Digital Commons Network^™

Passive Separation Of Binary Fluid Mixtures In Microchannels Using Lattice Boltzmann Method, Mohanad Kamil Radhi

Dissertations and Theses

Fluid mixtures in real life exist in two forms: miscible and immiscible. Separation of these mixtures using chemical agents or thermal energy has both environmental and economic disadvantages. The high cost and the environmental damage caused by the traditional separation techniques have stimulated both academia and industry to seek alternatives. The emergence of microfluidics offers robust solutions for a broad span of transport problems due to the high surface to volume ratio and reduced length scales. Particularly, the separation efficiency increases significantly due to the aforementioned feature. However, there is still a pressing need of passive separations for the sake …

Student Voice In A Participatory Design Process Focused On Developing Equity-Based Stem Teaching Practices, Frank Heimerdinger

Dissertations and Theses

The purpose of this study with second grade students in a mid-sized city in the Northwest was to examine an equity-based STEM teaching practice and design process that builds on student's voice in the context of an elementary school. Teaching practice innovations were designed using a participatory process drawing on student voice and experience, culturally responsive pedagogy, STEM content, and teaching practices. The students collaborated with the teacher to design and enact equity-based STEM teaching practice innovations and gave necessary and appropriate feedback regarding its efficacy in creating equitable and empowering learning experiences from their own perspective. A specific goal …

The Process Of Establishing Theoretically Grounded Measures Of Science And Chemistry Identity For Use In Undergraduate Chemistry Courses, Kathryn Nicole Hosbein

Dissertations and Theses

Identity has been theorized to aid in student persistence toward science, engineering, technology, and math (STEM) degrees. However, before we can explore the impacts of learning environments on identity, and subsequently persistence, robust measures that can aid in understanding how identity is fostered need to be available. This research study aims to create measures of identity by expanding an existing physics identity framework and contextualizing it to science and chemistry identities. Development of the measures was carried out through two distinct phases that provided evidence for reliability and multiple aspects of validity.

The first phase of the study used qualitative …

Local Radiance, Scott Peter Britell

Dissertations and Theses

Recent years have seen a proliferation of web applications based on content management systems (CMS). Using a CMS, non-technical content authors are able to define custom content types to support their needs. These content type names and the attribute names in each content type are typically domain-specific and meaningful to the content authors. The ability of a CMS to support a multitude of content types allows for endless creation and customization but also leads to a large amount of heterogeneity within a single application. While this meaningful heterogeneity is beneficial, it introduces the problem of how to write reusable functionality …

Bone Mineral Density Of The Common Bottlenose Dolphin, Tursiops Truncatus: A Proposed Model For Monitoring Osteological And Ecosystem Health, James Wright Burrus Powell

Dissertations and Theses

Bone mineral density (BMD) in the pectoral flipper of the common bottlenose dolphin, Tursiops truncatus, was examined to address the need to define a comprehensive target site for clinical osteodensitometric assessment and to establish ranges of observed bone density values for this species. Radii were analyzed using dual energy X-ray absorptiometry (DXA), the accepted standard in human medical studies. Multiple loci within the radius were identified and assessed for their correlation to BMD of the entire bone. Radii BMD were also examined for differences based on sex, age, total body length, handedness, geographical affinity, and nutritional status at time …

Optimizing On-Street Parking Supply With Analytical Models, Chawalit Tipagornwong

Dissertations and Theses

Commercial vehicles are crucial for the urban economy, but they generate negative impacts as well. This leads to restrictions such as a reduction in the number of loading zones. The result is that commercial drivers spend a significant amount of time searching for available loading zones. To avoid searching for parking, some commercial drivers double park, which causes traffic congestion. Therefore, the number of loading zones should be set properly. Since a curb is allocated between both loading zones and parking spaces, both parking types have to be considered. Many on-street parking management strategies have been implemented, including pricing meter …

Assessing The Efficacy Of Virtual Experiments In The General Chemistry Laboratory, Cory Jerome Hensen

