Digital Commons Network^™

Hierarchical Heterogeneous Catalysts For Hydrogenation Reactions, Azina Rahmani

Graduate Thesis and Dissertation 2023-2024

Noble metal catalysts are widely used for their remarkable activity and stability. However, their sustainability is challenged by their scarcity, both in terms of Earth-abundance and production sources. To ensure their sustainable use and long-term availability, it is essential to design new catalytic systems that minimize noble metal usage, maximize reactivity, and allow easy recovery and reuse. One promising approach involves using supported noble metal nanocatalysts (NCs) that enables low loadings of active materials, prevents NCs agglomeration during catalysis, and enhances separability of the catalysts from products. Nickel foams, as NCs support, stand out for their contiguous macroporous 3-D structure …

Doubly Rotating Coordinates: Wave Functions In Magnetic Resonance Problems, Sunghyun Kim

Graduate Thesis and Dissertation 2023-2024

The nuclear spin response to a rotating field H has been theoretically investigated from the 1930s to the 1950s. Building upon Majorana's probability theory, the behavior of spin 1/2 is well-illustrated in the joint review by Rabi, Ramsey, andSchwinger, and their spin wave function ψ is succinctly restated by Gottfried: ψ(t) = e^-iI_zωt/ℏe^{-i[I_z(ω₀-ω)+I_xω₁]t/ℏ}ψ(0).

However, the complexity involved in evaluating the wave function ψ in terms of probability amplitudes C_m attributed to the noncommutative nature of spin operators [I_x, I …

An Exploration Of Administrative Implementation Of Academically Challenging Curriculum To Enhance Learning (Accel- Fl Statute 1002.3105) In Florida Elementary Schools, Patricia L. Cummings

Graduate Thesis and Dissertation 2023-2024

This study investigated the content of 14 Florida district's Student Progression Plans and supportive district documentation to gain a better understanding of each district's implementation of Florida statute 1002.3105, ACCEL; explored the knowledge, attitudes, and experiences of principals of K-5 schools in two large counties in Florida in enacting ACCEL; and utilized the study's findings to create a guide for administrators. The first phase of the study analyzed the 14 largest Florida public school districts utilizing a content analysis and checklists on best practice in acceleration policy from Lupkowski-Shoplik et al. (2018) to examine each district's implementation. The second phase …

A Stress Perspective Of Leader-Follower Relationship Ambivalence, Ghada Baz

Graduate Thesis and Dissertation 2023-2024

Ambivalence is the experience of both positive and negative evaluations regarding an object such as a person or an event. Although interest in leadership ambivalence has been growing among researchers, there is still little understanding of what distinguishes it from poor leadership. The goal of this dissertation was to contribute to the leadership ambivalence literature by examining ambivalence in the leader-member exchange (LMX) relationship through the lens of occupational stress. Specifically, I used the job demands-resources model as a theoretical foundation and presented leadership ambivalence as a unique job demand that is associated with emotional exhaustion as a symptom of …

Sensing Using Angular Momentum Of Light: From Polarization To Optical Vortices, Mahdi Eshaghi

Graduate Thesis and Dissertation 2023-2024

Light is a powerful tool for probing a variety of physical phenomena. This dissertation explores some of the complex properties of light, with a particular emphasis on its angular momentum, encompassing the concepts of polarization and optical vortices that illustrate how light spins and orbits, respectively. The study includes a detailed examination of light polarization and introduces a number of innovative measurement techniques. It also extends the research on optical vortices by analyzing their interaction behavior with various types of inhomogeneous media. The comprehensive investigations are aimed at applications in sensing and communications.

Regarding light polarization, this dissertation presents a …

The Crash Consistency, Performance, And Security Of Persistent Memory Objects, Derrick Alex Greenspan

Graduate Thesis and Dissertation 2023-2024

Persistent memory (PM) is expected to augment or replace DRAM as main memory. PM combines byte-addressability with non-volatility, providing an opportunity to host byte-addressable data persistently. There are two main approaches for utilizing PM: either as memory mapped files or as persistent memory objects (PMOs). Memory mapped files require that programmers reconcile two different semantics (file system and virtual memory) for the same underlying data, and require the programmer use complicated transaction semantics to keep data crash consistent.

