Digital Commons Network^™

Cyclic Loading Behavior Of Cfrp-Wrapped Non-Ductile Reinforced Concrete Beam-Column Joints, Ali S. H. Zerkane

Dissertations and Theses

Use of fiber reinforced polymer (FRP) material has been a good solution for many problems in many fields. FRP is available in different types (carbon and glass) and shapes (sheets, rods, and laminates). Civil engineers have used this material to overcome the weakness of concrete members that may have been caused by substandard design or due to changes in the load distribution or to correct the weakness of concrete structures over time specially those subjected to hostile weather conditions. The attachment of FRP material to concrete surfaces to promote the function of the concrete members within the frame system is …

Identifying Relationships Between Scientific Datasets, Abdussalam Alawini

Dissertations and Theses

Scientific datasets associated with a research project can proliferate over time as a result of activities such as sharing datasets among collaborators, extending existing datasets with new measurements, and extracting subsets of data for analysis. As such datasets begin to accumulate, it becomes increasingly difficult for a scientist to keep track of their derivation history, which complicates data sharing, provenance tracking, and scientific reproducibility. Understanding what relationships exist between datasets can help scientists recall their original derivation history. For instance, if dataset A is contained in dataset B, then the connection between A and B could be that A was …

Sablefish (Anoplopoma Fimbria) Scarcity And Zooarchaeological Data Quality In Northwest Coast Archaeological Sites, Reno Nims

Dissertations and Theses

Sablefish (Anoplopoma fimbria) is a scarcely represented species in Northwest Coast archaeology, but its remains are abundant at Tse-whit-zen, a large, Lower Elwha Klallam village in modern Port Angeles, WA that was occupied over the past 2,800 years. Because sablefish flesh has high nutritional value and it can be easily captured from nearshore waters in its juvenile form, sablefish should have been pursued where it was available. Therefore, the scarcity of sablefish in many Northwest Coast archaeological sites could indicate this species was not abundant in past fisheries. However, current zooarchaeological reports do not contain sufficient information on …

A Chemistry Neutral Flow Battery Performance Model Development, Validation, And Application, Alasdair James Crawford

Dissertations and Theses

A physical model for redox flow batteries is developed to estimate performance for any chemistry using parameters such as electrolyte conductivity and kinetic rate constants. The model returns the performance as a function of flow rate, current density, and state of charge. Two different models are developed to estimate the current density distribution throughout the electrode in order to evaluate physical performance of the battery. This is done using electrochemical parameters such as conductivity and kinetic rate constant. The models are analytical in order to produce a computationally cheap algorithm that can be used in optimization routines. This allows for …

Arsenic Mobilization From Silicic Volcanic Rocks In The Southern Willamette Valley, Gabriela Ribeiro De Sena Ferreira

Dissertations and Theses

Volcanic tuffs and tuffaceous sediments are frequently associated with elevated As groundwater concentrations even though their bulk As contents (~ 5 mg kg^-1; Savoie, 2013) are only marginally greater than the average crustal abundance of 4.8 mg g^-1 (Rudnick & Gao, 2003). Thus, As mobilization must be facilitated by conditions particular to these rocks. Alkaline desorption, anionic competition, reactive glass dissolution, and reductive dissolution of iron oxides are proposed processes of As release from volcanic rocks. Geogenic As contamination of groundwater in the southern Willamette Valley in western Oregon has been well-documented since the early 1960s, and …

Starts And Stops: Multimodal Practices For Walking As A Group In An Augmented Reality Place Based Game, Adam Mcfaul Jones

Dissertations and Theses

Augmented reality, place-based games utilize GPS-enabled maps and mobile media recording devices to shift traditional classroom activities into real-world contexts. AR-games for second language learning is a new field of research, and few studies have examined the kinds of face-to-face interactions players engage in during AR-games. Using intensive, multi-camera video data of English language learners playing an AR-game, ChronoOps, this thesis describes how groups start and stop walking during gameplay. The method used is conversation analysis, and this study draws from theories of embodied and distributed cognition, situated learning, and interactional competence Walking to and from various destinations as a …

