Digital Commons Network^™

A Greener Way To Synthesize Biodiesel: Mechanochemistry With No Added Catalyst, Amanda S. Tanner

Graduate Thesis and Dissertation post-2024

Biodiesel production is currently energy-demanding and produces large volumes of waste despite being marketed as a greener approach to fuel. Here, we report the development and analysis of a more environmentally friendly way of producing biodiesel via mechanochemistry. In as little as one hour, biodiesel can be produced by ball milling intact oilseeds with methanol and no added catalyst. The catalyst for transesterification of oilseeds and methanol via mechanical milling comes from within the seed shells, rather than needing to be added from a separate source. The metals found in the milling media interact with lignin in the seed shells, …

Sub-Cycle Nonlinear Optics In Solids, Dipendra Khatri

Graduate Thesis and Dissertation post-2024

The rapid advancement of digital electronics and telecommunication systems necessitates processing information at increasingly higher speeds. However, modern semiconductor technology faces fundamental physical limitations in transistor miniaturization and clock frequency due to quantum mechanical constraints. To overcome these barriers, ultrafast optoelectronics, leveraging light-matter interactions, offers a promising alternative. Light, as the fastest carrier of information, enables signal processing at frequencies far beyond conventional semiconductor technology. Advancements in laser technology have enabled stable and reliable ultrashort light pulse sources, lasting only a few femtoseconds at optical wavelengths. When utilized for signal processing, they could enable clock frequencies over 1000 times higher …

Ab Initio Studies Of Electrochemical Processes: Insights Into Co2 Reduction And Hydrogen Evolution Reactions, Theodoros Panagiotakopoulos

Graduate Thesis and Dissertation post-2024

The urgent need to reduce greenhouse gas emissions has spurred intense interest in sustainable technologies that enable both carbon dioxide (CO2) utilization and hydrogen production. This thesis explores these challenges through a combination of electrochemical simulations, surface science, and experimental validation. Central to the study is the electrochemical CO2 reduction reaction (CO2RR), which offers a promising route for converting CO2 into fuels and chemicals using renewable electricity. We begin by addressing the limitations of traditional modeling approaches for electrochemical systems. A hybrid explicit-implicit solvation model (SOLHYBRID) and an electrode potential control algorithm (TPOT) were developed to simulate the electrochemical interface …

Optomechanical Interactions And Dynamics In Nanoparticle Systems, Sohila Abdelhafiz

Graduate Thesis and Dissertation post-2024

This dissertation investigates the coupling between optical forces and the dynamics of nanoparticle systems. Using theoretical models, simulations and experiments, we explore how light mediates interactions between nanoparticles leading to optical binding, nonreciprocal forces, and collective behavior in colloidal suspensions.

We first examine the dynamics and interactions of particles under illumination due to complex electromagnetic forces. Of particular interest are interparticle forces between particles with specific optical properties such as those satisfying the Kerker scattering conditions. We demonstrate the wavelength-dependent dynamics of such Kerker dimers and establish conditions required for their stable longitudinal binding. We also describe a one-way non-reciprocal …

The Impact Of Virtual Backgrounds In Video-Mediated Selection And The Role Of Candidate Qualifications, Mira Gruber

Graduate Thesis and Dissertation post-2024

Videoconferencing allows users to manage their self-presentation through virtual backgrounds that mask their immediate physical environment. Prior research suggests that backgrounds depicting professional home spaces (e.g., bookshelves) elicit more favorable impressions than those that depict personal home spaces (e.g., bedrooms). Expectancy Violations Theory (EVT) provides a framework for understanding such effects. The present dissertation applied EVT to video-mediated selection interviews, that have become increasingly popular since the COVID-19 pandemic. Given the strict expectations for professionalism in interviews, virtual backgrounds that deviate from such expectations may negatively impact hiring decisions. Consequently, this work examined the impact of two virtual background types, …

Sexual And Gender Minority Identity Acceptance And The Role Of Florida Legislation Perception On Medical Disclosure And Risky Health Behaviors, Aubrianna L. Stuckey

