Digital Commons Network^™

Restructuring Of The Axon Initial Segment In Mouse Models Of Neurodevelopmental Disorders, Rachel Ali Rodriguez

UNLV Theses, Dissertations, Professional Papers, and Capstones

Neurodevelopmental disorders (NDDs) affect more than 36% of children in countries with low- and middle- incomes (Boivin, 2015; McCoy, 2016). Interestingly, these heterogeneous disorders share a high incidence of epileptic seizures, suggesting a shared pathology. Seizures result when neuronal firing activity becomes disturbed and neurons fire excessively or in unregulated patterns. A key site in the control of neuronal firing patterns is the axon initial segment (AIS), where the local density of proteins and the morphology of the AIS in part determine the firing of neurons. We hypothesized that a disruption in the morphology and/or composition of the AIS can …

Blanche Dubois: A Woman's Journey From Belle Reve Through Tarantula Arms To The Elysian Fields, Raluca Daniela Comanelea

UNLV Theses, Dissertations, Professional Papers, and Capstones

This present thesis aims at deconstructing the main character of A Streetcar Named Desire by Tennessee Williams: Blanche DuBois. Blanche’s journey is traced from Death to Desire and finally, to an ultimate envisioned destination, The Elysian Fields, which represents her physical and spiritual burial at sea, with her soul ultimately reaching heaven. Blanche’s most important quality - her ability to seduce audiences into perceiving the multifaceted layers of her feminine character all at once - marks her entry into Williams’s theatre of excess. Her theatricality springs precisely from her fascinating ability to reconstruct her persona in the course of the …

On Improving Performance Of The Binary Logistic Regression Classifier, Michael Chang

UNLV Theses, Dissertations, Professional Papers, and Capstones

Logistic Regression, being both a predictive and an explanatory method, is one of the most commonly used statistical and machine learning method in almost all disciplines. There are many situations, however, when the accuracies of the fitted model are low for predicting either the success event or the failure event. Several statistical and machine learning approaches exist in the literature to handle these situations. This thesis presents several new approaches to improve the performance of the fitted model, and the proposed methods have been applied to real datasets.

Transformations of predictors is a common approach in fitting multiple linear and …

Reconciling Incongruencies: Examining The Meaning And Influencing Factors Of Oncology Nurses' Professional Quality Of Life, Rebecca Lynne Boni

UNLV Theses, Dissertations, Professional Papers, and Capstones

Nurses often witness suffering and loss. These experiences are intrinsic to the practice of nursing and can exert a strong, cumulative effect on nurses’ professional quality of life (QOL). Stamm (2010b) conceptualizes professional QOL as a composite of compassion fatigue and compassion satisfaction. Inferior professional QOL has been linked to numerous negative healthcare outcomes. Oncology nurses are particularly vulnerable to compassion fatigue. The Professional Quality of Life Scale (ProQOL), created by Stamm (2009), is the current survey used to measure professional QOL, but it may not be specific enough for oncology nurses.

The purpose of this grounded theory study was …

Infection Control: The Nurse's Responsibility, Marisa Francis

UNLV Theses, Dissertations, Professional Papers, and Capstones

Over the last century and a half, infection control measures implemented by nursing staff have continued to evolve, resulting in improved patient outcomes. While this progress is impressive, a decline in rates of hospital acquired infections (HAIs) seems to have slowed, with only a 0.5% decrease in the last seventeen years. Unfortunately, nurses are rarely provided educational support on infection control practices beyond undergraduate and new employee trainings. Meanwhile, the Centers for Disease Control (CDC) is frequently updating their infection control practice recommendations.

The purpose of this project was to observe the current rate of infection control compliance by nurses, …

External Voting In Developing Countries: Strategic Bargaining And The Role Of Remittances, Hafthor Erlingsson

UNLV Theses, Dissertations, Professional Papers, and Capstones

This study and numerous prior works have argued that remittances increase the likelihood that states will implement external voting. However, quantitative studies have generally failed to find a relationship between reliance on remittances and the adoption and implementation of external voting. In this study it is argued that the pooling of observations from developed and developing countries as well as autocracies and highly consolidated democracies has altered previous results. Most studies have also not investigated possible non-linearities in the relationship between remittances and external voting. The results of this study illustrate the non-linear influence remittances have on non-autocratic developing countries …

