Digital Commons Network^™

Ensuring Successful Bond Referendums In Rural South Carolina School Districts: Key Strategies Employed By Superintendents, David Fallaw

All Dissertations

The purpose of this study was to develop a better understanding of the strategies of superintendents that lead to the successful passage of referendums within small, rural districts in South Carolina. Federal, state and local revenue streams make up the majority of funding for operating expenses for districts in South Carolina. For capital projects, however, the majority of districts must rely on local funding. The primary method to acquire the needed revenue is through a referendum which can be a costly and time-consuming process that moves the focus of school and district leadership from teaching and learning to pursuing funding …

The Diverse Effects Of Continual Organic Inputs On Soil Biogeochemical Properties And Microbial Communities In Sandy Ultisols Under Organic Production, Zhine Wang

All Dissertations

The objectives of this study were to understand how continual organic amendment inputs improve Nitrogen (N) cycling, microbial diversity and functional traits. Fully crossed factorial experiments were designed to test four cover crop treatments (cereal rye, hairy vetch, mixture of the rye and vetch, and no cover crop fallow) and two levels of manure compost application (with manure application and blank control) in organic vegetable production from 2020 to 2023. Cover crop biomass, soil chemical and biological properties were analyzed for the distribution and availability of soil labile N (Chapter 2), the abundance of N-cycling genes (Chapter 3), the structure …

Exploring Mechanisms Of Chemical Resistance In Xanthomonas Arboricola Pv. Pruni And Strategies To Mitigate Resistance And Improve Disease Control, Milan Panth

All Dissertations

Xanthomonas arboricola pv. pruni (XAP) is a phytopathogenic bacterium that causes bacterial spot of peach. It causes spotted lesions on leaves and fruit, leading to early defoliation and unmarketable fruit, respectively. The pathogen can overwinter in twig cankers, which serve as the primary initial inoculum source for the next season’s leaf and fruitlet infection. The current disease management practice mainly relies on routine application of chemical bactericides containing copper or oxytetracycline (OTC) in the growing season. However, disease incidence can still be high despite chemical control measures in warm, rainy seasons.

Frequent applications of copper and OTC in United …

Computational Representation, Analysis And Verification Of Requirements In Engineering Design And Systems Engineering, Chandan Kumar Sahu

All Dissertations

Systems are developed to satisfy a set of requirements derived from stakeholders’ needs, defining the problem space for which the system is created as a feasible solution. The system design process begins with eliciting these requirements and concludes with validating whether the created system meets them. Requirements engineering (RE) encompasses elicitation, representation, analysis, documentation, verification, and validation. However, challenges in RE, such as imprecision in natural language (NL), proprietary restrictions, and a lack of standardized quality metrics, hinder the creation of well-formed and comprehensive requirements. These challenges complicate formalization and analysis of requirements.

This dissertation addresses these challenges by proposing …

Bap1: Genotype-Phenotype Correlation, Variant Classification, And Treatment Efficacy, Elizabeth Hobbs

All Dissertations

BRCA1-associated protein 1 (BAP1) is a tumor suppressor gene located on chromosome 3p21.3 and encodes a deubiquitinase enzyme (DUB) involved in DNA repair, cell cycle and metabolism, and apoptosis. BAP1 pathogenic germline variants are primarily associated with a familial cancer syndrome, Tumor Predisposition Syndrome 1 (TPDS1), but new missense variants have been linked to a neurodevelopmental disorder known as Kury-Isidor Syndrome (KURIS). Patients with TPDS1 variants have an increased risk for developing cancers, such as uveal and cutaneous melanomas, mesothelioma, and renal cell carcinoma, at an earlier age with lower thresholds for environmental exposures, mainly UV rays and asbestos, compared …

Nanostructured Silicon Meta-Waveguides And Surfaces For Enhanced Light-Matter Interaction, Saddam Gafsi

All Dissertations

In this study, we tackle the challenge of light-matter interaction engineering and local field enhancement using various silicon photonic platforms based on three different approaches. (i) The first approach is based on boundary condition engineering where we present and show through simulation and experimental results, a silicon nanodisk “diabolo” configuration able to support significant local field enhancement levels in the range ~102 to 104 in the high index medium through proper structural modifications at the nanoscale. We show that the presented optical behavior is consistent with the anapole modes characterized by the observed near-field enhancement and coinciding with far-field suppression. …

