Digital Commons Network^™

Operating Solar Projects In Nevada, 2021, Kristian Thymianos, Saha Salahi, William E. Brown Jr.

Environment

The U.S. Energy Information Administration (EIA) and the Solar Energy Industries Association (SEIA) both provide national databases that contain comprehensive lists of active solar projects in the United States. This fact sheet provides a list of operating solar projects in the State of Nevada.

The “East Side” Of Las Vegas: A Latinx Historical Framework, Nathalie Martinez

Spectra Undergraduate Research Journal

Spanish heritage speakers in the United States are a reflection of everchanging linguistic and sociolinguistic pressures that result in myriad varieties across generations. This paper provides a preliminary historical framework to fill this gap of linguistic knowledge in the Spanish-speaking community of Las Vegas, Nevada. The goals were two-fold: (1) highlight the largest Spanish-speaking communities in Las Vegas and (2) explore the significance of the East Side in the history of the Latinx population of Las Vegas. Through the analysis of oral histories and historical works, the investigation highlights the Mexican, Salvadoran, and Cuban populations of Las Vegas and their …

Qualitative Review Of Educational Interventions For Improving Physical Activity Behaviors In Older Asian Americans In The United States, Raisa Kabir, Manoj Sharma, Sayeda Tazim Zaidi, Chia-Liang Dai

Spectra Undergraduate Research Journal

Physical activity (PA) provides numerous health benefits and minimizes chronic diseases and mental health issues, especially in older adults. The national survey data indicated that only 27.3% to 44.3% of older adults meet the recommended PA guidelines of 150 to 300 minutes/ week. There is limited data on PA behavior among older Asian American (AA) adults as very few to no local/national surveys have targeted these marginalized subgroups. This comprehensive review aims to identify existing PA intervention strategies and to update current knowledge on the effectiveness of these interventions to improve PA behavior among aging AA in the US. The …

The Future Of The Live Entertainment Tax In Southern Nevada, Katie M. Gilbertson

Spectra Undergraduate Research Journal

The Live Entertainment Tax (LET) in Nevada generated nearly one billion dollars during the 2019-2020 fiscal year. LET revenue all goes to the State General Fund, even though 97 percent of LET revenue is generated in Clark County. Nevada is experiencing an economic crisis, particularly in the tourism industry. Solutions from various fields suggest the best way to boost the local economy is to reinvest revenue in its original county. One policy solution Nevada policymakers should consider is to carve out a percentage of revenue generated by the LET to return directly back to Clark County to revitalize tourism.

Diabetes Mellitus Affects Working Memory, Dylone C. Braganza, Emmanuel Flores, Lauren A. Crew, Ryan A. Wirt, Andrew A. Ortiz, Adam M. Mcneela, Jefferson W. Kinney, James M. Hyman

Spectra Undergraduate Research Journal

Alzheimer’s disease (AD) degrades the brain’s ability to remember, think, and carry out tasks. The exact cause is not known, but several risk factors have been identified, including diabetes mellitus (DM). DM causes elevated blood sugar levels due to reduced insulin production in the pancreas. The linkage between elevated glucose levels and the behavioral impairments are not fully understood, which was the focus of this study. Rats were trained to alternate directions in a maze to receive a reward on consecutive trials. After training, five rats were injected with streptozotocin (STZ), which induces hyperglycemia by injuring pancreatic beta cells. Three …

A Timeline Of Discovery And Current Research On Primary Open-Angle Glaucoma And Emergence Of Potentially Permanent Treatment Solutions, Yonosuke Dejesus, Guadalupe Moreno Ceballos

Spectra Undergraduate Research Journal

This research examines the timeline of the discovery and research of Primary Open-Angle Glaucoma (POAG). By reviewing the literature on genetic and molecular mechanisms, we aim to emphasize a long-term treatment solution (iSTENT) to mitigate intraocular pressure (IOP) related to POAG etiology and disease progression. POAG is a multifactorial, autosomal dominant, adult-onset eye disease wherein the optic nerve cells become damaged due to a buildup of excess aqueous humor, resulting in increased IOP. Consequently, POAG leads to progressive loss of peripheral vision and is the leading cause of blindness in the US. Due to the multifactorial nature of glaucoma’s inheritance …

Racial Profiling: Understanding The Practice Of Stop-And-Frisk In New York City, Lisa Ly

