Digital Commons Network^™

Emission Behavior At The Single Emitter Scale From A Porous Media Ionic Liquid Ion Source, Thomas Victor Kerber

Dissertations

Ionic liquid ion sources (ILIS) are being developed as one solution to fill a technology gap in low power, high efficiency, high specific impulse space propulsion systems. With a sufficiently intense electric field applied between an emitter electrode and an extractor electrode, charged particles are extracted from the fluid surface and accelerated out of the thruster. In this work, three experimental campaigns examine emission behavior of a single emitter ILIS made of porous material that allows passive propellant feed via capillary action of the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate (EMI-BF₄).

Repeated measurements of the emitter and extractor current as …

Development Of Al Ain Flash Flood Risk Maps\ Utilizing High-Resolution And Accurate Remote Sensing Data, Khaled Khamis Al Arfati

Dissertations

Al Ain City has undergone significant land use transformations from 1992 to 2022, marked by a population increase of over 50% and extensive development activities. This period has seen the construction of new residential areas, infrastructure, and commercial establishments, as well as enhancements to green spaces. An analysis of the Digital Terrain Model (DTM) revealed an 83% alteration in the terrain due to urbanization and shifting sand dunes, with most elevation changes under 5 meters.

The primary aim of this dissertation is to develop accurate flash flood risk maps for

Al Ain using high-resolution remote sensing data. This research highlights …

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 The Relationships Between G2g, G2e And G2c E-Government Interactions And Organizational Readiness For Citizen Centricity In The Uae Government: Organizational Culture As A Moderator, Esam Al Sayed Ahmed

Dissertations

The UAE has topped the e-Gov development rankings globally over the last two decades. But during the era of the COVID-19 pandemic, certain problems befell the model of e-Gov, like no coherent strategy, inconsistencies in digital practice, inadequate collaboration, the lack of mechanisms for innovation, poor digital talent, and concerns with public trust. After the pandemic, the government released its digital strategy (2021-2025) as part of the rapid recovery plan to stimulate the economy and society. The strategy aimed at increasing sustainability and innovation and putting citizens first. Yet, the strategy can be improved in regard to how prepared government …

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 …

The Epidemiology Of Major Congenital Anomalies In The United Arab Emirates: The Mutaba'ah Study, Hiba Mahdi Adam

Dissertations

Major Congenital Anomalies (MCAs) are significant contributors to perinatal morbidity and mortality. The absence of clear baseline prevalence data for MCAs hinders the development of targeted interventions to mitigate their burden. Furthermore, studies on adverse obstetric and birth outcomes in pregnancies complicated by MCAs are scarce, emphasizing the need for research to enhance management strategies. This dissertation aimed to: (1) estimate the live birth prevalence of perinatally diagnosed MCAs and describe study population characteristics by MCA status, (2) investigate the impact of MCAs on fetal presentation and delivery mode, and (3) investigate the impact of MCAs on preterm and low …

From Microplastic Impact To Biodegradation Solutions: Investigating Microplastic Pollution, Microbial Responses, And Efficacy Of Synthetic Microbial Consortia In Plastic Degradation, Rener Sahot De Jesus

Dissertations

Plastics, including microplastics, pose significant environmental threats due to their widespread presence and harmful ecological effects. This dissertation present three distinct, yet interconnected studies. First, a study on microplastic contamination in urban recreational parks was conducted in Al Ain, United Arab Emirates. Results showed that low-density microplastics were present in 87% of soil samples, with spectroscopic analysis identifying synthetic polymers such as polyethylene and polypropylene. Additionally, these microplastics were found to negatively affect soil pH and moisture levels, emphasizing the need for enhanced monitoring and management strategies. Second, the effects of ground microplastics on Photobacterium leiognathi strains, a marine luminous …

Investigating The Proviral And Immunogenic Effects Of Sars-Cov-2 Accessory Protein 7a, Grant Michael Hawkins

Dissertations

SARS-CoV-2 and related sarbecoviruses encode a set of accessory proteins (3a, 3b, 6, 7a, 7b, 8, 9b, and 10) that control host responses to infection and promote virus growth. Of these accessory proteins, 7a is set apart by its intracellular localization near coronavirus (CoV) budding sites and its incorporation into secreted virions. Initial studies utilizing a virus-like particle (VLP) system identified significant proviral effects mediated by 7a, but the system lacked the context of an actual CoV infection. To investigate 7a functions during CoV infections, we constructed recombinant Mouse Hepatitis Viruses (rMHV strain A59) that express 7a genes. Comparative infections …

