Digital Commons Network^™

Fundamental Studies Of Magnetoconvective Forces And Density Gradients In A Microfluidic Environment, Adam James Kreidermacher

Graduate Theses and Dissertations

Magnetoconvection is a promising phenomenon for developing new electrochemical-based microfluidic flow devices with unique capabilities, such as easily switching flow direction and adjusting flow speeds and flow patterns as well as avoiding bubble formation. In order to develop these devices it is necessary to study the underlying forces. Four contributions toward fluid flow were considered. The first and foremost is the magnetohydrodynamic force, which is the magnetic component of the Lorentz force and governed by the right hand rule. It generates the majority of the convention, and is the most well-known. The second is the gravitational force, which causes convection …

The Impact Of A Ballot Education Program On Arkansas Voters, Kristin Netterstrom Higgins

Graduate Theses and Dissertations

The University of Arkansas Division Of Agriculture’s Public Policy Center has educated Arkansas voters about statewide ballot issues for 10 years. The ballot issue education program, was evaluated during the 2014 election cycle to determine the program’s impact on voters. This descriptive study sought to describe program participants, to determine knowledge transfer of county agents, to describe knowledge acquisition of program participants, and to measure whether people who attended Cooperative Extension Service presentations made informed choices on Election Day. Researchers found that program participants were mostly older, educated, White women. There were increases in knowledge among participants who read fact …

Identifying Leadership Perceptions Of Desired Competencies Of Agricultural Sales Students And Agricultural Sales Industry Professionals, Sarah Beann Wright

Graduate Theses and Dissertations

The two articles presented in this thesis used both quantitative and qualitative research methods to evaluate competencies among agricultural business students and agricultural sales professionals respectively. In the first study, students enrolled in the Fall 2014 agribusiness sales course at [State] University (n = 97), participated in a pre and post evaluation comprised of leadership assessments to determine the change in introversion and extroversion, task-oriented and relationship-oriented, and finally strength characteristics over the time period of an academic semester. Students presented to be from a variety of leadership backgrounds. Posttest results reported students being both high task (62.89%) and high …

Redefining Access To Public Space: Community Relations In A New Immigrant Setting, Aaron Isaac Arredondo

Graduate Theses and Dissertations

This article examines how and to what extent charging an entrance fee at a public recreational space in a new immigrant setting affects the participation of Latino and migrant population groups at The Jones Center for Families (JCF) in Springdale, Arkansas. This study also documents how participants respond to the entrance fee system by looking at their available options to spend leisure time when living in an area with limited financial resources and recreational facilities. Using qualitative data collected in Northwest Arkansas (NWA), this study looks at how the transformation of JCF from a public to quasi-public space redefines relations …

A Cross Case Study Of Excellence In Science Fair Program Design, Kimberly Jones Murie

Graduate Theses and Dissertations

The purpose of this study was to identify components of schools with successful science

fair programs. Ideally schools interested in starting or improving their science fair programs could find a way to emulate some of the identified components. Successful was defined by having received recognition on some level at the International Science and Engineering Fair at least nine out of the last ten years. Twelve schools were identified as meeting this definition and five agreed to participate in the study. The schools represented diverse geographic areas as well as types of schools. Included in the study was a private school, …

Food Waste At Retail, Erin G. Killeen Davis

Graduate Theses and Dissertations

Food waste at retail represents forgone sales and embodies store management and disposal costs. Fresh produce is the largest contributing sector to food waste at retail and bulky, seasonal products are an added challenge when stores experience a high waste event. In order to improve, retailers need to better understand the costs of food waste, as well as how management strategies can impact these costs.

