Digital Commons Network^™

Gold(I)-Hydroarylation In Polymer Modification – Alkynes And Alkenes With Unexpected Reactivity, Samuel B. Hunt

Dissertations

Polymer modification is crucial for developing new properties and materials from recalcitrant waste polymers. Synthetically, polymers possess a chemical inertness that renders their functionalization challenging. Specifically, the omnipresence of C–H bonds in all commercial polymers endows their chemical resistance. Thus, developments in C–H activation chemistry are crucial to polymer diversification processes and allow for fundamental insight into the role of material processing conditions on novel chemical reactions. Au(I)-chemistry has recently come to the fore owing to a unique chemical reactivity nonexistent with other transition metals. The alkynophilicity of Au(I), in tandem with their insensitivity to common polymer processing conditions (air, …

Comparison Between The Effectiveness Of Mysci And Openscied Curricula On The Achievement And Attitudes Of Eighth Grade Science Students, Nicole Vick, Nina Blanton

Dissertations

Educators have struggled with maintaining student engagement in science, especially as students transition from primary to middle school and upper grades (Vedder-Weiss & Fortus, 2012). A recent push in science education has been the adoption of the Next Generation Science Standards (NGSS), released in 2013, whose development was guided by A K-12 Framework for Science Education (NGSS Lead States, 2013). As a result, more educators have been incorporating curricula that require students to ascertain disciplinary core ideas using lenses of cross cutting concepts while engaged in science and engineering practices; the three dimensions of NGSS performance expectations (PE) also …

Development Of Graphene And Graphene Derivative Advanced Functional Additives: Mechanism And Application In Asphalt Formulations And Thermal Interface Management Materials, Dana Pinson

Dissertations

The overarching focus of my research is the use of graphene and graphene derivatives to enhance polymer properties. My first focus area was the prevention of oxidative degradation of asphalt through the incorporation of a graphene oxide (GO) -based nanoparticle filler to enhance oxygen barrier properties. Primary amine terminated polyisobutylene was synthesized via cationic polymerization followed by post polymerization chain end modification in a range of molecular weights and covalently grafted via the primary amine to graphene oxide aerogel (aGO) to create a polyisobutylene grafted graphene oxide (PIB-g-GO) nanoparticle. PIB-g-GO was then mixed into a substitute asphalt matrix at various …

An Engineering Approach For Evaluating The Lifetime Experience Of Sex Trafficking Victimization, Kimberly Starr Nagulpelli

Dissertations

This research is an original approach that applies industrial engineering and operations research tools to the sociological problem of sex trafficking victimization. Such an approach enables quantitative evaluation of the impacts on an individual’s lifetime by anti-trafficking efforts and public policies.

A fully interconnected, lifetime model for the experience of sex trafficking victimization is defined as the result of a comprehensive review of literature. Beginning with victimization risk, the defined model is an anticipatory tool to understand the incidences and consequences to individuals during their lifetime. This research develops the model further into a Discrete-Time Markov Chain (DTMC) with definitions …

Undergraduate Nursing Students' Perceptions Of Clinical Readiness Increase With Integration Of Simulation Using Ati-Supported Resources, Kasey L. Trill

Dissertations

The purpose of this study was to increase first semester Historically Black College and University (HBCU) nursing student's simulation exposure by 50% using the ATI education platform and measure student perceptions of readiness for clinical rotations. This study addressed the research gap of simulation in beginning nursing courses and the impact on student perceptions of self-efficacy in future clinical rotations and contributes to the larger body of simulation research by answering the following questions:

1. What are student perceptions regarding simulation and clinical readiness?

2. How does exposure to simulation impact student clinical performance outcomes?

3. To what degree does …

Perceptions Of The Veterans Administration And Mental Health Treatment Seeking Intentions Among Veterans, Hilary Hines

Dissertations

Among the veteran population there is a trend of underutilizing mental health services despite the higher number of veterans with mental health diagnoses. Though previous research has examined barriers to mental health care such as stigma and a warrior mentality, there may be additional barriers that emanate from the system to which veterans are entitled and encouraged to use, the Veterans Administration (VA). This study examined the mediational relationships among perceptions of the VA, attitudes about seeking mental health treatment at the VA, and intentions to seek mental health treatment at the VA among veterans. Data from 96 veterans were …

