Digital Commons Network^™

Using Repeat Terrestrial Laser Scanning And Photogrammetry To Monitor Reactivation Of The Silt Creek Landslide In The Western Cascade Mountains, Linn County, Oregon, Justin Craig Mccarley

Dissertations and Theses

Landslides represent a serious hazard to people and property in the Pacific Northwest. Currently, the factors leading to sudden catastrophic failure vs. gradual slow creeping are not well understood. Utilizing high-resolution monitoring techniques at a sub-annual temporal scale can help researchers better understand the mechanics of mass wasting processes and possibly lead to better mitigation of their danger. This research used historical imagery analysis, precipitation data, aerial lidar analysis, Structure from Motion (SfM) photogrammetry, terrestrial laser scanning (TLS), and hydrologic measurements to monitor displacement of the Silt Creek Landslide in the western Cascade Mountain Range in Linn County, Oregon. This …

Areal Extent And Volumes Of The Dinner Creek Tuff Units, Eastern Oregon Based On Lithology, Bulk Rock Composition And Feldspar Mineralogy, Teresa Rae Hanna

Dissertations and Theses

The Dinner Creek Tuff erupted during a period of rhyolitic volcanism coeval to the flood volcanism associated with the Columbia River Basalt Group. The High Rock Caldera Complex, Lake Owyhee and McDermitt volcanic fields account for ~90% of the rhyolites erupted between 16.7-15.0 Ma. Situated at the northern end of the Lake Owyhee volcanic field, the Dinner Creek Tuff was originally mapped as a ~2,000 km² single ignimbrite confined to the Malheur Gorge. Streck et al. (2015) correlated tuff outcrops previously mapped as generic Miocene welded tuff as well as local units such as the "Mascall" or "Pleasant Valley" …

Design Optimization For A Cnc Machine, Alin Resiga

Dissertations and Theses

Minimizing cost and optimization of nonlinear problems are important for industries in order to be competitive. The need of optimization strategies provides significant benefits for companies when providing quotes for products. Accurate and easily attained estimates allow for less waste, tighter tolerances, and better productivity. The Nelder-Mead Simplex method with exterior penalty functions was employed to solve optimum machining parameters. Two case studies were presented for optimizing cost and time for a multiple tools scenario. In this study, the optimum machining parameters for milling operations were investigated. Cutting speed and feed rate are considered as the most impactful design variables …

Quantifying Knickpoint Behavior And Erosion Mechanisms In An Urbanized Watershed, Bull Mountain, Washington County, Oregon, Max Gregory Bordal

Dissertations and Theses

Quantifying spatial and temporal patterns of rapid channelized erosion, on human time scales, is critical to understanding its processes and their consequences. This investigation utilized field observations, repeat terrestrial laser scanning (TLS), and Structure-from-Motion photogrammetry (SfM) to document the size and retreat rates of a knickpoint, defined as a localized near-vertical reach of a fluvial channel, and its contribution to erosion, in an urbanizing landscape with a loess substrate. The Bull Mountain area, in Washington County, southwest of Portland, Oregon, is an ideal study area, offering a measurable knickpoint that translates the response of the rapid erosion throughout this transient …

Making Room For Roses: The 1911 Relocation Of The Multnomah County Poor Farm, Kira Helene Lesley

Dissertations and Theses

From 1868 to 1911, the Multnomah County Poor Farm off Canyon Road in the Tualatin Hills housed indigent and sick residents of Portland and surrounding areas. In 1911, county officials relocated the Poor Farm from the West Hills flanking Portland to the far eastern portion of the county. Subsequently, the site hosted a municipal golf course and is currently home to the Oregon Zoo and Hoyt Arboretum. With no physical presence left, the original Poor Farm was quickly forgotten, and the reasons for its relocation have been obscured by the passage of time. Occasional references to the farm in newspapers …

Role Of Effective Quality Risk Management In Drug Safety Project, Bhawna Sharma

Dissertations and Theses

Identifying risk is one of the key topics of discussion in project planning and update meetings. Project managers have to identify and manage different risks at various levels of projects. These risks must be managed and eradicated in the effective and structured manner to perform effective quality risk management and thus leading to adequate project management. The research investigates the potential root cause of the quality risk management issues using tools such as the fishbone diagram (Ishikawa), 5-Whys, FTA etc. which could remedy this situation. An effectiveness check measure can also be implemented after applying corrective/preventive actions to ensure that …

