Digital Commons Network^™

Investigation Of Geopolymer Based Soil Stabilization Methods For Expedient Airfield Pavement Surfaces, Brett Albertson

All Theses

The United States Air Force (USAF) has the unique capability of being able to interdict superior airpower anywhere, at any time. However, superior airpower is only as effective as the amount of time an aircraft can spend in a particular area. The closer an aircraft can get to the mission need, the more time that can be spent in the air, or the less time that must be spent moving in and out of the operational area. Through the use of skilled and experienced men and women, the USAF is able to apply expedient and unsurfaced airfield paving techniques that …

Flexural Testing Of Precast Reinforced Concrete Bridge Slabs, Evaluation Of Deterioration And Strengthening Applications, Alyssa Leaman

All Theses

This thesis investigates the strength of flat precast concrete slabs that were taken from decommissioned South Carolina bridges. The specimens tested spanned 14 ft (4.3 m) or 15 ft (4.6 m), were 5 ft (1.5 m) or 5.5 ft (1.7 m) wide, and 8.25 in (210 mm) thick. In South Carolina, there are approximately 3000 similar bridges that use these slab members. Testing was conducted to determine the flexural capacity of “typical” slabs and the residual strength of slabs having visible deterioration of both the rebar and the concrete. For the slabs that were load rated below the new standards, …

Evaluation Of Novel Management Options For Bacterial Spot Of Peach, Daniela Moreno

All Theses

Xanthomonas arboricola pv. pruni (Xap) is an economically important pathogen causing bacterial spot of stone fruits worldwide. In the southeastern US management for this disease relies on copper and oxytetracycline (OTC) sprays, yet disease incidence remains high especially when the environmental conditions are conducive (warm and rainy). To further complicate disease management copper tolerant and OTC resistant (OTC^R) strains of Xap have been reported in the southeastern peach orchards. complicating disease management. Therefore, we aim to evaluate potential chemical and biological alternatives for disease management. The first objective was to evaluate a novel nano nanoformulation Bz (Zinc Borate) …

Serious Leisure, Job Task Load, & Satisfaction, Carson Matsick

All Theses

The study examined the relationship between degree of leisure seriousness and leisure, job, and life satisfaction, as moderated by perceived job mental workload. Serious leisure has largely been studied in reference to general life satisfaction and health outcomes, and less research exists to examine whether serious leisure participation may influence work. This study tested the following hypothesis: the relationship between serious leisure participation and employee well-being is moderated by mental workload on the job, such that a) as mental workload increases, then serious leisure participation and satisfaction will be less strongly positively correlated, and b) as mental workload decreases, then …

Understanding Movement, Habitat Use, And Habitat Selection By Largemouth Bass (Micropterus Nigricans X Salmoides) And Alabama Bass (Micropterus Henshalli) On Lake Hartwell, South Carolina, Deon Kerr

All Theses

Alabama Bass (Micropterus henshalli) were illegally introduced into the upper Savannah River Basin 15-20 years ago and have since become abundant as well as problematic ecologically. Acoustic telemetry was used to quantify diel movement, habitat use, and habitat selection of Alabama Bass and Largemouth Bass in Lake Hartwell, SC across seasons (June 2021-July 2022) with the goal of informing ongoing habitat enhancement efforts. Across all seasons, Alabama Bass conducted diel horizontal migrations from deeper offshore habitats during the day to nearshore, shallow habitats at night. Daytime Alabama Bass movement rates in offshore waters were higher than nighttime movement rates. Largemouth …

Utilizing Systematic Design And Shape Memory Alloys To Enhance Actuation Of Modular High-Frequency Origami Robots, Jessica M. Den Haese

All Theses

Shape memory alloys (SMAs) describe a group of smart metallic materials that can be deformed by external magnetic, thermal, or mechanical influence and then returned to a predetermined shape through the cycling of temperature or stress. They have several advantages, such as having excellent mechanical properties, being low cost, and being easily manufactured, while also providing a compact size, completely silent operation, high work density, and requiring less maintenance over time. SMAs can undergo sold-to-solid phase transformations, and it is because of these phase transformations that they can experience shape memory effect (SME); or the ability to recover from a …

An Economic Impact And Investment Analysis Of Armillaria Root Rot In The United States Peach Industry, Gracie Herrin

All Theses

Peach production in the United States has decreased over the last decade due to increased disease prevalence. Armillaria root rot (ARR) is a lethal root fungus that affects many stone fruits, including peaches, often leading to rapid decline/death of trees and abandonment of orchards. This thesis is divided into four chapters which focus on answering four key questions that, to the best of my knowledge, have not been addressed in previous industry research.

