Digital Commons Network^™

The Effects Of Physical Accessibility And Subjective Accessibility On Grocery Shopping Behaviors In Oakland, California, Huijun Tan

Dissertations and Theses

Existing studies underscore the complexity of urban accessibility, defined by a range of factors, including the city's physical layout and infrastructure as well as the subjective perceptions and experiences of its inhabitants. As urban areas continue to grow and diversify, gaining a comprehensive understanding of these varied interactions is imperative. This broader context highlights the necessity of investigating the interplay between physical and subjective accessibility, aiming to illuminate the specific challenges and opportunities faced by these communities in accessing necessary services. This study explored the relationship between physical and subjective accessibility and their consequential impact on grocery shopping behaviors among …

"We're Going To Tear Up The Caldera So We Can Have An Electric Car": Competing Perceptions And Spatial Dimensions Of Open-Pit Lithium Mining In The Mcdermitt Caldera, Oregon, Elizabeth Bartholomew

Dissertations and Theses

As the world attempts to pivot away from fossil fuels and other greenhouse gas-emitting activities that fuel climate change, the proposed technological solutions all require raw materials, resources, and land; each of which have their own logistical and political dimensions. Lithium, a federally recognized critical mineral that is considered a crucial element in modern battery production, plays a vital role in decarbonizing efforts. Under the banners of national security, resource independence, and carbon mitigation goals, the United States has incentivized domestic lithium extraction, expediting exploration throughout the American West. The McDermitt Caldera, spanning from southeastern Oregon into northern Nevada, is …

Synoptic Drivers Of Extreme Precipitation In The Upper Yuba Watershed Of California, Emma Nichole Russell

Dissertations and Theses

The United States state of California is vulnerable to both droughts and extreme precipitation events due to the timing and processes of precipitation in the region. California's annual precipitation is dependent on a few strong storms and in addition to its Mediterranean climate, leads to great variability in precipitation both within and across years. While efforts to reduce the impacts of extreme precipitation events have been implemented, forecasting for these events remains a challenge in regions with complex terrain and dynamic meteorological drivers. In order to improve forecasting and preparedness for such events, it is important to understand the range …

Exploring The Social Processes Influencing The Well-Being And Social Integration Of Systemically Marginalized Students In Higher Education: A Mixed-Methods Approach, Zeinab Abbas Hachem

Dissertations and Theses

Comprising two manuscripts, this dissertation employs a mixed-methods approach to comprehensively examine the intrapersonal and interpersonal processes influencing the socioemotional well-being and social integration of systemically marginalized students. The first manuscript quantitatively explored the relationship between ethnic identity commitment and indices of well-being, the mediating role of social relationships, and the moderating roles of gender and immigrant generation status among Latinx college students (N = 707). Results suggested that ethnic identity commitment was positively associated with socioemotional well-being. Although both types of relationships were significant mediators on their own, maternal (vs. peer) relationship quality was the stronger mediational influence. Furthermore, …

Dynamic Social Ecologies Of Students' Motivational Resilience: The Complex Relationship Between Family, Teacher, And Peer Support, And Students' Academic Coping And Reengagement, Kristen Elizabeth Raine

Dissertations and Theses

Drawing upon self-determination theory (SDT) based models of motivational resilience, the following dissertation contains three studies that expand upon the current literature by investigating how processes of motivational resilience, or children's general capacity to handle the everyday academic stressors they encounter at school, are connected to the complex social ecologies created by the intersecting contexts of school and home. Study 1 examined whether family motivational support predicted increases in student reengagement through its effect on subsequent levels of students' self-system processes of relatedness, competence, and autonomy in a sample of 590 early adolescents from an urban middle school in the …

Phytoplankton Community Dynamics In The Northern California Current System, Kristin E. Forgrave

Dissertations and Theses

The Northern California Current system is a productive coastal ecosystem encompassing a variety of temporal and spatial features. The photosynthetic microbial community plays a crucial role in supporting the rich ecosystem and its economically important fisheries. My research integrates data across location and two years to investigate the community composition of two major phytoplankton groups in this system: picocyanobacteria and photosynthetic picoeukaryotes (PPE). The abundances and sizes of the phytoplankton were measured using flow cytometry. I found PPE present at similar concentrations in both summer and winter seasons. Abundances of both PPE and picocyanobacteria were comparable in the winter, but …

