Digital Commons Network^™

An Experimental Investigation Of Chemical Mass Transfer Processes In Crystallizing, Hydrous Silicate Magmas: The Genesis Of Ore Deposits And Metasomatic Fluids, Aaron S. Bell

UNLV Theses, Dissertations, Professional Papers, and Capstones

This dissertation is comprised of three broadly related experimental petrology projects on phase equilibria and noble metal solubility in hydrous silicate melts. Chapters two and three combine experimental petrology with high precision laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analysis of experimental run products in order to quantitatively constrain the behavior of the investigated metals. Chapter four presents experimental evidence detailing a novel oxidation mechanism for degassing silicate liquids as well as exploring the geochemical consequences of the proposed mechanism.

Chapter two presents the results of an experimental study on Au, Pt, and Pd behavior in coexisting silicate melt-sulfide-oxide …

Implementation Of The Wiegand Sun Safety Program Into Physicians’ Offices In Southern Nevada, Breanne Eddington

UNLV Theses, Dissertations, Professional Papers, and Capstones

In this study Nevada Cancer Institute’s Wiegand Sun Safety Program was implemented in 14 clinics in Southern Nevada as a pilot run to increase awareness in children and their guardians through educational materials in pediatricians’ and family physicians’ offices. It was hypothesized that the increased display of information regarding sun safety and skin cancer in physicians’ offices would increase patient and guardian awareness of the subject and increase the likelihood of patients and/or guardians asking their physician questions about skin cancer and sun safety, resulting in an increase in preventive actions by guardians to protect their children from damaging rays …

I Am Journalism (And So Can You!): Jon Stewart, Stephen Colbert, And The Role Of The Journalist, Eugene Wagner

UNLV Theses, Dissertations, Professional Papers, and Capstones

Satire news has garnered considerable critical attention, yet the question of just what mainstream journalism might take from it has yet to be asked. This study aims to clarify the normative potential of such alternative discursive approaches. Geoffrey Baym's theory of discursive integration, which argues that once distinct modes of discourse are now blending together, may help explain the relationship between humor and the mediation of current events. This study uses a discourse analysis to compare how mainstream television news outlets and The Daily Show approach truth claims, finding that journalistic credibility suffers, at least in part, from avoiding critical …

Effects Of Social Story Interventions On Preschool Age Children With And Without Disabilities, Cori Michelle More

UNLV Theses, Dissertations, Professional Papers, and Capstones

More children are receiving care outside of their home under the age of six (Childstats.gov, 2007). The quality of these programs has a direct impact on student’s readiness for school (Burchinal, Roberts, Nabors, & Bryant, 1996). Social readiness is the foundation for school readiness and academic achievement (Blair, 2002; Brigman, Lane, Lane, Lawrence, & Switzer, 1999; Raver, 2004). Acquisition of social skills plays a key role in preschool age children’s readiness for school, thus interventions that teach young children social skills are of importance. The purpose of this study was to examine the effects of Social Story interventions on preschool …

Use Of An Animal Model To Explore Prenatal Predictors Of Insulin And Glucose Metabolism In Southwestern Alaskan Yupiit, Julie Jo Kachinski

UNLV Theses, Dissertations, Professional Papers, and Capstones

Compared to other North American indigenous populations, Southwest Alaskan Yupiit exhibit very low rates of type 2 diabetes despite the occurrence of common risk factors. Contemporary Yupiit obtain a substantial portion of their calories from traditional foods, which contain high amounts of omega-3 polyunsaturated fatty acids. Epidemiological and experimental animal research has linked glucose and insulin homeostasis with a diet high in omega-3s. This study used an experimental animal model to explore potential diabetes protective effects (for adult offspring) of prenatal maternal nutrition modeled on traditional locally-obtained Yupiit diets. The results of this study showed that the adult offspring whose …

Emergent Literacy Skills Of Young Children With Autism: A Comparison Of Teacher-Led And Computer-Assisted Instruction, Jason Christopher Travers

