Digital Commons Network^™

Simulating Interactions Between (Remote) Internal Waves And The Background Flows And Topography Of The U.S. West Coast, Oladeji Siyanbola

Dissertations

This dissertation focuses on the simulation of remotely and locally generated semidiurnal internal tides (ITs) and near-inertial waves (NIWs), and how they interact with the California Current System (CCS) and the U.S. West Coast (USWC) topography. In Chapter II, we force Regional Ocean Modeling System (ROMS) simulations of the CCS with tides and remote internal waves (IWs) originating from as far as Hawaii, using a realistic global HYbrid Coordinate Ocean Model (HYCOM) simulation. To allow for optimal wave energy influx and minimize boundary reflections from the interior of the domain, we conduct boundary sensitivity tests on tide and IW forcing …

Structural And Functional Characterization Of The Sos Pathway Genes (Sos1, Sos2, And Sos3) In Avicennia Marina: Insights Into Salinity Stress Tolerance, Mariam Obaid Alzaabi

Dissertations

Abiotic stress is a major challenge for agricultural productivity. Salinity stress is a vital environmental constraint that significantly limits plant growth and reduces crop yield worldwide. Halophytes, such as Avicennia marina, offer unique opportunities to dissect adaptive mechanisms underlying salt tolerance. This study focuses on the structural and functional characterization of the Salt Overly Sensitive (SOS) pathway genes (SOS1, SOS2, and SOS3) from A. marina. Full-length cDNAs of AmSOS1, AmSOS2, and AmSOS3 were cloned and characterized. The sequence analysis of these genes compared to the respective orthologs revealed high similarities and conservation of all …

Student Self-Assessment Of Learning To Foster Improved Self-Reflection Of Learning And Academic Achievement, Leann Renee Doerr

Dissertations

Throughout her career and most notably post-pandemic, the scholar practitioner observed an increase in students giving up when encountering rigorous academic content and assignments. During the research process, concepts of student agency and self-regulation of learning, which were new to the scholar practitioner, came to the forefront of skills her students either lacked or needed to improve upon. Empathy generators were gathered for participants at Context School #1, which led to Student agency and self-regulation of learning becoming the center of the intervention during the design thinking process. The Self-Assessment of Learning, created and modified during the design thinking phases, …

What Factors Impact Teachers’ Beliefs About The Likelihood To Which Their Students With Intellectual And Developmental Disabilities Can Live On Campus, Jonathan Lidgus

Dissertations

After the Higher Education Opportunity Act was passed in 2008, inclusive postsecondary programs for students with intellectual disability (ID) have grown on campuses across the United States. These programs were designed to eliminate barriers that prevent students with intellectual disability from attending college in order to achieve positive employment outcomes and skills to increase independent living. While programs may be designed for those with intellectual disability, individuals may have multiple diagnoses, including intellectual and developmental disabilities (IDD). The relationship between a student and their secondary teachers can positively impact their future or present a barrier. Using the data from the …

Unleashing Excellence: Strengthening It Leaders Through Executive Coaching, Tonya S. Rivers

Dissertations

This paper explores the impact of executive coaching on Information Technology (IT) leaders. Many organizations across different industries lack strong leadership, as exposed by COVID-19. Companies aim to keep exceptional leaders and establish upbeat workplaces to achieve success. Although previous research has examined leadership effectiveness, it is still unclear how best to manage employees' perceptions of effective leadership. The goal of this research is to provide new insights into what can improve perceptions of leadership effectiveness. I explored the role executive leadership coaching has on managers working in the Information Technology (IT) field. Current literature often mentions the need for …

Longitudinal Assessment Of Blast-Related Traumatic Brain Injury (Tbi): Impact On Structural Neuroimaging Correlates, Working Memory, And Processing Speed, Carmen Velez

Dissertations

The conflicts in Afghanistan and Iraq led to a significant surge in blast-related traumatic brain injuries (bTBIs). However, our understanding of their lasting neurological impacts remains incomplete. To our knowledge, this is the first longitudinal study of its size to explore whether increasing levels of blast exposure predict neural atrophy or cognitive decline over time. We analyzed 149 baseline and follow-up data sets from service members categorized by blast exposure: blast naïve (n = 57), single blast (n = 70), and multiple blasts (n = 22). Participants underwent structural magnetic resonance imaging (MRI) and neuropsychological assessment.

