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Optimization Of A Dynamic Hot Water Pretreatment Of Switchgrass Using Catalysis By Carbonation To Maximize Carbochemical Yields, Rohit Tanaji Dhamdere

Graduate Theses and Dissertations

A bio-refinery is a facility that converts renewable bio-resources into value-added chemicals and products. In this context of a bio-refinery, the production of the carbochemicals such as HMF, furfural and organic acids illustrate that multiple products can be produced from a renewable source such as lignocellulosic biomass (switchgrass). Traditionally, carbochemicals such as furfural and HMF are produced using inorganic acids such as H2SO4, HCL, and H3PO4. The use of such acids requires the application of high cost materials of construction such as Hastelloy-C, titanium etc.

The objective of this study is to develop a semi-continuous process for the conversion of …

A Silicon Carbide Linear Voltage Regulator For High Temperature Applications, Javier Antonio Valle Mayorga

Graduate Theses and Dissertations

Current market demands have pushed the capabilities of silicon to the edge. High temperature and high power applications require a semiconductor device to operate reliably in very harsh environments. This situation has awakened interests in other types of semiconductors, usually with a higher bandgap than silicon's, as the next venue for the fabrication of integrated circuits (IC) and power devices. Silicon Carbide (SiC) has so far proven to be one of the best options in the power devices field.

This dissertation presents the first attempt to fabricate a SiC linear voltage regulator. This circuit would provide a power management option …

The Prevalence, Beliefs, And Instruction Of Using Homework Materials As Reported By Physical Educators In Arkansas, Daniel Joseph Burt

Graduate Theses and Dissertations

The purpose of the study was to find out the prevalence of physical educators assigning homework to their classes (17.4%) and to identify factors that are related to whether physical educators assign homework. The questionnaire was completed by 144 employed physical educators from the state of Arkansas.

Logistic regression, an independent samples t test, and a chi-square test were used to analyze if specific predictors, school demographics, and the personal beliefs of physical educators affected using homework in physical education. No statistical significance was found in the demographics or predictors, but nine of the beliefs selected indicated that a physical …

The Use Of Cortisol And Hba1c As Biomarkers Of Stress In University Administrators, Jacilyn Marie Olson

Graduate Theses and Dissertations

PURPOSE: The purpose of this study was to explore the impact of perceived stress and cardiorespiratory fitness on cortisol and HbA1c, biomarkers of stress, in a group of select university administrators. The impact of gender on these relationships was of special concern. METHODS: University administrators with job titles of Chancellor, Provost, Vice Chancellors and Vice Provosts of the university, and Deans and Associate Deans at the college level were recruited. Twenty-five administrators (15 males and 10 females) agreed to participate and completed a battery of assessments that included completion of the University Administrative Concerns Questionnaire, a finger-stick blood test for …

The Inclusion Of The Nature Of Science And Its Elements In Recent Popular Science Writing For Adults And Young Adults, Feng Jiang

Graduate Theses and Dissertations

This study was conducted to examine the inclusion of nature of science (NOS) in popular science writing to determine whether it could serve supplementary resource for teaching NOS. Four groups of documents published from 2001 to 2010 were included in the analysis: Scientific American, Discover magazine, winners of the Royal Society Winton Prize for Science Books, and books listed in National Science Teacher Association's (NSTA) Outstanding Science Trade Books for Students K-12.

First, computer analysis was performed to categorize passages in the selected documents based on their inclusions of NOS. Then, follow-up human analysis was conducted to assess the frequency, …

Optimization Models And Algorithms For Truckload Relay Network Design, Hector Andres Vergara Arteaga

Graduate Theses and Dissertations

Driver turnover is a significant problem for full truckload (TL) carriers that operate using point-to-point (PtP) dispatching. The low quality of life of drivers due to the long periods of time they spend away from home is usually identified as one of the main reasons for the high turnover. In contrast, driver turnover is not as significant for less-than-truckload (LTL) carriers that use hub-and-spoke transportation networks which allow drivers to return home more frequently. Based on the differences between TL and LTL, the use of a relay network (RN) has been proposed as an alternative dispatching method for TL transportation …

Cell Bioenergetics In Leghorn Male Hepatoma Cells And Immortalized Chicken Liver Cells In Response To 4-Hydroxynonenal Induced Oxidative Stress, Alissa Laura Piekarski

Graduate Theses and Dissertations

Bioenergetic mechanisms responsible for ATP production are essential in carrying out maintenance and cell-specific functions. In this study, hepatocytes (liver cells) were used to test both endogenous and exogenous stress on cellular respiration. The secondary lipid peroxide, 4-hydroxynonenal (HNE), was used because it alters bioenergetics by increasing mitochondrial proton leak that attenuates mitochondrial radical production and, therefore, endogenous oxidative stress. The major objective of this study was to demonstrate effects of HNE-induced oxidative stress on avian hepatocyte bioenergetics. Various chemical which help enable the determination of oxygen (O2) consumption linked to ATP synthesis (oligomycin), maximal O2 consumption (FCCP), and proton …

