Digital Commons Network^™

Numerical Study Of Oxidation In Stainless Steel Alloy Ep-823 By Liquid Lead-Bismuth Eutectic, Rajyalakshmi Palaparty

UNLV Theses, Dissertations, Professional Papers, and Capstones

The oxidation of stainless steel is influenced by the presence of oxygen in the surrounding medium; the oxygen reacts with the alloy to form an oxide. In certain environments, such as nuclear reactor coolant systems, minimal oxidation of the stainless steel containment functions as a protective shield from corrosive coolants such as liquid lead-bismuth eutectic.

In the current study, this minimal oxidation is evaluated for a system in which corrosion-resistant stainless steel alloy EP-823 is subject to an environment of flowing oxygenated liquid lead-bismuth eutectic at a temperature of 743 K, whereby the thickness of the forming oxide layer is …

Educating Perinatal Nurses To Promote Bonding Techniques And Increase Support Of Neonatal Intensive Care Unit Parents, Kandice Perez

UNLV Theses, Dissertations, Professional Papers, and Capstones

NICU treatment team members and perinatal nurses must strive to educate parents and promote parent/infant bonding; failure to do so can result in poor emotional well-being of the parent. Supportive behaviors of nursing staff, and the promotion of bonding techniques inside and outside of the NICU setting can provide aid to parents throughout their NICU journey. However, perinatal nurses are often not provided the necessary knowledge and skills to promote parental bonding, emotional support, empowerment, and education to parents whose infants are unexpectedly admitted to the NICU. Purpose: The purpose of this DNP project was to increase perinatal nurses’ knowledge …

Evaluation Of A Continuous Air Monitoring System On An Unmanned Aerial Vehicle For Measurement Of Airborne Radioactive Material, Adam Pfannenstein

UNLV Theses, Dissertations, Professional Papers, and Capstones

The release of airborne radioactive material presents a health risk hazard to many individuals, emergency responders and public. It is necessary to characterize the unknown radioactive dangers produced in the event of these incidents. Advantages to utilizing unmanned aerial systems in this effort are personnel risk reduction and quick attainment of data points in a plume. By pairing a continuous air monitor and detector with a drone, radioactive material concentration can be quantified, and thus the extent of potential doses can be estimated. A small, low-flow air sampler with a Geiger-Mueller counter was characterized using measurements of sources representing a …

Miocene-Quaternary Deformation Along The Central Maynard Lake Fault, Pahranagat Shear Zone, Nevada, Alexander Peck

UNLV Theses, Dissertations, Professional Papers, and Capstones

The left-lateral Pahranagat shear zone (PSZ) and Caliente-Enterprise zone (CEZ) exist at the boundary between two sub-provinces, the Northern (NBR) and Central Basin and Range (CBR). The PSZ contains three major ENE striking sinistral faults, including the Maynard Lake fault (MLF), which is the longest fault and marks the southern boundary of the zone. The PSZ has been suggested to be a transfer zone, but little is known about the structures along these major faults that are involved in strain transfer. These left-lateral systems exist within the Central Nevada seismic belt which has experienced significant earthquakes in recent history. Possible …

Machine Learning Applications In Graduation Prediction At The University Of Nevada, Las Vegas, Elliott Collin Ploutz

UNLV Theses, Dissertations, Professional Papers, and Capstones

Graduation rates of four-year institutions are an increasingly important metric to incoming students and for ranking universities. To increase completion rates, universities must analyze available student data to understand trends and factors leading to graduation. Using predictive modeling, incoming students can be assessed as to their likelihood of completing a degree. If students are predicted to be most likely to drop out, interventions can be enacted to increase retention and completion rates.

At the University of Nevada, Las Vegas (UNLV), four-year graduation rates are 15% and six-year graduation rates are 39%. To improve these rates, we have gathered seven years …

Do I Enact What I Learn?: Examining Novice Science Teachers Approximations Of Practice, Helene Pollins

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this study was to examine novice secondary science teachers’ enactment of their teaching philosophies in their lesson planning and teaching. The framework was based on three theories: approximations of practice, teachers’ knowledge of content and students (KCS), and experiential learning. The design for this research used a qualitative case study design. The participants were three novice science teachers in a large school district in the Southwestern United States. Data sources included teaching philosophies, three semi-structured interviews, lesson plans, and observations. Three research questions were: what are novice science teachers’ major philosophies at the entry level of teaching; …

A Numerical Model Of An Axial Wind Turbine, Andrew Liam Poland

UNLV Theses, Dissertations, Professional Papers, and Capstones

Since the beginning of the industrial revolution, there has never been more of a constant in the world than that of the demand for energy. For years a stable source has been fossil fuels, but with the growing impacts of global warming, it is important to look for renewable sources. Wind energy’s use has become more and more prevalent throughout the world.

