Digital Commons Network^™

Like-Doublet Injectors : The Effects Of Varying The Impingement Distance And An Analysis Of The Primary Atomization Zone, Brian A. Sweeney

Dissertations

This research explored how the jet breakup length to impingement distance ratio affects the spray characteristics of like-doublet injectors and consisted of cold-flow experiments using water at atmospheric pressure. A combination of three impingement angles, four jet velocities, and four jet breakup length to impingement distance ratios between one-half and two were tested. The breakup characteristics, sheet lengths and ligament wavelengths were determined from high-speed videos of the spray while droplet statistics were collected with a Phase Doppler Particle Analyzer. The sheet breakup characteristics were altered when the ratio transitioned from greater than one to equal to one and dramatically …

Robust Support Media For High Throughput Chromatographic Separations, Javier Sanchez Santiago

Dissertations

Affinity chromatography is used to separate biomolecules based on highly specific interactions, such as receptor and ligand, enzyme and substrate or antigen and antibody. Traditional chromatographic separation systems have the disadvantages of low flowrates, high pressure drop across the column, low capacity and poor reusability. Ceramic monoliths have been previously used as active support for affinity chromatographic columns due to their compact geometry and outstanding mechanical properties. In addition, mathematical models have been developed in order to determine the adsorption and elution times depending on the monolith geometry. The reversible interaction between L-asparagine and L-asparaginase has been exploited, using a …

Pickup Ion Production In The Global Heliosphere And Heliosheath, Yihong Wu

Dissertations

Pickup ions (PUIs) play a significant part in mediating the solar wind (SW) interaction with the interstellar medium. In this dissertation, I examine the details of spatial variation of the PUI velocity distribution function (VDF) in the SW by solving the PUI transport equation. I assume the PUI distribution is isotropic resulting from strong pitch-angle scattering by wave-particle interation. I take into account the effects of convection with the SW, adiabatic cooling, second-order Fermi process and production of PUIs. I analyze how PUIs transform across the heliospheric termination shock (TS) and obtain the PUI phase space distribution in the inner …

Transformative Models In K-12 Education: The Impact Of A Blended Universal Design For Learning Intervention, Kai Monet Mathews

Dissertations

Accountability measures, by way of standardized curriculum and assessments, have played a large part in the attempt to ensure that students from all backgrounds receive equal access to quality education. However, the inherent disadvantage of a standardized system is the implied assumption that all students come in with the same knowledge, learn at the same pace, and learn the same way. In the wake of an increasingly diverse K-12 population, educational researchers, learning theorists, and practitioners agree that the concept of the average student is, in fact, a myth. Students come to school with different needs, norms, interests, cultural behavior, …

Exploring The Intersection Of Fat+Wom*N+Leadership: An Action Research Study, Jessica Jamese Williams

Dissertations

Cultural propaganda promotes an ever-changing feminine ideal which is parasitically reliant on women preoccupying themselves—ourselves—with our physical aesthetic. For women that identify as fat, most spaces openly neglect or are simply intolerant of her and even the stores meant for her are riddled with products meant to bind, reshape and essentially change her body. Fat women embody the paradox of being both conspicuous and unseen. Within systems, fat women are often silenced by shame, bias and discrimination; the unwanted and soiled identity hold us at the margins and serving as a barrier to effectively connect with others and practice leadership. …

Parental Involvement, Socio-Economic Status And Students' Perceptions Of The Classroom Learning Environmnet As Predictors Of 8th Grade Students Academic Achievement: A Structural Equation Model, Allyson Blandin

Dissertations

Problem

Academic achievement among the nation’s youth has been on the decline for decades. The statistics from the National Assessment of Educational Progress (NAEP) paints a bleak picture of the academic performance of more than half of the 4th and 8th grade students being below the required levels of proficiency in reading and mathematics. This is evidence that a problem of low academic achievement exists among certain student groups within the public education system. Therefore, it creates an academic achievement gap, which is reflected in the disparity in the standardized scores between students of color from low socio-economic status with …

