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Friction And Heat Transfer Modeling Of The Tool And Workpiece Interface In Friction Stir Welding Of Aa 6061-T6 For Improved Simulation Accuracy, Ryan Melander Jun 2023

Friction And Heat Transfer Modeling Of The Tool And Workpiece Interface In Friction Stir Welding Of Aa 6061-T6 For Improved Simulation Accuracy, Ryan Melander

Theses and Dissertations

Friction stir welding (FSW) is a solid-state joining process that offers advantages over traditional fusion welding. The amount of heat generated during a FSW process greatly influences the final properties of the weld. The heat is generated through two main mechanisms: friction and plastic deformation, with friction being the larger contributor in a FSW process. There is a need to develop better predictive models of the heat generation and heat transfer in FSW. Almost all models seen in the literature validate temperature predictions on only one side of the tool/workpiece interface, thus ignoring possible inaccuracy that comes from incorrect partitioning …

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Variability Among Individual Male Runners Influences Cumulative Loading More Than Foot Strike Type, Tamarie Trotter Jun 2023

Variability Among Individual Male Runners Influences Cumulative Loading More Than Foot Strike Type, Tamarie Trotter

Theses and Dissertations

Foot strike type affects running mechanics and may influence overuse injury occurrence. Measuring the interaction between cumulative load and foot strike type may provide additional information that could eventually help with understanding injury mechanisms. The purpose of this study was to determine how foot strike type affects cumulative loading in runners, and to determine if individual metrics change throughout a 5-kilometer sub-maximal run. 30 participants ran on an instrumented treadmill for 5 km at 3.15 m/s with their preferred foot strike type (14 rearfoot strike, 16 non-rearfoot strike). Stride rate, foot strike angle, loading rate, per stride and per km …

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Extending Model Checking Using Inductive Proofs In Distributed Digital Currency Protocols, Kyle R. Storey Jun 2023

Extending Model Checking Using Inductive Proofs In Distributed Digital Currency Protocols, Kyle R. Storey

Theses and Dissertations

Model checking is an effective method to verify both safety and liveness properties in distributed systems. However, the complexity of model checking grows exponentially with the number of entities which makes it suitable only for small systems. Interactive theorem provers allow for machine-checked proofs. These proofs can include inductive reasoning which allows them to reason about an arbitrarily large number of entities. However, proving safety and liveness properties in these proofs can be difficult. This work explores how combining model checking and inductive proofs can be an effective method for formally verifying complex distributed protocols. This is demonstrated on a …

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Characterizing Dust From National Wind Erosion Research Network Sites Using Strontium Isotopes, Major And Trace Element Chemistry, And Mineralogy, Abby L. Mangum Jun 2023

Characterizing Dust From National Wind Erosion Research Network Sites Using Strontium Isotopes, Major And Trace Element Chemistry, And Mineralogy, Abby L. Mangum

Theses and Dissertations

The frequency of dust storms is increasing globally yet it is often difficult to determine dust sources in mixed events. Dust events may negatively impact human health, but the composition of major dust sources is not well characterized in arid regions globally. In the western US, the National Wind Erosion Research Network (NWERN) has various sites evaluating seasonal dust emissions to quantify dust fluxes. We used existing dust samples to characterize the isotopic, chemical, and mineralogical composition of dust over multiple seasons from ten representative NWERN sites and compared with land use, vegetation, and surficial geology. Our results show variability …

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Acoustic Directivity: Advances In Acoustic Center Localization, Measurement Optimization, Directional Modeling, And Sound Power Spectral Estimation, Samuel David Bellows Jun 2023

Acoustic Directivity: Advances In Acoustic Center Localization, Measurement Optimization, Directional Modeling, And Sound Power Spectral Estimation, Samuel David Bellows

Theses and Dissertations

Sound radiation from an acoustic source typically exhibits directional behavior, as is the case for the human voice, musical instruments, and loudspeakers, to name just a few. The necessity of directional data for many applications, such as sound source modeling, microphone placement, room acoustical design, and auralization, motivates directivity measurements. However, these measurements require careful understanding and implementation to produce the most meaningful results. Accordingly, this dissertation addresses several topics relevant to directivity theory, measurement, processing, and application. It first expands and amends previously published concepts of an acoustic source center and demonstrates the close relationship between the center and …

