Digital Commons Network^™

Landslide Mapping, Characterization, And Hazard Assessment With 3d Slope Stability Modeling In White Bluffs, Washington State, Anna Tsitsivas

Dissertations and Theses

Slope failures shape the landscape by moving unstable material downslope and, in doing so, become a great hazard to all those in their path. Understanding the mechanisms that control landslide location, timing, size, type, and runout - and therefore hazards - requires a deep understanding of the local geology, stratigraphy, and groundwater conditions. Along White Bluffs, in south-central Washington, landslides of several failure styles have likely been triggered by an increased water table in recent decades, threatening both farmland behind the bluffs and habitat below. This study focuses on characterizing potential groundwater sources and determining controls on spatial and temporal …

It's Going To Be Okay: Experiences And Perceptions Of People Who Seek Reassurance At Work, Liana Bernard

Dissertations and Theses

This study examined the experiences and perceptions of people who seek reassurance at work using a mixed methods (focus groups and experimental) approach. Reassurance-seeking is an attempt to elicit supportive communication from another person to help one reduce experienced anxiety. First, using focus groups with 32 participants, this study found that people seeking reassurance at work develop complex cognitive structures to reduce the prospective negative impacts of reassurance-seeking behaviors, particularly for those with marginalized identities. Then, in a 3x2 between-person experimental design in which employee gender and reassurance-seeking were manipulated, participants read a transcript of an interaction between an employee …

Sustainability Assessment Of Photovoltaic Cells In Cross-Functional Applications, Achyuth Ravilla

Dissertations and Theses

Achieving the G7 countries' net-zero emissions target by 2050 requires integrating photovoltaic (PV) systems into diverse cross-functional applications that support sustainable energy transitions across multiple sectors. This dissertation explores the economic and environmental sustainability of three such applications: agrivoltaics, lower-dimensional materials in perovskite solar cells, and PV-electrochemical water-splitting technologies for hydrogen production. Employing life cycle assessment (LCA) and techno-economic analysis (TEA), we address the knowledge gap in comprehensive evaluations of PV-integrated solutions.

The first chapter assesses agrivoltaic systems (AVS), which combine PV systems with agriculture to mitigate land-use conflicts while enhancing food and energy production. Findings indicate that AVS designs, …

Propagation Modeling Of Terahertz Reflections And Reflector Design For Mimo Channel, Thanh Ngoc Dan Le

Dissertations and Theses

Wireless communication has transformed connectivity, enabling seamless access across devices without physical constraints. Terahertz (THz) frequencies, ranging from 100 GHz to 10 THz, promise high-bandwidth channels crucial for applications like IoT and virtual reality. However, deploying THz communication faces challenges due to significant propagation limitations such as high attenuation and environmental absorption. The motivation behind this research is to develop a comprehensive understanding of THz propagation dynamics and utilize reflective surfaces to create multipath environments for an improvement in the capacity performance of MIMO channels.

This research investigates the potential of Multi-Input Multi-Output (MIMO) channels at THz frequencies to overcome …

Applying Positive Unlabeled Learning Techniques And Using The Kullback-Leibler Divergence To Improve Geothermal Surveying Assessments, Martín Thomas Rodriguez

Dissertations and Theses

As we face the current climate crisis, the discovery of geothermal energy resources has the potential to greatly reduce our dependence on fossil fuels worldwide. However, the development of any new energy infrastructure is expensive and depends on the willingness of energy agencies and developers to make initial investments based on calculated risk measures. One such measure, called geothermal favorability, is the likelihood that a site has conditions favorable for geothermal systems containing recoverable energy potential. Its prediction from existing geophysical datasets proves to be a nontrivial task. The prediction of geothermal favorability can be framed as a binary classification …

Evaluating The Multi-Valued Bartlett Processor, Daniel Robert Frister

Dissertations and Theses

A variety of approaches exist to track targets in the ocean using acoustic sensors, and the complex mix of source characteristics, environmental effects, and sensor array limitations can make the selection of an appropriate algorithm challenging. This thesis models in simulation a recently proposed signal processing method that is intended for use with a large rectangular sensor array to track the bearings of multiple sources. The method, referred to as the Multi-Valued Bartlett (MVB) processor, is an eigenvector beamformer that leverages the capabilities of large arrays to locate in bearing multiple sources simultaneously. The analysis of this thesis details the …