Examining The Effectiveness Of A 4d Schedule And A Virtual Reality Model On A Modular Project: Unlv Solar Decathlon Case, Rajarshi Ghimire

UNLV Theses, Dissertations, Professional Papers, and Capstones

The use of a 4D schedule as technological advancement has brought significant improvement to the planning and execution of construction projects, through visualizing stepwise construction progress, following a sequence of pre-planned activities, and finalizing a baseline schedule with necessary changes. Moreover, the application of virtual reality (VR) to create interactive 3D models of a planned structure has made it possible to make a detailed planning of any construction project. Because of these benefits, the use of 4D schedules and VR in the construction industry has increased drastically, leading to improved planning and execution. However, past studies have given little attention …

Consequences Of Math Anxiety And Stereotype Threat: An Intersectional Perspective, Jennifer E. John Buck

UNLV Theses, Dissertations, Professional Papers, and Capstones

Individuals with science, technology, engineering, and math (STEM) skills are highly valued for their contribution to the U.S. workforce and society. However, women and some people of color enter STEM fields at lesser rates than do White men. Math anxiety and stereotype threat have been found to cause math performance decrements for women and some people of color. Presently, it is not clear how math anxiety and stereotype threat might work together to dually influence math performance and subsequent STEM participation. The current study focuses on a diverse sample of 295 undergraduate students who were randomly assigned to one of …

Visual Attention And Emotion Regulation In Schizophrenia, Bern Lee

UNLV Theses, Dissertations, Professional Papers, and Capstones

Emotion regulation and emotion processing deficits cut across the varying symptom presentations of schizophrenia. Emotion processing deficits are inadequately treated by pharmacologic interventions and are related to real-world functional impact and disability. This study investigated behavioral and psychophysiological responses to a series of emotion regulation tasks while concurrently collecting eye tracking data as an index of visual attention. A brief neurocognitive assessment was also completed in order to examine potential cognitive determinants of emotion. Participants completed tasks designed to assess cognitive change and directed attention strategies for down-regulation of unpleasant and pleasant emotion. For each of our two unpleasant emotion …

The Impact Of Virtual Presence On Willingness To Book: The Moderating Role Of Self-Construal And Gender, Sung Jun Joe

UNLV Theses, Dissertations, Professional Papers, and Capstones

Social influence is not limited only to interactive situations but also includes those that occur without a direct interaction such as the mere presence of others (Argo, Dahl, & Manchanda, 2005). Although there is wide agreement that the mere presence of others influences one’s decision-making process, little research is conducted to understand whether the effect of the presence of others influences consumer behaviors in an online context (Naylor, Lamberton, & West, 2012). To address this gap, this study suggests that mere virtual presence (MVP) provides social cues to the customer and influences the customer’s willingness to book (WTB). Specifically, the …

Effect Of Bundled Payments As A Care Improvement Initiative On Hospital Care Of Total Joint And Sepsis: A Perspective On Organizational Effectiveness, Pearl Kim

UNLV Theses, Dissertations, Professional Papers, and Capstones

This study investigates the potential impact of the Bundled Payments for Care Improvement (BPCI) initiative from Center for Medicare and Medicaid Services on hospital performance and behavior related to effectiveness and efficiency. The BPCI is under the Affordable Care Act and provides hospitals with a fixed amount of reimbursement for a total episode of care. Building on the agency theory, I argue that the BPCI initiative has the potential to enhance the effectiveness and efficiency of hospital care. This quasi-experimental study examines the changes in hospital care outcomes of patients with replacement of the lower extremity or sepsis in BPCIparticipating …

On Muddy Banks: An Ecoethnography Of A River Island Community, Nicholas Baxter

UNLV Theses, Dissertations, Professional Papers, and Capstones

In this study, I examine the relationship between a river and a community. Specifically, I analyze the processes and patterns that organize the nature-society relationship and define the river town of Sabula, IA. To guide my historical and ethnographic analysis, I utilize a co constructionist posture (Rice 2013), which sees culture, community, economy, and physicality as much a product of bio-physical forces as social forces. My aim is to understand how Sabula is conjointly constructed and reveal the nuanced interconnections between human communities and nature through which social and environmental problems play out. My analysis clarifies patterns in residents’ identity …

International Faculty’S Lived Experience Of Teaching: A Multiple-Case Study Of Taiwanese Professors In The United States, Ching Hsu Kim

