Digital Commons Network^™

Online Activism And Real Life Environmentalism, Emily Grace Anderson

Dissertations and Theses

Past and present human activities have created and accelerated an array of environmental catastrophes and various systems in the environment remain under threat as a result of human behavior. In hopes of mitigating environmental consequences, a social movement has arisen to encourage people to behave in ways that are more environmentally sustainable. Research shows that individual behavior choices impact the environment, and this influence can be used to positively affect the environment through engagement in pro-environmental behavior. Like with many other social movements, the internet has been a tool in spreading awareness of a cause and allowing people the opportunity …

Regionalist Romance: "America Eats" And The Culinary Myth-Making Of The Federal Writers' Project, Icarus J. Smith

Dissertations and Theses

This thesis expands upon food historian Camille Bégin's assertion that the "America Eats" manuscript of the New Deal's Federal Writers' Project was "in tune with the interwar revival of regionalism" in the United States. Using archival material associated with the project and regionalist literature of the period, this study explores the dichotomies inherent in the broader regionalist movement of the Depression Era -- particularly using the project's treatment of the American West. Using foodways as the topic and regionalism as the intellectual framework, the FWP employees sought to document what they believed was the authentic culinary character of the nation …

Major Controls On Diagenesis In The Martin Bridge Formation: Wallowa Mountains, Oregon, Jane Lyra Eisenberg

Dissertations and Theses

Diagenetic alteration in carbonates has long frustrated scientists who wish to use their chemistry and/or texture to understand conditions at the time of deposition. Though indicators of diagenesis are well documented, their interpretation is not always straightforward. Despite the large volume of research on the subject, the positive identification and interpretation of diagenesis is a source of ongoing debate in the scientific community.

The goal of this study is to better understand the timing of, and controls on, diagenetic alteration in the Martin Bridge Formation (MBF), a Triassic-aged limestone that was altered following deposition. Thirty-nine samples of MBF with differing …

Trump's Legacy In The Middle East: Strategic Shift And The Geopolitics Of American Foreign Policy In The Region, Bilel Kriaa

Dissertations and Theses

The last six months of the Trump administration witnessed interesting developments regarding its legacy in the Middle East. The normalization of ties between four Arab states and Israel constituted major breakthroughs not only in the regional inter-state relations but also for the American foreign policy in the region.

In this context, this thesis offers insights into how to understand and evaluate the administration's approach towards these developments. Based on systematic and empirical research, I analyze a corpus comprised of Trump-era foreign policy documents regarding the Iranian and Israeli-Palestinian questions. I find, firstly, that the Trump administration pursued a strategic shift …

The Return To Anisotropy Across A Jet In Crossflow, Gregory P. Sakradse

Dissertations and Theses

With data from experiments on a jet of air emitting from an orifice flush with the floor of a wind tunnel providing a transverse flow, analysis is conducted to extract information about the state of anisotropy in the Reynolds stress tensor. Inflow velocities are modulated across two distinct turbulence intensity regimes while holding jet exit conditions constant, providing an opportunity to isolate effects of both jet to crossflow velocity ratio, r and the effects of the turbulence carried by the crossflow. Anisotropy in the Reynolds stress tensor is examined through anisotropy invariant maps and evolution of the function F, …

Freedom Vs. Security: Analyzing The Connection Between States' Prioritization Of Security Over Civil Liberties And Citizen Support For Democratic Norms, Carlyn Trumbull Madden

Dissertations and Theses

Is global democracy declining? This is a question many have argued over, leading to multiple, oftentimes contradictory, answers regarding causes and potential solutions. This thesis seeks to explore the question of democratic decline by analyzing changes over time in public opinion survey data in three states- New Zealand, Turkey, and the United States- looking specifically at how the government has balanced the tradeoff between security and civil liberties in the post-9/11 world. I argue that long-term government prioritization of security over freedoms has eroded support for fundamental democratic norms, as citizens willingly accept restrictions to their rights in exchange for …

Mid-Miocene Icelandites Of Eastern Oregon: Petrogenesis And Magmatic Lineage To Main-Phase Crbg With Constraints On Storage Sites, Melissa Aileen Carley

