Digital Commons Network^™

Thermomechanical Characterization And Modeling Of An Smp-Epoxy Composite For Deployable Space Structures, Ap Anshuman Behera

Theses and Dissertations

Deployable space structures can be stowed in a compact form and later allowed to their operational shape. Carbon fiber reinforced polymer (CFRP) composites have been utilized as a material candidate due to their increased strength-to-weight ratio and tailored performance. Current challenges associated with CFRP composites are driven by the viscoelastic nature of the polymer matrix causing long-term stowage effects and deployment issues such as shape deformation and incomplete recovery. In this study, a shape memory polymer (SMP) is presented as a potential option in mitigating these issues. An epoxy SMP is synthesized and experimentally characterized and its performance in the …

Simulating Wind-Induced Temporal Variability In Gnss Transmissometry Via Coherent Bistatic Scattering, Brantley Allen Forrest

Theses and Dissertations

Global Navigation Satellite System Transmissometry is a technique for forest remote sensing. Interpreting these measurements requires physically based models to relate observed signal behavior to underlying biophysical parameters. A limitation of current electromagnetic modeling approaches is the assumption that vegetation optical depth is static. In practice, forest canopies, and therefore vegetation optical depth, are dynamic systems continuously influenced by wind. These geometric changes alter the scattering environment and introduce temporal variability in the received signal, particularly through phase-sensitive multipath interactions. This thesis presents a methodology for simulating wind dynamics for first-order scattering. The approach integrates a procedural, stochastic aeroelastic wind …

Ocean Salinity Effects On Lightning Frequency And Distribution In The Inner Core Of Tropical Cyclones In The Atlantic Basin, Desiree Knight

Theses and Dissertations

Different oceanic salinity profiles seen in the Atlantic have been found to influence tropical cyclone (TC) intensity. With the freshwater plume from the Amazon-Orinoco reaching into a TC development region during peak hurricane season, the stable ocean feature it creates has effects on SST, ocean mixing, enthalpy fluxes, and convection. This study investigates the relationship between sea surface salinity (SSS) and inner-core lightning of north Atlantic TCs and further explores the spatial variations of this relationship with TC intensity. SSS values are collocated with lightning flashes, which are split between “fresher” and “saltier” waters. Further investigations found that TCs have …

How Family Functioning Impacts Adolescent Outcomes: The Roles Of Cohesion, Flexibility, Communication, Satisfaction, And The Family Environment On Well-Being Across Levels Of Family Complexity, Emily E. Shaw

Theses and Dissertations

This dissertation research is a combination of two studies. The overarching and guiding focus for this study involved how family functioning and environments influence adolescent psychological well-being, and do these associations vary based on levels of family complexity. Study 1 examined family complexity and family environments as potential predictors of family functioning, while Study 2 examined family functioning and family complexity as potential predictors of adolescent negative (i.e., anxiety and depression) and positive (i.e., engagement, perseverance, optimism, connectedness, and happiness) well-being. In Study 1, family complexity was not predictive of family functioning, but the family environment was a strong predictor. …

Exploring Rural Ap Stem Motivation, Interests, And Aspirations: A Self-Determination Theory Lens, Erin Seger Mcguire

Theses and Dissertations

Science, technology, engineering, and mathematics (STEM) have become the focal point of many countries around the world, with the intention of strengthening national renown by being the first to make advancements in STEM domains. The United States has recognized the importance of STEM and STEM education, though these efforts are lacking in rural areas, like Mississippi. These schools often serve underrepresented populations and may be unable to financially support learning opportunities inside and outside the classroom. Additionally, the national teacher shortage disproportionately affects science and mathematics classes; in rural schools, teachers in these areas may be underqualified, as the schools …

Development Of Genomic Tools To Improve Science-Based Management Of American Black Bears (Ursus Americanus), Fabian A. Jimenez

Theses and Dissertations

American black bear (Ursus americanus) monitoring programs often use minimally invasive genetic monitoring techniques (hair snares) to estimate abundance and density. Historically, microsatellites have been used to identify individuals from hair samples and create mark-recapture histories to estimate population size. However, microsatellite-based genotyping requires multiple replicates and visual confirmation of consensus genotypes. Advances in genetic sequencing technology have led to methods like Genotyping-in-Thousands by sequencing (GT-seq), which allow automated genotyping using bioinformatic pipelines, thereby reducing the number of replicate samples required to confirm genotypes and increasing data portability. We developed a GT-seq panel for individual identification of black bears using …

