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Articles 541 - 570 of 21402
Full-Text Articles in Entire DC Network
Habitat Suitability Modeling For Optimizing Stand Initiation And Restoration Efforts Of Economically And Ecologically Important Hardwoods, Segun Michael Adeyemo
Habitat Suitability Modeling For Optimizing Stand Initiation And Restoration Efforts Of Economically And Ecologically Important Hardwoods, Segun Michael Adeyemo
Theses and Dissertations
This dissertation addresses critical challenges in forest management and restoration in the Lower Mississippi Alluvial Valley (LMAV) through a series of interconnected studies focused on improving habitat suitability modeling and growth prediction for oak species. The research employs advanced modeling techniques to enhance our understanding of species-habitat relationships and forest dynamics in the context of climate change. Initial studies focused on developing ensemble habitat suitability models for American chestnut (Castanea dentata) and butternut (Juglans cinerea), two historically important but currently threatened tree species. These models predict suitable habitats and potential range shifts under various climate change scenarios, highlighting the species' …
Evaluation And Characterization Of Two Capacitive Sensors For Cotton Moisture Measurement In Static And Dynamic Modes For Real-Time Use In Cotton Gin, Sushma Perati
Theses and Dissertations
Two capacitive sensors, a commercial FP-32C and a custom design capacitor plate were evaluated for real-time cotton moisture content (MC%) measurement in ginning environment. The sensors were able to measure MC ranges of 3.56%–19.7% and 4.56%–21.04% MC for FP-32C and custom capacitor pate, respectively. In dynamic mode, the ranges were 4.9%–14.5% and 4.9%–14.7% respectively. Results showed that measurements of both sensors had strong correlations with results obtained from oven method. A comparison of moisture content measurement methods using a moisture balance (M5 Thermo 163M,) and oven method was conducted with the result showing that Lint-Only samples were the most closely …
Improved Vector Pruning For Partially Observable Markov Decision Processes, Thomas Jonathan Bowman
Improved Vector Pruning For Partially Observable Markov Decision Processes, Thomas Jonathan Bowman
Theses and Dissertations
Exact dynamic programming algorithms for planning problems that are represented as partially observable Markov decision processes rely on a subroutine that removes, or ``prunes", dominated vectors from sets of vectors that represent piecewise-linear and convex value functions. The classic vector pruning subroutine solves one linear program per vector, where the number of variables is equal to the size of the state space and the number of constraints is equal to the number of vectors shown so far to be undominated. Thus, its scalability is limited not only by the number of linear programs it solves, but especially by their size. …
Perceptions Of University Staff Member Organizational Belonging In Higher Education: A Quantitative Analysis, Amanda Mcknight Baine
Perceptions Of University Staff Member Organizational Belonging In Higher Education: A Quantitative Analysis, Amanda Mcknight Baine
Theses and Dissertations
The purpose of this study is to examine organizational belonging among staff members working in higher education. While staff members are vital to the operations, maintenance and overall organizational function of higher education institutions, this group represents a seldom studied population. Given their essential role and the impact of the pandemic on work life perspectives, it is important to recognize the experiences of staff members and seek to understand current perceptions of organizational belonging with implications from retention to work quality. To measure organizational belonging, a modified survey developed by Blau et al. (2023) was used, looking at 4 scale …
Assembly And Analysis Of A Mobile Reactor System For The Continuous Conversion Of Landfill Gas To Sustainable Aviation Fuels, Benjamin Eston Gibens
Assembly And Analysis Of A Mobile Reactor System For The Continuous Conversion Of Landfill Gas To Sustainable Aviation Fuels, Benjamin Eston Gibens
Theses and Dissertations
Recent policy changes have shifted research and development to pursue technology that promotes a circular economy and net zero emissions by 2050. Current research is actively developing “drop-in” sustainable aviation fuels (SAF) that reduce emissions and are compatible with modern-day jet engines, mimicking conventional jet fuel's physical and chemical properties. While ensuring sustainable engine performance and operability using drop-in SAF is critical, several challenges remain in the economic outlook of SAF production. Biogas reforming and Fischer-Tropsch synthesis (FTS) can be used in series to convert landfill gas to SAF; however, novel design approaches must be considered to alleviate capital and …
