Digital Commons Network^™

Genetic Patterns Of Dispersal And Colonization During Initial Invasion And Spread Of An Invasive Grass, Brachypodium Sylvaticum, Alisa Paulsen Ramakrishnan

Dissertations and Theses

Evolution of genotypes during range expansion is driven in part by colonization dynamics. I investigated genetic patterns of colonization and dispersal during initial expansion of an invasive bunchgrass, Brachypodium sylvaticum, into Oregon. Using microsatellite markers, I sampled plants at two different scales: at regular intervals along three parallel roads spanning about 30km, and in populations identified throughout Oregon. I also collected field-generated progeny from a subset of populations and used molecular identification of outcrossing events to estimate selfing rates in both central and peripheral populations. Dispersal patterns were similar at both scales, with non-contiguous dispersal responsible for colonization of new …

Achieving Congruence: Building A Case For Implementing A District-Wide Interim Benchmark Assessment That Is Aligned With A Balanced Literacy Framework, Theodore Feller

Dissertations and Theses

For generations--and certainly for the last 30 years--proponents of traditional and progressive philosophies have argued over how best to educate our children. Although this debate is often carried out in the political and academic spheres, the difficulties created by not being able to resolve the differences between the two belief systems become blatantly clear in the pedagogy of early literacy. On the one hand, traditionalists argue for a direct and explicit instructional methodology, and on the other hand, progressives advocate for Whole Language or Balanced Literacy instruction. The classroom often becomes a battlefield as advocates of these opposing schooling paradigms …

Comparison Of Microshear Bond Strength And Morphological Changes Between Active And Passive Application Of 4th Generation Etch-And-Rinse Etchant On Enamel, Sophia Tuyet-Nhi Trieu

Dissertations and Theses

Over 200 million dental restorations are performed each year in America. A dental restoration require a strong bonding of restoration to tooth structure and relies on the dental adhesive to create this mechanical and chemical bonding. Dental adhesion or bonding is the process of forming an adhesive joint between the composite and tooth substrate: dentin or enamel. Clinical problems such as microleakage at the restoration tooth interface, influx of fluids, or bacteria growth at the cavity wall can be prevented with adhesives that obtain a more intimate bonding. Longevity of the restoration can be enhanced by the adhesive that creates …

A Comparison Of Single Word Identification, Connected Speech Samples, And Imitated Sentence Tasks For Assessment Of Children With A Ssd, Emily Katherine Snyder

Dissertations and Theses

Speech-language pathologists are constantly trying to use the most efficient and effective assessments to obtain information about the phonetic inventory, speech sound errors, and phonological error patterns of children who are suspected of having a speech sound disorder. These assessments may involve a standardized measure of single words and/or sentences and a non standardized measure, such as a spontaneous speech sample. While research has shown both of these types of assessments to give clinicians information about a child's speech production abilities, the use of delayed imitation tasks, either words or sentences, has not been a widely studied topic and has …

Characterization Of Novel Functions And Topologies In Rna, Aaron Steven Burton

Dissertations and Theses

The RNA World hypothesis describes a period of time during the origins of life in which RNA molecules performed all catalysis and were the only form of information storage. A great deal of evidence has been obtained in support of this hypothesis, however a few key demonstrations are lacking. The first demonstration is of a molecule capable of self-replication that could have plausibly arisen from the prebiotic soup. Previously in the Lehman Laboratory, a 198-nucleotide RNA was discovered that could be fragmented into as many as four pieces ranging from 39 - 63 nucleotides in length. When these pieces were …

Cyclic Behavior Of Screen Grid Insulated Concrete Form Components, Carl Scott Werner

Dissertations and Theses

The principle of sustainability in the built environment has become much more significant in the past decade, resulting in a push to develop building systems that are more energy efficient, durable, and use fewer natural resources. For residential and light commercial buildings, insulated concrete forms (ICF) have enjoyed increasing popularity for their ability to meet these new demands. ICFs are a stay-in-place concrete formwork system for building structural walls that are also highly insulated, among other benefits. Screen-grid ICFs (SGICF) are a small subset of ICFs that tend to use less concrete than standard ICFs and are sometimes made of …

