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The Method Of Periodic Averaging Applied To Reduced Coupled Mode Theory Models For Fiber Laser Amplifiers, Rebecca Nicole Bryant

Dissertations and Theses

Fiber laser amplifier (FLA) models are often implemented without rigorous mathematical justification or thorough numerical validation. Without a proper theoretical basis for assumptions and approximations, or a technical analysis of model performance, there is significant uncertainty about the limitations of any given reduced model and its suitability for an application. This research aims to address the lack of comprehensive assessment of FLA models by directly comparing distinct models and recommending a mathematical alternative to replace heuristic model-reduction techniques. The work in this dissertation is divided into two projects: a comparative study that uses existing FLA models to assess the validity …

Aid And Assist Cases In Multnomah County: An Exploration Of Ors 161.370, Savannah Jurasek

Dissertations and Theses

Individuals with severe mental illness (SMI) are highly overrepresented in jails. In Oregon, these individuals can be eligible for what is referred to as the aid and assist process (ORS 161.370) which is designed to facilitate restorative care in efforts to ensure that vulnerable individuals can rationally participate in their criminal proceedings. However, continuous escalation in aid and assist orders (109.3% between 2011-2025) has led to strain on the Oregon State Hospital, the primary care facility for this population. As a consequence, defendants with SMI are spending unnecessary time in custody, despite hospitalization admission guidelines governed by previously decided case …

Entre La Lucha: Familismo And Well-Being Of Latino Immigrant Families Navigating Manual Labor And Anti-Immigrant Sentiment, Faviola Robles Saenz

Dissertations and Theses

The United States' history of treatment toward Latino immigrants has been shaped by anti-immigrant sentiment and exploitative labor practices, creating psychological violence that harms their families' well-being. Although previous research has examined anti-immigrant sentiment, labor conditions, and familismo among Latinos, these areas are often studied in isolation, with limited attention to their intersections and how they are experienced across generations. Informed by history, prior research, and my lived experiences, this study qualitatively explored the intersections of anti-immigrant sentiment and parents' manual labor to understand how these contexts shape familismo and well-being among Latino immigrant families. This work was grounded in …

Expanding Transmobilities: Understanding Genderdiverse And Transgender Travel Behavior Through An Art-Informed Methodology, Nicholas Michael Puczkowskyj

Dissertations and Theses

Transgender and genderdiverse people face discrimination and harassment in public when making trips in Portland, OR. People who identify as genderdiverse or transgender create unique travel behavior due to the influence of their internalized and expressed gender identity and through interactions in public. This dissertation examines how gender identity influences the travel behavior of genderdiverse and transgender people and how these experiences influence their subjective wellbeing when making trips in Portland, Oregon. Traditional one-on-one interviews were conducted in conjunction with allowing the interviewees to produce art as a non-verbal form of expression and communication of their experiences making trips in …

Profiles Of Family Engagement In Head Start, Elizabeth Jane Tremaine

Dissertations and Theses

Families of young children are active participants in their child's transition to kindergarten. Head Start is designed to facilitate families' engagement in their child's learning experiences (Head Start Parent, Family, and Community Engagement Framework, 2018). This study explores family engagement in Head Start, its changes across the transition into kindergarten, and its relation to children's development of social-emotional and executive function skills.

The current study addresses limitations of previous research by relying on family perspectives of family engagement, approaching family engagement as a developmental concept, and taking a person-centered analytic approach that accounts for the multi-dimensionality of family engagement. This …

Acceptance Of Shared Autonomous Vehicles: Exploring The Attitudes And Perspectives Of Older Adults, Sara Sohaee Urbina

Dissertations and Theses

The fast development of autonomous vehicle systems will create major changes in how people move around. Previous research shows that these technologies can benefit older people who struggle with mobility, safety and access to transportation. Shared Autonomous Vehicles (SAVs) enable older people to achieve self-reliance while obtaining essential services which enhance their quality of living. The successful deployment of SAVs requires users to accept this new technology which they must also be willing to use. This research study investigates which elements affect older adults to adopt SAVs by using an extended Technology Acceptance Model (TAM) framework.

