Digital Commons Network^™

Ecological Drivers And Temporal Dynamics Of Daphnia In A Diverse Environmental And Spatial Landscape, Crysta A. Gantz

Dissertations and Theses

In the modern era, commonly referred to as the Anthropocene, human-caused changes to the environment are prevalent and complex. The study of impacts to biodiversity and ecosystem functioning requires multi-faceted approaches that encompass scales of organization from genes to ecosystems. It is often difficult to tease apart whether species responses to environmental change are due to phenotypic plasticity or genotypic variation. Therefore, it is important to try to understand where variation originated, that is, to link a phenotypic response to a genetic change or to gauge whether the response is from the environment. In addition, neutral genetic variation arising from …

Evaluation Of Fano Resonance In Silver Nanotriangles And Complementary Triangular Apertures For Enhanced Refractive Index Sensing, Nabila Islam

Dissertations and Theses

This thesis presents a detailed investigation of plasmonic sensors based on silver (Ag) nanotriangles, focusing on the interaction of plasmonic mode with waveguide modes to achieve Fano resonance for enhanced refractive index sensitivity. For this purpose, Ag nanotriangles were chemically synthesized and were on indium tin oxide (ITO)-coated glass. The samples were illuminated with laser light of various wavelengths and polarization to excite surface plasmon in the nanotriangle. Observation and characterization of their plasmonic behavior was done experimentally using Photoemission Electron Microscopy (PEEM). Numerical simulations using the Finite Element Method (FEM) were performed that agreed with these experimental results and …

Design And Evaluation Of An Electromagnetic Band Gap Structure For Self-Interference Reduction In Mmwave Full-Duplex Systems, Adewale Kehinde Oladeinde

Dissertations and Theses

Full-duplex (FD) wireless is a new technology that allows a device to transmit and receive at the same time and on the same frequency band. It has the potential to double the capacity and spectral efficiency of a wireless link compared to the family of conventional half-duplex wireless systems. The key challenge in implementing FD wireless communication is self-interference (SI): a node's transmitting signal generates significant interference to its receiver. Several previous studies have demonstrated the potential to reduce SI and develop FD radios; however, these studies are mostly limited to sub-6 GHz systems. Previous and on-going research explored various …

Disentangling The Effect Of Criminal Legal System Involvement On Mental Health In The United States, Pui Ying Chan

Dissertations and Theses

BACKGROUND: Interactions with the criminal legal system (CLS), such as through arrest or incarceration, are relatively common in the United States (US) and are increasingly recognized as social risk factors for poor mental health. Previous studies have reported a positive association between CLS involvement and poor mental health, with some theoretical frameworks, including the ecosocial theory and the stress process paradigm, supporting a plausible causal relationship. However, prior research has significant limitations in providing casual evidence given possible reverse causation in cross-sectional studies and insufficient consideration for the dynamics between CLS exposures, mental health status, and related confounders over time …

Optimizing Boys' Motivation Over The Transition To Middle School: A Pattern-Centered Approach To Identifying Boys' Profiles Of Engagement And The Interpersonal Resources Important In Supporting Optimal Engagement Of Boys Across Sixth Grade, Brandy Anne Brennan

Dissertations and Theses

There are normative declines in student engagement during the transition to middle school, and studies indicate that these challenges may be especially problematic for boys. Given the limited empirical evidence offering ways to support boys' motivation, the main goal of this study was to understand ways we can help boys reach their full potential over the transition to middle school by examining the interpersonal resources from parents, teachers, and peers that sustain boys' optimal engagement across the first year of middle school. Using data from an existing longitudinal dataset of 191 sixth-grade boys (N = 366; 52% male) in …

Trauma-Born Generations And Intergenerational Conflict: A Study Of Tensions In The Contemporary South Korean, Daihyun Kim

Dissertations and Theses

This paper analyzes how traumatic events that have been repeated in modern Korean history have affected each generation's identity and emotional structure, and how intergenerational conflicts arise, are structured, and reproduced. This study divides the groups of people born in the period from "The Liberation" in 1945 to 2025 into four generations: the Industrialization Generation, the Democratization Generation, the Capitalist Generation, and the Isolation Generation. Each generation has remembered major historical events such as the Korean War, the Gwangju Democratization Movement, the IMF foreign exchange crisis, the Sewol ferry and the Itaewon disaster in a unique way, thereby forming an …