The Identification Of Quantitative Trait Loci For Sucrose And Stachyose Content In Soybean Seed, Ailan Zeng

Graduate Theses and Dissertations

Sucrose is a desirable sugar in soybean seed that affects the quality and taste of soyfoods, while stachyose is a non-digestible sugar that induces flatulence in non-ruminant animals. Therefore, soybean cultivars with high sucrose and/or low stachyose would be valuable for soyfood and meal markets. The objectives of this study were to identify quantitative trait loci (QTL) or genes associated with seed sucrose and stachyose content using simple sequence repeat (SSR) or single nucleotide polymorphism (SNP) markers. A low sucrose line, MFS-553, was crossed with a high sucrose plant introduction, PI 243545, to develop the sucrose QTL mapping population. A …

Consumer Sensory Preferences And Willingness-To-Pay For Nutraceutical-Rich Fruit, Lydia Lawless

Graduate Theses and Dissertations

Health-oriented juices are prime candidates for the nutraceutical market due to their inherent healthfulness and convenience. Fruits such as açaí berries, blueberries, blackberries, black cherries, Concord grapes, cranberries, and pomegranates are rich in potentially health-supporting polyphenolics, which makes the juices of these fruits attractive for nutraceutical optimization. The compositional, sensory, and stability properties of blueberry, blackberry, and Concord grape juice blends were explored in an extended shelf-life study. Initially, 100% blueberry juice had the highest total monomeric anthocyanins (67.40 mg/100mL), 100% blackberry juice had the highest total phenolics (249.24 mg/100mL), and 100% Concord juice had the highest polymeric color (23.21%). …

A Reexamination Of The Eastern Collared Lizard (Crotaphytus Collaris Collaris) In Arkansas, Ashley A. Grimsley

Graduate Theses and Dissertations

Loss of suitable habitat is a threat to species worldwide. Habitat destruction, including loss, change, and fragmentation of habitat, is the leading cause of species extinction. Eastern collared lizards (Crotaphytus collaris collaris) are habitat specialists on glades. Both C. c. collaris and glade habitats are rare and of special concern in the state of Arkansas. Many glade populations have already been extirpated in the Ozarks of Arkansas and Missouri. Increasing knowledge of the distribution, habitat structure, and population dynamics of C. c. collaris is important to ensure the survival of this species in Arkansas.

A literature review of …

Fabrication And Characterization Of Thinner Solid-State Nanopores, Denis Forbi Tita

Graduate Theses and Dissertations

Solid State nanopores that are fabricated by the ion beam sculpting process and electron beam drilling have shown great promise as a sensing device for DNA and protein molecules. Even though biological pores such as the alpha-Haemolysin have been in use for quite some time, the use of solid state Nanopores in single biomolecule detection has been on the rise since the mid 1990s. Solid State nanopores have an advantage over biological pores in that they are more robust, stable, and can be sculpted to any desired size for use in translocation experiments. One of the major challenges in Nanopore …

What Factors Influence Consumers' Willingness To Purchase And Consume Carbon-Labeled Rice: A Comparative Study Between Arkansas And Belgium, John A. Kelley

Graduate Theses and Dissertations

Climate change is an issue of growing importance around the globe. As global population increases so does attention focused on human contributions to climate change. One major way humans contribute to climate change is through our diets. Agricultural production is a major source of global greenhouse emissions. It has been estimated that food production is responsible for a large majority of the methane and nitrous oxide which is emitted into our atmosphere each year. Carbon footprint labeling has been developed to give consumers a way to lower their footprint and help lower emissions of greenhouse gasses. At least one retailer, …

Concurrent And Dual Credit: The Bridge To Postsecondary Education For First-Generation College Students, Todd Arron Loftin

Graduate Theses and Dissertations

One of the most significance Social challenges facing the United States is increasing the number of students entering postsecondary education and having them persist to degree completion. To accomplish this undertaking, more first-generation college students must matriculate and find academic success. Considerable research exists concerning the barriers first-generation students must overcome; however, little research exists regarding the benefits of participating in dual and concurrent credit coursework as a way to increase confidence and prepare for the rigors of higher education.

The purpose of this correlational, quantitative, exploratory study was to consider the impact of dual and concurrent credit on the …

Contextual Influences On Small Group Decision-Making: A Field Investigation, Sarah Kathryn Chorley

Graduate Theses and Dissertations

This thesis examines small group decision-making among groups of educators in an elementary school through the Bona Fide Group Perspective, which focuses on a group and its relationships to elements in its context. Twenty-six faculty members were interviewed and 26 meetings were recorded; these were analyzed using thematic analysis. The results indicated contextual, relational, and discursive factors influenced the decision-making process. Most critically, power, status, overlapping group memberships, and competing Discourses shaped the group decision-making process.

