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Dream Border, Pardis Ahmadpour Mobarake
Dream Border, Pardis Ahmadpour Mobarake
Graduate Theses and Dissertations
Dream Border is the result of my lived experience of relocation. The exhibition addresses the duality of being on the border between reality and imagination. In this place, the present, past, and future exist simultaneously. By engaging with personal narratives, childhood memories, as well as Iranian cultural and literary visual elements, I search for universal concepts in relocation. These works evoke the imposition of power and the many phenomena that the contemporary world endures despite globalization, such as anxiety, fear, and oppression on a small or large scale, which compel people to relocate. Uncertainty in the process of migration and …
Evaluating Arkansas Weathering Steel Bridge Performance, Yessenia Gonzalez
Evaluating Arkansas Weathering Steel Bridge Performance, Yessenia Gonzalez
Graduate Theses and Dissertations
Weathering steel enhances corrosion-resistant steel features over conventional steel when a patina properly forms on the weathering steel surface. Weathering steel is a low carbon steel of less than 0.3% carbon by weight and has a chemical composition including other alloying elements such as nickel, copper, and chromium that develops a patina. The patina is a dense protective oxide film layer that develops on the steel member surface. The patina defends the steel from corrosion by preventing moisture, oxygen, and contaminant penetration. However, long periods of moisture and deicing chemicals applied during wet wintry conditions hinder proper patina formation. Without …
Interfacial Engineering Of Nickel-Rich Layered Oxide Cathodes Via Atomic Layer Deposition (Ald), Xin Wang
Interfacial Engineering Of Nickel-Rich Layered Oxide Cathodes Via Atomic Layer Deposition (Ald), Xin Wang
Graduate Theses and Dissertations
Layered nickel-rich cathodes LiNixMnyCozO2 (NMCs, x + y + z =1, x ≥ 0.6) are regarded as one of the most promising cathode materials for next-generation lithium-ion batteries (LIBs), given their remarkably reduced cost and increased capacity compared to the conventional LiCoO2 cathode. However, the deployment of these Ni-rich cathodes has been hindered by the continuous loss of practical capacity and reduction in average working voltage, inherently due to their interfacial, structural, and thermodynamic instability. To address these issues, interfacial engineering via surface modification has been well-recognized as an effective strategy and a large number of coating materials have been …
Improving Building Cfd Peak Pressure Computation Using Les With A Focus On Inflow Turbulence Methods And Grid Spacing Size., Zahra Mansouri
Improving Building Cfd Peak Pressure Computation Using Les With A Focus On Inflow Turbulence Methods And Grid Spacing Size., Zahra Mansouri
Graduate Theses and Dissertations
Structural failures by extreme winds often leads to economic losses and even deaths. Proper design of buildings requires accurate estimation of wind loads to prevent structural damage. Using routine guidelines generally leads to the underestimation of buildings’ peak pressures, in which most failures occur. To estimate wind loads more accurately three different methods (i.e., field measurement, wind tunnel (WT), and computational fluid dynamics (CFD)) are in use. A well-validated CFD provides more flow field details at lower costs compared to field measurements and WT. As strong winds are extremely turbulent, the effects of turbulence in wind should be incorporated into …
Sustainability And Health Impacts Of Pulse Crops In The United States Using Life Cycle Assessment, Prathamesh A. Bandekar
Sustainability And Health Impacts Of Pulse Crops In The United States Using Life Cycle Assessment, Prathamesh A. Bandekar
Graduate Theses and Dissertations
Environmental sustainability and human health impact of pulses produced and consumed in the United States was assessed using life cycle assessment (LCA). The study included three objectives 1) to estimate environmental impact of current production and consumption practices in the United States using attributional LCA; 2) to estimate environmental and human health impact of iso-caloric diets containing varying amounts of pulses using Hybrid-LCA and Combined Nutritional and Environmental-LCA (CONE-LCA); and 3) to estimate environmental impact of increased demand for pulses using consequential LCA. Scope of the study varied for each objective with system boundary encompassing cradle-to-grave activities for objective 1 …
First-Principles Study Of Doping Effects On Ferroelectricity And On Rashba Spin Splitting, Zegnet Yimer Muhammed
