Digital Commons Network^™

Pulsed Electric Fields Sensitize Methicillin-Resistant Staphylococcus Aureus To Antibacterial Therapies And Stimulate Host Immune Responses, Alexandra E. Chittams-Miles

Biomedical Sciences Theses & Dissertations

This research explores the impact of nanosecond pulsed electric fields (nsPEF) on two fronts: their immune stimulatory effects and their potential as a novel strategy to enhance the sensitivity of Methicillin-resistant Staphylococcus aureus (MRSA) to clinically relevant antibiotics. While pulsed electric fields have been reported to have an immune stimulatory effect, the mechanisms responsible for these effects have yet to be determined.

Our investigation addresses the rising concern of MRSA derived skin and soft tissue infections (SSTIs). Consistent with other publications, we found that nsPEF alone cause modest inactivation of planktonic MRSA. We then investigated the effects of nsPEF in …

Examining The Role Of Access To Capital, Social Capital Networks, And Education In Supporting Black Founders And Investors In Technology-Based Entrepreneurship, Akosua Acheamponmaa

Engineering Management & Systems Engineering Theses & Dissertations

In recent years, a report from the Kauffman Index of Startup Activity shows that 540,000 Americans launch businesses each month (Fairlie et al., 2017). However, the number of women-owned and minority-owned businesses in the United States (U.S.) is disproportionately less than the proportion of women and minorities in the U.S. Although women slightly outnumber men in the U.S. (U.S. Census Bureau, 2019), new women-owned businesses represent only 39.4% of all U.S. businesses, while new male-owned businesses represent 60.51% (Fairlie et al., 2017). While Blacks or African Americans comprise approximately 13.4% of the U.S. population (U.S. Census Bureau, 2019), only 9.24% …

Exploring The Experiences Of School Counselors Advocating For Social Justice Within Urban Pk-12 Charter Schools, Betsy Marina Perez

Counseling & Human Services Theses & Dissertations

School counselors serve students’ academic, career, and social/emotional needs through a comprehensive school counseling program, and center their work on concepts of equity, advocacy, social justice, and systemic change, to remove barriers and increase opportunities for all PK-12 students. Charter schools are also unique public school settings as they offer flexibility, innovation, and autonomy to staff to create individualized experiences for their students. Held in common by these two educational services is the commitment to serving the needs of historically marginalized populations (Black, Indigenous, People of Color [BIPOC] and those from low socioeconomic backgrounds) and the opportunity to advocate for …

Application Of The Fokker-Planck Equation For Quantifying Initial Condition Uncertainty Of Reversible Dynamic Systems, Troy S. Newhart

Mechanical & Aerospace Engineering Theses & Dissertations

Characterizing the behavior of dynamic systems requires the inclusion of initial conditions to propagate behavior forward in time. More realistic representations of system behavior quantify uncertainty about the initial conditions to assess sensitivity, reliability, and other stochastic response parameters. In many engineering applications, the uncertain initial conditions may be unknown given a desired response. This research applies the Fokker-Planck equation to reversible dynamic systems of select multi-dimensional nonlinear differential equations as a means for predicting the uncertainty about initial conditions. An alternating directions implicit numerical scheme is used to numerically solve the Fokker-Planck equation for both forward and reversed equations …

Physical Educators’ Self-Efficacy To Teach Students With Disabilities Across Instructional Placements, Lindsey Ann Nowland

Human Movement Sciences & Special Education Theses & Dissertations

Although there are several well used self-efficacy instruments designed to measure PE teachers’ self-efficacy to teach students with disabilities, limitations to these scales exits, such as a narrow focus on integrated instructional placements and an absence of theoretically relevant sources of self-efficacy information built within the scales. These limitations translate to a significant gap in the literature between measuring PE teachers’ self-efficacy and understanding how sources of self-efficacy information interact to shape PE teachers’ self-efficacy beliefs, as well as understanding how different instructional placements may inform efficacy. This dissertation was structured in a two-manuscript approach. The purpose of the first …

Appalachia In The Anthropocene: An Approach To Understanding Neo Appalachian Narratives As An Affective Ecology, Rachel Michel Bates

English Theses & Dissertations

Appalachia is all too often a commodified and mythologized place in the American consciousness. Yet the lived experience of Appalachia is one complicated by widescale ecological devastation, high poverty rates, and most recently, a devastating opioid crisis. Though much of Appalachian literature continues to dwell in an old vision of Appalachia, an endeavor Zackary Vernon terms post-Appalachian, I argue that a subset of texts published around the turn of the millennium, a time when many of the labor-dependent, exploitative industries such as logging, hydro damming, and coal mining were no longer at work in the region, reveal a shift in …