Adopting Oer Course Materials: Instructor Experiences, Jenny Ceciliano

Dissertations and Theses

Traditional commercial textbooks used in postsecondary courses are often problematic due to their rigidity, tendency to mirror the dominant culture, and the substantial cost imposed upon students. Although replacing these texts with open educational resources (OER) can facilitate more equitable and inclusive pedagogical practices while removing a significant expense, there has been insufficient research surrounding instructors' experience of transitioning from a commercial textbook to OER course materials. Through semi-structured interviews with nine postsecondary instructors who teach with OER course materials, this basic qualitative study explores the experience of that transition. The findings indicate that adopting OER is a challenging and …

Crossover Of Supervisors' Perceptions Of Co-Worker Support To Employees' Well-Being, Shalene Joyce Allen

Dissertations and Theses

This study expands scholarly understanding of the positive impact of supervisors' perceptions of support on employee work-family and well-being experiences. Specifically, this study examines the role of resource-based positive crossover from supervisors' perceptions of co-worker support behavior to their employees. The current research draws on Systems Theory to understand the context, Conservation of Resources Theory to understand the type of resource purported to position individual resource gains, and crossover-spillover theory to understand the process through which resources crossover from supervisor to employee. Based on prior theory, this dissertation investigates a positive crossover effect of supervisors' perceptions of co-worker support at …

Exploring Evidentiary Approaches And Reform Potential In The Allies In Change Program For Abusive Intimate Partners, Julie Melissa Conner

Dissertations and Theses

This thesis examines the Allies in Change batterer intervention program, analyzing its curriculum components, alignment with evidence-based practices, unique features, limitations, and implications for domestic violence intervention. The study employs a qualitative mixed-methods approach, including curriculum textual analysis, word frequency count, a semi-structured interview with Chris Huffine, the curriculum author and program founder, and observation of a forty-hour domestic violence training provided for batterer intervention programs and facilitators.

The research begins by reviewing the literature on domestic violence intervention, highlighting the importance of evidence-based practices, cognitive behavioral techniques, and cultural responsiveness. It then conducts a textual analysis of the Allies …

Concolic Testing For Scripting Languages, Zhe Li

Dissertations and Theses

Scripting languages, such as JavaScript and Lua, are becoming more and more popular. They are typically easy to learn and use, making them accessible to a wide range of developers, even those with limited programming experience. Lua, for instance, is a lightweight, efficient, and versatile scripting language. It is designed to be easy to integrate into other systems and is often used as an embedded scripting language in larger applications such as NMap, which is a network scanning tool.

As another example, web front-end development with JavaScript (JS) is a popular choice for developers due to its ability to add …

Marketing In Higher Education: The Effects On The College Choice Experience Of First-Generation Latinx Students, David Cortez

Dissertations and Theses

The Latinx population in the United States has drastically increased over the last twenty years. During the same period, the number of first-generation Latinx students enrolling in higher education post-recession has also increased by as much as 1.5 million students. The expansion of the Latinx student population in Oregon has mirrored the national trend by exponentially increasing over the last 10 years. As the population of first-generation Latinx students grows, it becomes essential to explore the issues and barriers Latinx students face in making their college choices. Previous researchers have found that selecting the right institution is important to increase …

The Conflict Between The United States And Iran And Its Effect On Iraq, Sarah Alsalih

Dissertations and Theses

This thesis examines the dynamic interplay between the United States and Iran and its repercussions on Iraq in the post-9/11 era. Against a backdrop of historical adversities, the research delves into the evolving relationship between the U.S. and Iran, elucidating its multifaceted dimensions and the consequential effects on Iraq. The central inquiry driving this investigation is: "Against the adversarial historical backdrop of U.S.-Iran relations, how has the relation between the two countries changed and impacted Iraq throughout the post 9/11 era?"

