Digital Commons Network^™

The Reliability And Validity Of The 30-15 Intermittent Field Test With A Ball, Kathleen Paulsen

Graduate Theses and Dissertations

The purpose of this study was to determine the reliability and validity of the 30-15 Intermittent Field Test (30-15IFT) with and without a ball and to determine differences across these two methods in female soccer players. Twenty-four collegiate female soccer players participated in this study (19.46 ± 1.22 years; 167.01 ± 7.23 cm; 60.95 ± 7.84 kg). Players performed one trial of the Yo-Yo Intermittent Recovery (YYIR) test, three trials of the 30-15IFT, and three trials of the 30-15IFT with a ball (30-15IFT-B), separated by a minimum of 48 hours. Maximal intermittent running velocity (VIFT), heart rate at exhaustion (HRpeak), …

Comparative Geochemical Analysis Of Ordovician And Mississippian Cherts In Relation To The Northern Arkansas And The Tri-State Mississippi Valley-Type Ore Districts, Jonathan T. Chick

Graduate Theses and Dissertations

It has been hypothesized that Ordovician, Mississippian, and younger carbonate and clastic formations found within the Ouachita Basin of west-central Arkansas and northward onto the Ozark Dome have experienced interaction with hydrothermal fluids due to tectonic forces produced by the Ouachita Orogeny. Lead (Pb) isotope analyses and resulting values produced through previous and concurrent geochemical studies of several formations indicate that the Mississippi Valley-type (MVT) ores were produced from a mixing and cooling of these sedimentary basinal brines by meteoric or connate waters. Reduction of sulfate to sulfide is one of the possible mechanisms by which MVT ore precipitation may …

Development Of Arkansas Net Energy Equation, Katie Hilton

Graduate Theses and Dissertations

The modern broiler is growing at a rapid rate generating tremendous amounts of heat. A sensitive Net Energy (NE) system is needed to measure body heat production (HP) generated primarily by daily maintenance and synthesis and degradation of myofibrillar and sarcoplasmic protein. The first two chapters present evaluation of the classic way to calculate NE versus a new methodology; the Arkansas NE (Ark NE) system, with birds from two genetic lines fed diets with different AA content or different ME content in two different environmental temperatures.

Utilizing together the Net Energy maintenance (NEm), determined from indirect calorimetry, and Net Energy …

Design Of Submicron Structured Guided-Mode-Resonance Near-Infrared Polarizer, Marzia Zaman

Graduate Theses and Dissertations

The objective of this research is to design a larger submicron linear polarizer in the near-infrared wavelength range with a wide bandwidth which can be fabricated using the conventional thin-film microfabrication technology to reduce cost. For this purpose, a gold (Au) wire-grid transmission-type transverse-magnetic (TM) polarizer and a silicon (Si) wire-grid reflection-type TM polarizer, were designed using the guided-mode-resonance filter. The Au wire-grid TM polarizer of 700nm grating width and 1200nm grating period has 95% transmittance at 2400nm, more than 1000nm resonance peak bandwidth, and an extinction ratio (ER) of around 300 with a moderated level of sidebands. The 700nm …

Calling Out The Trolls: Responses To Witnessing Use Of The “Troll” Label As A Defense In An Online Group Context, Dene E. M. Wamsley

Graduate Theses and Dissertations

Although the term “troll” has existed since the 1980s, its meaning has shifted in recent years as social media use has increased. People provide contrasting and imprecise definitions for what constitutes “trolling,” and often apply the term subjectively to describe online discussants who are uncivil, who are deviant, and who and present counter-attitudinal opinions. Exposure to deviance, counter-attitudinal information, and incivility often leads to unwanted psychological effects. In theory, labeling an uncivil, counter-attitudinal deviant as a “troll” proposes that their intention is to disrupt the conversation and upset other discussants, which provides a reason for why incivility is used, and …

Food Safety Risk In An Indoor Microgreen Cultivation System, Gina Marie Misra

Graduate Theses and Dissertations

Microgreens are immature sprouts of edible plants, sharing some similarities with sprouted seeds and petite leafy greens. Since they are most often grown in containers in buildings or greenhouses, they present a new area for food safety research at the intersection of the built environment and produce farming. Contamination by human pathogens has been extensively studied in other types of produce typically eaten raw, including sprouted seeds, which have been implicated in numerous outbreaks of salmonellosis over the last several decades. There is a paucity of knowledge about the microgreen sector of the fresh-cut industry; thus, it was determined that …

