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Impact Of Equipment Type On Measured Particle Size Of Civil Engineering Materials, Tanner Turben
Impact Of Equipment Type On Measured Particle Size Of Civil Engineering Materials, Tanner Turben
Graduate Theses and Dissertations
Particle size analysis (PSA) captures the size distribution of fine-grained or emulsified materials with particles generally smaller than 1000 microns. Asphalt emulsions and many other civil engineering materials do not leverage PSA for material specifications or acceptance despite the insight into material performance and quality gained through understanding the particle size. The objectives of this study are to compare PSA measurement principles by testing 13 civil engineering materials by laser diffraction, Coulter counter, and microscopy and to develop a draft standard procedure for asphalt emulsion PSA. Asphalt emulsions, cementitious materials, sands, clays, and biological samples were selected to represent a …
Identifying Waterway Traffic Flow Patterns Using Modified Clustering, Shihao Pang
Identifying Waterway Traffic Flow Patterns Using Modified Clustering, Shihao Pang
Graduate Theses and Dissertations
Efficient management of inland waterways is essential for the economic and operational efficiency of transportation networks. Characterization and prediction of waterway vessel traffic flow patterns by time of day are critical for optimizing planned disruptive events like maintenance activities. This study identifies and predicts inland waterway traffic flow patterns along the Lower Mississippi River (LMR) using a modified clustering approach. A five-year period of Automatic Identification System (AIS) data, which tracks vessel movements in real-time, is used for model development and evaluation. The model first segments the river into approximately one-mile-long traffic message channels (TMCs) to estimate vessel counts and …
Scooting Through Urban Shared Micromobility Transformations: A Comprehensive Study Of Shared E-Scooter Usage Patterns, Pandemic Effects, And Equity Challenges, Farzana Mehzabin Tuli
Scooting Through Urban Shared Micromobility Transformations: A Comprehensive Study Of Shared E-Scooter Usage Patterns, Pandemic Effects, And Equity Challenges, Farzana Mehzabin Tuli
Graduate Theses and Dissertations
The rise of shared e-scooters has sparked a paradigm shift in urban transportation, offering a flexible mode of micromobility for short-distance travel. Since their US debut in September 2017, these electric scooters have gained popularity, surpassing traditional bikesharing services in many cities. This dissertation presents four studies that delve into various aspects of e-scooter adoption, from user behavior and pandemic effects to gender disparities and equitable access, providing comprehensive insights for urban mobility planning. The first study aims to determine (i) who uses shared e-scooters and why they use them, and (ii) what effects e-scooters have on the usage of …
Applying Uas Lidar For Developing Small Project Terrain Models, Ashraf Siddiqui
Applying Uas Lidar For Developing Small Project Terrain Models, Ashraf Siddiqui
Graduate Theses and Dissertations
Unmanned aerial systems (UAS) LiDAR was used to collect survey data for small-area projects, particularly bridge replacement projects. The project aimed to compare UAS LiDAR data with conventional surveying methods. For the project, five bridge sites were selected for UAS LiDAR and conventional survey data collection, which include Lincoln Bridge 1 (East), Lincoln Bridge 2 (West), Humnoke, Frenchman’s Bayou, and Mountain Home. Data for each site was collected during the 2021–2022 winter. A DJI M600 Pro and Phoenix LiDAR Systems AL3-16 LiDAR unit were used for the UAS LiDAR measurements. The conventional survey equipment used included a global navigation satellite …
Real-Time Barge Detection Using Traffic Cameras And Deep Learning On Inland Waterways, Geoffery Eyram Agorku
Real-Time Barge Detection Using Traffic Cameras And Deep Learning On Inland Waterways, Geoffery Eyram Agorku
Graduate Theses and Dissertations
Inland waterways are critical for freight movement, but limited means exist for monitoring their performance and usage by freight-carrying vessels, e.g., barges. While methods to track vessels, e.g., tug and tow boats, are publicly available through Automatic Identification Systems (AIS), ways to track freight tonnages and commodity flows carried on barges along these critical marine highways are non-existent, especially in real-time settings. This paper develops a method to detect barge traffic on inland waterways using existing traffic cameras with opportune viewing angles. Deep learning models, specifically, You Only Look Once (YOLO), Single Shot MultiBox Detector (SSD), and EfficientDet are employed. …
