Digital Commons Network^™

Give Up The Ghost, Hannah T. Mcbroom

Graduate Theses and Dissertations

Give Up the Ghost is a series of six paintings created in Fall 2018 and Spring 2019. The paintings are an introspective examination of transgender subjectivity in visual narrative.

In this paper, I separate the personal and research through first and third person, similarly to how I separate imagery and mark making in my paintings. The paper is broken up into a description of the project, the history and theory which informs the work, and why painting is used to describe bodies and spaces.

Give Up the Ghost refers to giving up social expectations as determined by gender. The paintings …

Good Dyke Art, Sam M. Mack

Graduate Theses and Dissertations

The work in good dyke art visually expands upon conversations about institutional critique and its contradictions, specifically questioning who dictates the boundaries between institutions and bodies: how divisions are made between them and who enacts or receives force. One’s participation in this critique, however, indicates a participation in the problematics of the institution and by extension, a desire to critique may also be considered a desire to participate in that system.

Ceramic, glaze, and found objects manifest an allegorical formalism that utilizes coded languages of institutional spaces, traditions of queer-coding, and charged word-play. The ceramic vessel forms reference the Ancient …

Factors Influencing The Spatial Distribution Of Southern Rust In Corn, Justin Bailey

Graduate Theses and Dissertations

Southern rust caused by the fungus Puccinia polysora (Underwood) is the most economically important foliar disease in corn (Zea mays) (Linnaeus) (Cyperales: Poaceae)) for Arkansas. The objective of this work was to determine distribution of southern rust in corn and to determine factors that may control its distribution.

During the 2017 and 2018 season, seven corn fields in Arkansas were rated for southern rust. After disease confirmation, fields were marked with GPS sample point locations in a grid pattern across the entire field. Ratings for disease severity were taken below, at, and above the ear leaf at each point every …

Predicting The Mechanical Properties Of Nanocomposites Reinforced With 1-D, 2-D And 3-D Nanomaterials, Scott Edward Muller

Graduate Theses and Dissertations

Materials with features at the nanoscale can provide unique mechanical properties and increased functionality when included as part of a nanocomposite. This dissertation utilizes computational methods at multiple scales, including molecular dynamics (MD) and density functional theory (DFT), and the coupled atomistic and discrete dislocation multiscale method (CADD), to predict the mechanical properties of nanocomposites possessing nanomaterials that are either 1-D (carbyne chains), 2-D (graphene sheets), or 3-D (Al/amorphous-Si core-shell nanorod).

The MD method is used to model Ni-graphene nanocomposites. The strength of a Ni-graphene nanocomposite is found to improve by increasing the gap between the graphene sheet and a …

Fault Adaptive Workload Allocation For Complex Manufacturing Systems, Charlie B. Destefano

Graduate Theses and Dissertations

This research proposes novel fault adaptive workload allocation (FAWA) strategies for the health management of complex manufacturing systems. The primary goal of these strategies is to minimize maintenance costs and maximize production by strategically controlling when and where failures occur through condition-based workload allocation.

For complex systems that are capable of performing tasks a variety of different ways, such as an industrial robot arm that can move between locations using different joint angle configurations and path trajectories, each option, i.e. mission plan, will result in different degradation rates and life-expectancies. Consequently, this can make it difficult to predict when a …

The Role Of Inter-Particle Behavior In Iron Oxide Nanoparticle Induction Heating, Hayden Seth Carlton

Graduate Theses and Dissertations

Due to their multi-functional nature, iron oxide nanoparticles present themselves in a myriad of scientific disciplines, but perhaps the most interesting property of these nanomaterials can be seen in their immense thermal response under the influence of alternating magnetic fields. Currently popularized as an alternative cancer treatment through localized hyperthermia, iron oxide nanoparticle induction heating presents an interesting physical phenomenon that distinguishes itself from macroscopic induction heating. Understanding how a single spherical particle behaves is relatively simple and remains well documented; however, magnetic interactions of a single particle often extend over many length scales, affecting numerous neighboring particles in the …

