Digital Commons Network^™

Tidal Bed Stress Asymmetry And Sediment Transport In Estuaries, Austin Scott Hudson

Dissertations and Theses

Rivers and estuaries provide numerous ecological, economic, and cultural resources. The value of these resources is greatly influenced by sediment transport processes, which can be affected by human activities and climate variability. A key driver of sediment transport in tidal rivers and estuaries is tidal asymmetry of velocity and bed stress, which can manifest from both non-linear tidal interactions and linear interactions among astronomical tidal constituents.

In this study, an analytical framework is developed to examine and describe the dynamics of bed stress asymmetry in semidiurnal, diurnal, and mixed-tide estuaries (Chapter 1). While tidal velocity asymmetry has been previously analyzed, …

Forest Generating Functions Of Directed Graphs, Ewan Joaquin Kummel

Dissertations and Theses

A spanning forest polynomial is a multivariate generating function whose variables are indexed over both the vertex and edge sets of a given directed graph. In this thesis, we establish a general framework to study spanning forest polynomials, associating them with a generalized Laplacian matrix and studying its properties. We introduce a novel proof of the famous matrix-tree theorem and show how this extends to a parametric generalization of the all-minors matrix-forest theorem. As an application, we derive explicit formulas for the recently introduced class of directed threshold graphs.

We prove that multivariate forest polynomials are, in general, irreducible and …

Cognitive Engagement During Group Learning Activities In Chemistry Courses: An Analysis Of Student Discourse, Safaa Youssef El-Mansy

Dissertations and Theses

As educators, our goal is to help our students be successful, but in order to accomplish this, we need to understand what factors contribute to student success. One factor, small-group active learning, has been correlated to improved academic outcomes; however, the magnitude of this improvement can vary across different courses, different types of group work, and even across courses that use the same group work structure. Therefore, it is important to understand what aspects of group work contribute to its effectiveness. The work presented in this dissertation investigated one specific aspect: students’ cognitive engagement. This was done by analyzing the …

Beautifully Grotesque: Umezu Kazuo And The Shōjo Experience In Horror Manga, Miko Suzuki

Dissertations and Theses

"Mama's Scary" ("Mama ga kowai", 1965) by manga artist Umezu Kazuo took a new direction in depicting mother-daughter relationships by giving them a monstrous twist. "Mama's Scary" directly responded to how mother-daughter relationships were portrayed in 1960s shōjo manga, in which they were typically shown to be loving and caring, hence why adding horror elements to such relationship dynamics was considered jarring during the Shōwa era. Therefore, to analyze "Mama's Scary" is to also explore how women and young girls were portrayed in manga by men during the Shōwa era, and to analyze how adding the element of horror either …

Prosecutors Or Helpers: An Institutional Ethnography Of Child Protective Services Casework, Anna Maria Rockhill

Dissertations and Theses

The mission of child welfare is to strengthen the ability of families to care for their children and to protect children and provide aid, services, or referrals to families where maltreatment is said to have occurred. The vast majority of the families who become involved with child welfare are multiply disadvantaged and child welfare is a key feature of the array of public supports for struggling families. However, the institution fails many of the families it serves. Despite recent efforts by those in the field to promote collaboration and engagement, many parents experience child welfare as neither empowering nor helpful …

A Bayesian Network-Based Methodology For Improved Bridge Load Rating And Asset Management, Jeffery Mark Roberts

Dissertations and Theses

From the day a new structure is made available for use, to the day that the structure is no longer able to fulfill an intended purpose, structural safety is a vital interest. Managing a portfolio of structures can be a difficult undertaking for an asset manager, particularly if different types of structures are being maintained. The goal is to manage assets in the most efficient manner which can be influenced by, at a minimum, safety and financial concerns.

