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Graduate Theses and Dissertations

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Gaseous Ozone To Improve The Microbial Safety Of Spices, Seeds, And Nuts, Arshpreet Kaur Khattra May 2024

Gaseous Ozone To Improve The Microbial Safety Of Spices, Seeds, And Nuts, Arshpreet Kaur Khattra

Graduate Theses and Dissertations

Due to the increasing number of reported outbreaks of pathogens in low-moisture foods (LMFs), there is a need to investigate novel non-thermal gaseous technologies to increase the microbiological safety of spices, nuts, and seeds without compromising the product quality. The objective of this study was to inactivate Salmonella spp. in different spices, seeds, and nuts using gaseous ozone treatment and evaluate the suitability of Enterococcus faecium as a potential surrogate for Salmonella. Each food product (dried basil leaves, black peppercorn, chia seeds, and walnuts) was separately inoculated with a 5-strain Salmonella and E. faecium cocktail and equilibrated to water activity …

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The Effects Of Diet, Size, And Phylogeny On Primate Dental Proportions, Rudolph J. Wilkins Dec 2023

The Effects Of Diet, Size, And Phylogeny On Primate Dental Proportions, Rudolph J. Wilkins

Graduate Theses and Dissertations

It is generally appreciated that there is a relationship between the relative size of the incisors, mandible length, and diet in primates. More specifically, the differences in relative incisor size among primate species are believed to be evolutionary adaptations to their use during food processing and acquisition. While this satisfactorily explains relatively large incisors, it fails to address the relatively small incisor size seen in many taxa. One hypothesis is that there is a trade-off between molar size and incisor size in species with relatively short mandibles. The following study uses two-way ANOVA to evaluate the possibility that spatial constraint …

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Decoding Usage And Adoption Behavior Of The Low-Carbon Transportation Market: An Ai-Driven Exploration, Vuban Chowdhury Dec 2023

Decoding Usage And Adoption Behavior Of The Low-Carbon Transportation Market: An Ai-Driven Exploration, Vuban Chowdhury

Graduate Theses and Dissertations

The transportation sector stands as a significant contributor to greenhouse gas emissions in the United States, with its environmental impact steadily escalating over the past few decades. This has prompted government agencies to facilitate the adoption and usage of low-carbon transportation (LCT) options as alternatives to fossil-fuel-powered transportation. LCTs include modes of transportation that minimize the overall carbon footprint of the transportation sector by relying on energy sources that are environmentally sustainable. These sustainable transportation options have also garnered significant interest in the transportation research community. For government agencies and researchers alike, a comprehensive understanding of the adoption and usage …

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Determining The Effect Of The Presence Of Food Deserts On The Number Of Crashes In Census Tracts In Arkansas, Lizbeth Juarez-Bartolo Dec 2023

Determining The Effect Of The Presence Of Food Deserts On The Number Of Crashes In Census Tracts In Arkansas, Lizbeth Juarez-Bartolo

Graduate Theses and Dissertations

Food deserts, areas with limited access to grocery stores which sell fresh produce, dairy, and meats, are a growing concern in many communities. The presence of a food desert is known to cause great impacts on the physical health of the people residing within them, but there is little to no research on a food desert’s influence on the traffic safety of the location in which it encompasses. Based on previous studies into food deserts, studies suggest that food inaccessibility is mostly felt by rural residents. Since rural residents must travel farther distances on more hazardous rural roadways to access …

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How I Came To Jam With The Angels Of The Dirty South: A Journey Into Art And Art Education, Miki Skak Dec 2023

How I Came To Jam With The Angels Of The Dirty South: A Journey Into Art And Art Education, Miki Skak

Graduate Theses and Dissertations

This paper dives into my personal journey from a far-left activist youth into becoming an artist. It explains how a poet saw artistic potential within me, introduced me to the world of art and eventually art education. I reflect on the art education I have received from several different art schools and how they try to adapt to the demands of the contemporary art world that has been in a constant condition of reshaping itself since Marcel Duchamp’s readymade. As an artist who is less focused on the techniques of traditional artistic mediums, I investigate how the state of art …

