Digital Commons Network^™

Optical Enhancement In Periodic Plasmonic Gratings For Sers And Metal-Semiconductor-Metal Photodetectors (Msm-Pds) Applications, Ahmad Aziz Darweesh

Graduate Theses and Dissertations

This dissertation is aimed to numerically study the effect of plasmonic grating electrodes on the efficiency of metal-semiconductor-metal photodetectors (MSM PDs) and the sensitivity of Surface Enhanced Raman Spectroscopy (SERS). This research can benefit many areas of nanoscience and optics, including plasmonic applications, such as, super lenses, nano-scale optical circuits, optical filters, surface plasmon enhanced photo-detectors solar cells, imaging sensors, charge-coupled devices (CCD), and optical-fiber communication systems. Several parameters, wire widths and thickness, gap space, taper angle, and the incident wavelength and angle, were investigated. The goal of this research is to utilize the plasmonic phenomenon by using plasmonic gratings …

A Silicon Germanium Cmos Linear Voltage Regulator For Wireless Agricultural Applications, Aminta Naidili Castillo Robles

Graduate Theses and Dissertations

This thesis presents the design, simulation and test results of a silicon germanium (SiGe) complementary metal-oxide-semiconductor (CMOS) linear regulator. The objective of the circuit is to power other analog devices regardless of the load current and input voltage changes. The application of this regulator is to be part of a project developing a miniaturized semiconductor platform that can be inserted into stems of crops in order to measure data inside the plant and then send it wirelessly to the user. The linear regulator was designed on a BiCMOS SiGe 0.13µm which is a GlobalFoundries process. It has been tested at …

Comparison Of Physical Intensity Between Interactive Video Game Cycling And Conventional Stationary Cycling In Adolescents With High Functioning Autism Spectrum Disorder, Tariq Mohammed Alsoqairan

Graduate Theses and Dissertations

Background: Obesity has become a serious health concern in adolescents with autism spectrum disorder (ASD). Researchers have indicated that sedentary behaviors, especially technological activities, such as video games and other forms of screen-based activities is the main barrier to participate in physical activities. Active video games have demonstrated the efficacy in increasing physical activity and reducing body weight in children and adolescents with disabilities.

Purpose: The purpose of the study was to examine the exercise intensity and enjoyment level of interactive video game cycling (IVGC) in comparison with conventional stationary cycling (CSC) during matched number of sessions utilizing the same …

Differences In Kaplan Integrated Exam Scores Based On Institutional Factors, Lee Ann Danner

Graduate Theses and Dissertations

Registered Nurses constitute the largest health care occupation in the United States. Current entry-level education for the profession of nursing is either an Associate Degree in Nursing (ADN) or Bachelor of Science in Nursing (BSN) (Altman, 2011). After successful completion of a nursing program, all nursing graduates must apply to take the National Council Licensure Examination (NCLEX-RN). The pass rate for first time United States educated NCLEX-RN exam test takers in 2017 was 87.11% leaving 12.89% unsuccessful (NCSBN, 2018). A nursing programs quality and recruitment are often influenced by a students’ ability to pass the NCLEX-RN on the first attempt. …

Does Grit Matter? A Correlational Study Of The Relationship Between Grit-S Assessment Scores And Student Retention In Undergraduate Online Programs, Kay Best Murphy

Graduate Theses and Dissertations

Historically, colleges and universities have used intelligence-based admissions tests to select students who demonstrate the intelligence to succeed academically. These institutions also have employed strategies to help students stay in school and graduate. However, despite tests and support strategies, the National Center for Education Statistics in 2018 reported a six-year completion rate of about 60% of first-time, full-time bachelor’s degree-seeking students for the 2010 cohort, including both traditional and online students. One study shows retention in online classes can be 10% to 15% lower than in traditional face-to-face courses (Carr, 2000). Meanwhile, higher education institutions today face increasing pressure to …

Seeking Success: A Case Study Of African American Male Retention At A Two-Year College, Richard Latroy Moss