Using pumpkins as an example of bulky, seasonal products, a twofold research project was conducted to better understand contributors to, and costs of food waste at the retail level. In part one, using data from …

Understanding The Experiences Of African-American Relatives Who Serve As Care Providers To Custodial Children In Arkansas: An Intersectional Case Study, Carmen Johnson-Hardin

Graduate Theses and Dissertations

An increase in the provision of long-term care by relative caregivers to custodial children has brought attention to the physical, emotional, and Social challenges of this complex caregiving experience. Prior studies have examined separate structural identities that focus on comparing the quality of life, educational status, Social status, and income of grandparent custodial caregivers. To extend this research, it is important to explore the gaps in service provisions to relative caregivers; comparative viewpoints of relative caregivers and service providers regarding policies and practices; and heterogeneity among Black relative caregivers utilizing an intersectional framework. Face-to-face or telephone interviews were conducted with …

Adaptive Controller Using Runtime Partial Hardware Reconfiguration For Unmanned Aerial Vehicles (Uavs), Nikhil Thomas

Graduate Theses and Dissertations

The goal of this thesis is to explore the feasibility of a multirotor controller system which can dynamically change the arm configuration of a multirotor. Currently most of the multirotor systems have to be powered down, rewired, and programmed with new firmware, to configure how many arms/motors they use to fly. The focus of our effort is to develop a Field Programmable Gate Array (FPGA) based hardware/software controller which uses dynamic partial hardware reconfiguration to switch the arm/motor configuration of a multirotor during operation. We believe that this will make a multirotor more fault tolerant and adaptive. This thesis explains …

Experiences And Perceptions Of Community: The Fayetteville High School Community Photography Project, Stephanie Collier

Graduate Theses and Dissertations

The Fayetteville High School Community Photography Project was conducted with 10th-12th grade students in Spring 2014 as part of a participatory art project through their Sociology class. This study uses participant photographs and surveys to better understand student variation in community perceptions and connections. Participant photographs serve as a way to “see” how high school students perceive community. Survey data gathered on the same sample are used to measure individual-level characteristics such as perceived neighborhood deterioration, neighborhood satisfaction, and Social capital to better understand how they impact feelings of community connectedness in youth. Results indicate that Social capital plays an …

Automatic User Profile Construction For A Personalized News Recommender System Using Twitter, Shiva Theja Reddy Gopidi

Graduate Theses and Dissertations

Modern society has now grown accustomed to reading online or digital news. However, the huge corpus of information available online poses a challenge to users when trying to find relevant articles. A hybrid system “Personalized News Recommender Using Twitter’ has been developed to recommend articles to a user based on the popularity of the articles and also the profile of the user. The hybrid system is a fusion of a collaborative recommender system developed using tweets from the “Twitter” public timeline and a content recommender system based the user’s past interests summarized in their conceptual user profile. In previous work, …

A Comparison And Exploration Of Arkansas Professional School Counselor Activities Across Poverty, Angela Mccoy Harless

Graduate Theses and Dissertations

This study is an exploration of the actual and preferred practices of Arkansas K-12 school counselors in low, mid, and high-poverty schools using the School Counselor Activity Rating Scale (Scarborough, 2005), follow-up questionnaires, and interviews. The qualitative component of this study brings to light the contextual factors that prevent school counselors from providing direct and indirect services to students outlined in the ASCA National Model. This research study examines the hidden dynamics of the counselor/principal relationship and how this relationship has a pivotal role in the realization of a fully comprehensive developmental school counseling program. This study contributes to the …

Effects Of Food Label Education On Consumers' Sensory Perception And Awareness In Chicken Meat, Shilpa Samant

Graduate Theses and Dissertations

Recently, sustainability and process-related label claims have gained immense popularity especially for meat products like chicken. Apart from providing consumers with required product information, these labels have an impact on consumer perception and purchase behavior. The objective of this study was to determine whether providing label information affects consumers’ awareness and attitude toward the claims found on chicken products. Additionally, it was analyzed if enhanced label understanding affects consumers’ sensory and quality perceptions along with purchase intent. A total of 110 participants were randomly distributed into 1 of 3 types of education sessions: (1) reading a flyer (passive learning), (2) …

Fret Study Of Ligand Binding And Exchange Kinetics On The Surface Of Cdse/Zns Quantum Dots, Randee Jean Mcbride