The second chapter determines the magnitude of ARR disease prevalence in the United States and producers’ maximum willingness to pay (WTP) for a theoretical ARR-resistant rootstock. Results …

An Application Of Optimized Bistable Laminates As A Low Velocity, Low Impact Mechanical Deterrent, Graham Lancaster

All Theses

This research considers the problem of using bistable laminates as a mechanical deterrent to the impending impact of a particle. The structure will be controlled through an algorithm that will utilize piezoelectric devices to activate them in unison with the bistable laminate to successfully deter. A novel experimental setup will be constructed to ensure that the bistable laminate stays fixed when acting as a mechanical deterrent. Piezoelectricity is the main driving force of the bistable laminate to morph and this study will use a Macro Fiber Composite (MFC) actuator that contains piezoelectric ceramic rods in a patch to transfer electrical …

Synthesis And Characterization Of Vo2 Thin Films On Piezoelectric Substrates, Samee Azad

All Theses

Polycrystalline VO₂ thin films synthesized on two piezoelectric substrates (AT-cut quartz and GaN/AlGaN/GaN/Si) using low pressure direct oxidation technique have been characterized and compared to VO₂ grown on traditional non-piezoelectric substrates sapphire and SiO₂/Si. X-ray diffraction and atomic force microscopy characterization performed on the as grown films confirmed high quality of the VO₂ films grown on both the piezoelectric and non-piezoelectric substrates. Changes in material properties associated with the semiconductor metal transition (SMT) of the VO₂ films were investigated through resistivity and transmitted optical power changes measured across the SMT. It was observed that …

Flexural Bond Strength Of Masonry Assemblies With Lightweight Grout, Benjamin L. Hiner

All Theses

Lightweight grout has many potential benefits in masonry construction, including minimizing mass, improving thermal performance, and potentially reducing shrinkage cracking via internal curing. However, insufficient testing of masonry assemblies with lightweight grout has been conducted to suggest appropriate design modification factors akin to the lambda factor in ACI 318-19. The objective of this paper is to study the tensile bond behavior of masonry assemblies grouted with lightweight grout and to suggest appropriate equations for predicting design capacity. A moment couple test is designed specifically for grouted masonry assemblies and has additional capacity compared to the traditional ASTM 1072 bond wrench …

Barriers And Facilitators In Implementing Multiplatform Remote Patient Monitoring Of Heart Failure Patients In Clinical Settings, Zachary Andrew Reilly

All Theses

Remote patient monitoring (RPM), which provides continuous monitoring of vital signs, has become increasingly utilized in patients with heart failure (HF). As this condition impacts more than 26 million Americans each year, it is important to determine the barriers and facilitators of RPM to both improve patient care and help medical professionals make more informed medical decisions. To determine these barriers and facilitators, our research team partnered with Prisma Health-Upstate to interview healthcare professionals working at Carolina Cardiology Consultants--Greenville, which uses multiple RPM systems to monitor heart failure patients.

