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Long-Term Residue And Water Management Effects On Soil Respiration And Soil Aggregate Stability In A Wheat-Soybean, Double-Crop System In Eastern Arkansas, Sharon Faye Smith

Graduate Theses and Dissertations

Sustainability in agriculture is paramount to assuring continued production from our most naturally fertile soils. Storing carbon (C) in soil as organic matter through sustainable agricultural management practices can both remove atmospheric C and improve soil quality. The objective of this study was to evaluate the long-term effects of water management (irrigation and dryland), residue management [burn and no-burn, conventional (CT) and no-tillage (NT)] and residue/fertility level (high and low) on soil respiration and aggregate stability in a wheat- (Triticum aestivum L.) soybean [Glycine max (L.) Merr.], double-crop system in a silt-loam soil (Aquic Fraglossudalf) in the Mississippi River Delta …

The Jim Lindsey Story, Clinton Robert Fullen

Graduate Theses and Dissertations

The history of Arkansas Razorback football is composed of legends, and without a doubt, Jim Lindsey is one of its most successful players—on and off the field. Lindsey won a national championship, became an NFL captain and built a thriving real–estate empire across the South.

Narrated by Dallas Cowboys owner Jerry Jones, “The Jim Lindsey Story” begins in the Arkansas Delta. Back then, Lindsey was simply a small boy who dreamt of playing ball. Weekdays were spent in the cotton fields, and weekends were used for cow–pasture baseball. In time, that boy grew up to be a very big man. …

Management Of Katahdin Hair Sheep, Elizabeth Ann Backes

Graduate Theses and Dissertations

The objectives of this research were to determine the effects of different management practices on Katahdin hair sheep performance. For experiment 1, over 2 yr, 5, 0.4-ha pastures were allocated randomly to 1 of 2 grazing treatments: 1) Continuous; or 2) 4-cell rotation. Fifty yearling Katahdin ewes (53 ± 0.7 kg initial BW; 3.3 ± 0.09 initial BCS) were stratified by BW and BCS and allocated randomly to pastures in early May. Grazing d, basal cover, forage quantity or quality did not differ across treatments; however, sampling date effects were detected for forage quantity and quality. Beginning and end of …

The Effect Of Music Training On Emotion Perception In Childhood, Emese Maroti

Graduate Theses and Dissertations

Numerous studies found evidence that music training can enhance cognitive abilities both for children and adults. However, no evidence was found yet, whether music training can enhance abilities in emotion perception. I tested 8-9 year-old children on emotion perception in visual and musical contexts. The tests did not show significant difference between the musically trained and non-trained group neither in visual nor in musical context, however, when emotion scores were analyzed separately for each piece of music, musically trained children's responses reflected stereotypical modes of approaching emotional meanings in music, moreover, musically trained children's judgments were more uniform as there …

Ecological Importance Of Ectomycorrhizal Linkages In The Ozark Mountains And The Fernow Experimental Forests, Shelly Kendra Bursick

Graduate Theses and Dissertations

Underground stem-to-stem linkages involving ectomycorrhizal (ECM) fungi are probably important in forest ecosystems, since these linkages could assist in the survival of established trees as well as increasing the growth and development of seedlings and saplings. This study compared forest communities of the Ozark Mountains of northwest Arkansas and the Fernow Experimental Forest in West Virginia by examining species richness, diversity, relative abundance, and the potential for stems to exhibit spatial distribution and clustering patterns that reflected the existence of linkages by ECM fungi. Data on forest communities in the Ozarks were obtained from eight plot locations in Devil's Den …

Analysis Of Social Networks In A Virtual World, Gregory Thomas Stafford

Graduate Theses and Dissertations

As three-dimensional virtual environments become both more prevalent and more fragmented, studying how users are connected via their avatars and how they benefit from the virtual world community has become a significant area of research. An in-depth analysis of virtual world Social networks is needed to evaluate how users interact in virtual worlds, to better understand the impact of avatar Social networks on the virtual worlds, and to improve future online Social networks.