Dissertations and Theses

The La-Grande Owyhee eruptive axis is a mid-Miocene to Pliocene ~300 km long volcanic belt located at the eastern margin of the Columbia River Basalt Group (CRBG) in Oregon. Within this volcanic belt there are numerous vents that have produced a large volume of petrologically diverse rocks ranging from the tholeiitic flood basalts of the CRBG to rhyolitic tuffs of caldera complexes such as the Lake Owyhee Volcanic field. Icelandites, which are iron rich andesites, are known to occur in association with silica saturated to oversaturated tholeiitic basalts as a minor part of continental flood basalt volcanism. This study investigates …

Improved Predictive Modeling Techniques For Non-Linear Solder Material Behavior, Arman Millian Ahari

Dissertations and Theses

Accurate prediction of fatigue life of solder joints in electronic packaging applications becomes of critical importance as semiconductor device technology and manufacturing constraints grow in complexity. To gain visibility on IC device performance and reliability, thermo-mechanical simulation is performed based on a unified, viscoplastic material model, which is dependent on nine parameters.

In this study, an improved method of Anand parameter extraction, which involves curve-fitting non-linear experimental stress data, is proposed to improve the accuracy of numerical predictions for solder reliability. Theoretical equations for uni-axial stress-strain response and creep response are derived, then details on their relevance to experimental and …

Serfs, Excluded Or Governed By The State? Serfdom In Russia, An Historiographical Analysis, Jason Ferguson

Dissertations and Theses

Serfdom in Russia has often been viewed in Anglo-U.S. historiography as an exceptional institution in that it emerged in the early-modern age, after serfdom in Western Europe had ended, and that it persisted for well over two centuries, spanning the Muscovite and the Imperial eras. Many historians have thus compared serfdom in Russia unfavorably to labor systems that developed in Western European nations at that time, considered to be "modern" and "free," in contrast to the "unfree" labor obtained through Russian serfdom. This thesis presents the scholars who take this view, and refers to them as "Consensus Historians," as their …

Undrained Cyclic Loading Of Low Plasticity Silty Soils In The Pacific Northwest Using Laboratory And Field Cyclic Shear Testing, Angelica Melissa Preciado Reyes

Dissertations and Theses

The cyclic behavior of a fine-grained low plasticity silty soil (plasticity index of approximately 15) at a site in Portland, Oregon, is characterized using a field and laboratory cyclic shear test program. The field cyclic tests were performed using the NHERI@UTexas large mobile shakers T-Rex and Rattler. The laboratory tests were performed using resonant column torsional shear and cyclic direct simple shear devices. This testing program's results were used to evaluate the soil's potential to develop excess pore water pressure with cyclic shear strains ranging from 0.00001% to 3%. The laboratory cyclic test results are compared against field cyclic test …

The Worth Of Risk: Political Participation And Risk Perceptions, Siri Grubb

Dissertations and Theses

This study draws on concepts from political and risk communication to inform our understanding of what motivates people to be politically active. Inspired by concerns that traditional models of participation do not perform as well among younger and more diverse populations, alternate variables are considered including risk perceptions surrounding policy issues and political parties. Results show that established political variables such as political interest and civic duty remain strongly associated with participation, while offering support for several new variables of interest from the risk communication literature. In the present study, threat and efficacy perceptions explained additional variance in political participation …

My Mountain, Your Mountain, Our Mountain: Incorporating Emotional And Sensory Experiences In Mapping Sense Of Place In Mount Hood National Forest, Alicia Ranae Milligan

Dissertations and Theses

Understanding the complex connections humans have with landscapes is necessary for successful land management and planning practices. Only within the last few decades has mapping the values of forest users been used to produce data that can be incorporated into forest planning as a means to better understand social and environmental dynamics. This research used sense of place web mapping coupled with interviews to understand forest users' emotional and sensory experiences within the Mount Hood National Forest and to improve future sense of place mapping research. Two objectives were addressed in this research: 1) develop a typology of individuals' emotions …

Finding A Community Niche: Rethinking Historic House Museums In Oregon, Liza Julene Schade

