Digital Commons Network^™

Degradation And Metabolic Analysis Of Synthesized Quorum-Sensing Signals By The Model Eukaryote Chlamydomonas Reinhardtii, Adam Josef Bach

Theses and Dissertations

Bacterial organisms can “talk” with one another on a colony-wide scale using a communication system known as quorum-sensing (QS) via chemical signals. These signals are produced at a basal rate throughout the life of the bacteria and are classified as autoinducers, which diffuse across the cell membrane. Once the critical concentration is reached, they begin to diffuse back into the cell and initiate a phenotypic change. As these signals exist outside the membrane of their producer, they are also accessible to other organisms. It has already been noted that some plant species uptake these compounds through their roots and break …

Employee Perspectives Of Addiction: Effects On Workplace Dynamics, Alex Silverman

Theses and Dissertations

This study examined how employees perceive and respond to coworkers experiencing substance use disorders (SUDs) and behavioral addictions in workplace settings. Integrating attribution theory, stigma frameworks, and Quality of Work Life (QWL) perspectives, a controlled vignette-based design was administered to 130 employed adults who evaluated hypothetical coworkers across addiction conditions. Multilevel modeling revealed that SUDs were perceived as more severe than behavioral addictions, and higher perceived addiction severity was associated with greater stigmatizing attitudes. Stigmatizing attitudes, in turn, were differentially associated with workplace behavioral responses: stigma was strongly associated with increased distancing and reporting behaviors but was not significantly associated …

Range Extension Of Electric Propulsion General Aviation Aircraft Using Solar Technology, Mary Kathryn Shultz

Theses and Dissertations

Alternative propulsion technologies in aviation have been a long-time topic of interest as operators aim to bypass growing fuel prices and meet environmental sustainability requirements set globally. Research regarding alternative propulsion technologies is primarily centered around marginally improving efficiency of combustion systems or large-scale implementation of novel technologies. This research evaluates the feasibility of implementing solar-integrated propulsion for general aviation aircraft to extend range through a comparison of full-electric, hybrid solar, and internal combustion engine propulsion systems. This evaluation of existing technology by range analysis indicates that hybrid solar‑electric propulsion is viable primarily for short‑range training and recreational aircraft, rather …

Moodify: A Mood-Based Music Recommendation System, Meghana Kagitha

Theses and Dissertations

Music has long been recognised as a powerful tool for emotional regulation, yet existing music streaming platforms often fail to align song recommendations with a user's current emotional state. Moodify is a mood-based music recommendation system designed to bridge this gap by delivering personalised playlists that reflect how a user feels in real time.

This project presents the design, development, and evaluation of Moodify, a mobile application that leverages the Circumplex Model of Emotion to capture user mood through an intuitive two-dimensional valence-arousal interface. Rather than relying on text input or manual search, users plot their emotional state directly onto …

Adaptive Artificial Potential Field Guidance And Control For Autonomous Docking With Uncooperative And Unknown Spacecraft, Steven Holmberg

Theses and Dissertations

The increasing demand for on-orbit servicing (OOS), active debris removal (ADR), and space domain awareness (SDA) missions has increased the need for autonomous spacecraft rendezvous and proximity operations (RPO) with uncooperative and unknown targets. Traditional guidance and control methods are typically designed for cooperative systems with known geometry and state information. This work builds on previous research to develop and evaluate an artificial potential field (APF)-based control framework capable of autonomous operation with minimal prior target knowledge and applicability to both relatively static and tumbling spacecraft.

The proposed APF formulation incorporates established safety constructs from cooperative docking systems, including an …

Moon Adaptive Technology For Extraterrestrial Architectural Robotics (Matear), Candela Noemi Solis Zampini

Theses and Dissertations

The Moon Adaptive Technology for Extraterrestrial Architectural Robotics (MATEAR) focuses on the development of an autonomous robotic system capable of providing structural building blocks directly from lunar regolith. As a sustained human presence on the Moon becomes a necessity, the costly and limited payload capacity associated with transporting construction goods from Earth creates a critical challenge. MATEAR addresses this problem through in-situ resource utilization (ISRU), integrating a regolith processing system onto a remote operated vehicle. The proposed system is designed to collect lunar dust, mechanically compact the material, and apply thermal treatment to enhance cohesion through sintering. These regolith-made bricks …

Beyond Moving Hands: Narratives Around Deaf Education, Sara Simpson

Theses and Dissertations

This qualitative narrative study explored the experiences and perspectives of deaf educators and educational interpreters working in high school settings. Participants shared narratives about their professional experiences, training, and roles in deaf education. By considering their professional histories, backgrounds, and cultural perspectives, this study examined how these experiences shaped participants’ perceptions of the current state of deaf education.