Child Welfare Workforce Turnover: Frontline Workers' Experiences With Organizational Culture And Climate, And Implications For Organizational Practice, Melanie Dawn Sage

Dissertations and Theses

Public child welfare agencies experience front line worker turnover rates as high as 25% a year. Worker turnover has significant financial costs to agencies, and has been linked to negative outcomes for children in care. Prior research has linked organizational factors, such as organizational climate, culture, and supervisor satisfaction, to turnover intent in child welfare populations. This research uses an empowerment framework to turn to workers directly to answer the question, "What are the organizational factors that lead frontline child welfare workers to stay or leave the agency, and what, then, are the implications for agency administrators?" This study relies …

Synthesis Of Reversible Functions Using Various Gate Libraries And Design Specifications, Nouraddin Alhagi

Dissertations and Theses

This dissertation is devoted to efficient automated logic synthesis of reversible circuits using various gate types and initial specifications. These Reversible circuits are of interest to several modern technologies, including Nanotechnology, Quantum computing, Quantum Dot Cellular Automata, Optical computing and low power adiabatic CMOS, but so far the most important practical application of reversible circuits is in quantum computing. Logic synthesis methodologies for reversible circuits are very different than those for classical CMOS or other technologies. The focus of this dissertation is on synthesis of reversible (permutative) binary circuits. It is not related to general unitary circuits that are used …

The Design Of A Novel Tip Enhanced Near-Field Scanning Probe Microscope For Ultra-High Resolution Optical Imaging, Derek Brant Nowak

Dissertations and Theses

Traditional light microscopy suffers from the diffraction limit, which limits the spatial resolution to λ/2. The current trend in optical microscopy is the development of techniques to bypass the diffraction limit. Resolutions below 40 nm will make it possible to probe biological systems by imaging the interactions between single molecules and cell membranes. These resolutions will allow for the development of improved drug delivery mechanisms by increasing our understanding of how chemical communication within a cell occurs. The materials sciences would also benefit from these high resolutions. Nanomaterials can be analyzed with Raman spectroscopy for molecular and atomic bond information, …

Modeling Terahertz Diffuse Scattering From Granular Media Using Radiative Transfer Theory, Kyung Moon Nam

Dissertations and Theses

Terahertz (THz) spectroscopy can potentially be used to probe and characterize inhomogeneous materials, however spectroscopic identification of such materials from spectral features of diffuse returns is a relatively underdeveloped area of study. In this thesis, diffuse THz scattering from granular media is modeled by applying radiative transfer (RT) theory for the first time in THz sensing. Both classical RT theory and dense media radiative transfer (DMRT) theory based on the quasi-crystalline approximation (QCA) are used to calculate diffuse scattered intensity. The numerical solutions of the vector radiative transfer equations (VRTE) were coded and calculated in MATLAB. The diffuse scattered field …

Anatomy Of Mishima's Most Successful Play Rokumeikan, Mami Harano

Dissertations and Theses

Mishima Yukio premiered the play Rokumeikan in 1956 and published it in 1957. For more than half a century, this play has been praised as one of the finest Japanese plays in the Post-War period. Rokumeikan is a multi-act tragic melodrama, set in 1886 (Meiji Period) in the Rokumeikan building. The play intertwines complex political cabals, intense loves and hatreds, and multiple deceptions embodying the conflict between political power and love. This essay explores the reasons why Rokumeikan has maintained its popularity over its fifty year long performance history and examines the critical reception of the play. My analysis of …

Between Non-Intervention And Protection: A Study On The Case Of Darfur And The Responsibility To Protect, David Ryan Lucas

Dissertations and Theses

This thesis explores the obstacles in establishing a consistent and effective response framework for humanitarian catastrophe and the importance of maintaining a sustained dialogue to this end. It does so by recognizing the underlying conflict between two positions: the norm of non-intervention of states into the affairs of others, and the protection of individuals caught in the middle of violent conflict. The importance of working towards a resolution of this conflict is illustrated through the case study of Darfur, where a divided international community led an insufficient response to the crisis that can ultimately be judged as a failure. Lastly, …