Dissertations and Theses

As more students enroll in chemistry courses, institutions are faced with increasing costs and limited laboratory space to keep up with the demand. One solution some institutions have turned to is the incorporation of virtual experiments into the curriculum, as this can lower costs and increase the availability of laboratory space. Some institutions have offered sections that complete all of their experiments in a virtual environment, others have offered sections that alternate between a traditional hands-on experiment and a virtual experiment, and some institutions have replaced only select experiments throughout the curriculum with a virtual experiment. To begin to be …

Recruitment Marketing: How Do Wellness And Work-Life Benefits Influence Employer Image Perceptions, Organizational Attraction, And Job Pursuit Intentions?, Amy Christine Pytlovany

Dissertations and Theses

A global talent shortage is motivating employers to change the way they approach recruitment. To stay competitive, business leaders are strategizing new ways to attract employees and market their organizations to prospective employees. This research examined the impact of work-life and wellness programs on employer image perceptions (instrumental, symbolic, and experiential) and recruitment outcomes (organizational attraction and job pursuit intentions). It integrated these literatures to inform evidence-based organizational decision-making.

Study materials were developed with pilot testing conducted using Amazon Mechanical Turk (MTurk). Pilot 1 (N = 40) assessed the value of 32 types of benefits across traditional (e.g., health …

Support From Inside Out: Exploring Whether Various Social Supports Assist In Reducing Prison Rule Violations, Sarah Renee Lazzari

Dissertations and Theses

Scholars argue that prison rule violations are a way to assess whether individuals are engaging in prosocial behaviors. Individuals who engage in prosocial behaviors, during periods of incarceration, are less likely to engage in behaviors that result in official rule violations. Decreasing rule violations is one way to work towards a safer prison environment, while also preparing individuals for release. The current study uses cross-sectional data form the 2004 Survey of Inmates in State and Federal Facilities, in order to examine whether multiple types of prisons programs, which will be framed as various types of social supports, influence the frequency …

Attrition And Psychotherapy, Jesse Barrington Homan

Dissertations and Theses

Attrition in psychotherapy, also known as dropout, is a problem that affects clients who terminate, their families, therapists, mental health systems, and the overall community. Research on attrition is vast. However, the majority of this research has been done post hoc, relied on quantitative methods, and looked primarily at client demographic variables as the predictors of attrition. This has resulted in inconsistent findings, offers little to no useful information about attrition, and appears to blame clients for failed therapy. There has been little research on attrition from the perspective of clients who terminate. This study was designed to answer the …

What Happened To This Child? Identifying Factors That Influence The Identification And Categorization Of Child Maltreatment In The United States, Erika Tullberg

Dissertations and Theses

Background: Research has shown that adverse childhood experiences are strongly linked with health outcomes over the life course, and that child maltreatment – generally defined as physical abuse, sexual abuse, emotional maltreatment and neglect – can have an immediate, negative impact on child health and development and a longer-term impact on adolescent and adult health, including the leading causes of morbidity and mortality in the U.S. With such significant consequences, the accurate identification of child maltreatment is critical.

Child welfare caseworkers are charged with protecting the safety and fostering the well-being of children who have been identified as maltreated or …

Experiences Of Early Childhood Educators Working With Teaching Strategies Gold®: A Narrative Inquiry, Sarah Kathryn Guyon

Dissertations and Theses

Research regarding the effects of positive early childhood experiences on long term learning and success is drawing more attention to early childhood education programs than ever before. Promises on the federal and state level of better pay for early childhood educators and "high quality" publicly funded early childhood education programs is an exciting and long-awaited vision by both families and early childhood educators. However, with federal and state funding comes the need for justification of those funds through different measurement structures. One of the widely used measurement structures is the Teaching Strategies GOLD® preformatted, portfolio style assessment system. Teaching Strategies …

Investigating The Origins Of Toxins Present In Electronic Cigarette Aerosols, Shawna Vreeke