Advancing Prediction And Decision Analytics Techniques To Improve Treatment Of Tuberculosis, Maryam Kheirandish Borujeni
Advancing Prediction And Decision Analytics Techniques To Improve Treatment Of Tuberculosis, Maryam Kheirandish Borujeni
Graduate Theses and Dissertations
Tuberculosis (TB) remains a global health challenge, significantly impacting morbidity and mortality rates worldwide. Despite advancements in diagnosis and treatment, TB continues to pose substantial challenges, particularly in low-resource settings. This dissertation aims to develop a robust treatment monitoring framework for TB patients to ensure personalized and effective treatment using demographic and clinical information. The current standard TB treatment framework, recommended by the World Health Organization (WHO), involves monitoring patients through laboratory tests such as smear and culture sputum tests at specific time points during treatment. These tests, however, are not fast and accurate enough to determine the severity of …
Winter Texans: A Study Of Community And Belonging In An Overlooked Border Identity In The Lower Rio Grande Valley, Belinda D. Smith
Winter Texans: A Study Of Community And Belonging In An Overlooked Border Identity In The Lower Rio Grande Valley, Belinda D. Smith
Graduate Theses and Dissertations
This study centers around a population of retired Anglos who migrate to South Texas border towns in the Lower Rio Grande Valley (locally known as The Valley) from October through March each year. Many travel in recreational vehicles (RVs) and hail from the United States and Canada to set up home in one of The Valley’s RV parks. They are called Winter Texans by themselves and locals. Scholarly research focused on Winter Texans explores how they are motivated to move because of lower costs of living (Murray 2020), how they travel for medical reasons, and their use of Mexican health …
Evaluating Margin Protection (Mp) Crop Insurance As A Risk Management Tool For Rice Producers In Arkansas, Kaleem Azmat Chattha
Evaluating Margin Protection (Mp) Crop Insurance As A Risk Management Tool For Rice Producers In Arkansas, Kaleem Azmat Chattha
Graduate Theses and Dissertations
Agricultural producers bear many risks, including production risks stemming from uncertainty in weather and pest pressure and price risks arising from market volatility. Federal Crop Insurance has become one of the most popular tools to manage these risks. While yield and revenue crop insurance tend to be the most popular production and price risk management tools provided by the government, participation in Margin Protection insurance lags far behind despite providing production, crop price, and input price risk protection. This study aims to uncover whether Margin Protection crop insurance is an effective risk management tool by estimating the optimal coverage level …
Investigation Of Optically Pumped Gesn Quantum Well Lasers, Grey Steven Abernathy
Investigation Of Optically Pumped Gesn Quantum Well Lasers, Grey Steven Abernathy
Graduate Theses and Dissertations
Silicon photonic integrated circuits enable the capability of producing on-chip processing of photonic signals, including both emission and detection. Emission materials, however, have been limited for monolithic integration due to high processing temperatures, indirect bandgap materials, and material integration complications. The (Si)GeSn material system has recently attracted attention due to the bandgap transition from the Si and Ge, naturally indirect bandgap, to direct bandgap with sufficient Sn incorporation. Additionally, the low growth temperature (CMOS compatible; <400 >°C) of (Si)GeSn materials can enable the monolithic integration of the highly desired mid-infrared light emission on the Si Photonic platform. This dissertation first discusses …
Tissue Engineered Models Of Environmental And Metabolism-Driven Cancer-Nerve Crosstalk, Emory Gregory
Tissue Engineered Models Of Environmental And Metabolism-Driven Cancer-Nerve Crosstalk, Emory Gregory
Graduate Theses and Dissertations
Purpose: Within the last 30 years, cancer-nerve interactions have garnered attention for causing patient pain, increasing the risk of recurrence, and decreasing patient prognosis. There are 2 key forms cancer-nerve crosstalk takes: perineural invasion (PNI), in which cancer cells infiltrate nerves as a route for metastasis, and tumor innervation (TI), in which neurites penetrate solid tumors to promote tumor progression. Present in vitro models of cancer-nerve crosstalk primarily include Matrigel® mouse matrix and collagen I hydrogels; whereas collagen I hydrogels neglect tumor extracellular matrix (ECM) complexity, Matrigel® is controversial for its batch-to-batch inconsistencies and inclusion of experiment-altering growth factors. Decellularized …