The Role Of Teacher Leaders In Sustaining School Culture During Principal Transitions: A Case Study, Leah Curtright

Dissertations

This qualitative case study explored the lived experiences of eight teacher leaders at a public high school navigating rapid principal turnover, with five principals in 36 months. It sought to understand their perceived roles in maintaining school stability, focusing on how they countered adverse effects on culture, morale, and achievement. Data collection involved semi-structured interviews with eight teacher leaders. After the interviews were transcribed and codes identified, four themes emerged. The findings were aligned with the frameworks of this study: Eco-leadership, Distributed Leadership, and Teacher Leadership. Findings indicated that teacher leaders actively attempted to mitigate the adverse effects of principal …

Examining Rural High School Students’ Perceptions Toward And Experiences With The Reading Plus Intervention Program: A Qualitative Case Study, Deshonda Wolfe

Dissertations

Reading is the gateway to all other academic skills and across all disciplines of learning. Content courses at the high school level central focus are on reading to learn core curriculum verses learning to read. However, research shows that if students read significantly behind their typical peers, the reading gap widens throughout high school. Learning is stalled, and access to other contents, curriculums, and instructions becomes limited. To address the reading proficiency gap of high school students struggling to read in grade level, school districts have turned to computer assisted interventions programs, such as Reading Plus, to combat the reading …

Anchored Networks: Navigating Formal And Informal Pathways To Access Educational Resources In Transient And Military Families, Lara Ray

Dissertations

This study examines how Navy families in San Diego establish and use formal and informal networks to access educational resources for their children following relocation. Grounded in social capital theory, the research employed a multiple-case study approach, integrating data from interviews, focus groups, and digital analysis of Navy-affiliated social media platforms. The study explores how parents navigate these networks to promote their children’s academic success, with particular attention to key decision-making moments, resource negotiation, and equity considerations. Participants included Navy spouses from diverse ranks (E-3 to O-6) and socioeconomic backgrounds, providing insight into disparities in resource access. Findings reveal that …

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 …

Domino Effect: A Case Study On The Impact Of Education Legislation On The Emotions, Self-Efficacy, Job Satisfaction, And Retention Of English Language Arts Teachers In A Rural Middle School, Melinda Palmer

Dissertations

This multiple case study uses the appraisal theory of emotions to examine how Georgia education legislation, the Georgia Parents’ Bill of Rights and Senate Bill 226, impacted the emotional experiences, self-efficacy, and job satisfaction of ELA teachers in a rural middle school. This study also examines how this legislation impacted the retention of ELA teachers at the site school. The study highlights the experiences of 3 veteran teachers who were teaching ELA during the year immediately following the passage of the legislation. The findings indicate that the subsequent procedural changes initiated unpleasant emotional experiences: anger associated with the loss of …

Middle School Teacher Perceptions Of Digital Game-Based Learning In A 1:1 School District, Brennen Knight

Dissertations

This study examines middle school teachers' perceptions of Digital Game-Based Learning (DGBL) within a 1:1 school district. In this district, each student is provided with a personal digital device. With the increasing integration of technology in education, DGBL has been recognized as a tool that enhances student engagement, fosters differentiated learning, and improves achievement. However, despite its potential benefits, teacher adoption of DGBL varies widely due to personal beliefs, pedagogical challenges, and institutional barriers. Guided by the Technology Acceptance Model (TAM) and Rogers’ Diffusion of Innovation Theory, this qualitative multiple-case study explores how middle school teachers perceive, implement, and what …

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 …

The Lived Experiences Of Disabled Students In Inclusive Classrooms, Tanner Mizel

Dissertations

This dissertation explores the lived experiences of disabled students in inclusive classrooms, with a focus on those participating in extensive support needs (ESN) programs. Intentionally inclusive of students who communicate through diverse methods, including augmentative and alternative communication devices, picture exchange communication systems, American Sign Language, and other nonspoken forms, this phenomenological case study centers the perspectives of students in one middle school’s ESN program through mobile interviews and reflective document analysis. Student perspectives are triangulated through surveys reflecting the perspectives of parents, guardians, and school staff. Grounded in disability studies in education, this study challenges deficit-based approaches to inclusive …

