Digital Commons Network^™

Plant Trait Effects On Tidal Wetland Methane Emission, Adam M. Dunn

Theses and Dissertations

High rates of carbon (C) sequestration exhibited by coastal wetlands is an important natural climate solution to global environmental change. At the same time, however, wetlands are the largest natural source of methane (CH₄) to Earth’s atmosphere, a potent greenhouse gas that influences the global climate. Wetland CH₄ emissions display high degrees of uncertainty in accounting for spatial and temporal variations in emissions due to the complex interactions between biotic and abiotic factors that influence methane production and transport, in addition to simultaneous influences from climate-driven effects on wetlands such as rapid sea level rise and increased …

Probing The Porphyromonas Gingivalis Nitrosative Stress Response Network, Alexandra Galina

Theses and Dissertations

Objective: To persist in the oral cavity, the perio-pathogen Porphyromonas gingivalis must have an efficient nitrosative stress response mechanism. To better understand how P. gingivalis responds to nitrite (NO₂^-) we must determine what genes are involved in the nitrosative stress response network.

Methods: Through genomic screening, a list of genes was generated that were hypothesized to be part of the nitrosative stress response network and believed to be involved in nitrate/nitrite metabolism or redox state of the cells. Protein coding regions were replaced with the ermF sequence by allelic exchange mutagenesis. 15 mutants were created …

Radiation Shielding Effectiveness Of Hafnium Diboride (Hfb2) Reinforced Epoxy Composites For Enhanced Radiation Protection And Safety, Furkan Erdogan

Theses and Dissertations

This thesis investigates the radiation shielding effectiveness of hafnium diboride (HfB2) reinforced epoxy composites, with the aim of enhancing radiation protection and safety in various applications. The study focuses on the development and characterization of HfB2-epoxy composites with varying weight percentages of HfB2 nanoparticles, as well as on the evaluation of their shielding effectiveness against gamma rays and thermal neutrons. The radiation shielding performance of the composites is assessed using gamma-ray spectroscopy and neutron counting, and the neutron attenuation efficacy is compared with that of 5% borated high-dense polyethylene. The results indicate that the HfB2-epoxy composites exhibit promising radiation shielding …

Intersect- On The Corner Of Princess Anne And William, Madison M. Goff

Theses and Dissertations

After a worldwide pandemic, perspectives towards personal space and private quarters have shifted. Social distancing procedures during COVID-19 altered the use of space, even after vaccinations have been administered. After limits on large gatherings and keeping 6 feet away from each other, what is the expectation that people hold now when in public?

Research will include interviewing the intended user groups (students and travelers), designers who are familiar with hospitality and hostel design, and hospitality professionals. The perspective on private and public space has shifted after the pandemic, so a survey will target hostel age groups that could help understand …

Advancing Our Understanding On The Role Of Bromodomain Phd-Finger Transcription Factor (Bptf) In Cancer Through The Analysis Of Publicly Available Databases., Preksha Jerajani

Theses and Dissertations

The initiation and progression of cancer are significantly influenced by genetic factors, and despite ongoing research, a definite cure for this disease remains elusive. Over time, researchers have explored various genes as potential targets for treating various types of cancer, and numerous innovative therapies continue to be developed. General chemotherapies face their own challenges like recurrence, while cancer specific drugs face the challenge of metastasis. Therefore, therapeutic strategies have slowly started to shift towards comprehending the pathways and corresponding genes that may be implicated in multiple types of cancer, with the aim of identifying more effective targets for drug development. …

Interiorization And Localization: An Analysis Of Immigration Enforcement In Local Contexts, Manuel N. Leiva

Theses and Dissertations

Immigration and Customs Enforcement (ICE) is a federal agency that plays a large role in surveilling, apprehending, detaining, incarcerating, and deporting undocumented immigrants in the United States. Due to constraints on the number of ICE’s available personnel and resources, the agency relies on deputizing, or devolving to local law enforcement agencies the authority to enforce federal immigration policies. Prior to the 1990s, the enforcement of policies directed at controlling flows of undocumented immigrants was generally under the purview of federal law enforcement agencies and administrators, not state or local ones. The attacks on September, 11^th 2001 represented a flashpoint, …

