Digital Commons Network^™

A Framework For Identifying Transit Deserts In Rural Areas With Demand-Response Transit Services, Agnes L. Barnwell

Dissertations

The primary objective of this research is to develop a comprehensive framework for identifying transit deserts in rural areas with Demand Response Transit (DRT) services. This framework will focus on marginalized rural areas in Alabama, providing a foundation for better understanding their transportation needs. The research gap regarding transit deserts in rural areas is significant. While the concept of transit deserts has been explored in urban settings, rural areas with DRT services remain largely under-researched. Addressing this gap is vital for establishing equitable access to transit services across rural areas. This research contributes to the existing body of literature in …

Nonlinear Dynamics Of Acoustic Fluctuations In One-Dimensional Ducts With And Without Unsteady Combustion, Swarnalatha Kathalagiri Vasantha Kumar

Dissertations

The overall objective of this research is to analyze the nonlinear dynamics of combustors in one dimensional Cartesian coordinate. This research was carried out in four parts, with each successive part building on the previous one. The first part begins with investigation of the coupled nonlinear evolution of acoustic modes in a quasi 1-D duct with axially inhomogeneous mean velocity and mean thermodynamic properties. A novel modification of the Krylov--Bogoliubov method of averaging (KBMA) is developed to analytically solve the modal-amplitude equations that are linearly and nonlinearly coupled with both quadratic and cubic nonlinearities. Approximate analytical solutions based on the …

Liner Implosion Of Magneto-Inertial Fusion Plasmas Across The Periodic Table, Brian Dale Taylor

Dissertations

The goal of achieving net energy production from fusion reactions would have many positive and transformational impacts upon society and is therefore of great interest. Magneto-Inertial Fusion may be a path to achieving the high energy density requirements. One possible method for reaching the necessary plasma conditions is through a z-pinch driving a magnetized liner to compress and heat the fusion fuel. Progress has been made through both modeling and experiment, largely through Sandia National Laboratories, in recent years in developing this process and achieving neutron yields in the range of 1013 neutrons per pulse. Magnetized liner z-pinch experiments have …

Analysis Of A Magnetically Enhanced Microwave Powered Split-Ring Resonator Plasma Source For Micropropulsion, Andrew Walsten

Dissertations

This work focuses on better understanding split-ring resonators (SRRs) as plasma devices and exploring their use as a plasma source in a two-stage Hall thruster. This is done by first studying the effect of a single versus a coupled SRR on plasma production. Through the use of simulations in ANSYS HFSS and Langmuir probe measurements, it is found that coupled SRRs result in a more uniform plasma at higher pressures due to the introduction of a secondary ionization point, and the electromagnetic coupling resulting in a slightly stronger electric field being produced at the primary gap. Experiments were also done …

Evaluating The Susceptibility Of The Lew.1wr1 Rat To Glucose Intolerance, Insulin Resistance, And Masld : Is Fat10 The Key?, Quiana Claudette Wilkerson Vidal

Dissertations

Obesity is an epidemic that affects over 40% of adults in America. Obesity can be divided into metabolically healthy and metabolically unhealthy obesity, with the latter being characterized by symptoms closely associated with metabolic syndrome, type 2 diabetes, and metabolic dysfunction-associated steatotic liver disease (MASLD). What causes the transition from metabolically healthy to metabolically unhealthy obesity is not fully known. Further, it is unclear how this transition correlates with the onset of co-morbid conditions. We propose that Ubiquitin D (FAT10) may play a role in transitioning into a metabolically unhealthy state in response to obesity. This dissertation evaluated two main …

Experimental Investigation Of Steady And Unsteady Effects Of A Circulation Control Wing With Spanwise Segmented Blowing, Tulasi Ram Vechalapu

Dissertations

Active Flow Control (AFC) techniques are a class of methods that improve aerodynamic efficiency by affecting the flow field through actuation or interaction to produce a desired change in flow behavior. Circulation control (CC), which is considered one of the most effective AFC methods, holds significant potential to enhance aircraft efficiency and has been researched for lift enhancement and boundary layer control, among other applications. However, its practical application has been constrained by high mass flow requirements and several unanswered questions in current research. A critical area of investigation is the interaction between trailing-edge blowing and 3D unsteady effects under …

