Digital Commons Network^™

From Instructional Design To Student Experience: Engagement As Designed And Experienced In Asynchronous Graduate Education, Francisco Javier Maldonado

Open Access Theses & Dissertations

The expansion of asynchronous online learning in graduate education has reshaped instructional delivery; however, concerns persist regarding declining student engagement in fully online environments. While faculty often perceive engagement as sustained through structured course design and digital communication strategies, graduate students report experiences of disconnection, diminished motivation, and limited meaningful interaction. This misalignment in perception presents a significant challenge for graduate programs seeking to promote student success and retention. The purpose of this qualitative study is to explore how asynchronous online instructional practices influence graduate student engagement within a Master's-level Higher Education Leadership program. Guided by the Academic Constructs of …

Numerical Methods For Modeling Darcy-Forchheimer Flow In Heterogeneous Porous Media, Nate Mcnair

Open Access Theses & Dissertations

Classic approaches to modeling fluid flow in porous media rely on Darcy's Law, which assumes a linear relationship between volumetric flow rate and the pressure gradient. However, in recent years, applications such as enhanced geothermal systems have highlighted the need to model nonlinear flow behavior, since experimental and observational data show that, once flow velocity exceeds a certain threshold, the relationship between velocity and macroscopic pressure gradient becomes nonlinear. This requires alternative models that more accurately capture the physical behavior of these systems.The Darcy-Forchheimer model provides one such alternative by introducing a nonlinear velocity-pressure relationship. However, this nonlinearity creates additional …

Process Optimization Of Directed Energy Deposition Via Dmaic Methodology And Lean Manufacturing Principles, Erick Gerardo Molina Castaneda

Open Access Theses & Dissertations

Additive Manufacturing (AM), particularly Direct Energy Deposition (DED), has gained increasing relevance in industrial and research environments due to its capability to manufacture complex geometries and repair high-value components. However, despite its technological advantages, DED processes often lack standardization, clear documentation, and structured workflows, especially in academic laboratories. This research aims to optimize and standardize DED processes through the application of Lean Manufacturing principles using the DMAIC (Define, Measure, Analyze, Improve, Control) methodology. The study was conducted at the Keck Center for 3D Innovation, focusing on pre-printing and printing activities. Key issues were identified. Improvement actions included the implementation of …

Linguistic Experiences And Identity Of Mexican-Origin New Teachers In A Rural District In The U.S.-Mexico Frontera, Patricia L. Ocana

Open Access Theses & Dissertations

This qualitative study is developed with the understanding that the linguistic experiences of Mexican-origin new teachers are situated in the socially constructed Institutional Discourses of U.S. schools in la frontera. Discourses that have historically marked Spanish-speaking identities as deficient while privileging English-only norms. Furthermore, the four maestras in this study are considered active agents in their development as bilingual educators and creators of counter-Discourses that affirm the linguistic and cultural identities of their emergent bilingual students. This study looks at Mexican-origin bilingual educators' vivencias as assets that shaped their journeys into the education profession and continue to shape their pedagogical …

Log Anomaly Detection With Parameter-Efficient Tiny Language Models: From Centralized Fine-Tuning To Privacy-Preserving Federated Learning, Isaiah Thompson Thompson Ocansey

Open Access Theses & Dissertations

System logs are a primary source of information for identifying faults, misconfigurations, and security incidents in computing infrastructure. As these logs grow in volume and complexity, manual inspection becomes impractical, and automated detection methods are needed. This thesis investigates how compact language models can be applied to the task of log anomaly detection under two operational conditions: when log data is centralized and when it is located at different data sites.

In the first part, we propose LogTinyLLM, which applies parameter-efficient fine-tuning through Low-Rank Adaptation and adapter-based techniques to adapt tiny language models for identifying contextual anomalies in log sequences. …

Interprofessional Education For Teachers: Exploring Adult Learning Of Collaboration Through Cultural-Historical Activity Theory, Berenice Peralta Matus

Open Access Theses & Dissertations

This qualitative study examines how participation in an Interprofessional Education (IPE) simulation event influenced participants' understanding of collaboration. Grounded in Cultural-Historical Activity Theory (CHAT), the study examined how participants made meaning of collaboration, and the barriers to collaboration and interdisciplinary work both at their graduate program and their work environment. Data was collected in three phases and included semi-structured interviews with teachers before and after the event, observation fieldnotes and video of the event. I analyzed the data using CHAT as the interpretative conceptual framework for thematic interpretation of concepts such as mediation, contradictions, division of labor, and activity systems. …

An Ordinal Categorical Data Analysis Using The Stereotype Model Within A Bayesian Framework With A Logistic-Normal Prior, Nathaniel A. Sakyi

Open Access Theses & Dissertations

Ordinal categorical data are pervasive in applied research, yet their analysis is often compromised by modeling strategies that implicitly assume equidistant category spacing or impose restrictive structural constraints. Metric regression models and latent-variable threshold approaches routinely misrepresent ordinal information, leading to biased inference, distorted uncertainty quantification, and loss of structural insight. This paper develops a Bayesian framework for ordinal regression that explicitly accommodates \textbf{unequal spacing among ordered response categories} while preserving ordinal structure and interpretability.

