Digital Commons Network^™

The Gut Microbiome, The Gut-Brain Axis, And College Student Well-Being, Idi Mckay

University Honors Theses

This literature review examines how diet, stress, environmental exposure, and food accessibility may influence college students' mental health and academic performance through the gut microbiome and the Gut-Brain Axis (GBA). Current microbiome research often focuses on early childhood development, clinical disease populations, or older adults, while overlooking college-age students who experience significant social, environmental, and biological transitions. College students frequently face food insecurity, irregular eating patterns, chronic stress, inconsistent sleep schedules, and reduced access to nutrient-dense foods, all of which may influence microbial diversity and overall gut health.

This thesis explores how modern campus environments and lifestyle factors may contribute …

Oregon State Rank Assessment For Willamette Navarretia (Navarretia Willamettensis), Nora Dunkirk

Institute for Natural Resources Publications

Oregon state conservation status assessment for Willamette Navarretia (Navarretia willamettensis) using NatureServe methodology, 2026.

Methylglyoxal And Glyoxal In High-Puff Disposable Electronic Cigarette Liquids: Unexpected Accumulation And Enhanced Cytotoxicity, Esther E. Omaiye, Wentai Luo, Kevin J. Mcwhirter, Man Wong, Prue Talbot

Civil and Environmental Engineering Faculty Publications and Presentations

Despite concerns regarding the potential health risks associated with EC use, their design, puff count, and e-liquid formulations have continued to evolve. Aldehydes are a key class of thermal degradation byproducts generated during the vaporization of EC fluids. This study tested the hypothesis that aldehyde concentrations would be elevated in used ECs with high puff numbers. Devices from multiple brands were analyzed to assess the impact of extended use on aldehyde formation. E-fluids were extracted from field-collected and user-donated devices and analyzed using gas chromatography/mass spectrometry to quantify 178 flavor chemicals, two synthetic coolants, nicotine, solvents, and aldehydes (methylglyoxal (MGO), …

How Do Us States Define Person-Centered And Family-Involved Care In Assisted Living Regulations, Paula Carder, Lindsey Smith, Jennifer N. Bunker, Cassandra L. Hua, Erh-Chi Hsu, Isabelle Boun, Olivia M. Ainsworth, Kali S. Thomas, Eric Jutkowitz

Institute on Aging Publications

Introduction: A large share of assisted living (AL) residents have a diagnosis of dementia or cognitive impairment, and these individuals can benefit from person-centered care and family-involved care. This study examines whether and how states’ AL licenses address these topics.MethodsThis research analyzed a national database of 249 unique licensing requirements that govern 35,602 ALs in all states and associated regulations, including those that govern memory care (MC) services. We reviewed each regulation for the presence of person-centered or family involved care and then used content analysis of license requirements with at least one relevant policy to identify key categories and …

Adopting Critical Power Grid Infrastructure Technologies: An Organizational Cybersecurity Assessment Against Ransomware, Fayez Alsoubaie

Dissertations and Theses

For many years, researchers and practitioners have studied emerging technologies in field of energy production and distribution. Power grid systems carry major weights in the energy branch of the economy. Researchers and scientists have been interested in finding ways to connect the power grid gap and improve protection for its technologies.

The research supports organizational adoption and prioritization of critical cybersecurity technologies for ransomware protection in power grid infrastructure. As utilities increasingly integrate digital technologies, they become more vulnerable to sophisticated cyberattacks that can disrupt services and put public safety at risk. The main focus of the study is to …

Positive Partner Support And Veteran Well-Being: How Capitalization Support Strengthens Military Veterans And Partnerships, Maryann Dona Samson

Dissertations and Theses

Among military veterans, the transition to civilian life is often marked by elevated distress and burnout, low job satisfaction, and a lack of perceived psychological safety. Social support, especially from intimate partners, can serve as a critical protective factor. While most support literature focuses on stress-buffering in adverse contexts, positive social support, such as responsiveness to shared positive experiences (i.e., capitalization support), is a powerful though understudied process. This dissertation investigates the role of partner capitalization support, which is the responsiveness shown by a romantic partner when one shares good news, as a source of stress reduction, resilience, and relational …

Why Am I Here? Individual, Organizational, & Societal Influences Of Employee Motives To Attend Voluntary Diversity Training And Their Effects On Training Outcomes, Henri T. Maindidze

Dissertations and Theses

Diversity training is a key part of diversity management efforts, but its effectiveness has repeatedly been called into question in both academic and applied spaces, leading many to question its utility. In the case of voluntary diversity training (VDT), where employees can opt in or out of participation, those motivated to attend might not be the ones who would most benefit from participating, thereby limiting the effectiveness of VDT for the organization. As a result, understanding the predictors and outcomes of employee motives to attend VDT can guide improved implementation and evaluation of VDT. Informed by self-determination theory and training …

