Digital Commons Network^™

Calculation Of Elastic Constants Of Bulk Metallic Glasses From Indentation Tests, Zhitong Xu, Ming Liu, Fuqian Yang

Chemical and Materials Engineering Faculty Publications

One of the challenges in the applications of instrumented indentation is to simultaneously measure elastic modulus and Poisson’s ratio of homogeneous, isotropic materials. This work proposes empirical equations for simultaneous calculation of elastic modulus and Poisson’s ratio of bulk metallic glasses (BMGs) from the ratio of the short diagonal length to the long diagonal length and the area of the Knoop imprint. The parameters pre- sented in the empirical equations are determined first by Knoop microhardness tests of 24 BMGs, whose elastic moduli and Poisson’s ratios are measured by resonant ultrasound spectroscopy. These empirical equations are further validated by the …

“Zero” Porosity High Loading Nmc622 Positive Electrodes For Li-Ion Batteries, Haidar Y. Alolaywi, Kubra Uzun, Yang-Tse Cheng

Chemical and Materials Engineering Faculty Publications

LiNi0.6 Mn0.2Co0.2 O 2 (NMC622) is a widely used positive electrode material for lithium-ion batteries, including electric vehicles. In this work, we investigated the effects of porosity, ranging from “zero” to the typical 35%, on the electrochemical behavior of high- loading NMC622 electrodes. Although it is well known that the energy density of the electrode increases with increasing areal capacity and decreasing porosity, NMC-positive electrodes with exceedingly low porosity (e.g., near zero) and high loading (e.g., 4 mAh cm−2 ) have not been investigated. Here, we report an intriguing observation that the “zero porosity” NMC electrode can have higher capacity …

Slope Unit Maker (Sumak): An Efficient And Parameter-Free Algorithm For Delineating Slope Units To Improve Landslide Modeling, Jacob B. Woodard, Benjamin B. Mirus, Nathan J. Wood, Kate E. Allstadt, Benjamin A. Leshchinsky, Matthew M. Crawford

Faculty, Staff, and Affiliated Publications--KGS

Slope units are terrain partitions bounded by drainage and divide lines. In landslide modeling, including susceptibility modeling and event-specific modeling of landslide occurrence, slope units provide several advantages over gridded units, such as better capturing terrain geometry, improved incorporation of geospatial landslide-occurrence data in different formats (e.g., point and polygon), and better accommodating the varying data accuracy and precision in landslide inventories. However, the use of slope units in regional (> 100 km²) landslide studies remains limited due, in part, to the large computational costs and/or poor reproducibility with current delineation methods. We introduce a computationally efficient algorithm …

Precision Application Of Water To Equine Racing Surfaces, Sydney Rae Cannon

Theses and Dissertations--Biosystems and Agricultural Engineering

As the horseracing industry has come under more scrutiny as of late, horse and rider safety has become a priority. The best was to keep a rider safe is to keep them on their horse, and the best way to do that is to keep the horse upright. This all comes down to consistency both between tracks and across a single track. The most important method of managing track consistency is through moisture content. This study examined how track design can impact moisture application, how moisture content can impact the surface material, and what design elements can be implemented to …

Development Of Fungal Hydrogels For 3d Bioprinting And Cellular Agriculture, Lauren E. Doyle

Theses and Dissertations--Biosystems and Agricultural Engineering

Hydrogel scaffolds are an important component to cellular agriculture. There is a need for a sustainable alternative to the commonly used gelatin-sodium-alginate hydrogels. Specific edible fungus species may provide a suitable alternative. Many fungi possess high protein contents, ease of cultivation, and strong functional properties. However, functional characterizations and application of fungal flour and protein extracts in cellular agriculture are lacking in the literature. Therefore, this study’s objectives were to 1) Develop processes to create functional fungal protein fractions from different fungal strains and evaluate their characteristics, and 2) Quantify the printability of the resulting fungal gels for the creation …

Pulse-Width Modulation Spray System Performance And Development Of A Novel System To Optimize Spray Use Efficacy, Prashanta Pokharel

Theses and Dissertations--Biosystems and Agricultural Engineering

The overarching objective of this research was to enhance our understanding of pulse width modulation (PWM) based nozzle control system and develop an intelligent nozzle control system for agricultural spray applications. This dissertation focused on measuring and analyzing the transient nozzle pressure characteristics and performance under PWM control. Additionally, it explored the development of an innovative multi-degree-of-freedom (DOF) nozzle control system for precise chemical applications in specialty crop systems.