All data were drawn …

Getting The Unbanked, Banked: An Adult Education Intervention Program To Increase The Usage Of The Banking System By Low-Income Families, Orlando A. Smith

Dissertations

Financial literacy describes the skills, knowledge and tools consumers use to make informed financial decisions to meet their goals. The purpose of this study was to determine how many consumers utilize the resources offered by banks and credit unions and for those who do not, after participating in an intervention, will begin to do so. The Transtheoretical Model of Behavior Change served as the theoretical framework. It has been shown to be a useful model to examine adults’ change in financial behaviors. The sample consisted of 65 adults who lived within specific zip codes in a large metropolitan area in …

Reimagining Discipline: Elementary School Counselors’ Experiences Implementing And Advocating For Restorative Practices As An Alternative To Exclusionary Discipline, Kim Kelly

Dissertations

School counselors are positioned as leaders and advocates within their school communities, playing a critical role in promoting equitable practices and systemic change. Despite decades of research indicating the harmful effects of exclusionary discipline, this approach continues to be implemented in schools across the United States. Emerging literature has indicated restorative practices as an alternative discipline approach that promotes equity, reduces disproportionality in school discipline, and fosters a positive school climate. This research focused on the experience of elementary school counselors advocating for and implementing restorative practices as an alternative to exclusionary discipline. Through a hermeneutic phenomenological and social constructivist …

Balancergnn: Balancer Graph Neural Network For Imbalanced Datasets, Mallika Boyapati

Dissertations

Addressing imbalanced datasets is challenging due to machine learning models' inclination to learn the majority class. Graph construction plays a major role in determining how Graph Neural Networks (GNNs) perform on imbalanced datasets. In this research, we introduce the BalancerGNN framework to tackle highly imbalanced datasets, demonstrating its effectiveness in fraud detection as one of the case studies. This framework is designed to work for any binary node classification dataset with significant class imbalances. This research addresses the following questions: i) How effective are feature engineering techniques in the case of imbalanced datasets? ii) How do graph representation learning and …

We Speak Life Into Their Language: Black Educators’ Approaches To Linguistic Justice In Urban Secondary Ela Classrooms, Lakeisha A. Davis

Dissertations

This study explores how Black educators navigate linguistic justice, deficit thinking, and stereotypes in urban secondary English Language Arts (ELA) classrooms. Using a hermeneutic phenomenological approach, it examines how teachers affirm Black Language (BL) while balancing the demands of White Mainstream English (WME) in academic spaces. Findings reveal that although educators employ culturally affirming strategies, they face challenges from restrictive language policies and standardized assessments. To counteract these barriers, they adopt negotiation practices that support students’ linguistic and cultural identities. From these findings, the study proposes Dynamic Linguistic Uplift (DLU)—a new theoretical framework that illustrates how Black educators sustain BL …

Warriors And Guardians: Police Recruit Role Orientation And Heterogeneity, Robert Boxerman

Dissertations

American police have experienced an expansion of duties over the last century, and their function has become increasingly diverse. As a result, researchers have developed role orientation typologies to understand how officers view themselves, their attitudes toward their work, and their responsibilities. One such typology is the warrior/guardian framework, where warrior-oriented officers see themselves as crime-fighting soldiers in conflict with criminals, while guardian-oriented officers view themselves as protectors of the community and providers of broader public services. Despite its popularity, there is limited empirical evidence supporting this framework. Further, little research examines how police recruits differentially view their role as …

Exploring The Impact Of Leadership Styles On Teacher Self-Efficacy: A Comparative Case Study Of Rural And Suburban High Schools, Stephanie Hill

Dissertations

This qualitative study examines how high school teachers in rural and suburban settings perceive their school leaders’ leadership styles, and how they influence teachers’ self-efficacy. Grounded in established leadership theories and research on teacher efficacy, this investigation aims to provide a nuanced, context-sensitive understanding of leadership dynamics within diverse educational environments. The study employs a comparative case study design, sampling from two high schools—Suburban Academy and Rural Tech High School. Data collection methods include semi-structured interviews and a questionnaire, offering multiple perspectives on leadership practices and their effects on teachers’ confidence and instructional decision-making. Ultimately, the results will contribute to …

