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Economic Analysis Of Solar Investment In An Agricultural Setting, Morgan King Dec 2023

Economic Analysis Of Solar Investment In An Agricultural Setting, Morgan King

Graduate Theses and Dissertations

Robust financial modelling is critical for evaluating solar investments in agricultural applications. Agricultural producers with electricity-intensive systems (especially poultry houses but also, for example, irrigation pumps) face monthly electricity bills in the thousands of dollars. Further, volatile electricity bills, because of uncertain electric rate inflation, add to financial risk as utility costs make up a large portion of operating costs. While solar panels reduce input cost risk with certain installation cost up front, producers are hesitant to invest given long payback periods, uncertainty about the future of net metering, and high financial leverage. To enable producers to accurately assess the …


A Study Of Latino Undergraduate Students In Retention Cohorts At The University Of Arkansas, Ramon Balderas Dec 2023

A Study Of Latino Undergraduate Students In Retention Cohorts At The University Of Arkansas, Ramon Balderas

Graduate Theses and Dissertations

Higher education institutions do not have a history of being racially inclusive, and as a result, research and best practices around retention and student success have not been developed for underrepresented and minoritized students. Although there has been a surge in scholarship on diversifying higher education, literature, and identifying best practices focused on retaining students there is less research and literature that looks at Latino students. The study's purpose was to better understand Latino undergraduate student retention patterns at the University of Arkansas, a midwestern public four-year research university. The significance of the study was to assist UA administrators and …


Social Media Impacts On Arkansas Consumer Perceptions Of Gmos, Elizabeth R. Berner Dec 2023

Social Media Impacts On Arkansas Consumer Perceptions Of Gmos, Elizabeth R. Berner

Graduate Theses and Dissertations

This study builds upon previous consumer perceptions of GMOs studies. A need existed to determine what, if any, effects social media messages about GMOs had on consumer perceptions in Arkansas. The study utilized a qualitative approach with three focus groups. Data were analyzed using descriptive code. Participants were found to have a general understanding of GMOs, though discussion about what a GMO product was took an uncertain tone. Most participants did not consider GMOs as a factor when purchasing products. Rather participants considered characteristics such as price, quality, and convenience. Participants did not believe the infographics had changed their opinions …


Analyses Of Effect Indices Across Single-Case Research Designs In Counseling, Cian L. Brown Dec 2023

Analyses Of Effect Indices Across Single-Case Research Designs In Counseling, Cian L. Brown

Graduate Theses and Dissertations

Single case research design (SCRD) is a common methodology used across clinical disciplines to determine treatments effectiveness by comparing treatment conditions to baseline conditions in individual cases, usually among researchers working with smaller samples. Although popular within behavioral disciplines such as special education and behavioral analysis, studies have begun to emerge in counseling. However, guidance and current understanding of the use of SCRD in counseling is limited. A content analysis of counseling journals from 2003 to 2014 yielded only 7 studies using SCRD. In 2015, the flagship counseling journal, Journal of Counseling and Development, published a special issue on the …


Assessment Of Needs And Priorities For Precision Agriculture And Soil Testing In Arkansas, Solomon Frimpong Dec 2023

Assessment Of Needs And Priorities For Precision Agriculture And Soil Testing In Arkansas, Solomon Frimpong

Graduate Theses and Dissertations

Optimum crop production is needed to meet the growing population's food, water, fiber, and energy needs. However, agricultural productivity is hampered by many destabilizing factors such as pest management challenges, declining water quantity, and climate change which threaten long-term food security. Maximizing productivity will require optimizing resources through Precision Agriculture (PA) by supplying inputs based on crop needs. Precision Agriculture offers tools that can be used to optimize crop management practices globally. However, stakeholders’ perceptions and the lack of data-driven site-specific recommendations limit stakeholders’ ability to fully harness the potential benefits of PA. Identification of stakeholder needs and approaches to …


Characterization Of Human Fibroblast Growth Factor 2 Variant To Determine Effects On Structure, Stability, And Cell Proliferation, Ryan Layes Dec 2023

Characterization Of Human Fibroblast Growth Factor 2 Variant To Determine Effects On Structure, Stability, And Cell Proliferation, Ryan Layes