Our current efforts are focused on building and exploring the Social network aspects of virtual worlds. In this thesis, we build a Social network of avatars based …

Kirschner's Modal Ontological Argument, Andrew Kirschner

Graduate Theses and Dissertations

Ontological Arguments for the existence of God, first discovered by St. Anselm (1033-1109), attempt to deduce the existence of God from the concept of God. It is the aim of this thesis to champion a modal version of the Ontological Argument as philosophically sound by demonstrating it to be logically valid and by successfully defending the argument's premises as true. Kirschner's version of the Ontological Argument states:

P1 For every type of entity, instances of that type of entity either actually exist, merely possibly exist, or necessarily do not exist.

P2 If an entity can be conceived, then that entity …

Two Studies On Childhood Obesity: Effect Of Obesity On Academic Achievement And Effect Of Food Store Access On Diet Quality, Gaogao Yu

Graduate Theses and Dissertations

This thesis includes two studies on childhood obesity. This first study investigates whether childhood obesity rates affect their academic achievement scores by using a school-level panel data set on Arkansas 4th and 6th grades. The main results indicate that childhood obesity rates do not significantly affect academic achievement scores. Controls for education inputs such as library volume, educational expenditures per student and teacher salary show consistently significant positive relationship to students' test scores in both whole sample and in subsample analyses by socio-economic and minority status. The second study examines the effect of a neighborhood food environment feature, specifically food …

The Material Culture Of Migrant Life At The U.S./México Border, Consuelo Helen Cano Crow

Graduate Theses and Dissertations

Material culture is the aggregate of physical objects or artifacts used by or discarded by a past culture or society. Contemporary unauthorized migration at the U.S./México border has left thousands of pounds of migrant goods in what are referred to by United States Border Patrol as "lay-up sites". Since the late 1990's, undocumented migrants attempting to cross the Sonoran Desert of Arizona have been exposed to a distinctive set of material culture. This rapidly-evolving material culture is specific to the phenomenon of border-crossing, and it reflects and shapes the experience of migrants attempting the crossing. Migrants Stations, also known as …

An Evaluation Of Teaching Methods Based On Cognitive Achievement, Ryan Patrick Siebenmorgen

Graduate Theses and Dissertations

The purpose of this study was to determine if there were any significant differences (p < .05) in cognitive achievement between different instructional techniques on students enrolled in high school agricultural science classes in Northwest Arkansas. Lesson content covered the

production, uses, and performance of biodiesel fuels in compression engines. Treatments were different instructional techniques including lecture, demonstration, and a combination of lecture and demonstration. Cognitive achievement was measured on low level cognition and high level cognition. In addition, this study sought to find any correlation between student perceptions of lecture versus demonstration and tinkering self-efficacy on student achievement.

A true experimental pretest-posttest design (#2) was used to conduct this research (Campbell & Stanley, 1996). The population consisted of all students enrolled in high school …

Visual And Linguistic Influences On Public Perceptions Of Swine Confinement, Arthur Leal

Graduate Theses and Dissertations

This study was designed to analyze the visual and linguistic characteristics of online (YouTube) videos and electronic newspapers, identifying relationships with positive, negative, and neutral attitudes toward swine confinement.

This study followed a content analysis design. Two coders, trained to an acceptable level of agreement (κ = .68), examined online videos and electronic newspapers, assessing linguistic and visual images used in relation to attitudes toward swine confinement. A series of search terms deemed suitable for this study's objectives were employed in multiple search engines, and 48 articles and 157 videos were coded for content.

Results from this study showed that …

The Process Of Bringing An Original Playscript To Production--Flamingo & Decatur, Todd Taylor

Graduate Theses and Dissertations

The aim of this dissertation is to present my play, Flamingo & Decatur, to the thesis committee, to illuminate the process of writing it, and to place it within the context of the entire body of dramatic writing I've done here at the University of Arkansas.

