Digital Commons Network^™

Study Of Surface And Groundwater Quality And Quantity At Watershed Scale In Mississippi, Dipesh Nepal

Theses and Dissertations

Hydrology and water quality are affected by land use and climate changes. Mississippi’s diverse agro–ecosystem comprises of a range of land use land cover (LULC) including agriculture, forest, wetlands, urban, and grasslands. The objectives of this study were to investigate the impacts of various factors such as Best Management Practices (BMPs), wetlands, LULC, and climate changes on water quality and quantity. The hydrologic and water quality responses to dynamic LULC input in Soil and Water Assessment Tool (SWAT) were evaluated. Results showed that agricultural and forest expansion were major drivers of hydrologic and water quality changes in Big Sunflower River …

Moisture Effects On Visible Near-Infrared And Mid-Infrared Soil Spectra And Strategies To Mitigate The Impact For Predictive Modeling, Francis Hettige Chamika Anuradha Silva

Theses and Dissertations

Instrumental disparities and soil moisture are two of the key limitations in implementing spectroscopic techniques in the field. This study sought to address these challenges through two objectives. The first objective was to assess Visible-near infrared (VisNIR) and mid-infrared (MIR) spectroscopic approaches and explore the feasibility of transferring calibration models between laboratory and portable spectrometers. The second objective addressed the challenge of soil moisture and its impact on spectra. The portable spectrometers demonstrated comparable performance to their laboratory-based counterparts in both regions. Spiking with extra-weight, was the most effective calibration transfer method eliminating disparities between instruments. The samples were rewetted …

Cement Stabilization Of Poorly Graded Sand, Lana Grayson Brown Sisung

Theses and Dissertations

Stabilization of poorly graded sand in full-scale applications is challenging. This thesis evaluated cement-stabilized sand and had two objectives: (1) evaluation of stabilized material using the PM device to quantify engineering properties for future comparison to alterative materials and to investigate the effectiveness of the device with sand and (2) investigation of the merits of alternative application of cement to sand to benchmark against other topically applied materials. The PM device was successfully used to recommend 10% cement for field studies with one sand, successfully allowed data collection in laboratory and field applications, and its potential in sand seems promising …

Employee Job Satisfaction Of Public Sector Professionals: The Roles Of Public Safety Work And Public Service Motivation, Victor Flomo

Theses and Dissertations

Employee job satisfaction of public sector professionals: The roles of public safety work and public service motivation

A Thematic Analysis Of Religious Identity And Volunteer Motivation Among Emerging Adult Members Of The Church Of Jesus Christ Of Latter-Day Saints, Jennifer R. Smith

Theses and Dissertations

This study sought insight into the religious and cultural identity of emerging adults belonging to the Church of Jesus Christ of latter-day Saints(LDS) and the impact such identity had in relation to volunteering motivation. Participants included 24 emerging adult college students belonging to the Church. Thematic analysis was used to determine influencing factors that led to Church membership and how Church membership shaped self-perception. Participants shared volunteer experiences and motivation to volunteer in relation to Deci and Ryan’s (2000) self-determination theory (SDT) was examined. The motivation of relatedness was identified among 100% of participants as compared to competence (37.5%) and …

Hypothalamic Manipulation Of The Anuran Hpg Axis: Alternative Hormones And A Non-Invasive Administration Route For Amphibian Assisted Reproductive Technologies (Art), Erin Michelle Saylor

Theses and Dissertations

Amidst the amphibian extinction crisis, in situ and ex situ amphibian species conservation initiatives utilize assisted reproductive technologies for optimal genetic management of captive and wild populations. Development of effective, simple, low-cost methods for obtaining gametes for artificial fertilization, sperm biobanking, or natural breeding alleviates obstacles for institutions or programs to apply reproductive technologies. Objectives herein include investigating the efficacy of alternative hormones for inducing spermiation, an alternative hormone administration route for inducing ovulation, exploring the physiological effects of hormone therapy, and utilizing sperm from deceased animals for biobanking.

