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Articles 4381 - 4410 of 74094
Full-Text Articles in Entire DC Network
Synergistic Adsorption Of Pb (Ii) From Aqueous Solution Using Calcined Biochar-Bentonite Clay Hybrid, Azeezat Faderera Abdul-Raheem
Synergistic Adsorption Of Pb (Ii) From Aqueous Solution Using Calcined Biochar-Bentonite Clay Hybrid, Azeezat Faderera Abdul-Raheem
Theses and Dissertations
The biochar-bentonite clay hybrid was prepared by coprecipitation with the goal of producing a material that can remove Pb (II) from aqueous solutions effectively. Incorporating bentonite clay onto the Douglas fir biochar (DFB-BTC) surface significantly improved the adsorption capacity by introducing more active sites, strengthening the structural properties, and promoting strong adsorbate interactions. The point of zero charge of the adsorbent was slightly higher than that of the pristine DFBC. All sorption experiments were performed at pH 5, and the system obeyed the Langmuir adsorption isotherm. The highest Langmuir adsorption capacities observed at 298, 308, and 318 K were 48, …
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 …
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 …
Algal Community Investigations: Present Day To Year-2100 For Mississippi Lakes And The Western Mississippi Sound, Emma Madison Tucker
Algal Community Investigations: Present Day To Year-2100 For Mississippi Lakes And The Western Mississippi Sound, Emma Madison Tucker
Theses and Dissertations
Algae play a key role in the aquatic environment as primary producers; however, they can form harmful algal blooms that are detrimental to the aquatic environment, people, and even the economy. It is generally believed that climate change will influence future algal blooms. The first study estimated algae community in three freshwater locations in Mississippi, Desoto Lake, White’s Creek Lake, and Columbus Lake, and one saline location, Western Mississippi Sound, using modern and new tools of the autonomous surface vessel, FlowCam, and EcoTaxa. From those results and leading into the second study was the application of four climate scenarios on …
Identification And Characterization Of The Antimicrobial Activities Of Pseudomonas Sp. Strain Wp18, Emma Suzanne Willis
Identification And Characterization Of The Antimicrobial Activities Of Pseudomonas Sp. Strain Wp18, Emma Suzanne Willis
Theses and Dissertations
Strain WP18 was isolated from disease suppressive soil of a soybean rhizosphere in the Mississippi Delta. Phylogenetic analysis supported that strain WP18 could represent a novel species within the genus Pseudomonas. This conclusion is supported by genome-wide bioinformatic analyses such as average nucleotide identity and genome to genome distance calculations. Further studies are needed to claim a novel bacterial species, which include cell fatty profiles, fingerprinting analysis, and polar lipid analysis based on the International Code for Nomenclature of Prokaryotes. Strain WP18 showed a broad-spectrum of antimicrobial activity against plant pathogenic bacteria and fungi that are economically important in agriculture, …
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 …
Experimental And Numerical Investigation Of Phase Change Material Melting Cycle In Microgravity, Ethan Michael Schuetzle
Experimental And Numerical Investigation Of Phase Change Material Melting Cycle In Microgravity, Ethan Michael Schuetzle
Theses and Dissertations
Efficient thermal management of spacecraft systems is crucial to overcome the extreme thermal conditions in space. Phase change materials (PCMs) offer significant advantages in thermal energy storage (TES) systems due to their high latent heat of fusion, the amount of energy stored or released during phase transitions. However, PCMs face limitations due to low thermal conductivity, especially in microgravity where heat transfer is primarily through conduction. This research addresses this issue by incorporating a 3D-printed aluminum lattice structure to enhance heat transfer to PCMs. Experimental data from sub-orbital flight tests and ground-based experiments, coupled with numerical simulations, are used to …
Projecting Land Cover Changes And Impacts On Bird Conservation Using Geographic Information System, Remote Sensing And A Cellular Automata – Artificial Neural Network Model In Nairobi National Park, Kenya., Frank Juma Ong'ondo
Theses and Dissertations