Graduate Theses and Dissertations

Quantum dots are a valuable tool in many research applications and commercial development. Their applications are far reaching and as such have become a topic of great interest. One of their greatest assets is the ability to utilize them as water soluble fluorescent labels. Rendering the nanocrystals water soluble can be accomplished in several ways, but one very popular method is by capping them with water-soluble multi-functional organic ligands. However, these ligands, when attached to the quantum dot surface, are labile and can be exchanged which can be problematic when using the quantum dots in research applications. This projects investigates …

Grass Finishing Systems For Lambs, Erin Leigh Smyth

Graduate Theses and Dissertations

There is strong interest in sustainably produced meat. Grass-fed lamb could fulfill this market by reducing off-farm inputs. The objective was to examine the effect of grass-finishing or minimal supplementation on performance of lambs in the southeastern US. Katahdin lambs born in October 2013 and 2014 and February 2014 were weaned in January 2014/2015 and May 2014, respectively. Lambs were blocked by gender (fall; winter included only ram lambs) and randomly assigned to receive no (NON) or grain co-product supplement (SUP; 15% CP) at 0.5% of BW/d. Lambs were rotationally grazed on predominantly grass. Body weight, fecal egg counts (FEC), …

Spatiotemporal Fluctuations Of Olfactory Stimuli And Its Detection By An Optical Method, Mitu Chandra Acharjee

Graduate Theses and Dissertations

Olfactory processing in the mammalian brain is a highly dynamic process, yet most of the olfaction experiments have been studied primarily with static stimuli. Odors in the natural environment are transported by turbulent flow of air or water. Natural odorants have fluctuations in concentration and it changes rapidly with time. These rapid fluctuations may pose some challenges to identifying an odor; on the other hand, the variation itself may provide important clues about the odor source. The goal of this thesis project was to create a similar odorant environment like the rapid odor fluctuations encountered in nature – to meet …

The Effects Of Alcohol On The Interpretation Of Social And Emotional Cues: A Field Study Of College Student Drinking, Emotion Recognition, And Perceptions Of A Hypothetical Sexual Assault, Alexander James Melkonian

Graduate Theses and Dissertations

Alcohol use and abuse among emerging adults is highly correlated with increased risk for sexual victimization. Alcohol myopia theory has been used to explain impairments in Social information processing resulting in decreased attention to environmental Social cues including risk factors for sexual assault as well as facial emotional recognition. Those with deficits in Social information processing may be at particular risk for the misperception of salient risk factors for sexual assault by victims, perpetrators, and bystanders when intoxicated. In this naturalistic field study, participants who had been consuming alcohol were recruited to engage in tasks of facial emotion recognition and …

The Comparative Effects Of Hot Yoga And Thermoneutral Yoga On Flexibility, Heart Rate, Sweat Rate, And Mood, Hannah Kirkland Campbell

Graduate Theses and Dissertations

Yoga is an ancient Indian philosophy, described as a therapeutic intervention and health maintenance practice that unites the mind and body to aid healing through the combination of physical postures, breathing techniques, and meditation. There is ample research regarding yoga practiced in an environment that is thermoneutral, or in an environment that does not alter the metabolic heat production or evaporative heat loss of people. However, minimal research exists on the increasingly popular form of yoga known as hot yoga, or yoga practiced in an environment that is often humidified and 95° F or warmer. This exploratory study compared the …

Principals' Perceptions Of Technology Implementation In High Schools And Their Effects On Leadership, Mary Valerie Perkins-Jacobs

Graduate Theses and Dissertations

School administrators who are able to implement technology in their schools must see themselves as technology leaders; they are enthusiastic when it comes to using technology in professional development. This research study investigated how high school principals’ attitudes and perceptions of effectively organizing, utilizing, and implementing technology in order to support the mission and vision of the school by using the National Educational Technology Standards for Administrators (NETS-A) and Performance Indicators for Administrators (ISTE/NETS-A). For school administrators to provide effective leadership in their schools in the 21st century, they must possess knowledge and understanding of the issues and the capabilities …