Using Tops For Identification Of Gifted Hispanic Students, Barbara Martin

Dissertations

USING TOPS FOR IDENTIFICATION OF GIFTED HISPANIC STUDENTS

Researchers have noted an underrepresentation of Hispanic ELL students in gifted education. A literature review revealed several problems encountered when assessing and identifying gifted Hispanics and have also suggested a variety of solutions including use of non-standardized alternative assessments. In this project, the researcher explored the attitudes of educators regarding the addition of a non-standardized tool. The TOPS is a non-standardized tool used to systematically gather and document qualitative observational data within the context of instruction (Harradine, Coleman, & Winn, 2014). The researcher used both a survey questionnaire and a semi-structured interview …

How Can Parent-Child Interactions In A Museum Support Children’S Learning And Transfer Of Knowledge, Maria Marcus

Dissertations

This study investigated ways to support young children’s STEM learning and ability to generalize their knowledge across informal learning experiences. Participants were 128 parents and their 4- to 8-year-old children (Mage = 6.63, SD = 1.38). Families were randomly assigned to receive engineering instructions, transfer instructions, both engineering and transfer instructions, or neither. They were then observed working together to solve an engineering problem, and immediately afterward, the children were invited to solve a second engineering problem on their own. Families who received engineering instructions – either alone or in combination with the transfer instructions - were more successful at …

Design And Analysis Of Biased Run-Length Coding Methods And Their Applications In Lossless Compression Of Bi-Level Roi Maps In Hyperspectral Images, Amir Leon Liaghati

Dissertations

This work addresses efficient lossless compression of binary images. To this end, we designed several novel compression techniques, including one method known as the biased run-Length coding method. In this method, we first partition a binary image into equally sized blocks. We then convert the binary pixels within each block into a block symbol. In contrast to conventional approaches where all symbols are run-length coded, our method run-length codes only the most probable block symbols, followed by Huffman coding on the run-lengths. The other less probable block symbols will be coded with a separate Huffman code. Tests on NASA's AVIRIS …

Material Sections And Natural Fragmentation Size Distributions In Heterogenous Shells, Justin Christopher Sweitzer

Dissertations

The dynamic fragmentation of shell cases has historically been treated with mixed physical and statistical models that have been applied with varying degrees of success. Mott developed the most commonly used physics-based model of fragmentation in the 1930’s. Mott also developed an unrelated, but more pervasive statistical distribution function. In this work, basic concepts of these analyses are extended to account for fracture energy and applied to the explosive fragmentation of shell elements and to the impact fragmentation of solid plates. An energy-based distribution function is developed and validated against experiment, and conclusions are drawn regarding the efficacy of the …

The Relationship Between Leaders' Emotional Intelligence And Employees' Organizational Citizenship Behavior And Job-Related Affective Well-Being At Andrews University, Robert L. Overstreet

Dissertations

Problem

Research has been conducted linking high levels of Emotional Intelligence (EI) in leaders with organizational success. However, the link between leaders’ EI levels and workplace climate (as evidenced by employees’ Job-related Affective Well-being [JAW] and Organizational Citizenship Behavior [OCB] levels) has not been adequately understood. This study sought to improve the understanding of how employee affective well-being and citizenship behaviors are related to leaders’ EI, with additional consideration given to how the gender of those leaders may affect that relationship.

Method

A quantitative correlational research method has been chosen as an appropriate method for the research study in which …

Atomic Oxygen Adsorption And Absorption On Rh(111) And Ag(111), Jonathan Derouin

Dissertations

A central question in the field of heterogeneous catalysis is how surface structure and subsurface species influence catalytic behavior. One key to answering that question is determining which surface structures and subsurface species are present under catalytically relevant conditions. This dissertation presents results of Auger electron spectroscopy, low energy electron diffraction, temperature programmed desorption, and scanning tunneling microscopy experiments on oxidized Rh(111) and Ag(111) crystals. Exposing Rh(111) to O2 produced a predominately (2 × 1) adlayer, but even after extended dosing, (2 × 2) domains were also present. Exposing Rh(111) to atomic oxygen yielded O coverages greater than 0.5 ML …

