Digital Commons Network^™

Capstone Review: Warn Winch Proximity Sensor, Leana Girton

University Honors Theses

This thesis reviews the mechanical engineering capstone project that designed a winch proximity sensor for WARN Industries. WARN is very interested in developing this product for market as a safety and ease-of-use accessory, and working with Portland State University was the first step in this process. A group of four mechanical engineering and four electrical engineering capstone students collaborated to research sensor types, test the selected methods, and design and build a prototype. The final design implements an inductive ring, a mechanical button, and bluetooth signaling. The project succeeded in prototyping a proximity sensor for WARN, who will have access …

Exploring The Durability Of Marine Picocyanobacterial Microcolonies, Erik Swanson

University Honors Theses

Picocyanobacteria of the genus Synechococcus are widespread aquatic photoautotrophs that play essential roles in primary production and carbon cycling. Some Synechococcus strains form multicellular microcolonies, but the mechanisms of cell-to-cell attachments and structural durability of these microcolonies remain poorly understood. This research investigated the physical durability of microcolonies in two marine Synechococcus strains (CC9605 and CC9311) using physical disruption treatments. Cultures were subjected to vortexing and sonication treatments, and populations of single cells and microcolonies were quantified using flow cytometry based on differences in measures of size. Results indicated that strain CC9605 showed no significant treatment effect, whereas CC9311 displayed …

Psychological Architecture: Evaluating The "Greenhouse Model" As A Structural Standard For Lgbtq+ Well-Being, Ava Lee

University Honors Theses

Traditional LGBTQ+ mental health frameworks often conceptualize psychological safety as a matter of individual endurance. This paper critiques this focus on adaptive resilience, which systematically shifts responsibility from institutions to individuals. To counter this, the study introduces "Psychological Architecture," a framework viewing social environments as constructed infrastructures that can either support or undermine queer well-being. The model contrasts performative "Glasshouses," which prioritize visibility over safety, with engineered "Greenhouses" that nurture sustainable safety through three sequential pillars: Authentic Representation (walls), Emotional Validation (insulation), and Vocal Activism (ventilation).

Grounded in the findings of a 2024 qualitative pilot study of a queer roller …

Not Everyone Gets A Tree: Housing Values, Street Trees, And Equity In Portland, Matthew Moller

University Honors Theses

Street trees are positively associated with Portland home sale prices, but exposure and capitalization are uneven by race/ethnic neighborhood context. Urban trees are ecological assets, but their economic and equity implications remain uneven. This thesis examines street-tree exposure and 2023 residential sale prices in Portland, Oregon (n = 6,414) using a mixed-methodology hedonic design. Ordinary least squares models measure inventoried street-tree counts within 20m, 50m, and 100m buffers together with structural controls and census-block racial and ethnic context. Trees are positively and significantly associated with logged prices at all radii, with scale-sensitive magnitudes and modestly better fit as wider buffers. …

The U.S. Shopping Mall: Opportunities For Preservation And Transformation Through Adaptive Reuse, Sophia Janzen

University Honors Theses

The U.S. shopping mall, once an integral part of suburban living and community, has slowly disappeared from cities nationwide. What used to be thousands of malls sprinkled throughout America in the 20th century is estimated to be 900 by 2028. A mall's programming of the past is lacking a place in the future, but their architecture leaves a desolate structure in the midst of our cities. Through adaptive reuse, the intentional redevelopment of a preexisting structure, how can malls be thoughtfully revitalized and given a greater purpose within their surroundings?

This research analyzes successful adaptive reuse strategies implemented in few …

The Effects Of Adverse Childhood Experiences On Female College Students' Social Emotional Development: Is Flourishing Possible?, Kaylee Kirkwood

University Honors Theses

Adverse childhood experiences are events of trauma and abuse that occur prior to age eighteen. High rates of sexual violence against girls and female undergraduate students inspired this study to explore how trauma may impact development and overall college experience. This thesis employed a small exploratory pilot study to investigate childhood trauma and social-emotional development among a small sample of female college students (ages 18-25; n = 41). Participants recruited through the Prolific Database completed an online Qualtrics survey consisting of screeners, demographic questions, measures of trauma history and emotional functioning, and optional open-ended experience-based questions. Measures were guided by …