Preservice Teachers’ Experiences With Critical Self-Reflection As A Means For Identifying Resistances To Becoming Culturally Competent: A Phenomenological Study, Susan Elaine Huff

Dissertations

Preservice teacher programs have been charged with finding ways to make programming more multiculturally inclusive due to the student population in K-12 public schools across the United States becoming increasing racially, culturally, or ethnically more diverse each year. The majority of current educational research surrounding multicultural education, explores the limited diversity in teacher education programs, understanding the cultural competency of the current teachers, and investigating discrepancies within current classroom application. There is little research that considers how preservice teachers use critical self-reflection as a tool for working with diverse student populations during clinical work in their program. Therefore, the purpose …

Identifying Universal And Language-Specific Features In Play-Based Writing Of Young Children, Shaya Helbig

Dissertations

Young children’s marks when writing consist of universal features such as scribbling and drawing, and language-specific features such as letters or letter-like forms and spaces (Clay, 1979; Puranik & Lonigan, 2011; Rowe & Wilson, 2015; Teale & Sulzby, 1985). It is widely agreed that exposure to words and written language play a pivotal role in children’s writing development (Clay, 1979; Teale & Sulzby, 1986). However, it remains unclear whether children form more complex writing skills through specific developmental stages, and if age plays any part in this progression (Clay, 1979; Justice & Vukelich, 2008; Teale & Sulzby, 1986). The lack …

Nonparametric Finite Mixture Of Ising Graphical Models, Manal Hamadi Alloqmani

Dissertations

Statistical applications in fields such as bioinformatics, genomics, speech processing, image processing, and communications often involve large-scale models in which thousands or millions of random variables are linked in complex ways. Graphical models provide a general methodology for approaching these problems, and indeed many of the models developed by researchers in these applied fields are instances of the general graphical model formalism. This formalism gives a nice framework for capturing complex dependencies among the random variables and building a large-scale model for high-dimensional data. Recently, high-dimensional data are more assumed to come from one population and follow a parametric or …

Resilient Learning For Anomaly Detection In Smart Living Systems, Sahar Abedzadeh

Dissertations

Cyber-Physical Systems (CPS) rely on anomaly-based detection methods to ensure the integrity and security of critical infrastructures such as smart grids, smart water metering systems, and advanced metering infrastructures (AMI). Anomaly detection methods are commonly used to identify deviations from normal system behavior by establishing learned profiles and thresholdbased distinctions between benign and anomalous events. However, conventional frameworks often fail to account for adversarial data poisoning attacks, unlabeled unsafe events, and environmental noise—factors that distort training data, degrade detection accuracy, and increase false alarms. This dissertation proposes a resilient learning framework that mitigates these biases by integrating quantile regression, M-estimation …

Turbulence And Energetic Ion Production In The Partially Magnetized Hollow Cathode Plume, Margaret Mary Mooney

Dissertations

Hall effect thrusters (HETs) are the most widely used electric propulsion (EP) device for in-space satellite propulsion. EP devices provide high efficiencies for extended mission lifetimes and low thrust for precision maneuvers. The hollow cathode is a critical HET component and undergoes extensive lifetime testing in addition to the lifetime testing of the full HET. Significant density gradients, non-Maxwellian electron behavior, and magnetic fields sufficiently strong enough to magnetize electrons in hollow cathode plumes create favorable conditions for the formation of plasma instabilities, which have an impact on cathode lifetime. Cathode qualification testing is typically conducted independently and includes a …

Deadtime In The Vale Of Soul-Making: Hermeneutics, Humanization, And Higher Education In Prison, Dale Michael Brown

Dissertations

This body of work examines higher education with and for justice-involved people from a descriptive, theoretical, and empirical perspective—pulling together multiple disciplines and employing different methodologies from the humanities and social sciences. The investigation is written from a philosophical perspective via educational foundations and a social science perspective via qualitative research, including an examination of carceral higher education’s connections to teaching and experiential learning. This approach reflects the interdisciplinary nature of both the author’s degree program and the topic itself, which (as a field of academic inquiry) is part theoretical and part empirical (both qualitative and quantitative). The papers in …

The Ebony Edge: A Qualitative Exploration Of Math Success Among Black College Women, April Ruiz

Dissertations

Historically, women have been underrepresented as leaders in STEM. However, according to the National Science Foundation (2022), women accounted for a little more than half of the college-educated workforce and underrepresented minority women increased in broad science and engineering occupational categories. This promising upturn underscores the importance—if progress is to continue—of better understanding why some African American women succeed in and persist with their study of college mathematics.

