Digital Commons Network^™

Regiongrow3d: A Deterministic Analysis For Characterizing Discrete Three-Dimensional Landslide Source Areas On A Regional Scale, Nicolas W. Mathews, Ben A. Leshchinsky, Benjamin B. Mirus, Michael J. Olsen, Adam M. Booth

Geology Faculty Publications and Presentations

Regional-scale characterization of shallow landslide hazards is important for reducing their destructive impact on society. These hazards are commonly characterized by (a) their location and likelihood using susceptibility maps, (b) landslide size and frequency using geomorphic scaling laws, and (c) the magnitude of disturbance required to cause landslides using initiation thresholds. Typically, this is accomplished through the use of inventories documenting the locations and triggering conditions of previous landslides. In the absence of comprehensive landslide inventories, physics-based slope stability models can be used to estimate landslide initiation potential and provide plausible distributions of landslide characteristics for a range of environmental …

Understanding Travel Behavior And Accessibility For Older Adults: A Comprehensive Framework, Andy Hong, Cathy Liu, Ja Young Kim, Zihao Wen

TREC Final Reports

This study used a mixed-method design to examine travel behavior and accessibility of older adults. The research team conducted a statewide survey and focus groups to gather travel behavior data of older adults (50+) residing in Utah. The study also employed a two-step floating catchment area method, a novel spatial technique, and integrated the survey data to accurately measure travel accessibility of older adults. Using the survey data of 724 older adults as well as the focus group interviews of 18 older individuals, we found a significant dissatisfaction and vulnerability experienced by older adults with limited mobility. The distribution patterns …

Second International Marxism And The Finnish Revolution, Luke Brodersen

University Honors Theses

This paper will consider the Finnish revolution of 1917-1918 as it was understood by Second International Marxists--not because these Marxists were right, but because the revolution was led by Marxists of a socialist party formed in the Second International. By dint of the constraints of time, of resources, and of a language barrier, this paper cannot be an exhaustive historical account of the activities of the Finnish socialists, nor a comprehensive explanation of Marxism, nor would it assume to provide a proper 'Marxist' analysis of this history. Of the two 20th century English language histories of this revolution--the work of …

Machine Learning Framework For Predicting Reliability Of Solder Joints, Robert Lee Jones

Dissertations and Theses

This paper presents the techniques and framework to produce an explainable machine learning model for predicting the reliability of solder joints exposed to thermal cycle testing. While machine learning techniques have become prevalent for many engineering and data analysis tasks, the complexity of the model occludes valuable information which can be used to refine the data, tune model parameters, and aid in scientific discovery. By exposing the relationships within the model, users can have greater confidence in the use and employment of it. The purpose of this study is to show how useful relationships can be obtained from a traditional …

Single-Stage Three-Phase Buck-Boost Dc/Ac Converter Design, Analysis, And Validation, Daisy Delgado-Zaragoza

Dissertations and Theses

Three-phase DC/AC power converters enable several applications including photovoltaic systems, electric traction inverters, uninterruptible power supplies, and utility systems. The classical three-phase voltage source inverter (VSI) topology only operates in voltage step-down or buck mode of operation. Increasing number of applications including transformer-less photovoltaic systems, battery cells, fuel cells, and traction motors require a wide range of input and output voltage range. Therefore, a DC/AC power converter topology capable of voltage buck and boost operation will enable wider operating range resulting in efficient and higher performance system designs. This thesis presents a single-stage bidirectional power flow DC/AC inverter topology capable …

Oregon State Rank Assessment For Salamander Slug (Gliabates Oregonius), Eleanor P. Gaines

Institute for Natural Resources Publications

Oregon state conservation status assessment for salamander slug (Gliabates oregonius) using NatureServe methodology, 2024.