Graduate Thesis and Dissertation post-2024

Recently, across the United States, efforts have been made to remove protective legislation and resources surrounding the sexual gender minority (SGM) community (Woodford et al., 2018). Given how quickly Florida’s HB 1557 legislation was passed and the corresponding, ongoing attempts to expand the bills, there is limited research exploring the role of legislative change on SGM communities. Newer literature indicates that discriminatory laws or bills have impacted the mental health of the SGM community, especially among SGM adolescent and young adults ; however, research exploring the role legislation has on SGM individual’s physical health, requires further investigation(American Psychological Association, 2023; …

Impacts Of Susceptibility To Peer Influence And Fomo On Viewing Alcohol-Related Content On Social Media, Alcohol Expectancies, And Alcohol Use, Callie L. Wang

Graduate Thesis and Dissertation post-2024

PURPOSE: Young adult (YA) alcohol use remains a significant public health problem, and may be influenced by alcohol expectancies developed through exposure to peers’ alcohol related content (ARC) on social media. This study examined the associations among ARC exposure, alcohol expectancies and alcohol use among YAs, and how susceptibility to peer influence and Fear of Missing Out (FoMO) may influence these relations. METHOD: YAs in the United States who endorsed consuming 1-2 standard drinks per month (N=371) completed surveys measuring ARC exposure, alcohol expectancies, susceptibility to peer influence, FoMO, and alcohol use at baseline and at 4- and 8-week follow …

The Role Of Social Media On Attention Deficit/Hyperactivity Disorder, Self-Esteem Imposter Phenomenon, And Identity Distress, Julie Hall

Graduate Thesis and Dissertation post-2024

This thesis explored the relationships between Attention-Deficit/Hyperactivity Disorder (ADHD), self-esteem, masking, Imposter Phenomenon (IP), and identity distress, along with the role in which social media integration plays in these relationships. Participants (N = 500) were recruited through SONA, a research recruitment database, and completed an anonymous online survey for course credit. Those who met the DSM-5 -TR criteria for ADHD had higher levels of IP, integration of social media, and Identity Distress, but lower levels of self-esteem compared to students who did not meet criteria for ADHD. This study is the first to explore the link between ADHD and …

Men’S Aggressive Responses To Sexual Rejection: The Roles Of Rejection Sensitivity, Alcohol Use, And Perceived Injustice, Cameron A. Davis

Graduate Thesis and Dissertation post-2024

PURPOSE: Sexual rejection can be often associated with an aggressive response. Prior research has identified rejection sensitivity as a risk factor for aggressive behavior, however, it has not been investigated in the context of sexual rejection. Highly rejection sensitive men may attend to negative cues, feel “betrayed,” and respond aggressively, especially after consuming alcohol.Thus, the goal of this study was to investigate the perpetration of aggressive responses to sexual rejection by examining the roles of rejection sensitivity, perceived injustice, and alcohol use in a sample of young adult men. METHOD: Men (n = 447) who endorsed one lifetime …

Digital Biomarkers Of Usability, Steven Ford

Graduate Thesis and Dissertation post-2024

Usability, the extent to which a product can be used with satisfaction and efficiency, is critical for its success, yet traditional assessment methods are often subjective or resource-intensive. This dissertation adapts the concept of digital biomarkers—objective, quantifiable data typically used to inform health outcomes—to summative usability assessment. By examining passively collected mouse and eye movement data, this research pinpoints reliable digital biomarkers that forecast subjective usability ratings, effectively assessing the 'health' of digital systems. Three studies were conducted to demonstrate that metrics based on eye and mouse-cursor movements can accurately predict standard usability survey scores across a wide array of …

Examination Of Driving Experience, Hazard Perception & Distracted Driving: Going Beyond Individual Factors By Using A Social-Ecological Framework, Alejandro A. Arca

Graduate Thesis and Dissertation post-2024

This research included two studies that examined the roles of nomophobia, driving experience, distraction presence, and hazard presence on driving behavior. In Study 1, a hazard perception task was used to assess participants’ hazard perception accuracy rate and reaction time. Results showed that novice drivers displayed significantly higher levels of nomophobia and lower self-efficacy scores, divided attention, and working memory scores compared to their experienced counterparts. Furthermore, the results also showed that novice drivers reported faster reaction times to hazards, which may be associated with poor impulse control as previously reported in the literature. Study 2 was conducted to further …

