Digital Commons Network^™

Sustainable Polymeric Materials Derived From Plant Oils: From Synthesis To Applications, Xinzhou Zhang

Theses and Dissertations

In this thesis, monomers and polymers derived from high oleic soybean oil are investigated. The properties of these monomers and polymeric materials are characterized and discussed. Chapter 1 describes an overall background of bio-based resources, monomers, polymers, and their potential impact on society. The overall objective of my research is described. Chapter 2 outlines a new large-scale preparation of a soybean based monomer and the use of this monomer in thermoplastic elastomers. The synthetic procedures and characterizations of the monomers and polymers are discussed. In Chapter 3, potential applications of soybean oil monomers in both supramolecular polymers and poly(phosphoester)s are …

Software Modelling For Real World Faults On Ac Transmission Protective Systems Analysis And Effects, Iandale Tualla

Theses and Dissertations

The Electric Power Utilities serves many diverse customers from regular households to major processing plants that develop parts for gasoline vehicles. Those varying customer usages has adverse effects on the Electric Grid in many ways, that requires continuing analysis by the engineers and technical skills specialists who keep the Electric Grid stable. Several papers have been written about harmonics and Non- Sinusoidal waveforms and its effect on the Electric Grid. This thesis will exam a realworld fault event on a transmission line, its effects on the AC Transmission Protection Systems (TPS) that provides electrical energy to a nonlinear load, specifically …

Product Qualification And Performance Assessment Of Hsrm Prestressed Concrete Railroad Ties Through Laboratory Testing, Ali Haider Abdulqader

Theses and Dissertations

This study focuses on the performance assessment of prestressed concrete railroad ties made of a newly developed High Strength Reduce Modulus (HSRM) concrete. The HSRM material has been developed by researchers at the University of South Carolina laboratories. The HSRM material was originally considered as a high-performance concrete for highway bridge girders, but it was rejected because it shows very low modulus of elasticity. A current project at USC proposed to use this HSRM material in prestressed concrete railroad ties. The experimental tests during the material development phase of the project showed that the HSRM-HPC has a reduced Modulus of …

Scribes Impact On Patient And Provider Experience In The Outpatient Setting, Kimberly A. Taylor

Theses and Dissertations

The purpose of this project was to evaluate the effectiveness of using scribes in the outpatient setting on patient and provider experience. A mixed methods approach with a convenience sample of voluntary patient participants scheduled for an outpatient appointment was utilized. Two primary care physicians volunteered to receive scribes. Four hospital corpsmen were selected and trained to serve in the scribe role.

This quality improvement project evaluated two aspects of experience during the implementation of the scribes. These included: 1) patient experience as indicated via a pre and post implementation questionnaire; and 2) provider experience as indicated via a pre …

The Impact Of A Close Reading Approach On The Comprehension Level Of English I Students At Wavers High School, Tina Marie Janus

Theses and Dissertations

The purpose of this study was to examine the impact a close reading approach had on the reading comprehension levels of twelve English I students. Studies in literacy theory have suggested that students’ reading comprehension levels improve with the use of reading strategies. As part of a larger body of research concerning reading instruction for secondary students, there is a need for older readers to learn comprehension strategies specific to reading content subject matter (Shanahan & Shanahan, 2015; Duke & Martin, 2015; Ness, 2007). Using a mixed-methods approach, the data collection consisted of pretest/posttest instruments, field observations, existing records, surveys, …

Multi-Model Structural Analysis, Wesley Holt

Theses and Dissertations

The uncertainty in modeling earthquake loading is investigated through the comparison of various openSEES models. A series of models is created and the responses compared with each other as well as with a full scale shake table experiment. The openSEES models selected for comparison include two linear models, a nonlinear model using the Steel01 material for the entire cross section, and eight fiber models using reinforcing steel material and various concrete materials.

The models are subjected to a series of nine simulated earthquakes, matching the excitations applied to the shake table test. It is found that all of the models …

The Contextual Impact Of Innovation And Operational Spillovers On Firm Performance, Cherry Singhal

Theses and Dissertations

Extant literature across various research disciplines has investigated the influence of a firm’s technological innovation on its performance. However, the findings on this relationship remain inconclusive as it is subject to many strategic and environmental factors. In this dissertation, the relationship between a firm’s technological innovation and performance is evaluated. Additionally, this relationship is examined in the presence of various contextual factors.

