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Articles 5161 - 5190 of 74096
Full-Text Articles in Entire DC Network
Performance Evaluation Of Deep Learning Object Detectors For Weed Detection And Real Time Deployment In Cotton Fields, Abdur Rahman
Performance Evaluation Of Deep Learning Object Detectors For Weed Detection And Real Time Deployment In Cotton Fields, Abdur Rahman
Theses and Dissertations
Effective weed control is crucial, especially for herbicide-resistant species. Machine vision technology, through weed detection and localization, can facilitate precise, species-specific treatments. Despite the challenges posed by unstructured field conditions and weed variability, deep learning (DL) algorithms show promise. This study evaluated thirteen DL-based weed detection models, including YOLOv5, RetinaNet, EfficientDet, Fast RCNN, and Faster RCNN, using pre-trained object detectors. RetinaNet (R101-FPN) achieved the highest accuracy with a mean average precision ([email protected]) of 79.98%, though it had longer inference times. YOLOv5n, with the fastest inference (17 ms on Google Colab) and only 1.8 million parameters, achieved a comparable 76.58% [email protected], …
Optimal Navigation, Control And Simulation Of Electrified And Unmanned Ground Vehicles With Bio-Inspired And Optimization Approaches, Amine Taoudi
Theses and Dissertations
In recent years, significant progress has been made in autonomous robotics and the electrification of transportation, highlighting the growing importance of automation in daily life. Ensuring the safety and sustainability of automated systems necessitates the integration of intelligent algorithms capable of making astute decisions in uncertain circumstances. Autonomous robots possess considerable potential for efficiently performing intricate tasks, but this potential can only be unlocked through intelligent algorithms. Moreover, enhancing the energy efficiency of transportation systems yields extensive benefits for the environment, economy, and society at large. Addressing the urgent challenges of climate change and resource depletion necessitates prioritizing energy efficiency …
Third-Grade Choctaw Students’ Perceptions Of An In-School Choctaw Language And Culture Program, Amy L. Pauls
Third-Grade Choctaw Students’ Perceptions Of An In-School Choctaw Language And Culture Program, Amy L. Pauls
Theses and Dissertations
In the United States, Indigenous language loss is the result of colonization and deliberate eradication by government policies. Many tribal communities engage in activities to curb language shift, including language reclamation or revitalization to restore the vitality of Indigenous languages. Schools for Indigenous children, once the setting for the destruction of their Indigenous identity and language, have increasingly become the medium for language reclamation. Numerous school-based programs have effectively renewed language use, including those in the Hawaiian, Yup’ik, and Navajo language communities (Holm & Holm, 1995; Wilson & Kamanā, 2011; Wyman et al., 2010). Though school-based programs may increase students’ …
Sexual Attitudes And Knowledge Of Southern United States College Students On Risky Sexual Behavior: Moderation By Conservative Religiosity, Sex, And Sexual Double Standards, Andreana Durham
Theses and Dissertations
The purpose of the current study was to examine the relation of sexual attitudes and knowledge on risky sexual behavior (RSB), while including sex, sexual double standards (SDS), and conservative religiosity as moderators. Findings suggested that sexual knowledge, sexual attitudes, and conservative religiosity associated negatively with RSB for female participants. SDS positively associated with RSB for male participants. The interaction of sexual knowledge and SDS on RSB was significant in male participants and indicated that higher sexual knowledge is associated with higher RSB when SDS is higher. The interaction of sexual knowledge and conservative religiosity on RSB was significant in …
Examination Of The Impact Of Discriminatory Legislation On Gender Minority Stress And Suicide Desire And Intent In Gender Minority Adults, Ashley R. Pate
Examination Of The Impact Of Discriminatory Legislation On Gender Minority Stress And Suicide Desire And Intent In Gender Minority Adults, Ashley R. Pate
Theses and Dissertations
Suicidal ideation and suicide attempt rates are far higher among gender minority individuals than in the general population. In the wake of an unprecedented number of anti-LGBTQ+ legislation being proposed and passed in 2023 in the United States, this study sought to examine the impact of this legislation on gender minority stress and suicidal desire and intent among gender minority adults. Results indicated that anxiety about the legislation was associated with the desire to die, perceived burdensomeness, thwarted belongingness, and the likelihood of attempting suicide in the future. The perceived impact of the legislation was associated with intent to die …