The dissertation opens with a narrative essay that details the process of bringing Flamingo & Decatur to production. It describes the germination of the idea for the play and follows the process through the initial drafts--detailing the ways in which the script was reshaped through its various iterations. Special attention is given to the …

Evaluating Economic And Environmental Impacts Of Changing Herd Sire Genetics On Arkansas Cow-Calf Operations, Daniel Keeton

Graduate Theses and Dissertations

This research looks at impacts of changing sires, and thus bull genetics, on cow-calf operations of varying land and herd sizes in the state of Arkansas. A 2012 Across-Breed EPD table, adjusted to the Angus breed, was used to estimate breed sire effects on birth weight and weaning weight of the herd's offspring (Kuehn and Thallman 2012a). Together with modified animal performance, the use of 2012 and most recent five- and ten- year Arkansas state average prices, allowed the evaluation of changing herd sires by accounting for breed type and hide color differences in prices. Using a spreadsheet tool that …

The Children Of Amarna: Disease And Famine In The Time Of Akhenaten, Kathleen Kuckens

Graduate Theses and Dissertations

What is now known as Amarna, Egypt there once stood a grand city. Hastily built and quickly abandoned, this once capital city of Egypt was the brainchild of the Pharaoh Akhenaten. In 2002 the final resting place of the inhabitants who populated this ancient city were discovered. Since excavations began at the South Tombs Cemetery an unusual high number of individuals aged 3-25 have been excavated. Out of the 278 individuals excavated thus far, 45% of them fall to the adolescent and sub-adult category. Under normal circumstances this portion of the population tends to be the most robust and resilient, …

Development Of Rapid Detection Methods And Novel Control Measures For Salmonella In Poultry, Si Hong Park

Graduate Theses and Dissertations

This dissertation consists of three research parts: 1) development of rapid detection methods for foodborne pathogens; 2) immune response of chicken cells against Salmonella and bacteriophage P22; 3) evaluation of novel control measures for poultry productions. In order to develop rapid and accurate detection methods for foodborne pathogens, two types of PCR assays were utilized. Three foodborne pathogens included Campylobacter, Escherichia coli and Salmonella in watershed were qualitatively and quantitatively detected by multiplex PCR and qPCR (chapter 2). Since Salmonella species are commonly present in poultry and poultry products as well as most popular foodborne pathogen in …

Structure-Function Relationship Of The Ligand-Binding Domain Of The Fibroblast Growth Factor Receptor, Ryan Thurman

Graduate Theses and Dissertations

The interactions between FGF and fibroblast growth factor receptors are responsible for the regulation of key cellular processes. FGF is important in both germ cell and embryonic developments. FGF continues to play important roles during adulthood by regulating embryogenesis, cell differentiation, and wound healing (1-7). The regulations of these cellular events are initiated through FGF binding to the fibroblast growth factor receptors. The complex formed by FGF and the receptor involves a key interaction with heparin. Through interactions with heparin, the FGF, FGFR and Heparin form a 2:2:2 complex (8). This complex formation results in autophosphorylation in the tyrosine kinase …

A Geomechanical Study Of The Mississippian Boone Formation, Karen Nicole Mason Buckland

Graduate Theses and Dissertations

The Boone Formation in northwest Arkansas is a chert-limestone sequence analogous to the subsurface Mississippi Lime reservoir in parts of Oklahoma and Kansas. It has low permeability and produces via horizontal drilling and hydraulic fracturing. The response to stimulation by fracturing is dependent on the quantity of chert in the area. Chert nodules and laterally extensive chert layers in the sequence are variable. Locally, cm- to dm-scale chert bedding is continuous and comprises up to 50% of the outcrop. Elsewhere, the chert is nodular and intermittent.

Samples collected from representative outcrops spanning the thickness and aerial extent of the formation …

Essays In Economic Growth And Development, Zhen Zhu

Graduate Theses and Dissertations

This dissertation consists of three chapters exploring the Solow Residual of the Solow growth model. Two central components of the Solow Residual have been studied in my doctoral dissertation. The first is the structural transformation, an internal adjustment process that helps the economy attain the optimal points on its Production Possibility Frontier by reallocating resources from the low-productivity sectors to the high-productivity sectors. The second is the technology diffusion, a positive externality process that pushes forward the economy's Production Possibility Frontier if it adopts the newer technology.