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Self-Consolidating Concrete Design For Drilled Shaft Structural Applications, Grady S. Caton Dec 2023

Self-Consolidating Concrete Design For Drilled Shaft Structural Applications, Grady S. Caton

Graduate Theses and Dissertations

Self-consolidating concrete (SCC) is a relatively new concrete technology which allows the concrete to be placed without the need for manual or machine vibration. This innovation reduces labor costs, construction times, and can provide a smooth, finished surface. However, this technology is used in the United States primarily in the precast and prestressed concrete industry. The utility of SCC in structural applications, such as areas of dense reinforcement or locations where complex geometry makes consolidation impossible, is also advantageous. In this study, a series of SCC mixtures were developed both with and without fly ash replacement. These mixtures were then …

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Comparing In-Situ Liquefaction Triggering Procedures For Sites In Arkansas, Sagar Barua Dec 2023

Comparing In-Situ Liquefaction Triggering Procedures For Sites In Arkansas, Sagar Barua

Graduate Theses and Dissertations

There currently exists a significant amount of uncertainty when designing piles for bridge foundations in liquefiable soil. Currently ARDOT engineers use a Standard Penetration Test (SPT) based liquefaction spreadsheet developed 10 years ago to evaluate liquefaction triggering. Since this spreadsheet was developed, updates to the liquefaction triggering procedures have been published making the spreadsheet out-of-date. Moreover, additional methods of liquefaction evaluation using cone penetration test (CPT) and shear wave velocity (Vs) provide added means of evaluating liquefaction potential. This thesis updates ARDOT's liquefaction triggering evaluation methodology with the newest procedures and incorporates additional empirical liquefaction hazard estimates such as the …

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The Impact Of Eye-Movement Desensitization And Reprocessing On Self-Reported Test Anxiety In College Students, Renee Wilson Dec 2023

The Impact Of Eye-Movement Desensitization And Reprocessing On Self-Reported Test Anxiety In College Students, Renee Wilson

Graduate Theses and Dissertations

Test Anxiety (TA) has become a major concern for college students. Experiencing mental concern about test-taking perpetuated by physiological hyperarousal directly affects students’ ability to be successful in college. Eye Movement Desensitization and Reprocessing (EMDR) is a multi-faceted therapeutic approach that aims to process dysfunctional negative cognitions which originate with negative past experiences to an adaptive state. Developed by Francine Shapiro in 1989, the Adaptive Information Processing (AIP) model undergirds the 30-second, therapist-initiated, bi-lateral eye-movements. These movements identify and reprocess emotionally disturbing experiences, linked to an individual’s emotional expression, by deliberatively triggering a connected trauma network. This dissertation examined the …

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Development Of A Prototype Satellite-Tracking Telescope For Ground-Based Spectroscopy, Charles Smith Dec 2023

Development Of A Prototype Satellite-Tracking Telescope For Ground-Based Spectroscopy, Charles Smith

Graduate Theses and Dissertations

Spectroscopy is the practice of determining the chemical composition of a gas through analyzing the light that is filtered by the gas. Spectroscopy is commonly used by astronomers to deduce the atmospheric composition of planets. This process is done by initially measuring the spectrum of light from the star that the planet orbits, and then measuring it again once the planet is in between the observer and the star. The spectrum light that is filtered out is dependent on the chemical composition of the gas, and so this information can be used to determine the chemical composition of the atmosphere …

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Standing On The Edge Of A Dream, Parto Ahmadpour Mobarake Dec 2023

Standing On The Edge Of A Dream, Parto Ahmadpour Mobarake

Graduate Theses and Dissertations

Standing On the Edge of a Dream delves into the intricate tapestry of lived experiences shaped by relocation, emphasizing the nuanced space that exists between reality and imagination. As an individual who has undergone the transformative journey of immigration, I recognize that the concept of relocation is like standing on the edge of a dream. This notion becomes a living structure, intricately woven with threads from our past, present, and future. My artistic exploration extends beyond my artworks, yet it remains deeply rooted in my personal narratives. The artworks in the exhibition continue to draw inspiration from personal memories and …

