Digital Commons Network^™

Removal Efficiencies, Uptake Mechanisms And Competitive Effects Of Copper And Zinc In Various Stormwater Filter Media, Emily Heleva-Ponaski

Dissertations and Theses

Polluted stormwater, if not treated, can compromise water quality throughout our hydrologic cycle, adversely affecting aquatic ecosystems. Common stormwater pollutants, copper and zinc, have been identified as primary toxicants in multiple freshwater and marine environments. For small-scale generators, stormwater management can be cumbersome and implementation of common BMPs impractical thus catch basins are popular though not the most environmentally conscious and sustainable option. This study aims to characterize the potential of a mobile media filter operation for the treatment and on-site recycling of catch basin stormwater. The removal capacities of various commercially available filter media (e.g. a common perlite; Earthlite™, …

"The Battling Ground": Memory, Violence, And Resistance In Greenwood, North Tulsa, Oklahoma, 1907-1980, Greta Katherine Smith

Dissertations and Theses

Tulsa, Oklahoma's historically African American neighborhood of Greenwood in North Tulsa has long been contested terrain. Built by black settlers beginning in the late nineteenth-century, the neighborhood evolved into a vibrant community challenged by waves of violence--segregation at statehood in 1907, the Tulsa Race Riot of 1921, ongoing disinvestment, and processes of urban renewal beginning in the late 1950s--that contributed to the erosion of the neighborhood and the eventual displacement of many area residents into remote housing projects further into North Tulsa. These waves of violence were propelled by Oklahoma lawmakers, local Tulsa government officials, members of the Ku Klux …

Driver Distraction In Microsimulation Of A Mid-Block Pedestrian Crossing, Darryl Joseph Michaud

Dissertations and Theses

Traffic simulation has become an invaluable part of the traffic engineering toolbox. However, the majority of driver models are designed to recreate traffic performance based on interactions among vehicles. In keeping with this pursuit, most are fundamentally built to avoid collisions. This limits the applicability of using these models for addressing safety concerns, especially those regarding pedestrian safety performance. However, by explicitly including some of the sources of human error, these limitations can, in theory, be overcome. While much work has been done toward including these human factors in simulation platforms, one key aspect of human behavior has been largely …

Assessing Ppgis Usability And Its Relationship To Spatial Data Production: A Case Study, Timothy Michael Hitchins

Dissertations and Theses

Modern Geoweb-enabled PPGIS methodologies incorporate interactive map applications as the main driver for public engagement and data collection. However, little research explores exactly how the public interact with these applications to produce spatial data, a fact that contributes to criticisms of final data quality. Usability evaluation offers a solution for developing better PPGIS data production systems by identifying problems in the application interface for which the public engage. Drawing on a case study example of a PPGIS application developed to collect socio-spatial data from members of a random public, this paper addresses usability in a three-stage approach. First, controlled experimentation …

Ecology And Population Dynamics Of Salmonids In The Columbia River: Response Of Fishes To Anthropogenic Change In A Large Riverscape, Timothy Sean Elder

Dissertations and Theses

Freshwater ecosystems and the species that reside therein are disproportionately imperiled compared to terrestrial systems. Over the past 150 years, the Columbia River basin in the western United States has gone from one of the most productive and abundant salmon watersheds in the world, to having just a small fraction of its former salmon abundance. The cause of declines in salmon productivity and abundance are related to overlapping and confounding stressors including changes in large-scale climatic patterns and anthropogenic alterations within and adjacent to the Columbia River. Four main anthropogenic stressors have been identified as the leading causes of salmonid …

Online Learners: A Study Of Their Advising Attitudes, Experiences, And Learning, Stephen Philip Jenkins

Dissertations and Theses

Academic advising for online learners has been identified in prior research as an important student service. However, little research exists to assist advisers in knowing how best to serve this growing group. The purpose of this study is to close that research gap by determining if and how online and on-campus learners differ in how they rate the importance of various functions of academic advising as well as determining if their frequency of access to academic advising and source of advising information differed. Additionally, the research examines if the types and levels of learning for online learners varied by frequency …

The Urban Food Desert As A Model For The Urban Health Care Desert: Fundamental Causes And Economic Considerations, Estevan A. Garcia

