Digital Commons Network^™

Combining Translational And Functional Genomic Approaches To Augment Management Strategies Of Plant Parasitic Nematodes, Sandeep Sharma Khatiwada

Graduate Theses and Dissertations

Plant-parasitic nematodes pose a major threat to crop yield worldwide. Discontinued use of harmful chemicals has prompted the search for alternative management strategies that are effective yet environmentally friendly. Harpin proteins, which are derived from bacteria, and nematophagous fungi, natural predators of nematodes, are ideal for biological control of plant-parasitic nematodes. However, research on the efficacy of harpin proteins on nematodes, and biology of nematophagous fungi is minimal. Previously, a taxonomically uncharacterized nematophagous fungus designated ARF18 effectively suppressed nematode populations in soil. The overarching goal of this dissertation is to utilize applied and functional genomic approaches to augment management of …

The Societal Impacts Of Private School Choice Around The World, Corey Adam Deangelis

Graduate Theses and Dissertations

With the 2016 presidential campaign and the appointment of Betsy DeVos as Education Secretary of the United States, private school choice – in the form of vouchers, tuition tax-credits, and education savings accounts – has become increasingly policy relevant. While an introduction of competitive pressures into the schooling sector may improve educational quality levels, the effects on societal outcomes such as national test scores, student effort, and criminality may be less clear. After all, traditional public schools were created to ensure that children from diverse backgrounds became proper citizens.

These three dissertation chapters empirically examine a largely underexplored area: the …

Predicting The Impact Of Resource Delays On A Construction Project’S Critical Path Using Monte Carlo Simulation, Colby Weishaar

Graduate Theses and Dissertations

The construction industry is a complex and evolving industry, making the project manager’s job of planning, organizing, and making decisions a difficult one. One of the most difficult decisions throughout a project is determining what resources are needed to complete a task by the deadline. Uncertainties cause risks within the schedule often creating delays for which the project manager must develop a mitigation plan once risks are identified. After conducting a review of the literature, no research was found examining the use of an analytical model to estimate the delays caused within the resource allocation process. If an analytical model …

Consumers’ Willingness To Pay For Hydroponic Lettuce, Daniel Gilmour

Graduate Theses and Dissertations

With continued advances in hydroponic plant production technology, an increasing number of farms have begun using hydroponic techniques to grow leaf lettuce and other food crops in a controlled environment. Recent controversy about the ongoing inclusion of hydroponics in the USDA organic program has highlighted uncertainty about marketing for hydroponic crops. In November 2017, the National Organic Standards Board voted not to recommend that hydroponic farms be banned from applying for organic certification. Since then, continued controversy has led a group of organic producers to start an additional independent certification program that would exclude hydroponic crops. While hydroponic production may …

The Myth Of Southern Atonement: Constructed Forgiveness In Public Spaces, Elizabeth Ashley Clayborn

Graduate Theses and Dissertations

This thesis provides a rhetorical analysis of public space in Arkansas and examines the ways in which the myth of Southern Atonement is constructed within those spaces. Three formal elements characterize Southern Atonement: absolution from the past, distinctiveness in constructed authenticity, and hope for a post-racial future. The analysis develops over three case studies which I argue contribute to the construction, engagement, and actualization of this cultural myth. The first chapter looks at Fort Smith, Arkansas, and The Unexpected art project as a source of identity construction and place attachment. Then I examine The Billgrimage, or the monuments and museums …

Formal Learning In An Informal Setting: The Cognitive And Affective Impacts Of Visiting A Science Center During A School Field Trip, Charlie Belin

Graduate Theses and Dissertations

With the pressures of budget cuts, many schools--particularly schools serving low-income students--are eliminating school field trips to museums, zoos, and other cultural institutions despite their widely reported utility. First, through a systematic review of the literature, I examine the findings from 17 international studies on the benefits of visiting an informal science education institution during a K-12 school field trip. Almost all pre-post studies reported a positive change in both cognitive and affective outcomes after visiting an ISEI. However, studies that also included a control group to compare students who visited the ISEI with students who had yet to visit …