Improvement Of Geometric Quality Inspection And Process Efficiency In Additive Manufacturing, Yu Jin

Graduate Theses and Dissertations

Additive manufacturing (AM) has been known for its ability of producing complex geometries in flexible production environments. In recent decades, it has attracted increasing attention and interest of different industrial sectors. However, there are still some technical challenges hindering the wide application of AM. One major barrier is the limited dimensional accuracy of AM produced parts, especially for industrial sectors such as aerospace and biomedical engineering, where high geometric accuracy is required. Nevertheless, traditional quality inspection techniques might not perform well due to the complexity and flexibility of AM fabricated parts. Another issue, which is brought up from the growing …

Cloning, Protein Expression, And Characterization Of Interleukin 1 Alpha, Musaab Habeeb Ali Al Ameer

Graduate Theses and Dissertations

Recombinant DNA technology and the ability to produce recombinant proteins have significantly changed the world of pharmaceutical market. Recombinant DNA technology using E. coli cells has successfully produced many therapeutic proteins. In this study, the designed tag Ark-RUBY-tag facilitates rapid, and reproducible purification of recombinant proteins expressed as inclusion bodies in E. coli cells. Purification of Ark-RUBY-fused recombinant protein(s) can be obtained by using imidazole fractions. Target protein can be easily removed from the Ark-RUBY-tag by enzymatic cleavage. Ark-RUBY-fused recombinant proteins can be quantitatively detected using polyclonal antibodies. Ark-RUBY-tag can be used to purify small peptides. By using Ark-RUBY-tag, purified …

Asymmetric Exchange Rate Pass-Through In Southeast Asian Rice Trade, Taylor Wiseman

Graduate Theses and Dissertations

Asian countries consume approximately 90% of the world’s rice supply. Between 2007 and 2014, Thailand, Vietnam, and India accounted for 60% of the world’s exports of rice. This paper estimates the impact of exchange rate fluctuations on bilateral trade flows in Southeast Asia. Because most Southeast Asian countries have state trading enterprises or agencies controlling rice trade, this analysis will provide insight as to whether these agencies respond to exchange rate fluctuations in a manner consistent with economic theory. Behavior inconsistent with economic theory could provide evidence of stabilizing domestic prices, market power, or export expansion policies. The analysis focuses …

An Exploration Of The Experiences Of Faculty With Disabilities In A Research University In The South, Gonzalo Camp

Graduate Theses and Dissertations

While diversity and inclusion has become a benchmark for universities all around the country, faculty with disabilities remain in the margins of higher education discourse and are a neglected population across the spectrum of academia. This thesis aims at exploring the experiences of faculty with disabilities at a specific research 1 university in the South. Semi-structured interviews were conducted with five faculty members who self-identify as having a disability. Four themes emerged from this study: able-bodied lens, fear, social isolation, and coping mechanisms. Building on the existing literature, these findings offer new information to expand the knowledge on the challenges …

Lay Latitude: Latter-Day Saint Women's Agency In Northwest Arkansas, Andrew Tompkins

Graduate Theses and Dissertations

The question of women’s agency in gender-traditional religions has been the subject of much scholarly attention over the past four decades, but little research has been done focusing specifically on Latter-day Saint women and their identities and roles within the structure and practice of the Church. In popular media representations, Latter-Day Saint women are often depicted as submissive or surviving, either powerless pawns or resistant warriors. However, many Latter-day Saint women find fulfillment and empowerment within and because of, rather than outside or in spite of, the institutional Church. In this thesis, I explore women’s agency in Northwest Arkansas’ Greendale …

An Isotopic Assessment Of Late Prehistoric Interregional Warfare In The Southcentral Us, John R. Samuelsen

Graduate Theses and Dissertations

Skull burials are found all over the world. The cause of such ancient Native Americans deposits often lead to disagreement among scholars torn between warfare and ancestor veneration. One skull-and-mandible deposit, representing at least 352 people (A.D. 1253-1399), was uncovered at the Crenshaw site, a multiple-mound Caddo ceremonial center in southwest Arkansas. Most previous research suggested they were victims of interregional warfare from the Southern Plains or Mississippi Valley. One previous study hypothesized that this was a Caddo burial practice which expanded during the Middle Caddo period (A.D. 1200-1500) due to the adoption of maize as a staple and a …

