Digital Commons Network^™

Naturally Derived Fibrous Scaffolds Containing Metabolic Factors For Bone Tissue Engineering, Apurva Limaye

Dissertations

More than 500,000 bone grafting procedures are performed each year to treat bone defects, trauma, and non-unions. Current strategies, including autografts and allografts, face limitations that include donor site morbidity and poor integration, respectively. Treatments using the delivery of the growth factor, bone morphogenetic protein-2 (BMP2), result in ectopic bone formation and adverse effects at high doses. Tissue engineering strategies are utilized to combat these challenges. Natural biomaterials are commonly used as tissue engineering scaffolds due to their biocompatibility, biodegradability, and they can promote cellular function. However, animal-derived materials can have limitations in availability, lot to lot variability and potential …

Microplastics And Genetic Vectors Promoting The Dissemination Of Antimicrobial Resistance In Municipal Wastewater Treatment Processes, Ngoc Dung Pham

Dissertations

The spread of antimicrobial resistance in the environment and especially its transfer into human pathogens have emerged as global issues. Activated sludge units at municipal wastewater treatment plants are "hotspots" converging a multitude of contaminants, including antibiotics, antibiotic-resistant bacteria (ARB), human pathogens, and microplastics. The prevalence of antibiotics can induce stress response of sludge microbial communities and promote the development of new resistance mechanisms and transmission venues, through which the dissemination of antibiotic resistance genes (ARGs) arises as mediated by mobile genetic elements (MGEs). In this doctoral dissertation, the impacts of microplastics and genetic vectors (i.e., MGEs and bacterial hosts) …

Platinum Nanoparticles, Targeted Therapy For Triple Negative Breast Cancer, Aida Lopez Ruiz

Dissertations

Nanotechnology is a multidisciplinary field that has many different applications including cancer treatment and detection. Noble metal nanoparticles such as gold, silver or palladium, have shown major potential in the field of medicine and pharmaceutics. In particular, platinum nanoparticles (Pt NPs) have been reported with promising anticancer results. The activity of nanoparticles is based on their small size and high surface area; these properties allow them to penetrate biofilms as well as influence intracellular mechanisms. Recent studies indicate that Pt NPs can be used as a therapy for cancer showing a limited toxicity to healthy cells. Hence, in this work, …

Implementation Of The Family Help Protocol: A Feasibility Project For A West Texas Icu, Rebecca Mcclay

Dissertations

The purpose of this project was to determine if there is sufficient bedside ICU nurse buy-in to the Family HELP protocol to make implementation feasible at one county hospital in West Texas.

Water Management And Corrosion Performance From Protective Polymer Coatings With Spatially Controlled Hydrophilic Domains, Jessica M. Davison

Dissertations

Metallic corrosion has become an annual multibillion-dollar problem for the industrialized world and global contamination issue through the process of repair, removing, and reapplying protective coatings. Typical corrosion resistant coatings are comprised of polymeric coating layers with anti-corrosive pigments, plasticizers, sacrificial additives, and/or other formulation materials, which are formulated to prevent, detect, and manage corrosion. Our counterintuitive approach was to improve upon the understanding of how, when, where, and why environmental contaminants (reactants, mainly water and electrolytes) driving corrosion, propagate and accumulate as localized hydrophilicity shifts within a model polymer coated substrate. Herein, hydrogel particles (HGP) were synthesized of defines …

Barriers To Implementing A Work-Based Learning Program: A Health Science Educator Perspective, Daniel Harrison

Dissertations

Career and Technical Education programs’ mission statement is to supply a skilled workforce for all industries (ACTE, 2021). The Health Science pathway lags behind other industry sectors in active work-based learning programs (Greenfield & Stevens, 2018). Therefore, this study examines the potential barriers to implementing work-based learning programs within the Health Science pathway. The qualitative descriptive investigation into the three types of work-based learning of visits to the workplace, work-like experiences, and employment discovered critical findings regarding healthcare requirements, scheduling conflicts, and access to facilities. Finding 1 details healthcare requirements as the most significant barrier to work-based learning programs. The …

