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Characterizing The Role Of Chemo-Mechanical Couplings In The Activation Process Of Proteins That Undergo Conformational Changes, Ugochi Isu
Graduate Theses and Dissertations
Proteins are not static entities; rather, they are dynamic macromolecules that undergo conformational changes to perform their biological functions. These structural transitions are often coupled to chemical events such as lipid interactions, or changes in the cellular environment. Understanding the intricate interplay between chemical perturbations and the resulting mechanical response is crucial for elucidating the activation mechanisms of proteins. This dissertation aims to characterize the role of chemo-mechanical couplings in the activation process of two G protein-coupled receptors (GPCRs): Cannabinoid Receptor 1 (CB1) and Metabotropic Glutamate Receptor 1 (mGluR1). We employ molecular dynamics simulations to investigate the conformational landscapes of …
Understanding Video Modeling Adoption: Perspectives Of Special Education Teachers, Support Specialists And Transition Consultants, Hayot Tuychiev
Understanding Video Modeling Adoption: Perspectives Of Special Education Teachers, Support Specialists And Transition Consultants, Hayot Tuychiev
Graduate Theses and Dissertations
This qualitative study investigates the knowledge, perceptions, and adoption factors of special education teachers and support specialists regarding video modeling (VM) as a vocational intervention for high school students with autism spectrum disorder (ASD). Grounded in Rogers' theory of innovation diffusion, the research explores their understanding of VM, its perceived effectiveness, and the factors influencing its adoption or rejection.This qualitative study investigates special education teachers' knowledge, perceptions, and adoption factors related to Video Modeling (VM) as a vocational intervention for high school students with autism spectrum disorder (ASD). Grounded in Rogers' theory of innovation diffusion, the research explores teachers' understanding …
Towards Side-Channel Infrastructure For Software Implementations Of Pqc Algorithms, Tristen Teague
Towards Side-Channel Infrastructure For Software Implementations Of Pqc Algorithms, Tristen Teague
Graduate Theses and Dissertations
Post-Quantum Cryptography (PQC) is a new class of asymmetric cryptography algorithms that are supposed to be secure against both classical computers and quantum computers through Shor’s algorithm. Since PQC algorithms are currently being standardized, they will replace older standardized asymmetric algorithms (such as RSA) and will be deployed within the digital infrastructure. Before implementations of the PQC algorithms are placed into the infrastructure, they must undergo evaluation of both performance and security. One such security issue that needs large investigation before deployment are side-channels. Side-channel attacks (SCA) are a method of gathering information from the implementation, such as power-consumption and …
Design And Implementation Of High-Frequency Dc-Dc Converters For Ev Applications, Rahul Biswash
Design And Implementation Of High-Frequency Dc-Dc Converters For Ev Applications, Rahul Biswash
Graduate Theses and Dissertations
The power electronics industry has been revolutionized by introducing wide bandgap semiconductor devices, such as Silicon Carbide (SiC) and Gallium Nitride (GaN). Due to their high frequency, high temperature, and high voltage operating capabilities, wide bandgap devices boast significant improvements in power density, efficiency, and reliability, as evidenced by their ability to decrease the size of power converters by operating at higher frequencies, temperatures and voltages, use of smaller and less passive components, such as transformers, inductors and capacitors, which makes power converters more compact and light-weight, ideal for space and weight-constrained applications, and compatibility with a wide range of …
Evaluation Of The Effect Of A Commercial Lippia Origanoides Essential Oil Extract On Salmonella Serovar Enteritidis As A Natural Alternative To Antibiotics In The Poultry Industry, Abdiel Atencio
Graduate Theses and Dissertations
The purpose of the present research was to evaluate the bactericidal activity of a microencapsulated Lippia origanoides essential oils (LOEOs) against Salmonella Enteritidis (SE) in an in vitro crop assay and in a prophylactic broiler chicken model using three low doses of the product: 75 ppm, 150 ppm and 300 ppm. Two trials of each assay were conducted. Day-of-hatch male Cobb-Vantress broiler chickens were randomly allotted to one of four groups: 1) positive control group; 2) 75 ppm LOEOs group; 3) 150 ppm LOEOs group; 4) 300 LOEOs group. Chicks were fed and watered ad libitum in heated brooder batteries …