Dissertations and Theses

The purported safety of electronic cigarettes has come under scrutiny with the significant increase of lung related illnesses starting in the summer of 2019. Public view has started to shift towards understanding the potential negative health impact associated with these devices. While many investigations indicate probable hazards present in e-cigarette aerosols, inter-laboratory assessments are wide ranging and can be contradictory. Due to the novelty of this field, relatively little is known about these products. In this work, the identification and quantification of inhalation toxicants such as formaldehyde, acrolein, acetaldehyde and dihydroxyacetone are reported. Results of the investigation of the ability …

Spontaneous Recombination Of Short Rnas To Increase Length And Complexity In Prebiotically Plausible Conditions, Benedict Arthur Smail

Dissertations and Theses

The RNA World hypothesis is an influential theory of how life arose on earth which posits that the earliest life forms carried out essential activities with RNA catalysts instead of proteins. Substantial evidence to support this theory comes from among others, the fact that the ribosome is a ribozyme, the existence of small RNA catalysts capable of high activity, and self-assembling ribozymes such as the Azoarcus ribozyme. Additional support has been provided by the directed evolution of various ribozymes and the reputed prebiotic synthesis of nucleotides and small RNA oligomers. However, it has long been challenging to show how long …

Noncompliance With Land Acquisition In Vietnam: A Policy Tools Approach, Dang Van Nguyen

Dissertations and Theses

The Doi Moi policy (economic reform) launched in 1986 has resulted in economic boom for Vietnam. The nation with a population of around 95 million people recently joined the middle-income nation group and became a "major development success story." In the land sector, while the land ownership is controlled by the State, the privatization process of land rights has brought Vietnamese people five fundamental rights over land. To meet increasing demands of economic development and urban expansion, the central government of Vietnam (CGV) has implemented land-taking policy from early 1990s. The land acquisition policy, on the one hand, has attracted …

Family, School, And Forms Of Capital, Sonja Taylor

Dissertations and Theses

This dissertation contains three separate but related papers, each with a different focus. In the three papers, I sought to gain a deeper understanding of how different forms of cultural and social capital appeared in the relationship between families and schools. The first paper covers an interview study exploring how teachers in elementary school understood and used email to facilitate partnership with parents, a form of social capital that has the potential to benefit families from all class backgrounds. The second paper investigates the relationship between socioeconomic status, bonding social capital and cultural capital; I tested whether social capital affected …

The Many Wives Of General August V. Kautz: Colonization In The Pacific Northwest, 1853-1895, Nicole Ann Kindle

Dissertations and Theses

This thesis is about the colonization of the West, with an emphasis on the Pacific Northwest from 1853 to 1895. It analyzes the historical processes occurring as America expanded westward through the lens of the Kautz family. August Kautz and his wives tell the story of colonization through unique and vastly different ways. This thesis argues that a microanalysis of the Kautz family history tells a greater story of colonization, one rife with complicated layers influenced by race, class, and societal expectations that shaped individual roles within colonization.

August Kautz was a lieutenant when he first arrived in the Pacific …

Hypertension And Hiv In An Urban Slum Setting, Port-Au-Prince, Haiti, Olga Tymejczyk

Dissertations and Theses

Background: Rapidly growing urban slum settings increasingly face co-occurring communicable and non-communicable health crises, against the backdrop of extreme poverty, and social and environmental vulnerability. In Haiti, sparse data suggest a growing burden of hypertension and cardiovascular disease (CVD), along with substantial prevalence of HIV, increasingly recognized as a major CVD risk factor. As life-saving antiretroviral treatment (ART) is extended to more people living with HIV (PLWH), their risk of CVD increases with longer life expectancy and possibly cumulative ART exposure. Pregnant HIV-positive women may face additional cardiovascular vulnerability, due to the risk of gestational hypertension and pre-eclampsia. Integration of …

Trends In The Timeliness Of Hiv Diagnosis And Antiretroviral Treatment Initiation Before, During And After The “Treat All” Recommendation – New York City, 2006 - 2015, Mckaylee Robertson