In the first study, meta-analysis is utilized to quantitatively aggregate existing empirical research in this domain. Cultural and institutional aspects of the nation in which the firm operates are examined for their potential in explaining variability within the …

Characterization Of The Suf Fe-S Pathway In Escherichia Coli, Naimah Bolaji

Theses and Dissertations

Iron is an essential transition metal required by almost all organisms for use as a cofactor in many metabolic processes such as respiration and photosynthesis. Iron can be combined with elemental sulfur to form an iron-sulfur (Fe-S) cluster. In bacterial pathogens, Fe-S cluster cofactors carry out critical functions and the Fe-S cluster biogenesis pathway is essential for their survival. In E. coli, the Suf pathway assembles Fe-S clusters under conditions of iron starvation and oxidative stress. While some mechanistic details of the Fe-S cluster biogenesis have been well-characterized, the process of in vivo iron donation remains unclear. Iron storage proteins …

Trends In Gestational Weight Gain In South Carolina, 2004 - 2015, Marilyn Elizabeth Wende

Theses and Dissertations

Objective: Excessive and inadequate gestational weight gain (GWG) are associated with a myriad of adverse pregnancy outcomes. The objective of this study was to examine secular trends in GWG in South Carolina (SC) from 2004 to 2015. We hypothesized that there was a trend of higher GWG z scores (GWGZ) over this 11-year time period after adjusting for changes in population characteristics. We also hypothesize that a trend of higher mean GWGZ at higher percentiles is more apparent for African Americans, rural women, and women who are overweight or obese before pregnancy.

Data and Methods: Data came from SC …

Improving Facial Action Unit Recognition Using Convolutional Neural Networks, Shizhong Han

Theses and Dissertations

Recognizing facial action units (AUs) from spontaneous facial expression is a challenging problem, because of subtle facial appearance changes, free head movements, occlusions, and limited AU-coded training data. Most recently, convolutional neural networks (CNNs) have shown promise on facial AU recognition. However, CNNs are often overfitted and do not generalize well to unseen subject due to limited AU-coded training images. In order to improve the performance of facial AU recognition, we developed two novel CNN frameworks, by substituting the traditional decision layer and convolutional layer with the incremental boosting layer and adaptive convolutional layer respectively, to recognize the AUs from …

The Association Of Changes In Cardiorespiratory Fitness With Changes In Cardiometabolic Risk Factors, Leanna Marie Ross

Theses and Dissertations

Cardiorespiratory fitness (CRF) is well established as having a strong inverse association with numerous cardiovascular disease (CVD) risk factors and mortality. As CVD remains the number one cause of death in America, the detrimental effects of low CRF present a substantial health threat. The studies presented in this dissertation syndicate both epidemiologic and clinical data that will enrich the knowledge base regarding the magnitude of change in CRF in relation to CVD risk factors.

Recently, the American Heart Association established a new construct termed ideal cardiovascular health (CVH), which is characterized by seven metrics known as Life’s Simple 7. The …

Marginal Structural Cox Model For Survival Data With Treatment-Confounder Feedback, Yanan Zhang

Theses and Dissertations

In an observational longitudinal study, there can be time-varying exposure/treatment and time-varying confounders. When the confounders affect the exposure and prior exposure also has an impact on levels of confounders, there is treatment confounder feedback. To admit estimation of unbiased causal effects, these conditions need to be hold, exchangeability, positivity, consistency. The traditional method of conditioning on potential confounders does not meet these 3 conditions. Therefore, parameter estimates from traditional Cox model are biased casual effect estimates when the treatment confounder feedback exists. The marginal structural Cox model can be used to address this issue. By calculating and including inverse …

Exploratory Modeling Of Environmental And Anthropogenic Impacts On Mercury In Fish Tissue For Select Watersheds In South Carolina, Julia Mcguire