The Impact Of A Five-Day Number Sense Intervention On High School Student's Quantitative Reasoning Skills And Self-Efficacy, Rebecca Steele-Mackey

Dissertations

Understanding numerical quantities and applying this knowledge in practical applications is essential throughout life. A well-developed number sense comes from learning foundational skills and continuing to rely on these skills and concepts in higher mathematical education as well as in adulthood. Prior research shows that K-8 students lack a conceptual understanding of fraction, decimal, and percentage concepts (NCTM, 2009). While there is literature that identifies a deficit in these mathematical areas, there is a need to examine possible activities and interventions that can be performed throughout secondary education courses that support growth in students' conceptual understanding of rational number concepts. …

An Asset Model: Identifying Institutional Characteristics And Behaviors That Close Community College Completion Gaps Between Black And White Students, Courtney Lange

Dissertations

The United States fails to meet its own workforce needs, and estimates show that by the year 2025, almost two out of three jobs in the nation will require at least some postsecondary education or training (Carnevale et al., 2019b). Jobs with the fastest growth rate will require an associate degree (Carnevale et al., 2019b). According to the most recent national data from the National Student Clearinghouse (NSC) Research Center, one in three students begin their college journey at a community college (NCES, 2019). Only 40% finish a degree or credential within six years (NCES, 2019). The proportion of those …

Psychological Capital And Perceived Employability: Exploring Women Veterans’ Military-To-Civilian Career Transition, Tundra Gatewood

Dissertations

The veteran human capital remains integral to the U.S. workforce and sustainment of its competitive advantage (Carter, Schafer, et al., 2017). Women constitute 17% of 1.4 million servicemembers and 10% of 18.4 million veterans, with a projected population growth of 18% by 2040 (Defense Manpower Data Center [DMDC], 2021; U.S. Bureau of Labor Statistics, 2020a). Each year, an estimated 30,000 ex-servicewomen enter the national labor force (National Center for Veterans Analysis and Statistics, 2019; U.S. Bureau of Labor Statistics, 2020a). Most of these ex-servicemembers turned veterans must navigate the military-civilian divide and negotiate their economic worth in highly divergent and …

Self-Efficacy And Burnout Among Mississippi Mild/Moderate Special Education Teachers, Stacey Anne Price Frye

Dissertations

This study sought to determine if there was a relationship between Mississippi mild/moderate (certification endorsement number 221) special education teachers’ levels of self-efficacy and burnout, as well as to determine which factors influenced self-efficacy and burnout. Teachers from across the state of Mississippi responded to an online questionnaire that collected demographic data, the Teachers’ Sense of Self-Efficacy Scale, and the Teacher Burnout Scale.

The results of the correlation research showed that subscales of Student Engagement and Instructional Strategies are positively correlated. Subscales of Student Engagement and Classroom Management are positively correlated. The Teacher Burnout survey subscale of Coping had a …

Policy Implications Of Managing Biodiversity And Natural Resources Across International Boundaries, Dillon Brown

Dissertations

Fisheries Management under the best of scenarios is a complex action. It requires thoughtful consideration of resources that tend to be out of sight, widely distributed, highly variable both spatially and temporally, and present dramatic variation in life history and ecology. No one management approach has been developed which can effectively incorporate all these variables. Add to this the issue of transnational boundary movements of these resources, and one discovers that this complex issue needs to be addressed by multiple entities, agencies, and nations to have any chance of success.

