Digital Commons Network^™

The Hottest Areas In U.S. Cities Are Losing The Most Greenery, Yunjae Ock, Vivek Shandas

Geography Faculty Publications and Presentations

Due to the significantly increasing impacts of urban heat, cities are seeking to expand tree canopy, parks and other forms of greenery to reduce temperatures. Despite these efforts, few studies have examined the relationship between neighborhood-scale thermal conditions and changes in green spaces. The present study drew on high-resolution, near-surface air temperature measurements in 33 U.S. cities to answer two research questions: (1) to what extent did these cities’ greenery change from 2013 to 2022? and (2) did these study areas have an increase in greenery within neighborhoods exhibiting the hottest air temperatures? Results suggest that 72.7% of cities are …

Justice For Animals In Climate Change Integrated Assessment Models, Bob Fischer, Avram Hiller

Philosophy Faculty Publications and Presentations

Integrated assessment models (IAMs) exclude individual non-human animal welfare, despite clear evidence that climate change will harm billions of animals through habitat loss, extreme weather, and ecosystem disruption. We argue that this is a significant moral oversight. Further, incorporating animal welfare into IAMs is technically feasible, using traditional economic methods or novel ones. Crucially, accounting for animal welfare in IAMs need not undermine considerations of justice for humans.

Black Women In Oregon Academia, Topanga Shakur-Freeman

PSU McNair Scholars Online Journal

Black women scholars are a powerful demographic of intellectuals navigating a haunted house of academia, a structure erected upon the bones of a grotesque past. Black women scholars navigate a complex and often hostile academic landscape, a realm marked by under representation and the insidious interplay of race and gender. Oregon, a state steeped in a sinister history of racial terror, casts a long shadow over its present. Its soil, contaminated by the blood of countless Black lives, serves as a fertile ground for the insidious growth of systemic racism. Until 1905, a malevolent decree barred Black individuals from even …

On The Need Of Pluralism And Common Ground In Sla, Simona Pekarek Doehler, Steven L. Thorne, Soren W. Eskildsen, Marije C. Michel

World Languages and Literatures Faculty Publications and Presentations

Hyperbolic claims that SLA is in crisis (!), that a unifying theory is overdue, or that research must be oriented toward pedagogy have resurfaced once again—most recently in the response by Lantolf et al. (2025) to the Special Issue on Synergies in Second Language Acquisition and Teaching (SLA/T) (Atkinson et al., 2025). Our own position is diametrically opposed to such claims.

High-Throughput Computational Framework For High-Order Anharmonic Thermal Transport In Cubic And Tetragonal Crystals, Zhi Li, Huiju Lee, Chris Wolverton, Yi Xia

Mechanical and Materials Engineering Faculty Publications and Presentations

Accurate first-principles prediction of lattice thermal conductivity (κ L) remains challenging in identifying materials with extreme thermal behavior. While the harmonic approximation with three-phonon scattering (HA + 3ph) is now routine, reliable κ L prediction often requires higher-order anharmonic effects, including self-consistent phonon renormalization, three- and four-phonon scattering, and off-diagonal heat flux (SCPH + 3, 4ph + OD). We present a state-of-the-art high-throughput workflow that unifies these effects and apply it to 773 cubic and tetragonal crystals spanning diverse chemistries and structures. From 562 dynamically stable compounds, we assess the hierarchical impacts of higher-order anharmonicity. For around 60% of materials, …

"We're Going To Tear Up The Caldera So We Can Have An Electric Car": Wrestling With Prospective Lithium Mining In The Oregon Desert, Elizabeth Bartholomew, Alida Cantor, Kate Berry, Noel Vineyard

Geography Faculty Publications and Presentations

Extraction of lithium, a key ingredient for renewable energy transitions, is a land- and water-intensive process. In this study, we use qualitative, place-based research to explore socio-environmental imaginaries surrounding a landscape on the verge of change due to lithium mining. We examine the ways that different actors are wrestling with the costs, benefits, and uncertainties of potential open-pit lithium mining in Oregon’s section of the McDermitt Caldera. In contrast to previous research which has described support for mining amongst those closest to the mine site, we find that in this case, perceptions of mining are characterized by ambivalence, uncertainty, and …

