Digital Commons Network^™

Comparison Of Cervical Angle During Different Equipment Removal Techniques Used In Ice Hockey For Suspected Cervical Injuries, Kendell Sarah Galor

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of the study was to compare cervical movement between two different methods of removal of the helmet and shoulder pads. Seven college age male subjects (height: 172.54 ± 7.98 cm; weight: 85.70 ± 15.75 kg) with hockey experience volunteered to participate in the study. Each subject agreed to and signed the institutional review board approved informed consent before articipation. Subjects used their own game fit hockey helmet and were fitted with a pair of shoulder pads (CCM Tacks 1052 Sr Shoulder Pads). Cervical spine motion was measured using 3D kinematics (Vicon Motion Systems Ltd., UK). Reflective markers affixed …

Identifying Youth At Risk For Problematic Absenteeism Using Nonparametric Modeling: The Impact Of Youth Psychopathology And Family Environment Risk Factors, Mirae Fornander

UNLV Theses, Dissertations, Professional Papers, and Capstones

The best cutoff to differentiate problematic school absenteeism from nonproblematic school absenteeism has yet to be identified in the literature (Lyon & Cotler, 2007). Contemporary classification systems, including Multi-Tiered Systems of Support (MTSS), depend upon cutoffs to clearly define the various tiers (Jimerson, Burns, & VanDerHeyden, 2016). The current study aimed to inform the MTSS approach while also contributing to early identification, assessment, and intervention methods for those youth and families at the highest risk of problematic school absenteeism and its negative consequences. The current study identified subgroups of youth at the highest risk of problematic absenteeism, defined as equal …

A Framework To Capture Dynamic Traffic Trends From Historical Sensor Data, Carlos Gaviria

UNLV Theses, Dissertations, Professional Papers, and Capstones

The typical approach of increasing infrastructure to alleviate traffic issues such as congestion is becoming unviable due to limited space, high cost, and associated externalities. Control and management strategies using Intelligent Transportation Systems (ITS) seek to maximize the use of existent infrastructure. Many ITS strategies, such as the deployment of information, require or benefit from knowledge about traffic patterns and trends. This study proposes a mathematical programming formulation and solution algorithm that considers multiple time intervals for the estimation of network-wide traffic states and calculation of the corresponding transition probabilities. The proposed solution enables the determination of sections of the …

Mechanisms For The Incorporation And Distribution Of Radionuclides In Near-Surface Fallout, Marc Alan Fitzgerald

UNLV Theses, Dissertations, Professional Papers, and Capstones

Fallout is the radioactive glass formed from a mixture of vaporized anthropogenic materials with proximate environmental material. These glassy byproducts constitute a compositional record of environmental materials such as soil and vapor precursors that are responsible for chemical heterogeneity in the glasses. The work of this dissertation is to untangle these different sources of compositional heterogeneity, distinguishing low-abundance vaporized anthropogenic-rich material from natural compositions, in order examine soil behavior and chemical evolution during fallout formation. Unfortunately, mixing convolutes the multivariate elemental relationships in these melts due to overlapping element abundances that might distinguish different source materials and chemical behaviors, making …

Influencing Hawai‘I Hotel Patrons To Use Reef-Safe Sunscreens, Rochelle Good

UNLV Theses, Dissertations, Professional Papers, and Capstones

The health of Hawaiian coral reefs is threatened by pollution from common sunscreen ingredients such as oxybenzone. Hawai‘i hotel patrons using sunscreens with harmful ingredients contaminate coral reefs when these products wash off while swimming or bathing. Reef-safe sunscreens are alternative sunscreens that provide effective sun protection while averting damage to coral reefs. The purpose of this research was to determine the dominant factors leading to the pro-environmental behavior of using reef-safe sunscreen and identify practices that Hawai‘i hotel operators could implement to influence patrons to engage in this behavior. This research applied an integrative conceptual framework to model pro-environmental …

Managing Data-Driven Change: A Model Of Unintended Deviation, Sang-Mun Ray Cho

UNLV Theses, Dissertations, Professional Papers, and Capstones

Data-driven change in hospitality gaming is desirable because of the opportunities to leverage untapped sources of rich and abundant marketing data. However, change has been difficult to implement as indicated by a lack of widespread adoption. Some have attributed these difficulties to cultural, structural, and other generic factors but these explanations fail to explain the root dynamics of data-driven change.