This study examines land cover changes and their projected future impacts on bird species conservation in and around Nairobi National Park, Kenya. 2016 and 2023 Satellite imagery, analyzed through Google Earth Engine and the MOLUSCE plugin were used to assess changes in five land cover types: grassland, shrubland, forest, urban, and water. Bird population data from the Kenya Bird Map were used to evaluate birds' responses to land cover changes. Birds were categorized into five habitat guilds—grassland-dependent, shrubland-dependent, forest-dependent, water-dependent, and urban-dependent bird species. Between 2016 and 2023, grassland and shrubland decreased by 14.21% and 5.54%, respectively, and urban increased …
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 …
Fisheries Management In Mississippi State-Operated Fishing Lakes: A Review And Look To The Future, Hayden Gregory Funk
Fisheries Management In Mississippi State-Operated Fishing Lakes: A Review And Look To The Future, Hayden Gregory Funk
Theses and Dissertations
The Mississippi Department of Wildlife, Fisheries and Parks currently manages 18 State Lakes and 17 State Park Lakes to provide public fishing opportunities. My goal was to conduct a comprehensive analysis of monitoring and management activities in State Lakes to enhance understanding of lake dynamics, further develop existing management initiatives, and identify alternative avenues for effective management. To achieve this objective, I have undertaken a comprehensive examination and synthesis of the historical background pertaining to State Lakes and conducted an analysis of pertinent data regarding lake characteristics such as the physical and chemical attributes of the lakes, the features of …
Evaluation Of Current Management Strategies For The Tarnished Plant Bug And Tobacco Thrips In Midsouthern Cotton, Hunter Lane Lipsey
Evaluation Of Current Management Strategies For The Tarnished Plant Bug And Tobacco Thrips In Midsouthern Cotton, Hunter Lane Lipsey
Theses and Dissertations
The tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), is an important economic pest of cotton, Gossypium hirsutum (L.), in the Midsouth region of the United States. An experiment was conducted to determine the impact of insecticide class loss on yield and Lygus populations in the recently commercialized ThryvOn cotton technology. Data indicated no significant yield loss when excluding any currently utilized insecticide class for tarnished plant bug management. An additional objective was to reevaluate the sampling interval necessary to scout ThryvOn cotton for Lygus. No significant differences were observed between a 3 or 7-day sample interval compared to plots …
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 …
Evaluating The Emergent Wetland Plant Juncus Effusus As A Tool In Phytoremediation Of Nitrogen And Copper, Jacob Aaron Hockensmith
Evaluating The Emergent Wetland Plant Juncus Effusus As A Tool In Phytoremediation Of Nitrogen And Copper, Jacob Aaron Hockensmith
Theses and Dissertations
Eutrophication is an increasing issue around the globe, including the Lower Mississippi Alluvial Valley where excess nitrogen runs into the Mississippi River and subsequently the Gulf of Mexico. The restoration of wetlands is one method that has been developed to help reduce nitrogen runoff, however, species selection should be done carefully as species selected must not only remove nitrogen but be able to compete with established species. Chapter II of this thesis investigates whether J. effusus is a viable candidate for use in this role. Additionally, copper contamination around the globe is increasing due to a variety of anthropogenic sources. …
Changing Attitudes And Increasing Fruit And Vegetable Intake Of Elementary-Aged Children Through School Gardens, Hayley Rae Meriwether
Changing Attitudes And Increasing Fruit And Vegetable Intake Of Elementary-Aged Children Through School Gardens, Hayley Rae Meriwether
Theses and Dissertations
Fruit and vegetable consumption is critical for children’s health, yet many fail to meet recommended intake levels. School gardens have the potential to increase consumption and improve attitudes toward fruits and vegetables. This study examined the impact of a school gardening program on children’s attitudes and consumption of fruits and vegetables using a pre- and post-test design. While most children reported enjoying gardening and trying new produce, no significant changes were observed in overall attitudes or consumption patterns after the intervention. However, increased consumption of apples and green beans was noted. The findings suggest that while school gardens can spark …
Assessing Plate Load Testing And Modulus Of Subgrade Reaction Determination For Pavements, Jami Lynn Rushing
Assessing Plate Load Testing And Modulus Of Subgrade Reaction Determination For Pavements, Jami Lynn Rushing
Theses and Dissertations