Efficacy Of Recycled Glass Cullet As A Soil Substrate For U.S. Gulf Coast Salt Marsh Restoration, Ansley Levine
Efficacy Of Recycled Glass Cullet As A Soil Substrate For U.S. Gulf Coast Salt Marsh Restoration, Ansley Levine
Theses and Dissertations
Recycled glass cullet is a potential alternative to fill substrate in salt marsh restoration projects, given its similarity to natural silica sands. However, the ability for common salt marsh plants to grow in glass cullet has not yet been tested. An outdoor mesocosm experiment assessed the ability of the dominant mid-marsh plant Juncus roemerianus and the upland marsh plant Spartina patens to grow in various mixtures of glass cullet versus fill soil. Results showed that J. roemerianus can survive in glass cullet, but growth declined as the proportion of cullet increased. However, S. patens grew comparably, if not better, in …
A Multivariate Analysis Of Coliform Microbial Dynamics And Intervention Efficacy In A Complex Ready-To-Eat (Rte) Beef Value Stream, Benjamin Adam Miles
A Multivariate Analysis Of Coliform Microbial Dynamics And Intervention Efficacy In A Complex Ready-To-Eat (Rte) Beef Value Stream, Benjamin Adam Miles
Theses and Dissertations
A complex multi-vector processed beef value stream was biomapped and work-in-process (WIP) was sampled at various processing points that affected the product microbiome. Coliform Petrifilm™ was used to analyze samples qualitatively and quantitatively across the meat and glaze vectors. There was an impact (p≤0.05) of the glaze distribution system on coliforms. The pumps of the glaze system were fully disassembled and additional microbial data were obtained through swabbing. WIP and sponge samples were subjected to 16S V1/V2 gene amplification with primers designed for taxonomic identification. Sequencing was conducted on the Illumina MiSeq platform and bioinformatics were developed in QIIME 2 …
Special Educators’ Attrition And Retention In The Post-Covid-19 Era: A Systematic Literature Review, Brandi J. Young Sumrall
Special Educators’ Attrition And Retention In The Post-Covid-19 Era: A Systematic Literature Review, Brandi J. Young Sumrall
Theses and Dissertations
Special education faces persistent challenges with teacher attrition and retention in the ever-changing landscape of education post COVID-19. Using empirical research and scholarly insights, this systematic review investigates the factors that influence whether special educators choose to continue or leave their jobs following the pandemic. Central to this investigation are the aspects that influence educators' career decisions pre pandemic, such as job satisfaction, working conditions, support systems and opportunities for professional growth. Through this exploration, we gain insights into the reasons why special education teachers choose to stay or leave their roles. The study emphasizes the pressing need to address …
The Loggerhead Sea Turtle Nesting Habitat Suitability Index Validation And Workflow Modernization For Habitat Monitoring And Coastal Management Best Practices, Brooke Marlo Walker
The Loggerhead Sea Turtle Nesting Habitat Suitability Index Validation And Workflow Modernization For Habitat Monitoring And Coastal Management Best Practices, Brooke Marlo Walker
Theses and Dissertations
The Caretta caretta, or Loggerhead sea turtle, is a protected species found across all temperate and subtropical oceans. Previous research has identified that the Caretta caretta has preferences for nesting sites based on beach width, beach slope, and vegetation coverage, which facilitated the development of a nesting site suitability index. In this thesis, these indices were integrated with standard coastal geomorphology metrics in the ESRI Suitability Modeler to pinpoint potential nesting locations for the C. caretta on various beach reaches. The results were then validated against observed nesting site data. The results of this study can inform critical decisions regarding …
Durability Of 34-Year-Old Preservative Treated Test Structures In Mississippi, Brianna A. Duquette
Durability Of 34-Year-Old Preservative Treated Test Structures In Mississippi, Brianna A. Duquette
Theses and Dissertations
Boron treated test houses at Mississippi State University’s Dorman Lake test site in Starkville, MS were built in 1989 to investigate the effectiveness of boron treatments with exposure to natural weathering. After being undisturbed for more than 20 years, samples were taken to evaluate the remaining levels of original treatments in the test houses. Visual evaluation of the test structures, curcumin test, and ICP-MS analysis of the borate content shows borates are a capable and effective long-term treatment for wood used in construction. No appreciable damage due to termite feeding was observed. Boron was still detectable by curcumin staining and …