Detection Of Woody Breast Condition In Broiler Carcasses And Product Utilization In Further Processing, Juan Pablo Caldas Cueva

Graduate Theses and Dissertations

Woody Breast (WB) myopathy causes significant economic losses to the global poultry industry and the lack of objective, non-invasive and rapid methods for its detection as well as profitable alternatives for its utilization are contributing factors. This dissertation is divided into two main areas. The first area aimed to determine if there are carcass conformation changes that can be used to identify WB characteristics in commercial broilers using image analysis. In the first experiment, images of broiler carcasses were captured before evisceration to obtain and evaluate carcass measurements from the breast region. Eight image measurements and four ratios were used …

Perceptual Characterization: On Perceptual Learning And Perspectival Sedimentation, Anthony Holdier

Graduate Theses and Dissertations

In her analysis of perspectival effects on perception, Susanna Siegel has argued that perceptual experience is directly rationally assessable and can thereby justify perceptual beliefs, save for in cases of epistemic downgrade or perceptual hijacking; I contend that the recalcitrance of known illusions poses an insurmountable problem for Siegel’s thesis. In its place, I argue that a model of perceptual learning informed by the dual-aspect framework of base-level cognitive architecture proposed by Elisabeth Camp successfully answers the questions motivating Siegel’s project in a manner that avoids such issues.

Arkansas Aprons: Food Power And Women In Arkansas, 1857 To 1891, Robyn Shahan Spears

Graduate Theses and Dissertations

Arkansas foodways in the late nineteenth century were defined by times of plenty and scarcity, need and connection, traditions and innovations. These components created a unique culture in which women through food exchange, were able to improve their standard of living. The years of plenty established in the antebellum era lay in stark contrast to the scarcity during the Civil War. What followed during the Progressive Era are fascinating histories of women employing their agency to empower and improve not only their lives but also future generations. I argue that these women utilized their agency to engage in “food power,” …

The Impact Of Social Media On The Social Lives Of People With Visual Impairment (Facebook Groups As A Case Study), Itto Outini

Graduate Theses and Dissertations

This present research seeks to provide a more comprehensive understanding of why people with visual impairment use social media. I investigate this question using uses and gratification (U&G) Theory, which was developed by Katz, Blumler, & Gurevitch (1974). The theory explains what people do with media and why. The purpose of this study is twofold: it seeks to document reasons people with visual impairment use Facebook and it endeavors to reveal which variables can influence users’ decisions to use one social media platform instead of another. In particular, I am interested in determining factors motivating users with visual impairment to …

How Does Disproportionality In Discipline Manifest In Rural Schools In Southeast Arkansas?, Julie Workman

Graduate Theses and Dissertations

African American students are disciplined in schools at disproportionately higher rates than White students. This trend was first reported in 1975 in a report by the Children’s Defense Fund and since that time, has been highly studied. However, most research has been conducted in urban or suburban schools, with less known about disproportionate discipline in rural schools. This study utilized an explanatory sequential mixed methods approach to explore disproportionate discipline between African American and White students in five rural schools located in Southeast Arkansas. The research questions were as follows: (1) How is discipline disproportionality perceived in specific rural schools …

Design And Simulation Of Power Electronics Modules, Haonan Jia

Graduate Theses and Dissertations

Silicon carbide (SiC), a wide-bandgap semiconductor material, greatly improves the performance of power semiconductor devices. Its electrical characteristics have a positive impact on the size, efficiency, and weight of the power electronics systems. Parasitic circuit elements and thermal properties are critical to the power electronics module design. This thesis investigates the various aspects of layout design, electrical simulation, thermal simulation, and peripheral design of SiC power electronic modules. ANSYS simulator was used to design and simulate the power electronic modules. The parasitic circuit elements of the power module were obtained from the device parameters given in the datasheet of these …

Instagram And Eating Disorders: An Empirical Study Of The Effects Of Instagram On Disordered Eating Habits Among Young Girls, Katherine Wayles