Evaluation Of Internal Markers For Predicting Digestibility And Fecal Output By Cattle Fed Bermudagrass Hays Of Varying Quality, Juvenal Kanani

Graduate Theses and Dissertations

The potential of in situ rumen undegradable dry matter (RUDM), indigestible neutral-detergent fiber (INDF), indigestible acid-detergent fiber (IADF), acid-detergent insoluble ash (ADIA), alkaline-peroxide lignin (APL), and acid-detergent lignin (ADL) to predict digestibility (DMD) and fecal output (FO) by cattle fed bermudagrass [Cynodon dactylon (L.) Pers.] hay-diets categorized by their low (L), medium low (ML), medium high (MH), or high (H) CP concentrations (79, 111, 131, and 164 g/kg DM, respectively) was evaluated. The second objective was to evaluate the effects of time (0600, 1200, 1800, and 2400 h) of fecal sampling on the prediction of FO and DMD. A replicated …

The Effects Of Body Modifications And Dress On Perceived Professionalism And Competency Of A Female Model, Ashley Donell

Graduate Theses and Dissertations

Through the norms of a society, people must meet certain expectations in order to survive and provide for their family. For example, job expectations driven by human judgment on appearance creates a norm that society must follow. The question is how much appearance attributes such as dress and hair color effect others' interpretation of who a person may be? The purpose of this study was to evaluate the relationship between specific appearance and body modifications (dress and hair color) of a young female professional and perceived competency level as determined by a convenience sample of students in selected senior level …

Gendered Effects On The Child Welfare Agency Decision-Making Process, Brandon Crawford

Graduate Theses and Dissertations

Previous research on child abuse and neglect suggests that there may be gendered relationships between child victims and case outcomes. Specifically, although agency practices may generally regard most male and female children as equally vulnerable, agency attributions regarding the culpability, need, and suitability of parents may be highly differentiated based on gender. Explanations for this pattern may lie in the cultural ideologies and organizational beliefs that distinguish between the perceived rights, responsibilities, and relative importance of mothering and fathering roles. That is, one function of Social service agencies is to uphold Social constructions of parenting and promote our larger cultural …

The Effects Of First-Year Students' Self-Perceptions Of Behaviors, Attitudes, And Aptitudes On Their First-To-Second-Year Persistence, Rebecca Jean Lambert

Graduate Theses and Dissertations

Student persistence continues to be a topic of much research and discussion in higher education. Based on Bean and Eaton's (2000) psychological theory of persistence for its theoretical framework, this study examined the effect of students' demographic and background characteristics and students' self-perceptions on their first-to-second-year persistence at a small, private, faith-based institution. Demographic and background characteristics examined were gender, race/ethnicity, first-generation college student status, high school GPA, and type of high school attended. Four constructs from the CIRP Freshman Survey were used to examine student self-perceptions: (a) Habits of the Mind, (b) Academic Self-concept, (c) Social Self-concept, and (d) …

Ultra-Low Voltage Digital Circuits And Extreme Temperature Electronics Design, Aaron J. Arthurs

Graduate Theses and Dissertations

Certain applications require digital electronics to operate under extreme conditions e.g., large swings in ambient temperature, very low supply voltage, high radiation. Such applications include sensor networks, wearable electronics, unmanned aerial vehicles, spacecraft, and energyharvesting systems. This dissertation splits into two projects that study digital electronics supplied by ultra-low voltages and build an electronic system for extreme temperatures. The first project introduces techniques that improve circuit reliability at deep subthreshold voltages as well as determine the minimum required supply voltage. These techniques address digital electronic design at several levels: the physical process, gate design, and system architecture. This dissertation analyzes …

The Impact Of Selected Forage Legumes On Cattle Performance, Forage Production, And Soil Quality, And Evaluation Of Legume Persistence Under Grazing, Bradley Edward Briggs

Graduate Theses and Dissertations

Interest in substituting legumes for N fertilizer in beef cattle grazing systems has recently increased with rising fertilizer prices. Legumes are well known for their ability to fix atmospheric N and decrease dependence on input of N fertilizer. However, there are still difficulties associated with legume utilization including establishment and persistence. Two experiments were conducted to evaluate legume performance under herbivory. The objective of Experiment 1 was to compare forage production and beef cattle gains from annual ryegrass [Lolium multiflorum (L.)] and bermudagrass [Cynodon dactylon (L.) Pers.] pastures fertilized with N or overseeded with legumes. Gelbvieh × Angus …

Performing Literacy: How Women Read The World In The Late Eighteenth-Century British Novel, Amy Hodges