UNLV Theses, Dissertations, Professional Papers, and Capstones

In the context of higher education, a tenure-track faculty is expected to be actively engaged in scholarly activities including research, teaching and service activities. Finding a balance between personal and career lives is seen critical yet challenging especially to early-career international faculty members while they are in the face of differences and changes. Framed by theories of perezhivanie and resilience, the study examined international faculty members’ lived experiences of teaching. Interviews, blog prompts and reflection prompts were used to identify their major difficulties, perceptions and adjustments, and resilience development. Findings suggest that faculty members unavoidably encountered difficulties in their beginning …

Moisture Dynamics Of A Near-Surface Desert Soil, Yuan Luo

UNLV Theses, Dissertations, Professional Papers, and Capstones

Desert soils cover about one third of the Earth’s land surface. Despite their large extent, however, our understanding of desert soil hydraulic processes and properties is still rather limited. In particularly with respect to the near-surface (top centimeters) of the soil profile, which play a critical role for infiltration, redistribution and evapotranspiration of rainwater, the limiting resource for life in desert environments, but also hosts most of the biologic activity and controls runoff, erosion as well as the emission of dust (Nannipieri et al.,2003; Bradford et al.,1987). Additionally, deserts are ideal locations for electricity generation with solar energy using large-scale …

Utility Of Bench Scale Sand Tank Experiments At Assessing Permeable Reactive Barrier Design, Brandon Meier

UNLV Theses, Dissertations, Professional Papers, and Capstones

The objective of this work was to evaluate the utility of bench scale sand tank experiments at assessing permeable reactive barrier (PRB) design. Our criteria for meeting this goal was that differences between PRB designs could be identified solely by measuring concentration in outflow from the sand tank models. For our PRB designs (funnel-and-gate, staggered wells, and parallel bars), numerical simulations clearly showed that PRB design had a quantifiable effect on outflow concentration, provided that the solute reacted with the PRB materials. Conversely, use of a conservative (non-reactive) solute did not allow us to discern between PRB design alternatives. Employing …

A Binding Sisterhood Of Transnational Feminism: A Close Look At Iran And Argentina, Bernadette Mary Lazar

UNLV Theses, Dissertations, Professional Papers, and Capstones

This dissertation examines the impact of transnational feminism in Iran and Argentina. Specifically, it focuses on the role of the diaspora and international communities and their interactions with social movements in these two countries. Although the study of transnational feminism is not a new phenomenon, very little research has been dedicated towards distinguishing the effects and differences in outcomes when either the diaspora or the broader international network is involved. By filling this gap in the literature, this dissertation will shed light on whether the diaspora community, NGOs, or the international community is necessary for success or favorable outcomes in …

Alkali-Silica Reactivity Of Mortars Containing Natural Pozzolan, Arash Kian

UNLV Theses, Dissertations, Professional Papers, and Capstones

Alkali-silica reactivity is one of the most recognized deleterious phenomena in Portland cement concrete resulting in cracks, spalling, and other deleterious mechanisms.

The aim of this study was (i) to assess the extent of reactivity of the aggregates, quarried from seven different sources, suspected of being conducive to ASR, and (ii) to compare the effectiveness of industrial (Class F fly ash) and natural pozzolans in mitigation of alkali-silica reactivity of the studied aggregates. To this end, seven aggregate sources, four natural pozzolan sources, and one source of Class F fly ash were used. ASTM Type V Portland cement was replaced …

Mojave Desert Plant Community Long-Term Response To Disturbance, Dominic M. Gentilcore

UNLV Theses, Dissertations, Professional Papers, and Capstones

All vegetation communities have been shaped by disturbances. This dissertation consists of three separate chapters: Blackbrush (Coleogyne ramosissima) natural regeneration in the Great Basin-Mojave Desert Transition Zone on two fires, Long-term Response to Fire in Eastern Mojave Desert semi-arid shrubland communities, and an Annotated Checklist of Gold Butte National Monument in the Mojave-Colorado Plateau Transition Zone. The section on blackbrush natural regeneration was a long-term dataset from two fires in Basin and Range National Monument that burned in 2008 with monitoring events in 2009, 2010, 2011, 2018 and 2019. The monitoring documented some of the strongest post-fire regeneration for the …