Graduate Theses and Dissertations

Fibroblast growth factors (FGFs) are a family of cell signaling proteins conserved across multiple species. Each individual FGF elicits different cellular functions including, but not limited to, proliferation, migration, differentiation, angiogenesis, and wound healing. One of the most studied members, fibroblast growth factor 2 (FGF2), has demonstrated substantial wound healing capacity in a wide range of tissues including skeletal, muscular, neural, respiratory, epithelial, and cardiovascular. This ability makes FGF2 a potential therapeutic for a wide range of conditions and injuries. However, due to a short half-life at room temperature, therapeutic use of FGF2 is limited. It has been demonstrated that …


Analyzing The Adoption, Cropping Rotation, And Impact Of Winter Cover Crops In The Mississippi Alluvial Plain (Map) Region Through Remote Sensing Technologies, Zobaer Ahmed Aug 2023

Analyzing The Adoption, Cropping Rotation, And Impact Of Winter Cover Crops In The Mississippi Alluvial Plain (Map) Region Through Remote Sensing Technologies, Zobaer Ahmed

Graduate Theses and Dissertations

This dissertation explores the application of remote sensing technologies in conservation agriculture, specifically focusing on identifying and mapping winter cover crops and assessing voluntary cover crop adoption and cropping patterns in the Arkansas portion of the Mississippi Alluvial Plain (MAP). In the first chapter, a systematic review using the PRISMA methodology examines the last 30 years of thematic research, development, and trends in remote sensing applied to conservation agriculture from a global perspective. The review uncovers a growing interest in remote sensing-based research in conservation agriculture and emphasizes the necessity for further studies dedicated to conservation practices. Among the 68 …


The Effect Of Symbioses Between Mold Mites (Acaridae: Tyrophagus Putrescentiae) And Aspergillus Flavus On Their Respective Populations In Stored Maize., Paige Pionke Cummins Aug 2023

The Effect Of Symbioses Between Mold Mites (Acaridae: Tyrophagus Putrescentiae) And Aspergillus Flavus On Their Respective Populations In Stored Maize., Paige Pionke Cummins

Graduate Theses and Dissertations

Zea mays is the most commonly grown grain in the world and is used for animal feed, human consumption, and the creation of other products such as ethanol and bioplastics. Contamination of stored maize with stored grain invaders can lead to loss of revenue, reduced food availability, and potential health complications. Two such storage invaders; the mold mite Tyrophagus putrescentiae and the fungus Aspergillus flavus can work as symbionts within the grain storage system. To determine resulting population growth from this symbiosis, maize was inoculated with three treatments: A. flavus with no mites, T. putrescentiae with no fungus, and both …


Development And Use Of A Detached Leaf Assay To Assess Soybean Cultivar Resistance To Target Spot, Caused By Corynespora Cassiicola, Rachael Wolf Aug 2023

Development And Use Of A Detached Leaf Assay To Assess Soybean Cultivar Resistance To Target Spot, Caused By Corynespora Cassiicola, Rachael Wolf

Graduate Theses and Dissertations

Target spot, caused by the fungus Corynespora cassiicola, was once considered a minor foliar disease of soybean in the US. However, a severe outbreak of target spot occurred in the southeastern U.S in 2016. Due to the lack of information on resistance in soybean cultivars, and the challenges in screening cultivars in the field, a detached leaf assay was developed to evaluate resistance. The objectives of the effort were to 1) develop a greenhouse inoculation method of soybean with C. cassiicola 2) use that method to compare reactions of soybean germplasm lines to target spot 3) collect and characterize isolates …


Determinants Of Market Participation Among Milk Producers In Kyrgyzstan, Akhmadjon Nurullaev Aug 2023

Determinants Of Market Participation Among Milk Producers In Kyrgyzstan, Akhmadjon Nurullaev

Graduate Theses and Dissertations

This study explores the key factors that drive milk producers to enter the milk market as sellers in Kyrgyzstan. The study utilizes the Life in Kyrgyzstan dataset, a nationally representative survey that tracks 3,000 households and 8,000 individuals throughout Kyrgyzstan. The results were analyzed with two different models: Heckman’s two-stage and the double hurdle models. The results show that regional location, ethnic group origin, risk awareness, dependency ratio, vehicle ownership, total value of assets, distance to agro market, and family shock occurrence significantly impact both market participation and the volume of milk sales. The findings hold great significance in establishing …