Characterizing Treatment Patterns And Associated Outcomes For Medicare Beneficiaries With Proximal Humerus Fractures, Sydney Lindros

All Dissertations

Proximal humerus fractures (PHF) are a common injury affecting older adults, though clinical decision making for these fractures remains challenging for physicians. Over the past two decades, clinical decision making has evolved with the emergence of new evidence like the ProFHER trial and the dissemination of reverse total shoulder arthroplasty (RTSA). There is a need to characterize the effects of these changes across geographic areas and evaluate the impact of differences in surgical procedure utilization rates on patient outcomes. Therefore, the goal of this dissertation was to gain a better understanding of the utilization patterns and outcomes associated with different …

Selective Hydroxyl Functionalization Using Novel Bifunctional Macrocyclic Catalysts And Sufex-Based Methodologies, Austin Seilkop

All Dissertations

The research behind this dissertation explores innovative strategies for the functionalization of alcohols. Alcohols are abundant in biologically relevant molecules and pharmaceutical drugs, so designing new methods for modifying them has gained significant interest over the years. The first and second chapters of this dissertation focus on the selective functionalization of a particular class of alcohols, amino alcohols, a well-represented functional handle in biomolecules. The hydroxyl functionalization of amino alcohols often demands multiple synthetic steps. We developed a new class of macrocyclic catalysts to enable precise and efficient transformations of amino alcohols, advancing the scope and efficiency of amino alcohol …

Foster Care, Substance Use, And Social Determinants Of Health In South Carolina: A Geographic Approach, Patricia Carbajales-Dale

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Foster care is a critical intervention for vulnerable children, with approximately 400,000 children entering the system annually in the United States. Parental substance use, second only to neglect, is now a leading cause of foster care entry. While previous research has explored the relationship between socioeconomic factors and foster care, few studies have incorporated spatial approaches at the neighborhood level to understand how factors such as economic inequality, healthcare disparities, and substance use influence foster care entries. This study addresses that gap by integrating spatial analysis and machine learning techniques to examine the geographic and social dynamics underlying foster care …

Protocol Transformations Across Osi Network Stack Layers For Attack, Evasion, And Defense, Nathan Tusing

All Dissertations

Network endpoints frequently contend with errors and deviations within protocols. Many factors account for these deviations including noise, tampering, and algorithm implementations. Intermediate nodes are expected to modify instantiated protocols and not guarantee correctness. This ability to modify traffic enables all sides of network security to alter security and performance properties of protocols, and we define this intermediary modification of an instantiated protocol as a transformation. Protocol transformations traverse layers of the OSI reference model and changes a protocol's time series byte sequence. Within this thesis, we show that this framework applies to multiple domains and protocols. Common examples of …

Characterizing Mechanisms Of Dna Repair And Genome Stability, Joshua Turner

All Dissertations

Every day our cells are bombarded with DNA lesions that threaten the stability of our genome. To help maintain genomic integrity our cells evolved to have a network of enzymes dedicated to repairing DNA lesions. Upon encountering a site of DNA damage, a cell recruits enzymes that remodel the stalled replication fork by reannealing the newly synthesized DNA together known as fork regression. Loss of fork regression activity has been shown to promote replication stress resistance after induced DNA damage. In this thesis, I discuss the role F-Box Helicase 1 (FBH1) plays in fork regression and how FBH1 promotes the …

Emerging Agency In Border Communities During Pandemics, William Ordeman

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“Emerging Agency in Border Communities During Pandemics” uncovers the complex natural and social histories of two Texas border counties, El Paso and Hidalgo, to explain how these counties became highly susceptible to the COVID-19 outbreak in 2020. This work argues that humans engaging with natural resources throughout history created a rhetoric of exploitation and social hierarchy along the Texas/Mexico border. Rhetoric from Spanish and Anglo colonists coupled with environmental phenomena across time displaced Latinx/e bodies living in these counties into precarious communities called colonias, and the presence of these colonias made each county highly susceptible to disease outbreak. I …

Barriers To Postsecondary Education Of Latinx Students Using Future Time Perspective Theory, Clayton Porter

