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Full-Text Articles in Entire DC Network
Numerical Investigation Of The Effect Of Trailing Edge Deformations On Noise From Jets Exhausting Over Flat Plates, Colby N. Horner
Numerical Investigation Of The Effect Of Trailing Edge Deformations On Noise From Jets Exhausting Over Flat Plates, Colby N. Horner
Theses and Dissertations
The design of aircraft propulsion configurations must digress from the typical configurations that are utilized on the majority of aircraft in order to consider the effects of environmental issues as well as the noise that is generated from the engines. One unconventional approach under consideration involves rectangular jets near flat surfaces that are parallel to the jet axis. This type of configuration makes an attempt to muffle the noise that propagates to the ground, but previous experimental work showed that the noise generated by this configuration was actually increased due to the effect that the plate trailing edge exerts on …
Annealing Enabled Immune System Algorithm For Multi-Waypoint Navigation Of Autonomous Robots, Elakiya Jayaraman
Annealing Enabled Immune System Algorithm For Multi-Waypoint Navigation Of Autonomous Robots, Elakiya Jayaraman
Theses and Dissertations
In real world applications such as rescue robots, service robots, mobile mining robots, and mine searching robots, an autonomous mobile robot needs to reach multiple goals with the shortest path while avoiding obstacles. In this thesis, we propose Artificial Immune System (AIS) based algorithms and two hybrids based on AIS associated with the Simulated Annealing (SA) algorithm and Voronoi Diagram (VD) for real-time map building and path planning for multi-goal applications. A global route is initially planned by the Immune System Algorithm (ISA). Then the created path is used to guide the robot to multiple waypoints following the foraging trail. …
Sclerostin As A Potential Therapy For Medial Vascular Calcification Through The Inhibition Of The Wnt/Beta-Catenin Pathway, Jada S. Boone
Sclerostin As A Potential Therapy For Medial Vascular Calcification Through The Inhibition Of The Wnt/Beta-Catenin Pathway, Jada S. Boone
Theses and Dissertations
Cardiovascular disease is among the leading causes of death in the US. It stems from the pathological buildup of plaque within the vasculature known as vascular calcification. Medial calcification, or arteriosclerosis is the buildup of plaque within the medial layer of the arteries resulting in artery wall stiffening and reduction of blood flow. Evidence suggests that the vascular smooth muscles cells (VSMCs) that line the medial layer of the arteries, undergo a phenotypic switch to osteoblast-like cells to deposit calcium while in this pathological state. The Wnt/BETA-catenin pathway could potentially play a role in the phenotypic modulation. Inhibition of the …
The Effects Of Engineering Discipline Depth And Specificity On Occupational Alignment, Graduate School Decisions, And Engineering Identity, Jenna Lynn Johnson
The Effects Of Engineering Discipline Depth And Specificity On Occupational Alignment, Graduate School Decisions, And Engineering Identity, Jenna Lynn Johnson
Theses and Dissertations
Retention of engineering students to graduation and career is important business for both United States (U.S.) industries and engineering education institutions alike. Industries need competent engineers dedicated to working in the field of engineering beyond graduation in order to achieve business success and national economic growth, while engineering education institutions need retention to graduation to achieve their own business goals. This dissertation took a three-pronged approach to identifying relationships between depth and specificity of engineering and response factors related to graduation and career retention of engineers. Occupational alignment, graduate school decisions, and engineering identity were evaluated for relationships with specificity …
Development Of A Detect-And-Avoid Sensor Solution For The Integration Of A Group 3 Large Unmanned Aircraft System Into The National Airspace System, Kyle Bradley Ryker
Development Of A Detect-And-Avoid Sensor Solution For The Integration Of A Group 3 Large Unmanned Aircraft System Into The National Airspace System, Kyle Bradley Ryker
Theses and Dissertations
Unmanned Aircraft Systems (UAS) face one common challenge when integrating with the existing manned aircraft population in the National Airspace System (NAS). To unlock the full efficiency of UAS, the UAS integrator must comply with an onboard pilot’s requirement to see-and-avoid other aircraft while operating. Commercially available Detect-and-Avoid (DAA) sensor technologies have been developed to attempt to comply with this requirement. UAS integrators must use these sensors to meet or exceed the performance of a human pilot. This thesis covers research done to integrate an array of commercially made DAA sensors with a large Group 3 UAS both in hardware …