The first chapter of my dissertation is devoted to a case study of …

Characterization And Quantification Of Monomers, Oligomers, And By-Products From Switchgrass Hemicelluloses During Biomass Pretreatment, Kris Allan Bunnell

Graduate Theses and Dissertations

Production of fuels and chemicals from biomass is contingent upon economical release of carbohydrates from biomass. Carbohydrates can then be used for production of bio-based products using a biochemical conversion process. Pretreatment, the first step of the biochemical conversion process, has been suggested to be the most costly step of the conversion process. Thus, better understanding the behavior of biomass during pretreatment is imperative for an economically viable production of biofuels and chemicals. Elucidating the physicochemical properties of biomass and developing an understanding the depolymerization patterns of biomass during pretreatment will help progress towards this goal.

In this study, July- …

Genome-Wide Association Mapping Identifies Qtls And Candidate Genes For Salt Tolerance In Soybean, Lei Huang

Graduate Theses and Dissertations

Salinity is a common abiotic stress causing soybean yield loss worldwide. Use of tolerant cultivars is an effective and economic approach to coping with this stress. Toward this, research is needed to identify salt-tolerant germplasm and better understand the genetic and molecular basis of salt tolerance in soybean. The objectives of this study were to identify salt-tolerant genotypes, to search for SNPs and QTLs associated with salt tolerance, and to identify candidate salt tolerance genes. A total of 192 diverse soybean lines and cultivars were screened for salt tolerance in the greenhouse based on visual leaf scorch scores after 15 …

Algae To Propellants: Biosynthesis Of 1,2-Propanediol From Algal Derived Sugars, Lauren Rachelle Merriman

Graduate Theses and Dissertations

Propylene glycol dinitrate (PGDN) is an important component used in the formulation of energetic materials. A renewable, environmentally-friendly and effective production technique for the production of 1,2-propanediol, an important precursor to PGDN, is desired. While fermentation of 1,2-propanediol has been achieved, it suffers from major limitations such as expensive feed sugars and relatively low yields. It is hypothesized that algae sugars could serve as a feedstock for the microbial synthesis of 1,2-propanediol, thereby reducing production costs and enhancing sustainability.

Algal biomass produced from an Algal Turf Scrubber® has proven to have significant potential as a source of fermentable materials. However, …

Influences Of Music Genre And Components On Food Perception And Acceptance, Alexandra Jean Fiegel

Graduate Theses and Dissertations

Managers of consumer goods companies (i.e., restaurants, grocery stores, and bars) have the potential to effectively utilize environmental factors to stimulate desired consumer behaviors. Background music has been identified as one of the most readily manipulated and influential elements to which a shopper or consumer may be exposed to in a service setting. Nevertheless, little is known about the effect of background sound on food perception and acceptance. This research sought whether background music genre and musical components can alter food perception and acceptance, but also to determine how the effect can vary as a function of food type (i.e., …

A Roadmap To Mindful Consumption Through Informative Labeling Practices: The Effects Of Sustainability Disclosure Formats On Consumer Product Evaluations, Yoon-Na Cho

Graduate Theses and Dissertations

Despite the interest of consumers in sustainable and environmentally friendly products, only a limited number of studies have focused on sustainability level disclosures for consumer packaged goods. The general overarching purpose of this dissertation is to extend the internal reference point and information processing literatures to better understand how consumers will process sustainability disclosures. Applying the theoretical lens of assimilation bias in conjunction with self-enhancement offers an important extension to prior work. Across two retail lab studies and four online experiments, I demonstrate that the perceived sustainability utility (i.e., the difference between a specific brand's level of sustainability and category-level …

Ecology And Structure Of Black Bear (Ursus Americanus) Populations In The Interior Highlands Of Arkansas, Thea Vandervelde Kristensen

Graduate Theses and Dissertations

In the Interior Highlands of Arkansas, Missouri, and Oklahoma, over-harvest, extensive logging, and reductions of habitat availability by other means contributed to the decline of black bears (Ursus americanus). Bears were extirpated from the majority of the region by the 1940's Oklahoma by 1915 and from Missouri by 1931. From 1958-1968, the Arkansas Game and Fish Commission undertook a reintroduction to the Ouachita and the Ozark National Forests in Arkansas. The successful growth and expansion of the released population caused these efforts to be considered one of the most successful reintroductions of carnivores. In this dissertation, I sought to examine …