The pressure dynamics of a PWM system were studied by developing an instrumentation system capable of operating a solenoid valve and recording pressure signals. A nozzle body and two manifolds of …

Extracting Social Network Model Parameters From Social Science Literature, Isaac Batts

Theses and Dissertations--Computer Science

When looking at computer modeling of social situations, much of the social science literature does not include ready-to-use statistics or parameters to be included in a social model. I explore studies related to speaking about racism (and other forms of bias), and interventions designed to diminish the occurrence of biased behavior, and use those readings to synthesize plausible parameters for a social computer model.

Tension Control And Interproximation Techniques Forshape Design And Rgb-Depth Segmentation Reconstruction And Modeling, Anastasia Kazadi

Theses and Dissertations--Computer Science

Human eyes possess remarkable capabilities to perceive and interpret a wealth of information about our environment; from discerning colors and depths to identifying object boundaries and navigating obstacles, our eyes serve as invaluable guides in our daily lives. Ongoing research in the fields of computer vision and computer graphics continuously explore the ways to replicate extraordinary human vision abilities in order to develop systems and frameworks which would enable computers to capture, analyze, and act upon discerned information. In this context, this dissertation seeks to investigate and automate various shape control and data processing techniques for 3D modeling and shape …

Detecting And Recovering From Player Preference Shifts In A Player Modeled Experience Management Environment, Anton Vinogradov

Theses and Dissertations--Computer Science

An important challenge in game design is understanding and maintaining player engagement. This is particularly crucial in both entertainment and educational games, where the player's commitment to the game directly impacts their experience and learning outcomes. However, quantifying engagement proves challenging due to the diverse interests of players. This dilemma is addressed through adaptive game design techniques where the game world is personalized to suit player preferences. In computer games, this personalization is facilitated through Experience Management and Player Modeling, where an intelligent agent gathers information on the player, including their preferences and actions, and takes actions to modify the …

Finding Hierarchies To Improve Learning In Hierarchical Reinforcement Learning, Roy Mobley

Theses and Dissertations--Computer Science

Reinforcement Learning (RL) is an approach to allowing computer agents to try and learn how to solve problems by learning what actions are best to take in a given situation. RL is effective for learning what to do in an environment, but as the problem grows larger, the amount of information needed grows exponentially, making RL less effective on complex problems. A big challenge, often called the curse of dimensionality, is that the number of states and possible number of actions in an environment can grow too large to sufficiently test every possible combination of state and action. One method …

Development Of Synthetically Accessible Glycolated Polythiophenes For High-Performance Organic Electrochemical Transistors, Bowen Ding, Vianna N. Le, Hang Yu, Guanchen Wu, Adam V. Marsh, Edgar Gutiérrez-Fernández, Nicolás Ramos, Martina Rimmele, Jaime Martín, Jenny Nelson, Alexandra F. Paterson, Martin Heeney

Chemical and Materials Engineering Faculty Publications

Four glycolated polythiophene-based organic mixed ionic-electronic conductors (OMIECs), PE2gTT, PE2gT, PT2gTT, and PT2gT are prepared by atom-efficient direct arylation polymerization, avoiding the need for toxic organometallic pre- cursors. PE2gT, PT2gTT, and PT2gT are operable in p-type accumulation mode organic electrochemical transistors (OECTs), with PT2gT displaying the best device performance with a μC* product figure-of-merit of 290 F cm−1 V−1 s−1 . A record volumetric capacitance among p-type glycolated polythiophene OMIECs of 313 F cm−3 is observed for PE2gT, ascribed to the high proportion- ality of polar components in its materials design. The good OECT performance of PE2gT with μC* = …

The Integrated Behavioral Model Of Mental Health Help Seeking (Ibm-Hs): A Health Services Utilization Theory Of Planned Behavior For Accessing Care, Joseph H. Hammer, David L. Vogel, Patrick R. Grzanka, Nayeon Kim, Brian T. Keum, Claire Adams, Sarah A. Wilson

Chemical and Materials Engineering Faculty Publications

This article introduces the integrated behavioral model of mental health help seeking (IBM-HS), a theoretical model for understanding the constructs (e.g., systemic, predisposing, and enabling factors; mental health literacy; illness perceptions; perceived need; stigma; shame; perceived benefits, motivation) that influence people’s decision making around seeking professional mental health care and their ultimate access to formal treatment. The IBM-HS is a help-seeking-specific adaptation of the empirically supported integrated behavioral model and integrative model, which are themselves evolutions of the theory of planned behavior and theory of reasoned action. The IBM-HS posits that help-seeking determinants (e.g., structural forces; cultural influences; past help-seeking …

