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Axon Initial Segment Morphology Across Typical Cortical Development And In Mouse Models Of Neurodevelopmental Disorders With A High Incidence Of Epilepsy, Rachel Ali Rodriguez

UNLV Theses, Dissertations, Professional Papers, and Capstones

Neurodevelopmental disorders (NDDs) are commonly associated with a high incidence of epileptic seizures which result from excessive firing of neurons. The axon initial segment (AIS) is a neuronal compartment essential for the control of activity patterns of neurons. The AIS undergoes important modifications during development, but the molecular mechanisms that affect the development, morphology, and protein composition of the AIS are still not well understood. We examined AIS morphology of medial prefrontal cortex (mPFC) pyramidal neurons in wildtype mice across development and in two mouse models of NDDs. Results indicate restructurings at the AIS during typical development, some of which …

Racial/Ethnic Disparities In Mental Health Diagnosis Of Maltreated Youth, Shadie Burke

UNLV Theses, Dissertations, Professional Papers, and Capstones

Racial/ethnic marginalized youth are more likely to receive a misdiagnosis of a mental health disorder than their White peers. Misdiagnosis contributes to existing disparities for racial/ethnic marginalized groups by leading to longer durations of untreated and worsening mental health symptoms. For maltreated youth, receiving a misdiagnosis can lead to a failure to connect with appropriate mental health services, medication regimens, therapeutic foster homes, and academic and developmental resources. To date, very few empirical studies have identified disparities in mental health diagnosis among racial/ethnic marginalized maltreated youth. The present study examined two key research questions: (1) what racial/ethnic disparities in diagnoses …

Physiological And Mechanical Comparisons Between Clipless And Flat Pedals, Katelyn Conroy

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this study was to investigate the physiological and mechanical comparisons between clipless and flat pedals. Participants (n=4) completed two at-home 20-minute FTP tests: using clipless and flat pedals using Zwift. The order of conditions were randomized for each participant. Participants used their personal Smart Trainers, clipless pedals, and cycling shoes while flat pedals were provided (Syun-LP, Road Bike Platform Pedals). Power, heart rate and cadence were recorded and used for analysis. All dependent variables were compared using paired t-tests. Power was significantly greater for clipless (226.7 ± 46.2 W) vs. flat (215.2 ± 41.8 W) pedals (p …

Rail Fixed Guideway Systems In Western U.S. Regions, Kelly A. Beavers

UNLV Theses, Dissertations, Professional Papers, and Capstones

This research explores the policy factors influencing the intraregional development of rail transit. For the purpose of this research, policy factors include: institutional arrangements, factors associated with governance, and factors in the policymaking process. The research questions are studied in five case study MSAs within the Pacific West and Mountain West regions of the United States: Phoenix-Mesa-Chandler, AZ; Denver-Aurora-Lakewood, CO; Riverside-San Bernardino-Ontario, CA; Los Angeles-Long Beach-Anaheim, CA; and Portland-Vancouver-Hillsboro, OR. The foundational problems that frame this research are the challenges of urban planning at a regional scale, specifically for transportation. The more specific challenge of transportation planning is situated within …

The Spark That Lit The Match: The Use Of Petitions And The Emergence Of Antislavery Politicians In The Movement To Abolish Slavery In The District Of Columbia, 1816-1829, Timothy Brown

UNLV Theses, Dissertations, Professional Papers, and Capstones

The United States capital, Washington, D.C., became the focus of antislavery advocates in their quest to eliminate the domestic slave trade and slavery. By the War of 1812, the domestic slave trade was thriving in the capital. However, many saw it as particularly embarrassing to a nation predicated on the concept of freedom. This embarrassment was even felt by proslavery Southerners. Beginning in 1816, an attempt to restrict the trade in the Capital occurred when Virginia Congressman John Randolph called for the destruction of the domestic slave trade there. Despite being proslavery, he argued that the federal government, as the …

The Implementation Of Tribal Provisions From The Vawa 2013 Reauthorization, Deejay E. Chino

UNLV Theses, Dissertations, Professional Papers, and Capstones

Recent changes in VAWA allows tribes – for the first time – to prosecute non-Indians for intimate partner violence. In order to do so, however, tribes have to first meet specific federal mandates. Implementation of federal regulatory policy by American Indian tribes is a dynamic and complex process but there is a dearth of information on the challenges tribes face or on factors that would facilitate successful implementation at the tribal level. This legislation has filled a serious gap in tribal jurisprudence but not all tribes are able to meet requirements, which include having specific legal codes and justice resources. …