Spectra Undergraduate Research Journal

Racial profiling has become a prominent issue in modern policing today. Instead of being based on individual suspicion, racial profiling embodies a belief that people of color are continuously singled out by the police for scrutiny and harassment. Policies and procedures make the Black community vulnerable to police discrimination and racial profiling. Floyd et al. v. City of New York et al. (2013) declared that the New York Police Department’s (NYPD) practice of stop-and-frisk was racially profiling Black civilians. This study sought (1) to determine if the NYPD post-Floyd is still engaging in racial profiling towards Black civilians; and (2) …

Free-Free Absorption In Hot Relativistic Flows: Application To Fast Radio Bursts, Esha Kundu, Bing Zhang

Physics & Astronomy Faculty Research

Magnetic flares create hot relativistic shocks outside the light cylinder radius of a magnetized star. Radio emission produced in such a shock or at a radius smaller than the shock undergoes free–free absorption while passing through the shocked medium. In this work, we demonstrate that this free–free absorption can lead to a negative drift in the frequency-time spectra. Whether it is related to the downward drift pattern observed in fast radio bursts (FRBs) is unclear. However, if the FRB down-drifting is due to this mechanism then it will be pronounced in those shocks that have isotropic kinetic energies ≳1044 erg. …

A Proposed Change To Astronaut Exposures Limits Is A Giant Leap Backwards For Radiation Protection, Francis A. Cucinotta, Walter Schimmerling, Eleanor A. Blakely, Tom K. Hei

Health Physics and Diagnostic Sciences Faculty Research

Addressing the uncertainties in assessing health risks from cosmic ray heavy ions is a major scientific challenge recognized by many previous reports by the National Academy of Sciences (NAS) and the National Council on Radiation Protection and Measurements (NCRP) advising the National Aeronautics and Space Administration (NASA). These reports suggested a series of steps to pursue the scientific basis for space radiation protection, including the implementation of age and sex dependent risk assessments and exposure limits appropriate for a small population of radiation workers, the evaluation of uncertainties in risk projections, and developing a vigorous research program in heavy ion …

Environmental Rhetoric And An Ecology Of Transcendence: A Rhetorical Criticism Of Awake, A Dream From Standing Rock, Alyssa Kahn

UNLV Theses, Dissertations, Professional Papers, and Capstones

My project blends Burkean theory with Indigenous rhetoric to argue that the counter- story of Awake proposes an ecology of transcendence to make sense of human-nature relationships. I wanted to analyze Awake A Dream From Standing Rock. The documentary is explicitly about Indigenous peoples. This documentary tells the story of the peaceful protests and resistance led by Native people at the Standing Rock Sioux Reservation or Lakota Tribe in North Dakota. The activists were protecting the water otherwise known as water protectors/warriors from the construction of the Dakota Access Pipeline (DAPL). The assembly of DAPL is intended to carry perforated …

Tail-Measurable Functions And Their Corresponding Induced Classes, And Some Determinacy Conditions Involving 3-Player Games, Joshua K. Reagan

UNLV Theses, Dissertations, Professional Papers, and Capstones

In this dissertation, we have two main categories of results. The first is regarding certain point-classes, and the second is regarding 3-player games.

The point-classes of Baire Space, \mathcal{N}, in the Borel and Projective Hierarchies, as well as Hausdorff's Difference Hierarchy have been well studied, and there has been much research into further stratifying these hierarchies. One area of particular interest falls in between the point-classes \mathbf{\Pi}_\mathbf{1}^\mathbf{1} and \Delta\left(\omega^2-\mathbf{\Pi}_\mathbf{1}^\mathbf{1}\right). It is well known that the point-classes \beta-\mathbf{\Pi}_\mathbf{1}^\mathbf{1}, for \beta\in\omega^2, stratify this region of the projective hierarchy, with the point-class \bigcup_{\beta\in\omega^2}\beta-\mathbf{\Pi}_\mathbf{1}^\mathbf{1} still falling strictly below \Delta\left(\omega^2-\mathbf{\Pi}_\mathbf{1}^\mathbf{1}\right). Dr. Derrick DuBose developed multiple …

Forecasting Pedestrian Trajectory Using Deep Learning, Arsal Syed

UNLV Theses, Dissertations, Professional Papers, and Capstones

In this dissertation we develop different methods for forecasting pedestrian trajectories. Complete understanding of pedestrian motion is essential for autonomous agents and social robots to make realistic and safe decisions. Current trajectory prediction methods rely on incorporating historic motion, scene features and social interaction to model pedestrian behaviors. Our focus is to accurately understand scene semantics to better forecast trajectories. In order to do so, we leverage semantic segmentation to encode static scene features such as walkable paths, entry/exits, static obstacles etc. We further evaluate the effectiveness of using semantic maps on different datasets and compare its performance with already …