This study aimed to explore the experiences of Black college women attending a predominantly White institution in the Midwest, to better understand what reasons Black college women ascribe to their success in …

Counseling In The Space Between: Counselor Perceptions Of Empathy And Therapeutic Alliance During Videoconferencing-Based Teleplay Therapy Sessions, Robert M. Lima Jr

Dissertations

Children and adolescents experienced a significant increase in mental health challenges during the COVID-19 pandemic (Czeisler et al., 2020; Hertz et al., 2022; Mpofu, 2023; Oberg et al., 2022; Wilkins et al., 2023). With health facilities closed for non-emergent patients, telemental health therapy offered the possibility of support for those experiencing mental health challenges (Chiauzzi et al., 2020; Cooke et al., 2020; Karimi et al., 2022; E. C. Lee et al., 2023; Racine et al., 2020). While numerous past studies conducted over several years confirmed the efficacy of telemental health counseling (e.g., Feijt et al., 2020; Gloff et al., 2015; …

An Investigation Into The Effectiveness Of High School Models Of Instruction In English Language Arts For Exceptional Education Standard Diploma Students, Lori A. Rath Minton

Dissertations

This study examined the effectiveness of high school instructional models in English Language Arts (ELA) for Exceptional Student Education (ESE) students pursuing a standard diploma. The purpose was to compare self-contained and inclusion models within the framework of the Individuals with Disabilities Education Act (IDEA), emphasizing Free and Appropriate Public Education (FAPE) and the Least Restrictive Environment (LRE). The research was conducted in a medium-sized rural district high school.

The overarching research question was: Based on student test scores, ESSA data, surveys, and interviews with content area teachers, ESE teachers, paraprofessionals, support facilitators, and administrators, how effective are self-contained and …

Measurement Of Groundwater And Contaminant Fluxes In Fractures Using A Combined System Of Passive Flux Meter And Multiport Sampler, Qasim Raza Khan

Dissertations

Groundwater and contaminant movement in fractured rock aquifers is highly variable. Its dependence on fracture apertures and orientation as well as fracture network interconnectivity is not well understood. This poses a challenge to the measurement of groundwater and contaminant fluxes, especially when using open-hole techniques, which significantly alter natural flow conditions by connecting different fractures along an open borehole or a well. Hence, downhole techniques to directly measure groundwater fluxes and map fractures' locations, orientations, and apertures are considered valuable tools. In this work, the use of Fractured Rock Passive Flux Meter (FRPFM) with invisible tracer and visible dye component …

Overcoming Motor Imagery Bci Illiteracy: Adaptive Decoding And Knowledge Transfer In Eeg-Based Brain-Computer Interfaces, Zaid Shuqfa

Dissertations

Brain–computer interfaces (BCIs), also known as brain–machine interfaces (BMIs), enable direct communication between the brain and external devices without the involvement of peripheral nerves or muscles. Among various BCI paradigms, motor imagery (MI)–based BCIs are particularly appealing due to their intuitive, cue-independent nature, allowing users to issue control commands at will. MI–BCIs hold substantial promise for improving the quality of life of individuals with motor impairments, as well as enhancing hands-free control for healthy users. However, their widespread adoption remains limited by challenges such as low signal-to-noise ratio, inter- and intra-subject variability, and the need for frequent calibration. These challenges …

How New Mathematics Teachers Develop Teacher-Student Relational Pedagogy, Dustin Kinser

Dissertations

This study investigated the support structures implemented with new mathematics teachers to help them build relational pedagogy with their students to determine their effectiveness. The literature review examines topical research, gaps in literature and theoretical frameworks to justify the study. The case study investigated new math teachers and their processes of building positive teacher-student relationships using the support structures that they were taught on their way to becoming a teacher. Math teachers were interviewed to find any common themes across the study and find out what is truly working or not working so that the process can be improved. Another …

The Cellular Trafficking And Targeting Of Angiotensin-Converting-Enzyme-2 (Ace2) And Neutral-Amino-Acid-Transporter (B0at1) Variants: Implications For The Pathogenesis Of Associated Diseases And Therapy, Nesreen Fayyad Alkhofash