Degradation Modeling And Degradation-Aware Control Of Power Electronic Systems, Moinul Shahidul Haque
Degradation Modeling And Degradation-Aware Control Of Power Electronic Systems, Moinul Shahidul Haque
Theses and Dissertations
The power electronics market is valued at $23.25 billion in 2019 and is projected to reach $ 36.64 billion by 2027. Power electronic systems (PES) have been extensively used in a wide range of critical applications, including automotive, renewable energy, industrial variable-frequency drive, etc. Thus, the PESs' reliability and robustness are immensely important for the smooth operation of mission-critical applications. Power semiconductor switches are one of the most vulnerable components in the PES. The vulnerability of these switches impacts the reliability and robustness of the PES. Thus, switch-health monitoring and prognosis are critical for avoiding unexpected shutdowns and preventing catastrophic …
Advanced Data Analytics Methodologies For Anomaly Detection In Multivariate Time Series Vehicle Operating Data, Morteza Alizadeh
Advanced Data Analytics Methodologies For Anomaly Detection In Multivariate Time Series Vehicle Operating Data, Morteza Alizadeh
Theses and Dissertations
Early detection of faults in the vehicle operating systems is a research domain of high significance to sustain full control of the systems since anomalous behaviors usually result in performance loss for a long time before detecting them as critical failures. In other words, operating systems exhibit degradation when failure begins to occur. Indeed, multiple presences of the failures in the system performance are not only anomalous behavior signals but also show that taking maintenance actions to keep the system performance is vital. Maintaining the systems in the nominal performance for the lifetime with the lowest maintenance cost is extremely …
The Role Of A Sickled Microenvironment In Cardiac Dysfunction, Allison Nicole Healey
The Role Of A Sickled Microenvironment In Cardiac Dysfunction, Allison Nicole Healey
Theses and Dissertations
This study helps to fill a remaining knowledge gap surrounding the mechanisms and pathways that contribute to cardiomyopathies in SCD. A better understanding of the pathophysiological mechanisms could lead to more accurate therapeutic targets to improve quality of life as well as life expectancy. In this study I recapitulate cardiac dysfunction in vitro by exposing engineered mouse cardiac tissues to ANG II or the sickled microenvironment. Experimental results include gene expression profiles and oxidative stress generation. Gene expression profiles in the ANG II treated tissues indicated a pathological state with upregulation in biomarkers for inflammation, cell adhesion, wall stress and …
Optimizing A Biomass Supply System: Consideration Of Pellet Quality And Transportation Under Extreme Events, Badr S. Aladwan
Optimizing A Biomass Supply System: Consideration Of Pellet Quality And Transportation Under Extreme Events, Badr S. Aladwan
Theses and Dissertations
This dissertation studies a framework in support biomass wood pellet supply chain. The worldwide wood pellet market is growing at a phenomenal rate. However, the economic sustainment of this business depends on how well the producers manage the uncertainty associated with biomass yield and quality. In the first part of the dissertation, we propose a two-stage stochastic programming model that optimizes different critical decisions (e.g., harvesting, storage, transportation, quality inspection, and production decisions) of a biomass-to-pellet supply system under biomass yield and quality uncertainty to economically produce pellets while accounting for the different pellet standards set forward by the U.S. …
Electric Vehicles Fast Charger Location-Routing Problem Under Ambient Temperature, Darweesh Ehssan A Salamah
Electric Vehicles Fast Charger Location-Routing Problem Under Ambient Temperature, Darweesh Ehssan A Salamah
Theses and Dissertations
Electric cars are projected to become the vehicles of the future. A major barrier for their expansion is range anxiety stemming from the limited range a typical EV can travel. EV batteries' performance and capacity are affected by many factors. In particular, the decrease in ambient temperature below a certain threshold will adversely affect the battery's efficiency. This research develops deterministic and two-stage stochastic program model for charging stations' optimal location to facilitate the routing decisions of delivery services that use EVs while considering the variability inherent in climate and customer demand. To evaluate the proposed formulation and solution approach's …
