Digital Commons Network^™

Hurricane Impacts Compounded By Sea Level Rise: An Illustrative Case Study Of Economic Impacts And Workforce Resilience Analysis, Juita-Elena Yusuf, Yin-Hsuen Chen, Robert M. Mcnab, George M. Mcleod

School of Public Service Faculty Publications

Expected sea level rise will increase the probability of extreme flooding events, such as those associated with hurricane surge and/or heavy rainfall. Projecting the economic impacts of a significant hurricane is necessary for weighing the costs and benefits of potential mitigation actions. Accounting for the compounding effects of sea level rise is critical, given the challenges elevated sea levels pose to coastal communities in the U.S. and worldwide. This chapter asks: How can we comprehensively estimate the economic impacts of a hurricane event that is compounded by sea level rise? To address this, we offer a methodology for conducting an …

Loralee Clark, Loralee Clark, Loralee Clark

Virginia Poets Database: A Literary and Educational Resource

No abstract provided.

Simulations Of Inverse Compton Scattering With Radiation Reaction, Elizabeth Breen-Lee

Physics Theses & Dissertations

Inverse Compton scattering (ICS) is a versatile mechanism for producing bright, tunable, and quasi-monochromatic x-ray and gamma-ray radiation through the interaction of relativistic electrons with intense laser pulses. These sources have applications spanning medicine, archaeological studies, materials science, and fundamental research, motivating continued efforts to improve both their performance and the accuracy of theoretical models used to describe them. As nextgeneration laser and accelerator facilities continue to reach increasingly intense regimes, efficient and accurate simulation techniques have become essential for the design and optimization of ICS sources. This dissertation presents the development of analytical and computational methods for modeling inverse …

Parameter Dependent Chen-Fliess Series And Their Nonrecursive Interconnections, Natalie T. Pham

Electrical & Computer Engineering Theses & Dissertations

In control theory, a Chen-Fliess functional series is a weighted sum of iterated integrals constructed from a given set of input functions. Such series can be used to represent nonlinear input-output systems. In applications, they have been employed to characterize interconnected nonlinear systems, to solve system inversion and tracking problems, and to design predictive and adaptive controllers.

Distributed parameter systems exhibit spatial dependence along with temporal dependence. Such systems are typically represented in terms of partial differential equations. In control theory, there appears to be no existing method for representing the input-output map of a distributed system via a Chen-Fliess …

Effects Of Beverage Color During Mouth Rinsing On Measures Of Muscular Endurance, Muscular Strength, And Exercise Perceptions During Isometric Handgrip Testing, Sydney Andrews

Exercise Science Theses & Dissertations

Previous research has shown that color can influence psychological responses, physiological responses, and exercise performance. These effects have been previously attributed to learned associations or expectations which may influence exercise-related outcomes. This study aimed to investigate whether beverage color influences muscular performance during intermittent isometric handgrip exercise. This randomized, single-blind, deceptive crossover study consisted of 34 physically active adults (21.9±3.1 years) who completed a handgrip endurance test under three conditions: red beverage rinse, clear beverage rinse, and no-rinse. Participants were informed that the study would examine the effects of mouth rinsing two commercially available carbohydrate containing sport drinks on muscular …

Long-Term Spatiotemporal Change In Coral Reef Fish Populations And Communities In The Philippines, John Christopher Whalen

Biological Sciences Theses & Dissertations

The Visayas Region of the Philippines is a global epicenter of marine fish biodiversity. Hypotheses attribute this peak of species richness within the Coral Triangle to processes that occur at geological time scales. However, changes in biodiversity may occur on ecological time scales, allowing for the assessment of the potential impact of anthropogenic activities. Recent declines in genetic, species, and ecosystem diversity have been observed in the tropics, including the Philippines. Within the Philippines the Visayas Region is considered the epicenter of species adversity due to anthropogenic stressors such as habitat degradation, overfishing, and harvesting individuals for the aquarium trade. …

Analyzing The Institutional Factors Associated With Sense Of Belonging Among Stem Adjuncts At Community Colleges, Karuna Taneja

Educational Leadership & Workforce Development Theses & Dissertations

In this study I examined the relationships among organizational support, workplace conditions, and sense of belonging among adjunct faculty teaching STEM courses in community colleges. Grounded in the need-to-belong theory (Baumeister & Leary, 1995) and Herzberg’s two-factor theory (1968), I distinguished between relational and structural dimensions of faculty experiences. Perceived organizational support was conceptualized as a relational construct reflecting faculty members’ perceptions of being valued and included within their institutions, whereas workplace conditions were examined as structural factors influencing job satisfaction.

