Digital Commons Network^™

Arbuscular Mycorrhizal Fungi Colonization Response To Dike Removal In The Salmon River Estuary, Elinore Webb

Dissertations and Theses

Arbuscular mycorrhizal fungi (AMF) form symbiotic relationships with wetland plants and are important to the restoration of coastal estuaries. The purpose of this study was to assess the presence and colonization of arbuscular mycorrhizal fungi in Distichlis spicata from three formerly diked areas of the Salmon River Estuary to determine an initial understanding of the mycorrhizal community in tidal wetlands post-restoration. AMF were present in all four sample areas and total colonization ranged on average 39-72%. The reference site had the lowest levels of total colonization, which is contrary to the findings of studies of younger wetland restorations. Most importantly, …

Knowledge Overconfidence Is Associated With Anti-Consensus Views On Controversial Scientific Issues, Nicholas Light, Philip M. Fernbach, Nathaniel Rabb, Mugur V. Geana, Steven A. Sloman

Business Faculty Publications and Presentations

Public attitudes that are in opposition to scientific consensus can be disastrous and include rejection of vaccines and opposition to climate change mitigation policies. Five studies examine the interrelationships between opposition to expert consensus on controversial scientific issues, how much people actually know about these issues, and how much they think they know. Across seven critical issues that enjoy substantial scientific consensus, as well as attitudes toward COVID-19 vaccines and mitigation measures like mask wearing and social distancing, results indicate that those with the highest levels of opposition have the lowest levels of objective knowledge but the highest levels of …

The Process Of Establishing A Blooming Chemistry Tool For Use In Undergraduate Chemistry Education And Research, Emryse Geye

Dissertations and Theses

While it is still common in college chemistry to assess student learning and skill with summative assessments, the CER community does not currently have a simple tool to determine and communicate whether an assessment is actually aligned with the outcomes of interest. In particular, as so-called evidence-based teaching practices and active learning strategies gain a foothold in college chemistry classrooms, the ability to communicate whether those (often labor-, cost-, and time-intensive) interventions are not only aligned with course outcomes, but also provide measurable benefit to students becomes more imperative. While college chemistry has made some strides in the area of …

A Pilot Study Considering Ecoroofs As Therapeutic Landscapes, Olyssa Starry, Arjun Viray, Brenna Park-Egan, Amber Terway, Timothy Oxendahl, Tina Dawn Lillian Burdsall

Sociology Faculty Publications and Presentations

The potential for urban open spaces to convey therapeutic benefits is increasingly substantiated. More work is needed to specifically consider how low impact designs to manage stormwater such as ecoroofs perform in this context. Here, we report on a pilot study addressing: (1) factors determining whether a hospital has an ecoroof, and (2) how ecoroofs might convey therapeutic benefits. We utilized a mixed methods approach which encompassed phone interviews of hospital ecoroof managers as well as analysis of national hospital databases. We also conducted a local case study which compared cortisol samples and stress indicators from patients, staff, and caregivers …

Modeling And Analysing The Impact Of Heat Pump Water Heaters On Distribution Systems Using Gridlab-D, Midrar Adham

Dissertations and Theses

With the constant increase in energy demand, finding ways to reduce peak load and the energy-costs factors has become more imperative. Domestic water heating showcases a significant opportunity for such applications. Water heating is the second-highest energy consumer in the residential sector across the United States. Electric Water Heaters (EWHs), in particular, constitute nearly 43% of American household water heating energy consumption. Heat Pump Water Heater (HPWH), on the other hand, is an advanced water heating technology that has recently emerged in the United States residential market.

The objectives of this work are to develop a HPWH model and build …

Involving More People In Election Observation With Stephanie Frank Singer, Stephanie Singer

PDXPLORES Podcast

In this episode of PDXPLORES, Senior Fellow of PSU's Center for Public Service, Stephanie Frank Singer, discusses a community-based civics education program that addresses the need for citizens from diverse identity groups to participate in election monitoring, an activity that holds the electoral process accountable, ensures the integrity of the electoral system and builds public trust in democratic institutions. PSU's Community Engaged Research Academy supports the project co-led by PSU professor and political scientist Lindsay J. Benstead. Project partners include the League of Women Voters of Oregon and the Oregon Secretary of State Elections Division.