The research design of …

Growing Pains: The Loss Of Plasticity To Extreme Anoxia In Developing Embryos Of Austrofundulus Limnaeus, Patrick Ryan Clouser

Dissertations and Theses

Oxygen plays a pivotal role for most animal life on Earth, so much so that even short exposures to no oxygen, anoxia, can have severe effects on the animal's wellbeing. Conversely, aerobic recovery after anoxic insult can be just as detrimental. Some animals are the exception to this rule and demonstrate survival through anoxia and recovery. There has been a great deal of research around anoxia tolerant animals, but what remains unclear are the genetic underpinnings that determine the anoxia tolerant phenotype. RNA sequencing allows for the quantification of RNA transcripts within a sample, which can indicate if a gene …

Pieces Of The Pathway: A Qualitative Exploration Of Social Support For Individuals Navigating Houselessness, Desiree' Jane Duboise

Dissertations and Theses

Houselessness has long been an issue of pressing concern in the United States; and in Multnomah County, Oregon, approximately 10,526 people are experiencing houselessness. Social support has been identified as a critical factor in helping people navigate houselessness and will be explored in the current study. Specifically, the current study examines social support among populations with lived experience of houselessness as they navigate pathways through houselessness. The current study is situated within a broader study examining journeys through houselessness called the Pathways study, and it utilizes a subsample of individuals involved in the Pathways study. The Pathways study and the …

Emotion-Focused Teaching And Preschool Children's Social, Emotional, And Self-Regulatory Development, Brielle Emily Petit

Dissertations and Theses

Contributing to the literature on supportive mechanisms for children's development of social, emotional, and self-regulatory competencies, the current study examines the contributions of emotion-focused teaching in preschool classrooms. Emotion-focused teaching is a framework used within preschool classrooms that encompasses three domains of teaching that support children's development of emotion skills—how teachers display their own emotions or emotion-related behaviors and actions (modeling), the ways they respond to children's emotional expressions (responding), and how instruction is used to inform children about emotions and related processes (instructing). More frequent emotion-focused teaching has been shown to be a …

Disaster Justice: Queer And Disabled Mobilities And Infrastructures Of Care In The Pacific Northwest, Rachel Springer

Dissertations and Theses

This dissertation examines the social, political, and environmental pressures that drive LGBTQ+ migration to the Pacific Northwest and the social infrastructures people find on arrival. Drawing on thirty-four semi-structured interviews with LGBTQ+ adults who relocated between 2022 and 2025, it argues that these movements are best understood as responses to slow-onset disasters produced by the compounding interaction of legislative targeting and infrastructural violence.

State-level legislation targeting LGBTQ+ people—particularly transgender individuals—has fractured the geography of safety in the U.S., producing a landscape where civil rights, healthcare access, and everyday security vary dramatically across space. For those navigating these conditions at the …

Bullying, Early Sexual Debut, And Sexual Health Behaviors Among Adolescents In New York City, Valentina I. Ramirez

Dissertations and Theses

Adolescent sexual and reproductive health remains a critical public health priority in the United States, particularly given the persistent burden of HIV and sexually transmitted infections (STIs) among young people. Adolescents and young adults account for a disproportionate share of STI cases, reflecting ongoing gaps in prevention, early detection, treatment, and equitable access to sexual health care and services. These patterns are shaped not only by individual behaviors but also by broader social, structural, and developmental contexts that influence adolescents’ opportunities to engage in preventive sexual health care.

This dissertation examined associations between early sexual debut, experiences of bullying, and …

Intersectionality And Insurgent Citizenship: Women Of Color Feminism In 1970s New York City, Genevieve Bonner Davis

Dissertations and Theses

Not since the phrase "Ain't I a Woman" has African American women's intellectual leadership and insight been as visible and influential as the contemporary concept of intersectionality. Like Sojourner Truth's iconic intellectual intervention in the anti-slavery movement, intersectionality has experienced a similar trajectory of dissolution, distortion, appropriation, and popularization. Since its articulation by Black legal scholar Kimberlé Crenshaw in 1989, intersectionality theory has had a bumpy road to its buzzy, if controversial, status in the firmament of twenty-first-century political thought.

