Digital Commons Network^™

Investigating The Effects Of Multiple Concussions On Neuropsychological Performance, Michaela S. Patoilo

Theses and Dissertations

It has been well-established in the literature that a history of concussion makes individuals more susceptible to sustaining subsequent concussions. However, there is little neuropsychological evidence of how sustaining multiple lifetime concussions affects cognitive functioning in the general adult population. It is known from previous traumatic brain injury and single concussion literature that impairments in cognitive performance across domains often follow the initial injury, and exploratory studies have shown that multiple concussions can have a measurable impact on cognition. However, existing research is often limited by its reliance on archival data and abbreviated neuropsychological batteries. Therefore, the current study aimed …

Predictions Of Thermo-Fluid Transport Over A Poultry Incubation Period Using High Performance Computing, Melvy Fernandes

Theses and Dissertations

The quality of hatchery conditions significantly impacts the hatchling health. An insight into the spatiotemporal distribution of environmental factors like temperature, ventilation, humidity, and CO2 within an incubator can be the key to reduce the pathogen spread. The objective of this study is to develop an efficient computational fluid dynamics model to predict thermo-fluid and scalar transport over an incubation period using high performance computing systems. Various modeling approaches for grid generation, inflow conditions, fan and heater modeling, and scalar transport are evaluated to identify cost effective numerical models and allow long time simulations with reliable data. The model is …

Using Phylogenomics And Environmental Metabarcoding To Understand The Distribution And Evolutionary Histories Of Amoebae, Robert E. Jones

Theses and Dissertations

Protists are defined as eukaryotic organisms that are not animals, land plants, or fungi and make up the vast majority of eukaryotic diversity. Unfortunately, they are often overlooked and under sampled. Some rationales behind this are that they are often microscopic, most rarely the cause of human disease, and are often difficult to get into culture. Molecular phylogenetics has revolutionized our understanding of the evolutionary history of eukaryotes and without a clear picture of protist evolution our understanding would be severely hindered. Phylofisher is an easy-to-use phylogenomic software package, with an accompanying database and various utilities, intended for deep phylogenomic …

Steric Tuning Of Hexadentate Chelates And Their Effects On The Stability And Redox Properties Of First-Row Transition Metals, Ryan Benjamin Gaynor

Theses and Dissertations

Chelation of first-row transition metals has many useful properties in the biomedical and industrial fields due to the stabilizing and/or property-altering effects that certain chelates can induce in these metals. One such useful design principle for these chelates is the addition of bulky steric groups which can have an added effect on these properties. Chapter I will explore the origins of these effects and show examples of how these effects are leveraged to produce useful complexes in a variety of applications. In Chapter II, we will discuss our choice of ligand design and the development of related synthetic procedures for …

Effects Of Cascading Optical Processes On Quantification Of Sample Scattering Extinction, Intensity, And Depolarization, Samadhi Nisansala Nawalage

Theses and Dissertations

Complex samples containing nanoscale or larger materials exhibit light scattering, a universal property of matter. However, the influence of scattering-induced cascading optical processes on quantifying sample scattering intensity and depolarization has not been thoroughly evaluated. This study uses polystyrene nanoparticles (PSNPs) as a model analyte for systematic experimental and computational investigation. It aims to elucidate the effects of cascading optical processes on scattering cross-section, molar coefficients, depolarization, and intensities. A theoretical model is introduced to show how the Beer-Lambert law is complicated by forward-scattered light interference in UV-Vis measurements. The dependence of scattering intensity on concentration and particle size is …

Contention Resolution With Collision Cost, Umesh Chandra Biswas

Theses and Dissertations

Contention resolution coordinates access to a shared communication channel divided into synchronized slots. For any fixed slot, a packet can be sent, leading to three outcomes: empty (no packet sent), successful (one packet sent), or collision (multiple packets sent). Each slot provides ternary feedback: empty, successful, or collision. Much of the prior work has mainly focused on optimizing the makespan, the number of slots needed for all packets to succeed. However, in many modern systems, collisions also incur time costs, which existing algorithms do not address. In this thesis, we design and analyze a randomized contention-resolution algorithm, Collision-Evasion Backoff, that …