UNLV Theses, Dissertations, Professional Papers, and Capstones

Young children with autism often are identified as experiencing problems in language, social, and behavioral development. Current research typically focuses on these three areas with little attention paid to the academic learning of these children. Because of this, young children with autism often do not engage in typical early literacy experiences (e.g.., emergent literacy activities). This can result in these children being at risk for developing poor literacy skills. It is important that researchers begin to explore systematic literacy instruction for young children with autism to not only increase literacy learning, but also facilitate the inclusion of these children in …

A Comparison Of Special Education Teachers’ And Administrators’ Perceptions Of School Climate Factors Leading To Teacher Attrition, Jennifer C. Boeddeker

UNLV Theses, Dissertations, Professional Papers, and Capstones

This study examined (a) the difference between special education teachers’ and administrators’ perceptions of school climate factors that influence special education teacher attrition and (b) differences among the four school climate factors perceived by school personnel. School climate was measured in professional development, collaboration, working conditions, and leadership. Participants were 29 administrators and 62 special education teachers from a large metropolitan school district in the Southwest United States. A 52 item online questionnaire was used for data collection. Special education teachers perceived school climate factors as more influential in promoting teacher attrition than did administrators. When the four school climate …

Oral Cancer In Nevada: A Public Health Perspective, Karl Kingsley

UNLV Theses, Dissertations, Professional Papers, and Capstones

Cancer is the second leading cause of death in the United States, and oral cancer remains the eighth leading cause of cancer death among US males. Although previous epidemiologic studies have found that overall rates of cancer, including oral cancer, have declined in the US in recent decades – these declines are neither uniform nor consistent within this population. Anecdotal evidence has suggested that rates of oral cancer in Nevada are relatively high, although no evidence was available to support these assertions.

Oral Cancer Epidemiology: Based upon this information, a detailed and thorough epidemiologic examination of oral cancer rates in …

Experimental And Numerical Analysis Of Structures With Bolted Joints Subjected To Impact Load, Kumarswamy K. Nakalswamy

UNLV Theses, Dissertations, Professional Papers, and Capstones

The aim of this study is to analyze the transient behavior of structures with bolted joints subjected to impact or shock loads using experimental methods and Finite Element Analysis (FEA). Various factors that affect the response of the bolted joint structures for shock loading were studied, such as damping, preload, intensity of impact load and type of FE modeling. The objective of this work was to develop computational modeling procedures that provide structural analysts an improved physics-based shock model for combat vehicles focusing mainly on shock transmission across bolted joints. There is only a limited amount of published literature describing …

Self-Efficacy And The Predictors For Nclex-Rn® Success For Baccalaureate Nursing Students, Linda Anne Silvestri

UNLV Theses, Dissertations, Professional Papers, and Capstones

The National Council Licensure Examination for Registered Nurses (NCLEX) is the examination that nursing graduates must pass to attain the title of registered nurse and practice professionally. Each year a substantial number of nursing graduates are unable to enter the nursing profession because of failure on the NCLEX. Failure on this examination is a concern, especially since this country desperately needs nurses. Currently, the United States (U.S.) is faced with a nursing shortage. This shortage significantly impacts the U.S. health care system and requires urgent attention so that the health care needs of the people in this country are met. …

The Portrayal Of Schizophrenia In Television: An Experiment Assessing How Viewer Attitudes Are Affected, Lindsey Jo Hand

UNLV Theses, Dissertations, Professional Papers, and Capstones

The media have been found to be the public’s main source of information on mental illness. Schizophrenia is one of the most widely misunderstood, stereotyped and stigmatized mental disorders, and it is no surprise that portrayals of schizophrenia in the media have been found to be very negative in nature. Participants were given a pretest, shown stimulus material, then given a posttest. The pretest and posttest consisted of questions from the Community Attitudes on Mental Illness (CAMI) scale and questions assessing views of dangerousness. Participants viewed an episode of Law and Order: Special Victims Unit in which a man with …