The proposed approach builds on the stereotype regression model, which embeds ordinal categories into a latent one-dimensional continuum through estimable score parameters. While the stereotype …

Daughters Of The Road, Kristen Marie Sche

Open Access Theses & Dissertations

The beloved Road Novel has long been a tale submerged in the coming-of-age story following men as they search for themselves along the American highways. The genre can vary from journeys of families seeking refuge or tackling a task to men seeking answers to something missing in their lives. However eclectic the genre, it lacks in the pilgrimage of girls finding what the road can bring to them in a literary fictional context. This thesis provides a novel written in the popular genre while exploring themes of sisterhood, grief, and inclusion through the context of a hybrid form of narration …

Understanding Gambling Behavior Among Hispanic College Students: The Role Of Attitudes, Norms, Self-Efficacy, And Acculturation, Joshua Torres

Open Access Theses & Dissertations

Gambling has become increasingly accessible and socially normalized among young adults, particularly through mobile platforms and the expansion of legalized sports betting. Hispanic college students may be at heightened risk for gambling-related harms, given evidence of elevated rates of problem gambling, comorbid mental health concerns, and underrepresentation in empirical research. Cultural factors, such as acculturation, may further influence engagement in gambling behaviors and susceptibility to negative outcomes. Guided by the Theory of Planned Behavior, the present study investigated the relationships between gambling injunctive norms, gambling attitudes, and gambling self-efficacy across three outcomes: gambling frequency, problem gambling severity, and gambling intention. …

Bridging Leadership: An Autoethnographic Inquiry Into The Governance And Decision-Making Experience Of A Latina Rural School Superintendent, Rosa Isela Vega-Barrio

Open Access Theses & Dissertations

This autoethnographic study, Bridging Leadership: An Autoethnographic Inquiry into the Governance and Decision-Making Experience of a Latina Rural School Superintendent, examines how governance and leadership are experienced and enacted through the sustained relationship between a superintendent and a school board president in a rural border district along the U.S.-Mexico border, the study explores how power, trust, reciprocity, role expectations, and ethical tension evolve within this leadership partnership over time. Grounded in Relational Leadership Theory, Social Exchange Theory, and Role Theory, the study conceptualizes leadership as a relational and contextually embedded process rather than a function of positional authority. Using autoethnography …

Effective Prediction Of Martensite Start Temperature By Hybrid Machine Learning And Ethical A.I. In Materials Science, Agniprava Banerjee

Open Access Theses & Dissertations

The martensite start temperature Ms governs heat treatment design and mechanical property development in martensitic steel alloys. Accurate prediction of Ms from chemical composition alone would accelerate alloy development, yet existing empirical equations lack accuracy for multi-component steels and purely data-driven models provide no physically principled behavior outside their training domain. This dissertation develops a hybrid machine learning-physics framework for predicting Ms in steel alloys from composition. The MAP Cambridge dataset (1,020 cleaned records, 15 alloying elements) is processed through a five-stage cleaning pipeline and a 21-feature physics augmented representation, including the Ghosh-Olson Ms thermodynamic prediction as an explicit feature. …

Additive Manufacturing Of Spatially Variant Actuating Structures From Shape Memory Polymers., Katia Lizbeth Delgado Ramos

Open Access Theses & Dissertations

This dissertation studies the structure-processing-function relationships of additively manufactured shape memory polymer blends, with emphasis on mechanical anisotropy. Chemical exposure, thermally activated recovery, self-healing behavior, and 4D printed functional response. Two polyester-based blends were studied: a binary blend composed of polycaprolactone and thermoplastic polyurethane (PCL/TPU) blend, and a ternary blend composed of polycaprolactone/thermoplastic polyurethane/ polylactic acid (PCL/TPU/PLA) blend. The materials were melt-compounded using a twin-extruder to produce filament for fused filament fabrication (FFF). Specimens were fabricated using four different raster orientations, 0°,90°, 0/90°, and 45°, to investigate the influence of processing architecture and composition on the mechanical performance, recovery behavior, …