Graduate Theses and Dissertations

There is a problem in higher education in the United States. African American students, specifically males, are not being retained and graduating. This problem is even more evident for students that attend two year colleges. African American male students lag behind white males, Hispanic males and African American females, in retention and graduation rates. This problem has caught the attention of many leaders. Policy makers and college leaders are among those who seek to understand the why and find solutions to the challenge of African American male student retention at two year colleges, as two year colleges are becoming the …

Development Of Anti-Icing Airfield Heated Pavement Systems Using Solar Energy, Joseph Daniels

Graduate Theses and Dissertations

This dissertation analyzes developing and assessing the viability of an anti-icing airfield heated pavement system using solar energy. This study includes two components, a field experimentation component and a numerical analysis component. Field experimentation investigates two systems: (1) an electrical heated pavement system with a photovoltaic energy system as its power source, and (2) a hydronic heated pavement system with a solar water-heating system as its heating source. The systems operate under an automated thermostat heating sequence for operation optimization and energy conservation. Study results found the solar systems capable of supplying enough energy to maintain pavement surface temperature above …

Understanding And Predicting Nematode Damage On Soybean Using Spatially Weighted Analysis, Barry Boney

Graduate Theses and Dissertations

Aerial imagery offers great potential as a predictive scouting method and could allow growers to better understand crop performance over time. Evidence suggests that the seed treatments fluopyram and abamectin result in decreased reproduction and root galling by Meloidogyne incognita, but yield protection in fields with higher or different nematode pressure is unclear. The objective of this work was to determine the efficacy of these seed treatments compared to 1,3-dichloropropene (1,3-D) applied site-specifically and then predict where these might best be applied to other fields. In a soybean field infested with M. incognita, apparent electrical conductivity was highly correlated with …

The Effect Of Incorporating End-User Customization Into Additive Manufacturing Designs, Jonathan D. Ashley

Graduate Theses and Dissertations

In the realm of additive manufacturing there is an increasing trend among makers to create designs that allow for end-users to alter them prior to printing an artifact. Online design repositories have tools that facilitate the creation of such artifacts. There are currently no rules for how to create a good customizable design or a way to measure the degree of customization within a design. This work defines three types of customizations found in additive manufacturing and presents three metrics to measure the degree of customization within designs based on the three types of customization. The goal of this work …

Epidemiological Studies Of Soybean Vein Necrosis Virus And Potential Resistance Mechanisms To Its Vector Neohydatothrips Variabilis (Beach), Jing Zhou

Graduate Theses and Dissertations

Soybean (Glycine max (L.) Merrill) is one the most important crops in global agriculture with annual production of over 260 million metric tons. As the dependence of a growing global population to soybean has increased, so does the importance of soybean diseases and pests. Over 200 pathogens attack soybean; among them, viruses pose a major threat to the soybean industries accounting for approximately 10% of the annual yield reduction caused by diseases in the past two decades. Soybean vein necrosis virus (SVNV) is a relatively newly discovered virus causing the homonymous disease. The widespread occurrence of the disease in major …

Refining Effective Instructional Strategies Through Professional Learning Communities, James Kevin Hancock

Graduate Theses and Dissertations

The purpose of this study is to examine the effectiveness of professional learning communities by comparing practices and strategies of content and grade level teams in middle schools. Utilizing data from student assessment, comparison of teams in this middle school was conducted to determine practices and conversations that have an impact on teachers’ decisions about student learning. Understanding phenomenon that drives effective decision-making processes in teams of teachers creates an environment where shared leadership produces professional learning communities that are sustainable and systemic.

A qualitative approach was conducted in the form of a case study to capture themes relevant to …

Philosophia Soteria: How Occupational Safety And Health Professionals Influence Decision Makers, Daniel Jay Snyder

Graduate Theses and Dissertations

The purpose of this study was to identify ideas about how occupational safety and health (OSH) professionals influence decision-makers on matters impacting occupational health and safety management systems. A modified nominal group technique was used that involved 67 participants in ten nominal groups and identified the most important ideas about how OSH professionals can influence workplace safety and health decision making. The research produced themes of communication, scientific, professionalism, leadership, adaptability, and business acumen that resulted in six domains of occupational safety and health professional influence.