The Effects Of Observation, Dialogue, And Attentional Focus In Dyadic Training Protocol, Carolina Granados

UNLV Theses, Dissertations, Professional Papers, and Capstones

The present study examined the impact that dyad training with an emphasis on attentional focus has on learning in the performance of a golf putt. The participants were randomly divided into four dyad groups: dialogue and observation with external focus, dialogue and observation with internal focus, dialogue and no observation with external focus, and dialogue and no observation with internal focus. Participants were given a set of instructions to verbalize to their partners during practice. These instructions were designed to generate either an internal or an external focus. The results determined that those participants who were instructed to have an …

Illegal Substance Abuse In The Full-Service Restaurant Industry: An Evaluation Of Pre-Employment Drug-Testing, Miranda Kitterlin

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this research is to assess the effect of pre-employment drug-testing policies on employee attitudes and aspects of work performance in the full-service restaurant industry. Specifically, this study attempts to compare the rate of absenteeism, turnover, and work-related accidents and injuries in full-service restaurants with pre-employment drug-testing policies against the aforementioned aspects of work performance in full-service restaurants without pre-employment drug-testing polices. This research also attempts to explore the perceptions, attitudes, and beliefs of full-service restaurant hourly employees and management staff in regards to pre-employment drug-testing policies in the full-service restaurant industry. For the purpose of this study, …

Performance Of Nevada’S Aggregates In Alkali-Aggregate Reactivity Of Portland Cement Concrete, Mohammad Shahidul Islam

UNLV Theses, Dissertations, Professional Papers, and Capstones

Alkali-aggregate reaction (AAR) is a form of distress that occurs in concrete and results in serviceability problems, cracks, spalling, and other deterioration mechanisms. There are two categories of AAR, namely, alkali-silica reaction (ASR) and alkali-carbonate reaction (ACR). Alkali-silica reaction is one of the most recognized deleterious phenomena in concrete, and has been a major concern since its discovery in the 1940s. The reaction which occurs between reactive silica or silicates present in some aggregates and alkalis of Portland cement produces an alkali-silica gel that expands in the presence of moisture resulting in concrete cracks. ACR is also a chemical reaction …

Cluster Analysis Of The Tomal Standardization Sample, Nicholas Shizuo Thaler

UNLV Theses, Dissertations, Professional Papers, and Capstones

Children experience natural cognitive changes as they grow older, with more rapid memory development when they are younger. The purpose of the present study was to investigate the expected normal variation in youth using the Test of Memory and Learning (TOMAL; Reynolds & Bigler, 1994). The TOMAL is a broad-band verbal and nonverbal memory battery that has been standardized on youth aged 5-19, providing a good source of information on memory development in healthy children. Cluster analysis analyzed 1121 children selected from the TOMAL standardization sample and identified homogeneous profile subtypes of memory and learning. In addition, three age ranges …

The Role Of Ecdysone Signaling In Fat-Body Tissue Remodeling And Pupal Metabolism, Nichole Dinell Bond

UNLV Theses, Dissertations, Professional Papers, and Capstones

Holometabolous insects undergo an astonishing transition during their development. During metamorphosis, the larva dramatically changes form and becomes an adult fly. During this process obsolete larval tissues must be eliminated, while tissues required for further development are retained and often remodeled to meet the needs of the adult fly. Tissue remodeling is characterized by morphological changes of the cells in a tissue mass. In many cases, remodeling is characterized by dissociation of the tissue mass, releasing cells to move freely around the body cavity. This process is also common in wound healing and is a key feature of human disease …

The Effect Of Goal Orientation Of Attention, Learning, And Metacognitive Awareness, Ordene V. Edwards