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Increasing Accessibility For Hard-To-Reach Cultural Heritage Sites Using Low-Cost Drone Photogrammetry, Eray Can Dec 2023

Increasing Accessibility For Hard-To-Reach Cultural Heritage Sites Using Low-Cost Drone Photogrammetry, Eray Can

Graduate Theses and Dissertations

New recording technologies have ushered in a transformative era in archaeological research, with drone photogrammetry emerging as a pioneering tool in this field. This innovative approach leverages unmanned aerial vehicles (UAVs) equipped with high-resolution cameras to capture precise aerial imagery of archaeological sites. Drone photogrammetry offers numerous advantages, such as cost-efficiency, rapid data collection, and the ability to access remote or challenging terrain. By seamlessly integrating photogrammetric techniques, these technologies offer archaeologists the ability to create highly detailed 3D models. This study delves into the principles and applications of low-cost drone photogrammetry in archaeology, highlighting its potential to enhance site …

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Oscillith Matara, James Reilly Dickens-Hoffman Dec 2023

Oscillith Matara, James Reilly Dickens-Hoffman

Graduate Theses and Dissertations

Oscillith Matara is a series of improvisational acousmatic compositions that explore themes of birth, death, trauma and transformation. Each composition is an entry from a log of my daily practice. This practice is a meditation using electronic instruments as feedback devices to explore my states of consciousness as it relates to my present situation and personal history. The sound generated through this process of reflecting and responding acts as a cathartic medium for processing depression, anxiety and chronic pain. As a thesis exhibition Oscillith Matara is presented as a group of selected works and is performed as a fixed duration …

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Where Will I Be From, Melissa Loney Dec 2023

Where Will I Be From, Melissa Loney

Graduate Theses and Dissertations

Where Will I Be From is an exhibition and film centered around the intersections of generational grief and technology. I documented domestic locations connected to my family across the Great Plains. This on-site photo documentation was then used to create photogrammetric renderings of these locations and their structures, recorded in the open-source CAD software Blender. Together, these familial places, separated by hundreds of miles, were digitally compiled to make one collective world. The aesthetic of this project connects the visual languages of Southern Gothic and Low-Poly Video games. The Gothic nature exposes an isolated decaying presence within a rural landscape. …

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Deep Learning For Photovoltaic Characterization, Adrian Manuel De Luis Garcia Dec 2023

Deep Learning For Photovoltaic Characterization, Adrian Manuel De Luis Garcia

Graduate Theses and Dissertations

This thesis introduces a novel approach to Photovoltaic (PV) installation segmentation by proposing a new architecture to understand and identify PV modules from overhead imagery. Pivotal to this concept is the creation of a new Transformer-based network, S3Former, which focuses on small object characterization and modelling intra- and inter- object differentiation inside an image. Accurate mapping of PV installations is pivotal for understanding their adoption and guiding energy policy decisions. Drawing insights from current Deep Learning methodologies for image segmentation and building upon State-of-the-Art (SOTA) techniques in solar cell mapping, this work puts forth S3Former with the following enhancements: 1. …

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Where One Puts Wood On The Fire: The Political Economy Of P’Urépecha Urban Neighborhoods At The Site Of Angamuco, Michoacán, Kyle Ryan Urquhart Dec 2023

Where One Puts Wood On The Fire: The Political Economy Of P’Urépecha Urban Neighborhoods At The Site Of Angamuco, Michoacán, Kyle Ryan Urquhart

Graduate Theses and Dissertations

This dissertation seeks to understand the political and economic relationships in the organization and use of neighborhood public space at the archaeological site of Angamuco in Michoacán, Mexico. Ethnohistoric sources describe multiple distinct social classes for the P’urépecha people at the time of European contact, but they are ambiguous about the exact political and economic relationships among them. There is some description of how these different interest groups articulated at the level of the city-state, but there is not much information on the internal dynamics of neighborhood or district-level subdivisions of the city-state. The discovery of the remains of a …

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Capabilities Of Sintered Silver As A High Temperature Packaging Material, Bakhtiyar Mohammad Nafis Dec 2023

