Digital Commons Network^™

The Other Side Of The Story: An Exploratory Case Study Of Barriers Experienced By Tennessee Transfer Pathways Students, Alexis Hartley

Doctoral Dissertations

The vital topic of improving the experiences of transfer students is investigated comprehensively in this research. A qualitative method was used in the design of the case study to explore the experiences that transfer students had while participating in a state transfer pathway program. In particular, this approach focused on the barriers that transfer students faced and the knowledge and actions that were required to overcome these barriers. After completion of an accredited associate's degree, students who have participated in the Tennessee Transfer Pathway (TTP) are eligible to transfer into a four-year program at one of the state's participating four-year …

Experiences With Student Loan Debt: A Phenomenological Study Of First-Generation, Low-Income College Graduates, Sarah Leigh Gardner Thomas

Doctoral Dissertations

First-generation and low-income (FGLI) individuals currently represent a large percentage of the total undergraduate student enrollment in U.S. colleges and universities. Student loan debt in the United States is also at an all-time high with approximately 43 million Americans sharing the $1.75 trillion total. Because FGLI individuals, like many other college students, often take on large amounts of student loan debt to successfully graduate college, it is worth learning more about the long-term effects that student loan debt has on the experiences of FGLI college graduates within the first ten years of graduating with a baccalaureate degree. The purpose of …

Counselor Influences On College Decision Making, Jordan Mccarter

Doctoral Dissertations

Although numerous studies have been devoted to understanding the role of the counselor in schools, few studies have been conducted to understand the specific influence that counselors have on girls throughout their college admissions process (Bryan, Farmer-Hinton, Rawls, & Woods, 2017; Bryan, Holcomb-McCoy, Moore-Thomas, & Day-Vines, 2009; Bryan, Moore‐Thomas, Day‐Vines, & Holcomb‐McCoy, 2011). The purpose of this study was to examine the interactions between girls and their high school college admissions counselors and the resources and programmatic offerings of the college counseling office that girls experience. Perna’s (2006) proposed conceptual model of college student choice served …

Social Wellness Of Counselor Education And Supervision Doctoral Students Before, During And After Covid-19, Alexandria Barnette

Doctoral Dissertations

Counselor education and supervision doctoral students (CESDS) comprise a unique population with oftentimes strenuous and competing roles that may impact their social wellness and feelings of connection and support. The arrival and continued presence of the coronavirus (COVID-19) pandemic also heightened isolation and increased impediments to connection and support for many. Given some of the benefits of social wellness, research on recent CESDS experiences is timely. This two-manuscript dissertation begins with a literature review on the topic and ends with an empirical study to further knowledge on the experience of social wellness that CESDS had during their doctoral programs taking …

Integration Of Raman Spectroscopy And Python-Based Data Analysis For Advancing Neurobiological Research, Natalie E. Dunn

Doctoral Dissertations

The field of Raman spectroscopy continues to expand into biological applications due to its usefulness as a non-invasive technique that can be utilized qualitatively and quantitatively. However, the inherent weakness of Raman scattering leads to the need for each collected spectra to undergo a preprocessing step to remove noise, background drift, and cosmic rays. Biological research in particular needs large datasets due to the increased variability in samples. As datasets grow, the need to perform preprocessing on each individual spectra becomes daunting. Often, these steps are done by hand with the help of specialized software programs. Preprocessing can be accelerated …

Characterization Of Lignin Structural Variability And The Associated Application In Genome Wide Association Studies, Nathan D. Bryant

Doctoral Dissertations

Poplar (Populus sp.) is a promising biofuel feedstock due to advantageous features such as fast growth, the ability to grow on marginal land, and relatively low lignin content. However, there is tremendous variability associated with the composition of biomass. Understanding this variability, especially in lignin, is crucial to developing and implementing financially viable, integrated biorefineries. Although lignin is typically described as being comprised of three primary monolignols (syringyl, guaiacyl, p-hydroxyphenyl), it is a highly irregular biopolymer that can incorporate non-canonical monolignols. It is also connected by a variety of interunit linkages, adding to its complexity. Secondary cell wall …

Regulation Of Protein Synthesis In Arabidopsis Thaliana Through A Bioinformatic And Mathematical Lens, Ricardo Andres Urquidi Camacho