Application Of Participatory Process Mapping To Evaluate Environmental Decision-Making And Implementation, Karissa Courtney, Emily Rabung, Jennifer Brousseau, Antony S. Cheng, A. Paige Fischer, Harrison Fried, Matthew Hamilton, Federico Holm, Jordan Inskeep, Max Nielsen-Pincus, Multiple Additional Authors

Environmental Science and Management Faculty Publications and Presentations

Environmental governance outcomes hinge on the design and implementation of management decisions. Yet, available research methodologies can be limited in their ability to capture the complexity of decision-making and implementation processes and in turn predict and explain environmental governance outcomes. We present participatory process mapping as a method for examining the pathways that emerge and evolve over time that result in natural resource management decisions and on-the-ground outcomes, as perceived by participants in collaborative processes. The approach leverages a large-N comparative design, participatory diagraming within semi-structured interviews, and mental modeling toward a method that can fit into both quantitative and …

Matrix-Free High-Performance Saddle-Point Solvers For High-Order Problems In H (Div), Will Pazner, Tzanio Kolev, Panayot S. Vassilevski

Mathematics and Statistics Faculty Publications and Presentations

This work describes the development of matrix-free GPU-accelerated solvers for high-order finite element problems in . The solvers are applicable to grad-div and Darcy problems in saddle-point formulation, and have applications in radiation diffusion and porous media flow problems, among others. Using the interpolation–histopolation basis (cf. [W. Pazner, T. Kolev, and C. R. Dohrmann, SIAM J. Sci. Comput., 45 (2023), pp. A675–A702]), efficient matrix-free preconditioners can be constructed for the -block and Schur complement of the block system. With these approximations, block-preconditioned MINRES converges in a number of iterations that is independent of the mesh size and polynomial degree. The …

How Can Dei Training Change The Culture Of An Organization To Achieve Belonging And Retain Diverse Employees?, Kaisa S. Holt

University Honors Theses

Studies show the need for innovation and higher productivity yields can be best achieved through workforce heterogeneity. Creating effective DEI training frameworks is crucial for belonging, sustainable social well-being and enacting real change. This is key to proactively shifting our current system from one that responds to the need for DEI on a surface level to something that is regenerative. The aim of this review is to evaluate characteristics and enhancements added to evidence-based DEI training between 2020 and 2024. Studies were identified using the Portland State advanced database of academic journals on the DEI training and impacts of the …

The Delicate Situation Of Childhood Vaccination: On The Dispreferredness Of Soliciting Parents' Intent To Vaccinate, Robert Prettner, Hedwig Te Molder, Jeffrey D. Robinson

Communication Faculty Publications and Presentations

In the Netherlands, parents of newborns typically participate in two-, four-, and eight-week medical consultations to monitor their children’s development and discuss vaccinations, which will not be administered before eight weeks. During these visits, healthcare professionals routinely ask parents if they intend to vaccinate their children (i.e. to participate in the National Immunization Program). Using Conversation Analysis, we examine 62 videotaped consultations and present two lines of evidence to argue that the sequence initiated by professionals wherein they solicit parents’ intent to vaccinate is dispreferred. First, this action is routinely deferred by preliminary sequences. Second, when professionals eventually initiate this …

A Configurable Real-Time Event Detection Framework For Power Systems Using Swarm Intelligence Optimization, Umar Farooq, Midrar Adham, Mohammed Alsaid, Robert B. Bass

Electrical and Computer Engineering Faculty Publications and Presentations

Power system balancing authorities are routinely affected by sudden frequency fluctuations. These frequency events can take the form of negligible frequency deviations or more severe emergencies that can precipitate cascading outages, depending on the severity of the disturbance and efficacy of remedial action schema. It is imperative to arrest such disturbances quickly by activating primary frequency control measures. This manuscript proposes a configurable event detection framework using optimization methods to tune a detection algorithm to detect events as specified by experts from a Balancing Authority. The utility of the detection framework is demonstrated using a regression-based frequency event detection algorithm …

Extended Time, Elevated Expectations: The Unappreciated Downsides Of Pausing The Tenure Clock, Maria A. Holland, Katharina Maisel, Carolyn B. Ibberson, Laura K. Wiley, David C. Burnett, Emily M. Mace, Mary Williard Elting

Electrical and Computer Engineering Faculty Publications and Presentations

In 1971, Stanford became the first university to introduce tenure clock extensions in academia for new mothers. The American Association of University Professors (AAUP) began recommending such policies a few years later, and in 2001, modified their recommendation to include primary or coequal caregivers, following either the birth or adoption of a child (1). By 2004, 43% of 255 surveyed institutions had formal clock-stop policies...

