Digital Commons Network^™

Converting Cover Crop Biomass To Biogas And Volatile Fatty Acids, Tuba Yasmin Lubna

Theses and Dissertations

Cover crops are commonly used for their environmental benefits, including improved soil health and reduced soil erosion. However, there is limited use for the aboveground biomass, except for oilseed crops. The objectives of this study were to (1) characterize the selected winter cover crop biomass at three growth stages, (2) evaluate the biogas and volatile fatty acids (VFAs) yield, and (3) examine the concurrent alkali pretreatment and ensiling effects on biogas yield. Wild pennycress, golden pennycress, CoverCress^TM, annual ryegrass, cereal rye, pea, and clover biomass were harvested at three growth stages. Results showed that biogas yield increased with …

The Role Of Ethnic-Racial Centrality On Exposure To Microaggressions And The Mental Health And Academic Success Of Second-Generation Latiné Adolescents, Lisette Munoz

Theses and Dissertations

People holding racially minoritized identities are frequently subjected to racial-ethnic microaggressions, a form of everyday racism and discrimination. Acculturative stress and microaggressions have a direct impact on immigrants' mental health (Gee et al., 2007; Finch & Vega, 2003; Hovey, 2000). The increase in conservative immigration policies has led to increased anti-immigrant sentiments and microaggressions (Sissoko & Nadal, 2021). The impact of microaggressions can detrimentally affect psychological and physiological wellbeing, as well as academic performance and cognitive function (Solórzano & Pérez Huber, 2020). Because of their experiences with discrimination, Latino children may become more aware of biases in their social interactions …

Genetic Relative-Finder Services: A Qualitative Study Of Consumer Experiences, Sarah A. Sciba

Theses and Dissertations

Background: Genetic genealogy is an emergent topic in sociology. To date, over 41 million individuals worldwide have tested with the top four direct-to-consumer genetic testing (DTCGT) companies: AncestryDNA, FamilyTreeDNA, 23andMe, and MyHeritageDNA (Glynn 2022). These tests provide consumers with ethnicity estimates, a list of DNA cousin matches, or both. Despite the popularity of DTCGT, there is a lack of data on consumer experiences with genetic relative-finder services (GRF) in the sociological literature. Methodology: I conducted exploratory, qualitative research in the form of in-depth interviews with eight adult women who have used GRF. I gathered data about their motivations for participation …

Understanding The Influence Of A University-Based Reading And Literacy Center Literacy Tutoring Program On Students’ Literacy Behaviors, Beliefs, And Skills: Stakeholder Perspectives, Wanda D. Turk

Theses and Dissertations

A convergent mixed-methods study designed with a networked systems theory framework investigated the influence of a university-based reading and literacy center literacy tutoring program on students’ literacy behaviors, beliefs, and skills. The study examined stakeholder perspectives of changes in students following their participation in the literacy tutoring program. A convergent mixed-methods design collected and analyzed quantitative and qualitative data separately before merging for interpretation. Quantitative data came from students’ pre-assessment scores and post-assessment scores. The results indicated that students’ scores increased, decreased, or remained the same from pre-assessment to post-assessment. Qualitative data came from tutor interviews and parent surveys. The …

Enacting Change In Student Support Services To Meet The Needs Of Evolving Student Demographics, Justin Schuch

Theses and Dissertations

This qualitative study examined the change management leadership strategies employed by Chief Student Affairs Officers (CSAOs) to address the needs of an increasingly diverse student population at midwestern institutions of higher education. The change management leadership strategies employed by seven CSAOs to address the mismatch between the increasing diversity of college student populations and the institutions’ readiness to meet these students' diverse needs were drawn from using in-depth interviews, review of enrollment data, and institutional planning documents. The three research questions guiding this study yielded four major themes. The first theme is related to how CSAOs identify areas for development …

Strata: Layered Support Through Community, Resources, & Design, Jenna M. Sawyer

Theses and Dissertations

Strata reimagines transitional housing as a layered, responsive ecosystem that supports the holistic well-being of individuals experiencing housing insecurity. Inspired by the vertical structure of a forest canopy, the design integrates biophilic principles, trauma-informed strategies, and sustainable practices to create a dignified, inclusive environment. Located in the historic Sauer’s Factory in Richmond, Virginia, the project leverages adaptive reuse to ground the building in local context while addressing systemic gaps in supportive housing. Public amenities, such as a hygiene center, café, learning spaces, and a free store, encourage community integration and reduce stigma, while flexible private units and calming retreat spaces …