Engineering Functionalized Nanomaterials For Targeting And Ablating Biofilms On Surfaces, Dhanush Lakmal Yapa Amarasekara
Engineering Functionalized Nanomaterials For Targeting And Ablating Biofilms On Surfaces, Dhanush Lakmal Yapa Amarasekara
Theses and Dissertations
Biofilms on both the surface and interior of medical devices pose major challenges, including hindering device performance and serving as infection sources. These biofilms form a protective layer around bacteria, shielding them from the body’s immune system and antibiotics. This makes infections difficult to treat, as the bacteria within the biofilm are resistant to both antibiotics and immune defenses. Additionally, biofilms can induce inflammation and irritation in nearby tissues, leading to further health complications. Antibiotic resistance raises concerns about the emergence of multi-drug resistant (MDR) pathogens. MDR infections are difficult to treat, leading to prolonged hospital stays and the need …
Effects Of A Snap-Ed Social Marketing Campaign On Behavior Change, Andrew Beall Cole
Effects Of A Snap-Ed Social Marketing Campaign On Behavior Change, Andrew Beall Cole
Theses and Dissertations
Introduction: This research studied the use of a social marketing campaign to address chronic diseases in the U.S., such as obesity, diabetes, hypertension and other cardiovascular diseases by assessing audience self-reported actions and evaluating message framing effects on participant intentions to change nutrition behavior and daily physical activity. Approach: Evaluate a social marketing campaign for effects on SNAP-Ed eligible clients and research message framing effects on audience’s intention to change health behaviors. Discussion: The HappyHealthy social marketing campaign launched in 2018 by Mississippi State University Extension. Outcome evaluation data (collected 2023) reported multiple correlations between core messages recalled and increased …
Understanding Stream Litter Loading Through Watershed Characteristics, Elinor Reed Mallon
Understanding Stream Litter Loading Through Watershed Characteristics, Elinor Reed Mallon
Theses and Dissertations
Litter, whether river-based, marine, or terrestrial, is an ever-increasing environmental and economic issue. However, litter in freshwater environments is studied less than in marine environments. To better understand factors impacting stream-transported floating litter, seven watershed characteristics were assessed across a network of thirty litter collection devices. The research objective for this study was to quantify litter loading and assess watershed characteristics relative to litter loading. Of the various watershed characteristics in this study, land cover classification had the greatest impact on the amount of litter collected from the Litter Gitters followed by median household income. Results from this study can …
It’S About Time: Early Bronze Age Chronology Further Refined With 14c Testing At Tell El-Hesi, Erika Marie Niemann
It’S About Time: Early Bronze Age Chronology Further Refined With 14c Testing At Tell El-Hesi, Erika Marie Niemann
Theses and Dissertations
In 2019, the author re-presented two 14C dates for Tell el-Hesi in the northern Negev desert of modern-day Israel that were originally published in 2006 by Anderson. Here, 10 additional samples out of the total recovered corpus by The Joint Archaeological Expedition to Tell el-Hesi in 1979 from the EB III occupation in Field VI, were 14C tested to refine further the EB III absolute dates for the site. The samples come from two main contexts along the EB III city wall, representing both the interior occupational debris and an ash dump feature found along the exterior of the city …
Discrimination The Roles Of Anthropogenic Greenhouse Gases And Aerosols On Tropical Cyclone Frequency From Downscaling Cmip6 Models, George Gyabaah
Discrimination The Roles Of Anthropogenic Greenhouse Gases And Aerosols On Tropical Cyclone Frequency From Downscaling Cmip6 Models, George Gyabaah
Theses and Dissertations
Tropical cyclones (TCs) are devastating disasters, yet predicting their future activity remains highly uncertain. To better understand the impacts of different anthropogenic forcings, specifically greenhouse gases (GHG) and aerosols on the TCs, I downscaled the single forcing experiments of 11 CMIP6 models in the Columbia HAZard Model (CHAZ). This analysis focused on changes in the distribution of the North Atlantic (ATL) and Western North Pacific (WNP) basins and explored the shift in environmental variables that drive them. We then used the formulation of the genesis component of CHAZ as a constraint to quantify the relative contribution of each predictor relative …
Exploring Single Particles Through Optical Trapping And Advanced Laser Spectroscopy Techniques, Haifa Hassan Alali
Exploring Single Particles Through Optical Trapping And Advanced Laser Spectroscopy Techniques, Haifa Hassan Alali
Theses and Dissertations
