Digital Commons Network^™

Multi-Tasking Memcapacitive Networks, Dat Tran, Christof Teuscher

Electrical and Computer Engineering Faculty Publications and Presentations

Recent studies have shown that networks of memcapacitive devices provide an ideal computing platform of low power consumption for reservoir computing systems. Random, crossbar, or small-world power-law (SWPL) structures are common topologies for reservoir substrates to compute single tasks. However, neurological studies have shown that the interconnections of cortical brain regions associated with different functions form a rich-club structure. This structure allows human brains to perform multiple activities simultaneously. So far, memcapacitive reservoirs can perform only single tasks. Here, we propose, for the first time, cluster networks functioning as memcapacitive reservoirs to perform multiple tasks simultaneously. Our results illustrate that …

Chemical Interactions And Cytotoxicity Of Terpene And Diluent Vaping Ingredients, Yanira Baldovinos, Alexandra Archer, James C. Salamanca, Robert M. Strongin, Christie Sayes

Chemistry Faculty Publications and Presentations

Vaping devices have risen in popularity since their inception in 2007. The practice involves using a variety of commercially available devices. Internal heating systems in devices aerosolize e-liquid formulations of complex mixtures including an active ingredient (e.g., THC, CBD, and nicotine), diluents (or cutting agents), solvents, and flavoring agents (e.g., terpenes and aldehydes). The vaping toxicology literature consists of cytotoxicity studies of individual chemicals and commercial formulas. Because of the variation of e-liquid composition, there is a limited understanding of the toxicity of ingredient combinations. This study analyzed the cytotoxic effects after exposure to individual and binary mixtures of a …

Pathos, Fall 2022, Portland State University. Student Publications Board

Pathos

Editor: Bret Steggell

Raps Sheet, October 2022, Retirement Association Of Portland State

RAPS Sheet: Monthly Newsletter

No abstract provided.

Portland State Magazine, Portland State University. Office Of University Communications

Portland State Magazine

PSU’s alumni magazine, published 2-3 times a year. In this issue: Portland State mobilizes for the next era of climate action; with perseverance and a little help, it’s never too late to graduate; three scientists answer the question: How do you stay hopeful and motivated to make a difference with climate change?; Portland State researchers are investigating how to help the most vulnerable parents; opera retakes the stage with the “Merry Wives of Windsor”; a record-breaking steeplechase runner finds his way; remembering Charles Moose, Portland's first Black police chief, and more.

Accessing Opportunities For Household Provisioning Post-Covid-19, Kelly Clifton, Amanda Howell, Kristina M. Currans, Gabriella Abou-Zeid, Max Nonnamaker, Paula C. Carder

TREC Final Reports

In this project, we used a mixed-methods study to collect critical information to evaluate the extent to which people modified their shopping behavior, either by choice or necessity, to meet their provisioning needs during the COVID-19 crisis and the following recovery. First, four waves of a cross-sectional survey were administered online to a representative sample of households in Arizona, Florida, Michigan, Oregon, and Washington. This longitudinal, comparative study responded directly to a critical research gap and advanced behavioral science by providing a rich survey dataset to support and test theories of behavioral change and technology adoption. Second, focus groups were …

A Profile Of Freshman Inquiry Students Fall 2022, Portland State University. University Studies Program, Rowanna L. Carpenter

University Studies Assessment Research

In order to better understand the students who enroll in Freshman Inquiry (FRINQ) courses and identify areas where they may need support, University Studies (UNST) began collecting and compiling data on these students. This report presents a profile of FRINQ students from Fall 2022. It presents an overview of all students enrolled in FRINQ during Fall 2022 and then summarizes information from the Prior Learning Survey. It is organized around three areas that contribute to student success: academic preparation and concern; financial and physical wellbeing; and connectedness to campus.

