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Articles 153151 - 153180 of 5157584
Full-Text Articles in Entire DC Network
Finite Element Modeling Of Plasma Membrane Injury From Mechanical Stress: A Combined Finite Element And Machine Learning Approach, Eric Flynn Mabowitz
Finite Element Modeling Of Plasma Membrane Injury From Mechanical Stress: A Combined Finite Element And Machine Learning Approach, Eric Flynn Mabowitz
Theses and Dissertations
Low back pain is a leading cause of disability across a wide range of occupations and environments. Exposure to whole-body vibration (WBV) has been linked to an increased prevalence of low back pain, as well as certain neurophysiological complications. While current understanding of WBV effects is largely based on tissue- and whole-body-level studies, a significant gap remains in knowledge regarding how vibrational forces propagate through individual cells. This knowledge gap limits a comprehensive understanding of how these forces affect the human body at the microscopic level. To address this, the present study employs both two-dimensional (2D) and three-dimensional (3D) finite …
Older Adult Men’S Well-Being: The Impact Of Masculinity And Negative Perceptions Of Aging, Darby D. Mackenstadt
Older Adult Men’S Well-Being: The Impact Of Masculinity And Negative Perceptions Of Aging, Darby D. Mackenstadt
Theses and Dissertations
Stereotype embodiment theory states that individuals who hold negative aging stereotypes may internalize them, and thus view their own aging process as negative. This study aimed to evaluate how older adult men may be influenced by their adherence to masculinity standards, such as men are expected to be strong and independent, in older adulthood. A sample of 438 men aged 55 and older living in the southern United States was analyzed, finding that beliefs of masculinity moderated the relationship between negative perceptions of aging and depression. Participants who reported a high adherence to masculinity beliefs and a negative perception of …
Exploring The Use Of A Random Forest In Correcting Gfs Tropical Cyclone Landfall Errors, Victoria Grace Maxwell
Exploring The Use Of A Random Forest In Correcting Gfs Tropical Cyclone Landfall Errors, Victoria Grace Maxwell
Theses and Dissertations
While Tropical Cyclone (TC) track forecasting has improved over the years it has been slow. These improvements can be attributed to increased computer capability and better model inputs. Machine learning has been used for forecasting different TC track and intensity. The study here looks to use a Random Forest to predict the TC latitude/longitude “landfall” at 72-hr and quantify improvements to the GFS forecast. Principal Component Analysis was used to reduce the dimensionality of the meteorological variables. Stepwise regression was used to determine the principal components that were important for forecasting landfall. These variables were then tested with a multivariate …
Synthetic Mrna Induced Tf1.17-Specific Antibody Response Against Tritrichomonas Foetus For Preputial Delivery In Bulls, Kenzie Mcatee
Synthetic Mrna Induced Tf1.17-Specific Antibody Response Against Tritrichomonas Foetus For Preputial Delivery In Bulls, Kenzie Mcatee
Theses and Dissertations
Bovine trichomoniasis, caused by Tritrichomonas foetus, remains a persistent reproductive disease in cattle due to asymptomatic carriage in bulls and lack of effective treatments. This thesis evaluated the use of synthetic mRNA to drive expression of TF1.17- specific antibodies, targeting a conserved surface adhesin essential for parasite colonization. Membrane-anchored and secreted IgG1 constructs were transfected into bovine kidney cells, resulting in time-dependent antibody expression verified via NanoLuc luminescence. In vivo, aerosolized mRNA administration to bull calves led to localized antibody expression in preputial secretions. Although immunofluorescence assays detected fluorescence signal, high background limited interpretation of specific binding to T. foetus. …
Evaluating The Dietary Supplementation Of Soy Lecithin For Channel Catfish (Ictalurus Punctatus), Crystal Lodi Conde
Evaluating The Dietary Supplementation Of Soy Lecithin For Channel Catfish (Ictalurus Punctatus), Crystal Lodi Conde
Theses and Dissertations
Soy lecithin (SL), a phospholipid rich ingredient derived from soybeans, was tested to evaluate the effects on channel catfish growth and physiological responses. In Trial 1, formulated diets with gradual SL levels were tested. Fish fed 1.5% SL had improved feed efficiency, while 0.5% SL enhanced protein conversion efficiency. The SL influenced cortisol levels during recovery from air exposure stress and improved survival after bacterial challenge. The Trial 2 tested three different lipid sources: Soybean oil (SBO; control), 1% SL + SBO, and catfish oil (CFO). The SL-fed fish also presented improved feed efficiency compared to the SBO group. There …