A potential tool for an asset manager or owner is the use of Bayesian Networks (BNs). When a BN is used to …

Evaluation Of The Slip History And Holocene Activity Of The Strawberry Fault, Grant County, Oregon, Andrew Dunning

Dissertations and Theses

Lidar topographic data for the Strawberry Mountains, Oregon has revealed youthful fault scarps that likely result from Holocene-age earthquakes. We have mapped 27 km of fault scarps striking roughly east-west across the northern foothills of the Strawberry Mountains (Strawberry Fault, SBF) and another scarp lineament striking north-south along the uppermost John Day River 10 km to the south. SBF scarps are aligned with the bedrock John Day Fault, a reactivated Miocene structure that is accommodating distributed extension north of the Basin and Range region. The Strawberry Mountains sit near the interface of the extensional Basin and Range province to the …

Using Biometrics, Behavioral Observations, And Multiple Molecular Techniques To Assess The Impacts Of Changes In Temperature And Salinity On The Common Bay Mussel (Mytilus Trossulus), Casey Martin

Dissertations and Theses

The intertidal zone is a place of rapid and frequent change that is home to a variety of creatures who are essential to the integrity of the habitat. Mussels are robust sessile bivalves that anchor to the rocks of the intertidal. The prominent species on the Oregon Coast, the Common Bay Mussel (Mytilus trossulus), plays an essential role as a coastal food source, water column filter, and barrier to prevent erosion due to wave action. Mytilus trossulus withstands daily shifts in temperature, salinity, and tide, as well as seasonal changes. Global climate change due to excess carbon emissions …

Critical Analysis Of Anti-Asian Hate In The News, Benardo Douglas Relampagos

Dissertations and Theses

Since 2019, the United States has had an increase in violence against Asian American Pacific Islander (AAPI) communities along with an increase of mainstream anti-Asian racist rhetoric. Between 2021 and 2022, The Center for the Study of Hate & Extremism reported an overall 164% increase in anti-Asian hate crimes. While racism against black, Indigenous, people of color (BIPOC) communities has been the topic of an ever-growing body of critical discourse, prior to 2019 few publications had addressed racism and injustice regarding language choices and discourse in the context of anti-Asian rhetoric in the US, specifically regarding the intersection of language …

The Impetus Of International Security In European Integration: The Nature Of Eu Common Security And Defense Policy, Osman Goktug Tanrikulu

Dissertations and Theses

This study explores the complicated relationship between security considerations and the European integration process. The research uncovers specific security factors that have shaped the EU integration process. Applying policy alignment and collective efforts for governance, this study offers a methodological improvement to the conventional status quo satisfaction concept within power transition theory.

Findings indicate that external militarized actions targeting European nations only occasionally disrupted integration in the short term. Instead, inner coordination among member states vis-à-vis external actors, promoted integration. During the early stages of integration, alignment with the EU collective was crucial, while aligning with regional leader Germany became …

Forest Fire Effects On Snow Storage And Melt Across Scales Of Forest Recovery In The Western Oregon Cascades, Megan Nicole Guinn

Dissertations and Theses

Snow is the largest component of water storage in the western United States, it serves as a key moisture source for forested ecosystems and is fundamentally linked to streamflow and nutrient cycling. Snow is vulnerable to climatic warming, and a key consequence of declining mountain snowpack is the escalation in wildfire frequency, extent, intensity, and duration across the seasonal snow zone. Fire modifies the spatial extent of snow in watersheds, reducing snow water storage and timing of melt across burned forests. Forested mountain ecosystems and water supplies are facing shifts in their structure, function, and succession. Previous research has focused …

Design And Characterization Of 2.4ghz Antennas For Wireless Sensor Applications, Luis Zogby Brennan

Dissertations and Theses

Wireless sensor networks benefit greatly from advances in circuit integration and miniaturization. However, antennas are bound to specific geometries both in terms of fundamental limits and their response to immediate surroundings. As such, various successful techniques for antenna miniaturization must still be carefully tested and characterized as part of the design process of a sensor system. The work presented here fully characterizes a number of miniaturized 2.4GHz antennas and successfully integrates designs into a sensor system using the highly integrated Single Chip Micro Mote (SCµM), which uses a crystal-less radio design resulting in the requirement of only a …

Modeling Leaf-Level Transpiration: Exploring The Consequences Of Assumed Saturated Vapor Pressure In Leaves, Danlyn L. Brennan

Dissertations and Theses

Understanding the dynamics of water transport through leaf intercellular airspaces (IAS) and its impact on transpiration is crucial for accurate predictions of plant water use and ecosystem response to changing climates. This study investigates the implications of assuming undersaturation of water vapor in the IAS for transpiration predictions and explores potential modifications to standard modeling approaches.