The Role Of Substance Use And Objectification On Bisexual Women’S Sexual Violence Experiences, Rachel Cooper

Graduate Thesis and Dissertation post-2024

Bisexual women experience the highest rates of sexual violence victimization, across all tactics, compared to all other gender and sexual orientation groups. Bisexual women’s higher rates of substance use puts them at greater risk for substance-facilitated sexual violence, however this does not account for higher rates of sexual violence that happen through other tactics. Objectification theory states that people learn to view women as sexual objects, whose value derives from their bodies’ sexual utility and this view increases the likelihood of sexual violence. Bisexual women experience an additional form of objectification in the form of bisexual stigma which is characterized …

Exploring Fake News Detection: Unpacking Polarization, Ambiguity, And Associated Neural Mechanisms, Shayna R. Soares

Graduate Thesis and Dissertation post-2024

A pertinent next step in investigating fake news, is exploring the inherent ambiguity of news headlines through the lens of uncertain decision-making theories. Few studies have done so while investigating the established neural correlates associated with uncertainty in the prefrontal cortex (PFC). A set of three studies was conducted examining the underlying neural mechanisms associated with ambiguity of news headlines, individuals’ polarization, and their decision behavior. Study 1 validated news headlines in terms of ambiguity (1-7 scale). Experiment 1 investigated choice behavior in an uncertain decision task with ambiguous news headlines, while recording activation in the prefrontal cortex using fNIRS. …

Leading The Newsroom: Exploring The Development Of Management And Leadership Skills In College Journalism Students, Guilherme Hiray Leal

Graduate Thesis and Dissertation post-2024

The purpose of this study is to examine the management and leadership skills that are developed in college journalism and how that experience and training prepares students for the challenges of reporting for, managing, and leading in today’s journalism businesses. I explored leadership (e.g. influence in the newsroom culture) of young journalists in student media, such as what skills are being emphasized by their advisers. This study utilizes gatekeeping theory to connect its main points with leadership-related characteristics. Findings show that the support and training students in student media receive are more directly related to management as opposed to leadership. …

Applying The 5d Model Of Country Image For International Public Relations: Analyzing Cultural Perceptions Of Qatar’S International Events "Expo 2023", Taleb Al-Adbah

Graduate Thesis and Dissertation post-2024

Studying country image in public relations has become essential to developing practices for countries engaging with international audiences. Hosting international events highlights the need for international public relations, where the country must adapt its culture and create culturally sensitive strategies to communicate effectively with individuals from diverse cultural backgrounds (Edwards, 2018). In this dissertation, Expo 2023 was employed as an international event to analyze Qatar’s country image among foreign and Qatari audiences. The dissertation aimed to understand the differences between their perspectives on Qatar and determine whether cultural tendencies impacted the country’s image. Additionally, the relationship between intercultural competency and …

Assessing The Accuracy Of Emotion Classification Of Whisper V3: Comparing Performance On Speech Emotion Datasets For Both English And Arabic, Oumaima Khalfi

Graduate Thesis and Dissertation post-2024

This thesis investigates the application of Whisper V3 which is a state-of-the-art, multilingual automatic speech recognition model to Arabic Speech Emotion Recognition (SER). Building on the foundational work of Muhammad Firdho, who adapted Whisper architectures for emotion classification tasks, this study extends his approach to the context of Arabic, a language characterized by rich dialectal diversity, complex morphology, and unique prosodic features.Although Whisper V3 was primarily designed for Automatic Speech Recognition (ASR), its latent representations appear to capture paralinguistic cues that can be leveraged for emotion classification. Muhammad Firdho laid the basis for this study by showing the ability of …

The Stigmatization Of Autism – Why It’S Still Present And How It Affects Women And Individuals Assigned Female At Birth (Afab), Emma Drauer