Dissertations and Theses

This thesis discusses current preservation and public history in the field of historic house museums in Oregon, looking at two case studies that are undergoing processes of reinterpretation. The first chapter provides a brief history of heritage preservation in the United States, describes the spectrum of historic homes, and presents a key framework of four factors that need to be addressed when evaluating sites today. Current methodology refers to reinterpretation of sites to be more diverse, working with collections, doing research and restaging, along with innovating new programs. Public access and engagement pertain to finding a unique niche in the …

Selenium Probes For The Detection Of Thioredoxin Reductase Activity, Tendai Joseph Mafireyi

Dissertations and Theses

The identification and quantification of proteins and enzymatic activity in living tissues frequently requires the use of invasive procedures such as biopsy. These techniques can inhibit measurements of protein levels in real-time, and the disruption of tissue can lead to the loss of important information concerning the spatial distribution and differential activities in various cell types. The use of small organic fluorescent probes that rely on activation or accumulation within a tissue embody robust methods of detection that address these issues. This dissertation describes the design, synthesis and evaluation of fluorescent probes that can detect the enzyme thioredoxin reductase (TrxR). …

Forest Fire Effects On The Temporal Variability Of Landscape Snow Albedo Relative To Burn Severity, Max Gersh

Dissertations and Theses

Snow-water storage is decreasing, while forest fires are increasing in duration, size, frequency, and intensity, due to climate change. Most forest fires occur in the seasonal snow zone, altering snow mass and energy balance for many years following fire. Following forest fires, Surface snow albedo (SSA) decreases, as light absorbing particles (LAP), particularly black carbon (BC) produced in forest fires get deposited throughout the snowpack, altering snowpack energy balance driving earlier snowmelt in burned forests. While SSA decreases, landscape snow albedo (LSA) increases following fire, as more of the snow-covered surface becomes visible beneath the burned forest canopy, brightening the …

Mitonuclear Mismatch Is Associated With Increased Male Frequency, Outcrossing, And Male Sperm Size In Experimentally-Evolved C. Elegans, Brent William Bever

Dissertations and Theses

We provide the first controlled study of how male frequencies and rates of outcrossing evolve in response to mitonuclear mismatch by allowing replicate lineages of C. elegans nematodes containing either mitochondrial or nuclear mutations of electron transport chain (ETC) genes to evolve under three sexual systems: facultatively outcrossing (wildtype), obligately selfing, and obligately outcrossing. In partial support of a tenet of the mitonuclear sex hypothesis, which predicts that outcrossing will be favored in cases of mitonuclear mismatch, we found evolution of increased male frequency in at least one replicate line of all four ETC mutant backgrounds tested--nuclear isp-1, mitochondrial …

A Collaborative Approach To Cultural Resource Risk Assessment, Preservation, And Prioritization: A Case Study From Sauvie Island, Oregon, Phillip James Daily

Dissertations and Theses

New and increasing threats to cultural heritage resources have pushed archaeologists, land managers, and Indigenous peoples to develop strategies to identify at-risk resources, determine condition, vulnerabilities, and value of said resources, and then provide mitigation and preservation prioritizations and recommendations for the future. One such strategy is the risk assessment approach. Typically, to guide ongoing and future management of vulnerable cultural resources, risk assessments consider preexisting archaeological data, alongside geomorphological and hydrological landform characteristics, to prioritize sites for preservation. While such assessments have been conducted around the globe, they have not been widely applied on the Lower Columbia of Oregon …

Efficient Neuromorphic Algorithms For Gamma-Ray Spectrum Denoising And Radionuclide Identification, Merlin Phillip Carson

Dissertations and Theses

Radionuclide detection and identification are important tasks for deterring a potentially catastrophic nuclear event. Due to high levels of background radiation from both terrestrial and extraterrestrial sources, some form of noise reduction pre-processing is required for a gamma-ray spectrum prior to being analyzed by an identification algorithm so as to determine the identity of anomalous sources. This research focuses on the use of neuromorphic algorithms for the purpose of developing low power, accurate radionuclide identification devices that can filter out non-anomalous background radiation and other artifacts created by gamma-ray detector measurement equipment, along with identifying clandestine, radioactive material.