The Role Of Surface Processes In Modulating Land-Sea Breeze Circulation : An Observational And Numerical Modeling Study In Java, Georgios Priftis

Dissertations

In the Maritime Continent (MC), sea and land breezes (SLB), shaped by its numerous islands, are key drivers of the tropical climate. Island morphology, terrain, land cover, and orientation relative to prevailing winds affect these breezes and associated convection. While research has largely focused on larger islands, smaller islands like Java remain understudied. Java features a mountainous chain with several gaps and experienced significant land use and land cover changes (∆LULC) over the past two decades. This dissertation aims to: 1) adapt observational methods to detect mesoscale boundaries in numerical models, 2) analyze the role of Java’s topography and cloud- …

Unveiling The Mechanisms Of Bromate Formation And Nom Treatment In Drinking Water Via Plasmon-Enhanced Catalytic Ozonation, Amir Ahmadi Zahrani

Dissertations

High energy consumption and the formation of harmful byproducts are significant challenges in advanced oxidation processes (AOPs). While much research has focused on improving treatment efficiency, controlling byproduct formation requires more attention. The focus of this dissertation is divided into three main focuses: Firstly, the underlying mechanism of bromate formation inhibition during a plasmon-enhanced catalytic ozonation (PE catalytic ozonation) process using silver-doped spinel ferrite (0.5wt%Ag/MnFe2O4) as the catalyst was investigated by scrutinizing the effects of each factors involved in PE catalytic ozonation including irradiation, catalyst, and ozone, both individually and in combination, on major bromine species involved in bromate formation. …

Nuclear Fission Rovers For Martian Exploration, Alexander Constantine Bendoyro

Dissertations

A comprehensive analysis was performed on the impact of embedding a Kilopower-style fission reactor into a pressurized rover on architectural performance for a sample lunar, Mars opposition, and Mars conjunction mission. The high gamma ray flux necessitated the addition of substantial shielding for the crew. A single material shielding analysis using the Taylor formulation revealed that varying the distance between the crew and the reactor core from 3 m to 6 m reduced the required shielding thickness by 7%. Increasing the power output of the reactor from 3.4 kWe (comparable to radioisotope power capability) up to 10 kWe (Kilopower design …

A Design Team’S Perspective-Mixing For Shared Empathic Understandings, Eunhye Kim, Robin Adams, Senay Purzer

School of Engineering Education Faculty Publications

Empathic design involves two social practices – collaboration with users and intra team collaboration forshared empathic understandings. This study is focused on the latter phenomenon, aiming to characterise a social mechanism underlying it. To achieve this objective, we used a framework of perspective-mixing in empathic design, including three distinct perspectives: first, second, and third-person perspectives. With this framework, we traced how team members share and integrate individuals’ user knowledge and insights to develop and apply their shared empathic understandings. We conducted conversation analysis to examine one design team’s conversations over a design journey from need-finding to initial ideation to prototyping …

Rising From The Dust: (In)Visible Women In Australian Mining, Angela Webb

Postgraduate

Artivism (Art + Activism) has effectively raised awareness, challenged societal norms, and catalysed change through creative expression. Deepwell (2020) noted that “art engages with feminist politics” and “feminist politics reinvents art”. Deepwell's statement emphasises the mutual influence and transformative power between art and feminist politics. Art serves as a vehicle for expressing and advancing feminist ideologies, while feminist politics, in turn, reshapes artistic practices, content, and perspectives, ultimately contributing to a more inclusive and diverse art discourse. (EXTRACT taken from page 2 of exergesis)

Development Of Leader Voice And Leader Silence Scales: How And Why Leaders Choose To Remain Silent Or Speak Up During Situations Of Workplace Aggression, Katherine L. Dickins

Theses and Dissertations

This study aimed to investigate the factors that drive leaders to speak up or remain silent when witnessing workplace aggression and to develop scales to measure leader voice and leader silence. While research on employee voice and silence exists, leader voice and silence need more theoretical development. I used an exploratory sequential mixed-method design to address these gaps. Subjects: Study one included 26 graduate management students and 35 leaders across multiple industries in the United States who witnessed workplace aggression in their unit. Study 2 included 345 people who supervised others at work. Instruments: Seven open-ended questions asking respondents to …