A Twilight World Of Unspeakable Horror: Lesbian Camp And The Vampire Lovers (1970), Mirielle Lemay

University Honors Theses

From the late 1960s through the early 1970s, a wave of lesbian vampire themed exploitation films proliferated through UK, US, and Western European cinemas. In critical literature on this subgenre, camp reading is often dismissed, unacknowledged, or understood as circumscribed by authorial intent and/or intended audience. With this alternating lack of attention to and dismissal of camp, the interpretive agency of the queer spectator is constrained, their spectatorship implicitly subordinated to that of the "conventional" horror audience—the voyeuristic-sadistic male spectator. Through a reading of The Vampire Lovers, a 1970 British production from Hammer Studios, I seek to explore how …

Disability Experiences Of University Students: An Interview Study, Cece Austin

University Honors Theses

This thesis explores the experiences of college/university students with disabilities within the educational system. Using a qualitative research design, semi-structured interviews were conducted with students who identify as disabled or having disabilities in order to explore impacts of disability on their lives, with a focus on experiences navigating academic environments and accessing accommodations. Findings revealed two recurring themes: 1) the importance of both registered accommodations and accessibility efforts from faculty, and 2) difficulties with accommodations, internalized ableism, and disclosure. This research contributes to broader discussions on disability, inclusion, and educational equity by highlighting the lived experiences of students with disabilities …

Holding Pattern: The Making Of An Ep, On Intuition, And Form Becoming The Content, Oscar Larson Phillips

University Honors Theses

This craft essay traces the making of "Holding Pattern," a three-song EP representing the culmination of five years of development in composition, production, lyric writing, and sound engineering. Each song addresses its own distinct emotional territory: the tension between confidence and self-doubt, resistance to creative conformity, and the experience of emotional dissociation. Together they form a single arc: reaching out, holding your ground, and surviving it. This essay moves through each song, examining how production decisions, lyrical construction, and the recording process each served the content of the work. Working intuitively across composition, sampling, collaboration, and recording, what only became …

Applications Of Prior And Novel Computational Tools In Mental Health Treatment, And Their Potential To Uncover The Explanatory Gap, Ambika Vyas

University Honors Theses

The explanatory gap is a widely discussed concept in scientific and philosophical literature. In neuroscience, the solution to the explanatory gap is highly sought out, but the general consensus is that it is unsolvable. Numerous articles discuss the explanatory gap alongside computational tools and how these tools could aid neuroscientists in uncovering the mental health explanatory gap. However, significant developments in machine learning have been made since 2020, coinciding with the rise in Large Language Models (LLMs). This thesis is a literature review on computational methods, tools, and devices developed and utilized by researchers to improve how mental health disorders …

Gps Tracking Smart Dash Cam Capstone Review, Simrah Saleem

University Honors Theses

This thesis details our design, implementation, and collaborative development of an intelligent vehicle logging system built on a Raspberry Pi 5. Unlike standard consumer dash cams that act as closed "black boxes," our system uses a dual-camera stereo vision setup integrated with centimeter-level accuracy. While we successfully built a functional Proof of Concept capable of event-triggered recording, dual-monitor visualization, and smart detection and recognition, this paper focuses on our engineering journey and the real-world challenges we faced. Using an Agile framework, we split into three specialized sub-teams to handle hardware, database, and interface design in parallel. This structure created unique …

Hillslope Aspect And Other Potential Controlling Factors On The Spacing Of Periglacial Stone Stripes In Se Oregon, Blue Hansen

University Honors Theses

Stone stripes are a type of patterned landscape that can be polygenetic in origin, but in the High Lava Plains province are interpreted to be relict periglacial features based on similarities to active stone stripe formation in current periglacial settings. Periglacial stone stripes are hypothesized to form via frost process, including ice-driven cracking and soil heave which is dependent on temperature, long-term differences in temperature may contribute to differences in stone stripe patterns or density. Stone stripes in Oregon and Idaho have previously been studied using field techniques, but there is room for reexamination of temperature controls on hillslope density …

"Address It Or Suppress It": What We Can Learn About Rpf From Celebrity Responses, Z Maloney-Dunn