Stereotype Threat: A Proposed Process Model On The Impact Of Stereotype Threat On Self-Efficacy And Minority Performance, Sherese Stewart

Dissertations

Kingdon and Cassen (2010) indicated that historically there has been concern about the educational achievement of minority individuals. There is a need for research about the psychological mechanisms that play a part in the minority achievement gap. This document explored how stereotype threat impacts self-efficacy and minority academic performance and implications for cultural mistrust, imposter phenomenon, and self-fulfilling prophecies. All these factors have the propensity to place minority individuals at risk for low performance, leading to gaps in education. The population of focus for this review consisted of African Americans, Latinx individuals, and women. There has been limited research about …

Narratives Of Perseverance By Latina Women Paving Their Way To Success In Science, Technology, Engineering, Art, And Math (Steam) Higher Education, Toni Carmichael

Dissertations

The purpose of this narrative study was to understand the experiences of successful Latina women attaining higher education in Science, Technology, Engineering, Art, and Mathematics (STEAM) and the challenges they have overcome along the way. Additionally, I sought to examine ways in which these students challenged the stigma of invisibility often attached to Latino communities. Representatives from Brazil, Ecuador, El Salvador, and Mexico, the participants of this study were seven women employed in various areas of STEAM with higher education degrees.

Cultural Capital and Feminist Cultural Studies provided the theoretical framework for this study. The three-dimensional narrative design was applied …

Improving Second Language Learning Through Performance-Based Assessment Practices, Maria Granados

Dissertations

From the time of the No Child Left Behind Act (2001) to the present day, standardized testing has become the benchmark measure for student assessment and school accountability in the United States. Multilingual learners are a vulnerable population with more testing and accountability requirements than mainstream students. Not only are they required to learn a second language, but they are also assessed within the same standardized testing paradigms as their peers - native speakers of the English language. This study aimed to examine and evaluate the benefits of instructional practices and assessments that provide multilingual students and teachers prompt and …

How Teacher Implemented Social-Emotional Learning Curriculum Impacts Collective Teacher Efficacy And Influences Teacher Beliefs About Job Satisfaction, Lisel Patrylow

Dissertations

“Teachers are the engine that drives social and emotional learning (SEL) programs in classrooms and schools, and their own social-emotional competence strongly influences their students” (Schonert-Reichl, 2017, p. 137). I wanted to examine if teachers benefited from teaching SEL. The purpose of my study was to examine if teachers perceived benefits to their Collective Teacher Efficacy (CTE) and job satisfaction beliefs when they taught SEL. The context of my research was elementary schools in one school district. I conducted surveys with elementary school classroom teachers and counselors. The findings from my study indicated that classroom teachers perceived that their SEL …

Improving Autonomous Vehicles Operational Performance Using Resilience Engineering, Johan Fanas Rojas

Dissertations

Autonomous vehicles are expected to revolutionize the transportation industry by providing a safer and more efficient means of transportation. However, as autonomous vehicles are deployed on public roads, they are exposed to significant risks, both in terms of safety and system performance. Recent studies have highlighted a range of errors and accidents associated with autonomous vehicles, underscoring the need for a systematic approach to improve their operational resilience. Resilience engineering, a discipline focused on designing and analyzing complex systems to better cope with unexpected events and disruptions, offers a promising framework for addressing these challenges. Despite the potential benefits of …

Enabling Energy Efficiency In Connected And Automated Vehicles Through Predictive Control Techniques, Farhang Motallebiaraghi

Dissertations

The transportation sector is a significant contributor to global energy consumption and emissions, necessitating the development of sustainable transportation systems. In this regard, connected and automated vehicles (CAVs) have emerged as a potential solution to transform the transportation industry. By harnessing advanced mapping and location technologies, Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communication, CAVs offer the promise of improving efficiency, reducing traffic congestion, and enhancing safety and comfort. However, the adoption of CAVs also brings about various challenges, including energy efficiency concerns that need to be addressed to fully realize their potential benefits. This dissertation investigates energy-efficient control techniques for transportation …

Telehealth Functional Behavior Assessment In Practice: A Demonstration Of The Clinical Utility Of Dynamic Probability Analyses And Estimates Of Contingency Strength, Lilith Michaele Reuter-Yuill