Building Resilience, Navigating Crises Since 2019: A Phenomenological Study Of Leadership Factors Influencing Retail Business Owners In Lebanon, Mira Fadel

Theses and Dissertations

The Lebanese population and culture are recognized for their resilience when facing adversity withstanding events such as the Lebanese Civil War, and multiple country invasions. The purpose of this study was to explore the lived experiences of retail business owners from different geographical regions and retail types in Lebanon and to identify the leadership factors that kept them resilient while navigating the compounding crises since 2019. The leadership factors included leadership styles, strategies, and agility. The conceptual framework encompassed all leadership factors, the retail industry, cultural context, and resilience. Data for this hermeneutic phenomenology was collected through semi-structured interviews followed …

Photovoice As A Reflective Pedagogy For Undergraduate Community Psychology Students, Shereé Bielecki

Theses and Dissertations

This descriptive qualitative study was designed to understand the experiences of former Community Psychology (CP) undergraduate students who participated in a degree program at a California university. The purpose of this qualitative study is to explore how former Community Psychology undergraduate students describe their experiences using reflective Photovoice activities to learn about and become involved in social justice. The theoretical frameworks that informed this study were in social justice theory, pedagogical practices related to teaching social justice using Photovoice, and the practice of self-reflection in college classrooms. Two primary research questions guide the inquiry: 1) How do former Community Psychology …

Examining The Experiences Of Dei Practitioners: A Look At The Racial Disparity In Policing Of Black People And The Subsequent Need For Adaptive Leadership, Lashawn Taylor

Theses and Dissertations

For centuries, Black people in the U.S. have had to navigate structural and institutional racism. This is especially true for the system of policing, which evolved from pre-emancipation slave patrols. Though law enforcement agencies have made strides in the past 160 years, Black people continue to be targeted and killed by police at a disproportionate rate. Evidence shows that DEI training initiatives within policing often fail to reduce this racial disparity that exists in policing. Yet, improved training outcomes surrounding racial relations continues to be a priority. The purpose of this qualitative, phenomenological study was to examine the experiences of …

Exploring The Relationship Between Adverse Childhood Experiences And Suicidality In College And University Students: A Systematic Review, Tatyana Aposhian

Theses and Dissertations

Adverse childhood experiences (ACEs) and suicidality are highly prevalent and increasing social problems among the college and university student population, thereby underscoring a need to better understand the relationship between ACEs and suicidal risk, ideation, and attempts during college. There is also a need to examine current suicide prevention and intervention programs for the extent to which they are ACE- and/or trauma-informed. The purpose of this quantitative systematic review with narrative synthesis is to elucidate findings regarding the relationship between ACEs and suicidality in undergraduate and graduate students across the globe and provide recommendations for future ACE-informed suicide prevention and …

Examining Women’S Persistence In Stem: A Mixed Methods Study Of Autonomy, Competence, Relatedness, And Sociocultural Influences On Women In Science, Technology, Engineering, And Mathematics, Heather Midori Saigo

Theses and Dissertations

Several decades of effort have improved the participation of women in science, technology, engineering, and mathematics (STEM), but the gender gap remains. Researchers have found diverse reasons for women’s underrepresentation in STEM, but less is understood about factors supporting persistence. This study’s purpose was to understand how women persist in STEM, through the lens of self-determination theory. Self-determination theory posits that persistence improves when one’s needs for autonomy, competence, and relatedness are satisfied. This embedded mixed methods study provides evidence of how autonomy, competence, relatedness, and sociocultural factors influence women’s persistence in STEM. Using network and snowball sampling, the researcher …

Exploring The Impact Of The Covid-19 Pandemic On Adolescent Mental Health: An Integrative Systematic Review, Ruth Maouda

Theses and Dissertations

An integrative systematic review was conducted to understand the potential impact of the COVID-19 pandemic on adolescent mental health and to identify what contributing risk and protective factors increased or decreased the likelihood that these mental health outcomes were experienced among adolescents, including those from diverse and vulnerable communities. Furthermore, this review examined interventions and coping strategies identified within the literature that were beneficial in mitigating these harmful pandemic-related effects. Methods. Data was collected from five electronic databases and included peer-reviewed, English-language articles published between 2020-present in the United States, comprised of adolescent participants aged 11-19. All studies were required …