Dissertations and Theses

Introduction: A “health care desert” is a part of the country where needed medical, behavioral, mental, dental, and/or pharmaceutical health care services are extremely limited or altogether unavailable. This terminology is based on the concept of a “food desert,” which describes an area where people have limited access to affordable and healthy foods, and which, together with the negative health consequences of eating lower-quality foods, is well described in public health literature. The application of this terminology to an urban environment with ready access to transportation has been limited and is controversial. However, the recent increase in urban hospital closures …

Burden Of Lipohypertrophy Among Insulin Dependent Diabetes Mellitus Patients In China: An Analysis Of Outcomes And Impact Of Pen Needle Reimbursement Policy, Arthi Chandran

Dissertations and Theses

Background

Diabetes is a global epidemic and with an aging population accompanied by rapid urbanization China ranks highest in disease prevalence and associated burden. Independent of diabetes type, insulin is an eventual and costly requirement for disease management. The consequences of insulin administration however are poorly understood. Lipohypertrophy (LH) is one such consequence. It is hypothesized that method of insulin delivery and poor delivery technique are significant risk factors for this condition which is believed to alter insulin pharmacodynamics. Subsequently, insulin pen needles are a critical component of care however access to pen needles varies across China.

Objective

The objective …

Giving The Noose The Slip: An Analysis Of Female Murderers In Oregon, 1854-1950, Jenna Leigh Barganski

Dissertations and Theses

Analyzing the crimes of women murderers and how they fared in the criminal justice system demonstrates that though perceptions of gender evolved, resistance to sentencing women to death often persisted. The nature of homicides committed by women in Oregon set them apart from their male counterparts. Women were, and are, more likely to commit domestic homicides -- murders that involve a family member or partner. These crimes are typically not equated with crimes that warrant capital punishment. As a result, no woman has been subjected to the death penalty in the state.

This thesis analyzes the twenty-five women who were …

How Can Community Engagement In The Local Past And Archaeological Research Be Mutually Beneficial? A Case Study In Community Archaeology From Sauvie Island, Oregon, Martin John Plumer

Dissertations and Theses

Community archaeology's broader objectives include increasing public understanding of archaeology and making archaeology more relevant to people's day to day lives. Fulfilling these goals could be beneficial to the public in terms of their gaining more agency in, and more access to, archaeology; and it could be beneficial to archaeologists in terms of increasing public support for archaeological work. While many community archaeologists report success, few authors critically evaluate the experience and outcomes of community archaeology. As a result, little data-based understanding exists about what is gained through community archaeology. This project explores that question through three primary means: 1) …

"My Teacher Says I'M An Overachiever, But I Think He's An Overexpecter" : Teacher Expectations, Self-Concept, And Academic Success, Jennifer Lea Campbell

Dissertations and Theses

This study explores the relationship between student judgments of teacher expectations and academic success, student self-concept and academic success, and student judgments of discrimination experiences and academic success. In the winter of 2018, a sample of 176 communication students at a northwestern university completed revised versions of the Teacher Treatment Inventory (TTI) and the Self-Description Questionnaire III (SDQ III), as well as the original Everyday Discrimination Scale (EDS). College-age students found the TTI confusing, and many participants said they did not have a relationship with their college professors. The hypothesis that suggested student judgments of teacher expectations would positively correlate …

Using Strong Laser Fields To Produce Antihydrogen Ions, Christopher Michael Keating

Dissertations and Theses

We provide estimates of both cross section and rate for the stimulated attachment of a second positron into the (1s^{2 1}S^e) state of the H+ ion using Ohmura and Ohmura's (1960 Phys. Rev. 118 154) effective range theory, Reiss's strong field approximation (1980 Phys. Rev. A 22, 1786), and the principle of detailed balancing. Our motivation for producing H+ ion include its potential to be used as an intermediate state in bringing antihydrogen to ultra-cold (sub-mK) temperatures required for a variety of studies, which include both spectroscopy and the probing of the gravitational interaction of …

Examining The Spatial Characteristics Of Pluvial Flooding Through Citizen Science In Portland, Oregon, Katelyn Rachel Michelson