Mental Accounting And Unplanned Purchases In Online Booking: The Role Of Discount, Impulse Buying, And Thinking Style, Esther L. Kim

UNLV Theses, Dissertations, Professional Papers, and Capstones

To minimize the high cost of commissions of online travel agencies (OTA), the majority of hospitality operators provide member only exclusive rates to encourage consumers to book on their websites directly. However, the revenue cannot be maximized due to the amount of discount. This dissertation suggests that hospitality operators may maximize their profit with the adoption of surprise discount to increase consumers’ unplanned purchases. Applying the mental accounting principle, this dissertation examines how consumers respond to a surprise discount when they make unplanned purchases, such as purchasing add-on items online. This dissertation utilized three experiments in an online hotel booking …

Living On The Move: The Digital Nomad Mobile Phenomenon Identity And Practice, Virginia Rachele Smercina

UNLV Theses, Dissertations, Professional Papers, and Capstones

The following exploratory project used a qualitative mixed method approach by means of a preliminary blog analysis of thirty-seven blogs and twenty-five semi-structured interviews for data collection on individuals known as digital nomads. The theoretical foundations of this study are centered on practice theory, structuration theory, as well as discussions surrounding cultural identity. The project’s aim is to increase our understanding of the digital nomad phenomenon by asking four research questions: Who are the digital nomads? How is digital nomadism practiced? Why choose to live on the move? Is digital nomadism sustainable? The discussion includes how the digital nomad identity …

Chatting Online: An Ethnographic Case Study Of Educator Discourse On Social Media, Lindsay J. Russell

UNLV Theses, Dissertations, Professional Papers, and Capstones

This study sought to examine the online discussions of teachers located in the Southwestern area of the United States regarding social justice issues on social media. Specifically, it looked to discover how educators in this region are attempting to assert agency when faced with socially inequitable situations. Teachers in this region are hired as public employees in a state that penalizes public workers for exhibiting opinions (SRS § 288.260, 1969).

The study utilized Cultural Historical Activity Theory along with Critical Multiculturalism to demonstrate that our present actions are culturally and historically situated while illuminating hegemonic forces. The study found that …

Cfd Simulation Investigating The Effects Of Groove Geometry On Heat Transfer For Internally Grooved Tubes, Richard Zaven Saroukhanoff

UNLV Theses, Dissertations, Professional Papers, and Capstones

This numerical study investigates the thermal performance of internally grooved tubes used in heat exchangers. In order to enhance the performance of heat exchangers, turbulence promoters are inserted along the streamwise flow. The use of inserts, grooves, and augmentations along the axial length of the tube creates disturbances that improve the overall heat transfer due to enhanced fluid mixing and greater surface contact boundary walls. However, the implementation of tube wall augmentations creates an increase in pressure drop across the tube which must be compensated for with additional pumping power for the working fluid. Therefore, in order to analyze the …

Improving Community College Students' Interest, Utility-Value, And Performance: How Does Future Time Persective Influence A Utility-Value Intervention?, Elsa Maria Mason

UNLV Theses, Dissertations, Professional Papers, and Capstones

The economic benefits of academic success and completion are long-lasting. Students who attend community colleges can stand to benefit a great deal by completing a 4-year degree or even a 2-year degree. Unfortunately, these students often begin their higher education journey not fully prepared for college-level coursework. Students often fail to see how their college coursework relates to their lives and in turn, don’t hold interest or perceive value for the course and consequently do not perform well. Using Eccles et al. (1983) expectancy-value theory this study tested how community college students would respond to a utility-value intervention in which …

The Effects Of Background, Classroom Assessment Competence, Self-Efficacy, And Self-Perceived Assessment Skills On Classroom Assessment Practices Of Teachers In India, Manognya Murukutla

UNLV Theses, Dissertations, Professional Papers, and Capstones

Teacher-conducted assessments are necessary to gather important information to facilitate student learning and academic success. Unfortunately, there is an inconsistency in teacher knowledge of assessment and assessment practices. While previous research identified a gap in teacher competence and teacher perceptions of their competence, and this affects classroom assessment practices that then impact student learning, the research is limited, outdated, and not grounded in any theoretical framework. This study addresses gaps in literature and establishes self-efficacy as a theoretical framework in which classroom assessment can be studied. Data were collected in India, and a path analysis and a Kruskal Wallis non-parametric …

Design Of Efficient Carbon-Based Adsorbents For The Removal Of Organic And Inorganic Water Contaminants, Sayedeh Soroosh Mortazavian Dehkordi

UNLV Theses, Dissertations, Professional Papers, and Capstones

Granular activated carbon (AC) and biochar (BC) are two carbon-based adsorbents commonly used for water and wastewater treatment. However, these adsorbents have drawbacks that suppress their aqueous contaminants removal efficiency. Their major disadvantages are that AC has low selectivity and reusability potential, and BC has a hydrophobic nature.