Drawing upon a comprehensive analysis through the lens of diplomatic interactions, military interventions, and regional dynamics, this study seeks …

Dietary Saturated Fatty Acids Modulate Host Innate Immunity, Amy Lorraine Seufert

Dissertations and Theses

Nutrition, cellular metabolism, and inflammatory regulation of the immune system are interconnected, and advancing our understanding of this will greatly improve treatment of metabolic and inflammatory disease. Specifically, dietary saturated fats are becoming increasingly appreciated for their ability to modify innate immune cell function in mammals following absorption into the blood and lymphatic circulation systems. The work herein focuses on the capacity for lipids in the diet to modulate innate immune memory. My thesis first broadly outlines fundamental background, including: the evolution of human nutrition, the discovery of innate immune memory, and key topics that reoccur throughout the text surrounding …

An Examination Of The Impact Of Court-Appointed Fines And Fees: How Governmental Reliance On These Expenses Is Harming Vulnerable Communities, Rachel Elizabeth Couche

Dissertations and Theses

Fines and fees are commonplace in the United States criminal justice system as a form of punishment for both minor and severe offenses. While substantial research has demonstrated that these financial consequences disproportionately affect certain communities, studies that depict a narrative of these impacts are vastly underrepresented in the field. This project expands upon past literature by delving into the effects of these practices on individuals and their families. The current study outlines the findings from a content analysis of twelve semi-structured interviews on the impacts of fines and fees in Oregon. The findings create a deeper understanding of how …

Prosodic Analysis Of Wh-Indeterminate Questions In L2 Korean, Jung In Lee

Dissertations and Theses

Wh-indeterminate questions in Korean are potentially ambiguous due to the limited use of morpho-syntactic markers. When an explicit morpheme indicating the question type is not used, the disambiguation of the question relies, primarily, on prosodic cues. Drawing from previous studies of L1 Korean, this study examines the production and perception of intonation patterns of English L1 learners of Korean for wh- and yes-no questions in Korean. That examination allows speculation on potential L1 influence in the learners' production. Five English L1 learners of Korean who received formal instruction in Korean at a U.S. university completed a production and perception test …

An Analysis Of Citizen Participation In Spatial Plan Preparation, Case Study Of Gaborone City, Botswana, Bongani Tshidiso Ikaneng

Dissertations and Theses

In the dynamic field of urban planning, the significance of citizen participation in shaping spatial plans has grown substantially. Research exploring the significance of public participation in planning has become increasingly vital, highlighting the need to understand citizen’s contributions to the planning process. This study investigates the community engagement experiences of citizens in the development of a local plan, with a focus on Gaborone City, Botswana. With data that was collected through online interviews through Zoom, conducted in twelve neighborhoods between March and April 2024, which were recorded and transcribed, the study presents challenges articulated by residents about their participation …

Culture Or Power: The Eruption Of The Anglophone Crisis In Cameroon, Danielle Tagakou Talla

Dissertations and Theses

Located in Central West Africa, Cameroon has been the stage of a protracted conflict since 2016. The conflict called the "Anglophone crisis" is rooted in Cameroon colonial history. This is reflected in the composition of its population with a large majority of Francophones and only 20 percent of Anglophones. The subsequent thesis aims to examine the crisis between 2016 and 2022 and understand the shift in focus that happened in the early years of the conflict. Using a qualitative methodology, journal articles, books and recorded interviews will provide substantial sources to decipher the change from cultural focus to one of …

Uncovering The Dynamic Nature Of Fire Refugia Across Landscapes In Oregon's Western Cascades, Alec Scott Dyer

Dissertations and Theses

With increased fire activity, the presence of fire refugia is critical to support forest resiliency and mitigate large-scale vegetation conversion, however, the persistence of fire refugia within burn perimeters over time is uncertain. This study examines the dynamic nature of fire refugia by mapping the decline in forest cover over time, identifying spatiotemporal patch- and landscape-scale patterns and the biophysical drivers of delayed mortality following the 2020 Labor Day Fires occurring in Oregon’s western Cascades. After three years post-fire, delayed mortality accounted for an additional 8.5% of forest loss (total of 24,147 hectares in all five burns) compared to pre-fire …