The Multidimensional Online Civic Engagement For Youth (Moce-Y) Scale: Development And Validation, Yue Ni, G. John Geldhof, Kelly D. Chandler, Richard A. Settersten Jr

Psychology Faculty Publications and Presentations

Online civic engagement among young people may represent a form of positive youthdevelopment in digital spaces. However, its impacts on youth’s well-being remain unclear,partly due to a lack of validated measures that capture the unique features of the internetand incorporate youth voices. To address this gap, we developed and validated a scale ofmultidimensional online civic engagement for youth aged 15 to 25 years (MOCE-Y) using anexploratory sequential mixed-methods approach. Qualitative interviews with 12 youth sup-ported the multidimensional structure derived from literature, from which we developed aninitial 40-item scale. Exploratory (N ¼ 159) and confirmatory (N ¼ 244) factor analyses withtwo …

Coexisting Salps Exhibit Distinct Feeding Selectivity On Microorganisms In The North Pacific Subtropical Gyre, Anne W. Thompson, Kylee Lamberson, Kelly R. Sutherland

Biology Faculty Publications and Presentations

Mortality mechanisms play an important role in how oceanic microorganisms contribute to global biogeochemical cycles. Salps are widespread pelagic tunicates known to remove phytoplankton from coastal and high-latitude waters, but their interaction with microorganisms in the vast tropical and subtropical gyres is not well quantified. Using quantitative measurements of six major marine microorganisms in the guts of six distinct but co-occurring salp species from the North Pacific Subtropical Gyre, we examined the impact and dynamics of salp feeding on marine microorganisms in a vast open ocean region. All salps preferentially removed prey greater than 1 μm in diameter, including marine …

Thinking Otherwise With Children In Cities: A Storying Approach To Co-Researching With Children And Teachers, William A. Parnell, Sally Guyon

Leadership, Learning and Counseling Faculty Publications and Presentations

This Children in Cities research project examines an approach to storying research that foregrounds collaborative meaning-making between educators and young children in their city. Through exploring how educators and young children might “think otherwise” about teaching, learning, and participation with history, Place noticing and entanglements between humans, more-than-human, and non-humans, three stories and a metaphor surface in the data. Drawing on three stories, metaphor is employed as an analytic and integrative device to deepen interpretation of lived experiences. Central to the methodology is a democratic orientation that seeks to reduce hierarchical boundaries, engaging children aged 3–5 as co-researchers in the …

The Gut Microbiota Shapes The Human And Murine Breath Volatilome, Ariel J. Hernandez-Leyva, Amalia Z. Berna, Maggie H. Bui, Yang Liu, Anne L. Rosen, Michael A. Lint, Samantha A. Whiteside, Natalia Jaeger, Nikhilesh Joardar, Wentai Luo, Multiple Additional Authors

Chemistry Faculty Publications and Presentations

The gut microbiota is crucial to health, yet implementation of microbiota-based therapeutics is limited by the lack of rapid diagnostics. We hypothesize that breath contains gut microbe-derived volatile organic compounds (VOCs) reflecting microbiota composition and metabolism. In healthy children, we found that breath VOC composition (or volatilome), assessed by gas chromatography-mass spectrometry, correlates with gut microbiome composition and function. By capturing exhaled breath from human-stool-colonized and monocolonized gnotobiotic mice, we profiled breath VOCs and discovered that murine breath is also significantly influenced by the gut microbiome. VOCs from cultured gut microbes were identified in vivo in monocolonized gnotobiotic colonized mice. …

Global Deep-Sea Hydrothermal Deposit Metagenomes And Metagenome-Assembled Genomes Over Time And Space, Emily St John, Anna-Louise Reysenbach

Center for Life in Extreme Environments Publications

Actively venting high temperature deep-sea hydrothermal vent deposits along tectonic spreading centers and in backarc basins harbor a rich diversity of thermophilic Bacteria and Archaea, many of which have no representatives in cultivation nor any genomic representation in databases. Here, in order to produce a global-scale time series metagenomic resource for studying the microbial functional and genomic diversity in these high temperature ecosystems, we obtained 70 metagenomes from collections across spatial and temporal gradients from 21 different vent fields spanning 16 years (1993-2009). The dataset (Deep-Sea Hydrothermal Vent dataset (DSV70)) includes 3.56 Tbp of raw DNA sequence reads, that have …