The twelve interviews conducted support that healthcare professionals would benefit from …

Characterization Of Colletotrichum Nymphaeae Isolates From Apple With Reduced Sensitivity To Fluazinam And Tebuconazole, Rulyu Meng

All Theses

Apple bitter rot is caused by Colletotrichum nymphaeae and other Colletotrichum species and management relies primarily on synthetic pesticides. Very few fungicides are effective against the disease and resistance has further limited their usefulness. A recent study indicated relatively low EC₅₀ values (the concentration required to inhibit 50% of mycelial growth in vitro) of C. nymphaeae isolates from Brazilian apples to fluazinam and tebuconazole, two fungicides that are not routinely used for bitter rot control. Isolates on opposite sides of the sensitivity range were designated either sensitive (lowest EC₅₀ values) and reduced-sensitive (highest EC₅₀ values). The objective …

Surrogate Modeling Of Nonlinear Components And Circuits, Byron William Byars

All Theses

Surrogate models are simplified approximations of functions that are described by complex equations. Surrogate modeling of physical systems have been used in various fields such as biology, fluid dynamics, climate modeling, and various other engineering disciplines. This data-driven approach is used to decrease computational cost, decrease computation time, or when the output of a system is diffcult or impossible to measure, by using a \black-box" method to approximate the output given inputs. In regards to circuit analysis, surrogate models can be used to decrease computation time and computational load.

In this thesis, surrogate modeling is used to model various nonlinear …

Designing The House Of The Future: Social Commentary On Retrofuturism, Alyssa Woodruff

All Theses

This project explores the aesthetics of retrofuturism and the historical context of the house of the future. Retrofuturism captures how people perceived the future during previous eras in history. Conceptions of the future reflect the time period in which they are created. I designed and implemented a 3D model of a house of the future to express the aesthetics of mid-century modernism. I created the models in ZBrush and Maya. I took inspiration from The Jetsons cartoon, the New York World’s Fair of 1964-65, and Disneyland’s original Tomorrowland theme park. This project also incorporates contemporary features to reflect modern concerns. …

The Greek Merchant Marine: A Unique Combination Of Nautical Skill And Commercial Savvy, Alexander Billinis

All Theses

The Greek-owned merchant fleet remains the world’s largest, and while plenty of histories have been written about this fleet, there is a definite absence in the historiography about why the Greeks’ relation to the sea is unique, and how this fleet came into existence. The author argues that the Greek merchant fleet is a successful hybridization of a commercial middleman minority ethos born out of conditions in the Ottoman Empire and post-independence Greece, combined with the shipping skills of a littoral people who invested in this expertise.

To understand the how and why of the Greek merchant fleet, it is …

Supporting Us Army Next-Generation Ground Vehicle Simulation Modeling Using An Integrated Ontology Suite, Edward Louis

All Theses

The development of the US Army’s next-generation of ground vehicle systems is supported by simulations that predict vehicle performance and inform engineering design choices in the design and acquisition process. In this paper, we describe the development of an Integrated Ontology Suite to support modeling and simulation of next generation military ground vehicles. The ontology suite is intended to address model reuse challenges and increase the shared understanding of ground vehicle system simulations. It is intended to function in a Model Library structure that stores, documents, assembles, and executes vehicle simulations. The ontology suite consists of four domain ontologies: Vehicle …

Unmanned Ground Vehicle Proximal Sensing For Forage Biomass Production Estimations, Curtis Erwin

All Theses

A large increase in productivity could be realized by small increases in efficiency and utilization on grasslands due to their large area. Pre-harvest biomass estimations can help forage producers make better informed management decisions. Producers of dry hay and hay silage can better identify plant growth stages and the optimal time to harvest. Grazers can better determine the most efficient number of animals and stocking density. The goal of this study was to create a novel pre-harvest biomass estimation method utilizing compressed height combined with an unmanned ground vehicle (UGV). A compression plate named a “compression ski” was constructed and …

Strangers Switching Their Identities: Cultural Identity Management And Performance On Social Media A Qualitative Analysis Of International Students’ Intercultural (Ex)Change Processes And Perceptions Regarding Their Stay In The United States And Countries Of Origin, Vivian Kretzschmar

All Theses

In this globalized world, cross-country travel for education has been a prevalent (5.6 million students identified as international students in 2020) and ever-increasing (with a predicted increase of 250% by 2030) trend through the past decades. The sojourn impacts the students’ experience of the new culture and the ensuing shocks and adaptations. The understanding of something as complicated as culture, trying to be integrated into a new culture, and its perception to individuals, of course, have their ways of distinct communication trends through social media.

