Digital Commons Network^™

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 …

Overcoming Glioblastoma Resistance To Temozolomide With New Derivatives: Design, Synthesis, And Mechanistic Studies, Hualin Zhang

Open Access Theses & Dissertations

Glioblastoma multiforme (GBM) is an aggressive brain tumor with rapid progression and poor prognosis. Although temozolomide (TMZ) remains a central component of standard therapy, its clinical benefit is limited and resistance frequently emerges through DNA repair pathways, particularly O6-methylguanine-DNA methyltransferase (MGMT). Because DNA cross-links are generally more difficult to repair than monoalkylated lesions, we hypothesized that TMZ derivatives bearing protein-reactive functionality might generate damage that is less susceptible to MGMT-mediated resistance. Guided by this rationale, we designed a new class of N3-modified TMZ derivatives containing covalent warheads, developed a synthetic route compatible with the chemical instability of the TMZ scaffold, …

The Role Of Service-Learning & Critical Pedagogy In Student Empowerment Through Self-Consciousness, Democratic, And Culturally Responsive Education, Shahbaa Zaidan

Open Access Theses & Dissertations

This qualitative phenomenological research examines the role of service learning that is based on critical pedagogy in empowering students and developing identity and consciousness in a Hispanic-Serving Institution (HSI) on the United States-Mexico border found in South Texas. This study challenges the top-down paradigm, in which empowerment and learning are considered in view of the practices of educators, their teaching methods, and their impacts on student achievement. The research is bottom-up and student-centered. This research explores how students' experiences during service-learning courses shape their sense of identity, voice, and empowerment. Key theories include critical pedagogy (Freire), experiential learning (Dewey), transformative …

Unveiling The Longitudinal Dynamics Of Discrimination, Identity, And Mental Health Over Time Within U.S. Muslims Among On-Going Palestine Genocide, Manal Aboargob

Open Access Theses & Dissertations

Discrimination is a pervasive stressor that shapes mental health through both direct experiences and indirect, or vicarious, exposure. In contemporary contexts marked by global media saturation, individuals may repeatedly witness discrimination and violence directed toward their social group, amplifying psychological burden. The present longitudinal study examined how direct and vicarious discrimination were associated with affective well-being among U.S. Muslims during the ongoing genocide in Palestine, and whether religious identity and religious coping moderated these associations over time. Participants (N = 103) completed a baseline survey and up to 11 weekly surveys over a three-month period. Multilevel mixed-effects growth models were …

Adjunct Faculty Onboarding Experiences At A Hispanic-Serving Community College In The U.S.-Mexico Border Region: Faculty Perspectives Of Integration And Effectiveness, Melissa Ann Aguilera

Open Access Theses & Dissertations

Since the 1970s, adjunct faculty have become the majority of higher education instructors, yet institutional onboarding practices for adjuncts remain inadequate and are inconsistently studied. Using a basic interpretive qualitative approach, the study explored how adjunct faculty at a Hispanic-serving community college in the U.S.-Mexico border region experienced and perceived their onboarding process. Four adjunct faculty members participated in semi-structured interviews, and data was analyzed using thematic analysis. Findings were interpreted through the Kirkpatrick Model of Training Evaluation and Organizational Socialization Theory. Three themes emerged from the data: the absence of structured onboarding, leaving participants to independently seek institutional knowledge, …

Environmental Movements In El Paso And Ciudad Juarez: Possibilities And Limitations Of Cross-Border Organization At The U.S.-Mexico Border, Vanessa Maria Almada

Open Access Theses & Dissertations

At the U.S.-Mexico border, the anthropogenic and nationalistic construction of the landscape has accelerated urbanization and unequal development without establishing effective binational institutions for governance over a shared commons. Borderlanders, then, contest unsustainable development with the added complexity of navigating a barrier which creates diverse socioeconomic and political realities that challenge cross-border cooperation. This qualitative research analyzes environmental organizations in El Paso and Ciudad Juarez. Through ethnographic study of mobilization in response to environmental legislation and administrative action in each city, the immediate barriers to cross-border cooperation and limitations of nationalistic institutions in the borderlands can be better understood.

