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Articles 601 - 630 of 21402
Full-Text Articles in Entire DC Network
Understanding The Impact Of Tropical Sea Surface Temperature Biases On The Projection Of North American Precipitation, William Tyler Edwards
Understanding The Impact Of Tropical Sea Surface Temperature Biases On The Projection Of North American Precipitation, William Tyler Edwards
Theses and Dissertations
Tropical SST biases in climate models significantly impact the projection of US precipitation. To show how these biases affect US precipitation simulation, I conducted nudging and flux adjustment experiments using the CESM1. In the nudging experiments, observed SSTs were prescribed over the three tropical oceans, and were compared to the control model to assess the effects of tropical SST biases. For the flux adjustment experiments, climatological SST and momentum fluxes were nudged towards the observed climatology, allowing us to characterize the effects of SST biases on the future projections of precipitation. Results indicate SST biases significantly affect the simulation of …
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 …
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 …
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 …
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 …
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 …
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], …
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 …
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 …
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 …
Forest Management In Changing Landscapes: Evaluating Hurricane Damage And Salvage Market Dynamics, Ian Pereira Sartorio
Forest Management In Changing Landscapes: Evaluating Hurricane Damage And Salvage Market Dynamics, Ian Pereira Sartorio
Theses and Dissertations
This dissertation comprises three interrelated studies exploring the effects of hurricanes on forestlands and the optimization of salvage logging practices. The first study examines land cover changes and salvage logging patterns following Hurricane Michael. It utilizes predictive models to identify key drivers of these changes, exploring the relative influence of storm intensity, forest vulnerability, and economic/operational factors. The second study builds upon these findings, focusing on the agent attribution for land cover change observations leveraging advanced remote sensing tools and relevant spatial data. By distinguishing between wind damage and salvage logging activities, it advances the understanding of post-hurricane land cover …
Examining The Role Of Hypertension-Induced Mechanotransduction On Vascular Smooth Muscle Cells And Vascular Calcification, Jessica Moon
Examining The Role Of Hypertension-Induced Mechanotransduction On Vascular Smooth Muscle Cells And Vascular Calcification, Jessica Moon
Theses and Dissertations
Cardiovascular disease is the world’s number 1 killer. The cardiovascular system helps to pump blood throughout the human body and maintain a systemic balance. However, medial vascular calcification results when this system becomes off balance, such as in cases of high blood pressure leading to hypertension. Many factors are involved in this process, but the most important is the vascular smooth muscle cell phenotypic switch to osteoblast-like cells. When vascular smooth muscle cells are subject to mechanical stimuli, mechanotransduction occurs, causing an intracellular signaling cascade leading to a phenotypic switch associated with the Wnt signaling pathway and osteogenic markers. There …
Unseeing The Seen: Jugha, Larra Myron Diboyan
Unseeing The Seen: Jugha, Larra Myron Diboyan
Theses and Dissertations
The annihilation of the Armenian Medieval Cemetery of Jugha, located in the exclave Nakhijevan Autonomous Republic, in the current-day Republic of Azerbaijan, took place between 1998-2006. The systematic structural violence used by the Azerbaijani state, sponsored destruction of Indigenous Armenian cultural heritage, usurpation of sacred spaces, attempted rewriting of history, and reshaped the landscape, therefore distorting reality and memory. This research aims to scrutinize the tactics used by the Republic of Azerbaijan in their erasure of the Old Jugha cemetery and present how not only is this a case of structural violence but also one of landscape structural violence against …
Toward Privacy-Preserving Component Certification For Metal Additive Manufacturing, Mahathir Mohammad Bappy
Toward Privacy-Preserving Component Certification For Metal Additive Manufacturing, Mahathir Mohammad Bappy
Theses and Dissertations