The Role Of Culturally Responsive Pedagogy In The Preparation Of Secondary Teacher Candidates For Successful Teaching Of Diverse Learners: A Multiphase Mixed Methods Case Study, Rosalyn Taylor

Dissertations and Theses

The dramatic demographic shift occurring in this country makes it essential that our nation examines its policies, practices, and values as they relate to culturally diverse learners. That this student population remains underserved needs immediate attention. One arena that can become a part of the solution to the underachievement of diverse learners is teacher education and preparation programming.

The purpose of this research study was to give attention to this issue and to understand what an urban teacher education program (UTEP) with an educational equity and social justice mission does to prepare its secondary teacher candidates (STCs) to work successfully …

Health Risks In Medical Homes And Their Effects On Emergency Department And Inpatient Expenditures: A Focus On Patient-Centered Primary Care Homes In Oregon, Kweku Nyameyepa Wilson

Dissertations and Theses

The fragmented approaches to delivering health care services in the United States, along with the associated structural inefficiencies and unsustainable increases in health care costs affecting all payers, compel the need for reform. Various federal and state-level delivery system reform models have emerged in response.

The Medical Home (MH) is one of such reform models. In 2004 a national initiative entitled "The Future for Family Medicine Project" identified the lack of emphasis on comprehensive primary care, especially for chronic care patients, and proposed the introduction of MHs to improve comprehensive primary care delivery for every patient. Oregon's MH variant, the …

The Preparation Of Diaryliodonium Salts For Application In Arylation Chemistry, Thomas Ludwig Seidl

Dissertations and Theses

Diaryliodonium salts offer potential as novel reagents for arylation chemistry. An overall goal and successful outcome of this work has been to further understanding of diaryliodonium salt chemistry by developing practical methods that enable chemists more convenient access to these reagents, for the purpose of reaction development. To this end a robust and convenient preparation method has been developed and resulted in novel commercially available diaryliodonium salts. The remainder of the work described, has focused on understanding the parameters important to diaryliodonium mediated arylation and has resulted in a solid framework that multiple future development efforts can build upon.

A …

Food Waste Diversion Programming In Post-Secondary Education, Manar Arica Alattar

Dissertations and Theses

The urgent need for reform of USA and global food systems is evident in the pervasiveness of both food waste and food insecurity. Such an inefficient system strains the environmental, social, and economic systems on which it relies. Although policy and infrastructure changes are essential, consumers can play a significant role by decreasing their food waste, given that consumer waste represents 60% of the waste along the food cycle in developed countries. Incorporation of food literacy and food waste education in school curricula may provide a meaningful entry point for promoting food waste reduction skills.

This dissertation presents context on …

Modeling Spawning Habitat Potential For Chum (Onchorhynchus Keta) And Pink Salmon (O. Gorbuscha) In Relation To Landscape Characteristics In Coastal Southeast Alaska, Bernard Timothy Romey

Dissertations and Theses

In response to the increasing need for ecosystem services throughout the Southeast Alaska region, decision makers are tasked with balancing the need for natural resources with salmon conservation. However, accurate historical and current information on salmonid population abundance, freshwater distribution, and habitat quality are sparse with limited resolution for large portions of this remote and rugged landscape. Here, I created Intrinsic Potential (IP) models for chum and pink salmon to predict the potential for portions of coastal rivers to provide high-quality spawning habitat. I developed IP models for both species from field redd surveys and synthetic habitat variables derived from …

Perceived Overqualification And Withdrawal Among Seasonal Workers: Would Work Motivation Make A Difference?, Anthony Duy Nguyen

Dissertations and Theses

Overqualification is a concern for both individuals and organizations in today's workforce. It has been shown to relate to job attitudes, performance, well-being, and withdrawal. While plenty of research has been done on overqualification in the workplace, there is still a gap in the literature when it pertains to the contingent workforce, especially seasonal workers. These workers do not have secure employment and research has shown that they have distinct outcomes compared to full-time workers. Findings from past research about the relationship between overqualification and job withdrawal have been mixed, and this study aims to further the understanding of this …

Power Spectrum Prediction Of Amplified Dual-Band Lte-Advanced Signals, Xianzhen Yang

Dissertations and Theses

In wireless communication, the nonlinearity of a radio frequency (RF) power amplifier is an important issue for power amplifier designers. Since the nonlinearity is generated by the properties of physical components, it is hard to avoid it in producing power amplifiers. Power amplifier designers should know about the nonlinearity in order to compensate for it.