This thesis traces the origins of intersectionality theory through three distinct but intertwined phases. Phase one is the genealogy of …

Psychosocial Risk Factors And Recidivism Among Violent Offenders, Abbey Elizabeth Burgess

Dissertations and Theses

This study examined whether changes in LS/CMI domain scores between prison intake and release were associated with three-year recidivism among violent offenders following their release from custody. While the Risk-Need-Responsivity (RNR) framework emphasizes the importance of targeting dynamic criminogenic needs to reduce reoffending, relatively little research has assessed whether changes in domain-level risk factors translate into improved outcomes over time. Using administrative data from a state correctional system, this study analyzed domain-level changes in LS/CMI scores and their relationship to rearrest, while controlling for demographic characteristics, criminal history, and institutional factors. Results indicated that changes in most LS/CMI domains were …

A Qualitative Study Into The Impact Of Sweeps On Homeless-Serving Mutual Aid Groups In Portland, Or, Clover Javurek-Humig

Dissertations and Theses

Sweeps and land use enforcement are among the most persistent issues impacting unhoused communities. Mutual aid groups in Portland network with unhoused people regularly to mitigate the impacts of sweeps, provide direct aid, and build social capital among encampments. This study aims to understand the impact of policing and sweeps on mutual aid groups working with unhoused communities in Portland, OR. I conducted 18 interviews with mutual aid organizers and 8 months of fieldwork with mutual aid groups in Portland, OR in the years of 2025–2026. Transcripts were analyzed using a general inductive approach. This study finds that 1) Mutual …

Justice By Geography: District-Level Variation In Pretrial Release Outcomes Across Oregon, Ethan Loomis

Dissertations and Theses

AbstractOregon’s pretrial system operates under a common statewide legal framework, yet detention and release outcomes do not appear fully consistent across jurisdictions. Earlier research on pretrial decision-making has largely focused on judicial discretion, individual-level legal factors, and the use of risk assessment tools, while giving less attention to the district-level environments in which those decisions are made. This study examines whether variation in institutional capacity, political context, demographic composition, and socioeconomic conditions corresponds with differences in pretrial outcomes across Oregon’s circuit court districts.

The study draws from focal concerns theory, racial threat perspectives, and organizational approaches to court decision-making. Rather …

Shoplifting: Analyzing Spatial And Temporal Patterns, Elizabeth Petrenko

Dissertations and Theses

Shoplifting has contributed to significant losses in Oregon, reaching nearly $956 million in 2022. While overall property crime in Portland, Oregon, dropped between 2023 and 2024, reported shoplifting incidents increased by 50.0%. In Oregon, stealing property worth $100 or less is third-degree theft and a Class C misdemeanor. Second-degree theft involving stealing property between $100 and $1,000 is a Class A misdemeanor. Although often classified as petty or minor theft, shoplifting imposes strain on retailers, consumers, and communities, which raises questions about the spatial and temporal distribution of this crime. This study uses Portland Police Bureau (PPB) offense data to …

Arylation Of Nitrogen, Oxygen And Carbon Nucleophiles By Aryl(Tmp)Iodonium Salts, Joseph Jordan Hatton

Dissertations and Theses

Substituted aromatic rings are present in industry in a plethora of organic molecules such as pharmaceuticals, agrochemicals, materials and beyond. Therefore, methods for broadly installing aryl rings into other compounds to create substituted aromatic rings are valuable to many organic chemists. Historically these transformations are achieved through methods such as nucleophilic aromatic substitution and metal catalyzed cross-coupling. Nucleophilic aromatic substitution is a user-friendly method in this space but is limited by reliance on specific electronics. Metal catalyzed cross-coupling reduced the dependence on electronics in this space, but metals are generally unattractive reagents due to high costs, toxicity and challenges with …

Improving Explainability And Interpretability Of Neural Networks Via Hyperparameter-Extended Influence Functions, William Breslin

Dissertations and Theses

Understanding how model predictions and training outcomes vary with changes in data, features, and modeling choices is central to explainable artificial intelligence. This dissertation introduces a unified framework for explainability by generalizing classical influence functions to encompass user-defined hyperparameters embedded in the training loss, model architecture, or data representation. By extending influence functions in this way, the framework broadens their applicability and integrates multiple explainability techniques into a single, coherent approach. It provides a common mathematical foundation linking data impact, feature importance, and model design analysis, and supports a broad class of additional explainability analyses beyond these settings. The demonstrated …

Design And Implementation Of Error Estimators For Finite Element Eigenvalue Problems, Gabriel Esteban Pinochet Soto