Co-Constructing Physical Education Resources And Recommendations With Blind Adults, M. Ally Keene

Human Movement Sciences & Special Education Theses & Dissertations

Blind youth have reported unfavorable PE experiences, however, are optimistic that positive changes could be made. Despite recommendations to involve students in learning decisions, those made for teaching blind youth in PE have largely been constructed from nondisabled adults. This dissertation used a participatory research method and positioned blind people as research partners, amplifying their voices as knowers, collaborators, and researchers, to help construct resources and recommendations to disseminate to PE teachers. With that, the overall aim of this dissertation was to construct a product that provides PE teachers with useful and relevant resources and recommendations, in an attempt to …

Thermo-Elasto-Plastic Stability Of Biaxially Loaded Hollow Rectangular Section Steel Beam-Columns With Applied Torsion, George Adomako Kumi

Civil & Environmental Engineering Theses & Dissertations

Presented herein is an experimental and theoretical study of biaxially loaded hollow rectangular section steel beam-columns with applied torsion at elevated temperatures. The theoretical analysis is based on a system of simultaneous materially nonlinear differential equations of equilibrium for which an iterative semi-analytic solution approach is formulated. Although the primary goal of this research is to study the influence of elevated temperatures on the steel member with the complex loading, rigorous analysis is also conducted of the member at ambient temperature for comparison. The experimental part of the study involves conducting tests on the members at both ambient and high …

The Volleyball Attack: Training, Kinematics, And The Role Of The Torso, Kiara Baeleah Barrett

Human Movement Sciences & Special Education Theses & Dissertations

Volleyball is an explosive, dynamic sport popular around the globe. The volleyball attack is the predominant point-scoring avenue and the point of interest for many coaches and players. As this motion is repeated many times throughout the course of a match, it is linked to overuse injuries at the shoulder. The purpose of this dissertation is to investigate methodological approaches for research in this movement as well as establishing mechanisms for improving performance and the health of the volleyball players’ shoulder.

For the first study, a systematic review of published literature was performed to ascertain training protocols beneficial to volleyball …

Exploring Cation Exchange: Unveiling Its Significance In Biochar And Bioenergetics Applications, Gyanendra Kharel

Chemistry & Biochemistry Theses & Dissertations

Cation exchange, a cornerstone of soil chemistry and nutrient cycling, is a fundamental chemical process that occurs in soils, sediments, membranes, and other solid materials. It involves the interchange of positively charged ions, or cations, between a solid matrix and a surrounding solution. This process is crucial in various natural and engineered systems, leading to a range of applications across different fields.

This dissertation presents an extensive investigation into the applications of cation exchange in the fields of biochar and bioenergetics, encompassing three distinct aims. The first aim concentrates on the surface oxygenation of biochar through ozonization, aiming to achieve …

3/5ths Of Freedom: The Analysis Of {With} Black Individuals In Higher Education And Navigating Society Post-Justice-Involvement, Gabrielle Sarah Smith Finnie

Educational Leadership & Workforce Development Theses & Dissertations

Black individuals have been disproportionately involved in the criminal justice system in the United States (Federal Bureau of Prisons, 2022). Because of their criminal justice involvement, Black individuals are perceived as second-class citizens making their quest for “freedom” an endless journey impacted by oppression and domination post-justice-involvement (Couloute & Kopf, 2018; Johnson, 2021; Pager, 2003). To combat domination and oppression, Freire (1970) emphasized pursuing higher education helps individuals who experience marginalization become more humanized and aids them on their plight to freedom. Research highlighted pursuing higher education post-justice-involvement is a liberatory yet challenging experience because of discriminatory on-campus …

Effects Of Balance Training On Spinal Reflexive Excitability Modulation, Corticospinal Excitability, And Balance Performance In Individuals With Chronic Ankle Instability, Sunghoon Chung