Variational Quantum Algorithms For Two-Particle Systems, Cameron Moffat
Variational Quantum Algorithms For Two-Particle Systems, Cameron Moffat
Theses and Dissertations
This thesis explores variational quantum algorithms, a promising class of hybrid algorithms that leverage the variational principles to simulate quantum systems in the Noisy Intermediate-Scale Quantum (NISQ) era. We present a comparative analysis of two types of Variational Quantum Eigensolver (VQE) methods, assessing their capability to obtain the ground state of a two-particle fermionic quantum system. Also presented is our work using VQE to find ground states of a two-particle system with short-ranged interactions. Additionally, we studied variational quantum time evolution using the McLachlan variational principle, and compared the state evolution to the exact solution. Our findings highlight the strengths …
Residual Stress Predictions In L-Pbf Ti-6al-4v Nist Bridges Using Fem, Caitlin Delaney Luke
Residual Stress Predictions In L-Pbf Ti-6al-4v Nist Bridges Using Fem, Caitlin Delaney Luke
Theses and Dissertations
Finite element modeling (FEM) is used to predict complex phenomena like part deformation and the formation of residual strain resulting from cyclical heating. A gap exists in current literature using FEM to investigate the effect of printing strategies on strain and deformation in Ti-6Al-4V NIST bridges built by laser powder bed fusion (L-PBF). This study compares thermomechanical finite element models incorporating three scan strategies commonly used in literature: meander, stripe, and checkerboard, for the fabrication of Ti-6Al-4V NIST bridges using L-PBF. FEM of each scan strategy uses four mechanical material models: elastic perfectly plastic, Johnson-Cook, eigenstrain, and Hill 1948. The …
Evaluating The Use Of Soil Amendments For Shortleaf Pine (Pinus Echinata) Restoration On Post-Mined Landscapes, Casey Iwamoto
Evaluating The Use Of Soil Amendments For Shortleaf Pine (Pinus Echinata) Restoration On Post-Mined Landscapes, Casey Iwamoto
Theses and Dissertations
Coal strip mining leaves widespread degraded soil throughout the southeastern US. These soils tend to have low pH, high bulk density, impacted hydrologic processes, and an accumulation of heavy metals that limit revegetation and reforestation efforts. Shortleaf pine (Pinus echinata) can tolerate these poor conditions on post-mined sites and has the largest native pine range in the southeastern US, making it an ideal species for restoration efforts. Additionally, the use of soil amendments to improve soil physical and chemical parameters is expected to lead to improved plant establishment and growth. To address the challenges associated with degraded post-mined landscapes, two …
Ultrasonographic Appearance Of The Spleen Of Growing Kittens Using A High Frequency Linear Transducer, Catana M. Capps
Ultrasonographic Appearance Of The Spleen Of Growing Kittens Using A High Frequency Linear Transducer, Catana M. Capps
Theses and Dissertations
A reticulonodular splenic pattern is commonly associated with neoplastic or infectious etiologies. However, this has been described as an age-related variant in both humans and dogs, likely representing lymphoid follicles. The purpose of this study was to determine whether the ultrasonographic appearance of the spleens of growing kittens mimics the canine presentation. This was a prospective, descriptive study design. Healthy kittens up to 18 months old were scanned using a high frequency linear transducer. A reticulonodular pattern was present in (89%) of spleens. After 4 months of age, there was an overall negative correlation with age and the grade of …
Biomass Conversion Models For Selected Pines In The Southern United States, Chris Driskill
Biomass Conversion Models For Selected Pines In The Southern United States, Chris Driskill
Theses and Dissertations
Current carbon and bioenergy markets shifted the focus of typical forest attribute estimation from volume to biomass. We used multiple linear regression and the dataset collected as part of the National Scale Volume and Biomass modeling effort to develop biomass prediction models for Pinus taeda L., Pinus elliottii Engelm. var. elliottii, Pinus echinata Mill., and Pinus palustris Mill. In addition to utilizing traditional forest measurements such as diameter at breast height and total tree height, biomass was estimated as functions of volume, latitude, and longitude. We also evaluated the differences in wood density by geographic location for these species. The …
Factors Associated With Undergraduate Students Pursuing Health And Dietetic Careers, Claire Bolen Hardin
