Digital Commons Network^™

The Impact Of Interactive Digital Tools On Students’ Engagement And Learning Outcomes In Economics, Ashram Ramgarib

Theses and Dissertations

This study examined how the integration of digital tools in a constructivist framework improved student learning outcomes and learning engagement in the 12th-grade economics class. The quasi-experimental design was used. Sixty participants took part in the study. Five research questions guided the study. Data collection involved administering a pretest, a posttest, and a survey questionnaire. However, the survey questionnaire was administered only to the quasi-experimental group. Data analysis included calculating percentages, means, standard deviations, t-tests, correlations, and ANOVA. The findings showed that the quasi-experimental group outperformed the control group. The results revealed that 63% of the students in the quasi-experimental …

Integration Of Artificial Intelligence And Extended Reality: Process, Implementation, Assessment, And Adoption, Amirarash Kashef

Theses and Dissertations

The integration of Artificial Intelligence (AI) and Extended Reality (XR) represents a transformative frontier in human–computer interaction, offering the potential for adaptive, intelligent, and immersive systems. Despite recent advances, the mechanisms of effective AI-XR integration, methods for practical implementation, approaches for systematic assessment, and pathways for adoption remain underexplored. This dissertation addresses these gaps by developing a conceptual framework for AI-XR integration and validating it through applied studies across safety, healthcare, and behavioral domains. The work establishes a taxonomy of AI algorithms, XR modalities, and sensor ecosystems. Empirical evaluations demonstrate the feasibility and effectiveness of AI-XR systems, including real-time monitoring …

Sustainability Challenges And Opportunities In A University Police Fleet: A Case Study Of Idling, Emissions, And Electrification Potential, Van Slusser

School of Political Science, Public Affairs, Legal and Security Studies Faculty Publications

This case study examines fleet sustainability challenges within the University of Texas Rio Grande Valley Police Department, a multicampus public safety agency operating aging gasoline vehicles central to daily patrol and administrative functions. Rising maintenance costs, increased vehicle downtime, and extensive idling created both operational strain and avoidable environmental impacts. Aging internal-combustion vehicles contributed to elevated emissions and fuel consumption, particularly under high-heat conditions and equipment demands typical of campus policing. Telematics monitoring indicated that approximately 48% of total engine-on time consisted of idling, highlighting a substantial source of avoidable fuel use and emissions. The study employed a qualitative case …

Clinical Practice Guideline For Fall Prevention And Reduction, Wendy Zitzloff

Walden Dissertations and Doctoral Studies

Falls are a significant concern for residents in long-term care facilities who are 65 years old or older, which places them at a higher risk of injury. The risk of falling is unique to each patient and cumulative with advanced age and complex comorbidities. A Long-Term Care (LTC) Facility in Minnesota had 6.6% of long-stay residents experience a fall resulting in a major injury, higher than the Minnesota average of 4.1%. This Clinical Practice Guideline (CPG) outlines foundational components for preventing and reducing falls among geriatric patients in long-term care facilities. The purpose of the CPG is to outline the …

Underrepresented Students’ Perceptions Of Precollege Programs And Challenges Of Transitioning To Postsecondary Education, Dana Truesdale

Walden Dissertations and Doctoral Studies

The problem that was addressed through this study is that underrepresented students (low-income and first generation college students) face challenges associated with the transition from secondary education to postsecondary education. Grounded in Schlossberg’s transition theory, the purpose of this study was to explore underrepresented students’ perceptions of support provided by precollege programs and remaining challenges when transitioning to higher education. For this basic qualitative design, semistructured interviews with 11 underrepresented students who participated in a precollege program were conducted. Braun and Clarke’s six-phase data analysis was used. After deductive and inductive analysis, the following themes emerged: Students indicated that the …

Patient-Reported Outcomes Of Effectiveness Of Esketamine For Treatment-Resistant Depression, Erica L. Marino

Walden Dissertations and Doctoral Studies

Treatment-resistant depression (TRD) affects approximately 30% of individuals with major depressive disorder who do not respond to conventional antidepressant therapies. TRD symptoms severely impact a patient’s quality of life (QoL) and impose a considerable burden on healthcare systems. The purpose of this quantitative study was to evaluate the impact of esketamine in decreasing depressive symptoms and improving QoL factors in patients diagnosed with TRD. The research aimed to determine whether there were statistically significant improvements in depressive symptoms, as measured by the Patient Health Questionnaire-9, and changes in QoL, as measured by the Quality of Life in Depression Scale, over …

