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Trajectories Of Initiation For The Heroin-Based Drug Whoonga – Qualitative Evidence From South Africa, Griffin A. Tyree, Nzwakie Mosery, Elizabeth F. Closson, Zonke Mabude, Carol Du Toit, David Bangsberg, Steven A. Safren, Kenneth H. Mayer, Jennifer A. Smit, Matthew J. Mimiaga, David J. Grelotti

OHSU-PSU School of Public Health Faculty Publications and Presentations

Background: Whoonga is a smoked heroin-based street drug that first emerged in South Africa a decade ago. While previous scientific reports suggest that use is growing and youth are particularly vulnerable, trajectories of initiation are not well characterized. Methods: In 2015, 30 men undergoing residential addiction treatment for this smoked heroin drug in KwaZulu-Natal, South Africa participated in semi-structured interviews about their experiences using the drug. Interview data were coded using qualitative content analysis. Results: Participant trajectories to initiating smoked heroin were “vertical” in the context of marijuana use or “horizontal” in the context of other hard drug use. Participants …

Eagle Creek Post-Fire Monitoring For Water Temperature & Water Stage, Sylas Daughtrey

Environmental Science and Management Professional Master's Project Reports

When investigating forested watersheds devastated by wildfire, the wide range of disturbance can lead to altering hydrological effects through the loss in ground cover vegetation, canopy cover, while also disrupting soil characteristics. Within the Pacific Northwest, forested drainages affected by post-fire disturbance are further altered in areas that experience seasonal rainfall and snow melt events. When looking at the post-fire sloped areas of Eagle Creek and Tanner Creek within the Columbia Gorge of Oregon, the loss of ground cover and organic matter throughout these two watersheds pose a legitimate concern for erosion events as well as hydrological changes due to …

Fifth Year Persisters: High School, College, And Early Career Outcomes For Persisting Non-Graduates, Mathew C. Uretsky, Angela K. Henneberger

School of Social Work Faculty Publications and Presentations

There is limited extant knowledge regarding academic and workforce experiences of students who remain engaged in high school, but do not graduate in the traditional four years. The current study used Multilevel modeling and descriptive statistics with statewide linked longitudinal administrative data (N = 2917) to (1) examine the student- and school-level factors related to earning a diploma during the fifth year of high school and (2) describe proximate academic and career outcomes for non-graduates and fifth year graduates. Multiple student-level factors were associated with increased likelihood of earning a diploma in the fifth year (e.g. special education eligibility, passing …

Assessing Well-Being Of Asian Elephants (Elephas Maximus) Through Major Events And Transitions, With Development And Aging, And Husbandry Changes, Sharon Stuart Glaeser

Dissertations and Theses

In this body of research, reproductive and adrenal hormones and behavior were used to evaluate individual and group responses to physiological, social, and environmental changes in zoo-housed Asian elephants, considering factors of sex, age, and life stage. Animals experience physiological, social, and environmental changes as part of their natural history and individual life experience. Measures of both positive and negative states are needed to assess the impact of these changes at the individual and group level. Such measures can help us better understand how animals cope with a changing environment, and can help inform management decisions. Through longitudinal analyses of …

Lectures On Mathematical Computing With Python, Jay Gopalakrishnan

PDXOpen: Open Educational Resources

This open resource is a collection of class activities for use in undergraduate courses aimed at teaching mathematical computing, and computational thinking in general, using the python programming language. It was developed for a second-year course (MTH 271) revamped for a new undergraduate program in data science at Portland State University. The activities are designed to guide students' use of python modules effectively for scientific computation, data analysis, and visualization.

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Synthesizing Expressive Behaviors For Humanoid Robots, Mathias Irwan Sunardi

Dissertations and Theses

Humanoid robots are expected to be able to communicate with expressive gestures at the same level of proficiency as humans. However, creating expressive gestures for humanoid robots is difficult and time consuming due to the high number of degrees of freedom (DOF) and the iterations needed to get the desired expressiveness.