Angular-Dependent Three-Dimensional Imaging Techniques In Multi-Pass Synthetic Aperture Radar, Jan Rainer Jamora
Angular-Dependent Three-Dimensional Imaging Techniques In Multi-Pass Synthetic Aperture Radar, Jan Rainer Jamora
Theses and Dissertations
Humans perceive the world in three dimensions, but many sensing capabilities only display two-dimensional information to users by way of images. In this work we develop two novel reconstruction techniques utilizing synthetic aperture radar (SAR) data in three dimensions given sparse amounts of available data. We additionally leverage a hybrid joint-sparsity and sparsity approach to remove a-priori influences on the environment and instead explore general imaging properties in our reconstructions. We evaluate the required sampling rates for our techniques and a thorough analysis of the accuracy of our methods. The results presented in this thesis suggest a solution to sparse …
Novel Considerations For Lightning Strike Damage Mitigation Of Carbon Fiber Reinforced Polymer Matrix (Cfrp) Composite Laminates, Kamran Yousefpour
Novel Considerations For Lightning Strike Damage Mitigation Of Carbon Fiber Reinforced Polymer Matrix (Cfrp) Composite Laminates, Kamran Yousefpour
Theses and Dissertations
Lightning current with high amplitude disseminates through the body of aircraft and causes physical damages including the delamination and puncture of materials. Also , such high-amplitude and high-frequency current could interfere with electronic devices through electromagnetic coupling with the conductive interfaces of an airplane. Hence, robust protection against lighting strike is essential in the aerospace industry. Carbon Fiber Reinforced Polymer (CFRP) Matrix Composites have become significant alternatives to conventional metal-base materials. Despite the superior physical and structural properties of CFRP composites, these materials are vulnerable to lightning strikes due to the low electrical conductivity compared to the metal counterpart. Many …
Exploring The Use Of Neural Network-Based Band Selection On Hyperspectral Imagery To Identify Informative Wavelengths For Improving Classifier Task Performance, Preston Chandler Darling
Exploring The Use Of Neural Network-Based Band Selection On Hyperspectral Imagery To Identify Informative Wavelengths For Improving Classifier Task Performance, Preston Chandler Darling
Theses and Dissertations
Hyperspectral imagery is a highly dimensional type of data resulting in high computational costs during analysis. Band selection aims to reduce the original hyperspectral image to a smaller subset that reduces these costs while preserving the maximum amount of spectral information within the data. This thesis explores various types of band selection techniques used in hyperspectral image processing. Modifying Neural network-based techniques and observing the effects on the band selection process due to the change in network architecture or objective are of particular focus in this thesis. Herein, a generalized neural network-based band selection technique is developed and compared to …
Assessment And Optimization Of Marsh Terracing For Wetland Restoration In The Northern Gulf Of Mexico Using Remote Sensing And A Wave Model Approach, Raúl Jefferson Osorio Morillo
Assessment And Optimization Of Marsh Terracing For Wetland Restoration In The Northern Gulf Of Mexico Using Remote Sensing And A Wave Model Approach, Raúl Jefferson Osorio Morillo
Theses and Dissertations
Coastal Louisiana U.S. is facing wetland loss caused mainly by geologic subsidence and sea-level rise. These losses are accelerated by human activities such as the creation of canals and waterways for gas and oil extraction. Wetland loss in coastal Louisiana has encouraged to the implementation of various wetland restoration techniques. Marsh terraces are a one restoration technique consisting of segmented berms of soil that are built in inland coastal ponds. They are designed to increase marsh area, dissipate wind driven waves, encourage marsh expansion, and possibly reduce shoreline erosion. Marsh terraces have been implemented for almost 30 years; however, little …
Capturing Structure-Property Relationships Of Complex Gels With Physical And Chemical Crosslinking, Rosa Maria Badani Prado
Capturing Structure-Property Relationships Of Complex Gels With Physical And Chemical Crosslinking, Rosa Maria Badani Prado
Theses and Dissertations