Gan With Skip Patch Discriminator For Biological Electron Microscopy Image Generation, Nishith Ranjon Roy
Gan With Skip Patch Discriminator For Biological Electron Microscopy Image Generation, Nishith Ranjon Roy
Graduate Theses and Dissertations
GAN models have been successfully used for image generation in various sections such as real-life objects like human faces, cars, animal faces, landscapes, etc. This work focuses on biological electron microscopy (EM) image generation. Unlike other real-life objects, biological EM images are obtained through electron microscopy techniques to study biological specimens. Electron microscopy offers high resolution and magnification capabilities, making it a powerful tool for visualizing biological structures at the nanoscale. However, using GAN models for biological EM image generation poses challenges due to the complex and unique arrangements of biological structures and the sparse and asymmetrical patterns in EM …
Feasibility Assessment And Container Traffic Forecasting Of Inland Waterway Container On Barge Transportation, Fan Bu
Graduate Theses and Dissertations
Container on Barge (COB) transportation is an intermodal freight transport mode that moves shipping containers via barges on navigable inland and intracoastal waterways. During the past twenty years, COB has been a growing mode of container shipping globally due to its low-cost, eco-friendly, and congestion-reducing characteristics. Europe and China are currently leading global COB transportation, and the United States (U.S.) may have the potential to achieve economic benefits through the implementation of COB within its intermodal transportation system. To explore this potential, this dissertation investigates the implementation feasibility of COB transportation within the U.S. intermodal freight transportation system. Three contributions …
How Supply Chains Respond To Disruptions: Three Essays On Responses To Operational, Geopolitical, And Natural Disaster Disruptions, Travis Kulpa
Graduate Theses and Dissertations
The ability to respond to supply chain disruptions efficiently and effectively is a highly sought after capability, particularly in light of recent events such as the COVID-19 pandemic, geopolitical conflicts, and major natural disasters. These events have led researchers, practitioners, and policymakers to ask: how can we better use our resources to respond to supply chain disruptions? This dissertation examines responses to the three main types of supply chain disruptions: operational disruptions, geopolitical disruptions, and natural disasters. The first study examines how US importers adjust between air and containerized transportation in response to shipment delays and abnormally high demand from …
Exploring Telehealth Utilization Through Data Analytics, Statistical Analyses, And Machine Learning Techniques, Aysenur Betul Cengil
Exploring Telehealth Utilization Through Data Analytics, Statistical Analyses, And Machine Learning Techniques, Aysenur Betul Cengil
Graduate Theses and Dissertations
This dissertation investigates the utilization of telehealth services, initially focusing on the Arkansas healthcare system and then extending the analysis nationwide. It aims to understand the factors influencing telehealth adoption and its impact on healthcare delivery. After examining telehealth utilization in Arkansas from 2018 to 2022, the research utilizes a comprehensive dataset from Epic Cosmos, which includes a wide range of patient and visit data from multiple healthcare facilities across the United States from 2018 to 2023. This timeframe allows for a detailed analysis of telehealth trends before, during, and after the COVID-19 pandemic. In Chapter 2, we analyze key …
Computational Models That Exploit Spatial, Temporal, And Voltage-Current Relationships In The Electrochemical Generation-Collection Of Redox-Active Molecules, Miguel Angel Abrego Tello
Computational Models That Exploit Spatial, Temporal, And Voltage-Current Relationships In The Electrochemical Generation-Collection Of Redox-Active Molecules, Miguel Angel Abrego Tello
Graduate Theses and Dissertations
The numerical studies in this dissertation explore the application of redox cycling, an advanced electrochemical technique, for analyzing bioelectrochemical systems with a particular focus on small-volume samples and involves electrodes that can be activated to oxidize and reduce, separated by varying distances and featuring different geometries. The redox cycling approach facilitates the spatio-temporal interrogation of kinetics, mass transport, and the quantification and identification of chemical systems. We optimize a previously fabricated neural probe design on an SU-8 substrate, featuring coplanar arrays of nine microband electrodes suited for in vivo applications. Through comprehensive in situ and in silico redox cycling studies …