Factors Associated With Undergraduate Students Pursuing Health And Dietetic Careers, Claire Bolen Hardin
Theses and Dissertations
This descriptive cross-sectional study investigated factors that influenced undergraduate students’ career paths within health care and the dietetics field. A 34-item Qualtrics survey was emailed to undergraduate students. Most of the participants (N=355) were females (72.2%), 72.9% were white students and 21.6% were black or African Americans. Results indicated the main reason students chose their major was personal interest. Other reasons included lifestyle, family, potential financial success, and friends. More than 50% of students indicated they personally knew someone who has the job they desire after college. Diversity within majors and health-related professions could be influenced by gender and ethnicity. …
Human Behavioral And Technological Adaptation To The Younger Dryas In The Midsouth: Investigations Into The Mississippi Projectile Point Survey, Christopher Dylan Colucci
Human Behavioral And Technological Adaptation To The Younger Dryas In The Midsouth: Investigations Into The Mississippi Projectile Point Survey, Christopher Dylan Colucci
Theses and Dissertations
In this study, I use 1,163 Paleoindian bifaces from Mississippi to study human behavioral changes in response to the Younger Dryas climate event (12,900 – 11,700 cal yr BP). I use the “organization of technology” as a theoretical approach and a modified version of the marginal value theorem to track changes in Paleoindian lithic technology through time and compare those changes to regional paleoenvironmental data. I find a decrease in absolute point size, increase in rates of resharpening, and expansion of settlement organization and raw material preferences throughout the Younger Dryas. I argue that the organization of hunter gatherer technology …
Application Of Numerical Weather Prediction With Machine Learning Techniques To Improve Middle Latitude Rapid Cyclogenesis Forecasting, Colin Matthew Snyder
Application Of Numerical Weather Prediction With Machine Learning Techniques To Improve Middle Latitude Rapid Cyclogenesis Forecasting, Colin Matthew Snyder
Theses and Dissertations
This study goal was to first determine the baseline Global Forecast System (GFS) skill in forecasting borderline (non-bomb:0.75-0.95, bomb: 1.-1.25) bomb events, and second to determine if machine learning (ML) techniques as a post-processor can improve the forecasts. This was accomplished by using the Tempest Extreme cyclone tracking software and ERA5 analysis to develop a case list during the period of October to March for the years 2008-2021. Based on the case list, GFS 24-hour forecasts of atmospheric base state variables in 10-degree by 10-degree cyclone center subdomains was compressed using S-mode Principal Component Analysis. A genetic algorithm was then …
Three Rival Versions Of Physical Education: A Macintyrean Analysis Of The Field, Clayton Michael Whalen
Three Rival Versions Of Physical Education: A Macintyrean Analysis Of The Field, Clayton Michael Whalen
Theses and Dissertations
At both the theoretical and applied levels of analysis, the field of physical education is all too often completely incoherent. There appears to be little agreement as to how school-based programs ought to be implemented or what the goals of such programs really are. No two physical educators run their programs exactly the same and, chances are, those physical educators likely have wildly different understandings of their field and its proper place within the education of our youth. Borrowing from the title of moral philosopher Alasdair MacIntyre’s (1990) book, Three Rival Versions of Moral Enquiry, I’ve chosen to describe the …
Investigating Differences In Perceived Value And Opportunities For Student Professional Development In Chemistry Graduate Programs, Contessa L. Maggard
Investigating Differences In Perceived Value And Opportunities For Student Professional Development In Chemistry Graduate Programs, Contessa L. Maggard
Theses and Dissertations
The primary focus of chemistry graduate programs in R1 universities in the United States (US) is training students to become research scientists. However, additional skills, such as effective presentations, writing practical proposals, teaching, mentoring, and networking, are essential for successful careers. This study evaluates the emphasis on professional development skills in R1 chemistry graduate programs in the US, as perceived by graduate students and professors, and their perceived adequacy in preparing graduate students for academic careers. A questionnaire survey of current graduate students and faculty members was conducted. Results indicated that current graduate students perceived a lack of development opportunities …