Gels are used in many applications ranging from bioengineering and pharmaceuticals to food technology and soft-robotics because of their tunable physical and mechanical properties. In many of these applications, the materials need to sustain large deformation. The microstructure of gels changes significantly at large strain values, causing a deviation in the stress responses from that at low strain. The desired mechanical responses of gels can be obtained by tuning their microstructure, therefore, the structure-property relationship for gels is required to be understood for their practical applications. This dissertation discusses two types of gels, one consists of chemical crosslinking and hydrophobic …
A Probabilistic Approach To Levee Overtopping Risk Assessment, Stefan G. Flynn
A Probabilistic Approach To Levee Overtopping Risk Assessment, Stefan G. Flynn
Theses and Dissertations
The most common mode of levee failure, breach due to overtopping, is generally considered as a function of a complex set of contributing factors. The goal of this research is to enhance the state of the art and practice for performing levee overtopping risk assessment. For this purpose, a dataset of levee overtopping event records within the portfolio of levee systems maintained by the U.S. Army Corps of Engineers (USACE) is presented. The dataset is utilized with logistic regression analysis to develop a probabilistic model to calculate system response probabilities and assess risk related to levee overtopping. The presented dataset …
Elements: A Unified Framework For Supporting Low And High Order Numerical Methods For Multi-Physics Material Dynamics Simulations, Jacob Moore
Theses and Dissertations
Many complexities arise when writing software for computational physics. The choice of underlying data structures, physics model representation, and numerical methods used for the solver all add to the overall complexity of a code and significantly affect the simulation speed and accuracy of the solution. This work has integrated multiple recently developed software tools into a unified framework called ELEMENTS. ELEMENTS contains tools to address the complexities of data representation and numerical methods implementation for computational physics applications. ELEMENTS consists of multiple software packages: Elements, MATAR, Swage, Geometry, and SLAM. MATAR is a performance portability and productivity implementation of data-oriented …
Additive Manufacturing Supply Chain Design And Modeling Using Customer Product Choices: An Application With Biomedical Implants, Julekha Hussain Ranta
Additive Manufacturing Supply Chain Design And Modeling Using Customer Product Choices: An Application With Biomedical Implants, Julekha Hussain Ranta
Theses and Dissertations
This study proposed a utility-driven two-stage stochastic mixed-integer linear programming model to understand how the patient preferences impact the additive manufacturing (AM) supply chain design decisions. The goal of the mathematical model is to maximize the utilities derived from the customer preferences by appropriately allocating the AM facilities in the targeted region under customer decision and demand uncertainty. The mathematical model is visualized and validated by developing a real-life case study that utilizes the biomedical implants data for the state of Mississippi. A number of sensitivity analyses are conducted to understand how the patients' behavioral decisions (e.g., price-centric versus time- …
The Effects Of Sildenafil On Portal Vein Velocity, Cross-Sectional Area, And Congestion Index In The Dog, Christopher Tollefson
The Effects Of Sildenafil On Portal Vein Velocity, Cross-Sectional Area, And Congestion Index In The Dog, Christopher Tollefson
Theses and Dissertations
The main use of sildenafil in human medicine is to treat erectile dysfunction. In veterinary medicine, sildenafil is most frequently used to treat pulmonary hypertension. The effects of sildenafil on the portal vasculature in the dog have not been previously evaluated. The purpose of this study was to evaluate the effects sildenafil has on the portal vasculature. The cross-sectional area of the aorta, cross-sectional area of the portal vein, and portal vein velocity were acquired in thirteen dogs prior to administration, 45 minutes, 90 minutes, and 120 minutes after the oral administration of sildenafil for the treatment of pulmonary hypertension. …
Evaluating The Effectiveness Of Behavioral Skills Training For Teaching Cpr And First Aid Skills To Young Adults With Intellectual Disabilities., Aaron White
Theses and Dissertations
Several researchers have suggested that safety skill instruction has been neglected amongst individuals with intellectual disabilities even though injuries occur at an exceedingly higher rate than the general population. The purpose of the study was to evaluate the effectiveness, generality, and maintenance of the use of behavior skills training to teach 6 CPR and first aid target skills to young adults with intellectual disabilities. Overall, the current study's results suggest that an intervention package using instruction, modeling, rehearsal, and feedback was effective in teaching CPR and first aid skills as well as generalizing across instructors. Additionally, the current study suggests …