First-Principles Study Of Doping Effects On Ferroelectricity And On Rashba Spin Splitting, Zegnet Yimer Muhammed
Graduate Theses and Dissertations
In this dissertation, we have thoroughly studied the effect of chemical and charge dopingon ferroelectrics (PbTiO3 and BaTiO3) and Rashba type semiconductor (BiTeI). In the first project, We investigate the polar instability and soft modes in electron-doped PbTiO3 using linear-response density functional calculations. Because, metallicity and ferroelectric-like polar distortion are mutually non-compatible, and their coexistence in the same system is an intriguing subject of fundamental interest in the field of structure phase transition. However, it is unclear what mechanism may extend the limit of metallicity that allows polar distortion. We find that ferroelectric instability can remarkably sustain up to an …
In-Field And Greenhouse Assessments Of A Selection Of Preemergent Herbicides On Newly Planted Blackberries, Kayla Knepp
In-Field And Greenhouse Assessments Of A Selection Of Preemergent Herbicides On Newly Planted Blackberries, Kayla Knepp
Graduate Theses and Dissertations
This field trial assesses some of the preemergence herbicide options available to growers and their effect on newly transplanted blackberries (Rubus L. subgenus Rubus Watson). Weed control has recently been surveyed as a top priority for blackberry growers; however, limited preemergence herbicides are registered for new blackberry plantings. Weed control is an ongoing component of blackberry production and with few in-season postemergence herbicide options available, growers rely on preemergence herbicides to maintain clean fields. The preemergent herbicides assessed in this trial were chosen with the intention to broaden the chemical control options available to growers in new plantings. A two-year …
The Human Natural Resource Endowment Of Limestone For Cement Manufacturing, Vanya Marie North
The Human Natural Resource Endowment Of Limestone For Cement Manufacturing, Vanya Marie North
Graduate Theses and Dissertations
This study investigates the total per-capita allocation of limestone globally. Termed the Human Natural Resource Endowment (HNRE), it is calculated by subtracting the cumulative annual production from the ultimately recoverable reserve (URR) of limestone and dividing the difference by global population. HNRE represents a unique way of visualizing resource depletion by asking how much of a given resource can be allocated to each person on earth, and how long that allocation can last given multiple population and usage scenarios. The average American, born in 2021, will use approximately 23,930 kgs of cement in their lifetime, with similar demands globally. Demand …
A Multi-Criteria Ranking System For Prioritizing Maintenance Of Levee Systems In Arkansas, Nguyen Danh Phan
A Multi-Criteria Ranking System For Prioritizing Maintenance Of Levee Systems In Arkansas, Nguyen Danh Phan
Graduate Theses and Dissertations
There are 208,009 properties in Arkansas that have more than a 26% chance of being severely affected by flooding over the next 30 years, which represents 13% of all properties in the state. A levee system is designed to reduce the flooding risk for urban and rural communities; however, most of the state's levees have been significantly outdated or built with engineering standards less rigorous than current best practices. The Levee Safety Action Classification (LSAC), as recorded in the National Levee Database (NLD), communicates the risk associated with living behind a particular levee and assists local, state, and federal stakeholders …
Scarico: It’S Only A Movie, Most Of The Time, Thomas Nelson
Scarico: It’S Only A Movie, Most Of The Time, Thomas Nelson
Graduate Theses and Dissertations
Exploitation cinema is a domain of motion picture content catering to a viewership interested in imagery that is more provocative than what mainstream audiences desire to see. These types of films are typically considered lowbrow entertainment and have been made in every era, albeit in a limited capacity proportional to the niche audience demand for them. Some time periods see a rise in exploitation film productions in response to a growing demand for such content from a larger share of the broader cinematic audience. This relationship indicates that period-specific cultural factors can cause mainstream audience members to seek out more …
Loan Survival: Are Socially Disadvantaged Farmers More Likely To Default Or Pay In Full?, Marie-Cécile Vekemans
Loan Survival: Are Socially Disadvantaged Farmers More Likely To Default Or Pay In Full?, Marie-Cécile Vekemans