Demonstrating Set-Based Design Techniques- A Uav Case Study, Colin Small

Graduate Theses and Dissertations

The Department of Defense (DoD) and Engineered Resilient Systems (ERS) community seek to improve decision making in the Analysis of Alternatives (AoA) process by incorporating resilience and leveraging the capabilities of model-based engineering (MBE) early in the design process. Traditional tradespace exploration utilizing Point-Based Design (PBD) often converges quickly on a solution with subsequent engineering changes to modify the design. However, this process can lead to a suboptimal solution if an incorrect initial solution is chosen. Enabled by MBE, Set-Based Design (SBD) considers sets of all possible solutions and enables down-selecting possibilities to converge on a final solution. Using a …

A Multi-Objective Affinity-Based Savings Algorithm For Improving Processes In Centralized Warehousing Operations, Mckenlee M. Coco

Graduate Theses and Dissertations

Traditional approaches to improving material management processes in warehousing operations tend to focus on one of three major areas: facility design, order picking and sorting, and order batching. In an effort to improve total system savings, a new affinity function is developed and applied to batching logic to create a multi-objective problem. The proposed multi-objective function incorporates user input to increase adaptability to changing demand and flexibility to changing requirements. Computational experience shows the new function leads to solutions that deviate no more than 25% from the most efficient distance based picking route by the same batching logic, while creating …

Preservice Agricultural Education Teachers And Secondary Education Teachers’ Self-Efficacy And Professional Identity, Hailey Gates

Graduate Theses and Dissertations

During the nineteenth century, a decision was made to separate the preparation of agricultural education teachers from their elementary and secondary counterparts (Hearings, 1908; Heren & Hillison, 1996; Hillison, 1986). The majority of land-grant universities and colleges have continued to prepare agricultural education preservice teachers within the college of agriculture, separate from other secondary education preservice teachers in the college of education (Myers & Dyer, 2004). Despite the differences among content disciplines, teachers who possess a strong sense of self-efficacy and professional identity have higher success rates in the classroom when it comes to collaboration, involvement, and student achievement (Ashton …

Perceived Maternal Invalidation And Drinking Behavior: The Role Of Action Control, Elise Ann Warner

Graduate Theses and Dissertations

Alcohol use disorder is one of the most prevalent disorders worldwide. As such, researchers have examined factors contributing to alcohol use. Perception of emotional experiences in childhood as invalidating by parents is one factor that has been found to predict later alcohol use, though less is known about maternal invalidation specifically. Parental invalidation has also been found to predict difficulty regulating affective states (i.e., negative and positive affect), which is also a determinant of alcohol use. Further, researchers have studied temptation to drink and restraint from drinking as related to alcohol use to better understand drinking behavior. Though there appears …

Using Covers And Wetting Agents To Prevent Winter Injury Of Ultradwarf Bermudagrass, Eric Deboer

Graduate Theses and Dissertations

As ultradwarf bermudagrass (Cynodon dactylon (L.) Pers. × C. transvaalensis Burtt-Davy) putting green use in the United States moves further north, there is risk of sustaining winter injury from low-temperature exposure and tissue desiccation. Protective covers reduce low-temperature exposure on ultradwarf bermudagrass greens. Desiccation of turf can be caused by hydrophobic soils. Wetting agents are applied to actively growing ultradwarf bermudagrass greens to relieve symptoms of hydrophobic soils. Less is known about the effects late-fall wetting agent applications on dormant bermudagrass putting greens. This research aims to define a predicted low-temperature threshold for covering ultradwarf bermudagrass greens and to quantify …

Behavior Coding Strategies: Population Coupling And The Functional Role Of Excitatory/Inhibitory Balance In Primary Motor Cortex, Patrick Aaron Kells

Graduate Theses and Dissertations

The complexities of an organism’s experience of- and interaction with the world are emergent phenomena produced by large populations of neurons within the cerebral cortex and other brain regions. The network dynamics of these populations have been shown to be sometimes synchronous, with many neurons firing together, and sometimes asynchronous, with neurons firing more independently, leading to a decades-old debate within the neuroscience community. This discrepancy comes from viewing the system at two different scales; at the single cell level, the spiking activity of two neurons within cortex tend to be rather independent, but when the average activity of a …

How Want Vs Need Self-Talk Facilitates Goal-Directed Behavior, Danielle Elyse Baker