Wild@Fire2025: Overview Of Word-Level Code-Mixed Language Identification In Dravidian Languages, Ameeta Agrawal, Asha Hegde, Sharal Coelho, Sabur Butt, Fazlourrahman Balouchzahi, Sudha V, Shashirekha Hosahalli Lakshmaiah

Computer Science Faculty Publications and Presentations

Code-mixing is considered as a linguistic phenomenon that combines several languages into one text. It has now become very common in multilingual societies, especially in digital communication. Word-Level Identification of Languages in Dravidian Languages (WILD) - a Code-mixed Language Identification (CoLI) in Dravidian languages shared task, organized as a part of Forum for Information Retrieval and Evaluation (FIRE) 2025, put forward these challenges to the researchers by asking them to develop models capable of classifying words in code-mixed texts involving Dravidian languages - Tamil, Telugu, Malayalam, Kannada, and Tulu, which are interwoven with English. It poses significant challenges due to …

The Explored Experiences Of Latino Families In The Neonatal Intensive Care Unit, Devlynne S. Ondusko, Veronica I. Underwood Carrasco, Astrid Platteau, Susanne Klawetter, Roberta Suzette Hunte, Emily Hawkins Carter, Morinne Osborne, Jaime W. Peterson

School of Social Work Faculty Publications and Presentations

While many families experience multiple etiologies of stress during a neonatal intensive care unit (NICU) admission, unique stressors arise for certain groups that are at higher risk for disparities in infant outcomes, including Latino families. The objective of this study was to explore the experiences of Latino families regarding support received in the NICU while their infant was hospitalized to identify ways to enhance the quality of care.

Citizen Engagement In Budget Simulation: Examining The Effectiveness Of Balancing Act Modules In Aligning Public Priorities And Allocation Choices, Frankline Muthomi

Public Administration Faculty Publications and Presentations

This study investigates the extent to which individuals exhibit consistency in their preferences during sequential budget simulation exercises, as well as the factors that shape these preferences. Grounded in behavioral and citizen participation frameworks, the analysis demonstrates that the simultaneous use of priority-setting and budget-balancing modules encourages participants to allocate resources in ways that reflect their previously articulated priorities. While instances of inconsistency remain common, preference consistency is associated with participants’ sustained support for their favored programs, their commitment to ensuring adequate resource allocation, and, to some extent, their willingness to finance these programs. The findings suggest that the integrated …

Political Elections In The New Wave Of Media: The Celebrification Of The Presidency, Camille B. Moore

Anthós

This article examines the impact of social media on journalism leading up to the 2024 United States presidential election and how expectations of candidates have changed. By exploring the degradation of discourse in news and how polarization and cognitive biases have intensified with the widespread adoption of social media, previous candidate conventions have begun to crumble. This has, and will continue to have, a large impact on voting and democracy in America, as scholars have noted since the beginning of the 2000’s, in examining a shift in news preferences as pop culture gains influence. This work further examines recent scholarship …

Chatbot Therapy - Help Or Hindrance, Kadi Rae Smith

Anthós

Introduction

Generative artificial intelligence (Gen-AI) chatbots are complex computer programs designed to mimic human conversations using programming that incorporates large language models (LLM) and natural language models (NLM) to simulate human interactions that are being rapidly integrated into everyday life across an increasing amount of online platforms. This article explores the applications and efficacy of chatbots for mental healthcare, from self-directed chatbot interactions to clinician-supervised implementation of chatbot-based therapeutic tools, weighing the benefits and limitations of this ever-expanding technology.

Methodology/Taxonomy

A literature review was conducted primarily using Web of Science, accessed through Portland State University, and Google Scholar, with specifications …

Machine Learning For Economists, John Luke Gallup

Economics Faculty Publications and Presentations

Explication of machine learning algorithms and their usefulness for economic research. The prediction algorithms of Random Forest, Gradient Boost Machines, Neural Networks and Support Vector Machines are built from simple steps applied at large scale to generate surprisingly precise nonlinear estimates. Although useful for processing and interpreting new forms of data, their application to economics research is limited because they do not provide readily interpretable evidence of the causes of outcomes.