Exploring The Intersection Of Masculinity, Mental Health, And Mass Shootings, Kaitlyn Campbell
Exploring The Intersection Of Masculinity, Mental Health, And Mass Shootings, Kaitlyn Campbell
Graduate Theses and Dissertations
Few studies have explored how intersecting challenges to masculinity and mental health can precipitate mass shootings. This study examines how responses to strained masculinity and mental health disorders combine across varying situational and social contexts to explain why and how offenders commit mass shootings. Data come from the U.S. Extremist Crime Database, Bias Homicide Database, and other open-source data on mass shootings. Drawing from Allison and Klein’s (2021) concept of “strained masculinity”, this study utilizes a qualitative narrative approach to uncover themes of strained masculinity and mental health issues among perpetrators of mass shootings. Different storylines emerge capturing ways some …
Hierarchical Power Converter Physical Design, Tristan Mark Evans
Hierarchical Power Converter Physical Design, Tristan Mark Evans
Graduate Theses and Dissertations
The field of power electronics is undergoing rapid advancement that is driven by the need for further electrification in all aspects of power generation and transmission, transportation, and consumer goods. Recent advances in wide bandgap (WBG) semiconductor technologies continue to push their adoption in systems with higher power densities and conversion efficiencies. However, the way in which the components of these systems are designed has not kept pace with the rapidly evolving landscape of their applications and often requires costly, manual design iteration. Therefore, new methods are needed to improve this design process. Packaging of power devices is a critical …
Fabrication And Characterization Of Black Phosphorus Terahertz Photoconductive Antennae, Katie Michelle Welch
Fabrication And Characterization Of Black Phosphorus Terahertz Photoconductive Antennae, Katie Michelle Welch
Graduate Theses and Dissertations
Advancements in terahertz (THz) imaging systems, particularly for applications like post-surgical analysis of breast cancer, have led to the exploration of novel materials such as black phosphorus as the active material for a THz photoconductive antenna (PCA). This thesis, motivated by innovative techniques developed at the University of Arkansas, investigates the potential of black phosphorus as a material to enhance the performance of THz PCAs, focusing on generation efficiency and bandwidth. Previous implementations of BP as THz emitters have shown limitations, highlighting the need for thorough material characterization and optimized fabrication processes. Therefore, we adopted a dual-phase approach to this …
Exploring Diversity, Discrimination, And Performance Dynamics, George Agyeah
Exploring Diversity, Discrimination, And Performance Dynamics, George Agyeah
Graduate Theses and Dissertations
This dissertation utilizes empirical and experimental approaches to investigate the multifaceted factors that affect decision-making in economic contexts. The three chapters place a particular focus on group affiliation, perceived discrimination, and the gender gap in entrepreneurship. The first chapter explores the impact of team diversity on economic decision-making within a dynamic context. Through a series of laboratory experiments involving participants randomly assigned to teams, the study examines how team diversity influences individual behavior and performance. Results indicate that team diversity significantly affects individual behavior, with newcomers being particularly influenced by the diversity of the team they join. The findings underscore …
Career Skills Congruence: Transferring Military Talent To The Civilian Job Market: A Preregistered Study, Anna M. Amos
Career Skills Congruence: Transferring Military Talent To The Civilian Job Market: A Preregistered Study, Anna M. Amos
Graduate Theses and Dissertations
The training and experience gained through U.S. military service instill a strong sense of discipline, loyalty, and duty to one's country while preparing service members for the challenges they face during their military careers. Military culture is a defining aspect of servicemembers' identities, especially for those who have spent significant time in the military. The problem is that service members often enculturate into a life where they adopt an identity incongruent with the ability to engage in a smooth transition to civilian culture. The purpose of this cross-sectional regression study is to test social identity theory and transition theory that …