This research set out to discover ways in which fisheries …

The Expanding Marine Built Environment And Biofilm Formation Processes, Rachel Mugge

Dissertations

The marine built environment (i.e., places or things made or modified by humans) in the northern Gulf of Mexico is rapidly expanding and includes over 2,000 known historic shipwrecks, nearly 4,100 artificial reefs, and other built structures for natural resource extraction, marine aquaculture, renewable energy generation, munitions dumping areas, and commercial and recreational activities. While these structures have the potential to develop into artificial reefs, acting as biodiversity hotspots that provide food and shelter and facilitate organism transport, it is unclear how they affect biodiversity and ecosystem function in the marine environment. The success of artificial reefs to become ecosystems …

Towards High-Rate Thermoplastic Composites, Chris Croshaw

Dissertations

This dissertation attempts to identify and address the problems associated with high-rate thermoplastic composites. Herein, three primary research thrusts were investigated; the first two chapters focus on the melt-state degradation mechanism of PEKK copolymers and its role on downstream crystallization and thermomechanical properties, the third chapter examines the role of graphene nanoplatelets (GNP) on the crystallization and melting behavior of PEKK 70/30, and the final chapter focused on radio frequency and induction heating of PEKK nanocomposites.

The melt-state degradation mechanism was identified using a combination of x-ray photoelectron spectroscopy (XPS), molecular dynamics (MD), and quantum mechanics (QM) simulations. Melt-state degradation …

A Look At The Effectiveness Of High School Chemistry Curriculum In Preparing Students For Act, Shanna Nesser

Dissertations

In the ever-changing world, students are challenged with cultivating the skills and knowledge needed to handle the pace and level of understanding required to excel in their future. The foundation for a student's future begins in their formative years, but high school is a prime environment for nurturing the applied, critical thinking, and problem-solving skills needed to move forward into independent, adult life. Mississippi schools are ranked by an accountability score, which is used to determine fund allocation and the development of improvement plans. This score is compiled by looking at various state-tested courses, College and Career Readiness Standards (MS …

Where Are We On This Path? Faculty Experiences Working With Guided Pathways, Christopher Tombari

Dissertations

In this research study, 14 faculty from 13 community colleges were interviewed about their experiences working within the guided pathways framework. They described how processes and procedures at their colleges were modified in significant ways after adopting guided pathways. Viewed through the lens of institutional logics, data suggested that multiple logics interacted and framed the individuals’ perceptions of guided pathways and their opinions regarding the resulting changes to practice. Where logics coexisted and demonstrated complementary values, guided pathways was viewed favorably. Guided pathways elicited negative reactions where logics coexisted in conflict. This research has implications for college leadership considering implementing …

Investigating Novice Nurses’ Perceptions Of Academic Dishonesty During Nursing Education, Christy Michelle Gough

Dissertations

Academic dishonesty in nursing education has been an ongoing concern to the nursing profession for many decades. There is a concern that students who engage in academic dishonesty in the classroom setting might also engage in dishonest behaviors in the professional setting. Many studies in the literature explored nursing students’ perceptions of academic dishonesty during nursing education; however, there was limited literature on novice nurses’ perceptions of academic dishonesty and its impact on the nursing profession. Novice nurses provided the voice of recent nursing students as well as the voice of a professional nurse. The purpose of this qualitative study …

Instance Segmentation-Based Depth Completion Using Sensor Fusion And Adaptive Clustering For Autonomous Vehicle Perception, Mohammad Z. El-Yabroudi

Dissertations

Depth sensing is critical for safe and accurate maneuvering in robotics and self-driving car (SDC) applications. Most recent LiDAR sensors, such as Ouster and Velodyne, offer 360 degrees of scanning at the rate of ten frames per second, making them very appropriate for autonomous driving applications. However, LiDAR point cloud data show many shortcomings, especially its data sparsity and unassigned nature, making it very challenging to utilize in applications such as perception, 3D object detection, 3D scene reconstruction, and simultaneous localization and mapping.

In this study, a novel framework using instance image segmentation and the raw LiDAR data for the …

A Framework For Assessing The 4th Rank Dispersivity Tensor Under Anisotropic Axial Symmetries, Xiang Fan

Dissertations

Multi-dimensional expansion of the advection-dispersion equation necessitated the representation of dispersivity as a 4th rank tensor. This tensorial form of dispersivity has 81 terms in three-dimensions with a maximum of 36 independent terms that may be used to describe Fickian spreading of a dissolved contaminant plume according to intrinsic properties of a porous medium. The complexity of the 4th rank tensor has led to the common practice of simplifying the tensor to only 2 or 3 independent terms by assuming isotropic conditions, although isotropic porous media are uncommon in nature as many natural geologic systems exhibit pronounced anisotropy. A broad …

