Digital Commons Network^™

Human-Centered Design Of An Air Quality Feedback System To Promote Healthy Cooking, Chantal Iribagiza

Dissertations and Theses

Household air pollution (HAP) is responsible for almost 4 million premature deaths every year, a burden that is primarily carried by women and children in developing countries. The mortality and morbidity impact of HAP can be significantly alleviated through clean cookstove interventions. However, for these interventions to be effective, the new intervention stove must be a substantially cleaner technology and adoption should be high and sustained over time.

Woody biomass is the fuel of choice in many developing communities, and contributes substantially to HAP. Several organizations have launched clean cooking interventions to address this issue. However, the majority of those …

Dynamics Of Magma Recharge And Mixing At Mount Hood Volcano, Oregon -- Insights From Enclave-Bearing Lavas, Molly Kathryn Ellowitz

Dissertations and Theses

Magma recharge events and subsequent mixing processes are understood to precede volcanic eruptions. Textural evidence of intrusion of hot, mafic magma into a cooler, rheologically locked silicic magma is commonplace. Solidified "blobs" of injected magma, called enclaves, are evidence of magma mixing, but the petrological and mechanical conditions during their formation are debated. Mount Hood, Oregon consistently erupts andesite bearing compositionally similar enclaves. These enclaves are evidence of mingling and mixing of two magmas. However, due to the compositional similarity between enclave and host lava (e.g. ~1-5 wt.% difference in SiO₂), it is unclear whether the preserved enclaves …

Reliability Of Solder Joints In Embedded Packages Using Finite Element Methods, Valeri Aisha Yunusa

Dissertations and Theses

Solder joints serve as both mechanical and electrical connections between elements in a package. They are subjected to shear strains generated as a result of the different behaviors of the elements in the package (tension and compression) due to the differences in coefficients of thermal expansion during service conditions.

Some of the causes of solder joint failures are due to the following:

Vibration: small rapid displacements of parts of the assembly. This is not necessarily an issue with electronic components but larger parts like automobiles.

Humidity: the package being exposed to water or ionic species can undergo corrosion if an …

Bertolt Brecht's Leben Des Galilei: A Mythic Dimension In Epic Theatre, Yashowanto Narayan Ghosh

Dissertations and Theses

The history of Bertolt Brecht's play Leben des Galilei extends through the writing of its three versions during 1938 to 1955 -- a period of two decades that also encompassed the entirety of the Second World War. The period also covers the atom bomb from its development to America's use of the bomb in Hiroshima and Nagasaki, as well as the beginning of the Cold War, which included the sustained threat that nuclear weapons might be used any day. This thesis traces, and offers interpretations of, changes in Brecht's Leben des Galilei from its inception in 1938-1939 -- when the …

Bystander Intervention To Prevent Campus Sexual Violence: The Role Of Sense Of Community, Peer Norms, And Administrative Responding, Erin Christine Mcconnell

Dissertations and Theses

In recent years, the use of bystander intervention training to address campus sexual violence has risen rapidly. More research is critically needed to guide the ongoing development and implementation of prevention efforts by campuses utilizing this relatively new approach. This investigation examined associations between college students' bystander intervention behavior and three key factors: (1) perceived peer norms supportive of sexual violence; (2) perceived campus administrative response to sexual violence; and (3) sense of campus community. Data from a sample of 2370 college students was analyzed using hierarchical linear regression to test both direct and moderated effects. Findings revealed that both …

Environmental Justice In Natural Disaster Mitigation Policy And Planning: A Case Study Of Flood Risk Management In Johnson Creek, Portland, Oregon, Seong Yun Cho

Dissertations and Theses

This study aims to explore the possibility of environmental justice as social consensus and an institutional framework to reduce socioeconomic differences in natural disaster vulnerability through a case study of flood risk management in Johnson Creek, Portland, Oregon. First, by analyzing institutions, policies, and currently ongoing flood mitigation projects, this study investigates how federal and local governments are addressing and responding to current flood problems. Second, through flood expert surveys and GIS spatial analysis, this study examines various factors that contribute to communities' susceptibility to flood risks, and whether there exist spatial differences between physically and socioeconomically vulnerable communities within …

White Space, Black Space: Community Gardens In Portland, Oregon, David Ross Billings Jr.

