Digital Commons Network^™

Environmental Assessment Of Biomass/ Torrefied Biomass And Waste Coal Co-Fired Power Plants With The Incorporation Of Carbon Capture And Storage Technologies, Surja Sarkar

College of Graduate Studies: Theses & Dissertations

Climate change is a worldwide problem that has recently garnered significant attention in recent years. While widespread emissions of greenhouse gases, mainly CO₂, from the combustion of fossil fuels, contribute to global warming, biomass-based heat and electricity generation, on the other hand, is rapidly growing due to its smaller carbon footprint, aiding in attaining the goal of zero carbon emissions. In this study, the environmental assessment of the waste coal and biomass/ torrefied biomass co-fired power plants was completed using the life cycle assessment (LCA) methodology through the performance assessment of the co-fired power plants using the commercial …

Concentration Effects Of Ytterbium(Iii) Ions On The Physical, Structural, Thermal, And Optical Properties Of Barium Phosphate Glasses, Richard Amesimenu

College of Graduate Studies: Theses & Dissertations

Ytterbium(III)-doped glasses are widely known for their application in near-infrared (NIR) lasers and nowadays attract attention for solar spectral conversion in photovoltaic cells. In this study, the effects of ytterbium(III) concentration on the physical, structural, optical, and thermal characteristics of Yb-doped phosphate glasses were investigated. The glasses were synthesized using the melt-quenching technique with nominal compositions of 50P₂O₅:(50 – xBaO):xYb₂O₃ (x = 0, 0.5, 1.0, 2.0, 3.0 and 4 mol%). The properties were then examined by density and related parameters, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform-infrared …

Examining The Moderating Effect Of Self-Compassion Between Rumination And Alcohol Use, Victoria Forgea Allen

College of Graduate Studies: Theses & Dissertations

Abundant research suggests alcohol use among college students as a public health concern (SAMHSA, 2014). Previous studies support rumination, a manner of responding to emotional distress which involves repetitively and passively focusing on the distress, is linked to problematic alcohol use among college students (Oswalt et al., 2020). On the other hand, not all college students who experience rumination engage in problematic alcohol use which suggests the presence of a moderating variable. Due to its emotion regulating abilities and positive associations to well-being, self-compassion may be on factor that affects the relationship between rumination and alcohol use (Diedrich et al., …

Psychotherapist Awareness And Competence Managing Social Media Concerns, Jing Wen Ong

College of Graduate Studies: Theses & Dissertations

Social media use increased substantially in recent years, spurring the growth of research focused on its association with mental health. Previous research examined the relationship between positive and negative aspects of mental health and social media use. Other studies explored the relevance of social media to professional practice of psychologists including the use of social media to reach populations with limited access to mental health services and ethical dilemmas arising from social media use; however, there is limited understanding of the pertinence of social media to concerns that clients discuss in therapy and therapist competence in handling these discussions. The …

Social Support In Black Individuals: The Moderating Effects On The Relationship Between Resilience And Well-Being, Imani Elise Crosby

College of Graduate Studies: Theses & Dissertations

Black individuals possess numerous strengths and positive contributions that build strong communities and cultivate psychological well-being (Biglan et al., 2012). However, much of the current literature focuses on hardships Black individuals face, skewing the larger discourse of their lived experience. This exclusive focus on adversity often neglects pathways by which Black people thrive and flourish. It is important to consider how Black experiences relate to a sense of well-being. Resilience, or the ability to “bounce back” from adverse experiences is linked well-being outcomes (APA, 2012). However, it is unknown whether the promotive effects of resilience directly contribute to well-being outcomes …

Characterization Of Nasa Cold Atom Laboratory Potentials Using Variational Techniques, Samuel O. Oni

College of Graduate Studies: Theses & Dissertations

In a recent atom-interferometry (AI) experiment, conducted aboard the NASA Cold Atom Laboratory (CAL) deployed to the International Space Station (ISS), a Bose-Einstein condensate (BEC) was formed too near to the atom chip wall for the AI experiment to be carried out. To fix this the experimentalists tuned the CAL external magnetic field and atom-chip currents so as to move the BEC away from the atom-chip wall. They then planned to turn the trap off and allow it to expand in place (since there is no gravity on the ISS) in preparation for the AI experiment. Unfortunately, when the trap …

