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Articles 1 - 30 of 2901
Full-Text Articles in Engineering
What Types Of Uncertainty Emerge In Instructional Aviation Incidents?, Abigail Henson
What Types Of Uncertainty Emerge In Instructional Aviation Incidents?, Abigail Henson
Mechanical Engineering Undergraduate Honors Theses
This study utilized narrative reports from the National Aeronautics and Space Administration (NASA) Aviation Safety Reporting System (ASRS) database to examine the types of uncertainty present in near-miss instructional aviation incidents occurring within the United States between 2015 and 2025. The final dataset consisted of 86 reports, with each report containing a set of narrative accounts from both the student pilot and the flight instructor operating under Part 91 regulations. Each instructional event was classified using a combined framework incorporating uncertainty categorizations and the Human Factors Analysis and Classification System (HFACS). Results indicate that epistemological uncertainty was the most common …
Cellulose Membrane Performance And Properties With Focus On Dialysis Application, Juliana Marçal
Cellulose Membrane Performance And Properties With Focus On Dialysis Application, Juliana Marçal
Graduate Theses and Dissertations
Chronic kidney disease affects approximately 35 million individuals in the United States, with nearly 550,000 patients dependent on dialysis for survival. Chronic kidney disease and end stage kidney disease impose substantial burdens on patients and healthcare systems, driving demand for improved dialysis membranes with enhanced flux, selectivity, and biocompatibility. The performance of dialysis membranes plays a critical role in treatment efficiency, governing solute transport, fluid removal, and overall therapeutic outcomes. In hemodialysis, membranes must achieve an optimal balance between high permeability and selective solute rejection while maintaining mechanical stability and long-term biocompatibility. Conventional dialysis membranes are commonly fabricated from polymeric …
Designing Functional Nanolaminates From Complex Atomic Layer Deposition Reactions, Joseph Joel Muhanga
Designing Functional Nanolaminates From Complex Atomic Layer Deposition Reactions, Joseph Joel Muhanga
Graduate Theses and Dissertations
Atomic layer deposition (ALD) enables precise cycle by cycle control over film thickness and composition. This kind of control is ideal for the engineering of functional nanolaminate coatings with tailored optical properties. Since ALD synthesized composite films are deposited as discrete, stratified layers and not as homogeneously intermixed solids, it is not yet clear when such composites can be be treated with the effective medium approximation (EMA). EMA is simplification that is important to the design of mixed oxide coatings. This dissertation addresses that question using a model system, and then asks whether the same approach can be used to …
Decoration Of Lactic Acid Bacterium By Exploiting In Vitro Sortase A Transpeptidase, Faisal Hamd Alqhtani
Decoration Of Lactic Acid Bacterium By Exploiting In Vitro Sortase A Transpeptidase, Faisal Hamd Alqhtani
Graduate Theses and Dissertations
Attaching a drug module to the surface of lactic acid bacteria was the main aim of this dissertation, and it was achieved. By using the Sortase A mechanism, the drug module (green fluorescent protein fused to the LPETG motif) was anchored to the LAB surface. To reach the final results, this dissertation will describe the process that I undertake to achieve the end goal. Modifying media, producing pure enzymes with less impurity, and reducing the protease activity in E. coli BL21 were all described in this five-chapter dissertation. Keywords: drug delivery, lactic acid bacteria, green fluorescent protein, sortase A, fusion …
Comparative Evaluation Of Similarity Metrics For Multi-Vendor Origin–Destination Matrix Comparison: A Case Study Using Data From Three Probe Data Vendors In Arkansas, Sagar Silwal
Graduate Theses and Dissertations
The proliferation of commercial probe data vendors has posed both opportunities and challenges for transportation agencies regarding the choice of reliable vehicle probe data for decision making purposes. Probe data is a form of passive mobility data representing a small fraction of the traveling population. Vendors aggregate mobility data from different sources including GPS enabled smartphones, telematics systems, and connected vehicles. They possess unique data collection methodologies, sampling mechanisms, and expansion algorithms which introduce variability in derived traffic performance measures like speed and volume. The overall objective of this work is to assess similarities and differences among probe data vendors …