Hvsr-Based Resonance Analysis And Fault Zone Characterization In The El Paso Region, Alexandro Dominguez

Open Access Theses & Dissertations

Horizontal to Vertical Spectral Ratio (HVSR) analysis offers an efficient method for characterizing near-surface structure, resolving sediment thickness, and identifying fault-controlled basin geometry in regions with strong impedance contrasts. This study applies HVSR techniques to continuous ambient-noise recordings collected across the El Paso region, a tectonically active segment of the southern Rio Grande Rift where accurate subsurface mapping is essential for seismic hazard assessment. Ambient-noise windows were processed, spectrally smoothed, and stacked to obtain stable HVSR curves, from which fundamental resonance frequencies and corresponding sediment-thickness estimates were derived. Spatial patterns in these resonance frequencies reveal pronounced basin asymmetry, abrupt lateral …

Impaired Tunability Of Brain State And Motor Dysfunction In A Mouse Model Of Rett Syndrome, Victoria Kindler Norman

Graduate Theses and Dissertations

Rett syndrome (RTT) is a rare neurological disorder, caused by disrupted function of the MECP2 gene, resulting in impaired cognitive and motor functions. Previous studies suggest that although MECP2 has important functions throughout the body, the etiological origins of RTT-related dysfunction should be sought within the brain. However, it remains a mystery how neural population dynamics are altered in the RTT brain and how these alterations relate to motor dysfunction. Previous studies using an RTT mouse model point to abnormal correlations among firing rates of neurons. Here we hypothesize that such disrupted neural activity correlation could be caused by abnormal …

Connecting Work And Family Life: The Effects Of Family-Related Moderators On Idiosyncratic Deals Of Employees And Work Outcomes., Tanushree Chatterjee

Open Access Theses & Dissertations

Idiosyncratic deals (i-deals), which are customized work arrangements negotiated between employees and their organizations, have been increasingly recognized as a strategic mechanism for addressing the heterogeneous needs of today's diverse workforce. However, existing research has largely overlooked the role of employees' family backgrounds as a moderating context that shapes their effectiveness. Drawing on work-life border theory (Clark, 2000) and conservation of resources theory (Hobfoll, 1989), the study tests whether work-family conflict and work-family enrichment mediate the downstream effects of i-deals on turnover intentions and job performance through the moderation of four family-related characteristics (parent status, number of children, family support, …

How To Make Tamales: Stories, Jeanette Colby

Open Access Theses & Dissertations

In all its intersectionality, I see my thesis as a female journey of identity and maturation. A common theme in my writing always leads back to my upbringing in some way; my history, memories, and beliefs inevitably plague the storytelling animal that lives within me. These different kinds of narratives represent all the parts of my identity. At the same time, the fictional scenes allow me to dramatize and interpret specific life events, while the mythic narratives provide a symbolic framework for exploring psychological and spiritual truths that might transcend conventional logic. Almost all of these pieces reflect various aspects …

First-Principles Study Of Uranium Mononitride, Roy Noe Herrera Navarro

Open Access Theses & Dissertations

This thesis presents a first-principles investigation of uranium mononitride (UN), withemphasis on the connection between uranium 5f electron correlation and defect stability. Electronic-structure calculations were performed within density functional theory using the Vienna Ab initio Simulation Package. Exchange-correlation effects were treated within the generalized gradient approximation, and a Hubbard correction was applied to the uranium 5f manifold. The adopted Hubbard parameter was motivated by first-principles linear-response analysis and considered in the broader context of DFT+DMFT descriptions of correlated uranium systems, including recent interpretations of UN as a Hund-metal system. Bulk UN was studied in unit-cell and 2 x 2 x …

Singularity-Enriched Neural Networks For Elliptic Problems In Polygonal Domains, Harshini Reddy Kodiganti

Open Access Theses & Dissertations

This thesis develops and analyzes neural-network-based solvers for the Poisson equation on polygonal domains, where re-entrant corners induce reduced solution regularity and challenge standard numerical methods.

Three neural formulations are investigated: Physics-Informed Neural Networks (PINNs), Physics-Informed Extreme Learning Machines (PIELMs), and Rank-Inspired Neural Networks (RINNs). PINNs rely on gradient-based optimization with automatic differentiation, while PIELMs employ randomly initialized hidden features with least-squares training, achieving significantly lower computational cost. RINNs extend this framework through covariance-driven orthogonalization to improve numerical conditioning and stability.