Dissertations and Theses

Community gardens have been the focus of social science research in the United States for several decades and the benefits associated with these alternative food spaces has been well documented. More recently, scholars have begun to argue that these benefits are inequitably distributed across society. Largely as a result of the whiteness of these spaces, people of color are less represented in community and benefit less from their presence. Portland, Oregon is recognized as a leader in sustainability, with its abundance of community gardens and urban agriculture. It is also one of the whitest urban cities in the United States. …

Grammatical Errors By Arabic Esl Students: An Investigation Of L1 Transfer Through Error Analysis, Aisha Saud Alasfour

Dissertations and Theses

This study investigated the effect of first language (L1) transfer on Arabic ESL learners' acquisition of the relative clauses, the passive voice and the definite article. I used Contrastive Analysis (CA) and Error Analysis (EA) to analyze 50 papers written by Arabic ESL students at the ACTFL Advanced Mid proficiency level. The analysis was paired with interviews with five advanced students to help determine whether L1 transfer was, in fact, influencing students' errors predicted by CA.

Students in this study made L1 errors along with other errors. Although no statistical difference was found between the frequency of transfer and other …

Gendered Partner-Ideals, Relationship Satisfaction, And Intimate Partner Violence, Sylvia Marie Ferguson Kidder

Dissertations and Theses

This dissertation identified and developed indicators of a new potential predictor of relationship satisfaction and intimate partner violence (IPV): discrepancies between the ideal and perceived gendered characteristics of romantic partners. Past research has overlooked the implicitly gendered nature of these "partner-ideals." Two pilot studies were conducted to develop measures of gendered partner-ideals and -perceptions based on existing measures of gender ideology.

The main study examined survey data collected online from adults (n = 643) living in the U.S. who were in a heterosexual romantic relationship for at least six months. Three main hypotheses were tested regarding the associations among gender …

The Intersections Of Good Intentions, Criminality, And Anti-Carceral Feminist Logic: A Qualitative Study That Explores Sex Trades Content In Social Work Education, Meg Rose Panichelli

Dissertations and Theses

This study uses anti-carceral feminist logic to explore the cultural meanings, criminal implications, and neoliberal influence that shape the landscape of social work education about the sex trades in the United States and transnationally. "What are social work instructors teaching students about the sex trades in coursework?" is the question that directs the study, which uses a feminist qualitative methodology inclusive of intersectional feminist epistemology as well as direct content analysis. To answer this question, I analyzed 20 social work course syllabi from sex trade related courses across the contiguous United States and interviewed 20 social work instructors from 14 …

A Foucaultian Discourse Analysis Of Person-Centered Practice Using A Genealogical Framework Of Intellectual Disability, Nick Winges-Yanez

Dissertations and Theses

A genealogical framework highlights the important role sexuality has played in constructing the current label of intellectual disability (ID). The genealogical framework is meant to replace the social, medical, and/or rights-based model(s) that have dominated social work and social services working in the disability field. With this framework, or perspective, I use a Foucaultian discourse analysis to read through seminal texts regarding person-centered practice.

Person-centered practice is the foremost intervention used in social work, and other disciplines, to work with people labeled with intellectual disability. My research questions focus on what is revealed about ID in PCP through a genealogical …

Cyclists' Queue Discharge Characteristics At Signalized Intersections, Kirk Thomas Paulsen

Dissertations and Theses

Wider bike facilities intuitively accommodate a greater number of cyclists in the same amount of time, but specific queue discharge characteristics associated with varying widths and/or types of bike facilities have not been thoroughly documented.