Transforming Movement Assessment In Physical Therapy Through Subaquatic Data Collection, Kaitlyn Mcdonald
Transforming Movement Assessment In Physical Therapy Through Subaquatic Data Collection, Kaitlyn Mcdonald
Theses and Dissertations
This study explored the interest and perceived barriers to integrating subaquatic diagnostic technologies (SDTs) into hydrotherapy among licensed physical therapists. Seventeen semi-structured interviews were conducted using a mixed-methods design, with 15 interviews included in the final analysis. Quantitative data were analyzed using chi-square tests, while qualitative responses were coded thematically. Results indicated no statistically significant relationships between SDT interest and career stage or hydrotherapy access, though qualitative data highlighted concerns about cost, limited access, and usability. Despite mixed interest in adoption, participants identified several potential benefits of SDTs, including improved treatment tailoring, increased patient buy-in, and enhanced outcome monitoring. Functional …
Family Matters: How Caregiver Influence And Internal Locus Of Control Relate To Academics, Maia Mclin
Family Matters: How Caregiver Influence And Internal Locus Of Control Relate To Academics, Maia Mclin
Theses and Dissertations
Academics in college predicts life outcomes; students from lower socioeconomic status (SES) backgrounds often face greater challenges. One such population, consisting of many individuals from marginalized backgrounds, are those raised by nontraditional parents. This study investigated predictors of academics among 357 college students, examining authoritative parenting style, intrinsic motivation, academic locus of control (LoC), SES, and caregiver type (parental vs. non-traditional). Academics was assessed using two composite scores: 'academic knowledge' (GPA/ACT) and 'compensatory attention' (working memory via n-back task accuracy and attention/concentration via SMALSI-C). Hierarchical regressions revealed that higher authoritative parenting, higher SES, and being raised by biological parents significantly …
Native Bee Communities Within Restored Montane Longleaf Pine Ecosystems, Mary Mcteague
Native Bee Communities Within Restored Montane Longleaf Pine Ecosystems, Mary Mcteague
Theses and Dissertations
Montane longleaf pine ecosystems are remarkably biodiverse and highly understudied. Like other longleaf pine ecosystems, montane longleaf pine forests have faced declines. These ecosystems have been undergoing restoration efforts to reestablish floral understories. Flourishing pollinator communities are essential to successful restoration efforts. This study seeks to understand the influence of site history and characteristics on native bee communities in restored montane longleaf pine ecosystems, and to establish a methodology for creating pollination networks in these ecosystems by using DNA metabarcoding to analyze bee-collected pollen. Our results showed that community composition varied based on month and site history. Site history impacted …
Investigation Of Guayule Resin As An Oil-Based Wood Treatment, Jordan Miller
Investigation Of Guayule Resin As An Oil-Based Wood Treatment, Jordan Miller
Theses and Dissertations
Development of alternative treatments for wood product protection is an ongoing focus throughout the wood products industries. All manufacturers hope to increase the use life of their products, while ensuring that their products do not have a harmful impact on their surrounding environment. One way of approaching this is to source potential components from other agricultural sources. Guayule resin is produced as a by-product of rubber extraction from the guayule plant (Parthenium argentatum). The resin has been reported to have insecticidal and microbial properties, but there are numerous problems with utilization, including how to extract it and apply it due …
Sweetpotato Insect Pests: Virus Vector Management And Rearing, Rachel Emily Morrison
Sweetpotato Insect Pests: Virus Vector Management And Rearing, Rachel Emily Morrison
Theses and Dissertations
Sweetpotatoes (Ipomoea batatas) are vegetatively propagated through slips, making them prone to viral buildup. Aphids are insect pests known for transmitting viruses to crops, which reduces yield. This study examined different options for aphid management to reduce the spread of potyviruses: crop borders, crop oils, and insecticides. However, the results of this research showed that treatments were not successful at reducing the spread of the four potyviruses tested. An additional objective was to establish a colony of banded cucumber beetles (Diabrotica balteata) in the laboratory. These beetles are a leaf-feeding and root-feeding pest of sweet potatoes. Two colonies of banded …