This preliminary work runs through the creation of a three-dimensional numerical model of a conventional wind turbine that was created using ANSYS-Fluent© commercial software. This work provides the base wind turbine and a blade element and momentum theory …

A Machine Learning Approach To Predict First-Year Student Retention Rates At University Of Nevada, Las Vegas, Aditya Rajuladevi

UNLV Theses, Dissertations, Professional Papers, and Capstones

First-year student retention rates for a four-year institution refers to the percentage of First-time Full-time students from the previous fall who return to the same institution for the following fall. First-year retention rates act as an important indicator of the student satisfaction as well as the performance of the university. Moreover, universities with low retention rates may face a decline in the admissions of talented students with a notable loss of tuition fees and contributions from alumni. Therefore, it is important for universities to formulate strategies to identify students who are at risk of not being retained and take necessary …

Beyond The Melting Pot: An Anthology Of Modern Art Song By Immigrant Composers In America, Kathryn Omune

UNLV Theses, Dissertations, Professional Papers, and Capstones

The anthologies currently available of modern American art song present a homogenous

view of the composers working today in this country. As a whole, they do little to

acknowledge the diverse group of musicians actively composing in this genre. As a

country filled with an array of talented and multi-cultural musicians, it is essential that

the vocal repertory accurately represents both the composers and the performers working

within the field.

The purpose of this document and anthology is to fill a void left by the current

published anthologies by presenting art song composed by immigrant composers. Geared

towards teachers and …

A Novel Approach To Analyzing Strain Heterogeneity In Polycrystalline Quartz Specimens Deformed At High Pressure And Temperature, Nolan Ambrose Regis

UNLV Theses, Dissertations, Professional Papers, and Capstones

Rheological studies of rocks and minerals allow researchers to study the grain-scale deformation mechanisms that govern large-scale geologic processes from mountain building to mantle mixing. Deforming rock samples with high pressure and temperature apparatuses similar to the Griggs piston cylinder apparatus allows us to simulate deformation at depth. However, many apparatuses are limited to “cook-and-look” analysis and require modeling techniques to determine the evolution of deformation patterns found in experimental samples. A previous study used two-dimensional finite element models to analyze the development of stress and strain patterns in polycrystalline rocks. The study suggested rhythmic patterns in deformed rocks develop …

Primordial Black Holes In The Cosmological Context And Transient Electromagnetic Signatures From Merging Black Hole Binaries, Jared Robert Rice

UNLV Theses, Dissertations, Professional Papers, and Capstones

The cosmological evolution of primordial black holes (PBHs) is presented via analysis of the accretion and evaporation histories of the holes. The ultimate end of any BH is evaporation — a spectacular seconds-long burst of high-energy radiation and particles. The critical initial mass of a PBH undergoing current era evaporation is ∼ 510 trillion grams. A near- critical mass PBH will not accrete radiation or matter in sufficient quantity to retard its inevitable evaporation, if the hole remains within an average volume of the universe. The gravitational waves (GWs) from five BH binary merger events discovered by the LIGO/Virgo collaborations …

Use Of Sodium Bismuthate Chromatography For Separation Of Americium From Curium And Other Elements In Spent Nuclear Fuel, Jason Michael Richards

UNLV Theses, Dissertations, Professional Papers, and Capstones

A novel method for partitioning americium from curium has been developed using sodium bismuthate as both an oxidant and a separation medium. The presence of americium and curium in nuclear waste increases the heat load in geological repositories and leads to larger waste volumes. These elements are also the source of most of the long-term radiotoxicity of the waste. However, the heat load and long-term radiotoxicity contribution from americium is much greater than that from curium. The contribution of curium to the heat load and radiotoxicity of the waste is significant on the same time scale as longer-lived fission products …

Prostate Cancer Survival Among Hispanics: A Surveillance, Epidemiology, And End Results (Seer) Population-Based Cohort Study, David Rivas