Staff Education To Improve Hypertension Management Knowledge, Angelor Eliscard

Walden Dissertations and Doctoral Studies

In this Doctor of Nursing Practice (DNP) staff education project, I addressed inconsistent staff knowledge of evidence-based strategies for preventing and controlling hypertension among African American women in an outpatient primary care setting. The practice-focused question was: In an outpatient clinical setting, what was the impact of an evidence-based staff education program on healthcare providers' knowledge of hypertension prevention and control strategies for African American women, as measured by pretest and posttest scores? The purpose of this project was to implement and evaluate a structured staff education program to improve providers' knowledge of evidence-based strategies for preventing and controlling hypertension …

Managerial Strategies For Increasing The Engagement And Retention Of Retail Employees, Dorothy Kelly Williams

Walden Dissertations and Doctoral Studies

A lack of employee engagement strategies to increase worker retention is a concern for managers in the retail industry. This problem is important because without such strategies, organizations may experience turnover, which undermines operational stability, customer experience, and profitability. Grounded in employee engagement theory, the purpose of this qualitative pragmatic inquiry was to identify and explore effective employee engagement strategies that retail managers use to increase employee retention. Participants were six retail managers in the southern United States, each with at least 3 years of experience managing employees. Data sources consisted of semistructured interviews, public documents, and related studies. Thematic …

The Impact Of Scar Wires On Dose Distribution Of Electron Fields, Ahmad Nour

Masters Projects

Purpose: This phantom study looked at whether changing the Hounsfield unit (HU) value for radiopaque scar wires in Eclipse changed the calculated electron dose distribution. Methods and Materials: Radiopaque wires were placed in the same abdominal area on an anthropomorphic phantom. The wires were set up in a circle. The CT images were brought into Eclipse, the wires were contoured, and the planning target volume was made 1 cm inside the circle of wire. For every wire size and electron energy, two matching plans were made: one plan with no density override and one plan with a density override applied …

Cone Vs. Volumetric Modulated Arc Therapy (Vmat) Stereotactic Radiosurgery (Srs) Planning For Multiple (7) Brain Targets: Dosimetric Tradeoffs And Clinical Decision Guidance, Juan Garcia

Masters Projects

Purpose: This study compared cone-based stereotactic radiosurgery (SRS) and single-isocenter volumetric modulated arc therapy (VMAT) for multiple (7) intracranial targets to evaluate differences in target coverage, conformality, dose falloff, and normal brain exposure.

Methods: A phantom-based study was performed using progressively increasing configurations of 10-mm spherical targets, from one to seven targets. Cone-based SRS and VMAT plans were evaluated using D99, CI100, CI50, gradient index (GI), maximum dose, V12Gy, and V5Gy.

Results: Both planning techniques achieved similar target coverage. Cone based SRS produced a steeper dose gradient, with a mean GI of 2.99 compared with 4.66 for VMAT ( …

Syllabus: Political Philosophy (Philo 24600 / Polsc 20401), Georgie Malone

Open Educational Resources

This syllabus was created for Political Philosophy (PHILO 24600) (POLSC 20401) at Hunter College. It is an intermediate/advanced introduction to key texts in the history of political philosophy. Course description: In this course, we will journey through the major contributions of those thinkers that have shaped the field we call political philosophy. We will begin with Plato and Aristotle, followed by the social contract theorists of the early modern period—Hobbes, Locke, and Rousseau—before turning to the critical perspectives of Fanon and Marx. We will then turn to the vastly influential work of 20th century liberal philosopher John Rawls and …

Midweek Memo, Georgia Southern University

Midweek Memo

• Applaud 
• Remember 
• Share 
• Experience 
• Around the Nest

Resistance And Adaptation In Banyumas Traditional Gending: Musical Negotiation Between Cultural Preservation And Commercial Performance In Lengger And Ebeg, Darno Darno, Binarung Mahatmajangga

Bahasa dan Seni: Jurnal Bahasa, Sastra, Seni, dan Pengajarannya

This study investigates the musical dynamics of Banyumas-style traditional gending within the contestation of Lengger and Ebeg performances amid the demands of modern entertainment. Using a qualitative method combining ethnomusicological and cultural-sociology perspectives, the study examines changes in musical structure and the socio-cultural forces driving them, and asks specifically: what defines Banyumas gending musicality at the level of instrumental garap (working practice); what concrete forms of adaptation and resistance are observable in contemporary performance; and how these dynamics can be read through Merriam's concept of stability and change and Bourdieu's theory of capital and field. Data were collected through in-depth …