Intrastate Armed Conflict And Peacebuilding In Nepal: An Assessment Of The Political And Economic Agency Of Women, Gyanu Gautam Luintel

Dissertations and Theses

The proliferation of intrastate armed conflicts has been one of the significant threats to global peace, security, and governance. Such conflicts may trigger resource exploitation, environmental degradation, human rights violations, human and drug trafficking, and terrorism. Women may suffer disproportionately from armed conflicts due to their unequal social status. While they endure the same effects of the conflict as the rest of the population, they also become targets of gender-based violence. However, women can also be active agents of armed conflict and perpetrate violence. Therefore, political and scientific communities at the national and international levels are now increasingly interested in …

Creating A Learning Continuum: A Critical Look At The Intersection Of Prior Knowledge, Outdoor Education, And Next Generation Science Standards Disciplinary Core Ideas And Practices, Trisha Leigh Schlobohm

Dissertations and Theses

Outdoor School is a cherished educational tradition in the Portland, OR region. This program's success is attributed to its presumed ability to positively impact affective and cognitive student outcomes. Residential programs such as Outdoor School are considered to be an important supplement to the classroom model of learning because they offer an authentic, contextually rich learning environment. References to relevant literature support the idea that student gains in affective and cognitive domains occur as a result of the multi-sensory, enjoyable, hands-on nature of outdoor learning. The sample population for this study was 115 sixth graders from a demographically diverse Portland, …

A Relevance Rule Organizing Responsive Behavior During Projectably Multi-Unit Tellings, Anri Zama

Dissertations and Theses

Research on projectably multi-unit tellings (e.g., stories) has largely focused on their contexts of emergence, beginnings, endings, and uptakes (or lack thereof), rather than on their ‘middles.’ The relatively small literature on such ‘middles’ has focused on different types of responsive behaviors when they do occur (e.g., continuers). However, there is virtually no research on relevance rules that might systematically organize these ‘middles,’ including the production of responsive behaviors (or lack thereof) and the management of intersubjectivity. This thesis describes and defends one such relevance rule: Advisors are strongly accountable for responding – either vocally and/or nonvocally – at each …

Desirable Conversations: Sexuality And Women With Intellectual Disabilities, Neera Malhotra

Dissertations and Theses

The American Association of Intellectual and Developmental Disabilities (AAIDD, 2011) assert that individuals with intellectual disabilities, irrespective of gender, have an equal right to learn about and experience their own sexuality. A review of the extant literature indicated that the voices of women with intellectual disabilities on the topic of familial culture, as it relates to sexuality, are rarely included (McCarthy, 1993; Shakespeare, 2000; Siebers, 2012).

The purpose of this qualitative study was to examine the role of familial culture and lived experiences of women with intellectual disabilities, ages 21-35, in understanding their own sexuality. Eight women participated in individual …

Information Representation And Computation Of Spike Trains In Reservoir Computing Systems With Spiking Neurons And Analog Neurons, Amin Almassian

Dissertations and Theses

Real-time processing of space-and-time-variant signals is imperative for perception and real-world problem-solving. In the brain, spatio-temporal stimuli are converted into spike trains by sensory neurons and projected to the neurons in subcortical and cortical layers for further processing.

Reservoir Computing (RC) is a neural computation paradigm that is inspired by cortical Neural Networks (NN). It is promising for real-time, on-line computation of spatio-temporal signals. An RC system incorporates a Recurrent Neural Network (RNN) called reservoir, the state of which is changed by a trajectory of perturbations caused by a spatio-temporal input sequence. A trained, non- recurrent, linear readout-layer interprets the …

Behavior Of Prestressed Concrete Beams With Cfrp Strands, Yasir Matloob Saeed

Dissertations and Theses

The high cost of repairing reinforced or prestressed concrete structures due to steel corrosion has driven engineers to look for solutions. Much research has been conducted over the last two decades to evaluate the use of Fiber Reinforced Polymers (FRPs) in concrete structures. Structural engineering researchers have been testing FRP to determine their usability instead of steel for strengthening existing reinforced concrete structures, reinforcing new concrete members, and for prestressed concrete applications. The high strength-to-weight ratio of FRP materials, especially Carbon FRP (CFRP), and their non-corrosive nature are probably the most attractive features of FRPs.