Current robot motion editing software has varying levels of sophistication of motion editing tools ranging from basic ones that are text-only, to ones that provide graphical user interfaces (GUIs) which incorporate advanced features, such as curve editors and inverse kinematics. These tools enable users to create simple motions; but …

Energy Stores And Life-History Transitions In Red-Sided Garter Snakes (Thamnophis Sirtalis Parietalis), Rachel Catharine Wilson

Dissertations and Theses

All organisms must prioritize investment in either reproductive or self-maintenance activities. Despite this established paradigm, our understanding of how organisms choose to prioritize certain behaviors and physiologies over others remains limited. It is likely that an organism's energy status not only influences variation in reproductive effort, but also transitions to and from reproductive activities. My dissertation aims to investigate how energy metrics (body condition index, adipocyte follicle size, and liver glycogen) relate to reproduction and associated life-history stages in red-sided garter snakes (Thamnophis sirtalis parietalis). Chapter two examines if energy metrics differ with migratory status and sex in …

The Experience Of Female Caregivers In The Kingdom Of Saudi Arabia, Nouf Albugami

Dissertations and Theses

In the Kingdom of Saudi Arabia ("KSA"), a minimal amount of research concerning the availability and level of social support specifically targeting the female caregiver has been conducted. Moreover, the extent to which social support has helped alleviate both the physical and psychological stress of caregiving has been studied very little, if at all. In light of this limited amount of research, the goals of this study are to investigate the following two questions: (1) What is the experience of female caregivers with chronically ill children in KSA, and (2) What is the nature and availability of social support among …

Mixed Plate: Exploring Multiracial Student Identities Within Higher Education, Haley K. M. Okamoto

PSU McNair Scholars Online Journal

Race has primarily been studied from a monoracial perspective, which prohibits multiracial individuals from expressing themselves because their racial identity does not fit into the neatly, pre-established monoracial categories. Previous research has found that multiracial students experience life in ways that are unique compared to their monoracial peers. Multiracial students are often required to conform to socially constructed monoracial boxes and have negative experiences surrounding racial identity development, racism/microaggressions, and lack of demographic categorization. The multiracial population in America is steadily growing, and if current trends persist, will only continue to do so. As a result, an increased number of …

Intimate Partner Violence Risk Assessment: The Additive Value Of Victim Reported Risk, Jennifer Joanne Johnson

Dissertations and Theses

Intimate partner violence (IPV) affects millions of people in the United States, causing negative generational consequences to the victim and the community. The criminal justice system has increased its preventative strategies to combat this issue through mandatory arrest laws and the use of risk assessment tools for determining the likelihood of offender recidivism. Risk factors included in standardized and actuarial risk assessment tools have been found to be relatively good predictors for violent recidivism.

This study assesses the predictive accuracy of risk factors through bivariate correlations and multiple logistic regression analysis. The risk factors analyzed include demographic information, mental health …

"Not 'Just' A Barista": The Story Of Portland's College-Educated Baristas, Ned William Tilbrook

Dissertations and Theses

This paper examines graduate jobs/skills mismatch in craft occupations, through semi-structured interviews with college-educated baristas working in local and craft coffee shops in Portland, Oregon. This paper asks why college educated people work in such a role as it represents an interesting example of job/skills mismatch. Findings suggest that some see it as a good stop-gap on the way to something else, while others hope to use the skills they learned in studying for their degree to forge a career in the coffee industry. A desire to use these degree-relevant skills is prevalent throughout the sample, however many are still …

A Computer Science Academic Vocabulary List, David Roesler

Dissertations and Theses

This thesis documents the development of the Computer Science Academic Vocabulary List (CSAVL), a pedagogical tool intended for use by English-for-specific-purpose educators and material developers. A 3.5-million-word corpus of academic computer science textbooks and journal articles was developed in order to produce the CSAVL. This study draws on the improved methodologies used in the creation of recent lemma-based word lists such as the Academic Vocabulary List (AVL) and the Medical Academic Vocabulary List (MAVL), which take into account the discipline-specific meanings of academic vocabulary. The CSAVL provides specific information for each entry, including part of speech and CS-specific meanings in …