Explicit And Implicit Measurements Of Sensory And Emotional Responses To Stimuli In Children With Autism Spectrum Disorder, Asmita Singh Aug 2023

Explicit And Implicit Measurements Of Sensory And Emotional Responses To Stimuli In Children With Autism Spectrum Disorder, Asmita Singh

Graduate Theses and Dissertations

Autism Spectrum Disorder (ASD) is a developmental disability that causes significant social, communication, and behavioral challenges and it is often involved in sensory processing issues that lead to feeding problems. While our understanding of how sensory responses differ in people with ASD is limited, past studies indicated atypical responses to certain stimuli. If these stimuli can be identified, they could be good indicators to identify the risk of autism in young children. The main objective of this dissertation was to identify a specific stimulus leading autistic children to exhibit atypical responses in terms of sensory or emotional aspects. Children between …


Short-Term Response In Soil Health To Management Practices Within Large- And Small-Scale Cropping Systems In Arkansas, Torri Holder Aug 2023

Short-Term Response In Soil Health To Management Practices Within Large- And Small-Scale Cropping Systems In Arkansas, Torri Holder

Graduate Theses and Dissertations

Improving soil health is a growing area of interest within large- and small-scale agricultural systems in Arkansas as producers face increasing input costs, increased awareness of variability and intensity in extreme weather events, decreasing resource availability, and suboptimal productivity related to environmental degradation. Practices aimed at improving soil health such as cover cropping and the use of organic amendments are increasingly recommended and adopted; however, research on optimal management in the Mid-South is lacking. Two studies were conducted to evaluate the effectiveness of soil health management under both small- and large-scale farming operations in Arkansas. The objective of the small-scale …


An Exploration Of Saudi Women’S Experiences And Perceptions Towards Participation In Physical Activity And Sports In The United States, Ahmed H. Sumayli Aug 2023

An Exploration Of Saudi Women’S Experiences And Perceptions Towards Participation In Physical Activity And Sports In The United States, Ahmed H. Sumayli

Graduate Theses and Dissertations

A significant proportion of Saudi women are currently living in different Western countries, including the United States of America. Physical activity and sports participation play a significant role in maintaining health and well-being for all individuals. Understanding their physical activity experiences and perceptions regarding participation in sports activity during their stay in the United States is important. This study aimed to understand if the length of residence in the United States and/or acculturation to the U.S. environment could significantly change Saudi women's patterns, attitudes, and behaviors towards sports and fitness activities. This qualitative study was carried out to explore and …


Enhancing Depression Screening And Treatment For Latinxs Residing In The U.S., Linda Esperanza Guzman Aug 2023

Enhancing Depression Screening And Treatment For Latinxs Residing In The U.S., Linda Esperanza Guzman

Graduate Theses and Dissertations

Introduction: In the U.S., Latinxs with Spanish as their preferred language encounter two prominent structural barriers impacting access to treatment for major depressive disorder (MDD). The first is that MDD symptoms commonly go undetected in Latinxs with Spanish compared to English as their preferred language. This might be perhaps because commonly used MDD screeners lack somatic symptom survey items culturally specific in how MDD may present among Latinxs with Spanish as their preferred language. The second structural barrier is that treatment access and completion rates are lower in Spanish-speaking than English-speaking Latinxs, perhaps due to treatments lacking the structure and …


Investigation Of Chinese Students’ Writing Perceptions At An English Young Writers Camp, Jingshu Chen Aug 2023

Investigation Of Chinese Students’ Writing Perceptions At An English Young Writers Camp, Jingshu Chen

Graduate Theses and Dissertations

This study explores how a young writers camp that catered to 40 Chinese English as a Foreign Language (EFL) learners, ranging from students entering the fourth grade to seventh grade, mediated the students’ writing perceptions. More specifically, the main objective of this research was to investigate the impact of the camp on the students' perceptions of writing and their self-identification as writers. The study employed the theoretical framework of Cultural Historical Activity Theory to guide the analysis. Various types of data were collected from the 40 participating students, including pre- and post-camp survey questions, classroom observations, and open-ended interviews. By …


