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2022

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Transient Sources And How To Study Them: Selected Topics In Multi-Messenger Astronomy, Jiawei Luo Dec 2022

Transient Sources And How To Study Them: Selected Topics In Multi-Messenger Astronomy, Jiawei Luo

UNLV Theses, Dissertations, Professional Papers, and Capstones

The discovery of cosmic neutrino flux by IceCube, and the multi-messenger observations of gravitational event GW170817 ushered in the era of multi-messenger astronomy. Since the Universe itself is a natural laboratory, multi-messenger astronomy can help us study the most extreme physics processes in great detail. In this dissertation, we touch on some of the currently unanswered questions involving different types of transient sources and different “messengers” of multi-messenger astronomy. We employ a variety of analysis methods, including machine learning, a method that has not yet been widely adopted in astronomy but is rapidly gaining momentum.We start this dissertation with Chapter …

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Automated Approach For The Enhancement Of Scaffolding Structure Monitoring With Strain Sensor Data, Sayan Sakhakarmi Dec 2022

Automated Approach For The Enhancement Of Scaffolding Structure Monitoring With Strain Sensor Data, Sayan Sakhakarmi

UNLV Theses, Dissertations, Professional Papers, and Capstones

Construction researchers have made a significant effort to improve the safety of scaffolding structures, as a large proportion of workers are involved in construction activities requiring scaffolds. However, most past studies focused on design and planning aspects of scaffolds. While limited studies investigated scaffolding safety during construction, they are limited to simple cases only with limited failure modes and simple scaffolds. In response to this limitation, this study aims to develop an automated scaffold monitoring approach capable of monitoring large scaffolds. Accordingly, this study developed an automated scaffold safety monitoring framework that leverages sensor data collected from a scaffold, scaffold …

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Comparing Forgetting Rates Between Pattern Separation And Item Recognition, Rhiannon N. Soriano Smith Dec 2022

Comparing Forgetting Rates Between Pattern Separation And Item Recognition, Rhiannon N. Soriano Smith

UNLV Theses, Dissertations, Professional Papers, and Capstones

Recent theories of forgetting posit that hippocampally-based memory representations are more prone to be forgotten due to decay, while extra-hippocampal representations are more likely to be forgotten due to interference (Hardt, Nader, & Nadel, 2013; Sadeh & Pertzov, 2020). The current study examined this hypothesis by comparing the rate of forgetting between pattern separation, a hippocampally-based process, and item recognition, a process that is reliant on both hippocampal and extra-hippocampal structures. It was hypothesized that pattern separation would display more forgetting due to decay because it is a hippocampally-based process, while item recognition would display more forgetting due to interference …

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Development And Application Of A Safety Index For Transit Stops: A Case Study From Las Vegas, Nevada, Rithesh Shivuni Dec 2022

Development And Application Of A Safety Index For Transit Stops: A Case Study From Las Vegas, Nevada, Rithesh Shivuni

UNLV Theses, Dissertations, Professional Papers, and Capstones

This research developed a methodology to evaluate safety proximate to transit stops through a Safety Index, identified key factors associated with fatal crashes proximate to bus transit stops, and illustrated the applications of these using a case study based on the Las Vegas metropolitan area in Nevada, USA. The methodology is based on motor vehicle crashes that involve pedestrians recorded in the proximity of transit stops, and the severity of the crash outcomes. It focused on crashes which involved pedestrians that occurred within walking distances of individual transit stops. The severity of the crash outcomes was classified based on the …

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Jiapi: A Type Checker Generator For Statically Typed Languages, Benjamin Cisneros Merino Dec 2022

Jiapi: A Type Checker Generator For Statically Typed Languages, Benjamin Cisneros Merino

UNLV Theses, Dissertations, Professional Papers, and Capstones

Type systems are a key characteristic in the context of the study of programming languages. They frequently offer a simple, intuitive way of expressing and testing the fundamental structure of programs. This is especially true when types are used to provide formal, machine-checked documentation for an implementation. For example, the absence of type errors in code prior to execution is what type systems for static programming languages are designed to assure, and in the literature, type systems that satisfy this requirement are referred to as sound type systems. Types also define module interfaces, making them essential for achieving and maintaining …