Short- And Long-Term Impacts Of A Deliberative Pedagogy In Introductory Biology And Chemistry Courses, Liz Rain-Griffith

Dissertations and Theses

There have been multiple national calls for curricular reform in college-level science, technology, engineering, and mathematics (STEM), including a need to instill democratic skills in students. Democratic skill building can be embedded in STEM classrooms through intentional "deliberative pedagogies" which include skills in: communication, collaboration, and application. We developed and implemented a deliberative pedagogy, Deliberative Democracy (DD), across introductory majors and non-majors biology courses and a majors chemistry course. In two separate studies, I took a longitudinal, qualitative research approach to understand introductory biology and chemistry students' experiences and perceptions of DD. For the first study, I tracked a cohort …

Statistical Modeling Of Historical Daily Water Temperatures In The Lower Columbia River, Malia Hanae Scott

Dissertations and Theses

Water temperature affects numerous aspects of aquatic life, and its stability is critical to cold water fish such as salmonids. With rising anthropogenic influence in natural environments, the future existence of these organisms is becoming less certain. In this study, I examined the evolution of historical water temperatures in the lower Columbia River by creating a statistical model to estimate daily historical water temperatures between the 1850s and 2010s. Daily air temperature and river flow measurements were used as inputs to the model, which estimated daily water temperatures at Bonneville Dam. The model used time lags between air temperature and …

Variability In Historical Fire Patterns Of A Moist Mixed-Conifer Forest In The Northern Blue Mountains Of Oregon, Laura Marie Platt

Dissertations and Theses

High variability in historical fire patterns characteristic to mixed-severity fire regimes is expected to have contributed to a structurally heterogeneous landscape throughout much of the forested ecosystems of the western United States. After more than a hundred years of fire exclusion in the region, many forests have shifted to a more homogeneous structure, which raises concern regarding these forests' ability to sustain expected increases in fire activity with a warming climate. The shift is not uniform across the west, however, and differences in historical disturbance patterns and changes due to land management are not well characterized in forests across a …

Determinants Of Student Information Technology Adoption, Hans P. Vanderschaaf

Dissertations and Theses

Innovating service delivery in higher education is central to supporting institutional and societal goals of increasing the numbers of college graduates and for transforming higher education institutions to center on the needs of today's students. Within this context, technology plays a critical role. This research seeks to contribute to institutional, academic and educational technology sector efforts to dramatically enhance service quality, in support of improving undergraduate student outcomes (student success), by identifying the determinants of student information technology adoption and removing barriers to accessing higher education.

Using a mixed-methods and empirical approach based on the Unified Theory of Acceptance and …

No Oxygen, No Water: The Unique Physiology Of Annual Killifish Embryos Across Development, Daniel Erik Zajic

Dissertations and Theses

For most vertebrates, an abundance of oxygen is necessary for the production of ATP and the maintenance of cellular homeostasis. The absence of oxygen, even for brief periods, quickly leads to ATP depletion which can lead to irreparable damages to sensitive organs, such as the brain and heart. However, certain vertebrates demonstrate an extraordinary ability to thrive and recover fully from periods of no oxygen (anoxia). The annual killifish (Austrofundulus limnaeus) lives in ephemeral ponds in the Maracaibo basin of Venezuela and their embryos have the remarkable ability to not only survive anoxic periods for months, but also …

Guided Reinvention As A Context For Investigating Students' Thinking About Mathematical Language And For Supporting Students In Gaining Fluency, Kristen Vroom

Dissertations and Theses

Fluency with mathematical language is important for students' engagement in many disciplinary practices such as defining, conjecturing, and proving; yet, there is growing evidence that mathematical language is challenging for undergraduate students. This dissertation study draws on two design experiments with pairs of students who were supported to encode their mathematical meanings with more formal language. I aimed to investigate the teaching and learning of mathematical language, and particularly the language in statements with multiple quantifiers, by engaging students in this type of activity. In the first paper, I investigated the complex ways in which the students in my study …