To solve this problem, the first part of this dissertation designs, implements, and evaluates a new PMO abstraction that addresses …

Adaptive Beyond Von-Neumann Computing Devices And Reconfigurable Architectures For Edge Computing Applications, Mousam Hossain

Graduate Thesis and Dissertation 2023-2024

The Von-Neumann bottleneck, a major challenge in computer architecture, results from significant data transfer delays between the processor and main memory. Crossbar arrays utilizing spin-based devices like Magnetoresistive Random Access Memory (MRAM) aim to overcome this bottleneck by offering advantages in area and performance, particularly for tasks requiring linear transformations. These arrays enable single-cycle and in-memory vector-matrix multiplication, reducing overheads, which is crucial for energy and area-constrained Internet of Things (IoT) sensors and embedded devices.

This dissertation focuses on designing, implementing, and evaluating reconfigurable computation platforms that leverage MRAM-based crossbar arrays and analog computation to support deep learning and error …

Development And Content Validation Of The Student Perception Of School Safety (Spss) Scale: An Expert Evaluation Of Item Relevance Ratings By Law Enforcement And School Guardians, Diana D. Scott

Graduate Thesis and Dissertation 2023-2024

There is "no one-size-fits-all solution" to school safety (Cybersecurity & Infrastructure Security Agency, 2022. p. 7). The growing number of school shootings and health problems at schools raise serious questions about the dimensions of school safety that should be measured. Prior extensive surveys measuring elementary student's views of safety in relation to relevant safety issues have not been conducted. There were four objectives for this study: 1) to investigate relevant dimensions of school safety and understand safety procedures that are currently in use; 2) to formulate and organize questions that would be approved to gauge elementary students' perceptions about school …

A Content Analysis Of The Mathematics Curriculum Progression For Students Taking Algebra I And Geometry Honors Before High School, Yeidi Diaz Reyes

Graduate Thesis and Dissertation 2023-2024

ABSTRACT

This qualitative content analysis study examined different middle school mathematics pathways from a large urban district in Florida to determine possible gaps in the accelerated pathways and differences between the district’s learning targets and Florida’s Benchmarks for Excellent Student Thinking (B.E.S.T.) Standards. Additionally, the accelerated pathways were compared to the Southern Regional Educational Board (SREB) 12 Indicators to identify possible missing content necessary to succeed in Algebra I Honors and Geometry Honors. The study aimed to answer three research questions: (1) In what ways do Florida’s B.E.S.T. Standards included in the non-accelerated and accelerated pathways for middle school mathematics …

An Ethnographic Study On How Mandated Curriculum Influences Mathematics Instruction At A State-Supervised School, Laura T. Pimentel

Graduate Thesis and Dissertation 2023-2024

This ethnographic study focused on understanding the culture and describing the experiences of elementary mathematics teachers as they used a mandated curriculum and scope and sequence at a state-supervised school. The scope and sequence was created and provided by the school district with the expectation of implementation with high fidelity by the Bureau of School Improvement within the state of Florida. This study used key informant interviews, Professional Learning Community observations, and classroom observations of mathematics teachers in grades three through five to analyze and describe how the school culture of planning and instruction influenced mathematics teaching. Findings suggest that …

Comprehensive Analysis Of The Intersection Between Cryptocurrency And Infrastructure Security, Ayodeji Adeniran

Graduate Thesis and Dissertation 2023-2024

Cryptocurrencies are experiencing a significant surge, with the total valuation surpassing two trillion US dollars at specific points. This remarkable growth is underscored by the existence of over 23,000 different cryptocurrencies as of 2024, according to CoinMarketCap. These digital assets aim to break down borders and enhance access to financial services, fostering a more inclusive global economy.

However, the swift ascent and widespread adoption of cryptocurrencies come with considerable risks. The growing popularity and promise of these digital assets have opened up new avenues for malicious actors. Cybercriminals are exploiting public infrastructures, the cloud, the metaverse, and various websites to …

Design And Perception Of Diverse Virtual Avatars In Immersive Environments, Tiffany D. Do

Graduate Thesis and Dissertation 2023-2024

Virtual humans and avatars have become integral components of immersive technologies, shaping various aspects of virtual worlds. This dissertation investigates the nuanced interactions between user demographics and virtual avatars, exploring their impact on perception, embodiment, and persuasive communication. The first study investigates the effectiveness of different speech fidelity levels in virtual humans, revealing gender-dependent perceptions of trustworthiness. Building on this, this dissertation introduces the \textit{Virtual Avatar Library for Inclusion and Diversity} (\textit{VALID}), offering a comprehensive resource for advancing racial diversity and inclusion in virtual environments. Through rigorous validation studies, we shed light on the perception of avatar characteristics worldwide, emphasizing …