A dynamic 1D soil-plant-atmosphere continuum using a stomatal optimization model (SPAC-SOT) framework was used to simulate the response of tree species, P. edulis, to prolonged drought and varying environmental conditions. Comparisons between two model assumptions (saturated vs. undersaturated IAS) reveal notable differences in …

Disappeared Streams And Flood Risk In Atlanta, Georgia, Baltimore, Maryland, Phoenix, Arizona, And Portland, Oregon, Gregory Chrisopher Post

Dissertations and Theses

Many urban streams have been moved, culverted, buried, or "disappeared" as urban infrastructure was constructed. This loss of natural streams provided land for urban development, but as climate change increases the frequency and severity of extreme weather events, these disappeared stream areas could threaten homes and other infrastructure with increased flood risk. This study developed spatial data layers to identify many of these lost streams for Atlanta, Georgia, Baltimore, Maryland, and Phoenix Arizona, using historical maps to find streams previously visible that disappeared by the present day. This process used the oldest available georeferenced maps from the United States Geological …

Left Out To Dry: Understanding The Social Experiences Of Ground Depletion In Washington State's Columbia River Basin, Alexis Lisandro Guizar-Diaz

Dissertations and Theses

Millions of water wells worldwide risk running dry due to overpumping, drought, and climate change. This study adopts a political ecology framework to investigate how economic structures and power dynamics shape the effects of groundwater depletion in a highly impacted region. It is based on qualitative fieldwork conducted in the Odessa Aquifer region of Washington State. This agriculturally productive region has experienced severe groundwater depletion, endangering communities and threatening water supplies for many, as agribusiness has intensively used deep water wells to irrigate high-value crops. This research addresses three key questions: 1) How do residents and households excluded from irrigation …

Leed Buildings And Green Gentrification: Portland As A Case Study, Jordan Macintosh

Dissertations and Theses

LEED certification has become highly popular in the United State under the current political climate of addressing climate change, however in the implementation of green initiatives like LEED, social and economic impacts are not being considered. "Green gentrification" through the implementation of green initiatives such as LEED can cause displacement to highly vulnerable groups of people, disproportionately dealing the environmental goods to the wealthy and the environmental bads to the low income groups.

Portland has a fairly large amount of LEED buildings, and the city and state emphasizes its goals for sustainability through the use of green initiatives such as …

Wasted Space, Ryan Martyn

Dissertations and Theses

This paper performs a spatial analysis of Portland, Oregon, with a focus on identifying and utilizing "wasted space," such as parking lots and vacant land, as strategic opportunities to enhance the completeness of the city. The planning concept of a "complete neighborhood" is defined as a locality that offers residents access to all essential aspects of daily life within a convenient walking distance. This notion encompasses elements, such as walkability, accessibility to essential services and amenities, sustainability, and equity. The objective of this study is to provide a more precise definition of the planning concept of a complete neighborhood and …

Stress-Reduction From Positive Support: Impacts Of Receiving Partner Capitalization Support On Veteran Stress/Work Stress, Maryann Dona Samson

Dissertations and Theses

Prolonged stress, a pervasive experience in the United States, has been linked to numerous adverse outcomes. The workplace commonly operates as a source of chronic stressors, in fact 25% of Americans find their job is the most stressful part of life. This tendency is particularly true for military veterans, who reliably experience elevated stress and burnout and low job satisfaction. Inspired by the pervasiveness and seriousness of the chronic stress issue, the current study addresses chronic stress in a veteran sample by examining the stress-protecting effects of social support. Whereas social support has traditionally been conceptualized as providing aid when …

Comparative Skull Morphology Of California Sea Lions (Zalophus Californianus) And Steller Sea Lions (Eumetopias Jubatus) In The Pacific Northwest And Implications For Hybridization, Ada Iris Garcia Garcia