Theses and Dissertations

Fish tissue from various sampling locations in South Carolina rivers has shown elevated levels of mercury (Hg). A number of variables may impact this Hg in fish tissue and this study evaluated the impact of these variables using a predictive model. Over 341 variables were assembled from 6 different databases describing land use, water chemistry, point source pollutants, watershed characteristics and more. One dataset describes the location of historical gold mines throughout the sample site, which have been shown to increase Hg in fish tissue in other locations. The variables were assembled in ArcGIS to evaluate variable significance and to …

The Relationship Between Gender Stereotypes And Academic Performance For Rural Eighth Grade Students: A Mixed Methods Ethnographic Case Study, Elizabeth Anne Royal Witte

Theses and Dissertations

Through this mixed methods ethnographic case study, the subject of gender stereotypes for middle school students, and its relationship to academic performance was investigated. Specifically, the research focused on Albert Bandura’s (1977) Social Learning Theory, gender stereotypes, and how educational institutions, peer relationships, and parental influences may dictate gender norms as they relate to academic success. It also attempted to evaluate the relationship between the issue of gender stereotypes and current experiences in a rural American middle school that led to the recurring issue of the educational gender gap and the underperformance of male students. The purpose of the study …

Improved N-Type 4h-Sic Epitaxial Layer Radiation Detectors And Noise Analysis Of Front-End Readout Electronics, Khai V. Nguyen

Theses and Dissertations

Schottky barrier radiation detectors were fabricated on n-type 4H-SiC epitaxial layers (12 – 50 μm) grown by hot wall CVD process on highly nitrogen doped 4H-SiC (0001) substrates with 4-8º off-cut towards the ̅ direction. Ni/4H-SiC Schottky barrier radiation detectors, a very low leakage current of 0.18 nA at 250 V bias, revealing low thermal noise, was observed in current-voltage (I-V) measurements. Using a thermionic emission model, junction properties such as barrier height of ≥1.10 eV and an ideality factor of ≤1.29 were determined. An effective carrier concentration of 1.03×1015 cm-3 was calculated by capacitance-voltage (C-V) measurement. Deep level transient …

Association Of Provider Communication And Inpatient Hospital Readmissions, Jeremy Dean Faulkenburg

Theses and Dissertations

Introduction: Inpatient hospital readmission rates represent an important clinical and economic problem. Clinical interventions have shown significant decreases in preventable readmissions, but are costly to implement. Another approach is to better equip patients with the knowledge and resources to manage their care after discharge. Patients receive instruction from both nurses and physicians, as well as information pertaining to post-discharge care and instructions for care while at home. This study examines the association between provider communication and inpatient hospital readmissions.

Methods: This study used survey data from the 2013 and 2014 Hospital Consumer Assessment of Healthcare Providers and Systems (HCAHPS). The …

Modulation Of Pkr Activity During Hiv Infection And Cellular Stress By Pact And Trbp, Evelyn E. Chukwurah

Theses and Dissertations

A crucial component of the cellular response to stress is the attenuation of protein synthesis to allow the cell to dedicate resources for the restoration of homeostasis or towards the induction of apoptotic cell death in case the stressors overwhelm the cell. This process is itself regulated by one of the four eIF2α kinases of which PKR (Protein Kinase R) is responsible for inhibiting general translation during viral infection, oxidative stress, ER stress, heat shock or serum withdrawal.

During viral infection, PKR is transcriptionally induced by interferon but remains latent until it interacts with dsRNA. This interaction induces a conformational …

Progressive Failure Analysis Of Composite Materials Using The Puck Failure Criteria, Karan Kodagali

Theses and Dissertations

Fiber reinforced composites have been used in various engineering structures and applications especially in naval, automotive, aeronautical and sports industries. These composite materials generally exhibit brittle damage behavior. The anisotropy in the material and different kinds of failure mechanisms make it difficult to accurately characterize the behavior of composite materials. The present work aims to verify and apply the Puck Failure Criteria using the commercially available finite element package ABAQUS by writing a user-material subroutine in FORTRAN. The model is implemented with different post failure degradation schemes.