Identifying Risk Factors For Ptsd Symptom Clusters In Maltreated, Multiracial Youth Using Nonparametric Modeling, Mallory Constantine

UNLV Theses, Dissertations, Professional Papers, and Capstones

Multiracial youth are one of the most at-risk racial groups for child maltreatment. Multiracial individuals are also more likely to report mental health concerns than other racial or ethnic groups. This study aimed to identify demographic and psychological risk factors that are unique to multiracial, maltreated youth with respect to PTSD symptoms (i.e., re-experiencing, hyperarousal, avoidance) through classification and regression tree (CART) analyses. Participants included 99 multiracial, maltreated youth directly following their placement in an emergency group shelter due to substantiated maltreatment. The first hypothesis was that female gender, English first language, questions related to guilt and self-blame, and depressive …

From Language Comprehension Towards General Ai, Binay Dahal

UNLV Theses, Dissertations, Professional Papers, and Capstones

Language comprehension or more formally, natural language understanding is one of the major undertakings in Artificial Intelligence. In this work, we explore a few of the problems in language understanding using fixed deep learning models. Specifically, first, we look into question generation. Asking questions relates to the cognitive ability of language comprehension and context understanding. For that reason, making progress in question generation is significant. We introduce a novel task called “question generation with masked target answer” and propose various models and present the baseline result for the task. Next, we extend on the question generation task and develop a …

Party Central: Networks, Influence, And Party Change In The Us House Of Representatives, Sean M. Goff

UNLV Theses, Dissertations, Professional Papers, and Capstones

For decades, scholars have devoted considerable attention to the causes and processes of party change. In this dissertation, I offer a new theoretical framework that not only takes into account the behavior of Members of Congress, but also how that behavior is constrained and conditioned by the relationships they share with other Members. This web of relationships forms a party network, the structure of which changes as Member-to-Member relationships change over time. I also identify three mechanisms of party change: a Member of Congress shifting their position to align with another (assimilation); a Member being pushed to the periphery of …

The Archetypal Female Image In Chinese National Opera: A Study Of Xi Shi, Xin Guo

UNLV Theses, Dissertations, Professional Papers, and Capstones

In contrast to traditional Chinese operas, the history of Chinese National Opera1 is only a few decades long. Some scholars believe that many Chinese operas are feminist and female-centered. However, from the aesthetic standard of women’s voice to the female character’s inner world, it is hard to say that one can describe these operas as feminist simply because women play leading roles or the female arias are more than male. This document will explain the observation by analyzing the portrayal of female archetypes in Chinese national opera and discussing how opera Xi Shi complies with or subverts the portrayal. The …

How Long-Term, Non-Monogamous Romantic Relationships Maintain Sexual Satisfaction, Anna Kessler

UNLV Theses, Dissertations, Professional Papers, and Capstones

Eroticism is an important element of couple's relationships. Sexual intimacy has the power to bring couples closer together, as higher levels of sexual intimacy results in higher relationship satisfaction, or hinder relationships if either or both partners aren’t sexually satisfied in their relationship. The current study’s purpose is to understand how long-term, non-monogamous relationships have successfully maintained “eroticism” throughout the course of their relationship. In this study, 24 couples who are in a committed, romantic relationship of at least 7 years were interviewed. The interviews were conducted individually over a video call platform, and each was completed withing approximately 60 …

Polyvinyl Chloride Gels: Theoretical Modeling Of Their Actuation Mechanism And Characterization Of Their Properties, Zachary Frank

UNLV Theses, Dissertations, Professional Papers, and Capstones

Polyvinyl chloride (PVC) gels are an electroactive polymer smart material which has been considered in a variety of actuator applications. Their large deformation, fast response rates, optical transparency, and soft nature has made them a key area of interest in fields ranging from soft robotics to optics. PVC gels are made from PVC mixed with large quantities of plasticizer, such as dibutyl adipate (DBA). When a voltage is applied, the gel experiences an “anodophilic” deformation (in which it moves preferentially towards the anode). This unique characteristic is the result of a charge buildup near the anode surface, which creates electromechanical …