Understanding And Addressing Preservice Elementary Teachers’ Misconceptions In Science Education, Nicole Juliana Thomas

UNLV Theses, Dissertations, Professional Papers, and Capstones

Prior research has demonstrated that both children and adults alike hold misconceptions about various scientific phenomena (Snyder & Sullivan, 1995; Driver et al., 1985). These misconceptions range from a variety of different fields, including astronomy and space science, environmental biology, and geology, among others (Miller & Brewer, 2010; Wandersee et al., 1994; Ritger & Cummins, 1991). Research suggests that the vast majority of misconceptions are formed early in a students’ educational career, and these misconceptions could be held throughout adulthood unless they are sufficiently addressed (Coley & Tanner, 2012; Posner et al., 1982; Nehm & Reilly, 2007; Sadler et al., …

The Development Of Prerequisite Skills And Concepts From Task-Based Interviews In Calculus Students With Low-Levels Of Prerequisite Skills, Nicholas Wong

UNLV Theses, Dissertations, Professional Papers, and Capstones

This task-based interview study examined the development of prerequisite skills and concepts and calculus skill and concepts of students who entered a first-semester calculus course with a low level of prerequisite skills. The participants in this study completed three task-based interviews with two tasks in each interview. The research question addressed by this study was, To what extent do task-based interviews reveal students’ prerequisite skills and conceptual understanding for applications of the derivative and how do these skills and understanding develop for students who have been classified as having low levels of prerequisite skills upon entering a calculus course? The …

Analysis Of Microscopic Objects Using Computer Vision Methods, Yuan Dao

UNLV Theses, Dissertations, Professional Papers, and Capstones

As an essential and powerful tool to observe living organisms, three-dimensional fluorescence microscopy is widely used in biological research and diagnosis. The 4D fluorescence microscopy data can be obtained using time-lapsed videos of 3D images. To analyze and extract useful information from the increasingly large and complex biological image dataset, efficient and effective computational tools are in need but still lagging behind. In analyzing biological data, two major challenges are faced. First, time-lapsed fluorescence microscopic images typically have a low SNR. Second, biological objects often change their morphology and internal structure frequently. As such, conventional image processing methods may not …

Hyperpolarizability Dispersion Measured For Carbon Disulfide Vapor, Rodrigo N. Fernandez

UNLV Theses, Dissertations, Professional Papers, and Capstones

The second hyperpolarizability (γ) of carbon disulfide (CS2) was measured by gas phase electric-field-induced second harmonic generation (ESHG), for laser wavelengths in the range of 765-1064 nm. The observed hyperpolarizability is decomposed into electronic (γ^e) and vibrational (γ^v) contributions, and the dispersion curve for γ^eis extrapolated to the static limit, with the result γ^e_0 = 12558 ± 93 atomic units. The results of this experiment agree with other recent nonlinear optical measurements and theoretical calculations.

Turning Up The Sound! Senior-Level Sonographers' Perspectives On The Workforce Readiness/Competency Of Entry-Level Sonographers In The Workplace, Janice L. Glasper

UNLV Theses, Dissertations, Professional Papers, and Capstones

There has been a longstanding preoccupation with the workforce readiness and competency of our nation’s graduates since the release of the National Commission on Excellence in Education’s, April 1983 landmark report, A Nation at Risk: “The Imperative for Educational Reform”, which indicated that the educational foundations of our society were being eroded by a rising tide of mediocrity that threatened our very future as a Nation and a people. Now, more than 35 years since the release of A Nation at Risk, it appears that little has changed. Extensive research continues to report that graduates of post-secondary institutions are unprepared …

Effects Of A Discourse Intervention On End-Of-Life Knowledge And Attitudes Of Bsn Nursing Students, Jayme Gullone Haynes

UNLV Theses, Dissertations, Professional Papers, and Capstones

Introduction. A number of challenges exist to providing effective, formalized end of life (EOL) education for undergraduate nursing students. Despite advanced resources provided by the End-of-Life Nursing Education Consortium (ELNEC), many nursing program curricula are overloaded with content and have little opportunity to incorporate other content and information.