Unraveling Catalytic Mysteries: Insights Revealed By Density Functional Theory, Tri Nghia Le

Theses and Dissertations

Density functional theory (DFT), a powerful toolbox, can unveil chemical transformations in detail. This dissertation focuses on exploring catalytic puzzles, deciphering experimental results, and occasionally, reevaluating conventional concepts. In the first problem, a combination of DFT and kinetic studies uncovers the hidden role of borane in directed borylation reactions catalyzed by iridium complex. Borane, initially considered a side product, is revealed to be an autocatalyst. Chiral catalysts are pivotal for achieving asymmetric molecular construction. However, when the chirality center in the catalyst changes with each turnover, what impact does this have? In our second investigation, we delved into a thorough …

A Random Forest Model For Predicting Soil Properties Using Landsat 9 Bare Soil Images, Ivo Tokeshi Muller

Theses and Dissertations

Digital soil mapping (DSM) provides a cost-effective approach for characterizing the spatial variation in soil properties which contributes to inconsistent productivity. This study utilized Random Forest (RF) models to facilitate DSM of apparent soil electrical conductivity (ECa), estimated cation exchange capacity (CEC), and soil organic matter (SOM) in agricultural fields across the Lower Mississippi Alluvial Valley. The RF models were trained and tested using in situ collected ECa, CEC, and SOM data, paired with a bare soil composite of Landsat 9 imagery. Field data and imagery were collected during the study period of 2019 through 2023. Models ranged from fair …

Alight, The Dead Of Night: Ascertaining The Collection And Use Of Nighttime Site Inventory In Landscape Architecture Professional Practice, Jacob Zachary Felkins

Theses and Dissertations

In landscape architecture, site inventory is a common precursor and perpetual informant of site design, toolkit development, and best management practices. Within inventory-specific texts, inventory is primarily geared, collected, and applied toward the daytime, and thusly, one might consider the bulk of inventory to be “daytime inventory” which pays greater heed to a diurnal humanity and lesser heed to the nocturnal world. With a greater attention to nighttime site conditions, we explored “nighttime inventory” through a series of primary considerations - nighttime lighting, light pollution, site ecology, and the night sky – along with several secondary considerations. We then surveyed …

Architecture Selection And Propulsion Supervisory Control Strategies For All-Wheel Drive Electric Vehicles (Evs), Jagdeo S. Singh

Theses and Dissertations

The automotive industry is shifting towards the development of electric vehicles (EVs) at a rapid pace with most manufacturers intending to be producing solely electric vehicles by 2050. This is due in large part to government regulations aiming to reduce emissions from the transportation sector. As a result, significant research is being conducted to advance the development of EV propulsion technology. This research explores two aspects of EV design: the analysis and selection of an efficient EV propulsion architecture, and the implementation and testing of an efficiency-based energy management strategy (EMS) for implementation on Mississippi State’s EcoCAR team vehicle for …

Complexities In Datura Production And Ceramics In The Arkansas River Valley, Jaylyn Ashley Gustafson

Theses and Dissertations

Plants and ceramics play a crucial role in many Indigenous cultures, used in food preparation and rituals. Datura is a plant found in the Southeast and is known for its medicinal and hallucinogenic properties. The Indigenous cultures that used Datura in their rituals had to develop an understanding of the plant and how to use it. Datura contains specific alkaloids, which are used for medicinal purposes but can be lethal if consumed incorrectly. Being aware of the danger of consuming Datura incorrectly, the Indigenous people had to create a system of extracting the hallucinogenic properties for their ritual and medicinal …

The Impact Of Stimulus Set Size On Efficiency Of Sight Words Training, Junchen Guo

Theses and Dissertations

Reading skills are widely recognized as fundamental abilities, crucial not only for academic success but also for participation in social activities and navigating interpersonal challenges. In the early formation of reading abilities, mastery of sight words is instrumental in effectively enhancing reading proficiency, particularly for individuals lacking foundational reading skills. In educational practice, flashcard intervention stands as a widely utilized instructional approach. When Kodak et al. (2020) first introduced the concept of stimulus set size and its impact on the efficiency of skill acquisition interventions, they examined differences in training efficiency among children with autism spectrum disorder (ASD) when exposed …