Mechanics Of Canopy Turbulence, Hawwa Falih Kadum

Dissertations and Theses

Large canopies interact with the atmospheric boundary layer (ABL) and alter transport of matter, energy, and momentum in accordance to their morphology. Canopy structure influence on turbulent processes can be utilized to achieve favorable interactions. Wind farm and forest canopies spatial arrangement is investigated in this work. Momentum fluxes investigated in a horizontal axis wind turbine (HAWT) array showed the existence of gusts of wind transported both from ABL above the canopy and the unperturbed flow below the canopy through sweep and ejection events. A new wind farm arrangement in which clusters of vertical axis wind turbines (VAWT) are collocated …

Correctional Quackery: A Study Of Program Availability And Inmate Assaults In Adult Correctional Facilities, Casey Jay Legere

Dissertations and Theses

A wide variety of correctional programs have incited a debate regarding the utility and worth of programs within the correctional system. For some, programs are assigned strict qualifications and this narrow focus limits those that are "worthy"; all else are "correctional quackery." These harsh limitations do not allow for the consideration of secondary outcomes as measurements of value. Using negative binomial regression, this study examines 449 state correctional facilities to consider associations between program availability (categorized as correctional quackery or not) and incidence rates of violent assaults among inmates. The minimal significant results yield inconclusive findings but do offer some …

Identifying Typologies Of Failure To Appear, Ciara Mcglynn

Dissertations and Theses

Empirically tracking when defendants fail to appear (FTA) for their court date is important for virtually all court systems. Factors related to FTA can inform court decision-making. Developing a typology of FTAs may provide added accuracy in pretrial detention decisions and using pretrial risk assessments. The current exploratory study expands on current knowledge of factors associated with FTA by identifying profiles of those most likely to fail to appear, and comparing with profiles of those who do show up for their court date. Seven cluster profiles were established for FTAs, and eight cluster profiles were established for non-FTAs. While there …

So Many Choices: An Experimental Study Of Digital Television Choice, Customization, And Satisfaction, Johanna Lee Hoener

Dissertations and Theses

Internet streaming television is increasingly available in society and is changing the way television is viewed by creating more and more choices for consumers. We no longer watch the same three channels on television, now the consumer controls when, where, and what to watch. Producers of this digital media landscape provide customization mechanisms that consumers also engage in, creating tailored presentations of content.

This study seeks to understand what the large landscape of choice does to our satisfaction in viewing choice and what part customization plays in that satisfaction through an experimental-survey design. Drawing from choice literature which points in …

A Systematic Content Analysis Of The Justice Reinvestment Programs Across Oregon Counties, Lorena Ambriz

Dissertations and Theses

High levels of imprisonment and its associated costs have pressured criminologist and policymakers to create and establish new policies intended to reduce incarceration spending and lower the number of individuals under correctional facilities. Justice Reinvestment Initiatives (JRI) have been developed with the basic idea of redirecting the $54 billion annual incarceration spending toward rebuilding human resources and physical infrastructure of high-risk communities. These initiatives should create local programs that promote successful reentry, reduce recidivism, decrease prison usage, and improve public safety. Oregon passed the Justice Reinvestment Act in 2013, which allowed for all 36 Oregon counties to implement JRI programs …

Understanding Fare Evasion Defendant Compliance: An Assessment Of Criminal Records, Nataly Nunez Vasquez

Dissertations and Theses

The present study sought to examine the factors that most distinguish fare evaders who do not pay their fines and fail to appear in court from fare evaders who pay their fines and appear in court. The relationship between prior criminal history and fare evasion offenders who do not pay their fines and fail to appear in court is also explored. A sample of 24,646 defendants who received a citation for fare evasion while riding the Tri-Met transit system in Portland, Oregon were divided into two groups of fare evaders who pay and appear in court and fare evaders who …

Working From Home: Analyzing The Autonomy Of App-Based Adult Content Creators, Jenna Depasquale