Essays On Networks And Gender Dynamics In Corporate Finance, Xiaonan Wei
Essays On Networks And Gender Dynamics In Corporate Finance, Xiaonan Wei
Graduate Theses and Dissertations
In my dissertation, I explore the effect of networks and gender dynamics on corporate finance. In my first essay, I examine the effects of personal network on insider trading decisions. Using COVID-19 as a shock to test personal network effect, I find individuals were influenced by information about COVID-19 provided by the members of their personal networks. S&P 1500 insiders whose personal networks contained higher fractions of socially connected individuals from countries affected by early stages of COVID-19 were more likely to sell shares of their firms in the period preceding the U.S. stock market decline, and they are less …
Modeling, Optimization, And Characterization For Choke Horn Antennas, Ibrahim Nasser I Alquaydheb
Modeling, Optimization, And Characterization For Choke Horn Antennas, Ibrahim Nasser I Alquaydheb
Graduate Theses and Dissertations
This dissertation presents a comprehensive study focusing on the modeling, optimization, and characterization of choke horn antennas (CHAs). An analytical model designed to capture the parameters of CHA and derive the total radiated fields from the choke and waveguide elements is primarily focused on in this work. Compared to the use of simulation software, such as ANSYS HFSS (High Frequency Structure Simulator) or CST Studio, which employs numerical methods to simulate and calculate antenna performance, numerous advantages are offered by the analytical model. Analytical models provide deeper insight into electromagnetic interactions and the principles governing antenna behavior, leading to a …
Rural-Urban Migration And The Extent Of Urbanization: A Case Study Of Rural Migrants From Northern Ghana To Accra, Daniel Kissi-Somuah
Rural-Urban Migration And The Extent Of Urbanization: A Case Study Of Rural Migrants From Northern Ghana To Accra, Daniel Kissi-Somuah
Graduate Theses and Dissertations
This study delves into the dynamics of rural-to-urban migration, emphasizing its impact on urbanization in the unique context of Ghana. As migration patterns evolve globally, understanding the motivations and challenges of internal migration is crucial for informed policy-making. The case study focuses on migrants from Northern Ghana to Accra, exploring factors propelling urbanization, challenges in urban job searches, and proposing strategies for managing urbanization. The research uses a comprehensive methodology to draw on extensive data from the 2021 Population and Housing Census. Utilizing thematic reports on migration, economic activities, background characteristics, and education, the study employs descriptive and inferential statistical …
Development Of A High-Throughput Screening Platform To Profile Gene Delivery And Transcriptional Control In Macrophages, Alexis Ivy
Graduate Theses and Dissertations
Macrophages are an important cell type in the body responsible for orchestrating the inflammatory response and return to homeostasis. Macrophages are often implicated in a multitude of disease pathologies including delayed wound healing, excessive fibrosis, autoimmune disease, and immunosuppression within the tumor microenvironment. Although macrophages have been targeted for therapeutic applications, success in utilizing them has remained elusive due to their relative ease of phenotype switching between inflammatory and anti-inflammatory. The challenge that remains is developing clinically relevant delivery vehicles that can target macrophages without causing a phenotypic switch counter-productive to the desired response. This is especially important when targeting …
Cancer Heterogeneity And Mitochondrial-Targeted Therapies In Cancer Cachexia, Francielly Morena Clark
Cancer Heterogeneity And Mitochondrial-Targeted Therapies In Cancer Cachexia, Francielly Morena Clark
Graduate Theses and Dissertations
Cancer Cachexia (CC) is a multifactorial and complex syndrome affecting up to 80% of cancer patients and contributing to approximately 40% of cancer-related deaths. Given its relationship with patients' quality of life and prognosis, there has been increasing emphasis on understanding the underlying mechanisms of CC using pre-clinical models. However, the mechanisms of cachexia vary depending on several factors, including tumor type, model, and biological variables such as sex. RNA-sequencing technology is a crucial tool for investigating CC heterogeneity, enabling the analysis of the transcriptome across different models, conditions, and sexes using publicly available data. Aim 1 of this dissertation …
Molecular Beam Epitaxy Of Gesn On Iii-V Substrates For Photonic Applications, Calbi Gunder
Molecular Beam Epitaxy Of Gesn On Iii-V Substrates For Photonic Applications, Calbi Gunder