University Honors Theses

In a growing culture of parasociality, ways of engaging with celebrities are constantly changing. RPF (Real Person Fiction) is an often controversial subgenre of fanfiction written about real people. This thesis examines how celebrities respond to RPF written about them, using two case studies: the pairs of Dan Howell and Phil Lester as well as Greg Davies and Alex Horne. Both case studies have reacted positively to RPF, but have very different relationships with their audience and ways of responding to them. Through an analysis of various statements made by the subjects over the years, this thesis seeks to gain …

An Exploratory Latent Segmentation Approach To Account For Temporally Shifting Parameters In Driver Injury-Severity Models, Tanmoy Bhowmik, Shahrior Pervaz, Fred Mannering, Naveen Eluru

Civil and Environmental Engineering Faculty Publications and Presentations

Temporally shifting parameters in crash severity modeling is a well-documented phenomenon, with growing evidence suggesting that the influence of explanatory variables changes over time due to shifts in driver behavior, vehicle technology, and roadway conditions. Many studies have examined this issue by comparing the temporal stability of adjacent-year data using a variety of modeling frameworks that have often assumed a homogenous effect of explanatory variables across the entire crash population. The current research effort departs from past work in two ways. First, it compares data separated by multiple years (instead of comparing adjacent years), and second, it tests the homogeneous …

Assessment Of Information Literacy Instruction In Reference: Applying Vanscoy’S Conceptual And Procedural Framework In Practice, Vanessa Arce

Communications in Information Literacy

The instructional aspect of reference work has long been acknowledged, especially in academic libraries. The current RUSA guidelines include helping users develop information literacy as a goal of reference. In this context, investigating the presence and nature of information literacy instruction can be used to assess the quality of reference services. This study applied Amy VanScoy’s conceptual/procedural framework for point-of-need instruction to a sample of chat reference transcripts at Lehman College, City University of New York. One of the assessment’s goals was to determine the prevalence of instruction and type of knowledge addressed in reference interactions. Another goal was to …

Bayesian Optimization Of Laser Wakefield Acceleration Via Spectral Pulse Shaping, B. Z. Djordjević, C. Benedetti, Asa D. Mcnaughton, R. Lehe, H.-E. Tsai, S. C. Wilks, B. A. Reagan, G. J. Williams, J. Van Tilborg, C. B. Schroeder

Physics Faculty Publications and Presentations

In this paper, we investigate the effect of spectral pulse shaping of the laser driver on the performance of channel-guided, laser–plasma accelerators. The study was carried out with the assistance of Bayesian optimization using particle-in-cell simulations. We used a realistic plasma profile based on a novel optical-field-ionized channel technique with ionization injection and low, on-axis plasma densities to maximize the energy gain of the electron bunch trailing the laser. Spectral shaping allows us to modify the temporal profile of the laser driver while keeping the laser energy constant, affecting the acceleration and injection processes. In addition, we consider how modifying …

Coupled Ferroelectricity And Phonon Chirality, Xiang-Bin Han, Cong Yang, Rui Sun, Xiaotong Zhang, Thuc Mai, Zhengze Xu, Aryan Jouneghaninaseri, Xiaoning Jiang, Rahul Rao, Yi Xia, Multople Additional Authors

Mechanical and Materials Engineering Faculty Publications and Presentations

Recognizing the coupling between ferroelectricity and chirality in optically active ferroelectrics opens a route for manipulating chirality via ferroelectricity under an external electric field, enabling control over chirality-dependent quantum states. Here, we report the experimental demonstration of the coupling between ferroelectricity and phonon chirality in the molecular ferroelectric triglycine sulfate. By electrically switching the crystal chirality, we achieve reversible and device-compatible control of phonon chirality, as revealed by in situ time-resolved magneto-optical Kerr effect measurements. The Kerr rotation reverses with electric-field switching, while phonon chirality vanishes in the paraelectric phase and is tunable in the racemic ferroelectric state. Furthermore, density …

The Effect Of Incidental Emotions On Self-Control: An Examination Using A Need-Based Choice Model, Shruti Koley