Exhumation Of The Pelona-Orocopia-Rand Schist And Fault Kinematic Constraints On Evolution Of The Eastern California Shear Zone, James Boyette Barker

Open Access Theses & Dissertations

Southeastern California has experienced a complex recent geologic history as it continues to evolve from a convergent boundary to a period of NE-directed extension and evolution of the Eastern California Shear Zone (ECSZ). This transition is recorded in exhumed bodies of Pelona-Orocopia-Rand (POR) schist and in changing styles of fault deformation. This thesis has two interrelated goals. First, I aim to refine the timing of transition from NE extension to NS contraction in the ECSZ of southeastern California by integrating (U-Th)/He thermochronology with field-based structural analysis. The second prong of this study is to constrain broader patterns of POR schist …

Bridging Industry And Academia In Engineering Leadership Education: Using Q Methodology To Identify The Viewpoints Of Engineering Professionals On Effective Engineering Leadership, Pamela Edith Campos Valles

Open Access Theses & Dissertations

Background: Engineering leadership has been recognized as a key professional skill by the U.S National Academy of Engineering, leading to increased attention and integration in engineering education research and development. The perception and recognition of leadership within the engineering field remains limited by the widespread definitions of leadership and limited characterization of engineering leaders. The Contextual Engineering Leadership Development framework is grounded on a discipline specific definition of engineering leadership and approaches to leadership development derived from engineering undergraduate programs. The use of this framework provides the opportunity to describe what engineering leaders prioritize, enabling the identification and characterization of …

Exploring Connectivity And Element Distribution In The Critical Zone Using Deep Cores Below Agricultural And Natural Drylands In The American Southwest, Angie Lynette Cano

Open Access Theses & Dissertations

Water movement controls how solutes are transported and stored in arid Critical Zone (CZ) systems. In natural drylands, low precipitation and high evapotranspiration lead to long term salt accumulation in the CZ, whereas irrigation increases water input and increases downward solute transport. This study investigates how agricultural practices alter subsurface hydrology and geochemistry by comparing two deep CZ cores from the southwestern United States: a 50 m deep core beneath a flood irrigated pecan farm named 5R farm, in the Rio Grande Valley in Tornillo, Texas, and a 97.5 m deep core from the Red Lake Playa in the Jornada …

Detecting Early Physiological Signs Of Work-Related Muscle Strain And Fatigue Using Quantitative Sensory Testing, Omar Alberto Cano

Open Access Theses & Dissertations

Background: Work-related musculoskeletal disorders (WRMSDs) are a major source of occupational disability and economic burden worldwide. Early detection of physiological strain remains challenging since traditional methods often rely on self-reported pain or diagnosis after symptom development. Quantitative Sensory Testing (QST) may provide an objective, non-invasive method for identifying early sensory changes associated with repetitive upper-extremity loading. Purpose: This pilot study examined the responsiveness of Pressure Pain Threshold (PPT) and Thermal Threshold Testing (TTT) for detecting Acute muscular strain and fatigue following repetitive manual task performance. Methods: A within-subject counterbalanced design was conducted with sixteen healthy participants. Each participant completed both …

Timing And Synchronization: Software And Hardware Approaches For Precision Maximizing, Christina Alicia Alejandra Carreon Jimenez

Open Access Theses & Dissertations

This thesis explores the design of synchronization mechanisms that allow multiple FPGA boards to operate as if they were a single coherent timing domain. The solutions span three layers: a software PLL for E1 telecommunication links, a PCIe-based timestamp exchange protocol, and a hardware-level multi-FPGA mesh architecture. Across these layers, the work demonstrates that practical, low-cost synchronization can achieve sub-microsecond accuracy without the burden of specialized hardware such as GPSDOs or White Rabbit infrastructure. Experiments show stable alignment within the nanosecond-microsecond range, validating the feasibility of the proposed methods for SDR and telecom applications.

Whirlpoole: A Creative Thesis And Analysis Of Creating Fiction From Real Life Experiences, Holly Marie Cesario

Open Access Theses & Dissertations

N/A

The Intersection Of Occupational Therapy And Optometry In The Treatment Of Visual Impairments: Addressing An Unmet Need, Grace Bannon

Capstone Projects

The prevalence of visual impairments in the United States is substantial and anticipated to increase in severity over the coming decades. These impairments have wide-reaching consequences on an individual’s occupational performance in daily living. While both occupational therapists and optometrists focus on the relationship between visual function and engagement in meaningful and purposeful occupations across the lifespan, only a limited number of optometrists offer specialized vision therapy services. This gap emphasizes a growing demand for vision services to manage the needs of individuals with visual deficits. Therefore, this Doctoral Capstone Experience (DCE) sought to bridge this gap by exploring the …

Identifying The Role Of Occupational Therapy In Suicide Prevention, Grey Buchheit

Capstone Projects

Occupational therapists are uniquely positioned to identify and support individuals experiencing suicidal ideation; however, suicide prevention education remains limited within occupational therapy curricula despite its relevance across diverse practice settings. This doctoral capstone experience sought to address this educational gap by developing evidence-based suicide prevention resources for Western Michigan University's Doctor of Occupational Therapy Program while promoting student wellness and burnout prevention as complementary components of suicide prevention. Guided by a literature review, SWOT analysis, faculty interviews, and a needs assessment that included a survey of Level I fieldwork educators, this project identified opportunities to strengthen occupational therapy education related …

