Digital Commons Network^™

Indirect Matrix Converter As Standard Power Electronic Interface, Andrés Escobar-Mejía

Graduate Theses and Dissertations

The increase in the penetration levels of distributed generation in the modern power grid and its importance in future energy systems have accelerated the interest of developing new power electronic interfaces for the energy conversion process. The feasibility of applying the indirect matrix converter as the standard power electronic interface for applications with power ratings from several kW to few MW is addressed in this dissertation. Special attention is given to those applications where space dominates the power electronic requirements. The main motivation for using the indirect matrix converter is that eliminates the energy storage component in the way of …

Metal Assisted Nanowire Growth For Silicon Nanowire/Amorphous Silicon Composite Solar Cell, Asmaa Ali Sadoon

Graduate Theses and Dissertations

Solar cells are photovoltaic devices that convert the energy of light to electricity by the photovoltaic effect. Crystalline silicon-based solar cells are the most dominant solar cells in the market today due to the high efficiency and relatively low cost. However, the cost of such solar cell is still high due to the large amount of material that is consumed in fabricating such a device. Polycrystalline/amorphous thin films and nanomaterial technologies have emerged to reduce the high cost of c-Si based solar cells and increase the efficiency. In this research, we combined these two technologies to propose and fabricate silicon …

The Role Of Quantum Dot Size On The Performance Of Intermediate Band Solar Cells, Najla Alnami

Graduate Theses and Dissertations

The goal of this thesis is to understand possible mechanisms for the reported decrease of the open circuit voltage and solar cell efficiency in quantum dot (QD) intermediate band solar cells (IBSCs). More specifically, the effect of indium arsenide (InAs) QD height on the open circuit voltage and solar cell efficiency was studied in a systematic way. To explore this effect in QD solar cells, several solar cells (SCs) were grown with varying InAs QD heights. All experimental characteristics of the QD solar cells were compared to a reference structure without QDs. All samples were grown by Molecular Beam Epitaxy …

The Elimination Of Listeria Monocytogenes Biofilms From Stainless Steel Deli Meat Slicer Components By The Use Of Hurdle Technologies, Alexandria Wynne Mertz

Graduate Theses and Dissertations

Listeria monocytogenes growth is of the greatest concern amongst ready-to-eat foods. The United States Department of Agriculture's Food Safety and Inspection Services determined that deli luncheon meats pose the greatest risk of contamination from L. monocytogenes Industrial meat slicers have many removable parts that are connected with sealers and gaskets, which can become worn over time. These spaces cannot be cleaned adequately, therefore are susceptible to bacterial growth. Planktonic cells form biofilms in order to protect the cell from adverse conditions, like during routine cleaning and sanitation. Once a biofilm is formed, the bacteria are much more difficult to eradicate …

Recreational Risk Assessment Using Geospatial Analyses On Beaver Lake, Arkansas, Laura Ahrens

Graduate Theses and Dissertations

Accidents and deaths occur regularly on lakes and waterways due to natural phenomena as well as human error and recreation. People use lakes and waterways as sources of recreation, but do not always act responsibly on the water. During summer 2013 and winter 2014, over 100 surveys were administered in Beaver Lake, Arkansas to local and federal agencies regarding their knowledge and perception on accident locations and causes. These surveys were conducted in English and approved by the university after being tested on peers. The surveys included demographic data sex, income, education, as well as Likert-scaled responses. Research was also …

Why Don't They Give Back: Alumni Giving At Two Historically Black Colleges And Universities, Jasmine A. Pope

Graduate Theses and Dissertations

Throughout the literature, HBCU alumni non-donors were perceived to possess the opposite characteristics of alumni that do give financially. In order to further examine the lack of alumni giving at HBCUs, this study evaluated previously identified characteristics of HBCU alumni that choose not to financially support their alma maters. The purpose of this study was to examine how income, student experience, religious charitable giving, alumni perceptions, and alumni engagement, relate to alumni giving at HBCUs. An explanatory correlational design was used to address the research questions posed in this study. The 4,500 person sample, which consisted of donors and non-donors, …

