Digital Commons Network^™

Real Time Digital Night Vision Using Nonlinear Contrast Enhancement, Nishikar Sapkota

UNLV Theses, Dissertations, Professional Papers, and Capstones

This thesis describes a nonlinear contrast enhancement technique to implement night vision in digital video. It is based on the global histogram equalization algorithm. First, the effectiveness of global histogram equalization is examined for images taken in low illumination environments in terms of Peak signal to noise ratio (PSNR) and visual inspection of images. Our analysis establishes the existence of an optimum intensity for which histogram equalization yields the best results in terms of output image quality in the context of night vision. Based on this observation, an incremental approach to histogram equalization is developed which gives better results than …

Our Turn: Working Women In The Las Vegas Valley, 1940-1980, Irene B. Scholl Rostine

UNLV Theses, Dissertations, Professional Papers, and Capstones

This thesis describes three types of working women in Las Vegas, NV who performed non traditional women's work and who, through their ingenuity and hard work rose to the top of their fields. The first group of women were the little known women war workers at Basic Magnesium Inc who produced magnesium that was so importanat to the war effort. The second group of women worked in a corporate structure and, hired in entry level positions, were able to break the glass ceiling and rise to positions of managenemt. The third group of women were Realtors in Las Vegas who …

An Analysis Of English Language Learning Instruction Provided In Teacher Education And Inservice Training Programs For General And Special Educators, Lidia E. Sedano

UNLV Theses, Dissertations, Professional Papers, and Capstones

It is essential that English language learners (ELLs) are able to effectively receive an education. Recent national data indicates that the achievement gap between English and non-English learners in school is approximately a two grade-level difference (NCES, 2012). The increase of students who are learning English and who have a disability is a challenge for schools in terms of curricula adjustments, to meet the needs of this population. (Artiles & Ortiz, 2002).

The need to prepare general and special educators to provide appropriate instruction to ELLs is crucial for positive learning outcomes (Shyyan et al., 2008; Youngs & Youngs, 2001). …

Driving Forces: Factors Affecting Police Officer Injuries In Motor Vehicle Incidents In The United States, Carol Servino

UNLV Theses, Dissertations, Professional Papers, and Capstones

Traffic-related incidents were the leading cause of fatal injuries to officers in 14 of 15 years between 1997 and 2012. Vehicle crashes occur at the individual officer level, but chiefs are responsible for agency performance, creating and implementing police policy, and developing organizational culture. This quantitative survey research study draws from organizational culture theory and asks chiefs in state, county, and city police organizations what they believe are salient factors in crashes causing injuries and death to police officers in the United States. Independent variables include safety belt laws, written driving policies (including communication technology commonly used in police vehicles), …

Investigation Of Crashes And Identifying The Best Practices For Setting Up Speed Zones In Towns Along Rural Highways In Nevada, Krishna Prasad Shrestha

UNLV Theses, Dissertations, Professional Papers, and Capstones

In 2010, 51,664 crashes occurred in Nevada. Only about 9% of those crashes occurred in rural areas of the state. However, if only fatal crashes are considered, 41% of those fatal crashes occurred in rural areas. Generally, speed zones are provided in towns along rural highways to reduce speed-related crashes. However, a guideline is necessary for a consistent procedure to setup speed zones throughout the state. The main objectives of this study are to determine factors associated with crashes and to identify the best practices for setting up speed zones in towns along rural highways.

Eleven towns along rural highways …

Soil Moisture Recognition And The Spatial Distribution Of Storm Activity In The Mojave Desert Using High-Resolution Aster And Modis Imagery For Thermophysical Mapping, Russell J. Skuse

UNLV Theses, Dissertations, Professional Papers, and Capstones

Climate models suggest that the Mojave Desert ecoregion is vulnerable to becoming drier in the future, and as the human population grows and development increases, environmental stresses will likely increase. Determining the spatial distribution and variation of soil moisture on a regional scale is an essential component to climate change, hydrologic, and habitat analyses. Soil permeability and sediment stability are characteristics that have been shown to be measurable from remote sensing observations. The primary objective of this project is to map the mechanical composition of the surface materials in the Mojave Desert ecoregion with implications for soil permeability, sediment stability, …

Traffic Modeling In Lagrangian Coordinates Using Smartphone Apps, Sergio Contreras