Model Based Systems Engineering Approaches To Chemicals And Materials Manufacturing, Quang Le

Theses and Dissertations

Model-based systems engineering (MBSE) is part of a long-term trend toward model-centric approaches adopted by many engineering disciplines. This work establishes the need for an MBSE approach by reviewing the importance, complexity, and vulnerability of the U.S. chemical supply chains. The origins, work processes, modeling approaches, and supporting tools of the systems engineering discipline (SE) are discussed, along with the limitations of the current Process Systems Engineering (PSE) framework. The case is made for MBSE as a more generalizable and robust approach. Systems modeling strategies for MBSE are introduced, as well as a novel MBSE method that supports the automation …

The Game Of Absolute, Rupeng Zhao

Theses and Dissertations

My thesis paper writing is a collection of short stories. Or it could be thought of as a small magazine or even an instruction manual for my work. There is a loose correspondence between its content and the symbols used in my installations. It is also realistically and physically presented in my exhibition as part of a "game box". The chaotic and contradictory narrative of this collection of short stories stems from my exhaustive pursuit of the elements that I try to approach in each story. This insatiable pattern of compulsive organization is also evident in the content of my …

A Tenth Of A Second, Natalia Andrea Mejía Murillo

Theses and Dissertations

A Tenth of a Second is an installation that explores modes of cartographic representation of the universe, specifically the moon, in dialogue with poetic language. The work is based on research and reflection on disciplines such as astronomy and archaeology and addresses issues such as the fragility of the reference and categorization systems we use to approach reality, tactility and the body as a standard of measurement.

Crafting Community: A Ceramics Center, Nadia Mechboukh

Theses and Dissertations

For artisans, being part of a community can facilitate engaging with the public. Networking and collaborating with peers are vital for building meaningful relationships that can lead to mutual inspiration and learning opportunities. By strengthening the connection between society and various forms of craft, we can weave invisible threads that link the stories that craft tells with the time and place in which they were created. Pottery is a craft that has existed for thousands of years. Ceramics and clay have carried the history of communities and their ways of living through centuries and have been used as identifiers of …

Waiting To Exhale, Abigail H. Ogle

Theses and Dissertations

We breathe as a measure of time, it keeps us alive, and fabricates the pattern of our lives. We are punctuated by “snarls,” “glitches,” or moments of irregularity – of trying to catch one's breath, having it taken away, or gasping for it. It is the punctuation of sighs, huffs, sniffs, scoffs, screams, and deep intakes that appear as glitches in the breathing system.

In our daily rhythm of breathing, the presence of the glitch, defined as potentiality, can create space for something unexpected or new to arise. Using the wind from fans and approximately 1,260 square feet of silk, …

Role Of Histone Deacetylase (Hdac) In Epithelial To Mesenchymal Transition (Emt) In A Human Cholangiocyte Model Of Ischemic Cholangiopathy, Priyanshi Pragnesh Parikh

Theses and Dissertations

Organ transplants are a vital intervention for many diseases that result in end stage organ failure. Currently, the donation pool is not meeting the demands of the transplant list. Expanding this pool to include donation after cardiac death (DCD) is highly sought-after. However, the use of DCD livers can lead to increased odds of graft failure and ischemic cholangiopathy. The loss of epithelialization and fibrosis that occurs during ischemic cholangiopathy is characteristic of these cells undergoing epithelial-to-mesenchymal transition (EMT). The biological changes the cell experiences enhance migratory capacity, invasiveness, and increased resistance to apoptosis. Our earlier studies have shown differential …

Formal And Full Of Feeling, Kaitlyn Paston

Theses and Dissertations

Formal and Full of Feeling presents research and artistic work leading up to the thesis exhibition Come as you are, expanded in the Anderson Gallery May 2023. My research investigates the relationship between body and images. The research is presented as a journey guided by prompts, in pursuance of an aesthetic language to represent my experience of being a body. I discuss the animation process, research trajectories, installation of the exhibition and artworks that influenced the concepts.