Doctoral Dissertations

Organisms exist under constantly varying environmental and internal conditions, which necessitate the differential regulation of gene expression. To synthesize proteins, the ribosome translates the information encoded in the nucleotide sequence of an mRNA into the final, functional amino acid sequence. Knockouts of ribosomal proteins lead to lethality. One such protein is the ribosomal protein 6 of the small subunit (eS6/RPS6). We confirmed that the knockout of either one of two eS6 paralogs in Arabidopsis leads to stunted growth and chlorosis. Here, these phenotypes have been further characterized in seedlings by precisely quantifying the ribosome loading of mRNAs as well as …

Towards Expressive And Versatile Visualization-As-A-Service (Vaas), Tanner C. Hobson

Doctoral Dissertations

The rapid growth of data in scientific visualization has posed significant challenges to the scalability and availability of interactive visualization tools. These challenges can be largely attributed to the limitations of traditional monolithic applications in handling large datasets and accommodating multiple users or devices. To address these issues, the Visualization-as-a-Service (VaaS) architecture has emerged as a promising solution. VaaS leverages cloud-based visualization capabilities to provide on-demand and cost-effective interactive visualization. Existing VaaS has been simplistic by design with focuses on task-parallelism with single-user-per-device tasks for predetermined visualizations. This dissertation aims to extend the capabilities of VaaS by exploring data-parallel visualization …

Functional Cementitious Composites With Micro-Sized Particulate Fillers For Additive Construction And Energy-Efficient Buildings, Adam Brooks

Doctoral Dissertations

With a growing energy demand, the development of sustainable and energy efficient building materials is growing rapidly. Numerous researches have focused on low carbon footprint construction materials, high-performance thermal insulations, high-performance façade, and thermal energy storage. Among these, the development of functional cementitious composites has attracted significant attention due to its potential utilities in building energy reduction and decarbonatization efforts. For example, fly ash cenospheres have been used as micro-size lightweight fillers to achieve low density and thermal conductivity. The use of phase change materials (PCM) in concrete has been studied to answer energy demands. While their inclusion into concrete …

Utilization Of Integer Programming For Scheduling Maintenance At Nuclear Power Plants, Timothy Gallacher

Doctoral Dissertations

This thesis develops a thought that naturally explores three specific motifs for solving the complexities of scheduling maintenance at Nuclear Power Plants (NPP). The first chapter of this paper will develop the initial thought around creating a schedule for a given work week, including all the various constraints inherent to this problem. Such constraints include but are not limited to personnel availability, allowable component out-of-service time, and the Plant Risk Assessment. The objective function being to minimize the total cost of worker’s compensation for that given week.

The second chapter addresses the question of whether this simple schedule can be …

Development And Biomechanical Analysis Toward A Mechanically Passive Wearable Shoulder Exoskeleton, Seyyed Morteza Asgari

Doctoral Dissertations

Shoulder disability is a prevalent health issue associated with various orthopedic and neurological conditions, like rotator cuff tear and peripheral nerve injury. Many individuals with shoulder disability experience mild to moderate impairment and struggle with elevating the shoulder or holding the arm against gravity. To address this clinical need, I have focused my research on developing wearable passive exoskeletons that provide continuous at-home movement assistance. Through a combination of experiments and computational tools, I aim to optimize the design of these exoskeletons.

In pursuit of this goal, I have designed, fabricated, and preliminarily evaluated a wearable, passive, cam-driven shoulder exoskeleton …

Additive Manufacturing Of Magnetic Materials For Electric Motor And Generator Applications, Haobo Wang

Doctoral Dissertations

This work details the research into the 3D Printing, also known as Additive Manufacturing (AM), of both impermanent and permanent magnets. This work also details the research in enabling such AM magnets in electrical machine applications, primarily motors and generators. The AM processes of many types of magnets are described in detail. The material properties of such AM magnets are also described. The two main types of AM magnets that are discussed in detail are AM NdFeB, and AM Silicon Steel. The implementation of AM NdFeB as rotor magnets, and the implementation of AM Silicon Steel as rotor and stator …

Short Range Correlation Measurements In The Quasielastic Region With An 11 Gev Beam, Casey Morean

