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Dynamics Of Flexible Freestanding Structures Under Ground Motion Excitation, Seyed Mohammadreza Farooghi Mehr Dec 2024

Dynamics Of Flexible Freestanding Structures Under Ground Motion Excitation, Seyed Mohammadreza Farooghi Mehr

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Freestanding structures are characterized by being unattached at the base, exhibiting rigid or flexible motion under ground motion excitation with various potential responses including rocking (rotation at the base about corner points), pure sliding, slide-rocking, and overturning. While rigid freestanding structures have been extensively studied, the behavior of flexible freestanding structures—particularly the interaction between modes involving sliding—remains underexplored. Existing literature has focused on the deformation and rocking motions of flexible freestanding structures through both analytical and experimental approaches, which have shown indications of sliding at the base. These findings highlight the necessity of incorporating sliding motion into analytical models to …

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Deep Learning Vision-Based Bridge Inspection With Resource-Constrained Unmanned Aircraft Systems, Ji Young Lee Dec 2024

Deep Learning Vision-Based Bridge Inspection With Resource-Constrained Unmanned Aircraft Systems, Ji Young Lee

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Bridge inspection is critical for ensuring structural integrity, extending the service life of infrastructure, and minimizing maintenance costs. As bridges age and endure increasing loads, regular inspections help detect early signs of wear, such as cracks or corrosion, that could impact safety and performance. However, traditional inspection methods are labor-intensive, requiring significant time, specialized equipment, and manual access to challenging areas, which can lead to costly disruptions. Additionally, reliance on human inspectors introduces subjectivity, with assessments varying by individual expertise. These factors highlight the inefficiencies and safety risks in current inspection practices, underscoring the need for more objective, efficient solutions. …

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Improving Thermionic Power Generation Via The Reduction Of Emission Barriers, Chace E. Franey Dec 2024

Improving Thermionic Power Generation Via The Reduction Of Emission Barriers, Chace E. Franey

Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research

This thesis investigates methods to improve the performance of thermionic energy converters (TECs) by reducing the emission barriers. A TEC generates electricity from thermal energy when electrons are emitted from a hot electrode (the emitter) through a vacuum gap and absorbed by a cooler electrode (the collector). Due to their lack of working fluids and inherently compact nature, TECs have garnered attention over the years for their potential as a means of power generation in space or high-grade waste heat recovery. Historically, however, the practical implementation of TECs has been hindered by significant technical challenges. Recent advancements in microfabrication techniques …

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Development Of A Surface-Mounted Strong Post For The Midwest Guardrail System, Gnyarienn Selva Kumar Dec 2024

Development Of A Surface-Mounted Strong Post For The Midwest Guardrail System, Gnyarienn Selva Kumar

Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research

This research investigated the development of a surface-mounted strong post for the Midwest Guardrail System (MGS), designed to replicate the behavior of the standard MGS post, a W6 x8.5, 72-in. long post embedded 40 in. into strong soil. The MGS is a strong post, W-beam guardrail system that has been successfully evaluated in many applications using crashworthiness criteria described in the American Association of State Highway and Transportation Officials (AASHTO) Manual for Assessing Safety Hardware (MASH). However, in some locations, conventional soil-embedded posts are impossible to install due to subgrade obstructions like concrete slabs, mow strips, utilities, and limited right-of-way. …

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Prevalence Of Autism Spectrum Characteristics In Students Taking Undergraduate Computing Courses, Rachel Michaela Mettenbrink Dec 2024

Prevalence Of Autism Spectrum Characteristics In Students Taking Undergraduate Computing Courses, Rachel Michaela Mettenbrink

School of Computing: Dissertations, Theses, and Student Research

The incidence rate of autism spectrum condition (ASC) has increased significantly in recent decades, as awareness of the condition and its impacts increases amongst clinicians, parents, and the general population. Medical literature has proposed that there may be a relationship between ASC and participation in the computing field. This study tests for the prevalence of autism spectrum condition traits measured by delivering the Autism Spectrum Quotient (AQ) to a population of undergraduate computer science students. We examine the relationships between AQ scores and students taking undergraduate computer science classes, sex, socioeconomic status, and parents in the computing industry. Additionally, we …