The Experience Of Homelessness And Its Effects On Gut Eubiosis, Kamerin Villagomez

University Honors Theses

Microorganisms which populate the human gastrointestinal tract (GIT) have a profound effect on overall human health. The relationship between host health and eubiosis, or balance, of the GIT microbiome is symbiotic and can have reciprocal relationships with quality of sleep, quality of diet, stress and mental health, and the experience of pain. These specific aspects of health are unique in populations experiencing homelessness due to the multi-dimensional and complex nature of their lived experience. Very few studies explore populations experiencing homelessness, with even fewer investigating the intersection between this population and the human GIT microbiome. It is important to do …

Social Media And Perceptions Of Supreme Court Legitimacy, Ryan Stadler

University Honors Theses

This thesis observed how information sources may have a polarizing effect on perceptions of Supreme Court legitimacy. The focus of the study was to measure whether social media had a stronger effect on peoples' perception of Supreme Court legitimacy when compared to other forms information sources. This study may significantly determine how support for the Supreme Court can fluctuate depending on both the platform of information distribution and the content of the information. This study used an anonymous survey to canvas sentiment about the Supreme Court in the Portland Metro Area. The initial findings suggest that those who use social …

Caregiver Perceptions Of Antipsychotic Drug Use In Dementia Populations: Investigating How Antipsychotic Medications Are Overused, Alexis Wellman

University Honors Theses

Antipsychotic drugs have been strongly suggested by many authors to cause great harm to those with dementia. Yet, they are still used in an overabundance in memory care facilities. Caregivers, who spend the most time with residents, often decide when and why people with dementia receive antipsychotic drugs. By examining the background of the relationship between antipsychotic drugs and the dementia population, it is clear that caregivers need more education on antipsychotic medications, better staffing on the average shift, more administrative support to handle medication orders and changes, and better laws and regulations to better reduce the amount of antipsychotic …

Lsp Needs Analysis In The Context Of International Minor League Baseball, Julia Moore

University Honors Theses

Examining the language and cultural needs of international minor league baseball players through the lens of English for Specific Purposes (ESP) this study utilizes applied linguistics and sports sociology and aims to inform player development strategies to enhance on- and off-field communication. Survey data was gathered on language use preferences, focusing on players' attitudes and behaviors in professional settings. Ethical considerations included surveys in English and Spanish and voluntary participation, with data collected at the Oakland Athletics Complex in Mesa, Arizona, from 18 out of 20 players.

Findings reveal that players recognize the importance of English proficiency for effective gameplay …

The Basic Dualism In The World: Object-Oriented Ontology And Systems Theory, Martin Zwick

Complex Systems Faculty Publications and Presentations

Graham Harman writes that the “basic dualism in the world lies…between things in their intimate reality and things as confronted by other things.” However, dualism implies irreconcilable difference; what Harman points to is better expressed as a dyad, where the two components imply one another and interact. This article shows that systems theory has long asserted the fundamental character of Harman’s dyad, expressing it as the union of internal structure and external function, which correspond exactly to what Levi Bryant, characterizing Harman’s views, refers to as the intra-ontic and the inter-ontic, respectively. After interpreting Harman’s dyad in terms of the …

Supportive-Leadership Training To Improve Social Connection: A Cluster-Randomized Trial Demonstrating Efficacy In A High-Risk Occupational Context, Cynthia Mohr, Leslie Hammer, Jennifer Dimoff, Shalene Allen, James Lee, Sarah Arpin, Sheila Mccabe, Krista Brockwood, Todd Bodner, Luke Mahoney, Multiple Additional Authors

Psychology Faculty Publications and Presentations

The high, and rate of loneliness is a threat to public health (Office of the Surgeon General, 2023), with negative mental and physical health consequences (e.g., Holt-Lunstad, 2021). Given that loneliness is a risk factor for poor mental health, efforts to address loneliness are urgently needed. Workplaces can facilitate an employee's social connection through supervisor support training, which can help mitigate loneliness. Among occupational groups, the military is at higher risk for mental health disorders, suicide, and loneliness (Fikretoglu et al., 2022; Naifeh et al., 2019). This study evaluated the efficacy of an evidence-based supportive-leadership training intervention targeting active-duty U.S. …

Ronald E. Mcnair Scholars Program Profiles And Abstracts 2024, Mcnair Scholars Program

McNair Symposium

This is the complete event program and provides presentation abstracts and biographies of McNair scholars and their mentors.