In this dissertation, it is theorized that data-driven change requires a particular form of social interaction, which are called analytical bonds (AB). The suggestion was that there is a sender of an analytic deliverable and a receiver that makes a …

Optimization Of Useful Hard X-Ray Photochemistry, David Lewis Goldberger

UNLV Theses, Dissertations, Professional Papers, and Capstones

X-ray induced damage is generally considered a nuisance, but in the field of Useful Hard X-ray Photochemistry we harness the highly ionizing and penetrating properties of hard X-rays (> 7 keV) to initiate novel photochemical decomposition and synthesis at ambient and extreme conditions. Preliminary experiments suggest that the energy of irradiating photons and the sample pressure play roles in determining the nature of X-ray induced damage. Here, we present the X-ray energy dependence of damage induced in strontium oxalate, strontium nitrate, and barium nitrate, as well as the pressure dependence of X-ray induced damage of strontium oxalate. Our results indicate …

Disastrous Voting, Moritz Peter Rissmann

UNLV Theses, Dissertations, Professional Papers, and Capstones

The central question of this study is ’Is there an observable general trend of electorates punishing incumbents for natural disasters across countries and elections?’ Many scholars have argued for the existence of such behavior, yet the empirical evidence rests mostly on single-country and even single-election studies. I look for a generalizable trend in two original data sets with country-election and country-constituency-election as the unit of analysis respectively. I test the punishment hypothesis by correlating the occurrence of natural disasters to the performance of incumbent parties in national lower house elections. Furthermore, I propose that the effect of natural disasters on …

A Qualitative Multiple Case Study Of The Transition Experiences Of Parents And Service Providers Of Individuals With Intellectual/Developmental Disabilities (Idd) In A Postsecondary Educational Program, Rebecca S. Rogers

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this qualitative case study was to explore the transition experiences of parents of young adults with IDD who are currently enrolled in a postsecondary educational

program in the Southwest part of the United States. This qualitative multiple-case study used Schlossberg’s transition theory to frame the cases for this report. Schlossberg’s transition theory examines the way in which adults move through various transitions in their lives and what strategies they use to cope with the transitions. The theory identifies three different types of transitions: anticipated transitions, unanticipated transitions, and nonevent transitions. In addition, the theory identifies four coping …

Doing Business In America: A Jewish History, Purdue University Press

The Jewish Role in American Life: An Annual Review

American and Jewish historians have long shied away from the topic of Jews and business. Avoidance patterns grew in part from old, often negative stereotypes that linked Jews with money, and the perceived ease and regularity with which they found success with money, condemning Jews for their desires for wealth and their proclivities for turning a profit. A new, dauntless generation of historians, however, realizes that Jewish business has had and continues to have a profound impact on American culture and development, and patterns of immigrant Jewish exploration of business opportunities reflect internal, communal, Jewish-cultural structures and their relationship to …

Contributors, Westview Staff

Westview

No abstract provided.

Parametric Design And Optimization Of A Pivoting S-Type Rudder For Containerships, Chen-Wei Chen, Tsung-Yueh Lin, Bo-Yen Chen, Jen-Shiang Kouh

Journal of Marine Science and Technology–Taiwan

This study proposes an energy-saving S-type rudder design to deal with the inhomogeneous inflow from a rotating propeller behind a containership. The S-type rudder was modelled parametrically using four-digit NACA foils as section profiles together with Non-uniform rational B-splines (NURBS) surface formulations. A three-stage optimization process is proposed to reduce the number of design iterations necessary to achieve an optimal design. The propulsion simulations were done via CFD software, which solves the hydrodynamics of viscous flow, as governed by the Reynold-averaged Navier-Stokes (RANS) equations. Validations were performed with experimental model tests, including hull resistance, propeller open-water performance, and propulsion in …