All Dissertations

The purpose of this qualitative study is to investigate how future time perspective influences high school Latinx’ seniors’ beliefs and access to postsecondary education through a case study approach. Future time perspective, the extent to which individuals anticipate and plan for the future, is examined in relation to the students’ educational aspirations and barriers. This study used a combination of surveys and semi-structured interviews to collect data from Latinx high school seniors. Interviews were conducted with eight high school seniors who identified as Latinx, and also were actively working towards graduation and application to a postsecondary institution. The data from …

Getting Out Of The Starting Blocks Well: Analyzing The Impact Of An At-Risk First-Year Mentoring Program At A Rural High School In The Southeastern United States Of America., Jeffrey Duncan

All Dissertations

As the US educational system recovers from the COVID-19 pandemic, school districts around the country search for ways to help students who have struggled to have academic success. Navigating the transition from middle to high school is critical for reaching on-time graduation for at-risk first-year high school students. A critical step in graduating is ensuring students feel that school is where they belong. Building relationships with a trusted adult on campus through weekly mentoring sessions is a strategy that can impact student academic outcomes. This dissertation uses the methodology of education improvement science through a Plan Do Study Act cycle …

Enhancing Protonic Ceramic Fuel Cells By Advanced Laser Processing For Superior Performance, Tianyi Zhou

All Dissertations

As global temperatures rise, the demand for clean energy solutions intensifies. Protonic ceramic fuel cells (PCFCs) offer advantages like higher conductivity at moderate temperatures (300–700 °C), fuel flexibility, stability, and lower costs. However, traditional PCFC manufacturing faces challenges with interface defects, structural imperfections, and scalability, especially in producing large-area cells and stacks.

This work addresses these issues using advanced laser processing techniques. Laser ablation and direct laser rapid additive manufacturing (DL-RAM) enable precise control of PCFC microstructures, removing surface defects and increasing bonding strength for higher efficiency. Digital layer deposition allows for large-area PCFC single cells and stack production with …

Leveraging High-Frequency Water Quality Data And Machine Learning For Monitoring Harmful Algal Blooms, Ibrahim Busari

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Freshwater management is one of the most critical resources on the earth due to the plethora of water use and its limited availability. Increased algae proliferation is one of the significant problems of freshwater bodies that is triggered by nutrient enrichment and enabling conditions such as light and warm temperatures. This algal proliferation is toxic to the ecosystem through their biomass and potential toxin production that can cause hypoxic conditions and is often referred to as Harmful Algal Blooms (HABs). Current monitoring approaches include laboratory analysis of water samples to observe algal cells, monitoring of water quality parameters using water …

Academic Vocabulary Acquisition In A 3rd Grade Science Classroom: A Mixed-Methods Embedded Study, Nicole Langenhuizen

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With the acceptance of the Next Generation Science Standards, elementary-aged students are encouraged to develop the skills needed to communicate their thinking in science efficiently and effectively (NGSS, 2013). Since implementing these new standards in 2013, South Carolina has seen a decline in science standardized testing scores for grades 3-5. These results show that science and engineering skills support 67% of U.S. jobs today (National Science Foundation, 2021), and the current trend is that science and engineering skills are essential to students today and provide a rationale for exploring how teachers can help students develop the vocabulary necessary to communicate …

Supporting Holistic, Informed, Decision-Making Through The Complementarity Of Life Cycle Assessment And Radiological Protection, Bryanna Wattier-Weisensee

All Dissertations

Decision making is challenging and it is necessary to consider all relevant data to make an informed decision. The work herein provides a pathway wherein the fields of radiological protection and life cycle assessment (LCA) can be utilized synergistically to benefit the decision-making using the other (and vice versa). Specifically, LCA parallels decision-aiding techniques used in the optimization of radiological protection and LCA includes an ionizing radiation potential (IRP) impact category wherein the impacts associated with an emission of radioactive material is quantified to determine the human health impact. Thus this body of work focuses on (1) expanding the platform …

Exploring The Compositional Limits Of Y2o3-Al2o3-Sio2 Optical Fibers, Miranda Stone