Click on the "Download" button …

A Privacy-Preserving Strategy For The Trust Layer Of The Energy Grid Of Things Distributed Energy Resource Management System, Mohammed Abdullah Alsaid

Dissertations and Theses

Emergent from the shadows of the traditional grid flaws, the Smart Grid (SG) idea was born and led by government mandates toward cleaner energy production. The SG represents the next generation of electricity distribution systems that subsume recent technological innovations. It uses digital communication between its components and entities to attain more automation, self-sufficiency, and reliability. Unfortunately, this relatively new concept is not flawless; the intrinsic reliance on increased digital communication spreads open attack paths for adversaries. Therefore, finding solutions that address information exchange vulnerabilities has become imperative.

The Energy Grid of Things (EGoT) is Portland State University's implementation of …

Drivers Of Spatiotemporal Eukaryote Plankton Distribution In A Trans-Basin Water Transfer Canal In China, Yuying Li, Faisal Hayat Khan, Jiamin Wu, Yun Zhang, Yeqing Jiang, Xiaonuo Chen, Yinlei Yao, Yangdong Pan, Xuemei Han

Environmental Science and Management Faculty Publications and Presentations

Planktonic eukaryotes are important components of aquatic ecosystems, and analyses of the whole eukaryotic planktonic community composition and function have far-reaching significance for water resource management. We aimed to understand the spatiotemporal variation and drivers of eukaryotic plankton distribution in the Middle Route Project of the South-to-North Water Diversion in Henan Province, China. Specifically, we examined planktonic assemblages and water quality at five stations along the canal and another one located before the dam in March, June, September, and December 2019. High-throughput sequencing revealed that the eukaryotic plankton community was primarily composed of 53 phyla, 200 genera, and 277 species, …

Nmr Analyses Of Flavored E-Cigarette Liquids Before And After Aerosolization, Paul Joseph Kerber

Dissertations and Theses

Electronic cigarettes (e-cigarettes) are the most commonly used tobacco products among adolescents with ~11 and ~3% of high school and middle school students reporting past 30 day use in 2021 according to the Centers for Disease Control and Prevention (CDC), respectively. Furthermore, greater than ~80% of high school and middle school e-cigarette consumers use flavored e-liquids. Consumers can be exposed to variable toxicant levels upon e-liquid aerosolization, depending on the composition of the e-liquid, type of e-cigarette, e-cigarette settings, and other customizations.

E-liquids are typically composed of a carrier solvent (propylene glycol (PG) and glycerol (GL)), flavorants, and nicotine. PG …

Writing New Lives, Writing New Worlds, A. Zed

Amplify: A Journal of Writing-as-Activism

Creative nonfiction. Children are learning to write their letters. Adults are learning to write their feelings. All of us are learning to write our stories, and thereby release some of the trauma circling through our world.

3 Selections From "Upon The Body: Poems Of/To A Black Social Epi, Pt.Ii--Love//Resistance In The Time Of Covid", R. J. Petteway

Amplify: A Journal of Writing-as-Activism

The 3 poems included here are from a collection written between January and August 2020. The full collection—27 poems total—examines intersections of structural racism, racialized police violence, and COVID-19, drawing from generations of creative resistance produced and embodied by Black artists, activists, and scholars like Nina Simone, Langston Hughes, Paul Laurence Dunbar, Audre Lorde, Ida B. Wells, James Baldwin, and W.E.B. DuBois. The collection as a whole is crafted as counternarrative to public health’s ahistoric, apolitical, racist, and homophobic proclivities in times of crisis. The 3 poems here are from Part II, "LOVE//Resistance in the Time of COVID.” These selections …

Public History Is Now, Sarah E. Dougher

Amplify: A Journal of Writing-as-Activism

A walking tour of downtown Portland in August 2021 raises questions for the writer about the purpose of “memory activism,” its relation to writing-as-activism. Drawing on critiques of urbanist Jane Jacobs and interrogating the concept of “reckoning,” the essay explores ways in which the streetscape and people there can deliver meaning and pose questions about systemic racism and unsheltered existence.