Dissertations and Theses

We present three publications, all encompassed under the umbrella of a posteriori error estimation theory for eigenvalue problems for finite element discretizations. The central objective of the research is the development of a general framework for the study of reliable estimation of eigenvalues and eigenspaces. We introduce applications to problems of theoretical interest as well as problems arising in real-life scenarios, such as optical fibers. The first paper focuses on the implementation of a dual-weighted residual error estimator for a nonselfadjoint eigenvalue problems arising from the study of leaky modes in optical fibers---Maxwell's equations, Perfectly Matched Layers, and a conforming …

Local And Indigenous Knowledge, Innovation, And Sustainable Development: Creating Sustainable Futures Amidst Crisis Conditions At The Community Level, Carlos Andrés Arias

Dissertations and Theses

In 1987, the Brundtland Commission's Our Common Future (1987) made clear the need to reject longstanding development processes and focus on sustainable development. The Commission stressed that actual sustainable development integrates three elements: social development, economic development, and environmental protection. Though developed nations have achieved economic growth through conventional and extractive development practices, these practices have intensified natural disasters driven by climate change, increased food insecurity, and deepened poverty. This has acutely impacted Indigenous and local communities, many of whom face crisis conditions, such as war, terrorism, civil disorder, and their aftermath. Even so, many of these communities successfully implement …

Haapxtàm Ka'Ál Yimisapʰíkʰ We Dream For Our Children Indigenous Pedagogies In Early Childhood Education: Survivance, Truth Telling, And Healing On Native Land, Sara Anne Koyano

Dissertations and Theses

Since Time Immemorial, Indigenous Peoples have lived, learned, and thrived on this continent, exercising their inherent sovereignty as Original Peoples and passing down Indigenous ways of knowing, being, and learning across generations. US settler colonial violence and assimilation policies have had historical and contemporary detrimental impacts on Native children, families, and communities by attempting to disrupt the intergenerational transmission of Indigenous knowledges. Consequently, many young Native children in Oregon do not have access to educational opportunities that value, honor, and affirm their Indigenous identities and cultures, nor do they see themselves reflected in their classrooms and curricula. Furthermore, in 2019, …

Heat Pump Water Heater Cta-2045 Implementation Guidance For Maximizing Demand Response Impact, Dana Kahiwahiwa Paresa

Dissertations and Theses

Residential flexible loads, such as heat pump water heaters, have great potential for grid reliability services; however, their effectiveness depends on reliable performance in response to coordinated grid service requests. While the ANSI/CTA-2045-B protocol standardizes communication, it does not mandate specific functional behaviors, creating a mismatch in which the device may comply with the communication protocol but fail to meet performance expectations. This manuscript demonstrates the need for a ANSI/CTA-2045-B implementation guide by quantifying these discrepancies through gray-box conformance testing of market-available units followed by large-scale simulations.

Field testing results revealed a significant conformance gap. Tested units exhibited an average …

Modeling The Combined Effects Of Forest Fire And Climate Change On Snow-Water Storage In The Oregon Cascades, Joseph D. Vigil

Dissertations and Theses

Forest fire and climate change are reshaping the snow hydrology of the Pacific Northwest of the United States, yet the combined effects of these disturbances on snow accumulation, storage, and melt timing remain poorly quantified in these Mediterranean mountain watersheds. This study integrates field-based snow and radiation observations with physically based modelling to evaluate how postfire forest structure, postfire snow albedo decay, and future climate change influence snow-water storage in the Breitenbush watershed of the western Oregon Cascades. This work was conducted as part of a broader U.S. Army Corps of Engineers effort to improve postfire hydrologic prediction and flood …

Multiple-Valued Quantum Automata For Robotics, Yuchen Huang

Dissertations and Theses

This dissertation introduces a new type of quantum automata, their encoding and circuit realization. I concentrate on possible applications in robotics. Several methods and application of quantum automata and quantum circuit-based controllers for elementary robotic systems, with a focus on humanoid robot motion, emotion, and behavior generation are illustrated in detail. The research introduces several novel methodologies that bridge quantum computing principles with robotic control, aiming to overcome the limitations of classical deterministic and probabilistic approaches.