Development Of An Automated Delivery System To Apply Copper Sulfate Crystals Using Precision Dry Fertilizer Application Technology, Kevin Charles Wise

Theses and Dissertations

The digenetic trematode, Bolbophorus damnificus, poses a substantial threat to catfish aquaculture, causing significant economic losses. Infestations lead to suppressed feed consumption, secondary bacterial infections and poor production performance. Survey data reveals widespread infestation in the in the southeastern United States. Current control strategies involve the application of a concentrated copper sulfate solution to reduce snail populations which serve as the first intermediate host of the trematode life cycle. This study aimed to improve treatment efficacy by developing a granular copper sulfate application system. A modified Gandy fertilizer applicator, equipped with a programmable control system, demonstrated accurate distribution of copper …

Neural Networks For Improved Signal Source Enumeration And Localization With Unsteered Antenna Arrays, John T. Rogers Ii

Theses and Dissertations

Direction of Arrival estimation using unsteered antenna arrays, unlike mechanically scanned or phased arrays, requires complex algorithms which perform poorly with small aperture arrays or without a large number of observations, or snapshots. In general, these algorithms compute a sample covriance matrix to obtain the direction of arrival and some require a prior estimate of the number of signal sources. Herein, artificial neural network architectures are proposed which demonstrate improved estimation of the number of signal sources, the true signal covariance matrix, and the direction of arrival. The proposed number of source estimation network demonstrates robust performance in the case …

Effects Of Electrical Stimulation On Water-Soluble Flavor Compounds In Beef Semimembranosus Muscle, Chelsie Beebe

Theses and Dissertations

This study examined the effects of electrical stimulation on water-soluble flavor compounds in beef semimembranosus muscle, collected immediately after exsanguination (PRE), immediately after stimulation (POST), and 24 h postmortem (H24) from both stimulated (ES) and non-stimulated (CON) carcasses. Short-chained peptides were greater in ES at H24 (P = 0.007). Glutamic acid concentration was above its taste threshold (0.044 mmol/kg) and was less in ES at PRE and POST by 0.030 mmol/kg (P ≤ 0.028) but was similar in both ES and CON by H24 (P = 0.142). Lysine, a Strecker amino acid, was greater in ES at H24 by 0.138 …

Examining The Impact That A Modified School Calendar Had On Teacher Attendance In A Rural Mississippi School District, James W. Carlisle Jr.

Theses and Dissertations

Educational leaders have long recognized the certified classroom teacher as the most important factor in student performance and success. In his research article Teachers Matter: Understanding Teachers’ Impact on Student Achievement for the Rand Corporation, Opper (2019) stated, “When it comes to student performance on reading and math tests, teachers are estimated to have two to three times the effect of any other school factor, including services, facilities, and leadership” (para. 2). While district and school administrators certainly understand the impact teachers have on student performance, little has been done to mitigate the issue of teacher absenteeism, which has become …

Advancing Air Filtration Analysis: A Comprehensive Approach To Particle Loading Models, Gentry Nathaniel Berry

Theses and Dissertations

Fibrous air filters are commonly used to capture airborne particles due to their potential for a relatively high capture efficiency and low airflow resistance. Their performance characteristics make them ideal candidates in many instances, spanning a wide range from residential to sensitive industrial applications. However, as more particles are captured, the performance of the filter will evolve. This evolution of performance typically manifests as a higher capture efficiency and higher airflow resistance resulting from the additional particulate deposits. The prediction of fibrous filter performance has been the focus of research for many decades, resulting in numerous analytical, numerical, and empirical …

Scalable And Explainable Self-Supervised Motif Discovery In Temporal Data, Somayeh Bakhtiari Ramezani

Theses and Dissertations

The availability of a scalable and explainable rule extraction technique via motif discovery is crucial for identifying the health states of a system. Such a technique can enable the creation of a repository of normal and abnormal states of the system and identify the system’s state as we receive data. In complex systems such as ECG, each activity session can consist of a long sequence of motifs that form different global structures. As a result, applying machine learning algorithms without first identifying the local patterns is not feasible and would result in low performance. Thus, extracting unique local motifs and …

A Conceptual Decentralized Identity Solution For State Government, Martin Duclos

Theses and Dissertations

In recent years, state governments, exemplified by Mississippi, have significantly expanded their online service offerings to reduce costs and improve efficiency. However, this shift has led to challenges in managing digital identities effectively, with multiple fragmented solutions in use. This paper proposes a Self-Sovereign Identity (SSI) framework based on distributed ledger technology. SSI grants individuals control over their digital identities, enhancing privacy and security without relying on a centralized authority. The contributions of this research include increased efficiency, improved privacy and security, enhanced user satisfaction, and reduced costs in state government digital identity management. The paper provides background on digital …