On convex polygonal domains, all three methods are benchmarked against analytical solutions. Both PIELM and RINN consistently achieve higher …

Metabolomics In The Dryland Critical Zone: The Role Of Soil Metabolites In Phosphorus Acquisition, Kalpana Kukreja

Open Access Theses & Dissertations

Earth's Critical Zone (CZ) plays a key role in sustaining life through carbon, water, and nutrient cycling from the top of the canopy to the groundwater. A key feature of critical zone research is the integration of multiple interdisciplinary techniques. An emerging set of techniques that can add to this approach is the field of metabolomics, the quantification and study of comprehensive metabolite profiles. In this dissertation, I apply metabolomics to address knowledge gaps in dryland critical zone ecosystems, specifically how soil metabolite dynamics influence biogeochemical processes, and with a particular emphasis on phosphorus (P) cycling in the Chihuahuan Desert. …

Plant Communities Of Arid Ephemeral Stream Streams, Biogeographic Filters, Climatic Sensitivity, Urban Impacts Across Spatial And Temporal Scales, Luis Miranda

Open Access Theses & Dissertations

Ephemeral stream networks, locally known as arroyos, are among the most ecologically significant yet least protected habitats in arid landscapes. Despite supporting a disproportionately high plant biodiversity compared to surrounding uplands, these riparian systems lack regulatory protection in most arid U.S. states and face increasing pressure from urban expansion and intensifying climate change. There is an urgent need to understand how these factors influence riparian plant communities and hinder their ability to recover, enabling effective conservation and management strategies. In this dissertation, I explored the interplay of biogeographic gradients, precipitation variability, and urbanization in shaping arroyo riparian plant communities across …

Additive Manufacturing Of Roman Concrete-Inspired Self-Healing Polyvinyl Alcohol-Polylactic Acid Blends: Influence Of Composition, Processing Temperature, And Raster Pattern On Print Quality And Mechanical Performance, Stephanie Moreno

Open Access Theses & Dissertations

This study investigates development of Roman concrete-inspired self-healing polymer blends based on polyvinyl alcohol (PVA) and polylactic acid (PLA) for the additive manufacturing (AM) process of fused filament fabrication (FFF). The motivation for this work stems from the need to enhance durability and functionality of biodegradable polymers while addressing environmental concerns associated with plastic waste. Inspired by the multifunctional and hierarchical architecture of Roman concrete. PVA is integrated as a hydrophilic, sacrificial phase similar to lime clasts, embedded inside a PLA-rich structural matrix to promote physical interaction and water-activated self-healing behavior. Binary PVA:PLA blends with ratios of 5:95, 10:90, 20:80 …

Dynamic Joint Stiffness Druing Jogging In Individuals With Chronic Ankle Instability, David Saltiel Nava

Open Access Theses & Dissertations

Background: Lateral ankle sprains (LAS) are common musculoskeletal injuries and may progress to chronic ankle instability (CAI), which is characterized by recurrent sprains, perceived "giving way," and altered ankle mechanics. Dynamic joint stiffness (DJS) quantifies a joint's resistance to angular displacement under external loading and may provide insight into ankle stability during dynamic tasks. Although prior CAI studies have examined DJS during walking or jumping, limited evidence exists during jogging. This study examined phase-specific ankle DJS and ankle work variables during jogging in individuals with and without CAI. Methods: Ninety participants were included (40 CAI, 50 uninjured controls). All participants …

Implementing Mtss In Hispanic Serving Middle Schools From The Concept Of Rurality: A Qualitative Case Study On School Mental Health And The Role Of Social Work, Rosario Elena Olivera

Open Access Theses & Dissertations

Purpose: The purpose of this study was to examine the implementation of Multi-Tiered Systems of Support (MTSS) and the integration of mental health services within two middle schools in a suburban-rural mix, predominantly Hispanic school district in Southwest Texas, referred to as Desert View Independent School District. The study explored how educators and school-based mental health professionals perceive, interpret, and operationalize MTSS within their school contexts. Methods: The study employed a qualitative case study design grounded in implementation science and ecological systems theory. Data were collected through purposive sampling and included semi-structured interviews with teachers, counselors, and a district-level school …

Understanding Machine Learning Model Behavior Under Fairness And Privacy Constraints, David Anthony Sanchez

Open Access Theses & Dissertations

Machine learning systems deployed in high-stakes domains are increasingly expected to satisfy demands beyond predictive accuracy-including fairness across demographic groups, protection of sensitive information, and explanations that human stakeholders can inspect and trust. This thesis investigates how those demands can be met through learning frameworks that explicitly govern the relationship between data and models, arguing that trustworthiness is a design problem rather than a post hoc correction. The thesis is organized around three studies, each targeting a distinct point of data-facing control. The first develops CondFairGen, a fairness-aware conditional generator for tabular data that improves subgroup equity by dynamically reweighting …