"We Can't Reclaim What We Don't Understand": Teachers' Perceptions Of Advocacy And Voice In A Rural Institute Of The National Writing Project, James Anthony Anderson

Graduate Theses and Dissertations

This study examines teachers' perceptions of advocacy and voice in a summer institute of the National Writing Project. The Rural Advocacy Institute, a first-time initiative through the Northwest Arkansas Writing Project, offered three weeks of professional development centered on rural education and teaching English language arts in rural public schools. The study is a grounded theory study; grounded theory forces the researcher to stay "close to the data," compare data sets, and use reflective writing to identify conceptual categories in the data. Data collection in the study included semi-structured interviews with six K-12 teachers participating in the Institute and twenty-seven …

Enhancement Of Antimicrobial Activity Of Naturally Occuring Phenolic Compounds By Nano-Particle Mediated Delivery Against Listeria Monocytogenes, Escherichia Coli O157:H7, And Salmonella Typhimurium, Madhuram Ravichandran

Graduate Theses and Dissertations

Food-borne illnesses are of major concern in the U.S. and worldwide. Salmonella,Listeria,E. coli O157:H7 continue to be some of the major foodborne pathogens. Recurring recalls due to these pathogens demand critical antimicrobial strategies to decontaminate the food through its procession from farm to fork. In our study, we combined the effectiveness of naturally occurring phenolic compounds individually, with/ without ethylenediamine tetraacetic acid (EDTA) and/or Nisin and nanoparticle delivery to improve the antimicrobial potential of the compounds against Listeria monocytogenes (L.m.), Salmonella Typhimurium (S.T.), and Escherichia coli O157:H7 (E.c.), in brain …

It's All In A Meme: A Content Analysis Of Memes Posted To 2012 Presidential Election Facebook Pages, Bobbie Foster

Graduate Theses and Dissertations

This thesis was an exploratory study to understand how Democrats and Republicans design memes, use traditional media framing, and how memes fit into modern humor theories. The study explores the relationship between the traditional media frames of the ideal candidate, populist campaigner, and the sure loser (Grabe & Bucy, 2009) and the commentary added by Internet users to these images in the memes.

The study also applies the benign-violation theory (McGraw & Warren, 2010) to the analysis of memes to understand the design choices made by meme creators. The benign-violation theory states that a physical or psychological violation is benign …

Incarcerating Exceptional Pupils: Is There A School-To-Prison Pipeline In Eastern Oklahoma?, Brett Alan Fitzgerald

Graduate Theses and Dissertations

The school-to-prison pipeline metaphor represents an educational environment that allows public schools to push many at-risk children out of school and into the juvenile justice system or even worse, the adult criminal justice system (Wald and Losen, 2003; Lynn, 2010; Tuzzolo and Hewitt, 2006). The purpose of this study is to examine whether a school-to-prison pipeline exists in eastern Oklahoma, and if so, to better understand the characteristics of the public schools that may be contributing to it. The school-to-prison pipeline metaphor guided three research questions regarding whether certain public schools in eastern Oklahoma referred greater percentages of their students, …

Understanding Service Utilization Disparities And Depression In Latino Parents And Children: The Role Of Fatalismo, Elizabeth Anastasia

Graduate Theses and Dissertations

Research has repeatedly demonstrated a disparity between need and utilization of mental health services for Latino adults and children. The adapted Health Beliefs Model (Henshaw & Freedman-Doan, 2009) provides a useful framework for conceptualizing the roles of perceived severity and therapy expectations in the relation between demographic variables and service utilization. Cultural variations in perceptions of mental illness by Latinos may be linked with lower service utilization rates for Latino parents and children. It was speculated that fatalismo, a cultural construct similar to external locus of control, may be related to perceptions of mental illness and service utilization outcomes for …

Increased Effluent Dosage Effects On Septic System Absorption-Field Products Of Differing Architecture Types, Andrew Richard Gibbons

