Digital Commons Network^™

Multi-Axis Multi-Material Fused Filament Fabrication With Continuous Fiber Reinforcement, Wout De Backer

Theses and Dissertations

Additive Manufacturing (AM) has become a well-recognized method of manufacturing and has steadily become more accessible as it allows designers to prototype ideas, products and structures unconceivable with subtractive manufacturing techniques for both consumer grade and industrial grade applications. Commonly used thermoplastics for 3D printing have properties that may not be sufficient to comply with the application’s certification requirements, or their performance is less than desirable for aerospace and other high performance applications. Additionally, additively manufactured parts have reduced mechanical properties in the build direction of the print, and are generally weaker than their equivalent injection-molded parts. Furthermore, Computer Aided …

Examining The Evolution Of A Teacher Induction Program In A Diverse, Urban, Southeastern School District, Karen Pack

Theses and Dissertations

Educational institutions struggle to increase student achievement. While the educational needs of students remain at the forefront, teachers’ needs must also be met—before and after entering the classroom. My experience in public education has shown most beginning teachers depend on the support a teacher induction program provides to manage the multitude of new responsibilities faced during the first year in the classroom. Induction programs are constructed and implemented within school districts in a variety of ways. This study is an in-depth analysis that identifies factors that impacted an effective teacher induction program, examines how the program changed as a result, …

Narrating Pain And Freedom: Place And Identity In Modern Syrian Poetry (1970s-1990s), Manar Shabouk

Theses and Dissertations

This dissertation examines poetry of Daʿd Ḥadād, Sanieh Ṣālḥ, and Ryāḍ Ṣālḥ al- Ḥsīn and the dominant role of place in their poetry. My dissertation is specifically interested in nonconformist modern Syrian poetry, especially women’s poetry and poetry focused on place and space. I approach my analysis from an interdisciplinary and comparative perspective and hence will draw on theoretical frameworks from Arabic studies, poetry discourse, and theory of place. Drawing on these different critical frameworks, my research analyzes representations of modern Syrian poetry with a focus on the writing of women and the poetry of nonconformity in its expression of …

Wind Driven Shelf Circulation: Effects Of Shoreline Orientation, Bathymetry, And Surface Cooling, Xiaodong Wu

Theses and Dissertations

The dynamic region extending from the inner- to outer-shelf is the nearshore region where an accurate understanding of the development of cross-shore flows is important as they control the exchange of constituents (e.g., pollutants, larvae, heat and biota) between the coastline and the open ocean. These flows are driven by a variety of forces, including wind and buoyancy. The wind forcing relevant to shelf circulation broadly falls within the synoptic scale of storm events, consisting of frontal systems (cold and warm fronts) and tropical storms. The buoyancy on the shelf is characterized by a vertical stratification or a pronounced cross-shore …

The Effect Of Energy-Matched Exercise Intensity On Brain-Derived Neurotrophic Factor And Motor Learning, Jessica F. Baird

Theses and Dissertations

Brain plasticity is important to motor learning, and is a critical component of motor rehabilitation. Exercise prior to motor training may facilitate plasticity by increasing brain-derived neurotrophic factor (BDNF). However, many studies that have investigated exercise-enhanced plasticity have assessed motor skill performance on tasks involving single finger button presses or small movements of a joystick, results that may not relate to more complex, real-world movements. Additionally, while high-intensity exercise has been shown to benefit motor learning, the effects of low-intensity exercise have yet to be fully investigated. A bout of low-intensity exercise, when completed at an energy expenditure that is …

“An Uphill Battle”: Psychosocial Health And Self-Care Among Advocates Who Work Against Gender-Based Violence In South Carolina, Ebru Cayir

Theses and Dissertations

Gender-based violence (GBV) is one of the most pressing public health and human rights issues in the United States overall, and more specifically, in South Carolina (SC). SC consistently ranked among the highest in the nation in terms of female homicide rates. Non-profit organizations (NPOs) that focus their work specifically on GBV constitute an essential component of prevention and mitigation efforts in SC. Advocates who work for GBV-specific NPOs experience a wide range of psychosocial health and well-being benefits and risks due to their work. This study aimed to: 1) Identify the relationships between engaging in paid GBV-specific advocacy and …