The Role Of Dialect Words In Children’S Social Decisions, Madison Rose Myers-Burg

Graduate Theses and Dissertations

Recent research suggests that young children are capable of distinguishing between phonetically dissimilar spoken accents, yet have difficulty distinguishing between phonetically similar accents (Wagner, Clopper, & Pate, 2013). The present study aimed to determine whether the presence of dialect-specific vocabulary enhances young children’s ability to categorize speakers. Participants completed four training trials in which they were familiarized with photos of two children: one of whom used American English labels for test objects and one of whom used British English labels. After training trials, participants completed eight test trials in which they were asked to infer which target child would use …

The Role Of Information Communication Technologies (Icts) In Shaping Identity Threats And Responses, Mary Macharia

Graduate Theses and Dissertations

With the rising use of social media, people are increasingly experiencing, and responding to, identity threats online. This sometimes leads to online backlash via “cybermobs” or the creation of online social movements that traverse offline. Prior information systems (IS) research on identity threats and responses largely focuses on information communication technology (ICT) implementations within organizations in an offline context. Therefore, we lack understanding of ICT-mediated identity threats and responses and ways to promote healthier and productive interactions online. This two-essay dissertation seeks to fill this gap. Essay 1 combines a review of ICT-mediated identity threats with a qualitative study (based …

Teacher Agency And The Implementation Of Restorative Justice, Jeffrey Hunt

Graduate Theses and Dissertations

The purpose of this mixed methods study was to examine the implementation of Restorative Justice in an urban central California high school through the lens of administrators, and teacher perceptions of agency, campus climate, and impact of the implementation. The participating school in this study defined their implementation of Restorative Justice as Restorative Practices. The Quality Implementation Framework (Durlak, Meyers, & Wandersman, 2012) guided the development of the literature review and created the framework for the study. This mixed-methods sequential explanatory study examined the relationship between teacher perceptions of agency, school climate, and the implementation of Restorative Practices. Teachers at …

Three Essays On Corruption And Collusion, Arlo Redwine

Graduate Theses and Dissertations

This dissertation studies corruption and collusion with data derived from a laboratory experiment and household data. In Chapter 1 I study experimental procurement auctions with bribery and a public reserve to test for the tacitly collusive equilibrium described by Compte et al. (2005). Three sellers compete for 40 periods to sell a single item to a computerized buyer who accepts bribes and determines ties in bids and bribes randomly. In the closing periods, only 13.5% of auctions display the collusive equilibrium, but 58.7% of selling prices are noncompetitive. In comparison with simulated predictions for auctions that are corrupt but competitive, …

A Support Program For College Students With Autism Spectrum Disorder: The Functioning Of Participants Versus Non-Participants And The Role Of Program-Sponsored Mentoring, Ayla Raven Mapes

Graduate Theses and Dissertations

Increasingly more students with autism spectrum disorder (ASD) are attending college. In response, many colleges are now offering these students the extra support of an Autism Support Program (ASP), many of which include a mentoring component. This study is one of only a handful of attempts to examine these programs empirically. Using a small sample of college students who identified as having ASD, I compared participants and non-participants of a university ASP. An online survey was used to assess demographic characteristics and pre-college academic performance, as well as students’ functioning across the following domains: social, adaptive, academic, emotional, and having …

Working-Class Graduates’ Perceptions Of The 7 Habits Of Highly Effective Teens Training And Its Impact On Their Life Choices And Future Success, Andrew Kenneth Ashley

Graduate Theses and Dissertations

The purpose of this phenomenological study was to examine working-class graduates’ perceptions of The 7 Habits of Highly Effective Teens training. This purpose was accomplished through a qualitative analysis of data. The data was collected from interviews of graduates and teachers. Following the coding process, graduate data was then reduced to the following categories: social awareness, relationship development, teamwork, communication skills, empathy, self-awareness, and self-confidence which created the themes of interpersonal skills and intrapersonal skills. Four additional graduate themes were created from decision-making data: weighing pros and cons, prioritizing outcomes, thinking long-term, and real-life applications. Additional graduate data was provided …