Leveraging Data Science And Analytics For Next-Generation Transportation And Logistics: Literature Review And Regional Analysis, Kazi Humayra Shams
Leveraging Data Science And Analytics For Next-Generation Transportation And Logistics: Literature Review And Regional Analysis, Kazi Humayra Shams
Graduate Theses and Dissertations
The increasing integration of data science and analytics into next-generation transportation and logistics planning and operations offers improved system performance but requires managing and interpreting vast and complex datasets. The Arkansas Smart Transportation Research, Infrastructure and Data-Driven Engineering Systems (AR-STRIDES) program (NSF Award No. 2445877) is working to develop data science solutions and data-driven supply chain technologies for next-generation transportation and logistics systems. This thesis supports AR-STRIDES by providing a comprehensive literature review of recent literature studying data science and analytics in transportation and logistics systems and conducting a regional analysis of Arkansas to create a database of companies, higher …
Sigesn-Based Lasers On Silicon For Mid-Infrared Optoelectronics, Sudip Acharya
Sigesn-Based Lasers On Silicon For Mid-Infrared Optoelectronics, Sudip Acharya
Graduate Theses and Dissertations
Germanium-tin (GeSn) alloys represent a significant advancement in semiconductor technology, particularly for applications in the short-wave and mid-infrared (SWIR and MIR) spectral ranges. As a group IV material system, these alloys offer a unique combination of tunable optoelectronic properties and full compatibility with established silicon-based manufacturing processes. The controlled incorporation of tin into germanium enables the engineering of a fundamental direct bandgap, a critical feature that distinguishes GeSn from its indirect bandgap materials, silicon and germanium. This direct bandgap behavior which was demonstrated in high-quality single crystalline GeSn alloys around the year 2015 is the foundation for efficient light emission …
Advancing Social Media Analytics And Personalized Generation Via Transfer Learning, Discourse-Aware Modeling, And Collaborative Modeling, Gibson Nkhata
Graduate Theses and Dissertations
Social media platforms have become central to information exchange, shaping public opinion across social, political, and economic domains. However, the massive volume of user-generated content, combined with its informal, nuanced, and often noisy nature, presents significant challenges for automated analysis and generation. Tasks such as stance detection, rumor verification, and personalized content generation are further complicated by sarcasm, evolving discourse structures, and diverse user preferences. Addressing these challenges requires models that can effectively leverage linguistic nuance, conversational dynamics, and collaborative user signals. Transfer learning has emerged as a powerful paradigm for improving performance in low-resource and complex language understanding tasks. …
Proposed Risk-Based Framework To Predict Long-Term Performance Of Military Airfield Concrete Pavements, Dimitrios Kimon Tsirmpas
Proposed Risk-Based Framework To Predict Long-Term Performance Of Military Airfield Concrete Pavements, Dimitrios Kimon Tsirmpas
Graduate Theses and Dissertations
Concrete airfield pavements are designed following strict specifications to provide decades of performance and serviceability. The pavements are expected to withstand demanding operational loading and environmental conditions. However, long-term performance often strays from the expected results despite compliance to the specifications. This thesis establishes the foundation of a framework that links the mixture design test results to the in-service performance of airfield pavements. The goal of this work was to create the principles of a risk-based framework for pavement decision making using a case study on two similar airfields. With this quantitative framework established, the approval processes for concrete mix …
A Systems Analysis Of Autonomous Uav Swarm Spraying For Precision Agriculture, Ryker Davis
A Systems Analysis Of Autonomous Uav Swarm Spraying For Precision Agriculture, Ryker Davis
Graduate Theses and Dissertations
The application of Unmanned Aerial Vehicles (UAVs) in civilian sectors, particularly for precision agriculture and targeted aerial spraying, has rapidly evolved from passive monitoring to advanced, autonomous, multi-agent coordination. While deploying UAV swarms offers a promising solution to the payload and battery endurance limitations of single drone operations, realizing field-scale coverage introduces significant logistical and safety challenges. To evaluate the trajectory and viability of swarms, this study synthesizes bibliometric trends, operational simulation, and safety reporting analysis. First, because physical testing of complex swarms poses financial and safety risks, we developed an agent-based and discrete event simulation to evaluate autonomous spraying …