Dissertations and Theses

Accessibility to social media applications ("apps") has paved the way for a new addition under the umbrella of sex work: adult content creation. By selling self-produced photos and videos through mainstream social media apps, creators experience a specific set of conditions unlike the forms of sex work that have proceeded it. Through 13 semi-structured interviews, the following question is investigated: What aspects of app-based sex work heighten or threaten workers' senses of autonomy? Autonomy is defined as being able to exert control over one's work and the ability to work without external interruption. It is found that while the demand …

Juveniles In The Interrogation Room: Defense Attorneys As A Protective Factor, Caitlin Noelle August

Dissertations and Theses

Juveniles have a lower comprehension of their Miranda rights than adults, and in turn, are more likely to waive those rights and cooperate during an interrogation. Some states require youths to consult with their parents before/during the interrogation; however, this involvement can be detrimental to the juvenile suspect. Recently, laws in California and Illinois have mandated that juveniles consult with a defense attorney prior to the interrogation, or that the attorney is present during the interrogation.

Through semi-structured interviews with 19 juvenile defense attorneys across the state of Oregon, I explored defense attorneys' perspectives on juveniles' legal decision-making in the …

Sensing Malignancy: Expanding Upon The Nematode Scent Detection Test, Morgan Alexandra Thompson

Dissertations and Theses

With the growing prevalence of cancer worldwide, research has increasingly focused on methods of early detection since the early detection of cancer can dramatically improve health outcomes for affected individuals. Ideally, early detection systems would be highly reliable yet cost-effective and easy to use. Toward development of such a system, Hirotsu et al. (2015), developed a "Nematode Scent Detection Test" (NSDT) that capitalizes upon the attraction of Caenorhabditis elegans nematodes to various tissue samples from cancer patients to detect multiple types and stages of cancer. However, it is currently unknown which G-protein coupled receptors (GPCRs), and/or ligands interacting with theses …

Morphology, Taxonomy, And Ecological Niche Modeling Of The Cochabamba Grass Mouse, Akodon Siberiae Myers & Patton, 1989, James George Dunn

Dissertations and Theses

The Cochabamba Grass Mouse, Akodon siberiae, is a small mouse (mean head+body length: 103 mm, N = 22) that occurs in a spatially restricted range in the Bolivian Yungas forests, the cloud forest transition zone between lowland Amazonia and the Andean Altiplano. Like many species in the genus, their appearance is very similar to that of other species in the genus: they are difficult to distinguish from their congeners, and are challenging to identify. In the absence of molecular data, A. siberiae specimens require a thorough and careful analysis of external and cranial features for identification. Furthermore, Akodon …

Understanding Institutional, Social, And Ecological Systems Influencing Climate Change Adaptation And Water Governance In Wine Regions: A Comparative Case Study Of Oregon's Willamette Valley, Usa And Tasmania, Australia, Erin Upton

Dissertations and Theses

My research examines how water management decisions create opportunities or barriers to climate change adaptation in wine regions. Water is a critical resource for economic and environmental sustainability in wine grape growing regions. Climate uncertainty presents considerable risk and vulnerability to freshwater resources in wine producing regions where needs for access to water will increase with more frequent climate extremes. Climate adaptation in the wine industry is a complex problem that requires multi-disciplinary approaches. This research aims to strengthen the interface between water governance and technological and viticulture adaptation approaches. Water resources are shared across regions by stakeholders with varied …

Exploring The Factors Influencing Big Data Technology Acceptance, Mohammad Nayemur Rahman

Dissertations and Theses

The success of new technology depends on user acceptance. Therefore, discovering the antecedents of technology use is pivotal to overcoming the lack of user acceptance in the field of technology adoption. Factors of critical technological capability, in particular, are overlooked and largely neglected in the literature. Accordingly, the body of literature on the field of technology adoption is inconclusive as to which technological capability factors influence technology acceptance.

Big Data has received great attention in academic literature and industry papers. Most of the experiments and studies focused on publishing results of big data technologies development, machine learning algorithms, and data …