Faint Glimmers: Redrawing The Housewife In Yamada Murasaki's Talk To My Back, Ceres Lovelace

Dissertations and Theses

Yamada Murasaki's seminal manga collection Talk to My Back, originally titled Shinkirari, tells a story of a woman's gradual journey toward agency within the constraints of a nuclear patriarchal family. Set within the everyday suburban life of Chiharu in 1980s Japan, Yamada uses subtle visual cues and restrained narrative techniques to illustrate her protagonist's struggles and quiet breakthroughs as she questions her identity and renegotiates her role as a housewife and mother.

By exploring the often-overlooked inner world of a housewife, Yamada scrutinizes traditional gender roles and reveals the burden and psychological toll of the emotional labor imposed on …

Automated Verification Of Compiler Transformations, Yanzhao Wang

Dissertations and Theses

The ever-growing complexity of software and its target hardware makes it increasingly challenging to develop reliable compilers that preserve the semantics of source code during compilation. Traditional testing methods often lack sufficient test coverage and fail to identify subtle errors and undefined behaviors that can lead to compiler malfunctions. Furthermore, while formal compiler certification ensures semantic preservation through theorem proving, the inherent complexity of this process makes re-certification after each compiler revision substantially labor-intensive. This often significantly hinders the improvement of compilers.

This research aims to bridge the gap between increasing compiler complexity and the limited scalability of formal verification …

Readiness Of Cybersecurity In The Usa Energy Industry, Aaron Cavanaugh

Dissertations and Theses

Cybersecurity Readiness shows an organizations ability of applicant and application to be able to fully utilize computing resources through behaviors (e.g., training employees), practices, and processes, while managing risk through efficient controls in order to prevent, detect, and respond to outage scenarios using audit and assessment techniques. An evaluation of cybersecurity readiness for the USA energy industry assists industry decision makers to comprehensively assess readiness gaps for prioritizing a risk-based cybersecurity implementation plan. There is a currently a lack of a Multi-Criteria Decision Model (MCDM) to assist decision makers to comprehensively assess Readiness of Cybersecurity in the USA Energy Industry. …

Exploring Determinants Of Transit Recovery After The Covid-19 Pandemic, Udit Khandelwal

Dissertations and Theses

The COVID-19 pandemic significantly disrupted public transit systems across the US, resulting in substantial declines in ridership and revenue. At the same time, ridership has increased to different levels in cities. This thesis explores the determinants of transit recovery in American cities post-pandemic. It analyzes data from the National Transit Database (NTD) and employs a two-stage least squares (2SLS) regression model first laid out by Taylor et al. (2008) for data from 2000. Similar to the results of that paper, the thesis finds strong correlation between transit ridership and variables for transit supply and urban and demographic characteristics for 2019 …

Characterizing The Influence Of Metabolism On Steady State Water Exchange In Yeast As A Potential Mri Diagnostic Biomarker, Samantha Mumford

Dissertations and Theses

Under conditions of ionic equilibrium with the environment a cell maintains a constant volume yet rapidly exchanges water molecules with the extracellular space. The rate constant for steady state water efflux, k_io, can be measured using contrast enhanced magnetic resonance (CE-MR). The active water cycling (AWC) hypothesis is puts forward that k_io is primarily influenced by cellular ATP levels and H⁺ ATPase activity at the cell membrane. Due to the correlation between k_io and ATP levels, k_io is thought to be a probable MRI biomarker for metabolic diseases such as cancer. Yet, the molecular …

Education And Tolerance Of Homosexuality In Diverse Islamic Contexts, Camila Swift