Psychosocial Factors Impacting Identity Development In Biracial-Biethnic Youth: A Socioecological Analysis, Melanie S. David

Theses and Dissertations

A mixed methods systematic review with socioecological analysis was conducted to identify specific psychosocial factors impacting identity development and well-being and biracial-biethnic youth. Findings from this review aimed to summarize and synthesize the most recent research literature on biracial-biethnic youth, with particular attention to factors contributing to negative identity development, psychosocial stressors (e.g., substance use) that impact both identity and well-being, and protective factors that promote well-being. This systematic review also aimed to utilize a socioecological framework to better understand on what level these psychosocial factors occur and the interaction between the individual and the larger environment. Methods. Data was …

Perceptions Of Classroom Technology Use Among Adult English Learners, Mandy Chien

Theses and Dissertations

The purpose of this study was to assess adult English Learners’ perceptions of using Microsoft Teams in classes. Specifically, the study aims to explore the strength and direction of the correlation between the elements of the technology acceptance model (TAM) and using Microsoft Teams in English language courses. This study addressed the following research question: What are the strengths and directions of the correlations between the elements of the technology acceptance model and the use of Microsoft Teams among adult ELs?

The researcher utilized a quantitative methods approach to investigate the relationship between TAM variables and the use of Microsoft …

The Connection Between Mental Illness And Prisoner Recidivism: A Study Of The Self-Perceptions And Perspectives Of Mentally Impaired Low-Level Non-Violent Male Exoffenders, Sammie L. Stinson

Theses and Dissertations

This dissertation investigates the connection between mental illness and prisoner recidivism in California and Los Angeles County. As the literature review discloses, there are various theories that claim to explain why mentally impaired offenders are reincarcerated for breaking the law after they are released. This dissertation presents five research questions based on the literature review and theoretical framework and collected survey and interview data from a sample of 30, self-reported, mentally impaired ex-offenders. The research questions and theoretical framework is intended to provide the reader with an assessment of the viewpoints of the mentally impaired survey participants regarding the connection …

A Systematic Review Of Risk And Protective Factors For Mental Health Among Latinx College Students, Melissa Gavilanes

Theses and Dissertations

A quantitative studies systematic review with narrative synthesis was conducted to explore the risk and protective factors among Latinx college students’ mental health. This systematic review also aimed to identify the relevant demographic variability to the mental health of Latinx college students, and the relationship between mental health and academic performance within this population. Data was collected from four electronic databases and included peer-reviewed articles published between 2000 and 2022, conducted within the United States, participants over the age of 17, and samples comprised of or including Latinx college students. Studies utilizing quantitative designs, and quantitative portions of mixed method …

A Systematic Review Of The Benefits Of Integrating Therapeutic Animals Into Trauma-Focused Treatments For Child And Adolescent Survivors Of Sexual Abuse, Zoe Thorne

Theses and Dissertations

An integrative systematic review with a narrative synthesis was conducted to explore and identify the benefits of integrating a therapy animal into trauma-informed treatment for children and adolescent survivors of sexual abuse. This review detailed various ways therapy animals were incorporated into treatment and when the integration of therapy animals is most and least beneficial. Methods. Eight electronic databases were searched for relevant articles. The search was limited to peer-reviewed articles published in the English-language. Articles published in and out of the United States were included, without a limit on date published, in order to capture any cultural differences and …

From Command Posts To Corporations: Applying United States Marine Corps Leadership Development To Corporate Organization Development, Paul D. Gowin

Theses and Dissertations

This research investigates the applicability of the United States Marine Corps (USMC) leadership development (LD) to corporate organizational development (OD). Despite significant investment in LD, many corporate programs do not meet expectations, highlighting the need for effective models. The USMC LD approach, emphasizing personal and subordinate leadership skills development, mission accomplishment, and team welfare, presents a unique model for exploration. This study examines the integration of USMC leadership components-traits, principles, and core values-into corporate leadership roles and evaluates the perception of USMC veterans on their applicability in corporate settings. The research employs a mixed-methods approach, combining quantitative surveys of 125 …

Exploring The Perceived Effects Of Online And Hybrid Learning On The Experiences Of Students In Nigerian Universities, Amaechi Ugwu