The struggle of maintaining and changing one’s cultural identity and adaptation across cultures has been …

Why Can't We Be Friends: A Training Evaluation Of Community Dialogues, Kyle Christenson

All Theses

Demographic and attitudinal diversity can be powerful tools within the team and organizational contexts. However, when not addressed effectively, diversity can greatly strain interpersonal relations and has been found to lead to a number of negative consequences at the individual, team, and organizational levels (Roth, Goldberg, & Thatcher, 2017; Harrison & Klein, 2007). Though there have been attempts to effectively mitigate these negative outcomes, few have found lasting success (Kessler, 2021). However, a training for students offered at a university nested in the southeastern region of the United States offers a relatively novel approach to handling these interpersonal differences. The …

Effects Of Surface Noise On Printing Artifacts: An Artistic Approach To Hiding Print Artifacts, Samuel New

All Theses

This research focuses on improving the quality of Fused Filament Fabrication (FFF) 3D printing by using fractal noise to mask certain print artifacts (e.g. layer lines and stair-stepping). The use of textures is quite common in digital sculpting for aesthetic reasons. This study focuses on finding specific textures that minimize visible 3D print artifacts.

When Advocacy Becomes (In)Voluntary: A Thematic Analysis Of Disability Focused Organizations, Michelle Brazeau

All Theses

Only 19.1% of people with disabilities are currently employed (Bureau of Labor Statistics, 2022b). Stigma associated with disability often forces people with disabilities to have limited options in terms of employment. This has caused organizations like Bitty & Beaus Coffee and The Prospector Theater to make it their mission to hire people with disabilities. To better understand how these organizations are communicating about disability online a thematic analysis of the Instagram pages of Bitty & Beaus Coffee and The Prospector Theater was conducted. The findings suggest that these organizations use the image and likeness of the employees with disabilities to …

Impact Of Housing And Management On Production, Behavior, And Welfare Of Dairy Cows In Automatic Milking Systems, Lindsey Eve Davis

All Theses

The overall objective of this research was to determine the impact of Automatic Milking System (AMS) housing and management practices on cow production, behavior, and welfare of Holstein dairy cows. The first objective was to identify factors at the farm and cow level associated with lameness on AMS farms through decision tree analysis to allocate probabilities to each input. Results indicated this novel multifactorial approach of data analysis enabled us to highlight critical points that can be focused on to lessen cow-level complications or enhance farm-level housing and management practices to reduce the incidence and severity of lameness in AMS …

Venomic Characterization Of A Medically Relevant Rear-Fanged Snake, Conophis Lineatus (Dipsadidae: Xenodontinae), From Middle America, Tristan Schramer

All Theses

Most traditional research on snake venoms has focused on front-fanged snake families (Viperidae, Elapidae, and Atractaspididae). However, venom is now generally accepted as being a much more broadly possessed trait within snakes, including species traditionally considered harmless. Unfortunately, due to historical inertia and methodological challenges, the toxin repertoires of non-front-fanged snake families (e.g., Colubridae, Dipsadidae, and Natricidae) have been heavily neglected despite the knowledge of numerous species capable of inflicting medically relevant envenomations. Integrating proteomic data for validation, we perform a de novo assembly and analysis of the Duvernoy’s venom gland transcriptome of the Central American Road Guarder (Dipsadidae: Xenodontinae: …

Effects Of Polymer Side-Group Size On Interfacial Mechanics Of Graphene-Polymer Nanocomposites, Grace Brokaw

All Theses

Graphene-reinforced polymer nanocomposites possess excellent mechanical, thermal, and electrical properties, which make them promising candidates for various applications. Favorable interfacial interactions and mechanics between graphene sheets and polymer matrices are often essential to achieve superior mechanical properties. Nevertheless, it remains largely elusive how molecular features of polymer systems, particularly the side-group size of polymer chains, affect the interfacial mechanics between graphene sheets and polymer matrices, primarily due to challenges in well controlling these features in experiments. On the other hand, exploring their roles in the mechanical properties of graphene-polymer nanocomposites is very expensive to study with all-atomistic molecular dynamics (MD) …

In Vitro Rooting Techniques In Prunus Spp. For Propagation And Disease Screening For Armillaria Root Rot (Arr) Resistance, John Lawson