Reinforcement Learning: Applying Low Discrepancy Action Selection To Deep Deterministic Policy Gradient, Aleksandr Svishchev

College of Graduate Studies: Theses & Dissertations

Reinforcement learning (RL) is a subfield of machine learning concerned with agents learning to behave optimally by interacting with an environment. One of the most important topics in RL is how the agent should explore, that is, how to choose actions in order to rate their impact on long-term reward. For example, a simple baseline strategy might be uniformly random action selection. This thesis investigates the heuristic idea that agents will learn faster if they explore by factoring the environment’s state into their decision and intentionally choose actions which are as different as possible from what they have previously observed. …

Exploring The Consistency Of Flow Regimes Within And Among Ecoregions Of The Southeastern United States, Frank Paul Braun Iv

College of Graduate Studies: Theses & Dissertations

Human manipulation of river systems has long been a known contributor to the loss of freshwater biodiversity. By accounting for environmental causes of hydrologic variation among rivers, we can better understand how ecoregion mediates flow regimes and forecast species that may be at risk. Presumably, natural variation associated with ecoregion boundaries exerts strong influence on flow regimes, and may mediate relationships between other features (e.g., land use, dam operations) and hydrology. However, such between-ecoregion variation is poorly investigated, particularly at fine spatial and temporal scales. I characterized 10 hydrologic metrics, representing the five key dimensions of the flow regime (magnitude, …

The Effects Of Cultural Responsiveness And Therapy Duration On Black Americans’ Therapy Preference, Katilyn M. Ashley Treem

College of Graduate Studies: Theses & Dissertations

Marginalized groups are less likely to seek out mental health services than non-marginalized groups. There are various reasons why marginalized groups, such as Black Americans, are less likely to seek out mental health services, one of which is the cultural barriers between a clinician and client. Research suggests that Black Americans feel that clinicians struggle to overcome these cultural barriers. Therefore, it is important for clinicians to actively receive training on how to serve clients with diverse backgrounds. Cultural responsiveness, an extension from cultural competence, is the active application of the knowledge and skills obtained in training. Examining people’s therapy …

Screening H3 Histone Acetylation In A Wild Bird, The House Sparrow (Passer Domesticus), Daniella Ray

College of Graduate Studies: Theses & Dissertations

Epigenetic mechanisms are increasingly understood to have major impacts across ecology. However, one molecular epigenetic mechanism, DNA methylation, currently dominates the literature. A second mechanism, histone modification, is likely important to ecologically relevant phenotypes and thus warrants investigation, especially because molecular interplay between methylation and histone acetylation can strongly affect gene expression. There are a limited number of histone acetylation studies on non-model organisms, yet those that exist show that it can impact gene expression and phenotypic plasticity. Wild birds provide an excellent system to investigate histone acetylation, as free-living individuals must rapidly adjust to environmental change. Here, we screen …

Applications Of Predictive And Generative Ai Algorithms: Regression Modeling, Customized Large Language Models, And Text-To-Image Generative Diffusion Models, Suhaima Jamal

College of Graduate Studies: Theses & Dissertations

The integration of Machine Learning (ML) and Artificial Intelligence (AI) algorithms has radically changed predictive modeling and classification tasks, enhancing a multitude of domains with unprecedented analytical capabilities. Predictive modeling leverages ML and AI to forecast future trends or behaviors based on historical data, while classification tasks categorize data into distinct classes, from email filtering to medical diagnosis. Concurrently, text-to-image generation has emerged as a transformative potential, allowing visual content creation directly from textual descriptions. These advancements are pivotal in design, art, entertainment, and visual communication, as well as enhancing creativity and productivity. This work explores three significant studies in …

Exploring Collegiate Athletes' Experiences With Cliques, Cora G. Dodson

College of Graduate Studies: Theses & Dissertations

A significant body of literature examines team processes as they relate to the team as a collective unit (Eys et al., 2019). However, smaller units present within a team, such as cliques or subgroups, warrant further scientific exploration and dissemination (Wagstaff & Martin, 2018). Existent literature on cliques in an athletic setting established that intra-team groups are inevitable, while also highlighting their emergence and formation, and their relative consequences at the team level (Martin, 2020; Wagstaff & Martin, 2018). Despite the scientific advancement at the group level, research concerning cliques is scarce. Therefore, the purpose of this qualitative study was …

