Digital Commons Network^™

Mental Health Help-Seeking Behaviors And Service Utilization Of Black College Students, Troy J. Keys

Theses and Dissertations

Black college students are less likely to seek mental health services compared to other students. While previous research has identified barriers and facilitators contributing to Black college students’ help-seeking behaviors, the current political and social climate and pandemic have negatively impacted their mental health thus warranting the exploration of these factors again. This study aimed to identify the mental health help-seeking behaviors and attitudes of Black college students, the barriers and supports for help-seeking behaviors, their preferred service utilization providers, and their thoughts about promoting mental health help-seeking among their peers. Black college students (n = 21) enrolled at an …

Mindfulness, Moral Outrage, And The Climate Crisis: A Novel Approach Toward Motivating Pro-Environmental Behaviors, Erika Blair

Theses and Dissertations

The consequences of anthropogenic climate change are severe, continuously accelerating, and pose serious threats to the human and natural world. It is imperative to address the climate crisis from a psychosocial perspective and incite lasting, individual-level behavioral change. Various theoretical models have been adapted or developed to explain pro-environmental behaviors. However, the predictive powers of the most commonly used models have proven to be limited, and the underlying psychological processes of pro-environmental behavior constitute a significant gap in the literature. The present study identifies two psychological processes that show significant promise in motivating pro-environmental behaviors: moral outrage and mindfulness. Moral …

Investigating The Impact Of Chronic Inflammatory Pain On Ethanol Consumption In Mouse Models., Joshua L. Hunt

Theses and Dissertations

Chronic pain affects nearly 20% of Americans annually and for many alcohol provides a convenient and legally acquired palliative. Population-based studies have suggested a link between increased alcohol use and reduced pain, but chronic or excessive alcohol use potentiates the risk to develop alcohol dependence and neuropathy. However, sex differences in chronic pain and alcohol abuse are still not well understood. In the present study, we investigated whether chronic inflammatory pain using the inflammatory agent Complete Freund’s Adjuvant (CFA) model could alter ethanol consumption in male and female C57BL/6J mice. We observed that only CFA-treated male mice increased their ethanol …

Leaf To Canopy Functional Resilience: Plant Physiological And Carbon Cycling Stability Following Disturbances, Lisa T. Haber

Theses and Dissertations

Ecological disturbances impact core ecosystem functions, including production and biogeochemical cycling, by precipitating changes in biodiversity, physical environmental variables, vegetation structure, and functional trait distributions. As disturbance patterns intensify and abruptly transition to novel regimes under global change, future trajectories of ecosystem functions, including carbon (C) uptake and storage, are uncertain. A more complete understanding of the mechanisms underpinning ecosystem stability (or ability to return to baseline functioning) following disturbance is needed to forecast future C cycling.

Replicated ecosystem-scale disturbance experiments, particularly when coupled with modeling, are required to rigorously test hypothesized trajectories of ecosystem structural and functional change following …

Modeling The Radiation Shielding Effectiveness Of Hafnium Diboride Reinforced Epoxy Composites Using Mcnp, Randolph Snook

Theses and Dissertations

This thesis uses MCNP simulations to evaluate the performance of a radiation shielding material consisting of Hafnium Diboride (HfB₂) powder in an epoxy matrix. Comparing the results to previously measured data against both gamma and neutron sources, suitability for other applications can be confirmed. The model simulated the epoxy material with different weight percentages of HfB₂ and thicknesses. It was compared to other shielding materials such as pure epoxy and 5% Borated High Density Polyethylene (HDPE-B). The HfB₂-epoxy composite was tested against a wide energy range gamma spectrum from a ¹⁵²Eu source, and neutrons …

Who Is Responsible For Corporate Social Responsibility? Investigating Employees’ Roles As Agents Of Csr, Leah Alley

Theses and Dissertations

Corporate social responsibility (CSR) can be thought of as involving an interaction between two parties: one party who performs the socially good deed (i.e., the “agents” of CSR), and another party who is to receive its benefits (i.e., the “intended beneficiary” of CSR). Research on employee reactions to CSR largely focuses on employees’ reactions to CSR in general, which makes it impossible to assess how employees’ roles as agents and beneficiaries of CSR influence subsequent attitudes and behaviors. Theories of justice suggest that employee perceptions of CSR change when they are and are not the agents and beneficiaries of CSR, …