Emature: Intergenerational Networks In Digital Media Spaces, Andras Lukacs

Dissertations

While the literature on adolescent usage of the Internet and mobile communication technology is burgeoning, the technological affordance of increased intergenerational contacts and intergenerational friendships received less attention. This project documents how intergenerational virtual networks operate in one particular massively multiplayer online game (World of Warcraft) from the standpoint of adolescent players. Online social worlds are similar to offline settings in a lot of ways. Users must obey certain behavioral standards and follow established rules and moral codes to participate. Despite accounts of online democracy and networked individualism, control and authority is central to the functioning of these environments. Power-relationships …

Performance Of Individuals And Teams On Cryptographic Tasks: Factors That Affect The Consideration Of Alternative Strategies, Joseph Bihary

Dissertations

The two studies presented here examined factors that might affect teams’ and individuals’ tendency to follow outside advice when attempting to solve a complex problem known as letters-to-numbers. Past research on group dynamics suggests that a lack of group consensus or homogeneity reduces group members’ confidence in their group’s abilities, and may lead members both to seek and accept advice from outside the group. Study 1 experimentally manipulated group diversity in task performance strategies in order to investigate whether dyads whose members have divergent perspectives are more likely than homogeneous dyads to consider and use a problem-solving strategy presented from …

Dreamers And The College Dream: A Case Study Analysis Examining The Influences Of High Schools And High School Agents, Aliza Joy Gilbert

Dissertations

This dissertation study contributes to a nascent field of research on undocumented students and college access. Rooted in a conceptual framework of models of college choice, this study utilizes case study methodology to examine how a high school and its agents influence an undocumented student’s college choice process. The unit of analysis is a suburban public high school located in the Midwest.

Data collection included semi-structured interviews of students, teachers, counselors, and college counselors, observation of college counseling programs, and document review of college related materials. The constant comparative method was the primary system of data analysis. The coding process …

Development Of Folate Directed, Protein Based Photodynamic Therapy Agents, Rojenia Jones

Dissertations

To attack cancer cells in a specific manner, we have developed a folate-targeted, photodynamic therapy (PDT) agent. The folate (FA) and the chlorin e6 (Ce6) photosensitizer were attached to bovine serum albumin (BSA) using carbodiimide chemistry. Since over 50% of cancers overexpress folate receptors, FA-BSA-Ce6 can be taken up by them and is an effective PDT agent. Hela cells exposed to FA-BSA-Ce6 in the dark showed no cytotoxicity. Upon exposure to light, the conjugate was dose (time and concentration) dependent. Concentrations less than or equal to 2 µM were not effective at killing Hela cells but concentrations of at 5 …

Quality Of Math Instruction Matters: Examining Validity And Reliability Of High Impact Strategies In Early Mathematics (His-Em), Bilge Cerezci

Dissertations

The purpose of this study is to introduce a measure of early mathematics teaching practices, the High Impact Strategies in Early Mathematics (HIS-EM) and its framework, and to examine its criterion-related, predictive validity of High Impact Strategies in Early Mathematics (HIS-EM) and describe the types of early math teaching the HIS-EM detects among a sample of Pre-kindergarten to 3rd grade teachers working with high need students in an urban public schools system. The findings indicate that the HIS-EM produced reliable scores, and meaningful and predictable associations were found between HIS-EM and CLASS. The results also suggested that high quality mathematics …

Exploring Conditions For The Enhancement Of Acene Semiconductors Through The Use Of The Diels-Alder Reaction, Brittni Qualizza Qualizza

Dissertations

This dissertation demonstrates the application of SAMs to the surface of acene crystals, specifically of tetracene and rubrene, using the Diels-Alder reaction. The second chapter details preliminary reaction results and two analytical methods which were employed to confirm adsorption of the dienophile on the surface of single crystals, tetracene and rubrene. These were mass spectrometry and X-ray photoelectron spectroscopy (XPS). Mass spectrometry experiments distinguish the chemical identity of adduct on the crystals and also it discerned chemi- and physisorbed molecules from one another. XPS was used to prove face selectivity of the reaction by the detection of dichloromaleic anhydride. From …