A sparse …

Mechanisms Of Substrate Recognition By The Cul3-Based E3 Ligase, Katia Graziella De Oliveira Rebola

Dissertations and Theses

Cul3-based E3 ligase is responsible for regulating a variety of cellular pathways, many of which are known to have profound effects on the proper function of multicellular organisms. Although progress over the past years has been truly impressive, our understanding of the mechanisms of E2 recruitment and selection by the BCR complex and all the roles that Cul3 plays on kidneys remains in its infancy. To explore these aspects, this dissertation aims to analyze the Cul3 complex using two different approaches: (1) We used the powerful tool of chimeric analysis to map the essential domain binding characteristics of Cul3 taking …

School-Based Sex Education In The United States And Its Association With Sexual And Reproductive Health Outcomes, 2000-2020, Priscilla M. Lopez

Dissertations and Theses

Background: There are significant sexual and reproductive health disparities in the United States (US). A significant proportion of sexual health disparities among adolescents is likely due in-part to inadequate school-based sex education. Sex education encourages sustainable and informed sexual behavior and has the potential reach adolescents prior to sexual debut and throughout the years at highest risk for adverse sexual health outcomes. However, the way in which sex education is defined and operationalized, as described in the literature, varies substantially, which may lead to wide variation in implementation in schools and this might explain the disparities seen. State-level sex …

Black Children's Development Of Self-Regulation Within Stressful Contexts Of Parenting: Investigating Potential Buffering Effects Of A Kindergarten Social-Emotional Learning Program, Eli Labinger

Dissertations and Theses

Children living in poverty are at an elevated risk for experiencing academic, social-emotional, and behavioral difficulties when beginning kindergarten, and early educational achievement gaps between economically disadvantaged and advantaged children are known to persist and widen over time. Black children face additional challenges related to racism, marginalization, minoritization, and oppression--processes which may, like poverty, impact their development by affording them fewer of the high-quality experiences that are critical for early learning. Fortunately, evidence-based social-emotional learning (SEL) programs offer tools to promote the social-emotional and behavioral competencies that support children's school readiness and early learning, and may counteract the adverse impacts …

Rhyolite Stratigraphy Along Succor Creek: Insights Into The Eruptive History Of The Three Fingers And Mahogany Mountain Volcanic Field, Cassandra Caryl Black

Dissertations and Theses

The Mahogany Mountain and Three Fingers calderas with their associated tuffs, the tuff of Leslie Gulch and tuff of Spring Creek, respectively, were the centerpiece of a larger rhyolite center that developed in response to Columbia River Basalt volcanism as numerous other mid Miocene rhyolite centers in a corridor from Baker City in the north to northern Nevada. Previous studies suggest a two caldera model, while others advocated for a single large caldera producing solely the tuff of Leslie Gulch. This study refines the eruptive stratigraphy along the northeastern margin of this rhyolite field with important implications for the entire …

Investigation Of Environmental-Friendly, Membraneless Hydrogen Peroxide Fuel Cells, Bao Nguyen

Dissertations and Theses

Human-induced climate change is one of the biggest threats to humanity in the 21^st century. This is caused by the increase in greenhouse gas concentrations in the Earth's atmosphere. The burning of fossil fuels is the primary cause of climate change. This problem can be addressed by replacing fossil fuels with fuel sources that have clean by-products and are cost-effective. For the last few decades, hydrogen (H₂) has been extensively studied as an alternative to carbon-based fossil fuels. Currently, H₂ still has many shortcomings for commercial applications. The photocatalytic production of H₂ still suffers from …

Improving National Health Management Information Systems: Stakeholder Views In Selected Sub-Saharan African Countries, Marie Donaldson

Dissertations and Theses

Background

Reliable, quality health information is the foundation of measurement and decision making in the health sector. Effective health management information systems can help improve the quality and coverage of health services, aid in policy development, support program implementation, and increase the likelihood that a well-trained health work force with the infrastructure and resources needed to provide appropriate health services will be properly distributed and supplied. There is widespread global agreement that data is a powerful tool. Arming Ministry of Health officials with better access to higher quality data that they know how to use can help improve health services …

Multi-Scale Environmental Conditions Associated With Shade-Tolerant Conifer Regeneration In Forest Park, Portland, Oregon, Matthew Cook