Transformative Teacher Evaluation: Self Evaluation For High Performing Teachers, Carla Ann Sosanya-Tellez

Dissertations and Theses

Public schools are in crisis, as educators and legislators seek to provide high quality education to diverse students in a measurement-driven environment. The public educator's moral imperative is to assure that all children are literate when they leave school so they can thrive in our democracy (Dewey, 1944; Freire, 1998a; Giroux & Giroux, 2004). Yet, the achievement gap persists, as poor African-American and Latino students under-perform as compared to white middle-class students (Ladson-Billings & Tate, 1995). Additionally, public school teachers are predominately middle-class and White, while they teach increasingly diverse children of poverty. In legislation, student assessment, teacher licensure, and …

Symmetric Near-Field Probe Design And Comparison To Asymmetric Probes, Jeffrey Jon Doughty

Dissertations and Theses

Tip Enhanced Near-field Optical Microscopy (TENOM) is a method for optically imaging at resolutions far below the diffraction limit. This technique requires optical nano-probes with very specialized geometries, in order to obtain large, localized enhancements of the electromagnetic field, which is the driver behind this imaging method. Traditional methods for the fabrication of these nano-probes involve electrochemical etching and subsequent FIB milling. However, this milling process is non-trivial, requiring multiple cuts on each probe. This requires multiple rotations of the probe within the FIB system, which may not be possible in all systems, meaning the sample must be removed from …

Stochastic Orders In Heterogeneous Samples With Applications, Maochao Xu

Dissertations and Theses

The statistics literature has mostly focused on the case when the data available is in the form of a random sample. In many cases, the observations are not identically distributed. Such samples are called heterogeneous samples. The study of heterogeneous samples is of great interest in many areas, such as statistics, econometrics, reliability engineering, operation research and risk analysis.

Stochastic orders between probability distributions is a widely studied concept. There are several kinds of stochastic orders that are used to compare different aspects of probability distributions like location, variability, skewness, dependence, etc.

In this dissertation, most of the work is …

War, Peace, And Principled Action: A Study Of Veterans And The Peace Movement, Laura Kay Wegener

Dissertations and Theses

Throughout the history of the United States (U.S.), there have been service members who, upon leaving the service, have spoken out against U.S. involvement in wars. The current conflicts in Afghanistan and Iraq, and their increasing unpopularity, have contributed to this trend. Recently veterans have begun to come forward in larger numbers to speak out against the current wars and have self-identified as members of peace movements. The purpose of this research project was to explore veterans' understandings of the peace movement and their involvement in veterans' peace movement organizations. This study hoped to answer the following questions: 1) How …

A Wind River Romance, Megan Breen Leigh

Dissertations and Theses

A first-person narrative adult novel explores the theme of abandonment with its residual and enduring effects, and its antithetical theme of loyalty that is continually tested and measured. The protagonist, editor of the local newspaper in a small, isolated agricultural community in the mid-1960s, provides the narrative nexus of two families. His is a community which is a mix of characters that are quirky by virtue of their natures or the remote circumstances of their existence. Both families in focus have treasure troves of secrets. Only after the appearance of a mysterious young woman and her subsequent murder do the …

Nihilism Unbound: Strauss, Nietzsche And Foucault As Nihilist Thinkers, Jeffrey Jacob Wade

Dissertations and Theses

Many of the writings of Leo Strauss were dedicated to combating the "crisis of modernity". This crisis was for him the advent and acceptance of nihilism--a state of being wherein any principle one dare dream is allowed and judgment must be withheld. He claimed that the promotion of nihilism at the hands of modern social scientists would lead to the downfall of civilization. Yet, this work seeks to show that all of these claims are made by Strauss in an attempt to hide the "truth" of nihilism from the masses and that Strauss, in fact, is a nihilist thinker. The …

A Structural And Functional Analysis Of Codeswitching In Mi Vida Gitana 'My Gypsy Life,' A Bilingual Play, Gustavo Javier Fernandez

Dissertations and Theses

The present study analyzed the language in the script of the bilingual play Mi Vida Gitana 'My Gypsy Life' (Malán, 2006) in order to better understand issues relating to codeswitching (CS). The analysis was done from a structural and a functional perspective and utilized various models developed by renowned CS scholars.