Doctoral Dissertations

Electron scattering is a significant means of studying internal high momentum
nucleon and quark distributions in nuclei. Thomas Jefferson National Accelerator
Facility (JLab) with its 11GeV beam is capable of studying high momentum nucleons
with unmatched precision. The role of short range nucleon configurations and
quark distributions is significant for understanding the dynamics of nuclei and their
underlying components. Scattering cross section measurements in the kinematic
regime x > 1, where the free nucleon is forbidden, are sensitive to high momentum
nucleons, which are believed to come from short range correlations (SRCs). SRCs are
strongly interacting, high momentum nucleons with a …

Exploring The Regulation Of A Bacillus Pumilus Bioplastic Degrading Protein, Elise Keara Phillips

Doctoral Dissertations

Biodegradable plastics are being adopted to reduce the environmental impacts associated with petroleum-based plastics, including long residence times, and reliance on fossil fuels as a feedstock. Microbial degradation of bioplastics is still poorly understood, which leads to inconsistent degradation outcomes and challenges for implementation. Bacillus pumilus B12 degrades the biodegradable bioplastic polylactic acid (PLA) via the protease AprE, but the regulatory mechanisms controlling aprE expression in B. pumilus B12 are largely unknown. To explore this question, we established developed a conjugation- based method to introduce DNA into B. pumilus B12 and diverse Bacillus species that is applicable to environmental and …

Mentor Teacher Positioning During Pedagogical Documentation With Early Childhood Preservice Teachers, Melissa Renee Westfall

Doctoral Dissertations

Teacher education research shows that partnerships among mentor teachers and preservice teachers facilitate meaningful professional development when both are afforded the opportunity to assume dynamic positions of teacher and learner. The purpose of this qualitative, descriptive case study was to explore mentor positioning and pedagogical documentation at a university-based early childhood center with five mentor teachers (MTs) and five undergraduate preservice teachers (PTs). It explored the efficacy of pedagogical documentation review as a tool to facilitate moments of reciprocal mentoring. Through the framework of cultural-historical activity theory and subject positioning theory, I investigated how mentors positioned themselves during pedagogical documentation …

Characterizing The Structure And Radiation Resistance Of Weberite-Type Complex Oxides, Igor M. Gussev

Doctoral Dissertations

Weberite-type A₃BO₇ oxides, where A is a trivalent rare earth and B is a pentavalent element like Ta, have been a focus of research due to the discovery of the weberite-type local atomic arrangement in ceramics with a defect-fluorite structure. Earlier studies primarily examined their long-range structures, leaving gaps in understanding their short-range atomic behavior. This thesis investigates various weberite-type tantalates across all structural scales. There has been debate over the long-range structure of Y₃TaO₇, a medium-sized rare earth tantalate oxide, particularly regarding its spacegroup symmetry. This work identifies Y₃TaO_{7 …}

Exact Models, Heuristics, And Supervised Learning Approaches For Vehicle Routing Problems, Zefeng Lyu

Doctoral Dissertations

This dissertation presents contributions to the field of vehicle routing problems by utilizing exact methods, heuristic approaches, and the integration of machine learning with traditional algorithms. The research is organized into three main chapters, each dedicated to a specific routing problem and a unique methodology. The first chapter addresses the Pickup and Delivery Problem with Transshipments and Time Windows, a variant that permits product transfers between vehicles to enhance logistics flexibility and reduce costs. To solve this problem, we propose an efficient mixed-integer linear programming model that has been shown to outperform existing ones. The second chapter discusses a practical …

Understanding The Impact Of Instagram Sponsored Ads: Message Explicitness And Moderating Factors On Consumer Perception And Behavior, Bomi Lee

Doctoral Dissertations

This experimental study aims to explore how Instagram sponsored advertisements impact consumer perception and behaviors, focusing on the overarching Persuasion Knowledge Model (PKM) theory. The study consists of two distinct experiments, each examining different moderators while maintaining a central emphasis on message explicitness and its interaction with other variables.