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Of the widely varying compositions fabricated into optical fibers using the molten core method (MCM), the most studied by far as been those in the Y₂O₃-Al₂O₃-SiO₂ (YAS) system. Such fibers have been shown to be of interest for fiber amplifiers and lasers since they exhibit a good balance between reasonable loss, intrinsically low optical nonlinearities, and efficient gain. The majority of the fibers studied globally to-date have primarily focused on YAG-derived fibers, i.e., YAG (Y₃Al₅O₁₂) single crystals drawn in a pure SiO₂ cladding glass) …

Short-Circuit Modeling And Instantaneous Overvoltage Protection Of Renewable Farms, Shah Mohazzem Hossain

All Dissertations

The existing utility grid is experiencing a paradigm shift in electricity generation due to a significant penetration of renewable energy sources. This shift is primarily driven by the large-scale integration of solar and wind energy farms, particularly in the transmission network, where these farms are typically accompanied by battery energy storage in a hybrid configuration to overcome source intermittency and improve reliability. Such renewable farms comprise numerous inverters, pad-mounted transformers, collector feeders, and dc-side components depending on the generation-source type. Additionally, inverters within these farms exhibit distinct operating modes, such as `grid-following'(GFL) and `grid-forming'(GFM), as well as fault control modes, …

Hydrothermal Synthesis, Characterisation, And Magnetic Study Of First-Row Transition Metal Molybdates And First-Row Transition Metal Vanadates, Mahsa Foroughian Foroughian

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Growing high-quality single crystals of transitional metal oxides have been of interest over the last two centuries because of the many applications of these transparent materials in various industries, such as optics, magnetism, semiconductors, and batteries. During this period, a variety of crystal growth techniques have been utilized, each offering unique advantages and disadvantages to the solid-state community.

Traditionally, metal oxides such as molybdates and vanadates are produced using high-temperature techniques (700 to 1200 °C). These methods can cause oxygen to be expelled, resulting in the creation of lattice defects and lower-valence metal ions and complicate precise measurements of physical …

Andre-Quillen Homology And Special Classes Of Ring Homomorphisms, Hossein Faridian

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This thesis is comprised of three chapters. The first chapter deals with a purely algebraic proof of a deep result of Quillen stating that the category of simplicial commutative algebras over a commutative ring is a model category. The central focus of our approach is on the study of shuffle product of connective chain complexes that provides a bridge to translate the constructions in the simplicial algebra world to the chain complex world.

The second chapter delves into Quillen's fundamental spectral sequences that relate Andre-Quillen homology and cohomology to Tor and Ext functors. Our comprehensive treatment develops and streamlines the …

Biogeochemical Controls Of Cesium-137 Migration In Surface Waters And Near Surface Sediments At The Usdoe Savannah River Site, Reid Williams

All Dissertations

Considerable concentrations of cesium-137 (¹³⁷Cs) and other anthropogenic radionuclides have been released into the environment at the Savannah River Site (SRS). Additionally, cesium-containing radioactive waste will be stored onsite for the foreseeable future. Therefore, the goal of this work was to identify mechanisms controlling cesium transport in surface waters and near surface sediments at SRS to further the understanding of ¹³⁷Cs migration in the vadose zone and reservoirs. It was hypothesized that a multitude of factors impact the mobility of ¹³⁷Cs at the SRS, but that the clay sediment fraction provides an important contribution in limiting …

Recyclable Composites Prepared From Animal Coproducts And Industrial Waste Sulfur, Perla Y. Sauceda-Oloño

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Pursuing sustainable and environmentally friendly materials has become a significant objective in materials science, particularly flame retardants and construction materials. This dissertation explores the development and evaluation of novel composites and high sulfur-content materials (HSMs) as potential alternatives to conventional, environmentally harmful materials.

Chapter one reviews recent advancements in environmentally benign flame-retardant additives, highlighting the potential of bio-derived phenols, polysaccharide derivatives, and greener phosphorus sources. The review discusses how green additives can enhance the flame retardancy, thermal stability, and smoke suppression properties of various polymers while addressing the challenges and future directions in the field.