Expanding Access: A College Access Model For English Learners, Amanda Blackwell Mcleod
Expanding Access: A College Access Model For English Learners, Amanda Blackwell Mcleod
Theses and Dissertations
As one of the fastest-growing student populations in K -12 schools, English Learners (EL)s remain significantly underrepresented in postsecondary education. Barriers such as academic preparedness, financial constraints, and sociocultural factors hinder their access to postsecondary education. However, by developing targeted strategies to assist ELs in accessing and completing college, institutions can address these challenges and ensure a more diverse and sustainable student body in the face of declining enrollment. Effective models for helping EL students access college include family engagement, early college exposure, peer mentorship, and student-centered advising. By assisting ELs in accessing college, institutions can strengthen their enrollment efforts, …
Spatial Variability Of Heat Mortality Rate Relationships In Arizona At Primary Care Area Level, Ria Mukherjee
Spatial Variability Of Heat Mortality Rate Relationships In Arizona At Primary Care Area Level, Ria Mukherjee
Theses and Dissertations
Heat Mortality Rates (HMR) in Arizona (AZ) are one of the highest in all of US. The HMR association with environmental, socioeconomic, demographic, and occupational factors has been widely investigated to inform mitigative policy. This study employed linear and spatial models- Ordinary Least Square (OLS), Geographically Weighted Regression (GWR) and multiscale Geographically Weighted Regression (MGWR), across AZ at Primary Care Area (PCAr) level to identify important spatial trends in HMR relationship. Results indicated a significant global association between heat mortality and environmental variables and the elderly population aged 65 and older. In contrast, the working age group between 54 and …
The Role Of Community Preparedness In Influencing Migration After Natural Disasters, Caren Mwange
The Role Of Community Preparedness In Influencing Migration After Natural Disasters, Caren Mwange
Theses and Dissertations
Natural disasters like hurricanes have become more costly over the years; therefore, it is crucial to understand how to mitigate the effects of natural disasters and make communities resilient. Migration responses often reflect the resilience of communities to shocks. However, the extent to which community preparedness influences migration remains underexplored. This study investigates the role of community preparedness in influencing migration after Hurricane Harvey, which struck Louisiana and Texas in 2017. A Difference-in-Differences methodology is used to assess whether community preparedness influenced migration following Hurricane Harvey. Migration is influenced by Hurricane Harvey, but certain community preparedness measures reduce the decline …
Unboxing The Black Box: Graph-Based Interpretability In Transformer Models, Ramak Nassiri
Unboxing The Black Box: Graph-Based Interpretability In Transformer Models, Ramak Nassiri
Theses and Dissertations
This thesis introduces a novel interpretability framework for transformer encoder models by hypothesizing that their internal embedding updates define a state transition system. We propose that transformers implicitly learn token-to-token influence dynamics, which can be analyzed using graph-theoretic methods. To validate this, we construct transition graphs from embedding changes and rank token importance using the PageRank algorithm. We develop two transformer models from scratch: a self-supervised model that incorporates serotype tokens to learn contextualized embeddings, and a supervised model initialized with these embeddings. Cosine similarity analysis of their token influence patterns reveals strong structural alignment, with values exceeding 93%. This …
Evaluating The Impacts Of Cover Crops At Different Nitrogen Rates On Soil Microbial Dynamics Within A Sweetpotato Production System, Lahari Nekkalapudi
Evaluating The Impacts Of Cover Crops At Different Nitrogen Rates On Soil Microbial Dynamics Within A Sweetpotato Production System, Lahari Nekkalapudi
Theses and Dissertations
A field study was conducted from 2023 to 2024 at Pontotoc, Mississippi, to evaluate the effects of cover crops and nitrogen (N) fertilizer on soil microbial communities in sweet potato production. The study followed a randomized split-block design with three cover crops (Clover, Wheat, and Fallow) and three N rates (0, 50, and 100 lb N acre⁻¹), each replicated four times. Soil samples were collected at cover crop termination, sweet potato planting, and harvest. Bacterial and fungal communities were analyzed using Illumina HiSeq sequencing. Soil properties such as total carbon, total nitrogen, pH, POXC, and microbial activity (AWCD) were also …