Improving Pedestrian Safety With The Implementation Of The Demand-Responsive Transverse Rumble Strip As A New Traffic Safety Countermeasure, Md Shakhawat Hossen

UNLV Theses, Dissertations, Professional Papers, and Capstones

The traditional TRS has been extensively used as a traffic calming device to provide cognitive alerts in the form of sound and vibration to drivers. However, TRS always remains fixed on the road and thus exerts cognitive alerts, irrespective of any potential downstream hazards. Moreover, the continuous exposure to rumble strips has been identified as a source of discomfort and annoyance for drivers, which limits its application to potentially useful scenarios. This study explores a rumble strip design with dynamic behavior named as Demand-Responsive Transverse Rumble Strip (DRTRS) in order to address the limitations of static TRS. The study incorporates …

How Can We Reduce Racism? A Mixed Method Study Of Factors That Influence Attitudes Towards Social Change, Kindy Insouvanh

UNLV Theses, Dissertations, Professional Papers, and Capstones

The resurgence of social movements such as Black Lives Matter has provoked public discourse about racial inequality and efforts towards social change. The current study sought to better understand how young adults reason about racism reduction with a focus on racial allyship and collective action. The present study used mixed methods to identify strategies young adults believe different racial groups could do to reduce racism and investigate the influence that individual factors have on reasoning about social change. Here, I present emergent themes to describe racism reduction strategies from a large and racially diverse sample of undergraduate students (N= 428). …

Social Media Activism: Did We Say What We Meant To Say? A Thematic Analysis Of Slutwalk Los Angeles Hosted By Amber Rose, Yahindra Maxey

UNLV Theses, Dissertations, Professional Papers, and Capstones

This study examined the convergence of activism and social media to analyze how messages are conveyed using an online platform. Using the official Instagram page of SlutWalk Los Angeles as the object of study, this paper examined what messages were being communicated online and how it reflected the movement. As social activism continues today, this study is relevant because it will provide insight on using visual imagery as a form of protest. Through thematic analysis, several themes emerged which include, inclusion, sexual liberation, re-appropriation, and rape awareness. These themes are explored and detailed, ultimately confirming the complex, polysemic nature of …

Calculating The Learning Rate Of A Neural Network Using A Genetic Algorithm, Eric Miller

UNLV Theses, Dissertations, Professional Papers, and Capstones

In the field of Computer Science, neural networks and genetic algorithms have become very popular tools in solving complex problems. Because of this growing popularity, there has been several attempts to combine the two concepts. Some of these attempts focused on using genetic algorithms to determine the best architecture, starting weights, or feature selection, to name of few of the applications. While a lot of the research that is available focuses on solving more than one element of the neural network design or is looking to use genetic algorithms to replace a part of the traditional neural network, such as …

How Covid-19 Has Impacted Romantic Relationship Dynamics, Alexandria Jayci Lake

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this study was to provide an exploration of impacts to romantic relationship dynamics attributed the COVID-19 pandemic. Though many attributes of COVID-19 classify it as a distinct, unique event in its own right, a literature review of past global health events and economic crises provided a foundational reference point from which to compare it to. Twelve participants who were in relationships with another person for at least four years at the time were interviewed, six of which who were parented individuals and six of which who had no children, to discover how COVID-19-related changes developed over the …

A Human-Embodied Drone For Dexterous Aerial Manipulation, Dongbin Kim

UNLV Theses, Dissertations, Professional Papers, and Capstones

Current drones perform a wide variety of tasks in surveillance, photography, agriculture, package delivery, etc. However, these tasks are performed passively without the use of human interaction. Aerial manipulation shifts this paradigm and implements drones with robotic arms that allow interaction with the environment rather than simply sensing it. For example, in construction, aerial manipulation in conjunction with human interaction could allow operators to perform several tasks, such as hosing decks, drill into surfaces, and sealing cracks via a drone. This integration with drones will henceforth be known as dexterous aerial manipulation.