Using a qualitative narrative research design, three participants with experience working in high school deaf education settings were interviewed individually and later participated in a focus group discussion. The interviews and focus group centered on participants’ perspectives regarding key issues in deaf …

Exploring Servingness Through Pedagogy: A Critical Case Study Of An Hispanic Serving Institution, Yemin Sánchez

Theses and Dissertations

This critical ethnographic case study advances current understandings of what it means to teach at an Hispanic Serving Institution (HSI) and how faculty enact servingness within an HSI enrolling high indices of Latin@/Hispanic students. Drawing on decolonial, culturally sustaining and liberatory pedagogical frameworks, this study interrogates how constructs such as Hispanic, Latin@/Latinx, or coloniality shape the pedagogical conditions under which faculty operate. Using pláticas with ten faculty members, this research study demonstrates servingness is not a technique or an institutional designation, instead, it is a fluid and deeply humanizing ecology with five mutually reinforcing dimensions: Servingness as Relational Praxis, Servingness …

Electrical Resilience In Water Treatment Plants: An Extreme Weather And Lightning Protection Study, Genesis Martinez

Theses and Dissertations

Water treatment plants (WTPs) are vital infrastructure systems that depend on sensitive electrical, electronic, and control equipment to ensure the continuous supply of safe drinking water and effective wastewater treatment. As global temperatures rise and climate change accelerates, the frequency and intensity of extreme weather events—such as hurricanes, flooding, and increased lightning activity—are becoming more pronounced. These events pose significant risks to the electrical resilience of water treatment facilities, often leading to power outages, equipment failures, grid instability, and prolonged service disruptions. This report explores the impacts of extreme weather, with a particular focus on lightning and electrical surges, on …

Teacher Narratives Of Curriculum Implementation In Bilingual Education: A Vygotskian Analysis, Jose F. Orozco

Theses and Dissertations

This narrative inquiry explores bilingual educators' experiences implementing the Amplify Reading curriculum in a diverse, Title I-funded urban district. As schools adopt standardized curricula, tensions emerge between monolingual standards and the needs of bilingual students. Using a Vygotskian framework with Cultural-Historical Activity Theory (CHAT) and Knowledge Structures (KS), the study examines how teachers navigate systemic contradictions and how these tensions influence their professional identities.

Using an interpretivist approach, data were collected via semi-structured interviews, a focus group, and a researcher’s journal from six experienced bilingual educators. Thematic analysis reveals profound structural fractures within the activity system: a primary contradiction between …

Modeling Causal Interactions Across Brain Functional Systems For Population-Specific Disease Analysis, Alissen Moreno

Theses and Dissertations

Functional brain connectivity provides critical insight into neural mechanisms underlying neurodegenerative and affective disorders. Traditional neuroimaging studies rely on undirected or region-specific connectivity measures developed predominantly using racially homogeneous cohorts, limiting fairness and generalizability across diverse populations.

We propose a population-aware framework modeling directed causal interactions across large-scale brain functional subnetworks. Resting-state fMRI data from the HABS-HD cohort were used to construct subject-level causal connectivity matrices via ICA-LiNGAM, aggregated into interpretable system-level hyper-connectomes representing interactions among eleven canonical brain subsystems. These features trained nonlinear models for Alzheimer’s disease stage classification and trait worry prediction.