A Controlled Trial Of Mobile Short Message Service Among Participants In A Rural Cardiovascular Disease Prevention Program, Maria Odette Gore, Mori J. Krantz, Karen Albright, Brenda Beaty, Stephanie Coronel-Mockler, Sheana Bull, Raymond O. Estacio

Sociology and Criminology: Faculty Scholarship

The statewide Colorado Healthy Heart Solutions (CHHS) program provides cardiovascular disease (CVD) risk factor screening and education to the medically underserved and has been shown to improve CVD risk profiles. We aimed to enhance its effectiveness through addition of a mobile health (mHealth) intervention using SMS messaging (termed Cardio SMS). We conducted a prospective, non-randomized controlled pilot trial of this intervention implemented at 5 rural program sites (number of participants N = 204) compared with a contemporaneous propensity-score matched control group from 14 CHHS sites not receiving the intervention (N = 408) between 2012 and 2014. All participants were …

Pledges Of Faith: The Development Of Ancient Roman Business Law And Contemporary Applications, Devon Guanci

History & Classics Undergraduate Theses

It is no secret that the legacy of both the Roman Republic and Empire continue to influence Western culture and lifestyle today. In this thesis, I will specifically consider the development of Roman commercial and contract law. As Rome experienced continued expansion into the imperial age, commerce, use of contracts, and global trade worked to establish a robust economy in the empire. Thus, the established system of commercial law created a stable backbone that was necessary for the longevity of ancient Rome. While the modern United States is unlike Rome in many ways, many of the laws, as well as …

The Independent Reign Of Queen Victoria, Emilee Serwan

History & Classics Undergraduate Theses

Queen Victoria is one often most well know monarchs in both English and global history due to the extent of her empire, her personal achievements and for being the second longest reigning monarch in England. However, many have questioned if this reign was hers or if she was actually a figurehead, instead, controlled by the men in her life. In analyzing Victoria’s life and studying her diaries and letters, as well as, the writings of people surrounding her, it is evident that that her reign was ultimately led out of her own control and independently. Victoria did not see her …

Soldiers’ Motivations To Fight In World War Ii: The United States Army And The German Wehrmacht In The European Theatre, Anthony E. Hart

History & Classics Undergraduate Theses

The European theatre of the Second World War has often been perceived as an ideological conflict driven by nationalism and patriotism. Ideology, patriotism, and nationalism may have been the motivations of leaders and citizens on the home front in Germany and the United States, but what about the men in the American and German armies fighting on the front lines? They may have been similarly motivated prior to their deployment, but what motivated soldiers in the U.S. Army and the Wehrmacht to continue fighting as the war dragged on and as they endured the horrors of combat? Were the motivational …

Watch & Learn - A Teacher's Guidebook For Film-Based Esl Course, Xiaoxue Zhu

Master's Projects and Capstones

Educators in the 21st century are continuously discovering more engaging teaching tools to facilitate language learners. In today's increasingly developing visual world, film stands out from other traditional materials for its unique features, such as the visuality and authenticity. With appropriately designed activities, film could be a valuable resource in teaching English as a second language (TESOL) setting, and also a perfect tool for inspiring cross-cultural communication and promoting critical thinking skills.

However, research has shown that ESL teachers feel reluctant to use film as a significant component in their classrooms even though they have recognized and affirmed the benefit …

Chemically Modified Monolayer Surfaces Influence Valvular Interstitial Cell Attachment And Differentiation For Heart Valve Tissue Engineering, Matthew N. Rush

Nanoscience and Microsystems ETDs

As a cell mediated-process, valvular heart disease (VHD) results in significant morbidity and mortality world-wide. In the US alone, valvular heart disease VHD is estimated to affect 2.5% of the population with a disproportionate impact on an increasing elderly populous. It is well understood that the primary driver for valvular calcification is the differentiation of valvular interstitial cells (VICs) into an osteoblastic-like phenotype. However, the factors leading to the onset of osteoblastic-like VICs (obVICs) and resulting calcification are not fully understood and a more complete characterization of VIC differentiation and phenotypic change is required before treatment of valve disease or …