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Exploring Variably Saturated Flow Formulations For Modflow: Implementing A Fully 3d Richards' Equation In Modflow 6, Sebastian Vazquez-Gasty Dec 2024

Exploring Variably Saturated Flow Formulations For Modflow: Implementing A Fully 3d Richards' Equation In Modflow 6, Sebastian Vazquez-Gasty

Department of Civil and Environmental Engineering: Dissertations, Theses, and Student Research

This thesis explores the implementation of a fully 3D Richards’ equation solution into MODFLOW 6 to solve for saturated/unsaturated flow. Currently, MODFLOW 6 has limited capability for solving unsaturated zone flow problems by using the Unsaturated Zone Flow (UZF) package, which neglects capillarity and assumes vertical 1-dimensional flow. Various formulations of the Richards’ equation were first evaluated for their strengths and weaknesses. Various numerical solution approaches to Richards’ equation were also studied to understand the robustness and efficiency of different approaches and to select one that would best fit into the MODFLOW 6 framework. The MODFLOW 6 framework was also …

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Symptom Network Comparisons Between Pre- And Post-Concussion, Christine Salva Dec 2024

Symptom Network Comparisons Between Pre- And Post-Concussion, Christine Salva

UNLV Theses, Dissertations, Professional Papers, and Capstones

Increased awareness about the short and long-term negative outcomes associated with sport-related concussion has resulted in active monitoring of cognitive and symptom profiles of athletes using a variety of assessments. The traditional approach to interpretation of cognitive and symptom measures has been based on a latent construct framework where domain scores reflecting latent constructs representing cognitive or symptom domains are collected at baseline and then compared to those obtained after concussion during the acute injury phase, with repeated additional assessments to determine when cognitive and symptom alterations have resolved. More recently, network approaches have been used to examine changes in …

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Harmonizing Vaccine And Infrastructure Development To Tame Cholera Outbreaks Across Africa, Amira Mohamed Taha, Hussam Mahmoud, Emad M. Hassan, Mohamed M. Ghonaim Dec 2024

Harmonizing Vaccine And Infrastructure Development To Tame Cholera Outbreaks Across Africa, Amira Mohamed Taha, Hussam Mahmoud, Emad M. Hassan, Mohamed M. Ghonaim

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Vaccines and clean water shortages continue to give rise to cholera outbreaks in Africa. Coordinated efforts to increase vaccine distribution and improve physical infrastructure are needed while considering future outbreaks and water demands due to conflicts and climate events.

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Examining The Adoption Of Digital Transformation Initiatives In Higher Education Institutions: A Mixed-Methods Investigation Of Employee Perceptions And Decision-Making Processes, Donald Behneman Dec 2024

Examining The Adoption Of Digital Transformation Initiatives In Higher Education Institutions: A Mixed-Methods Investigation Of Employee Perceptions And Decision-Making Processes, Donald Behneman

Masters Theses and Doctoral Dissertations

Digital transformation refers to the strategic integration of innovative technologies, which include mobile devices, artificial intelligence, and cloud computing, to name a few. These digital technologies weave into business processes to drastically enhance and ultimately improve the customer experience, optimize operational efficiency, or forge new revenue streams (Beach, 2021). This mixed-methods study investigated the dynamics of digital transformation in higher education from the perspective of information technology professionals. There were four primary research questions: • Research Question 1 (RQ1): Does one or more demographic factor predict an employee’s level of decision-making in higher education as it relates to digital transformation? …

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Unravelling The Effects Of Knowledge-Sharing Dynamics On Crowdsourcing Contest Participation, Hanieh Javadi Khasraghi, Xuan Wang, Yaojie Li, Xi Mao Dec 2024

Unravelling The Effects Of Knowledge-Sharing Dynamics On Crowdsourcing Contest Participation, Hanieh Javadi Khasraghi, Xuan Wang, Yaojie Li, Xi Mao