Achieving High Renewable Energy Integration In Smart Grids With Machine Learning, Yaze Li Aug 2023

Achieving High Renewable Energy Integration In Smart Grids With Machine Learning, Yaze Li

Graduate Theses and Dissertations

The integration of high levels of renewable energy into smart grids is crucial for achieving a sustainable and efficient energy infrastructure. However, this integration presents significant technical and operational challenges due to the intermittent nature and inherent uncertainty of renewable energy sources (RES). Therefore, the energy storage system (ESS) has always been bound to renewable energy, and its charge and discharge control has become an important part of the integration. The addition of RES and ESS comes with their complex control, communication, and monitor capabilities, which also makes the grid more vulnerable to attacks, brings new challenges to the cybersecurity. …


Photon Counting Statistics Of Classical And Quantum Light Sources, Luis Felipe Morales Bultron Aug 2023

Photon Counting Statistics Of Classical And Quantum Light Sources, Luis Felipe Morales Bultron

Graduate Theses and Dissertations

Multiple sources of light, including coherent light, thermal light, light from a degenerate parametric oscillation and resonance fluorescence from a two level coherently driven atom are considered for the analysis of their wait time statistics. We include the second order normalized correlation function and Mandel's Q parameter for brief discussion. A general framework to analyze the generalized conditional and unconditional wait time distributions is also obtained in order to understand the photo-count statistics of the light sources included in this work. Average and variance of wait times with respect to both unconditional and conditional wait time distribution are also obtained …


Commonalities In Evidence-Based Instructional Strategies For Autism Spectrum Disorder And English Language Learners, Kimberly Michelle O'Mara Aug 2023

Commonalities In Evidence-Based Instructional Strategies For Autism Spectrum Disorder And English Language Learners, Kimberly Michelle O'Mara

Graduate Theses and Dissertations

Many English language learners experience life on the Autism spectrum. These students will spend much of their day in the general education setting, and teachers will need effective and proven strategies to support them. The data show that Autism Spectrum Disorder is increasing among all populations (CDC, 2023). Current understandings and influences on these learners will be explored. This review examines evidence-based practices presented by premier sources in the fields of Autism Spectrum Disorder and English language learning, seeking commonalities in strategies. Using the findings from the National Standards Report and the National Clearinghouse for Autism Evidence & Practice cross-referenced …


Examining The Perceived Implications Of Eliminating The Stem Career Cluster In Kansas, Trevor Maiseroulle Aug 2023

Examining The Perceived Implications Of Eliminating The Stem Career Cluster In Kansas, Trevor Maiseroulle

Graduate Theses and Dissertations

Career and technical education (CTE) has been an effort in the United States to help bring quality career preparation programs to secondary schools nationwide, with many career clusters allowing schools to teach various courses. For example, the science, technology, engineering, and mathematics (STEM) career cluster provides interdisciplinary approaches and hands-on activities to help students succeed in postsecondary ventures. One of the integral subjects in STEM education is technology and engineering education (T&EE), which has been synonymous with STEM education for decades. T&EE is a discipline which has been around for over a century, nevertheless it may be confused with CTE. …


Bio-Methane Production From Anaerobic Co-Digestion Of Poultry Litter With Wheat Straw Improved By Process Optimization And Employment Of Advanced Techniques, Yuanhang Zhan Aug 2023

Bio-Methane Production From Anaerobic Co-Digestion Of Poultry Litter With Wheat Straw Improved By Process Optimization And Employment Of Advanced Techniques, Yuanhang Zhan

Graduate Theses and Dissertations

Anaerobic co-digestion (Co-AD) of poultry litter (PL) and wheat straw (WS) for sustainable waste management and simultaneously renewable bioenergy generation was improved by advanced technologies including micro-aeration (MA), biochar addition (BC), nanoparticles supplementation (NP) and their integrations. Response surface methodology (RSM) and artificial neural network (ANN) were used for the process modeling and optimization. First, a method by gradually increasing OLR was developed for the start-up of Co-AD of PL and WS in an anaerobic sequencing batch reactor (ASBR), with a continuous daily biogas production of (13.06 ± 0.21) L and methane content (MC) of (54.38 ± 0.53) % observed. …