Improve The Low Energy Sensitivity Of The Hawc Observatory, Zhixiang Ren

Optical Science and Engineering ETDs

The high altitude water cherenkov gamma-ray observatory (HAWC) has been fully operational since March of 2015 in Mexico at 4,100 meters above sea level on the hillside of the Sierra Negra Volcano. It consists of an array of 300 water cherenkov detectors, each equipped with four photo-multiplier tubes. HAWC operates 24-hours per day with a wide field-of-view (FOV, ∼ 2 sr) and a high duty cycle (∼ 95%). These make it a powerful survey and monitoring experiment for mapping the gamma ray sky at very high energies (VHE, 100 GeV to 100 TeV) and to study sources with varying intensities. …

Introduction: Reworking Walter Scott, Daniel Cook, Lucy Wood

Studies in Scottish Literature

An overview of Walter Scott's contemporary celebrity and evolving reputation, of scholarship on his afterlives, of the way his work has been reshaped in a variety of settings and media, and of the essays collected in this special issue.

Stability Of A Spinning Triangle Tethered Spacecraft System In A Circular Orbit, Matthew James Heitstuman

Mechanical Engineering ETDs

Equations of motion are derived for a spinning triangle tethered spacecraft system and are used to analyze the stability of such systems. Floquet theory is applied to the linearized, periodic coefficient, equations of motion to analyze spin stability as a function of triangle geometry and the average spin rate of the satellite relative to the angular velocity of the spacecraft orbiting around a central body. The results of the Floquet analysis show that spin stability is achievable for many combinations of spacecraft geometry and spin rate. Spacecraft engineers or operators for a triangle-shaped tethered spacecraft can use this information for …

Universities In Imperial Austria, 1848–1918: A Social History Of A Multilingual Space, Jan University Surman

Purdue University Press Books

Combining history of science and a history of universities with the new imperial history, Universities in Imperial Austria 1848–1918: A Social History of a Multilingual Space by Jan Surman analyzes the practice of scholarly migration and its lasting influence on the intellectual output in the Austrian part of the Habsburg Empire.

The Habsburg Empire and its successor states were home to developments that shaped Central Europe's scholarship well into the twentieth century. Universities became centers of both state- and nation-building, as well as of confessional resistance, placing scholars if not in conflict, then certainly at odds with the neutral international …

Examining Environmental Hazards In Rental Homes And Habitability Laws In Clark County, Nevada, Jorge Luis Bertran

UNLV Theses, Dissertations, Professional Papers, and Capstones

It is well established that home conditions are linked to the health outcomes of occupants. There are over 880,000 housing units in Clark County, Nevada; nearly half of those are renter-occupied units (ROUs). Currently, there is limited research on the characteristics of environmental hazards found in Clark County ROUs and the strength of habitability statutes created to protect tenants from substandard housing. Understanding how renters in Clark County are affected by environmental hazards in ROUs and the processes by which landlords and tenants resolve grievances related to those hazards would benefit public health. It would enhance the ability to quickly …

Literature In The World: A Critical Discourse Study Of World Literature Pedagogy, Elisa Cogbill-Seiders

UNLV Theses, Dissertations, Professional Papers, and Capstones

“Literature in the World” is a critical discourse analysis of world literature pedagogy in U.S. higher education. It investigates the ways discourse communities in higher education produce and shape the field of world literature. The dissertation begins by establishing and analyzing the generic conventions of university mission statements, finding they are primarily dominated by discourse on global learning. It follows with an analysis of world literature course descriptions from the same schools. World literature course descriptions alternatively replicate, resist, or subvert global learning discourses. The last chapter uses findings from the first two chapters to trace how university and instructor …

Design And Preliminary Evaluation Of A Supercritical Carbon Dioxide Brayton Cycle For Solar Dish Concentrator Clean Energy Production, Danielle Nobles-Lookingbill