The Cost Of Voting Categorized: A Comprehensive Review, Landon Brady

Theses and Dissertations

The primary purpose of this paper is to analyze the research field of cost of voting and review the relevant literature on voter participation. After reviewing the literature, a development of a theoretical framework to categorize multiple variables associated with the cost of voting will be completed. The goal is to create clear, concise, and simple categories that define the cost of voting. This should add conceptual clarity to the field by linking variables into a common foundation. The research also connects the sociological and psychological category of intrapersonal to concepts of social group needs, sense of achieving a greater …

Improved Methodology For Conducted Emi Assessment Of Power Electronics And Line Impedance Measurement, Mark Anthony Didat

Theses and Dissertations

Electromagnetic Interference (EMI), primarily common mode (CM), is problematic in a wide range of electronic circuits due to its propensity to radiate, particularly in high power applications. It is routine for much effort and resources to be dedicated to its characterization and reduction as EMI compliance is a requirement for most electronic systems and devices, including power electronics. Many well-known factors contribute to a system’s EMI performance including intentional coupling from system components as well as unintentional coupling from parasitics. Sources of intentional coupling may include Y-capacitors intended to mitigate EMI as part of a filter. Unintentional coupling is more …

Stream Water Quality Under Baseflow Conditions In A Livestock Production Area, Maryi Lorena Chavarro Chaux

Theses and Dissertations

This study evaluates the spatial and temporal impacts of implemented Best Management Practices (BMP) on stream water quality under baseflow conditions in a stream segment affected by livestock production. The BMPs includes 10-m fenced riparian zone and crossing paths along the reach segment. Grab water samples and water quality monitoring were collected biweekly from July 2019 to March 2022. Water quality parameters included temperature, dissolved oxygen, electric conductance, total dissolved solids, turbidity, and pH. Water samples were lab analyzed for sediments and nutrients. Results evidenced poor water quality before BMPs implementation, with nutrient concentrations exceeding the nation's and state's criteria. …

Morphological And Structural Characterization Of Shortening Landforms On Mars, Leta Mccullough

Theses and Dissertations

The lithosphere of Mars accommodates shortening through folding and faulting, producing landforms qualitatively categorized as wrinkle ridges or lobate scarps. However, we lack a deep understanding of the morphological differences between these landforms. This study aimed to develop a quantitative model for shortening landform classification based on surface morphology and subsurface architecture. We developed this model by mapping 100 landforms in a GIS, recording parameters for each landform. We conducted a Discriminant Function Analysis (DFA) using these morphometrics. This DFA produced a predictive linear function for categorizing wrinkle ridges and lobate scarps. We then modeled the subsurface structural geology of …

An Investigation Into Applications Of Canonical Polyadic Decomposition & Ensemble Learning In Forecasting Thermal Data Streams In Direct Laser Deposition Processes, Jonathan Storey

Theses and Dissertations

Additive manufacturing (AM) is a process of creating objects from 3D model data by adding layers of material. AM technologies present several advantages compared to traditional manufacturing technologies, such as producing less material waste and being capable of producing parts with greater geometric complexity. However, deficiencies in the printing process due to high process uncertainty can affect the microstructural properties of a fabricated part leading to defects. In metal AM, previous studies have linked defects in parts with melt pool temperature fluctuations, with the size of the melt pool and the scan pattern being key factors associated with part defects. …

Network Layer Reliability And Security In Energy Harvesting Wireless Sensor Networks, Jing Yang

Theses and Dissertations

Wireless sensor networks (WSNs) have become pivotal in precision agriculture, environmental monitoring, and smart healthcare applications. However, the challenges of energy consumption and security, particularly concerning the reliance on large battery-operated nodes, pose significant hurdles for these networks. Energy-harvesting wireless sensor networks (EH-WSNs) emerged as a solution, enabling nodes to replenish energy from the environment remotely. Yet, the transition to EH-WSNs brought forth new obstacles in ensuring reliable and secure data transmission.