This dissertation explores the innovative integration of optical trapping (OT) with advanced laser spectroscopy techniques to investigate the physicochemical properties of single particles from a variety of atmospheric aerosols, such as bioaerosols, terrestrial dust, and extraterrestrial dust. Each technique offers unique insights, significantly enhancing our understanding of these critical atmospheric components. The first work focuses on employing OT in conjunction with cavity ringdown spectroscopy (OT-CRDS) to measure the single-particle extinction of interplanetary dust particles at ultraviolet wavelengths (~308 nm). This method allows for the stable trapping of individual dust particles in air, facilitating precise characterization with minimal external interference. Our …
Mass Timber Utilization In Architecture: Carbon Sequestration, Building Materials And Construction Practices, Jacob Alan Gines
Mass Timber Utilization In Architecture: Carbon Sequestration, Building Materials And Construction Practices, Jacob Alan Gines
Theses and Dissertations
The built environment must innovate and adopt new materials and construction practices in order to meet current and forecasted environmental challenges, economic uncertainties and construction pressures. The specification of mass timber materials and building assemblies will play a major role in addressing these issues. The objectives of this research are fourfold: 1) Develop a deeper understanding among construction professionals of the role mass timber buildings can have in greatly reducing CO2 emissions through the use of renewable forest products and the storage of carbon in buildings; 2) Provide insights into the utilization of mass timber products for architectural application that …
The Digital Divide Among Urban University Students In The Post-Pandemic Era, J. B. Oleet
The Digital Divide Among Urban University Students In The Post-Pandemic Era, J. B. Oleet
Theses and Dissertations
This survey study, N = 44 university students, from an urban campus, measured post-pandemic digital divide perceptions, focusing on motivational, physical, skills, and usage access to ICTs through the lens of van Dijk’s resources and appropriation theory. Statistical tests, including one-sample t-tests, correlation analyses, one-way and repeated measure ANOVAs, and independent sample t-tests, highlighted both the perceptions and relationships among different dimensions of digital divides. The findings showed that participants perceive their post-pandemic digital divide perceptions positively. Intrinsic Motivational Access (IMA) mean scores were particularly high, suggesting a strong internal drive among students to engage with ICTs, significantly surpassing extrinsic …
"We Don't Say That, Margaret!" : Narratives Of White Women Admissions Officers And Their Exploration Of Whiteness And White Racial Identity, Kelsey Aline Walker
"We Don't Say That, Margaret!" : Narratives Of White Women Admissions Officers And Their Exploration Of Whiteness And White Racial Identity, Kelsey Aline Walker
Theses and Dissertations
This qualitative narrative inquiry study examined the narratives and experiences of White women admissions officers at predominantly white institutions (PWIs) and explored how they engaged with the development of their white racial identity throughout their professional careers. Using Critical Whiteness Studies (CWS) and Helms’ (1990) white racial identity development model, the research questions were: What are White women admissions officers’ narratives of their experiences with whiteness at predominately white institutions? How do White women's admission officers make meaning of their racial identity? Data was collected from seven White women admissions officers through a demographic survey and two 45-60-minute interviews. The …
Description And Influence Of Diseases On The East Mississippi Catfish Industry, And The Role Of Clay Minerals, Iron, And Aluminum Salts In The Susceptibility Of Channel Catfish To Aeromonas Hydrophila And Edwardsiella Ictaluri, Mark Alan Peterman
Theses and Dissertations
In 2014, a virulent clonal group of Aeromonas hydrophila (VAH) was the predominant disease impacting the east Mississippi (EMS) commercial catfish industry. The EMS aquatic ambulatory service observed an area not prone to VAH outbreaks. In addition, frequent underestimations of the scope and economic impact of the EMS catfish industry and its diseases warranted a descriptive effort. Therefore, the EMS catfish industry, its economic impact, the diseases of this region and their economic impact were described. Further, differences in water and geological chemistry of the area not prone to VAH outbreaks, and the sensitivity of VAH and Edwardsiella ictaluri to …
Predicting Vegetation Override Force For Off-Road Autonomy, Marc Nicholas Moore
Predicting Vegetation Override Force For Off-Road Autonomy, Marc Nicholas Moore
Theses and Dissertations