The Utilization Of Liquid Chromatography Tandem Mass Spectrometry And Related Techniques For The Analysis And Identification Of Emerging Contaminants In Aqueous Matrices, Matthew Reichert

Dissertations

Environmental pollutants can be found in many ecosystems and cover many different compound classes. The Environmental Protection Agency is responsible for monitoring and regulating several of these classes of compounds which daily enter the environment. However, there are still hundreds, if not thousands, of compounds present in the environment which have yet to be regulated or even identified. The discovery and identification of these unknown emerging pollutants is crucial for the prevention of potential human health risks and irreversible ecological damage.

The research presented is divided into two projects. The first part of this research investigates the disinfectant 3-Bromo-1-chloro-5,5-dimethylhydantoin, which …

Missing Data In The Context Of Student Growth, Katherine Wright

Dissertations

One property of student growth data that is often overlooked despite widespread prevalence is incomplete or missing observations. As students migrate in and out of school districts, opt out of standardized testing, or are absent on test days, there are many reasons student records are fractured. Missing data in growth models can bias model estimates and growth inferences. This study presents empirical explorations of how well missing data methodologies recover attributes of would-be complete student data used for teacher evaluation. Missing data methods are compared in the context of a Student Growth Percentiles (SGP) model used by several school systems …

Habermas And Public Reason In The Digital Age: Technology And Deliberative Democracy, Asaf Bar-Tura

Dissertations

Scholars defending the deliberative model of democracy have focused much of their attention on argumentation and criteria for offering public reasons in deliberative processes, but have paid little attention to the ways in which digital technologies mediate such deliberations. Conversely, critical theorists of technology have emphasized the socially determined nature of technology, but have lacked a theory of democracy through which to normatively assess technologies that mediate public discourse. Through a reworking of Jürgen Habermas’s discourse-based theory of democracy, my research provides a new understanding of the flows of political communication and power in the democratic public sphere and the …

Evolutionary Dynamics Of Speciation And Extinction, Dawn Michelle King

Dissertations

Presented here is an interdisciplinary study that draws connections between the fields of physics, mathematics, and evolutionary biology. Importantly, as we move through the Anthropocene Epoch, where human-driven climate change threatens biodiversity, understanding how an evolving population responds to extinction stress could be key to saving endangered ecosystems. With a neutral, agent-based model that incorporates the main principles of Darwinian evolution, such as heritability, variability, and competition, the dynamics of speciation and extinction is investigated. The simulated organisms evolve according to the reaction-diffusion rules of the 2D directed percolation universality class. Offspring are generated according to one of three reproduction …

Transformational Learning: An Investigation Of The Emotional Maturation Advancement In Learners Aged 50 And Older, Susan Lorraine Lundry

Dissertations

Human beings have spent much time and effort in trying to understand themselves, others, and their world. Mankind uses intellect when trying to understand life but the majority of people continue to encounter frustration, confusion, and a variety of obstacles when dealing with daily challenges and people. Theorists and researchers understand that successful existence requires more than mere knowledge; it requires a level of understanding, a form of wisdom foreign to the bulk of the populace. The missing ingredient for this kind of wisdom is the ability to ‘know thyself,’ which is the beginning of establishing a higher level of …

A Delphi Study Of An Effective State Assessment Method For Continuation High Schools, Edison L. Kelly

Dissertations

Since the No Child Left Behind Act of 2001, there has been an urgency in the overall academic accountability for all students nationwide. Since then the state leadership and experts in the state of California have made it a priority to educate and hold schools and students accountable through standards based instruction and assessments. To date this has not been the case for continuation high schools in the state of California.