Sustainable Approaches For Water Remediation And Soil Amendment, Hashani Abeysinghe Herath Mudiyanselage

Theses and Dissertations

Hydrosphere decontamination and sustainable agriculture are economic, health, and environmental concerns. Conventional non-destructive and destructive water treatment methods, and fertilizer formulations, can be expensive or ineffective. Biochar-nutrient composites have gained global acceptance as adsorbents or soil additives due to biochar’s modifiable surfaces, enabling enhanced performance and environmental benefits. This dissertation studied sustainable methods for removal of aqueous arsenic(V) by adsorption and destruction of per- and polyfluoroalkyl substances (PFASs) in liquid ammonia by defluorination and fertilizing phosphorus-deficient soil. Chapter II focuses on the surface morphological and physicochemical changes in alkali-exposed microparticulate magnetite-deposited rice husk (RH) biochar (Fe3O4@RHBC) relative to its pristine …

Analyzing The Relationship Between Financial And Real Estate Investment And Agricultural Land Values., Hudu Abukari

Theses and Dissertations

Using agricultural transaction data from 2019 to the first quarter of 2023 provided by a major financial lender in Mississippi, I assess the relationship between financial and real estate buyers and agricultural land prices. Grantor and grantee information in the data allowed me to classify buyers into individuals, non-individual agribusinesses, and financial and real estate buyers. A hedonic pricing model is used to explore the relationship. The study concluded that the buyer type of agricultural land matters. More specifically, financial and real estate buyers pay a premium more than individuals and agribusiness buyers.

Optimization Of Punicalagin-Releasing In Situ Forming Microparticles (Prism) For Treatment Of Osteoarthritis, J. Alejandra Amaya

Theses and Dissertations

Osteoarthritis (OA) is characterized by inflammation and degradation of articular cartilage, of which disease-modifying therapies are limited. Punicalagin (PUN), a polyphenol with cartilage-protective and anti-inflammatory properties, has inhibitory effects on matrix metalloproteinase-13 and pro-inflammatory cytokines. This study aims to optimize formulation of punicalagin-releasing in situ forming microparticles (PRISM) by varying polymer concentration, polymer ratio, solvent ratio, and oil-to-polymer ratio. Design of Experiment (DoE) software was used to generate 25 formulations. PRISM was created by emulsifying the polymer/drug solutions in sesame oil. Drug release data was measured via optical absorption readings and particle size determined by both scanning electron microscope (SEM) …

Comparative Analysis Of Spray Pattern Deposition In Commercial-Off-The-Shelf (Cots) U.S.-Manufactured Uncrewed Aerial Application System (Uaas), James Mackey Ikerd Ii

Theses and Dissertations

Uncrewed aerial application systems (UAAS) are increasingly used for agricultural spraying, but spray deposition uniformity and effective swath width can vary between platforms. This study evaluated spray-pattern deposition and effective swath width for two commercial off-the-shelf (COTS) UAAS platforms during manual and autonomous flight operations. Manual, single-pass testing was used to assess preliminary performance and spray characteristics for both UAAS. Further autonomous multi-pass and single-pass evaluations were conducted to assess deposition uniformity and in-swath variability for both UAAS utilizing two methods of evaluation: Operation Self-regulating Application & Flight Efficiency (S.A.F.E.) pattern testing for manual flight evaluation and the Swath Gobbler …

They Not For Us: Reimagining Social-Emotional Learning For Black Youth, Jennifer Chinecherem Ani

Theses and Dissertations

Social-emotional learning (SEL) interventions are often implemented within a Positive Behavioral Interventions and Supports framework and have been found to be effective in improving students’ social, emotional, behavioral, and academic outcomes. However, SEL interventions are typically implemented as a Tier I intervention and there is limited research on SEL interventions implemented in Tier II. Additionally, SEL interventions have received criticism for not being culturally relevant for minoritized populations, especially Black students. This study aims to seeks to extend the current literature on making cultural adaptations of an SEL intervention, specifically for Black elementary students using the Ecological Validity Model (EVM). …

Development Of A Gis-Based Research Data Preservation Platform For Historically Significant Wood Preservative Research Field Sites, Lorali Gene Pace