The scope of this dissertation is to enhance the performance of commonly-used carbon-based adsorbents for the removal of organic and inorganic water contaminants and to understand the interactive mechanism of contaminants’ ions/molecules with adsorbents. Hexavalent chromium (Cr(VI)) and trichloroethylene (TCE) are two types of inorganic and organic water contaminants, respectively, which are …

High-Speed Radhard Mega-Pixel Cis Camera For High-Energy Physics, Wenlan Wu

UNLV Theses, Dissertations, Professional Papers, and Capstones

This dissertation describes the schematic design, physical layout implementation, system-level hardware with FPGA firmware design, and testing of a camera-on-a-chip with a novel high-speed CMOS image sensor (CIS) architecture developed for a mega-pixel array. The novel features of the design include an innovative quadruple column-parallel readout (QCPRO) scheme with rolling shutter that increases pixel rate, its ability to program the frame rate and to tolerate Total Ionizing Dose effects (TID). Two versions of the architecture, a small (128 x 1,024 pixels) and large (768 x 1,024 pixels) version were designed and fabricated with a custom layout that does not include …

Forgetting Distractors: Inhibition Or Decay?, Laura Werner

UNLV Theses, Dissertations, Professional Papers, and Capstones

Research on forgetting irrelevant information in working memory (WM) has supported two

conflicting theories, inhibition (Oberauer & Lewndowsky, 2016) and decay (Dagry et al., 2017;

Dagry & Barrouillet, 2017). However, these conflicting results may be due to the fact that different methods were used to assess each model. In Experiment 1, we combined those methods to create a modified distractor span task that allows for a direct comparison of the models. Participants processed words that were to be remembered (targets) and others that were to be forgotten (distractors); the amount of free time after each distractor varied, with total trial …

On The Human Factors Impact Of Polyglot Programming On Programmer Productivity, Phillip Merlin Uesbeck

UNLV Theses, Dissertations, Professional Papers, and Capstones

Polyglot programming is a common practice in modern software development. This practice is often considered useful to create software by allowing developers to use whichever language they consider most well suited for the different parts of their software. Despite this ubiquity of polyglot programming there is no empirical research into how this practice affects software developers and their productivity. In this dissertation, after reviewing the state of the art in programming language and linguistic research pertaining to the topic, this matter is investigated by way of two empirical studies with 109 and 171 participants solving programming tasks. Based on the …

The Parallel Security Apparatus: Examining The Cases Of Baathist Iraq, Syria, And Iran, Donald Utchel

UNLV Theses, Dissertations, Professional Papers, and Capstones

This dissertation examines the phenomena of the parallel security apparatus in the cases of Baathist Iraq, Syria, and Iran. Parallel security structures are often limited to books and articles published on secret police organizations in the broader security literature. Their research often focuses on one branch of the parallel security apparatus rather than examining all the parallel security institutions of that particular regime. This body of research attempts to bring further light to this particular phenomenon by examining all the parallel security institutions in a particular case and to connect and trace the various parallel security institutions to see if …

Pressure Driven Electronic Band Gap Engineering In Tin(Iv)-O,N Compounds, Daniel Thomas Sneed

UNLV Theses, Dissertations, Professional Papers, and Capstones

The intrinsic link between long-range order, coordination geometry, and the electronic properties of a system must be understood in order to tailor function-specific materials. Although material properties are typically tailored using chemical dopants, such methods can cause irreversible changes to the structure, limiting the range of functionality. The application of high pressure may provide an alternative “clean” method to tune the electronic properties of semiconducting materials by tailoring their defect density and structure.

We have explored a number of optoelectronic relevant materials with promising characteristics, specifically Sn-(O,N) compounds which have been predicted to undergo pressure-mediated opening of their optical band …