Design Automation For Next-Generation In-Memory Computing Systems, Sven Thijssen

Graduate Thesis and Dissertation 2023-2024

Since the dawn of computing, all practical computing systems, from small laptops and cellphones to large mainframes and supercomputers, have been based on the Von Neumann architecture. In this architectural model, computing units and storage units are physically separated, requiring the computing system to spend most of its time and energy on moving data around. As many recently developed applications are driven by large volumes of digital data, the Von Neumann architecture does not scale well with today’s computational demands. In-memory computing using emerging non-volatile device technologies is a promising orthogonal approach as it mitigates the adverse effects of the …

The Impact School Discipline Policies Have On Disabled, Minoritized Students’ Drop Out Rates, Christopher B. Langley

Graduate Thesis and Dissertation 2023-2024

Despite progress in recent years, the K–12 education system still grapples with pervasive discriminatory and inequitable practices that hinder students’ learning experiences and future success. Such practices can have far-reaching consequences, threatening students’ long-term outcomes and putting their well-being at risk. This study delved into the effects of exclusionary practices on academic performance and student withdrawal, with a particular focus on minority students with disabilities. By examining archived data, this research analyzed various exclusionary practices, including in-school suspension, out-of-school suspension, Baker Acts, and law enforcement referrals. To uncover correlations and determine hypothesis acceptance, the study employedsophisticated statistical techniques such as …

What's In A Frame? Exploring State Policymakers' Conceptualization Of Human Trafficking., Alexis P. Tsoukalas

Graduate Thesis and Dissertation 2023-2024

Human trafficking within and across nations is a pervasive, insidious global criminal enterprise that endangers human rights and impedes social justice. Sex and labor are two fundamental types of human trafficking, but media and policies prioritize the former. Social work calls for empowering marginalized groups, and labor trafficking survivors—who are more likely women and immigrants of color—certainly fall into this category. Since 2003, every U.S. state has criminalized human trafficking, yet the issue persists. Most human trafficking analyses focus on federal or international, not state, policies.

Thus, this critical analysis aimed to explore how human trafficking is conceptualized at the …

The Perceived Impact Of Restorative Practice Implementation On Exclusionary Discipline Practicce And The Role Of School Administrators On The Effectiveness Of Implementation, Courtney E. Tomasi

Graduate Thesis and Dissertation 2023-2024

Restorative Practices is a behavior management system that focuses on root cause analysis and repairing harms caused by those infractions. This study focused on the correlation between the knowledge that stakeholders possessed regarding Restorative Practices and their perceived impact on the school disciplinary program. In addition, the study sought to determine which aspects of Restorative Practices were most effective as well as examine the viewpoints of disciplinary stakeholders regarding Restorative Practices as a large, urban school district in central Florida.

Recent literature shows that punitive and exclusionary discipline practices have an adverse impact on minoritized populations as the students are …

Using Advocacy Coaches To Examine Trauma-Informed Classroom Practices Used To Support Students With Disabilities: A Qualitative Study, Fanica Young

Graduate Thesis and Dissertation 2023-2024

Childhood trauma, often referred to as America’s hidden crisis, significantly impacts the learning and behavior of students with disabilities (SWD), in particular. SWD who experience or witness trauma face challenges related to discipline, academic achievement, absenteeism, and social and emotional well-being. According to the National Survey on Children’s Health (2021), 16.3% of children served under the Individuals with Disabilities Education Act have encountered two or more adverse childhood experiences by age 18, with over half of the states surpassing the national average. Addressing this urgent concern is difficult due to a shortage of qualified service providers, such as nurses, psychologists, …

Resilient Cooperative Control Of Cyber-Physical Systems: Enhancing Robustness Against Significant Time Delays And Denial-Of-Service Attacks, Deepalakshmi Babu Venkateswaran

Graduate Thesis and Dissertation 2023-2024

A cyber-physical control system (CPS) typically consists of a set of physical subsystems, their remote terminal units, a central control center (if applicable), and local communication networks that interconnect all the components to achieve a common goal. Applications include energy systems, autonomous vehicles, and collaborative robots. Ensuring stability, performance, and resilience in CPS requires thorough analysis and control design, utilizing robust algorithms to handle delays, communication failures, and potential cyber-attacks.

