Digital Commons Network^™

A Seasonal Study Of Ecoroof Metal And Nutrient Dynamics And Associated Drivers In An Ecoroof On A Commercial Building In North Portland Oregon, Alex Vijay Bans

Dissertations and Theses

Green stormwater infrastructure (GSI), specifically ecoroofs, is increasingly seen as an effective stormwater management tool in urban planning strategies. However, the literature suggests that ecoroofs can be sources of certain metals and nutrients. The goal of our study was to address two research questions: 1) How does ecoroof runoff compare to conventional roof runoff chemically: do ecoroofs retain certain chemicals and leach others? and 2) what are the roof characteristics and environmental variables that affect runoff quality? For 10 months, runoff events from an ecoroof were compared to those of a conventional roof; water samples were collected with autosamplers, and …

Hiv Viral Suppression Among Hiv Positive Women Of Color In The United States, Amanda J. Nace

Dissertations and Theses

Background: As of 2020, human immunodeficiency virus (HIV) and acquired immunodeficiency syndrome (AIDS) remains a serious public health problem in the United States (U.S.). There are more than 1.1 million people living with HIV/AIDS (PLHIV) in the U.S. in 2020. While HIV predominately affects men in the U.S., women are less likely to achieve viral suppression than men. Among the women living with HIV, women of color (WOC) have borne a disproportionate burden of the HIV epidemic in the U.S. for decades. A wealth of evidence has demonstrated the importance of viral suppression as a tool for controlling the …

Outsiders Within Inequality Regimes: A Sociological Framework To Advance The Lives Of Women Veterans, Sarah Louise Aktepy

Dissertations and Theses

This three-paper dissertation examines pervasive gender inequalities across two institutions: the US military and Department of Veterans Affairs (VA). The first paper, "'Don't Rock the Boat:' Experiences and Perceptions of Gender-Based Violence in the U.S. Military" uses qualitative interviews to better understand the experiences of gendered harassment and violence of women veterans in the US military. The second paper, "First Do No Harm: Assessing Veterans Affairs Screening for Military Sexual Abuse among our Nations Veterans" uses survey data and qualitative interviews to identify factors that contribute to inaccurate results of clinical screening for veterans with military sexual violence histories within …

Social Media Use, Social Comparison, And Loneliness, Jordan Elena Johnson

Dissertations and Theses

Since its invention, the use of Instagram and its psychological effect on users has been a topic of conversation for researchers. To achieve a better understanding of Instagram's effect on loneliness, it's important to isolate different behaviors on Instagram because of its different attributes as a social media app. Drawing on literature on the emotional effects of social media use and social comparison orientation (SCO), this study takes a closer look at specific Instagram behaviors: broadcasting, interacting, and browsing as well as SCO's relationship with loneliness. A total of 147 undergraduate students attending a university in the Pacific Northwest completed …

Comparing The Promise And Reality Of E-Scooters: A Critical Assessment Of Equity Improvements And Mode-Shift, Michael Glenn Mcqueen

Dissertations and Theses

In just three years, e-scooters have substantially disrupted and altered the urban mobility landscape. Throughout this period, they have been commonly touted as part of a larger micromobility solution that promises to erase equity barriers and solve the first-mile/last-mile problem. However, few studies in the nascent e-scooter literature have considered these claims. In this study, we surveyed students at Portland State University (n = 1,968) about the role that e-scooters, among other modes, played in meeting their general and university-related travel needs. We then estimated models that incorporated demographics, travel behavior, and latent attitudes distilled using exploratory factor analysis (EFA). …

Theoretical And Experimental Validation Of A Cubesat's L-Band Communication System, Evangelos Mastrogiannis

Dissertations and Theses

An L-band uplink communication system was designed and validated in the lab for a CubeSat satellite operating in low Earth orbit (LEO). This paper investigates communication link analysis, discusses the design strategy for an inexpensive CubeSat receiver operating in L-band with a moderate power Earth station transmitter, and validates the link budget with prototype hardware using an anechoic chamber.