The dissertation first presents a quantum-circuit-based framework for generating non-repetitive and expressive (e)motions in a humanoid robot actor, using superposition and entanglement to produce …

Reinvesting In A Lived Experience Workforce: An Exploration Of Why Peer Support Specialists Leave The Field, Morgan Rae Pelot

Dissertations and Theses

Peer support specialists (PSSs) are individuals who use their lived experience of mental health challenges along with formal training to provide peer support to other individuals experiencing similar challenges. PSSs have only become integrated into the mental health care system within the last several decades. Recently, a study reported a trend of PSSs leaving the field of peer support, but there is a gap in the literature exploring factors that may influence this decision. This study examined if self-efficacy, motivations to join the workforce, and negative work experiences were related to workforce retention. A secondary cross-sectional analysis was conducted on …

Relational Histories: Exploring The Transmission Of Ceramic Technology In The Norton Sound Region Through Petrographic Analysis, Laurel Michelle Diciuccio

Dissertations and Theses

Ceramic technology in the Bering Strait region of the North American Arctic dates to approximately 2,500 BP and is broadly divided into two traditions: the Early Arctic (Norton, pre-1,500 BP) and the Late Arctic (Thule, post-1,500 BP). While Arctic ceramic studies have focused on raw material sourcing, vessel use, and cooking performance, this research investigates forming methods and ceramic fabrics to better understand their place in the technological behavioral chain. This approach fills a gap in the literature by centering on vessel construction and offers new insights from Norton Sound sites, including type sites Iyatayet and Nukleet.

Macroscopic and petrographic …

Scale-Dependent Particle Transport Over Urban-Like Roughness In Turbulent Flow, Rae Riddle

Dissertations and Theses

This study employs direct numerical simulation (DNS) to investigate the dispersion of inertial particles in turbulent flow over three-dimensional urban-like roughness at Reτ = 200. Particles with Stokes numbers St = 5, 25, and 100 are tracked over cubic arrays with spanwise spacings Sy from 2h to 32h, where h = δ/8 and δ is the half-channel height, alongside a smooth-wall reference case. The results reveal scale-dependent particle responses characterized by three distinct regimes. First, high-inertia particles (St = 100) align strongly with mean secondary flows, exhibiting organized plumes above roughness elements. Their vertical transport peaks at intermediate spacing …

An Applied Anthropological Study Of Conflict Reduction: Fostering A Culture Of Safety At A Homeless Service Organization In Portland, Or, Katelyn Champion

Dissertations and Theses

Hygiene 4 All's (H4A) hub of operation provides hygiene services and resources to houseless individuals in Portland, OR. H4A seeks to foster a culture of safety, sanctuary, and welcome. During an internship that took place between February and December, 2025, I studied the organization's policies and practices, with a focus on how their formal and informal processes worked to lessen moments of social friction, escalations, and violent incidents. I apply theory regarding organizational management, practice theory, design, symbolic interactionism, and trauma-informed care to contextualize the research. I employed ethnographic methods, including participant observation, interviews, and document analysis, to identify themes …

Effectiveness Of Peace Education And Recommendations For Implementation In The Sultanate Of Oman's School Curriculum, Vision 2040, Mohamed Al Braiki

Dissertations and Theses

This study explores peace education as an institutional process within the Sultanate of Oman's K–12 education system. Currently, Oman Vision 2040 articulates commitments to social cohesion, global citizenship, and holistic development. Existing empirical research indicates constant challenges related to bullying, student well-being, emotional distress, and school-related harm. This study conceptualizes peace education as a structural and relational mechanism embedded within institutional routines, leadership practices, and conflict-management responses. Using a qualitative integrative review design, the study examines peer-reviewed research, policy documents, and institutional analyses relevant to Oman, the Gulf region, and broader peace education scholarship. The analysis is guided by theoretical …

Reasoning In Large Language Models Across Multilingual, Long-Context, And Symbolic Settings, Sina Bagheri Nezhad

Dissertations and Theses

Large Language Models (LLMs) are increasingly deployed as general-purpose reasoners, yet their reliability degrades in three settings that frequently arise in practice: multilingual inputs, long contexts, and symbolic or formally constrained domains. In multilingual settings, uneven training coverage produces substantial performance disparities and uncertain generalization to languages with little or negligible pretraining exposure. In long-context settings, relevant evidence may be sparsely distributed, and models exhibit the "lost-in-the-middle" phenomenon, undermining retrieval and multi-step synthesis. In symbolic settings such as mathematics, small arithmetic or logical slips invalidate solutions, and prose rationales are difficult to verify automatically.

This dissertation first characterizes these failure …