Time delays are a challenge in CPS, particularly in teleoperation systems, where human operators remotely control robotic systems. These delays cause chattering, oscillations, and instability, making it difficult to achieve …

A Causal-Comparative Study Of The Relationship Between School Shooter Typologies, Warning Signs, And Targeted School Violence, German R. Taveras

Graduate Thesis and Dissertation 2023-2024

This research explores the relationship between school shooter typologies, warning signs, and targeted school violence. The study's independent variables are school shooter typologies and warning signs, while the dependent variable is targeted school violence. The research wants to investigate whether a relationship exists between these variables. The null hypothesis states no relationship exists, while the alternative hypothesis suggests that a relationship exists. The research framework is based on Bronfenbrenner's Ecological System Theory, which helps understand how the environment and social interaction influence a child's development. The theory was influenced by Vygotsky's sociocultural theory—which focuses on the roles of human interactions …

Connecting In Crisis: Exploring Online Informal Communications In Florida’S Unemployment Struggle, Anna V. Eskamani

Graduate Thesis and Dissertation 2023-2024

The COVID-19 pandemic led to widespread unemployment, significantly impacting Floridians who faced delays and systemic issues with the state's unemployment system. This study examines crisis communication within a Reddit community, focusing on how individuals used informal communications to navigate the unemployment benefits crisis. Guided by Rhetorical Arena Theory (RAT) and Uses and Gratification Theory (U&G), the research addresses: (1) How did individuals in the active audience discuss challenges faced when trying to access Florida’s unemployment system? (2) What lessons can be drawn from the analysis of informal communications on social media for improving crisis communication strategies during future crises? A …

Investigating The Effect Of Technological Innovation On Countries' Green Production Capabilities Evolution And Spillover, Hanin Alhaddad

Graduate Thesis and Dissertation 2023-2024

This dissertation presents a novel methodology to examine the evolution of green production capabilities for 226 countries between 2003 and 2017 based on spillovers between the sectors. It identifies the growth potential of sectors and the key sectors driving the spillovers of production capabilities. Moreover, it delves into the patterns observed in the evolution of these capabilities, considering the diverse economic classifications. Lastly, it focuses on 72 developing countries that face unique challenges in pursuing green economic growth, exploring the effect of technological innovations on the spillovers of production capabilities within their green sectors. Three key hypotheses are investigated: the …

High-Performance Integrated Photonic On Thin-Film Lithium Niobate, Farzaneh Arab Juneghani

Graduate Thesis and Dissertation 2023-2024

Integrated photonics is in high demand for various applications, such as optical communication, microwave photonics, optical sensing, and quantum information processing. Different material platforms have been explored for implementing photonic integrated circuits (PICs), such as silicon, indium phosphide, lithium niobate (LN), and more recently thin-film lithium niobate (TFLN). Choosing a platform depends on the specific requirements of the application. TFLN offers numerous advantages, including very strong electro-optical and nonlinear optical effects, and a broad spectral range without significant material loss. Particularly, TFLN is suitable for high-speed and low-power electro-optical modulation. LN is a widely used electro-optic material in telecommunication and …

Examining How Pejorative Stereotypes About Black Women Shape Their Experiences In Physics Ph.D. Programs, Camille A. Coffie

Graduate Thesis and Dissertation 2023-2024

This research study is part of a larger study that examines the experiences of Black women in physics graduate programs to identify priorities for departmental change initiatives to remove structures that keep out and/or push out Black women. This research also reinforces the ongoing necessity to raise awareness about the impact of stereotypes on how Black women are perceived and how stereotypes affect the matriculation of Black women in physics graduate programs. Black women represent the lowest percentage of students in physics graduate programs and often contend with stressors like microaggressions, bias, and stereotype threats that impede their success and …

Scalable Transactions In Decentralized Networks, Zachary M. Painter

Graduate Thesis and Dissertation 2023-2024

The study of shared memory concurrency is extensive. There exist many state-of-the-art strategies for dealing with fundamental concurrency problems, such as race conditions or deadlocks, to leverage massive performance boosts out of modern multiprocessors. With the introduction of blockchain technology as a popular financial tool, we observe many decades-old concurrency problems re-emerge within the context of decentralized networks. These challenges introduce additional constraints, such as the lack of hardware atomic instructions like Compare-And-Swap, or the potential for malicious clients to join the network. In this dissertation, we propose key algorithms which adapt knowledge from the domain of shared memory concurrency …