Table Of Contents, Lilli B. Rudine

Anthós

No abstract provided.

Erasing The Artist, Policing The City: Michael Stewart And New York’S War On Graffiti, Vladislav Kirilov

Anthós

The 1983 death of Michael Stewart, a young Black graffiti artist, exposes the violent logic at the center of New York City’s War on Graffiti. Under Mayor Ed Koch and the rise of broken windows policing, graffiti was framed as a racialized symbol of disorder used to justify intensified control of public space. Rather than becoming political in this moment, graffiti is understood here as an already politicized form of expression shaped by racial and spatial inequality. The article examines how Stewart’s killing made police violence visible, provoking responses from artists, activists, and graffiti writers while revealing the human costs …

A Guide To Human Ecology Mapping: An Approach For Understanding Human-Environment Connections, Thien-Kim Bui, Rebecca J. Mclain, David Banis, Lee Cerveny

Occasional Papers in Geography

Occasional Papers in Geography Publication No. 9

Places matter to people, and maps can help people and communities share why places matter. Over the past 30 years, public participation GIS (PPGIS) and other forms of human ecology mapping (HEM) have become important ways for agencies, non-governmental organizations, environmental and community advocacy groups, university researchers, and others to learn about or advocate for what matters to people about landscapes they visit, use, or love.

HEM is a method for mapping human-environment interactions and connections. This manual is intended for the planner or practitioner who is interested in using HEM to strengthen …

Scalar Source Localization Using Multi-Sensor Domains Of Dependence In Turbulent Channel Fow, Zejian You, Xiaowei Zhu, Qi Wang

Mechanical and Materials Engineering Faculty Publications and Presentations

Tracking hazardous events such as wildfire smoke, coastal oil spills, or chemical releases in natural environments is complicated by turbulent dispersion and molecular diffusion. This study presents a method to localize pollutant sources rapidly and accurately using infinite time-averaged measurements from a multi-sensor network, leveraging the duality between mean forward and adjoint scalar fields. The forward-adjoint duality states that measurements at the sensor (forward feld) are equal to the adjoint field at the source, providing crucial spatial information about the source. Consequently, the adjoint scalar fields can be interpreted as the domain of dependence for the sensor observations [1, 2]. …

Home Rule, Dillon’S Rule, And The Legal Shape Of Local Governance, Bradon J. Rothschild

National Policy Consensus Center Publications

Public policy in common law democracies such as the United States is dictated by many factors, which you might call streams or strands. While on the one hand the vox populi may insist on a certain action, governing coalitions of political leaders may deign another direction, or policy researchers may conclude a third option is better yet. All such options, however, are constrained by the legal parameters of governance as defined by constitutional, statutory, and case (jurisprudence, or stare decisis) law. Where these streams meet, public policy actions which are popularly supported, politically advantageous, technically effective, and (importantly) legal may …

Heat Misers, Snow Misers, And Cognitive Misers: The 'Nukewarm' Perceptions Of Nuclear Power, Tyler Williams

Dissertations and Theses

Rising energy demand in the United States necessitates alternatives to fossil fuels, yet renewable energy sources alone are insufficient to meet this demand. Nuclear power presents a promising option but faces persistent public hesitancy. This study examines how heuristic-based biases relate to American's risk-benefit perceptions towards nuclear power. Guided by the heuristic-systematic model. Results indicate that competence and affect are related to risk-benefit perceptions, and naturalness shows no relationship with risk perceptions but does correlate with benefit perceptions. Implications highlight the importance of affect-driven communication strategies for nuclear communicators, while also underscoring the need for participatory approaches that foster trust …

Drag’S Impact On Drag Lives, José L. Oropeza Iii

Anthós

Drag’s Impact On Drag Lives

In light of recent political developments where Drag and Trans identities are being punished, why do people still participate in Drag? If there are repercussion to face for being a Drag Queen, then surely it must affect their lives for the better for them to continue the practice.