Rehabilitation Sciences Theses & Dissertations

Chronic ankle instability (CAI) is a neurophysiologic deficit resulting in diverse sensorimotor impairments. Following acute ankle sprains, pain, mechanical instability, and joint deafferentation reduce sensory input to the central nervous system (CNS). In response, the CNS sends altered motor signals to lower extremity muscles. These CNS changes contribute to various neuromuscular impairments in CAI patients, the most common of which is reduced balance performance. Specifically, CAI patients struggle to modulate spinal reflex excitability of the soleus muscle when progressing from simpler to more complex balance tasks. This overreliance on spinal reflexes results in inconsistent activation of the ankle stabilizing muscle. …

Development Of One And Two Current Transition Amplitudes With Two Body Final States, Keegan H. Sherman

Physics Theses & Dissertations

One of the biggest challenges facing modern day nuclear physics is understanding the structure of states within the hadronic spectrum of Quantum Chromodynamics (QCD). We have shown this spectrum to be quite rich with hundreds of allowed states; however, if we wish to better grasp the dynamics of QCD, then it is necessary that we start investigating the internal structure of these states. This may be done by probing these states with external currents, but this requires a description of the intersection of QCD with the electroweak sector. This work acts as a stepping stone in this direction. Working to …

Stakeholders From Multiple Sectors Views And Policy Approaches To Marine Debris Removal: A Qualitative Case Study Of Virginia's Elizabeth River, Robin Rene’ Dunbar

School of Public Service Theses & Dissertations

Marine debris is a wicked problem and there is a call for action for stakeholders from across multiple sectors to address this issue in Virginia. Marine debris can have negative impacts on navigation, aquatic life, recreation, and economies. Research is rapidly growing on ocean debris, but so far, it is limited regarding estuarine river debris in an industrial port and harbor. River systems function as pathways to the sea for the transport of plastic pollution that can be detrimental due to animal ingestion, entanglement, and accumulation. Views and policies about marine debris removal are unknown among stakeholders of Virginia’s Elizabeth …

Considerations For Walking Adaptive Devices Used By The Older Adult Population For Functional Mobility, Amanda Beth Firoved

Rehabilitation Sciences Theses & Dissertations

Statement of the problem: Walking adaptive devices (ADs) are commonly used by older adults to increase stability and prevent falls, yet the effectiveness and safety of these devices remain uncertain. This dissertation study investigates the impact of ADs on older adult falls through evidence-based practice concepts of best research evidence, patient values and circumstances, and clinician expertise. Methods: Three distinct studies were conducted, each addressing an essential aspect of EBP. The first study, representing the best research evidence, explored the effect of AD on gait spatiotemporal parameters and motions at the center of mass of twenty-five healthy participants. The second …

Combine Effects Of Heavy Storm, Sea Level Rise, And Wind-Induced Surge On Flooding In A Low-Gradient Coastal Watershed In Eastern Virginia, Rutvik Rajendrabhai Patel

Civil & Environmental Engineering Theses & Dissertations

This dissertation examines and presents mechanisms of flooding in a low-gradient coastal watershed, located in Virginia Beach, Virginia, USA. The watershed comprises the North Landing River watershed and the West Neck Creek watershed, both characterized by a low topographic gradient. The analysis relied on examining simulations generated using one-dimensional and two-dimensional HEC-RAS models. These models were developed using a 1-m digital elevation model (DEM) obtained from the U.S. Geological Survey (USGS). To calibrate and validate the models, unsteady flows resulting from historical hurricanes (e.g., Matthew, Sandy, and Isabel), southern winds, and/or rising sea levels were utilized. Some flows were caused …

Identification Of Quality Indicators Of Visual Based Learning Material In Technology Education Programs For Grades 6th - 9th In Greek Schools In Cyclades Aegean Islands, Spyridoula Tsouganatou

STEMPS Theses & Dissertations

The purpose of this dissertation is to identify quality indicators for visual based learning material for technology education classes for grades 6th to 9th. This is a three round Delphi study aimed in answering the following research question. RQ: What are the quality indicators that contribute to the successful selection of visual-based learning material that contribute effectively to transmitting pedagogical information in a technology education classroom for grades 6^th -9^th? The quality indicators were determined by the consensus reached by technology education expert panel/educators that have been identified for the contributions and expertise in the field of …

Autism At Work Across The Career Span: A Scoping Review, Kate Noel Warnock

Psychology Theses & Dissertations

This scoping review takes a career-span approach to the experiences of autistic people at work. Using Super’s (1994) life-span, life-space theory as a framework, I divided the literature into five career phases: Growth, Exploration, Establishment, Maintenance, and Disengagement. In each phase, I reviewed the challenges and facilitators that autistic people face, highlighting themes that have strong support in the literature, and areas that need further examination in future research. Additionally, I argue that Super’s career framework is not the most parsimonious way to describe the career trajectories of autistic individuals and propose modifications to the framework to better represent their …