Investigating And Characterizing Septin Cellular Regulators During Infection Related Development In M. Oryzae, Rinalda Proko Aug 2023

Investigating And Characterizing Septin Cellular Regulators During Infection Related Development In M. Oryzae, Rinalda Proko

Graduate Theses and Dissertations

The fungus Magnaporthe oryzae causes a devastating disease of rice and wheat, called blast, which poses a major threat to food security across the planet. To enter plant tissue, M. oryzae produces a remarkable pressure-generating infection cell called an appressorium, which mechanically ruptures the tough cuticle of host leaves through the application of enormous physical force directed onto a narrow penetration structure emerging from its base. Importantly, appressorium form and functionality depends on the regulated assembly of a toroidal ring-like structure, composed of septins, which forms within its base. Septins are a family of membrane-associated GTP-binding proteins that polymerize into …


Who Sings And Who Falls Silent? A Spatial And Social Analysis Of Virgilian Graffiti In Pompeii, Rachel Murray Aug 2023

Who Sings And Who Falls Silent? A Spatial And Social Analysis Of Virgilian Graffiti In Pompeii, Rachel Murray

Graduate Theses and Dissertations

This study analyzes Pompeian domestic spaces in which graffiti that quote the works of Virgil have been found. This is particularly compelling because of the Aeneid’s status as a ‘national epic,’ simultaneously ‘high’ culture and seemingly part of the ‘common’ imagination. In the past scholars have argued that the presence of Virgilian graffiti was not indicative of widespread interaction with Virgil, and that a select few individuals were responsible for these quotations. Drawing from ideas proposed by modern graffiti studies and spatial theorists and employing the methodology developed by the Virtual Pompeii Project, this study uses network analysis measures to …


Double-Sided Cooled Power Modules For Electric Vehicles, Riya Paul Aug 2023

Double-Sided Cooled Power Modules For Electric Vehicles, Riya Paul

Graduate Theses and Dissertations

Double-sided cooled (DSC) power modules in conjunction with Silicon Carbide (SiC) power devices are expected to significantly elevate the performance of the next-generation electric vehicle power inverters. The double-sided cooling enables maximum heat dissipation, resulting in higher power density. SiC power devices, with their fast-switching speeds, reduce the power losses for higher efficiency. A half-bridge power module consisting of 13 mΩ 1.2 kV SiC devices is used for this work. A baseline DSC power module was designed, fabricated, and tested. This unique design uses truncated rectangular copper connection blocks for better heat dissipation from the device top side compared to …


Components Of Emotional Functioning Among People With Substance Use And Posttraumatic Stress Difficulties: An Idiographic Perspective, Danielle Higuera Aug 2023

Components Of Emotional Functioning Among People With Substance Use And Posttraumatic Stress Difficulties: An Idiographic Perspective, Danielle Higuera

Graduate Theses and Dissertations

Prior research has examined components of emotional functioning (e.g., clarity, physiological sensations, expression, regulation) among people with substance use and/or posttraumatic stress at the group level; however, a more cohesive/comprehensive understanding of how these factors unfold and connect for individual people who comprise these populations is needed. The current study used a qualitative interview design to explore the emotional worlds of participants (N = 44) who comprised four groups (substance use [n ¬= 11], posttraumatic stress [n = 12], co-occurring substance use and posttraumatic stress [n = 11], and healthy controls [n = 10]) to gain a person-level understanding of …


Screening A Set Of Tomato Genotypes For Resistance To Bacterial Wilt And A Genomic Wide Association Study And Genomic Prediction For Yield-Related Traits In ‘Lcp 85-384’. I. Sugarcane, Theresa Makawa Phiri Aug 2023

Screening A Set Of Tomato Genotypes For Resistance To Bacterial Wilt And A Genomic Wide Association Study And Genomic Prediction For Yield-Related Traits In ‘Lcp 85-384’. I. Sugarcane, Theresa Makawa Phiri

Graduate Theses and Dissertations

This thesis comprises two studies that focused on screening tomato genotypes for bacterial wilt resistance and a genome-wide association study and genomic prediction for yield-related traits in sugarcane with the aim of contributing to the breeding programs. In the first chapter, 40 tomato accessions from the USDA collection were evaluated for their resistance to Ralstonia solanacearum isolate P822 under controlled greenhouse conditions. The plants were inoculated, and disease symptoms were visually assessed. Disease severity was rated on a scale of 0 to 4, where 0 represented no wilting and 4 indicated complete leaf wilting. Among the tested accessions, five (PI …