Graduate Theses and Dissertations

Scholars have studied the relationship between body dissatisfaction and social media use, particularly focusing on young women as vulnerable consumers. Many studies concentrate on the amount of media consumed, rather than the specific activities and behaviors associated with feelings of low self-esteem or poor body image. It is important to determine exactly what behaviors and social media engagements contribute to disordered relationships with food, assessing a user’s pre-existing weight/body concerns in relation to the amount and type of media they consume. Instagram in particular is included in this study, as it is an image-based social networking site where users can …

A Novel Three-Level Isolated Ac-Dc Pfc Power Converter Topology With Reduced Number Of Switches, Obaid Aldosari

Graduate Theses and Dissertations

The three-level isolated AC-DC power factor corrected (PFC) converter provides safe and more efficient power conversion. In comparison with two-level, three-level PFC converter has the advantages of low total harmonic distortion, low device voltage rating, low di/dt, better output performance, high power factor, and low switching losses at higher switching frequencies. The high frequency transformer (HFT) grants galvanic isolation, steps up or down secondary voltage, and limits damage in case of a fault current.

The existing three-level converter based on solid-state transformer (SST) topologies convert ac power from the electrical grid to a dc load while maintaining at least the …

Integrated Hyperspectral And Geochemical Analysis Of The Upper Mississippian Meramec Stack Play And Outcrop Equivalents, Anadarko Basin And Ozark Uplift, Oklahoma, David Gates

Graduate Theses and Dissertations

The principle goal of this project was to investigate compositional, textural, and sedimentological variability in the Oklahoma STACK Play’s Meramec Formation and time equivalent outcrops of the Pryor Creek Formation in northeastern Oklahoma and to assess the potential of a partial-SWIR (Short Wave Infrared, 900-1700 nm) hyperspectral imaging sensor for drill core and sUAS-based (small Unmanned Aircraft Systems) outcrop characterization.

The STACK Play is a colloquial term that refers to stacked unconventional petroleum reservoirs that are primarily located in Canadian, Kingfisher, Blaine, and Dewey Counties, central Oklahoma. Discovery of, and commercial production from, the play was initiated in 2011 by …

Practitioner Use Of And Attitudes Toward Video-Conferencing For The Delivery Of Evidence-Based Telemental Health Interventions, Kathryn Parisi

Graduate Theses and Dissertations

Compared to telehealth delivery of interventions for physical health issues, the implementation of evidence-based psychosocial interventions using technology has less support. Video-conference delivery (VCD) has the potential to increase accessibility to effective treatments, although its use remains limited and understudied. This study employed a mixed methods approach in surveying mental health practitioners about their attitudes regarding the use of video-conference methods to deliver evidence-based interventions. One hundred and eleven practitioners were sampled from several national and regional practice organizations and administered quantitative surveys about their use of and attitudes towards VCD of evidence-based interventions. The relationship between clinician-level technology access, …

Effects Of Parental Migration On Education And Personality: Evidence From Indonesia, Kyle Sullivan

Graduate Theses and Dissertations

In developing countries, migration can be an important method for many families and households to produce additional income via remittances in order to meet their needs or invest in their children. However, migration is a dynamic process and the absence of a parent can have negative effects on those children left behind. This paper explores how parental migration is associated with their children’s years of education completed and how these associations are heterogenous by family compositions in Indonesia. I use a longitudinal dataset which allows for parents’ migrations to be attributed throughout an individual’s childhood to measure the cumulative impact. …

Sex, Stress, And The Supreme Court: Verbal And Vocalic Analysis Of Brett Kavanaugh’S Senate Confirmation Hearings To The Supreme Court, Alexandra Johnson

Graduate Theses and Dissertations

This study analyzed the relationship between verbal and nonverbal vocalic communication patterns exhibited by Brett Kavanaugh, now a sitting Justice on the U.S. Supreme Court, during his Senate confirmation hearings in 2018. Additionally, the relationship between verbal statement types: attempt to define reality, personal narrative, policy positions, attacks, acclaims, and defenses, and the nonverbal vocalics of sighs, sharp intakes of breath, and sniffs were evaluated together to see which statement types would elicit higher physiological stress responses during both the 16-minute speech given at the end of the Day One hearing and the 45-minute testimony during the sexual assault hearing. …

Effects Of Lasalocid And Energy Supplementation On Forage Intake, Energy Metabolism, And Performance Of Cattle Grazing Wheat Pasture, Autumn Tayler Pickett