Dissertations and Theses

Pluvial flooding is caused by rainfall events that overwhelm drainage systems and do not allow excess water to be absorbed by soils or water infrastructure. This type of flooding occurs frequently in urban systems and leads to public inconveniences and infrastructure deterioration, which could cost more than fluvial flooding over time. Increased rainfall intensity, which is projected to increase with climate change, could result in increased pluvial flooding. This study aims to examine the vulnerability of pluvial flooding in Portland, OR (2010-2017) by incorporating an interdisciplinary framework that examines the physical and socioeconomic vulnerability of flooding through citizen-reported flooding data. …

Delphinids On Display: The Capture, Care, And Exhibition Of Cetaceans At Marineland Of The Pacific, 1954-1967, Taylor Michael Bailey

Dissertations and Theses

When Marineland of the Pacific opened in 1954 on the Palos Verdes Peninsula in greater Los Angeles, it was the second oceanarium in the world and the first on the West Coast. An initial investment of $3 million by Oceanarium Inc., owners of the popular Marine Studios park located near St. Augustine, Florida, ensured that Marineland was built with the same state of the art facilities needed to produce an authentic representation of the ocean floor on land. Building on Marine Studios' success exhibiting bottlenose dolphins (Tursiops truncatus), Marineland's central draw was its performing cetaceans. During the park's …

The Impact Of Leader Race And Gender On Perceptions Of Organizations In Response To Corporate Error, Nicolas Derek Brown

Dissertations and Theses

Prior research has demonstrated that CEO behavior influences how people perceive corporations and that CEOs associated with controversy can damage corporate reputations. Research also illustrates that attitudes based on prescribed racial and gender characteristics render Black and female CEOs as incongruent with leadership positions. The purpose of this study is to examine the impact of two different corporate errors as justification factors leading to prejudicial evaluations of leaders with stigmatized identities (e.g., race and gender), with a particular emphasis on the intersection of race and gender on leader- and organization-based evaluations. Participants were randomly assigned to one of 12 corporate …

Our Town: Articulating Place Meanings And Attachments In St. Johns Using Resident-Employed Photography, Lauren Elizabeth Morrow Everett

Dissertations and Theses

The St. Johns neighborhood of North Portland is known for its strong regional identity, working class character, and diversity. Portland as a whole has experienced a major socioeconomic shift in the last ten years, and these changes are hitting St. Johns particularly hard. My research seeks to identify the place meanings that underpin sense of place, place attachment, and processes of attachment formation, among residents of the neighborhood. My research questions are: What are the objects of attachment? Why (the place meanings that underpin attachment)? And how (through what processes are attachments formed)? In what ways are the "why" and …

Automating Variation And Repeater Analysis In Physical Design Of Integrated Circuits, Subrat Mahalik

Dissertations and Theses

Rapid advancement and innovation in semiconductor research have continuously helped in designing efficient and complex integrated circuits in miniature size. As the device technology, is aggressively scaling to improve the device performance, the issues related to device interconnects, power, and reliability have become a major concern for the designers. These challenges make the design and validation of ASIC extremely complicated.

The primary idea of this work is to develop automation tools, to be used in the physical design flows to improve the efficiency of the design flow. The first tool named as variation analysis tool automates the on-chip variation modeling …

Chemo-Thermo Cure Of Viscoelastic Materials For Semiconductor Packaging Applications, Anjali Pradeep Kumar

Dissertations and Theses

Viscoelastic polymer materials are being actively considered as a novel material for semiconductor packaging applications as a result of their ability to develop strong adhesive bonds at lower temperatures. Viscoelastic thermoset materials are impacted by the stresses generated during the curing process, which is also accompanied by a dissipation of thermal energy. There is a need to develop a generic modeling formulation that is applicable to any material of interest in order to enable the study of different bonding materials and develop optimized curing cycles. This study reports a numerical formulation to evaluate the stress generated and energy dissipated during …

Novel 2d Structure Nanomaterials Synthesis And Ir Absorption, Suming Wang

Dissertations and Theses

Nanomaterials have gained much attention as in energy storage application for its unique electrical properties. Many research groups have developed various methods to fabricate nanomaterials for various applications. However, there exists much possibilities of developing cost-effective methods for nanomaterial fabrication. No one has studied using natural organic compound A as solution base for wet process nanomaterial synthesis.