Urban Wildlife In Your Backyard: Community Experiences With Coyotes And Outdoor Cats, Clarissa Emma Cressotti

Dissertations and Theses

Urbanization reshapes ecological processes by fragmenting habitat and altering patterns of human-wildlife interaction, often reducing biodiversity. However, at the household scale, residential yards can either enhance or inhibit ecological connectivity - functioning as informal habitat stepping stones or barriers to wildlife. This thesis examines how residents' environmental attitudes, wildlife experiences, and socio-demographic characteristics influence yard-level behaviors and shape the presence of urban-adapted wildlife species, particularly coyotes and domestic cats, across the Portland, Oregon metropolitan region. A mixed-methods, social-ecological framework guided the analysis, integrating survey data from 244 households with wildlife detections from motion-triggered cameras (Urban Wildlife Information Network, UWIN), citizen …

Emergence Of Norms In The Presence Of Social Network Structure In A Stochastic Evolutionary Game Theory Model, Parker Foresman

Dissertations and Theses

In their 2000 paper, The Emergence of Classes in a Multi-Agent Bargaining Model, Axtell, Epstein, and Young introduced an agent-based bargaining model to study how social norms can emerge and persist from the decentralized, asynchronous interactions of individual agents in the presence of noise, even when these agents have no predefined preferences or advantages. This thesis extends their model by incorporating structured interaction networks, allowing us to investigate how the topology of agent interactions influences long-run dynamics and norm formation. Using a custom simulation package built in the Julia programming language, we replicate the original results under a complete …

A Groundwater Flow System Investigation In The Upper Rowena Creek Drainage, Oregon, Catelee Yamei Kambur

Dissertations and Theses

Groundwater level declines are a growing concern within the upper Rowena Creek drainage, Oregon. This area is home to a small community located on the upper limb of the Columbia Hills anticline, where local residents rely on aquifers within the Columbia River Basalt Group (CRBG) for domestic water supplies. Groundwater level declines in CRBG aquifers have been studied more extensively in the Mosier area, which lies approximately 5 miles to the northwest of Rowena, but there has been little research conducted specifically on the upper Rowena Creek drainage area. Rowena is located higher up the dip of the Columbia Hills …

Analyzing National War Propaganda Through Comparison Of Diverse Case Studies, Ike Sugitani

Dissertations and Theses

In the build-up to war, national governments utilize propaganda to gather public support for the war effort. In some instances, propaganda campaigns are conducted but war does not occur. This begs the question as to why war follows propaganda campaigns in some cases, but not in others. I argue that propaganda efforts that lead to war can be generally characterized through three major strategies based on a patriotic participatory social structure, a claim to moral authority, and the blending of individual concepts of the state, government and nation. In this study, I analyze the major historical case studies of the …

Fostering Meaningful Learning: Experiences Of Linguistically Diverse Trainers In Early Childhood Care And Education (Ecce) Professional Development, Anna Howell

Dissertations and Theses

Linguistically diverse trainers play a critical role in reshaping professional development (PD) within Early Childhood Care and Education (ECCE), yet their contributions remain marginalized within English-dominant institutional structures. This qualitative study explored how these trainers define and deliver meaningful learning experiences despite systemic barriers, limited resources, and monolingual policies. Grounded in critical constructivism, the research centered the lived experiences and voices of linguistically diverse trainers across multiple contexts. Through semi-structured interviews, participants shared how they co-constructed relational, culturally grounded, and linguistically affirming PD environments rooted in community knowledge and emotional connection. Findings reveal that meaningful learning occurs when training reflects …

Dwelling, Kelly Erin Mclysaght

Dissertations and Theses

dwelling explores the network of connections between time, the self, and physical space. People and place are layered, and memories haunt these blurred spaces. Poems follow several lines of questioning: what lingering presence does abuse leave in the body and in the home? Is it possible to inhabit and share space with these presences, and if so, what does that mean for identity, relationships, and safety? Through repetition, image, and syntax, dwelling constructs a maze, enacting the conflicting desire to both linger in memory and run from it, holding the haunting beauty of grief and loss alongside anger and alienation.