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Reaching Readers Beyond The Screens: Understanding How And Why Student Writers Compose For Audiences Of Self-Sponsored Digital Writing, Emily Elizabeth Brown Jun 2023

Reaching Readers Beyond The Screens: Understanding How And Why Student Writers Compose For Audiences Of Self-Sponsored Digital Writing, Emily Elizabeth Brown

Theses and Dissertations

In this qualitative research study, I use case studies to analyze the rhetorical understanding students have about online audiences, including how this understanding informs writerly choices, primarily in digital, self-sponsored writing. In this study I found that, while anxieties about online writing do exist, there are also many benefits for online writers that cause these anxieties to lessen. In addition, findings indicated that participants didn't always know how to correctly interpret and capitalize on audience feedback, which causes challenges, but these participants also claimed rhetorical power once they entered community spaces they cared about and better understood their purpose and …

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Detecting Lumbar Muscle Fatigue Using Nanocomposite Strain Gauges, Darci Ann Billmire Jun 2023

Detecting Lumbar Muscle Fatigue Using Nanocomposite Strain Gauges, Darci Ann Billmire

Theses and Dissertations

Introduction: Muscle fatigue can contribute to acute flare-ups of lower back pain with associated consequences such as pain, disability, lost work time, increased healthcare utilization, and increased opioid use and potential abuse. The SPINE Sense system is a wearable device with 16 high deflection nanocomposite strain gauge sensors on kinesiology tape which is adhered to the skin of the lower back. This device is used to correlate lumbar skin strains with the motion of the lumbar vertebrae and to phenotype lumbar spine motion. In this work it was hypothesized that the SPINE Sense device can be used to detect differences …

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Plains To Peaks: An Analysis Of The Relationship Between Colorado Butterfly Communities And Altitude, Anna O. James, Kathryn Hokamp, Chris García-Hellmuth, Richard P. Reading Jun 2023

Plains To Peaks: An Analysis Of The Relationship Between Colorado Butterfly Communities And Altitude, Anna O. James, Kathryn Hokamp, Chris García-Hellmuth, Richard P. Reading

Western North American Naturalist

We compared butterfly communities of the Plains, Foothills, and Montane Zones of the Colorado Front Range and examined 3 groups of butterflies—blues (Polyommatinae species), fritillaries (Speyeria and Boloria spp.), and painted ladies (species Vanessa cardui)—for altitude shifts between 2014 and 2020. We conducted these analyses using data collected by volunteer butterfly monitors from the Colorado Butterfly Monitoring Network, a group organized and run by Butterfly Pavilion in Westminster, Colorado. Monitors walked designated routes and counted all butterflies they saw, identifying each to the lowest possible taxonomic group they could. We sorted routes into the 3 altitude zones, organized …

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Reconstructing Historical Earthquake-Induced Tsunamis: Case Study Of 1852 Event Using The Adjoint Method Combined With Hmc, Chelsey Noorda Jun 2023

Reconstructing Historical Earthquake-Induced Tsunamis: Case Study Of 1852 Event Using The Adjoint Method Combined With Hmc, Chelsey Noorda

Theses and Dissertations

Seismic hazard analysis aims to estimate human risk due to natural disasters such as earthquakes. To improve seismic hazard analysis, our group is focused on earthquake induced tsunamis and the use of statistical models to reconstruct historical earthquakes. Based on the estimated wave heights given in anecdotal historical descriptions, we created observational probability distributions to model the historically recorded observations and constructed a prior distribution on the relevant earthquake parameters based on known seismicity of a given region. Then we used the software package GeoClaw, and a Metropolis-Hastings sampler to obtain a posterior distribution of earthquake parameters that most closely …

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Marital Stability In Newlywed Remarried Couple Relationships: Positive Communication And Marital Interactions In Shared Moments Or Activities, Colette Hickman-Evans Jun 2023