In this study, an experimental …

Consistency Analysis For Judgment Quantification In Hierarchical Decision Model, Mustafa Sulaiman Abbas

Dissertations and Theses

The objective of this research is to establish consistency thresholds linked to alpha (α) levels for HDM’s (Hierarchical Decision Model) judgment quantification method. Measuring consistency in order to control it is a crucial and inseparable part of any AHP/HDM experiment. The researchers on the subject recommend establishing thresholds that are statistically based on hypothesis testing, and are linked to the number of decision variables and (α) level. Such thresholds provide the means with which to evaluate the soundness and validity of an AHP/HDM decision. The linkage of thresholds to (α) levels allows the decision makers to set an appropriate inconsistency …

Exploring Transnational Economic, Social, And Political Participation Of Mexican Immigrants In Oregon, Anabel López Salinas

Dissertations and Theses

Using a mixed methods approach and expanding on the literature on immigrants' transnational civic engagement, this research explores the paths and barriers to Mexican immigrant civic, economic, political, and social engagement in both immigrants' communities of origin in Mexico and communities of residence in Oregon, a relatively new destination for Mexican immigrants. The majority of the adult Mexican population only arrived to the state of Oregon over the last 15 years. Today Latinos represent the largest racial-ethnic minority, twelve percent of the state population, with Mexicans making up 90 percent of this Latino population. Most of the Mexican immigrants in …

Finding The Missing Links: A Comparison Of Social Network Analysis Methods, Shawn James Mehess

Dissertations and Theses

Too many students leave school without even the essential skills (ACT, 2011), and many others are so drained by the experience they lack a desire to continue on to a post-secondary education. Academic engagement has emerged as a construct representing students’ personal investment in school (Greenwood, Delquadri, & Hall, 1984), and may be a psychological variable which can be intervened on. However, interventions must occur as quickly as possible to maximize their efficiency (Heckman, 2007). Students’ peer groups may be a particularly potent venue of intervention, however several options exist for how to go about measuring their social networks.

In …

The Kazaks Of Istanbul: A Case Of Social Cohesion, Economic Breakdown And The Search For A Moral Economy, Daniel Marc Auger

Dissertations and Theses

This research is focused on understanding the ways in which the community orientation of the Kazak ethnic community in Istanbul, Turkey have contributed to their economic success which in turn encourages strong community, and the nature of their community-based support networks for providing material and cultural support. It examines the role of social capital and cohesion in maintaining the community with its positive implications for the continued building of wealth or sourcing of funding on a community level. The theoretical concepts relevant to this project are based on the ideas that the shared values of a community are a positive …

Substantive Representation By The Unelected: The Role Of Staff Gender On Mayoral Priorities In U.S. Cities, Sara M. Hottman

Dissertations and Theses

The literature on descriptive and substantive representation focuses on elected representatives, but overlooks the gender of those who play an integral role in policy process (agenda-setting) and outcomes (implementation): The elected’s chief of staff, senior policy advisors, and, in council-manager systems, the city manager. This thesis examines the role policy staff and city manager gender plays in substantive representation. After analyzing staff composition and agenda priorities — gleaned from State of the City addresses — for mayors of the 50 most-populous cities in the United States, I found substantial evidence to support my hypotheses that the chief of staff’s gender, …

Is Scholarship Advancing?: An Analysis Of Fifteen Years Of Framing Research, Joseph Zachary Provencher

Dissertations and Theses

In 2011, Porismita Borah published "Conceptual Issues in Framing Theory: A Systematic Examination of a Decade’s Literature" to shed light on the status of framing research, and attempt to answer several scholars' criticisms of framing research practices (Carragee and Roefs 2004, D'Angelo, 2002, Entman, 1993). Borah argues that framing research has several areas of necessary improvement, and her prescription is for future research to be able to examine specific framing issues or effects, but also be able to connect with broader understandings of framing.