Boundary Layer Flow Control In Low-Reynolds Numbers Via Internal Acoustic Excitation, Joshua Michael Kiley

Theses and Dissertations

Aerodynamic flow control using internal acoustic excitation holds promise as it combines the simplicity of passive flow control techniques (in terms of added weight and operational complexity) with the control authority of active flow control methods. While previous studies have analyzed the effects of acoustic excitation on steady wing aerodynamics, the effect of excitation on the unsteady aerodynamics is not known, which is the aim of the current effort. Internally mounted speakers on a symmetric National Advisory Committee for Aeronautics (NACA) 0012 wing are used to excite the unsteady boundary layer at the wing’s leading edge as it executes linear …

A Graphical User Interface Application For Querying The Unmanned Aerial System Integration Safety And Security Technology Ontology, Matthew Richard Beach

Theses and Dissertations

Unmanned aerial systems (UAS) have become wildly popular over the past decade. With the increased demand of these systems, it is imperative for agencies such as the Federal Aviation Administration (FAA) to integrate rules and regulations of UAS into the National Airspace System (NAS). In 2023, a UAS Integration Safety and Security Technology Ontology (ISSTO) was developed in the Web Ontology Language (OWL) to aid in this integration. To further aid UAS integration into the NAS, it becomes necessary to develop methods for training new pilots, air traffic control operators, drone operators, etc. This paper proposes a query application that …

Application Of Existing Statistical Models To Thermal Inactivation Of Escherichia Coli In A Lab-Based Circulating Water Bath And Investigation Of A Salmonella Challenge Model In A 42-Day Broiler Grow-Out In An Updated Facility, Michael Carroll

Theses and Dissertations

The Food Safety Modernization Act has enforced the importance of research in preventative and control measures for known hazards. Experiment 1 applies existing statistical models, Linear and Weibull, to Escherichia coli thermal inactivation in broiler mash feed in a lab-based circulating water bath to simulate conditioning. Linear and Weibull models were determined to be suitable for modeling the thermal inactivation of E. coli in broiler feed. In Experiment 2, a Salmonella challenge model for broilers raised in floor pens in the updated Animal Biosafety Level-2 facility was evaluated over a 42-day grow-out period. Broiler performance and recovery of Salmonella from …

Creating A Chronology Of Claiborne (22ha501): Revisiting And Revising Radiocarbon Assays Of A Poverty Point Site, Olivia Catherine Baumgartel

Theses and Dissertations

The Claiborne site in Hancock County, Mississippi has been considered part of a culture within Poverty Point’s control since it’s discovery in the 1950’s. In this study, I sampled and ran new five new radiocarbon dates from the collections at Mississippi State University. I then created a chronometric hygiene scale, ranked the new and current dates, removed dates from models that did not have the criteria needed to continue. This thesis created a new chronology for the site, placing it within the timeline of Poverty Point but also related it to the Archaic shell mounds in Southeastern North America.

Here I Am, Like I Am: Disability In Twentieth-Century Southern Literature, Rachel M. Bell

Theses and Dissertations

The depiction of people with disabilities in American literature has varied considerably throughout the twentieth century. In the south in particular, disabled individuals have been portrayed as violent, licentious, and deceitful. This thesis examines three hallmarks of American southern literature—Harper Lee’s To Kill a Mockingbird, William Faulkner’s Sanctuary, and the short stories of Flannery O’Connor—to demonstrate the anxiety of that era surrounding disability, as well as how disability works in tandem with race and class. The fixation of these works on the sexual immorality of disabled men reflects the fascination with eugenics in the mid-twentieth century, as do their animalistic …

Longitudinal Influences Of Parental Relationships On Positive Adolescent Functioning, Rebekah Buckley Sparks

Theses and Dissertations

This dissertation examines the longitudinal influences of parental relationships – romantic, co-parenting, and parent-child – on positive adolescent functioning. Utilizing data from the Future of Families and Child Wellbeing Study, this study investigates how various dimensions of parental relationships impact adolescent well-being at age 15, as measured by the EPOCH scale. Grounded in Attachment Theory and the Life Course Perspective, this research highlights the interconnectedness of early parental interactions and their long-term effects on adolescents’ emotional and social development. Key findings indicate that supportive and stable parental relationships significantly enhance adolescents’ engagement, perseverance, optimism, connectedness, and happiness. The study emphasizes …