U.S. Consumer Preferences For Blockchain-Based Traceability Of Leafy Greens, Ajita Giri
U.S. Consumer Preferences For Blockchain-Based Traceability Of Leafy Greens, Ajita Giri
Theses and Dissertations
High-profile outbreaks in the U.S. have been increasingly linked to the consumption of leafy greens (Xue et al. 2007), making traceability an important issue (Corkery and Popper 2018). Consumers' increasing attention to traceability (Hansstein 2014) has led to the implementation of blockchain-based traceability systems. This study measures U.S. consumers' willingness-to-pay (WTP) for blockchain-based traceability information in packages of romaine lettuce and spinach. We conduct two online Discrete Choice Experiments (DCEs) and surveys to understand consumer preferences for USDA-certified organic leafy greens, access to blockchain-based traceability information via QR codes, and the FDA's voluntary labeling guidelines involving growing region information. Our …
Evaluating The Influence Of Ecosystem Characteristics And Species Traits On Exotic Species Distributions, Adrián Lázaro-Lobo
Evaluating The Influence Of Ecosystem Characteristics And Species Traits On Exotic Species Distributions, Adrián Lázaro-Lobo
Theses and Dissertations
Natural dispersal mechanisms and biogeographical barriers have shaped species' native distributional ranges over millions of years. However, over the last few centuries, humans have dispersed species beyond their natural ranges. Those species that undergo explosive population growth and rapid expansion in the introduced region are considered as invasive because they have the potential to cause negative effects on desirable species and/or ecosystem services. In chapter II, I identified what ecosystem characteristics are more closely associated with successful establishment of exotic and native species, to have a better idea of where to concentrate our efforts and resources to prevent invasion events …
Religious-Based Programming And Reentry Success: An Examination Of Spirituality And Its Effects On Post-Release Engagement, Employment, And Recidivism, Allie C. Bosi
Theses and Dissertations
This study uses data from HopeWorks, a Christian, faith-based vocational program inside the Shelby County Division of Corrections in Memphis, Tennessee, to examine factors affecting reentry success. Specifically, this research examines how spirituality - using measures that assess both spirituality (measured at the end of the program) and change in spirituality (measured as the difference between pre- and post-program measures of spirituality) - affects released offenders' reengagement with the program, ability to obtain employment, and ability to refrain from reoffending.
The Nose Glows: Investigating Amphibian Neuroendocrine Pathways With Quantum Dots, Allison Rebecca Julien
The Nose Glows: Investigating Amphibian Neuroendocrine Pathways With Quantum Dots, Allison Rebecca Julien
Theses and Dissertations
Today, amphibian extinction rates are rising at an alarming rate. Captive assurance colonies have become a hedge against extinction, and often must employ assisted reproductive technologies (ART) in species that do not readily breed in captivity. One technique that can be utilized in assisted breeding is hormone therapy, which involves the treatment of individuals with exogenous reproductive hormones. The primary delivery method used in most breeding programs is intraperitoneal injection, but many institutions either lack the training necessary to conduct this invasive procedure, or require veterinary staff to perform them, thus delaying breeding events. Therefore, there is interest in alternate …
Distribution And Direct Impacts Of Marine Debris On The Mississippi Commercial Shrimping, Alyssa Rodolfich
Distribution And Direct Impacts Of Marine Debris On The Mississippi Commercial Shrimping, Alyssa Rodolfich
Theses and Dissertations
Commercial shrimpers in the Mississippi Sound frequently encounter marine debris in their nets, which results in loss of time, loss of catch, and added repair costs. Yet, the spatial and temporal distribution of this marine debris and the economic impact faced by shrimpers in the Mississippi Sound is not well known. This study measured the quantity and economic impact of marine debris by surveying 20 commercial shrimpers. Participants logged marine debris encounters, fishing data, and damage to fishing gear during the July 2020 through December 2020 shrimping season. It was found that shrimpers encounter marine debris 19% of all tows, …