Exploring Transnational Dimensions Of Activism In Contemporary Book Culture, Rachel Noorda, Corinna Norrick-Rühl, Elizabeth Le Roux

English Faculty Publications and Presentations

The board book A is for Activist is an ABC children’s title written and illustrated by Innosanto Nagara, an Indonesian social justice graphic designer living in the United States. The title started out as a self-published book crowdfunded on Kickstarter for his own child in 2012, was then picked up by independent publisher Seven Stories Press, and has since achieved bestselling sales status. While originally published in English, it has been translated and sold all over the world, including by Seven Stories’ Spanish-language imprint Siete Cuentos, in an edition with Martha Gonzalez’s translation and an audio version from guitarist and …

Ethyl Maltol, Vanillin, Corylone And Other Conventional Confectionery-Related Flavour Chemicals Dominate In Some E-Cigarette Liquids Labelled ‘Tobacco’ Flavoured, Esther E. Omaiye, Wentai Luo, Kevin J. Mcwhirter, James F. Pankow, Prue Talbot

Civil and Environmental Engineering Faculty Publications and Presentations

Background The increased popularity of electronic cigarettes (e-cigarettes) has been linked to the abundance of flavoured products that are attractive to adolescents and young adults. In the last decade, e-cigarette designs have evolved through four generations that include modifications in battery power, e-cigarette liquid (e-liquid) reservoirs and atomiser units. E-liquids have likewise evolved in terms of solvent use/ratios, concentration and number of flavour chemicals, use of nicotine salts and acids, the recent increased use of synthetic cooling agents and the introduction of synthetic nicotine. Our current objective was to evaluate and compare the evolving composition of tobacco-flavoured e-liquids over the …

Stable Coexistence Or Competitive Exclusion? Fern Endophytes Demonstrate Rapid Turnover Favoring A Dominant Fungus, Brett Steven Younginger, Nathan U. Stewart, Mehmet Ali Balkan, Daniel J. Ballhorn

Biology Faculty Publications and Presentations

Fungal endophytes are critical members of the plant microbiome, but their community dynamics throughout an entire growing season are underexplored. Additionally, most fungal endophyte research has centred on seed-reproducing hosts, while spore-reproducing plants also host endophytes and may be colonized by unique community members. In order to examine annual fungal endophyte community dynamics in a spore-reproducing host, we explored endophytes in a single population of ferns, Polystichum munitum, in the Pacific Northwest. Through metabarcoding, we characterized the community assembly and temporal turnover of foliar endophytes throughout a growing season. From these results, we selected endophytes with outsized representations in …

How Do Changes In Family Role Status Impact Employees? An Empirical Investigation, Matthew B. Perrigino, Ellen Ernst Kossek, Rebecca J. Thompson, Todd Bodner

Psychology Faculty Publications and Presentations

Purpose – Despite the proliferation of work–family research, a thorough understanding of family role status changes (e.g. the gaining of elder or child caregiving responsibilities) remain under-theorized and under-examined. The purpose of this paper is to conceptualize various forms of family role status changes and examine the ways in which these changes influence various employee outcomes.

Design/methodology/approach – Data were collected as part of the work–family health study. Using a longitudinal, three-wave study with two-time lags of 6 months (n = 151 family role status changes; n = 392 individuals with family role stability), this study uses one-way analysis of …

Association Between State Regulations Supportive Of Third-Party Services And Likelihood Of Assisted Living Residents In The Us Dying In Place, Emmanuelle Belanger, Nicole Rosendaal, Joan M. Teno, David M. Dosa, Pedro L. Gozalo, Paula Carder, Kali S. Thomas

Institute on Aging Publications

Importance Older adults are increasingly residing in assisted living residences during their last year of life. The regulations guiding these residential care settings differ between and within the states in the US, resulting in diverse policies that may support residents who wish to die in place.

Objective To examine the association between state regulations and the likelihood of assisted living residents dying in place. The study hypothesis was that regulations supporting third-party services, such as hospice, increase the likelihood of assisted living residents dying in place.

Design, Setting, and Participants This retrospective cohort study combined data about assisted living residences …

Increased Panel Height Enhances Cooling For Photovoltaic Solar Farms, Sarah E. Smith, Bianca Viggiano, Naseem Ali, Timothy J. Silverman, Martin Obligado, Marc Calaf, Raul Bayoan Cal

Mechanical and Materials Engineering Faculty Publications and Presentations

Solar photovoltaic (PV) systems suffer substantial efficiency loss due to environmental and internal heating. However, increasing the canopy height of these systems promotes surface heat transfer and boosts production. This work represents the first wind tunnel experiments to explore this concept in terms of array flow behavior and relative convective heat transfer, comparing model solar arrays of varied height arrangements - a nominal height, extended height, and a staggered height configuration. Analyses of surface thermocouple data show average Nusselt number (𝑁𝑢) to increase with array elevation, where panel convection at double height improved up to 1.88 times that of the …