Business Faculty Publications and Presentations

Purpose – The purpose of this paper is to develop a framework that examines the effects of incidental emotions on choices in self-control dilemmas. The framework predicts that the effect of emotions depends on the hedonic and non-hedonic needs they activate and the extent to which emotional consumers expect the virtuous and gratifying options in the choice dilemma to facilitate these needs (i.e. their instrumentality toward the activated needs). The framework helps develop propositions for the self-control effects of six commonly experienced emotions: happiness, sadness, pride, guilt, anger and anxiety. Design/methodology/approach – The author uses a choice model to develop …

Intersectionality And Insurgent Citizenship: Women Of Color Feminism In 1970s New York City, Genevieve Bonner Davis

Dissertations and Theses

Not since the phrase "Ain't I a Woman" has African American women's intellectual leadership and insight been as visible and influential as the contemporary concept of intersectionality. Like Sojourner Truth's iconic intellectual intervention in the anti-slavery movement, intersectionality has experienced a similar trajectory of dissolution, distortion, appropriation, and popularization. Since its articulation by Black legal scholar Kimberlé Crenshaw in 1989, intersectionality theory has had a bumpy road to its buzzy, if controversial, status in the firmament of twenty-first-century political thought.

This thesis traces the origins of intersectionality theory through three distinct but intertwined phases. Phase one is the genealogy of …

Oregon State Rank Assessment For Straggling Gilia (Allophyllum Gilioides), Lindsey K. Wise

Institute for Natural Resources Publications

Oregon state conservation status assessment for Straggling gilia (Allophyllum gilioides) using NatureServe methodology, 2026.

Isometric Force Characterization Of Braided Pneumatic Actuators, Ben Bolen, Mohammad Elzein, Lawrence Pang, Alexander Hunt

Mechanical and Materials Engineering Faculty Publications and Presentations

Artificial muscles such as braided pneumatic actuators (BPAs) offer many advantages for robotic systems, including high durability and strength-to-weight ratios. However, their use in robotic systems is still extremely limited, in part due to their poor force, length, and pressure characterization. In this work, a test setup is created to compare force produced by Festo fluidic BPAs with leading models. Our analysis of the data has resulted in (1) the development of new equations to calculate force as functions of pressure and contraction for Festo BPAs with uninflated diameters of 10 mm and 20 mm, and (2) a novel equation …

The Lion's Share: The Secret Land Grab Of Drake's Circumnavigation, Melissa Cole Darby

Anthropology Faculty Publications and Presentations

Francis Drake’s journey around the world between 1577 and 1580 is renowned as one of the most famous voyages in history. The circumnavigation was a great achievement for England, but the official story Queen Elizabeth and her Privy Council maintained for nine years was that Drake was a pirate, and that the treasure he captured on the voyage would be returned to Spain. Upon his return, information about the voyage and his route were suppressed and the crew was sworn to secrecy: they were not to reveal where they travelled on ‘pain of death’. Here I present the case that …

Symmetry And Psychosocial Adaptation To Trauma, Illness And Disability Part I: Views From Physics, Medicine And Psychology, Hanoch Livneh

Leadership, Learning and Counseling Faculty Publications and Presentations

The aim of this two-part paper is to discuss the concept of symmetry and its derivatives, symmetry breaking and asymmetry, and the role they assume in elucidating the structure and processes that underlie psychosocial adaptation to traumatic experiences. To achieve this aim, in Part I, first, a cursory review of symmetry is undertaken as it applies to physics, including conservation laws, the forces of nature, and leading theories of nature. Second, the paper addresses how symmetry is perceived in biology and medicine, including symmetry within biochemical and genetic structures, the human body, and the onset of disease processes. Third, the …

¡Estamos Aqui!: The Underrepresentation Of Latinos In Professional Sports And Sports Media, Antonio Hernandez

University Honors Theses

The Latino population has had a long and complicated history within the United States. Since the turn of the 21st century, Latinos continue to become the largest minority group within the country. As the Latino population continues to rise, other industries have failed to properly represent the community. Within the world of professional sports, Latinos continue to be grossly underrepresented, with professional athletes from Latino backgrounds representing less than 6% of all professional athletes across all disciplines. This number is just under ¼ of the total percentage of Latinos within the United States. With Latino's influence of other cultural phenomena …