Results demonstrate that MLP models outperform …

Investigating Pre-Service Teachers’ Readiness For Early Reading Instruction: A Mixed Methods Study Of Quantified Knowledge In Phonemic Awareness And Lived Experiences, Kristin Morgan

Theses and Dissertations

This dissertation examines the lived experiences of pre-service teachers as they develop their knowledge and instruction skills during a three-week module within their first literacy course in a teacher preparation program. Literacy courses play an important role in equipping pre-service teachers with the knowledge and skills necessary to promote reading development. Research suggests that phonemic awareness is a crucial skill that predicts later reading achievement; however, many teachers lack the necessary experience and knowledge. This gap raises concerns about teacher preparation programs and how pre-service teachers learn. Guided by Vygotsky’s sociocultural theory, this sequential explanatory mixed-methods study sought to understand …

Impact Of Multicultural Literature Through Reader's Response, Rachel Konrad

Theses and Dissertations

The purpose of this study is to examine how students respond to using five multicultural read aloud texts and responding to them in a response. The goal of this study was to see if student engagement improved as a result of the study and if student comprehension improved through the use of pre and post assessments. Student data was collected that included a pre and post assessment, anecdotal records of student discussion, responses to texts, and student and parent surveys. Students discovered and discussed themes across texts such as cultural identity, community, and belonging.

The Impact Of Mentor Text On Second Grade Writing, Brittany A. Still

Theses and Dissertations

The purpose of this study was to (a) ascertain the effect mentor text had on student engagement and (b) determine the impact mentor text had on student writing style. Students utilized strategies from five mentor texts during the writer's workshop to write their own personal narratives. Students demonstrated increased engagement through class discussions following each read aloud. Writing style was impacted as students implemented different writing elements into their own writing based on the mentor text discussed. Implications for teaching writing are discussed.

Foreign Language Experience Effects On L2-Accented Speech Attitudes In College Students, Jordan L. Ellington

Theses and Dissertations

The purpose of the study is to test whether knowledge of a second language in college students can affect perceptions and prejudices towards speakers with foreign accents. The testing was completed through both implicit and explicit attitudinal measures in regard to recorded audio stimuli. The explicit attitudinal testing was performed through participant self reporting of attitudes. Participants were presented with first (L1) or second (L2) language accented English samples and then rated that speaker in terms of various characteristics or traits that represented the speaker's solidarity and status. The implicit testing was performed in an Auditory Implicit Associations Test on …

Preserving The Untold Stories: Leveraging Emerging Technologies (Ai And Machine Learning) For Archiving Hidden Histories Of Children And Families Impacted By The Little Rock School Integration Crisis, Oluseyi Noah Adebanjo

Theses and Dissertations

This thesis challenges the dominant narrative of the Little Rock School Integration Crisis by recovering the hidden histories of families and siblings who made integration possible but have been systematically overlooked by historians. While existing scholarship focuses on the Little Rock Nine as individual heroes, this research demonstrates that integration was fundamentally a family crisis requiring collective decision-making, economic sacrifice, and multigenerational support networks. Through close reading of published memoirs, newspaper clippings, school board minutes, and original oral history interviews with Phyllis Brown and Dr. Sybil Jordan Hampton, this study reveals how approximately 200 eligible families were systematically reduced to …

Recognizing Metaphorical References To Sexual Assault Resistance And Represented Rape Myths In Coraline (2009), Braden Slater

Theses and Dissertations

Is there any value in children’s horror literature and film? Literary theorists have shown that children’s horror is uniquely positioned to be not only captivating and accessible, but also educational and hopeful for some young audience members. Like most fictional monsters, those presented in children’s horror can be read as metaphors for the fears and experiences people face in real life. Scholars have argued that engaging with this type of frightening media may help people confront challenging ideas and feelings from a place of safety. Building on this theoretical foundation, I perform a close reading of the 2009 film Coraline, …

Gratitude And The Second Language Writer: The Effects Of Gratitude Journaling In The English Language Writing Classroom, Lauren Smith

Theses and Dissertations

Gratitude journaling interventions have repeatedly been shown to enhance wellbeing when conducted in participants’ first language (Emmons & McCullough, 2003; Sansone & Sansone, 2010), yet no studies to date have examined these practices in second language (L2) contexts. This mixed-methods quasi-experimental study investigated the effects of a six-week gratitude journaling intervention on adult L2 English writers enrolled in an intensive English program. Eleven writing classes (N = 183) were randomly assigned to either a gratitude journaling group or a neutral-events control group, with 123 participants completing all four stages of data collection. Trait gratitude and subjective wellbeing were measured pre-intervention, …

Exploring Subject-Verb Agreement Challenges Among Third-Grade Portuguese Dual Language Immersion Students: A Mixed-Methods Study, Marisa Tobias