Vegetation override is an important aspect of off-road ground vehicle mobility. An autonomous ground vehicle’s (AGV) perception system must distinguish between vegetation that can be easily driven through from vegetation that cannot. Predicting the resistance of vegetation could allow path- planning systems to make this distinction. However, despite its importance, direct measurement of vegetation resistance is rare, as most studies use indirect proprioceptive data, such as inertial measurements, as proxies for override force. Notably, there is a lack of empirical data on the override resistance of small stems (< 2.5 cm) and clusters of vegetation on medium-sized (approx. 1000kg) vehicles. To address this gap, a comprehensive dataset of override measurements was collected for clumps of small vegetation relevant to intermediate-sized AGVs navigating off-road terrain. This dataset includes over 70 recordings using the Robot Operating System (ROS) during controlled driving experiments through small trees, grasses, and bushes. The collected data includes light detection and ranging (LiDAR) scans, imagery, force measurements from integrated load cells, and simultaneous localization and mapping (SLAM) information. A key contribution of this research is the development and calibration of a custom push bar system equipped with load cells to directly measure override forces. These measurements are compared to empirical models previously developed by the U.S. Army Corps of Engineers for larger single-stem vegetation. A preprocessing pipeline was developed to automatically extract and label LiDAR and camera data according to these force measurements. This self-labeled dataset was then used to train machine learning models that predict override resistance of vegetation from LiDAR and camera scans alone. This research characterizes the relationship between override forces and the observable features of vegetation as measured by LiDAR and camera sensors. Deep learning models were developed and trained to predict override forces based on different input modalities and features derived from point clouds and images. The performance of these models was compared across various input features to investigate how deep learning can create a generalizable and accurate force prediction system.
Investigation Of Coupled Fluid-Structure Interactions In Supersonic Flows, Seshendra Palakurthy
Investigation Of Coupled Fluid-Structure Interactions In Supersonic Flows, Seshendra Palakurthy
Theses and Dissertations
The skin panels used in high-speed flights are exposed to various types of loads, such as inertial, elastic, and aerodynamic loads. In addition, oblique shock impingement can cause flow separation and unsteady aerodynamic loading, which can reduce vehicle performance and result in acoustic noise and viscous heating. These loads, when combined, can result in a complex dynamic response, such as flutter. Flutter is characterized by sustained unsteadiness or structural vibrations. Although flutter might not be immediately harmful, it can lead to fatigue failure of the structural components. A vast amount of literature already exists on the panel flutter induced by …
Biothermodynamics Of Metal And Dna Coordination To The Pneumococcal Transcription Factors Adcr, Scza, And Copr, Alexander James Cutright
Biothermodynamics Of Metal And Dna Coordination To The Pneumococcal Transcription Factors Adcr, Scza, And Copr, Alexander James Cutright
Theses and Dissertations
ransition metals are micronutrients that play critical roles in all forms of life, acting as stabilizing ions, catalytic centers, and as signaling ions. Due to their importance, classes of biomolecules have been designed with the sole purpose of regulating their intracellular concentrations. One group of which are transcription factors, which regulate intracellular metal concentration by activating or repressing transcription, dependent on metal availability. The activation of transcription factors by metal availability can be attested to conformational changes that are governed by both dynamics and thermodynamics. Due to the influential nature of transcription factors, their activity and activation mode have become …
The Impact Of Diversity, Equity, And Inclusion Trainings And Study/Work Abroad Experiences On The Ability Of Staff And Faculty To Build Systems Of Support For International Students, Alina Fasirovna Nigmatullina
The Impact Of Diversity, Equity, And Inclusion Trainings And Study/Work Abroad Experiences On The Ability Of Staff And Faculty To Build Systems Of Support For International Students, Alina Fasirovna Nigmatullina
Theses and Dissertations
The issue of effective communication with the international students and their comfortable adaptation play an important role in developing the U.S. higher educational system in the field of competition of educational services. The international student population benefits from higher education just as much as higher education benefits from them. If universities are willing to recruit and retain more international students, they must be sensitive to the perceptions, needs, and concerns of prospective and enrolled international students. In order to sustain this, staff and faculty have to be exposed to certain trainings and experiences that will allow them to gain basic …