Marital Stability In Newlywed Remarried Couple Relationships: Positive Communication And Marital Interactions In Shared Moments Or Activities, Colette Hickman-Evans

Theses and Dissertations

Remarriages are more structurally diverse, last less time, are more vulnerable, and at greater risk for divorce than first marriages. The newlywed stage of marriage is a critical time when relationship patterns are established or reinforced that can impact a relationship for years to come, yet very few studies have examined remarried relationships in the newlywed stage. This study examined the association between marital interaction, positive communication, and marital instability in 348 newlywed remarried couple participants from a nationally representative sample. Using structural equation modeling (SEM) and actor-partner interdependence model with mediation (APIMeM), the findings indicated that positive communication was …

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Developing Microfluidic Devices For Biomolecule Analysis, Jacob Brent Nielsen Jun 2023

Developing Microfluidic Devices For Biomolecule Analysis, Jacob Brent Nielsen

Theses and Dissertations

Microfluidics can take laboratory processes and miniaturize them, which led to the term lab-on-a-chip. Microfluidic devices are fabricated with a variety of materials and methods, each offering distinct advantages for bioanalysis. This dissertation describes two methods to create these devices, with the use of four different materials to achieve different assay needs. In the first application in this dissertation, hot-embossed cyclic olefin copolymer was used to create microdevices to electrophoretically separate seven preterm birth biomarkers. One biomarker, thrombin-antithrombin III, cannot be purchased commercially so I developed methods for its assembly in the lab. Dot blots and mass spectrometry were used …

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Navigating Molecular Complexity: A Multidimensional Approach Utilizing Computational Chemistry, Jacob Andrew Parkman Jun 2023

Navigating Molecular Complexity: A Multidimensional Approach Utilizing Computational Chemistry, Jacob Andrew Parkman

Theses and Dissertations

Preparing molecular coordinate files for molecular dynamics (MD) simulations can be a very time-consuming process. Herein we present the development of a user-friendly program that drastically reduces the time required to prepare these molecular coordinate files for MD software packages such as AmberTools. Our program, known as charge atomtype naming (CAN), creates and uses a library of structures such as amino acid monomers to update the charge, atom type, and name of atoms in any molecular structure (mol2) file. We demonstrate the utility of this new program by rapidly preparing structural files for MD simulations for polypeptides ranging from small …

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Latter-Day Saint Women And Leadership In Higher Education: An Intrinsic Case Study, Elizabeth J. Darger Jun 2023

Latter-Day Saint Women And Leadership In Higher Education: An Intrinsic Case Study, Elizabeth J. Darger

Theses and Dissertations

There are few women in the highest levels of leadership in most industries, including higher education. This intrinsic case study provides insight into the leadership journeys of 15 female leaders at Brigham Young University, which is sponsored by The Church of Jesus Christ of Latter-day Saints. Four prevalent themes emerged about their leadership journeys. First, a leadership role was not part of the participant's life plan. The remaining three themes related to acceptance of a leadership role. Participants reported feeling nudged to consider a leadership role, feeling a sense of relational responsibility in accepting a leadership role, and receiving a …

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Group Therapy For Externalizing Behavior Problems In Youth: A Meta-Analysis, Rachel Anne Arnold Jun 2023

Group Therapy For Externalizing Behavior Problems In Youth: A Meta-Analysis, Rachel Anne Arnold

Theses and Dissertations

Externalizing behavior problems are a common concern among youth and can be associated with significant problems. As such, the need for effective treatment is evident. While research on psychosocial interventions has been promising, the specific efficacy of youth group therapy has not been assessed in a meta-analysis. Objectives: to assess group therapy's efficacy for youth with behavioral issues and whether treatment effects are moderated by study, patient, leader, or group characteristics. Method: major databases were used to identify and screen potential articles based on inclusion criteria. Included studied were analyzed in a random effects meta-analysis, and potential moderators were assessed. …

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The Effects On Self-Regulation And Productive English Proficiency Of The Application Of Mental Contrasting And Implementation Intention (Woop) In Esl Writing Classes, Ka Yue Chan Jun 2023