Honors Undergraduate Theses

The intent of this thesis is to explain some key factors (the theory of mind notion and the narrow perception of autism) that contribute to the stigmatization of autism and the impact this has on autistic women. Autistic women are heavily underrepresented, especially in the scholarly discourse, so this thesis collected first person accounts of autistic experiences through a survey and interviews. This data revealed important information such as the benefits of a diagnosis, how stigma can prevent this and have consequences, and the struggles autistic women face. Unmasking these struggles can help make the general public aware of their …

The Intersection Of Autism Spectrum Disorder And Mental Health: A Focus On College Students, Sudeepta Matha

Honors Undergraduate Theses

Rising prevalence rates of autism spectrum disorder (ASD), changes in diagnostic criteria, and increased public awareness have all contributed to the growing population of college students with ASD. However, many individuals - commonly referred to as the “lost generation” - go undiagnosed, due to experiencing negative interactions with mental health professionals. As a result, these individuals are not given the proper support and interventions required for a successful transition into adulthood, and often face heightened social isolation, academic problems, mental health challenges compared to their neurotypical peers. A combination of these factors can lead to increased suicidal ideation (SI) and …

The Yeasty Rise Of Conservatism By Fermenting Sourdough, Sydney M. Mcrae

Honors Undergraduate Theses

Baking has become increasingly popular in the last five years, particularly baking sourdough bread. This is evident through the rise of social media influencers focusing on trad-wife, family, and sourdough content. Trad wife is the term used to describe a a woman who lives a lifestyle that endorses gender roles, child-rearing, and taking care of the family. There is significant crossover between American social conservative ideals and a trad-wife. The emblem for a tradwife has become baking sourdough since the coronavirus pandemic. Previous research has linked the correlation between American social conservatism and the increasingly popular trad-wife phenomenon. Existing literature …

Uv- Altered Macrophages: Impact Of Uv Radiation On Phagocytic Receptor Expression In M2 Macrophages And Implications For Tissue Repair And Immunosuppression, Hala Hafez

Honors Undergraduate Theses

Ultraviolet radiation is an environmental stressor known to suppress immune function in the skin, but its effect on the immunoregulatory M2 phenotype macrophages is poorly studied. This study aims to investigate the impact of UV exposure on key markers of the M2 macrophage, which are critical for tissue repair and immunosuppression. THP-1 monocytes were differentiated and polarized into the M2 phenotype using Phorbol-12 myristate (PMA) and Cytokines IL-4 and IL-10. Once differentiation was confirmed, the macrophages were exposed to varying durations of UV radiation. Real Time Quantitative PCR was used to analyze expression changes in phagocytic receptors (CD206, CD163, Arg-1), …

Flame Boundary Effects Of Hydrogen-Air Premixing, Alecson L. De Lima Junior

Honors Undergraduate Theses

The objective of this research was to investigate the reaction of hydrogen and heated air premixing when injected into a combusting ethylene-air crossflow, and to study the flame stabilization location with varying premixing levels. The main parameter of this investigation was the flame stabilization diagnosed through chemiluminescence, based on recorded equivalence ratio, temperature, and flame boundaries, and maintaining a constant air temperature, hydrogen and air mass flow, and momentum flux ratios. Testing was conducted at different ratios of hydrogen and air premixing achieved through alternating the distance between the point where hydrogen and air are mixed and the combusting crossflow. …

Rhythm Against Poethics, Jayvyn Dacas

Honors Undergraduate Theses

This thesis stages an auto-poetic ethnography that listens to, and moves with, the anterior spaces of Black life. Those murmurs, hums, musical hesitations, and infrastructural vibrations that refuse capture by dominant epistemic regimes. Drawing from Ramon Amaro’s reading of Sylvia Wynter, Katherine McKittrick and Alexander Weheliye’s reflections on sound, Fred Moten’s insights on displacement, and Tendayi Sithole’s attention to the phonographic, the project situates music production as method and unworlding. Through engagements with the 808, sampling, sound systems, and embodied listening across Florida. Spaces like the warehouse, the party, record stores, and community become the work of Black voices, and …