Port Of Portland’S Marine Terminal 6 Contribution To Regional Economic Development, Lewison Lem

PSU Transportation Seminars

Container cargo shipping service returned to the Port of Portland in Oregon in January 2020 with the regular weekly SM Line service, following more than three years of no container shipping service. Following the global supply chain changes associated with COVID -19, the number of monthly vessel calls at the Port of Portland’s deep-water berth at Terminal 6 has increased regularly to 12 vessel calls in January of 2022. In March of 2022, the largest containership to transit the Columbia river – at 1,100 feet length with capacity of 8,200 containers – arrived at the Port of Portland.

The return …

Recommendations For Medical And Mental Health Care In Assisted Living Based On An Expert Delphi Consensus Panel A Consensus Statement, Sheryl Zimmerman, Philip D. Sloane, Christopher J. Wretman, Kevin Cao, Johanna Silbersack, Paula Carder, Kali S. Thomas, Josh Allen, Kim Butrum, Multiple Additional Authors

Institute on Aging Publications

Importance Assisted living (AL) is the largest provider of residential long-term care in the US, and the morbidity of AL residents has been rising. However, AL is not a health care setting, and concern has been growing about residents’ medical and mental health needs. No guidance exists to inform this care.

Objective To identify consensus recommendations for medical and mental health care in AL and determine whether they are pragmatic.

Evidence Review A Delphi consensus statement study was conducted in 2021; as a separate effort, the extent to which the recommendations are reflected in practice was examined in data obtained …

Portland State And The Downtown Portland Plan - 50 Years Later With Ethan Seltzer, Ethan Seltzer

PDXPLORES Podcast

Fifty years ago, the City of Portland developed a plan for the downtown corridor with a radical vision of what a central city could be. The downtown we know today is the result of that plan. In this episode of PDXPLORES, Professor Emeritus Ethan Seltzer discusses the 1972 downtown plan and how Portland State evolved into an urban-serving university alongside the downtown corridor.

Click on the "Download" button to access the accompanying article Portland, Portland State, and the Urban University Idea.

Transcript for audio below as additional file.

Link to city archive documents

https://pdxscholar.library.pdx.edu/oscdl_cityarchives/

Not The Same Cure: Student Experiences In Course-Based Undergraduate Research Experiences Vary By Graduate Teaching Assistant, Emma C. Goodwin, Jessica R. Cary, Erin E. Shortlidge

Biology Faculty Publications and Presentations

To expose all undergraduate science students to the benefits of participating in research, many universities are integrating course-based undergraduate research experiences (CUREs) into their introductory biology laboratory curriculum. At large institutions, the bulk of introductory labs are instructed by graduate teaching assistants (GTAs). Graduate students, who are often teachers and researchers in training, may vary in their capacity to effectively teach undergraduates via the CURE model. To explore variation in GTA teaching and the subsequent outcomes for students, we used a case study research design at one institution where introductory biology students participate in GTA-taught CURE lab sections. We used …

Short Warm-Side Wet-Bulb Temperature Distribution Tails Lead To Accelerated Increases In Extreme Threshold Exceedances Under Global Warming, Yianna Sotirios Bekris

Dissertations and Theses

Humid-heat extremes threaten human health and are increasing in frequency with global warming, so elucidating factors affecting their rate of change is critical. This thesis examines the role of historical (1985-2014) wet-bulb temperature distribution tail shape on the probability of wet-bulb temperature extreme threshold exceedances under 2°Celsius global warming. Analysis of global climate models and reanalysis reveals that non-Gaussian wet-bulb temperature distribution tails are common worldwide across extensive, spatially coherent regions. More rapid increases in the number of days exceeding the historical 95th percentile are projected in locations with shorter-than-Gaussian warm-side tails. Of the two primary components of wet-bulb temperature, …

Arts For Whose Sake? Arts Course-Taking And Math Achievement In Us High Schools, Daniel Mackin Freeman, Dara Shifrer