All Theses

Prunus is a genus widely cultivated to produce edible fruit including almond (P. amygdalus), peach (P. persica (L.) Batsch), cherries (P. avium and P. cerasus), among others. The cultivation of Prunus is economically important for several regions of the United States and relies on appropriate cultivars and rootstocks that are adapted to a growing region. Encroaching plant pathogens are forcing breeders to use sexually compatible germplasm from related species for introgression of novel alleles that confer tolerance or resistance. This is especially true in the rootstock breeding where interspecific hybridization is often used …

Addressing Meloidogyne Enterolobii Spread In The Sweetpotato Industry: Development Of A High Throughput Survey Detection Method For Root-Knot Nematodes And Quantification Of M. Enterolobii Damage On Storage Roots In Long-Term Assays, Julianna Culbreath

All Theses

Meloidogyne enterolobii is an aggressive root-knot nematode (RKN) species that has emerged as a significant pathogen of sweetpotato in the Southeastern US. Meloidogyne enterolobii is spread through the movement of infected ‘seed’ sweetpotatoes used for propagation, and the RKN resistance in commercial sweetpotato cultivars has proven ineffective against this nematode. This has prompted regulatory agencies to impose quarantines on regions infected with M. enterolobii. Sweetpotato storage roots can be rendered unmarketable due to M. enterolobii infection, resulting in potential overall yield loss. Visual detection of RKN in sweetpotato can be unreliable, and further distinguishing M. enterolobii from other RKN species …

Cover Cropping And Organic Amendments To Improve Sandy Soils Under Organic Vegetable Production, Charles Williamson

All Theses

Coastal Plain soils in the Southeastern USA are typically sandy with poor soil structure, low soil organic carbon (SOC) content, and meager soil fertility that pose challenges to organic agriculture. Adding organic inputs is a strategy to improve these soils' physical, chemical, and biological characteristics. Here, we aim to investigate the impacts of Cover Cropping (CC) and manure inclusions on sandy soils under organic vegetable production. The experiment design was a randomized complete block with two treatments of manure application (with and without) and four CC treatments of cereal rye (Secale cereale), hairy vetch (Vicia villosa), …

Koopman Operator Theory And The Applied Perspective Of Modern Data-Driven Systems, Alex Krolicki

All Theses

Recent theoretical developments in dynamical systems and machine learning have allowed researchers to re-evaluate how dynamical systems are modeled and controlled. In this thesis, Koopman operator theory is used to model dynamical systems and obtain optimal control solutions for nonlinear systems using sampled system data. The Koopman operator is obtained using data generated from a real physical system or from an analytical model which describes the physical system under nominal conditions. One of the critical advantages of the Koopman operator is that the response of the nonlinear system can be obtained from an equivalent infinite dimensional linear system. This is …

Effect Of Metal Ions And Temperature On Stability Of Thiamine Determined By Hplc, Jhong Huei Huang

All Theses

Thiamine degradation occurs during storage and transportation for short and long periods due to the exposure to several factors, such as heat, oxidation-reduction reactions, and alkali. In this study, the effects of four metal ions (i.e., Cu⁺, Cu²⁺, Fe²⁺, and Fe³⁺) on thiamine stability in aqueous solutions at three temperatures (i.e., 25, 40, and 55°C) for the storage time of 7 days were discussed. Thiamine degradation was found to follow the first-order kinetic reaction, and the degradation rate could also be estimated. The factors in influencing thiamine stability included pH values, temperatures, …

Performance Based Design And Machine Learning In Structural Fire Engineering: A Case For Masonry, Deanna Craig

All Theses

The volatile and extreme nature of fire makes structural fire engineering unique in that the load actions dictating design are intense but not geographically or seasonally bound. Simply, fire can break out anywhere, at any time, and for any number of reasons. Despite the apparent need, fire design of structures still relies on expensive fire tests, complex finite element simulations, and outdated procedures with little room for innovation. This thesis will make a case for adopting the principles of performance-based design and machine learning in structural fire engineering to simplify the process and promote the consideration of fire in all …