A Cradle To Farm Gate Life Cycle Analysis Of Land Use In U.S. Pork Production, William Benjamin Putman

Graduate Theses and Dissertations

The goal of this study was to conduct a detailed Life Cycle Assessment (LCA) of the U.S. live swine production supply chain to quantify land use requirements and to assess the impact associated with various ration compositions. The functional unit was defined as one kilogram (2.2 pounds) of live swine at the farm gate, ready for transport to the abattoir. This assessment focused on the three highest producing USDA regions, which encompassed the Midwest (Regions 5 and 7) and the Southeast (Region 4), representing 86% of U.S. market hog production.

First, a literature review was conducted to summarize the most …

Three Essays On The Economics Of Foreign Aid, Hongwei Song

Graduate Theses and Dissertations

Recent years have seen a burgeoning interest in the issue of foreign aid especially in the context of developmental economics. As foreign aid is designed to help those less-privileged nations with developmental objectives such as poverty reduction and/or economic growth, fundamental questions include whether aid has been effective and what motivates donors to provide aid. This dissertation is composed of three essays that examine different issues concerning foreign aid. First, I focus on the Millennium Development Goals (MDGs) and its impact on aid allocation among sectors. If specification of the MDGs affected aid flows, it should be observed that more …

Volkswagen And Volkswagen: The Concept, The Car And The Company In Four Germanies And The United States, Stuart Treavor Bailey

Graduate Theses and Dissertations

This thesis explores the changing cultural meanings that the Volkswagen took in Germany in an attempt to understand the cultural exchange between the United States and Germany. In sum, it establishes that the car takes a distinct cultural form in the two countries governed by unique and particular historical developments. Over the last decade researchers working with car cultures have realized the long standing error of taking American values associated with the car as a normative marker of global car cultures, yet no one has suggested a working methodology to ensure that non-normative meanings are captured in analysis. I suggest …

A Light In Darkness, Oscar Micheaux: Entrepreneur Intellectual Agitator, Airic Hughes

Graduate Theses and Dissertations

Oscar Micheaux was a luminary who served as an agent of racial uplift, with a unique message to share with the world on behalf of the culturally marginalized African Americans. He produced projects that conveyed the complexity of the true black experience with passion and creative courage. His films empowered black audiences and challenged conventional stereotypes of black culture and potential. The legacy of Oscar Micheaux is historically unparalleled among his contemporaries. He transcended traditionally held perspectives about what black people could accomplish. The consciousness within his work still heavily influences black entertainment today. This study seeks to add to …

Numerical Simulation Of Terahertz Wave Interaction With Breast Cancer Tumor Tissue Sections, Abayomi Omotola Omolewu

Graduate Theses and Dissertations

This thesis presents numerical simulation of terahertz (THz) wave interaction with breast cancer tumor tissue sections. The obtained results are expressed in THz images of heterogeneous material that mimics the excised breast cancer tissue sections. The finite-element software package ANSYS High Frequency Structural Simulator (HFSS) was used in this work. HFSS is a full wave frequency domain three-dimensional (3D) electromagnetic simulation package. In this work, four breast cancer tissue models based on pathology images were simulated and images of the models were obtained at 1 THz. An incident Gaussian beam was raster scanned over tissue model configurations and the reflected …

Alliaria Petiolata (M.Bieb.) Cavara & Grande [Brassicaceae], An Invasive Herb In The Southern Ozark Plateaus: A Comparison Of Species Composition And Richness, Soil Properties, And Earthworm Composition And Biomass In Invaded Versus Non-Invaded Sites, Jennifer D. Ogle

Graduate Theses and Dissertations

Invasive species are widely recognized as organisms that severely alter ecosystem processes in the habitats to which they are introduced. Alliaria petiolata is one of the most important invasive plants in forests of the northern United States. This study examined the geographic distribution of the plant in the southern Ozarks, as well as the effect that it may be having on natural processes within forests of the region by comparing plant species richness, plant cover, and soil properties in invaded and non-invaded plots. It was found that A. petiolata is not significantly altering species richness, cover, or soil properties in …