Expanding The Emotional Cascade Model Of Borderline Personality Disorder With Negative Thoughts, Thought Control Strategies, Suicide Attempts, And Non-Suicidal Self-Injury, Courtney K. Mason
Expanding The Emotional Cascade Model Of Borderline Personality Disorder With Negative Thoughts, Thought Control Strategies, Suicide Attempts, And Non-Suicidal Self-Injury, Courtney K. Mason
Theses and Dissertations
Borderline personality disorder (BPD) is an impairing mental illness and has a core component of emotional dysregulation. Evidence suggests the emotional cascade model describes how this emotional dysregulation leads to engaging in risky and life-threatening behaviors, such as non-suicidal self-injury (NSSI). Specifically, this model describes rumination as a cognitive component that links the emotional and behavioral dysregulation. The current study aimed to expand the model by investigating how individuals with heightened BPD traits engage in NSSI and in cognitive strategies to cope with their negative affect. Specifically, it was investigated whether behaviors like suicide attempts and cognitions differentiated between those …
Simulated Residual Nitrogen Scavenging And Recovery Among Cover Crop Systems Using Nitrogen-15 In A Corn Production Setting, Curtis Champ Knight
Simulated Residual Nitrogen Scavenging And Recovery Among Cover Crop Systems Using Nitrogen-15 In A Corn Production Setting, Curtis Champ Knight
Theses and Dissertations
Nitrogen recovery and contribution to production agricultural systems are critical services provided by cover crops investigated in this study. Research was conducted to evaluate the effect of simulated residual N (SRN) on N recovery in various winter cover crop systems (CCS) and subsequent effects on corn N uptake. Biomass, C and N measurements, 15N recovery, and sources of N acquisition were quantified among CCS. Subsequently, CCS and SRN effects on corn productivity and N status were quantified. Grass-included CCS had the greatest N scavenging ability by CCS termination, though they had negative or neutral effects on corn N acquisition. Brassicas-included …
The Conservation Genetics Of Elassoma Alabamae And Phylogeography Of Elassoma Evergladei, David Lee Pounders
The Conservation Genetics Of Elassoma Alabamae And Phylogeography Of Elassoma Evergladei, David Lee Pounders
Theses and Dissertations
The southeastern U.S. is a hotspot of aquatic biodiversity and endemism in the upland and Coastal Plain regions. One component of this biodiversity is the Pygmy Sunfishes of the genus Elassoma. I used next-generation sequencing to aid in the understanding and conservation of these enigmatic fish. My first chapter focused on one of the most restricted species in the U.S. the Spring Pygmy Sunfish Elassoma alabamae. In this study I found four distinct genetic populations, evidence of founder effects, and that a newly discovered population is native. My second chapter focused on the Everglades Pygmy Sunfish Elassoma evergladei a more …
Designing And Understanding Physical Behavior Of Polymeric Materials, Chinmoy Saha
Designing And Understanding Physical Behavior Of Polymeric Materials, Chinmoy Saha
Theses and Dissertations
Organic conjugated polymers (CPs) are emerging materials for advanced electronic applications such as organic photovoltaics (OPVs), field-effect transistors (OFETs), light-emitting diodes (OLEDs), flexible and wearable electronics, and biomedicals. High-spin donor-acceptor CPs have been investigated for their potential applications in magnetic and spintronic devices. Inter-chain charge transfer among these high-spin polymers mainly depends on the nature of the local structure of the thin film and pi-stacking between the polymer chains. However, the microscopic structural details of high-spin polymeric materials are rarely studied, especially in the liquid phase, and remain largely unexplored. This study examined the effects of oligomer chain length, side …
Time After Time: Deciphering Structural Violence And Vulnerability Using Postmortem Recovery Time Data And Demographics Throughout The Southeast Region Of The United States, Elise J. Adams
Theses and Dissertations
Over the last few decades, forensic anthropological research has made significant strides in developing better methods for decedent identification and increasing the accuracy of time since death/postmortem interval (PMI) estimations within medicolegal contexts. Until recently however, there has been little emphasis placed on how socioeconomic considerations might be connected, especially regarding recovery times for individuals from various demographic backgrounds. Using intersectional and biocultural frameworks and data collected from forensic anthropologists and medicolegal labs throughout the Southeastern US, this research aims to decipher the role that inequality, through instances of social vulnerability and structural violence, plays in recovery time data throughout …