Gentle Action Theory As A Method Of Deliberative Democracy In Addressing The Lack Of Voice For Indigenous Students In Institutions Of Higher Education, Carma J. Corcoran

Amplify: A Journal of Writing-as-Activism

This paper examines how Indigenous college students attending non-tribal colleges and universities in the United States experience feelings of alienation and marginalization. The concept of democracy and deliberation from the model of the larger oppressive society is not a cultural norm. Civic engagement is experienced differently in Indigenous communities. This paper articulates the outcomes of a deliberative forum which examined the concept of democracy employing Gentle Action Theory as the method to provide the students an opportunity to share their thoughts and experiences and to express their frustrations and needs regarding their academic endeavors. The comparison of Traditional Ways and …

A Message From The Editors, Vicki L. Reitenauer, Rhiannon M. Cates

Amplify: A Journal of Writing-as-Activism

An introduction from the founding co-editors to the inaugural issue of Amplify: A Journal of Writing-as-Activism.

A Distributed Trust Model Simulator For Energy Grid Of Things Distributed Energy Resource Management System, Abdullah Barghouti

Dissertations and Theses

The evolution of networks into more distributed, self-reliant nodes has mitigated single-point failures that plagued traditional centralized networks. Applied to power grids, distributed systems can increase the integrity and availability of grid services while also offering a power management solution. However, while distributed networks provide scalability, security, and sustainability compared to centralized networks, their distributed nature makes them harder for anomaly detection and prevention. Incorporating a Distributed Trust Model (DTM) System into an Energy Grid of Things Distributed Energy Resource Management System (EGOT DERMS) allows grid participants to be characterized and their communication to be analyzed for possible attacks. A …

Modeling Postfire Effects On Snow Albedo And Forest Recovery Over A Chronosequence Of Burned Forests In The Triple Divide Region Of The Rocky Mountains, Anton J. Surunis

Dissertations and Theses

Wildfires impact snow albedo, forest cover, and forest structure and thus snow melt rate and snowpack supply for as long as 15 years following burn. These effects have not been quantified at fine spatial resolutions and long time periods at a watershed scale. I modeled the effects of postfire effects on snow albedo, snow-mass energy balance, and resulting snow-water equivalent (SWE) depth over a long-time scale and at a fine spatial resolution. Using a spatially and temporally distributed snow evolution model called SnowModel, I modeled postfire effects on snow albedo and forest structure over postfire recovery within 8 forest fires …

Summing Hecke Eigenvalues Over Polynomials, Liubomir Chiriac, Liyang Yang

Mathematics and Statistics Faculty Publications and Presentations

In this paper we estimate sums of the form ∑n≤X|aSymmπ(|f(n)|)|, for symmetric power lifts of automorphic representations π attached to holomorphic forms and polynomials f(x)∈Z[x] of arbitrary degree. We give new upper bounds for these sums under certain natural assumptions on f. Our results are unconditional when deg(f)≤4. Moreover, we study the analogous sum over polynomials in several variables. We obtain an estimate for all cubic polynomials in two variables that define elliptic curves.