Graduate Theses and Dissertations
This dissertation explores the advancement of germanium-tin (GeSn) as a tuneable narrow bandgap material, crucial for the development of high-efficiency photodetectors and laser devices in near- and mid-infrared technologies. We investigate the synthesis challenges, particularly the lattice mismatch between GeSn alloys and substrates, which significantly affects their crystalline and optical qualities. Through molecular beam epitaxy, we examine the growth of Ge and GeSn on GaAs (001) substrates, employing Ge/GaAs and Ge/AlAs buffer layers to investigate these challenges. Our findings, characterized by X-ray diffraction, atomic force microscopy, reflection high-energy electron diffraction, and photoluminescence, demonstrate the production of high-quality Ge layers, achieving …
The Impact Of Ectopic Expression Of A Plant Elicitor Peptide In Bacillus Subtilis On Nematode Resistance In Soybean Through Seed Treatment, Abeer Alnasrawi
The Impact Of Ectopic Expression Of A Plant Elicitor Peptide In Bacillus Subtilis On Nematode Resistance In Soybean Through Seed Treatment, Abeer Alnasrawi
Graduate Theses and Dissertations
Soybean (Glycine max) is the most beneficial legume crop because it is a source of protein as well as oil for humans and livestock. Soybean is the second most planted crop in the United States following corn and it is also the fourth planted crop worldwide. However, the soybean cyst nematode (Heterodera glycines, SCN) is the most damaging pest of soybean in the United States, accounting for more than twice as much yield loss as the following cause of yield loss in soybean. Therefore, there is a pressing need to develop alternative management strategies to control SCN infection in soybeans. …
Essays On Empirical Investigation Of Extended Warranties Of Consumer Electronics, Vasavi Rayachoty
Essays On Empirical Investigation Of Extended Warranties Of Consumer Electronics, Vasavi Rayachoty
Graduate Theses and Dissertations
Extended warranties (EW) have gained significant traction as a powerful revenue stream for retailers, boasting substantial profit margins ranging from 50% to 70% (Bloomberg week). These warranties offer consumers peace of mind by providing additional protection beyond the standard manufacturer warranty and are to be purchased at an additional cost. By offering extended warranties, retailers can differentiate themselves in a competitive market, build stronger customer relationships, and enhance their overall profitability. However, effectively capitalizing on their potential necessitates a strategic approach. The extant literature is focused on studying extended warranties from the perspective of a consumer and lacks a retailer …
Impacts Of High-Frequency Operation On Magnetics And Performance On Isolated Power Electronic Converter Design, David Arturo Porras Fernandez
Impacts Of High-Frequency Operation On Magnetics And Performance On Isolated Power Electronic Converter Design, David Arturo Porras Fernandez
Graduate Theses and Dissertations
The pursuit of high-power density and high switching frequency is a central theme in the advancement of power electronic converters. While these parameters offer significant benefits in terms of compactness and performance, they also introduce challenges related to efficiency and thermal management. This doctoral dissertation aims to provides a design framework to analyze the implications of high-frequency operation (> 100 kHz) on magnetics design and performance in power electronic converters, particularly when integrating silicon carbide (SiC) power modules. It examines the advantages and disadvantages of high-frequency operation and delves into its effects on the performance of the converter, focusing on …
Three Essays Examining Technology Adoption And The Role Of Physicians In Improving Efficiency, Quality And Reducing Risk In Healthcare Supply Chains, Rajib Dutta
Graduate Theses and Dissertations
Hospitals across the USA are operating under extreme financial stress and looking for opportunities to improve financial stability and maximize bottom-line savings. As supply chain function accounts for up to 40 percent of total hospital operating cost, hospital leaders are increasingly viewing the healthcare supply chain as a potential area for efficiency gain and cost reduction. The recipe for effective and efficient care delivery is to synchronize the flow of supplies with patient needs by integrating products, processes, and information while complying with government regulations. Therefore, proper management of inventory, role of government policies in shaping hospital strategies, adoption of …
High-Power Power Conditioning Systems For Medium-Voltage Applications, Ahmed Rahouma Fares Rahouma
High-Power Power Conditioning Systems For Medium-Voltage Applications, Ahmed Rahouma Fares Rahouma