Graduate Theses and Dissertations
This study aims at identifying racial and gender discrimination in the usage of credit for Socially Disadvantaged Farmers and Ranchers (SDFR) in the United States. Usage of credit is considered successful when a loan has been paid in full and a failure is considered when the borrower defaults. Identifying such a pathway would provide useful information to the Federal government United States Department of Agriculture (USDA) Farm Service Agency (FSA) to evaluate the effectiveness and equity of loan programs. This study uses data from the USDA FSA farm loan programs that mainly target socially disadvantaged farmers and other underserved groups. …
Micronutrient Concentration Effects On Lettuce Growth And Susceptibility To Pythium, Kalyn M. Helms
Micronutrient Concentration Effects On Lettuce Growth And Susceptibility To Pythium, Kalyn M. Helms
Graduate Theses and Dissertations
In hydroponic production waterborne pathogens such as Pythium are ubiquitous and continually threaten a wide range of Controlled Environment Agriculture (CEA) crops in hydroponic production, including but not limited to: lettuce, spinach, basil, arugula, cucumber, tomato, sweet pepper, roses, chrysanthemums, and cannabis (Sutton et al., 2006; Gull, 2002; McGehee and Raudales, 2021; Gillespie, 2020). Despite extensive sanitation measures, disease control in hydroponics is fallible and requires constant surveillance and management to minimize outbreaks (Sutton et al., 2006). A potential disease suppression strategy is to increase micronutrient concentrations within hydroponic systems to naturally strengthen plant defenses against pathogens such as Pythium. …
Enhancing Human Schwann Cells Reparative Behavior Using Heparin/Collagen Layer-By-Layer Coatings, Luis Carlos Pinzon-Herrera
Enhancing Human Schwann Cells Reparative Behavior Using Heparin/Collagen Layer-By-Layer Coatings, Luis Carlos Pinzon-Herrera
Graduate Theses and Dissertations
When a peripheral nerve injury (PNI) occurs, the gold standard for tissue regeneration is the use of autografts. However, due to the secondary effects produced by multiple surgeries involved in the removal and implantation of autografts for very small lesions, it is possible to replace them with the use of Nerve Guide Conduits (NGCs). However, NGCs are limited to short lesions (less than 1 cm). This limitation is caused by the absence of compounds in the extracellular matrix (ECM) that autografts can provide. Since much of the regenerative process takes place on the NGC surface, our work aims to modify …
Life Cycle Assessment Of Novel Electrochemical Struvite Recovery In Municipal Wastewater Treatment At The Plant And U.S. Watershed Scales, Karla Morrissey
Life Cycle Assessment Of Novel Electrochemical Struvite Recovery In Municipal Wastewater Treatment At The Plant And U.S. Watershed Scales, Karla Morrissey
Graduate Theses and Dissertations
As the supply of phosphorus decreases, nutrient recovery in municipal wastewater treatment has become an important area of research. Recovery methods for phosphorus-containing fertilizers, such as struvite, and other products are currently being developed and assessed for their efficiency and economic feasibility. Potential environmental impacts from nutrient recovery are also being assessed as design for the environment is important, especially with regards to the eutrophying potential of phosphorus in phosphorus-limited freshwater aquatic systems. Life cycle assessment (LCA) is a tool that can be used to estimate potential environmental impacts of a product or service focusing on its entire life cycle. …
Evaluation Of Biological And Chemical Seed Treatments For Management Of Rice Diseases, Sherif Adam Sharfadine
Evaluation Of Biological And Chemical Seed Treatments For Management Of Rice Diseases, Sherif Adam Sharfadine
Graduate Theses and Dissertations
Rice is the primary staple for more than half of the global population and is the second most important cereal worldwide. In the US, rice is primarily grown in the southern states, with Arkansas leading production and responsible for 47% of the total rice production in the country. Diseases cause significant yield losses in rice. Sheath blight, rice blast and bacterial panicle blight are the main diseases in rice and cause significant yield losses. Sheath blight alone could cause up 50% yield loss in heavily damaged fields with highly susceptible cultivars. Additionally, rice seed and seedling diseases primarily caused by …
Informal Education Experiences Of Black Women-Owned Healthcare Small Businesses In Mississippi, Timothy E. Lampkin
Informal Education Experiences Of Black Women-Owned Healthcare Small Businesses In Mississippi, Timothy E. Lampkin