Motivations Of Adult Patients Seeking Orthodontic Retreatment, Scott V. Philips

Theses and Dissertations

Objective: The aims of this study were (1) to compare the reasons adult patients seek orthodontic first-time treatment to the reasons adult patients seek orthodontic retreatment, and (2) to compare the concerns, motivations, and satisfaction levels of adult patients seeking orthodontic retreatment across the different previous treatment provider types of orthodontist, general dentist, and Direct-to-Consumer company.

Methods: At their initial orthodontic visit, adult patients (N=108) were invited to participate in the digital survey (REDCap) study. Subjects were recruited from the graduate orthodontics clinic at Virginia Commonwealth University and seven private orthodontic practices across the United States. Visual Analogue Scales were …

Mechanisms Of Emulsion Destabilization: An Investigation Of Surfactant, Stabilizer, And Detergent Based Formulations Using Diffusing Wave Spectroscopy, Jordan N. Nowaczyk

Theses and Dissertations

Conventional approaches for studying emulsions, such as microscopy and macroscopic phase tracking, present challenges when it comes to establishing detailed mechanistic descriptions of the impact of emulsifier and stabilizer additives. Additionally, while a combination of sizing methods and macroscopic phase tracking can provide insights into droplet size changes and concentration, the use of multiple measurements can be cumbersome and error-prone. It is the focus of this work, to present a new method for studying water in oil (W/O) emulsions that involves using diffusing wave spectroscopy (DWS) to examine the impact of three different surface stabilizing additives at varying concentrations. By …

Behind The Gate: Syrian Women In Soap Operas - Perception Vs. Reality, Tasnim J. Rahimah

Theses and Dissertations

Syria has witnessed what is known as al-fawra al-drameya, an eruption of drama since 2000. Every year, especially during Ramadan, dozens of Syrian soap operas are aired across the Arab world and beyond, depicting Syrians’ historical struggles as they fought for liberation from the French mandate at the beginning of the 20th century. Although women of those days were a vital part of that liberation movement and had prominent societal roles, these historical fiction soap operas chose to portray only the demure and dismissive female figures and not mention the women who were independent, courageous, and active members of the …

Discovery: A Visual Arts Elementary School, Cindy J. Perdomo

Theses and Dissertations

On average, school-age children spend more time in the classroom environment than they do at home. Why not provide environments that stimulate children’s curiosity to learn through visual arts? Including visual arts in educational programs can enhance students’ cognitive development, problem-solving abilities, cultural awareness, and critical thinking skills.

As someone who has attended various public schools in Florida, I’ve found that incorporating arts education into the curriculum can enhance students’ overall engagement with learning. Unfortunately, many students lack access to arts education due to a lack of funding and resources. Traditionally, the arts have been viewed as an opportunity for …

Investigating Actor Speech Training History Through The Lens Of Knight-Thompson Speechwork: How A Nonprescriptive Approach Revolutionizes The Field And Applications Outside Of A Theatrical Context, Harrison G. Runion

Theses and Dissertations

Speech training for actors in the United States has a history deeply rooted in prescriptive practices. Many speech trainers have and still do teach from a model that they consider to be the “correct” way to speak. These practices have proven to be quite damaging to students’ emotional and cultural identities, as speech is an inherent part of who we are as individuals. This thesis first examines such speech training pedagogies of the past, specifically the progression of William Tilly’s World English to Edith Skinner’s Good American Speech. Doing so establishes the necessary contextual understanding required to provide an alternative …