Through an autoethnographic approach to researching the Portland, OR Drag community, I collected transcripts of conversations with local Queens, took notes of community interactions, and put myself in Drag for the first time as a Queer man to better understand the Drag community and why they Drag. …

Creating Community Through Walking The Talk For Dementia, Kate Irving, Fernando Aguzzoli Peres, Walter D. Dawson, Jonathan Adrián Zegarra-Valdivia, Lingani Mbakile-Mahlanza, Iracema Leroi, Sherril B. Gelmon

Institute on Aging Publications

Objectives

Creating community is not only therapeutic—it has been described as essential. This study explores a process of community-building among people with lived and professional experience in the dementia field, during Walking the Talk for Dementia (WTD), a week-long, immersive event on the Camino de Santiago in Spain. Absence of community can lead to fragmented support for both people living with dementia and their care partners and for those working in the field. Achieving a sense of community, however, can be complex.

Methods

A qualitative evaluation was conducted with 79 participants from 27 countries, incorporating pre-, during and post-event reflections. …

Pathos, Winter 2026, Portland State University. Student Publications Board

Pathos

Editor: Adriana Stanzione

Density Dependence During Evolutionary Rescue Increases Extinction Risk But Does Not Prevent Adaptation, Laure Olazcuaga, Brett A. Melbourne, Scott W. Nordstrom, Ruth A. Hufbauer

Publications, Reports and Presentations

Evolutionary rescue allows populations to adapt and persist despite severe environmental change. While well studied under density-independent conditions, the role of density dependence, including competition, remains unclear. Theoretical models offer conflicting predictions, with density dependence either increasing extinction risk or enhancing adaptation. We empirically tested how density dependence influences evolutionary rescue by exposing experimental populations to a stressful environment for six generations under density-dependent or independent conditions, with populations where either evolution was possible or was prevented by replacing individuals each generation. Density dependence suppressed population size and increased extinction risk, whereas density independence enabled rapid growth, especially in genetically …

Women's Social Roles And Alcohol Use Among Military-Connected Spouses, Sheila Kathleen Mccabe Nickerson

Dissertations and Theses

Increases in women's alcohol use are an intensifying public health problem in the United States, contributing to a hidden epidemic of alcohol-related mortality. Women's alcohol consumption is often not openly discussed or recognized due to social stigma, the perception that women drink less than men, and the fact that women can experience negative health consequences from lower levels of alcohol consumption (relative to men), making the issue less visible than it actually is. A range of factors potentially influence women's drinking, including social roles (i.e., mother); yet, the literature is varied as to whether the combination of multiple-role demands/expectations fosters …

"I Like The Idea In Theory": Experiencing The Imperial Matrix Through Legal Gender Marker Changes And Nonbinary Disidentifications, Wynn Strange

Dissertations and Theses

Since 2018 twenty-two states and the District of Columbia have implemented administrative changes that provide a third gender option on at least one state identification document allowing nonbinary and intersex people the opportunity to select a gender marker that reflects their gender identity. This study draws from 28 interviews with agender or otherwise nonbinary people living in Maryland and California. I use queer of color and critical trans theory to consider the implications of legal gender marker changes. This research explores how social, historical, and geographical location can influence ones' awareness of, experiences with, and relation to real and imagined …

Lattice Thermal Transport Beyond The Quasiparticle Approximation: Nontrivial Spectral Competition Between Three- And Four-Phonon Interactions, Yi Xia

Mechanical and Materials Engineering Faculty Publications and Presentations

The breakdown of the quasiparticle approximation (QPA) for phonons in strongly anharmonic materials necessitates advanced first-principles frameworks for accurate lattice dynamics and thermal transport predictions. We develop a comprehensive beyond-quasiparticle approximation (BQPA) approach incorporating both three- (3ph) and four-phonon (4ph) interactions and apply it to investigate lattice thermal conductivity (κL) in MgO, PbTe, and AgCl – materials that span a broad spectrum of anharmonicity, from weak to severe anharmonic regimes with overdamped phonons. We reveal that while BQPA consistently increases κL relative to QPA due to phonon softening when considering only 3ph interactions, the inclusion of additional 4ph interactions hardens …