Multi-Jurisdictional Hazard Mitigation Plan For Landslides For The Big Sandy Area Development District, Kentucky, Matt M. Crawford, Hudson J. Koch, Jason M. Dortch

Contract Reports--KGS

Landslides are a complex geologic hazard that occurs worldwide, impacting lives, infrastructure, and property. The Big Sandy Area Development District, Kentucky incurs high landslide activity impacting several municipalities. This hazard mitigation planning project includes landslide susceptibility and risk assessments for the Big Sandy Area Development District. We based the landslide susceptibility model on statistics of hillslope morphological features such as slope, curvature, roughness, aspect, and elevation. Using a dual machine learning approach, we modeled the probability of landslide occurrence, defined as an area that is occupied, or might be occupied in the future, by a landslide. We also developed the …

Surficial Geologic Map Of The Smiths Grove 7.5-Minute Quadrangle, Kentucky, Meredith Swallom, Bailee Nicole Hodelka, Matthew Massey, Hannah Hayes, Charles Wells Iii, Emily Morris

Contract Reports--KGS

The Kentucky Geological Survey (KGS), a state-supported independent research center within the University of Kentucky, is committed to providing accurate and unbiased geologic information on natural resources, environmental issues, and natural hazards in Kentucky. While Kentucky boasts complete coverage by 1:24,000-scale geologic bedrock maps, surficial materials have been largely overlooked, except in regions with thick deposits obscuring the bedrock. Given the increasing trends in economic development and urbanization, detailed surficial geologic mapping has become crucial for supporting geotechnical planning, environmental management, and hazard assessment. In response, KGS has prioritized new, detailed surficial geologic mapping since 2004, specifically targeting areas anticipated …

Venture Capital & State Policy: A Mixed Methods Approach For Identifying And Understanding “Bright Spots”, David Durman Ii, Cole Wilson

MPA/MPP/MPFM Capstone Projects

The relationship between the availability of venture capital at the state level and state policy is largely unexplored in research. To expand the understanding of this subject, the aim of this paper is to determine what states are performing greater than would be expected in the area of venture capital availability and examine the nature of policy in those states in order to glean insights in regard to policy improvement. To that end, the researchers developed a multiple regression model to identify overperforming states, then performed an examination of policy within the states identified and contacted subject matter experts within …

Advancing The Understanding Of Successful Technology Implementation Factors Within State Dots: A Maturity Model Perspective, Amit Tripathi, Roy Sturgill, Gabriel Dadi, Hala Nassereddine, Alexa Mitchell

Civil Engineering Faculty Publications

In an effort to improve the security, dependability, and quality of infrastructure systems, the implementation of complex transportation construction and maintenance projects is essential. Building upon a previous study that identified six crucial factors for effectively implementing new and emerging technologies in the State Department of Transportations (DOTs), this research aims to comprehensively explore six critical factors using a maturity model perspective. DOTs have shown increasing interest in adopting emerging and wireless technologies, as evident in various Federal Highway Administration Every Day Counts initiative. This study employs a mixed-methods approach, using survey responses from DOT personnel to evaluate the relative …

Investigating The Impact Of Leaderboards, Badges, And Ebucks On High School English Language Learners’ Cognitive Engagement, Self-Efficacy And Intrinsic Motivation Toward Reading In English, Omar J. Almamoori

Theses and Dissertations--Curriculum and Instruction

This study examines the impact of gamification elements, in particular leaderboards, badges, and eBucks, on the cognitive engagement (CE), intrinsic motivation (IM), and self-efficacy (SE) of English Language Learners (ELLs) at a high school in the Southeastern United States. The investigation, conducted during optional weekly readings, utilizes a mixed methods design to investigate the effects of gamification on ELLs' learning experiences. Through pre-post surveys and semi-structured interviews, data was collected to assess the gamified intervention's impact. Utilizing a one-way covariate analysis (ANCOVA) in IBM SPSS Statistics (version 29), the study evaluates the effect of gamification while controlling for grade, gender, …

Onboarding New Administrators At Noblesville Schools, Janae Mobley

Theses and Dissertations--Educational Leadership Studies

While many organizations invest in their leaders when onboarding them for their new role; oftentimes this process can be overlooked in the K-12 school setting when it comes to school administrators. As a result, this study focuses on analyzing the needs of new school administrators and how to better support them in their role when transitioning to a new district or from the classroom. This study utilizes Mixed-Methods Action Research methodology to assess and address the needs of new school administrators at Noblesville Schools, a K-12 public school district in Hamilton County, Indiana.