Dissertations and Theses

Eumetopias jubatus (Steller sea lions) that breed on the Oregon coast are smaller than those found both in Alaska and California. During the breeding season, male Zalophus californianus (California sea lions) move past E. jubatus rookeries in Oregon on their way to their breeding rookeries in Southern California. Introgression potentially could explain the difference in size of Oregon E. jubatus relative to remaining populations. At Portland State University (PSU), the marine mammal collection of the Museum of Vertebrate Biology has over 200 skulls of Z. californianus and E. jubatus from throughout northern Oregon and southern Washington. To assess whether morphologically …

Left On "Read" And All Alone: Instigated Cyber Incivility, Shame, And Experienced Ostracism At Work, Alison Lucia Hunt

Dissertations and Theses

The mistreatment literature focused on workplace incivility has grown significantly over the past two decades, as it has been recognized as an omnipresent issue in the workplace. Workplace incivility presents itself as low-intensity rudeness in which at least one individual takes counter normative negative actions against another individual, and may take place in both office and remote work settings as well as through a cyber modality. These actions often occur in a spiral where the target of incivility becomes likely to perpetuate incivility later down the line. However, much of the incivility literature lacks a comprehensive understanding of the perpetrator's …

A Field, Petrological, And Geochronological Investigation Of The Chief Joseph Dike Swarm, Mary Joyce Mass

Dissertations and Theses

The Columbia River Basalt Group is the youngest continental flood basalt province in the world and covers an aerial extent of 210,000 km² covering Oregon, southern Washington, and eastern Idaho. Eruptions occurred between approximately 17 million and 6 million years ago, with 92% of eruptions occurring within the first million-year interval. Aside from mapping and some bulk compositional data, few studies have focused on the Chief Joseph dike swarm in NE Oregon, the main eruptive center of the Columbia River Basalt Group. Prior to this study there were no published age dates for the Chief Joseph dike swarm.

This …

Exploring Opportunities To Expand And Improve Prep Uptake In Vulnerable Us Communities., Pedro B. Carneiro

Dissertations and Theses

The implementation of preexposure prophylaxis (PrEP) in the United States has fallen short of meeting both 2020 and projected 2030 milestones, with less than one-third of those who would benefit most from PrEP choosing to initiate it. High discontinuation rates and persistently elevated HIV incidence underscore the need for improvement. However, opportunities exist to enhance PrEP uptake, supported by a growing pipeline of PrEP innovations. To achieve this, effective implementation of available tools to combat HIV and the inclusion of all communities as stakeholders are essential. One such tool is event-driven (ED) PrEP, also known as PrEP 2-1-1, which is …

Not On The Menu: Customer Sexual Harassment In The Restaurant Industry, Fernanda Wolburg Martinez

Dissertations and Theses

Despite the high prevalence of customer sexual harassment (CSH) paired with a high turnover in the restaurant industry, there have been few suggestions on resources that may attenuate the effect that bystander and direct CSH might have on strain--anxiety and depressive symptoms--and turnover intentions among restaurant workers. Based on the stipulations of the job-demands resources theory and the empowerment framework, the current study frames direct and bystander CSH as job demands that may be linked to employee strain and turnover intentions. Moreover, CSH preventive supervisor behaviors and organizational intolerance towards CSH are introduced as job resources that may weaken the …

Community Adaptations To Wildfire Risk In Central Oregon, Usa: An Empirical Study Of Inclusionary Practices In Collaborative Wildfire Risk Mitigation, Liam Resener

Dissertations and Theses

Adverse impacts of wildfire in Western North America have become increasingly present through the 21^st century, driven by landscape changes imposed by colonists in the 19^th and 20^th centuries. Community adaptations to wildfire will be necessary through the 21^st century to restore landscapes and protect the safety and livelihoods of people who live in at-risk areas. Wildfire risk extends across countless environmental and social systems, and individuals have competing ideas about what constitutes that risk and how to best adapt to it. As resources are being allocated to community adaptations, important questions emerge about the values …