In Study 1, participants were exposed to Instagram sponsored ads featuring different levels of message explicitness (explicit vs. implicit) and varying product types (utilitarian vs. hedonic). The main outcome variable assessed was immediate purchase intent. The mediators, persuasion knowledge, and perceived deceptiveness, were also analyzed to understand their impact on the …

Generative Adversarial Game With Tailored Quantum Feature Maps For Enhanced Classification, Anais Sandra Nguemto Guiawa

Doctoral Dissertations

In the burgeoning field of quantum machine learning, the fusion of quantum computing and machine learning methodologies has sparked immense interest, particularly with the emergence of noisy intermediate-scale quantum (NISQ) devices. These devices hold the promise of achieving quantum advantage, but they grapple with limitations like constrained qubit counts, limited connectivity, operational noise, and a restricted set of operations. These challenges necessitate a strategic and deliberate approach to crafting effective quantum machine learning algorithms.

This dissertation revolves around an exploration of these challenges, presenting innovative strategies that tailor quantum algorithms and processes to seamlessly integrate with commercial quantum platforms. A …

Novel Microbial Guilds Implicated In N2o Reduction, Guang He

Doctoral Dissertations

N₂O is a long-recognized greenhouse gas (GHG) with potential in global warming and ozone depletion. Terrestrial ecosystems are a major source of N₂O due to imbalanced N₂O production and consumption. Soil pH is a chief modulating factor controlling net N₂O emissions, and N₂O consumption has been considered negligible under acidic conditions (pH <6). In this dissertation, we obtained solids-free cultures reducing N₂O at pH 4.5. Furthermore, a co-culture (designated culture EV) comprising two interacting bacterial population was acquired via consecutive transfer in mineral salt medium. Integrated phenotypic, metagenomic and metabolomic analysis dictated that the Serratia population excreted certain …

Characterizing Silicate Materials Via Raman Spectroscopy And Machine Learning: Implications For Novel Approaches To Studying Melt Dynamics, Blake O. Ladouceur

Doctoral Dissertations

Silicate melt characteristics impose dramatic influence over igneous processes that operate, or have operated on, differentiated bodies: such as the Earth and Mars. Current understanding of these melt properties, such as composition, primarily comes from investigations on their volcanic byproducts. Therefore, it is imperative to innovate on modalities capable of constraining melt information in environments where a reliance on laboratory methods is severed. Recent investigations have turned to Raman Spectroscopy and amorphous volcanics as a suitable pairing for exploring these ideas. Silicate glasses are a proxy for igneous melts; and Raman spectroscopy is a robust analytical technique capable of operating …

The Nuclear System-Of-Systems Capabilities Analytic Process, Robert Boone Gilbreath

Doctoral Dissertations

This work includes the first known capabilities-based vulnerability analysis process able to evaluate a system of systems exposed to nuclear weapon environments: the Nuclear System-of-Systems Capabilities Analytic Process (NuSCAPTM). This approach, executed by an automated Python® application, calculates the magnitudes of eight nuclear weapon environment quantities by calling on the US Strategic Command Probability of Damage Calculator (PDCALC) code, the Los Alamos National Laboratory Simple Nuclear Effects Calculator (SNEC) program, and the Monte Carlo N-Particle® (MCNP®) code. Calculated nuclear weapon environment values are compared with user-provided dysfunction thresholds for all components, subsystems, and systems in the model to determine the …

Integrated Modeling And Monitoring For A Healthy And Sustainable Building Environment, Yifang Xu

Doctoral Dissertations

The transmission of airborne diseases indoors is a significant challenge to public health. Buildings are hotspots for viral transmission, which can result in adverse effects on human health and quality of life, especially considering that individuals spend approximately 87% of their time indoors. The emergence of the COVID-19 pandemic has highlighted the importance of considering health aspects during the development of sustainable built environments. Consequently, maintaining a healthy, sustainable, and comfortable built environment represents a major challenge for facilities management teams. However, research on the infection risks associated with emerging pandemics is still in its infancy, and the effectiveness of …

Tiktok Use And Body Dissatisfaction: Examining Direct, Indirect, And Moderated Relations, Danielle Leigh Mink

Doctoral Dissertations

In this study, we examined potential indirect and moderated effects in the relations between the use of TikTok, a video-based appearance-related social networking site, and body dissatisfaction among a sample of approximately 475 United States’ young adult college women residing in the Southeast. We hypothesized that TikTok use would be directly and indirectly related to body dissatisfaction through more upward appearance comparison and more body surveillance in serial. We also hypothesized that exposure to body positive media and social media literacy (both commercial and peer) would moderate or buffer both the direct and indirect links between TikTok use and body …