The Co-Curriculum Of College Student Employment: Perspectives From Supervising Practitioners, Brittany Begley Wildman

Theses and Dissertations--Educational Policy Studies and Evaluation

College student employees are not only serving the overall mission of their institutions, but also developing career readiness skills through daily interactions while at work. In this study, I explore the perceptions of the supervisors of student employees as both managers and student affairs professionals. Through one-on-one interviews with supervisors, discussing their interactions with students, I explore the implicit and explicit curricula they provide to their students using a curriculum analysis framework. I then compare the resulting learning outcomes against those identified in industry standards. The supervisors described supporting student employees' personal development during the student employment experience as well …

An Evaluation Of Statistical Approaches Within A Higher Education Research Framework: How Does Online Distance Learning Impact Student Outcomes?, Nathaniel P. Wilson

Theses and Dissertations--Educational Policy Studies and Evaluation

Appropriate methodology choices are of the utmost importance in research, particularly in measurement and education research. When higher education administrators and researchers study topics related to student outcomes, choosing a statistical approach that produces unbiased estimates is of primary concern. Additionally, studying student outcomes in the context of nationally representative samples provides valuable insights into the state of higher education in the U.S. When examining these data, it is critical that the nested structure be taken into consideration prior to making methodological decisions.

The purpose of the following manuscripts is to demonstrate how education researchers can develop, implement and evaluate …

Dialogue Over Data: An Interview Study Of Evaluators At Institutions Accredited By Aaqep, Laura Mirochna

Theses and Dissertations--Education Sciences

The university supervisor’s role is to evaluate student teachers during the field experience process. The processes for onboarding and evaluation of university supervisors vary widely at universities in the United States but are determined, in part, by the data collection requirements of the programmatic accreditation process. An interview study was done to show how different schools are onboarding and evaluating their university supervisors and collecting evaluation data for AAQEP as the programmatic accreditor. The overarching research question is: RQ1: What is the process for onboarding and evaluating university supervisors, if any is used? The study's results indicate that AAQEP does …

Poc@Fwcd: A Critical Discourse Analysis Of Black@ Instagram In K-12 Independent Schools, Chaka Cummings

Theses and Dissertations--Educational Policy Studies and Evaluation

The summer of 2020 saw many aspects of American society deal with the racial reckoning that arose in the wake of the deaths of Ahmaud Arbery, Breonna Taylor, and George Floyd. Their murders sparked outrage, protests, and calls for action and change in the United States through a critical examination of race relations across numerous facets of society. Structures such as educational institutions were called to perform this critical examination much in the same way that cities and industries were. A catalyst in the calls for change came from students through their utilization of social media platforms.

This study is …

The Impact Of Dual Credit Participation On Graduation & Excess Hours, Erin Mulligan-Nguyen

Theses and Dissertations--Educational Policy Studies and Evaluation

The interest and participation in dual credit programs and courses has grown over the past several decades, especially within Texas; however, there is a lack of research that shows how the participation in dual credit programs and courses has impacted leading and lagging student success metrics once they enroll at a post-secondary institution.

The purpose of this study was to examine the impact dual credit participation had on six-year graduation rates and exceeding excess hours at a public four-year regional university in South Texas. The researcher used a non-experimental quantitative study with ex-post facto student data. The study examined leading …

Student Loan Debt: Exploring The Economic Influences On Federal Student Loan Default For Students That Attended Public, Two-Year Institutions, Brian Perry

Theses and Dissertations--Educational Policy Studies and Evaluation

Over the past 30 years, a shift occurred in higher education that saw more of the burden for paying for postsecondary education placed on students. Combined with rising tuition and fees, this has led students to take on increasing amounts of student debt. Despite the historic rise in student loans, surprisingly little attention has focused on those students who default on their student loans. Additionally, the academic literature on student loans has predominately focused on traditional students at four-year institutions, despite the fact that nearly half of all undergraduates attend public two-year institutions. Finally, those studies that include economic factors …

Increasing Expectations For Entry: Analyzing Changes In Labor Market Entry-Level Education Requirements Over Time With Potential Implications For Credential Or Degree Inflation And Returns-To-Education, William Nicholas Grinstead

Theses and Dissertations--Educational Policy Studies and Evaluation

The dissertation asks the following question: Have occupations increased academic degree requirements over time?