Expanding Our Space: Stories Of Mindful Practice, Emily Jean Whitecotton

Theses and Dissertations

This dissertation tells the story of a qualitative, narrated inquiry study on the narrated experiences of the students and teacher who participated in a mindfulness workshop, designed by the teacher-researcher, and learned within a classroom where the teacher-researcher used mindfulness techniques as a part of their classroom life. This study was designed as an inquiry into the question: How do the students and teacher narrate their experiences as members in a mindfulness workshop over the course of a year? The teacher-researcher collected audio recordings of interviews with participants and whole group discussions that occurred within the workshop and classroom. These …

Integrating Nano-Patterned Ferromagnetic And Ferroelectric Materials For Smart Tunable Microwave Applications, Tengxing Wang

Theses and Dissertations

The wireless communication market has been ever-growing in the recent decades. Radios with high performance and capabilities to support wireless connections are increasingly demanded. Recent developments in wireless communications targeting ubiquitous connections have resulted in ever more complex system structures for supporting multiple frequency bands and standards. Reconfigurable and tunable RF/microwave technologies have the potential to significantly simplify the systems. The main objective of this dissertation is to develop tunable technologies and design concepts, and propose a new design methodology to implement dually electrically tunable microwave components by integrating both selectively patterned ferromagnetic and ferroelectric materials.

The first part of …

Patterns Of Participation And Performance In Youth Baseball Players, Amanda Arnold

Theses and Dissertations

Baseball is a popular sport to play in the United States, with approximately 13-17 million athletes participating across all levels of competition. Youth (9-12 years) and adolescent (13-18 years) players comprise the majority of this population playing at the club and high school levels, yet less than 10% of research studies include athletes <18 years old. Despite increased awareness of the risks surrounding sports participation, youth and adolescent baseball players continue to report overuse injuries at alarming rates.

The lack of high-quality research describing athletic performance and injury risk factors, such as sport specialization, in young athlete populations poses a significant knowledge gap in the literature. The current investigation sought to establish the incidence of upper extremity (UE) injuries while examining population-specific risk factors in …

“Bajan To Gullah” Cultural Capital: Wood, Stone, Iron, And Clay 1670 To 1770, Ramona Arlen La Roche

Theses and Dissertations

British planters, merchants and other non-landholding persons from Barbados owned and transported enslaved persons to the South Carolina colonial settlement as early as 1670. However, there is minimal specific information about Africans or Barbadian Creoles selected for these voyages. To date, no empirical research has examined any data on African or African descended artisans (enslaved or free) who accompanied their owners or authorized travelers to the New World. Such historical lack provides negligible if any recognition of the skillsets rendered by specific artisans that significantly enhanced the economic development of both Barbados initially, and later during the early development of …

Environmental Relationships And Predator-Prey Interactions Within The Snapper-Grouper Complex In The Southeastern U.S. Atlantic – Implications For Fisheries Management, Dawn M. Glasgow

Theses and Dissertations

Stock assessments indicate many valuable fish species are declining, or are considered overfished and/or are undergoing overfishing. Fisheries scientists and managers in the southeastern U.S. typically have utilized a single-species approach, and relied on catch per unit effort data derived from fishery-independent surveys to determine indices of abundance for economically important reef fish. However, catchability for these surveys vary for many reasons including environmental and predator-prey relationships. This research was developed to elucidate environmental influences on reef fish assemblages and distribution of reef-associated marine predators, and examine predator-prey dynamics that may influence relative abundance of large predators based on chevron …

Molecular Evolution Of Major Epidermal Structure Genes And An Integrative Transcriptome Analysis Of Chicken Epidermal Embryogenesis, Weier Bao

Theses and Dissertations

Αlpha (α) and beta (β) keratins are the major structural proteins found in vertebrate epidermis and the β-keratins are only found in reptiles and birds. With the recent published 48 avian genomes, we searched and studied the molecular evolution of these gene families. We discovered that the expansion and contraction of different α- and β- keratins among the 48 phylogenetically diverse birds supports the importance of their role in the evolution of the feathers and the adaptation of birds to different ecological niches. Using a customized 44K microarray, we also performed transcriptome analysis on different epidermal regions (scutate scale, dorsal …