Effects Of An Auditory Versus Visual Stimulus On Reaction And Response Time During Countermovement And Squat Jumps, Russell K. Lowell

Theses and Dissertations

This investigation examined the differences in REACT, RT, and jumping performance for the countermovement jump (CMJ) versus squat jump (SJ) when beginning the movement by responding to auditory (AUD) versus visual (VIS) stimuli. The secondary purposes of this investigation are to examine gender and physical activity level differences of the aforementioned metrics and the relationship between maximal strength, REACT, and RT. Twenty-eight participants (females = 16 and males = 12) were split into three groups (low = 6, moderate = 10, and high = 12) based on their perceived physical activity levels in accordance with ACSM physical activity requirements. Over …

Exploring Co-Manipulation Via A New Decomposition Of Interaction Force And An Exploration Of Signal Space In Multi-Agent Motion Primitives, Kody Blaine Shaw

Theses and Dissertations

Co-manipulation is when two or more people work together to move an object. In this work, we consider the physical co-manipulation of objects that are large and heavy enough that they are more easily handled by two or more participants. We currently lack a fundamental understanding of how people perform such tasks together, both the basic signals they use to communicate and how those signals are mapped to actions and behaviors. This work builds upon the existing body of knowledge to improve our understanding of physical co-manipulation. Specifically, interaction forces are often considered a key method for information transfer in …

Shadow Of Death: Mortality In The Mythological Art Of Nicolas Poussin, William Whitledge

Theses and Dissertations

For this thesis I look at six works by Nicolas Poussin, Venus and Adonis (c. 1627-1630), Narcissus and Echo (c. 1630), Landscape with Man Pursued by Snake (c. 1637), Landscape with Man Killed by Snake (c. 1648), Landscape with Orpheus and Eurydice (c. 1648-1650), and Landscape during a Thunderstorm with Pyramus and Thisbe (c. 1651). I explore the themes of mortality and the concept of inevitable death as it is emphasized by the choices of subject matter, the composition of the works, and the use of light in the works. Through extensive visual analysis and research of the current body …

Disability And News: How Audiences Respond To Disabled Messengers In A Newcast, Daniel J. Andersen

Theses and Dissertations

Starting in the 1960s, many communications theories sprung to life in response to social movements that thrived in that era. While those theories were applied to movements such as gender equality, the equal rights movement, and racial and ethnic minority recognition efforts, the disability community has largely been left outside of academic exploration. Building off of decades of stereotype and representation research within communications psychological theories, this study used eye tracking to understand how audiences respond to seeing disabled newscasters. Using quantitative analysis and experimental design to expose participants to a news anchor in a wheelchair, this study built off …

Exploring The Link Between Travel Behavior And Mental Health, Emily Kae Youngs

Theses and Dissertations

This study explores the critical link between travel behavior and mental health, focusing on young adults who have expressed suicidal ideation. By analyzing how daily activities and movement patterns impact mental well being, the research aims to explore travel related mental health approaches for individuals. The importance of this work lies in its potential to improve the quality of life for individuals by informing more personalized and effective mental health strategies. Through comprehensive data analysis and statistical modeling, the research aims to uncover insights into how travel behavior influences motivation levels and mental well-being across different neurological and physiological groups. …

A Social Ecology Model For Social Determinants Of Health As Psychosis Risk Factors, Katie Beck-Felts

Theses and Dissertations

Social determinants of health (SDOHs) significantly impact psychosis risk beyond heritability. However, there is a need for an organizing framework to observe how these diverse elements concurrently predict psychosis risk. This study examines SDOHs as psychosis risk factors using a four-level model, aligned with Bronfenbrenner's social ecology theory. The study aims to assess the proposed model’s ability to predict psychosis risk. Specifically, it is hypothesized that each socioecological level of the model would predict psychosis risk with more proximal SDOHs (e.g., individual level vs community) exhibiting stronger predictive power, aligning with Social Ecology theory. College students (N = 210) completed …

Defensiveness And Accountability In Couple Relationships: A Constructivist Grounded Theory Analysis, Collin Joshua Wright