Information Systems Faculty Publications

Crowdsourcing contests have emerged as a popular approach for organisations to leverage collective intelligence and tap into the expertise of a diverse crowd. Knowledge sharing in such contests is paramount in promoting individual or team participation. This study employs negative binomial regression analysis to explore the impact of dynamic knowledge-sharing features – knowledge volume, knowledge expansion, knowledge innovation, and knowledge popularity – on team participation, using data from 211 crowdsourcing contests hosted on Kaggle. The findings offer significant implications for researchers and practitioners regarding effective knowledge management within crowdsourcing platforms. Encouraging knowledge sharing and collaboration and promoting innovative practices can …

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An Interview With Lucia Lotempio, Jordyn Stinar Dec 2024

An Interview With Lucia Lotempio, Jordyn Stinar

Gandy Dancer Archives

No abstract provided.

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Msw Portfolio, Dallin C. Ball Dec 2024

Msw Portfolio, Dallin C. Ball

Graduate Student Portfolios, Professional Papers, and Capstone Projects

No abstract provided.

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Msw Portfolio: Education, Application, Reflection, And Growth, Catherine Ristvedt Keller Dec 2024

Msw Portfolio: Education, Application, Reflection, And Growth, Catherine Ristvedt Keller

Graduate Student Portfolios, Professional Papers, and Capstone Projects

Exploring and the social work competencies, values, and dimensions of practice. Defining and moving past positionality. Applying social work ethics, skills, and tools, and exploring how the Independent Living approach can influence the medical model for improved patient outcomes.

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Buried Pipeline Performance Under Surface Loading Using Finite Eelement Analyses And Innovative Soil Box Testing Methodologies., Adam Gabreil Cantrell Dec 2024

Buried Pipeline Performance Under Surface Loading Using Finite Eelement Analyses And Innovative Soil Box Testing Methodologies., Adam Gabreil Cantrell

Electronic Theses and Dissertations

Buried pipelines are used extensively in the utility industry to deliver natural gas to customers. Reasonable estimates indicated that there are approximately 26,000,000 miles of pipeline, of various diameters throughout the United States (PHMSA, 2018). For protection, and to relieve urban congestion, these pipelines are nearly always buried under ground. After the pipes are installed, however, there is little opportunity for inspection, or for supplemental protection, when needed. Thus, to reduce the likelihood of rupturing a natural gas pipeline, design guidelines that ensure consistent, minimum protection of these utilities, have been developed and implemented. Pipeline design and installation regulations for …

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Greek Key-Inspired Fractal Metamaterials With Enhanced Flexibility And Energy Absorption., Zhennan Zhang Dec 2024

Greek Key-Inspired Fractal Metamaterials With Enhanced Flexibility And Energy Absorption., Zhennan Zhang

Electronic Theses and Dissertations

Architected materials with intricate three-dimensional (3D) geometries offer unique properties and functionalities but face challenges in manufacturing costs and complexity. This research explores the integration of simple 2D Greek Key-inspired lattices into fractal designs to achieve exceptional mechanical performance. Using 3D printing and kerfing, these fractal structures demonstrate enhanced flexibility and energy absorption capabilities. Through three-point bending and in-plane tensile tests, the 2D fractal lattices exhibited a 600-fold reduction in bending force and a tensile stretch capacity of up to 520%, significantly outperforming brittle parent materials. Out-of-plane compression tests revealed a five-fold increase in energy absorption compared to honeycomb structures, …

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Defining The Peripheral Plasticity Of Nociceptive Afferents Following Spinal Cord Injury And Physical Therapy Intervention., Morgan Julianna Forston Dec 2024

Defining The Peripheral Plasticity Of Nociceptive Afferents Following Spinal Cord Injury And Physical Therapy Intervention., Morgan Julianna Forston

Electronic Theses and Dissertations

The focus of this dissertation is to explore the peripheral plasticity of nociceptive afferents following spinal cord injury (SCI) and whether it is exacerbated or induced when physical therapy-based muscle stretching, a therapy we have shown to be detrimental to locomotor recovery in rodents, is implemented post-SCI. Chapter I provides a brief introduction on sensory afferents with particular emphasis on nociceptive afferents and their multifaceted role within the peripheral and central nervous systems. Chapter II describes SCI epidemiology and common sensory related complications that occur in patients as well and pharmaco- and physical therapies that are employed post-SCI. Chapter III …