UNLV Theses, Dissertations, Professional Papers, and Capstones

Hispanics are now the youngest, largest, and fastest growing minority group in the U.S. Prostate cancer (PC) is the most commonly diagnosed cancer in men and is the second-leading cause of cancer deaths among Hispanics. For the first time, we examined PC-specific survival among distinct Hispanic groups that include Mexicans, Cubans, Dominicans, Puerto Ricans, as well as Central and South Americans. We compared these groups to the main reference population in the U.S., non-Hispanic Whites (NHW), after adjustment for prognostic factor risk categories (prostate-specific antigen (PSA) level, Gleason score, and tumor stage), as well as sociodemographic covariates (e.g., health insurance, …

The Importance Of Cultural Competence: The Defining Characteristic Separating Veteran Treatment Courts From Other Specialized Dockets, Kyle Nathan Rodgers

UNLV Theses, Dissertations, Professional Papers, and Capstones

The current study provides a systematic review of veteran treatment court research with two main purposes in mind. The first is to establish whether and how the courts adhere to current evidence-based best practices, and if such practices differ from other specialty court programs. The second is to establish whether and how the concepts of “moral injury” and “posttraumatic growth” are incorporated in current veteran treatment court research and court practices, as an indicator of the cultural competency of both researchers and practitioners. This is a groundbreaking study that expands current research on moral injury and posttraumatic growth from the …

Solvent Extraction And Extraction Chromatography Of Homologs And Pseudohomologs Of Rutherfordium Using Teha And Tehp, Jeffrey Rolfes

UNLV Theses, Dissertations, Professional Papers, and Capstones

Studies of the chemical properties of the heaviest elements have always been difficult due to the short half-lives and low cross sections involved. To solve this problem, atom-at-a-time methods are necessary to determine the properties of these short-lived isotopes. Extremely fast kinetics for the chemical reactions studied (on the same order as the nuclide’s half-life) are required, and the system should have the potential for automation. Solvent extraction, with its selectivity and quick kinetics, has historically been used for these investigations into characteristics of super heavy elements. Another technique, extraction chromatography, offers potentially a way of investigating rutherfordium’s properties, without …

Envisioning Shadows In Romantic Ekphrasis And Early Photography, Joseph Kevin Tuvera Sebastian

UNLV Theses, Dissertations, Professional Papers, and Capstones

This thesis seeks to investigate ekphrasis as a mode of description and as a rhetorical strategy that produces literary affect. In particular, it considers the Romantic poet John Keats’s ekphrastic works to argue that he employs visual strategies of obscurity, which are rooted in

Edmund Burke’s concept of the Sublime, in order to register the formation of Poetic Consciousness. These visual strategies are observed in literal obscurity, which is expressed in shadows as a poetic conceit; they are also demonstrated in what this thesis terms notional or poetic obscurity, which involves mental abstractions that engage the imagination by challenging it …

Applications Of Nanoporous Materials In Gas Separation And Storage, Amit Sharma

UNLV Theses, Dissertations, Professional Papers, and Capstones

Past decades in the field of gas separation and storage utilized the concepts of both cryogenic distillation and non-cryogenic methods such as high-pressure cylinders but few concerns – efficiency, energy intensiveness, cost associated, risk of failure always existed. Recent advances in the field focuses on using porous materials especially nanoporous materials. Nanoporous materials, due to their well-defined structure, range of pore diameters, and striking surface chemistry hold over traditional porous materials for gas separation and storage. With pore diameter less than 2 nm and abundance of energetically favorable sites (such as unsaturated metal sites, channels, cages, cavities etc.), these materials …

Beyond All Of This, Jack Stilwell

UNLV Theses, Dissertations, Professional Papers, and Capstones

This collection of short stories constitutes the strongest work I’ve completed during

my time as a student at UNLV, as well as the work that best represents who I am as a

writer. These stories have undergone fastidious revisions—several over the course of two

or more years—and have at once adhered to a conceptual ideal I’ve had for the collection as

a whole, as well as ventured into surprising territories that changed my under standing of

the collection. Over the course of writing these stories, the breadth of my writing, not

limited to but including the aspects of style, emotional …

Prevalence Of Cariogenic Microbial Flora Among Scardovia Wiggsiae-Positive And Negative Patients, Amy Tam

UNLV Theses, Dissertations, Professional Papers, and Capstones

The formation of dental caries (cavities) is a complex, multi-dimensional process that necessarily involves many risk factors – including the acquisition and colonization of cariogenic oral bacteria. The most frequently associated oral pathogens are the acid-producing and acid-tolerant oral streptococcus species, such as Streptococcus mutans (S. mutans or SM). Many studies have established and confirmed the critical role of the formation of biofilm in the virulence of S. mutans, and the critical role this may play in determining the balance of the oral microbiome towards health or disease.