The Meaning Of Play For Adults From A Reversal Theory Perspective, Linda Lane

Graduate Theses and Dissertations

Play is important to adults' mental creativity and happiness (Marano, 1999), and stress reduction (Apter, 2009a; Baptiste, 1995). Yet play may be considered as trivial behavior that is not appropriate for the adult population. The purpose of the study was to examine how adults describe the concept of play and to determine whether this description reflects their dominant metamotivational state. According to reversal theory, these states are the frames of mind that characterize an individual's motivation at any given point in time (Apter, 1982). An individual tends to be in a more playful (paratelic) state or serious-minded (telic) state depending …

Characterization Of Host Immune Responses To Eimeria Adenoeides Infection In Turkey Poults, Ujvala Deepthi Gadde

Graduate Theses and Dissertations

Coccidiosis is a common enteric disease of turkeys that is caused by protozoan parasites belonging to the genus Eimeria. There are about seven species of Eimeria that affect turkeys and of these E. adenoeides is the most pathogenic and commonly recognized. Infection with Eimeria is known to induce a long lasting protective immunity in chickens, but nothing is known regarding the acquisition of immunity to Eimeria in turkeys. The experiments reported here were aimed at investigating the biological and cellular immune response to E. adenoeides in turkey poults under different conditions of exposure. In experiment 1 (Chapter II), 20 …

Effects Of High-Velocity Versus Low-Velocity Resistance Training On Resting Metabolic Rate And Functional Performance In Older Adults, Laura Ashleigh Morgan

Graduate Theses and Dissertations

The purpose of this study was to compare the effects of a 12-week high-velocity resistance training (HVRT) protocol to a traditional low-velocity resistance training (LVRT) protocol on resting metabolic rate (RMR) and other selected measures of muscular and functional fitness in older adults. Nineteen adults between the ages of 65 and 82 participated: 8 HVRT, 7 LVRT, and 4 controls (CTRL). Initially, no differences existed between groups except for age (p = .016). HVRT (75.6 years) was older than LVRT (69.6 years) and CTRL (69.3 years). The exercise intervention consisted of 2 days/week sessions for 12 weeks at 3 sets …

Evaluation Of Broiler Litter Heat Production During Windrowing & Nitrogen Based Gas Emission Mitigation Using Biofilter, Min Lei

Graduate Theses and Dissertations

Ammonia emission from animal feeding operations (AFOs) has negative effects on environment and animals' health. Thus measuring and mitigating ammonia emission from AFOs is important for environmental protection. In chapter I, different ammonia measurements were discussed and a mitigation technology- biofilter was represented.

In-house windrowing of built-up litter has been used by broiler producers to reduce pathogen loads and rejuvenate litter for the next flock. When litter is piled up for an extended period during downtime, heat generated by the litter pile can become a substantial heat source due to the metabolism of microorganisms. In chapter II, heat production rates …

Turpentine Creek: Arkansas' Refuge, Jacob Paul Bain

Graduate Theses and Dissertations

The goal of this Master's thesis film project was twofold. First, I wanted to explore the problem, huge but relatively unknown, of the ownership of exotic pets in the United States of America. Second, in conjunction with that problem, I wanted to see how Turpentine Creek Wildlife Refuge (TCWR) approached it and what, as an organization, they do to help resolve this problem locally and nationally. In turn, the film also provides an in-depth look at a very unique refuge in the state of Arkansas. Using my own equipment, I shot and edited a short-form documentary about TCWR. The film …

Nonprofit Board Members' Self-Perception In The Role Of Organizational Governance And The Balanced Scorecard, Jeffrey John Aulgur

Graduate Theses and Dissertations

This qualitative case study examines the gap between expectations of board performance held by the senior leadership and the governing board's self-perception of their role in the governance of the nonprofit organization. The primary research question is: Is an analysis of the gap between governance expectations and the board members' self-perception of governance performance an effective methodology for enhancing the efficacy of the governing board of directors? Nonprofit governance and its effectiveness are difficult concepts to define, given the wide disparity in organizational sizes, structures, and missions. While the academic literature does not identify a dominant methodology for organizational effectiveness …