Theses and Dissertations

Dual Language Immersion (DLI) programs are commonly recognized for supporting the development of oral proficiency; however, persistent challenges with grammatical accuracy, particularly subject-verb agreement, remain common among elementary-aged learners. This mixed-methods study focuses on third-grade students in a Portuguese DLI program and examines how they use present-tense verb forms in different classroom contexts. Drawing on classroom observations, instructional materials, and students’ oral and written production, the study analyzes the nature of the input learners receive and the types of errors that persist during oral communication. Findings indicate that students demonstrate greater accuracy during structured tasks, while difficulties with subject-verb agreement …

Maximizing Uinta Basin Oil Well Yield Through Geochemical Fingerprinting Of Produced Water, Troy W. Day

Theses and Dissertations

The Uinta Basin is an unconventional oil play that has, since 2017, annually increased hydrocarbon extraction through modern drilling and fracing techniques with increased frac loading. The primary production target is the Uteland Butte Member of the Green River Formation, which consists of interbedded limestones, dolostones, and thick, organic-rich mudstones. Along with increased hydrocarbon production, volumes of produced water from the Uteland Butte Member have also risen. Water is co-produced with hydrocarbons and is an undesirable byproduct of hydrocarbon extraction. Large frac operations now consistently have highly variable percentages of recovered water volume relative to oil. This increase in water …

Improving Electrochemical Measurements And Informing Future Reprocessing Of Advanced Nuclear Fuels, J. Marvin Torrie

Theses and Dissertations

This research promotes the application of molten salts through developing analytical tools in electroanalytical studies and in the data analysis of vapor pressure data. The electrochemical community lacks standardized, stable, and repeatable reference electrode designs which threaten the reliability of measured thermophysical properties and repeatability of published studies. This work confirms the application of a saturated reference electrode design for molten chlorides systems that outperforms traditional Ag+/Ag reference electrodes. In the field of thermal physical property measurements, vapor pressure data for chloride salts are diffused throughout the literature, uncertainty quantification is absent or limited, and all previous studies rely on …

Stitched Together: Mourning And Memory In Latter-Day Saint Embroidery, Elizabeth Finlayson

Theses and Dissertations

As the Church entered into a period of mourning, confusion, and uncertainty following the 1844 imprisonment of religious leaders Joseph and Hyrum Smith in Carthage Jail in Illinois, artists turned to their canvases to grapple with and depict these events. Ashlee Whitaker calls attention to this shift in Mormon art, noting how Latter-day Saint artists painted portraits, landscapes, and commemorative scenes to promote Church authorities and “covenant kinship” as the organization experienced both a leadership crisis and abrupt relocation. Whitaker’s analysis, however, focuses almost completely on paintings done on canvas by men in America such as Danquart Weggeland, C.C.A. Christensen, …

Robust And Interpretable Cross-Domain Arabic Readability Prediction Using Hybrid Modeling: Evidence On The Limitations Of Transformer-Based Classifiers, Sarah Alzu'bi

Theses and Dissertations

Automatic readability assessment aims to predict how difficult a text is for readers to understand. The concept of readability has been widely studied across languages due to its significant impact on reading comprehension, leading to the development of various methods and approaches. In this study, I addressed two key challenges in readability assessment. First, I examine the performance of statistical classifiers and transformer-based models, including CAMeLBERT(Inoue et al, 2021.) with a focus on their ability to generalize under domain, genre, and stylistic shifts. Second, I investigate the interpretability of transformer performance in readability task, which are often criticized for their …

“Music Is The Instrument To Bring The Heart Of A Community Together”: Frederic Balazs And The Tucson Symphony Orchestra, 1952-66, Jackie Bodily Biggs

Theses and Dissertations

The audience for classical music is declining, according to data from the National Endowment for the Arts. In the face of such challenges, aspiring music professionals may find inspiration in the musicological illumination of pertinent historical case studies. This paper offers one such example via a foundational exploration of the musical career of Hungarian American violinist, conductor, and composer Frederic Balazs. Though lacking any dedicated scholarly literature to speak of, Balazs’s legacy as the first full-time conductor of the Tucson Symphony Orchestra (TSO) from 1952 to 1966 included establishing arts organizations and nourishing the classical tradition at its very grass …