Burning Community Integration And Disability, Christopher Shane Brace

Graduate Theses and Dissertations

Individuals with anxiety and depression have always been marginalized and stigmatized. Individuals with “hidden” disabilities are encouraged by society to keep them hidden, or face ridicule and persecution. Society decreases their sense of self-worth, and self-efficacy by destroying any perception of normalcy. Social support resources are vital for individuals with anxiety and depression’s continued mental health. As time goes on the individuals experience a decrease in the amount of available resources, at the same time the need for them increases. These individuals need a way to quickly replenish their social resources and the Burning Man regional network creates a unique …

Microbiota Metabolic Product Deoxycholic Acid Prevents Campylobacter Jejuni Chicken Colonization Through Modulating Ceca Anaerobes, Bilal Ali Alrubaye

Graduate Theses and Dissertations

Campylobacter jejuni is a prevalent infectious enteritis mainly foodborne from chickens. Despite of reducing C. jejuni food contamination dramatically decreases campylobacteriosis, few effective approaches are available for the bacterial reduction in chickens. The aim of this study was to use microbial metabolic product deoxycholic acid (DCA) to reduce C. jejuni chicken colonization. Broiler chicks were fed 0 or 1.5 g/kg DCA, lithocholic acid (LCA), or urodeoxycholic acid (UDCA) in diets or orally gavaged with cholic acid (CA, 1.5g/kg body weight). Birds were also transplanted with DCA modulated anaerobes (DCA-Anearo) or aerobes (DCA-Aero). Birds were infected with 109 CFU/bird human clinical …

Investigation Of A Gan-Based Power Supply Topology Utilizing Solid State Transformer For Low Power Applications, Akrem Mohamed Elrajoubi

Graduate Theses and Dissertations

Gallium nitride (GaN) power devices exhibit a much lower gate capacitance for a similar on-resistance than its silicon counterparts, making it highly desirable for high-frequency operation in switching converters, which leads to their significant benefits on power density, cost, and system volume. High-density switching converters are being realized with GaN power devices due to their high switching speeds that reduce the size of energy-storage circuit components. The purpose of this dissertation research is to investigate a new isolated GaN AC/DC switching converter based on solid-state transformer configuration with a totem-pole power factor corrector (PFC) front-end, a half-bridge series-resonant converter (SRC) …

Delphi Study Identifying Future Technical Competencies For Architecture And Construction Educators, Jon Richard Jones

Graduate Theses and Dissertations

The purpose of this modified Delphi study was to identify the dominant technical competencies needed to effectively teach architecture and construction at the secondary and post-secondary level and to determine if there are differences of opinion among educators, recent graduates and business and industry personnel as to what those competencies should be.

At the time of publication, the menu of technical workshops offered by the Kansas Center for Career and Technical Education (KCCTE) was determined by the workshop administrator and the director of the KCCTE. To ensure that these workshops provide instructors with the knowledge and skills that align with …

Understanding The Relationship Between Corporate Social Responsibility, Team Identification, And Behavioral Intention With The Mediating Effect Of Satisfaction In Korean Professional Baseball League, Jaeman Son

Graduate Theses and Dissertations

The purpose of this dissertation was to provide a better understanding of how sport fans’ perceptions of a sport team’s CSR activities influence the behavioral intention of sport consumers. More specifically, the aim of this study was to propose and test a theoretical model that explore the relationship among perceived CSR and team identification and satisfaction, along with the behavioral intention. This study was to investigate the mediating role of customer satisfaction in the relationship between perceived CSR and behavioral intention. Finally, the study attempts to examine whether the relationship between team identification and behavioral intention is mediated by customer …

Risky Business: Millennials’ Protection Motivation Factors For Norovirus Outbreaks On College Campuses, Dylan Conrad Martinez

Graduate Theses and Dissertations

The risk and severity of hNoV transmission is obscurely recognized to foodservice millennial customers. Most commonly associated with cruise ships, consumers are not aware of its full potential to strike at other locations, especially college campuses. For the foodservice industry and the university community, it is imperative that a proactive method for increasing millennials’ motivation to practice mitigation methods emerges to reduce future hNoV outbreaks on college campuses. Research has shown that students can play a major role in the spread of hNoV on college campuses. Therefore, the purpose of these studies is to examine motivations for health protective behaviors …