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Examination Of The Relationship Between Loneliness And Binge Eating Symptoms, Kimberly Stevens Dec 2022

Examination Of The Relationship Between Loneliness And Binge Eating Symptoms, Kimberly Stevens

UNLV Theses, Dissertations, Professional Papers, and Capstones

Loneliness is implicated in several mental health conditions and may also be linked to eating pathology, like binge eating symptoms (e.g., loss-of-control eating). However, the pathways by which loneliness might be associated with binge eating symptoms are less well understood. Preliminary evidence suggests perceived stress may be a key explanatory pathway. Specifically, perceived stress mediates the impact of loneliness on other mental health outcomes and is associated with increased risk of binge eating symptoms. This study investigated relationships between loneliness, perceived stress, and binge eating symptoms and tested whether heightened levels of binge eating was accounted for by increases in …

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A Control Integrated Circuit For A Hysteretic Flyback Power Converter, Armani Alvarez Dec 2022

A Control Integrated Circuit For A Hysteretic Flyback Power Converter, Armani Alvarez

UNLV Theses, Dissertations, Professional Papers, and Capstones

This Thesis reports the design, simulation, and layout of a switching power supply controller chip for a fly-back switching power supply. The controller chip was designed using ON’s Semiconductor C5 process. The resulting switching power supply using the controller chip consists of using various off-chip components such as a power MOSFET, transformer, and capacitors. The main components used in the integrated circuit include a bandgap reference voltage circuit which outputs a reference voltage of 1.25V, a ring oscillator having a nominal frequency of 5MHz, a high-gain comparator, and a buffer that can drive a 5pF capacitor. Under normal simulation conditions …

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Activity-Based Intervention And One-To-One Correspondence For Children With Developmental Delays, Cyndy Anang Dec 2022

Activity-Based Intervention And One-To-One Correspondence For Children With Developmental Delays, Cyndy Anang

UNLV Theses, Dissertations, Professional Papers, and Capstones

PreK children with developmental delays in inclusive classrooms need access to math interventions helps them develop foundational math skills that are needed to succeed during their K-12 education. Research is significantly lacking that addresses increasing math skills for children with disabilities in PreK classrooms. The purpose of this study was to examine how using activity-based intervention (ABI) increases one-to-one correspondence for children with disabilities in an inclusive classroom. A single subject multiple probe design across participants was implemented to embed one-to-one correspondence math goals into daily routines and preferred activities. The participants of the study were two 3–5-year-old children categorized …

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Exploring The Role Of Epistemic Cognition And Self-Efficacy In The Career Decision-Making Processes Of College Students: An Explanatory Sequential Study, Raelynn Frazier Dec 2022

Exploring The Role Of Epistemic Cognition And Self-Efficacy In The Career Decision-Making Processes Of College Students: An Explanatory Sequential Study, Raelynn Frazier

UNLV Theses, Dissertations, Professional Papers, and Capstones

College students are asked to make critical decisions about which academic major to choose and subsequently to make specific career decisions. Students come to college with a myriad of different skill sets, backgrounds, developmental levels, cognitive processes, familial support, and levels of self-efficacy that may influence how they make these decisions. The purpose of this study was to explore the role that epistemic cognition and self-efficacy may play in the career decision-making processes of college students utilizing a mixed methods approach. Results of this study indicate that there are internal and external influences that impact college students’ career decision-making processes …

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Exploring The Attitudes And Perceptions Of Educators Regarding Disabled Students In The Inclusive Classroom, Christopher Closson Dec 2022

Exploring The Attitudes And Perceptions Of Educators Regarding Disabled Students In The Inclusive Classroom, Christopher Closson

Masters Theses and Doctoral Dissertations

This mixed methods study was designed to investigate teachers’ perceptions and attitudes regarding students with disabilities in the inclusive classroom. According to Hogan, Lohmann, and Champion (2013), inclusive classrooms are now the norm in many K-12 schools across the United States, which has made the job of general education teachers all the more difficult. This study examined educator attitudes and perceptions in three northeast Tennessee school districts, regarding disabled students in the inclusive classroom. Teachers with a clear understanding of their perspectives toward inclusion are better able to establish classrooms with full inclusion and provide students with disabilities an education …