Layered Naba2m3q3(Q2) (M = Cu Or Ag; Q = S Or Se) Chalcogenides And Local Ordering In Their Mixed-Anion Compositions, Ayat Tassanov, Huiju Lee, Yi Xia, James M. Hodges

Mechanical and Materials Engineering Faculty Publications and Presentations

Three new NaBa2M3Q3(Q2) (M = Ag or Cu; Q = S or Se) chalcogenides were prepared by using solid-state methods and structurally characterized by using single-crystal X-ray diffraction. NaBa2Ag3Se3(Se2) and NaBa2Cu3Se3(Se2) crystallize in monoclinic space group C2/m and have a two-dimensional structure composed of edge-sharing MSe4/4 tetrahedra separated by Na+ and Ba2+ cations, along with (Se2)2– dimers at the center of the spacings between [M3Se3]3– slabs. NaBa2Ag3S3(S2) adopts a related structure with space group C2/m but has additional, crystallographically distinct Ag atoms in the [Ag3S3]3– layer that are linearly coordinated. NaBa2Ag3Se3(Se2) and NaBa2Ag3S3(S2) have indirect band gaps measured to be …

Introducing Isomad, A Compilation Of Isotopic Datasets For Madagascar, Sean W. Hixon, Ricardo Fernandes, Antonin Andriamahaihavana, Andrea L. Baden, Marina B. Blanco, Guillaume Caulier, Melanie Dammhahn, Igor Eeckhaut, Timothy M. Eppley, Natalie Vasey, Multiple Additional Authors

Anthropology Faculty Publications and Presentations

Abstract We present the first open-access, island-wide isotopic database (IsoMad) for modern biologically relevant materials collected on Madagascar within the past 150 years from both terrestrial and nearshore marine environments. Isotopic research on the island has increasingly helped with biological studies of endemic organisms, including evaluating foraging niches and investigating factors that affect the spatial distribution and abundance of species. The IsoMad database should facilitate future work by making it easy for researchers to access existing data (even for those who are relatively unfamiliar with the literature) and identify both research gaps and opportunities for using various isotope systems to …

Altered Disturbance Regimes And Novel Ecosystems: Understanding And Managing Ecosystem State Change In The Forest-Peatland Ecotone Of Western Patagonia, Kyla Sara Zaret

Dissertations and Theses

Altered fire regimes, combined with a warmer and drier climate, have been eroding the resilience of temperate rainforests and peatlands worldwide and leading to alternative post-fire vegetation communities. I used a social-ecological systems framework informed by theories of non-linear ecosystem dynamics on the one hand and political ecology and 'politics of scale' scholarship on the other to investigate, 1) the underlying causes of a shift in vegetation dominance from forests dominated by the conifer, Pilgerodendron uviferum, to peat-generating ecosystems dominated by the peat moss, Sphagnum magellanicum; and 2) what this means for the futures of local people's livelihoods …

Put The Vanc Down, Flip It And Reverse It: Comparison Of Vancomycin And Daptomycin Health Care Utilization And Cost In Outpatient Parenteral Antimicrobial Therapy, Amber C. Streifel, Katie Luis, Monark Nakrani, Diana Yu, Monica K. Sikka, Cara D. Varley, Alyse Douglass, Heather Mayer, Kathleen Young, James S. Lewis Ii

OHSU-PSU School of Public Health Faculty Publications and Presentations

Vancomycin and daptomycin are frequently used in outpatient parenteral antimicrobial therapy (OPAT). We analyze health care utilization and cost to the health care system for vancomycin vs daptomycin in the outpatient setting and find that vancomycin results in significantly higher health care utilization and similar cost per course compared with daptomycin in OPAT.

Agnotology Of The E-Cigarette Industry: How The E-Cigarette Industry Continues The Tobacco Industry's Legacy Of Creating Controversy And Confusion Within The Scientific Community And The General Population, Calvin Lewis

University Honors Theses

The purpose of this paper is to determine the extent to which the e-cigarette industry follows in the footsteps of the tobacco industry's attempts to disrupt science and cause controversy. Four tactics are described that the tobacco industry uses to disrupt science: funding research that is designed to show results that support their position, criticizing and suppressing research that goes against their position, changing risk assessment and scientific research standards to fit their aims, and spreading data created by their interest groups to politicians and the nonacademic press. Evidence is found to show that both the tobacco industry and e-cigarette …

Oregon State Rank Assessment For False Naked Wild-Buckwheat (Eriogonum Novonudum), Nora Dunkirk

Institute for Natural Resources Publications

Oregon state conservation status assessment for False Naked Wild-buckwheat (Eriogonum novonudum) using NatureServe methodology, 2024.