Graduate Theses and Dissertations

Exercising self-control can be a challenge, whether it involves avoiding temptations or striving toward long-term goals. When attempting to exert self-control, the way people address themselves (e.g., self-talk) is important. This study examined how self-talk strategies want and need affected behavioral self-control outcomes in a temptation situation using a 2 (self-talk strategy: want vs need) x 2 (goal emphasis: temptation vs long term goal) factorial design. Participants’ own cell phones served as the temptation and a computer task designed to portray a career-relevant emotional intelligence training served as the long-term goal. Participants were randomly assigned toward either the long-term goal …

Principal Engagement In The Professional Development Process: The Identification Of Barriers, Resources, And Supports, Michael John Koonce

Graduate Theses and Dissertations

The purpose of this study was to identify factors that served as barriers to principal engagement in the professional development process and identify what resources or supports were needed to increase engagement levels. For the purpose of this study, the professional development process included the identification of the professional learning needs of teachers on an ongoing and annual basis and the evaluation of the effectiveness of the professional development that has been provided. This study used a qualitative approach to examine principal engagement in the professional development process throughout a large geographic area in the Midwest. 20 principals were purposefully …

Mitochondrial Mrna Translation Is Required For Maintenance Of Oxidative Capacity, David Lee

Graduate Theses and Dissertations

Oxidative metabolism is required to produce adequate energy to sustain human life. A primary example of deteriorating oxidative capacity is seen in the cardiac musculature during chronic heart failure. This suggests that by improving oxidative potential, chronic heart disease could be mitigated and one approach to accomplish this may be through targeting the mt-mRNA translation system. Purpose: This investigation’s purpose was to characterize disruptions in mt-mRNA translation machinery in multiple forms of cardiomyopathy and to determine if mitochondrial mRNA translation initiation factor (mtIF2) is necessary to maintain oxidative capacity in cardiomyocytes. Methods Using a combination of animal and cell culture …

Interpretation And Fracture Characterization Of Early-Cretaceous Buda Limestone Formation Using Post-Stack 3d Seismic Data In Zavala County, Texas, Andrey Smirnov

Graduate Theses and Dissertations

The Buda Limestone is a naturally fractured Early Cretaceous carbonate formation in south Texas which unconformably underlies the Eagle Ford Shale. Matrix porosity of the Buda is less than 6%, therefore natural fractures improve the potential for commercial hydrocarbon production from this tight limestone formation. This presents a challenge for producers to identify these zones using well log and post stack 3D seismic data typically available to medium or small exploration companies. This project provides a workflow based on well log analysis tied to seismic acoustic impedance (AI) inversion to locate areas of probable natural fractures. Acoustic impedance inversion was …

A Phenomenological Inquiry Into The Shared Lived Experience Of Married Male Doctoral Students In Counselor Education And Their Non-Student Spouses, Anthony Suarez

Graduate Theses and Dissertations

Research involving married doctoral students has suggested that they face a unique set of circumstances that include benefits, challenges, and changes. Additional research has highlighted the culture within Counselor Education and Supervision (CES) programs. While there are some studies that explore the experiences of married graduate students in counseling-related fields, very little literature exists that explores married students in CES programs. No such studies focus on the experiences of married male students in CES.

The purpose of this study was to explore the shared lived experiences of married male doctoral students in Counselor Education and Supervision (CES) programs and their …

A Genome Wide Association Study For Fusarium Head Blight Resistance In Southern Soft Red Winter Wheat, Amanda Holder

Graduate Theses and Dissertations

Fusarium head blight (FHB) is a disease of small grains caused by the fungal pathogen Fusarium graminearum. FHB poses potential economic losses and health risks due to the accumulation of the mycotoxin deoxynivalenol (DON) on infected seed heads. The objectives of this study are: 1) evaluate soft red winter wheat (SRWW) lines for resistance to FHB in terms of resistance to initial inoculum (incidence); resistance to spread within the head (severity); resistance to DON accumulation; and resistance to Fusarium damaged kernels (FDK), 2) determine the frequency and effect of known FHB resistance genes and quantitative trait loci (QTL), and 3) …