Graduate Theses and Dissertations

Cattle grazing wheat pasture have the potential to gain BW exceptionally well, but excessive nitrogen intake results in increased excretion and increased greenhouse gas (GHG) emissions. Supplemental concentrates with the addition of an ionophore given to ruminants grazing wheat is a potential practice for producers to increase nitrogen efficiency while decreasing GHG emissions. Therefore, the objective of this experiment was to quantify the effects of energy (2.95 kg/d) and lasalocid (200 mg/hd/d) supplementation on nutrient intake, energy metabolism, respiratory gas fluxes, and performance of grazing cattle. Methane emissions were not affected (P = 0.58) by treatment, hence methane intensity (P …

Elucidating Basis Of Rice Discoloration And Developing Prevention Strategies, Zeinab Mohammadi Shad

Graduate Theses and Dissertations

Economically, discolored rice kernels have less market value, which can seriously impact farm net profit. The reasons for rice discoloration during storage have not been studied extensively and many questions remain. Therefore, the primary goal of this study was to improve understanding of the role and contributions of storage practices on rice quality degradation and discoloration. In this study, three rice cultivars including XL753 (hybrid), Roy J (pureline), and Titan were assessed for changes in quality and microbial kinetics. The rice samples at a high moisture content (MC) of 21% w.b. and a low MC of 16% were stored at …

Empire Rules: Cultures Of U.S. Imperialism In Multi-Ethnic Literature Of The U.S., Luis Paganelli Marin

Graduate Theses and Dissertations

This dissertation concerns contemporary multi-ethnic literature of the U.S. (MELUS) and empire. Namely, contemporary MELUS invites a reckoning with U.S. Empire, an amalgamation of settler colonialism, imperialism, and capitalism, which works through ahistorical and transhistorical cultural narratives. In turn, contemporary multi-ethnic writers uncover our obscured colonial and imperial histories and legacies that racialize, criminalize, and otherize people of color in the U.S within our present moment. This dissertation, then, analyzes recent novels and poetry collections by African American, Native American, Latinx, and African diasporic writers to unmask the efforts of empire-building with the material effects on colonized, marginalized peoples. Reckoning …

Incorporating Geophysical Data In Slope Stability Modeling For Two Slopes In Arkansas, Vanessa Lebow

Graduate Theses and Dissertations

Slope failures in the United States alone cause millions of dollars in damage to infrastructure, threaten national monuments, create environmental hazards, and take an average of 25-50 lives a year. With the inevitable construction that occurs on slopes, it is imperative that the slopes be properly designed which requires a thorough understanding of slope grade, subsurface soil conditions, soil strength parameters, water table locations, and depth to bedrock across the entire site. The preferred method of data collection would be to use borings and other in-situ methods; however, sometimes due to cost constraints or site accessibility only a very limited …

Evaluation Of Concrete Deck Curing Regimens Using Capillary Pressure Sensing System, Samuel Spann

Graduate Theses and Dissertations

Early-age plastic shrinkage cracking is a common problem with the construction of concrete bridge decks due to the high surface area-to-volume ratio and exposure to potentially detrimental environmental effects. Curing regimens are utilized to mitigate cracking risk during the plastic stage of the concrete; the curing regimens evaluated for this study were wet burlap-polyethylene sheeting, two acrylic curing compounds, and one lithium compound. Capillary pressure in the water filled pores has been shown to correlate to the plastic shrinkage cracking risk of concrete. A new portable system has been developed to measure the capillary pressure that could potentially be used …

Study Of Internal Strains Developed In Concrete Decks At Early Ages In Steel Continuous Bridges, Fernando R. Benitez Ortiz

Graduate Theses and Dissertations

The Arkansas Department of Transportation (ARDOT) has identified bridge deck cracking shortly after concrete decks are placed and prior to applying traffic loads. Previous researchers have confirmed improper construction practices and design methods can lead to deck cracking. Currently, many contractors throughout Arkansas are using continuous deck pours. This construction approach may restrict the concrete slab from movement during early age shrinkage, causing tensile stresses to develop. The final stresses at the end of construction must be lower than the concrete tensile strength, if not cracking issues will develop. Eventually, these cracks may enlarge due to service load stresses and …