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 …

A Phenomenological Study Of Southern California Charter School Leaders’ Perceptions Of Creating An Inclusive School Culture, Barbara Hale

Dissertations

Purpose: The purpose of this phenomenological study was to identify and describe the culturally responsive leadership practices that charter school leaders use to create a culture of inclusiveness. A second purpose of the study was to identify and describe the supports and barriers charter school leaders perceive affect the development of a culture of inclusiveness for students. Methodology: This study identified and described the culturally responsive leadership practices implemented by charter school leaders to create a culture of inclusiveness and identify the supports and barriers the leaders perceived to affect the development of the inclusive culture. I interviewed 10 participants …

Adaptive Leadership: Strategies Used By U.S. Navy Command Senior Enlisted Leaders To Build Adaptive Capacity In Times Of Great Change, Derek Wayne King

Dissertations

Purpose: The purpose of this phenomenological study was to identify and describe strategies used by U.S. Navy command senior enlisted leaders (CSELs) to build an adaptive capacity based on the five key characteristics of adaptive leadership identified by Heifetz et al. (2009).Methodology: This phenomenological study explored the lived experiences of U.S. Navy CSELs. Purposeful, convenience sampling was used to identify 10 participants who met the study’s criteria. The semistructured, open-ended interview protocol was developed by a thematic research team of nine peer researchers and three faculty advisors. Data collected from the interviews and artifacts were analyzed to identify themes related …

Examining The Value Of Industry-Recognized Certifications In Illinois Secondary Career And Technical Education Programs, Nancy Awdziejczyk

Dissertations

The goal of career and technical education (CTE) is to equip students for success in postsecondary education and the workforce. This study investigated the integration and impact of industry-recognized certifications (IRCs) within CTE programs in Illinois, particularly within the framework of Perkins V legislation. The research aimed to determine how IRCs enhance employability, increase starting salaries, and support career advancement for high school students through aligning CTE curricula with the demands of the current labor market.

The study was initiated due to difficulties in identifying valuable certifications for CTE programs stemming from the excessive number of certifying organizations and unclear …

Assessing Alexithymia In Law Enforcement: The Role Of Service Tenure And Sex, Elfego J. Gallardo Jr

Dissertations

ABSTRACT

Alexithymia, characterized by difficulties in identifying and expressing emotions, has significant implications for professions requiring emotional intelligence and trauma-informed response. Law enforcement officers routinely navigate high-stress encounters that demand emotional regulation, clear communication, and empathy, yet those with alexithymic traits may struggle in these areas, potentially affecting interactions with victims, suspects, and the community. This study examined the prevalence of alexithymia among front-line police officers in suburban municipal agencies within the Chicago metropolitan area, using the Toronto Alexithymia Scale-20 (TAS-20) as a standardized assessment. The research addressed three questions: (1) What proportion of officers exhibited normative or elevated levels …

A Comparison Of The Factors That Affect Graduation Rates Of Students Enrolled In Dropout Prevention Programs, Catina R. Thomason

Dissertations

The purpose of this study was to compare the factors that affected the graduation rates of students enrolled in five charter high school dropout prevention programs that utilized the same online accelerated curriculum model. The overarching research question was: what factors affected the graduation rates of students enrolled in dropout prevention programs? A mixed methods design was employed to evaluate extant data on graduation rates and attendance rates surveys and semistructured interviews were completed by administrators and teachers to compare data across the five schools. This approach allowed for a comprehensive analysis of both quantitative and qualitative data, providing a …

Role-Ing While Bipoc: Understanding The Experiences Of Table Top Role Playing Game Players Of Color, Jordan K. Posey

Dissertations

In 2015, controversy surrounded the interactive computer game Mission US: Flight to Freedom. The game was unveiled as an accessible way to teach about American chattel slavery by mixing elements normally associated with roleplaying games (RPGs), Tabletop Roleplaying Games (TTRPGs), and social studies curriculum. The conversations surrounding the game exemplify the complicated history of RPGS/TTRPGs and the limitations of gamification in educational settings. This qualitative study aimed to analyze aspects of gaming culture through a critical race lens by documenting the experiences of Tabletop Roleplaying Game (TTRPG) players identifying as Black, Indigenous, and a Person of Color (BIPOC). Using a …

Sustained Effects Of Reading Recovery®: Beyond The Intervention, Dr. Lisa A. Fisher

Dissertations

The purpose of this study was to conduct a longitudinal analysis of the sustained effects of Reading Recovery® on literacy achievement beyond the initial intervention period. It examines the program’s long-term effectiveness, assessing whether early literacy gains are maintained and identifying key factors that contribute to sustained progress. This study, titled “Sustained Effects of Reading Recovery®: Beyond the Intervention,” seeks to fill a critical gap in existing research by providing insights into the extended impact of this early literacy intervention.