Theses and Dissertations

Wood protection research plots have played a critical role in the development and evaluation of preservative treatments used throughout North America, including decades of research associated with Mississippi State University’s Department of Sustainable Bioproducts. However, without spatial documentation, much of this research history and institutional knowledge is at risk of being lost. This study develops a GIS-based research preservation platform to document, organize, and preserve historic wood protection testing data. Using ArcGIS Pro, field-collected spatial data, historical records, aerial imagery, and ArcGIS Online technologies, a digital geodatabase and interactive web application were created to organize research locations and connect them …

An Evaluation Of Three Remote-Sensing Technologies Applied To French Colonial Fort St. Pierre, Mariah Gonzales

Theses and Dissertations

This research is focused on the eighteenth century French Colonial Fort St. Pierre located in the Lower Mississippi Valley. Fort St. Pierre stood from 1719 to 1729 before being destroyed as a result of the Natchez revolt. With such a short existence, this fort has not been the subject of much research. With no archaeological features on the surface, the site was chosen to employ three remote-sensing methods to build the first digital rendering of the site and to measure the efficacy of each method in archaeological investigations. This study used LiDAR, Ground Penetrating Radar, and Magnetic Gradiometry to identify …

A Comparative Study Of Synthetic Aperture Radar Focus Algorithms For Maritime Surveillance Applications, Madison M. Forrest

Theses and Dissertations

Maritime Synthetic Aperture Radar (SAR) imagery is frequently degraded by vessel motion and ocean-induced dynamics that violate the stationary scene assumptions of conventional SAR image formation, resulting in azimuth defocus and reduced image interpretability. Autofocus techniques are commonly employed to mitigate these effects; however, their relative performance in maritime environments and the tradeoffs between image quality and computational complexity remain areas of ongoing investigation. This work presents a comparative evaluation of three established SAR autofocus algorithms—Phase Gradient Autofocus (PGA), Minimum Entropy (ME), and the Doppler Parameter Estimation Algorithm (DPEA)—applied to real-world maritime SAR imagery. The study utilizes X-band SAR data …

Elementary Preservice Teachers’ Use Of Representations To Compare Fractions In Area, Length, And Set Contexts, Sarah Salisbury

Theses and Dissertations

Mathematics teachers’ knowledge of rational numbers is very important due to the prominence of fraction concepts across the K-12 curriculum. Preservice teachers (PSTs) typically only have a procedural understanding of fractions and lack conceptual understanding (Newton, 2008). PSTs struggle to construct pedagogical representations that correctly show the size of parts and wholes (Lee & Lee, 2019). The purpose of this study was to investigate PSTs’ ability to compare fractions by examining their selection and creation of appropriate and accurate fraction representations in context, including the use of area, length, and set representations. The purpose was also to determine the extent …

Development And Comparison Of Retained Ownership Decision Methodologies For Feeder Cattle Owners, William John Simmons

Theses and Dissertations

Cattle producers retain ownership through the feeding phase in the hopes of increasing profits. Because not all cattle generate positive profits, retention decisions on an individual basis substantially affect overall profitability. This study develops, simulates, and evaluates among others a new prediction methodology intended to help improve profitability. The method is an integrated framework combining a novel multilevel (hierarchical) growth model, futures basis-adjusted price forecasting, and production cost estimation to predict which animals are expected to be profitable. Individual performance data were collected for 12,066 in-sample (2003 to 2011) to predict growth and profits for 12,496 out-of-sample cattle (2011 to …

Toward Secure Genomic Intelligence: Privacy-Preserving Deep Learning Frameworks For Cancer Classification And Collaborative Analysis, Yibo Dong

Theses and Dissertations

Genomic data contains highly sensitive personal information, yet cancer classification and collaborative medical research increasingly depend on sharing such data across institutions. Existing privacy-preserving approaches for deep learning, including differential privacy (DP) and standard federated learning (FL), leave critical vulnerabilities: DP degrades model utility through noise injection, while FL relies on a trusted aggregation server that remains susceptible to gradient-based attacks. This dissertation develops, evaluates, and optimizes a series of privacy-preserving deep learning frameworks specifically designed for genomic cancer classification. First, a systematic benchmarking study evaluates DP, FL, and fully homomorphic encryption (FHE) across three deep learning architectures (fully connected …

Resource-Conscious Care: Time To Pregnancy And Iui Cycle Outcomes In Female Same-Sex Couples, Lea George, Devika Sachdev, Kassie Bollig

Department of Medicine Faculty Papers

RESEARCH QUESTION: Does the clinical pregnancy rate (CPR) for the first cycle, time to pregnancy, and cumulative CPR up to six consecutive cycles differ between female same-sex couples undergoing intrauterine insemination (IUI) alone and those undergoing IUI with ovarian stimulation?