More recent efforts have discovered a novel cariogenic pathogen, Scardovia wiggsiae (S. …

Beyond The Bench And The Bedside: Examining Women’S Success In Stem Via Active Learning Projects, Sarah E. Thoman

UNLV Theses, Dissertations, Professional Papers, and Capstones

Gender inequality is a persistent challenge in fields related to science, engineering, technology, and math (STEM) in the U.S. The current study aims to advance the literature in a burgeoning area of inquiry by identifying factors that may help to account for women’s success in STEM. To evaluate STEM success, I used a mixed methods design to investigate STEM identity, career identity status, career commitment, and both individual and situational resilience among women undergraduates. Students were engaged in two project-based STEM programs organized at a large, diverse, research intensive university in the Southwest U.S. Associations between resilience and career commitment, …

Electron Monte Carlo Dose Calculation Model Dependency On Optional Applicator Specific 1d Profiles, Ryan Sharp

UNLV Theses, Dissertations, Professional Papers, and Capstones

The accuracy of a calculated dose distribution compared to the actual dose administered to a patient undergoing electron radiation treatment is dependent upon the configured electron dose calculation algorithm in the treatment planning system (TPS). Configuration of the electron Monte Carlo (eMC) algorithm in the Eclipse TPS requires a variety of beam scan data. One of the required data sets is the inclusion of optional in air crossplane (CP) and inplane (IP) profiles. It is unknown if the inclusion of the optional profiles into the eMC algorithm greatly influences the output of the TPS. Two eMC algorithms were configured in …

An Examination Of The Community And Environmental Impact Of A Las Vegas Convention Food Rescue Program, Samantha H. To

UNLV Theses, Dissertations, Professional Papers, and Capstones

Food insecurity affects millions of Americans each year, inflicting negative consequences on the physical and mental health outcomes at all ages. Concurrently, millions of tons of leftover edible foods are sent to landfill each year. Not only does this pose a question of ethics, but increasingly harms the environment by misusing resources and increasing the release of

greenhouse gases.

Food rescue advisory meetings highlighted the need for more focused research to be conducted that assessed the impacts of donating rescued convention food on local environmental and community health. A mixed-method approach was used to detail the food rescue process between …

The Caspase Cascade During Hibernation In The Golden-Mantled Ground Squirrel, Spermophilus Lateralis, Michael David Treat

UNLV Theses, Dissertations, Professional Papers, and Capstones

In several human pathologies like heart attack, stroke, neurodegenerative diseases, and autoimmune disorders, widespread cell death, or apoptosis, is a major cause of organ dysfunction and death. Hibernating golden-mantled ground squirrels, Spermophilus lateralis, experience numerous conditions during the winter that are known to be pro-apoptotic in other mammal systems (e.g. extreme hypothermia, ischemia and reperfusion, acidosis, increased reactive oxygen species, bone and muscle disuse). However, studies suggest that hibernators may invoke a protective phenotype to limit widespread cell damage and loss during the hibernation season. Could regulating apoptosis provide protection against the harmful conditions experienced during the hibernation season? Could …

Notes On Linear Divisible Sequences And Their Construction: A Computational Approach, Sean Trendell

UNLV Theses, Dissertations, Professional Papers, and Capstones

In this Masters thesis, we examine linear divisible sequences. A linear divisible sequence is any sequence {an}n≥0 that can be expressed by a linear homogeneous recursion relation that is also a divisible sequence. A sequence {an}n≥0 is called a divisible sequence if it has the property that if n|m, then an|am. A sequence of numbers {an}n≥0 is called a linear homogeneous recurrence sequence of order m if it can be written in the form

an+m = p1an+m−1 + p2an+m−2 + · · · + pm−1an+1 + pman, n ≥ 0,

for some constants p1, p2, ..., pm with pm = …

Predictors Of Child And Adolescent Bias And Flexibility In The Attractiveness Domain, Stephanie Verba