UNLV Theses, Dissertations, Professional Papers, and Capstones

An experimental study was conducted to examine whether achievement goals affect attention, comprehension, and metacognition. One hundred and twenty undergraduate students enrolled in introductory educational psychology classes participated. Students were randomly assigned to one of four goal groups (mastery, performance approach, performance avoidance, or control group) and one of three question groups (emotions, brain, and no questions). The study was conducted in two sessions. First, students were given a reading test, and questionnaires to measure their prior knowledge and personal goals. Second, students read the text on a computer. Then they completed an interest questionnaire, a manipulation check, a post …

A Grounded Theory Approach To Faculty’S Perspective And Patterns Of Online Social Presence, Rebecca A. Cox-Davenport

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this research study was to generate a grounded theory regarding the patterns and perceptions of nursing faculty in the formation of social processes in an online course. Employing a grounded theory approach, this researcher built upon the theoretical concepts of the Community of Inquiry (CoI) model (Garrison, Anderson, & Archer, 2000). The CoI model illustrates the inner workings of the educational experience. The model consists of three main components: social presence, teaching presence, and cognitive presence. These three elements overlap to demonstrate how each factor influences the other forms of presence. This study sought to better understand …

An Exploratory Study On Energy Consumption Of Energy Star And Non-Energy Star Homes, Prajakta Kulkarni

UNLV Theses, Dissertations, Professional Papers, and Capstones

The reduction of energy consumption is one of the economic necessities in the United States due to depleting energy sources in the world. The construction industry is stepping forward to reduce the energy consumption of buildings by efficient designs or by constructing buildings with energy efficient materials and features. In 1992, the U.S. Environmental Protection Agency (EPA) and Department of Energy (DOE) introduced the Energy Star Program to promote energy efficient products with the same or improved services. According to the EPA, Energy Star homes, which use these products, will consume 20 to 30 percent less energy than non-Energy Star …

Characterization Of Plutonium Particles Originating From The Bomarc Accident -1960, Richard Charles Gostic

UNLV Theses, Dissertations, Professional Papers, and Capstones

Within the U.S. arsenal, 32 accidents with nuclear weapons were reported between 1950 and 1980. One of these accidents occurred at McGuire AFB in 1960. A BOMARC missile armed with a nuclear warhead caught on fire and as a result the warhead was destroyed. Sub-millimeter particles consisting of weapons grade plutonium (WGPu) produced by this accident were distributed around the site and remained in the environment for 47 years. Soil cores known to contain WGPu particles produced by this accident were obtained. The particles were localized and removed from the soil with the aid of high resolution computed tomography. The …

Relative Deprivation, Relative Gratification, Status, And Health, Samuel A. Holland

UNLV Theses, Dissertations, Professional Papers, and Capstones

The role of perceived inequity in health was assessed and compared to other social constructs predicted to be relevant in the relationship between inequity and health. Four studies were conducted that demonstrated that a social comparison-based measure of relative deprivation (RD) and relative gratification (RG) can predict health and continues to do so even after accounting for perceived stress, personal income, perceived control, and social participation. A measure of RD/RG was developed that was based on prominent social comparisons and objects of comparison. This measure was reliable and predictive of health in two samplings of different populations. Comparisons of the …

Principal Stress: Working In Conflicting Paradigms From Newtonian To New Science, Shelley Kresyman

UNLV Theses, Dissertations, Professional Papers, and Capstones

Shortages of qualified principal candidates and retention of motivated principals, combined with the evidence that the principal is a vital part of effective school improvement, has ominous implications for the future quality of education. A body of research exists describing school administrators' stress over the last 25 years; yet, limited research reflects the impact the changing role of the principal in the accountability era of No Child Left Behind has had on principal stress and the possible connections to the shifting paradigms in organizational leadership.