The focus of this research analyzed queues of cyclists at four signalized intersections in Portland, OR with varying widths on the approach and downstream intersection legs. A total of 2,820 cyclists within 630 groups of queued cyclists were observed at five different intersection layouts in Portland, Oregon. The layouts consisted of: a standard bike lane six feet wide connecting bicyclists to a standard bike lane …

Intrapersonal And Social-Contextual Factors Related To Psychological Well-Being Among Youth Experiencing Homelessness, Katricia Stewart

Dissertations and Theses

Homeless youth are typically defined as a group of adolescents and young adults (ages 12-24) who do not have stable dwellings, but instead live on the streets, in shelters or abandoned buildings, or in other unstable situations (e.g., doubling up with friends). Given the myriad of hardships, stressors, and marginalization faced by youth as they navigate life on the streets, it is encouraging that researchers have begun examining well-being among youth experiencing homelessness. However, the few studies examining well-being among homeless youth have produced inconsistent results. Furthermore, little is known about the components of well-being that are both relevant to …

Between A Rock And A Hot Place: Economic Development And Climate Change Adaptation In Vietnam, Khanh Katherine Pham

Dissertations and Theses

This thesis explores 1) the ways that three Vietnamese infrastructure development projects undermine their cities' climate change adaptation goals and 2) the political and economic forces driving these developments. In-depth interviews highlight four main perspectives of planners and decision makers, which explain why these infrastructure projects often undermine cities' climate resilience goals. I describe how the mainstream climate change adaptation planning approach, with its emphasis on participatory planning, good governance and green growth, implicitly reinforces the neoliberal growth model, even as it seeks to ameliorate the inequality and ecological destruction that such a growth model creates. My research reveals how …

Computer-Based Instruction As A Form Of Differentiated Instruction In A Traditional, Teacher-Led, Low-Income, High School Biology Classroom, Cheryl Casey

Dissertations and Theses

In 2015 the U.S. continues to struggle with academic achievement in public schools. Average test scores from 15 year olds taking the Program for International Student Assessment placed the U.S. as 38th out of 71 countries (Drew Devlin, 2017). It is common to discuss elimination of the achievement gap as the single most effective way to improve the U.S.'s mediocre standing among the highest scoring countries in the world in primary and secondary student test scores (McGhee,2004; Flemming 2012). In the broadest sense of the term the "achievement gap" refers to the difference in academic success between different groups of …

Effectiveness Of Pollinator Enhancements In Portland Community Orchards, Jess Alan Tyler

Dissertations and Theses

In urban areas, residential and community gardens are potential floral resources for pollinators. Pollinator "friendly" gardens are a popular way to support this ecosystem service, but the pollinator plant list recommendations lack empirical evidence to show which plants are most attractive to potential pollinators. This project used a community science survey based on a morpho-species protocol to monitor five community orchards in Portland, Oregon during six months of the growing season in 2017. Overall, orchards with higher floral species richness supported higher richness and abundance of pollinators, but the pollinator communities were not significantly different among the orchard sites. Orchard …

Adoption Of An Internet Of Things Framework For Distributed Energy Resource Coordination And Control, Tylor Slay

Dissertations and Theses

Increasing penetration of non-dispatchable renewable energy resources and greater peak power demand present growing challenges to Bulk Power System (BPS) reliability and resilience. This research investigates the use of an Internet of Things (IoT) framework for large scale Distributed Energy Resource (DER) aggregation and control to reduce energy imbalance caused by stochastic renewable generation. The aggregator developed for this research is Distributed Energy Resource Aggregation System (DERAS). DERAS comprises two AllJoyn applications written in C++. The first application is the Energy Management System (EMS), which aggregates, emulates, and controls connected DERs. The second application is the Distributed Management System (DMS), …

Stance-Taking: Jfl Learners And Benefactive Verbs, Kumiko Takizawa

Dissertations and Theses

This study explores how JFL learners take a benefactive stance in Japanese. As Jaffe (2009) observes, stance-taking "plays a complex role with respect to the naturalization of social and linguistic ideologies and the social structures they legitimate." The way in which language is used to take a stance always concerns the social context in which a speaker finds her/himself. In Japanese, benefactive verbs (kureru, ageru, morau and their honorific and humble equivalents) are indispensable stance indicators for showing gratitude or indebtedness. Such expressions do not really exist in English and their grammar is complex. It is assumed that JFL learners …

Finding Common Ground: Relationship Building And Communication Between Po And Client Within A Community Supervision Setting, Carl Eugene Appleton