UNLV Theses, Dissertations, Professional Papers, and Capstones

Children often associate positive attributes with high attractive peers and negative attributes with low attractive peers (bias), although some think both peers have positive attributes and neither has negative attributes (flexibility). Children also believe those they think positively of will think positively of them (positive bias reciprocation/positive flexibility reciprocation) and such beliefs in reciprocation predict bias and flexibility. Given the negative effects of bias (i.e., differential attributions based on one’s attractiveness) and the positive effects of flexibility, this study investigated individual differences in children and adolescent’s attractiveness biases and flexibility. Specifically, the author examined whether 9-11-year-olds and 14-16-year-olds’ beliefs in …

Hearts And Minds: An Analysis Of Checks And Safeguards, Monitoring, And Performance Review Of Executive Boards And Their Executive Directors Within Select Nonprofit Corporations., John Michael Wagner

UNLV Theses, Dissertations, Professional Papers, and Capstones

Horror stories of ineffective nonprofit organization management arise in the media far too often. When these stories emerge, the public demands accountability from those responsible. Ultimately, accountability rests with the fiduciaries of the organization. For nonprofit

organizations in the United States, fiduciary responsibility and accountability reside with the board of directors.

Board governance has been widely studied in the for-profit sector. Due to the critical nature of the work nonprofits perform, there has been an increasing effort to study board governance in nonprofit organizations. Employing in depth interviews, with both executive

directors and board members, checks and safeguards such as …

The New Cambrian Children, Shin Watanabe

UNLV Theses, Dissertations, Professional Papers, and Capstones

This MFA thesis is comprised of my collection of poetry entitled The New Cambrian Children. There are fifty-five pages of poetry in this thesis exploring themes of nature, technology, dystopia, and childhood.

Much of the contemporary writing and discussion surrounding the natural world and its relationship with humanity and technology imagines dystopia. There is a tendency to see the world arising from industrialization, computing technologies, and the World Wide Web as a violation of nature and human spirit. This book does not refute this emotional tenor, nor does it claim knowledge of its conclusion. Instead, it forwards conversations between these …

Levels Of Interleukin-1Β And Interleukin-17 In The Tension And Compression Sites Of Teeth During Orthodontic Movement, Suzanne Wen

UNLV Theses, Dissertations, Professional Papers, and Capstones

Orthodontic tooth movement requires coordinated bone resorption and deposition in response to mechanical stimuli. Underlying this process is a complex network of biological signaling to activate osteoclasts and osteoblasts. The broad category of small proteins known as cytokines include many potential mediators involved in complex interactions to initiate tooth movement. One of the signaling factors is interleukin-1β (IL-1β), which plays a critical role in inflammation and bone erosion via the activation of osteoclasts. IL-1β is a key cytokine involved in osteoclast differentiation, multinucleation, and overall survival. Recently, interleukin-17 (IL-17) has been identified as a potent inducer of inflammation that influences …

The Effects Of Physical Attractiveness In The Health Care Industry, Richard Shane Westfall

UNLV Theses, Dissertations, Professional Papers, and Capstones

Physical appearance has a far-reaching influence on a variety of human interactions, yet the effects on one domain has been largely ignored. This dissertation examines the potential effect of physical attractiveness on health care quality. Theoretical explanations for the development of both prejudice and stereotypes are presented, with a focus on the development and effects of attractiveness-based stereotypes. Several studies have found that workers in the medical field are susceptible to the same biases as the general public and that these are associated with lower health care quality for those more marginalized by society. Therefore, two studies were conducted to …

The Life Of A Marimba Master: Zeferino Nandayapa Ralda; Composer, Band Leader, Soloist, Lindsay Michelle Whelan

UNLV Theses, Dissertations, Professional Papers, and Capstones

Zeferino Nandayapa Ralda was the greatest Mexican marimba artist of the twentieth century. Born in Chiapas, Mexico, Zeferino was the youngest son of Norberto Nandayapa, the most well respected Mexican marimba builder of his time. Throughout Zeferino’s lifetime, he

cultivated a career that made him well-known in Mexico and firmly established the name Nandayapa as being synonymous with the word marimba. Zeferino’s career consisted of appearances as a solo artist, as a featured soloist with symphony orchestras around Mexico, as leader of marimba bands, and, many appearances abroad. He wrote many arrangements of standard Mexican folk songs, classical literature, as …