In our initial study, we tackled the intermittent connectivity issue prevalent in EH-WSNs due to the dynamic behavior of energy harvesting nodes. Rapid shifts between ON and OFF …

Traffic Light Detection And V2i Communications Of An Autonomous Vehicle With The Traffic Light For An Effective Intersection Navigation Using Mavs Simulation, Mahfuzur Rahman

Theses and Dissertations

Intersection Navigation plays a significant role in autonomous vehicle operation. This paper focuses on enhancing autonomous vehicle intersection navigation through advanced computer vision and Vehicle-to-Infrastructure (V2I) communication systems. The research unfolds in two phases. In the first phase, an approach utilizing YOLOv8s is proposed for precise traffic light detection and recognition, trained on the Small-Scale Traffic Light Dataset (S2TLD). The second phase establishes seamless connectivity between autonomous vehicles and traffic lights in a simulated Mississippi State University Autonomous Vehicle Simulation (MAVS) environment resembling a small city with multiple intersections. This V2I system enables the transmission of Signal Phase and Timing …

Evaluating Selected Properties Of Underutilized Hardwood Species For Fabrication Of Cross-Laminated Timber Industrial Mats, Mercy Itunu Ogunruku

Theses and Dissertations

Softwood is more in demand than hardwood because it is used primarily in the US's largest wood-consuming industry, construction, resulting in increased importation of softwood annually to meet this demand. Hardwood, used for non-structural purposes like furniture and interior designs, is more abundant in US forests. However, some hardwood species are underutilized and undervalued. Cross-laminated timber (CLT) has increased the demand for softwood.

A study evaluated the mechanical and physical properties of three underutilized hardwood species (321 yellow poplar, 393 sweetgum, and 262 red oak specimens) for CLT industrial mat manufacturing. The results showed that red oak had a higher …

Cobalt Chromium In Biomedical Applications And The Development Of A Pspp Map, Nouralhouda Jamal

BCoE Publications

During the world wars, Cobalt-Chromium (Co-Cr) alloys gained prominence for their use in aircraft engine components, where they exhibited high temperature strength and durability. They are used in a wide range of industries due to their unique set of qualities, particularly strength, corrosion resistance, and biocompatibility. They have emerged as versatile materials with a broad spectrum of applications, from aerospace and automotive components to biomedical implants.

This paper presents a thorough analysis of its composition, processing techniques, microstructure, mechanical properties, and performance characteristics. The primary goal of this project is to develop a PSPP (Process, structure, properties, and performance) map …

Impact Of Prolonged Professional Development On Teachers’ Confidence In Using Inquiry-Based Learning In The Classroom, Kasey Harmon, Taylor Ruth, Bryan Reiling, Nathan W. Conner, Christopher T. Stripling

Journal of Human Sciences and Extension

Professional development (PD) programs for science and agriculture teachers designed around the inquiry-based learning (IBL) teaching strategy could help to improve science proficiency amongst our high school students. PD that continues over a longer period of time is more effective than short-term workshops. The purpose of this study was to explore the impact of a prolonged PD program on teachers’ confidence in using IBL strategies for teaching animal sciences content. The following research questions guided this study: RQ1: What were participants’ perceptions of a prolonged PD program? and RQ2: How did the prolonged PD program influence the participants’ confidence in …

Barriers To Policy, Systems, And Environment Work: Using Community Engagement As A Tool In Snap-Ed’S Multi-Level Comprehensive Programming, Cristian Meier, Casey Coombs, Amria Farnsworth, Lacee Jimenez, Heidi Leblanc

Journal of Human Sciences and Extension

Implementing policy, system, and environmental (PSE) changes has several well-known challenges that have been documented in Supplemental Nutrition Assistance Program Education’s (SNAP-Ed) comprehensive approach to obesity prevention and reduction. The purpose of the current study was to explore the use of community engagement (CE) as a strategy to address the common challenges experienced in implementing a multi-component community-based program. Phone interviews (N = 7) were conducted with SNAP-Ed educators in Utah using semi-structured interviews. Emergent themes were identified as transcripts were coded independently by two researchers until a high level of agreement was achieved. Four themes emerged from the interviews: …

Determining The Health Literacy Skills Of Extension Audiences In Maryland, Beverly Jackey, Heejung Song, Lisa Mccoy, Virginia Brown

Journal of Human Sciences and Extension

Strong health literacy skills empower people to make informed health decisions, especially those with chronic health conditions striving for positive health outcomes. Half of all people living in Maryland report having at least one chronic disease. Research examining the health literacy of Marylanders is limited. This paper reports how establishing a baseline for health literacy levels of Marylanders can identify major factors affecting the health literacy skills of Extension audiences and lays the important groundwork to develop Extension programs and explore the best delivery methods tailored to the needs of subpopulations. Using the Newest Vital Sign, a …