Determining The Optimal Dile:Dlys Ratio For Ross 708 X Ross Yp Male Broilers Throughout Multiple Grow Out Phases (Starter, Grower, And Finisher), Andrew Taylor Brown
Determining The Optimal Dile:Dlys Ratio For Ross 708 X Ross Yp Male Broilers Throughout Multiple Grow Out Phases (Starter, Grower, And Finisher), Andrew Taylor Brown
Theses and Dissertations
Within commercial broiler production, feed and feed manufacturing costs account for 60 to 70% of production costs. Of these feed costs specifically, ingredients that supply energy and protein represent the highest expenditure, verifying the importance of knowing the nutrient requirements of current broiler strains to ensure accurate least-cost formulation. To reduce these production costs and optimize performance, primary breeder companies and nutritionists continuously strive to improve nutrient utilization of commercial broiler strains. As a result of this, a great magnitude of work is conducted to determine the nutrient requirements for broilers, especially amino acids. Therefore, the overall objective of this …
The Effects Of Developmental Chlorpyrifos Exposure On The Proteome Of The Adolescent Rat Hippocampus, Aubrey Lewis
The Effects Of Developmental Chlorpyrifos Exposure On The Proteome Of The Adolescent Rat Hippocampus, Aubrey Lewis
Theses and Dissertations
Chlorpyrifos is a widely used organophosphate insecticide, functioning through the inhibition of acetylcholinesterase. Recent studies report negative long-lasting biochemical and behavioral effects at levels without acetylcholinesterase inhibition. Our lab studies have identified the endocannabinoid system as a target for OP low-dose neurotoxicity. This thesis identifies the proteins and their associated neurotransmitter systems in the hippocampus that have been affected by low dose developmental exposure to the OP insecticide CPF. Male rat pups were treated from postnatal day 10 (PND) - PND16 with either corn oil (vehicle), 0.75 mg/kg of CPF, or 0.02 mg/kg of PF-04457845, a specific fatty acid amide …
Modeling Recombination Rate As A Quantitative Trait Reveals New Insight Into Selection In Humans, Austin L. Drury
Modeling Recombination Rate As A Quantitative Trait Reveals New Insight Into Selection In Humans, Austin L. Drury
Theses and Dissertations
Meiotic recombination is both a fundamental biological process required for proper chromosomal segregation during meiosis and a fundamental genomic parameter that shapes major features of the genomic landscape. While there is strong evidence of fitness costs of low rates of recombination, the possible fitness costs of high rates of recombination are less defined. To determine whether a single lower fitness bound can explain the variation in recombination rate observed in human populations, we simulated the evolution of recombination rate as a quantitative trait using empirically-derived parameters. For our fitness function, we implemented a hyperbolic tangent curve with flexible parameters to …
Application Of Laser-Induced Breakdown Spectroscopy (Libs) To The Expansion Of Strontium (Sr) Analysis Options And To Used Engine Oil, Ayed M. Binzowaimil
Application Of Laser-Induced Breakdown Spectroscopy (Libs) To The Expansion Of Strontium (Sr) Analysis Options And To Used Engine Oil, Ayed M. Binzowaimil
Theses and Dissertations
Laser-induced breakdown spectroscopy (LIBS) is a technique that allows quantitative and qualitative analysis of many materials. In this study, the LIBS analysis options for strontium mixture powders is expanded by increasing the number of usable strontium atomic transitions to avoid incorrect results due to spectral congestion or high strontium concentrations. The research employs double-sided tape affixed to a glass slide to hold the sample where the powder is poured onto one surface of the tape and excess dust that has not adhered is removed. This method minimizes the sample quantity needed and keeps the sample on the slide during experimentation, …
Effects Of The In Ovo Injection And Dietary Supplementation Of L-Ascorbic Acid On The Performance, Tissue L-Ascorbic Acid Concentrations, Inflammatory Response, And Trachea Histomorphology Of Ross 708 Broilers Raised Under Normal And Elevated Atmospheric Ammonia Levels, Ayoub Mousstaaid
Theses and Dissertations
Effects of various levels of L-ascorbic acid (L-AA) (12 and 25 mg) in ovo injected at 17 and 18 days of incubation, on embryonic and posthatch physiological variables in Ross 708 broilers were investigated. There were no significant treatment effects on the hatchability or serum concentrations of L-AA in the broilers. Eye L-AA concentrations were higher, and plasma nitric oxide levels were lower in male chicks treated in ovo with 12 mg of L-AA. While exposed to elevated atmospheric NH3 levels, the in ovo injection of 12 mg of L-AA increased the body weight gain and decreased the feed conversion …