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Differences In Elementary Students’ Self-Regulated Processes For Computer Versus Printed Reading Assignments, Katerina Sergi, Anastasia Elder, Tianlan Wei, Kristin Javorsky, Jianzhong Xu Dec 2022

Differences In Elementary Students’ Self-Regulated Processes For Computer Versus Printed Reading Assignments, Katerina Sergi, Anastasia Elder, Tianlan Wei, Kristin Javorsky, Jianzhong Xu

Publications

The purpose of this study was to investigate metacognitive self-regulated learning (SRL) differences in computer- and paper-based reading assignments across elementary students. Students in two after-school programs in a southeastern U.S. public school district were recruited. The final sample consisted of 48 students in Grades 2–5 who participated in two counterbalanced conditions involving a computer- and a paper-based reading assignment. The study employed a 2 x 4 (condition-by-grade) mixed-model analysis of variance (ANOVA) and followup tests to examine metacognitive SRL differences between conditions and grades. The results indicate that elementary students used various metacognitive SRL skills across both conditions. The …

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Spf-R Online User Guide, Eric Green, Paul Ross, Christopher Blackden, William Staats, Reginald Souleyrette Dec 2022

Spf-R Online User Guide, Eric Green, Paul Ross, Christopher Blackden, William Staats, Reginald Souleyrette

Kentucky Transportation Center Research Report

SPF-R Online greatly improves and simplifies the SPF development process. Building on the original SPF-R script, the online tool eliminates many of the technical barriers associated with the original process, allowing for a much larger audience to take advantage of SPF-R’s capabilities. Like the original SPF-R script, SPF-R Online lets users quickly explore the effect of roadway network heterogeneity on SPF development, compare CURE plots , and compare goodness-of-fit measures to decide which SPF is most appropriate for a given dataset.

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Sro Roles And Teacher Behavioral Intervention Strategies: An Analysis On Behavioral Approaches And Student Suspensions., Ivan Benitez Dec 2022

Sro Roles And Teacher Behavioral Intervention Strategies: An Analysis On Behavioral Approaches And Student Suspensions., Ivan Benitez

Electronic Theses and Dissertations

Recently there have been nationwide calls for schools to end their contracts with local police departments in efforts to remove school resource officers (SROs) due to their criminalizing effect on students. Aiming towards racial equity in safety and discipline, advocates have suggested re-envisioning discipline through a restorative lens to minimize student harm. One approach which has been promising in student outcomes are behavioral intervention strategies. The current study contributes to the literature by examining the direct effects of SRO roles and teacher behavioral intervention strategies on student suspensions. Using factor analysis, I found three SRO roles: law enforcement officer, mentor, …

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Rehabilitation Length Of Stay In Individuals With Spinal Cord Injury Paraplegia., Sahal Alzahrani Dec 2022

Rehabilitation Length Of Stay In Individuals With Spinal Cord Injury Paraplegia., Sahal Alzahrani

Electronic Theses and Dissertations

Background: Spinal Cord Injury (SCI) is associated with functional and physical limitations as well as psychological challenges. Rehabilitation care is crucial to SCI individuals’ overall health. It is recommended that individuals with SCI receive an intensive and early rehabilitation care to improve their health and avoid medical complications. Hospitals and rehabilitation facilities use length of stay (LOS) as a proxy to quantify rehabilitation care and a measure for quality of care. Objectives: This dissertation has three aims: 1) to identify factors associated with rehabilitation LOS in paraplegia populations, 2) to examine trends of inpatients rehabilitation LOS in SCI paraplegia between …

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The Impact Of Volatile Organic Compound Exposure On Subclinical Biomarkers Of Cardiovascular Injury., Breandon Taylor Dec 2022

The Impact Of Volatile Organic Compound Exposure On Subclinical Biomarkers Of Cardiovascular Injury., Breandon Taylor

Electronic Theses and Dissertations

Pollution has been identified as the leading environmental cause of non-communicable disease and premature deaths globally. Volatile organic compounds (VOCs) are gaseous chemical constituents of pollution derived from a variety of sources, including industrial solvents and byproducts, automobile exhaust, tobacco smoke, cleaning supplies, and personal care products. VOCs are also abundant at various Superfund and Hazardous Waste Sites. Emerging data suggest that VOC exposure is associated with several adverse health outcomes, including cardiovascular disease (CVD). VOCs and their metabolites can potentially damage the endothelial lining of blood vessels, resulting in perturbed vascular function and vascular inflammation. We hypothesize that VOC …