Design And Modeling Of A Robotic Manipulator For Agricultural Explorations, Trent Thomas Powell
Design And Modeling Of A Robotic Manipulator For Agricultural Explorations, Trent Thomas Powell
Graduate Theses and Dissertations
This thesis focuses on the modeling, design, and early testing of a spherical revolute revolute prismatic (RRP) robotic manipulator for probe based applications. The system is motivated by agricultural grain probing, where a probe is positioned over a truck bed and inserted into the grain to collect samples as trucks enter storage facilities, ports, hubs, or transfer points. A spherical RRP configuration is useful for this type of task because it provides a large accessible workspace while maintaining a relatively simple mechanical structure. A model based design approach is used to develop the system, beginning with forward and inverse kinematics …
Optimizing Escort Strategies For Chokepoint And Littoral Maritime Lanes Using Mixed-Integer Programming, Shantonu Mitra
Optimizing Escort Strategies For Chokepoint And Littoral Maritime Lanes Using Mixed-Integer Programming, Shantonu Mitra
Graduate Theses and Dissertations
Protecting high-value units (HVUs) while traversing maritime chokepoints under threats is a significant challenge that requires effective planning for allocating limited naval assets (escort ships, detection capabilities, and defensive capabilities). Although the weapon-to-target assignment problem has been previously studied in the literature, the problem of allocating limited naval assets under uncertain threat scenarios remains unexplored. This research develops a two-stage stochastic optimization framework with the objective of maximizing the expected weighted survivability of HVUs across all scenarios. The first-stage decisions include assigning available escorts to HVUs, selecting locations for deploying detection capabilities, and allocating defensive capabilities to each escort prior …
Development Of Medical Device For Hypovolemic Assessment Using Peripheral Venous Pressure, Connor J. Breshears
Development Of Medical Device For Hypovolemic Assessment Using Peripheral Venous Pressure, Connor J. Breshears
Graduate Theses and Dissertations
Accurate assessment of intravascular volume status remains challenging because traditional measurements such as heart rate, blood pressure, physical examination findings, and laboratory values may be subjective, delayed, or insensitive to early volume loss. Peripheral venous pressure (PVP) waveform analysis provides a potential approach for minimally invasive volume-status monitoring because PVP waveforms can be acquired from peripheral venous access and may contain frequency-domain information related to cardiac activity, respiratory modulation, vascular coupling, and intravascular filling. This thesis presents the development and evaluation of a proof-of-concept embedded prototype for PVP waveform acquisition and volume-status classification. The system integrates a Millar MEMS pressure …
Review And Experimental Demonstration Of The Concrete Maturity Method For Early Opening Of Arkansas Pavements, Chase Dykema
Review And Experimental Demonstration Of The Concrete Maturity Method For Early Opening Of Arkansas Pavements, Chase Dykema
Graduate Theses and Dissertations
Many Department of Transportation (DOT) specifications across the United States require a minimum time to gain strength for concrete pavements before they can be opened to construction equipment or traffic. This period is anywhere from three to seven days. However, concrete pavements can often be opened earlier as long as a minimum required strength is attained. With the development of modern pavement mixes, this strength can often be achieved well before the required curing period has passed. Allowing contractors to open pavements earlier increases construction efficiency. One nondestructive method of proving a pavement has achieved the required strength is the …
Coupled Effects Of Sub-Atmospheric Pressure And Surface Structures On Pool Boiling Performance And Hysteresis Pathways, Mohammad Ishraq Hossain
Coupled Effects Of Sub-Atmospheric Pressure And Surface Structures On Pool Boiling Performance And Hysteresis Pathways, Mohammad Ishraq Hossain
Graduate Theses and Dissertations