Augmenting Healthcare Communication: Context-Aware Ai Frameworks For Clinical Decision Support And Automated Summarization, Subash Neupane
Augmenting Healthcare Communication: Context-Aware Ai Frameworks For Clinical Decision Support And Automated Summarization, Subash Neupane
Theses and Dissertations
Healthcare communication is plagued by fragmented medical knowledge, patient misunderstanding of care plans, and clinician burnout from documentation burdens. These inefficiencies cost the U.S. healthcare system over $300 billion annually due to preventable nonadherence and administrative waste [47, 19]. While Artificial Intelligence (AI) technology like Large Language Models (LLMs) offer potential solutions, existing systems fail to deliver personalized, context-aware guidance or automate documentation without sacrificing accuracy. This dissertation addresses these gaps through three novel context-aware AI frameworks such as MedInsight, ClinicSum, and ClinicDuo. MedInsight leverages a multi-source context augmentation approach to synthesize patient centric medical responses by integrating Electronic Health …
Spawning And Rearing Techniques For Improved Production Of White Crappie (Pomoxis Anularis), Matthew E. Nichols
Spawning And Rearing Techniques For Improved Production Of White Crappie (Pomoxis Anularis), Matthew E. Nichols
Theses and Dissertations
White Crappie (Pomoxis annularis) is a popular species, commonly propagated in hatcheries to support fisheries and supplement natural populations during cyclical declines. However, limited information exists regarding the effects of extended broodstock holding periods (>4 weeks), which are critical for enhancing flexibility in hatchery practices. Furthermore, rearing larval-to-juvenile crappie in outdoor ponds would greatly benefit from optimized fertilization and stocking densities to improve growth and survival rates. Additionally, dietary preferences during early life stages remain poorly understood, yet are essential for maximizing production efficiency. This study found holding broodstock for > 6 weeks can significantly reduce fertilization percentages. We also …
Decision-Making And Execution Skill Estimation In Continuous Action Space Domains, Delma I. Nieves-Rivera
Decision-Making And Execution Skill Estimation In Continuous Action Space Domains, Delma I. Nieves-Rivera
Theses and Dissertations
In many real-world domains with continuous action spaces, an agent’s performance is driven by two key factors: its decision-making skill, or ability to select high-quality actions, and its execution skill, or precision in carrying out these actions. However, accurately evaluating these skills, particularly when direct information about the agent’s intentions is unavailable, remains a challenging problem. This research addresses this need by developing a theoretical framework and proposing novel estimation methods to assess both decision-making and execution skills based solely on observable data: executed actions and their associated rewards. The work consists of six core studies focused on developing and …
Markov Chain Monte Carlo Techniques– Innovations In Lifetime Data Analysis And Missing Value Imputations, Tobias Omondi Oketch
Markov Chain Monte Carlo Techniques– Innovations In Lifetime Data Analysis And Missing Value Imputations, Tobias Omondi Oketch
Theses and Dissertations
This dissertation develops scalable Bayesian solutions for two critical challenges in modern data analysis: modeling failure times and imputing missing biological data. First, we introduce an adaptive semi-parametric MCMC framework for Weibull lifetime modeling, addressing the lack of conjugate priors and multidimensional sufficient statistics. Using hierarchical modeling and the No-U-Turn Sampler (NUTS) in STAN, we evaluate 24 prior combinations across 72 simulated datasets. The method yields robust parameter estimates under increasing and decreasing hazard rates and proves effective in predicting prostate cancer patient survival. Second, we assess imputation strategies for high-throughput proteomics data, where missingness distorts signal integrity. We compare …
Motivating Factors Leading To Job Satisfaction Of Teacher Assistants And Their Perceptions Of Such, Jon Oswalt
Motivating Factors Leading To Job Satisfaction Of Teacher Assistants And Their Perceptions Of Such, Jon Oswalt
Theses and Dissertations
This research study investigated the role perceptions, motivating factors, and perceptions of job satisfaction from the perspective of elementary teacher assistants. While key in the field of education, research focused on the position of teacher assistant is lacking, suggesting the need for a critical view of the role. A qualitative study was designed to examine the key components of the perceptions of job satisfaction, the motivating factors leading to it, and the perceptions of the position through the lens of the teacher assistant. Five elementary teacher assistants from a single school in a southern state participated in semi-structured interviews. Key …