The Economic Effects Of Covid-19 On Smallholder Farmers In Kenya, Sarah Hope Brasche Aug 2023

The Economic Effects Of Covid-19 On Smallholder Farmers In Kenya, Sarah Hope Brasche

Graduate Theses and Dissertations

Like many Sub-Saharan African countries, the Kenyan economy heavily relies on agriculture. Agriculture in Kenya accounted for 50% of the total workforce in 2019 and 70% of the rural workforce. Though reliant on agriculture for employment and subsistence, Kenya has been historically impoverished and malnourished. Kenya has been experiencing an economic recession since 2018, which was exacerbated by the COVID-19 pandemic. Relatively speaking to other African countries, Kenya managed to escape the worst health effects of the pandemic, but the economic effects were substantial. This study analyzes survey responses from 1,059 Kenyan smallholder agricultural producers on the economic impacts they …


Understanding The Environmental And Genetic Influence On Fluctuating Asymmetry And Developmental Instability In Primates, Ashly N. Romero Aug 2023

Understanding The Environmental And Genetic Influence On Fluctuating Asymmetry And Developmental Instability In Primates, Ashly N. Romero

Graduate Theses and Dissertations

This dissertation explored the impact of environmental factors on the development and perpetuation of fluctuating asymmetry (FA) and sought to understand the role evolution may play in the FA exhibited in two primate populations: the free-ranging Cayo Santiago rhesus macaques (Macaca mulatta) and the Southwest National Primate Research Center olive baboons (Papio hamadryas anubis). Demographic, ontogenetic, secular, external, and genetic factors were examined. Specifically, this dissertation investigated FA over all ontogenetic stages, across decades, between sexes, in association with ecological catastrophes, and with tooth pathology to try and tease apart factors that may influence FA and developmental instability. This dissertation …


Characterizing Logistics Operations Within A Federal Staging Area For Hurricane Response: A Qualitative Analysis Of Federal, State And Local Perspectives, Jannatul Shefa Aug 2023

Characterizing Logistics Operations Within A Federal Staging Area For Hurricane Response: A Qualitative Analysis Of Federal, State And Local Perspectives, Jannatul Shefa

Graduate Theses and Dissertations

A successful deployment of logistics operations following a disaster is a collective contribution of federal, state, and local entities to ascertain an efficient and effective response. This research analyzes data from interviews with disaster response logistics experts from these entities. The objective is to investigate the information sources and planning processes used in these organizations to plan vehicle routes for critical resource deliveries to impacted areas. Special attention is directed to the impacts of incomplete knowledge of infrastructure status, such as road disruptions due to debris or flooding. Supported by both qualitative and quantitative evidence, the study finds that incomplete …


Hedda Is All Of Us. On Directing Henrik Ibsen’S Hedda Gabler, Laura Catherine Post Aug 2023

Hedda Is All Of Us. On Directing Henrik Ibsen’S Hedda Gabler, Laura Catherine Post

Graduate Theses and Dissertations

This paper aims to document the process of directing Henrik Ibsen’s 1890 play Hedda Gabler at the University of Arkansas in February 2023. The chapters include the script selection process, translation selection process, casting, text analysis, research, design process, rehearsal process, and production evaluation.


Seeking And Providing Social Support In Online Forums For Individuals Experiencing Depression, Anna Gentry Aug 2023

Seeking And Providing Social Support In Online Forums For Individuals Experiencing Depression, Anna Gentry

Graduate Theses and Dissertations

This thesis project investigates how individuals suffering from depression seek support, provide support, and describe experiences of stigma in an online support platform. A phronetic-iterative and constant comparative approach guided an in-depth analysis of 37 posts on a discussion board designed for individuals with depression. The findings demonstrated that individuals use online discussion forums to request support both implicitly and explicitly. In response to sought support, individuals provided informational, emotional, and network support. Finally, discussion board participants discussed social and self stigma. Despite the limitations of the study, the findings indicate the utility of online social support platforms for individuals …