Graduate Theses and Dissertations

Nationwide, approximately 20% of all homes use an on-site septic system as a form of household wastewater treatment. Since karst features are prevalent throughout the Ozark Highlands region of Northwest Arkansas, surface and groundwater resources are susceptible to contamination. Therefore, the objectives of this study were to evaluate the effects of soil condition (i.e., wet and dry) and absorption-field-product architecture type [i.e., chamber, gravel-less-pipe (GLP), polystyrene-aggregate (PSA), and pipe-and-aggregate (PA)] on in-product solution storage and biomat thickness in a profile-limited soil, and to identify the long-term acceptance rate (LTAR) of each product. During Phase I of this study (i.e., March …

Screening Diverse Soybean Germplasm For Water-Logging Tolerance, John Franklin Carlin

Graduate Theses and Dissertations

Water-logging can be detrimental to soybean growth and development; effects range from chlorosis and stunting to yield loss and plant death. Soybean response to, and the effects of, water-logging are dependent on the growth-stage of the plant at the initiation of water-logging. The objectives of this study were to screen a diverse soybean germplasm collection for water-logging tolerance (WLT) at both the V5 and R1 growth stage and to develop a method to screen soybean for WLT in greenhouse. One hundred thirty five genotypes consisting of historical genotypes, PIs, drought and WLT tolerant breeding lines were screened for WLT in …

Monsters In Common: Identity And Community In Postapocalyptic Science Fiction After 9/11, Jeremy J. Burns

Graduate Theses and Dissertations

In the aftermath 11 September, 2001, postapocalyptic science fiction has offered a way to make sense of the events of that day, as well as the years of social, cultural and political upheaval that have followed. In many ways, 9/11 began immediately to take on apocalyptic significance in the American national narrative, seemingly marking the end of one period and the beginning of another, entirely different one. To think of 9/11 as a kind of apocalyptic break with the past, however, does not tell the whole story. Moreover, such thinking denies key historical linkages between the American response to 9/11 …

Paper People And Digital Memory: Recreating The Public And Private In Japan, Meghan Sarah Fidler

Dissertations

This research examines how reading and writing on digital platforms establishes public and private spheres in Tokyo, Japan. Based upon findings from a group of students at an international University, I develop new modes of thinking about people and their use of Internet capable devices by exploring the paradoxes present in contemporary literacies. Contextualizing reading and writing within the speech patterns and exchange rituals (aisatsu) which mark public spheres in Japan, writing practices are found to reflect multiple nuanced identity performances in which the varied use of the cultural principles uchi/soto (inside/outside) and ura/omote (back/front) create parallel publics. Constructed by …

The Rise Of Anti-Semitism In Post Cold War Western Europe: The Effect On Current Jewish Populations In Europe, Jewish Human Rights, And The Role Of The Jewish Religion Within Western Europe, Johnathan Eftink

Arts & Sciences Graduate Student Theses and Dissertations

Since the ending of World War II and the Cold War, anti-Semitism has been prevalent within Western Europe even though the political atmosphere has tried to dissuade and even punish those that harbored such views. The rise of anti-Semitism in Western Europe in contemporary times as evolved into a dangerous atmosphere for Jews in regards to their human rights, their freedom, and their safety. In this paper, the question of why anti-Semitism is re-emerging will be addressed as well how it is being tackled by the respective countries in which it is prevalent. Poland, Hungary, Greece, France, and Germany are …

Probabilistic Latent Document Network Embedding, Tuan M. V. Le, Hady W. Lauw

Research Collection School Of Computing and Information Systems

A document network refers to a data type that can be represented as a graph of vertices, where each vertex is associated with a text document. Examples of such a data type include hyperlinked Web pages, academic publications with citations, and user profiles in social networks. Such data have very high-dimensional representations, in terms of text as well as network connectivity. In this paper, we study the problem of embedding, or finding a low-dimensional representation of a document network that "preserves" the data as much as possible. These embedded representations are useful for various applications driven by dimensionality reduction, such …