Identification Of Pharmacophore Modifications That Enhance Bmp-Receptor Agonism, An Investigation To Understand The Development Of Potential Therapeutic Interventions, Maleka T. Stewart

Theses and Dissertations

Bone morphogenetic proteins (BMPs) are the largest subfamily of the Transforming Growth Factor (TGF)-ß superfamily. BMPs are renowned for their pivotal role in cellular functions such as cell growth, apoptosis, and differentiation. Yet, BMPs have also been attributed to the maintenance of adult tissue homeostasis. BMPs elicit physiological function at the cell membrane via a heterotetrameric complex composed of two Type I and two Type II serine-threonine kinase BMP receptors. Activation of BMP transmembrane receptors results in activation of either canonical (Smad-dependent) and/or non-canonical (Smad-independent) signaling. Given the physiological importance of this intricate communication between receptor activation and induction of …

The Choice Process Of A Higher Education: Latine College Women And The Effects Of Marianismo, Karina Trujillo

Theses and Dissertations

Latine women have significantly increased their enrollment in higher educational institutions throughout recent years. Castillo and colleagues (2010) developed the Marianismo Belief Scale centered around five pillars: “Family,” “Virtuous and Chaste,” “Subordinate to Others,” “Self-Silencing to Maintain Harmony,” and “Spiritual.” The purpose of this study is to (1) provide insight into how Latine women make the vital decision to attend college and (2) explore how marianismo may limit or act as a protective factor. This study interviewed 12 Latinx college women who shared their experiences on how the role of marianismo impacted their decision regarding their college choice process. Content …

Exploring The Relationship Between Athletic Identity And Academic Resiliency Through A Life Skills Transfer Lens., Lilla Kisvari

Theses and Dissertations

The purpose of this study was to examine and explore the relationship between athletic identity and academic resiliency. This is an exploratory study with three research questions: 1) How do Athletic Identity and Academic Resilience correlate? 2) What are the latent classes that exist between Athletic Identity and Academic Resilience? 3) How do these latent classes differ in terms of their academic and athletic characteristics?

The study utilized secondary data which were collected in 2020 and included a total of 489 participants. The participants completed the Athletic Identity Measurement Scale (AIMS) and the Academic Resiliency Scale (ARS-30). Findings revealed that …

Next-Gen Device For Uniform Cellular Migration Assay Execution, Nicholas M. Bittner

Theses and Dissertations

Cellular migration assays, particularly scratch assays, are pivotal in biomedical research for cell motility, wound healing, and metastasis. However, conventional scratch assays suffer from variability due to operator dependence, non-uniform scratch geometry, and a modified microenvironment that impacts reproducibility. This thesis presents the development and validation of a low-cost, 3D-printed device designed to standardize cellular migration assays. The device utilizes a spring mechanism and a biocompatible elastomer to create a uniform cellular exclusion zone without harming the surrounding cells. Through iterative prototyping and testing with MCF10A cell lines, the device demonstrated a significantly lower average standard deviation of length compared …

Comparative Study Of Robotic And Manual Welding For Energy Consumption And Efficiency In A High Mix, Low Volume Manufacturing Environment, John Ruprecht

Theses and Dissertations

This study examines the comparative efficiency and energy consumption of manual versus robotic welding in high-mix, low-volume (HMLV) manufacturing environments. Traditional robotic welding systems have been predominantly used in low-mix, high-volume production due to their efficiency in repetitive tasks. However, the advent of collaborative robots (cobots) has democratized robotic automation for diverse manufacturing needs. Cobots allow flexibility in programming, enabling their deployment in HMLV environments characterized by hard product variety and smaller batch sizes. This research evaluates energy consumption, welding speed, and quality metrics across manual and cobotic welding systems. Data were gathered using energy meters and video analysis, focusing …

Synthesis And Characterization Of Additive Manufactured Functional Composites For Biomedical Applications, Alexander Thorne

Theses and Dissertations

This dissertation investigates the synthesis and characterization of 3D printed polymer composites, with engineered porosity and both natural and synthetic additives, using fused deposition modeling (FDM) and selective laser sintering (SLS) for potential biomedical applications. The structural, mechanical, tribological, and surface behavior of these composites were evaluated with respect to their suitability for orthopedic load-bearing implants and scaffolds. In the first phase, PEEK-based composites reinforced with 10 or 20 wt% carbon fibers or 20 wt% E-glass fibers were fabricated using FDM with varying infill densities of 30-100% to introduce porosity. Results revealed that loading additives, infill densities, and porosity play …