Theses and Dissertations

Recent years have seen an apparent increase in the popularity and acceptance of online and hybrid learning as alternative models of learning at universities and other institutions of higher education in Nigeria. However, there is doubt whether the increase in popularity and acceptance of online and hybrid learning has translated to better learning conditions or satisfaction for students and graduates of higher education. These issues among others have made online and hybrid learning models to represent an area of growing academic interest by scholars. The main purpose of this study was to explore the perceived effects of online and hybrid …

A Systematic Review Of The Effectiveness Of Family-Based Treatment With And Without Adjunctive Treatment For Children And Adolescents With Eating Disorders, Carly Poynter

Theses and Dissertations

Family-based treatment (FBT) has been widely accepted as the first-line treatment for children and adolescents with restrictive eating disorders. While this treatment has been widely studied and accepted as best practice, most studies confirming its effectiveness focus on the treatment of anorexia nervosa (AN) and bulimia nervosa (BN). There have been many studies aimed at providing adjunctive treatment to enhance the effectiveness of this treatment, but these benefits have yet to be cumulatively studied. The primary objectives of this study were to 1) summarize the effectiveness of FBT for the wide range of eating disorders, 2) summarize the effectiveness of …

Psychological Safety During The Covid-19 Pandemic Restrictions-A U.S. Healthcare Context, Mary Jean Brown

Theses and Dissertations

The pandemic forced many employees to transition to remote work, leading to concerns about the economic impact and inequities between remote and on-site workers. The shift to remote work has raised psychological safety issues, work-life balance, and employee engagement. The virtual workspace created during the pandemic has highlighted communication challenges, interpersonal dynamics, and maintaining boundaries between work and personal life. Through a quantitative approach, this study explored changes in perceived psychological safety, its relation to the psychosocial impact of COVID-19, and demographic factors, offering the opportunity to gain insights into this unprecedented experience during a global pandemic. Findings showed that …

Mandated Sexual Violence Prevention In Higher Education: A Quantitative Analysis Of Student Response To Sexual Harassment And Violence Through A Framework Of Organizational Culture, Andrew L. Jones

Theses and Dissertations

Sexual violence (SV) is a global public health crisis of pandemic proportions. Sexual harassment (SH) and violence are pervasive on college campuses, negatively impacting students, faculty, and staff. To address this, U.S. universities are required by federal law to implement EBP programs to foster awareness, knowledge, attitudes, and skills/behaviors (competencies) to prevent or mitigate sexual misconduct. Improving these competencies can increase students’ capacity to respond to SH and SV they experience or witness positively impacting retention, health, wellness, and graduation outcomes. Additionally, recent empirical evidence has linked organizational culture (i.e., values, shared beliefs, and artifacts) and competencies to effectively responding …

Not At The Expense Of Me: Best Practices For Black Women Diversity, Equity, Inclusion, And Social Justice Practitioners In Higher Education, Brittney Michelle Elese Fink

Theses and Dissertations

This qualitative research paper investigated the intersection of the COVID-19 pandemic and the year 2020 in sparking a phenomenon of hiring chief diversity officers (CDOs) in higher education. By exploring the interplay between the pandemic, racial justice movements, evolving higher education landscape, and institutional accountability, this study aimed to understand the motivations behind the increased hiring of CDOs during this transformative period. Additionally, this research examined the specific effects of this phenomenon on Black women diversity, equity, inclusion and social justice (DEI&J) professionals in higher education. The findings contribute to a deeper understanding of the opportunities and challenges faced by …

Examining The Role Of Cultural Capital In Access And Equity For Female C-Stem Learners Of Color, Tiffany L. Wright

Theses and Dissertations

This study aimed to examine the impact of cultural capital (Bourdieu, 1973; Bourdieu & Passeron, 1977) on the access and equity of C-STEM learners of color under the following four tenets of Yosso’s (2005) Community Cultural Wealth model: aspirational, familial, social, and navigational capital. A theoretical framework of Critical Race Theory (CRT; Crenshaw, 1988) was utilized to frame the study. Research questions explore the impacts of cultural capital upon the perceived access and equity of female C-STEM learners. Qualitative methodology guided the study under the integrated approach of Quantitative Ethnography (QE) which examines qualitative data with the support of statistical …