UNLV Theses, Dissertations, Professional Papers, and Capstones

Traditionally, one of the ways traffic flow has been studied is by using the kinematic wave model. This model is derived in the Eulerian framework by using conservation of the number of vehicles. Recently, the kinematic wave model has been transformed into Lagrangian coordinates. In this framework, the independent variables are unique

vehicles and time. The detailed change in framework, and the properties of the model in the changed framework are reviewed. Numerical results from different traffic cases are explained. Since vehicle trajectory data can be easily collected from smartphones,

a smartphone application is developed for this purpose. This data …

Performance Of Concrete Incorporating Colloidal Nano-Silica, Mohamed Sabry Zeidan

UNLV Theses, Dissertations, Professional Papers, and Capstones

Nanotechnology, as one of the most modern fields of science, has great market potential and economic impact. The need for research in the field of nanotechnology is continuously on the rise. During the last few decades, nanotechnology was developing rapidly into many fields of applied sciences, engineering and industrial applications, especially through studies of physics, chemistry, medicine and fundamental material science. These new developments may be attributed to the fact that material properties and performance can be significantly improved and controlled through nano-scale processes and nano-structures. This research program aims at 1) further understanding the behavior of cementitious materials when …

Evaluation Of Geometric Design Needs Of Freeway Systems Based On Safety And Geometric Data, Eneliko Mujuni Mulokozi

UNLV Theses, Dissertations, Professional Papers, and Capstones

Freeways are arterial highways characterized by high levels of safety and high speed vehicular traffic. Access to and from the freeways is provided through ramps. Geometric elements making up freeway facilities include the roadway, median shoulders, grades, and ramps to and from the traveled way at selected locations, shoulders, radius of curvature, lane width, and speed-change lanes. With the increase of traffic using the freeway systems, there arises more traffic weaving movements within the elements making up the freeway systems. This causes traffic flow to compete at the limited spaces available and reduces safety performance of freeway system.

In studies …

A Comprehensive Research Framework For Geographic Parthenogenesis In Whiptail Lizards (Genus Aspidoscelis), Adam Leland

UNLV Theses, Dissertations, Professional Papers, and Capstones

One of the most compelling topics in biology has been the ubiquity of sexual reproduction in living organisms. Because the ecological and evolutionary advantages of sex are well founded, those organisms that reproduce asexually remain enigmatic. Parthenogenesis, the clonal reproduction of an all-female species without the need for males, is a relatively common form of asexual reproduction in vertebrates, and has been subject of numerous academic investigations. Many parthenogenic organisms also share aspects of their geographic distributions, such as inhabiting higher latitudes, higher altitudes, islands or island-like habitats, xeric environments, and marginal, disturbed or ecotonal habitats relative to their sexual …

Plasma Test On Industrial Diamond Powder In Hydrogen And Air For Fracture Strength Study, Rohit Asuri Sudharshana Asuri Sudharshana Chary

UNLV Theses, Dissertations, Professional Papers, and Capstones

Diamonds are the most precious material all over the world. Ever since their discovery, the desire for natural diamonds has been great; recently, the demand has steeply increased, leading to scarcity. For example, in 2010, diamonds worth $50 billion were marketed. This increased demand has led to discovering alternative sources to replace diamonds. The diamond, being the hardest material on earth, could be replaced with no other material except another diamond. Thus, the industrial or synthetic diamond was invented. Because of extreme hardness is one of diamond's properties, diamonds are used in cutting operations. The fracture strength of diamond is …

Restoration Of Biological Soil Crust On Disturbed Gypsiferous Soils In Lake Mead National Recreation Area, Eastern Mojave Desert, Lindsay P. Chiquoine

UNLV Theses, Dissertations, Professional Papers, and Capstones

Biological soil crusts (BSCs) are sensitive to anthropogenic disturbances. Natural recovery takes many years. Active restoration decreases recovery time. Native BSC inocula, which included lichens and mosses, salvaged from gypsiferous soil habitats in Lake Mead National Recreation Area (LMNRA) in the eastern Mojave Desert were stored dry for two years and applied to disturbed soil after a road reconstruction in LMNRA and also used in laboratory experiments to test inoculation technique effectiveness. After 18 months, field results revealed positive relationships between inoculation and the presence of macroscopic BSC cover, cyanobacteria abundance, soil stability, and ammonium concentrations. Chlorophyll fluorescence monitoring of …

A Gauge Theoretic Treatment Of Rovibrational Motion In Diatoms, Gregory Colarch

UNLV Theses, Dissertations, Professional Papers, and Capstones

The Born-Oppenheimer approximation has long been the standard approach to solving the Schrödinger equation for diatomic molecules. In it, nuclear and electronic motions are separated into "slow" and "fast" degrees of freedom and couplings between the two are ignored. The neglect of non-adiabatic couplings leads to an incomplete description of diatomic motion, and in a more refined approach, non-adiabatic couplings are uncoupled by transforming the angular momentum of the molecule and electrons into the body-fixed frame.