The literature review provides background on the origin and criticisms of the concept of a “knowledge economy.” It addresses economic “signaling theory” and sociologic “credentialism.”

The methodology relies on a trend analysis using the Bureau of Labor Statistics (BLS) Occupational Outlook Handbook and the occupations’ Standard Occupational Classification (SOC) system and its predecessor the Dictionary of Occupational Titles (DOT). In order to address whether occupations have increased academic degree requirements over time, this dissertation will compare entry-level education requirements for BLS SOC occupations that today are …

Exploring Elementary Teachers’ Self-Efficacy And Propensity For Teaching Stem, Ashley Wilkirson

Theses and Dissertations--Science, Technology, Engineering, and Mathematics (STEM) Education

The following research is conducted in the interest in exploring self-efficacy (or the lack of) in pre- and in-service elementary school teachers when it comes to teaching STEM. In order to explore the issue of self-efficacy for STEM in elementary schools, it comes to defining what STEM education is and what self-efficacy is. These definitions guide research collected in building these future and current teachers’ self-efficacy, with factors ranging from resources available, pre-service training, professional development, content area knowledge, pedagogical knowledge, perceptions of teaching STEM, and opportunities to collaborate with other teachers were listed as some of the reasons. These …

Exploring Teachers’ Views Of The Nature Of Science And Their Beliefs And Understanding About Viruses And Covid-19: A Multiple Case Study Of Three Secondary Science Teachers At A Rural High School In The Southeastern United States, Jeffrey Chalfant

Theses and Dissertations--Science, Technology, Engineering, and Mathematics (STEM) Education

Over the past several decades, science education reforms have called for students to develop appropriate views of the nature of science and have a comprehensive understanding of subject matter. Additionally, education research has demonstrated that teachers must have appropriate views of the nature of science and strong content knowledge as necessary conditions for appropriate instruction on the nature of science. However, research has consistently shown that teachers hold naïve or inadequate views of the nature of science. This is problematic as teachers are tasked with teaching science to students that is aligned with current education standards. Therefore, teachers need to …

Border Bones – Between Borders: A Performer’S Guide To The Formation Of A Music Ensemble, Commissioning, And Recording, Juan Saldivar Jr

Theses and Dissertations--Music

Border Bones, a trombone duo formed in 2023, is committed to encouraging marginalized and underrepresented composers from Mexico and the United States. In its first project, Border Bones commissioned ten new works for the trombone repertoire. The focus and representation of this projected included Mexican, female, and LGBTQ+ composers. Once commissioned, Border Bones recorded these works through New Branch Records and released them as an album titled, Between Borders.

This dissertation is a performer’s guide to forming an ensemble, commissioning new works, and recording an album. It also includes interviews with well-known individuals from the music industry that have commissioned, …

The Aesthetics Of Environmental Risk In Paolo Bacigalupi’S The Windup Girl And The Water Knife, David Schwartz

Theses and Dissertations--English

Any work of environmentally oriented fiction that seeks to represent the wide-reaching effects of climate change is faced with the problem of scale. These texts must render visible change which is at once ubiquitous and microscopic, along with the cascade of side-effects generated in the wake of rising temperature, rising sea levels, and winnowing biodiversity. In short order, these texts must fully imagine what it means to live within the modern global risk society. Borrowing this sociological model from the late Ulrich Beck, I analyze the literary work of Paolo Bacigalupi, one of the foremost authors in the growing genre …

A Cytosine Analogue 5-Azacitidine Improves The Accumulation Of Licochalcone A In Licorice Glycyrrhiza Inflata., Xiaoling Ma, Ningxin Jiang, Jingxian Fu, Yuping Li, Lijun Zhou, Ling Yuan, Ying Wang, Yongqing Li

Plant and Soil Sciences Faculty Publications

Licochalcone A (LCA) is a characteristic compound of Glycyrrhiza inflata with anti-inflammatory, antioxidant and antitumor activities. However, G. inflata produces LCA in low quantities that does not meet the market demand. In this study, we found that DNA methylation inhibitor 5-azacitidine (5-azaC) successfully improved the LCA contents in G. inflata seedlings. Transcriptome analysis revealed a series of differentially expressed genes (DEGs), including transcription factors such as MYB, ERF, WRKY, and some structural genes related to flavonoid biosynthesis. However, whole genome bisulfite sequencing (BS-seq) results showed little effect of the 5-azaC treatment on the alteration of DNA methylation on these genes, …