Exploring The Potential Of Electromagnetic-Driven Energy Technologies In Preventing Microbial And Aflatoxin Contamination Of Grains, Abass A. Oduola
Exploring The Potential Of Electromagnetic-Driven Energy Technologies In Preventing Microbial And Aflatoxin Contamination Of Grains, Abass A. Oduola
Graduate Theses and Dissertations
Electromagnetic-driven energy such as infrared (IR) technology holds great potential in deactivating Aspergillus flavus spores and prevents aflatoxin B1 (AFB1) contamination. Aflatoxins, highly toxic secondary metabolites primarily produced by Aspergillus species within the Flavi section (A. flavus, A. parasiticus, and A. nomius), pose substantial health risks to both humans and animals due to their significant toxicity and carcinogenic properties. Detecting and quantifying the presence and proliferation of these harmful fungi on food materials can be achieved by measuring the concentration of ergosterol. Ergosterol is a sterol compound produced in the cell membranes of fungi during their growth, providing …
Genomic Characterization Of Enterococcus Spp Infecting Chicken Embryo, Aishat Olaoluwa Lawal
Genomic Characterization Of Enterococcus Spp Infecting Chicken Embryo, Aishat Olaoluwa Lawal
Graduate Theses and Dissertations
Chicken embryo mortality has been attributed to bacterial infections and can lead to a decline in hatchability, posing potential losses in the broiler industry. This study aims to investigate the vertical transmission of specific bacterial pathogens from breeder hens to subsequent broiler flocks through MGEs and their association with host specificity. In our sampling of 360 eggs from a broiler flock, we isolated various Enterococcus species, including E. gallinarum and E. faecalis, from incubated egg yolks or aborted embryos. E. avium was found in unincubated bad yolks. Other species like Streptococcus, Lactobacillus, and Bacillus were observed but presumed to be …
Working Alongside People With Disabilities: Their Impact And Value, Alice A. Jensen
Working Alongside People With Disabilities: Their Impact And Value, Alice A. Jensen
Graduate Theses and Dissertations
U.S. policies such as the Workforce Innovation and Opportunity Act of 2014 and the Americans with Disabilities Act support the inclusion of adults with disabilities in all areas of employment. Through WIOA, the federal government required public entities to provide training and help job seekers with disabilities access high-quality, competitive, integrated employment in the labor market. Nevertheless, two-thirds of unemployed PWDs report wanting employment but cannot find a job. Negative perceptions held by employers and hiring managers and their views that PWDs lack abilities create barriers to employment. In contrast, research has also shown that coworkers can greatly influence successful …
Decolonizing Neo-Liberalism, Empowering The Local: A Global South Reading Of Noir In The 2000s., Jean-Hugues Bita’A Menye
Decolonizing Neo-Liberalism, Empowering The Local: A Global South Reading Of Noir In The 2000s., Jean-Hugues Bita’A Menye
Graduate Theses and Dissertations
This research aims at providing a Global South reading of noir in the late 1990s and early 2000s. It relies on the premise that noir, a sub-genre of crime fiction born in France during World War II, offered new avenues of literary creation and political criticism. Based on a selection of authors from the U.S., Mexico, Algeria, and Cameroon, the dissertation explores how authors from underrepresented or formerly-colonized communities discuss the impact of neoliberal thinking in their communities. With an emphasis on race and gender dynamics, nation building and terrorism, police corruption and brutality, or the growth of organized, each …
Developing Anisotropic Soft Matter As Functional Materials To Interface With Biological Systems, Homa Ghaiedi
Developing Anisotropic Soft Matter As Functional Materials To Interface With Biological Systems, Homa Ghaiedi
Graduate Theses and Dissertations
Liquid crystals (LCs) constitute a subset of soft matter possessing hybrid characteristics from both liquid and crystalline phases. In this state, the center of masses remains uncorrelated similar to an isotropic phase, while the long axis of molecules aligns in parallel, resulting in molecules exhibiting orientational and positional order, either individually or concurrently. The directional alignment inherent in LCs arises from the asymmetrical shape and structure of the constituent molecules, causing a spontaneous self-assembly into ordered phases. This cooperative molecular behavior manifests distinctive optical features when subjected to cross polarizers. The remarkable sensitivity of LCs to external stimuli, including temperature, …