Capabilities Of Sintered Silver As A High Temperature Packaging Material, Bakhtiyar Mohammad Nafis

Graduate Theses and Dissertations

With electrification progressing across many sectors including industry, automotive and aerospace, the power density requirements are changing. The increased power density results in higher and higher ambient temperatures that electronics are exposed to. The response has been to move towards wide bandgap (WBG) semiconductor devices that can withstand much greater temperatures and can operate at much higher voltages than silicon. Additionally, these WBG devices deliver low drain-source on resistance (RDS_on) capabilities, enabling high current power modules that increase power density even further. This also requires the packaging to evolve in order to withstand the new requirements. As a result, researchers …

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Reliability Modeling And Improvement Of Critical Infrastructures: Theory, Simulation, And Computational Methods, José Carlos Hernández Azucena Dec 2023

Reliability Modeling And Improvement Of Critical Infrastructures: Theory, Simulation, And Computational Methods, José Carlos Hernández Azucena

Graduate Theses and Dissertations

This dissertation presents a framework for developing data-driven tools to model and improve the performance of Interconnected Critical Infrastructures (ICIs) in multiple contexts. The importance of ICIs for daily human activities and the large volumes of data in continuous generation in modern industries grant relevance to research efforts in this direction. Chapter 2 focuses on the impact of disruptions in Multimodal Transportation Networks, which I explored from an application perspective. The outlined research directions propose exploring the combination of simulation for decision-making with data-driven optimization paradigms to create tools that may provide stakeholders with optimal policies for a wide array …

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Characterization Of Highly Doped N-Type And P-Type Silicon Carbide Ohmic Contacts, Tanner Rice Dec 2023

Characterization Of Highly Doped N-Type And P-Type Silicon Carbide Ohmic Contacts, Tanner Rice

Graduate Theses and Dissertations

Silicon Carbide (SiC) is a rather new material that possesses unparalleled properties when compared to Silicon. Due to its larger band gap alongside other thermal properties, SiC can survive in hotter, more radiation intensive environments, whether that be within the crust of the earth or in the reaches of space. As a desirable semiconductor for these applications, CMOS is an especially important device due to its low power consumption. However, creating a good contact between the metal and semiconductor optimally requires two different metals for the n -type and the p-type semiconductor. This greatly increases the processing time, as separate …

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Scaffolding Strategies That Benefit And Support Adult English As A Foreign Language Reading Comprehension: A Literature Review, Walkiris Mejia Ortega Dec 2023

Scaffolding Strategies That Benefit And Support Adult English As A Foreign Language Reading Comprehension: A Literature Review, Walkiris Mejia Ortega

Graduate Theses and Dissertations

The poor reading proficiency and the lack of reading comprehension strategies have been a major flaw for adult university learners in English as a Foreign Language (EFL) contexts, particularly in the case of English majors at the School of Foreign Languages in the Autonomous University of Santo Domingo, Dominican Republic. Research has shown this reading gap can be improved through suitable instructional strategies and assistance referred to as scaffolding. The purpose of this literature review was to investigate how beneficial scaffolding is for EFL adults´ reading comprehension, which scaffolding strategies prove effective in supporting EFL reading comprehension, and how those …

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Effect Of Cultural Strategies And Application Technologies On Weed Control In Flooded And Furrow-Irrigated Rice, Noah Hunter Reed Dec 2023

Effect Of Cultural Strategies And Application Technologies On Weed Control In Flooded And Furrow-Irrigated Rice, Noah Hunter Reed

Graduate Theses and Dissertations

Weed control is a major problem that rice (Oryza sativa L.) producers face in the Mid-south every growing season. Restricted use of some rice herbicides has also highlighted the need for more research to be conducted on cultural weed control strategies and application technologies in rice. The aim of these studies was to evaluate rice weed control using various rice row widths, bed widths (irrigation-furrow spacing), rice cultivar selection, and nozzle type selection. Three field experiments were conducted in 2021 and 2022 across four sites at Lonoke, AR, Pine Tree, AR, Rohwer, AR, and Stoneville, MS. In experiment one, as …