The Perceived Effectiveness Of One-To-One Technology In Smallwood High School, Jason Michael Clemensen

Graduate Theses and Dissertations

Administrator, teacher, and student perceptions of one-to-one technology were studied in a single case study approach at one rural Midwest high school. Interviews were conducted with six teachers, two administrators, and a survey was given to 185 student participants. The data collected indicated that while participants perceived success with the one-to-one initiative, there were differing opinions on why they perceived the one-to-one initiative to be successful. Teacher and administrator participants discussed implementation strategies, professional development, community and parent involvement, and pedagogical changes in teaching practice. The student participant survey was designed around student perceptions of one-to-one technology and teacher usage …

Soil Properties That Influence The Occurrence Of Hydrogen Sulfide Toxicity In Rice Fields, Julia Marie Fryer

Graduate Theses and Dissertations

Rice (Oryza sativa L.) producers face many challenges throughout each growing season. Hydrogen sulfide (H2S) toxicity is a physiological disorder where sulfate (SO42-) is excessively reduced to the toxic gas, H2S. This can reduce yield and, in severe cases, result in crop death. The main research objectives were to: i) understand chemical and physical characteristics in soils prone to H2S toxicity, ii) determine influential soil characteristics on the incidence of H2S toxicity, iii) determine ammonium sulfate ((NH4)2SO4) fertilizer additions influence on H2S toxicity, and iv) predict when and where H2S will occur. Three greenhouse experiments were conducted using Arkansas field …

Design, Fabrication, And Characterization Of Novel Optoelectronic Devices For Near-Infrared Detection, Ahmad Nusir

Graduate Theses and Dissertations

Investigating semiconductor materials and devices at the nanoscale has become crucial in order to maintain the exponential development in today’s technology. There is a critical need for making devices lower in power consumption and smaller in size. Nanoscale semiconductor materials provide a powerful platform for optoelectronic device engineers. They own interesting properties which include enhanced photoconductivity and size-tunable interband transitions.

In this research, different types of nanostructures were investigated for optoelectronic devices: nanocrystals, nanowires, and thin-films. First, lead selenide nanocrystals with narrow bandgap were synthesized, size-tailored, and functionalized with molecular ligands for the application of uncooled near-infrared photodetectors. The devices …

The Attitudes Of Saudi Teachers Toward Teaching Physical Education For Girls At Public Schools In Jeddah, Turki H. Samargandi

Graduate Theses and Dissertations

The purpose of this study was to investigate the attitudes of Saudi teachers towards teaching PE for girls at public schools in Jeddah city and to explore the factors that may affect these attitudes. The researcher explored the reasons behind the PE ban for girls in these schools. The number of participants was Four hundred and sixty-two teachers who completed the survey (N = 462). T-Test and One-Way ANNOVA were the two methods to analyze the data collected.

The results indicated that about 95.1% of them agreed that regular practice of physical education can affect positively the appearance and the …

Community- Versus School-Based Mentoring Matches: Do Mentees’ Parents Differ In Family Risk, Perceived Support Or Reasons For A Mentor?, Meredith Sourk

Graduate Theses and Dissertations

This study explores whether the parents or guardians of youth participating in community-based (CBM) and school-based (SBM) mentoring programs differ in their level of family stress, economic adversity and perceived social and community support. Participants were 131 parents of youth in either CBM (n = 79) or SBM (n = 52) programs sponsored by Big Brothers Big Sisters of Canada (BBBS-Canada). Parents completed an online survey that assessed demographic characteristics and involvement in BBBS-C programs. Additional measures assessed family stress, economic adversity, perceived support (interpersonal, community), and reasons for wanting a mentor. Parents of youth in CBM matches were less …

Teacher And Administrator Perceptions Of The Teacher Excellence And Support System (Tess) In Arkansas, Allison Louise Byford

Graduate Theses and Dissertations

The purpose of this study was to investigate differences in Arkansas teachers’ and building-level administrators’ perceptions regarding the purpose of the Arkansas TESS teacher evaluation system, whether TESS authentically assesses teacher effectiveness, how teacher evaluation data are used, and how the TESS process supports learner-centered professional development. Additionally, the relationship of teacher and administrator demographics on their perceptions of TESS was explored. The results of this study highlight the differences in perceptions in all areas questioned along with misalignment in perceptions among teachers. Overall, the study points toward the need for clear communication and the cultivation of relationships among building …