A Story Of Oppression A Psychological And Creative Approach, Juan R. Morillo

Honors Undergraduate Theses

The aim of this project is to survey the manner in which oppression is expressed in selected works of literature. It is a topic that not only am I familiar with through my studies of literature and psychology, but one that I, as well as every Venezuelan expatriate has witnessed and felt for their country. The project focuses on social and political oppression, using the current Venezuelan crisis as a focal point, and selected literary sources as a framework. I will analyze dystopian classics such as George Orwell's 1984 and Ray Bradbury’s Fahrenheit 451, as well as Margaret Atwood’s The …

Exploring Electroweak Baryogenesis Within Real Scalar Models: Theoretical Foundations And Collider Phenomenology, Corine M. Smith

Honors Undergraduate Theses

The matter–antimatter asymmetry and the hierarchy problem related to the Higgs boson mass remain key open questions in high energy physics. Electroweak Baryogenesis offers a solution to the asymmetry by modifying the Higgs sector to allow a strongly first-order phase transition. This work investigates two real singlet scalar extensions of the Standard Model, incorporating novel quartic and triple couplings between the new scalar fields, providing a testable framework for vacuum-induced scalar mixing effects and enhanced multi-Higgs boson production. These interactions modify the scalar self-coupling and can induce resonant enhancements in multi-Higgs boson production processes. The theoretical constraints are derived from …

University Of Central Florida Libraries 2023-2024 Annual Report, Cynthia S. Dancel

Libraries' Documents

No abstract provided.

Empowering Multilingual Families By Reconceptualizing Family Engagement, Melissa J. Cuba, Carolyn Waters, Luciana C. De Oliveira

Journal of English Learner Education

One of the most pressing issues in U.S. public schools is the engagement of multilingual families with children who are multilingual learners. So much so, federal policies, such as the Parent and Family Engagement Provisions in the Every Student Succeeds Act, prioritize and financially support activities and professional development focused on family engagement. In addition, these policies provide opportunities for families to contribute to agreed-upon school district policy that can reshape family engagement. However, as we reflect on the current sociopolitical context in the U.S., how are school systems creating opportunities for multilingual families to contribute and inform local family …

Digital Stories Of Resilience: A Case Study Of Urban Community College English Learners, Patricia George Hunter

Journal of English Learner Education

This study utilizes a qualitative case study approach to learn how project-based, digital storytelling (DST) voices the resilience of post-secondary English language learners (ELLs) attending a minority-serving, open-access, community college in New York City. Along with many studies that have examined the usefulness of DST in oral production, this research investigates whether project-based digital storytelling enhances students’ understanding of academic content related to resilience and conventional composition. Narrative inquiry (NI) research technique is the basis of the digital story project in an English as a Second Language (ESL) course. In this case, the study relies on observations and artifacts to …

Now I See: Video Supports For English Language Learners, Joanna C. Zimmerle, Hanrui He, Tara Hill

Journal of English Learner Education

General education teachers are often unprepared by teacher preparation programs and limited professional development opportunities to support English Language Learners (ELLs), despite the increasing number of ELLs entering US schools and the trend towards placing them in mainstream classrooms. Video resources offer one viable approach to supporting the language learning of ELLs, drawing upon theoretical frameworks such as dual-coding, constructivist theory, and sociocultural perspectives. This paper describes the use of video resources to assist general education teachers in effectively leveraging videos to support the language learning of ELLs in mainstream classrooms.

Boundless Learning: Redefining The Library Experience - University Of Central Florida Libraries 2024-2027 Strategic Directions Bibliography, Rachel Vacek, Thomas R. Caswell, Tim Bottorff, Matthew Desalvo, Chereeka Garner, Athena R. Hoeppner, Arielle Petrovich

Libraries' Documents

No abstract provided.

Ucf Pegasus Plan - 3rd Grade - Maps And Regions Of The United States Of America, Madison D. Santos, Maggie Beck, Kylie Vandergriff, Courtney Pennock, Jennifer Campos

Pegasus Plans: Social Studies Unit Plans for Florida Teachers

During this unit, students will explore maps and their key elements through songs and fun activities. Students will also be exploring the United States of America and its 5 regions by exploring each region and its unique features with songs, books, and interactive activities.