Religious Iconography, Expressionist Lighting, And The Antihero's Spiritual Journey In Marvel's Daredevil, Savannah L. Pruett

College of Graduate Studies: Theses & Dissertations

In Marvel’s Daredevil (2015), Matthew Murdock undergoes different phases of an antiheroic spiritual journey as his faith in the judicial system and his Maker is tested by evil in Hell’s Kitchen, New York City. This thesis will dig deeper to reveal how the Daredevil series uses purposefully designed religious iconography and expressionist lighting to tell the story of Matthew Murdock’s antiheroic spiritual journey across three seasons. This thesis aims to prove that Daredevil is a complex and thought-provoking franchise that analyzes what it means to be an antihero, including the moral and ethical lines one is willing to cross to …

Carbon Dioxide Gasification Of Biochar: A Study On Utilizing Captured Co2 To Mitigate Greenhouse Gas Emission And Improving Carbon Conversion Efficiency, Nnamdi Ofuani

College of Graduate Studies: Theses & Dissertations

With rapidly growing global economies and world population, fossil fuel continues to play a major role in meeting current energy demands. Carbon capture and storage (CCS) technologies have, hence, been implemented to reduce CO₂ emissions in the atmosphere. With the implementation of CCS technologies comes the need to utilize the captured CO₂. This research, therefore, proposes CO₂ gasification of biochar as a viable carbon utilization pathway. With captured CO₂ coming at various concentrations, there is a need to understand how CO₂ concentration affects biochar conversion to useful products. This study, therefore, evaluates the effects …

Classification In Supervised Statistical Learning With The New Weighted Newton-Raphson Method, Toma Debnath

College of Graduate Studies: Theses & Dissertations

In this thesis, the Weighted Newton-Raphson Method (WNRM), an innovative optimization technique, is introduced in statistical supervised learning for categorization and applied to a diabetes predictive model, to find maximum likelihood estimates. The iterative optimization method solves nonlinear systems of equations with singular Jacobian matrices and is a modification of the ordinary Newton-Raphson algorithm. The quadratic convergence of the WNRM, and high efficiency for optimizing nonlinear likelihood functions, whenever singularity in the Jacobians occur allow for an easy inclusion to classical categorization and generalized linear models such as the Logistic Regression model in supervised learning. The WNRM is thoroughly investigated …

Exploring The Relationships Among Adhd, Generalized Anxiety Disorder, And Emotion Regulation, Anna S. Hall

College of Graduate Studies: Theses & Dissertations

This study investigated the relationships among Attention-Deficit Hyperactivity Disorder (ADHD) symptoms and common comorbid struggles for clients, including Generalized Anxiety Disorder (GAD) symptoms, and executive functions, especially emotion regulation. ADHD and GAD are prevalent mental health conditions, are commonly comorbid with each other, and are both correlated with relative deficits in executive functions. Executive functions comprise higher-order cognitive processes like planning, inhibition, initiation, and monitoring, as well as emotion regulation. Prior research established connections among ADHD symptoms, GAD symptoms, and emotion regulation but did not examine which specific facets of emotion regulation were most relevant. The current study aimed to …

The Distribution Of The Significance Level, Paul O. Monnu

College of Graduate Studies: Theses & Dissertations

Reporting the p-value is customary when conducting a test of hypothesis or significance. The likelihood of getting a fictitious second sample and presuming the null hypothesis is correct is the p-value. The significance level is a statistic that interests us to investigate. Being a statistic, it has a distribution. For the F-test in a one-way ANOVA and the t-tests for population means, we define the significance level, its observed value, and the observed significance level. It is possible to derive the significance level distribution. The t-test and the F-test are not without controversy. Specifically, we demonstrate that as sample size …

Self-Authorship Among First-Generation Learners: A Qualitative Study, Issac C. Taylor

College of Graduate Studies: Theses & Dissertations

In the realm of higher education, an increasingly important concern is the intellectual capacity of first-generation learners. To improve their cognitive, intrapersonal, and interpersonal development in contemporary society, it is essential for institutions to gain a comprehensive understanding of these students' unique challenges. The existing body of literature on first-generation students has predominantly centered on the personal challenges and institutional barriers that impede their pursuit of higher education. However, promoting self-authorship among this student population presents a unique opportunity for faculty, staff, and administrators to facilitate and reinforce the developmental needs of students who are the first in their families …