Mental Health In Prisons: Examining Variations In Disorders Across Custody Levels, Ariel Bysiek

Dissertations and Theses

The United States has a significantly large prison population with the number of people currently in a correctional facility being 1.9 million. Concern has been increasingly growing related to treatment of individuals in prison, particularly when it comes to solitary confinement. Many people believe that solitary confinement is unnecessarily cruel and debilitating to AIC's mental health. Studies have found contradicting information as to whether solitary impacts mental health. Part of the reason for this contradiction stems from the lack of measurement systems that are appropriate for AICs. The measures used in studies are meant for the general population, not individuals …

Discourse Analysis Of Partner-Focus In Intimate Partner Violence, Maureen Theresa Lowell

Dissertations and Theses

Intimate partner violence (IPV) involves behaviors that harm or threaten to harm an intimate partner; but more importantly, it involves the production of power and control in an intimate relationship that threatens a partner's liberty and wellbeing. As a wicked problem, IPV is challenging to unpack without reducing the complexities that give it its power. This study seeks to explore the complex nature of how abusive men's focus on their partner functions as a mechanism of abuse. To develop the concept of other-focus I draw on constructs of coercive control, power, and dominance. To investigate partner-focus, I conducted a discourse …

Alignment Of Perceptual Similarity Metrics With Human Perception, Abhijay Ghildyal

Dissertations and Theses

Perceptual similarity metrics are used for quantitatively evaluating the similarity between two images as it would appear to human perception. These metrics aim to mimic the human visual system, providing a more accurate assessment of visual similarity. Such visual assessments are considered to be more advanced than simple pixel-wise comparisons such as ℓ_p norm distances. Thus, a human-like assessment of visual similarity, makes the metrics valuable for applications in image compression, restoration, and enhancement, where evaluating perceptual quality is crucial. Perceptual similarity metrics have progressively become more correlated with human judgments on perceptual similarity; however, despite recent advances, the …

Critical Mineral Mining And Native American Rights, Spencer Beeman Janes

Dissertations and Theses

This thesis examines the intersection between critical mineral mining and Native Americans' rights. Critical minerals are essential for creating electric and sustainable energy sources that fuel the world's evolving technological landscape. The United States is making a concerted effort to mine these minerals on American soil due to their vital role in serving the U.S economy and national defense. However, many of these mineral reserves lie within close proximity to Native American reservations, and mining them directly impacts Native American communities. The development of critical mineral mines can offer substantial benefits to indigenous communities, but they also have the capacity …

Beyond Translating Cultures: Organizational Cultural Brokering And Latin@/E/X Community Resilience After The "Mobile Home Parks" Fire, Christine Atalie Da Rosa

Dissertations and Theses

As wildfires increase in frequency and severity in rural communities, disaster management agencies are seeking to collaborate with community-based organizations (CBOs) working with rural, low-income Latin@/e/x communities to build wildfire resilience. This qualitative case study examines the critical role of CBOs rooted in their local, predominately low-income Latin@/e/x communities as cultural brokers in supporting Latin@/e/x wildfire survivors following the 2020 "Mobile Home Parks" Fire in a rural county in Oregon. Drawing from 23 semi-structured interviews, three focus groups, a review of relevant documents, and participant observations, the research investigates how Latin@/e/x CBOs navigated the complex cultural landscape between wildfire survivors …

The Art Of Memory: The Medieval Peutinger Map, Amber Shrewsbury

Dissertations and Theses

The Peutinger map is an enigma: a twelfth-century map of the Roman Empire, it is secular and oddly shaped, its dimensions distorted to show Rome at the center of the world. Its creator, purpose, and provenance currently remain lost to history. Long considered by classicists to be a copy of a lost Roman original, the map has not been seriously examined by medievalists, possibly because it does not adhere to the Christian "T-O" style of medieval mappaemundi.