Auto-Calibration Of Wim Using Traffic Stream Characteristics, Johnson Baker

Graduate Theses and Dissertations

This project evaluates the performance of Weigh-in-Motion (WIM) auto-calibration methods used by the Arkansas Department of Transportation (ARDOT). Typical auto-calibration algorithms compare the WIM measured weights of vehicles from the traffic stream to reference values, using five-axle tractor-trailer configured trucks for comparisons, e.g. Federal Highway Administration (FHWA) Class 9. Parameters of the existing algorithms including the Front Axle Weight (FAW) reference value, the sampling frequency required to update the calibration factor, and thresholds for Gross Vehicle Weight (GVW) bins were evaluated. The primary metric used to estimate algorithm performance was Mean Absolute Percent Error (MAPE) between the WIM and static …

Motor Control Systems Analysis, Design, And Optimization Strategies For A Lightweight Excavation Robot, Austin Jerold Crawford

Graduate Theses and Dissertations

This thesis entails motor control system analysis, design, and optimization for the University of Arkansas NASA Robotic Mining Competition robot. The open-loop system is to be modeled and simulated in order to achieve a desired rapid, yet smooth response to a change in input. The initial goal of this work is to find a repeatable, generalized step-by-step process that can be used to tune the gains of a PID controller for multiple different operating points. Then, sensors are to be modeled onto the robot within a feedback loop to develop an error signal and to make the control system self-corrective …

Costume Design For Qui Nguyen’S She Kills Monsters, Tanner Neal Mcalpin

Graduate Theses and Dissertations

The following thesis details the process of creating costume designs and implementing them in the production of She Kills Monsters which was produced at the University of Arkansas Black Box Theatre in the Fall of 2018. Throughout this thesis I will explain how the costumes went from initial research and conversations with the director to the final products on the stage. The account of this includes an analysis of the script, collages of photos used for inspiration, portrait gallery, research, rough sketches, renderings with fabric swatches, production photos, and my evaluation of the process as a whole.

“Because I Care I Risk”: How Ceo Free Market Orientation Affects The Extent And Type Of Income Smoothing, Mirzokhidjon S. Abdurakhmonov

Graduate Theses and Dissertations

The executive political ideology literature suffers from a lack of conceptual clarity because social and economic issues are conflated. This has created an inconsistency in empirical findings with the theoretical predictions of the political ideology construct. In this dissertation, I identify a distinct economic component, free market orientation, based on support for economic individualism, competition, and property rights to reconcile these inconsistencies. Specifically, I argue that these indicators of free market orientation will have a unique impact on the way executives run their organizations. I develop a novel scale that measures CEO economic values that I term free market orientation …

Expanding Outcomes In Educational Program Evaluation: Student Outcomes, Systemic Effects, And Policy Implications, Heidi Lauren Holmes

Graduate Theses and Dissertations

Education policy debates over the last twenty years have focused on the need to increase students’ test scores. The federal government and states have implemented and expanded a variety of test-based, school accountability policies. Accountability pressures have incentivized schools to narrow their curriculum, decrease time allocated to extracurricular activities, and focus on short-term student outcomes. This dissertation focuses on expanding outcomes in educational program evaluations and demonstrates the value of looking beyond the goal of increasing student test scores. The first chapter, using random assignment, estimates the causal effects of culturally enriching field trips on various student outcomes. Such field …

Validity And Reliability Of A 5-Minute Web-Camera Based Eye Tracking Test To Assess Visual Memory And Cognition, Emily Bates

Graduate Theses and Dissertations

There are approximately 5.7 million Americans currently living with Alzheimer’s Disease (AD). Early detection of cognitive impairment allows for earlier treatment, potentially slowing or halting cognitive decline. A 30-min web-camera eye tracking assessment (30-min VPC) has been validated as a tool to predict AD risk. However, a shorter version would allow for greater scalability and improve user experience. The purpose of this study was to: 1) determine the validity of the 5-minute web-camera based VPC test with the 30-min test, 2) determine the test-retest reliability of the 5-min test, 3) compare the 5-minute test scores of cognitively intact adults (18-39 …

Testing Measurement Invariance In Multilevel Data With Unequal Cross-Level Factor Structures, Lihua Yang