Dissertations

The spread of SARS-CoV-2 and acceleration of coronavirus disease cases resulted in a global pandemic and presented unique and unprecedented humanitarian issues. Behavior analysts trained in the area of functional behavior assessment offer important services that may assist families to address behavioral challenges that they face during this difficult time. Despite the growing body of evidence of telehealth functional behavior assessments, practitioners still face several unknowns. In Experiment I, a telehealth functional behavior assessment was conducted with three children with autism spectrum disorder. Assessment methods represented a continuum of experimental control from unstructured conditions (no experimental control), structured descriptive assessment …

Wideband Parameter Estimation Of Overhead Transmission Lines From Terminal Measurements, Fahad J. Alqahtani

Dissertations

The accurate and efficient determination of electrical parameters of transmission lines is essential when performing computer-aided analyses of power systems, including power-flow, state estimation, short-circuit, transient stability, power quality, and electromagnetic transients.

In this dissertation, a novel technique for wideband parameter estimation of frequency-dependent single-phase, three-phase transposed, and three-phase untransposed overhead lines, is proposed. The proposed technique utilizes terminal measurements of transient voltages and currents and is based on an analytical approach to solve the frequency domain 2-port nodal model of the line for the series impedance and shunt conductance per unit length as a function of the frequency. The …

A Pesar De Todo: A Phenomenological Study On Latinx Undergraduate Students Choosing Their Academic Majors, Flor Carabez

Dissertations

The Latinx population is the largest non-White group in the United States (U.S.) (U.S. Census Bureau, n.d.; Excelencia in Education, n.d.). Nonetheless, members of this community still experience adversity in a myriad of areas, including college degree attainment (Blankenberger et al., 2017; Dueñas & Gloria, 2020; Flores, 2021; Garcia, 2020; Gloria & Castellanos, 2012; Gonzales et al., 2015; Lamont Strayhorn, 2008; Mejia‐Smith & Gushue, 2017; Mora, 2022; Moreno, 2021; Seider et al., 2019; Suwinyattichaiporn & Johnson, 2020; Vásquez, 2013). Stifling college degree attainment is problematic as Americans consider it a tool for upward economic mobility (Cohen & Kisker, 2009; Dwyer …

Internationalization Strategies In Chinese Higher Education Institutions: Examining A Selection Of Award-Winning Four-Year Universities, Yuqian Zhang

Dissertations

China is building the fastest growing higher education system, in quality as well as in quantity, in the world and emphasizes internationalization in education policy as a guide to building its own capacity and developing native talent. With regained self-confidence and geopolitical ambition, China is also emerging as a new potential higher education leader along its New Silk Road. The purpose of this study was to explore internationalization strategies employed at select, award-winning Chinese four-year universities, specifically those awarded the National Teaching Achievement Award, the highest national award in teaching and education in the country, for their internationalization efforts.

This …

The Skin I’M In: A Critical Content Analysis Of Picture Books Written By Black Authors, Angela Latrece Justice

Dissertations

This study seeks to explore the experiences of Black male protagonists in picture books. The following question guided this study: How do Black authors demonstrate a commitment to social justice? The theoretical framework that guides this study is Critical Race Theory (CRT), which aids in understanding how Black authors use experiential knowledge to represent experiences that challenge dominant ideologies about Black males. The sample consists of 20 pictures books all written by Black authors and published within the United States from 2018 to 2021. The deductive and inductive approaches to critical content analysis is used as it is effective for …

The Mobility Of Long-Lived Radioisotopes And Their Burial In The Marine Environment, Neil Redmond

Dissertations

Marine sediments record chemical signals that reflect past environmental conditions. It is important to establish how these signals are created and whether they may be altered over time so that they can be useful for reconstructing ocean history. Measurements of uranium isotopes are used as a novel proxy for sedimentary diagenetic processes (Chapter 2). Because ²³⁴U can be ejected from mineral lattice during the decay of ²³⁸U, it creates a pool of U in porewater that is potentially mobilized and then deposited elsewhere in the core. We found that alpha-recoiled ²³⁴U is sensitive to differences in sediment …

A Rudimentary Framework Of The Emergence Of Naturally-Occurring Mentorships, Aaron S. Baker Cervantes