Welcome To The Sitting Garden At The Busy Hands Museum, Stacie Sabady

Theses and Dissertations

I wanted to attend VCU to learn how to unravel my mind and find the words to describe it. While I did make progress in that area, my surprise discovery is that I need to unravel my body too. It has become unbalanced from years of neglect. When working, I find solace through escape. I find a positive outlet for my perfectionist tendencies. I find a way to visually illustrate my obsessive qualities. Throughout the years of these findings, I have ignored my body pleading with me to take it easy. I have always honored the materials and the tools, …

Rooted In Between, Manavi Singh

Theses and Dissertations

Rooted in Between is a personal project that explores the complexities of belonging and the emotions that come with navigating between spaces that we call home. This written thesis is in support of the carefully curated video based and photographic work presented at an exhibition of the same title. The project's primary objective is to delve into the physical and emotional baggage that we carry with us as we move from one place to another. The project highlights the coping mechanisms adopted by the different generations in my family while struggling to find a place where we truly belong.

Profiles Of Family Functioning In Pediatric Hematology-Oncology Patients: Longitudinal Associations With Child Well-Being, Sydney Sumrall

Theses and Dissertations

This study aims to assess 1) patterns of family functioning and 2) longitudinal associations between family functioning patterns and well-being in a vulnerable cohort of children with chronic illness. Caregivers of hematology (16.4%) and oncology (83.6%) patients ages 7-20 (N=55; M_age = 13.3 [SD = 2.7]; 52.7% female; 45.5% non-Latinx White, 38.2% Black or African American, 12.7% Latinx, 1.8% Asian, and 1.8% multi-racial,) reported on family functioning via the Family Assessment Device. Cluster analyses identified three mutually exclusive clusters: one high adaptive group, one moderate adaptive group, and one maladaptive group. Group membership was not significantly …

Frewayni's Garden: Preserving Tigrayan Culture During A Period Of Ethnocide, Gabrielle F. Tesfaye

Theses and Dissertations

The recent and ongoing genocidal war in Tigray, Ethiopia, has witnessed the destruction and looting of countless historical religious sites, ancient manuscripts, and artifacts, leaving Tigray’s remaining cultural heritage extremely vulnerable. Such cultural loss erases a shared understanding across generations, robbing them of their history and identity. My work contributes to the safeguarding of Tigray’s cultural heritage and collective memory, informed by literature on cultural preservation efforts in post-war societies, and a series of interviews with Tigrayans in the diaspora and in Ethiopia.

The outcome of this thesis is embodied in a series of distinct jebenas, traditional Tigrayan clay coffee …

Illusion: Immersive Experience, Tessa S. Trowbridge

Theses and Dissertations

Can society learn from art, and if so, what type of knowledge can be gained from art? It is currently understood that art and design can help humans explore, discover, and understand philosophical and imaginative topics. There is a general agreement that art can create insight and awareness in ways that logical and rational statements cannot, and from these unique interactions, humans can see the world with a new perspective (Worth, n.d.). This thesis will investigate the claim that art can inspire human imagination and allow viewers to gain insight into a surreal reality using designed, physically immersive spaces.

Immersive …

Epithelial Membrane Protein 3 (Emp3b) Is A Novel Regulator Of Sympathetic Nervous System Development In Zebrafish., Jessica M. White

Theses and Dissertations

Notable progress has been made in understanding the development of the neural crest (NC). Neural crest cells (NCCs) can be divided into 4-5 subpopulations. A major lineage among trunk NC derivatives are sympathoadrenal (SA) cells, which give rise to the sympathetic nervous system (SNS). Trunk NCCs follow a ventromedial migration pathway where signals derived from the dorsal aorta instruct migrating NCCs to a SA cell fate. Defects in NC development can result in syndromes known as neurocristopathies. Neuroblastoma is one of the most common forms of pediatric cancer affecting nearly 800 infants each year in the United States (Takita et …

Nuff Love: From Me To You, Katherine S. Thompson

Theses and Dissertations

The thesis exhibition, Nuff Love: From Me to You, explores the profound impact of diasporic memory on identity within the family structure, particularly for those who were born after immigration. This unpacking of memories is achieved through photographs, collages, and installations that reveal the distant and absent attributes that reside within the home. As a second-generation American of Afro-Jamaican descent, this thesis navigates how the dual identity becomes too complex and is never allowed to exist in a binary state. The constant state of in-betweenness between both cultures led to further questioning of selfhood beyond the Caribbean identity maintained by …