Graduate Theses and Dissertations
Small businesses are critical to the economic success of the United States, and several states, such as Mississippi, have a strong reliance on small business development. Through small, individually owned businesses, the overall economy is enhanced, and the quality of life for many is improved. A growing trend within the small business community is private ownership by Black women. This population segment has dramatically grown in their presence within business ownership, and it is necessary to describe elements of their success. The proposed research focuses on informal education as an enabler of this small business success. Informal education is a …
Data-Driven Deep Learning-Based Analysis On Thz Imaging, Haoyan Liu
Data-Driven Deep Learning-Based Analysis On Thz Imaging, Haoyan Liu
Graduate Theses and Dissertations
Breast cancer affects about 12.5% of women population in the United States. Surgical operations are often needed post diagnosis. Breast conserving surgery can help remove malignant tumors while maximizing the remaining healthy tissues. Due to lacking effective real-time tumor analysis tools and a unified operation standard, re-excision rate could be higher than 30% among breast conserving surgery patients. This results in significant physical, physiological, and financial burdens to those patients. This work designs deep learning-based segmentation algorithms that detect tissue type in excised tissues using pulsed THz technology. This work evaluates the algorithms for tissue type classification task among freshly …
Mle And Eap Methods For Estimating Ability Scores For Data Of Varying Sample Size And Item Length, Sahar Taji
Mle And Eap Methods For Estimating Ability Scores For Data Of Varying Sample Size And Item Length, Sahar Taji
Graduate Theses and Dissertations
In this research, the performance of two popular estimators, Maximum Likelihood Estimator(MLE) and Bayesian Expected a Posteriori (EAP) is studied and compared in estimating the latent ability score in an Item Response Theory (IRT) model. The 2-Parameter Logistic (2PL) IRT model which is characterized by difficulty and discrimination item parameters is used to estimate the latent ability scores. Several datasets are generated for variety of sample size and item length values. The Monte-Carlo simulation is used to analyze the performance of the estimators. Results show that MLE produces reliable results with low root mean square error (RMSE) across all datasets. …
Prediction Of Radiography Certification Examination Scores Using Astin’S Input-Environment-Output Model, Deanna Barymon
Prediction Of Radiography Certification Examination Scores Using Astin’S Input-Environment-Output Model, Deanna Barymon
Graduate Theses and Dissertations
Numerous health profession fields, including radiology, have attempted to identify predictors of success on their respective credentialing exams. This preregistered study seeks to determine if available academic performance measures may predict radiography national certification examination scores and help educators identify students for remediation and support. The study will use the Astin Input-Environment-Output Model, which ascertains that student outcomes are a result of what they bring into an academic program and the environment experienced during the program. The non-experimental retrospective study will look at the 2018 to 2021 Arkansas State University radiography cohorts. Multiple regression will be used to determine if …
Understanding Perceptions Of Graduating Seniors From Rural Schools On Higher Education: A Preregistered Study, Desiree Denise Brake
Understanding Perceptions Of Graduating Seniors From Rural Schools On Higher Education: A Preregistered Study, Desiree Denise Brake
Graduate Theses and Dissertations
The purpose of this qualitative case (preregistered) study is to interview rural young Americans, deeply explore how they think about higher education as they prepare for life beyond high school, and analyze how those views and perceptions translate into barriers or motivators to its pursuit. Rural Americans feel less optimistic about their financial futures, find it more difficult to find a job in their communities, and believe their children will have a lower standard of living than their parents when they reach their parents’ age (Morin, 2016). Rural students are more likely to graduate from high school than their urban …
The Influence Of Beliefs About Emotion On Avoidance Behaviors, Elise Warner
The Influence Of Beliefs About Emotion On Avoidance Behaviors, Elise Warner
Graduate Theses and Dissertations