A receiver's required carrier-to-noise ratio (CNR) establishes the basis for a link budget. The requirement for a digital communication link is set by the bit-error-rate (BER) requirement of a chosen communication protocol which is inversely related to the energy per bit …

A Scoring Model To Evaluate Offshore Oil Projects: Case Of Eni And Mellitah Oil & Gas, Abdulhakim Giadedi

Dissertations and Theses

Offshore oil projects have many different and unique characteristics, such as larger project size, higher number of scopes, and higher complexity. In fact, offshore oil projects described as mega projects are ones that require significant assessment and acquisition methods in order to reduce risks and failures. Traditionally, cash flow analysis and return on investment are the most known factors to evaluate offshore oil projects. However, there are several other internal and external factors that affect the overall performance of offshore oil projects. A comprehensive approach and advanced tools are required to evaluate these factors that can have a significant impact …

Analog Statistical Design For Manufacturability, Yu-Shan Wang

Dissertations and Theses

The manufacturing yield, overkill, and defect level limit the feasibility of analog circuits in SoCs. The conventional method of handling process and environmental variation is to assign a design margin such that the design meets specifications at several processes and environmental corners. However, checking only extreme corners limits performance in comparison to the more rigorous statistical approach of the computing manufacturing and quality figure of merit. The statistical approach requires transistor-level simulation of hundreds or even thousands of samples, not just a few corners, and thus is very time consuming.

This research offers a method for reducing the time required …

Understanding Evangelical Support For, And Opposition To Donald Trump In The 2016 Presidential Election, Joseph Thomas Zichterman

Dissertations and Theses

This thesis addressed the conundrum that 81 percent of evangelicals supported Donald Trump in the 2016 presidential election, despite the fact that his character and comportment commonly did not exemplify the values and ideals that they professed. This was particularly perplexing to many outside (and within) evangelical circles, because as leaders of America's "Moral Majority" for almost four decades, prior to Trump's campaign, evangelicals had insisted that only candidates who set a high standard for personal integrity and civic decency, were qualified to serve as president.

In order to deal with this problem, I conducted a qualitative study, which followed …

An Examination Of Hiv Risk, Testing And Prevention Intervention Participation Among Vulnerable Youth, Bianca V. Lopez

Dissertations and Theses

Background: Young gay, bisexual and other men who have sex with men (YGBM) of color are disproportionately affected by HIV and bear the burden of the disease in the United States. Gay and bisexual men – referred to in surveillance systems as men who have sex with men (MSM) – continue to be the risk group most severely affected by HIV in the United States. The dissertation study explored factors related on HIV prevention intervention participation, HIV testing and sexual risk behaviors among YGBM ages 13-29 in the Bronx. Additionally, this dissertation endeavored to study the concept of “intervention fatigue”, …

The Almohad: The Rise And Fall Of The Strangers, David Michael Olsen

Dissertations and Theses

The Almohad (1120-1269) displaced the Almoravid dynasty (1040-1147) as the rulers of the Maghreb and Andalusia in 1147 and created the largest Berber kingdom in history. They conquered the first indigenous rulers of the Maghreb by aggregating the Masmuda tribes from the High Atlas Mountains and enlisting the Zenata and Arab tribes from the Northern Maghreb. The Almohad rule built upon the existing Almoravid infrastructure; however, their cultural, administrative, and military approach entailed a more integrated tribal organization, centralized authority, and an original Islamic ideology. In creating this empire they envisioned the Maghreb as a consolidated political center and not …

Trailblazing Transformation: Pioneering Transformative Peacebuilding In Academic Labor Conflicts, Sam Frazier Hediger

Dissertations and Theses

Unionized contingent faculty in the United States face an increasingly difficult economic landscape in their labor-management conflicts with university administrations. These unions, comprised of graduate student employees and adjunct instructors, won significant victories for their members but have failed to shift the broader patterns of casualization, unsustainable compensation, and job precarity, stemming from the systemic debasement of higher education institutions and the American labor movement, both of which pose significant challenges to conventional conflict resolution strategies. To find a path forward, this thesis explores the nature and possibility of transforming of the academic labor conflict, using a transformative peacebuilding approach …