Exploring End-User Environments For The Control And Programming Of Collaborative Robots, Luiz Felipe Fronchetti Dias

Theses and Dissertations

To collaborate with the ongoing development of robotics, this thesis highlights three research contributions to collaborative robot programming. The first study evaluates block-based programming as an alternative for two-armed robots. A commercial solution is put in contrast with a block-based programming language. Both programming solutions are evaluated by 52 participants in an experiment involving a pick-and-place task. This study brings insights into human-robot collaboration, including robot positioning and interaction challenges. The second study discusses using mixed-reality devices as a potential workaround to the manual positioning of industrial and collaborative robots. Five different control interfaces implemented in mixed reality were used …

Explore Security And Machine Learning Applications In Next Generation Wireless Networks, Haolin Tang

Theses and Dissertations

Next-generation (NextG) or Beyond-Fifth-Generation (B5G) wireless networks have become a prominent focus in academic and industry circles. This is driven by the increasing demand for cutting-edge applications such as mobile health, self-driving cars, the metaverse, digital twins, virtual reality, and more. These diverse applications typically require high communication network performance, including spectrum utilization, data speed, and latency. New technologies are emerging to meet the communication requirements of various applications. Intelligent Reflecting Surface (IRS) and Artificial Intelligence (AI) are two representatives that have been demonstrated as promising and powerful technologies in NextG communications. While new technologies significantly enhance communication performance, they …

Energy Efficient Spintronic Devices For Non-Volatile Memory And Hardware Ai, Walid Al Misba

Theses and Dissertations

Nanomagnetic devices have emerged as a promising alternative to conventional complementary metal-oxide-semiconductor (CMOS) devices due to their low energy dissipation and inherent non-volatility. However, the widespread adoption of these devices requires high-density, high-speed, reliable, scalable, and energy-efficient technologies. This thesis investigates the use of nanomagnetic memory devices as both conventional Boolean memory and multistate memory for hardware AI applications.

Magnetic tunnel junctions (MTJs) are nanomagnetic memory devices that can be switched reliably and energy-efficiently using stress-mediated switching. However, realistic material inhomogeneity and scalability pose challenges for stress-mediated switching of MTJs scaled to lateral dimensions below 50 nm. We demonstrate that …

Effects Of Flooding And Plant Community Arrangement On Freshwater Wetland Greenhouse Gas Emissions And Plant Growth, Walker A. Trainum

Theses and Dissertations

Climate change threatens the status quo of tidal freshwater wetlands by altering their hydrology and species makeup. Increases in water level within freshwater wetlands are well studied, but with the inclusion of saltwater intrusion; while common for some tidal wetlands affected by sea level rise, it is not universal. For wetlands that will experience flooding apart from increases in salinity, adequate study is lacking. For these wetlands, the effect of increasing water level is largely unknown. Thus, the aim of this study was to use an outdoor mesocosm experiment to isolate effects of flooding and communities of differing species makeups …

Neurodevelopmental Trajectories As An Explanatory Mechanism For Adverse Mental Health Outcomes Following Child Maltreatment, Casey Burton Corso

Theses and Dissertations

Affecting one in every seven children in the United States, child maltreatment (CM) is a major public health issue associated with a myriad of adverse outcomes (e.g., alcohol and drug abuse, mental illness, interpersonal violence, sexual risk taking, etc.). While any subtype of CM (e.g., physical abuse, sexual abuse, emotional abuse, and neglect) increases the likelihood of subsequent psychopathology, heterogeneity in psychiatric sequelae of CM is associated with different CM subtypes. Elucidating the underlying mechanisms of this heterogeneity is vital for improving intervention and treatment of CM, and research aimed at accomplishing this is a critical need. One possible explanatory …

Hybrid Design Approaches For Reconfigurable Em Structures, Jonathan D. Lundquist

Theses and Dissertations

The modern world is replete with reasons for employing reconfigurable electromagnetic (EM) structures, but some of the most pressing needs require advancements in power consumption, speed, and footprint [1]. Next generation air defense (NGAD) fighters could benefit from new electronic warfare (EW) countermeasures [2], as well as adaptive stealth technology [3], while doctors could benefit from reconfigurable microwave ablation antennas that can modify radiation pattern and input impedance to match changes in tissue during ablation and account for variations in tumor shapes [4]. The future of antennas, filters, and lenses is reconfigurable as real-world matters of life and death may …