Dissertations and Theses

Previous research on the community supervision model entitled Effective Practices in Community Supervision (EPICS) focuses on the increased attention trained probation officers (POs), as opposed to non-trained POs, pay to using core correctional practices (Smith et al. 2012). While studies like this present a picture of what POs do during face-to-face interactions, there is little focus on PO perceptions of these day-to-day practices. Furthermore, still less studies center the clients on supervision in order to better understand topics such as ideal PO, ideal relationship, and perceptions of common community supervision strategies. To address these gaps, this study uses 30 semi-structured …

Assessment Of Seismic Retrofit Prioritization Methodology For Oregon's Highway Bridges Based On The Vulnerability Of Highway Segments, Selamawit Tesfayesus Mehary

Dissertations and Theses

Geologists have indicated that the question is not if a catastrophic earthquake will occur in Oregon but when one will occur. Scientists estimate that there is close to 40 percent conditional probability that a Cascadia subduction zone earthquake of magnitude 8.0 or above will strike Oregon in the next 50 years. In addition, the majority of Oregon's bridge inventory was built prior to the current understanding of bridge response and prior to current understanding of the expected earthquake demands. In order to minimize potential bridge damage in the case of an earthquake, one approach is to retrofit seismically deficient bridges. …

Investigation Of The Acoustic Response Of A Confined Mesoscopic Water Film Utilizing A Combined Atomic Force Microscope And Shear Force Microscope Technique, Monte Allen Kozell

Dissertations and Theses

An atomic force microscopy beam-like cantilever is combined with an electrical tuning fork to form a shear force probe that is capable of generating an acoustic response from the mesoscopic water layer under ambient conditions while simultaneously monitoring force applied in the normal direction and the electrical response of the tuning fork shear force probe. Two shear force probes were designed and fabricated. A gallium ion beam was used to deposit carbon as a probe material. The carbon probe material was characterized using energy dispersive x-ray spectroscopy and scanning transmission electron microscopy. The probes were experimentally validated by demonstrating the …

Insufficient Effort Responding On Mturk Surveys: Evidence-Based Quality Control For Organizational Research, Lee Cyr

Dissertations and Theses

Each year, crowdsourcing organizational research grows increasingly popular. However, this source of sampling receives much scrutiny focused on data quality and related research methods. Specific to the present research, survey attentiveness poses a unique dilemma. Research on updated conceptualizations of attentiveness--insufficient effort responding (IER)--shows that it carries substantial concerns for data quality beyond random noise, which further warrants deleting inattentive participants. However, personal characteristics predict IER, so deleting data may cause sampling bias. Therefore, preventing IER becomes paramount, but research seems to ignore whether IER prevention itself may create systematic error. This study examines the detection and prevention of IER …

An Assessment Of Sentencing Disparities Among American Indians Within The Eighth, Ninth, And Tenth Federal Circuit Courts, Makenzie Laron Aaby

Dissertations and Theses

Assessing the effect of race on crime is an important topic of criminology and criminal justice research. Prior investigations have sought to uncover if racial disparities exist within certain aspects of the criminal justice system, such as arrests, trials, and sentencing. The existing scholarship, however, has largely focused on assessing differences between Black and Hispanic offenders in relation to White offenders. There has been little academic exploration to examine if racial disparities exist among American Indian offenders during criminal justice processing. To address this gap in knowledge, this study analyzes data collected from the United States Sentencing Commission to assess …

Utilitarian Skateboarding: Insight Into An Emergent Mode Of Mobility, Michael Joseph Harpool

Dissertations and Theses

In recent years research and planning efforts to enhance the conditions and opportunities for active transportation modes have increased significantly; however, these efforts have primarily focused on pedestrians and bicyclists. Skateboarding and other alternative modes of mobility remain an untapped potential for healthy and sustainable travel. This research addresses numerous knowledge gaps in the literature on utilitarian skateboarding under the larger umbrella of active transportation. Analysis of online survey results and semi-structured interviews with skateboarders in Portland, OR provides insight into the motivations and barriers of traveling by skateboard and the demographics and perceptions of skateboard commuters. Like bicyclists and …