Computer Cravings In 20th Century Schools: From Creativity To Capitalism, Keely E. Amos

College of Graduate Studies: Theses & Dissertations

This dissertation examines the push for computers in education from the early 1980s to the early 2000s. During that time, computers were introduced into schools across America with big promises, in turn creating big dreams. Instead of the cognition, creativity, and collaboration that was envisioned with computers in the classroom, the shifting motivations regarding computers have exacerbated the datafication and standardization of our students (Cuban, 2001). The problems associated with the corporation of computers into the curriculum are widespread (Pinar et. al, 1995/2004). Following the methodology of Historiography, this paper provides a critical examination about what was promised, and by …

Gathered Vessels, Marguerite E. Mccoy

College of Graduate Studies: Theses & Dissertations

My journey with ceramics is a path paved with the memories of my mother's kitchen, travels across Europe, and a deep love for creating spaces where people can come together. From the warmth of a mug that fits just right in your hands, to the gentle sounds of water playing in a fountain I've crafted, my work is about making those little moments of connection feel extra special. I create ceramics that are meant to be picked up, used, and loved - pieces that carry a bit of my story to join in with yours. Whether it's joining in your …

Exploring Police K-9 Deaths, Their Causes, And Possible Remedies, John Wise

College of Graduate Studies: Theses & Dissertations

Police K-9s face daily dangers due to their work. Data collected by the Officer Down Memorial Page from 2000-2023 on K-9 deaths (N = 405) shows that of K-9s that die in the line of duty, many fall victim to heat stroke. Research was conducted comparing heat stroke to all other causes of death. Through an exploration into the history of mankind’s use of working dogs, the unique capabilities of both dogs and K-9 specific dog breeds and applying Routine Activity Theory and Lifestyle Routine Activity Theory to police K-9s, this study’s objective is to bring awareness to, and …

Variation In The Fear Response Of Atlantic Sand Fiddler Crabs (Leptuca Pugilator) To Anthropogenic Disturbance, Katrina L. Buttram

College of Graduate Studies: Theses & Dissertations

Leptuca pugilator is a common inhabitant of southeast Georgia salt marshes. This study examined the boldness of Leptuca pugilator across environmental conditions and human impacts. Here, boldness was defined as time taken to reemerge from a burrow after a fear stimulus. I hypothesized that crabs would vary in their boldness based on their surroundings, reproductive timing, and sex. Field and experimental trials were conducted to isolate which factors most influence boldness. Field trials were conducted at four sites varying in human influence throughout the breeding season. During each survey, vegetation height, substrate temperature, average burrow width, burrow count, and distance …

Hybridization And Duplex Stability Of Peptide Nucleic Acid Containing An Azobenzene Switch, Carmen J. Velasquez

College of Graduate Studies: Theses & Dissertations

Light-driven molecular switches that can be turned on and off on demand have found many biological applications. For DNA, RNA, and synthetic derivatives, the switch can be used to interfere with a hybridization event with a complementary strand. To explore this potential, we have synthesized three light-sensitive PNA which have an azobenzene group (PNA-5azo5 and PNA-4azo4), and two azobenzene groups (PNA-2azo5azo2) as part of the PNA backbone. UV experiments were used to verify the conversion to the cis-isomer from the initial trans state for all of the single-stranded Azo-PNA ( PNA-5azo5, PNA-4azo4, and PNA-2azo5azo2) by irradiating at 365 nm …

Bringing Gans To Medieval Times: Manuscript Translation Models, Tonilynn M. Holtz

College of Graduate Studies: Theses & Dissertations

The Generative Adversarial Networks (GAN) recently emerged as a powerful framework for producing new knowledge from existing knowledge. These models aim to learn patterns from input data then use that knowledge to generate output data samples that plausibly appear to belong to the same set as the input data. Medieval manuscripts study has been an important research area in the humanities field for many decades. These rare manuscripts are often times inaccessible to the general public, including students in scholars, and it is of a great interest to provide digital support (including, but not limited to translation and search) for …