This thesis aims to: 1) determine the effect of plate size on the modulus of subgrade reaction (k), 2) investigate the differences between the ASTM D1196-21 and CRD-C 655-95 plate load test methods, and 3) develop new effective k curves. 150 plate load tests were executed on three subgrade materials under varying base course thicknesses. Plate load testing was designed to evaluate various plate sizes and testing standards (e.g., the military standard – CRD-C 655-96 and the ASTM standard – ASTM D1196-21). By performing plate load tests on varying base course thicknesses, newly developed effective k curves were developed from …
Beyond Clear Paths: Training With Neural Style Transfer And Auto-Augmentation For Domain-Generalized Segmentation Of Soiled Images, Jacob Randall Kutch
Beyond Clear Paths: Training With Neural Style Transfer And Auto-Augmentation For Domain-Generalized Segmentation Of Soiled Images, Jacob Randall Kutch
Theses and Dissertations
The use of image segmentation within mission-critical autonomous vehicle applications is contingent on reliability of visual sensors, which may become significantly compromised by environmental occlusions such as mud, water, dust, or ice. This thesis explores semantic segmentation techniques tailored for identifying occluded regions, addressing the limitations of conventional methods under unpredictable real-world conditions. Given the scarcity of training datasets with realistic occlusions and the resulting reliance on synthetic data, this research leverages style transfer augmentations and a novel augmentation policy optimization framework to diversify training datasets and improve model generalization. A newly-curated dataset of naturally occurring occlusions evaluates the efficacy …
The Plastics Crisis: Responsible Recycling In Civil Engineering And Infrastructure, Jason Howell Stewart
The Plastics Crisis: Responsible Recycling In Civil Engineering And Infrastructure, Jason Howell Stewart
Theses and Dissertations
A global plastics crisis exists with around 400 million metric tons (MMT) of plastics production and 350 MMT of plastics waste generated annually around the globe. Plastics are durable and essentially non-biodegradable, so they accumulate in both terrestrial and marine environments as pollution and within landfills without breaking down over time. Plastics are ubiquitous in 21st-century society and culture, comprising essential elements in most industries including packaging, transportation, electrical/electronics, and building/construction. The role of civil engineering and infrastructure in addressing the plastics crisis was specifically explored. Responsible plastics recycling yields products with improved engineering properties, performance characteristics, marketability, and/or manufacturing …
Factors Influencing Quality Of Citizen Science-Collected Litter Data And The Retention Of Recruited Citizen Scientists, Jessi Alexandria James-Barry
Factors Influencing Quality Of Citizen Science-Collected Litter Data And The Retention Of Recruited Citizen Scientists, Jessi Alexandria James-Barry
Theses and Dissertations
There are many benefits to using citizen science in scientific research, however, there are several perceived limitations. One being that citizen science data are often viewed as inferior or unusable by the broader science community. A primary concern to the usability and accuracy of this data depends on the level of training a participant receives. Another limitation is the recruitment and retention of volunteers participating in the data collection process. To further understand how training level affects the accuracy of citizen science and how demographics may influence participation, this study evaluated 73 volunteers trained in two different marine debris data …
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 …
Plastic Contaminants Detection And Classification In Seed Cotton Using Customed Design Feeder Separator Unit And Convolutional Neural Network, Jonathan Harjono
Plastic Contaminants Detection And Classification In Seed Cotton Using Customed Design Feeder Separator Unit And Convolutional Neural Network, Jonathan Harjono
Theses and Dissertations
The thesis presents an application of a convolutional neural network (CNN) to detect and classify plastic contaminants in seed cotton in real-time, in a ginning environment. A multi-layered CNN was developed and used to detect plastic contaminants from images captured by a universal serial bus (USB) camera, in a flowing cotton stream, with an artificial lighting system. The CNN was trained using a collection of images captured in the dynamic setting that simulated real-time cotton flow using a custom design feeder system. The CNN was trained in Google Colaboratory (Colab) environment. After the training was completed, it was then converted …
A Case Against Exclusive Reliance On Volumetric Mixture Characterization For Future Asphalt Pavements And The Advancement Of A Viable Alternative, Jonathan Randy Easterling