Bridging The Gap In Epsilon-Near-Zero Nonlinear Materials, Adam R. Ball

Theses and Dissertations

Studying how light and matter interact has been of interest to humans for thousands of years. From the invention of the first mirror, burning ants with a magnifying glass, to optical fiber communication, light has been central to mankind. Researchers have sought to take this to the extreme with nonlinear optics where intense laser light interacts with materials. The study of this thesis is to understand a new generation of materials that has come to light. Epsilon-near-zero (ENZ) materials have shown promise for ultrafast light manipulation in tandem with modern day CMOS compatible electronics. Here, I seek to bridge the …

Openfoam Computational Fluid Dynamic Modeling Of Plasma Expansion Into Vacuum, Robert B. Padgett

Theses and Dissertations

Nuclear weapons, and their effects, have been heavily studied with decades of data and information to create simulations and quantify the risks of their use. However, in the modern day, nuclear strikes pose new risks to precision electronics, power systems, and vital infrastructure. As such, simulations of nuclear weapon use are required due to nuclear weapon testing being prohibited. These simulations can incorporate testing practices, such as laboratory lasers, and computer simulation technology, such as OpenFOAM Computational Fluid Dynamics (CFD). The use of OpenFOAM CFD allows testing in an area that has never been tested with nuclear weapons before, specifically …

Fluid Flow And Thermal Performance Investigation Of Twisted Elliptical Tubes For Use In High Prandtl Number Systems, Connor F. Donlan

Theses and Dissertations

The development of clean energy systems is paramount to reducing mankind's climate impact. These clean energy systems include solar, wind, and nuclear power where nuclear power shows a reduced lifetime carbon dioxide footprint per kilowatt hour compared to other sources [102]. Advanced nuclear reactors, fusion energy systems, and concentrated solar power designers are looking at using molten salt heat transfer fluids and improved heat exchanger design to increase power production and efficiency of clean energy systems. The improving heat transfer within the main heat transfer components within advanced nuclear reactors will enable increased efficiencies and power production.

Heat transfer improvements …

Long-Wave Modeling Of Viscous Film Dynamics Inside A Tube With Time-Dependent Radius, Robert E. Hicks

Theses and Dissertations

Lung fluid dynamics is a well studied topic and relevant in the field of research surrounding patients with Chronic Obstructive Pulmonary Disease (COPD) and cystic fibrosis. However, the literature on the mathematical description of the net pulmonary fluid transport in the case of constricting and expanding airways is scarce. In this paper we aim to address how breathing contributes to airways clearance in patients with pulmonary diseases such as COPD and CF in which cilia do not function properly. We begin with the flow of a fluid-filled tube with rigid walls of fixed radius and the effects of gravity being …

Examining Parent Behavior And Adolescent Outcomes In A Pediatric Obesity Intervention, Madison W. Weinstock

Theses and Dissertations

Pediatric obesity is a major public health concern that affects over 14.4 million children and adolescents in the United States. Multiple short- and long-term health complications are associated with obesity. Therefore, effective treatment methods are needed in order to ameliorate the effects of said complications, particularly among adolescents. This dissertation investigated potential associations between parent eating behaviors and the outcomes of adolescents enrolled in a pediatric weight loss trial (TEENS+; PI: Bean, R21HD084930). The TEENS+ intervention offered a comprehensive behavioral weight intervention for parent-adolescent dyads. Given the well-established importance of parents in the development of an adolescent’s health behavior, this …

Continuous Flow As A Process Intensification Tool For The Preparation Of Pharmaceutically Relevant N-Heterocycles, John W. Tomlin Jr

Theses and Dissertations

Continuous flow as a process intensification tool for the preparation of pharmaceutically relevant N-heterocycles

John W. Tomlin

Thesis Defense: 17 January 2024

Committee: B. Frank Gupton, Ph.D. (Advisor), Suzanne M. Ruder, Ph.D. (Chair), Heather R. Lucas, Ph.D., James K. Ferri, Ph.D., Matthew C.T. Hartman, Ph.D.