Integration Of Infrared Thermography And Deep Learning For Real-Time In-Situ Defect Detection And Rapid Elimination Of Defect Propagation In Material Extrusion, Asef Ishraq Sadaf

College of Graduate Studies: Theses & Dissertations

This study presents a novel approach to overcoming process reliability challenges in Material Extrusion (ME), a prominent additive manufacturing (AM) technique. Despite ME's advantages in cost, versatility, and rapid prototyping, it faces significant barriers to commercial-scale production, primarily due to quality issues such as overextrusion and underextrusion, which compromise final part performance. Traditional manual monitoring methods severely lack the capability to efficiently detect these defects and highlight the necessity for an efficient and real-time monitoring solution. Considering these challenges, an innovative and field-deployable infrared thermography-based in-situ real-time defect detection and feedback control system is proposed in this thesis. A novel …

Training Underrepresented Minority Students For Careers In Public Health Leadership – Public Health Leaders Fellowship Program, Jigsa Tola

College of Graduate Studies: Theses & Dissertations

Background: Shortage and lack of diversity in the United States public health workforce is well documented and remains a challenge to meaningfully improving the health of the population. Although the diversity of the public health workforce has implications for access, care quality, and career opportunities in low-income communities, there is no strong mechanism by which minorities are trained to replenish the workforce. Morehouse College’s Public Health Leaders Fellowship Program (MC-PHLFP) is a cooperative program with the Centers for Disease Control and Prevention (CDC) to train undergraduate students for careers in public health leadership.

Purpose: The purpose of this research is …

The Effect Of First-Person Testimonial Versus Didactic Video Interventions On Attitudes And Behavioral Intentions Toward Buprenorphine, Tristan S. Fletcher

College of Graduate Studies: Theses & Dissertations

Emerging adults exhibit disproportionately elevated levels of substance use disorders (Substance Abuse and Mental Health Services Administration [SAMHSA], 2021), opioid misuse (SAMHSA, 2021), and opioid use (Hu et al., 2017; Jones et al., 2015) compared to other age cohorts. If left untreated, opioid misuse and opioid use disorder can lead to various negative consequences, including premature death (Strang et al., 2020). Prior research indicates emerging adults have higher opioid-related mortality rates compared to other age groups in the United States (Gomes et al., 2018). Buprenorphine, an opioid partial agonist medication, is an effective intervention for opioid use disorder (Mattick et …

Always A Dreamer, Liz Walker

College of Graduate Studies: Theses & Dissertations

ABSTRACT

This is the story of my life in the form of a memoir. You might ask, why is my life a relevant subject for a dissertation? As Celeste Snowber, the scholar, author and performer recently said to me, “I think it would be wonderful to write a memoir.... You clearly have an extraordinary life, with art, soul and the depths of wisdom marinating all you do” (2023, personal communication). I was flattered by her comments and her confidence in me gave me the inspiration I needed to tell my story. There is also the meaning of ‘lived experience’ in …

Railroad Condition Monitoring Using Distributed Acoustic Sensing And Deep Learning Techniques, Md Arifur Rahman

College of Graduate Studies: Theses & Dissertations

Proper condition monitoring has been a major issue among railroad administrations since it might cause catastrophic dilemmas that lead to fatalities or damage to the infrastructure. Although various aspects of train safety have been conducted by scholars, in-motion monitoring detection of defect occurrence, cause, and severity is still a big concern. Hence extensive studies are still required to enhance the accuracy of inspection methods for railroad condition monitoring (CM). Distributed acoustic sensing (DAS) has been recognized as a promising method because of its sensing capabilities over long distances and for massive structures. As DAS produces large datasets, algorithms for precise …

Social And Structural Determinants Of Health As Predictors Of Covid-19 Vaccine Hesitancy Among Older Adults In The United States, Kingsley Kalu

College of Graduate Studies: Theses & Dissertations

Background: Although vaccination is one of the greatest accomplishments in public health, some people, especially older adults, are reluctant to take vaccines. This study examined the association between the social and structural determinants of health and COVID-19 vaccine hesitancy among older adults in the United States.

Methods: Secondary data from the Health and Retirement Study (HRS) was used. The HRS participants were 65 years and older, and the sample size was 2311. Multinomial multivariable logistic regression models were conducted for this study.

Results: The study shows that social determinants of health (marital status, educational level) and structural determinants of health …