While other scholars have focused on what the Peutinger map reflects about ancient Rome, I have chosen to explore how the Peutinger …

I, As In We, Cj Maruyama

Dissertations and Theses

I, as in We is a hybrid collection of poems, essays, fictional letters, documents, and photographs through which the author revisits ancestors and explores their multiracial roots. Drawing on stories, interviews and research grounded in the Japanese American experience, the collection develops a call-and-response polyvocality that spans generations and geographies. In its use of white space, form experimentation, and tonal shifts, the work confronts the fluid, often ambiguous boundaries that shape identity. The compiled written and visual materials evolve into an original document--one that reaches toward heritage, belonging, and truth.

The People's Rivers: Early Environmental Regulation And The Oregon State Sanitary Authority, Avery Morgan Fischer

Dissertations and Theses

The environmental movement in Oregon can trace its origins to the turn of the twentieth century, where citizen activism and initiative led to the creation of an early environmental regulatory agency, the Oregon State Sanitary Authority. This creation established that the State of Oregon had a duty to preserve, not just the navigability or usability of rivers and waterways, but the quality and purity of its water. The Oregon State Sanitary Authority played an active role in maintaining and protecting the environment as a mandate of the people, and throughout its thirty-year existence battling industrial polluters, reluctant municipalities, and disinterested …

The Call Of Cucurrucucú, Rachel Olivia Blair

Dissertations and Theses

This is a site of geologic excavation; where charged voices like porous monoliths and forked-tongue shapeshifters call out in fragmented polyphony. What lies broken or misshapen, what can be pieced back together.

What is purity when the body that is being inherited is drowning in murky waters.

Occurrence Of Pesticides In Oregon Coastal Waters And Effects On The Intertidal Sea Anemone, Anthopleura Elegantissima, Gabriella Mae Bleil

Dissertations and Theses

Pesticides are used globally for a wide range of applications including agricultural, forestry, roadsides, freshwater systems, and personal use. While pesticides have ensured efficient crop production, they are frequently transported away from application sites and are ubiquitous in terrestrial and aquatic environments. Pesticides are often detected in watersheds and rivers globally, which can have unintentional toxic effects on non-target organisms by interfering with cellular processes, behavior, feeding, reproduction, and disrupting endocrine processes. The aggregating anemone, Anthopleura elegantissima, is an important species along the North American Pacific coast due to its symbiotic relationships that contribute to high productivity, and its …

Building Belonging Infrastructure In Cities: Arts/Culture-Based Critical Participatory Action Research And Youth, Kimberly Rae Nightingale

Dissertations and Theses

Belonging is a critical human need. Urban planning's history of bureaucratic expertise continues to champion the powerful, resulting in structures and procedures that still separate and damage city communities. This research challenges the current hegemony of urban planning that centers geography--the container of land--in its practice. Instead, centering the belonging of people to each other is the essential quality of healthy urban planning. A people-centered urban planning practice where the community's people are the experts and decision-makers of their own cities--and belonging is the primary objective--is long overdue.

Arts/culture-based critical participatory action research (PAR)--where the research questions, design, data collection, …

Sustainability Of Recycling Perovskite Solar Cells: Economic And Environmental Perspectives, Juan P. Herrera Meza

Dissertations and Theses

Perovskite solar cells (PSCs) are among the most promising next-generation photovoltaic technologies due to their high efficiency and low production costs. Nonetheless, concerns about the toxicity of lead-based absorbers and the lack of standardized recycling protocols present substantial environmental and economic challenges. This thesis provides a comparative life-cycle environmental and economic evaluation of eight state-of-the-art PSC recycling processes. This assessment adheres to ISO 14040/44 standards and combines environmental and cost analyses. Solvent reuse is explicitly modeled for recovery of each functional layer (back contact, absorber, hole-transport, and TCO/glass) to reflect industrial practices. The results show that while most methods reduce …

Let's Talk About Sex, Baby! Gender Roles In Parent-Child Sexual Communication, Alexandra Henrici