Performance Assessment Of Hsrm Concrete Ties Through Finite Element Model Simulations, Adam I. Zeitouni

Theses and Dissertations

Concrete ties have become a promising alternative to timber ties for freight lines with increased curvature, high annual traffic, and large axle loads. They are also widely adopted in passenger lines. High strength (HS) concrete is the material of choice in the fabrication of prestressed concrete railroad ties. The higher strength of the concrete is directly related to higher values of the Elastic Modulus, thus increasing the rigidity of the material. The combination of increased strength, rigidity, and the material brittleness may lead to the development of high amplitude stresses with high gradients, which appears to be a common underlying …

On The Microstructural Behavior Of Pure Magnesium Under Various Strain Rates, Peter Malchow

Theses and Dissertations

An investigation into the localized microstructural response of pure magnesium under both quasi-static and dynamic loading is presented in the form of several experimental works. The meso-scale events were examined using Digital Image Correlation techniques, which provide a methodology for mapping the in-situ full-field material strain behavior.

Firstly, an analysis of the grain boundary activity specifically under dynamic conditions at high magnification is discussed. An area of interest in the region of multiple grain boundaries and triple junctions is selected for characterizing the evolution of the strain and local rotation. This is followed by a study experimentally verifying the causes …

Pedagogy Of The Transplanted: A Study Of Selected First-Year Jamaican Immigrant Elementary School Teachers And Their Perspectives On South Carolina’S Curriculum Processes, Claudia Fletcher-Lambert

Theses and Dissertations

The study explores the experiences of four first-year Jamaican immigrant teachers in rural southern South Carolina regarding their descriptions of the experiences and the researcher’s observations. The main research question was concerned with first-year Jamaican immigrant elementary school teachers’ experiences as they navigate the curriculum landscape in South Carolina. The inquiry engages a qualitative research design.

Interviews, observations, and artifacts were engaged to collect data. These data were analyzed deductively and inductively through a process of content analysis. These data findings in the study covered four dominant themes these included immigrant teachers’ strengths, challenges, changes, and navigation strategies. The data …

Flannery O’Connor’S Art And The French Renouveau Catholique: A Comparative Exploration Of Contextual Resources For The Author’S Theological Aesthetics Of Sin And Grace, Stephen Allen Baarendse

Theses and Dissertations

Flannery O’Connor described herself as “a Catholic peculiarly possessed of a modern consciousness” (HB 90). What makes her such a fascinating author is that she was almost uncannily sensitive to what Charles Taylor has analyzed in his large study A Secular Age as the fraught spiritual cross-currents of late modernity. Decades before Taylor described the modern secular social imaginary as a haunted space, O’Connor wrote in an essay that “if the South is hardly Christ-centered, it is most certainly Christhaunted” (MM 44). She interpreted the freak “as a figure of our essential displacement” (45). What Taylor works out about the …

Enhanced Dropwise Condensation Via Wettability Contrast Mechanism, Mohammad Alwazzan

Theses and Dissertations

Condensation heat transfer performance can be improved by many methods including the most common used method, which is by increasing the droplet removal rate of the condensing surface. Commonly, this approached can be achieved by promoting a dropwise condensation mode in which super/hydrophobic coatings can be applied on the entire condenser surface to reduce the surface wettability degree. In this dissertation, two main approaches were adapted to enhance the condensation heat transfer performance of the condensing surface via wettability contrast mechanism. Three approaches of investigation were performed to better understand such dropwise condensation promoter methods.