A Day Late And A Dollar Short: Examining Perceptions Of Which Exonerees Deserve Compensation, Alexandra Pauline Olson

Dissertations and Theses

Many exonerees do not receive compensation from the state after they are found innocent and released because most states have exclusionary laws that bar exonerees from receiving compensation. This thesis examined public perceptions of exclusionary laws and addressed the broader question of who deserves compensation (according to community members). Online participants (n = 225) read an article about a fictional exoneree who either pleaded guilty or was convicted by a jury trial and who received a subsequent conviction or did not receive a subsequent conviction. An exoneree with a subsequent conviction was perceived as less deserving of financial compensation, …

Learning From Machines: Insights In Forest Transpiration Using Machine Learning Methods, Morgan Thornwell

Dissertations and Theses

Machine learning has been used as a tool to model transpiration for individual sites, but few models are capable of generalizing to new locations without calibration to site data. Using the global SAPFLUXNET database, 95 tree sap flow data sites were grouped using three clustering strategies: by biome, by tree functional type, and through use of a k-means unsupervised clustering algorithm. Two supervised machine learning algorithms, a random forest algorithm and a neural network algorithm, were used to build machine learning models that predicted transpiration for each cluster. The performance and feature importance in each model were analyzed and compared …

Analyzing Classroom Discourse To Investigate Structuring Equitable Mathematical Talk In Small Groups And Whole-Class Discussions, Brittney Marie Ellis

Dissertations and Theses

Shifting classroom discourse to be more student-centered has become an integral part of reform-oriented instructional practices. At the same time, shifting discourse can open up opportunities for inequity to occur in the immediate learning environment as both the quantity and quality of mathematical talk changes. In this project, I examined complexities involved in such settings by using discourse analysis methods to explore the positioning of students relative to mathematics content and each other's mathematical ideas. First, I analyzed the ways teachers' discourse during group work enactments related to established equitable teaching practices. Findings from this study suggest communicating group tasks …

Framing The Green New Deal And Climate Change: A Content Analysis Of The New York Times And The Wall Street Journal, Danielle Elizabeth Duffy

Dissertations and Theses

The importance of climate change recognition and need for action cannot be overstated. Climate change has historically been a partisan issue with an almost hyper focus on the (un)certainty of science, the need for action within a particular timeframe, and the cost of tackling the issue. With the contemporary relevance and salience of climate change, this content analysis explores emerging framing patterns in coverage of the Green New Deal and subsequent climate change references within news articles from the New York Times and Wall Street Journal in 2019. Frame typology from O'Neill et al. (2015) is used to explore the …

High School Persisters And Alternative Schools, Hyuny Clark-Shim

Dissertations and Theses

In response to a "dropout crisis," over the past decade much effort was made to retain high school students. Recent years' trends indicated an overall increased level of graduation rates; however, there has been a largely overlooked student population, persisters, who did not earn a high school diploma by the expected graduation date but remain engaged and continue to work towards graduation into their fifth or even sixth year of high school.

Using exploratory CART analysis, this study examined what individual-level and school-level factors were most effective in distinguishing students who were persisters versus on-time graduates. Given that persisters …

Toward Analyzing The Diversity Of Extractive Summaries, Aaron David Hudson

Dissertations and Theses

As the amount of text generated across the internet continues to increase, developing methods for processing that text to glean valuable insights is paramount. Automatic text summarization is one such method that aims to provide a concise and representative summary of input text, allowing users access to the most salient points from a large amount of textual data. However, in working with these summaries, especially those generated from social media data, questions arise about not only the quality of a summary, but also its ability to reflect the diversity of user perspectives. This work examines the quality of summaries with …

Stoneware And Earthenware From The Beeswax Wreck: Classification Of The Dubé Collection And Discussion Of The Interpretation Of The Materials In Protohistoric Sites, Vanessa Renee Litzenberg

Dissertations and Theses

Over the past three centuries, items from the Beeswax Wreck have been discovered on Oregon's northern coastline near Manzanita, including stoneware and earthenware fragments. While the stoneware and earthenware were not noticed by beachcombers washing ashore until more recently, similar artifacts have been noted within Indigenous sites for decades. While most of the analysis of the artifacts found in protohistoric settings are used to provide proof of a wreck or potentially a marker of the start of the contact period, this study aims to provide some context to the stoneware and earthenware sherds related to the wreck. The goal was …

Treatment Disparities In Emergency Medical Services: The Influence Of Race/Ethnicity, Obesity, And English Proficiency, Jamie Kennel