Dissertations

Cross-age relationships between youth and adults that develop organically outside the construct of youth programs are examples of natural mentoring relationships. In the United States, research has demonstrated the positive impact of these mentorships. Scholars have begun applying concepts learned from natural mentoring to formal mentoring schema; however, much work is yet to be done in examining how these relationships emerge and the factors that impact their development. Designed in partnership with a private secondary school in rural México, this study aimed to unpack these questions using a grounded theory approach. Current students, alumni, and teachers participated in the study …

Stream-Evolving Bot Detection Framework Using Graph-Based And Feature-Based Approaches For Identifying Social Bots On Twitter, Eiman Alothali

Dissertations

This dissertation focuses on the problem of evolving social bots in online social networks, particularly Twitter. Such accounts spread misinformation and inflate social network content to mislead the masses. The main objective of this dissertation is to propose a stream-based evolving bot detection framework (SEBD), which was constructed using both graph- and feature-based models. It was built using Python, a real-time streaming engine (Apache Kafka version 3.2), and our pretrained model (bot multi-view graph attention network (Bot-MGAT)). The feature-based model was used to identify predictive features for bot detection and evaluate the SEBD predictions. The graph-based model was used to …

The Impact Of The Wiki-Enhanced Tblt Approach On High School Students’ Writing Skill In A Boys’ Public School In Al Ain, Uae, Abdullah Mahmoud Taha

Dissertations

This study investigated the impact of the wiki-enhanced task-based language teaching (TBLT) approach on students’ writing skill in the context of English as a foreign language (EFL) in the United Arab Emirates (UAE). In addition, it explored the students’ and teacher’s views and perceptions toward the implementation of the wiki-enhanced TBLT approach. The study data were collected quantitatively and qualitatively from two classrooms in a public high school in the UAE, which consisted of 30 students. The quantitative data were collected via a pretest–posttest design from the two assigned groups of students: the control and experimental groups. The qualitative data …

Blockchain-Enabled Ehr Sharing In Healthcare Federation: Sharding And Interblockchain Communication, Faiza Hashim

Dissertations

Electronic Health Records (EHRs) are crucial components of the healthcare system, facilitating accurate and efficient diagnosis. Blockchain technology has emerged as a promising solution to improve EHRs sharing among medical practitioners while ensuring privacy and security. By leveraging its decentralized, distributed, immutable, and secure architecture, blockchain has the potential to revolutionize the healthcare system. However, due to security concerns, blockchain networks in healthcare typically operate in private or consortium modes, resulting in isolated networks within a federation. Scalability remains a significant challenge for blockchain networks, as the number of participating nodes increases within each network of the federation. Consensus mechanisms …

Synthesis, Characterization, And Photocatalytic Activity Of Photoactive Mofs And M-Hof Under Simulated Visible Light Irradiation, Lamia Ali Siddig

Dissertations

The increasing global energy demand has resulted in environmental issues, leading to a shift in research towards sustainable and renewable energy sources. Among these, solar energy is the most abundant natural resource available. One of the most profitable ways to utilize sunlight is through chemical transformation using photocatalysts. In this regard, we reported the synthesis of different stable porous materials, such as metal-organic frameworks (MOFs) and metal hydrogen-bonded organic frameworks (M-HOFs). The MOF photocatalysts are bismuth-gallate (Bi-gallate), a mixed ligand manganese-based MOF (Mn^II₃(tp)_6/2(bpy)₂. (dmf)) and a new hexagonal layer manganese MOF compound named …

Unraveling The Origins Of Grb190114c: An Investigation Of Progenitor Models Through Observational Analysis, Nusrin Habeeb

Dissertations

Gamma-ray bursts (GRBs) are among the most energetic and violent events in the universe, characterized by sudden and intense emission of gamma rays lasting from a fraction of a second to several minutes. The primary focus of this thesis is to study gamma-ray bursts (GRBs), with a specific emphasis on GRB190114C. GRB190114C is a long-duration GRB that was detected on January 14, 2019, by the Fermi Gamma-ray Burst Monitor (GBM) and the Swift Burst Alert Telescope (BAT). It had a T₉₀ duration of 116 s and a redshift of z = 0.4245, which corresponds to a luminosity distance of …