A Qualitative Approach To Understanding The Career Perceptions And Choices Of Stem Undergraduate And Graduate Students, Jennifer M. Ribble

Dissertations

In order to remain competitive in the global economy, there has been a call to increase recruitment and retention in science, technology, engineering, and mathematics (STEM) careers in the United States (National Science Board, 2014, 2016; President's Council of Advisors on Science and Technology, 2012). In addition to increasing the number of individuals in these fields, it is also imperative to increase the diversity of the individuals filling STEM positions. Not only is it a moral responsibility to create STEM environments that are more inclusive of those who have been historically marginalized in STEM settings, but it is critical in …

Factors That Influence High School Students' Postsecondary Career Decisions In A Guaranteed-Tuition Based School District, Tracy Y. Miller

Dissertations

This study explored factors that influence the postsecondary career decisions of 427 11th and 12th grade students in a guaranteed tuition-based school district in a Midwestern state. Since 2005, this district has had a “Promise” program where eligible students can get up to 100% of their postsecondary tuition paid to attend a college, university, technical, or skilled trade program, or participate in an apprenticeship. Students have up to 10 years after graduating high school to utilize the funding. In addition, students who decide to enter the military after high school have up to 10 years to utilize the funding after …

Algebraic Reasoning And Conceptual Understanding: A Mixed Methods Comparison Of In-Person And Virtual Classroom Strategies, Erneice J. Jackson

Dissertations

Algebraic reasoning is the beginning school of thought to critical thinking. Employers are looking for this 21st century skill. The purpose of this research was to investigate equity in mathematics education using the NCTM Teaching and Learnings Beliefs Survey. Four area were studied: the number of years in education, the degree earned, the grade level taught in education, and the number of years in an educator’s teaching position. A mixed methods inventory was used. Most results were not rejected in this study. Two statements in the survey warranted a discussion. Recommendations were made for further research.

“I Don’T Believe The World Is Tilted”: Emotion, Struggle, And Relationship In Making Meaning With Texts, Alison Faye Oddie

Dissertations

The purpose of this study was to understand how the social and cultural practices of classroom literacy instruction afforded students opportunities to make meaning with texts. Research was conducted from a sociocultural perspective that focused on students as participants in social learning, in a context of interactive relations. This study was responsive to contemporary developments of the sociocultural tradition, recognizing the importance of emotion and other subjective means for constructing understanding. Two classes of a turnaround school, 18 Second-Grade students and 20 Third-Grade students, were observed as they participated in Interactive Read Aloud and Guided Reading over a period of …

The Impact Of Rater Effects On Decision Consistency And Decision Accuracy Under The Many-Facet Rasch Measurement Framework, Haussohou Daniel Edi

Dissertations

The rise of performance-based assessments in high-stakes licensure examinations has brought many challenges in the field of measurement. Although examiners are commonly trained to apply a standardized rating of examinees, the introduction of human subjectivity to the measurement process poses a threat to the reliability and validity of scores from these assessments (Wind & Guo, 2021). Considering the high-stakes decisions based on performance-based assessments when they are used for licensure, it is essential to provide evidence of the consequences that rater effects have on decision consistency and decision accuracy, within and across rating designs. The purpose of this dissertation study …

Development Of Geoscience Interest And Identity Of Female First-Generation Undergraduate Geoscience Students, Dina London

Dissertations

The purpose of this basic qualitative study was to understand how female first-generation undergraduate geoscience students developed their situational geoscience interests into individual interests that, in turn, supported their geoscience identity and decision to become a geoscience major. The experiences of six female first-generation undergraduate geoscience students were used to explore how geoscience interests and geoscience identities developed over time. I analyzed three artifacts representing participants’ geoscience identity, geoscience interest development timeline, and transcribed interviews to explore emerging themes relating to interest and identity development. Participants described events relating to their situational geoscience interests, individual geoscience interests, and the formation …