Improving Rural Students’ Access To Advanced Mathematics: A Policy-Based Curriculum Study, Alison Shae Blackledge

Theses and Dissertations

Students with advanced mathematical readiness in rural high schools face difficulties reaching their fullest potential due to significant opportunity gaps. The limited availability of advanced coursework and a scarcity of STEM opportunities often lead to disengagement and behavioral challenges. This project examines the challenges faced by rural students with advanced mathematical readiness and designs a curriculum framework to expand access, support growth, and sustain engagement. Renzulli’s (1977) Enrichment Triad Model serves as the foundation for a curriculum plan intended to transition students from passive learners to independent mathematical investigators. Three research questions are addressed in this study: (1) Which barriers …

Breaking The Chain Or Passing The Torch? Caregiver Type, Perceived Caregiving, And Extent Of Aggression In Emerging Adult Relationships, Amara Mason

Theses and Dissertations

This study examined how caregiver type (alternate caregiving versus biological parent caregiving), childhood adversity, and parenting styles relate to intimate partner violence (IPV) and attachment outcomes. Guided by Intergenerational Transmission of Violence Theory, Social Learning Theory, and Attachment Theory, the study explored whether alternate caregiving buffered or intensified the effects of early adversity on later relational functioning. College students aged 18–25 from a southern U.S. university completed anonymous self-report measures assessing caregiving experiences, childhood trauma, attachment, and IPV. Measures included the Conflict Tactics Scale–Revised (CTS2), Adverse Childhood Experiences Scale (ACEs), and Parental Bonding Instrument (PBI). Hierarchical regression analyses indicated that …

Estimating Leaf Physiological Traits In Eastern Cottonwood And Its Hybrids By Integrating Uav Hyperspectral Images With Statistical And Machine Learning Approaches, Bipin Paudel

Theses and Dissertations

Eastern cottonwood (Populus deltoides) and its hybrids are high-yield, fast-growing short-rotation woody crops with strong potential in bioenergy and industrial applications. Given their genetic diversity, these species require non-invasive assessment of photosynthetic, leaf biochemical, and water-use efficiency traits. These traits reflect plant physiological status, carbon cycling, productivity, as well as nutrient cycling, and hyperspectral remote sensing provides high-resolution spectral information essential for high-throughput phenotyping. Therefore, this study develops a robust framework to predict physiological traits using Unmanned Aerial Vehicle (UAV)-acquired canopy-level hyperspectral reflectance (~400 nm - 1000 nm, with 2.2 nm band spacing) by integrating linear and non-linear machine learning …

Exploring The Viability Of Variable-Design Policy Approach To Addressing Teacher Retention In Kentucky, Donald R. Smallwood

Theses and Dissertations

Teacher attrition among early- and mid-career educators threatens the stability of Kentucky's public school workforce, yet the Commonwealth has largely relied on isolated, single-lever retention strategies. This desk-based capstone evaluated the viability of a coordinated, multiple variable policy framework for improving teacher retention in Kentucky. The study identified, appraised, and synthesized evidence, including peer-reviewed studies, state and national policy reports, legislative documents, and Kentucky-specific working-conditions data. Three research questions guided the study, addressing the evidence for coordinated multiple-variable retention approaches, the evidence for each individual policy lever, and the challenges and opportunities within Kentucky's current retention landscape. Content and thematic …

Decentralized And Privacy-Preserving Intelligent Systems Via Federated Learning For Healthcare Monitoring And Financial Security, George Anim

Theses and Dissertations

The rapid expansion of data-driven methodologies in healthcare and finance is increasingly constrained by ethical, regulatory, and security requirements that limit centralized data sharing. Sensitive information—including electroencephalogram (EEG) recordings and inter-institutional financial transaction logs—remains siloed, reducing opportunities for collaborative model development and limiting generalizability across heterogeneous environments. In healthcare, epileptic seizure prediction is challenged by inter-patient variability, scarce and non-IID EEG data distributions, and the need for real-time inference on resource-constrained wearable devices. In finance, anti-money laundering (AML) detection is complicated by decentralized and dynamically evolving transaction networks, temporal-structural dependencies, limited labeled data, and information-sharing restrictions. This dissertation proposes a …