The Determinants And Consequences Of Disclosure Committee Adoption, Lyle Roy Schmardebeck

Graduate Theses and Dissertations

After the passage of the Sarbanes-Oxley Act of 2002, the Securities and Exchange Commission recommended that companies voluntarily adopt disclosure committees to aid in preparing company disclosures. In this paper, I investigate the determinants and consequences of disclosure committee adoption. I find that companies with material weaknesses in internal controls over financial reporting and less readable 10-K filings are more likely to adopt disclosure committees. In consequences analyses, using a propensity score matched control sample and a difference-in-differences research design, I find that 10-K filings are longer and less readable after disclosure committee adoption. However, consistent with institutional theory, I …

Void: For Orchestra, Jared Aragon

Graduate Theses and Dissertations

In astronomy, a void is an area in outer space which contains no galaxies. These are vast expanses of darkness and emptiness. This orchestral piece, simply titled void, attempts to describe such an area through various musical methods: long sustained notes depicting the huge distances away from galaxies, wide distances between upper voices and lower voices creating a sense of void between musical elements, and close distances and tight harmonies to recreate the sense of confusion and uncertainty that may be experienced in an area of emptiness.

Design, Fabrication, And Measurement Of A Multiple-Input Multiple-Output (Mimo) Antenna For Mobile Communication, Christopher Charles Arnold

Graduate Theses and Dissertations

This thesis presents the design, fabrication and characterization of a multiband uniplanar MIMO antenna for hand-held mobile communication devices on LTE, WLAN, and WMAN networks. The antenna design methodology combined a variety of broadbanding techniques that resulted in a single-layer hybrid monopole antenna coupled to a meander line element and parasitic structures. The 115×55×1.54 mm antenna was fabricated using an FR4 composite material and occupies only a fractional volume within the size of an average cellular phone allowing ample space to integrate with existing hardware. Characterization of the MIMO antenna included input impedance, scattering parameters and radiation pattern cross sections …

Students' Perspectives After Participation In A Mandated College Level Alcohol Intervention Program: A Phenomenological Study, Suzanna L. Guizar

Graduate Theses and Dissertations

Alcohol abuse among college students continues to be a significant problem by which the consequences impact the student, their peers, and the university. Although quantitative research with volunteer participants supports the use of enhanced brief motivational interventions and cognitive behavioral skills training in reducing risky drinking behavior (binge drinking), research with mandated students has shown inconsistent findings. The current study is a phenomenological qualitative study exploring the students’ perspectives after attending a mandated college-level alcohol intervention program. Mandated students are students who have been referred to an alcohol intervention as a result of violating an alcohol related policy on campus. …

Teacher Perceptions Of Factors Influencing Their Self-Efficacy With Using One-To-One Technology During Literacy Instruction, Michael Todd Methvin

Graduate Theses and Dissertations

Teacher perceptions of factors that influence their own self-efficacy with using one-to-one technology during literacy instruction were examined through a multi-site, multi-subject case study. An initial survey was administered to determine the self-efficacy level of a group of participants from a school district that was implementing a one-to-one technology initiative. From this initial data set, four participants with varying levels of self-efficacy were invited to participate in the second, qualitative, phase of the data collection process to better understand factors they perceived to influence these levels. Results revealed that teachers perceived their self-efficacy of one-to-one technology use during literacy instruction …

The Technological Singularity: An Ideological Critique, Phillip Stephens

Graduate Theses and Dissertations

The Technological Singularity represents a confluence of techno-cultural narratives of progress in which the projected exponential growth of artificial intelligence and nanotechnology will usher in a moment of irrevocable change for the human race – a change that many claim is scant decades away. Although the concept saw its modern clarification by science fiction author Vernor Vinge, the Singularity sits astride both fictional and nonfictional narratives of the future. It is the aim of this study to explore the ideological discourses that emerge from texts on the Singularity and the unfathomable posthuman future it ushers in. Doing so reveals how …