Responsive Building Envelope For Grid-Interactive Efficient Buildings – Thermal Performance And Control, Yawen He

Doctoral Dissertations

The building sector accounts for 30% of total energy consumption worldwide. Responsive building envelopes (or RBEs) are one of the approaches to achieving net-zero energy and grid-interactive efficient buildings. However, research and development of RBEs are still in the early stages of technologies, simulation, control, and design. The control strategies in prior studies did not fully explore the potential of RBEs or they obtained good performance with high design and deployment costs. A low-cost strategy that does not require knowledge of complex systems is needed, while no studies have investigated online implementations of model-free control approaches for RBEs. To address …

The Role Of Trait Mindfulness, Perceived Stress, And Impulsivity In Understanding The Relationship Between Stress Mindset And Psychological Intimate Partner Aggression, Sarah Joyanna Johnson

Doctoral Dissertations

Perpetration of psychological intimate partner aggression is a pervasive health issue and has been estimated to occur in 60 to 90 percent of relationships. Effects of intimate partner violence on its victims has been demonstrated to have lasting physical and mental health issues. Psychological intimate partner aggression has been demonstrated to have particularly harmful effects, above and beyond those identified in physical intimate partner aggression. Psychological intimate partner aggression has been demonstrated to be impacted by impulsivity, stress-mindset, perceived stress, and mindfulness. The present study proposed to examine a path analysis model of the relation between stress-mindset and psychological intimate …

Sexual Violence And Psychological Distress: The Roles Of Coping Self-Efficacy, Self-Blame, Shame, Activism, And Feminism, Charlotte Strauss Swanson

Doctoral Dissertations

In the current study, we investigated potential direct, indirect, and moderated relations in the links between exposure to sexual violence and PTSD symptom severity and depression among a sample of 440 United States women who had experienced sexual assault in adulthood. We found that sexual violence exposure was both directly and indirectly related to PTSD symptom severity via less trauma coping self-efficacy, greater behavioral and characterological self-blame, and more shame. Sexual violence exposure was also indirectly related to depression via the same explanatory variables, except for behavioral self-blame. Contrary to our hypotheses, results indicated that involvement in anti-sexual activism and …

Altering Activities To Enhance The Effects Of Social Skills Training And Tootling On Elementary Students Performance Of Recently-Trained Social Skills, Kristen Fowler

Doctoral Dissertations

Researchers have found that Social Skills Training (SST) does not consistently enhance students’ performance of trained skills in authentic social contexts. Recently, researchers have demonstrated that supplementing SST with positive peer reporting (PPR), specifically Tootling, can enhance students’ performance of recently trained skills as they engage in various small group activities. During these studies, the activity that students engaged in while Tootling may have influenced performance of recently trained social skills.

In the current study, SST training was provided and Tootling was applied as elementary students completed math assignments in small-groups. As students worked in these groups, researchers collected data …

The Impact Of Guaranteed Income On Political Participation, Daniel Horn

Doctoral Dissertations

This three-paper dissertation examines the impact of guaranteed income (GI) and cash transfer (CT) programs on political participation, aiming to contribute to understanding how social policies can shape civic engagement. The first paper provides a comprehensive literature review on GI and CT programs, focusing on their potential effects on political participation. By analyzing existing studies, this paper identifies key findings and gaps in the literature, setting the stage for further empirical investigation. The second paper develops and tests a new instrument called the Brief Political Participation Scale (BPPS), designed to measure political participation concisely and reliably. The third paper presents …

A Path Model Of Scct Applied To The Rural Appalachian Community, Sean M. Murphy

Doctoral Dissertations

The current study investigates the relationship between variables in the Social Cognitive Career Theory model as applies to rural Appalachia. A path model was conducted in order to see which variables are significantly related, as well as which paths differ from the hypothesized model, in this population. Results suggest that there is a direct effect of college going self-efficacy (CGSES) on college planning behaviors (CPB), as well as direct paths from barriers and postsecondary supports (PSS) to pursuing a education after high school. Indirect effects were also found from PSS and Barriers to CPB through CGSES. Surprisingly, no direct path …