Assessment Of The Readiness Of Architectural Design Companies To Adopt Eco-Friendly Nanotechnologies In Sustainable Building Design, Ashwaq Essa Al Khalil

Dissertations and Theses

Nanotechnology is emerging as a promising innovation in sustainable architectural design, although its adoption remains slow. Research highlights the advantages of incorporating nanotechnologies in architecture, including improved material performance, enhanced thermal efficiency, reduced energy consumption, improved durability, and progress toward the Sustainable Development Goals (SDGs). These advantages make nanomaterials a promising solution for sustainable building design, particularly in hot-climate regions where energy consumption and carbon emissions associated with conventional building design practices remain major concerns.

Despite this potential, nanotechnology adoption in architecture faces several challenges, including limited real-world applications, slow diffusion in practice, and persistent organizational, economic, and regulatory barriers. …

Digital (In)Justice? Evaluating Procedural Justice In Online Crime Reporting, Nazmy Natia

Dissertations and Theses

Online Crime Reporting portals (OCR) have become a routine entry point for non-emergency police services, fundamentally redefining how the public initiates contact with law enforcement. Although these portals are presented as efficient and accessible, little attention has been paid to whether their design and communication serve the people who use them. Prior research on procedural justice (PJ) has largely examined face-to-face police encounters, while latest studies of OCR systems emphasize victim experience and usability. However, the existing literature offers limited guidance on how PJ principles translate from in-person encounters to digital reporting platforms. This prompted the current study, drawing on …

Aid And Assist Cases In Multnomah County: An Exploration Of Ors 161.370, Savannah Jurasek

Dissertations and Theses

Individuals with severe mental illness (SMI) are highly overrepresented in jails. In Oregon, these individuals can be eligible for what is referred to as the aid and assist process (ORS 161.370) which is designed to facilitate restorative care in efforts to ensure that vulnerable individuals can rationally participate in their criminal proceedings. However, continuous escalation in aid and assist orders (109.3% between 2011-2025) has led to strain on the Oregon State Hospital, the primary care facility for this population. As a consequence, defendants with SMI are spending unnecessary time in custody, despite hospitalization admission guidelines governed by previously decided case …

Shifting Perspectives In Mathematics: Examining Preservice Elementary Teachers' Evolving Conceptions Of Mathematics, Identity, And Social Inequality Through Course Design, Autumn Thu Pham

Dissertations and Theses

Mathematics is often viewed, taught, and learned as an abstract, stand-alone subject, with an emphasis on procedures that are frequently disconnected from learners' lived experiences. Within this framing, limited attention is given to students' affect and identities in relation to mathematics. As a result, opportunities to engage with mathematics as a social, sociopolitical, and empowering tool remain rare. These patterns highlight an important implication for teacher education programs: when mathematics is framed primarily as abstract and procedural, preservice elementary teachers (PTs) may enter the profession lacking strong conceptual understanding, pedagogical flexibility, and the social and political awareness needed to effectively …

Expanding Transmobilities: Understanding Genderdiverse And Transgender Travel Behavior Through An Art-Informed Methodology, Nicholas Michael Puczkowskyj

Dissertations and Theses

Transgender and genderdiverse people face discrimination and harassment in public when making trips in Portland, OR. People who identify as genderdiverse or transgender create unique travel behavior due to the influence of their internalized and expressed gender identity and through interactions in public. This dissertation examines how gender identity influences the travel behavior of genderdiverse and transgender people and how these experiences influence their subjective wellbeing when making trips in Portland, Oregon. Traditional one-on-one interviews were conducted in conjunction with allowing the interviewees to produce art as a non-verbal form of expression and communication of their experiences making trips in …

Acceptance Of Shared Autonomous Vehicles: Exploring The Attitudes And Perspectives Of Older Adults, Sara Sohaee Urbina

Dissertations and Theses

The fast development of autonomous vehicle systems will create major changes in how people move around. Previous research shows that these technologies can benefit older people who struggle with mobility, safety and access to transportation. Shared Autonomous Vehicles (SAVs) enable older people to achieve self-reliance while obtaining essential services which enhance their quality of living. The successful deployment of SAVs requires users to accept this new technology which they must also be willing to use. This research study investigates which elements affect older adults to adopt SAVs by using an extended Technology Acceptance Model (TAM) framework.