Dissertations and Theses

Parent-child sexual communication remains a fruitful avenue to increase safe sex behaviors, which are currently in decline by today's adolescents. Historically, mothers have reported engaging in parent-child sexual communication more than fathers do. Previous scholarship suggests this difference could be due to traditional gender role beliefs or conflicts with traditionally masculine attributes. Using social cognitive theory and social role theory, this study conducted a cross-sectional survey on parents of children aged 9 through 16. Positive relationships existed between outcome expectations, self-efficacy, and level of detail in sexual and reproductive health conversations between parents and children. Though no statistical difference was …

Adolescent Preventive Care Outcomes Before And After Covid-19 Onset: What Is The Role Of Telehealth?, Sarah Hayden Knipper

Dissertations and Theses

Adolescents are a developmentally distinctive population with unique primary health care needs; they comprise about 10% of Oregon's population and more than half are covered by the Oregon Health Plan (OHP). This dissertation investigated significant declines in preventive care utilization (well visits and HPV immunizations) among adolescents enrolled in OHP during the COVID-19 pandemic and the relationship between the decline in utilization and the rise in telehealth availability. The study focused specifically on the role of race/ethnicity, geography, and access to health systems in mitigating or exacerbating decreases in preventive care. A mixed methods approach was employed to understand not …

A Fifty-Year Assessment Of Historical Planning Processes And Green Space Distribution (1975-2025): A Case Study Of Portland, Or, Usa, Quadri Olatunbosun Taiwo

Dissertations and Theses

The Portland study examined past planning regulations and greenspace distribution over the period of fifty years, with particular attention given to neighborhood differences between invested and non-invested neighborhoods. This research utilized a mixed-methods approach through the synthesis of qualitative themes from oral narratives and archival records. Furthermore, I examined spatial greenspace using Normalized Difference Vegetation Index (NDVI) imagery. I tested the study hypothesis using the GIS Ordinary Least Squares (OLS) regression test to predict how key sociodemographic characteristics affect the provision of greenspace in non-white disinvested neighborhoods. The key findings indicated a consistent trend of inequity in greenspace, heavily shaped …

Reproductive Rights At Work: The Role Of Organizations In Menstrual Support, Emily Julia Ready

Dissertations and Theses

Painful menstrual symptoms affect up to 90% of people with uteruses globally. These symptoms can result in lost productivity at work and absenteeism for working individuals. Normative work structures have not been designed with accessibility and inclusivity for those with uteruses in mind. Therefore, women and those with uteruses have often had to work through barriers with no accommodations or systematic change. Currently, there is no published research in the United States on the nuances of the relationship between menstruation and work with the intention of exploring effective solutions. There has been discussion related to menstrual supportive policies, but there …

Support Beyond Services: Examining The Role Of Neighbor Relationships, Housing Staff, And Place In Mental Health Recovery, Kenna Estell Dickard

Dissertations and Theses

This dissertation explores the role of non-clinical support for individuals with serious mental illness (SMI). Through three interconnected manuscripts, this dissertation highlights the importance of housing staff support, places in the community, and neighbor relationships in fostering recovery for individuals with SMI. The first manuscript analyzes how housing staff support influences residents' well-being through an ecological lens. This study found that staff support is associated with reduced loneliness, higher residential satisfaction, and increased sense of community. This study also considers the role of self-determination as a moderator, demonstrating the importance of resident agency in maximizing well-being outcomes. The second manuscript …

Identifying The Drivers Behind The Decline Of Douglas-Fir And True Fir Species In Sw Oregon, Alexander Bryant Bentley

Dissertations and Theses

Increased levels of Pseudotsuga menziesii (DF) and Abies species (TF) decline throughout dry forests in the Klamath Mountains and Western Cascades ecoregions have been recorded in recent years, with preliminary evidence suggesting that factors influenced by changing climatic conditions and encroachment from fire suppression policies are primarily to blame. Yet, the physiological and environmental mechanisms of drought-driven tree decline are poorly understood across biophysical and spatial gradients. Given the complex relations that drive decline, determining the degree of influence of specific drivers is difficult, creating unique challenges for modern forest management. To elucidate the most important factors driving DF and …