A Case Study Of The Umpqua Community College Shooting, Timothy P. Wilson

Graduate Theses and Dissertations

The purpose of this dissertation was to examine the deadliest shooting that has happened on a community college campus. The following research questions guided this dissertation study: (1) What was the law enforcement response to the deadliest community college campus shooting in history? (2) Did previous mass shootings inform the law enforcement response to the deadliest community college campus shooting? (3) What implications for practice can be derived by studying the deadliest of these shootings? This case study utilized multiple sources of information, from official police reports, official institutional reports, archives of publications, and participant interviews from some of the …

Tapping The Voices Of Learners For Authentic Student Engagement, Bryan Bronn

Graduate Theses and Dissertations

The purpose of this study was to examine the problem of practice of the decline in student engagement from the perceptions of secondary school learners as they proceed throughout their educational experience. According to researchers, learners who are engaged—meaning those who are committed and connected in active relationships with teachers, other learners, the learning environment, learning interests and ideas, the curriculum, and learning goals, are more likely to enjoy and be in control of their own learning [student agency]. This study is significant because of its potential to provide new understandings of the problem of a decline in student engagement …

From The Tartan Tories To Scotland’S Social Democrats: The Remaking Of The Scottish National Party, Natalie Jayne Mauchline

Graduate Theses and Dissertations

The United Kingdom is entering a period of great uncertainty, with the future of Scotland’s membership still in question. Following personal work experience in the Scottish Parliament, it became apparent to me that the Scottish National Party currently finds itself in a unique position. By utilizing constituency maps, this study will trace the evolution of the Scottish National Party (SNP) and explore how its changing nature allowed it to grow from a minute populist group seeking independence to a social justice party hoping to appeal to a more diverse group of voters by increasing credibility at the local level and …

The Effectiveness Of The Three-Module Job Training Intervention On Job Search Knowledge, Job Search Attitude Knowledge, And Job Survival/Maintenance Knowledge, Tris Middleton

Graduate Theses and Dissertations

The purpose of this study was to determine the effectiveness of the Three-Module Job Training Intervention on increasing job search knowledge, job search attitude knowledge, and job survival/maintenance knowledge. The Three-Module Job Training Intervention consists of Module I-Job Search Training (JST); Module II-Job Search Attitude Training (JSAT); and Module III-Job Survival and Maintenance Training (JSMT).

In this study, the researcher used three instruments to measure pre-training and post-training levels of job search knowledge, job search attitude knowledge, and job survival/maintenance knowledge. The Job Search Knowledge Scale (JSKS) measured the level of job search knowledge; the Job Search Attitude Inventory (JSAI) …

Combining Microdialysis And Electrophysiology In Cerebral Cortex To Delineate Functional Implications Of Acetylcholine Gradients, Tazima Nur

Graduate Theses and Dissertations

The neuronal network in cerebral cortex is a dynamic system that can undergo changes in collective neural activity as the organism changes its behavior. For example, during sleep and quiet restful awake state, many neurons tend to fire together in synchrony. In contrast, during alert awake states, firing patterns of neurons tend to be more asynchronous, firing more independently. These changes in population-level synchrony are defined as changes in cortical state. Response to sensory input is state-dependent, i.e., change in cortical state can impact the sensory information processing in cortex and introduce trial-to-trial variability in response to the same repeated …

The Role Of Co2 Sublimation In Mass Wasting And Landscape Evolution Under Martian Conditions, Matthew Edwin Sylvest

Graduate Theses and Dissertations

Here we present the first set of laboratory experiments under martian atmospheric conditions which demonstrate that the sublimation of CO2 ice from within the sediment body can trigger failure of unconsolidated, regolith slopes, and can measurably alter the landscape. Previous theoretical studies required CO2 slab ice for movements, but we find that only frost is required. Hence, sediment transport by CO2 sublimation could be more widely applicable (in space and time) on Mars than previously thought. This supports recent work suggesting CO2 sublimation could be responsible for recent modification in martian gullies.

A second set of experiments were carried out …