Volunteers’ Stewardship Action-Taking Experiences During The Covid-19 Pandemic Predicted By Their Motivation Toward Engagement And Ability To Teach Others, Suzanna R. Windon, Olga Buchko, Linda Falcone

Journal of Human Sciences and Extension

The current study investigates the relationship between volunteer stewardship action-taking, motivation toward engagement in volunteer activities, and the ability to teach others during the COVID-19 pandemic. The final data set included 1,196 responses from the Penn State Extension Master Gardeners and Master Watershed volunteers, which provided a response rate of 39.9%. The results of this study showed that approximately 15.1% of the variation in volunteer stewardship action-taking experiences could be explained by volunteers’ motivation toward engagement in volunteer activities and their ability to teach others. Most findings are in line with previous research. Extension and outreach educators and volunteer coordinators …

Cooperative Extension Programming For Early Care And Education Professionals During The First Year Of The Covid-19 Pandemic: Evidence From A National Survey Of Extension Systems, Katherine Speirs, Azriella Friedman, Courtney Luecking, Kyleigh Brown

Journal of Human Sciences and Extension

Cooperative Extension Systems (CESs) provide programming to early care and education (ECE) professionals. The COVID-19 pandemic significantly impacted the needs of ECE professionals. The purpose of this study was to document how CESs helped ECE professionals respond to the pandemic during its first year and how Extension programming was altered in response to the pandemic. Between March and June 2020, representatives from all 87 CESs in the 50 U.S. states; Washington, DC; and six U.S. territories were invited to complete an online survey that included six questions about the pandemic. We received responses from 43 CESs (49% response rate). The …

Profiles Of Youth Citizenship: A Cluster Analysis Of Ethical Factors, Demographics, And Problem-Solving Disposition, Sarah Bush, Rick Rudd, Curt Friedel, Thomas Archibald, Kerry Redican

Journal of Human Sciences and Extension

Youth have the capacity to drive positive change in their communities through active and engaged citizenship (AEC). Teen leadership programs provide youth with opportunities to develop the skills necessary to participate as partners in community problem-solving efforts. Situated in relational developmental systems metatheory, this study examined how cluster membership based upon demographic characteristics, ethical factors, and problem-solving disposition impacted AEC. The findings indicated significant differences between clusters for AEC, civic duty, and civic skills. These differences were predominately observed through membership in long-term or short-term leadership programs, gender, enrollment in honors/AP courses, ethical views, and problem-solving disposition. Youth leadership practitioners …

Examining College Students’ Attitudes Toward Poverty During The Adult Role Of The Community Action Poverty Simulation, Jessica M. Parks, Portia Johnson, Diann C. Moorman, Sheri Worthy, Leigh Anne Aaron

Journal of Human Sciences and Extension

Family and Consumer Sciences (FCS) and Extension professionals need to understand the lived experience of poverty because it affects every aspect of an individual’s life. Poverty is related to inadequate nutrition and food insecurity, lack of access to health care, insufficient child care, unsafe neighborhoods, lack of affordable housing, under-resourced schools, and a lower quality of life. Attitudes toward poverty vary widely among Americans and can be categorized as either internal/individual attributions (e.g., laziness, welfare dependency, etc.) or systemic/structural attributions (e.g., unemployment, inflation, etc.). Individuals holding internal attributions toward poverty are more likely to have negative feelings toward impoverished individuals. …

A Snapshot In Time: Consumer Behavior At The Start Of Covid-19, Michelle L. Childs, Christopher Sneed, Ann A. Berry, Sejin Ha

Journal of Human Sciences and Extension

During the early stages of the coronavirus pandemic, consumers faced challenges related to obtaining household items due to shortages and limitations in shopping. Researchers from the University of Tennessee conducted a national, web-based consumer survey of 300 consumers in late April 2020 to better understand consumer behavior, shopping patterns, and demand shifts for goods and services. Major findings demonstrate that consumers have increased shopping for essential products from brick-and-mortar national chains, avoided brick-and-mortar small businesses, and have chosen to shop more by themselves, often choosing to forgo spending from across all product categories, compared to prior to the pandemic. Additionally, …