Sociology Faculty Publications and Presentations

Math achievement in U.S. high schools is a consistent predictor of educational attainment. While emphasis on raising math achievement continues, school-level interventions often come at the expense of other subjects. Arts courses are particularly at risk of being cut, especially in schools serving lower socioeconomic status youth. Evidence suggests, however, that arts coursework is beneficial to many educational outcomes. We use data on 20,590 adolescents from the High School Longitudinal Study of 2009 to answer two research questions: (1) Does student accumulation of fine arts courses across different topic areas relate positively to math test scores in high school? (2) …

50 Years And Counting: Why Environmental Preservation Is Embedded In Oregon Culture, Carl Abbott

Urban Studies and Planning Faculty Publications and Presentations

In the years following World War II, suburban growth began consuming Willamette Valley farmland. Increasingly affluent families were snapping up vacation properties with mountain and ocean views. Oregonians in the latter half of the 1960s responded with conferences, reports and finger-wagging at the bad example of California. In 1969, the legislature acted with Senate Bill 10. The legislation established land-use regulation as a state concern, requiring local governments to develop land-use plans in line with 10 statewide goals. The intention was good, but the measure lacked teeth for monitoring and enforcement. McCall promised to fix the problems when he ran …

Statistical Inference For Multimodal Travel Time Reliability, Avinash Unnikrishnan, Miguel Figliozzi, Subhash C. Kochar

TREC Final Reports

Travel time reliability is a key metric of interest to practitioners and researchers because it affects travel choice and the economic competitiveness of urban areas. This research focuses on three travel time reliability metrics – buffer index, modified buffer index, and the relative width of travel time distributions. The key novel contributions of this research include using the multivariate delta method to prove that the sampling distributions of the three travel time reliability metrics are asymptotically normal. The asymptotic standard error for the three reliability metrics is derived. The asymptotic normality and the standard error result are used to arrive …

An Assessment Model Of The Healthcare Entrepreneurship Ecosystem To Foster Solutions For Underserved Communities, Abdalilah Saleh Owaishiz

Dissertations and Theses

There are significant disparities in access to healthcare treatment and this study investigates the healthcare entrepreneurship ecosystem and the challenges and considerations associated within. There is a lack of research on how to evaluate and assess the healthcare entrepreneurship ecosystem especially when applying multi-criteria decision-making (MCDM) methods. The Hierarchical Decision Model (HDM) has been utilized to identify several perspectives and factors grouped under them by the expert’s quantification. This research concentrates on underserved communities because that is where the biggest needs and impact can be made to support achieving health equity and universal health coverage. The findings of this research …

Busy Boards, Entrenched Directors And Corporate Innovation, Brian Bolton, Jing Zhao

Business Faculty Publications and Presentations

We provide a comprehensive study of how different corporate governance mechanisms influence corporate innovation. Using panel data regression analysis across a sample of more than 13,600 firm-years for firms based in the United States between 1996–2010, we find that entrenched boards, though commonly associated with lower firm value, actually generate substantial innovation. We find that busy boards hinder innovation unless they also have interlocking relationships. Conversely, interlocked directors enhance innovation, unless they are busy. Directors who are CEOs or Board Chairs at other companies hinder innovation. Interestingly, despite being significant determinants of firm value in other studies, director experience, independence …

Impacts Of City-Level Parking Cash-Out And Commuter Benefits Ordinances, Gabriella Abou-Zeid, Allen Greenberg

PSU Transportation Seminars

For many workers, the decision to drive to work is an economically rational one that minimizes their commute costs. The vast majority of employers offer free workplace parking, with few in comparison offering benefits for transit, walking, biking, or other means of commuting. In effect, employers are incentivizing a behavior that increases roadway congestion, reduces physical activity, and increases emissions. Moreover, since lower-income households are less likely to own and have access to a private vehicle than moderate and higher-income households, free parking is a financial benefit that many lower-income employees cannot access.