Using a quantitative, cross-sectional correlational survey design, data were collected from adjunct STEM faculty (N = 64) teaching at …

Lgbtq People's Lives Post-Incarceration: A Multi-Method Study, Hayley Jackey

Sociology & Criminal Justice Theses & Dissertations

LGBTQ people are disproportionately targeted by the criminal legal system and overrepresented in the carceral system. Despite current research in queer criminology examining the impacts of the carceral system on the community, there is a dearth of literature examining LGBTQ people’s experiences or identity disclosure once released from the Prison Industrial Complex and into the Prisoner Reentry Industry. Using unique methodologies of photo-elicitation interviews and in-depth interviews, the current study examines how ten formerly incarcerated LGBTQ people navigate returning to society post-incarceration. The study found two distinct experiences. The first group was selective about who they shared their LGBTQ identity …

Enhancing Stem Education With Modeling, Simulation, And Ai Technologies: From Virtual Laboratories To Intelligent Teaching Assistants, Yiyang Li

Electrical & Computer Engineering Theses & Dissertations

Rapid advancements in modeling and simulation (M&S) and artificial intelligence (AI) present new opportunities to enhance various aspects of STEM education, from virtual laboratories that simulate physical lab environments in software to intelligent teaching assistants that provide on-demand, curriculum-aligned instructional support. Virtual laboratories offer a potential solution to the access and scalability challenges of laboratory courses by allowing students to conduct experiments without physical equipment or geographical constraints. AI-powered teaching assistants, particularly those grounded in course-specific materials, can help mitigate the instructional support gap that arises when students work independently in digital learning environments. This dissertation presents three-phase research into …

Switches And Witches: Exploring The Relationships Between Religious Struggles, Spiritual Beliefs, And Well-Being, Emma J. Trierweiler

Psychology Theses & Dissertations

This study examined the mechanisms between interpersonal and doubt-related struggles and well-being outcomes in a formerly religious sample. The focus of this dissertation was to analyze the mediating roles of disengagement from God and perceived social support. Approach toward God was also examined as a control but not specified to be connected to the well-being outcomes given the emphasis on formerly religious individuals’ experiences. This was a retrospective study, where participants were asked to consider their responses as they relate to the time they were pulling away from religion. Three measures of well-being were explored using structural equation modeling. Positive …

A Causal Inference Protocol For Root-Cause Diagnosis In Non-Stationary Industrial Time Series, Cansu Yalim

Engineering Management & Systems Engineering Theses & Dissertations

Industrial fault diagnosis increasingly relies on data-driven methods, yet most approaches assume process stationarity and treat association-based rankings as sufficient evidence for root-cause identification. Neither assumption holds when operating phases and fault progression create distinct behavioral regimes with shifting relationships among variables, and neither answers which feasible corrective action would alter a fault trajectory. The absence of a procedure addressing non-stationarity, causal identifiability, and decision-relevant effect estimation constitutes the gap this dissertation targets. In this context, a regime is a time period in which the process operates under a relatively consistent setting, so the relationships among variables are approximately stable …

Physics-Guided Deep Learning For Predictive Modeling Of Spatiotemporal Dynamical Systems, Niharika Deshpande

Engineering Management & Systems Engineering Theses & Dissertations

Many physical and networked systems evolve under continuously changing spatial and temporal conditions. Transportation networks respond to fluctuating demand, atmospheric fields reorganize as storms intensify, and coastal response depends on localized forcing pathways. Modeling such systems requires learning formulations that adapt to evolving structure, operate on irregular geometries, and provide interpretable measures of predictive uncertainty. This dissertation develops a physics-guided spatiotemporal learning framework designed for structured dynamical systems whose governing interactions are neither static nor Euclidean. The central premise is that spatial relationships in these systems are dynamic and geometry-dependent. To represent this behavior, system states are modeled on time-varying …

Retention During Turbulent Times Of Higher Education: Modeling Intent To Leave Academia For Research University Faculty, Jordan Monroe Ball

Psychology Theses & Dissertations

University faculty operate as the lifeblood of any institution given that their job requires a “double duty” to develop both scholarly research and student minds. Due in large part to these expectations, research shows a long history of poor mental health for faculty, which ultimately results in faculty turnover. One model of faculty work motivation (Padilla et al., 2023) details the way in which the faculty work environment influences their mental health, and subsequently informs their job satisfaction, organizational commitment, and intent to leave academia, which serves as a proxy for turnover. Retention related issues have not been a pressing …

Quantitative Surface-Enhanced Raman Spectroscopy For Antiretroviral Drug Monitoring: Novel Quality Index And Distributional Approaches In Aqueous And Plasma Matrices, Marguerite Rose Butler

Chemistry & Biochemistry Theses & Dissertations

Surface-enhanced Raman spectroscopy (SERS) offers high sensitivity for molecular detection but is limited for quantitative applications by spatial heterogeneity in signal enhancement on dried colloidal substrates. This Dissertation addresses these limitations through the development and evaluation of novel quantitative methods applied to the antiretroviral drugs tenofovir and emtricitabine.