Examining The Impact Of De-Escalation Training For Rural Mississippi Leos: Using Simulation To Assess Behavioral Outcomes, Deepali Manoj Dhruve
Examining The Impact Of De-Escalation Training For Rural Mississippi Leos: Using Simulation To Assess Behavioral Outcomes, Deepali Manoj Dhruve
Theses and Dissertations
People with mental illness (PMI) are at a 67% greater risk of arrest and 16 times greater risk of being killed during a police incident than other civilians. Indeed, law enforcement officers (LEOs) report lacking expertise when addressing mental health calls, and existing trainings aimed at reducing violence in LEO encounters with PMI do not account for challenges specific to rural LEOs. Additionally, many trainings are severely lacking in assessing outcome changes pre- and post-training with more than half of trainings relying on survey-based knowledge subject to social desirability bias and inaccurate self-assessment. This study aimed to address limitations in …
Diffusion Of Water Conserving Irrigation Practices In The Mississippi Delta, Eugene Oku
Diffusion Of Water Conserving Irrigation Practices In The Mississippi Delta, Eugene Oku
Theses and Dissertations
The expanding irrigated acreage in the Mississippi Delta has resulted in increased withdrawals that exceed the recharge rate of the Mississippi River Valley Alluvial Aquifer (MRVAA), leading to a decline in water levels. This trend poses a threat of rapid depletion, potentially resulting in deteriorating water quality and increased pumping costs in the region. Water-conserving irrigation practices are a key component to any potential solution, promising enhanced water use efficiency and sustainable agricultural practices. Nonetheless, farmers adopt these practices at different times. This study used a duration model to identify the factors that influence the timing of adoption of computerized …
Silvicultural Strategies For Converting Longleaf Pine Plantations To Multi-Aged Stands With Groundcover Species Restoration In Georgia, Usa, Gabriel F. Nyen
Silvicultural Strategies For Converting Longleaf Pine Plantations To Multi-Aged Stands With Groundcover Species Restoration In Georgia, Usa, Gabriel F. Nyen
Theses and Dissertations
For some forest landowners in the southern USA, multiple ecological and economic objectives are met through the conversion of longleaf pine (Pinus palustris) plantations to uneven-aged stands. This study was conducted in eight similarly-aged longleaf pine plantations at The Jones Center at Ichauway in southwestern Georgia. The stands were disturbed by commercial thinning in 2014 and partially disturbed by Hurricane Michael in 2018 and half of the stands were seeded with native grasses and a forb in 2015. I developed explanatory models of groundcover biomass and longleaf pine seedling occurrence and density. I detected a community composition difference in groundcover …
Manifold Design For A High-Enthalpy, Long-Duration High Speed Wind Tunnel, Gradon Parker Bailey
Manifold Design For A High-Enthalpy, Long-Duration High Speed Wind Tunnel, Gradon Parker Bailey
Theses and Dissertations
Since the 1940s, the study of supersonic and hypersonic flow has posed significant challenges due to the variable aerodynamic characteristics and alterations in air properties at such high speeds. Hypervelocity wind tunnels have been instrumental in addressing gaps in this field, yet no existing facility can fully replicate true hypersonic conditions. The primary obstacle lies in sustaining the high enthalpies and targeted total conditions necessary for authentic supersonic and hypersonic environments. This paper focuses on the development of a mixing manifold section for a high enthalpy, long-duration hypervelocity wind tunnel designed to provide clean airflow and accurately replicate true hypervelocity …
Robust Longitudinal Velocity Control For Advanced Vehicles: A Deep Reinforcement Learning Approach, Fahmida Islam
Robust Longitudinal Velocity Control For Advanced Vehicles: A Deep Reinforcement Learning Approach, Fahmida Islam
Theses and Dissertations
Longitudinal velocity control, or adaptive cruise control (ACC), is a common advanced driving feature aimed at assisting the driver and reducing fatigue. It maintains the velocity of a vehicle and ensures a safe distance from the preceding vehicle. Many models for ACC are available, such as Proportional, Integral, and Derivative (PID) and Model Predictive Control (MPC). However, conventional models have some limitations as they are designed for simplified driving scenarios. Artificial intelligence (AI) and machine learning (ML) have made robust navigation and decision-making possible in complex environments. Recent approaches, such as reinforcement learning (RL), have demonstrated remarkable performance in terms …