An Evaluation Of The Mississippi 4-H/Ffa Replacement Beef Heifer Development Contest, Lindsey V. Pansano
An Evaluation Of The Mississippi 4-H/Ffa Replacement Beef Heifer Development Contest, Lindsey V. Pansano
Theses and Dissertations
The Mississippi 4-H/FFA Replacement Beef Heifer Development Contest began in 2008 to provide youth with a contest to showcase their managerial skills relating to beef cattle. This study examined the impact of contest participation on development of life skills, technical skills, and choice of occupation. Youth and parents/guardians reported slight to moderate improvement in life skills. The same groups also agreed that technical skills were improved through contest participation. While most youth did not consider the contest to impact their choice of occupation, all indicated that they are currently involved in the beef cattle industry as adults. Overall, these results …
Timber Price Trends, Transmission, And The Impact On Loblolly Pine Plantation Management In The United States South., Samjhana Panthi
Timber Price Trends, Transmission, And The Impact On Loblolly Pine Plantation Management In The United States South., Samjhana Panthi
Theses and Dissertations
This study analyzed the impact of pine timber price trends on optimal rotation age and price transmission relationship in the timber market in the US South. Price trends and volatilities were incorporated into discounted cash flow analyses to determine stochastic optimal rotation age. The results revealed that negative price trends reduced the optimal rotation age and maximum land expectation values compared with the base case of the Faustmann model's constant timber prices. Also, I performed a vertical price transmission study for the US South pine timber market using a Smooth Transition Autoregressive (STAR) model. Price transmission was linear in the …
Developing Site Index Curves And Exploring Growth Efficiency Variation In Longleaf Pine Planted On Marginal Agricultural Land In Georgia, Usa, Jabryan Pegues
Developing Site Index Curves And Exploring Growth Efficiency Variation In Longleaf Pine Planted On Marginal Agricultural Land In Georgia, Usa, Jabryan Pegues
Theses and Dissertations
With the relative success of the Conservation Reserve Program (CRP), there is a considerable amount of longleaf pine (Pinus palustris Mill.) trees planted on marginal agricultural land, with little to no guides for productivity management. This study was conducted in four distinct age classes of longleaf pine plantations at The Jones Center at Ichauway in Southwest Georgia, USA. Most of these stands were commercially thinned in 2014 and some were impacted by Hurricane Michael in 2018. I developed site index equations to represent growth trajectories of these stands while incorporating growth starting from ground level. Additionally, the concept of tree-level …
A Mathematical Theory Of Epitaxial Growth, Brock C. Price
A Mathematical Theory Of Epitaxial Growth, Brock C. Price
Theses and Dissertations
In this dissertation we investigate several PDE models of Epitaxial growth. These models are fourth-order PDE’s featuring exponential nonlinearities as well the p-Laplacian and 1-Laplacian. The presence of the exponential nonlinearity is what provides the main mathematical difficulty. Theexponent in particular does not have enough estimates to guarantee any compactness. Because of this, one has to allow the inclusion of a singular portion to the exponent in the sense of the Lebesgue decomposition theorem. In thefirst chapter weinvestigate a related epitaxial growth, with transition rates of the Metropo lis variety and a linear exponent. The metropolis rates induce an extra …
Drought Resilience Of Cowpea During Vegetative And Reproductive Stages, Sujan Poudel
Drought Resilience Of Cowpea During Vegetative And Reproductive Stages, Sujan Poudel
Theses and Dissertations
Cowpea (Vigna unguiculata (L.) Walp.) is an important leguminous crop. Exposure to drought can lead to significant reductions in yield and quality. Designing strategies to mitigate the effects of drought requires a comprehensive understanding of how trait variability influences resilience at various crop growth stages. Three experiments were conducted to assess the response and resilience of various cowpea genotypes under control (100% irrigation) and drought (50% irrigation of control for 14 days) conditions during the vegetative (nodulation initiation - V2, and peak branching - V4) and reproductive (flowering - R1, and seed fill - R4) stages. The short-term drought impacted …