Analysis Of Positive Solutions For Classes Of Nonlinear Boundary Value Problems, Bandar Alreshidi
Analysis Of Positive Solutions For Classes Of Nonlinear Boundary Value Problems, Bandar Alreshidi
Theses and Dissertations
In this dissertation, we study the existence and uniqueness of positive solutions for classes of nonlinear boundary value problems. In the first study, we the ��-superlinear case, we prove the existence of a large positive solution when a parameter is small and if, in addition, the reaction term satisfies a concavity-like condition at the origin, the existence of two positive solutions for a certain range of the parameter. In the ��-sublinear case, we establish the existence of a large positive solution when a parameter is large. We also investigate the number of positive solutions for the general ��-Laplacian with nonlinear …
A Correlation Study Between Soil Selenium Levels And Diabetes Prevalence Across U.S. Regions: An Archival Data Analysis (2012-2018), Baoshan Wu
Theses and Dissertations
This study investigates the correlation between soil selenium levels and Type 2 diabetes (T2D) prevalence across U.S. regions between 2012 to 2018. Selenium, an essential trace element, plays an important role in antioxidant defense and metabolism. While appropriate selenium intake may protect against diabetes by improving insulin sensitivity and reducing oxidative stress, excessive intake can have adverse effects. This research analyzed the most recent data, from the Centers for Disease Control and Prevention (CDC) and the U.S. Geological Survey (USGS), for over 3,000 counties in the U.S. A correlation analysis model was used to determine the relationship between soil selenium …
Using Additive Manufacturing To Characterize Effects Of Sparse Infill Density And Sparse Infill Pattern On The Compressive Properties Of Short Strand Carbon Fiber Infused Petg, Luke C. Salisbury
Honors Theses
The advent of additive manufacturing has revolutionized the prototyping, design, and manufacturing of new and innovative products. Through the use of Fused Deposition Modeling (FDM), parts can be manufactured using different sparse infill percentages (the percentage of void space within a printed object) and sparse infill patterns (the lattice structure of material within the object). Through the manipulation of these variables, the same material and part can have different compressive and flexural properties. In addition to sparse infill, the thermoplastics used in fused deposition modeling can be reinforced with carbon fiber strands to create a printable composite material capable of …
The Relations Between The Financial Wellbeing Of Custodial Grandparents, Their Overall Wellbeing, And Their Perceived Social Support, Paige L. Miller
The Relations Between The Financial Wellbeing Of Custodial Grandparents, Their Overall Wellbeing, And Their Perceived Social Support, Paige L. Miller
Honors Theses
There have been numerous studies on how the financial wellbeing of custodial grandparents affects their overall wellbeing, and how the amount of social support custodial grandparents receive impacts their depressive and anxiety symptoms. However, little is known regarding the ways in which all three variables are related – financial wellbeing, overall wellbeing, and social support – or their impact on custodial grandparents. We examined the relations between these variables, as well as the moderating relation of financial wellbeing on social support and wellbeing. The data used in the current study was collected as part of a larger project, during which …
Parenting Practices And Attachment Levels In Relation To Externalizing Behaviors In Children Raised By Nonparental Caregivers, Kourtney Mia Barfield
Parenting Practices And Attachment Levels In Relation To Externalizing Behaviors In Children Raised By Nonparental Caregivers, Kourtney Mia Barfield
Honors Theses
Current literature supports parenting practices and the quality of child-caregiver attachments are correlated with child externalizing behavior. However, these results typically come from samples of biological parents and their children. It is unknown if parenting practices (i.e. poor supervision, inconsistent discipline, and positive parenting) predict attachment and externalizing behavior among children of grandparents and foster parents. Previous studies have also found
that attachment mediates the relation between parenting practices and externalizing behavior among children raised by biological parents. This study aims to determine if similar relations will be found among grandchildren and foster children and if the level of attachment …