Dissertations and Theses

BACKGROUND: Voluntary HIV testing followed by immediate antiretroviral treatment (ART) initiation (universal testing and treatment) has become an integral part of strategies to eliminate HIV and control the HIV/AIDS epidemic. Minimizing the time from HIV infection to ART initiation is essential for universal test and treatment to be optimally effective. In New York City, an epicenter of the HIV epidemic, the ‘treat all’ recommendation, immediate treatment for all people diagnosed with HIV, was made in late 2011, and efforts to ‘treat all’ were contemporaneous with large scale HIV testing initiatives in NYC. The overarching goal of this dissertation was to …

The Impact Of Integrating Traditional Ecological Knowledge In Summer Camps On Middle School Students' Understanding Of The Nature Of Science, SapoóQ'Is WiíIt'es Ciarra Solina Greene

Dissertations and Theses

The Nature of Science (NOS) and traditional ecological knowledge (TEK) have commonalities in the knowledge bases: they are both ways of explaining the natural world; founded on a set of practices and the historical accumulation of knowledge; and part of the education is learning practices and developing knowledge of the concepts that are foundational to the disciplines. Throughout the United States, schools are attempting to strengthen students' understanding of NOS through various approaches, although few have adopted the integration of TEK into curriculum. This research assesses two summer camps for middle school students that are science focused, one with TEK …

Fractals As Basis For Design And Critique, John Charles Driscoll

Dissertations and Theses

The design profession is responding to the complex systems represented by architecture and planning by increasingly incorporating the power of computer technology into the design process. This represents a paradigm shift, and requires that designers rise to the challenge of both embracing modern technologies to perform increasingly sophisticated tasks without compromising their objective to create meaningful and environmentally sensitive architecture. This dissertation investigated computer-based fractal tools applied within a traditional architectural charette towards a design process with the potential to address the complex issues architects and planners face today. We developed and presented an algorithm that draws heavily from fractal …

Audio Beat Detection With Application To Robot Drumming, Michael James Engstrom

Dissertations and Theses

This Drumming Robot thesis demonstrates the design of a robot which can play drums in rhythm to an external audio source. The audio source can be either a pre-recorded .wav file or a live sample .wav file from a microphone. The dominant beats-per-minute (BPM) of the audio would be extracted and the robot would drum in time to the BPM. A Fourier Analysis-based BPM detection algorithm, developed by Eric Scheirer (Tempo and beat analysis of acoustical musical signals)ⁱ was adopted and implemented. In contrast to other popular algorithms, the main advantage of Scheirer's algorithm is it has …

Urbanicity As A Moderator Of The Relationship Between Stigma And Well-Being Outcomes For Individuals With Serious Mental Illnesses, Emily Leickly

Dissertations and Theses

During the deinstitutionalization movement in the 1960s, community mental health centers and supportive and affordable housing for people with serious mental illnesses (SMI) was concentrated in economically disadvantaged urban centers. Today, these urban centers are becoming increasingly gentrified and unaffordable for people with SMI. Affordability is no longer synonymous with urban living, and supportive housing for people with SMI is increasingly found in non-urban areas. Given this shift, it is important to understand the potential impacts of non-urban living on people with SMI. Non-urban environments provide potential benefits for the general population, including reduced traffic and increased proximity to the …

Extreme Obesity Among Adults In The United States: Spatial Variation And The Association With Mortality, Carrie Mills

Dissertations and Theses

Objectives: The purpose of this dissertation was to create small area estimates to describe and explore the county-level spatial variation of extreme obesity among adults in the United States and to assess the county-level association and spatial variation of extreme obesity and mortality.

