Digital Commons Network^™

Mothers' Drinking Motives, Sheila Kathleen Umemoto

Dissertations and Theses

Increases in women's excessive alcohol use are leading to concerns about a developing public health problem since, for women, it takes fewer years and lower doses to develop a range of alcohol-induced health problems. Maternal status is generally considered protective against alcohol use; however, this effect is weakened by multiple social role strain, leading to higher stress and negative affect, and subsequent coping-related alcohol use. Given that the majority of mothers with young children are working or looking for work (72.3%; BLS, 2021), it is likely that the combination of competing demands and expectations associated with multiple roles of parent, …

Letitia Carson In Court: African American Women, Property, And Wages In The Pacific Northwest, Stephanie Marie Vallance

Dissertations and Theses

Letitia Carson arrived in Oregon from Missouri in 1845, accompanied by David Carson and their newborn child, a daughter named Martha. The Carsons settled in the Soap Creek Valley and took advantage of Oregon's Provisional Government's donation land claim program, living on 640 acres in the newly formed Benton County with Martha and a second child, a son named Adam, born a few years after arriving in Oregon. Within ten years, however, David would be dead and Letitia would be dispossessed of all property and belongings. A former slave, Letitia had little social standing in the new territory and no …

Determinant Factors Of Bicyclist Injury Severity At Signalized And Unsignalized Intersections, Apy Das

Dissertations and Theses

Bicycling is becoming increasingly popular in Oregon and the US in general due to its environment friendliness as well as health benefits. With Oregon's population projected to increase by more than 30% over the next 30 years, improving the safety of the transportation network for persons on bicycles is important. In Oregon, majority of the bicyclist crashes occur at intersections. This thesis seeks to identify the determinant factors that significantly impact bicyclist crash injury severity at intersections. A mixed logit framework that accounts for any unobserved heterogeneity in the data and allows the estimated parameters to randomly vary across observations …

Investigating Values In Discourse: Ideals And Social Plans, Luke Edward Hanst

Dissertations and Theses

Social scientists argue that values enable group coordination. I explore two theories of values before turning to evidence provided by Amanda Gorman's inaugural poem, "The Hill We Climb." First, the paradigm of Shalom Schwartz describes values as transsituational goals which enable groups to coordinate action and evaluate the world. I argue the Schwartz paradigm zooms out from values into categories while I need a means to zoom in to understand values in discourse. I turn to the Pragmatic Prospection paradigm to elaborate the cognitive ontology of goals and to understand the function of language. I argue that values are shared …

From Mdp To Alphazero, David Robert Sewell

Dissertations and Theses

In this paper I will explain the AlphaGo family of algorithms starting from first principles and requiring little previous knowledge from the reader. The focus will be upon one of the more recent versions AlphaZero but I hope to explain the core principles that allowed these algorithms to be so successful. I will generally refer to AlphaZero as theses [sic] core set of principles and will make it clear when I am referring to a specific algorithm of the AlphaGo family. AlphaZero in short combines Monte Carlo Tree Search (MCTS) with Deep learning and self-play. We will see how these …

Japanese-English Code-Switching By Postwar Speakers In Contemporary America, Andre John Shepherd

Dissertations and Theses

In her examination of Japanese-English bilingualism in Toronto, Nishimura (1995b) demonstrated that second-generation Japanese-Canadians varied their speech dependent on the audience they were addressing. According to her, the Japanese-Canadians spoke primarily in English to fellow second-generation speakers, while maintaining conversations in Japanese with those who had spent their formative years in Japan. However, when addressing audiences composed of both groups, they switched back and forth evenly between the two languages.

Following research done by Woolard (1989) on the effects of societal influences on language, the state of the Japanese-Canadians can be related to the breakup of the ethnic enclaves in …

The Longitudinal Effects Of A Family And Sleep Supportive Intervention On Service Member Anger And Resilience, Shalene Joyce Allen

Dissertations and Theses

The vast majority of workplace intervention research on employee anger and resilience primarily focuses on individual-level strategies for mitigating employee anger and resilience outcomes in the workplace, with no studies having examined these outcomes with tangible occupational health interventions utilizing organizational-level techniques. Thus, the current study extends the literature on how to provide improvements in employee anger and resilience using higher system and organizational change mechanisms by providing evidence-based support for the effectiveness of a Total Worker Health® intervention, referred to as the Family and Sleep Supportive Intervention Training (FaSST). This approach employs both health protection and health promotion strategies …