In this study, a new method of fabricating two-dimensional structure nanomaterials is proposed. This method is applicable for multiple metal elements such as copper oxide, copper hydroxide, and iron oxide. The two dimensional structure nanomaterials have prestige properties because of their large surface …

Assessing Spatiotemporal Stream Temperature Trends And Drivers Through Integrated Longitudinal Thermal Profiling And Stationary Data Logger Methodology On The Upper Chehalis River, Wa, Whitney Vonada

Dissertations and Theses

This study encompasses 25 kilometers of the Chehalis River in Washington, USA that currently has sections under a Total Maximum Daily Load (TMDL) plan for stream temperature impairments that exceed 18°C, a regulatory standard set at the time of the listing to protect salmonid spawning, rearing, and migration. Using information integrated from stationary data loggers (n=22) that collected stream temperature information from August 4-September 10, 2017, and longitudinal thermal profiling performed on July 29-30, August 4-5, and September 9-10, 2017, this study aimed to quantify the spatial distribution of stream temperature, evaluate relative consistencies of the riverine thermal regime over …

Removing Dams, Constructing Science: Watershed Restoration Through A Socio-Eco-Technical Systems Lens, Zbigniew Jakub Grabowski

Dissertations and Theses

Ecological conservation and restoration in the anthropocene must struggle with overlapping drivers of biodiversity and cultural loss; ruptures of the ecological environment mirror ruptures of human relationships with nature. And yet technology cannot remove humans from nature; technological and infrastructural reconfigurations of nature create new vulnerabilities and risks for humans and ecosystems alike. How can conservation and restoration science productively grapple with complex infrastructure systems and decision-making processes as biophysical and social drivers of ecosystem change?

Using dam removals in the USA and in the Mid Columbia River region of the Pacific Northwest, this dissertation develops a conceptual framework for …

Quantifying Spatial Potential Access Equity In An Agent Based Simulation Model Of Buprenorphine Treatment Policy In The United States, Alexandra Elizabeth Nielsen

Dissertations and Theses

Opioid dependence and opioid related deaths are a public health problem which the United States Centers of Disease Control have declared an epidemic. While opioid agonist therapy for opioid addiction has been accepted as the most effective treatment for opioid dependence among academics, and office based buprenorphine treatment has been available in the Unites States for over 10 years, OB buprenorphine faces many barriers to widespread adoption. Empirical data on the geographic distribution of physicians able to prescribe buprenorphine and the prescribing patterns of those physicians show considerable unevenness in access and utilization of treatment services.

Federal-level policies have recently …

Thiophene-Based Molecular Sensors Towards The Selective Detection Of Mercury(Ii) And Other Metals, Austin Kazuo Shigemoto

Dissertations and Theses

This work describes several thiophene-based molecular sensors and various modifications aimed to improve and understand the photophysical and supramolecular properties, such as the association constant (K_a) and selectivity, towards the development of a selective mercury(II) sensor. From the first generation of sensors containing pyridine and thiophene groups, it was determined that thiophene can offer good selectivity for mercury(II) against other transition metal ions, and provide a ratiometric absorption and fluorescent response. The projects following this focused on improving the K_a of the first generation of sensors through several different strategies. Substitution of thiophene for dibenzothiophene was …

Thietmar Of Merseburg's Views On Clerical Warfare, Benjamin Joseph Wand

Dissertations and Theses

The tenth-century German bishop was more than just a spiritual leader, he was also a territorial lord with secular power. These bishops also lived in an environment where violence was sometimes a way of life. His culture contained a social dynamic that saw violence as a tool for defending and maintaining honor and as a mechanism for dispute resolution. Therefore, some bishops behaved violently, either to defend their diocese from threats or to serve their own political intrigues. In some instances bishops were said to be more skilled in warfare than secular lords. However, while some clergy participated in warfare …

Developing A Mixed-Methods Method To Model Elderly Health Technology Adoption With Fuzzy Cognitive Map, And Its Application In Adoption Of Remote Health Monitoring Technologies By Elderly Women, Noshad Rahimi

Dissertations and Theses

Providing healthcare to the ever-rising elderly population has become a severe challenge and a top priority. Emerging innovations in healthcare, such as remote health monitoring technologies, promise to provide a better quality of care and reduce the cost of healthcare. However, many elderly people reject healthcare innovations. This lack of adoption constitutes a big practical problem because it keeps the elderly from benefiting from technology advances. The phenomenon is even more pronounced among elderly women, who represent the majority of the elderly population.