The increasing power density of microelectronics has created a need for cooling technologies capable of maintaining low operating temperatures. Sub-atmospheric pool boiling of water is promising because reducing saturation pressure lowers the boiling temperature, enabling two phase cooling within electronics-relevant temperature limits. However, reduced pressure also affects CHF, HTC, and post-CHF recovery. In this work, pool boiling experiments were conducted on flat copper, microchannel copper, and micro-pin-fin copper surfaces over 10–100 kPa to examine the coupled effects of pressure and surface structure. CHF and HTC increased with pressure, while structured surfaces enhanced both relative to flat copper. Surface structure dominated …
Soft Urea Nitridation Of Tantalum-Based Thin Films For Oxynitride Synthesis, Rishabh Srivastava
Soft Urea Nitridation Of Tantalum-Based Thin Films For Oxynitride Synthesis, Rishabh Srivastava
Graduate Theses and Dissertations
Rising global energy consumption and the transition toward low-carbon technologies place new demands on functional materials. Particularly, semiconductors that convert sunlight directly into chemical fuels with high efficiency and long operational lifetimes. The synthesis of visible light active tantalum oxynitride (TaON) thin films for photoelectrochemical (PEC) water splitting typically requires ammonolysis with pressurized NH3 gas, which presents persistent barriers in safety and phase selectivity. In this work, a soft urea ammonolysis route was employed in which solid urea was employed as an in-situ nitrogen source inside a vacuum-sealed reactor. The finite urea mass establishes a self-limiting nitrogen chemical potential that …
Integrated Sensing And Communication For Uavs With Oddm Waveforms, Mohammad Abdul Mobin
Integrated Sensing And Communication For Uavs With Oddm Waveforms, Mohammad Abdul Mobin
Graduate Theses and Dissertations
A new delay-Doppler (DD) integrated sensing and communications (ISAC) framework is proposed for unmanned aerial vehicle (UAV) systems. In the DD-ISAC framework, both sensing and communications are performed by using the orthogonal delay Doppler division multiplexing (ODDM) waveforms, which unify sensing and communication designs through their unique properties, such as local bi-orthogonality and dual-resolution in the DD domain. Specifically, the dual-resolution property enables the generation of delay-Doppler map for accurate and low complexity sensing, and the bi-orthogonality minimizes interference for both sensing and communications. The ODDM waveforms are used in combination with the phase comparison monopulse technique and a scaled …
Design, Fabrication, And Testing Of A Pdms-Based Nanochannel Using Nano Embossing, Cooper James Haskamp
Design, Fabrication, And Testing Of A Pdms-Based Nanochannel Using Nano Embossing, Cooper James Haskamp
Graduate Theses and Dissertations
DNA sequencing has become increasingly important in the field of biomedical research and clinical applications. Currently, the most well-established sequencing technique is ‘Sequencing by Synthesis’ with accuracy in the range of 99.2% to 99.74% and sequencing lengths of only 300 base pairs. Sequencing by Synthesis is a lab-based method that requires expensive equipment and fast parallel computing. It is not suitable for portable, on-site applications. A new technique known as ‘nanopore’ was developed to meet these requirements. Nanopore is an electrical sequencing method that relies on the translocation of a DNA molecule through a nanoscale pore, where the blockage current …
Instructions To Authors, Academy Editors
Instructions To Authors, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Journal Acknowledgements And Editorial Board, Academy Editors
Journal Acknowledgements And Editorial Board, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Keynote Address And Meeting Program, Academy Editors
Keynote Address And Meeting Program, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Business Meeting Report (Secretary's And Treasurer's Report), Academy Editors
Business Meeting Report (Secretary's And Treasurer's Report), Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Sperm Morphology In The Eastern Narrow-Mouthed Frog, Gastrophryne Carolinensis (Anura: Microhylidae), S. E. Trauth
Sperm Morphology In The Eastern Narrow-Mouthed Frog, Gastrophryne Carolinensis (Anura: Microhylidae), S. E. Trauth
Journal of the Arkansas Academy of Science
Studies by Scheltinga et al. (2002) and Scheltinga and Jamieson (2003) provide the most comprehensive analysis and only review of sperm morphology in Narrow-Mouthed Frogs (family Microhylidae). Of the 490+ species known to occur in this anuran family (Vitt and Caldwell 2014), only 3 are distributed in the United States (Powell et al. 2016), and 2 of these occur in Arkansas (Trauth et al. 2004). Surprisingly, sperm studies on only 12 microhylid species have been conducted (Scheltinga and Jamieson 2003), and no sperm studies are available on any North American species.