The research design of …

Foundations' Deep, Emily Williams, Morgan Williams

University Honors Theses

Most historic buildings do not survive as they were built, yet preservation frameworks still tend to evaluate them as if they did.

Foundations' Deep begins with a structure located in Helena, Montana 59602, a building that sits uneasily within the categories it has been asked to meet. Built in the early twentieth century, it has persisted through alteration, abandonment, and use. What remains is not a stable artifact but a record of accumulated decisions, some careful and many indifferent, now embedded in the fabric of the building itself.

The thesis grows from this condition and from the limits of the …

Profiles Of Family Engagement In Head Start, Elizabeth Jane Tremaine

Dissertations and Theses

Families of young children are active participants in their child's transition to kindergarten. Head Start is designed to facilitate families' engagement in their child's learning experiences (Head Start Parent, Family, and Community Engagement Framework, 2018). This study explores family engagement in Head Start, its changes across the transition into kindergarten, and its relation to children's development of social-emotional and executive function skills.

The current study addresses limitations of previous research by relying on family perspectives of family engagement, approaching family engagement as a developmental concept, and taking a person-centered analytic approach that accounts for the multi-dimensionality of family engagement. This …

Entre La Lucha: Familismo And Well-Being Of Latino Immigrant Families Navigating Manual Labor And Anti-Immigrant Sentiment, Faviola Robles Saenz

Dissertations and Theses

The United States' history of treatment toward Latino immigrants has been shaped by anti-immigrant sentiment and exploitative labor practices, creating psychological violence that harms their families' well-being. Although previous research has examined anti-immigrant sentiment, labor conditions, and familismo among Latinos, these areas are often studied in isolation, with limited attention to their intersections and how they are experienced across generations. Informed by history, prior research, and my lived experiences, this study qualitatively explored the intersections of anti-immigrant sentiment and parents' manual labor to understand how these contexts shape familismo and well-being among Latino immigrant families. This work was grounded in …

Ambivalence, Foremourning, And Displacement In The German Translation Of Marie Bonaparte's Topsy, Kooper Wilson

University Honors Theses

This paper offers a reading of Sigmund Freud’s German translation of Marie Bonaparte’s book, Topsy: The Golden-Haired Chow, in which the author attempts to both delay the death of her dog and mourn it in advance through what I call foremourning. I argue that the manifest subject matter of Topsy should not be interpreted away as a projection of merely human concerns, but rather that close attention to Freud’s translation introduces themes from his analytic experience which engender an appreciation of Topsy’s atopia (intractability). I draw from recent psychoanalytic theory, literary criticism, and deconstruction, especially Jacques Derrida’s seminars …

Getting Close, Sadie Laufe Mccarthy

Dissertations and Theses

"Getting Close" is a collection of short pieces, some fiction and some memoir. It's not important which is which.

I'm interested in the barriers we face when it comes to connection, and how aloneness can often be more sensual than togetherness. I'm interested in the places we find respite from the pain of existing within societal pressures.

I'm not interested in acceptability. I write toward a world in which we do not have to be anything other than ourselves.

Pieces Of The Pathway: A Qualitative Exploration Of Social Support For Individuals Navigating Houselessness, Desiree' Jane Duboise

Dissertations and Theses

Houselessness has long been an issue of pressing concern in the United States; and in Multnomah County, Oregon, approximately 10,526 people are experiencing houselessness. Social support has been identified as a critical factor in helping people navigate houselessness and will be explored in the current study. Specifically, the current study examines social support among populations with lived experience of houselessness as they navigate pathways through houselessness. The current study is situated within a broader study examining journeys through houselessness called the Pathways study, and it utilizes a subsample of individuals involved in the Pathways study. The Pathways study and the …

Disaster Justice: Queer And Disabled Mobilities And Infrastructures Of Care In The Pacific Northwest, Rachel Springer

Dissertations and Theses

This dissertation examines the social, political, and environmental pressures that drive LGBTQ+ migration to the Pacific Northwest and the social infrastructures people find on arrival. Drawing on thirty-four semi-structured interviews with LGBTQ+ adults who relocated between 2022 and 2025, it argues that these movements are best understood as responses to slow-onset disasters produced by the compounding interaction of legislative targeting and infrastructural violence.