In this thesis we examine a "modern" form of the Born-Oppenheimer approximation by exploiting a gauge theoretic approach in a description of molecular motion. …

Elemental Contributions From Minor And Major Constituents Of Bone On The Separation Of Radiostrontium, Ashlee Rae Dailey

UNLV Theses, Dissertations, Professional Papers, and Capstones

While many methods exist to separate and analyze radionuclides from a variety of environmental matrices, the performance of all of these methods is often limited by other interfering constituents that are consistently found in most of these samples. The presence of such constituents can significantly reduce the recovery of the radioisotopes of interests and lead to incomplete separations.

Strontium has the same oxidation state and a similar atomic radius as calcium and is therefore readily able to substitute for calcium in lattice sites. This similarity in behavior leads to the preferential accumulation of strontium in newly formed bone. The study …

Morphological Features Of The Proximal Femur: Investigations Of Habitual Activities, Sex And Health In A Bronze Age Population From The Arabian Peninsula, Animikha Dutt

UNLV Theses, Dissertations, Professional Papers, and Capstones

Bronze Age sites on the Arabian Peninsula are relatively rare. The undisturbed nature of Tell Abraq, located in the United Arab Emirates, is significant since it represents one of the longest known occupied settlement sites dating from the 3rd millennium BC to the 1st century AD. This site has revealed an undisturbed communal tomb that was used for approximately 200 years (2200-2000 BC), housing commingled and disarticulated human remains of at least 286 adults and 127 subadults. The strategic coastal position of Tell Abraq, at the intersection of several major cultural centers, allowed its people to actively participate in world …

The Retention And Success Of Alternatively Admitted Student Athletes: A Case Study Of The Unlv Athletic Department, Adrienne Ekas-Mueting

UNLV Theses, Dissertations, Professional Papers, and Capstones

The aim of this exploratory study is to determine why student athletes admitted under University of Nevada, Las Vegas's (UNLV) alterative-admissions policy are successful, specifically by looking at the UNLV Athletic Department's institutional practices. Alternatively admitted athletes are the recipients of these practices. Although there is some research on the predictors of success for college-student athletes, the literature on alternatively admitted student-athlete success is negligible. This appears to be a specialty subgroup of students, and the institutional practices that contribute to their success should be identified and explored.

The purpose of this study was to qualitatively investigate and analyze whether …

The Motivating Language Of Principals: A Sequential Transformative Strategy, William Tobias Holmes

UNLV Theses, Dissertations, Professional Papers, and Capstones

This study implemented a Sequential Transformative Mixed Methods design with teachers (as recipients) and principals (to give voice) in the examination of principal talk in two different school accountability contexts (Continuously Improving and Continuously Zigzag) using the conceptual framework of Motivating Language Theory. In phase one, teachers were surveyed using the ML Toolbox. The survey was administered using the Dillman Tailored Design Method, and the return rate was 67.48%. The major findings that emerged were: (a) significant differences in Motivating Language (ML), Direction-Giving Language (DG), Empathetic Language (E), and Communication Competence (CC) variables between the Continuously Improving and Zigzag Clusters; …

An Estimate Of Groundwater Recharge In The Nabogo River Basin, Ghana Using Water Table Fluctuation Method And Chloride Mass Balance, Melanie Lynn Krautstrunk

UNLV Theses, Dissertations, Professional Papers, and Capstones

The Cambrian-Precambrian fractured sandstone aquifer in the Nabogo River Basin in the Sahelian Northern Region in Ghana is one of the most important sources for fresh water supply for the local rural communities there. Recent population growth and commercial agricultural interests in this region could have an impact on this critical water resource. Groundwater recharge estimates are determined in this study using the Water Table Fluctuation Method and Chloride Mass Balance and can be applied to future sustainability studies of the region's water resources. Recharge estimates of the Water Table Fluctuation Method are in a range of 10-143 mm/yr or …

Facing The Music: Student Power Relations In Student Leadership Within High School Band Programs, Curtis James Melton

UNLV Theses, Dissertations, Professional Papers, and Capstones

Bullying among children in our nation's schools has gripped the nation's collective interest, leading to grief, anger, and inquisition. Recent headlines suggest that the public is asking why bullying is taking place among our youth, so much so that it is costing children their lives. Recent teen deaths have swept the airwaves and headlines in the last two to three years, and it appears to be a problem that is starting to become a national epidemic.