Multiple Nuclear Configurations And Microtubular Arrangements In Spermatozoa Of The Western Siren, Siren Nettingi (Caudata: Sirenidae), S. E. Trauth
Journal of the Arkansas Academy of Science
I examined the ultrastructure of spermatozoa of the Western Siren, Siren nettingi, using transmission electron microscopy. My primary objective in this study was to elucidate, for the first time, the unique morphological complexity of biflagellated sperm in this species. This study also represents my fifth addition in a series of investigations that highlight the novel nature of all aspects of spermatogenesis in this salamander I show the basic sperm transverse and sagittal design which includes a nucleus, 2 axial fibers supporting 2 undulating membranes which have 2 axonemes residing at their terminal ends, several circular mitochondria, and several electron-dense masses. …
Binucleation And Seasonal Cycle Of Sertoli Cells In The Western Lesser Siren, Siren Nettingi (Caudata: Sirenidae), S. E. Trauth
Binucleation And Seasonal Cycle Of Sertoli Cells In The Western Lesser Siren, Siren Nettingi (Caudata: Sirenidae), S. E. Trauth
Journal of the Arkansas Academy of Science
I examined binucleation and the seasonal cycle of Sertoli cells in the Western Siren (Siren nettingi) using light microscopy and transmission electron microscopy. My primary objective in this study was to report, for the first time, the presence of double nuclei in Sertoli cells in a salamander. This study also represents the sixth contribution in a series of investigations that highlight the novel nature of all aspects of spermatogenesis in this unique salamander. My findings add to a growing list of extraordinary morphological and reproductive features that distinguish this salamander from all other vertebrates.
Distal Urogenital Anatomy And Epithelial Morphology In The Male Eastern Narrow-Mouthed Frog, Gastrophryne Carolinensis (Anura: Microhylidae), S. E. Trauth
Journal of the Arkansas Academy of Science
I investigated the microanatomy of the distal urogenital system in male Eastern Narrow-Mouthed Frogs (Gastrophryne carolinensis) from a small sample (n = 5) collected in central Arkansas in April, May, and July (2021) and May 2022. Specifically, my primary goals were to elucidate the histology of the following: (1) the paired Wolffian (urogenital) ducts caudally from the kidneys to their merging with the urodeum of the cloaca, (2) the structure of seminal vesicles, and (3) the epithelial morphologies among the distal urogenital tract, the posterior alimentary canal, and the cloaca. My histological analysis confirmed the presence of …
Academy Presidents And Institutional Members, Academy Editors
Academy Presidents And Institutional Members, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Table Of Contents, Academy Editors
Table Of Contents, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Journal Of The Arkansas Academy Of Science Volume 79, Academy Editors
Journal Of The Arkansas Academy Of Science Volume 79, Academy Editors
Journal of the Arkansas Academy of Science
No abstract provided.
Equipping Biomedical Engineering Students With Clinical Needs Identification Skills: Insights From A Clinical Immersion Course, Lauren E. Edmunds
Equipping Biomedical Engineering Students With Clinical Needs Identification Skills: Insights From A Clinical Immersion Course, Lauren E. Edmunds
Biomedical Engineering Undergraduate Honors Theses
A major goal of biomedical engineering is the development of novel and innovative medical technology that advances and improves healthcare outcomes. An essential component of medical device design is identifying the clinical needs of patients and healthcare providers and applying engineering solutions to meet these needs. Our biomedical engineering department has developed a clinical and industry immersion course, which exposes students to the environment in which physicians and patients practice and engages students in this needs identification process. This study evaluates the impact of clinical immersion on undergraduate biomedical engineering students' confidence and perceived ability to identify and define unmet …