The following content analysis of framing research, conducted between the year 2000 and 2013, seeks to …

Cyclist Path Choices Through Shared Space Intersections In England, Allison Boyce Duncan

Dissertations and Theses

In the last several years, there has been growing worldwide interest in making streets safer for all users--pedestrians, cyclists, and motorists. One approach, shared space, is a traffic calming technique as well as urban design concept. This technique strives to fully integrate the roadway into the urban fabric by removing elements such as lane markings, curbs, and traffic signs. By removing these elements and creating a more plaza-like space, these sites become ambiguous and no user group as priority. The technique is relatively new, and the majority of existing research concerns pedestrians only. This mixed methods research focused on six …

Women As Transformational Leaders: Learning To Lead In The Community College, Jennifer R. Grove-Heuser

Dissertations and Theses

Community colleges face a growing crisis in leadership and a critical aspect of this crisis is a shortage of leaders. The representation of women leaders in community colleges has increased more than other sector of higher education. This upswing suggests that community colleges are the most likely place for women to achieve executive leadership status. Yet, community college history is grounded in male dominance and women leaders remain marginalized in the community college system. The purpose of my study was to examine some of the factors that contribute to women executive leaders' success specifically: (a) how women experience their leadership …

Growing Stem Education On The Playground: A Case Study Of The Factors That Influence Teachers’ Use Of School Gardens, Megan Poole

Dissertations and Theses

School gardens can have a profound, positive influence on a student's academic achievement, social skills, and attitudinal orientation. Despite these clear benefits, the use of school gardens as an instructional medium is not as prevalent as would be expected. There are several types of obstacles that can prevent teachers from using school gardens, including facets of time, support, and knowledge-based challenges. This multiple case study employs a mixed methods design to uncover factors that influence primary school teachers' decisions to utilize a school garden in their STEM curriculum. The goals of this study were to determine the types of benefits …

Learning Through Nature: A Study Of A Next Generation Science Standards Based Teacher Workshop That Blends Outdoor Learning Experiences With Formal Science, Ashley Fanning

Dissertations and Theses

Many teachers lack the confidence and knowledge to transition their classroom science lessons to an outdoor setting. Very few teacher professional development (PD) programs focus on improving teachers' self-efficacy and pedagogical content knowledge (PCK) that is needed to enhance their science curriculum with outdoor lessons. This study examined an exception: The Connect2Science workshops, which provided elementary teachers the opportunity to experience nature-based science lessons. My research question for this study is: In what ways does a professional development workshop focused around the Next Generation Science Standards influence teachers': a) self-efficacy in teaching science outdoors and b) science pedagogical content knowledge? …

The Design Of A Simple, Spiking Sparse Coding Algorithm For Memristive Hardware, Walt Woods

Dissertations and Theses

Calculating a sparse code for signals with high dimensionality, such as high-resolution images, takes substantial time to compute on a traditional computer architecture. Memristors present the opportunity to combine storage and computing elements into a single, compact device, drastically reducing the area required to perform these calculations. This work focused on the analysis of two existing sparse coding architectures, one of which utilizes memristors, as well as the design of a new, third architecture that employs a memristive crossbar. These architectures implement either a non-spiking or spiking variety of sparse coding based on the Locally Competitive Algorithm (LCA) introduced by …

Tryon Trekkers: An Evaluation Of A Stem Based Afterschool Program For At-Risk Youth, Chessa Eckels Anderson

Dissertations and Theses

This study contributed to the body of research that supports a holistic model of afterschool learning through the design of an afterschool intervention that benefits elementary school students of low socioeconomic status. This qualitative study evaluated a science focused afterschool curriculum that was designed using principles from Risk and Resiliency Theory, academic motivation theories, science core ideas from the Next Generation Science Standards, and used environmental education philosophy. The research question of this study is: how does an outdoor and STEM based afterschool program impact at-risk students' self-efficacy, belonging and engagement and ability to apply conceptual knowledge of environmental science …

Acid-Base Equilibria In Organic-Solvent/Water Mixtures And Their Relevance To Gas/Particle Partitioning In The Atmosphere And In Tobacco Smoke, Julia Lynn Degagne

Dissertations and Theses

Acid-base equilibria in organic particulate matter (PM) are poorly understood, but have important implications for air quality and public health. First, acid-base reactions in organic particulate matter affect the gas/particle partitioning of organic compounds in the atmosphere, and these processes are not currently represented in atmospheric and climate change models. Second, the acid-base balance of tobacco smoke affects the amount of nicotine absorbed by the smoker, and a greater understanding of this balance would help to relate cigarette smoke composition to the addictive properties of cigarettes. This work presents data related to both air quality and tobacco smoke modeling.