Chapter two investigates the production …

Concert Tickets, Party Matching, Sleeping Barbers, And Single Lane Bridges: Characterizing Student Reasoning About Concurrency, Aubrey Lawson

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Programming with concurrency is challenging both to learn and to teach. A concurrent program has multiple computations happening “at the same time” either simultaneously or in an interleaved manner. It is non-deterministic, imposing only a partial ordering on its decomposed parts. Advantages of concurrency include the potential for increased program throughput, high responsiveness and reduced complexity of program structure. But a concurrent program can be more complex to reason about than a sequential program, in part because the conditions of correctness must hold for all possible execution sequences and also because programmers must implement and reason about synchronization constructs that …

Promoting Adolescent Mental And Physical Health: Initiatives Focused On Connecting Public Health And Social Services To The Health Sector In Nebraska, Theresa Nguyen

Capstone Experience: Master of Public Health

This capstone focuses on the second recommendation of improving access to comprehensive, coordinated health services from the National Academies of Sciences, Engineering, and Medicine report The Promise of Adolescence: Realizing Opportunity for All Youth (2019). This proposal uses secondary data from the research project, Moving Evidence-Based Recommendations to Practice to Strengthen the Health Care System in Nebraska. Key stakeholders (n=28) were interviewed from the health care, public health, social services, and policy sectors. Each subject was asked to participate in a semi-structured interview by a trained interviewer. The interview was 1 hour long and conducted via phone call or Zoom. …

The Association Between Systolic Blood Pressure And Coronary Heart Disease In The Framingham Heart Study: A Long-Term Prospective Cohort Study, Alexandrea M. Welch

Capstone Experience: Master of Public Health

Coronary heart disease (CHD) is a leading cause of morbidity and mortality worldwide, with systolic blood pressure (SBP) as a critical risk factor. This study utilized data from the Framingham Heart Study to assess the association between SBP and CHD among participants. Univariate, bivariate, and multivariable logistic regression was used to explore this association as well as the association with other key covariates. We found a significant positive association between elevated SBP and the risk of CHD (adjusted OR: 1.69, 95% CI: 1.41-2.01, p < 0.0001). Age, sex, current blood pressure medication use, and body mass index (BMI) were significantly associated with CHD. Our findings support the need for blood pressure management to prevent cardiac events and reduce CHD burden.

Dietary And Physical Activity Behaviors In 2021 And Changes From 2019 To 2021 Among High School Students: A Replication Study, Jamila Nasir

Capstone Experience: Master of Public Health

Shannon L. Michael et al. conducted the study “Dietary and Physical Activity Behaviors in 2021 and Changes from 2019 to 2021 Among High School Students” to compare the prevalences of specific dietary and exercise behaviors among high-school students between 2019 and 2021, in order to examine how the COVID-19 pandemic affected these behaviors and to identify disparities in these effects.

This replication of the study focuses on exercise behaviors. The study data, drawn from the CDC’s YRBS in 2019 and 2021, had been selected using a three-stage cluster sampling method in which the clusters in the third stage were selected …

Association Between Cigarette Smoking And Angina Pectoris Among Middle-Aged Adults: Findings From The Framingham Cohort Study, Lauren M. Hron

Capstone Experience: Master of Public Health

Objectives: This study investigates the relationship between current cigarette smoking at baseline and the occurrence of angina pectoris during follow-up among middle-aged adults (30-70 years), adjusting for age, sex, BMI, diabetes status, education, and number of cigarettes smoked per day.

Methods: Using the Framingham Heart Study cohort (N=4,434), logistic regression analyses were performed. A backward selection approach identified confounders and explored effect modification.

Results: Angina prevalence was 16.4%, with higher odds observed in males, older individuals, and those with obesity or diabetes. Smoking status showed a non-significant association with angina in multivariable models (aOR:0.86, 95% CI: 0.73-1.01). However, age and …

Understanding And Mitigating The Potential Effects Of Postpartum Depression On Fathers And Male Support Persons, Rachel Norton-Turk

Capstone Experience: Master of Public Health

Background. During the postpartum period, best practices dictate that medical professionals screen new mothers or birthing persons for anxiety and depression and direct them to the appropriate resources and services they may need. This qualitative study explored the steps being taken to identify depression and anxiety concerns in male support partners during the postpartum period and to understand what resources are being brought to their attention if depression and anxiety are identified. Methods. A convenience sample of male support persons participated in semi-structured, one-on-one interviews either in-person or over Zoom between September and October 2024. Interviews were recorded, transcribed, …