The Influence Of Polystyrene Microplastics On Juvenile Steelhead Trout (Oncorhynchus Mykiss), Kaitlyn Marie Baker

Dissertations and Theses

Mass production of plastic within the past decade has led to over 100 billion tons of plastics being added to the world’s oceans through rivers and effluent disposal and decomposition. For marine environments, the sudden and constant growth of microplastics (plastics 1 µm to 5 mm in diameter), is of particular concern to top-predatory fish such as steelhead trout (Oncorhynchus mykiss), who passively or actively uptake microplastics while consuming prey. Previous research has demonstrated clear detrimental impacts of microplastic accumulation in bivalves, seabirds, and zebrafish, including decreased diet, reproduction rates, and metabolism, as well as increased rates of …

Exploring Nonprofit Views On Water Management And Conservation Strategies, Jillian Marie Farley

Dissertations and Theses

Valuing water resources presents a multitude of methodological and theoretical challenges, including economics, biodiversity, and cultural significance. Information is not readily available on the individuals working every day on water resource management and how they navigate such a complex topic. This project is designed to help all parties better understand the opinions of individuals working for nonprofit organizations and Watershed Councils in the State of Oregon about current methods of water resource conservation. The results reflect respondents’ personal views on the process and practices of valuing water and are designed to prompt deeper discussions between the organizations, communities, and policymakers. …

A Multimodal Discourse Analysis Of Nasa's Instagram Account, Danica Lynn Tomber

Dissertations and Theses

In an increasingly interconnected society where science and technology are advancing at a rapid pace, knowledge dissemination, specifically in terms of public engagement and popularization, must be both encouraged and critically evaluated. As an internationally recognized government agency that is dedicated to the advancement of space exploration and present on several social media platforms, the U.S. National Aeronautics and Space Administration (NASA) provides a useful lens from which to analyze large-scale messaging of multimodal scientific information. Although there is a substantial amount of linguistic research into political and government-based messaging in social media, there is not much literature on the …

Instructors At A Crossroad: Perceptions Of Collaboration And Support Intersect With Intentions To Implement A Cure, Justin Berl

Dissertations and Theses

An ongoing crisis of student drop-off from undergraduate science, technology, engineering and mathematics (STEM) education has led to a sustained call over the last 15+ years for the increased implementation of updated practices in undergraduate STEM education. Though over the past few decades many researchers have developed and analyzed the efficacy of various evidence-based teaching practices (EBTPs) designed to improve the state of undergraduate STEM education throughout the country, the rate at which these EBTPs are implemented in undergraduate STEM classrooms remains low.

In order to better understand the specific factors that affect individual instructors' efforts to implement EBTPs, we …

Resistance To Dna Interstrand Crosslinks In Escherichia Coli Arises Through Prevention Rather Than Repair, Travis Kim Worley

Dissertations and Theses

DNA interstrand crosslinks are particularly lethal lesions that form in DNA when certain molecules intercalate between complementary strands of DNA and form covalent bonds with both strands. Once formed, these lesions present an absolute block to replication and transcription, ultimately resulting in cell death. Because of this lethality, chemicals that form DNA interstrand crosslinks are found in nature as defensive chemicals produced by plants and microbes. Moreover, crosslinking agents have proven effective the treatment of dysplastic conditions and are often first line chemotherapeutics.

However, cancer cells can become resistant to DNA interstrand crosslinks. Unlike other DNA lesions, the double-stranded nature …

Structure-From-Motion Derived Snow Cover In Burned Forests Of The Western Oregon Cascades, Siobhan Ciafone

Dissertations and Theses

Forest fire occurrence in the western US has increased rapidly since the 1980s, and most western US fires occur in the seasonal snow zone. Burned forests influence snow accumulation and melt patterns for years following fire, and understanding drivers of variability in snow cover across a burned landscape at the basin-scale is necessary for accurate hazard prediction and water resource forecasting. Basin-scale surveys of snowpack are possible with remote sensing, but accurate sensing methods such as Light Detection and Ranging (LiDAR) are often cost-prohibitive. In the last decade, structure-from-motion (SfM), an optical remote sensing technique, has emerged as an affordable …