution of vocal pedagogy in both countries, highlighting how traditional practices in Korea, though culturally significant, have not sufficiently adapted to contemporary scientific standards.

Employing qualitative …

Examining Religiosity, Suicidality, And Internalized Homonegativity Among Ethnoracially Diverse Sexual Minority Students, Danica Christy

UNLV Theses, Dissertations, Professional Papers, and Capstones

Sexual minority (SM) individuals are at an elevated risk for suicidality, particularly those who hold multiple marginalized identities, including religious and racial minority statuses. While religiosity is generally protective against psychological distress and suicide for heterosexual individuals, its impact on SM individuals is more complex. It may function as both a risk and a protective factor. The current mixed methods study explored the relationships between religiosity, internalized homonegativity (IH), and suicidality among an ethno-racially diverse sample of college students (n = 246). Quantitative analyses revealed that SM participants (n = 123) reported significantly higher rates of suicidality than their heterosexual …

Towards Spatial Inversion Of Aerial Gamma-Ray Survey Data For Measurement Of Naturally Occurring Radioactivity, Daniel A. Haber

UNLV Theses, Dissertations, Professional Papers, and Capstones

Aerial gamma-ray surveying (AGRS) is used in geologic and environmental contexts to provide data on the surface spatial distribution of naturally occurring radioactive material (NORM) or other gamma-ray-emitting isotopes. The standard data reduction workflow for AGRS data involves a process whereby pointwise gamma-ray spectral data are denoised, corrected for numerous sources of background radiation and aircraft height, and are finally converted to physical values by empirical conversion factors. The reduced pointwise data are then typically spatially interpolated to form a continuous surface map.

This dissertation introduces and explores a novel spatial inversion method for reduced AGRS data that considers aircraft …

Applying Instrumental Neutron Activation Analysis (Inaa) To Characterize Trace Elements In Water Samples Around Lake Mead, Danesha Hunter

UNLV Theses, Dissertations, Professional Papers, and Capstones

Lake Mead, the largest reservoir in the United States is located on the boarder of Nevada and Arizona. Despite reaching historically low water levels, it continues to supply water and energy to millions of Americans in the southwest. It is well known that the United States suffers from negative implications from nationwide drought. The ongoing megadrought affecting the Colorado River Basin and its tributaries undergoes the urgent need to assess the future water quality of Lake Mead as it continues to shrink. With water levels depleting at an alarming rate, water quality is significantly impacted, indicating that heavy metal accumulation …

Transforming Fear Of Falling Care: Bridging Evidence Synthesis And Clinical Trial On Cognitive Behavioral Therapy-Based Multicomponent Interventions For Older Adults, Haehyun Lee

UNLV Theses, Dissertations, Professional Papers, and Capstones

Introduction: Fear of falling (FoF) and associated avoidance behavior represent critical health concerns for older adults, with profound impacts on physical functioning, independence, psychosocial well-being, and healthcare utilization. Although fear of falling avoidance behavior (FFAB) is increasingly recognized as a distinct construct and clinically meaningful construct, intervention research remains limited due to fragmented assessment methodologies and incomplete integration of cognitive-behavioral and physical approaches. This dissertation addresses these gaps through two interrelated projects (1) a scoping review of the evidence base, assessment methods, and intervention strategies for Cognitive Behavioral Therapy (CBT) targeting FFAB in older adults; and (2) a randomized controlled …

Computational Study Of Cavitation In An Inducer Pump, Jaylen Leonard

UNLV Theses, Dissertations, Professional Papers, and Capstones

Cavitation is ubiquitous in liquid-handling turbomachines. Cavitation bubbles form when the local pressure drops below a fluid’s vapor pressure, and their subsequent collapse causes implosions that generate shockwaves and microjets. These effects lead to fluid instability and structural damage to the blades and casing in turbomachines. This thesis investigates this cavitation phenomenon in turbomachines using Computational Fluid Dynamics (CFD). The cavitation model built in ANSYS Fluent® is first validated in a venturi tube model and then applied to an inducer pump. The geometry of the pump is derived from the Space Shuttle Main Engine (SSME) Low Pressure Oxidizer Pump (LPOP) …

A Case Study Of The Implementation Of Nevada’S Program To Reduce Recidivism Of The State’S Female Prison Population, Lisa C. Levine

UNLV Theses, Dissertations, Professional Papers, and Capstones

Success in public administration is often defined by long-term goals that demonstrate how effective a program or policy is. These long-term goals can take years to measure leading to investment doubts, shifting stakeholder goals, and the sunsetting of programs. There is a need to better understand how short-term and intermediate outcomes of a program can be used to measure success and the role goal orientation of stakeholders play in the implementation. Prison education programming exemplifies this problem as reducing recidivism, a leading goal for these types of programs, take a lifetime to prove. This study examines a female prison education …

Geometric And Proximity Based Substrate Targeting By Cullin-Ring Ligases, Jerry Li

UNLV Theses, Dissertations, Professional Papers, and Capstones

Homeostasis, the process of maintaining stable biochemical and biophysical conditions, is a fundamental facet of cellular viability. Biochemical homeostasis is critical to support the biological functions that sustain living organisms. Protein ubiquitylation is one of the primary cellular pathways that regulate protein homeostasis and turnover. Ubiquitylation is initiated through the conjugation of a small globular protein known as ubiquitin, onto a given substrate. There exists a myriad of cellular fates that ubiquitylated proteins may undergo, but the most widely studied pathway is protein degradation, whereby a ubiquitylated protein substrate is shunted to a large macromolecular protease known as the proteasome, …

Gaming: An Untapped Resource For Women In Computer Science Careers?, Claudia Quynh Luu

UNLV Theses, Dissertations, Professional Papers, and Capstones

This research focused on women who identify as gamers (i.e., an individual who regularly plays video games) with the goal of better understanding how being a gamer might help or hinder women’s interest in computer science careers. In particular, I examined the connection between interest in computer science careers, gaming, sexual harassment experiences, coping strategies, and allyship for women in gaming using a mixed-methods approach. The sample (N = 166) included women identifying as previous or current gamers. Participants were recruited from a psychology participant pool and gaming communities on Discord. We conducted a series of analyses to examine whether …