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The Use Of Culturally Relevant Pedagogy In Esol Classes, Beth A. O. Haddinger Dec 2023

The Use Of Culturally Relevant Pedagogy In Esol Classes, Beth A. O. Haddinger

Graduate Theses and Dissertations

This dissertation is organized into five distinct chapters addressing multiple aspects of learning and engagement as it relates to English Language Learners (ELLs) in the classroom. First, the problem of practice is identified and explored. We, as educators, must look closely at instructional and systemic issues, actionable elements, broader strategies of improvement, and leverage, which refers to the ability of a program to motivate students and to generate a sense of practical value in academics. The next aspect of this dissertation proposal reviews the existing research literature. This literature review focuses on the specific learning needs of ELL students. Specifically …

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Characterization Of Human Fibroblast Growth Factor 2 Variant To Determine Effects On Structure, Stability, And Cell Proliferation, Ryan Layes Dec 2023

Characterization Of Human Fibroblast Growth Factor 2 Variant To Determine Effects On Structure, Stability, And Cell Proliferation, Ryan Layes

Graduate Theses and Dissertations

Fibroblast growth factors (FGFs) are a family of cell signaling proteins conserved across multiple species. Each individual FGF elicits different cellular functions including, but not limited to, proliferation, migration, differentiation, angiogenesis, and wound healing. One of the most studied members, fibroblast growth factor 2 (FGF2), has demonstrated substantial wound healing capacity in a wide range of tissues including skeletal, muscular, neural, respiratory, epithelial, and cardiovascular. This ability makes FGF2 a potential therapeutic for a wide range of conditions and injuries. However, due to a short half-life at room temperature, therapeutic use of FGF2 is limited. It has been demonstrated that …

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The Spatial And Temporal Distribution Of Large Rock Blocks And Control On Landscape Evolution In The Ozarks, Chelsea Moran Dec 2023

The Spatial And Temporal Distribution Of Large Rock Blocks And Control On Landscape Evolution In The Ozarks, Chelsea Moran

Graduate Theses and Dissertations

Geologists often use landscape form to infer landscape processes through time. While climate and tectonics shape geomorphic form, the potential range of spatial or temporal scales that can shape any specific landscape can render landscape process-form based hypotheses too general for consideration. Contributions by mathematical modeling have helped bridge the gap between inferring processes from form, notably in how sediment transport dynamics shape hillslopes. However, few models encapsulate the movement of large rock blocks ( >2 meters across) and their potential impact as hillslope sediment transport disruptors. The Upper Buffalo River watershed (BRW) in the Ozarks of northern Arkansas has …

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Towards Long-Term Fairness In Sequential Decision Making, Yaowei Hu Dec 2023

Towards Long-Term Fairness In Sequential Decision Making, Yaowei Hu

Graduate Theses and Dissertations

With the development of artificial intelligence, automated decision-making systems are increasingly integrated into various applications, such as hiring, loans, education, recommendation systems, and more. These machine learning algorithms are expected to facilitate faster, more accurate, and impartial decision-making compared to human judgments. Nevertheless, these expectations are not always met in practice due to biased training data, leading to discriminatory outcomes. In contemporary society, countering discrimination has become a consensus among people, leading the EU and the US to enact laws and regulations that prohibit discrimination based on factors such as gender, age, race, and religion. Consequently, addressing algorithmic discrimination has …

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From The Arab World To The United States Of America: The Wellness Of Arab Graduate Women Studying In The U.S., Mariam Mostafa Dec 2023

From The Arab World To The United States Of America: The Wellness Of Arab Graduate Women Studying In The U.S., Mariam Mostafa

Graduate Theses and Dissertations

The pursuit of higher education symbolizes a profound and transformative journey, particularly for international students who embark on the path of studying abroad. This dissertation undertakes an in-depth exploration of the well-being of Arab women pursuing their graduate studies in the United States (US), emphasizing four crucial dimensions of wellness: social, mental/emotional, physical, and financial well-being. Employing a qualitative research methodology, this study delves into the multifaceted experiences of this specific student population and investigates how these experiences impact them. Through a series of interviews and rigorous qualitative analysis, we illuminate the distinct challenges and opportunities that Arab graduate students …