The Relational Good Life: Entrepreneurship Education And Grounded Sumak Kawsay In Otavalo, Ecuador, Vanessa I. Lozano Hardman

Theses and Dissertations

Indigenous Kichwa communities in Ecuador’s Otavalo region have long participated in local and transnational markets, historically as mindalaes, specialized traders of the northern Andes. Yet in recent years, international development-oriented NGOs have framed entrepreneurship education as newly necessary for economic development. These approaches emphasize individualized narratives of vision, self-reliance, and growth, often characterizing Indigenous peoples as lacking entrepreneurial skills or the appropriate mindset. Drawing on ethnographic research with youth, mothers, and teachers at Saminay–El Legado, an agro- technical, intercultural bilingual secondary school (UECIB) in the parish of San José de Quichinche, this article examines how entrepreneurship education intersects with grounded …

Independent English Teaching In Brazil: A Case Study, Jade G. Gunca

Theses and Dissertations

This qualitative case study investigates the experiences and practices of successful independent English as a Foreign Language (EFL) teachers in Brazil who operate outside traditional schools and private language institutes. Rather than providing a broad descriptive profile, this study offers an in-depth examination of a small group of teachers. These educators frequently use social media platforms such as Instagram and Facebook to showcase communicative, personalized, and flexible instruction in response to growing learner demand. Although English is widely taught in Brazilian schools, persistent structural constraints often limit students’ development of communicative proficiency, prompting some learners to seek instruction from independent …

A Masked-Perturbation Model For Destabilization Security Games In Feedback Systems, Gabriel Michael Perry

Theses and Dissertations

In this thesis, we present a mathematical formulation for increasing cyberphysical system security. This model allows a system administrator to use assumptions about exposed signals to derive defense strategies meant to mitigate the system's vulnerability to feedback perturbation attacks. We begin with a survey of game theory with the goal of building the concepts of resource and security games. We then introduce our model, which is a security game; targets in this game are exposed signals in the model map of the system, and resources are perturbed or introduced dynamical relationships between these signals. This formulation, called the masked-perturbation model, …

Principal Coaching Impact: Elementary Principals' Perspectives On Their Coaching Experience, Kyle L. Hoopes

Theses and Dissertations

School principals face increasing complexity as they navigate instructional leadership, organizational change, and the emotional demands of supporting staff and students. Traditional professional development--often episodic and compliance-driven--has proven insufficient for helping principals translate knowledge into practice. This qualitative phenomenological study examined how 20 elementary principals in a large intermountain district experienced a dual-coach, team-based leadership coaching model and how coaching influenced their leadership practices and well-being. Semi-structured interviews and iterative thematic analysis revealed that coaching shaped three core areas of leadership practice: gaining clarity and direction, prioritizing instructional and organizational goals, and strengthening collaboration within school leadership teams. Principals also …

Self-Concept Clarity And Relationship Satisfaction: The Mediating Role Of Approach And Avoidance Motives For Sacrifice Among Heterosexual Couples, Hannah F. Hatch

Theses and Dissertations

While individuals often engage in relational sacrifice to promote positive outcomes like connection (approach motives), they may also sacrifice for a partner to avoid negative outcomes like conflict (avoidance motives). These distinct motives for sacrifice have been repeatedly linked with divergent couple outcomes, yet little is known about the personal and relational factors which shape them. The current study addressed this gap using dyadic data from 289 mixed-gender couples to examine how self-concept clarity (SCC) predicted changes in relationship satisfaction via approach and avoidance motives for sacrifice. Participants represented diverse ethnic and sociodemographic backgrounds across all demographic regions of the …

Answers “Go By Water”: Felt Knowledge As An Alternative Epistemology In Othello, Annalisa Gulbrandsen

Theses and Dissertations

William Shakespeare's Othello is fundamentally a play about epistemology--how does one know what he/she knows amidst the sea of words, evidence, and misdirection? Traditionally, the problem of knowledge in Othello has been treated as an intellectual problem of the mind. However, this thesis argues that the play purposefully draws attention to the limits of what the mind can know by way of the eye (what is seen) and ear (what is spoken or heard), instead offering an alternative epistemology that is felt through embodiment. When Desdemona's words no longer have the power to affect what Othello believes, Desdemona's answers to …