For the structural analysis, I utilized concepts and ideas put forth in the three-tiered typology created by Muysken (2000) and the Matrix Language Frame model developed by Myers-Scotton (1993). The results of this portion of the study showed that some form of CS, whether occurring between turns or within …

Limitation Riders In The Postreform House: A Test Of Procedural Cartel And Conditional Party Government Theories, Jessica Scott Tollestrup

Dissertations and Theses

The theoretical debate over the ability of parties and leaders in the House of Representatives to influence legislative decision-making is at the center of much of the literature on Congress. On the one hand, the Procedural Cartel perspective argues that while the tools used by the majority party leadership to assure the triumph of its preferences may vary depending on the institutional context, the basic ability of the leadership to impact legislative outcomes remains consistent. In contrast, Conditional Party Government (CPG) theory posits that any power the majority party and its leadership possesses over legislative decision-making is directly conditioned upon …

Exploratory Eddy Covariance Measurements Of Surface Heat And Co2 Fluxes In The Roughness Sublayer Of An Urban Environment, Benjamin F. Burnett

Dissertations and Theses

In this study eddy covariance was used to measure sensible heat, latent heat, and carbon dioxide fluxes for the months of August, September, and October of 2009 within the roughness sublayer (RSL) of the urban center of Portland, OR. Vehicle traffic and solar radiation were also measured for the month of October. Flux measurements were compared with measurements from other urban areas as a test of reasonableness. CO₂ fluxes were nearly always positive and were strongly correlated with the weekday diurnal traffic cycle. CO₂ fluxes averaged 6.6 μmol/m^²s, which is less than other published measurements in urban areas. Sensible and …

Globalization; But Under What Conditions? -- The Case Of The E.U., Michaelangelo Anastasiou

Dissertations and Theses

The present study explores the relationship between trust placed in national institutions and opinion of globalization. A secondary data analysis is conducted using data collected by the European Commission in a 2004 Eurobarometer survey of European Union (EU) citizens on various issues regarding the EU, globalization and national challenges. A prominent theme in the literature is that, in recent times, globalization has had the effect of compromising the sovereignty of nation-states. This has generated a backlash of nationalistic attitudes wherein globalization is posited in opposition to the nation-state. This surge in nationalism has reinforced a culture wherein any external force …

Investigation Of Speech Samples From Typically Developing Preschool Age Children: A Comparison Of Single Words And Imitated Sentences Elicited With The Paba-E, Matthew William Olsen

Dissertations and Theses

Assessment of speech sound production in young children provides the basis for diagnosis and treatment of speech sound disorders. Standardized single-word articulation tests are typically used for identification of speech sound errors because they can provide an efficient means of obtaining a speech sample for analysis and comparison to same-age peers. A major criticism of single-word articulation tests is that they may not accurately reflect speech sound production abilities in conversation. Comparison of performance in single-word and conversational contexts has produced conflicting results in the available research.

The purpose of the present study was to compare speech samples obtained using …

Thin Film Group Ii-Vi Solar Cells Based On Band-Offsets, James Keith Walton

Dissertations and Theses

The amount of traditional energy sources are finite and the ecological impact of continuing to produce energy using fossil fuels will only exacerbate the carbon footprint. It is for these reasons that photovoltaic modules are becoming a larger and more necessary part the world's electricity production paradigm.