Dissertations and Theses

Different treatment in healthcare settings provided to different social groups of people may lead to disparities in health, quality of life, and life span. Despite the critical role among healthcare services that Emergency Medical Services (EMS) provides disproportionately for marginalized communities, it remains unclear if and to what extent treatment disparities take place in the pre-hospital setting. Guided by the theoretical frameworks of social worth, aversive racism, and stigma, this study utilizes medical chart data from three different public and private datasets to investigate treatment disparities by Emergency Medical Service providers for racial minority, obese, and limited English proficiency patients. …

Gender Equity And State-Mosque Relations In Middle East North Africa: A Case Study Of Tunisia, Joy Amarachi Agbugba

Dissertations and Theses

Why is the Middle East North Africa region consistently ranked the lowest on the gender equity scale? This question is quite perplexing and that has driven several scholarly researchers to investigate the situation of gender and women's rights within the states in the region. In this research, I explore the various theories explaining the cause of gender inequity in this region including the Islam thesis/social modernization theory, political-economic theory, and psychological/social structural theories, with an emphasis on the Islamic thesis theory. I argue that the state's support and prioritization of Muslim/sharia law over federal law is a major contributor to …

Unpaired Style Transfer Conditional Generative Adversarial Network For Scanned Document Generation, David Jonathan Hawbaker

Dissertations and Theses

Neural networks are a powerful machine learning tool, especially when trained on a large dataset of relevant high-quality data. Generative adversarial networks, image super resolution and most other image manipulation neural networks require a dataset of images and matching target images for training. Collecting and compiling that data can be time consuming and expensive. This work explores an approach for building a dataset of paired document images with a matching scanned version of each document without physical printers or scanners. A dataset of these document image pairs could be used to train a generative adversarial network or image super resolution …

"Damn, Man. The Time That I Lost": Power And The Process Of Diagnosis For Women With Chronic Illnesses, Kaitlin Roquel Yeomans

Dissertations and Theses

Historical sociological research on people with chronic illness has examined their navigation of their lives post-diagnosis. Diagnosis has been considered with regard, not to its process, but rather to its definitions. While a rich literature has been produced by such approaches, how people experience the process of diagnosis has largely been ignored. This research looks at the process of diagnosis as a series of moments, all of which hold specific meaning in the interactional context of the patient-provider relationship. Looking at diagnosis from the patient’s perspective demonstrates how information about health and illness is exchanged, navigated, and negotiated. Importantly, this …

Engaging Public Health Critical Race Praxis In Local Social Determinants Of Health Research: The Youth Health Equity And Action Research Training Program In Portland, Or—Yheartpdx, Ryan J. Petteway, Lourdes Gonzalez

OHSU-PSU School of Public Health Faculty Publications and Presentations

The social determinants of health (SDH) have long been considered a core mechanism through which racial health inequities are (re)produced and incubated in the U.S. Moreover, scholars have expressly—and appropriately—named structural racism as a precursor to inequities associated with SDH. However, while research on racial health inequities—SDH-related or otherwise—continues to grow, communities of color remain grossly underrepresented as public health researchers and practitioners. Additionally, although SDH are experienced in a very local sense, much research and practice fails to more deeply and thoroughly engage and center local community knowledges. Thus, much work around SDH and racial health inequities presents, ironically, …

Efficiency In The Upper Deschutes Basin: Understanding The Hydrosocial Implications Of Irrigation Canal Piping, Rebecca Anderson

Dissertations and Theses

In response to water scarcity, irrigation efficiency projects aim to conserve water for in-stream flow and agricultural use. Piping irrigation canals is a common irrigation efficiency method which reduces the loss of incidental recharge, resulting in trade-offs within a hydrosocial system. Few studies have focused on the consequences of canal piping and none have integrated a critical analysis of the social factors involved in deciding what constitutes 'efficient' water use. This study seeks to fill this gap by combining natural and social science to give attention to the scales and perspectives involved in irrigation efficiency canal piping and the material …