In addition, the topic of EOL care may elicit significant emotional responses from nursing students with numerous studies indicating nursing students experience fear and anxiety when caring for patients at EOL. Recent research demonstrates the need to approach emotionally laden topics such as EOL care from a pedagogical perspective that acknowledges and …

A 155-Year Tree-Ring Based Record Of Warm And Dry Snow Droughts For The Cascade Range, Usa, Laura A. Dye

UNLV Theses, Dissertations, Professional Papers, and Capstones

Contributing 50-80% to the surface water for the region, mountain snowpack is a pillar of the hydrologic cycle in the western US, and is projected to decrease to 44% by 2100 in the Cascade Mountains alone. The western US has recently been identified as a global snow drought hot spot, exhibiting more frequent, intensified, and lengthened snow drought events in recent decades. Only recently has the need to understand the types of snow droughts and their driving mechanisms become critical to understand and quantify. Recent research suggests ‘warm’ snow droughts caused by winter precipitation falling as rain rather than snow …

Functional Π-Organogelators: From Nanoribbons To Organic Phosphors, Sae Hui Lee

UNLV Theses, Dissertations, Professional Papers, and Capstones

π-Conjugated systems have been receiving notable attention in the field of organic material chemistry due to their interesting optical properties, assembling properties, and potential application in optoelectronics. Among various self-assembly methods, organogelation has been known to allow facile and easily reproducible molecular assembly. This work focuses on creating new π-organogelators with various side group modifications which in result allow proper tuning of the optical properties along with an effective self-assembly upon gelation. The research comprises of two chapters: 1) the first chapter focuses on N-heteroacenes (NHAs) with gelation property and 2) the second chapter investigates gelation induced phosphorescence (GIP) of …

Rotten With Prediction, Serena Raquel Hicks

UNLV Theses, Dissertations, Professional Papers, and Capstones

This project focuses on the relationship between religion and technology as it is portrayed in Science Fiction (SF). This thesis explores the SF genre rhetorically by examining the 2002 movie Minority Report (MR), which signaled the importance of surveillance and the need to predict future crimes following 9/11. The events of 9/11 played a significant role in post 9/11 SF films, which reflect and critique our communal and cultural values. 9/11 created a new relationship between the U.S justice system, predictive technologies (PTs), and data gathering. Through the Bush Doctrine of “preemptive action,” the U.S government attempted to use Dataism, …

On-Chip Terahertz Time-Domain Spectroscopy, Randy Sterbentz

UNLV Theses, Dissertations, Professional Papers, and Capstones

Terahertz time-domain spectroscopy (THz-TDS) allows the direct measurement of optical and charge carrier properties of materials in a region of the electromagnetic spectrum inaccessible to most other spectroscopic techniques. We have adapted the technique to an on-chip arrangement that allows us to measure these properties in nanoscale materials with dimensions below the diffraction limit. In this thesis, we present the operation of instruments and the mechanics behind performing on-chip terahertz time-domain spectroscopy. Three materials were tested to confirm the capabilities of our system to measure THz radiation: indium selenide (InSe), radiation-damaged silicon-on-sapphire (RD-SOS), and an erbium arsenide:gallium arsenide superlattice. Preliminary …

Cultivating Graduate Stem Pathways: How Alliance-Based Stem Enrichment Programs Broker Opportunity For Students Of Color, Ariana L. Garcia, Tonisha B. Lane, Blanca E. Rincón

Educational Psychology, Leadership, and Higher Education Faculty Research

To understand how higher education institutions broker graduate opportunities for Students of Color (SOCs) in STEM, we employ a single case study of a Louis Stokes Alliance for Minority Participation (LSAMP) alliance. Drawing primarily from student interviews and informed by Small’s (2006) organizational brokerage theory, our findings illuminate how 1) alliance-based STEM enrichment programs (SEPs) bridge social capital via interorganizational networks and 2) how SEP instability creates barriers to building the trust that is central to the brokerage process. We conclude with recommendations for future research and practice.

Localization Of Native Mms13 To The Magnetosome Chain Of Magnetospirillum Magneticum Amb-1 Using Immunogold Electron Microscopy, Immunofluorescence Microscopy And Biochemical Analysis, Zachery Oestreicher, Carmen Valverde-Tercedor, Eric Mumper, Lumarie Pérez-Guzmán, Nadia N. Casillas-Ituarte, Concepcion Jimenez-Lopez, Dennis A. Bazylinski, Steven K. Lower, Brian H. Lower

Life Sciences Faculty Research

Magnetotactic bacteria (MTB) biomineralize intracellular magnetite (Fe3O4 ) crystals surrounded by a magnetosome membrane (MM). The MM contains membrane-specific proteins that control Fe3O4 mineralization in MTB. Previous studies have demonstrated that Mms13 is a critical protein within the MM. Mms13 can be isolated from the MM fraction of Magnetospirillum magneticum AMB-1 and a Mms13 homolog, MamC, has been shown to control the size and shape of magnetite nanocrystals synthesized in-vitro. The objective of this study was to use several independent methods to definitively determine the localization of native Mms13 in M. magneticum AMB-1. Using Mms13-immunogold labeling and transmission electron microscopy …