Metal-based additive manufacturing (AM) has emerged as a cutting-edge technology for fabricating complex geometries with high precision. However, the major challenges to the wider adoption of metal AM technologies are process uncertainty-induced quality issues. Consequently, there is an urgent need for fast and reliable certification techniques for AM components, which can be achieved by leveraging Artificial Intelligence (AI)-enabled modeling. Developing a robust AI-enabled model presents a significant challenge because of the costly and time-intensive nature of acquiring diverse and high volume of datasets. In this context, the data-sharing attributes of Manufacturing-as-a-Service (MaaS) platforms can facilitate the development of AI-enabled certification …
Solution Synthesis Of Colloidal Strontium Zirconium Sulfide Nanomaterials, Naira Arrykova
Solution Synthesis Of Colloidal Strontium Zirconium Sulfide Nanomaterials, Naira Arrykova
Theses and Dissertations
Chalcogenide perovskites with a distorted ABX3 structure (A: Ca, Ba, Sr; B: Zr, Hf; X: S, Se) are a prominent focus in optoelectronic materials. One of these is BaZrS3 which has garnered significant attention in perovskite materials due to its distinctive distorted perovskite structure and valuable optical properties that are viable for a single-junction solar cell and present a compelling option for tandem solar cell configurations. Another promising material is SrZrS3 which exists in two phases: needle-like non-perovskite α-SrZrS3 and distorted perovskite β-SrZrS3. The distorted perovskite phase shows promising luminescence properties in bulk, making it potentially viable for LED applications. …
Buffering The Strained Relation Between Masculinity And Social Support With Self-Compassion, Nathan Barclay
Buffering The Strained Relation Between Masculinity And Social Support With Self-Compassion, Nathan Barclay
Theses and Dissertations
Men experience high rates of negative health outcomes and often have difficulty identifying and seeking support for their issues. Traditional masculine socialization has been identified as a potential determinant of this effect, as masculine ideals often conflict with prosocial help-seeking behaviors. Men who experience this sort of socialization need better support for their mental health and are less likely to seek it out in a professional setting. Therefore, other models of support, like social support, should be investigated. Additionally, factors that impact the way that men perceive social support should be explored, one of which may be self-compassion. The current …
The Impact Of Economic And Social Factors On New Venture Creation In Saudi Arabia, Nawaf Alharbi
The Impact Of Economic And Social Factors On New Venture Creation In Saudi Arabia, Nawaf Alharbi
Theses and Dissertations
This dissertation examines the factors influencing entrepreneurship in Saudi Arabia, focusing on economic, social, and cultural aspects. Three hypotheses guide the study: 1) Economic factors. 2) The social environment. 3) There is a positive relationship between prior and subsequent venture creation. Using panel data from 13 regions between 2008 and 2022, findings show that positive economic changes, higher income per capita, lower unemployment, and higher business density significantly boost new venture creation. Access to finance and prior venture creation also positively influence subsequent entrepreneurial activities. However, a higher proportion of foreign workers and marriage rates negatively correlate with new venture …
Incorporating Cover Crops Into Successful Corn Production Systems In The Mid-South, Nolan Mullican
Incorporating Cover Crops Into Successful Corn Production Systems In The Mid-South, Nolan Mullican
Theses and Dissertations
Cover crops are known to produce many conservation benefits. However, grower adoption remains low due to various issues and poor economic returns. This study was conducted to identify factors and management practices needed to integrate cover crops into Midsouth corn production systems. The effects of cover crop species, herbicide termination timing, and mechanical termination methods on the growth, grain yields, and economic returns of corn [Zea Mays (L.)] were investigated in Mississippi. The presence of living cover crops at planting stunted corn growth when they were not terminated by herbicides at least four weeks preplant. A legume cover crop reduced …
Divergent Selection For Anthesis Of Annual Ryegrass (Lolium Perenne Ssp. Multiflorum), Prakriti Adhikari
Divergent Selection For Anthesis Of Annual Ryegrass (Lolium Perenne Ssp. Multiflorum), Prakriti Adhikari
Theses and Dissertations
Annual ryegrass (Lolium perenne ssp. multiflorum) is an excellent cover crop for winter-fallow fields of the Southeast. However, late senescence and herbicide resistance pose challenges for spring eradication. This study aims to develop a ryegrass variety that naturally senescence early using the recurrent phenotypic selection. A base population with anthesis dates from March 21 to April 2 was collected in 2022. 903 seedlings of this population were grown in Cycle0. For Cycle1, the Cycle0 population upon anthesis was segregated into NV0 (11 non-vernalizing), E0 (earliest 70 to anthesis), and L0 (last 70 to anthesis). Isolated groups were allowed to polycross …
Distribution And Abundance Of Breeding Tidal Marsh Birds Across The Mississippi Gulf Coast, Rachel V. Anderson