Extracting Interest Tags From Twitter User Biographies, Ying Ding, Jing Jiang

Research Collection School Of Computing and Information Systems

Twitter, one of the most popular social media platforms, has been studied from different angles. One of the important sources of information in Twitter is users’ biographies, which are short self-introductions written by users in free form. Biographies often describe users’ background and interests. However, to the best of our knowledge, there has not been much work trying to extract information from Twitter biographies. In this work, we study how to extract information revealing users’ personal interests from Twitter biographies. A sequential labeling model is trained with automatically constructed labeled data. The popular patterns expressing user interests are extracted and …

The Greenback, The Humpback, And The Silverback: How A Third Wave Of Federal Water Policy Could Benefit The West, Reed D. Benson

Faculty Scholarship

Proposing any major new federal initiative regarding water in the western United States might seem preposterous, given conventional wisdom and entrenched positions on state control of water resources. But there is a strong rationale, and a growing imperative, for a new federal water .policy for the West. Many river basins face serious problems as limited water supplies are over-allocated, demands continue to increase, and climate change promises to exacerbate the West's perennial problems of scarcity and variability. Solutions to such problems are likely to be expensive and will need to address national interests as well as state and local concerns. …

First Amendment Sexual Privacy: Adult Sexting And Federal Age-Verification Legislation, Jennifer M. Kinsley

New Mexico Law Review

The modern sexting phenomenon amongst adults raises important questions at the intersection of relational privacy, free expression, and federal criminal law. A little-known but long-standing federal statutory scheme—18 USC 2257, 2257A, and the accompanying Attorney General regulations (“Section 2257”)—threatens to criminalize the private exchange of sexual communication between consenting adults. While there has been relatively frequent litigation involving Section 2257 initiated by the commercial adult entertainment industry, courts and scholars alike have been all but silent as to Section 2257’s impact on private, not-for-profit sexual speech. So too has the literature on the legality of sexting focused almost exclusively on …

When The Mountain Goes To Mohammad: The Internet And Judicial Decision-Making, Layne S. Keele

New Mexico Law Review

Part I of this Article explores that ambivalence by examining conflicting judicial canons and court opinions addressing the issue. Part II examines the benefits and drawbacks of judicial Internet research with respect to adjudicative facts. In particular, it elaborates on arguments offered by defenders of this kind of research, most notably Judge Richard A. Posner. Part II also highlights the dangers by showing that adjudicative fact research detracts from the reliability of our justice system and undermines due process of law. Part III addresses judges’ online research of legislative facts. It discusses the use of legislative facts by courts generally, …

Continental-Scale Isotope Hydrology, Scott Jasechko

Earth and Planetary Sciences ETDs

Providing sustainable sources of fresh water for a growing population of 7 billion people is one of the grand challenges of the 21st century. This dissertation outlines several applications of isotope hydrology to address four previously unknown questions involving surface- and ground-water resources at regional- to continental-spatial scales over contemporary- to millennial-temporal scales. The four chapters in this dissertation investigate (1) the rate of plant transpiration, (2) the seasonality of groundwater recharge, (3) the climate of the last ice age, and (4) the chemistry of Ugandan waters. (1) Chapter one presents a new global compilation of lake water isotopic data, …

Afro-Colombians And The Encroachment Of Paramilitaries On The African Palm Oil Sector, Stacie Hecht

Anthropology ETDs

The African palm oil industry in Colombia has burgeoned in the last decade, with state-sanctioned promotions and new developmental productions for the expansion of these plantations seeking to provide economic stability for the country. In addition, with the passing of the Free Trade Agreement between the United States and Colombia in 2011, as well as deals with several European countries for the exportation of the product, comes an even greater demand than previously known for the industry. However, the continuation of this endeavor will lead to the devastation of the bio-diverse lands being used for economic gains. Furthermore, palm oil …

A Comparative Analysis Of Instructional Techniques Toward Long-Term Positive Ergonomics Transformation For The Early Career Sonographer, Jody L. Hancock