A two-tone test is a relatively widely used method to measure the nonlinearity of a power amplifier, which means the third order intercept point (IP3) can be measured from the two-tone test. Through the two-tone test, researchers have proposed some formulae to present what the …

Representations Of Feminist Theory And Gender Issues In Introductory-Level Sociology Textbooks, Jena Amber Zarza

Dissertations and Theses

A review of sociological literature reveals a long history of the study of gender, and an increased popularity in the application of feminist theories and ideas to sociological research. As transmitters of the discipline, introductory-level textbooks have been heavily studied over the past quarter-century to assess the accuracy with which they portray the field of sociology. In order to update the literature available on the topic, this study analyzed the current cohort of top-selling, introductory-level sociology textbooks for coverage of feminist theory and gender issues. Each of the ten textbooks was read cover-to-cover and coded for both latent and manifest …

Soil Phosphorus Characterization And Vulnerability To Release In Urban Stormwater Bioretention Facilities, Benjamin James Shetterly

Dissertations and Theses

Modern urban stormwater infrastructure includes vegetated bioretention facilities (BRFs) that are designed to detain water and pollutants. Phosphorus (P) is a pollutant in stormwater which can be retained in BRF soils in mineral, plant, and microbial pools. We explored soil properties and phosphorus forms in the soils of 16 operational BRFs in Portland, OR. Since soil hydrology can significantly impact P retention, we selected BRFs along an infiltration rate (IR) gradient. We conducted sequential fractionation and tests of P pools and measured P release in a subset of soils after drying and flooding samples for ten days. We hypothesized that …

Assessment Of Technology Adoption Potential Of Medical Devices: Case Of Wearable Sensor Products For Pervasive Care In Neurosurgery And Orthopedics, Liliya Stepanivna Hogaboam

Dissertations and Theses

Information and communication technologies hope to revolutionize the healthcare industry with innovative and affordable solutions with a focus on pervasive care. Wearable sensors products can provide monitoring in a natural environment with a constant stream of information, enriching healthcare practices and enabling better pervasive care.

Wearable sensor technologies could monitor patients' mobility, gait, tremor, daily activity and other health indicators in real time that could allow for simple, non-invasive, tracking of spine care that may lead to increased patient engagement, integration, feedback, post-surgery analysis, monitoring of patient's condition, patient's data extraction and analysis and possibly aiding in better diagnosis, intervention, …

Using The Syrian Civil War To Measure Hierarchy: Regional Power Transition In The Middle East, Eric Michael Clary

Dissertations and Theses

In 2018, the Syrian Civil War will enter into its ninth year of conflict. From an international relations perspective there are few, if any, studies on state actors in regional sub-state systems. What can an intrastate conflict teach us about future dynamics of the regional interstate hierarchy? It is worthwhile to examine The Syrian Civil War for three reasons. First, Syria lies in the heart of the Middle East lending proximity to regional actors. Second, the breakdown of order in Syria represents a microcosm of the global anarchic environment. Third, Syrian Civil War is an intrastate war that encapsulates both …

Effect Of Microbes On The Growth And Physiology Of The Dioecious Moss, Ceratodon Purpureus, Caitlin Ann Maraist

Dissertations and Theses

The microorganisms colonizing plants can have a significant effect on host phenotype, mediating such processes as pathogen resistance, stress tolerance, nutrient acquisition, growth, and reproduction. Research regarding plant-microbe interactions has focused almost exclusively on vascular plants, and we know comparatively little about how bryophytes -- including mosses, liverworts, and hornworts -- are influenced by their microbiomes. Ceratodon purpureus is a dioecious, cosmopolitan moss species that exhibits sex-specific fungal communities, yet we do not know whether these microbes have a differential effect on the growth and physiology of male and female genotypes. Using a common-garden design, we reared ten axenic genotypes …

"Agglutinating" A Family: Friedrich Max MüLler And The Development Of The Turanian Language Family Theory In Nineteenth-Century European Linguistics And Other Human Sciences, Preetham Sridharan