A quality index (Qi) metric was developed to rank individual SERS spectra within each well based on analyte peak prominence relative to local baseline. SERS spectra were acquired from evaporated silver colloid deposits on aluminum well plates using a custom raster-scanning Raman system. Calibration curves were constructed using the top-ranked spectra (Top-Qi …

Motivation And Constraints In Recreation Participation Among Children And Adults With Disabilities, Monica Klock

Human Movement Studies & Special Education Theses & Dissertations

This dissertation investigated how motivation and constraints relate to participation in outdoor and community recreation among children with disabilities and adults who are blind or visually impaired. Although outdoor recreation is associated with important physical, psychological, and social benefits, people with disabilities continue to participate at lower rates than their peers without disabilities, and prior work shows that barriers extend well beyond physical access to include structural, interpersonal, and intrapersonal constraints. Drawing on the Constraint–Negotiation Model (CNM) and social cognitive theory, this dissertation addressed gaps in multivariate research and life-course perspectives by examining whether and how motivations, perceived constraints, and …

Variability In Nutrient And Enterococcus Concentrations In Tidal Floodwater Across Watersheds With Different Land Uses, Alyssa Bucci

OES Theses and Dissertations

Tidal flooding is an increasingly pressing hazard in coastal Virginia due to sea level rise and land subsidence. The Hampton Roads region of Virginia has the second-highest rate of relative sea level rise in the United States and experiences frequent tidal flooding, but the water quality impacts of this flooding on the Chesapeake Bay are not being accounted for. High concentrations of dissolved nutrients and Enterococcus bacteria (a fecal indicator) have been observed in tidal floodwater of the Lafayette River, a tributary of the James River and the lower Chesapeake Bay. This study investigates variability in dissolved nutrient and Enterococcus …

Residual Stress Informed Reconstruction And Failure Analysis Of Manufacturing Induced Composite Meso-Structure, Mohammad Nazmus Saquib

Mechanical & Aerospace Engineering Theses & Dissertations

A physics informed, AI-augmented framework is developed to enable digital twins of molded composite materials by linking manufacturing induced residual stresses to a local meso-structure. By reconstructing and explicitly modeling these architectures, the framework reveals how processing driven meso-structural variability governs stiffness, damage evolution, and failure. The work focuses on two technologically important systems: prepreg platelet molded composites (PPMC), characterized by inherently stochastic platelet architectures, and 2/2 twill glass fiber/PA6 organosheets, whose periodic but locally variable weave geometry influences mechanical response. For PPMC, the Residual Stress Informed Microstructure Reconstruction (ResIMiR) framework is introduced, combining thermoelastic strain fields with deep learning …

Computational And Ai Tools For Understanding Telomere-Associated Cancer Mechanisms, Eleni Adam

Computer Science Theses & Dissertations

Telomeres are the protective caps of the human chromosomes and are critical for genome stability. Dysfunctional telomeres caused by their erosion with age and cell proliferation as well as by defects in their maintenance is a major early event leading to genome changes and cancer. Subtelomeres possess the critical role of regulating adjacent telomeres. Due to their complex repeat structure and high variance from one person to another, these areas have not been analyzed in detail. We present a set of computational and machine learning tools to aid in the understanding of subtelomere structure and its rearrangements in cancer.

Initially, …

Glioma Segmentation In Mri Using A 3d Hybrid U-Net With Adaptive Self-Attention And Multi-Modal Fusion, Evan P. Savaria

Computer Science Theses & Dissertations

Accurate glioma segmentation from multi-modal Magnetic Resonance Imaging (MRI) is essential for diagnosis, treatment planning, surgical guidance, radiation targeting, and longitudinal monitoring. MRI modalities such as T1, T1Gd, T2, and FLAIR provide complementary information for identifying clinically important tumor sub-regions, including enhancing tumor (ET), tumor core (TC), and whole tumor (WT). However, many existing segmentation methods do not fully preserve modality-specific information, process all modalities and slices uniformly, and often rely on a single shared fusion strategy for all sub-regions. These limitations can reduce segmentation accuracy, increase computational cost, and limit clinical interpretability.