Eocene To Oligocene Continental Arc Migration In Ecuador And The Origin Of Spatiotemporal Trends In Zircon Lu-Hf Radiogenic Isotopes, Muriel M. Sandoval Vazquez

Open Access Theses & Dissertations

The modern continental arc system in Ecuador is well understood but less is known about arc systems in the past, hindering our understanding of the tectonic evolution of the northern Andes. The Macuchi arc, located in the Western Cordillera of Ecuador, was thought to be the main continental arc system during the Eocene, but new zircon U-Pb LA-ICPMS dates from intrusive arc rocks in central Ecuador indicate a more complex history. During the mid-Eocene, the footprint of arc magmatism broadened and expanded into the Inter-Andean Valley and Eastern Cordillera. During the late Eocene to Oligocene, the arc migrated back toward …

The Transformation Of Mexican-American Fathers In Doctoral Studies, Harat Ridrigo Saucedo

Open Access Theses & Dissertations

Fatherhood and minority are words that are not discussed enough in academia. While there has been an awakening in women enrolling and graduating in higher education, the same cannot be said about males, especially fathers of Mexican-American background. As the fastest-growing minority, Mexican-American fathers in doctoral studies are the most underrepresented. The current state of research in the field is minimal, focusing on Mexican-Americans in undergraduate courses, mothers in graduate courses, and males in graduate courses; little is found on Mexican-American fathers in doctoral studies. The research in this qualitative study was designed to address the limited knowledge about Mexican-American …

Understanding The Role Of The School Librarian: Insights From Principals And Librarians, Ruby Shivery

Open Access Theses & Dissertations

This study examines how principals and school librarians understand and define the role of the school librarian with the K-12 school system. Guided by Role Conflict Theory, the study explores how differing expectations regarding instructional support, leadership, collaboration, and library management contribute to role ambiguity and professional tension. As the responsibilities of the school librarian continue to expand, inconsistencies in how the role is perceived may influence both professional relationships and the effectiveness of the library programs themselves. Using semi-structured interviews with both principals and school librarians, the study investigates areas of alignment and conflict in participants' perceptions of the …

Salience Network Circuit Dynamics In Distress Tolerance And Drug-Seeking Vulnerability, Marina Alicia Smoak

Open Access Theses & Dissertations

The psychological distress experienced during drug withdrawal can lead individuals with substance use disorder to abandon their goal of abstinence. Numerous human studies demonstrate that an inability to persist in challenging, goal-directed behavior while experiencing psychological distress is associated with multiple stages of substance use, including relapse. This behavioral construct is referred to as low distress tolerance (DT). Rodent models of DT similarly show that low DT predicts elevated cocaine relapse, particularly when DT is assessed following extended abstinence. This abstinence period corresponds with the incubation of craving, a phenomenon characterized by progressively increased cocaine-seeking over time. Importantly, relapse vulnerability …

Lay Perceptions Of Alternative Dispute Resolution In Civil Legal Disputes, Ashley Gale Vaughan

Open Access Theses & Dissertations

This thesis examined how laypeople evaluate alternative dispute resolution (ADR) procedures in civil legal disputes, focusing on outcome favorability, procedural format, and procedural choice. Drawing on procedural justice theory, two vignette-based studies tested whether mediation would be evaluated more favorably than arbitration and whether allowing participants to choose the ADR process would improve satisfaction and perceptions of procedural justice. Study 1 used a 2 x 2 between-subjects design with undergraduate participants (N = 140) and manipulated ADR process (mediation vs. arbitration) and outcome (favorable vs. unfavorable). Study 2 extended this design by adding a choice condition in a community adult …

Bead-Weaved Layered Prints For Improved Interlayer Adhesion In Additive Manufacturing, Arianna Isabel Villegas

Open Access Theses & Dissertations

Additive manufacturing (AM) with polymer materials has widespread adoption across industries due to its numerous benefits: rapid prototyping, material variety, cost efficiency, manufacturing complexity, on-demand production, and sustainability. AM enables fast prototyping, diverse material choices, and cost savings by eliminating tooling and reducing waste. It excels at producing intricate, lightweight designs. On-demand production reduces inventory and lead times. Polymer AM contributes to sustainability by minimizing material waste. These advantages make polymer AM popular in aerospace, automotive, healthcare, and consumer products industries. Despite these advantages, interlayer adhesion has been a reoccurring issue with AM of polymer materials. With polymer printing, there …