Engineering Identity And Persistence In Community College Students, Joseph Anthony Minutolo

Theses and Dissertations

As our society becomes more technologically advanced, the need for engineers grows. Academia is tasked with preparing future engineers to meet this increasing need. However, as graduation rates continue to hover around 50%, researchers have begun to investigate what aspects of the student experience have a positive effect on the retention of engineering students. One researched topic is the relationship between engineering identity and persistence. Engineering Identity is rooted in the theoretical framework of Identity Theory, whereas Persistence is grounded in Expectancy-Value Theory. Previous research has shown a positive correlation between engineering identity and persistence among traditional university engineering students; …

Designing A Measure Of County-Level Food Access, Logan Mattingly

Theses and Dissertations

Equitable access to food is a central component of food security and a key determinant of health. Yet current approaches to food access measurement remain fragmented and limited. This study introduces the first of its kind data driven, multidimensional, county-level measure of food access in the United States. Drawing on publicly available data, I employ a factor analysis pipeline to construct a suite of latent variable estimates that represent pillars of food access. This model-based approach allows synthesis of these diverse measures into the resulting Food Access Index (FAI), while explicitly accounting for measurement error and addressing missing data. Resulting …

Examining The Effects Of Oral Melatonin Supplementation On Bull Reproductive Physiology, Megan M. Patterson

Theses and Dissertations

Bull subfertility is a prevalent issue with significant consequences for cattle production. Unfortunately, few management interventions exist to alleviate bull subfertility and improve bull reproductive efficiency. Melatonin, a key regulator of circadian rhythms and seasonal reproduction, improves reproduction in non-seasonally breeding mammals, yet the benefits of oral supplementation in the bull remain underexplored. Therefore, this study aims to elucidate the extent to which melatonin supplementation could serve as a management intervention to improve bull reproductive efficiency. Yearling Angus bulls (n = 21) were utilized to examine the effects of 90 days of oral melatonin supplementation on sperm quality, blood plasma …

Two Essays On Institutional Religion And Entrepreneurship, Myles Melancon

Theses and Dissertations

A large majority of the world is religious. Indeed, religion has long been considered as one of the most influential institutions. However, religion’s influence on economic outcomes—and specifically entrepreneurship—has received only scant attention. In my dissertation, I first draw from New Institutional Economics to develop a mechanism-based framework explaining the specific pathways through which national rates of religious affiliation influence entrepreneurial activity. I then test the direct and indirect relationships between national rates of various religions and entrepreneurial activity. I find a positive relationship between rates of Christian affiliation and entrepreneurial activity and a negative relationship between Islamic affiliation and …

Initial Evaluation Of Hydrogen/Deuterium Exchange-Mass Spectrometry For Filtering Isobaric Candidate Structures Of Metabolites, Olufemi Farotimi

Theses and Dissertations

Mass spectrometry-based metabolomics is a common analytical tool used to identify metabolites. Identifying specific metabolite structures associated with liquid chromatography tandem mass spectrometry (LC-MS/MS) features remain analytically challenging. Complete hydrogen-deuterium exchange (HDX) is hypothesized to be complementary to retention time and fragmentation patterns for narrowing down the number of potential candidate structures for a given precursor m/z. In this work, the hypothetical number of exchangeable protons was assigned to an array of subsets of the Human Metabolome Database (HMDB), based on known exchange behavior obtained from literature. Six model compounds (for which experimental data were also collected, four additional model …

The Role Of The Triassic-Early Jurassic Eagle Mills Formation In The Development Of Smackover Lithium-Rich Brines, Timothy J. Palmer

Theses and Dissertations

Lithium‑rich brines of the Upper Jurassic Smackover Formation represent a major domestic critical‑mineral resource, with USGS estimates of 5.1–19.0 million tonnes of Li in Arkansas. Although Li enrichment occurs only in high‑TDS brines, elevated salinity alone cannot generate the observed Li concentrations; Li must be supplied through water–rock interaction with phyllosilicates. This dissertation evaluates the Triassic–Early Jurassic Eagle Mills Formation as the primary basin‑scale Li source using whole‑rock geochemistry, XRPD mineralogy, petrography, laser‑ablation ICP‑MS, and Li‑isotope analyses of produced brines. The Eagle Mills Formation is thick, made of proximal, mid, and distal fan deposits that include fluvial channel sands, floodplain …