Designing A More Effective Mri Contrast Agent: Investigation Into Various Functionalization Strategies For Targeted Imaging, Lauren Nicole Rust

Dissertations and Theses

Magnetic resonance imaging (MRI) is a medical imaging technique that provides high-resolution images used for diagnostic medicine while maintaining a superior safety profile compared to other radiative techniques. The administration of gadolinium-based contrast agents (GBCAs) improves the diagnostic power of MRI and have been used clinically for over three decades. Although GBCAs are effective at improving the contrast in the image, their detection limits are high and require a large dose to generate an observable effect. This high dose is the consequence of the current available designs of clinical GBCAs; their structures are not tuned to generate optimal efficacy. Efficacy …

Impact Of 2012 Spanish Health Care Reform On Hiv-Positive Immigrants: A Mixed Methods Approach, Megi Gogishvili

Dissertations and Theses

Background: The financial crisis of 2008 hit Spain hard. As a consequence, the government took multiple austerity measures, including reforms in the healthcare system in 2012. Specifically, the government reduced the budget for health and social services by 13.7% in 2012.The reduction was further followed with structural changes via the 2012 Royal Decree Law (RDL) and Royal Decree (RD).The 2012 RDL and RD entailed broad areas of action,but most importantly the Spanish National Health System (SNS) no longer covered undocumented immigrants. The 2012 RDL and RD excluded approximately 500,000 undocumented immigrants from SNS.

The number of immigrants in Spain has …

Archaeologists, The Public, And Collectors: Establishing A Regional Database Of Archaeological Sites On Private Land And Collections With A Process For Professional-Public Archaeological Research In The Portland, Oregon Area, Katherine Louise Tipton

Dissertations and Theses

Over the course of daily life, people engage with archaeology in various ways, including experiences with archaeology on their own land and as part of family collections of archaeological material. As a result, members of the public often hold considerable archaeological knowledge that professionals have historically overlooked. Recent scholarship focuses on the issue of incorporating the public and collectors into archaeological research and ways for capturing that information. Professional-public collaboration is particularly important in the Portland, Oregon area, where many archaeological sites are located on private land and there is a long history of collecting.

The goal of this thesis …

Distribution, Geochronology, And Petrogenesis Of The Picture Gorge Basalt With Special Focus On Petrological Relationships To The Main Columbia River Basalt Group, Emily Bogdan Cahoon

Dissertations and Theses

The Columbia River Basalt Group (CRBG) is the youngest and volumetrically smallest continental flood basalt exposed across the Pacific Northwest, USA. Similar to other large igneous provinces, the majority of material erupted during the initial 1 million years of activity, these lavas are subdivided into four main-phase units. The Picture Gorge Basalt (PGB) is the only main-phase unit of the CRBG whose age is not precisely known and understanding of PGB petrogenesis is largely based on a limited number of samples when compared with other main-phase units. It is suggested that a time gap of over 0.5 myr existed between …

Catholic Social Teaching And Sustainable Development: What The Church Provides For Specialists, Anthony Philip Stine

Dissertations and Theses

The principles of Catholic Social Teaching as represented by the writings of 150 years of popes as well as the theorists inspired by those writings are examined, as well as the two principal schools of thought in the sustainability literature as represented by what is classically called the anthropocentric or managerial approach to sustainability as well as the biocentric school of thought.