Yeast Surface Display Of Multiple Heterologous Proteins Via Molecular And Biochemical Processing Techniques, Shadrach Ibinola
Yeast Surface Display Of Multiple Heterologous Proteins Via Molecular And Biochemical Processing Techniques, Shadrach Ibinola
Graduate Theses and Dissertations
The arming of yeast cell wall, also known as yeast surface display, is an effective technology for expressing target proteins extracellularly. It has been shown to provide bioengineered yeast with qualities that are not known to native yeast such as the ability to survive harsh conditions including high pH and temperature, for example. Furthermore, this technique has been implemented for various applications which include, protein engineering, bioethanol production, bioremediation, vaccine construction, and antibody development. The major mechanisms of yeast surface display exploit agglutination, flocculation, or proteins with internal repeats as the means by which a target (protein) is covalently attached …
In-Service Needs Of Selected Arkansas Agriculture Teachers Related To Precision Agriculture Systems, Henry Ofosu Akwah
In-Service Needs Of Selected Arkansas Agriculture Teachers Related To Precision Agriculture Systems, Henry Ofosu Akwah
Graduate Theses and Dissertations
Precision Agriculture (PA) entails the use of computer technology, including software and hardware, together with good agronomic practices to effectively utilize resources available to growers. PA may enhance profitability, sustainability, resilience, and efficiency when implemented successfully. The aim of this study was to identify, assess, and describe the PA in-service needs of selected high school agriculture teachers in Arkansas. Forty-four teachers participated in the study, recruited through convenience sampling during the annual Arkansas agriculture in-service workshop held at Camp Couchdale in July 2023. A survey instrument was developed, and all forty-four participants provided complete responses. The survey included twenty-nine PA …
Capabilities Of Sintered Silver As A High Temperature Packaging Material, Bakhtiyar Mohammad Nafis
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 …
Decoding Usage And Adoption Behavior Of The Low-Carbon Transportation Market: An Ai-Driven Exploration, Vuban Chowdhury
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 …
Oscillith Matara, James Reilly Dickens-Hoffman
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 …
Satellite-Based Estimation Of Seasonal Surface Water Change And Its Relationship To Climate Variability In A Tropical Open Basin Lake, Osnar Mondragon Grios
Satellite-Based Estimation Of Seasonal Surface Water Change And Its Relationship To Climate Variability In A Tropical Open Basin Lake, Osnar Mondragon Grios
Graduate Theses and Dissertations
This study explores the spatiotemporal dynamics of climate variability and water surface area in Lake Nicaragua, one of the largest tropical lakes on Earth. The significance of this study lies in its potential to provide valuable insights into the hydroclimatic patterns and water availability, vital for Nicaragua’s water supply. Monthly and seasonal time series of precipitation, land surface temperature, and evapotranspiration (ET), acquired from the Climate Hazards Group InfraRed Precipitation with Station data (CHIRPS) and Moderate Resolution Imaging Spectroradiometer (MODIS), were analyzed in Google Earth Engine using a non-parametric Mann-Kendall trend test and Sen's slope. The second aim of this …
Examining The Impact Of The Covid-19 Pandemic On Older Adults' Activity Participation And Mode Usage In A Rural State: A Case Study Of Arkansas, Arna Nishita Nithila
Examining The Impact Of The Covid-19 Pandemic On Older Adults' Activity Participation And Mode Usage In A Rural State: A Case Study Of Arkansas, Arna Nishita Nithila
Graduate Theses and Dissertations
The objective of the study was to investigate the impact of the COVID-19 pandemic on the activity participation and mode usage of older adults residing in Arkansas, a predominantly rural state. Leveraging primary data collected from 1,017 older adult participants, the study employed Latent Class Analysis (LCA) to capture older adults’ heterogeneity in travel behavior and found three distinct classes: Frequent Traveler, Moderate Traveler, and Non-Traveler, based on their activity participation, mode usage during the pandemic and the pandemic’s impact on their trips. Subsequently, a Multinomial Logit Model (MNL) was employed to examine how socio-demographic attributes, residential locations, and health …