Bismuth And Lanthanides In Mixed Metal Oxides To Metal– Organic Frameworks: Synthesis, Cherectarization, And Photocatalytic Performance, Reem H. Alzard

Dissertations

Known as rare–earth elements (REE), lanthanides (Ln) found in f–blocks of the periodic table, have gained much interest because of their unique characteristics including magnetism, photoluminescence and catalysis. Having a diverse range of coordination geometries, lanthanides can result in different complexes and materials. Herein, three classes of materials containing selected lanthanides such as lanthanide bismuth mixed metal oxides (Ln–Bi oxides), 1D lanthanide coordination polymers (Ln–CPs) and lanthanide metal–organic frameworks (Ln–MOFs) were investigated. Simple route sol– gel method was used to prepare Ln–Bi oxides while Ln–CPs and MOFs were prepared by solvothermal condition. The materials were characterized using multiple analytical, spectroscopic …

Machine Learning And Network Embedding Methods For Gene Co-Expression Networks, Niloofar Aghaieabiane

Dissertations

High-throughput technologies such as DNA microarrays and RNA-seq are used to measure the expression levels of large numbers of genes simultaneously. To support the extraction of biological knowledge, individual gene expression levels are transformed into Gene Co-expression Networks (GCNs). GCNs are analyzed to discover gene modules. GCN construction and analysis is a well-studied topic, for nearly two decades. While new types of sequencing and the corresponding data are now available, the software package WGCNA and its most recent variants are still widely used, contributing to biological discovery.

The discovery of biologically significant modules of genes from raw expression data is …

Neural Correlates Of Post-Traumatic Brain Injury (Tbi) Attention Deficits In Children, Meng Cao

Dissertations

Traumatic brain injury (TBI) in children is a major public health concern worldwide. Attention deficits are among the most common neurocognitive and behavioral consequences in children post-TBI which have significant negative impacts on their educational and social outcomes and compromise the quality of their lives. However, there is a paucity of evidence to guide the optimal treatment strategies of attention deficit related symptoms in children post-TBI due to the lack of understanding regarding its neurobiological substrate. Thus, it is critical to understand the neural mechanisms associated with TBI-induced attention deficits in children so that more refined and tailored strategies can …

Motion-Resistant Pulse Oximetry, Ludvik Alkhoury

Dissertations

The measurement of vital signs ? such as peripheral capillary oxygen saturation (SpO₂) and heart rate (HR) levels ? by a pulse oximeter is studied. The pulse oximeter is a non-invasive device that measures photoplethysmography (PPG) signals and extracts vital signs from them. However, the quality of the PPG signal measured by oximetry sensors is known to deteriorate in the presence of substantial human and sensor movements contributing to the measurement noise. Methods to suppress such noise from PPG signals measured by an oximeter and to calculate the associated vital signs with high accuracy even when the wearer …

Biomechanical And Psychophysical Underpinnings Of Balance Dysfunction In Individuals With Traumatic Brain Injury, Naphtaly Ehrenberg

Dissertations

Falls are a major burden on healthcare infrastructure, especially in older adults and even more so in older individuals that are living in institutions. According to data from the Centers for Disease Control and Prevention (CDC), from 2010 to 2020, unintentional falls were the leading cause of nonfatal emergency department visits for all age groups except among individuals from 15-24 years of age, where unintentional falls ranked a very close second to being unintentionally struck by or against. Among older individuals living in the community, approximately 30-35% fall at least once in a given year, and around three times as …

Sparse Methods For Blind Source Separation Of Frequency Hopping Rf Sources, Anushreya Ghosh

Dissertations

Blind source separation (BSS) is performed on frequency hopping (FH) sources. These radio frequency (RF) signals are observed by a uniform linear array (ULA) over a Spatial Channel Model (SCM) in four different propagation environments: (i) line-of-sight (LOS), (ii) single-cluster, (iii) multiple-cluster, and (iv) LOS with interference. The sources are spatially sparse, and their activity is intermittent and assumed to follow a hidden Markov model (HMM). BSS is achieved by utilizing direction of arrival (DOA) of the sources and clusters. A sparse detection framework is applied to obtain estimates of the sources' FH and DOA patterns. The solutions are binned …