In the present work, the progressive failure on composite materials in analyzed using …

Exploring The Professional Identity Of Examplar Novice High School Counselors, Kimberly A. Nelson

Theses and Dissertations

This phenomenological study investigated how exemplar novice high school counselors described the development of their professional identities. Through interviewing high school counselors who have been practicing between 1 to 5 years, experiences and themes emerged to understand the process of how exemplar novice high school counselors developed a professional identity. Through the themes, researchers will analyze whether novice high school counselors benefited from certain courses as trainees, current job experiences and professional involvement in developing their professional identities.

The Influence Of Testing And Content Presentation Method On Mandatory Federal Employee Training, Corey Patrick Boswell

Theses and Dissertations

A substantial amount of evidence exists suggesting that including tests as part of learning events can promote greater long-term retention (known as the “testing effect”). In the current study, the testing effect was analyzed in the context of mandatory federal legal training. The classic information processing perspective provided a theoretical backdrop for the experimental design. Participants (N = 383) received specialized training content through one of three modalities (text-, audio-, or video-based). Additionally, instructional style (test vs. no-test) was manipulated in conjunction with content presentation method. It was predicted that participants would perform better on the final assessment in conditions …

Curricula As Complements: Inclusive Content-Based Literature And The Goals Of Common Core In Secondary Students’ English Achievement, Sara Lott

Theses and Dissertations

The Common Core State Standards now suggest a 70% nonfiction, 30% fiction reading load for 6th to 12th grade students (Common Core State Standards Initiative, 2017). To satisfy this curricular push toward nonfiction, many secondary English teachers are shifting away from inclusive literature instruction to a more standardized English Language Arts (ELA) model based on Common Core’s five strands for ELA: reading informational text, reading literature, writing, language, and speaking and listening. This ideological and practical shift within secondary ELA has created a local-level problem of practice. Owing to Common Core’s relative silence on issues of diversity, shifts away from …

Developing And Implementing A Quality Assurance Strategy For Electroconvulsive Therapy, Jessa Hollingsworth

Theses and Dissertations

The literature provides scant guidance in effective quality assurance strategies concerning the use of electroconvulsive therapy (ECT) for the treatment of psychiatric conditions. Numerous guidelines are published that provide guidance in the delivery of care, however, little has been done to determine how a program or facility might ensure compliance to best practice for safety, tolerability, and efficacy in performing ECT. The objective of this project was to create a quality assurance strategy specific to ECT. Determining standards for quality care and clarifying facility policy were key outcomes in establishing an effective quality assurance strategy. An audit tool was developed …

An Investigative Study Measuring Self-Reported Metacognitive Habits Among Collegiate Piano Majors, Steven Phillip Brundage

Theses and Dissertations

The purpose of this study was to investigate self-reported metacognitive habits among collegiate piano majors. It examined the degree to which participants comprehend and employ practice strategies, recognize their own strengths and weaknesses in learning and performing, accurately predict a performance outcome, and self-evaluate following a performance. A total of twelve (N = 12) participants, six (N = 6) undergraduate and six (N = 6) graduate piano majors, enrolled in applied lessons at the University of South Carolina School of Music volunteered to participate in this study. Participants completed a pretest questionnaire that measured their own metacognitive skills, performed and …

Development Of An Estrogen-Related Dietary Pattern And Lifestyle Score To Examine Breast Cancer Risk In Postmenopausal Women, Mark Andrew Guinter

Theses and Dissertations

Introduction: Studies examining the association between individual dietary components and breast cancer have been inconclusive. The use of dietary patterns is a holistic approach which may yield stronger associations. We sought to develop a dietary pattern based on an estrogen metabolite (EM) profile hypothesized to increase breast cancer risk (high unconjugated estradiol and low ratio of 2- to 16-hydroxylated EMs (2/16 ratio)). This estrogen-related dietary pattern (ERDP) was examined for associations with postmenopausal breast cancer in two study populations and was incorporated into an estrogen-related lifestyle score (ERLS) with other modifiable risk factors for breast cancer.