The purpose of this study was to examine bullying within student-sanctioned programs within a school, specifically, whether or not student leaders in those programs …

Evaluating The Impact Of A New Casino Loyalty Program On Gaming Volume, Ji Hye Min

UNLV Theses, Dissertations, Professional Papers, and Capstones

Using two years secondary data gathered from a Las Vegas hotel and casino, the effectiveness of a new casino loyalty program is examined on both daily slot coin-in and table game drop. Based on a theoretical model advanced to estimate the effects of a new loyalty program, simultaneous multiple regression analysis with Autoregressive Moving Average (ARMA) terms is used to analyze the data. The results indicate that the loyalty variable significantly increases slot coin-in at a rate of $302,455 per day, while table game drop is not significantly affected by the introduction of the new loyalty program. The coin-in increase …

The Abundance And Distribution Pattern Of Quagga Mussels In The Las Vegas Bay Of Lake Mead, Nevada And Potential Correlation With Environmental Parameters, Scott Rainville

UNLV Theses, Dissertations, Professional Papers, and Capstones

The non-native quagga mussel [Dreissena bugensis (Andrusov, 1897)] was initially discovered in Boulder Basin of Lake Mead, Nevada-Arizona on January 6, 2007. This occurrence marked the first biological invasion of dreissenid mussels in the Western U.S., following a significant North American range expansion of invasive quagga mussels from populations that invaded and colonized the Great Lakes Region in the Northeastern U.S. during 1991. This nonindigenous mollusk species quickly spread from Boulder Basin and became established throughout the entire reservoir by the end of 2007, with the exception of the inner Las Vegas Bay. There was an apparent absence of settled …

Couples' Process Of Healing From Infidelity While In Therapy, Jordan Mark Staples

UNLV Theses, Dissertations, Professional Papers, and Capstones

Infidelity is one of the most common presenting problems for couples and marriage therapists. It is widely acknowledged to be a destructive phenomenon for a couple's relationship and is one of the most difficult presenting problems to treat. Treatment models for infidelity vary and have little empirical testing. The purpose of the proposed study was to investigate the client's perspective of the process for healing from infidelity. Additionally, the proposed study looked to qualitatively assess and amalgamate participants' experience of the healing process for infidelity. Themes and relationships among these themes were identified using open, axial, and selective coding processes. …

Topics In Galaxy Formation: Pairwise Velocities Of Dark Matter Halos And Molecular Hydrogen Regulated Star Formation In Cosmological Simulations, Robert Jo Thompson

UNLV Theses, Dissertations, Professional Papers, and Capstones

In this dissertation we investigate two distinct challenges within the concordance LCDM model and an unrelated project.

The first is a discrepancy between theory and observation. A massive galaxy sub-cluster known as the `bullet' has fallen through a more massive parent galaxy cluster at a redshift of z=0.296.

Theory finds that in order to reproduce the observational quantities of this cluster, an unusually high relative velocity of v12=3000 km/s between the two cluster's parent halos is required.

We quantify the statistical probability of producing a `bullet-like' halo pair within large N-body simulations, and

conclude that either the LCDM model is …

Molecular Processes In Astrophysics: Calculations Of H + H2 Excitation, De-Excitation, And Cooling, Matthew Kelley

UNLV Theses, Dissertations, Professional Papers, and Capstones

The implications of H+H2 cooling in astrophysics is important to several applications. One of the most significant and pure applications is its role in cooling in the early universe. Other applications would include molecular dynamics in nebulae and their collapse into stars and astrophysical shocks. Shortly after the big bang, the universe was a hot primordial gas of photons, electrons, and nuclei among other ingredients. By far the most dominant nuclei in the early universe was hydrogen. In fact, in the early universe the matter density was 90 percent hydrogen and only 10 percent helium with small amounts of lithium …