Dynamic Soil-Structure Response And Failure Of Wood Utility Poles Under Hurricane-Force Wind And Non-Linear Cable Loads, Ramani Ayakannu

Civil & Environmental Engineering Theses & Dissertations

This dissertation presents the outcome of a study of the dynamic soil-structure interaction response of tapered wood utility poles embedded in various foundation soils subject to quasi-static and dynamic wind loads. The study includes the effects of nonlinear soil behavior with varying quantities of moisture and nonlinear cable tension loads on a class H1 wood pole. The natural frequency response of the pole is determined using a finite element formulation. The dynamic response in the presence of wind-induced forcing function is studied using a SAP2000 finite element scheme with wind speeds up to 220 mph. The natural frequency of the …

Comparing The Effects Of Task Experience And Interruption Source On Resumption Performance, Sarah Anastazia Powers

Psychology Theses & Dissertations

The timing of an interruption can be disruptive to task performance; however, the effect of participant control over when interruptions occur is not well understood. Further, it is unclear how participants’ experience with the primary task influences when they decide to address interruptions. Utilizing a 2 (task experience, between subjects) X 3 (interruption source, within subjects) mixed design, undergraduate students who had different amounts of experience with a computer-based medication dosage calculation task completed three trials of the task: once with the experimenter scheduling interruptions to occur at coarse breakpoints within the task, once with the participants deciding when to …

The Practices Of Instructional Design At Community Colleges: A Post-Qualitative Study Of The Mutual Invisibility Of Work, David Robert Niebuhr Tod

Educational Leadership & Workforce Development Theses & Dissertations

The work of instructional design in community college settings is woefully understudied. This study documents that work in three community colleges in the southeastern United States while placing it in the theoretical context of neoliberalism, and in line with that theoretical context, takes a post-structuralist stance in its methodological approach.

It is in the discourses of instructional quality, online teaching, and design that instructional designers and faculty engage with each other. In contrast to the more well understood working relationship in a four-year institution, the power relationships between these two groups have not been examined in a community college context. …

Visual Attention In Remote Vehicle Supervision: Examining The Effects Of Mental Models And Information Bandwidth, Michael Stanley Politowicz

Psychology Theses & Dissertations

Advances in automation and aviation technologies have been catalysts for the emerging market of Advanced Air Mobility (AAM), an ecosystem of novel aircraft concepts including package delivery drones and passenger carrying air-taxis. Future aircraft operators in this environment will be tasked with remotely supervising multiple highly automated aircraft on a visual interface while receiving less training than traditional pilots. More research should explore how an operator’s potentially limited understanding of an automated system affects visual performance and interactions between human operators and AAM technologies. This study examined the influence of mental models of an autopilot system on visual attention allocation …

Maneuverability Of Cuttlefish And Squid: An Integrated Kinematic And Hydrodynamic Analysis, Alissa Marie Ganley

Biological Sciences Theses & Dissertations

Turning is important for life underwater, playing roles in predator avoidance, prey capture, locomotion, and communication. While turning abilities have been explored in many taxa, little is known about maneuverability of cephalopods, such as cuttlefishes and squids. The objectives of this dissertation include: (1) quantifying the turning abilities of cuttlefish hatchlings and determining whether there are species-specific differences; (2) examining the turning capabilities of adult cuttlefishes, with the goal of comparing adult performance with that of conspecific hatchlings; and (3) quantifying how adult neritic squids perform turns to provide a broader context of maneuvering strategies in cephalopods. To investigate turning, …

The Effects Of Covid-19 Stressors And Supervisor Support On Emotional Exhaustion And Work Engagement, Meiqiao Gu

Psychology Theses & Dissertations

Since the onset of the COVID-19 pandemic, working conditions have worsened, subjecting employees to numerous stressors. Analyzing the impact of COVID-19 stressors on employees‘ well-being and work motivation is crucial. The job demands-resources model (JD-R; Demerouti et al., 2001a) provides a framework for evaluating how COVID-19 stressors affect employees‘ well-being and motivation in the workplace. Given the complexity of job characteristics during the COVID-19 pandemic, coupled with challenges in obtaining adequate support from supervisors who are also facing considerable work pressure, this study examines the continued relevance of the JD-R model in this evolving work environment. Specifically, four hypotheses were …