Dissertations and Theses

This study examines the relationship between educational attainment and moral tolerance of homosexuality among Muslims in Algeria, Malaysia, Pakistan, and Turkey. Utilizing human development theory to understand how educational attainment affects social values, the analysis draws on data from over 5,000 respondents from the Pew Research Center's "World's Muslims" dataset, which includes responses from a nationally representative sample of Muslims in these four countries. Logistic regression models and predicted probabilities are used to explore how educational attainment relates to moral tolerance of homosexuality, adjusting estimates for various alternate explanations through the use of control variables. The findings reveal that the …

Far-Right Monologues And Extreme Identity, Benjamin Alexander Thigpen

Dissertations and Theses

My thesis is focused on the American far-right, by way of two sperate case studies, one centered on a contemporary movement (the manosphere) and one that has fallen from prominence (racist skinheads). Grounded in primary source analysis, my thesis builds off of the work of social movement theorists such as Sidney Tarrow, scholars of American politics like Richard Hofstadter, and emergent theories of social identity as laid out by Judith Butler and others. Through my analysis, I develop two theoretical arguments: first, that there are two distinct categories amongst far-right narratives (which I term offensive and defensive); and second, that …

Minimal Separating Sets In Surfaces, Christopher Nelson Aagaard

Dissertations and Theses

Given a connected topolgical space X, we say that L ⊆ X is a minimal separating set if removing L from X gives a disconnected surface, butremoving any proper subset of L leaves the surface connected. We classify which embeddings of topological graphs are minimal separating in an orientable surface X with genus g, and construct a computer program to compute the number of such embeddings, and the number of topological graphs which admit such an embedding for g ≤ 5.

Peer Group Influence On The Antecedents Of Academic Coping Over The First Year Of Middle School, Daniel Lee Grimes

Dissertations and Theses

The motivational model of academic coping provides a framework for investigating the motivational antecedents and social contextual influences on ways of coping with academic adversity during the transition to middle school. Two studies were conducted to investigate the roles of three motivational antecedent variables of academic coping: perceived control, autonomous motivation, and catastrophizing. Study 1 investigated relationships between the motivational variables and academic coping across the first year of middle school. Study 2 investigated peer group influences on the motivational variables and on academic coping. Data from an entire cohort of 366 sixth students in the only middle school in …

The Foodpunk City: Advancing Portland's Food Security Through A Shared Ideology Of Adaptation & Resistance, Nickolas Hash

Dissertations and Theses

Food injustice is a form of violence perpetrated by state and corporate actors against a constituency under their governing power, particularly impacting marginalized and impoverished communities. It denies individuals access to nutritious food, perpetuating cycles of poverty, inequality, physical health risks, and social exclusion. Grassroots movements have emerged to challenge dominant paradigms and advocate for food sovereignty, agroecology, and food anarchy. In Portland, the movement represents a nontraditional approach to food security that closely resembles the reactionary ideology of urban "punk" culture. Both groups prioritize community autonomy over food systems, sustainable agricultural practices, and resistance to oppressive structures that perpetuate …

Post-Wildfire Water Quality Dynamics: A Multiscale Examination And Predictive Modeling Of Stream Temperature And Turbidity In Western U.S. Watersheds, Junjie Chen

Dissertations and Theses

Wildfires, exacerbated by climate change and human activities, pose significant threats to water-related ecosystem services in forested watersheds. This dissertation investigates the multifaceted impacts of wildfires on stream temperature and turbidity, two critical water quality parameters essential for maintaining aquatic ecosystem health and human water uses. By integrating a comprehensive literature review, empirical data analysis, and advanced machine learning techniques, this research provides a nuanced understanding of how wildfires affect hydrological processes across various temporal and spatial scales.