Impact Of Overseeding Cover Crops On Dryland Soybeans In Mississippi Delta, Michael C. Pruden
Impact Of Overseeding Cover Crops On Dryland Soybeans In Mississippi Delta, Michael C. Pruden
Theses and Dissertations
In the Mississippi Delta, continuous dryland soybean (Glycine max L.) production practice is a selection for those that do not or cannot irrigate their crops. However, no crop rotation results in yield losses due to diseases, increased insect population, weed species pressure, nutrient leaching, and soil erosion. Incorporation of cover crops might offer potential benefits but needs further investigation. The objectives were to determine the optimum cover crop planting time (R6 and harvest) and ideal cover crop species, and evaluate their impact on dryland soybean grain yield, quality, and plant population. R6 overseeded cereal rye (Secale cereale L.) produced the …
Neural Architecture Search-Driven Unsupervised Domain Adaptation For Enhanced Wood Chip Quality Evaluation In Forest Industries, Abdur Rahman
Theses and Dissertations
Reliable and efficient measurement of wood chip moisture content is crucial for forest-reliant industries, including biofuel production, pulp and paper manufacturing, and bio-refineries, as it directly influences product quality and energy output. Traditional methods like the oven-drying technique, despite their widespread use, are time-consuming and impractical for real-time applications, while modern alternatives such as NIR spectroscopy, electrical capacitance, and microwave analysis are often costly, less portable, and require specialized expertise. This dissertation addresses these limitations by leveraging deep learning and machine vision to develop a scalable, accurate, and portable method for moisture content measurement using RGB images of wood chips. …
Unraveling Quantum Properties Of Novel Two-Dimensional Systems Using A First-Principles Approach, Binod Regmi
Unraveling Quantum Properties Of Novel Two-Dimensional Systems Using A First-Principles Approach, Binod Regmi
Theses and Dissertations
We used first-principles density functional theory (DFT) to investigate the structural, electronic, and magnetic properties of an oxygen crystal in a copper slab, a ferrimagnetic electride with highly tunable magnetic anisotropy energy (MAE), and the Fermi surface analysis of different kagome metal phases. The Perdew-Burke-Ernzerhof (PBE) exchange-correlation functional was used in the Vienna ab initio simulation package (VASP) for all these calculations. Because of dimensionality reduction, the electronic properties of copper change significantly at the two-dimensional (2D) scale due to whichwe observe more reconstruction in the geometry of the Fermi surface. Dimensionality reduction also influences charge transport. Moreover, we present …
Evaluation Of Soil Steaming, Cover Crops, And Allelopathy: An Integrated And Sustainable Weed Management Strategy In Sweetpotatoes, Alaina Marie Richardson
Evaluation Of Soil Steaming, Cover Crops, And Allelopathy: An Integrated And Sustainable Weed Management Strategy In Sweetpotatoes, Alaina Marie Richardson
Theses and Dissertations
Yellow nutsedge (Cyperus esculentus L.) is a persistent weed in sweetpotato and vegetable cropping systems caused by its aggressive growth habit and limited control options. The present study assessed two alternative, chemical-free methods: steaming the soil and the use of allelopathic cover crops. Greenhouse and field experiments showed that steaming suppressed the germination of yellow nutsedge effectively and that treatments for 45 min provided the highest control of all the soil depths tested (100%). A leachate experiment examined the allelopathy of five cover crops against yellow nutsedge and showed that buckwheat and cereal rye had the largest reductions in shoot …
Feed-Based Strategies To Improve Poultry Production Efficiency, Anna Kathryn Riggs
Feed-Based Strategies To Improve Poultry Production Efficiency, Anna Kathryn Riggs
Theses and Dissertations
The poultry industry continues to make significant strides in efficiency and innovation, particularly through advancements in nutrition. This thesis explores two key areas within broiler nutrition that are essential to supporting sustainable, cost-effective poultry production. First, the potential of a next-generation exogenous carbohydrase enzyme blend containing beta-mannanase and endo-glucanase is investigated when supplemented into reduced-energy, all-vegetable diets based on corn, soybean meal, and corn distillers dried grains with solubles in male broilers over a 42-day grow-out period, including processing (Chapter II). Second, the thesis examines the use of modeling strategies such as cubic, quadratic, kernel and smoothing spline to predict …