In the first part, alternative …

Marine Phosphorus Biogeochemistry Ecological Insights From Analytical Chemistry, Douglas W. Bell

Theses and Dissertations

The supply of phosphorus (P) directly impacts the growth and speciation of marine microbes (i.e., phytoplankton, bacteria, Archaea). In turn, microbial communities shape the magnitude and rate of marine biogeochemical cycles, ultimately affecting global climate and food production. This dynamic reflects the continuum of temporal and spatial scales at which the marine P cycle operates. However, linking multiple scales of cycling remains a consistent challenge. The primary objective of my dissertation was to gain insight into marine P biogeochemistry, by means of analytical chemistry, at the molecular and environmental scales of cycling. The first component of my research was to …

Mercury Bioaccumulation In Three Popular Subsistence And Recreational Estuarine Fishes From Southeastern U.S.A., Taylor Cannon

Theses and Dissertations

A rising concern in recent years has occurred over the presence of methylmercury in seafood, particularly fishes, and its impact on human health. However, fish also provide many health benefits, including improved cardiovascular health and neurodevelopment. Because fishes are the main source of methylmercury exposure to humans, and are such an integral part of the human diet, understanding the risks versus the benefits of fish consumption is imperative in allowing the public to make healthy, educated choices. One way that state and federal governments attempt to do this is through issuing fish consumption advisories. Unfortunately, these advisories do not always …

Blind Change Point Detection And Regime Segmentation Using Gaussian Process Regression, Sourav Das

Theses and Dissertations

Time-series analysis is used heavily in modeling and forecasting weather, economics, medical data as well as in various other fields. Change point detection (CPD) means finding abrupt changes in the time-series when the statistical property of a certain part of it starts to differ. CPD has attracted a lot of attention in the artificial intelligence, machine learning and data mining communities. In this thesis, a novel CPD algorithm is introduced for segmenting multivariate time-series data. The proposed algorithm is a general pipeline to process any high dimensional multivariate time-series data using nonlinear non-parametric dynamic system. It consists of manifold learning …

Mobile Application For Shipping Goods For Individuals And Truckers In India, Sendurr Selvaraj

Theses and Dissertations

India is a vast country with majority of its cities and towns connected through roads. Road transportation contributes to 86% share of the freight transport of the country with trucking companies dominating the entire space. With growing economy and demands raising, the quality of service of the trucking company remains poor. The major reasons are unorganized practice and lack of transparency. Moreover, limited access for customers to reach out to truckers to transport their goods.

This thesis aims to create a platform for customers and truckers to realize their needs with a help of a mobile application. Customers can search …

Risky Business: Case Study Pedagogy And Business Communication, Jonathan A. Maricle

Theses and Dissertations

When Harvard College built their business school curriculum around case studies and discussion-based classrooms in the early 1900s, it created a radical shift in business school pedagogy throughout the nation due to its ability to prepare students for careers in industry. As case study pedagogy spread to other fields throughout the 20th century, such as medical education and the sciences, these fields extended Harvard's approach in order to create highly effective, field-specific pedagogies. However, business communication is yet to develop their own field-specific approach to case study pedagogy that meets the unique needs of our educators and students. I argue …

Cable Health Monitoring System Built Into Power Converter Using Time Domain Reflectometry, Hossein Baninajar

Theses and Dissertations

Aging cables are a critical reliability concern for many electrical systems. Cables run over long distances, are often exposed to harsh environments and are intended to work for several decades. Cable faults can be a serious problem because cables are usually hard to repair or replace. Condition based maintenance is a popular approach that provides high reliability and low maintenance cost at the same time. This is a non-destructive method that collects information about the health condition of the cable under test without causing any potential damage.

Nowadays, in several applications power cables are connected to power converters and it …

Co2 Capture From Flue Gas By A Psa Process Using A Novel Structured Adsorbent, Nima Mohammadi

Theses and Dissertations

First adsorption equilibrium isotherms for N2, O2, Ar and CO2 on zeolite 13X were measured at three temperatures (25, 50, 75 °C) and pressures up to 110 kPa with a volumetric method and validated by also measuring the same isotherms with a gravimetric system.

Then a comprehensive 2-D mathematical model was developed to study the fundamentals of adsorption processes in parallel channel structured adsorbents. The results clearly indicated that under studied circumstances the plug flow condition can be assumed and therefore the system is not subject to premature breakthrough.