God-Talk In Catholic High Schools: Theology Teachers Doing Theological Education For And With Religiously Diverse Student Populations, David Michael Avram Gregory

Dissertations and Theses

High school students deserve educations that honor and respect their cultural positionalities, of which religious beliefs are frequently an integral part. Almost 25% of students in Catholic high schools identify as non-Catholic, but the U.S. Catholic bishops have mandated that Catholic secondary theological education (through their 2008 Doctrinal Elements of a Curriculum Framework for the Development of Catechetical Materials for Young People of High School Age) be catechetical. In writing and promulgating this document, the bishops presupposed that Catholic schools' students are Catholic, or (should) desire to become Catholic. For decades, scholars have critiqued catechesis as an inappropriate mode …

The Discourse/Pragmatic Functions Of Japanese Okkē, Peter Fodor

Dissertations and Theses

Okay is one of the most commonly used words in the English language. It is also one of the most commonly borrowed English-origin loanwords across all of the world's languages. Although there is a wealth of research on the communicative functions of English okay, there is comparatively little research on the many borrowings of the word in various other languages. In order to address this gap in the literature, this study explores the differences in discourse/pragmatic function between the English word okay, and the Japanese borrowing of the word, okkē.

Extensive research in discourse analysis, pragmatics, and …

What Does It Mean To Be Deaf? Changing Meanings Of Deafness, Communication Technology, And Beliefs About Normality In The Us, Kathryn Elizabeth Burrows

Dissertations and Theses

How deafness is perceived as a problem by society dictates what types of technologies are leveraged to address the problem, and, conversely, available technologies shape how deafness is perceived. In this dissertation, I draw on multiple methods to explore the meanings of deafness in the US since the early 18^th century to the present, examine how the meanings of deafness in those eras shaped deaf technology, and assess how available technologies shaped how deafness was understood. Using primary and secondary historical sources, I identify that every era identifies a different "problem of being deaf" and it is that problem …

Guarding Against Strain: The Moderating Role Of Nonwork Experiences In The Relationship Between Work-Related Hypervigilance And Strain In Correctional Officers, Samantha Getzen

Dissertations and Theses

Correctional officers (COs) are expected to remain alert in order to maintain safety within the potentially hostile prison environment. As a result, COs experience high levels of work-related hypervigilance (WHV), which has been associated with negative health and wellbeing outcomes for COs. This study examines nonwork experiences as potential boundary conditions for the relationship between WHV and strain outcomes. It was hypothesized that nonwork experiences (psychological detachment, relaxation, mastery experiences, and exercise) would weaken the relationship between WHV and strain outcomes (emotional exhaustion, physical symptoms and impaired sleep). Data were analyzed from 166 COs in Oregon. A series of hierarchical …

Improving Bicycle Crossings At Unsignalized Intersections Through Pavement Markings: Analysis Of The City Of Portland Innovative Strategy, Frank Boateng Appiah

Dissertations and Theses

The increasing trend in the number of bicycle crashes in the U.S since 2009 has been a major challenge to safety. In 2019, a total of 36,096 people were killed on U.S roadways. A total of 846 (2.3%) of these fatalities were bicyclists and around 75% of the bicycle fatalities occur in urban areas and intersections are common locations of crashes. Many bicycle enhancements such as bike boxes, bicycle signals, curb extensions have been installed to improve safety at signalized intersections. The City of Portland OR experimented with an innovative treatment to improve bicycle crossings at unsignalized crossings. This treatment, …

Building A Biomechanical Model Of A Rat Forelimb, Joshua Nathaniel Eric Mak

Dissertations and Theses

This paper presents a biomechanical model of the rat forelimb to test theories of determining viscoelastic muscle parameters. Several biomechanical models of rat hindlimbs have been developed and have explored the effects of multi-muscle control during locomotion. The forelimb model uses two ball-and-socket joints to model clavicle and scapula movement. A third ball-and-socket joint is used at the shoulder and two hinge joints are used at the elbow and wrist. Scapula motion is further constrained by muscle and spring elements. Each forelimb has 11 degrees of freedom, and 23 Hill-type muscles. The model has been created in Animatlab, which includes …

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 …

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, …

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 …

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 …

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 …

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 …

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 …

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 …