The beliefs individuals hold about emotions have been shown to influence their tendencies to avoid distressing situations. While much of the work to-date has been on beliefs about whether emotions can be changed (i.e., malleability beliefs), there is research suggesting that the belief that emotions last for long periods of time (i.e., longevity beliefs) have important implications for emotion regulation (Veilleux et al., 2020). Thus, our aim was to examine the relationship between longevity beliefs and experiential avoidance. We predicted that greater longevity beliefs would be associated with greater avoidance tendencies, and that stronger beliefs in the moment would also …
Deciphering Surfaces Of Trans-Neptunian And Kuiper Belt Objects Using Radiative Scattering Models, Machine Learning, And Laboratory Experiments, Al Emran
Graduate Theses and Dissertations
Decoding surface-atmospheric interactions and volatile transport mechanisms on trans-Neptunian objects (TNOs) and Kuiper Belt objects (KBOs) involves an in-depth understanding of physical and thermal properties and spatial distribution of surface constituents – nitrogen (N2), methane (CH4), carbon monoxide (CO), and water (H2O) ices. This thesis implements a combination of radiative scattering models, machine learning techniques, and laboratory experiments to investigate the uncertainties in grain size estimation of ices, the spatial distribution of surface compositions on Pluto, and the thermal properties of volatiles found on TNOs and KBOs. Radiative scattering models (Mie theory and Hapke approximations) were used to compare single …
Female Adults’ Experiences Of Sexual Harassment And Assault In The Presence Of Others: A Qualitative Analysis Of The Effectiveness And Consequences Of Bystander Intervention Strategies, Kayla Ford
Graduate Theses and Dissertations
Bystander intervention programs aim to reduce the acceptance of violence against women by fostering prosocial behavior from community members, and often provide knowledge on behaviors associated with sexual risk and ways a bystander can intervene. However, there is limited knowledge on which intervention strategies are used, and how these interventions impact perpetrator behavior and incidence of verbal and physical harm to those involved. There is even less research on these phenomena from the perspective of the victim. To address these gaps, the current study utilized a qualitative approach to (1) identify bystander intervention strategies employed; (2) discuss trends of the …
Reliability Enhancing Control Algorithms For Two-Stage Grid-Tied Inverters, Yuheng Wu
Reliability Enhancing Control Algorithms For Two-Stage Grid-Tied Inverters, Yuheng Wu
Graduate Theses and Dissertations
In the photovoltaic (PV) generation system, two types of grid-tied inverter systems are usually deployed: the single-stage grid-tied inverter system and the two-stage grid-tied inverter system. In the single-stage grid-tied inverter system, the input of the inverter is directly connected to the PV arrays, while an additional dc-dc stage is inserted between the PV arrays and the dc-ac inverter in the two-stage design. The additional dc-dc stage could provide a stable dc-link voltage to the inverter, which also enables new design possibilities, including the multi-MPPT operation and solar-plus-storage application. Thus, the two-stage grid-tied inverter has been widely used in the …
Investigating How Facilitators View The Functions And Perceived Values Of Reflective Activities On Transformative Learning Amongst People In Addiction, James Ryan Eller
Investigating How Facilitators View The Functions And Perceived Values Of Reflective Activities On Transformative Learning Amongst People In Addiction, James Ryan Eller
Graduate Theses and Dissertations
Although there has been considerable empirical support for the effect of reflection, and specifically reflective activities, within the domain of transformative learning (Ballon & Skinner, 2008; King, 2004; Mezirow, 2012; Roessger, 2014; Taylor, 2017), there is a gap in the literature concerning the value of formal reflective activities when used with people in addiction recovery programs. I will interview facilitators of addiction programs to inquire on the methods of reflection their programming provides people in addiction, investigate the effectiveness of the activities, and then determine the connections (if any) between formal reflective activities and transformation in people in addiction. This …
The Effect Of Spirulina Platensis Algae Inclusion In Feed Of Commercial Broilers Subjected To Cyclic Heat Stress, Kirsten Shafer
The Effect Of Spirulina Platensis Algae Inclusion In Feed Of Commercial Broilers Subjected To Cyclic Heat Stress, Kirsten Shafer