Leveraging Distributed Semantics From Deep Learning Architectures For Literature-Based Discovery, Clint A. Cuffy

Theses and Dissertations

Literature-based discovery (LBD) is a scientific process that introduces methods to automatically identify novel insights between non-interacting sets of literature. To date, numerous statistical and machine learning-based methods have been applied in the biomedical domain to find treatments for diseases such as Raynaud's disease, Parkinson's disease, and Multiple Sclerosis. However, the lack of standardized practices and creation of bespoke methodologies produces a scenario where the adoption of LBD remains challenging in real-world systems. Our work addresses these concerns through the improvement of five critical areas: 1) error propagation within LBD's a priori dependent tasks, 2) exploring the integration of modern …

Beyond Homogeneity: Exploring Causal Heterogeneity In Psychopathology, Philip B. Vinh

Theses and Dissertations

Traditional models in psychiatric research often impose assumptions of causal homogeneity, treating population-level associations as reflective of uniform underlying mechanisms. This dissertation challenges that assumption by introducing statistical and machine learning frameworks designed to detect and model causal heterogeneity in the development of psychopathology. Central to this approach is the advancement of finite mixture structural equation modeling (FM-SEM) to identify latent subgroups characterized by distinct, and sometimes opposing, causal pathways.

The dissertation comprises three integrated empirical studies. The first introduces mixDoC, a finite mixture extension of the classical Direction of Causation (DoC) model applied to twin data, enabling the detection …

Persistence Of Southwestern White Pine (Pinus Strobiformis) In An Ever-Changing Environment, Shruti Shrivastava

Theses and Dissertations

Abstract

Local adaptation is known to occur in multiple tree species, with climate as a main force for it occurring, indicating adaptation and changes occurring in spatially and temporally changing climates. With increased climate change, the question now is what future persistence may appear as, and by what magnitude trait mismatch may occur. This is observed in southwestern white pine (Pinus strobiformis) for drought-response traits: resistance (RT), recovery (RC), and resilience (RS). Using previously collected data, the genetic and phenotypic diversity were analyzed. Using that information, the trait values for individuals where only genetic data was known was …

Mctr3 Mitigates Cigarette Smoke-Induced Pulmonary Inflammation And Damage, Yu Par Aung Myo

Theses and Dissertations

Smoking is deleterious to our lungs and can precipitate in a multitude of diseases, including chronic obstructive pulmonary disease (COPD). COPD is primarily caused by smoking cigarettes and is a major public health issue. Current therapies only treat symptoms without halting or reversing disease progression, thus highlighting a large unmet need to develop new therapies. We address this gap by investigating maresin conjugate in tissue regeneration 3 (MCTR3) which is a newly discovered specialized pro-resoling mediator (SPM) that has the novel property of promoting tissue repair and regeneration in addition to being anti-inflammatory and pro-resolving. For the first time, we …

Why People Stay: Factors Contributing To Staff Retention In Community Mental Health Clinics, Brianna D. Boggs

Theses and Dissertations

The current behavioral health crisis is exacerbated by a crisis in the behavioral health workforce. Recruiting and retaining workers in behavioral health has become a challenge, making access to services for those needing them even more difficult. This study aimed to examine which factors have the strongest influence on an employee’s work engagement and decision to remain employed at their current organization. This study used Aarons et al.’s multilevel, multiphase implementation model (2011), with a focus on inner contextual factors as a means to help inform potential interventions to address the factors and improve retention. This study also applied the …

The Role Of Context Sensitivity On The Association Between Racial Discrimination And Emotional Dysfunction Among Black American Adolescents, Summer C. Bryant

Theses and Dissertations

Black adolescents are at an increased risk of experiencing racial discrimination due to a developmental period marked by increased time away from parents and caregivers and increased time with peers (Fisher et al., 2000). Empirical research has shown that Black adolescents’ experiences of racial discrimination are associated with emotion dysfunction (Benner et al., 2018; Seaton et al., 2009; Sellers et al., 2006). Although previous research has identified racial factors such as racial socialization and racial identity as protective factors by reducing the impact of racial discrimination on Black adolescents’ emotion dysfunction (Gibson et al., 2021; Neblett et al., 2008), we …

Modeling The Impacts Of The Current And Projected Temperatures On Spongy Moth Population Dynamics, Adrienne B. Spring