Dissertations and Theses

Some linguists in the nineteenth century argued for the existence of a "Turanian" family of languages in Eastern Europe and Northern Asia, claiming the common descent of a vast range of languages like Hungarian, Finnish, Turkish, Mongol, Manchu, and their relatives and dialects. Of such linguists, Friedrich Max Müller (1823-1900) was an important developer and popularizer of a version of the Turanian theory across Europe, given his influence as a German-born Oxford professor in Victorian England from the 1850s onwards. Although this theory lost ground in academic linguistics from the mid twentieth century, a pan-nationalist movement pushing for the political …

Hydrodynamic And Water Quality Modeling Of The Tigris River System In Iraq Using Ce-Qual-W2, Muhanned Al Murib

Dissertations and Theses

The Tigris River is one of two primary rivers in Iraq and is, along with the Euphrates, the main source for drinking and irrigation water in the country. The Tigris River originates in the Taurus Mountains in Turkey, and is 1850 km long. The majority of the river lies within Iraq. The river passes through, and is the primary drinking water source for major cities such as Mosul, Baeji, Samarra, Baghdad (the capital), and Kut. The Tigris River joins the Euphrates River in Qurna city within Basra province to form the Shatt Al-Arab River which eventually discharges into the Persian …

Urban Geocomputation: Two Studies On Urban Form And Its Role In Altering Climate, Jackson Lee Voelkel

Dissertations and Theses

Our climate and our cities are changing. Though their changes are not completely dependent upon one another, there is still a coupling effect between them. This study assesses the role of urban form as it pertains to elements of climate change. It is comprised of two essays intended for publication. The first of these essays addresses the feedbacks between urban form, energy consumption, and rising global temperatures. The second essay looks at one particular factor of urban form--tree type--as it pertains to air pollution and urban heat island mitigation. Both papers use the analytical approaches necessary to answer the questions …

Spacetime Numerical Techniques For The Wave And Schrödinger Equations, Paulina Ester Sepùlveda Salas

Dissertations and Theses

The most common tool for solving spacetime problems using finite elements is based on semidiscretization: discretizing in space by a finite element method and then advancing in time by a numerical scheme. Contrary to this standard procedure, in this dissertation we consider formulations where time is another coordinate of the domain. Therefore, spacetime problems can be studied as boundary value problems, where initial conditions are considered as part of the spacetime boundary conditions.

When seeking solutions to these problems, it is natural to ask what are the correct spaces of functions to choose, to obtain wellposedness. This motivates the study …

Assessing The Effects Of Climate Change And Fuel Treatments On Forest Dynamics And Wildfire In Dry Mixed-Conifer Forests Of The Inland West: Linking Landscape And Social Perspectives, Brooke Alyce Cassell

Dissertations and Theses

Over the past century in the western United States, warming has produced larger and more severe wildfires than previously recorded. General circulation models and their ensembles project continued increases in temperature and the proportion of precipitation falling as rain. Warmer and wetter conditions may change forest successional trajectories by modifying rates of vegetation establishment, competition, growth, reproduction, and mortality. Many questions remain regarding how these changes will occur across landscapes and how disturbances, such as wildfire, may interact with changes to climate and vegetation. Forest management is used to proactively modify forest structure and composition to improve fire resilience. Yet, …

Public Participation In Plant-Pollinator Conservation: Key Assessment Areas That Support Networked Restoration And Monitoring, Kerissa Battle

Dissertations and Theses

Environmental problems are growing at a pace and scale that traditional research methods alone can no longer tackle. Innovative research models that utilize contributory, participatory and crowdsourcing methods are rapidly emerging to fill this gap. For these participatory efforts to be effective and sustainable, however, closer attention must be paid to key components that can promote coordinated action and sustainability. Through the lens of public participation in plant-pollinator conservation, I have, with rigorous social-ecological inquiry, offered three foundational assessment areas that can provide scientific support to this nascent field: accuracy, ecological significance and scalability.