The findings reveal significant regional variability and the complex interplay between climatic, geographic, and anthropogenic factors. For instance, the literature review highlights …

Machine Learning Framework For Predicting Reliability Of Solder Joints, Robert Lee Jones

Dissertations and Theses

This paper presents the techniques and framework to produce an explainable machine learning model for predicting the reliability of solder joints exposed to thermal cycle testing. While machine learning techniques have become prevalent for many engineering and data analysis tasks, the complexity of the model occludes valuable information which can be used to refine the data, tune model parameters, and aid in scientific discovery. By exposing the relationships within the model, users can have greater confidence in the use and employment of it. The purpose of this study is to show how useful relationships can be obtained from a traditional …

An Evaluation Of Sediment Transport In The Columbia River Basin: Before And After System-Wide Flow Regulation, Patrick Alan Haluska

Dissertations and Theses

Erosion and sediment transport are ubiquitous in every riverine ecosystem. Aquatic habitat eroded and sediment removal for infrastructure require deposition of upstream material to maintain morphodynamic equilibrium. A large percentage of total sediment transport occurs during relatively brief high flow events throughout the water-year. Dams are known to modify the ability for streams to freely transport sediment. Depending on the river size and dam type, downstream movement of sediment can be inhibited or completely eliminated. On the Columbia River, 14 dams are situated between the tidal-zone to the headwaters in the Canadian Rocky Mountains. The main uses of the dams …

Thermal Regimes Of Beaver Impacted Stream Reaches In The Tualatin River Basin, Miles Mayer

Dissertations and Theses

Climate change and urbanization are expected to cause major changes to hydrologic regimes over the Pacific Northwest Region. The Tualatin River Basin, an area of the Pacific Northwest just west of Portland, OR has been subjected to considerable water-quality issues, including stream temperature. As ecosystem engineers, beavers have the potential to mitigate stream degradation and, consequently, there is increasing interest in beaver-related restoration. However, different conclusions have been found on beaver dam impacts to stream thermal regimes. These differences have been attributed to geographical differences in study location and variability in methods and investigated spatiotemporal scales. We investigated summer thermal …

A Native American Perspective On Navigating The Academic World With Resilience And Honoring The Wisdom Of Native Elders, Shani Renee Johnson

Dissertations and Theses

The graduation percentage among Native American students has consistently remained at a discouraging 50 %, both in the past and at present. This study employed a narrative inquiry approach to investigate the low graduation rates among Native American students, from the perspective of a Native American educator and mother. This study examined the historical trauma and colonization experienced by Native Americans and how it has affected Native American families and communities, resulting in low rates of graduation among Native students. In addition, this study examined factors contributing to resilience by acknowledging Traditional Ecological Knowledge (TEK) and Indigenous Ways of Knowing …

Stricken By The Worst Type Of Sickness: The Communal Reaction And Response To Impaired Individuals In The Middle Ages, Alice Holland

Dissertations and Theses

Medieval communities often approached trouble within the fold collectively. This includes concerns over the health and safety of their individual members. This thesis examines the communal perception and treatment of disabled individuals in the Middle Ages. Using four twelfth-century miracle collections, The Miracles of Saint Gibrian (1145), The Life and Miracles of William of Norwich (1150-1172), The Miracles of Our Lady of Rocamadour (1172-1173), and The Miracles of Thomas Becket (1173-1179), I examine how communities created systems of care for their impaired members. In using these sources, which tell the stories of common individuals traveling to shrines for a saint's …

Itagaki Paru's Animalized Japan, Adoria Shanelle Walker

Dissertations and Theses

In the earlier works of manga artist and author Itagaki Paru, animal characters are used to prompt a discussion of the uchi/soto ("in-group"/"out-group") dynamic present in Japanese society. Throughout her most popular work, Beastars, and its supplemental short story collection Beast Complex, Itagaki tackles binary thinking and in-group versus out-group social politics using a blatantly obvious, yet nuanced and subtle herbivore-versus-carnivore, predator-versus-prey metaphor. The world she depicts in these works is full of misunderstandings caused by hastily made assumptions, sometimes instinctually quick. With her animalized characters, she explores human stigmatization and the poor treatment of those who do not want …

Diversity, Equity And Inclusion In Simulation-Based Education: Experiences From Multiple Academic Health Centers, Jesika Samuelson Gavilanes

Dissertations and Theses

The integration of Diversity, Equity and Inclusion (DEI) into healthcare professional training is critical in order to ensure positive patient outcomes and help combat healthcare disparities, leading towards health equity. There is not currently a standard specific to DEI awareness in healthcare education and training. One area of healthcare training is simulation-based education (SBE), which is training that is set up to be as close to a real environment as possible for healthcare professional training. There is little in the literature that addresses DEI within SBE, yet SBE is one area with the potential for making an impact in healthcare …