Distribution And Abundance Of Breeding Tidal Marsh Birds Across The Mississippi Gulf Coast, Rachel V. Anderson
Theses and Dissertations
Tidal marsh and its bird community across the northern Gulf of Mexico are subject to numerous disturbances such as oil spills, hurricanes, habitat loss from land use change, and high relative sea level rise rates looming in the future. Baseline population data and landscape associations are greatly needed to assess the current distribution and the future impact of perturbations on marsh birds across the Mississippi Gulf Coast. Using a standardized sampling design and point count survey protocol, we determined the abundance and population size of Clapper Rails, Common/Purple Gallinules, Least Bitterns, Marsh Wrens, Seaside Sparrows, Red-winged Blackbirds, and Common Yellowthroats …
Adverse Childhood Experiences, Behavioral Problems, And The Role Of Positive Childhood Experiences, Scout Savoy
Adverse Childhood Experiences, Behavioral Problems, And The Role Of Positive Childhood Experiences, Scout Savoy
Theses and Dissertations
Adverse Childhood Experiences (ACEs) are traumatic events that individuals experience in childhood that have been linked to problems with physical and mental health in adulthood (Felitti et al., 1998). Previous research suggests that ACEs are prevalent in almost two-thirds of youth regardless of location across the world and that when an individual experiences three or more ACEs, their quality-adjusted life expectancy is found to decrease (Carlson et al., 2019; Jia & Lubetkin, 2020). Although ACEs have been associated with negative outcomes, not all individuals who experience trauma exhibit problematic behavior and are considered to have high levels of resilience (Agaiba …
Design And Fabrication Of Cellulose Nanofibril (Cnf) Based Microcapsules And Their Applications, Shuaib Ahmed Mubarak
Design And Fabrication Of Cellulose Nanofibril (Cnf) Based Microcapsules And Their Applications, Shuaib Ahmed Mubarak
Theses and Dissertations
Emulsions, comprising dispersed oil or water droplets stabilized by surfactants, are widely employed across industries. However, conventional surfactants raise environmental concerns, and emulsions may encounter stability challenges during storage. A promising alternative lies in Pickering emulsions, where particles adhere irreversibly at the water-oil interface, providing enhanced stability. Recent research explores the use of natural bio-based particles as interfacial stabilizers for creating Pickering emulsions, offering improved stability and environmental friendliness. This significant change towards particle-stabilized emulsions addresses sustainability and efficacy concerns. This dissertation investigates the application of cellulose nanofibrils (CNFs) in stabilizing Pickering emulsions for the development of functional microcapsules with …
Enhancing Afm Particle Analysis And Shape Factor Identification With Machine Learning, William David Mckelvey
Enhancing Afm Particle Analysis And Shape Factor Identification With Machine Learning, William David Mckelvey
Theses and Dissertations
Through enhancing aerosol particle measurement accuracy by determining particle shape factors using Atomic Force Microscopy (AFM) combined with machine learning techniques, this study aims to provide a methodology that will improve the precision of aerosol measurements and contribute to the development of more effective filtration technologies. Accurate shape factor measurement is crucial for devices such as the Scanning Mobility Particle Sizer (SMPS), which often assume spherical particles of uniform density. By identifying and analyzing particles in AFM scans using machine learning techniques, this research provides a better understanding of shape factors, improving the quality of aerosol measurements. These advancements contribute …
Deep Learning-Based Radio Frequency Interference Detection And Mitigation For Microwave Radiometers With 2-D Spectral Features, Ahmed Manavi Alam
Deep Learning-Based Radio Frequency Interference Detection And Mitigation For Microwave Radiometers With 2-D Spectral Features, Ahmed Manavi Alam
Theses and Dissertations
Radio frequency interference (RFI) poses significant challenges for passive microwave radiometry used in climate studies and Earth science. Despite operating in protected frequency bands, microwave radiometers often encounter RFI from sources like air surveillance radars, 5G communications, and unmanned aerial vehicles. Traditional RFI detection methods rely on handcrafted algorithms designed for specific RFI types. This study proposes a deep learning (DL) approach, leveraging convolutional neural networks to detect various RFI types on a global scale. By learning directly from radiometer data, this data-driven method enhances detection accuracy and generalization. The DL framework processes raw moment data and Stokes parameters, dynamically …
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 …
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. …