Photovoltaic (PV) semiconductor modules are grouped into three categories. 'First generation' monocrystalline and polycrystalline silicon modules that consist of p-n junctions created via the addition of impurities known as dopants. Almost 85% of solar cells produced at this time are 'first generation' and it is the high production costs of silicon PV modules …

Teacher Evaluation Of Item Formats For An English Language Proficiency Assessment, Jose Luis Perea-Hernandez

Dissertations and Theses

An abstract of the thesis of José Luis Perea-Hernández for the Master of Arts in Teaching English to Speakers of Other Languages presented February 11, 2010. Title: Teacher Evaluation of Item Formats for an English Language Proficiency Assessment. Language testing plays a significant role in the collection of systematic information about English Language Learners' ability and progress in K-12 public schools in Oregon. Therefore, the following thesis reports on a process of the development of this assessment as I was at some point one of the members in the test development team and then drew upon teachers' opinions and judgments …

Music And Conflict Resolution: Exploring The Utilization Of Music In Community Engagement, Mindy Kay Johnston

Dissertations and Theses

This study is based on interviews conducted with twenty-two musician-activists in the Pacific Northwest region of the United States in 2009 to explore perspectives about the role of music in community engagement with the aim of considering how music might be used in the field of conflict resolution. The study followed the qualitative approach of constructivist grounded theory as designed by Charmaz (2000, 2002). Two themes, "Music for Self," and "Music for Society" emerged from interviews and comprise the internal and external meanings of music to the research informants. The results of the study indicate that the relationships people have …

A Logic Formulation For The Qca Cell Arrangement Problem, Marc Stewart Orr

Dissertations and Theses

Some people believe that IC densities are approaching the fundamental limits inherent to semiconductor technologies. One alternative to semiconductors is Quantum-dot Cellular Automata (QCA); QCA is a nanotechnology that offers the potential to build denser IC's that switch at higher frequencies and run on lower power. QCA's most basic building block, the QCA cell, is inherently binary; digital circuits are implemented by arranging these QCA cells in pre-defined configurations on a two dimensional plane. This paper proposes a logic formulation that describes arranging QCA cells on a two dimensional plane; it is presented as a set of rules that can …

Rashomon Comes To The Courtroom: The Adoption Of The Lay Judge System In Japan, Its Impact On Jurisprudence, And The Implications For Civic Engagement, Bryan Matthew Thompson

Dissertations and Theses

In May of 2009, Japan began formal operations of the "saiban-in seido" or "lay judge system," a quasi-jury means of criminal trial adjudication that represents the first occasion since 1943 that average Japanese citizens will be required to fulfill a role in the criminal jurisprudential process. While the lay judge system promises to affect the methods and procedures of criminal trials in Japan, recent scholarship in the United States has raised an interesting question: to what degree can the lay participatory adjudication process facilitate greater levels of civic engagement in past citizen jurists once their service has completed?

It …

Exploring School Engagement As A Protective Factor For Youth At Risk Of Joining Gangs, Lorraine M. Escribano

Dissertations and Theses

Research on gangs has traditionally focused on identifying the risk factors associated with youth gang membership in multiple developmental domains with limited attention on examining the protective factors that may buffer youth from joining gangs (Howell & Egley, 2005). Educational and psychological research have found robust evidence that school engagement protects youth from a host of risky activities and negative outcomes (e.g., substance use, dropping out of school) and may hold promise in also protecting youth from gang involvement. Therefore, the purpose of the present study is three-fold: (1) to identify students who are at risk for gangs; (2) to …

La Palabra Es Salud: A Comparative Study Of The Effectiveness Of Popular Education Vs. Traditional Education For Enhancing Health Knowledge And Skills And Increasing Empowerment Among Parish-Based Community Health Workers (Chws), Noelle Wiggins

Dissertations and Theses

Popular education is a mode of teaching and learning which seeks to bring about more equitable social conditions by creating settings in which people can identify and solve their own problems. While the public health literature offers evidence to suggest that popular education is an effective strategy for increasing empowerment and improving health, there have been no systematic attempts to compare the outcomes of popular education to those of traditional education. The goal of La Palabra es Salud was to conduct such a comparison among Latino, parish-based Community Health Workers (CHWs). The study employed a quasi-experimental design, mixed methods, and …