This study extends previous research by analyzing what the Catholic Church has said over the course of centuries on issues related to society, economics, and the environment, as embodied in the core concepts of subsidiarity, solidarity, stewardship, the …

Dynamic Through-Silicon Via Clustering In 3d Ic Floorplanning For Early Performance Optimization, Sucheta Mohapatra

Dissertations and Theses

Through-silicon via (TSV)-based three-dimensional integrated circuits (3D ICs) are expected to be the breakthrough technology for keeping up with the scaling trends of Moore's law, while also offering the unique opportunity for functional diversification through heterogenous integration. TSVs are vertical metal interconnects enabling communication across stacked and thinned dies. The dramatic reduction in global wirelength and chip footprint in 3DICs, directly improves delay, device density, bandwidth and routing congestion. Even with the current maturation of TSV process, the roadmap for industry adoption of 3DICs remains largely uncertain due to lack of standardized 3D tools capable of handling the sheer complexity …

A Land Of Poets And Warriors: The Connection Between Warrior Culture And Bardic Culture In Medieval Wales C. 1066-1283, Sarah Lynn Alderson

Dissertations and Theses

Wales in the Middle Ages was a region both divided by war and united by culture. Frequent raids from the Hiberno-Irish, Scandinavians, and Flemish threatened Wales from the outside, while the kings within the borders of Wales fought for supremacy. During the late eleventh century, William the Conqueror made his way to the Welsh border in an attempt to secure his fledging kingdom. Under the premise of protecting his borders, William established the first March of Wales on the eastern border of Wales in 1087. This started the slow process of Anglo-Norman expansion and colonization into Wales.

The Welsh maintained …

Battle Of The Buttercups: Investigating Hybrid Zone Dynamics In A Ranunculus Species Complex, Jessica Persinger

Dissertations and Theses

Plants pose a well-known challenge to the biological species concept because hybridization is a common occurrence. Range dynamics have a crucial role in determining whether species are given the opportunity to interbreed or not. Successful hybridization can be of particular concern when considering range-limited species and their persistence. In my thesis research, I examine the apparent hybrid zone between the southern Oregon endemic Ranunculus austro-oreganus, a candidate threatened species due to its limited range, and its widespread congener, Ranunculus occidentalis, whose range spans from California to Alaska. The discovered contact zone was recognized in populations which contained apparent …

The Experiences Of Teachers Successfully Teaching Reading To Black Students, Kevin Michael Walker

Dissertations and Theses

Racist laws and subsequent educational policies and practices have resulted in schools in the United States failing to teach Black students reading. Historically, a racial achievement gap in elementary reading has existed throughout the history of the United States and has persisted to current times. As the population of students of color increases in the United States, we must investigate how teachers create equitable educational outcomes for students who have been historically underserved and oppressed by our education system. Teachers who are successful in ensuring our Black students have the opportunity to experience success in reading are actively disrupting the …

Novel View Synthesis - A Neural Network Approach, Hoang Le

Dissertations and Theses

Novel view synthesis is an important research problem in computer vision and computational photography. It enables a wide range of applications including re-cinematography, video enhancement, virtual reality, etc. These algorithms leverage a pre-acquired set of images taken from a set of viewpoints to synthesize another image at a novel viewpoint as if it was captured by a real camera. To synthesize a high-quality novel view, these algorithms often assume a static scene, or the images were captured synchronously. However, the scenes in practice are often dynamic, and taking a dense set of images of these scenes at the same moment …

Synthesis And Assessment Of Radiotherapy-Enhancing Nanoparticles, Hayden Winter

Dissertations and Theses

Radiation Therapy (RT) is a common treatment for cancerous lesions that acts by ionizing matter in the affected tissue, causing cell death. The disadvantage of RT is that it is most often delivered via an external beam of radiation which must pass through healthy tissues to reach the target site, ionizing matter within healthy tissues as well. To address this drawback, techniques are being developed for increasing RT-induced cell death in a target tissue while minimizing cell death in surrounding tissues. This effect is known as radiation dose enhancement or RT enhancement.