Our recent work integrated the worker’s experience into …

Quaternary Ammonium Compounds As Precursors To Disinfection Byproducts, Padmanabhan Krishnaswamy

UNLV Theses, Dissertations, Professional Papers, and Capstones

Disinfection of drinking water is crucial for providing a safe potable water supply. Some of the most common disinfectants employed are chlorine, chloramines and ozone. While these disinfectants successfully inactivate pathogenic microorganisms, they simultaneously react with inorganic or organic precursors to form toxic byproducts, most commonly referred to as disinfection byproducts (DBPs). While there is a wide variety of organic matter and disinfection byproducts known, in this study we have looked into the potential of certain quaternary ammonium compounds (QACs) to act as precursors to form DBPs, namely trihalomethanes (THMs), haloacetonitriles (HANs) and nitrosamines.

The ubiquitous nature of QACs in …

The Influences Of Medicaid On Mental Health Practitioners, Matthew Mohan

UNLV Theses, Dissertations, Professional Papers, and Capstones

Medicaid is the largest publicly funded health insurance program which influences the mental health practitioners’ treatment of low income individuals (Altman & Frist, 2015; Rowland et al., 2003). To understand how Medicaid influences mental health practitioners, this study utilizes institutional theory by using the five propositions from Lammers and Barbour (2006) to analyze how Medicaid’s communicative practices influence mental health practitioners who treat those who are in poverty. Semi-structured interviews were conducted with 10 mental healthcare practitioners who accepted Medicaid: two psychologists, five social workers, one psychiatrist, and two psychiatric nurse practitioners. The results demonstrate how mental health practitioners respond …

Multiple Approaches To Auditory Rhythm: Development Of Sustained Musical Beat And The Relation To Language, Development Of Rhythmic Categories Via Iterated Production, And A Meta-Analytic Study Of Neural Entrainment To Beat, Karli Marie Nave

UNLV Theses, Dissertations, Professional Papers, and Capstones

Rhythm is ubiquitous to human communication, coordination, and experience of music. In this dissertation, I address three empirical questions through three different methodologies, all of which contribute to the growing body of literature on human auditory rhythm processing. In Chapter 2, I present a registered report detailing the results of independent conceptual replications of Nozaradan, Peretz, Missal, & Mouraux (2011), all using the same vetted protocol. Listeners performed the same tasks as in Nozaradan et al. (2011), with the addition of behavioral measures of perception. In neuroscience, neural correlates to musical beat perception have been identified, yet little to no …

Tinyml For Gait Stride Classification, Priyanka Rajendra

UNLV Theses, Dissertations, Professional Papers, and Capstones

Human gait classification and analysis become very important when a person has been diagnosed with a neurological disorder or has suffered an injury which has affected their ability to walk correctly. Gait strides are an important parameter to be studied as it helps the doctor to diagnose any underlying gait condition and evaluate what type of treatment suits the best for the patient’s recovery. Studying gait strides also helps athletes to improve their performance.In today’s world, machine learning has emerged as one of the most widely used technology for classification and analysis of gait characteristics. TinyML is a field of …

Constructing The Perfect Girlfriend: Gender, Class, Race, & Performativity Of Paid Intimacy In Nevada Brothels, Christina Parreira

UNLV Theses, Dissertations, Professional Papers, and Capstones

While most research on commodified intimacy, especially in the sex industry, has explored gender dynamics, sex work researchers are beginning to also explore intersectional dynamics in the industry. But little research has examined whether or how workers may navigate these dynamics differently through the ways in which they understand and perform service labor. Much research has explored commodified intimacy in different settings, but very little attention has been paid to the different ways that workers in the same setting perform intimacy. In this dissertation I ask how do different performances of intimate service in the brothels- the girlfriend experience (GFE) …

Exploring The Latent Space Of Image Captioning Networks, Mikian J. Musser

UNLV Theses, Dissertations, Professional Papers, and Capstones

State-of-the-art image captioning models can successfully produce a diverse set of accurate captions. Previous research has focused on improving caption diversity while maintaining a high level of fidelity. We shift the focus from accuracy and diversity to controllability. We use a modified version of the traditional encoder-decoder network that allows the model to produce a meaningful and structured latent space. We then explore the latent space using several latent cartographic methods: lerp, slerp, analogy completion, attribute vector rotation, and interpolation graphs. Additionally, we discuss different categories of latent space and provide modifications for each of the cartographic methods. Finally, we …

Exploring Treatment Targets To Mitigate Fear Of Falling Activity Avoidance Behavior In Parkinson's Disease And Older Adults, John Vincent Rider