Graduate Theses and Dissertations
The effect of Spirulina platensis inclusion in feed of commercial broilers was evaluated over one experiment. The study aimed to investigate the effects of Spirulina platensis freshwater algae inclusion on live performance and processing characteristics of commercial broilers subjected to daily cyclic heat stress. Day old Ross 708 male broilers were placed into 8 environmentally controlled chambers. At d 21, four chambers remained on a control diet containing no algae (CON) while 4 chambers received a diet that included algae at an inclusion rate of 2.5% (ALG). An 8 hour daily cyclic heat stress (24°C to 36°C) was applied to …
How Faculty Perceive Their Role In Student Learning Assessment And Program Improvement, Mary Elizabeth Spence
How Faculty Perceive Their Role In Student Learning Assessment And Program Improvement, Mary Elizabeth Spence
Graduate Theses and Dissertations
Student success is inextricably linked with the assessment of student learning, and the literature cites the need for faculty engagement in the assessment process. However, many issues related to the assessment process may be considered demotivators by faculty. The purpose of this study is to examine whether faculty motivation to participate in student assessment was influenced by the accreditation status of the faculty member’s academic field. Data collection for this qualitative case study included individual interviews with participants and a review of documents related to the assessment process.
Precision Weed Management Based On Uas Image Streams, Machine Learning, And Pwm Sprayers, Jason Allen Davis
Precision Weed Management Based On Uas Image Streams, Machine Learning, And Pwm Sprayers, Jason Allen Davis
Graduate Theses and Dissertations
Weed populations in agricultural production fields are often scattered and unevenly distributed; however, herbicides are broadcast across fields evenly. Although effective, in the case of post-emergent herbicides, exceedingly more pesticides are used than necessary. A novel weed detection and control workflow was evaluated targeting Palmer amaranth in soybean (Glycine max) fields. High spatial resolution (0.4 cm) unmanned aircraft system (UAS) image streams were collected, annotated, and used to train 16 object detection convolutional neural networks (CNNs; RetinaNet, Faster R-CNN, Single Shot Detector, and YOLO v3) each trained on imagery with 0.4, 0.6, 0.8, and 1.2 cm spatial resolutions. Models were …
A Quantitative Examination Of The Influence Of Social And Structural Communication Variables On The Social Connectedness Of People Experiencing Homelessness, Shawn Michael Evans
A Quantitative Examination Of The Influence Of Social And Structural Communication Variables On The Social Connectedness Of People Experiencing Homelessness, Shawn Michael Evans
Graduate Theses and Dissertations
This thesis examined the influence of social and structural communication variables on the perceived social connectedness of people experiencing homelessness in the Northwest Arkansas (NWA) and Joplin, Missouri areas. This study employed the ecological perspective of communication infrastructure theory (CIT; Ball-Rokeach et al., 2001) and a communication perspective which envisions communicative interaction as constitutive of social experience. Using survey data from 166 participants, this study examined 11 research questions and hypotheses drawn from extant literature on homelessness, social connectedness, and CIT. ANOVAs, t-tests, and hierarchical multiple regression analyses revealed a complex relationship between individuals and the communicative environment. This study …
Investigating The Effect Of Perceived Social Support And Professional Support On The Ability To Persist As A Building Administrator In Arkansas, Jill Annette Larosa
Investigating The Effect Of Perceived Social Support And Professional Support On The Ability To Persist As A Building Administrator In Arkansas, Jill Annette Larosa
Graduate Theses and Dissertations
Across the United States, our K-12 public schools have very low levels of principals persisting in their jobs. The national average for principal tenure is four years, and one out of every five principals in poverty districts leaves after one year (Levin et al., 2019). The tenure average of four years is a devastating statistic because, according to an investigation commissioned by the Wallace Foundation (Leithwood et al., 2011), it takes an average of five years with a new administrator for a school’s performance to rebound to the level of achievement that existed before the administration change. At the current …