Access To Children's Books Featuring Characters With Disabilities, Jacquelyn Thompson

Graduate Theses and Dissertations

Shared reading and access to print have been linked to improved outcomes for young children and linked to socio-economic status (e.g Neuman, 1999; Zucker, Cabell, Justice, Pentimonti & Kaderavek, 2013). As a community, we know very little about the access to books that the diverse population of preschool age children from Northwest Arkansas have. Moreover, we know very little about the type of books available to them. This study seeks to understand how many children’s books are in select preschools of varying socioeconomic status within Northwest Arkansas that service those with and without disabilities. More pointedly, within the children’s book …

Quasi-Particle Band Structure And Excitonic Effects In One-Dimensional Atomic Chains, Eesha Sanjay Andharia

Graduate Theses and Dissertations

The high exciton binding energy in one dimensional (1D) nano-structures makes them prominent for optoelectronic device applications, making it relevant to theoretically investigate their electronic and optical properties. Many-body effects that are not captured by the conventional density functional theory (DFT) have a huge impact in such selenium and tellurium single helical atomic chains. This work goes one step beyond DFT to include the electron self-energy effects within the GW approximation to obtain a corrected quasi-particle electronic structure. Further, the Bethe-Salpeter equation was solved to obtain the absorption spectrum and to capture excitonic effects. Results were obtained using the Hyberstein-Louie …

The Impact Of Coaches' Character On Youth Basketball Players, Natasha Hill

Graduate Theses and Dissertations

If utilized effectively, recreation and sports can serve as major tools for developing youth, improving the educational environment, and increasing the number of productive adults that are healthier physically and mentally to positively impact society. Most research targeting recreation and sports developing youth has the perspective primarily of parents and youth. Evaluating the character strengths of coaches and youth athletes who actively participate in team basketball is vital.

An exploration of the value of basketball and character strengths of (n = 64) youth athletes, between the ages of 12 to 16 years, and the impact of their involvement with coaches …

Automatic Performance Optimization On Heterogeneous Computer Systems Using Manycore Coprocessors, Chenggang Lai

Graduate Theses and Dissertations

Emerging computer architectures and advanced computing technologies, such as Intel’s Many Integrated Core (MIC) Architecture and graphics processing units (GPU), provide a promising solution to employ parallelism for achieving high performance, scalability and low power consumption. As a result, accelerators have become a crucial part in developing supercomputers. Accelerators usually equip with different types of cores and memory. It will compel application developers to reach challenging performance goals. The added complexity has led to the development of task-based runtime systems, which allow complex computations to be expressed as task graphs, and rely on scheduling algorithms to perform load balancing between …

Perceptions Of E-Learning By Management Trainees In A Small, Fast Food Restaurant, Anthony A. Longo

Graduate Theses and Dissertations

Small businesses account for a majority of U.S. jobs and play a vital role in the economy. However, the survival rate for small businesses is disconcerting. Only half of the small businesses will survive five years or more and one-third ten or more years. Fast food restaurants are part of the food and drinking industry. It is the second largest industry in the United States and the most vulnerable to business failure. Research has shown the capabilities of small business managers can play a significant role in the success or failure of a small business, but little research has been …

Optimizing The Plasmonic Enhancement Of Light In Metallic Nanogap Structures For Surface-Enhanced Raman Spectroscopy, Stephen Joseph Bauman

Graduate Theses and Dissertations

Technology based on the interaction between light and matter has entered something of a renaissance over the past few decades due to improved control over the creation of nanoscale patterns. Tunable nanofabrication has benefitted optical sensing, by which light is used to detect the presence or quantity of various substances. Through methods such as Raman spectroscopy, the optical spectra of solid, liquid, or gaseous samples act as fingerprints which help identify a single type of molecule amongst a background of potentially many other chemicals. This technique therefore offers great benefit to applications such as biomedical sensors, airport security, industrial waste …