Graduate Theses and Dissertations

This dissertation explores the intersection of sensibility, Social identity, and literacy practices among representations of women readers in four late eighteenth-century British novels. Through an analysis of the authors' use of identity constructs which shaped and were shaped by reading practices, this study documents the rise of Social identity formation as mutually constitutive with the history of reading. The first chapter reveals how Charlotte Lennox's The Female Quixote uses Arabella's follies as education for readers about the corresponding processes of reading their society and reading novels. The second chapter argues that Frances Burney's Evelina considers women's ability to read others …

Groundwater Quality Assessment From Domestic Water Wells In The Fayetteville Shale Gas Play Area In Central Arkansas, Anna Marie Nottmeier

Graduate Theses and Dissertations

This study establishes a spatially distributed domestic water well groundwater quality data set, throughout the Fayetteville Shale Gas Play (FSGP) in central Arkansas. The data set facilitates characterization of the geology and groundwater quality across the study area, benefits residents who may have concerns about the potential impacts on their well water quality, and provides a groundwater quality basis to which complaints can be compared and resolved. The assessment included: research of the study area, site reconnaissance, water sampling and collection, interviews with owners of the property, analytical analysis, Quality Assurance and Quality Control, and groundwater data interpretation.

The study …

Book Review: The Non-Designer’S Presentation Book: Principles For Effective Presentation Design, Megan Hodge

LOEX Quarterly

No abstract provided.

Kickstarting Research: Using A Concept Cloud To Formulate Effective Searches, Meridith Wolnick, Todd Burks

LOEX Quarterly

No abstract provided.

Techmatters: Get More Animated: Online Tools For Creating Cartoon Videos In The Classroom, Krista Graham

LOEX Quarterly

No abstract provided.

The Evolution Of Natural Plant Communities Through Crop Migration And Crop-To-Weed Gene Flow, Meredith G. Schafer

Graduate Theses and Dissertations

With the rising demand for food and biofuels, the efficiency of crop production has become vital to assuring food security. Genetically engineered (GE) crop varieties are broadly thought to be a solution for improving the efficiency of crop production, but concerns regarding their release have heightened as more discoveries have focused on the influence of genetically engineered crops on native and weedy plant species. Risk assessment of GE crop varieties focuses on two main areas: feralization of crop systems and crop-weed hybridization. Risks include naturalization, transgene introgression, and the formation of novel genotypes in natural systems. In this study, roadside …

Interactions Between The Thermic Effect Of Food And Exercise On Total Energy Expenditure In Moderately Active Females, Ashley Binns

Graduate Theses and Dissertations

Diet and exercise are key components to overall health maintenance. Aspects contributing to weight maintenance include the thermic effect of food (TEF) and total energy expenditure (TEE), with TEF contributing to upwards of 10% TEE. PURPOSE: The purpose of this study was to determine the interaction between TEF and exercise on TEE in moderately active females. METHODS: A sample population was established with the use of a health history questionnaire (HHQ). Ten active females of normal body composition, determined by body mass index (BMI) and a dual energy absorptiometry x-ray (DEXA) scan, participated in the study. Maximal aerobic …

The Ipad As An Instructional Tool: An Examination Of Teacher Implementation Experiences, Brandie Kay Benton

Graduate Theses and Dissertations

At present, handheld devices and tablet computers are infiltrating public schools across the nation, the most popular model being the Apple iPad. Schools and teachers are attempting to integrate the devices and are using a variety of methods and models for implementation. The purpose of this study was to examine the implementation of the iPad as an instructional tool through the experiences of classroom teachers.A review of related literature was conducted to inform the conceptual framework, design, data collection, analysis, and synthesis components and stages of this study. Qualitative methods, including teacher-participant interviews and classroom observations, were utilized in this …

A Case Study Of Two High School English Teachers Transitioning From Arkansas Writing Standards To Common Core Writing Standards In The Secondary English Classroom, Cindy M. Williams

Graduate Theses and Dissertations

The purpose of the study is to gain an understanding of secondary English teachers' perceptions towards implementing Common Core writing standards. The study allowed me to examine how teachers' perceptions affect the level of implementation of Common Core writing standards in their English classrooms during the first year. The study focused on two research questions and two sub-questions centering on the perceptions of secondary English teachers and how they are responding to early implementation to the Common Core State Standards. Specific facets to consider in teachers' transitioning from state standards to Common Core standards are what pedagogical training opportunities teachers …

A Classical Journey In A Contemporary World: Directing Naomi Iizuka's Anon(Ymous), Maria Chiara Pipino

Graduate Theses and Dissertations

This thesis paper is on the directorial journey that led to the production of Anon(ymous), by Naomi Iizuka, at the University Theatre in spring 2012. The following chapters will discuss the birth and evolution of the production, the approach to the script from the director's point of view and the creative process.