Methods: EM …

Development Of A Sandwich Hybridization Assay For The Harmful Cyanobacteria Microcystis Spp., Nicole M. Dearth

Theses and Dissertations

Cyanobacteria are responsible for the largest number of harmful blooms (HABs) worldwide. HABs caused by the genus Microcystis pose public health threats because they often occur within close proximity to humans and produce microcystin (hepatotoxin), which can contaminate drinking water and recreational areas. Novel molecular techniques facilitate monitoring, ‘early warnings’ of HAB events, and appropriate management responses. Sandwich hybridization assay (SHA), the technique considered here, directly (no amplification) identifies and quantifies planktonic species using ribosomal RNA (rRNA)-targeted oligonucleotides. This project developed SHA for Microcystis 16S rRNA and validated the assay using laboratory cultures and samples from a multi-specific cyanobacteria bloom …

Investigation Of Iron(Ii) Autoxidation Rate And Iron Mediated Geochemical Production Of Reactive Oxygen Species At Oxic-Anoxic Interfaces, Dewamunnage Muditha Chathurangani Dias

Theses and Dissertations

Biogeochemical cycles in ecosystems regulate the flow of energy between reduced species (typically carbon compounds) and a variety of oxidants via both biotic and abiotic reactions. A key class of chemical compounds that can link these cycles through abiotic pathways are Reactive Oxygen Species (ROS). The production of ROS via photochemical pathways is well known. More recently, the non-photochemical production of ROS via the one electron oxidation of ferrous iron (Fe(II)) by dioxygen (O2) has been detected in a range of environments. The oxidation of Fe(II) initiates a pathway that generates an array of ROS as Fe is cycled between …

Investigate Genomic 3d Structure Using Deep Neural Network, Yan Zhang

Theses and Dissertations

The 3D structures of the chromosomes play fundamental roles in essential cellular functions, e.g., gene regulation, gene expression, evolution and Hi-C technique provides the interaction density between loci on chromosomes. In this dissertation, we developed multiple algorithms, focusing the deep learning approach, to study the Hi-C datasets and the genomic 3D structures.

Building 3D structure of the genome one of the most critical purpose of the Hi-C technique. Recently, several approaches have been developed to reconstruct the 3D model of the chromosomes from HiC data. However, all of the methods are based on a particular mathematical model and lack of …

The Role Of Lipocalin-2 In The Hepatic Microenvironment Of Colorectal Cancer Metastasis, Daniel Titus Hughes

Theses and Dissertations

Colorectal cancer (CRC) is the second leading cause of cancer deaths in the United States. The major cause of death is metastasis and the frequent target organ is the liver. When diagnosed early at a localized stage, the five year survival rate after resection is 90%. However, after metastasis has occurred, this drops to less than 12%. Metastasis is often asymptomatic and diagnosed at the final stage when therapeutic options are limited. Because of this, the genetic and cellular mechanisms regulating metastasis are still poorly understood. Recent studies have shown that prior to the arrival of cancer cells at the …

Antecedents Of Adolescents’ Gratitude: Personality, Social Support, And Stressful Life Events, Hannah Reckart

Theses and Dissertations

An increase in the emphasis of positive aspects of functioning has led to expanded attention paid to the field of positive psychology. Within in this arena, the construct of gratitude has emerged as a factor of interest, specifically in adults; however, while a basis for research of gratitude in children exists, it is lacking in breadth. Support for gratitude’s significant relations with psychosocial, psychological, and academic factors has been shown in prior research, and presumed personal and environmental antecedents of gratitude have been indicated. The present study was exploratory in nature and included a sample of 1506 students from four …

Muscarinic Acetylcholine Receptor M1’S Impact On Fear Extinction Learning, Joshua R. Mcelroy

Theses and Dissertations

Post-Traumatic Stress Disorder (PTSD) is a mental health disorder that can occur following a traumatic event like combat, assault, or disaster. Individuals with PTSD are unable to extinguish fear memories which can become chronic and disabling. However, it remains unclear why some individuals exposed to a traumatic event develop PTSD while others are resilient. Acetylcholine plays a critical role in fear learning, but its role in fear extinction is less well understood. In this investigation, we used a rat model of fear extinction to determine if individual differences in extinction learning are correlated with markers of cholinergic signaling. Cholinergic markers …