Methods: The Behavioral Risk Factor Surveillance System was used in conjunction with data from the Census Bureau to estimate county-level model-predicted prevalence of extreme obesity using multilevel regression and poststratification. Spatial dependence of estimates was assessed using global Moran’s Index, and local Moran’s Indices were used to identify clusters of higher and lower rates of extreme obesity …

Fault Deformation At The Base Of And Within The Crescent Formation Along The Dosewallips River, Olympic Mountains Peninsula, Washington, Usa, Christine Meryl Maher

Dissertations and Theses

The Olympic Mountains, in the cost ranges of northwest Washington, expose a Cenozoic accretionary complex east of the Cascadia Subduction Zone. Accreted material consists of metasedimentary deposits thrust eastward beneath a basaltic terrane (i.e., the basaltic Crescent Formation and the basal Blue Mountain Unit [BMU] turbidite) along a major fault, the Hurricane Ridge Fault (HRF). Recent isotopic dating of zircons from the BMU indicate that it is about 8 my younger than the basalt, implying another major fault may exist east of the HRF, between the BMU and the Crescent Fm. Field observations, data, and samples for microstructural analysis were …

Modeling And Control Of Magnetic Gear Dynamics In A Wind Turbine Drivetrain, Danielle Vournas

Dissertations and Theses

This thesis looks at the modeling and simulation of linear and nonlinear magnetic gear dynamics in a wind turbine drivetrain. The objective is to lay the groundwork for analysis, modeling and optimization of control structures focused on pole-slip prevention. A classical mechanical two-mass torsion spring model is used as the basis for developing the dynamic system equations and Simulink models. The wind turbine torque input to the low speed rotor is modeled as a disturbance input, the generator torque is modeled as a controlled input, and the high-speed rotor speed is the only measured output. The nonlinear dynamics are linearized; …

The Influence Of Age At Migration On Criminal Offending Among Foreign-Born Immigrants, Omar Melchor-Ayala

Dissertations and Theses

Domestic and international events -- such as the recent migrant caravans from Central and South America, and the records number of migrant children detained at the border -- have brought renewed attention to the adaptation of immigrants in the United States. More specifically, questions regarding whether the population of immigrants is driving the "crime problem," have taken center stage. Immigrants vary significantly in terms of when they migrate into the country. According to the Current Population Survey (CPS), the population of approximately 12 million foreign-born immigrant children living in the United States is split in terms of their age and …

Burdern Of Chronic Health Conditions And Healthcare Utilization Among Mobile Populations In Sub-Saharan Africa, Elizabeth M. Ortiz

Dissertations and Theses

Background: Much of public health research in sub-Saharan Africa on mobile occupations, such as truck drivers and sex workers, has focused on HIV risk. However, evidence is emerging to suggest that the HIV epidemic among these groups is coupled with a high prevalence of chronic health conditions (CHC), specifically hypertension, diabetes, and obesity. For people living with HIV, increased risk of CHC may also be linked to HIV-related chronic inflammatory cascade. In Africa, there has been little research on CHC risk factors or patterns of healthcare utilization among mobile populations. Therefore, the objectives of this study are to examine the …

Connecting Local-Scale Heavy Precipitation To Large-Scale Meteorological Patterns Over Portland, Oregon Using Observations And Climate Models, Christina Marie Aragon

Dissertations and Theses

Precipitation timing and magnitude is essential to human, ecological, and economic systems. Climate change may be altering the character of precipitation locally to globally, thus it is vital that resource managers, practitioners, and decision makers understand the nature of this change. This thesis was conducted in partnership with the City of Portland Bureau of Environmental Services (BES), and the Portland Water Bureau (PWB) in order to support resiliency planning around precipitation and precipitation extremes.

This work has two primary phases, which are discussed in chapter 2 and 3 of this thesis. The first phase of this research entails characterization of …

Stormwater Treatment Effectiveness Of Established Bioretention Facilities In Portland, Oregon, Emma Rose Kohlsmith

Dissertations and Theses

Bioretention systems are commonly used to treat and detain stormwater runoff and help mitigate for many negative effects of urbanization. Despite the widespread use of bioretention systems, few field-based studies have assessed how these facilities affect water quality many years after installation. The goal of this project is to assess the pollution reduction effectiveness of lined bioretention facilities that have been in use and functioning for 4-8 years. To meet this objective, this project measured water quality characteristics of stormwater flowing into and out of seven facilities installed throughout Portland, Oregon during real storm events. Stormwater grab samples were taken …