The approach to RT enhancement studied in this …

Assessing Well-Being Of Asian Elephants (Elephas Maximus) Through Major Events And Transitions, With Development And Aging, And Husbandry Changes, Sharon Stuart Glaeser

Dissertations and Theses

In this body of research, reproductive and adrenal hormones and behavior were used to evaluate individual and group responses to physiological, social, and environmental changes in zoo-housed Asian elephants, considering factors of sex, age, and life stage. Animals experience physiological, social, and environmental changes as part of their natural history and individual life experience. Measures of both positive and negative states are needed to assess the impact of these changes at the individual and group level. Such measures can help us better understand how animals cope with a changing environment, and can help inform management decisions. Through longitudinal analyses of …

Synthesizing Expressive Behaviors For Humanoid Robots, Mathias Irwan Sunardi

Dissertations and Theses

Humanoid robots are expected to be able to communicate with expressive gestures at the same level of proficiency as humans. However, creating expressive gestures for humanoid robots is difficult and time consuming due to the high number of degrees of freedom (DOF) and the iterations needed to get the desired expressiveness.

Current robot motion editing software has varying levels of sophistication of motion editing tools ranging from basic ones that are text-only, to ones that provide graphical user interfaces (GUIs) which incorporate advanced features, such as curve editors and inverse kinematics. These tools enable users to create simple motions; but …

The Experience Of Female Caregivers In The Kingdom Of Saudi Arabia, Nouf Albugami

Dissertations and Theses

In the Kingdom of Saudi Arabia ("KSA"), a minimal amount of research concerning the availability and level of social support specifically targeting the female caregiver has been conducted. Moreover, the extent to which social support has helped alleviate both the physical and psychological stress of caregiving has been studied very little, if at all. In light of this limited amount of research, the goals of this study are to investigate the following two questions: (1) What is the experience of female caregivers with chronically ill children in KSA, and (2) What is the nature and availability of social support among …

Energy Stores And Life-History Transitions In Red-Sided Garter Snakes (Thamnophis Sirtalis Parietalis), Rachel Catharine Wilson

Dissertations and Theses

All organisms must prioritize investment in either reproductive or self-maintenance activities. Despite this established paradigm, our understanding of how organisms choose to prioritize certain behaviors and physiologies over others remains limited. It is likely that an organism's energy status not only influences variation in reproductive effort, but also transitions to and from reproductive activities. My dissertation aims to investigate how energy metrics (body condition index, adipocyte follicle size, and liver glycogen) relate to reproduction and associated life-history stages in red-sided garter snakes (Thamnophis sirtalis parietalis). Chapter two examines if energy metrics differ with migratory status and sex in …

"Not 'Just' A Barista": The Story Of Portland's College-Educated Baristas, Ned William Tilbrook

Dissertations and Theses

This paper examines graduate jobs/skills mismatch in craft occupations, through semi-structured interviews with college-educated baristas working in local and craft coffee shops in Portland, Oregon. This paper asks why college educated people work in such a role as it represents an interesting example of job/skills mismatch. Findings suggest that some see it as a good stop-gap on the way to something else, while others hope to use the skills they learned in studying for their degree to forge a career in the coffee industry. A desire to use these degree-relevant skills is prevalent throughout the sample, however many are still …

Intimate Partner Violence Risk Assessment: The Additive Value Of Victim Reported Risk, Jennifer Joanne Johnson

Dissertations and Theses

Intimate partner violence (IPV) affects millions of people in the United States, causing negative generational consequences to the victim and the community. The criminal justice system has increased its preventative strategies to combat this issue through mandatory arrest laws and the use of risk assessment tools for determining the likelihood of offender recidivism. Risk factors included in standardized and actuarial risk assessment tools have been found to be relatively good predictors for violent recidivism.

This study assesses the predictive accuracy of risk factors through bivariate correlations and multiple logistic regression analysis. The risk factors analyzed include demographic information, mental health …

Variability In Historical Fire Patterns Of A Moist Mixed-Conifer Forest In The Northern Blue Mountains Of Oregon, Laura Marie Platt

Dissertations and Theses

High variability in historical fire patterns characteristic to mixed-severity fire regimes is expected to have contributed to a structurally heterogeneous landscape throughout much of the forested ecosystems of the western United States. After more than a hundred years of fire exclusion in the region, many forests have shifted to a more homogeneous structure, which raises concern regarding these forests' ability to sustain expected increases in fire activity with a warming climate. The shift is not uniform across the west, however, and differences in historical disturbance patterns and changes due to land management are not well characterized in forests across a …