A plethora of studies in the field of technology adoption resulted in sound, but highly generalized theories …

Inclusion And Assimilation: Including Change In The Workplace, Marisa Jean Miller

Dissertations and Theses

Organizational assimilation is an ongoing and dynamic relationship between organization and individual member, where employees learn the expected norms of the organization and feel that they are able to attempt to make a change to the organization. Organizational members rely on social interactions within the organization to acquire the necessary knowledge they need to perform their roles, as well as support to attempt changes within the organization. This study proposes that feelings of inclusion, or the perception that an employee both belongs to and is unique within an organization, may be an influential construct associated with organizational assimilation and beneficial …

3d Hydrodynamic, Temperature, And Water Quality Numerical Model For Surface Waterbodies: Development, Verification, And Field Case Studies, Hussein Ali Mahdi Al-Zubaidi

Dissertations and Theses

Numerical modeling has become a major tool for managing water quality in surface waterbodies such as rivers, lakes, reservoirs, and estuaries. Since the two-dimensional longitudinal/vertical model CE-QUAL-W2 is a well-known model and it has been applied to thousands of waterbodies around the world successfully, its numerical scheme was adapted to develop a new three-dimensional numerical model for simulating hydrodynamics, temperature, and water quality in surface waterbodies. Finite difference approximations were used to solve the fluid dynamic governing equations of continuity, free water surface, momentums, and mass transport. No coordinate transformations were performed and the z-coordinate system has been used. Higher-order …

Rock Glaciers Of The Contiguous United States: Spatial Distribution, Cryospheric Context, And Riparian Vegetation, Gunnar Forrest Johnson

Dissertations and Theses

Continental-scale inventories of glaciers are available, but no analogous rock glacier inventories exist. We present the Portland State University Rock Glacier Inventory (n = 10,343) for the contiguous United States, then compare it to an existing inventory of contiguous United States glaciers (n = 853), identifying geographic and climatic factors affecting the spatial distributions observed. At least one rock glacier is identified in each of the 11 westernmost states, but nearly 90% are found in just five; Colorado (n = 3889), Idaho (n = 1723), Montana (n = 1780), Utah (n = 834), and Wyoming (n = 849). Glaciers are …

Using Wetlands To Prevent The Surface Accumulation Of Aphanizomenon Flos-Aquae From Upper Klamath Lake, Arick Christopher Rouhe

Dissertations and Theses

The ability to regulate buoyancy (sinking and floating) using cellular gas vesicles is a unique characteristic that allows many common bloom-forming cyanobacteria to accumulate at water surfaces and dominate systems. Typical control and management strategies include nutrient manipulation and phosphorus reduction, which are effective but do not reduce the advantage of buoyancy control. Since buoyancy control is based upon a mechanism that is driven by photosynthesis along with environmental conditions that trigger vesicle formation and ion exchange, buoyancy regulation can be influenced by manipulating extracellular conditions. In this study I manipulated extracellular conditions using wetland water and additions of potassium, …

Selling Protest In The News? Movement-Media Framing Of Occupations: An Exploratory Study, Andrew David Butz

Dissertations and Theses

Using quantitative content analysis, this study explores social movement (SM) framing in commercial news media -- by comparing how leading newspapers covered prominent protest occupations in 2011 and 2016. More than other SMs, anti-systemic protests like the 2011 Occupy Wall Street (OWS) and the 2016 Malheur Refuge Occupation (MRO) only have partial frame-setting agency, raising a broad theory question (to inform the research questions below): If SMs and media relate as interacting systems, are protest news frames more movement- or more media- driven; and do media not just enable but also constrain SMs?

With the movement-media theory question above, the …