Joint Displays For Mixed Methods Research In Psychology, Matthew T. Mccrudden, Gwen Marchand, Paul A. Schutz

Research & Economic Development Faculty Research

Mixed methods researchers use joint displays for integration at different phases of the research process in psychological research. Joint displays are visual displays that are used to integrate quantitative and qualitative data during data collection, analysis, and interpretation. We discuss different mixing purposes and how joint displays may help researchers integrate the quantitative and qualitative strands of a study. We provide examples of joint displays for data collection and for data analysis, including newer innovations. Finally, we discuss considerations, including benefits and challenges, of using joint displays during data collection and analysis.

An Exploratory Assessment Of Callings: The Importance Of Specialization, Christopher Paul Cain, Lisa Nicole Cain, James A. Busser, Hee Jung Kang

Hospitality Faculty Research

Purpose This study sought to understand how having a calling influenced engagement, work–life balance and career satisfaction for Professional Golfers Association of America (PGA) and Golf Course Superintendent of America (GCSA) professionals. Design/methodology/approach A conceptual model was used to examine callings among golf course supervisors and its impact on their engagement, work–life balance and career satisfaction. This study also explored the moderation effect of employees’ generalized or specialized role on the calling–engagement relationship. Surveys were collected from a single golf management company and partial least squares structural equation modeling (PLS-SEM) was used for data analysis. Findings The results revealed significant …

A Mechanical Model For Magnetized Relativistic Blastwaves, Shunke Ai, Bing Zhang

Physics & Astronomy Faculty Research

The evolution of a relativistic blastwave is usually delineated under the assumption of pressure balance between forward- and reverse-shocked regions. However, such a treatment usually violates the energy conservation law, and is inconsistent with existing magnetohydrodynamic numerical simulation results. A mechanical model of non-magnetized blastwaves was proposed in previous work to solve the problem. In this paper, we generalize the mechanical model to the case of a blastwave driven by an ejecta with an arbitrary magnetization parameter $\sigma_{\rm ej}$. We test our modified mechanical model by considering a long-lasting magnetized ejecta and found that it is much better than the …

Evaluating Irrigation Performance And Water Productivity Using Eeflux Et And Ndvi, Usha Poudel, Haroon Stephen, Sajjad Ahmad

Civil and Environmental Engineering and Construction Faculty Research

Southern California’s Imperial Valley (IV) faces serious water management concerns due to its semi-arid environment, water-intensive crops and limited water supply. Accurate and reliable irrigation system performance and water productivity information is required in order to assess and improve the current water management strategies. This study evaluates the spatially distributed irrigation equity, adequacy and crop water productivity (CWP) for two water-intensive crops, alfalfa and sugar beet, using remotely sensed data and a geographical information system for the 2018/2019 crop growing season. The actual crop evapotranspiration (ETa) was mapped in Google Earth Engine Evapotranspiration Flux, using the linear interpolation method in …

Pathcnn: Interpretable Convolutional Neural Networks For Survival Prediction And Pathway Analysis Applied To Glioblastoma, Jung Hun Oh, Wookjin Choi, Euiseong Ko, Mingon Kang, Allen Tannenbaum, Joseph O. Deasy

Computer Science Faculty Research

Motivation: Convolutional neural networks (CNNs) have achieved great success in the areas of image processing and computer vision, handling grid-structured inputs and efficiently capturing local dependencies through multiple levels of abstraction. However, a lack of interpretability remains a key barrier to the adoption of deep neural networks, particularly in predictive modeling of disease outcomes. Moreover, because biological array data are generally represented in a non-grid structured format, CNNs cannot be applied directly. Results: To address these issues, we propose a novel method, called PathCNN, that constructs an interpretable CNN model on integrated multi-omics data using a newly defined pathway image. …

Improving K-12 Education For Hispanic Students In Las Vegas And Beyond, Richard Reeves, Ember Smith

Policy Briefs and Reports

Public K-12 education serves as a launching pad for economic mobility and opportunity, preparing students for college or a good-paying job. Despite K-12 education’s influence on later-in-life outcomes, schools often underserve students of color. Hispanic students in particular constitute a significant and growing portion of the U.S. student population yet are often overlooked in education literature because they are not the lowest performing demographic. In this brief, we examine how well public K-12 education serves Hispanic students in Clark County, where nearly half of students are Hispanic. We then consider factors that may influence student performance, including both in-school factors …