Hybrid Plasmonic Nanoantennas: Fabrication, Characterization, And Application, Shengjie Zhai

UNLV Theses, Dissertations, Professional Papers, and Capstones

As optical counterpart of microwave antennas, plasmonic nanoantennas are important nanoscale devices for converting propagating optical radiation into confined/enhanced electromagnetic fields. Presently, nanoantennas, with a typical size of 200-500 nm, have found their applications in bio-sensing, bio-imaging, energy harvesting, and disease cure and prevention. With the device feature size of next generation IC goes down to 22 nm or smaller, and biological/chemical sensing reaches the Gene’s level, the sizes of the corresponding nanoantennas have to be scaled down to sub-100nm level. In the literature, these sub-100nm nanoantennas are referred as deep subwavelength nanoantennas as size of such miniaturized nanoantennas is …

The Initial Development Of Child-Focused Interventions In The Treatment Of Maternal Substance Abuse And Child Neglect, Kendra Tracy

UNLV Theses, Dissertations, Professional Papers, and Capstones

This single case study focuses on the development and evaluation of child focused interventions for the treatment of child neglect and concurrent maternal substance abuse that were incorporated into Family Behavior Therapy (FBT). The participants were a mother referred by the Department of Family Services and her child. The child participated in three child focused interventions that were developed to decrease child behavior problems, increase support and communication, and prevent future neglect by strengthening the mother & child relationship. Although not a focus in this study, the mother participated in traditional FBT adult focused intervention components. The chief aim of …

Impact Of The 2003 Illinois Gaming Tax Rate Increase On Marketing Spending And Cross-State Substitution, Mikael Bengt Ahlgren

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this research was to investigate three potential consequences related to the 2003 Illinois Gaming Tax rate restructuring. The first section presents the assessment of whether a higher tax rate motivated an Illinois casino operator to reduce of marketing/promotional expenditures in an attempt to negatively influence revenues. The second establishes if the surrounding state gaming operators reacted to the increased Gaming Tax rate in Illinois, by raising their marketing spending. The last section clarifies whether the changes to the Illinois Gaming Tax Schedule impacted gaming volumes in the neighboring/competing states of Indiana, Iowa, and Missouri.

The analysis relied …

Where In The World Are The Women Of Time? Women And The "Person Of The Year" Covers For Time Magazine, Krystle Lynne Anttonelli

UNLV Theses, Dissertations, Professional Papers, and Capstones

Through a content analysis of Time magazine's "Person of the Year" issue, formerly titled "Man of the Year," this thesis examines how the news magazine has reevaluated and revised the once gender suggestive title to a more inclusive title in correlation to the portrayal of women featured on the covers from both past and present. This thesis also provides background on the feminist theory in order to put into perspective the professional and intellectual growth of women throughout the decades. The supporting literature contextualizes the findings with reference to other mainstream magazines and the portrayal of women versus men featured …

Shock Attenuation In Landing, Bryon Christopher Applequist

UNLV Theses, Dissertations, Professional Papers, and Capstones

Shock attenuation (SA) has been well studied in activities such as walking and running (Chu, et al. 2004; Derrick, et al. 2004; Mercer, et al. 2003); however, there is a lack of research regarding SA during landing. Furthermore, there is lack of information regarding which structures attenuate shock. The purpose of this study was to examine SA among the leg-hip, hip-head, and leg-head segments during landing. Each subject (n=10, Age 26.3 ± 2.71 years, Height 1.68 ± 0.08 m, Mass 70.49 ± 16.03 kg) was instrumented with accelerometers at the leg, hip and forehead. Subjects then performed landings from three …

Self-Image Congruence With Communication Channels And Its Impact On Reward Program Loyalty, Orie Berezan

UNLV Theses, Dissertations, Professional Papers, and Capstones

Loyalty programs have become products in and of themselves. They need to maintain member loyalty in order to survive. It is proposed that communication has a larger impact on program loyalty than previously thought. This study utilizes structural equation modeling (SEM) to evaluate the influence of communication typologies and dimensions on hotel reward program loyalty via self-image congruence, service quality, satisfaction, and trust. Moreover, this dissertation presents a communication identity model, which focuses on promoting hotel reward program loyalty via self-congruence with communication channels.

Newly discovered significant paths were found between: communication style and self-congruence with communication channels; self-congruence with …