What We Say Matters: Exploring The Importance Of Microaggression Language For Lgbtq+ Science Major Undergraduate Students, Madison L. Fitzgerald-Russell

Dissertations

The purpose of this exploratory qualitative study is to better understand the climate for LGBTQ+ science major undergraduates in their departments through a transformative queer theory lens and intersectionality. Prior research on campus and STEM department climates have demonstrated inclusion issues continue to persist for LGBTQ+ individuals in higher education. One of these issues is discrimination in the form of microaggressions. Microaggressions against LGBTQ+ individuals have been demonstrated to cause physical, mental, and academic harm. In the literature, there is limited information on how microaggressions impact students in particular STEM fields.

LGBTQ+ science undergraduates from public colleges and universities in …

It’S More Than Nursing: The Experiences Of Psychological Safety Of Pre-Licensure Nursing Students Who Identify As Black, Indigenous, And People Of Color, Melissa Marie Anozie

Dissertations

The healthcare environment mandates its staff are able to communicate freely and openly to provide high quality patient care leading to positive patient outcomes. As the largest healthcare profession and those who are at the bedside most often with patients, registered nurses play a vital role in ensuring these outcomes. As advocates for the most vulnerable, nurses must communicate often but before doing so, they must feel psychologically safe. Psychological safety is how one perceives the benefits, risks, and consequences of asking a question, sharing an opinion, reporting an error, or revealing one’s true self to others. It is a …

Study Of Sustainable Development In Paper, Printing And Packaging Material Applications To Support Circular Economy, Prashant Ramesh Kotkar

Dissertations

To support circular economy and sustainability, the use of suitable material in paper, printing, and packaging industries, for several types of industrial printing material and printed product applications, plays a significant role for end user applications. Several types of packaging printing materials, specifically those finished with different printing technologies and exposed to different environmental conditions are targeted.

The purpose of this research study is to improve design and evaluation for paper, printing, and packaging material sustainability in end-user applications, to deal with the addressed sustainability issues brought by the paper, printing and packaging products end user groups. As the impacts …

Developing Distributed Real-Time Hybrid Simulation For Dynamic Response Evaluation Of Floating Wind Turbine, Hezha Lutfalla Sadraddin

Dissertations

Floating wind turbine (FWT) has a significant role in producing clean and sustainable energy in unlimited spaces with more steady wind and less cost. The design, construction, and safe operation of FWTs require a deep understanding of their dynamic responses under combined aerodynamic and hydrodynamic loads. Conventional FWT model experiments utilize wave tanks and wind tunnels. However, laboratory size and capacity and the scaling conflicts between the Froude and the Reynold numbers in these coupled wind-wave loading tests impose challenges to replicate dynamic responses of FWT. Alternatively, real-time hybrid simulation (RTHS), which combines numerical simulation and physical experiment of FWT …

The Impact Of Intervention Programs For Teenagers At Risk Among Middle And High School Students In Southeast Missouri, Bryan Austin

Dissertations

At-risk students have been noted to be exposed to high cases of early school dropout, late graduation, poor academic performance, and engagement in risky behaviors, such as drug and substance abuse. While research has reported poor transition to future careers and adult life among at-risk students, little is known regarding intervention programs used in Missouri schools to motivate at-risk students. The objective of this study was to investigate intervention programs being used to retain and engage at-risk middle and high school teenagers in Missouri and identify effective intervention programs that might help promote their success in school and subsequent transition …

Addressing The Teacher Shortage: A Study Of Local School Human Resource Efforts In Illinois, Sean C. Potts

Dissertations

Shortages of highly qualified teachers may be one of the greatest challenges school districts face today. This study is an exploration of how eight school districts in Illinois, ranging from rural to suburban and encompassing elementary, high school, and unit organizations, experienced the effects of a teacher shortage in 2021. The three primary research questions of this study included: (1) To what degree were local districts feeling the impact of the teacher shortage in Illinois, and how did those shortages manifest themselves?; (2) What factors did local human resource directors believe to be contributing most to any obstacles they may …