This dissertation addresses these challenges through three …

The Role Of Phenotypic Plasticity And Bet-Hedging In Coping With Unpredictable Temperature Fluctuations In The Marine Annelid Ophryotrocha Labronica, Gabrielle Dawn Newton

Biological Sciences Theses & Dissertations

Coastal ecosystems are increasingly exposed to unpredictable temperature fluctuations, potentially favoring strategies that buffer populations against environmental uncertainty. This study examines how phenotypic plasticity and diversified bet-hedging contribute to variation in life-history traits under differing thermal predictability in the marine annelid Ophryotrocha labronica. After three generations at 24 °C, broods were reared for three generations under four thermal regimes: constant 24 °C (C24), constant 27 °C (C27), predictable fluctuations (Fp), and unpredictable fluctuations (Fu). Survival was assessed before and after acclimation to evaluate selective pressure among regimes. Age at maturity, fecundity, and growth rate were used to quantify plasticity (trait …

The Effects Of Working With Unidentified Migrant Remains: Caregiving, Border Security, And Human Rights On The U.S.–Mexico Border, Jennifer Delaine Huddleston

Graduate Program in International Studies Theses & Dissertations

This dissertation explores how migrant death and the handling of unidentified remains operate within U.S. border governance, focusing on caregivers, forensic anthropologists, and volunteer search-and-recovery teams who recover, document, and try to identify the dead along the U.S.–Mexico border. Using classic grounded theory and reflexive visual ethnography, the study includes interviews, field observations, and documentary photography conducted in South Texas, covering Brooks, Maverick, and Webb Counties.

Instead of viewing migrant deaths as accidental humanitarian tragedies, this dissertation situates caregivers’ daily work within a historical trajectory of deterrence-based border policies, from Prevention Through Deterrence to modern state-led enforcement regimes. It demonstrates …

Menopausal Symptoms, Psychosocial Factors, And Physical Activity Among Physically Active Midlife Females, Ella Onsoriasl

Exercise Science Theses & Dissertations

Menopausal symptoms are common during midlife and may be associated with females' physical activity (PA) participation, yet how these symptoms relate to PA levels, perceived confidence and enjoyment, and psychosocial resources such as social support (SS), exercise identity, and quality of life (QOL) remains unclear. The purpose of this study was to examine how menopausal symptom severity relates to PA levels, perceived confidence and enjoyment during PA, and psychosocial factors, including SS, exercise identity, and QOL. This cross-sectional study surveyed 151 midlife females aged 40 to 60 who reported engaging in intentional PA at least once per week. Participants completed …

The Mediating Role Of Hope In The Relationship Between Everyday Discrimination And Depression Among College Students, Busra Vurkun

Counseling & Human Services Theses & Dissertations

Research shows that marginalized populations experience disproportionately higher psychological distress (Budhwani et al., 2015; Bailey et al., 2019). Everyday discrimination, defined as chronic interpersonal mistreatment such as microaggressions and disrespect, is associated with greater depression and lower psychological well-being (Essed, 1991; Calabrese et al., 2015). Although the negative effects of discrimination are well established, less is known about protective factors that may reduce these outcomes. One such factor is hope, conceptualized by Snyder et al. (1991) as agency thinking and pathways thinking and linked to lower depression and greater resilience (Arnau et al., 2007; Banks et al., 2008). This study …

Autistic Students' Experiences With Hybrid Flexible Instruction In Higher Education: An Interpretive Phenomenological Study, Tracey Nicole Barr

STEMPS Theses & Dissertations

During the twenty-first century, autistic learners have enrolled in colleges and universities in greater numbers; however, the majority of research focused on their experiences in higher education has found them to be less academically successful than their neurotypical peers. The academic skills that autistic students bring to higher education are often tempered by social, emotional, and self-regulative challenges. The body of research focusing on autistic learners’ experiences in higher education is currently limited and focused primarily on fully in-person and online course models. No extant research has focused on autistic students’ experiences with hybrid or blended course models.