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Foreign Policy In Media: An Examination Of The Captain America Films., Kat Hernandez Dec 2022

Foreign Policy In Media: An Examination Of The Captain America Films., Kat Hernandez

Electronic Theses and Dissertations

Popular culture and media are consumed daily by billions around the world, media which can contain meaningful and politically relevant material. The three Captain America films from the 2010s represent this phenomenon in the presentation of Captain America as a nationalist superhero with geopolitically relevant storylines. The direction and production of these films illustrate significant parallels to foreign policy choices of the United States. Through an interpretive analysis of the Captain America films: Captain America: The First Avenger, Captain America: The Winter Soldier, and Captain America: Civil War, this project seeks to analyze Captain America’s image and …

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The Role Of Mri In Diagnosing Autism: A Machine Learning Perspective., Yaser Elnakieb Dec 2022

The Role Of Mri In Diagnosing Autism: A Machine Learning Perspective., Yaser Elnakieb

Electronic Theses and Dissertations

There is approximately 1 in every 44 children in the United States suffers from autism spectrum disorder (ASD), a disorder characterized by social and behavioral impairments. Communication difficulties, interpersonal difficulties, and behavioral difficulties are the top common symptoms. Even though symptoms can begin as early as infancy, it may take multiple visits to a pediatric specialist before an accurate diagnosis can be made. In addition, the diagnosis can be subjective, and different specialists may give different scores. There is a growing body of research suggesting differences in brain development and/or environmental and/or genetic factors contribute to autism development, but scientists …

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A Mixed Methods Assessment Of Menstrual Hygiene Management And School Attendance Among Schoolgirls In Edo State, Nigeria., Madeline Tomlinson Dec 2022

A Mixed Methods Assessment Of Menstrual Hygiene Management And School Attendance Among Schoolgirls In Edo State, Nigeria., Madeline Tomlinson

Electronic Theses and Dissertations

Menstrual hygiene in lower-middle-income countries (LMICs) is limited and has been linked to many health, educational and social effects. However, the prevalence, details, and impact of menstrual hygiene management have not been well characterized in rural and peri-urban settings across Nigeria. The overall purpose of this research was to investigate menstrual hygiene management (MHM) among adolescent schoolgirls in peri-urban areas of Edo State, Nigeria; and to determine the educational consequences associated with poor MHM. MHM was measured using previously validated questions that were adapted after a formative assessment of MHM within the Edo State community. We used a mixed methods …

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Self-Regulation In Young School-Aged Children With Williams Syndrome., Holley Arnold Dec 2022

Self-Regulation In Young School-Aged Children With Williams Syndrome., Holley Arnold

Electronic Theses and Dissertations

My dissertation included two manuscripts which broadly focused on the self-regulation abilities of young school-aged children with Williams syndrome (WS), a rare neurodevelopmental disorder. Children with WS often exhibit mild to moderate intellectual disability (Kozel et al., 2021), impairments in behavioral and emotional regulation (Greiner de Magalhães et al., 2022), low effortful control (Leyfer et al., 2012), and deficits in adaptive skills (Brawn & Porter, 2018). In the first manuscript, the performance of children with WS on a gift-wrap delay of gratification task was characterized. In the second manuscript, the concurrent effects of the ability to regulate emotions, the ability …

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Iot In Smart Communities, Technologies And Applications., Muhammad Zaigham Abbas Shah Syed Dec 2022

Iot In Smart Communities, Technologies And Applications., Muhammad Zaigham Abbas Shah Syed

Electronic Theses and Dissertations

Internet of Things is a system that integrates different devices and technologies, removing the necessity of human intervention. This enables the capacity of having smart (or smarter) cities around the world. By hosting different technologies and allowing interactions between them, the internet of things has spearheaded the development of smart city systems for sustainable living, increased comfort and productivity for citizens. The Internet of Things (IoT) for Smart Cities has many different domains and draws upon various underlying systems for its operation, in this work, we provide a holistic coverage of the Internet of Things in Smart Cities by discussing …