A dissertation submitted in partial fulfillment of the requirements of Doctor of Philosophy at Virginia Commonwealth University

© 2024 John W. Tomlin Jr All Rights Reserved

Abstract

Essential medicines must be produced in large quantities to accommodate large global demand. The preparation of these active pharmaceutical ingredients (API) must therefore strive to be both cost-effective …

Systemic Contributors To Health Equity: A Conceptual Framework And Moderation Analysis, Rachel Regal

Theses and Dissertations

This dissertation presents a line of research exploring systemic factors that influence health and health equity across the lifespan. A linking document prefaces two-manuscripts as follows. Manuscript 1, A Model for Enhanced Trauma-Informed Care: An Asset-Based, Transdisciplinary Approach to Health Equity, presents a synthesis of literature on multisystem resilience, social determinants of health, and adverse / positive childhood experiences to build an alternative framework to promote healing and health equity using an asset-based approach within enhanced trauma-informed systems of care and educational models. By adopting this enhanced framework, the counseling field and others can be responsive to emerging trends and …

The Genetic Architecture Of Cervical Change During Pregnancy: From Modeling To Mechanism — Does The Cervix Mediate Maternal Risk For Spontaneous Preterm Birth?, Hope M. Wolf

Theses and Dissertations

This project leverages clinical data and biospecimens from a prospective longitudinal cohort of pregnant women to study the genetic and phenotypic relationships between cervical shortening and the duration of pregnancy. Sonographic cervical length (CL) was measured throughout pregnancy in a cohort of 5,160 Black/African American women in Detroit, Michigan. Maternal DNA samples were sequenced with a next-generation low-pass whole genome platform. The heritability of cervical change during pregnancy and its genetic correlation with gestational age at delivery (GAD) were estimated using Genome-Wide Complex Trait Analysis. These estimates suggest that cervical change is heritable (h²CL = 51%) and highly polygenic trait. …

Towards The Automation Of Post-Processing Of Additive Manufacturing Using Collaborative Robots, Logan Schorr

Theses and Dissertations

Despite the incredible potential that collaborative robots have, they are underutilized in several industries that could benefit greatly. These specialized fields, such as additive manufacturing, face challenges that can be solved with the use of robotics, including advanced computer vision, end-effector tooling, and process refinement. My research aims to utilize collaborative robots in an effort to solve the above stated problems, for the specific fields of additive manufacturing. Specifically within this field is the automation of post-processing; this is normally completely manual, as the tools for automation are not sufficiently developed to handle the flexibility required for additive manufacturing. This …

Development And Evaluation Of Reactor Physics Transient Benchmarks For Molten Salt Reactors Based On The Molten Salt Reactor Experiment, Mohamed H. Elhareef

Theses and Dissertations

Molten salt reactors (MSRs) are a promising class of advanced nuclear reactors selected as

one of the generation IV reactors. This class of reactors employs a unique design, where fissile

material is dissolved in a molten salt mixture, serving as fuel and coolant of the reactor. The design

features high-temperature low-pressure operation and efficient heat transfer capability, which

leads to significant improvements in reactor thermal efficiency, safety, and waste management.

However, MSRs also have complex phenomena not observed in conventional reactors, such as

fission product transport in the circulating fuel loop. These phenomena impact neutron distribution

and reactivity feedback mechanisms …

Confessions Of A Bomb Tech, Harry Mayer

Mighty Pen Project Anthology & Archive

An EOD technician, or bomb tech, recounts a render safe procedure conducted on a rainy December day. A study on luck, defusing bombs, and the many EOD protocols written in blood.

Articles, stories, and other compositions in this archive were written by participants in the Mighty Pen Project. The program, developed by author David L. Robbins, and in partnership with Virginia Commonwealth University and the Virginia War Memorial in Richmond, Virginia, offers veterans and their family members a customized twelve-week writing class, free of charge. The program encourages, supports, and assists participants in sharing their stories and experiences of military …

A Day In The Life Of A Beanhead, Patrick Potter

Mighty Pen Project Anthology & Archive

It's a beautiful spring morning at West Point Academy, and Cadet Potter is barefoot, late, and an easy target.

For freshman, or Beanheads, just trying to get by at West Point, life is tough. This short humorous memoir recounts a harrowing school day of one such cadet.