The pressure drop of corrugated structured adsorbents with narrow triangular channels …

The Effects Of Student Involvement In Writing Topic Selection On Achievement And Motivation, Henry D. Tindal

Theses and Dissertations

This action research study examined 18 high school student-participants’ perceptions of essay writing both with teacher-generated standardized prompts and prompts where students were included in the development of the writing assignment. The students consisted of 12 white females, 2 Asian females, and 4 white males enrolled in an Advanced Placement English Language and Composition class from a rural, southern school located in South Carolina. Quantitative methods were used to determine the impact of the prompts on the students’ motivations for writing essays. Writing samples, surveys and observations comprised the data. Teacher-participants and instructional leaders reflected on the data with the …

Emergence Of Stranger Fear In Preschoolers With Fragile X Syndrome And Idiopathic Autism Spectrum Disorder, Jessica Scherr

Theses and Dissertations

This study investigated multiple behavioral indicators of social fear and their relationship to symptoms of autism in preschool boys with atypical and normative development using a stranger approach design. Participants consisted of 101 male preschoolers that were categorized into four groups: boys with fragile X syndrome (FXS; N= 29), FXS with elevated autism symptoms (fxASD; N = 25), idiopathic autism spectrum disorder (iASD; N = 11), and typically developing boys (TD; N = 36). Results indicated specific behavioral responses to a stranger differentiated preschoolers with more severe symptoms of autism (e.g. fxASD and iASD groups) from those with low autism …

Supercritical Carbon Dioxide Treatment Of Natural Biomaterials For Tissue Engineering Applications, Dominic M. Casali

Theses and Dissertations

The number of people requiring an organ transplant in the United States has increased considerably over the past 25 years, but the number of organ donations has stagnated; over 8,000 people now die annually while awaiting a transplant or become too sick to receive one. Tissue engineering (TE), the design and production of artificial tissues and organs in vitro, has been proposed to alleviate this problem. Though synthetic polymers offer tunable mechanical and biochemical properties, natural biomaterials have recently garnered attention in TE for their high degree of biocompatibility and ability to direct cell proliferation and constructive tissue remodeling. Yet …

The Act Keytrain Program And The Act Workkeys Test Performance: An Action Research Study, Matthew T. Thompson

Theses and Dissertations

The purpose of this quantitative action research study was to describe the effectiveness of the American College Testing (ACT) KeyTrain program in the South Carolina Department of Corrections (SCDC), conducted with 50 inmate-student-participants who were enrolled in the Palmetto Unified School District’s Tyger River High School’s (TyRCI) adult education program. The identified problem of practice for this dissertation in practice (DiP) was an evaluation of the effectiveness of this program for one group of low socioeconomic status Black male inmate-student-participants. This evaluation was of vital importance to the Palmetto Unified School District (PUSD) and SCDC because ACT WorkKeys is one …

The Private University Faculty Perspective Of Community College Transfer Students: An Ethnographic Interview Study, Sally E. Hyatt

Theses and Dissertations

Faculty/student relationships have a significant impact on student retention and success (Tinto, 1975, 1993). However, little is known about how faculty perceive community college transfer students and how they make meaning of their interactions with these students. This qualitative, descriptive, ethnographic interview study describes faculty/student interaction and the ways in which community college transfer students are perceived by the faculty at one small, private, nonprofit, masters-level university. The research questions used for this study were designed to investigate the faculty’s perception of community college students, the students’ academic experiences and the faculty/student relationship.

The researcher gathered data during 12 in-depth …

African American End-Stage Renal Disease And Medication Adherence: What Are The Effects Of Everyday Racism?, Tamara Estes Savage

Theses and Dissertations

This dissertation explored the racial medication adherence disparity in end-stage renal disease (ESRD) patients. Prior research suggests that there are poor rates of medication adherence in the African American ESRD population. However, the reasons for this racial inequity are not understood. This dissertation explored the impact of everyday racism in the healthcare system in general and dialysis centers in particular on medication adherence. To gain an understanding of the possible contribution of everyday racism to medication nonadherence, Critical Race Theory (CRT) was used as the theoretical foundation of the study.

A total of 46 African American ESRD patients participated in …