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Mejorar La Raza: Measuring The Implicit Anti-Black Racial Bias Of Multiracial Individuals., Katalina Traxler Dec 2022

Mejorar La Raza: Measuring The Implicit Anti-Black Racial Bias Of Multiracial Individuals., Katalina Traxler

Electronic Theses and Dissertations

This dissertation sought to examine if there are implicit anti-Black racial bias differences across multiracial people who identify as Black/White compared to multiracial people who do not identify as Black/White, accounting for age, citizenship, and education level. It was also determined if age, citizenship status, and education level moderate the relationship between multiracial identity and implicit anti-Black racial bias. The theories guiding this dissertation were: Heider’s Balance Theory, Multiracial Identity Development, and White Identity Development. The data were collected from Project Implicit, a non-profit organization and international collaborative of researchers who are interested in implicit social cognition. The data analysis …

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Increasing Self-Determination Skill Through Behavioral Skills Training For Individuals With Extensive Support Needs To Examine Reversible Contraceptive Choices., Jennifer Pollard Dec 2022

Increasing Self-Determination Skill Through Behavioral Skills Training For Individuals With Extensive Support Needs To Examine Reversible Contraceptive Choices., Jennifer Pollard

Electronic Theses and Dissertations

There is a long history of individuals with extensive support needs (ESN) being sterilized without their knowledge and consent. Students with ESN are defined as individuals who need continuous and widespread supports necessary for academic, communication, and/or daily living skills. These individuals typically have more than one diagnosis including a developmental disability (DD), intellectual disability (ID), and/or traumatic brain injury (Kurth et al., 2019; Taub et al., 2017). Part of the reason this is able to occur is due to a lack of education about sexual development and a lack of interventions to build skills related to self-determination or informed …

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Statistical Methods For Meta-Analysis In Large-Scale Genomic Experiments, Wimarsha Thathsarani Jayanetti Dec 2022

Statistical Methods For Meta-Analysis In Large-Scale Genomic Experiments, Wimarsha Thathsarani Jayanetti

Mathematics & Statistics Theses & Dissertations

Recent developments in high throughput genomic assays have opened up the possibility of testing hundreds and thousands of genes simultaneously. With the availability of vast amounts of public databases, researchers tend to combine genomic analysis results from multiple studies in the form of a meta-analysis. Meta-analysis methods can be broadly classified into two main categories. The first approach is to combine the statistical significance (pvalues) of the genes from each individual study, and the second approach is to combine the statistical estimates (effect sizes) from the individual studies. In this dissertation, we will discuss how adherence to the standard null …

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Atlantic Surfclam (Spisula Solidissima) Population Demographics And Distribution Along The Middle Atlantic Bight, Mauricio González Díaz Dec 2022

Atlantic Surfclam (Spisula Solidissima) Population Demographics And Distribution Along The Middle Atlantic Bight, Mauricio González Díaz

OES Theses and Dissertations

The Atlantic surfclam (Spisula solidissima) is a long-lived benthic biomass dominant organism that occurs on the Middle Atlantic Bight (MAB) continental shelf between 10 m and 50 m. Trends in Atlantic surfclam population specific growth and mortality rates were analyzed using four decades of age and length observations obtained from NOAA stock surveys from the 1980s to 2010s in six regions distributed along the MAB. Atlantic surfclam specific growth rates and asymptotic lengths were estimated from the age and length observations using the von Bertalanffy growth model. The analysis showed that the Atlantic surfclam median asymptotic length in …

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The Effects Of Body Posture On Vigilance Performance, Jeremiah Gabriel Ammons Dec 2022

The Effects Of Body Posture On Vigilance Performance, Jeremiah Gabriel Ammons

Psychology Theses & Dissertations

Drivers of vehicles that use a driving automation system were tasked with supervising the vehicle to ensure it was functioning properly. This task required drivers to stay vigilant of the roadway while being ready to intervene in the case of an unexpected hazard that the driving automation system may not have detected. This study investigated whether reclining a drivers’ seatback to more comfortable postures would affect their vigilance performance over time. Vigilance performance was measured by correct detections, false alarms, response sensitivity, response bias, and response time to hazardous events. Forty-five participants were recruited and randomly assigned to a postural …