Inelastic Dynamic Response Of Two-Story Steel Frame Under Single And Dual Blast Loading, Jack Austin

Civil & Environmental Engineering Theses & Dissertations

This study presents a theoretical investigation of the influence of both single and dual blast loadings and their duration on the inelastic behavior of a two-story steel plane frame. The influence of the type and duration of blast loading on the frame dynamic elasto-plastic response is studied by numerically solving the governing differential equations of dynamic equilibrium. The effects of the degree of damping and steel yield stress on the frame performance are also identified. Terrorist bombings of buildings have become increasingly prevalent and need to be accounted for when designing structures to prevent excessive deformations and collapse that result …

Stability And Strength Of Glass Frp Beam-Columns With Biaxial Bending And Torsion Including Shear And Warping Deformations, Emad M. Amin

Civil & Environmental Engineering Theses & Dissertations

Presented herein is a study of the stability and strength of pultruded glass fiber reinforced polymer (Glass FRP) beam-columns with an I-shaped cross section subjected to biaxial bending and torsion including shear and warping deformations. Three coupled differential equations of equilibrium including second-order effects and geometric imperfections are formulated and solved using a finite-difference scheme. Laboratory experiments are also conducted on glass FRP members with applied torsion; axial load; combined axial load with biaxial bending; and combined axial load, biaxial bending and torsional moment, respectively, for comparison to the theoretical predictions. The theoretical results agreed well with the experiments for …

The Incremental Validity Of Feedback Orientation On Performance: Beyond C & G, Elissa Ann Liguori

Psychology Theses & Dissertations

The current study examined the incremental validity of feedback orientation to predict task and contextual performance above and beyond two robust predictors of performance (conscientiousness and cognitive ability). Additionally, this study tested if feedback orientation could ameliorate the effects of adverse impact. 185 adults employed in the United States completed a survey assessing their levels of feedback orientation, cognitive ability, and conscientiousness. It was hypothesized that feedback orientation would incremental validity to predict contextual (H1) and task performance (H2) above and beyond conscientiousness and cognitive ability. Furthermore, the authors expected that feedback orientation would ameliorate the effects of adverse impact …

Effect Of Lunar Magnetic Field And Lunar Regolith Simulant On The Growth And Bioactive Compounds Production Of Chlorella Vulgaris Microalgae, Jeries Philip Butros Abedrabbo

Mechanical & Aerospace Engineering Theses & Dissertations

Since humans last went to the moon on the Apollo missions, there has been a fascination with inhabiting and colonizing other planetary objects, starting with the Earth’s Moon, Mars, and recently Jupiter’s moon, Europa. However, there is still lack of knowledge and science behind many of the extraterrestrial environmental effects on biological organisms living on Earth. Therefore, there is a need to study how such environments would affect these organisms. Moreover, how can we attain sustainable living in such environments as well through self-providing life support systems (LSS), without the need to provide for additional necessities back and forth from …

The Impact Of Guided Notes Intervention On Learning Achievement, Quality Of Notes, And Perception, Bryan Richard Biggers

STEMPS Theses & Dissertations

Guided notes in the form of teacher-prepared materials that guide students through the lesson with cues and space have been recommended as a possible aid to support student learning. The present study investigated the results of guided notes on the students’ learning achievement, the quality of the students’ notes, and the students’ perceptions of note-taking. Sixty students were enrolled in an eight-week, asynchronous, online, general education course and were divided into nonintervention and intervention groups where the nonintervention groups took notes without support while the students in the intervention group took notes with guided notes during weeks two through seven. …

Inviting Submission: Isabella Beeton At The Englishwoman's Domestic Magazine, 1856-1865, Julie Megan Sorge Way

English Theses & Dissertations

Isabella Beeton, creator of the iconic domestic manual Beeton’s Book of Household Management, died suddenly in 1865, just before her twenty-ninth birthday. Her popular book survived to codify stereotypical Victorian female ideals. Yet the “Mrs Beeton” mythos camouflages a remarkable talent: far from domestic drudgery, Beeton maintained a vibrant career as a writer and editor at the Englishwoman’s Domestic Magazine (EDM), traveling widely to research the latest fashions and laboring behind the scenes to ensure the magazine’s success. Closely examining Beeton’s EDM work demonstrates how these formative, productive years shaped her later, more popular writing. Such a …