Theses and Dissertations

The spongy moth (Lymantria dispar) is an invasive forest pest that has caused significant ecological damage across the United States. Its invasion front is shaped by a number of factors, including temperature in both the northern and southern regions. With ongoing climate change, areas that were previously uninhabitable may become increasingly favorable for moth population establishment and expansion, while other areas may experience thermal stress limiting persistence. This study develops a temperature-driven population model to analyze how temperature affects the spongy moth population dynamics along the invasion front. This model incorporates temperature effects on fecundity, stage-specific survival rates, …

Tate Speech: Radicalizing Rhetoric And Multi-Level Marketing Recruitment Strategies In The Manosphere, Carey J. Priebe

Theses and Dissertations

My study aims to uncover the discursive elements behind the gendered recruitment strategies that influencers in the manosphere use to pipeline men and boys into their multi-level marketing (MLM) companies. In the manosphere, male supremacy is presented as desirable and subversive, and MLMs take advantage of emotional and economic instability. My study examines the Twitter (X) account of the popular manosphere influencer Andrew Tate as I trace his rhetoric along a three-pronged gendered recruitment framework, a framework originally developed around women selling essential oils online and funneling their followers into radical alt-right politics. What are the similarities and differences in …

Functional Analysis Of Ligand Binding Domain 2 Of Outer Surface Protein C Of Borreliella Burgdorferi, Gavin Z. Chambers

Theses and Dissertations

Lyme disease, caused by the spirochete Borreliella burgdorferi, is the most common vector-borne infection in North America. A critical determinant of early mammalian infection is outer surface protein C (OspC), a highly variable lipoprotein that is indispensable for spirochete survival but whose precise function remains unresolved. OspC has been proposed to mediate diverse roles, including complement evasion, adhesion, tissue dissemination, and antiphagocytic activity, supporting the view that it is a multifunctional virulence factor. Structural studies have identified two putative ligand-binding domains (LBD1 and LBD2), with LBD2 forming a solvent-exposed crown at the membrane-distal end of the OspC dimer.

To …

Women Of Color In K-12 Educational Leadership Pursuing Higher-Level District Advancement In Public Education, Telicia R. Leonard

Theses and Dissertations

This paper focuses on the inequities in leadership along with gender and racial intersections that may contribute to barriers for Women of Color who have already acquired mid-level leadership positions and are seeking opportunities to acquire positions deemed as senior district-level positions. This qualitative case study was explored through the lens of feminist poststructuralist and equity theories. The objective was to research the participants and ascertain participant perspectives on the role that race, and gender constructs have played in their ability to attain their current positions and how any barriers encountered impact their attempts at new levels of career advancement …

Perinatal Policy Disparities And Their Impact On Maternal, Paternal, And Child Health, D'Ashanae Y. Pippens

Theses and Dissertations

This systematic review synthesized evidence on perinatal policy framework to evaluate their public health significance and impact on family outcomes. Following Preferred Reporting Items for Systematic Reviews Meta-Analyses (PRISMA) methodology, peer-reviewed literature, policy documents, and corporate data from 2015-2025 were reviewed across national, state, and global levels. The analysis revealed seven thematic domains, (1) policy design and duration, (2) wage replacement, (3) insurance continuity, (4) workplace breastfeeding accommodations, (5) parental leave, (6) equity in access, and (7) policy enforcement. Evidence shows that integrated and inclusive policies particularly those in Sweden, Germany, and progressive U.S. states (NY and CA), yield substantial …

Assessing Electronic Nicotine Delivery System Abuse Liability Among People Who Smoke Cigarettes: Impact Of Device Characteristics, Nicotine Flux, And Flavor, Elizabeth Oluwapelumi Ogunleye

Theses and Dissertations

This clinical laboratory study utilizes subjective and behavioral economic measures to assess the abuse liability of own-brand cigarettes and six currently authorized ENDS products, examining how device characteristics, nicotine flux, and liquid flavor influence outcomes among adults who smoke cigarettes. Using a Latin-square-ordered, within-subject design, adults who smoke cigarettes (N = 30; N = 20 preferred menthol cigarettes) attended four clinical sessions: one to evaluate their own-brand cigarette and three to assess six NJOY ENDS products: 2.4% nicotine pods (~58 µg/s; tobacco and menthol flavor), 6% nicotine disposable products (~61-65 µg/s; tobacco and menthol flavor), and 5% nicotine pods (~118-123 …