Masters Theses and Doctoral Dissertations

The past two decades have demonstrated sonographer work-related musculoskeletal disorder (WRMSD) rates between 80.0 to 90.4%. A surprising revelation made by sonographers was that educators were not perceived as the primary providers of ergonomics instruction. For these reasons, a mixed methods study was performed, involving a causal-comparative component with a longitudinal perspective, a quasi-experimental element, and limited observations and interviews. The study followed four years of sonography graduates through the early career scan period, comparing transmissional, transactional, and transformational learning results. The study’s goal was to determine whether transformative ergonomics learning in a collaborative and reflective environment could demonstrate a …

The Impact Of Participation In Online Social Networking On Parenting Stress Levels Of Single Mothers, Djuana A. Tomlin

Masters Theses and Doctoral Dissertations

The U.S. Census Bureau (2012) estimated that there were 15.2 million female householders with no husband present. Many single mothers experience a high level of stress due to feelings of isolation and alienation from friends and family and having to deal with social, economic, and personal issues alone. This study evaluated the impact of participation in a social network site (SNS) on the stress levels of single mothers for the purpose of using updated resources to replicate and expand upon the initial work of Dunham et al. (1998). This study sought to answer the following research questions: Does participation in …

Mystical Experience As Predictor Of Domains Of Religious And Spiritual Self Identification: Empirical And Theoretical Considerations, Sara E. Hall-Mckane

Masters Theses and Doctoral Dissertations

The concept of spirituality has emerged as a major focal point in both the theoretical and empirical study of religion. Whether the emergence of spirituality is a dimension of religion or a separate and distinct construct has been the subject of much debate among scholars. The philosophical arguments proposed on either side have underscored the need for further research into just what spirituality is and is not. An ongoing transition from a more religious to a more spiritual self identification is evident at least in the United States (Roof & Greer, 1993, 1999; Pargament, 1999). Using the data collected from …

The Effects Of Co-Viewing Children’S Educational Programming On Parental Communication Patterns, Chris M. Willis

Masters Theses and Doctoral Dissertations

The purpose of this study was to examine the potential impact that children’s educational television programs can have on parents’ communications with their children when they co-view such programming together. The literature review provided a rich foundation of research on education television. Studies showed many positive effects can be observed when children view appropriate amounts of curriculum-based programs, such as Sesame Street (Gentzkow & Shapiro, 2006), and these effects were amplified when a parent or caregiver co-views the programs with them (Fujioka & Austin, 2002). This study added to the existing body of research by focusing on how parents were …

Adaptive Underfrequency Load Shedding Based On Real Time Simulation, Mosab Salah Aldeen Mohamed Zeyada

Masters Theses and Doctoral Dissertations

Conventional Underfrequency Load Shedding (UFLS) is used to balance generation and load when underfrequency conditions occur. It sheds a fixed, predetermined amount of load irrespective of disturbance location. Several adaptive UFLS schemes are proposed in the literature. Recent research discussed utilizing synchrophasor messages to implement adaptive UFLS but these studies have been using virtual PMUs. Of late, hardware implementations for adaptive UFLS scheme using actual Phasor Measurement Units (PMUs) are reported but also these studies are based on small power systems. This study presents hardware implementation of adaptive UFLS based on real time simulation of IEEE39-bus system. The simulation tool …

Jean-Luc Godard And Francois Truffaut: The Influence Of Hollywood, Modernization And Radical Politics On Their Films And Friendship, Caroline Glenn

All Theses

During the late 1950's the French film industry's hard-won financial stability during the Occupation and liberation years had all but disappeared. Combined with the dwindling, unpredictable nature of French audiences, the multi-star, literary adaptation dramas French studios produced were no longer reliable. In response to these dilemmas a transformation took place in French cinema. Known as the nouvelle vague (or French New Wave), the movement was largely, but not completely, a reaction to France's declining film industry. The nation as a whole was undergoing significant change and growth during the 1950s. From the Algerian conflict, the Fourth Republic's collapse and …

How Wartime Detention Ends, Deborah N. Pearlstein

Cardozo Law Review

No abstract provided.