Scale Dependent Microbial Assembly In A Dendritic River Network, Tyler M. Redman

Theses and Dissertations

River networks organize ecological communities across spatial scales, but whether bacterial communities follow these patterns remains poorly understood. This thesis examined microbial community assembly across three nested spatial scales in a dendritic watershed in east-central Mississippi (USA), asking whether dispersal or environmental selection governs community composition at each scale. At the watershed scale, bacterial diversity increased from headwaters to the river mainstem, consistent with longitudinal diversity accumulation predicted by the River Continuum Concept. At the confluence scale, the composition of post-confluence communities can be predicted as simple mixtures of their tributary inputs, supporting that conservative mixing dominates when unique communities …

Microcystin-Lr And Anatoxin-A Effect On Channel Catfish (Ictalurus Punctatus) Immune Cell Function And Susceptibility To Microbial Pathogens (Aeromonas Hydrophila And Edwardsiella Piscicida), Treva Billyard

Theses and Dissertations

Harmful algal blooms are increasing in frequency worldwide, resulting in greater exposure of aquatic organisms to cyanobacterial toxins that threaten fish health and freshwater ecosystems. Although microcystin-LR (MC-LR) and anatoxin-a are well known for their hepatotoxic and neurotoxic effects, respectively, their broader impacts on immune function, cellular metabolism, and host-pathogen interactions remain poorly understood. The objective of this dissertation was to investigate the immunotoxic, metabolic, and molecular effects of MC-LR and anatoxin-a in channel catfish (Ictalurus punctatus) while evaluating the influence of MC-LR on the growth of important bacterial fish pathogens. Channel catfish were exposed to MC-LR or anatoxin-a, and …

A Comprehensive Approach To Cognitive Offloading, Oscar Daniel Ramirez Perez

Theses and Dissertations

Learners use a variety of strategies to engage with real-world learning material. One such strategy is cognitive offloading: the reliance on external stores to alleviate internal cognitive demand. Past research has found that learners remember less when they study with the expectation of access to an external store during a subsequent test relative to when they study without that expectation. One proposed theory is the study effort hypothesis: when learners expect access to an external store, they reduce their encoding effort based on the belief that their internal memory of the information will be less important when they have access …

Staffing Reductions, Visitor Sentiment, And Recreation Demand In U.S. National Parks, Rebekkah Adicoff

Theses and Dissertations

Staffing changes in U.S. national parks have the potential to influence both visitor experience and recreation demand. This study examines how an abrupt system-wide staffing reduction affected visitor sentiment and visitation across the National Park System, while accounting for differences in park-level risk exposure. Using the February 2025 staffing reduction as a quasi-natural experiment, the analysis combines monthly park-level visitation data with TripAdvisor visitor reviews from January 2024 to August 2025. Sentiment scores derived from reviews measure perceived experience quality, while recreation demand is modeled using fixed-effects count models (Poisson and negative binomial) that control for seasonality and park characteristics. …

How Racial Bias And Job-Related Stressors Impact The Prospect Of Police Misconduct, Jean Emmanuel Brutus

Walden Dissertations and Doctoral Studies

Police use of excessive force is an enduring challenge for criminal justice institutions and the public, particularly, affecting minority communities. This has contributed to diminished public confidence in U.S. policing institutions. Prior empirical studies among law enforcement officers, indicate that Black minorities have been discriminated by police officers. Stress research links social stress to mental health and identifies police brutality as an anticipatory stressor for minority groups. The purpose of this qualitative case study was to identify factors, including job-related stressors, and racial bias, that contribute to officers using excessive force, so to fill the gap in research, and develop …

Best-Practice Patient Education On Glp-1, Low-Glycemic Diet, Intermittent Fasting, And Exercise For Weight Loss In Obese Nondiabetics, Clara Green

Walden Dissertations and Doctoral Studies

Executive Summary: Clinical Practice Guideline Best-Practice Patient Education on GLP-1, Low-Glycemic Diet, Intermittent Fasting, and Exercise for Weight Loss in Obese Nondiabetics by Clara Green MS, Walden University, 2020 BS, University of Texas at El Paso, 2014 Executive Summary Submitted in Partial Fulfillment of the Requirements for the Degree of Doctor of Nursing Practice Walden University August 2026