Graduate Theses and Dissertations

The test of measurement invariance (MI) investigates whether observed items measure a construct in the same way across different groups or over times. Examining MI is a prerequisite for multiple group comparisons in psychological tests (Schmitt & Kuljanin, 2008). With the prevalence of multilevel data in educational research (e.g., students nested within schools), establishing MI across multiple groups or waves of nested data has brought increasing attention. Two popular techniques for the test of multilevel MI include the multiple-group multilevel confirmatory factor analysis (MMCFA) and the design-based approaches. The MMCFA approach estimates sample covariance matrices at different levels separately. The …

Positioning Of English Language Learners And Its Power On Classroom Learning Opportunities And Interactions, Hawraa Nafea Hameed Alzouwain

Graduate Theses and Dissertations

In this qualitative study, the researcher investigated four aspects of positioning used by teacher and ESL students in a mid-south state of the United States. This study was based on the Positioning Theory of Davies and Harré (1990). The study aimed to explore various types of positioning used by the participants and how they impacted social interactions among the students and between them and their teacher. The researcher used four questions to outline the scope of the research, focused on: 1) how ELLs’ different positioning in the ESL classroom promoted or limited their learning opportunities; 2) how the ELL teacher …

Feedforward And Feedback Signals In The Olfactory System, Srimoy Chakraborty

Graduate Theses and Dissertations

The conglomeration of myriad activities in neural systems often results in prominent oscillations. The primary goal of the research presented in this thesis was to study effects of sensory stimulus on the olfactory system of rats, focusing on the olfactory bulb (OB) and the anterior piriform cortex (aPC). Extracellular electrophysiological measurements revealed distinct frequency bands of oscillations in OB and aPC. However, how these oscillatory fluctuations help the animal to process sensory input is not clearly understood. Here we show high frequency oscillations in olfactory bulb carry feedforward signals to anterior piriform cortex whereas feedback from the aPC is predominantly …

Reducing The Risk: Psychological And Technological Approaches For Improving Handwashing Practices In The Foodservice Industry, Jeffrey Allan Clark

Graduate Theses and Dissertations

As Americans are spending greater portions of their dollar on food consumed outside the home, the foodservice industry plays more of an integral part of daily existence compared to previous generations. Given the numerous annual foodborne illness outbreaks that threaten human lives while undermining confidence in the food supply, food safety is a pertinent issue for industry stakeholders, government regulators, and consumers. Food worker handwashing reduces the risk of foodborne illness transmission, yet compliance with this simple behavior is a complex problem. This dissertation addresses, predominantly, the issue of sub-optimal handwashing practices through applying psychology and technology, including wearable computers …

Feeling Clumsy, Feeling Alien: Gender And Affect In Victorian Sensation Fiction, Gracie Mae Bain

Graduate Theses and Dissertations

“Feeling Clumsy, Feeling Alien: Gender and Affect in Victorian Sensation Fiction” explores the interactions between the shock of reading sensation fiction and the affective potential of the genre using Sara Ahmed’s definition of the killjoy and the affect alien. The sensation genre, as explained in its name, is potentially useful when thinking about affective ties in the Victorian period. The first chapter, “Tracing Sensations: Finding and Following the Killjoy” explores the affective footwork that readers of sensation fiction are asked to perform in their sympathetic process with the female villains and fallen heroines. Affective tools employed by sensational fiction create …

Mental Health On Trial: An In-Depth Look At The Criminalization Of Mental Illness In The United States Criminal Justice System, Addison Elise Shemin

Graduate Theses and Dissertations

The criminal justice system was created to identify, incarcerate, and rehabilitate men and women that have broken the law. However, over two million people with mental illnesses are placed into jails every year. The lack of proper psychological evaluation and diagnosis coupled with misunderstood evidence and economic hardship has produced a system that treats these men and women as criminals rather than someone suffering from an illness. When an individual with mental health issues comes into contact with the criminal justice system they are often improperly evaluated by first responders, wrongfully convicted, and inappropriately sentenced. The lack of proper psychological …