Assessing The Evaporation Method For Soil-Water Retention Curve Development And Comparison Of Soil-Water Characteristics Across Different Tillage Practices In A Furrow-Irrigated Corn (Zea Mays L.) System, Jeferson Prass Pimentel
Assessing The Evaporation Method For Soil-Water Retention Curve Development And Comparison Of Soil-Water Characteristics Across Different Tillage Practices In A Furrow-Irrigated Corn (Zea Mays L.) System, Jeferson Prass Pimentel
Graduate Theses and Dissertations
The thesis comprises three studies. The first study in this thesis (Chapter I) focused on a six-year corn field experiment to assess the influence of conservation agricultural practices on soil properties and their long-term effects on water-use efficiency and yield. Non-tillage management did not significantly reduce soil bulk density compared to conventional tillage, as no differences were observed between non-tillage and tillage systems throughout the 6-year experiment. There was no difference in total water-use efficiency among soil management practices in 2018, 2019, 2020, and 2021. Even though in one year of the study, a significant 24 kg ha-1 mm-1 improvement …
Environmental And Agronomic Evaluation Of Struvite In Rice Production Systems, Diego Della Lunga
Environmental And Agronomic Evaluation Of Struvite In Rice Production Systems, Diego Della Lunga
Graduate Theses and Dissertations
Furrow-irrigation constitutes an alternative water regime that has been increasingly adopted in Arkansas. Among the management of nutrients in furrow-irrigated systems, phosphorus (P) represents a substantial challenge. The environmental sustainability of rice (Oryza sativa) production systems needs to be evaluated across different water regimes and fertilizer-P sources. Therefore, the objectives of the following studies were to: i) evaluate season-long carbon dioxide (CO2) and methane (CH4) emissions and global warming potential (GWP) under different tillage treatments [i.e., conventional tillage (CT) and no-tillage (NT)] and at different site positions (i.e., up-, mid-, down-slope) along the predominant slope of a production-scale, furrow-irrigated rice …
Determining The Effect Of The Presence Of Food Deserts On The Number Of Crashes In Census Tracts In Arkansas, Lizbeth Juarez-Bartolo
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 …
Diffusive Gradients In Thin-Films Passive Samplers For Quantitation Of Per- And Polyfluoroalkyl Substances In Water: Kinetic Modeling, Experimental Methods, And Outlook For Regulatory Monitoring, Samuel Hodges
Graduate Theses and Dissertations
Environmental sampling is the backbone of regulatory compliance in public water systems. Coupled with continuously improving analytical capabilities, grab sampling has revealed the ubiquity of emerging contaminants in water resources such as per- and polyfluoroalkyl substances (PFAS). The Environmental Protection Agency’s (EPAs) Method 533 and 537.1 specify 0.25 L grab samples undergo a solid phase extraction (SPE) to enrich PFAS up to 250-fold in 1 mL of methanol prior to analysis by liquid chromatography-tandem mass spectrometry (LC-MS/MS). This process can achieve lowest concentration minimum reporting levels (LCMRLs) between 0.53–16 ng•L−1 for the twenty-nine prioritized PFAS in drinking waters. However, toxicity …
Self-Consolidating Concrete Design For Drilled Shaft Structural Applications, Grady S. Caton
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 …
Comparing In-Situ Liquefaction Triggering Procedures For Sites In Arkansas, Sagar Barua
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 …
Development Of A Prototype Satellite-Tracking Telescope For Ground-Based Spectroscopy, Charles Smith
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 …
Developing Asphalt Mix Design Specifications Based On Apa And Ideal-Ct Testing, Jonathan Stonestreet
Developing Asphalt Mix Design Specifications Based On Apa And Ideal-Ct Testing, Jonathan Stonestreet
Graduate Theses and Dissertations
Some asphalt mixes, following the Superpave mix design procedure, have been reported to be too stiff, making cracking a prevalent form of pavement distress. Additionally, cracking has been reported to be the main form of distress of asphalt pavements in the State of Arkansas. These facts have heightened state agencies’ interest in better performing asphalt pavements, with Arkansas resolving to explore performance-based balanced mix designs (BMD), not yet explored in the state. The primary objective of this document is to present the completed study of balanced mix designs, based on the rutting and cracking potential of asphalt pavement mixtures through …