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Exploratory Learning In Two Modalities: Tabular Vs Graphical., Lianda Velic Dec 2024

Exploratory Learning In Two Modalities: Tabular Vs Graphical., Lianda Velic

Electronic Theses and Dissertations

In traditional educational settings, an instructor delivers a lecture prior to providing students a practice activity. Exploratory learning reverses this order to encourage active learning and engagement, typically improving learning outcomes. However, more research is needed in order to determine how to optimally design exploratory learning materials, and how differences in such design impact learning processes and outcomes. The current study investigated the impact of instructional order and activity modality type (tabular or graphical) on learning outcomes. Undergraduate students (N=252) were taught the statistical concept of consistency and the formula to compute standard deviation. In the instruct-first condition, …

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Early Career Teachers' Perceptions And Preparedness For Culturally Responsive Teaching When Teaching Black Youths With Behavior Challenges., Erica Brooks Dec 2024

Early Career Teachers' Perceptions And Preparedness For Culturally Responsive Teaching When Teaching Black Youths With Behavior Challenges., Erica Brooks

Electronic Theses and Dissertations

In my study, I explore the perceptions and preparedness of early career teachers in the context of culturally responsive teaching (CRT) when instructing Black youth with behavior challenges. Early career teachers play a vital role in shaping the educational experiences of their students. Their beliefs and readiness to employ CRT practices are critical factors in addressing the unique needs of Black youth, particularly those facing behavioral difficulties. I investigated the perceptions of early career teachers regarding the importance of CRT and its effect on the learning environment. I examined how these teachers perceive the value of cultural responsiveness in managing …

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Victims Unknown: An Evaluation Of The Way Louisville, Kentucky Communicated About Aids At The End Of The 20th Century, Alexander M. Vernon Dec 2024

Victims Unknown: An Evaluation Of The Way Louisville, Kentucky Communicated About Aids At The End Of The 20th Century, Alexander M. Vernon

Electronic Theses and Dissertations

This is thesis examines the way that printed news sources reported on AIDS during the height of the epidemic in Louisville, Kentucky. It compares between mainstream and grass-roots sources to work to identify shortcomings in reporting, and how reporting on a public health crisis can be improved upon in the future. It uses an intersectional framework to deconstruct why certain news sources reported on specific demographics of the population, across racialized and gendered lines. Chapter One analyzes the epidemic and then contextualizes the language that was used. Chapter Two focuses on mainstream local newspapers, while also defining demographics of AIDS …

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Patient, Provider, And Health System Characteristics Leading To The Delivery Of Low Value Health Care Services And Outcomes Of An Intervention For Mitigating Low Value Care., Philip Ray Rohrer Dec 2024

Patient, Provider, And Health System Characteristics Leading To The Delivery Of Low Value Health Care Services And Outcomes Of An Intervention For Mitigating Low Value Care., Philip Ray Rohrer

Electronic Theses and Dissertations

The United States spends more on health care than any other country, and Medicare accounted for nearly one-quarter of total personal health care spending in 2019. Waste within the health care system in the United States is estimated to represent approximately 25% of total U.S. health care expenditures. Low value care includes health care services that provide little or no benefit to patients, have potential to cause harm, incur unnecessary costs to patients, or waste limited healthcare resources. Low value care is estimated to represent roughly 10% of total health care waste, or between $75.7 billion and $101.2 billion dollars …

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Understanding How Social Media Influences Student Engagement Within The Classroom: Middle Grades Students' Perspectives., Anthony Dawyne Myrks-Brewer Dec 2024

Understanding How Social Media Influences Student Engagement Within The Classroom: Middle Grades Students' Perspectives., Anthony Dawyne Myrks-Brewer