Music, Language, And Rhythmic Timing, Rhimmon Simchy-Gross

Graduate Theses and Dissertations

Neural, perceptual, and cognitive oscillations synchronize with rhythmic events in both speech (Luo & Poeppel, 2007) and music (Snyder & Large, 2005). This synchronization decreases perceptual thresholds to temporally predictable events (Lawrance et al., 2014), improves task performance (Ellis & Jones, 2010), and enables speech intelligibility (Peelle & Davis, 2012). Despite implications of music-language transfer effects for improving language outcomes (Gordon et al., 2015), proposals that shared neural and cognitive resources underlie music and speech rhythm perception (e.g., Tierney & Kraus, 2014) are not yet substantiated. The present research aimed to explore this potential overlap by testing whether music-induced oscillations …

Familiarization Through Ambient Images Alone, Nia Imani Gipson

Graduate Theses and Dissertations

The term “ambient images” has begun to show up in much of the current literature on facial recognition. Ambient images refer to naturally occurring views of a face that captures the idiosyncratic ways in which a target face may vary (Ritchie & Burton, 2017). Much of the literature on ambient images have concluded that exposing people to ambient images of a target face can lead to improved facial recognition for that target face. Some studies have even suggested that familiarity is the result of increased exposure to ambient images of a target face (Burton, Kramer, Ritchie, & Jenkins, 2016). The …

Russian University Efl Students’ Perceptions Of A Two-Week Online Academic Writing Course, Nataliia Borozdina

Graduate Theses and Dissertations

This case study analyzes Russian university EFL students’ perceptions of a two-week online academic writing course. The researcher investigated 13 students’ attitudes towards an online academic English writing class offered at Kursk State University, Kursk’s oldest higher education institution, founded in 1934. In 1994 it was transformed into Kursk State Pedagogical University, and in 2003 it became Kursk State University. Along with the two-week online course assignments, the students completed pre- and post-questionnaires, reflections about the course, and participated in individual and group interviews. The findings of the study indicate that all of the participants had positive perceptions about the …

Model Development And Assessment Of The Gate Network In A High-Performance Sic Power Module, William Austin Curbow

Graduate Theses and Dissertations

The main objective of this effort is to determine points of weakness in the gate network of a high-performance SiC power module and to offer remedies to these issues to increase the overall performance, robustness, and reliability of the technology. In order to accomplish this goal, a highly accurate model of the gate network is developed through three methods of parameter extraction: calculation, simulation, and measurement. A SPICE model of the gate network is developed to analyze four electrical issues in a high-speed, SiC-based power module including the necessary internal gate resistance for damping under-voltage and over-voltage transients, the disparity …

Advanced Statistics In Arkansas Sports Reporting, Andrew Lee Epperson

Graduate Theses and Dissertations

This study seeks to analyze how Arkansas’ sports journalists are adapting to the recent surge in available advanced statistics that are being used by certain national news organizations. Using in-depth qualitative research that includes in-depth interviews with a number of individuals in the print, broadcast, and athletics side of sports coverage, we discover how journalists and coaches use these next-generation analytics, what they fundamentally mean for the evolution of each respective path, and why so few Arkansas reporters and writers use them at the time of this paper’s defense. We see how budgets and deadlines restrict the use of these …

Local And Central Controllers For Microgrids, Edgar Ariel Escala Calame

Graduate Theses and Dissertations

The main objective of this thesis is to serve as a guide, so readers are able to learn about microgrids and to design simple controllers for different AC microgrid applications. In addition, this thesis has the objective to provide examples of simulation cases for the hierarchical structure of a basic AC microgrid which can be used as a foundation to build upon, and achieve more complex microgrid structures as well as more sophisticated power-converter control techniques.