Researchers from ICF and the Federal Highway …

Depressive Symptoms In Older Adult Couples: Associations With Dyadic Physical Health, Social Engagement, And Close Friends, Lyndsey M. Miller, Joel Steele, Chao-Yi Wu, Hiroko H. Dodge, Mitzi M. Gonzales, Jeffrey Kaye, Karen Lyons

Psychology Faculty Publications and Presentations

Objective: The objective of this study was to examine associations between level of depressive symptoms in older adult spouse/partner couples and their physical health and social factors (social activity and number of close friends). Methods: Using data from 116 community-dwelling couples (age 76.2 ± 8.5), we simultaneously analyzed associations between depressive symptoms (Geriatric Depression Scale, range 0–11) and dyadic physical health, engagement in social activities, and connectedness with close friends. Results: Greater engagement in social activities was associated with fewer depressive symptoms in men, whereas more close friendships were associated with fewer depressive symptoms in women, controlling for partner e􀀀ects, …

9/11, Culture War, And The Pitfalls Of History, David Horowitz

History Faculty Publications and Presentations

9/11 marks one of the traumatic events of modern U. S. history. Yet its occurrence and aftermath must be placed in the context of social movements and global developments. This presentation focuses on getting past political and social divisiveness. Professor Horowitz has taught at Portland State since 1968, where he won a prize for outstanding achievement in 2007. He is co-author of a U.S. history textbook and has a number of publications to his credit. He is the author of a personal, professional, and political memoir with the title “Getting There: An American Cultural Odyssey.”

Topological Anomaly Detection In Dynamic Multilayer Blockchain Networks, Dorcas Ofori-Boateng, I. Segovia Dominguez, C. Akcora, M. Kantarcioglu, Y. R. Gel

Mathematics and Statistics Faculty Publications and Presentations

Motivated by the recent surge of criminal activities with cross-cryptocurrency trades, we introduce a new topological perspective to structural anomaly detection in dynamic multilayer networks. We postulate that anomalies in the underlying blockchain transaction graph that are composed of multiple layers are likely to also be manifested in anomalous patterns of the network shape properties. As such, we invoke the machinery of clique persistent homology on graphs to systematically and efficiently track evolution of the network shape and, as a result, to detect changes in the underlying network topology and geometry. We develop a new persistence summary for multilayer networks, …

Warming Of The Willamette River, 1850–Present: The Effects Of Climate Change And Direct Human Interventions, Stefan Talke, David Jay, Heida Diefenderfer

Civil and Environmental Engineering Faculty Publications and Presentations

Using archival research methods, we found and combined data from multiple sources to produce a unique, 140 year record of daily water temperature (Tw) in the lower Willamette River, Oregon (1881–1890, 1941–present). Additional daily weather and river flow records from the 1850s onwards are used to develop and validate a statistical regression model of Tw for 1850–2020. The model simulates the time-lagged response of Tw to air temperature and river flow, and is calibrated for three distinct time periods: the late 19th, mid 20th, and early 21st centuries. Results show that Tw has trended upwards at ~1.1 °C …

Technoeconomic Analysis Of Changing Pv Array Convective Cooling Through Changing Array Spacing, Matthew Prilliman, Sarah E. Smith, Brooke Stanislawski, Janine M.F. Keith, Timothy J. Silverman, Marc Calaf, Raul Bayoan Cal

Mechanical and Materials Engineering Faculty Publications and Presentations

Accuracy in photovoltaic (PV) module temperature modeling is crucial to achieving precision in energy performance yield calculations and subsequent economic evaluations of PV projects. While there have been numerous approaches to PV temperature modeling based on both the steady-state and transient thermal assumptions, there have been few attempts to account for changing convective cooling on PV module surfaces resulting from changes in the PV system layout. Changes in system row spacing, in particular, can have a meaningful impact on module electrical efficiency and subsequent economic performance, even when considering additional costs from the changes in row spacing. Using a heat …

How Local Stakeholder Stereotypes Impact Liability Of Foreignness And Asset Of Foreignness, Abiodun Ige, Marvin Washington

Business Faculty Publications and Presentations

While it is well known that there are liabilities of foreignness (LOFs) that impact firms as they enter foreign markets, it is less well known how stereotypes held by local stakeholders impact LOFs of foreign firms. Recent research has demonstrated that foreignness can offer benefits, or assets of foreignness (AOFs), for firms as they enter foreign markets. While research is growing in this area, there remains a gap in our understanding of how local stakeholders evaluate foreign firms. We leverage the stereotype content model, which measures dimensions of warmth and competence, to demonstrate that a foreign firm can enjoy an …