A Case Against Exclusive Reliance On Volumetric Mixture Characterization For Future Asphalt Pavements And The Advancement Of A Viable Alternative, Jonathan Randy Easterling
Theses and Dissertations
Volumetric properties have been the cornerstone of asphalt mixture design and control dating back to the early 20th century. However, social and economic drivers have caused the asphalt industry to make changes in materials and processes used to produce mixtures that have stretched the limits of volumetric centric methodologies. The primary objectives of this dissertation were to present an extensive case on how volumetrics is limited in their ability to characterize asphalt mixtures and to advance the body of knowledge of a viable alternative. State agency specifications were examined and found that Departments of Transportation (DOTs) were using asphalt volumetric …
Advances In Cluster Detection Via Order Statistics, Renewal Processes And Model Selection Methods With Applications To Financial Forensic Statistics, Kwabena Ansong Boateng
Advances In Cluster Detection Via Order Statistics, Renewal Processes And Model Selection Methods With Applications To Financial Forensic Statistics, Kwabena Ansong Boateng
Theses and Dissertations
This dissertation develops a novel method to detect clusters that appear in financial transaction data that are linked to fraud. The methods utilize properties of order statistics, renewal processes, and model segmentation. We apply the Minimum Description Length (MDL) principle to select the best model. Our technique makes use of a genetic algorithm to determine the number and location of anomalous cluster(s) embedded in a set of financial transactions. We apply our novel cluster detection method to the Paycheck Protection Program (PPP), a U.S. Government initiative launched in April 2020 amid the COVID-19 pandemic to aid small businesses affected by …
Accountability Matters: An In-Depth Analysis Of Institutional Faculty Support Programs And How They Impact Black Faculty., Lakan Lashona' Powell
Accountability Matters: An In-Depth Analysis Of Institutional Faculty Support Programs And How They Impact Black Faculty., Lakan Lashona' Powell
Theses and Dissertations
The experiences of Black faculty at predominantly White institutions have a complex history and have caused one glaring issue: a lack of retention. Specific calls to action have led to changes; however, more should be done to ensure this underrepresented group is utilized in the most effective manner. While most scholars focus on Black faculty who do not stay; it is critical to explore those who do. The purpose of this research was to distinguish what influences IFSPs played in the faculty success and ultimate stay of Black faculty at two predominantly White institutions in the state of Mississippi. This …
An Analysis Of Suspension Days Among Students In Special Education And General Education In A Rural School District, Lakesia Falanda Bryant
An Analysis Of Suspension Days Among Students In Special Education And General Education In A Rural School District, Lakesia Falanda Bryant
Theses and Dissertations
An Analysis of Suspension Days Among Students in Special Education and General Education in A Rural School District, is designed to look at those disciplinary trends that directly affect our most vulnerable population of students, with an emphasis on suspension, expulsions and the rates at which special education students are suspended and/or expelled as compared to their non-disabled peers in a rural district in Mississippi. As the Mississippi State Department of Education cited this district for its high rate of suspension and/or expulsions of students with Individualized Educational Plans, this study is of significant importance in identifying those factors that …
An Open-Source, Student-Centric Approach To The Cyber Kill Chain, Justin Lane Wooten
An Open-Source, Student-Centric Approach To The Cyber Kill Chain, Justin Lane Wooten
Theses and Dissertations
The cybersecurity landscape demands professionals with practical skills and a deep understanding of attack methodologies. However, many institutions face significant challenges in providing comprehensive cybersecurity education due to the high costs associated with commercial tools and platforms. This thesis presents a student-centric, open-source curriculum for teaching the Cyber Kill Chain, designed to bridge the gap between theoretical knowledge and real-world application while addressing the financial constraints faced by many educational institutions. Our approach leverages freely available tools and hands-on exercises to cover each phase of the Cyber Kill Chain, emphasizing ethical considerations and collaborative learning. We detail the curriculum development …