DESIGN: This retrospective cohort study evaluated 554 female same-sex couples undergoing IUI alone (n = 264) or IUI with ovarian stimulation (n = 290) at a single centre using cryopreserved donor spermatozoa from January 2012 to January 2022.

RESULTS: Overall, CPR for the first cycle was 17.9% (99/554). In adjusted analyses, there was no significant difference in CPR in IUI …

Instruction Guide, Mark C. Hall

Analytical Biochemistry: A Practical Handbook for Undergraduates

The instruction guide provides useful information for setting up and running the lab activities each week and assessing student preparation, performance, and comprehension.

Palmer Amaranth (Amaranthus Palmeri) Seedbank Decay And Susceptibility To S-Metolachlor And Glufosinate In Mississippi, Nestor Cordero

Theses and Dissertations

Palmer amaranth (Amaranthus palmeri S. Watson) is one of the most troublesome herbicide-resistant weeds in U.S. agriculture. This study evaluated (1) seed persistence across soils collected from major row-crop production areas in Mississippi by investigating the influence of soil physicochemical and microbial properties on seed viability and (2) the prevalence of resistance to S-metolachlor and glufosinate among Mississippi populations. A seed burial experiment using soils from 57 locations representing 10 counties showed that seed viability declined substantially between 4 and 6 months after burial. Although soil physicochemical properties were associated with variation in seed viability, no single factor consistently explained …

Profiles Of Body Image In Emerging Adults And Associations Across Sociocultural Influences, Alligrace Story

Theses and Dissertations

The Tripartite Influence Model of body image suggests that multiple sources of appearance-related pressures (i.e., family, peers, significant others, and media) impact body image and disordered eating behaviors via appearance-related comparisons and internalization of body-related ideals (i.e., thin-ideal internalization and muscular-ideal internalization). Previous research has shown support for the Tripartite Influence Model of body image among various demographic groups. The current study identified and examined profiles of emerging adults based on their reported body esteem and body appreciation. Body esteem was measured using the Body Esteem Scale for Adolescents and Adults (BESAA; Mendelson et al., 2001), and body appreciation was …

Tips For Higher Education: A Research-Informed Framework For Designing Trauma-Informed Professional Support Practices In Higher Education, Kelli Wallace

Theses and Dissertations

This capstone project addresses the need for structured trauma-informed professional preparation within higher education as institutions continue responding to increasing student adversity, trauma exposure, mental health concerns, and barriers to academic engagement and persistence. The purpose of the project is to develop Tips for Higher Education: A Research Informed Framework for Designing Trauma-Informed Professional Support Practices in Higher Education. The project examines the research-supported elements that should be included in a trauma-informed professional preparation framework, the competencies and learning domains needed by faculty, advisors, and student-support professionals, and the ways professional learning should be structured and sequenced to support sustainable …

Ethnic Identity And Career Adaptability Among African American High School Students: Exploring The Roles Of Perceived Barriers And Social Support, Zion J. Kamau

Theses and Dissertations

African Americans are subjected to systemic racial discrimination and bias in the labor market. Data on labor force participation collected by the U.S. Census Bureau between 1970 and 2010 were investigated for the purpose of identifying trends, and it was found that race and ethnicity significantly influence an individual's labor market position and employment outcomes (Byars-Winston et al., 2014). African Americans were more likely to hold positions earning less, requiring fewer skills, and associated with a lower social status. There is a misconception that the phenomenon occurs only in adulthood, but it is also observed during adolescence. The U.S. Bureau …

Wellness In The Workplace: An Assessment Of The Mississippi State University Extension Service Workplace Environment And Its Effect On Employee Mental Health And Overall Wellbeing, Tashmia S. Prowell

Theses and Dissertations

The purpose of this study was to identify perceived stressors within the Mississippi State University Extension Service (MSU-ES) workplace environment and to determine the impact of these stressors on employee mental health and overall wellbeing. This study utilized a descriptive, cross-sectional research design collecting data through a quantitative web-based survey developed in Qualtrics and adapted from the NIOSH Worker Wellbeing Questionnaire. To examine the research questions and hypothesis guiding this study, quantitative data were analyzed using Stata MP 19.5. After a data scrub, 213 usable responses were yielded. Associations between variables were examined using descriptive and inferential statistical methods. The …