A longitudinal, mixed-methods approach was employed, incorporating quantitative data analysis and qualitative insights from educators and administrators. The study was …

Does Artificial Intelligence Bias Exist In Mortgage Underwriting Software? Investigating Bias, Regional Disparities, And Fair Ai Models, Dorian Cornelius

Dissertations

This quantitative study closely emulated Zou and Khern's (2022) analysis of AI Bias in Mortgage Applications. They used the Home Mortgage Disclosure Act (HMDA) dataset from the Federal Financial Institution Examination Council's (FFEIC) website to review mortgage loan data from 2019 to determine if there was bias in the AI mortgage application approvals. Those researchers concluded that bias does exist in the AI mortgage underwriting software. Since their study, research has demonstrated that discrimination continues to exist in AI software. Therefore, this research expands on Zou and Khern’s study to determine if there are differences in the mortgage loan approval …

Bridging Learning Gaps: Enhancing Student Success Through Multi-Tiered Systems Of Support, Kimberly C. Mott

Dissertations

As students arrive at school with more and more diverse needs, due to different and sometimes traumatic life experiences, the obstacles students must overcome to be ready to learn are oftentimes unsurmountable. However, as an experienced educator, the scholar-practitioner has observed that students demonstrate academic growth when the whole child's needs (academic, attendance, behavioral/social-emotional) are regularly observed, measured, addressed, and progress monitored. This quantitative study aimed to examine the influence and effectiveness of implementing multi-tiered systems of support (MTSS) with fidelity. The scholar-practitioner used two data points to determine the effectiveness of a prescriptive embedded MTSS professional development. The first …

Assessing Psychologists’ Clinical Knowledge Of Geriatric Depression: A Validation Study Of The Later Life Depression Knowledge Questionnaire, Abigail J. Laine

Dissertations

Because the US population is rapidly aging, generalist clinicians will increasingly be called upon to provide mental health services to older adults. Unfortunately, most generalist clinicians do not possess the specialized knowledge to provide clinical services to this population and will require training. Professional training efforts are currently hindered by the lack of psychometrically supported scales of clinical disorders specific to aging. Without such scales, it is difficult to evaluate the impact of continuing education programs. The purpose of the present study was to investigate the psychometric properties and scale dimensionality of the Later Life Depression Knowledge Questionnaire (LLD-KQ), a …

Primal Leadership In Healthcare: A Phenomenological Study Of Emergency Medicine Physicians And Their Perspective On Effective Leadership, Zoe Zaidi

Dissertations

Purpose: The purpose of this qualitative study was to identify and describe how emergency medicine (EM) physicians in leadership roles use the six EI leadership competencies related to relationship management (inspiration, influence, developing others, change catalyst, conflict management, and teamwork and collaboration) to lead teams and accomplish effective results. Methodology: This phenomenological study described the lived experiences of emergency medicine (EM) physician leaders in San Bernadino, Riverside, and Orange counties in Southern California. The participants were selected through nonprobability purposeful sampling and met the criteria “as leaders” for achieving effective results. Data were collected through semistructured interview questions and analysis …

Leadership Practices For High-Performing Teams: Insights From Senior Military General Officers And Flag Officers, Kimberly Mitchell

Dissertations

Purpose: The purpose of this mixed methods study was to identify and describe how senior military general officers and flag officers (GOFOs) used the three competencies of high-performance teams (HPTs; clarity, connection, and communication) to achieve objectives in their organizations. The second purpose of this study was to determine the degree of importance that senior military GOFOs perceived the three high-performance team effect (HPTE) core competencies impacted their leadership for creating HPTs.

Methodology: This mixed methods study identified and described nine senior military officers’ perceptions of strategies to lead HPTs while focusing on the three core competencies: clarity, connection, and …

Intimate Partner Violence Screening Education For Nurses In Emergency Department, Martha I. Wydra

Dissertations

This quality improvement project aims to increase nurses' knowledge, confidence, and skills in IPV assessment in the ER using an education program and the PREMIS tool.