The Educational Gender Gap Explored Through The Lens Of Hegemonic Masculinity, Marcell V. Csikos

University Honors Theses

Women's college attendance skyrocketed with the passing of Title IX, and by the eighties, college campuses featured men and women at an even fifty-fifty split. Today, women make up over fifty-seven percent of college students. It is not a new phenomenon, studies and surveys have shown that women are doing better at school for decades, but they rarely tie men's underperformance to the concept of masculinity. The study of hegemonic masculinity is an overarching theory that looks at the values, rules, and dynamics that men have to follow in order to keep their social status. This literature review uses said …

Psychosocial Risk Factors And Recidivism Among Violent Offenders, Abbey Elizabeth Burgess

Dissertations and Theses

This study examined whether changes in LS/CMI domain scores between prison intake and release were associated with three-year recidivism among violent offenders following their release from custody. While the Risk-Need-Responsivity (RNR) framework emphasizes the importance of targeting dynamic criminogenic needs to reduce reoffending, relatively little research has assessed whether changes in domain-level risk factors translate into improved outcomes over time. Using administrative data from a state correctional system, this study analyzed domain-level changes in LS/CMI scores and their relationship to rearrest, while controlling for demographic characteristics, criminal history, and institutional factors. Results indicated that changes in most LS/CMI domains were …

Justice By Geography: District-Level Variation In Pretrial Release Outcomes Across Oregon, Ethan Loomis

Dissertations and Theses

AbstractOregon’s pretrial system operates under a common statewide legal framework, yet detention and release outcomes do not appear fully consistent across jurisdictions. Earlier research on pretrial decision-making has largely focused on judicial discretion, individual-level legal factors, and the use of risk assessment tools, while giving less attention to the district-level environments in which those decisions are made. This study examines whether variation in institutional capacity, political context, demographic composition, and socioeconomic conditions corresponds with differences in pretrial outcomes across Oregon’s circuit court districts.

The study draws from focal concerns theory, racial threat perspectives, and organizational approaches to court decision-making. Rather …

A Qualitative Study Into The Impact Of Sweeps On Homeless-Serving Mutual Aid Groups In Portland, Or, Clover Javurek-Humig

Dissertations and Theses

Sweeps and land use enforcement are among the most persistent issues impacting unhoused communities. Mutual aid groups in Portland network with unhoused people regularly to mitigate the impacts of sweeps, provide direct aid, and build social capital among encampments. This study aims to understand the impact of policing and sweeps on mutual aid groups working with unhoused communities in Portland, OR. I conducted 18 interviews with mutual aid organizers and 8 months of fieldwork with mutual aid groups in Portland, OR in the years of 2025–2026. Transcripts were analyzed using a general inductive approach. This study finds that 1) Mutual …

Shoplifting: Analyzing Spatial And Temporal Patterns, Elizabeth Petrenko

Dissertations and Theses

Shoplifting has contributed to significant losses in Oregon, reaching nearly $956 million in 2022. While overall property crime in Portland, Oregon, dropped between 2023 and 2024, reported shoplifting incidents increased by 50.0%. In Oregon, stealing property worth $100 or less is third-degree theft and a Class C misdemeanor. Second-degree theft involving stealing property between $100 and $1,000 is a Class A misdemeanor. Although often classified as petty or minor theft, shoplifting imposes strain on retailers, consumers, and communities, which raises questions about the spatial and temporal distribution of this crime. This study uses Portland Police Bureau (PPB) offense data to …

Arylation Of Nitrogen, Oxygen And Carbon Nucleophiles By Aryl(Tmp)Iodonium Salts, Joseph Jordan Hatton

Dissertations and Theses

Substituted aromatic rings are present in industry in a plethora of organic molecules such as pharmaceuticals, agrochemicals, materials and beyond. Therefore, methods for broadly installing aryl rings into other compounds to create substituted aromatic rings are valuable to many organic chemists. Historically these transformations are achieved through methods such as nucleophilic aromatic substitution and metal catalyzed cross-coupling. Nucleophilic aromatic substitution is a user-friendly method in this space but is limited by reliance on specific electronics. Metal catalyzed cross-coupling reduced the dependence on electronics in this space, but metals are generally unattractive reagents due to high costs, toxicity and challenges with …