Dissertations and Theses

Forest Park is a 5,100-acre urban forest located in Portland, Oregon, that has been impacted by various anthropogenic stressors including logging, fragmentation, invasive species, air pollution and recreation use due to its proximity to the urban environment. This legacy of land use coupled with natural disturbances has resulted in changes to forest structure, composition, and function--threatening the long-term sustainability of the park. Past research in Forest Park has identified a lack of regenerating shade-tolerant conifers, particularly western hemlock and western red cedar species, in the section of the park closest to the city. Typically, western hemlock and western red cedar …

Exploring Mirna Function And Host Response To Coxiella Burnetii Infection, Madhur Sachan

Dissertations and Theses

Alveolar macrophages attempt to control bacterial infection through a spectrum of defense processes, including induction of apoptosis, autophagy, inflammatory response, and nutrient sequestration. MicroRNAs (miRNAs), a class of small non-coding RNAs, are involved in a spectrum of physiological processes, including immune response to intracellular infections. However, whether microRNAs have any functions in host response to Coxiella burnetii infection is unknown. Coxiella burnetii is a highly infectious intracellular pathogen that causes Q fever, a zoonosis with a worldwide occurrence. In this work, I investigated the functions of miRNAs in host response to C. burnetii infection and found that miRNAs are an …

Adoption And Use Of E-Grocery Shopping In The Context Of The Covid-19 Pandemic: Implications For Transport Systems And Beyond, Gabriella Abou-Zeid

Dissertations and Theses

In 2020, the COVID-19 pandemic drastically impacted travel for in-person shopping, commute trips, global supply chains, and food business operations. Previously mundane tasks, like shopping for food and household items, became markedly different as new social distancing and mask guidelines were put in place to mitigate the spread of COVID-19. Concurrently, e-commerce sales in the U.S. skyrocketed. E-grocery pickup and delivery services saw unprecedented expansions. The adoption and use of e-grocery services have implications for equity and mobility, although the nature of the relationship of e-grocery to the latter is still unclear. Enhancing our understanding of the drivers of (and …

Mechanistic Investigation Of Neuropeptide S-Nitrosylation By Nitric Oxide Moieties: A Kinetic And Thermodynamic Approach, Vusumuzi Leroy Sibanda

Dissertations and Theses

This dissertation focuses on providing quantitative insights regarding kinetic, thermodynamic and mechanistic parameters of neuropeptide S-nitrosylation by nitrous acid (HNO₂), peroxynitrite (ONOO^-) and S-nitroso-N-acetyl-D,L-penicillamine (SNAP) to produce S-nitrosothiols (SNOs). Peptide thiol stability and the formation of SNOs from neuropeptides; arginine vasopressin (AVP), somatostatin-14 (SST-14) and urotensin II (U-II) was studied. Investigations into the effects of temperature, copper chelators and pH on peptide thiol autoxidation show that AVP, SST-14 and U-II thiols have half-lives of 30, 44 and 28.2 mins respectively at physiologically relevant temperature and pH in the absence of metal chelators. Target peptide thiols were …

Automated Statistical Structural Testing Techniques And Applications, Yang Shi

Dissertations and Theses

Statistical structural testing(SST) is an effective testing technique that produces random test inputs from probability distributions. SST shows superiority in fault-revealing power over random testing and deterministic approaches since it heritages the merits from both of them. SST ensures testing thoroughness by setting up a probability lower-bound criterion for each structural cover element and test inputs that exercise a structural cover element sampled from the probability distribution, ensuring testing randomness. Despite the advantages, SST is not a widely used approach in practice. There are two major limitations. First, to construct probability distributions, a tester must understand the underlying software's structure, …

Quantum Grover's Oracles With Symmetry Boolean Functions, Peng Gao

Dissertations and Theses

Quantum computing has become an important research field of computer science and engineering. Among many quantum algorithms, Grover's algorithm is one of the most famous ones. Designing an effective quantum oracle poses a challenging conundrum in circuit and system-level design for practical application realization of Grover's algorithm.

In this dissertation, we present a new method to build quantum oracles for Grover's algorithm to solve graph theory problems. We explore generalized Boolean symmetric functions with lattice diagrams to develop a low quantum cost and area efficient quantum oracle. We study two graph theory problems: cycle detection of undirected graphs and generalized …