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Bayesian Learning Of Spatiotemporal Source Distribution For Beached Microplastic In The Gulf Of Mexico, David Pojunas Dec 2023

Bayesian Learning Of Spatiotemporal Source Distribution For Beached Microplastic In The Gulf Of Mexico, David Pojunas

Graduate Theses and Dissertations

Over the last several decades, plastic waste has gradually accumulated while slowly degrading in terrestrial and oceanic environments. Recently, there has been an increased effort to identify the possible sources of plastic to understand how they affect vulnerable beaches. This issue is of particular concern in the Gulf of Mexico due to the presence of oil, natural gas, and plastic production. In this thesis, we expand upon existing Bayesian plastic attribution models and develop a rigorous statistical framework to map observed beached microplastics to their sources. Within this framework, we combine Lagrangian backtracking simulations of floating particles using nurdle beaching …

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Trojan Detection Expansion Of Structural Checking, Zachary Chapman Dec 2023

Trojan Detection Expansion Of Structural Checking, Zachary Chapman

Graduate Theses and Dissertations

With the growth of the integrated circuit (IC) market, there has also been a rise in demand for third-party soft intellectual properties (IPs). However, the growing use of such Ips makes it easier for adversaries to hide malicious code, like hardware Trojans, into these designs. Unlike software Trojan detection, hardware Trojan detection is still an active research area. One proposed approach to this problem is the Structural Checking tool, which can detect hardware Trojans using two methodologies. The first method is a matching process, which takes an unknown design and attempts to determine if it might contain a Trojan by …

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Human-Bat Interactions In A Disease Emergence Hotspot: Implications For Human Health And Bat Conservation, Reilly Tempest Jackson Dec 2023

Human-Bat Interactions In A Disease Emergence Hotspot: Implications For Human Health And Bat Conservation, Reilly Tempest Jackson

Graduate Theses and Dissertations

Bats are an ecologically important taxon that can host zoonotic pathogens. Globally, many bat species are synanthropic and live closely with humans, often roosting in man-made structures. The spatial overlap between humans and bats creates opportunities for human-bat contact, which can lead to human exposure to bat-borne pathogens and conflicts that cause bat mortality. Despite this risk, little is known about the drivers and characteristics of these human-bat interactions in buildings and work is needed to understand this aspect of the wildlife-urban interface. In Chapter I, I present a literature review that identifies the geographic and taxonomic trends in reported …

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Age, Size, And Composition Of Selected Old-Growth Shortleaf Pine Stands In The Upper Buffalo River, Arkansas, Willa Avery Thomason Dec 2023

Age, Size, And Composition Of Selected Old-Growth Shortleaf Pine Stands In The Upper Buffalo River, Arkansas, Willa Avery Thomason

Graduate Theses and Dissertations

Shortleaf pine (Pinus echinata) approaches the westernmost limits of its range in the Arkansas Ozarks. Despite heavy logging of shortleaf pine throughout its range during the 19th and 20th centuries, the species was not easily accessible for harvest and transportation in the most rugged areas of the Boston Mountains and, as a result, there are a few extant stands of old-growth shortleaf pine in the region. The shortleaf pine stands in the interior Boston Mountains are unusual in that they exist primarily above bluff lines at topographic breaks in the hardwood canopy and are not disturbed by fire as frequently …

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A Study Of Latino Undergraduate Students In Retention Cohorts At The University Of Arkansas, Ramon Balderas Dec 2023

A Study Of Latino Undergraduate Students In Retention Cohorts At The University Of Arkansas, Ramon Balderas

Graduate Theses and Dissertations

Higher education institutions do not have a history of being racially inclusive, and as a result, research and best practices around retention and student success have not been developed for underrepresented and minoritized students. Although there has been a surge in scholarship on diversifying higher education, literature, and identifying best practices focused on retaining students there is less research and literature that looks at Latino students. The study's purpose was to better understand Latino undergraduate student retention patterns at the University of Arkansas, a midwestern public four-year research university. The significance of the study was to assist UA administrators and …

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