The purpose of this mixed methods Delphi study was to identify appropriate assessment methods for California continuation high schools, to rate the respective effectiveness of the identified methods, and …

Building Career And Technical Education Capacity In California's Secondary Schools, Carol Tsushima

Dissertations

Purpose: The purpose of this study was to identify the barriers to building secondary career technical education (CTE) capacity and the best means of overcoming those barriers from the perspective of the California regional occupational centers and programs (ROCPs). Methodology: Using a Delphi method, a panel of 15 CTE experts provided input through 4 rounds of anonymous electronic surveys. Conclusions: Utilizing the resources within the state’s ROCP system helped to identify barriers not addressed in the current literature or research. The impact of funding fluctuations, the limitations of the traditional school schedule, and the need to be …

The Role Of Information And Reflection In Reducing The Bias Blind Spot: A Cross-Cultural Study, Wejdan Shukri Felmban

Dissertations

The current study examined whether two types of intervention reduced the "bias blind spot" (i.e., perceptions of others being more biased than one’s self) and whether the bias blind spot was related to culture, reasoning performance, and motivation. The design was a 2 (information: reading or not reading about the bias blind spot) x 2 (reflection reflecting on the effects of biases on other or non-relevant reflection) x 2 (priming: reasoning tasks completed before or after the interventions). Students (N = 193) from Western and Middle Eastern cultures participated online or in a class. In each condition, participants responded to …

Deposition And Characterization Of Carbon Nanotubes (Cnts) Based Films For Sensing Applications, Amila C. Dissanayake

Dissertations

The advent of carbon nanotubes (CNTs) has opened up lot of novel applications because of their unique electrical and mechanical properties. CNTs are well known material for its exceptional electrical, mechanical, optical, thermal and chemical properties. A single-wall nanotube (SWNT) can be either semiconducting, metallic or semi-metallic, based on its chirality and diameter. SWNTs can be used in transistor device as active channels due to high electron mobility (~10000 cm2/(V s), electrical interconnects, nano-scale circuits, field-emission displays, light-emitting devices and thermal heat sinks due to low resistivity, high current density (~109A cm-2) and high thermal conductivity (~3500 W m-1). Further, …

Deep Fluid Inputs Into The Continental-Scale Nubian Sandstone Aquifer System Constrained By Hydrochemical, Stable Isotope, And Noble Gas Data, Abdel Mawgoud Mohammed

Dissertations

The Nubian Sandstone Aquifer System (NSAS) of northeastern Africa is one of the largest confined fossil-water aquifer systems in the world, with several nations relying on it (Egypt, Libya, Sudan and Chad). This groundwater is the biggest and in some cases the only future source of water to meet the development goals of each NSAS country. This study provides new geochemical data from the main oases of the Western Desert of Egypt and a compilation of published hydrochemical data from the regional aquifer. Interpretation of results suggests heterogeneous fluid mixing within the aquifer, the potential for hydrochemical sub-basins, and a …

Active Learning Strategies And Vocabulary Achievement, John Robert Griffith

Dissertations

Using a quantitative method of data collection, this research explored the question: Do active learning strategies used in grades 5 and 6 affect student vocabulary achievement in a positive or negative direction? In their research, Wolfe (2001), Headley, et al., (1995), Freiberg, et al., (1992), and Brunner (2009) emphasize the importance of understanding how children learn through active learning processes such as hands-on opportunities, cooperative learning, and technology-based instruction. Other researchers such as Baker, et al., (2000), Nagy, et al., (1987) and Searfoss, et al., (2001) stress the importance of meaningful vocabulary instruction when teaching reading. This study supports their …

The Art Of Multiphonics: A Progressive Method For Trombone, Matthew William Haislet

Dissertations

The Art of Multiphonics serves as a resource for trombone players and teachers wanting to develop multiphonic technique in order to approach the literature for which this technique is required. Its further aims are to provide accurate and relevant information regarding (1) subjective tones and beats, (2) the tuning of multiphonic intervals, and (3) vocal technique. Designed to be accessible to players of intermediate to advanced abilities, this method contains progressively arranged exercises for vocal and split-tone multiphonics. The first five chapters of the method are devoted to vocal multiphonics and contain individual subchapters that focus on one aspect of …