Binary Gendered Language: A Qualitative Study Of Psu Students, Dakota Abercrombie

University Honors Theses

This study explores experiences of gendered language in use in academia among two marginalized groups: women and those identifying beyond the gender binary. Guided by the theory of linguistic relativity this study attempts to understand specific ways in which gendered language, including generic language may show up and contrasted within these groups. While this data is not generalizable, the findings indicate that both women and nonbinary students experience binary pronoun use in written formats such as syllabi. However, nonbinary students describe more negative feelings associated with this experience. We also noted participants' gender identities intersecting with other identities, leading to …

Exploration Of Large-Scale Vegetation Transition In Wet Ecosystems: A Comparison Of Conifer Seedling Abundance Across Burned Vs. Unburned Forest-Peatland Ecotones In Western Patagonia, Kyla Zaret, Andres Holz

Geography Faculty Publications and Presentations

Altered fire regimes, combined with a warmer and drier climate, have been eroding the resilience of temperate rainforests and peatlands worldwide and leading to alternative post-fire vegetation communities. Chronic anthropogenic burning of temperate rainforests at the forest-peatland ecotone in western Patagonia appears to have shifted vegetation communities in poorly-drained sites from forests dominated by the threatened conifer, Pilgerodendron uviferum, to peat-accumulating wetlands covered by Sphagnum mosses. We collected and modeled post-reburn field data using ordinations and hierarchical Bayesian regressions to examine mechanisms through which P. uviferum forests may recover following fire or become locked into alternative development pathways by comparing …

A Native American Perspective On Navigating The Academic World With Resilience And Honoring The Wisdom Of Native Elders, Shani Renee Johnson

Dissertations and Theses

The graduation percentage among Native American students has consistently remained at a discouraging 50 %, both in the past and at present. This study employed a narrative inquiry approach to investigate the low graduation rates among Native American students, from the perspective of a Native American educator and mother. This study examined the historical trauma and colonization experienced by Native Americans and how it has affected Native American families and communities, resulting in low rates of graduation among Native students. In addition, this study examined factors contributing to resilience by acknowledging Traditional Ecological Knowledge (TEK) and Indigenous Ways of Knowing …

Reflecting On The Quality Of A Methodologically Pluralist Evaluation Of A Large-Scale Indigenous Health Research Collaboration In Australia, Jodie Bailie, Veronica Matthews, Alison Frances Laycock, Kathleen Conte, Lynette Feeney, Roxanne Bainbridge

OHSU-PSU School of Public Health Faculty Publications and Presentations

Indigenous communities worldwide lead calls for all evaluations of research, programmes and policies affecting their communities to reflect the values, priorities and perspectives of the Indigenous peoples and communities involved. Tools, such as the Quality Appraisal Tool (QAT), are available to assess research quality through an Indigenous cultural lens. Good evaluation requires that evaluation efforts be evaluated. We found that critical reflection on the quality of evaluations from an Indigenous perspective is largely absent from the published literature. To ensure that we strive for quality in evaluation as determined by Indigenous people with whom we work, we examined the quality …

Comparing The Performance Of Different Missing Data Imputation Approaches In Discrete Outcome Modeling, Md Istiak Jahan, Tanmoy Bhowmik, Lauren Hoover, Naveen Eluru

Civil and Environmental Engineering Faculty Publications and Presentations

Although several approaches exist for data imputation, these approaches are not commonly applied in transportation. The current paper is geared toward assisting transportation researchers and practitioners in developing models using datasets with missing data. The study begins with a data simulation exercise evaluating different solutions implemented for missing data. The dimensions considered in our analysis include: the nature of independent variables, different types of missing variables, different shares of missing values, multiple data sample sizes, and evaluation of single imputation (SI), multiple imputation (MI) and complete case data (CCD) approach. The comparison is conducted by adopting the appropriate inference process …