UNLV Theses, Dissertations, Professional Papers, and Capstones

As we move toward energy independence and more ambitious clean energy goals, solar energy research must push the efficiency limits of traditional energy generation systems. Increases in efficiency can be achieved by increasing the hot temperature of the power cycle. Recent research demonstrates the potential for increased efficiency and a vastly smaller component size when supercritical carbon dioxide Brayton power cycles are used. Concentrated solar and nuclear heat sources are capable of achieving the high working fluid temperatures needed for significant efficiency gains. This NSF EPSCoR funded, experimental research system is designed to exploit the uniquely immense solar irradiance of …

A Qualitative Study Of School Psychologists' Perception And Interpretation Of Their Professional Identity, Elizabeth A. Sanders

UNLV Theses, Dissertations, Professional Papers, and Capstones

The primary focus or aim of this qualitative multiple-case study was to increase understanding of how experienced school psychologists define themselves as professionals within the field, taking into consideration the profession’s collective or organizational identity, the parameters established by the organization, and the actual performance of the job within the educational setting. Specifically, this study examined how the individuals’ definitions had changed over time and what lived experiences led to development and change in professional identity. Six school psychologists with 10 or more years of experience from a large urban Southwestern school district’s school psychology department were invited to participate. …

Analysis And Design Of Analog Front-End Circuitry For Avalanche Photodiodes (Apd) And Silicon Photo-Multipliers (Sipm) In Time-Of-Flight Applications, Vikas Vinayaka

UNLV Theses, Dissertations, Professional Papers, and Capstones

This thesis reports the analysis and design of analog front-end circuitry for reading out signals from avalanche photodiodes (APD) or silicon photomultiplier (SiPM) in time-of-flight (ToF) applications. An integrated circuit was designed using AMS SiGe 0.35 um BiCMOS process. The chip measured 2 mm x 2 mm (2000 umx2000 um). The chip mainly contains the following circuits: an APD with photoactive area measuring 24 umx24 um, an SiPM with 8x8 APDs with 236 k ohm quench resistors, a transimpedance amplifier (TIA), a comparator and a R-2R digital to analog converter (DAC). The TIA is based on the shunt-shunt feedback topology. …

Performance-Based Economical Seismic Design Of Multistory Reinforced Concrete Frame Buildings And Reliability Assessment, Chunyu Zhang

UNLV Theses, Dissertations, Professional Papers, and Capstones

As the next generation of seismic design methodology, performance-based seismic design (PBSD) method requires a structure satisfy multiple preselected performance levels under different hazard levels. Optimal PBSD methods provide different strategies to design the numerous variables, including strength, stiffness and ductility of each structural component. The overall goal of this study is to develop a new optimal PBSD method for multi-story RC moment frames. This method is capable of overcoming the deficiencies of existing optimal PBSD methods and can be implemented by the U.S. design practice. The proposed method minimizes construction cost and takes the limit of member plastic rotation …

An Examination Of Perceived Leadership Behaviors And Employee Engagement In The Us Federal Government: An Exploratory Study, Jason Barker

UNLV Theses, Dissertations, Professional Papers, and Capstones

Leadership can exist in any organization or entity. It has been studied extensively and examined comprehensively. There have been various theories of what type of leadership is ideal or suitable for a group or organization. From transformational to transactional leadership, leadership styles exist that can contribute to organizations and the style they employ. Employee engagement can be based on either or both transformational and transactional leadership factors. Transformational leadership behaviors generally show an increase in employee engagement. Employee engagement has an association with job satisfaction and leadership perception. Leadership styles will be defined, in addition to factors in the employee’ …

Combinatorial Ant Optimization And The Flowshop Problem, Tasmin Chowdhury

UNLV Theses, Dissertations, Professional Papers, and Capstones

Researchers have developed efficient techniques, meta-heuristics to solve many Combinatorial Optimization (CO) problems, e.g., Flow shop Scheduling Problem, Travelling Salesman Problem (TSP) since the early 60s of the last century. Ant Colony Optimization (ACO) and its variants were introduced by Dorigo et al. [DBS06] in the early 1990s which is a technique to solve CO problems. In this thesis, we used the ACO technique to find solutions to the classic Flow shop Scheduling Problem and proposed a novel method for solution improvement. Our solution is composed of two phases; in the first phase, we solved TSP using ACO technique which …