Theses and Dissertations

Defensiveness is empirically well documented as a factor in breakup and divorce which have wide ranging consequences for adults and affected children, however, little research exists on what Gottman has called the antidote to defensiveness which is taking an accurate amount of accountability. The purpose of this study was to use qualitative methods to illuminate the microprocesses which take place between partners in interactions regarding accountability and defensiveness. The data was taken from part of a larger project on healthy and unhealthy relationships where semi-structured interviews were conducted from a diverse sample recruited through convenience and theoretical sampling. Constructivist grounded …

Exploring The Role Of Rb1 In Cellular Differentiation Using Patient-Derived Stem Cells, Ambily Vincent

Theses and Dissertations

The Retinoblastoma (RB1) gene, predominantly recognized as a tumour suppressor, plays a crucial role in early growth and development. Mice lacking the retinoblastoma gene do not survive and exhibit defects in the differentiation of various tissues, underscoring its involvement in cellular differentiation. This suggests that the functions of the RB1 gene extend beyond its role as a tumour suppressor, encompassing cell cycle regulation, maintenance of genomic stability, cellular senescence, and cellular differentiation.

While the tumour suppressor function of the RB1 has been extensively studied, its role in cellular differentiation remains incompletely understood. Existing literature, primarily based on animal models, has …

Quantifying The Influence Of Air Resistance And Drafting On The Metabolic, Kinematic And Kinetic Demands Of Running, Jared Robert Deandreis Steele

Theses and Dissertations

Purpose: This study aimed to quantify the effects of air resistance on metabolic, kinetic, and kinematic parameters during treadmill running and to investigate how drafting influences these parameters. Methods: Thirty-three well-trained distance runners participated in biomechanical assessments, and seventeen of these also participated in metabolic assessments. The protocol involved running at 80-85% of critical speed on a force-instrumented treadmill facing a wind tunnel. Five wind conditions were tested: no fan (NF), headwind (HW), headwind with drafting (HWD), no wind (NW), and no wind with drafting (NWD). Ground reaction forces (GRF) and kinematic data were collected and analyzed using linear mixed-effects …

Chronic Stress And Well-Being: Testing Mindfulness As A Proposed Method To Decrease Stress In Parents Of Children With Autism Spectrum Disorder, Madeline M. Gillies

Theses and Dissertations

Parenting is a demanding role that encompasses many responsibilities and challenges. When a child is diagnosed with autism spectrum disorder, there are additional demands on the parent's time, energy, and financial resources, which likely leads to increased levels of chronic stress for parents. This dissertation examines the differences in chronic stress levels between parents who have children with autism and parents who do not, using hair cortisol concentration (HCC) as a benchmark. This dissertation also explores reducing parental stress by introducing a mindfulness intervention. Participants (n = 68) were recruited and divided into two groups: Parents of children who have …

Engineering Cell-Free Protein Synthesis Biosensors For Point Of Care Use, Tyler Jordan Free

Theses and Dissertations

Diagnostic tests can dramatically improve and save lives. Survival rates and patient outcomes related to cancer and other diseases can be improved when routine testing guides personalized treatment. Highly accurate laboratory tests exist for thousands of biomarkers, including those of interest in this dissertation, but cost and complexity limit access to life-saving lab tests in many cases throughout the world. To fill this need and increase accessibility of diagnostics, in this report we report our engineering advancements towards portable biosensors for colorimetric detection of glutamine, endocrine disrupting compounds (EDC), and pathogenic RNA which are key biomarkers in cancer treatment monitoring, …

Systematic Review Of Digital Activity Schedule Use In Individuals With Autism And Intellectual Disability, Adelaide Wahlquist Hammond

Theses and Dissertations

The purpose of this systematic review of using digital activity schedules as an intervention in individuals with autism spectrum disorder and intellectual disabilities is to determine to what extent the current research shows it to be an effective intervention. For articles to be included in this review, they had to use a digitally presented activity schedule, the activity schedule could not be a task analysis of a single activity or a group visual schedule, and the intervention must have been carried out with individuals with autism or intellectual disabilities. Studies meeting the inclusion criteria totaled 17 studies with a total …