The Effects On Self-Regulation And Productive English Proficiency Of The Application Of Mental Contrasting And Implementation Intention (Woop) In Esl Writing Classes, Ka Yue Chan

Theses and Dissertations

The present study looked at the effects of a self-regulatory goal setting framework (WOOP) implemented in writing classes that were developed by Oettingen (2018) using Mental Contrasting and Implementation Intentions (MCII). The study examined English learners' development on self-reported self-regulation and proficiency levels in an Intensive English Program (IEP) in the United States over the course of two 14-week semesters. A total of 238 English Language Learners participated in the study and took the Short Self-Regulation Questionnaire (SSRQ) where the scores were analyzed to determine development over time. The analysis showed no statistically significant differences. However, experimental group participants' self-reported …

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Pivotal Response Treatment To Decrease Challenging Behavior And Increase Functional Communication In Preschool Children With Developmental Delays, Kalie Alexandra Gilmour Jun 2023

Pivotal Response Treatment To Decrease Challenging Behavior And Increase Functional Communication In Preschool Children With Developmental Delays, Kalie Alexandra Gilmour

Theses and Dissertations

After a review of the literature on Pivotal Response Treatment (PRT) in young children with developmental delays, less was known on its effects on challenging behavior and functional communication in preschool age children receiving services in a traditional public school. A multiple baseline design across three participants was used to evaluate the effects of PRT on the functional communication of three preschool students with developmental delays. Based on a functional analysis, we also observed the effects of PRT on challenging behavior. A visual analysis of the data revealed a functional relation between PRT and functional communication and provided promising evidence …

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Accounting For Oral Language Skills In Children With Dyslexia: A Systematic Review Of The Literature, Natalie Kay Olsen Miller Jun 2023

Accounting For Oral Language Skills In Children With Dyslexia: A Systematic Review Of The Literature, Natalie Kay Olsen Miller

Theses and Dissertations

Purpose: In the present study, we conducted a systematic review to determine whether studies involving children with dyslexia include the assessment of oral language skills in their assessment batteries across various professional disciplines. Overlooking assessment of oral language in children with dyslexia may result in the misinterpretation of research findings and applications to children who present with both dyslexia and Developmental Language Disorder (DLD) or experience secondary oral language deficits. Method: According to the Preferred Reporting Items for Systematic Reviews and MetaAnalyses (PRISMA) guidelines, we searched the Elsevier Scopus database and obtained and analyzed 764 articles, up to 40 articles …

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Soft Contact Lens Tear Film Proteomics For Clinical Diagnostic Biomarker Discovery, Robert Kimball Roden Jun 2023

Soft Contact Lens Tear Film Proteomics For Clinical Diagnostic Biomarker Discovery, Robert Kimball Roden

Theses and Dissertations

Human tear film is an accessible biospecimen rich with useful biological information. As tear protein biomarkers for both ocular and systemic diseases have been identified in tears, efforts are being made to create point-of-care tests useful for clinical diagnoses. However, there are significant obstacles to tear diagnostics, including inadequate sampling methods and biomarkers with insufficient sensitivity and specificity. Furthermore, tear film diagnostics are particularly challenging for dry eye disease (DED) patients, where low tear volume makes sampling more difficult and the multifactorial nature of DED makes identifying the exact pathological subtype very complex. As soft contact lenses (SCLs) are designed …

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The Performative History Of Tomboys In Anglophone Literature Prior To Little Women, Kimber Palmer Jun 2023

The Performative History Of Tomboys In Anglophone Literature Prior To Little Women, Kimber Palmer

Theses and Dissertations

This paper examines the expansive history of literary tomboys in the century preceding Louisa May Alcott's Little Women (1868). Applying concepts from gender performativity theory, it explores earlier and previously overlooked portrayals of tomboys (or, alternatively, "hoydens" or "romps"), especially in Richard Brinsley Sheridan's A Trip to Scarborough (1777), Isaac Bickerstaffe's The Romp; A Comic Opera in Two Acts (1786), Mary Wollstonecraft's A Vindication of the Rights of Woman (1792), Jane Austen's Northanger Abbey (1817), and E.D.E.N. Southworth's The Hidden Hand (1859). Because the tomboy phenomenon emphasizes that gender roles must be learned and can be resisted, tomboy characters are …