Graduate Theses and Dissertations
The purpose of this dissertation is to address the background, theoretical analyses, design methodologies, and evaluation techniques relevant to high-power power conditioning systems (PCSs) tailored for medium-voltage (MV) applications. Conventional PCSs, reliant on line-frequency transformers (LFTs), suffer from many problems including low power densities, inflexible designs, and scalability constraints. Employing multilevel converters (MLCs), particularly cascaded H-bridge topology, eliminates the need for these LFTs. A key focus lies in minimizing the number of cascaded building blocks by harnessing MV power switching modules. The dissertation makes two primary contributions: firstly, it offers a design methodology for MV-PCS, facilitating the selection of the …
Evaluation, Modeling And Application Of Gallium Nitride Field Effect Transistor, Geno Guillaume
Evaluation, Modeling And Application Of Gallium Nitride Field Effect Transistor, Geno Guillaume
Graduate Theses and Dissertations
Gallium Nitride (GaN) has emerged as one of the leading materials for power devices due to its wide band gap and high electron mobility. The band gap is the minimum energy required to excite an electron up to a state in the conduction band where it can participate in conduction. Because of this, wide band gap (WBG) materials are favorable for various electrical applications. The market for GaN high-electron-mobility transistor (HEMT) is projected to exceed $1.25 billion by 2027. With the increase of market interest, modern technologies emerge that aim to push the boundaries of efficiency for GaN power devices. …
Investigating The Applications Of Peps To The Measurement Of The Stabilities Of Staphylococcal Nuclease (Stw) And Human Acidic Fibroblast Growth Factor (Hfgf1), Motolani Omolade Matthew
Investigating The Applications Of Peps To The Measurement Of The Stabilities Of Staphylococcal Nuclease (Stw) And Human Acidic Fibroblast Growth Factor (Hfgf1), Motolani Omolade Matthew
Graduate Theses and Dissertations
This dissertation presents a detailed investigation into the applications of Protein Equilibrium Population Snapshot H/D Exchange Electrospray Ionization Mass Spectrometry (PEPS-H/D exchange or PEPS) method. This method is based on protein equilibrium unfolding, and its fundamental capability is to capture a "snapshot" of the protein's state, allowing us to monitor the ratio of the unfolded to folded populations at different chemical denaturant concentrations. First, to increase the accuracy of PEPS data analysis for assessing protein stability, the traditional linear extrapolation method (LEM) was replaced. Instead of using LEM, which calculates free energy change based on the peak ratio of unfolded …
Instrument Not Ornament: Exploring Women’S Experiences Of Body Objectification And Belonging To An All-Women’S Mountain Biking Group In The Ozarks, Katherine Ketchum
Instrument Not Ornament: Exploring Women’S Experiences Of Body Objectification And Belonging To An All-Women’S Mountain Biking Group In The Ozarks, Katherine Ketchum
Graduate Theses and Dissertations
Description: Despite the attention given to body positivity, body neutrality, and body appreciation, women are consistently and overwhelmingly experiencing body objectification and its harmful effects being normalized by society and internalized individually (Shorter et al., 2008). At the same time, the popularity of mountain biking for women and all-women's mountain biking groups in the Ozarks has grown exponentially in recent years, yet gender stereotypes and disparities for women remain (Irvin et al., 2021). The purpose of this study was to make meaning of (1) women’s experiences of body objectification and (2) women’s experiences belonging to an all-women's mountain biking group …
Parallel Degree Planning In The Pursuit Of Academic Success For Pre-Nursing Students In A Competitive Entry Baccalaureate Nursing Programs, Elizabeth L. Mckinley
Parallel Degree Planning In The Pursuit Of Academic Success For Pre-Nursing Students In A Competitive Entry Baccalaureate Nursing Programs, Elizabeth L. Mckinley
Graduate Theses and Dissertations
This study sought to understand the student perceptions of parallel academic degree planning for the competitive entry undergraduate Nursing program at a case study university. Parallel degree planning is a relatively new term of alternative curricular planning. The qualitative study includes nine students and their experiences in planning for their intended major while simultaneously planning courses that meet another major or degree program, and understanding how parallel degree planning aided their retention and student satisfaction as well as their academic advisor interaction. The study was completed at a research university where the Nursing program has a very lower acceptance rate, …