Assessing The Climate Resilience Of Quercus Garryana In The Portland Metro Region, Jess Rose Nettle Shamek

Dissertations and Theses

In the context of rapid global climate change, understanding the resilience of local tree species is essential for fostering effective environmental stewardship and community hopefulness. Oregon white oak (Quercus garryana), an emblematic species in the Pacific Northwest, has faced significant habitat loss and degradation since settler colonization. However, it also exhibits a predicted resilience to climate change, potentially leading to a range shift and expansion. Species resilience refers to the capacity of a species to persist and adapt in the face of rapid global climate change. Beyond vulnerability assessments and niche models, we know little about this species' …

Cleaning The Dirty Pool: Testing Interaction Effects Using Different Panel Model Specifications, Rhiannon Berry

Dissertations and Theses

This exploratory study seeks to uncover the most effective approaches for constructing interaction terms within panel models. With no preconceived hypothesis in mind, the primary aim is to discern which modeling configuration yields the most robust results, laying the foundation for future research in statistical modeling. Using a large data set of sentencing reforms passed between the mid-1970s and mid-2000s, this study systematically assesses interaction terms and determines the most appropriate modeling. Different specifications of sentencing reforms at the state level within different modeling specifications will be explored to highlight which models are most appropriate in predicting imprisonment rates. By …

Bridging The Gap: Using Significance Modeling To Identify Data Gaps In Lithic Sites Within The Tualatin River Basin, Aaron James Reid Hood-Foster

Dissertations and Theses

Archaeologists commonly evaluate National Register of Historic Places (NRHP) eligibility for precontact sites in Cultural Resource Management archaeology under Criterion D. This focus on Criterion D can create the false paradigm that precontact sites are only significant by virtue of their information potential. This paper explores precontact sites in the Tualatin River Basin in northwestern Oregon and identifies some key deficiencies in the ways those sites are recorded and documented by archaeologists. This paper then discusses the development of a geodatabase of site attributes and a significance model with contributions and feedback from relevant parties and Tribal representatives.

The geodatabase …

Applying Decolonizing Theories And Methodologies In Archaeology To Two Collaborative Cultural Resource Management Projects, Cydney K. Lanthier

Dissertations and Theses

Decolonizing theories and methods were employed during two separate graduate research projects. The methods of the initial project were informed by political ecology, the landscape-level historical ecology theory, Tribal sovereignty, traditional ecological knowledge (TEK), Indigenous archaeology, and community based participatory research (CBPR). The initial project was based entirely on CBPR and purposed to gain National Register of Historic Places (NRHP) nomination as a Traditional Cultural Property (TCP) over a portion of the traditional landscape. This project was cancelled before completion. However, several methods involved in CBPR were employed before then. The second project took on more of the historical ecology …

Embodied Urban Political Ecology Of Oil: Social Reproduction In Oil ‎Geographies Case Study: Ahwaz, Khuzestan, Iran, Maryam Amiri

Dissertations and Theses

This dissertation examines the transformative impact of the oil industry on social ‎reproduction ‎‎within the urban and ecological landscapes of Khuzestan Province, Iran, and ‎its center, the city ‎of Ahwaz. Specifically, the study sought to understand the effects of ‎the oil industry on social ‎reproduction in three key areas: gender relations, race/ethnic ‎relations, and daily life ‎amidst ‎environmental pollution caused by the oil industry.