Sir Nicholas: Chivalric Tropes And Dickens's Critique Of The Aristocracy In Nicholas Nickleby, Erin Quinn
Sir Nicholas: Chivalric Tropes And Dickens's Critique Of The Aristocracy In Nicholas Nickleby, Erin Quinn
Honors Theses
One of the most prominent themes in Charles Dickens’s 1838-39 novel Nicholas Nickleby is the theme of class. In particular, Dickens highlights the tension between the middle and upper classes through the contrast between the middle-class titular protagonist and the novel’s two aristocrats, Sir Mulberry Hawk and Lord Frederick Verisopht. In this thesis, I argue that Dickens foregrounds this contrast through his consistent deployment of tropes of chivalry and knighthood to describe Nicholas and his friends despite their middle-class status. I analyze the application of chivalric language, concepts, and characteristics to the actions and attitudes of the middle-class characters and …
Rehumanizing Mathematics Through Multimodal Microanalysis, Liza Bondurant, Jonathan Troup, Claudia Bertolone-Sith, Diana Moss, Hortensia Soto
Rehumanizing Mathematics Through Multimodal Microanalysis, Liza Bondurant, Jonathan Troup, Claudia Bertolone-Sith, Diana Moss, Hortensia Soto
CoE Publications
We, five math teacher educators (MTEs), share how multimodal microanalysis has the potential to contribute to rehumanizing mathematics education by expanding what counts as evidence of students’ knowings. We define multimodal microanalysis as the detailed examination and interpretation of minute interactions between various sensory modalities and mathematical representations at a granular level. Using mathematics cognitive interview videos, we share our research design and analysis processes and discuss how multimodal microanalysis can contribute to rehumanizing mathematics teaching and learning.
Broadband Access And Digital Skills Case Studies Project, Lionel J. Beaulieu, Anna M. Kleiner, Roseanne Scammahorn, John J. Green
Broadband Access And Digital Skills Case Studies Project, Lionel J. Beaulieu, Anna M. Kleiner, Roseanne Scammahorn, John J. Green
Digital Access
No abstract provided.
Exploring Diet Quality, Food Insecurity, And Health Status Among Utah Residents, Palak Gupta, Lendel Narine
Exploring Diet Quality, Food Insecurity, And Health Status Among Utah Residents, Palak Gupta, Lendel Narine
Journal of Human Sciences and Extension
A lower-quality diet is a significant contributor to preventable mortality worldwide. This study investigated the intricate relationships between diet quality, food insecurity, and health status among residents in Utah. Using a cross-sectional survey design with a sample size of 1,522 participants, data were collected through an online survey focusing on household characteristics, diet quality, health status, and food security. The primary exposure, household food insecurity, was assessed using a validated 6-item scale, while diet quality was measured through a modified Rapid Eating Assessment for Participants– Shortened Version (REAP-S). The findings revealed an association between very low food security and poor …
Personal Protective Equipment For Minoritized U.S. Agricultural Farmworkers: Community-Based Efforts During The Pandemic & Implications For Extension, Helen Trejo
Journal of Human Sciences and Extension
There are an estimated 2 million farmworkers who are essential to the food system in the United States; however, they are exposed to hazardous environmental conditions with limited access and/or use of Personal Protective Equipment (PPE). The primary purpose of this research is to evaluate community-based organizational efforts to provide farmworkers with apparel-textile basic needs, such as face masks. A primary goal is to address the research gap regarding common environmental factors that impact farmworkers, including pesticides and the pandemic, their use of available PPE, and community-based efforts to improve access to face masks as basic PPE. We consider the …
Implementing Youth Mental Health First Aid Training In Cooperative Extension Programs, Anne Marie Iaccopucci, Monica M. Lobenstein, Kendra M. Lewis, Kea Norrell-Aitch
Implementing Youth Mental Health First Aid Training In Cooperative Extension Programs, Anne Marie Iaccopucci, Monica M. Lobenstein, Kendra M. Lewis, Kea Norrell-Aitch
Journal of Human Sciences and Extension
Mental health challenges for youth continue to be a growing concern. Youth- serving organizations have the potential to play a significant role in recognizing the signs and symptoms of mental health challenges in youth. The Youth Mental Health First Aid (YMHFA) training course is widely used to equip adults working with youth with skills to support mental health and de-escalate crisis situations. Cooperative Extension is a trusted organization in many local communities nationwide that delivers YMHFA. Program Leaders from 11 states, representing all five regions of Cooperative Extension, describe their successes and challenges in implementing YMHFA. Experienced program leaders suggest …