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Esl To Composition Transitions: Investigating The Differences In Disciplinary Values Among Two-Year College Faculty, Amy M. Flessert Dec 2022

Esl To Composition Transitions: Investigating The Differences In Disciplinary Values Among Two-Year College Faculty, Amy M. Flessert

English Theses & Dissertations

In this qualitative methods study, I draw on Paul Kei Matsuda’s 1999 article “Composition Studies and ESL Writing: A Disciplinary Division of Labor” to examine if, more than 20 years after its publication, there is still a significant disciplinary division between ESL writing and first-year college composition. I surveyed writing instructors from both ESL and ENG at Mid-Atlantic Community College (MACC) regarding what they value as “good” writing. I also worked with three faculty members – one in ENG, one in ESL, and a third who teaches in both departments, serving, in this study and the department, as a “bridge” …

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A Nexus Of Literate Activity: The Design Of Writing Assignments In The Disciplines, Lauriellen Stankavich Dec 2022

A Nexus Of Literate Activity: The Design Of Writing Assignments In The Disciplines, Lauriellen Stankavich

English Theses & Dissertations

Writing plays a critical role in higher education as students are inducted into disciplinary practices through different genres, methodological repertoires and argumentation strategies. In Writing Across the Curriculum (WAC) initiatives, the instructor serves as an embodied reservoir of disciplinary knowledge and an arbiter of literate practices but most crucially employs the mediating capacities of the writing assignment as a potent pedagogical nexus. In this practice space, the instructor acts as designer of the pedagogical experience—the course as a whole and writing assignments in particular. This study used interviews, survey, and the collection of syllabi and other instructional artifacts to examine …

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T-Cell Antigen Receptors In Multiple Sclerosis, Lisa Lanée Keyes Jones Dec 2022

T-Cell Antigen Receptors In Multiple Sclerosis, Lisa Lanée Keyes Jones

Biomedical Sciences Theses & Dissertations

Multiple Sclerosis (MS) is T-cell mediated autoimmune disease characterized by inflammation, demyelination, and degeneration of axons in the brain and spinal cord. A T cell-mediated immune response in MS is directed against myelin components and possibly other antigens in genetically susceptible individuals and is triggered by a viral infection. The T-cell antigen receptor (TCR) on T cells is responsible for antigen recognition and determines specificity. Our overall hypothesis is to determine whether clonally expanded T cells in patients with MS recognize viral or self-antigens and to determine whether molecular mimicry is involved in the development of the disease. To study …

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Kinetic Simulations Of Active Nematic Polymers In Channel Flow, Lacey Savoie Schenk Dec 2022

Kinetic Simulations Of Active Nematic Polymers In Channel Flow, Lacey Savoie Schenk

Mathematics & Statistics Theses & Dissertations

Suspensions of active nematic liquid crystalline polymers exhibit complex phenomena such as spontaneous flows, pattern formations, and defects. They have many applications in industry, commercial settings, and our daily lives. We employ the Kinetic Model for our research, an extensive model that couples the Smoluchowski Equation and the incompressible Navier-Stokes Equations to solve for the active nanorod number density function–a function dependent on the polymer’s physical orientation and space at a given time. Using this function, we can derive the polymer’s polarity and nematic orientations as well as other rheological properties. In this research, we conduct numerical simulations of active, …

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The Design And Development Of A Miniature Gridded Ecr Ion Thruster, Nicholas Nuzzo Dec 2022

The Design And Development Of A Miniature Gridded Ecr Ion Thruster, Nicholas Nuzzo

Masters Theses

Plasma propulsion, a specific subset of electric propulsion (EP), is a class of space propulsion that produces plasma by excitation of a propellant at or above its ionization energy. This ionized propellant is then accelerated by an externally applied field (magnetic and/or electric) and produces thrust. There is an increasing need for miniaturization in spacecraft technology and the use of plasma EP devices in space propulsion. These systems provide an advantage over traditional chemical propulsion solutions which are less efficient and have more mass. Miniaturization of EP devices allows missions to have more space and mass available for their payloads …

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