In the first study (Chapter 2), …

Whence And Whither: Acoustic Variability And Biogeography Of Tarsiers In North Sulawesi, Olivia Clare Kulander

Dissertations and Theses

The morning duet calls of eastern tarsiers (Tarsius spp.) in North Sulawesi were recorded and analyzed to examine the effects of geography and geologic history on their call structure. Tarsius species exhibit interspecifically variable duet calls shown to correlate with species differentiation and distribution. They are distributed across Sulawesi, a biogeographically complex island in the Indonesian archipelago, where tectonic activity and multiple glaciations during the Pleistocene generated and modified barriers to their dispersal and gene flow.

Recordings were made at ten locations from November of 2012 through June of 2014. Two locations were categorized as mainland, while eight island …

Evaluating The Impact Of Oregon's Citizen Initiative Review (Cir) On Voter Decisions, Ari Joaquin Wubbold

Dissertations and Theses

Voters are getting information from more and more sources. Along with this proliferation of sources has come an increasing distrust of traditional mass media. This has created a challenge for voters who seek reliable information when making decisions in the voting booth; including on ballot initiatives. Because voters tend to find ballot initiatives confusing and not easily informed by traditional party cues, the Citizen's Initiative Review (CIR) and the non-partisan, fact-based recommendations they produce have now spread into multiple states. This thesis seeks to gauge whether the CIR is effective at achieving the goals of increasing voter knowledge and encouraging …

Benevolent Sexism And Racial Stereotypes: Targets, Functions, And Consequences, Jean Marie Mcmahon

Dissertations and Theses

In this dissertation, I present three manuscripts in which I integrate race into an ambivalent sexism framework using experimental, correlational, and cross-sectional methods. The first paper tests whether a female's race acts as a subtype to differentially elicit benevolent sexism (BS). Two experiments demonstrated that BS is more strongly associated with White women than Black women. The second paper explores the relationship between protective paternalism (a subcomponent of BS), anti-minority attitudes, and threat. Threat was associated with stronger endorsement of protective paternalism and a corresponding increase in anti-minority attitudes, particularly for White men, implicating BS in the maintenance of racial …

A Spatial Analysis Of Ceramics In Northwestern Alaska: Studying Pre-Contact Gendered Use Of Space, Katelyn Elizabeth Braymer-Hayes

Dissertations and Theses

Activities and production among ethnographic Arctic peoples were primarily divided by gender. This gendered division of labor also extended to a spatial segregated pattern of the household in some Arctic cultures. Other cultures had a more gender-integrated spatial pattern of the household. There have been very few archaeological studies of gender in the Arctic, and even fewer studies of gendered use of space.

In this thesis, I evaluated the existence of this gendered use of space in pre-contact Northwest Alaska. I also evaluated the existence of discrete activity spaces. I drew from both ethnoarchaeology and gender/feminist archaeology to both construct …

Crystal Growth And Surface Modification Of Pyrite For Use As A Photovoltaic Material, Eric Rustad Young

Dissertations and Theses

Pyrite (FeS₂) has recently attracted significant interest as a photovoltaic material due to its promising optical properties, high photon to electron conversion yield, and low-cost raw materials. However, hopes have been tempered by recent discoveries that suggest the presence of hard to remove bulk sulfur defects. This research was focused on engineering and implementing the crystallization of pyrite from a sulfur rich solution to counteract the material's natural tendency to form bulk sulfur defects. Homoeptiaxial layers and single-crystal samples have been grown from tellurium sulfur melts with an Fe:S ratio of 1:4 using both natural and synthetic substrates. …

The Wildcat Creek Tuff, Eastern Oregon: Co-Eruption Of Crystal-Poor Rhyolite And Fe-Rich Andesite With Implication For Mafic Underpinnings To Voluminous A-Type Rhyolites, Hillarie Jaye Sales

Dissertations and Theses

The Wildcat Creek Tuff is a thin (~3-12 m), rhyolite to andesitic ash-flow tuff with a minimal extent of 1500 km² in Malheur county, eastern Oregon. The previously undated tuff yielded a single crystal, anorthoclase ⁴⁰Ar/³⁹Ar age of 15.49±0.02 Ma and thus is closely related to mafic and silicic volcanism of the Columbia River Province. The tuff texturally stands out by its high proportion of co-mingled mafic inclusions appearing as dark, scoriaceous, and phenocryst-poor fragments, and their proportion dictate bulk tuff compositions ranging from rhyolite (74% SiO2) to andesite (59% SiO₂). Glass analyses confirm …