Examining Multiple Stakeholder Perspectives On The Acceptability Of Pain-Mitigation As A Tool To Manage Needle Fear, Sarah C M Morton

Theses and Dissertations

Needle fear affects up to 63% of the global adult population and is associated with significant fear-based medical care avoidance (e.g., blood donation refusal, vaccine hesitancy, insulin injection adherence). Current behavioral treatments have low acceptance in this population, and often fail to address the experience of pain associated with needle procedures. Despite the existence of evidence-based pain-mitigation for needle procedures, these interventions are not commonly used in clinical settings. The current study used qualitative methods to examine patient and provider perceptions of: 1) current methods of needle fear management, and 2) the acceptability of pain-mitigation as an effective tool to …

Lived Experiences Of School Counselors’ Facilitation Of Small Group Counseling In Public High Schools, Joshua D. Hurley

Theses and Dissertations

The purpose of this phenomenological qualitative study was to explore the lived experiences of school counselors’ facilitation of small group counseling in public high schools. Prior research has shown that high school counselors utilize small group counseling at a lower rate than their elementary school counterparts. Researchers have identified two primary barriers that school counselors face in the implementation of small group counseling in schools to include time and internal fear and anxiety. This study investigated the lived experiences of 11 school counselors in their facilitation of small group counseling in the public high school setting. Through data analysis, three …

“You’Re Only As Good As Your Resources”: Exploring Virginia Police Chiefs’ And Sheriffs’ Decisions As Public Administrators To Engage In Community Collaborations With Domestic And Sexual Violence Agencies, Christine E. Wengloski

Theses and Dissertations

The collaborations between domestic and sexual violence victim-serving agencies (DSVAs) and law enforcement agencies help connect victims of crime to needed services. To maximize the benefits of these victim-serving initiatives in Virginia, it is imperative that victim-serving agencies understand the perceptions and factors that influence the decision-making of law enforcement administrators. In this study, I first present a theoretical framework of Herbert Simon’s Decision-Making Theory as a guide to understanding police chiefs and sheriffs as public administrators. A review of the literature demonstrates gaps in existing scholarship around chiefs’ and sheriffs’ decision-making about domestic and sexual violence victim-serving initiatives. Next, …

Acute Effects Of Electronic Nicotine Delivery System Liquid Nicotine Form And Sweetener Among People Who Use Inhaled Tobacco Products, Mary A. Carrico

Theses and Dissertations

Research on tobacco product standards to limit the abuse liability of electronic nicotine delivery systems (ENDS) has primarily focused on nicotine concentration and flavor. Other liquid characteristics, such as protonated nicotine ratio and sweetener additives, are less understood but may serve as regulatory targets. This clinical laboratory study examined the effects of ENDS protonated nicotine ratio and sweetener presence on nicotine delivery, use behavior, and subjective effects.

Thirteen participants completed four sessions that varied by protonated nicotine ratio (0:100 vs. 40:60 freebase to monoprotonated nicotine) and sweetener status (sweetened with 3 mg/mL ethyl maltol vs. unsweetened). Each session included a …

Just Give Me A Reason: Developing A Scale To Explore The Drive For Seeking Provocation, Sydney R. Kavanaugh

Theses and Dissertations

Provocation seeking (PS) is defined as the deliberate choice an individual makes to enter into a situation wherein other people are likely to provoke (e.g., threaten, insult) them towards some type of dispute. Rooted in the broader framework of situation selection, which describes how individuals choose environments that align with their goals and emotional states, PS specifically captures the tendency to seek out contexts likely for conflict. The present studies represent an initial step in investigating the novel concept of PS by identifying commonly endorsed PS behaviors and developing a measure to assess them. Given the lack of existing research …

Show Them, Teach Them, Let Them: Empowering Undergraduate Voices Through Student-Centered Theatre, Abigail G. Norris

Theses and Dissertations

This thesis explores the urgent need for theatrical works that resonate with undergraduate students, arguing that student-centered playwriting and production can foster deeper engagement with theatre, reflect contemporary issues, and empower the next generation of theatre-makers. Grounded in a hybrid methodology of creative practice and qualitative research, the study proposes a comprehensive, student-driven model for university theatre programs. Drawing from the author's experiences at both the University of North Carolina at Wilmington and Virginia Commonwealth University, the thesis examines institutional season selection processes, inclusive pedagogical strategies in playwriting, and the development of new works through student festivals. Central to the …