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Family Of Origin Stress, Posttraumatic Stress Symptoms, And Resource Loss For Couples During Covid-19: A Longitudinal Analysis, Betsy Hughes Barrow Jun 2023

Family Of Origin Stress, Posttraumatic Stress Symptoms, And Resource Loss For Couples During Covid-19: A Longitudinal Analysis, Betsy Hughes Barrow

Theses and Dissertations

The pandemic affected daily life on an unprecedented global scale resulting in the need for adaptation and flexibility to cope with ongoing stress, uncertainty, and loss that may affect couple relationships. Understanding resource loss in the context of mass stress events is critical because resource loss has been defined as the primary agent of stress (Hobfoll, 1989). As such, it is important to understand what factors may have shaped the degree of resource loss incurred during the pandemic. Extant research implies that considering early life adversity may be useful to explore as it may be a form of resource loss …

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Securing Wireless Communication Via Information-Theoretic Approaches: Innovative Schemes And Code Design Techniques, Morteza Shoushtari Jun 2023

Securing Wireless Communication Via Information-Theoretic Approaches: Innovative Schemes And Code Design Techniques, Morteza Shoushtari

Theses and Dissertations

Historically, wireless communication security solutions have heavily relied on computational methods, such as cryptographic algorithms implemented in the upper layers of the network stack. Although these methods have been effective, they may not always be sufficient to address all security threats. An alternative approach for achieving secure communication is the physical layer security approach, which utilizes the physical properties of the communication channel through appropriate coding and signal processing. The goal of this Ph.D. dissertation is to leverage the foundations of information-theoretic security to develop innovative and secure schemes, as well as code design techniques, that can enhance security and …

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Exploration Of The Impact Of Gender-Affirming Care And Social Support On Executive Functioning And Mental Health In Gender-Diverse Autistic And Non-Autistic Adults, Karys Michaela Normansell-Mossa Jun 2023

Exploration Of The Impact Of Gender-Affirming Care And Social Support On Executive Functioning And Mental Health In Gender-Diverse Autistic And Non-Autistic Adults, Karys Michaela Normansell-Mossa

Theses and Dissertations

Between 4.8% and 26% of adults presenting to gender dysphoria clinics have an autism diagnosis. Both autistic people and gender-diverse people have higher rates of mental health conditions including anxiety and depression and more difficulties with executive functioning, all of which impact quality of life. Some work suggests that gender affirmation leads to better mental health outcomes, including better executive functioning, but this has not been studied directly in autistic adults who identify as gender-diverse or transgender. As such, we elected to explore the relationships among these variables at this intersection of gender diversity and autism. In a sample of …

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Mental Health Literacy In Polynesian Native Hawaiians And Other Pacific Islanders: A Pilot Cross-Sectional Study, Kealoha Sarah Reiko Snow Jun 2023

Mental Health Literacy In Polynesian Native Hawaiians And Other Pacific Islanders: A Pilot Cross-Sectional Study, Kealoha Sarah Reiko Snow

Theses and Dissertations

Background: High prevalence of mental health problems and underutilization of mental health treatment are more severe among the Native Hawaiian and Other Pacific Islander (NHPI) population and remain misunderstood and understudied. Examining mental health literacy (MHL)–the knowledge and beliefs about mental disorders which aid their recognition, management, or prevention–has been shown to identify barriers to seeking and receiving care. Objectives: This study aimed to assess the level of MHL in Polynesian NHPIs and identify associated demographic variables. Methods: Data for this pilot cross-sectional study were collected from 298 US Polynesians via an online questionnaire of the Mental Health Literacy Scale …

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Ebi2, Rodney Till, Dr. Brian Poole Jun 2023

Ebi2, Rodney Till, Dr. Brian Poole

Journal of Undergraduate Research

My project this year was a great learning experience and helped me to better understand the complexity of lab work, as well as, the tools used in troubleshooting problems; including collaboration with lab researchers and professors. I learned about flow cytometry and how to analyze migration data. I also learned how to do transfections with HEK cells and how to separate B cells from a fresh sample of blood. I was thankful that I could spend time doing lab work because it’s the best teaching environment I know of in academia. I came across genuine problems and studied topics with …