To achieve these objectives, the modeling of voltage source converters and control design in the z-domain are presented. Moreover, the implementation and transient analysis …

Evaluating The Effectiveness Of Motor Planning With Core Vocabulary: A Behavior Analytic Account, Alison Judith Karnes

Graduate Theses and Dissertations

As the prevalence of autism spectrum disorders (ASD) increases, it is important for practitioners to continue to improve evidence-based practices (EBP) for the treatment of ASD symptoms (i.e., impairments in social communication and repetitive behaviors and restricted interests; American Psychiatric Association [APA], 2013). It is estimated that 30-50% of individuals with autism do not acquire functional speech (Wodka, Mathy, & Kalb, 2013). These individuals would make appropriate candidates for Augmentative and Alternative Communication (AAC; Mirenda, 2003). One form of AAC is the speech-generating device (SGD). Over the last ten years, tablet-based technologies including iPad minisⓇ have been emphasized in the …

Comparing Elo, Glicko, Irt, And Bayesian Irt Statistical Models For Educational And Gaming Data, Breanna Morrison

Graduate Theses and Dissertations

Statistical models used for estimating skill or ability levels often vary by field, however their underlying mathematical models can be very similar. Differences in the underlying models can be due to the need to accommodate data with different underlying formats and structure. As the models from varying fields increase in complexity, their ability to be applied to different types of data may have the ability to increase. Models that are applied to educational or psychological data have advanced to accommodate a wide range of data formats, including increased estimation accuracy with sparsely populated data matrices. Conversely, the field of online …

Associate And Baccalaureate Degree Nursing Students’ Knowledge Of And Attitudes Toward Medication Errors And Reporting Medication Errors: Implications For Curriculum Development, Tabatha Diann Teal

Graduate Theses and Dissertations

This paper evaluates senior nursing students’ knowledge and attitudes of medication errors and reporting errors. This study was conducted to evaluate a need for improvements to nursing education on these two concepts. This mixed method study was conducted using a modified version of the Medication Administration Error Reporting Survey by Wakefield, Uden-Holman, and Wakefield (2005) and focus group sessions at four nursing programs in the Southern United States. Medication errors continue to be a threat to patient safety and underreporting exists due to the stigma surrounding admitting a mistake. Evaluating nursing students’ knowledge and attitudes on these concepts is a …

Large-Scale Atomistic Simulations Of Complex And Functional Properties Of Ferroic Materials, Raymond Thomas Walter

Graduate Theses and Dissertations

Ferroelectric (FE) nanostructures have attracted considerable attention as our abilities improve to synthesize them and to predict their properties by theoretical means. Depolarizing field effects at interfaces of FE heterostructures are particularly notable for causing topological defects such as FE vortices and negative dielectric responses in superlattices. In this thesis, I employ two large-scale atomistic techniques, the first-principles-based effective Hamiltonian (HEff) method and the linear-scaling three-dimensional fragment (LS3DF) method. I use these methods to explore optical rotation in FE vortices, electro-optic effects in FE vortices and skyrmions, and voltage amplification via negative capacitance in ferroelectric-paraelectric superlattices. We employ HEff in …

Investigation Of Critical Technologies Of Chemical Vapor Deposition For Advanced (Si)Gesn Materials, Joshua Matthew Grant

Graduate Theses and Dissertations

The development of new materials for efficient optoelectronic devices from Group IV elements is the heart of Group IV photonics. This has direct ties to modern technology as the foundation for the electronics industry is silicon. This has driven the development of silicon-based optoelectronics using these other Group IV materials as silicon is a poor optical material due to its indirect band gap when compared to the III-V semiconductors that are used by most of the optoelectronics industry. While efforts have been made to integrate III-V materials onto silicon substrates, the incompatibility with the complementary metal oxide semiconductor process has …

Evaluation Of Crop Tolerance And Weed Control In Corn And Grain Sorghum With Atrazine Replacements, Jacob Thomas Richburg

Graduate Theses and Dissertations

Atrazine is a foundational herbicide for weed control in both corn (Zea mays L.) and grain sorghum [Sorghum bicolor (L.) Moench] production. However, studies have shown that while atrazine may be an effective herbicide for preemergence and postemergence control of weeds, it also has risks. The low Koc of atrazine as well as its extensive use over the past 50 years have led it to become the most common groundwater contaminant near agricultural soils. Given these findings, atrazine has faced severe scrutiny while under consideration for reregistration. In the event that atrazine is not reregistered, corn and grain sorghum producers …