UNLV Theses, Dissertations, Professional Papers, and Capstones

Fear of falling (FOF) is a significant concern among individuals with Parkinson’s disease (PD) and older adults in general. This FOF can lead to avoidance behavior resulting in activity restriction. Some level of fear of falling avoidance behavior (FFAB) may be protective (adaptive) and decrease the likelihood of falls, especially among individuals with physical limitations and high fall risk. However, excessive (maladaptive) avoidance behavior may lead to downstream consequences such as further physical and psychological decline and an increased likelihood of falls, especially when there is a disparity between the FFAB and physiological fall risk. While poor physical functioning, disease …

Computational Sodium Heat Pipe Simulation In Three Dimensions For Transient Nuclear Reactor Analysis With Variable Surface Heat Flux, Valerie Jean Lawdensky

UNLV Theses, Dissertations, Professional Papers, and Capstones

Heat pipes are used to transfer heat through phase change in a liquid/vapor contained in a metal tube. They are passive devices that require no pumps to circulate the fluid and can transfer heat far more efficiently than a solid copper rod of the same diameter. They are commonly used in laptop computers where copper heat pipes filled with water take heat away from the CPU and transfer the heat to air through a heat exchanger. Heat pipes were also used in the Kilopower nuclear reactor where higher temperatures required sodium as the working fluid with stainless steel tubes. Computer …

Modeling The Mechanical Behavior And Shock Propagation Of Metallic And Nanocomposite Materials, Pouya Shojaeishahmirzadi

UNLV Theses, Dissertations, Professional Papers, and Capstones

Evaluating the materials properties under different loading conditions is critical in various industries. Compared to quasi-static loading, predicting the behavior of structures under dynamic loads is more challenging. In this work, we will address multiple problems with strain rates varying from quasi-static to hypervelocity conditions. Computer simulation is increasingly used in the design and evaluation phases to improve the efficiency, cost-effectiveness, and flexibility. However, verification and validation of each simulation is necessary. Experiments are performed in all topics and the computational models are validated by comparing with the experiments. One of the most common types of connections in structures is …

Ab-Initio And Empirical Simulations Of Aluminum And Copper Metal, William Wolfs

UNLV Theses, Dissertations, Professional Papers, and Capstones

In this work, I perform detailed calculations on the bulk and electronic properties of aluminum and copper metal. Originally, I was motivated by experimental work on the solidsolid phase changes in pure aluminum. These phase changes were well predicted by density functional theory(DFT) but difficult or impossible to predict using embedded atom method potentials(EAM). EAM potentials are in wide use to describe many properties of bulk materials, and it seemed worrying that something so basic as a phase change could not be predicted. I began running high precision calculations with DFT and compared the results to EAM potentials which had …

Feasibility And Efficacy Of Virtual Darkness In Reducing Intra-Individual Sleep Variability Among Young Adults With Insomnia, Samantha Nicole Sherwood

UNLV Theses, Dissertations, Professional Papers, and Capstones

BackgroundInsomnia impacts 30% of people and is associated with increased risk for medical and psychiatric illness. However, pharmacological treatments for sleep yield mixed results and often result in undesirable side effects indicating a need for novel insomnia interventions. Sleep patterns also demonstrate high intra-individual variability which may be associated with greater daytime impairment, and sleep-wake cycles are strongly affected by the timing of exposure to blue-green wavelength light. Virtual darkness, a novel intervention, blocks blue wavelength light from reaching the eye to simulate actual darkness on retinal cells sensitive to light. Therefore, the purpose of the current study is to …

Machine Learning Analysis Of Single Nucleotide Polymorphism (Snp) Data To Predict Bone Mineral Density In African American Women, Erick Githua Wakayu

UNLV Theses, Dissertations, Professional Papers, and Capstones

Osteoporosis is a debilitating disease in which an individual’s bones weaken, making bones fragile and more susceptible to fracture. While commonly found amongst postmenopausal Caucasian and Asian women based on previous studies, those of African descent (African American/Black) have largely been ignored when it comes to osteoporotic studies, especially when it comes to Genome Wide Association Studies (GWAS). From GWA studies, we gain access to single nucleotide poly-morphisms (SNPs) that may contribute to certain illnesses, such as osteoporosis. With low Bone Mineral Density (BMD) being one of the primary markers of potential osteoporosis, it is prudent that proper research is …