Dissertations

Angiotensin-converting enzyme 2 (ACE2) and the neutral amino acid transporter B0AT1, encoded by SLC6A19, are membrane proteins with pivotal roles in human physiology. ACE2 is involved in regulating blood pressure and serves as the cellular entry receptor for SARS-CoV-2, while B0AT1 facilitates amino acid absorption in the intestine. The interplay between ACE2 and B0AT1, particularly their physical interaction and co-expression in the intestine, underscores their relevance in both normal physiology and disease. Dysregulation of these proteins has been implicated in conditions such as hypertension, and Hartnup disease and they have been usurped by SARS-CoV-2 to cause COVID-19. Despite their …

Exploring Date Pomace As A Functional Ingredient In Bread: Nutritional And Functional Properties, Alaa Almoumen

Dissertations

This study investigated the incorporation of desugared date fruit pomace into wheat bread rolls and evaluated its effects on dough handling, bread quality, staling behavior, sensory acceptability, and nutritional composition. The research was conducted in three experimental phases: (i) development and characterization of a high-fiber dietary ingredient (HFDI) from date pomace, including its physicochemical and functional properties; (ii) bread fortification and quality assessment, where wheat flour was partially replaced with 0–20% HFDI to evaluate its effects on dough rheology, bread texture, color, moisture retention, shelf life, and consumer acceptance; and (iii) nutritional and physiological evaluation of the fortified breads, including …

A Mixed Methods Design-Based Study Of Effective Supports Provided By School Administrators To Increase Trust Among Special Education Staff, Margaret Dyer

Dissertations

The scholar-practitioner used a mixed-methods design-based study to address the problem of increased teacher attrition in the field of special education. The problem was an urgent issue within the schools the scholar-practitioner supervised as the special education coordinator. The symptoms the scholar-practitioner observed within the problem of practice were a lack of collegiality among staff. The behaviors observed demonstrated that special education teachers were visibly stressed. Due to the critical importance of quality teaching on student success, the scholar-practitioner believed the problem of increased attrition among special educators was urgent. The study took place in St. Louis County, Missouri, where …

High School Students' Mathematics Experiences And Mathematics Learner Identities In A Rural Georgia Town: A Qualitative Study Using Autophotography With Photo-Elicitation, Wesley Cooper

Dissertations

This study examines the mathematics experiences (MEs) and mathematics learner identities (MLIs) of high school students in a rural Georgia town, addressing the underrepresentation of rural perspectives in mathematics education through an asset-based lens. Using autophotography with photo-elicitation, ten participants captured images reflecting their MEs, MLIs, and recommendations for improvement. Semi-structured interviews and focus groups along with two mini-cases amplified participant voices, guided by the frameworks of Four Faces of Mathematics Learner Identity (4F), Content Learning and Identity Construction (CLIC), and Critical Rural Theory (CRuT). Findings highlight how rural students’ MEs and MLIs are shaped by both the strengths of …

Enhancing Interoperability In Geospatial Analytics Systems: Navigating Diverse Standards For Optimal Data Integrity, Justin W. Bennett

Dissertations

In this study, we explore the domain of geospatial analytics, focusing on how different geographic information systems (GIS) and technology solutions can better communicate and maximize interoperability. Central to our study is the impact of this interoperability on data integrity, which is critical for accurate decision-making in domains like urban planning, environmental management, and national security. Accurate decision-making requires modeling ecosystems that are easy to comprehend and are often intricate due to their physical or artificial nature and the diversity of geospatial parameters; therefore, it is essential to gather a comprehensive array of spatial and temporal measurements. We examine the …

An Interpretive Phenomenological Analysis Of Counselor's Experience Of Breathwork And Its Impact On Their Therapeutic Practice, Jennifer Zúñiga Agüero

Dissertations

Breathwork, a transpersonal and experiential approach to psychotherapy, has been used for healing and transformation throughout the years. When applied in clinical practice, breathwork can serve as a conduit to access nonordinary states of consciousness for self-exploration and transformation. Traditional psychotherapy does not engage with nonordinary states of consciousness as part of the therapeutic process; thus, research in relation to counselors’ experiences of breathwork and their impact on therapeutic practice has yet to be explored.

Counselors’ experiences of breathwork and the influence they have in clinical practice is the phenomena explored in this research study. Exploring counselor experience with a …