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Design & Development Project Report: Chem-105 Oer Textbook, Abigail Boekweg Jun 2023

Design & Development Project Report: Chem-105 Oer Textbook, Abigail Boekweg

Instructional Psychology and Technology Graduate Student Projects

A report on a project to design and develop an open textbook for the BYU course CHEM-105 General College Chemistry. The project had two primary goals: to streamline the organization of the textbook and to enhance students' access to it.

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But What If It Was A Cartoon? Animated Instructional Videos For The California Debt And Investment Advisory Commission, Faith Jennings Jun 2023

But What If It Was A Cartoon? Animated Instructional Videos For The California Debt And Investment Advisory Commission, Faith Jennings

Instructional Psychology and Technology Graduate Student Projects

A case study of designing an animated instructional video on municipal finance for elected officials in California.

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Determining The Role Of Kaposi’S Sarcoma-Associated Herpesvirus Lana Protein In The Development Of Persistent Infection, Jamie Gardiner, Dr. Brad Berges Jun 2023

Determining The Role Of Kaposi’S Sarcoma-Associated Herpesvirus Lana Protein In The Development Of Persistent Infection, Jamie Gardiner, Dr. Brad Berges

Journal of Undergraduate Research

Kaposi’s Sarcoma-associated Herpesvirus (KSHV) is a human cancer virus that causes Kaposis’ sarcoma, the most common cancer found in AIDS patients. Our lab is working to develop humanized mice as a novel animal model to study KSHV infection and related diseases, since there has previously been no animal model established. The purpose of my project was to determine the role of the viral protein LANA (latencyassociated nuclear antigen) in establishing a latent KSHV infection in humanized mice. My project included two major aims:

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The Target Model For Genealogical Networks, Kolton Baldwin Jun 2023

The Target Model For Genealogical Networks, Kolton Baldwin

Theses and Dissertations

Several large-scale projects including FamilySearch, Ancestry, BALSAC (University of Quebec), and others have gathered incredible amounts of genealogical data ranging from millions to billions of individuals. To study the structure of this data, we propose a model that generates a genealogical network based on real-world genealogical data using two key features: (i) geodesic distance between couples prior to union and (ii) the number of children per couple. The distribution of the distance to a couples' nearest common ancestor in an observed community captures the global scale at which biological cycles form in the underlying genealogical network. Similarly, the number of …

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Fundamentals Of International Religious Freedom: An Open Access Asynchronous Online Course Design, Johanna Chan Jun 2023

Fundamentals Of International Religious Freedom: An Open Access Asynchronous Online Course Design, Johanna Chan

Instructional Psychology and Technology Graduate Student Projects

The International Center for Law and Religion Studies (ICLRS) associated with the J. Reuben Clark Law School, has presented religious freedom training around the world to government officials, non-governmental organization (NGO) leaders, scholars, and others. The purpose of this project was to redesign their original training presentations into an openly accessible asynchronous online course. The content for this online course has previously been used in live instruction (in the form of brief lesson plans and PowerPoints), including a presentation of six two-hour sessions to 100 Guatemalan human rights officials. Live training on religious freedom was previously completed in China, Myanmar, …

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Shortening Remediation Time In A University Excel Course Through Custom, Automated Feedback, Kainalu Barino Jun 2023

Shortening Remediation Time In A University Excel Course Through Custom, Automated Feedback, Kainalu Barino

Instructional Psychology and Technology Graduate Student Projects

This project aimed to implement an automated feedback tool for students taking IS 110. Implementing a feedback tool was identified by a previous research group as one of the best ways to shorten remediation time (Colby, 2018, p. 1). They chose a design for their feedback tool that resulted in faster turn-around times and better scores on assignments, but their design did not improve test results by a significant margin. Our project redesigned the feedback tool in the hope that it not only maintains the benefits of the previous tool, but achieves long term learning results as well.

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