State-level legislation targeting LGBTQ+ people—particularly transgender individuals—has fractured the geography of safety in the U.S., producing a landscape where civil rights, healthcare access, and everyday security vary dramatically across space. For those navigating these conditions at the …

Social Influencers Reduce Infection Burden And Modify Epidemic Lag In Group-Structured Populations, Aja Sutton, Adam Z. Reynolds, Matthew A. Turner, James Holland Jones

Publications, Reports and Presentations

The impact of online social influence on social learning, health behaviour and population health is a new, rapidly developing area of study. Previous research focused specifically on digital influencers suggests they may be able to affect group-level diffusion of health-protective behaviours such that they modify epidemic outcomes. However, formal models have yet to test the intuitive hypothesis that the effect of digital influencers is sufficient to generate tangible real-world effects on epidemics. We develop an agent-based model that incorporates digital influencers into an epidemic scenario to test hypotheses about how competing influence messages affect the diffusion of health-protective behaviours throughout …

Exploring Information Literacy Skills, Attitudes, And Barriers Among Medical And Nursing Students In Bahrain: A Mixed-Methods Perspective, Asif Altaf, Suchita N. Dsilva, Simple Sibi Joseph, Fida Mukhtar, Muhammad Zeeshan, Bindhu Nair

Communications in Information Literacy

Information literacy is essential for evidence-based medical education, yet Gulf-region studies rarely examine student competencies and barriers. This study examines the information literacy skills, attitudes, and challenges faced by medical and nursing students at RCSI Bahrain. A mixed-methods design was employed, combining a quantitative survey (n = 343) with qualitative focus groups (n = 10). Students reported high self-perceived information literacy across domains. Time constraints and information overload were identified as the primary barriers to effective communication. Focus group findings highlighted the late introduction of curricula, technical access challenges, and inequities between medical and nursing programs. Library training attendance, academic …

Japanese Learners And Mixed-Speech Styles, Nana Kawada

Dissertations and Theses

This study explores to what extent Japanese as a Target Language (JTL, henceforth) learners use mixed-speech styles. "Mixed-speech styles" refers to the phenomenon that occurs when speakers shift speech styles during the course of an interaction. The three primary speech styles are (1) the desu/masu forms, which are generally considered formal speech-level markers, (2) the non-desu/masu forms, considered informal speech-level markers, and (3) the Chūto shūryō-gata, which I translate to unfinished utterances that do not contain a clear style-marker.

The studies examined naturally occurring conversation point out that Japanese speakers often strategically manipulate and mix these speech styles …

Introduction To Mathematical Analysis Ii, Beatriz Lafferriere, Gerardo Lafferriere, Mau Nam Nguyen

PDXOpen: Open Educational Resources

These lecture notes complement the book Introduction to Mathematical Analysis I, Third Edition, with sections on integration, numerical series, series of functions, and selected advanced topics. Together, both volumes support a one semester or two-quarter course on introductory mathematical analysis.

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Oregon Metro’S Regional Land Banking Site Selection Strategy, Margot Mcneely, Autumn Fluetsch, David Archuleta, Denise Torres, Dylan Giliberto, Rebekah Markillie

Master of Urban and Regional Planning Workshop Projects

Project Background

For over a decade, communities in the Portland metro area have been struggling under a mounting housing affordability crisis. These trends particularly affect Black, Indigenous, and other people of color as well as immigrants, seniors, veterans, and people with disabilities. Given these mounting challenges, the region has turned to Oregon Metro to intervene.

Metro is currently studying land banking as a tool for implementing its Regional Housing Coordination Strategy and promoting affordable housing development in the Portland metro region. While they have acquired numerous sites that have been successfully developed into affordable housing, they are looking to improve …

Homelessness And Business: Perception, Affect And Opportunity, Asatur Nor-Ashkarian

University Honors Theses

This thesis examines the relationship between business owners and individuals experiencing homelessness within urban commercial districts in the United States, arguing that the dynamic is shaped primarily by spatial concentration, uneven power structures, economic pressure, and public framing rather than simple conflict between competing interests. Drawing on stakeholder analysis, business perception surveys, a mixed-methods study, and an original content analysis of 50 news articles spanning 23 states, this thesis identifies a consistent pattern: business owners broadly perceive homeless presence as negatively impacting safety, cleanliness, and consumer behavior. Local news media reinforces those perceptions through predominantly negative framing of homeless individuals. …

Radical Social Work In The United States: An Integrative Literature Review, Anastasia Miller

University Honors Theses

Scholars have noted that social work in the United States is particularly dependent on, and tied to, the government. While frameworks that are popular in the U.S. explicitly provide social support, they also implicitly maintain social order. Thus, social work in the U.S. may provide immediate, short-term relief, but as a result of government-imposed limitations, dominant social work frameworks do not work towards the ultimate liberation of humanity. Radical social work methods both challenge and liberate service users, along with those who deliver them.  Existing scholarship has examined the development and implementation of radical social work across the globe– especially …

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 …

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. …