Poly(Tfema) Surface Coating Applied On Perovskite Thin Films Using Supercritical Carbon Dioxide., Kasey Handy

Theses and Dissertations

Perovskite-based solar cells face challenges with stability due to external environment conditions; especially moisture. A new production to counteract this is reported. Poly(trifluoroethyl methacrylate) is applied as a thin film to improve hydrophobicity of the CH3NH3PbI3 films; this post deposition treatment is processed using supercritical carbon dioxide accompanied by ethanol. The quality of the Poly(TFEMA) deposition is analyzed using Raman Spectroscopy and Scanning Electron Microscopy.

The Lived Experience Of Postpartum Sleep For Black And White Women, Ashley R. Macpherson

Theses and Dissertations

This qualitative study utilized a phenomenological research approach (van Manen, 1990), and intersectional feminist lens (Collins, 2000; Crenshaw ,1989; hooks, 2000), to uncover the lived experience of sleep in the postpartum period. Participants were 10 mothers who were less than 12 months postpartum. Data collection consisted of in-depth interviews. Data analysis procedures followed recommendations by van Manen (1990, 1997). In order to increase the trustworthiness and rigor of the study, the researcher engaged in reflexive journaling, member checking, and peer debriefing. The results were organized into six themes; 1) the importance of the sleep environment, 2) anxiety and hypervigilance, …

Physical Activity In Adolescents With And Without Adhd: Longitudinal Associations With Sleep, Adhd, And Internalizing Symptoms, Caroline N. Cusick Lowman

Theses and Dissertations

Adolescents with Attention-Deficit/Hyperactivity Disorder (ADHD) are at risk for developing clinically significant sleep problems and comorbid internalizing symptoms. Physical activity (PA) has significant positive associations with a variety of health outcomes, including sleep and aspects of mental health. As such, the US Department of Health and Human Services recommends adolescents receive at least 60 minutes of moderate-to-vigorous PA (MVPA) per day. However, it is unknown whether adolescents with ADHD have different patterns of physical activity compared to their peers. Importantly, it may be that PA can serve as a buffer between ADHD symptoms and development of comorbid difficulties with sleep …

Sleep And Health Behaviors In A Safety-Net Primary Care Setting, Sahar Sabet

Theses and Dissertations

Nearly half of all premature deaths in the United States are attributable to preventable and modifiable health risk behaviors. For decades, the leading behavioral health contributors to morbidity and mortality are tobacco use, physical inactivity, and alcohol consumption. Medication adherence is a relatively less studied yet critical interrelated health behavior that is tied to health and treatment outcomes. Sleep, an important pillar of health, is a daily and modifiable behavior that shows promise as a health behavior facilitator. Better understanding the dynamics of these modifiable health behaviors is essential for the improvement of health promotion, particularly among underserved populations (e.g., …

Sustaining Breaths For Restorative Rest: A Preliminary Evaluation Of Sleep, Mental Health, And Cognitive Function Following Hypoglossal Nerve Stimulation For Obstructive Sleep Apnea, Elliottnell Perez

Theses and Dissertations

Introduction: Obstructive sleep apnea (OSA) is a sleep-related breathing disorder that produces repetitive obstruction or collapse of the upper airway. Positive airway pressure (PAP) therapy is the gold standard treatment for OSA. Hypoglossal nerve stimulation (HNS) is considered an alternative treatment for patients who are unable to tolerate PAP therapy. The purpose of the study was to examine sleep, mental health, and cognitive health outcomes before and after HNS to determine its viability as an alternative treatment.

Methods: The study utilized a single-group, pretest-posttest design. Objective and subjective sleep was measured using actigraphy, sleep diary, and questionnaires. Objective and subjective …