‎This is explored through three sub-questions: 1) How are hierarchical socio-‎spatial ‎relationships perpetuated through practices of ‎everyday life? 2) How are gender ‎relationships redefined and ‎reproduced in the oil city? 3) How ‎are ethnic relationships ‎redefined …

A Cognitive Approach To Supervisor Training Intervention Evaluation: Analyzing Change With Response Shift Theory And Models Of Measurement Invariance, Luke Daniel Mahoney

Dissertations and Theses

Field-based experimental training intervention research continues to grow in importance as a method of simultaneously testing and advancing the theoretical and empirical basis for designing and deploying interventions to improve people's lived experiences. Training interventions are often designed to create positive change in the workplace context, for example, by providing behavioral tools to supervisors to help them become more supportive of their employees. Such a training intervention was the focus of this intervention evaluation -- one focused on interpersonal dynamics between supervisors and employees. However, change is often complex and may manifest in ways not accounted for by conventional ways …

Resource-Constrained 2d Scene Recovery With Single-Photon Cameras, Daphne Ariadne Kurzenhauser

Dissertations and Theses

The modern world is built of images. However, in our goal to photograph and replicate what the human eye is capable of seeing, we are throttled by the restrictions of conventional imaging sensors in high- and low-illumination environments. Single-photon cameras (SPCs) have recently emerged as a promising alternative to conventional camera sensors for capturing images in challenging conditions such as high-dynamic range and fast scene motion. Compared to traditional CMOS cameras, SPCs exploit the arrival of individual photons rather than using an aggregate photon count to compute the brightness of pixels. However, SPCs are extremely resource-intensive, making them inconvenient for …

Artificial Intelligence As The Next Front In The Class War, Christopher Hill

Dissertations and Theses

For many years, artificial intelligence has been confined to the realm of science fiction, and while the technology has been in development, predicting the effects AI will have on our society has been a challenging endeavor. The release of ChatGPT in 2022, the subsequent mass adoption of the AI chatbot, and the response by other private firms in the field announced AI's permanent entrance into the public sphere. These recent strides made in the field of artificial intelligence reveal that the pace of technological development has outstripped the rate at which we are able to politically examine and understand these …

Undergraduate Students Of Color Raising Children And Persisting In Higher Education, Kimberly Denise Alvarez

Dissertations and Theses

Millions of undergraduate students have been identified as parents across the United States. Of those millions, a majority have been identified as undergraduate students of Color who are pregnant, parenting, frequently underrepresented, and often not equitably supported toward degree completion. The purpose of the qualitative single-site case study was to learn what undergraduate students of Color who are parenting have experienced, in terms of support for their continued enrollment, while earning baccalaureate degrees at Portland State University. Through an asset-based approach, this study elaborated on three key findings which include the persistent aspirations of undergraduate Students of Color (USPs of …

The Bonneville Power Administration In A Transformative Decade: A Study Of Collibration In Public Administration, Christopher M. Frost

Dissertations and Theses

In 1987, the Bonneville Power Administration (BPA) celebrated its 50th year as a federal agency. It was created in 1937 to market power produced by federal dam operations on the Columbia River and provide electric transmission service in the Pacific Northwest region. A decade later, while its organizational mission had largely remained the same, BPA had undergone a major transformation both in its governance role with regional partners and as an institution of the Pacific Northwest. This study seeks to understand how this change occurred.

My research identifies three factors that enabled BPA to successfully respond to external challenges to …

Yang-Baxter Equations, David Lovitz

Dissertations and Theses

Multiple equations in math, physics, quantum information, and elsewhere are referred to as "the" Yang-Baxter equation, in spite of being a broad family of equations. Most of the equations are nonlinear matrix equations, where the unknown variable is a matrix. This is the case for the so called braided, algebraic, and generalized forms of "the" equation, which are the primary focus of this dissertation. Finding solutions to the various forms of these equations has been the subject of much research. The equations in all their forms are largely considered intractable in high dimensions, and only in dimension 2 have the …

The Influence Of A Ubiquitous Filter Feeder On Coastal Microbial Communities, Melissa Steinman

Dissertations and Theses

Doliolids are a unique study system for investigating the intricate relationship between pelagic tunicates and the marine microbial community. This study identified the eukaryotic and prokaryotic microbial taxa in wild-caught doliolids in the Northern California Current system. Doliolids were collected during bloom events identified at three different shelf locations with variable upwelling intensity. This study found that doliolids host a microbiome unique from that of the seawater surrounding them and that feeding by doliolids includes a range of prokaryotic microbial functional groups. This is the first study to identify that doliolids are a source of mortality for pelagic archaea, and …