The …

"Like Drinking Water Out Of A Fire Hydrant" Medical Education As Transformation: A Naturalistic Inquiry Into The Physician Assistant Student Experience, Patricia Kenney-Moore

Dissertations and Theses

Physician assistants are medical professionals educated in an allopathic medical education model in the United States. In order to successfully matriculate, educate and graduate safe and effective health care providers in a 2-year time frame, the 4-year M.D. curriculum has been abbreviated and condensed leading to an intense, full-time cohort educational experience that taxes physician assistant students to their limits. The demanding workload can lead to fluctuations in mood and morale along with increased levels of psychological distress. This dissertation explores this under examined student experience by first introducing the physician assistant profession and the process by which it educates …

An Investigation Into Intermediate Grades Teachers' Noticing Of The Mathematical Quality Of Instruction, Krista Lynn Strand

Dissertations and Theses

The Mathematical Quality of Instruction (MQI) is an important feature of a classroom mathematics lesson. Before teachers can strengthen the MQI of their own lessons, however, teachers must first be able to notice MQI-related features of instruction. The purpose of this dissertation is to investigate intermediate grades teachers’ MQI-related noticing as they go through a ten-week research-based MQI professional development (PD) program. Specifically, this dissertation is guided by two research questions: (1) How do individual teachers’ noticing of MQI-related features of instruction shift as they go through an MQI-focused professional development program? and (2) How do teachers approach the task …

The Impact Of Daily 5 And Cafe Literacy Framework On Reading Comprehension In Struggling Fourth Grade Readers: A Case Study, Sandra Lee Duty

Dissertations and Theses

For decades, struggling readers have been a central focus of American public schools. In the United States, many students who struggle with reading comprehension are not receiving high-quality instruction that ensures comprehension of text. Elementary teachers are faced with the challenge of how to structure and organize literacy instruction that ensures growth in reading comprehension for struggling students.

The purpose of this case study is to explore the impact of a reading framework on fourth grade struggling students’ reading comprehension, attitudes and engagement. This case study looks specifically at the impact of the Daily 5 and CAFÉ literacy framework that …

A Systems Approach To Stress And Resilience In Humans: Mindfulness Meditation, Aging, And Cognitive Function, Barry S. Oken

Dissertations and Theses

Psychological stress is common and contributes to many physical and mental health problems. Its effects are mediated by a complex neurobiological system centering in the brain with effectors including autonomic nervous system, hypothalamic-pituitary-adrenal axis, inflammatory system, and gene expression. A stressor pushes the human physiological system away from its baseline state towards a lower utility state. The physiological system may return towards the original state but may be shifted to a lower utility state. While some physiological changes induced by stressors may benefit health, chronic stressors usually have negative effects on health. In contrast to this stressor effect is the …

Assessing Sense Of Place And Geo-Literacy Indicators As Learning Outcomes Of An International Teacher Professional Development Program, Nancee Hunter

Dissertations and Theses

This research explores the multifaceted benefits that accrue from learning within an international, experiential context. It uses a qualitative, case study approach employing pre and post surveys, in-situ observations, and semi-structured photo-elicitation interviews to analyze the Center for Geography Education in Oregon’s (C-GEO) 2013 Overseas Teacher Institute--a professional development program that took 11 teachers to Russia, Mongolia, and China for a total of 17 days (plus two additional travel days) to learn about the cultural and physical geography of each place. The focus of the research is two-fold and examines processes involved in gaining, synthesizing and applying 1) a sense …