Articles, stories, and other compositions in this archive were written by participants in the Mighty Pen Project. The program, developed by author David L. Robbins, and in partnership with Virginia Commonwealth University and the Virginia War Memorial in Richmond, Virginia, offers veterans and their family members a customized twelve-week writing class, free of …

The Emerald Knights, Harry Mayer

Mighty Pen Project Anthology & Archive

A Marine is transferred to the Navy, and is forced to adapt to a drastically different set of rules and attitudes.

Articles, stories, and other compositions in this archive were written by participants in the Mighty Pen Project. The program, developed by author David L. Robbins, and in partnership with Virginia Commonwealth University and the Virginia War Memorial in Richmond, Virginia, offers veterans and their family members a customized twelve-week writing class, free of charge. The program encourages, supports, and assists participants in sharing their stories and experiences of military experience so both writer and audience may benefit.

Exploring Perceptions Of Advanced Coursework Enrollment Practices: A Multiple Case Study, Tomika Ferguson, David B. Naff, Jenna Lenhardt, Amy E. Jefferson, Isaiah Moore, Andrea Herndon, Richard Ashburn, Jessica Harris, Jenna Conlee, Courtney Forstmann

MERC Publications

This report from the Metropolitan Educational Research Consortium highlights findings from a multiple case study exploring enrollment practices related to advanced coursework matriculation in a suburban middle school and rural high school. In connection with the MERC Equitable Access and Support for Advanced Coursework study, this multiple case study included perspectives from students, parents, and educators as they reflected on the factors that support and inhibit access for advanced courses in their schools.

The Man From Figueras, Chris Burnside

The Man from Figueras

Chris Burnside is an artist/choreographer who was inspired to tell stories on stage after seeing performance artist Spalding Gray at an international theater festival in the early 1980s. After retirement and with the encouragement of a lifelong friend, Mr. Burnside started writing some of those stories down, eventually including others. The stories in The Man from Figueras focus on learning experiences, aha moments, and events that have, over the years, changed his perspective and shaped how he has lived his life. The ninety stories are in chronological order and are grouped by the eight decades of his life.

Burnside attended …

Transgender Perceptions Of Breast Health Care And Utilization Of Preventative Breast Imaging Services, Cherish Parham

Theses and Dissertations

Little information exists on transgender patient perceptions of breast imaging care at mammography facilities. The purpose of this descriptive phenomenological study was to understand the lived experiences of transgender patients at mammography facilities, their knowledge of breast care, and how these experiences have shaped their perceptions of the breast imaging community and attitude toward breast cancer screening. By applying the revised the Gelberg-Andersen Behavioral Model for Vulnerable Populations, this study addressed factors specific to the transgender population that may affect their healthcare utilization and how that impacts health outcomes. Researchers collected data from transgender/non-binary individuals in the Richmond, Virginia region …

Characterizing Probabilities Of Outbreaks Of Dengue In Central Argentina Using A Temperature-Dependent Stochastic Model, Morgan H. Jackson, Elizabet L. Estallo, Cheng Ly, Michael A. Robert

Graduate Research Posters

Dengue virus (DENV) causes over 390 million infections and around 40,000 deaths worldwide each year. DENV is primarily transmitted by the mosquito Aedes aegypti, and both the life cycle of these mosquitoes and dengue transmission are significantly impacted by temperature. In the temperate region of Central Argentina, where dengue outbreaks first began in 2009, outbreaks of dengue can only occur due to new introductions of DENV from other regions. Due to the relationships between temperature and dengue, the risk of outbreak changes throughout the year.

We develop a stochastic model including temperature-dependent mosquito life history traits and transmission-related parameters. …

The Sexually Dimorphic Role Of Connexin 43 In Bone Remodeling And Disuse-Induced Bone Loss, Gabriel A. Hoppock

Theses and Dissertations

Bone loss is frequently experienced by individuals undergoing long-term disuse, such as prolonged bedrest, immobilization due to paralysis or injury, and conditions such as spaceflight. Under normal physiological conditions, bone remodeling is balanced by bone-forming osteoblasts and bone-resorbing osteoclasts, and the activity of osteoblasts and osteoclasts is orchestrated by osteocytes. Osteocytes are the most abundant cell type found in bone and ample evidence suggests they are bone’s main mechanosensory cell type. Therefore, understanding osteocyte biology and responses to mechanical signals, or lack thereof during unloading, may lead to new therapeutic targets to combat bone loss during disuse. Previous data has …