This interpretive …

Modeling And Generating Crash Avoidance Behaviors In Safety-Critical Vehicle–Pedestrian Interactions Using Deep Reinforcement Learning, Qingwen Pu

Civil & Environmental Engineering Theses & Dissertations

Traffic crashes between vehicles and pedestrians arise from complex, split-second interactions in which both parties make rapid evasive decisions. Four fundamental gaps persist in existing research. Surrogate safety measures assume linear trajectories, failing to capture the curved movements of turning vehicles and crossing pedestrians at intersections. Single-agent modeling treats one party as a fixed obstacle, ignoring the joint decision-making that governs near-miss outcomes. The effect of vehicle type on pedestrian avoidance behavior—whether pedestrians respond differently to automated vehicles (AVs) than to human-driven vehicles (HDVs)—remains poorly understood. Finally, automated driving system development is hampered by a severe scarcity of large-scale, behaviorally …

De Facto Captivity In The Land Of The Free: Exploring The Confining Effects Of Network And System Avoidance, Brianna Ovalle

Sociology & Criminal Justice Theses & Dissertations

Encroaching state surveillance has primarily targeted people of color living in urban, inner cities, resulting in both much higher likelihoods of encountering state agents and the consequences of such contact. The ceaseless surveillance has led some individuals to engage in protective behaviors aimed at minimizing encounters with agents of the CLS. These behaviors are adaptable to present risks of surveillance and contact with the system. While there are various types of avoidance, the focus of this research is system avoidance and network avoidance. Previous literature for both types of avoidance focuses on the experiences of lower SES men. Further, as …

Time-Frequency Analysis Of Arterial Pulse Signals Of Cardiovascular Disease Patients Measured By A Microfluidic-Based Tactile Sensor, Md Mahfuzur Rahman

Mechanical & Aerospace Engineering Theses & Dissertations

This dissertation presents a single-degree-of-freedom (SDOF) based time–frequency analysis framework that can simultaneously extract a comprehensive set of cardiovascular autonomic indices from arterial pulse wave recordings obtained at rest and post-exercise, supporting non-invasive monitoring of autonomic recovery during cardiac rehabilitation. The framework rests on three technical contributions.

First, an SDOF analytical model of motion artefacts quantifies two physically distinct distortion mechanisms: additive baseline drift and Time-Varying System Parameter (TVSP) generated distortion of the Tissue-Contact-Sensor (TCS) stack. Baseline drift is slowly varying and removable by filtering; TVSP distortion rides on all harmonics of the true pulse signal and cannot be removed …

Deep Multimodal Sensor Fusion For Autonomous Driving: A Real-World Deployment On Little Blue, Raphael T. Pamie-George

Electrical & Computer Engineering Theses & Dissertations

Accurate perception and control systems are essential for autonomous vehicles to safely interpret and navigate complex environments. Individual sensing modalities such as cameras, LiDAR, and inertial measurement units (IMUs) provide valuable environmental and vehicle state information; however, each sensor exhibits inherent limitations when used independently. Camera performance can degrade under varying lighting conditions, LiDAR measurements may be sparse or affected by environmental noise, and IMU measurements are susceptible to drift over time. Little Blue, a research autonomous vehicle platform from ODU (Old Dominion University), previously relied primarily on camera-based data for neural network training, limiting the system’s ability to exploit …

A Longitudinal Analysis Of Hospital Consumer Evaluation In Virginia, Tulay Akmandor Inac

Health Services Research Dissertations

Suboptimal patient experience signals a need to improve clinical efficacy, patient safety, and healthcare quality. The COVID-19 pandemic intensified hospital resource and staffing demands, reducing hospitals’ capacity to invest in patient experience improvement. Prior studies remain limited because many lack longitudinal structure and organized theoretical models, making temporal inference difficult and weakening analyses of patient experience disparities. To address these limitations, this dissertation incorporates three studies examining patient experience and pandemic-related effects.

In state-level markets comparable to Virginia, limited research has examined longitudinal patient experience trends across regional hospital systems using HCAHPS scores. The first study uses descriptive trend analysis …

A Qualitative Case Study Of Leadership Development In A Graduate Medical Laboratory Science Program, Demetra Castillo

EVMS School of Health Professions Theses & Dissertations

Leadership development is increasingly recognized as an essential component of healthcare education, particularly as medical laboratory professionals assume expanded responsibilities involving collaboration, decision-making, systems thinking, and organizational leadership. Despite this need, limited research has explored how leadership develops within graduate medical laboratory science (MLS) programs. This qualitative case study examined leadership development through the lens of Experiential Learning Theory (ELT). Two research questions explored how the program fostered leadership development through students’ professional biographies, leadership questionnaires, final reflection papers, and leadership credos and how leadership reflections demonstrated growth over time. Secondary data from five student cases were analyzed using deductive …