Emulating Balance Control Observed In Human Test Subjects With A Neural Network, Wade William Hilts

Dissertations and Theses

Human balance control is a complex feedback system that must be adaptable and robust in an infinitely varying external environment. It is probable that there are many concurrent control loops occurring in the central nervous system that achieve stability for a variety of postural perturbations. Though many engineering models of human balance control have been tested, no models of how these controllers might operate within the nervous system have yet been developed. We have focused on building a model of a proprioceptive feedback loop with simulated neurons. The proprioceptive referenced portion of human balance control has been successfully modeled by …

Politics In The Social Media Era: The Relationship Between Social Media Use And Political Participation During The 2016 United States Presidential Election, Kevin Everett Curry

Dissertations and Theses

The growth of social media use raises significant questions related to political information and its effect on political knowledge and participation. One issue is whether social media delivers news and political information in a similar manner as traditional news media sources, like newspapers, TV, and radio, by contributing to political knowledge, which is linked to voter turnout. This dissertation examines the relationship between an individual's social media use, their use of traditional news media sources, and whether they turn out to vote. It utilizes American National Election Survey data from the 2016 U.S. Presidential election to complete three studies. First, …

Principal And Teacher Beliefs About The Impact Of Cbas On School Performance: Five High Performing High Schools In Oregon, Kevin Jon Ricker

Dissertations and Theses

This qualitative study examined how school leaders work within the structure of individual district collective bargaining agreements to improve student achievement. The study examines real or perceived barriers to improving student achievement within educational organizations from the perspective of the principals and teacher-leaders.

This study included two qualitative instruments, one for building principals and one for the building teachers, administered in five Oregon high schools recognized as successful by the Oregon Department of Education in 2014-2015. This dissertation determined the impact collective bargaining agreements had on the ability of high school principals to reduce educational disparities and close the achievement …

"Tindersluts" & "Tinderellas:" Examining Young Women's Construction And Negotiation Of Modern Sexual Scripts Within A Digital Hookup Culture, Mackenzie A. Christensen

Dissertations and Theses

While a growing body of literature exists examining how intersecting social identities and structural organizations shape the on-campus hookup script, research examining the impact of technology on the hookup culture has been virtually nonexistent. Addressing this gap, this study adds to a current body of literature on the hookup culture and online dating by exploring how a diverse sample of young women and non-binary, femme individuals understand and negotiate interpersonal sexual scripts through the mobile dating app Tinder. Ultimately, findings from 25 in-depth interviews reveal how Tinder has shaped the sexual scripts of young adult dating into a "hybrid hookup …

Neighbor Perceptions Of Psychiatric Supportive Housing : The Role Of Knowledge, Attitudes, And Behaviors, Amy Leigh Shearer

Dissertations and Theses

Purpose: Historically, communities have opposed the development of residential programs for adults with psychiatric disabilities. In the last two decades, national and local campaigns have made targeted efforts to improve public knowledge about mental illness, and attitudes and behaviors towards mental health clients. Supportive housing policies have also been revised to better facilitate integration and independence for clients with psychiatric disabilities. Despite these changes, the number of studies on perceptions of psychiatric supportive housing has dramatically declined in recent years. Little is known about how neighbors currently perceive psychiatric housing and neighbors with mental illness, or the role that mental …

Who Am I? Criminal Social Identity As A Mediator In The Relationship Between Criminal Peers And Criminal Attitudes Within A Sample Of Probationers/Parolees, Quinton Thomas Alexander

Dissertations and Theses

Previous research has shown there to be a relationship between criminal peers and an individual's antisocial behavior and attitudes. Social literature lacks however empirical support for social identity theory, which suggests social identity serves as a mediator in the development of attitudes. Rather than a direct relationship where criminal peers influences the presence of criminal attitudes, this research suggests that criminal peers actually influences a mediator (i.e. an individual's social identity), which in turn influences their criminal attitudes. Thus, this mediation serves to clarify the nature of the seemingly apparent relationship between peers and attitudes. The current study, then, attempts …