Electronic Theses and Dissertations

This dissertation investigated the concept of student engagement and participation through the lens of middle school students. Studies and research show that overall student engagement amongst middle school-aged students is the most unengaged period throughout students' K-12 educational journey. Today's students live in a completely different generation from their guardians and parents due to the technology component, including smartphones making the element of social media more accessible. Social media is a platform that helps people communicate through various applications, and middle school students engage and participate in various social media applications daily. Student engagement is a critical component within education …

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A Little Bit Of Everything: Persistence Though The Pre-Medical Pipeline For First And Continuing Generation Students., Tana R. Didelot Dec 2024

A Little Bit Of Everything: Persistence Though The Pre-Medical Pipeline For First And Continuing Generation Students., Tana R. Didelot

Electronic Theses and Dissertations

This qualitative research study examines pre-medical college student persistence in their pathway to medical education. Through the framework of Terenzini and Reason’s College Student Persistence Model (2005), this work sought to understand the pre-college experiences, campus support factors, and external environments that help pre-medical college students to continue toward their goal of medical school entry. This study included pre-medical undergraduate students in the campus context of one public institution in the Southern Unites States. Pre-medical upperclassmen students were interviewed using a semi-structured protocol developed with the persistence framework. The analysis was conducted to obtain a more nuanced understanding of the …

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A Quantitative Evaluation Of An Innovative Family Treatment Court Program For Families With Co-Occurring Child Maltreatment And Substance Use., Ashley Rose Logsdon Dec 2024

A Quantitative Evaluation Of An Innovative Family Treatment Court Program For Families With Co-Occurring Child Maltreatment And Substance Use., Ashley Rose Logsdon

Electronic Theses and Dissertations

Substance use is linked to out-of-home care in over 40% of child welfare cases. This dissertation evaluated the experience of families with co-occurring child maltreatment and substance use in Family Recovery Court (FRC), an innovative family treatment court involving the judicial system, child welfare system, and behavioral health. Study One used a quasi-experimental propensity score match design, using administrative data and the North Carolina Family Assessment Scale for 68 families. The FRC group experienced better safety (substantiated repeat maltreatment), permanency (reunification), and well-being outcomes. The percentage of the FRC group who achieved reunification (81.2%) was significantly higher than that of …

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Understanding Carceral Pathways And Outcomes Of Marginalized Adults Who Use Drugs., Carmen Renee Mitchell Dec 2024

Understanding Carceral Pathways And Outcomes Of Marginalized Adults Who Use Drugs., Carmen Renee Mitchell

Electronic Theses and Dissertations

This dissertation is an examination of outcomes among substance users at various stages of the incarceration process divided among five chapters. Chapter One provides an overview of substance use disorder (SUD), incarceration, and wider justice system-involvement, and explores how the political economy of health theoretical framework can be applied to examine how the criminal justice system creates and perpetuates inequality among marginalized people who use substances. Chapter Two examines post-release health outcomes among the population of incarcerated people who use substances using a scoping review and finds that people in reentry with SUD have poorer overall outcomes that without transitional …

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Toward An Urban Food Commons: Participatory Action Research On Food Apartheid And Community-Based Agrifood System Governance In Louisville, Ky., Mary Abigail Rudolph Dec 2024

Toward An Urban Food Commons: Participatory Action Research On Food Apartheid And Community-Based Agrifood System Governance In Louisville, Ky., Mary Abigail Rudolph

Electronic Theses and Dissertations

This dissertation investigates the structural inequities fueling food apartheid in Louisville, Kentucky’s agrifood system and explores community-based governance as a path toward food justice. Through a participatory action research (PAR) framework, this study combines participatory geographic information systems (PGIS), focus groups, and autoethnography to engage directly with affected community members and collaborate with the Food in Neighborhoods (FIN) coalition. By prioritizing the voices of those most impacted by food insecurity, this research offers contributions to the fields of food justice, participatory governance, and urban food commons. The study situates Louisville’s food access issues within the broader neoliberal global agrifood system, …

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Nickel Electrocatalysts On Carbon Supports For The Hydrogen Evolution Reaction., Mohan Paudel Dec 2024

Nickel Electrocatalysts On Carbon Supports For The Hydrogen Evolution Reaction., Mohan Paudel