Supporting Neurodiversity-Affirming Practice For Young Adults: Resource Development For A Level I Occupational Therapy Fieldwork Clinic, Grace Campbell

Capstone Projects

Neurodiversity-affirming and strengths-based practices are a growing area of focus within occupational therapy, viewing neurological differences as natural variations of human diversity rather than deficits to be corrected. This Doctoral Capstone Experience (DCE) focused on applying these perspectives within the Work-to-Work Clinic, a Level I occupational therapy fieldwork clinic that serves young adults with neurodevelopmental conditions such as Autism, ADHD, and intellectual disability. Commonly-used assessments and treatment materials at the clinic were outdated, deficit-focused, and poorly suited to this population’s developmental stage, leaving many clients with unmet needs. Additionally, Level I fieldwork students are still developing clinical reasoning skills and …

Pictured And Framed: A Media Analysis Of Local News Coverage Of The Unhoused In Fayetteville, Sabine Skoch

School of Social Work Undergraduate Honors Theses

Amid a growing housing crisis in Fayetteville, local media serves as an influential force in shaping public understanding of homelessness. This study examines how homelessness is framed in local news coverage through a reflexive thematic analysis of ten randomly selected articles published between May 2022 and November 2025. Guided by media framing and attribution theory, this analysis explores how causes, consequences, and solutions to homelessness are constructed within a rapidly growing Southern city.

Three central themes emerged. First, local reporting centers empathy through lived experiences and community testimonies, emphasizing dignity, vulnerability, and structural precarity rather than individual failure. Second, coverage …

Climate Vulnerability In Context: Interpretations Of Risk And Reality In Maine And New Hampshire, Sophie Hope Goodwin

Master's Theses and Capstones

This study examines the relationship between place-based climate vulnerability and belief in anthropogenic climate change in Maine and New Hampshire. While exposure-based models suggest that direct experience with environmental hazards should increase climate belief, sociological research emphasizes the role of political ideology and social context in shaping attitudes. Using county-level measures from the U.S. Climate Vulnerability Index combined with individual survey data from the Pine Tree State Poll and Granite State Poll, this study evaluates whether multidimensional climate vulnerability is associated with belief that climate change is happening now and is primarily caused by human activities. Results from three-step logistic …

Developing A Questionnaire For The Interoceptive Awareness Of Stuttering, Leslie Williams

Graduate Theses and Dissertations

Stuttering is commonly measured through its overt characteristics (blocks, prolongations, and repetitions). This equates to stuttering “severity,” or the frequency of these behaviors. This method, however, does not reflect the lived experience of adults who stutter. This “measurement problem” has been the subject of numerous studies. In this graduate thesis, the measurement problem is addressed by using qualitative data previously gathered by Malcolm (2024) from adults who stutter about the internal experience of stuttering to create survey. Quotes from adults who stutter were gathered, categorized, edited for clarity, and formatted into a survey, The Multidimensional Interoceptive Awareness of Stuttering Scale …

Marvelous And Disturbing: Surreal Imagery, Elaboration And The Limits Of Persuasion In Women's Health Journalism, Shelby Elizabeth Gill

Graduate Theses and Dissertations

Since the 1930s, surrealism has lent its abstract hand to journalism, offering a visual language for topics that resist literal depiction. Given its historical and often fraught association with the female form, surrealist imagery has found a natural home in editorial coverage of women's health, most recently in reporting on endometriosis, a condition whose invisible, stigmatized and difficult-to-articulate experience makes conventional photojournalism an inadequate representational tool. The present study experimentally compared surreal imagery, realistic imagery and a text-only control condition to assess their effects on knowledge acquisition, comprehension, attitudinal responses, perceived risk and behavioral intentions related to endometriosis in a …

Mitigating Inertial Measurement Unit Drift In Quadcopter Trajectory Tracking Using Kalman Filter Sensor Fusion With Global Positioning Measurements, Juan Sandro Caballero Aguilar

Graduate Theses and Dissertations

Unmanned Aerial Vehicles (UAVs) like quadcopters are widely used in civilian and military applications such as farming, photography, search and rescue missions, and autonomous navigation and motion. The performance and stability of these systems depend on accurate state estimation, which provides real-time information about the vehicle’s position, velocity, and orientation. However, achieving reliable state estimation is challenging due to sensor noise, measurement uncertainty, and inaccurate modeling. Common navigation sensors such as the Global Positioning System (GPS) and Inertial Measurement Units (IMUs) exhibit complementary characteristics. GPS provides absolute position measurements but suffers from noise, multipath effects, and low update rates, while …