The Role Of Latinx And Hispanic Identity In The Presentation Of Hoarding Symptoms, Caitlyn Ashley Nix

Theses and Dissertations

Although people who identify as Hispanic and Latinx make up approximately 19% of the United States population (U.S. Census Bureau, 2023), most research into hoarding disorder is comprised of White, non-Latinx samples. Thus, the current study investigated Hispanic and Latinx ethnicity as a predictor of several facets of hoarding disorder. Previous literature has shown lower risk for Hispanic and Latinx individuals in terms of several physical health outcomes when compared to individuals of similar socioeconomic status (Markides & Coreil, 1986), though mental health outcomes have more variation by subgroup (Barragán et al., 2020). Previous research has also shown that collectivistic …

Enhancing Social Emotional Learning Interventions For Black Adolescent Girls Through Staff Training, Shundrell Mcmullan

Theses and Dissertations

Black girls often face systemic inequities rooted in discriminatory practices and policies in the educational system contributing to adverse social-emotional outcomes unless mitigated by intentional protective supports. Many schools have adopted social emotional learning (SEL) programs; however, their effectiveness for culturally diverse students are often challenged. The present study examined the impact of Sisters of Nia, a race-conscious and gender-responsive intervention designed to enhance protective factors and social-emotional well-being among six adolescent Black girls. Student outcomes, including academically engaged behaviors and positive peer interactions, were primarily evaluated using a single-subject A/B design. Students’ self-esteem and racial identity were also measured …

School Administrators’ Lived Experiences In Educational Settings Supporting Students With Exposure To Violence, Craig Karnell Chapman

Theses and Dissertations

Violence in schools and communities presents persistent challenges for K–12 students, educators, and school leaders, particularly in high-poverty contexts where exposure to violence disrupts teaching, learning, and school climate. Guided by Bronfenbrenner’s Ecological Systems Theory (1979). Ecological systems theory, this phenomenological study explored the lived experiences of school administrators in supporting students exposed to violence in their schools and communities. Data were collected through semi-structured interviews with five purposively selected school administrators working in high-poverty districts and analyzed using thematic analysis. Findings revealed four central themes: (a) instructional instability resulting from persistent exposure to violence, (b) the spillover of community …

A Descriptive Quantitative Study Of Non-Traditional Parental Student Support Structures In Texas Community Colleges, Caitlin Connolly

Theses and Dissertations

The purpose of this descriptive quantitative study is to determine the type and distribution of parental student support services available at Texas public community colleges, using data collected from the fall of 2024 and 2025. This study was conducted using secondary archival quantitative data from the Texas Higher Education Coordinating Board (2024), Texas Comptroller of Public Accounts (2024), Texas Association of Community Colleges (2025), National Student Clearinghouse (2025), U.S. Department of Education (2025), and Texas community college websites. The study collected the following concerning the 52 public Texas community colleges: location, enrollment, student support services available (e.g. campus childcare, family …

Carbon Dioxide Capture, Utilization, And Storage: A Comprehensive Overview, Katheryn Bailey

Theses and Dissertations

The average global surface temperature is rising, with the 20th-century average being 2.63˚F/1.46˚C above the pre-industrial average, 56.7˚F/13.7˚C. Therefore, research into CO2 capture technology is being explored and implemented as a method to reduce greenhouse gas emissions. The main methods of CO2 capture are pre-combustion, post-combustion, oxy-fuel combustion, and direct air capture. These processes utilize solvent-based absorption, adsorption, membrane separation, and chemical looping combustion to separate CO2 from the exhaust gas. Implementation of this technology can come with increased: material cost, energy penalty, and CAPEX depending on the separation technique, existing equipment, inlet CO2 concentration, and partial pressure, etc.. Financial …

Latent Profile Analysis Of Trauma Appraisal: Associations With Psychological Problems And Substance Use Moderated By Emotion Dysregulation In College Students With Trauma History, Tram Nguyen

Theses and Dissertations

Empirical research suggests that trauma-related appraisals have significant mental health implications. A prior meta-analysis reported that maladaptive trauma-related cognitions play a central role in the development and maintenance of poor coping strategies (i.e., substance use) and posttraumatic stress disorder. However, less is known about the relationships among maladaptive trauma cognitions, emotion dysregulation, and risk for substance use. The current study sought to provide a comprehensive examination of the relationships among trauma appraisals, emotion dysregulation, psychological problems, and substance use. A systematic review highlighted the lack of a person-centered approach to trauma appraisal research, as well as a lack of research …