Pathways To Social Mobility: Examining Trades As A Career Path For Formerly Incarcerated Individuals, June Jenkins

Dissertations and Theses

Obtaining stable, paid employment is crucial for successful reentry into the community after incarceration, however, formerly incarcerated individuals face extensive barriers when entering the workforce. Trades may present a uniquely attainable career path for this population due to relatively low barriers to entry. To date, there is a lack of research investigating experience-based perspectives on the viability of trades training programs and trades careers in facilitating prisoner reentry. This study employs semi-structured qualitative interviews to investigate perspectives on trades as a career path for formerly incarcerated individuals as well as barriers to accessing and attending trades training programs. Interviewees include …

The Protective Effects Of Perceived Partner Responsiveness On Service Members' Drinking And Health Outcomes, Julia Maria Oosi Lynch

Dissertations and Theses

Stress is a known predictor of various adverse health behaviors and outcomes, such as poorer physical health, injuries, and mental well-being. Specifically, stressful events, including minor daily hassles, as well as major life changes and pressures that are perceived negatively, can lead to experiences of psychological distress. Psychological distress is commonly defined as symptoms of anxiety and depression, including worry, sadness, and hopelessness. These concerns are particularly acute for military families, who experience a unique set of stressors and loneliness due to deployments and separation, long shifts, and frequent relocations. Those experiencing psychological dFreistress are also more likely to engage …

Improving Biomimetic Passive Dynamics Of A Quadruped Robot Hind Leg Hip Joint With A 3d Printed Torsion Spring, Haonan Zheng

Dissertations and Theses

The Agile and Adaptive Robotics Lab is interested in researching the neuromuscular control network of legged animal locomotion. To validate the lab's understanding of biological neural control, synthetic neural networks are developed and applied to biologically inspired legged robots. For a synthetic neural network to operate in the same manner as a biological neural network and produce the same locomotor behavior, the robot that the synthetic neural network is controlling must also mimic its biological counterpart. Previous research produced a quadruped robot hind leg designed with biomimetic passive dynamics by installing spring and damper pairs at each joint, however, an …

Teeth, Chukwudaru Immaculata Michael

Dissertations and Theses

Teeth is an experimental novel draft that intricately weaves a non-linear narrative of the lives of two sisters, Lota and Jekein. Through their stories, the novel delves into the complex questions and experiences surrounding religious, patriarchal, and socio-political violence inflicted upon the female body and identity. Set in Nigeria, Teeth is presented by an omniscient narrator who offers critical perspectives on being, playing into the subtle nuances that define the lives of these women. The novel employs multiple points of view, echoing diverse perceptions of motherhood, nationalism, and belief in the context of authority and identity reclamation. Lota is depicted …

Seguir Adelante: A Qualitative Exploration Of Latino Farmworkers' Work And Non-Work Resources, Faviola Robles Saenz

Dissertations and Theses

Precarious work sectors within the United States have relied on Black and Brown labor for many decades. More specifically, Latino immigrant workers have been an exploited community within many dangerous workforces but especially within the agricultural industry. They are a crucial population for the labor and economy of the U.S., yet Latino farmworkers report feeling expendable, being discriminated against, and being exposed to hazardous working conditions. Due to these experiences, scholars have explored the role non-work resources have in providing support for this community, their social networks being especially beneficial for them. However, research on the links between their work …

Analyzing The Legitimacy, Effectiveness, And Legacy Of The United Nations, Hunter Wade Calley

Dissertations and Theses

This thesis examines the legitimacy and effectiveness of the United Nations since its establishment, while also exploring the shortcomings of its predecessor, the League of Nations. The legitimacy of the United Nations and the role the organization plays in the world of international politics, the flaws of the UN Security Council, and the impact of the Cold War on the legitimacy and processes of the United Nations are especially highlighted throughout this thesis.

The successes and shortcomings of the United Nations are best understood given the historical context of the League of Nations, the organization founded to bring world powers …