Electronic Theses and Dissertations

Hydrogen is an important energy storage alternative to fossil fuels due to its high energy density. Currently, most hydrogen is produced through petroleum feedstocks, which produce large amounts of carbon dioxide. However, a more eco-friendly method is the electrocatalytic splitting of water into hydrogen and oxygen. Efficient catalysts for the hydrogen evolution reaction (HER) are typically platinum group metals, which are rare and expensive. There is growing interest in developing HER electrocatalysts with earth-abundant metals for water electrolysis. Nickel, which lies in the same group in the periodic table as Pt and has similar chemical properties, is explored extensively for …

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Co-Emulation Of Robotics And Software-Defined Radio Based 5g Wireless Communications., Bhaskara Venkata Raju Garuda Dec 2024

Co-Emulation Of Robotics And Software-Defined Radio Based 5g Wireless Communications., Bhaskara Venkata Raju Garuda

Electronic Theses and Dissertations

The convergence of robotics and 5G wireless communication technologies has opened new avenues for real-time, dynamic robotic applications. This dissertation introduces a novel framework that integrates the Robot Operating System (ROS), Software-Defined Radios (SDRs), and 5G wireless networks to achieve seamless coemulation of robotic systems. The research emphasizes the unique features of 5G, such as ultra-low latency and high throughput, which enable critical applications like remote surgery, industrial automation, and autonomous vehicles. The methodology combines ROS for robotic control, SDRs for programmable communication channels, and 5G testbeds for high-speed, reliable data transmission. The experimental evaluation focuses on both position-based and …

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Ai-Driven Approach For Diagnosis Of Renal Transplant Rejection Based On Biomarkers Identification And Integration., Israa Sharaby Dec 2024

Ai-Driven Approach For Diagnosis Of Renal Transplant Rejection Based On Biomarkers Identification And Integration., Israa Sharaby

Electronic Theses and Dissertations

They kidney is a vital organ for which humans are fortunate to find a spare through transplantation to sustain critical body functions, offering a hope to those struggling with renal failure. Kidney transplant procedure is the optimal treatment for people who suffer from end-stage renal failure. However, there are posed challenges due to the risk of immune rejection and the limited availability of donors. Early detection of renal rejection can provide timely intervention and accurate diagnosis that are critical to improve the transplant outcomes. This study explores the innovative approaches for addressing the current challenges through biomarkers identification, imaging techniques, …

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Understanding Defect Dynamics In Black Phosphorene Under Noble Gas Ion Irradiation., Saransh Gupta Dec 2024

Understanding Defect Dynamics In Black Phosphorene Under Noble Gas Ion Irradiation., Saransh Gupta

Electronic Theses and Dissertations

Controlled introduction of defects in phosphorene using high-energy ion beams offers a promising route to design novel high-performance materials for energy technologies. However, this potential remains underexplored due to a lack of fundamental understanding of the atomic-scale mechanisms governing the production, accumulation, and temporal evolution of defects during ion irradiation. Here, we employ a combination of classical and ab initio molecular dynamics simulations to elucidate the effects of ion energy, angle of incidence, noble gas ion size/mass, and fluence on (a) defect generation (i.e., point defects, topological imperfections, voids), (b) atomic-scale mechanisms of defect formation and re-arrangement, and (c) defect …

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Differential Responses Of Human Neutrophils To Legionella Species., Hannah E. Hanford Dec 2024

Differential Responses Of Human Neutrophils To Legionella Species., Hannah E. Hanford

Electronic Theses and Dissertations

Legionella species are Gram-negative facultative intracellular bacterial pathogens commonly found in freshwater or soil environments where they survive and replicate within their natural protozoan hosts. Humans serve as an accidental host for Legionella species after inhalation of contaminated aerosolized water droplets or soil particles enabling the bacteria to enter the lungs, infect alveolar macrophages, and result in severe pneumonia. Evasion of degradation and proliferation within alveolar macrophages by Legionella species and manifestation of “Legionnaires’ disease” is dependent on the Dot/Icm type IV secretion system (T4SS). The T4SS apparatus is a needle-like channel for translocation of over ~350 effector proteins, depending …

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