The Role Of Adiponectin In Gustatory Perception Of Fat, Fangjun Lin

Graduate Thesis and Dissertation 2023-2024

Taste is a major driving force that influences food choice and dietary intake. Animals' taste abilities vary due to genetics, sex, age, and hormonal status. There is evidence that several appetite-regulating hormones can modulate gustatory detection of fat, and this hormonal modulation of fat taste likely influences food palatability and selection, thereby altering fat intake. Adiponectin is a key metabolic hormone predominantly released from adipose tissue, which enhances insulin sensitivity and stimulates glucose and fatty acid metabolism. Adiponectin receptors are highly expressed in the taste system, indicating that adiponectin signaling may play an important role in the modulation of gustatory …

Sexual Assault Victimization In Virtual Worlds, Narim Lee

Graduate Thesis and Dissertation 2023-2024

The current dissertation investigated sexual assault victimization in virtual worlds – environments, where individuals engage through avatars, offering a deep level of immersion and interactivity. As the usage of these virtual spaces grows, so does the concern for negative experiences that mirror the sexual assault encountered in the physical world. Despite this, there is a notable gap in the quantitative analysis of virtual sexual assault (VSA) victimization. This research aimed to fill this void by exploring the prevalence of VSA victimization over the previous year and identifying potential predictors of VSA victimization through the lens of cyberlifestyle-routine activity theory. To …

Globalizing Tele-Support Coaching: Exploring The Impact Of Online Adaptations Of Practice-Based Coaching For Special Education Teachers And Related Personnel, Danica Tania Moise

Graduate Thesis and Dissertation 2023-2024

The global prevalence of autism spectrum disorder (ASD) presents significant challenges, particularly in low- and middle-income countries (LMIC) where there is a lack of trained professionals, limited access to evidence-based practices, and insufficient government support. This dissertation explores the potential of technology-based interventions to bridge the knowledge gap and improve the quality of services for children with ASD in LMIC.

The first chapter provides an overview of the current landscape of educator preparatory programs and highlights the limitations of traditional clinical experiences in preparing special education teachers and related personnel. It introduces the Tele-Support Coaching Framework (TCF) as a promising …

Evidence Of Positive Associations Between Intertidal Shoreline And Subtidal Seagrass Communities In A Subtropical Ecotone, Gabriel Benson

Graduate Thesis and Dissertation 2023-2024

Fringing seagrass beds are important components of coastal ecotones. Their association with shoreline morphology and shoreline restoration, however, is poorly understood. We combined GIS analyses with field-based monitoring to better understand intra-ecotone associations between shorelines and fringing seagrass beds. Using GIS analyses of aerial imagery, shoreline characterization models, and seagrass coverage models, the relationship between shoreline morphology, erosion, and fringing seagrass persistence was examined in Mosquito Lagoon, FL between 2011 and 2021. For the field-based portion of the study, fringing seagrass beds growing adjacent to restored, living shoreline segments were monitored throughout the 2023 growing season (March – November). All …

Mesmerizing Moon Mysteries: Unraveling The Compositions Of Irregular Mare Patches (Imps) Using Remote Observations, Nicholas G. Piskurich

Graduate Thesis and Dissertation 2023-2024

Compositional characterization of lunar surface features informs our understanding of the Moon's thermal and magmatic evolution. We investigated the compositions of hypothesized volcanic features known as irregular mare patches (IMPs) and their surroundings to constrain formation mechanisms. We used six datasets to assess the composition of 12 IMPs: 1) Moon Mineralogy Mapper (M³) derived spectral parameters (e.g., band center positions, shapes), 2) Lunar Reconnaissance Orbiter (LRO) Diviner Radiometer Experiment (Diviner) measured Christiansen feature (CF) position, 3) SELENE (Kaguya) Multiband Imager (MI) FeO abundance, 4) Clementine 5-band (Ultraviolet/Visible)-derived FeO abundance, 5) LRO Wide Angle Camera (WAC) TiO₂ abundance, …

Spatial Variability Of Hydrodynamics Within Crassostrea Virginica (Eastern Oyster) Reefs: Investigating The Effect Of Canopy Density On Flow And Turbulence., Manisha Thenuwara

Graduate Thesis and Dissertation 2023-2024

Oysters are ecosystem engineers that shape coastal aquatic environments through hydrodynamic influence, which is governed by the reef structure. Hydrodynamic studies have investigated effects of oyster reefs as whole systems, overlooking the spatial variability inherent in canopy structures. In this research, a field investigation was undertaken to characterize spatial variability of flow dynamics within a single eastern oyster (Crassostrea virginica) reef and query how the local canopy density influences the hydrodynamic environment. High-resolution flow measurements were taken within and above the oyster canopy over a range of flow conditions. Hydrodynamics were compared across reef locations as the oyster …