If principals perceive themselves to be overstressed and unprepared to meet the current expectations and …

A Comparative Study On Text Categorization, Aditya Chainulu Karamcheti

UNLV Theses, Dissertations, Professional Papers, and Capstones

Automated text categorization is a supervised learning task, defined as assigning category labels to new documents based on likelihood suggested by a training set of labeled documents. Two examples of methodology for text categorizations are Naive Bayes and K-Nearest Neighbor.

In this thesis, we implement two categorization engines based on Naive Bayes and K-Nearest Neighbor methodology. We then compare the effectiveness of these two engines by calculating standard precision and recall for a collection of documents. We will further report on time efficiency of these two engines.

Solace In St. Louis: A Case Study In Heroic Cultural Nostalgia, Amanda J. Pinney

UNLV Theses, Dissertations, Professional Papers, and Capstones

This thesis examines the response of American popular culture to the terrorist attacks of September 11, 2001. By utilizing the September 17, 2001 pre-game ceremony, held at Busch Stadium as a case study example, larger generalizations are made about the role popular culture played in the days following the tragedy. In order to analyze this example, I have developed heroic cultural nostalgia, a framework that combines elements of myth, nostalgia and national identity. Heroic cultural nostalgia provides an explanation of how popular culture plays a role in crisis response. The framework highlights the role of individuals with heroic characteristics in …

Retrofitting Existing Commercial Buildings In The Desert Southwest To Be Energy Efficient, Andrea Lee Wilkins

UNLV Theses, Dissertations, Professional Papers, and Capstones

This research proposes recommendations specific to the desert southwest for retrofitting existing commercial buildings. A dry, arid region such as Las Vegas, Nevada must contend with different ecological concerns than other parts of the United States. The city of Las Vegas sits in a valley in the Mojave Desert of the Southwestern United States and has a population of over 2.5 million inhabitants. The Las Vegas summers are rather hot and frequently exceed 100 degrees F, while the winters are usually mild, about 60-70 degrees F with cool nights. The state of Nevada receives an average of four inches of …

Assessment Of Impacts To Hydroclimatology And River Operations Due To Climate Change Over The Colorado River Basin, William Paul Miller

UNLV Theses, Dissertations, Professional Papers, and Capstones

This dissertation investigated the impacts of climate change to the hydroclimatology and river and reservoir management operations within the Colorado River Basin. Preliminary research indicated observed warming trends throughout the Colorado River Basin and corresponding seasonal trends to the magnitude and timing of runoff in the Colorado River Basin. Subsequent research investigated the changing character of precipitation and corresponding impacts to streamflow over the Colorado River Basin. Analysis of snowpack telemetry (SNOTEL) stations over the American West and Colorado River Basin indicated decreasing trends in annual snowpack, often at least at the 95% confidence interval. A shorter snowpack season was …

Antimicrobial Activity Of D-Lenolate®, Andy Phui

UNLV Theses, Dissertations, Professional Papers, and Capstones

Olive trees are one of the most important fruit trees in the Mediterranean. Although not validated by research, olive leaves are traditionally believed to fight off fever and infections. It has been shown that olive leaf extracts possess antimicrobial activity. Olive leaf extracts contain polyphenols. One of the major phenolic compounds is oleuropein. Oleuropein and other polyphenols have been shown to exhibit antimicrobial activity. East Park Research (EPR) developed an extraction process that they claim does not alter the chemical composition of the olive leaves. The extract is known by the commercial name d-lenolate®. Studies have provided evidence that d-lenolate®, …

Association Of Body Mass Index, Fruit And Vegetable Intake, And Acculturation In A Sample Las Vegas Hispanic Population, Anne L. Bolstad

UNLV Theses, Dissertations, Professional Papers, and Capstones

The U.S. is experiencing a rising prevalence of overweightedness that has been identified as the second leading cause for chronic health conditions threatening public health. Overweightedness has grown disproportionately among ethnic sub-groups. In the fastest going minority population in the U.S., Hispanic Americans are observed with disparately high body mass index, placing them at heightened risk for poor health outcomes. Research suggests five servings of fruit and vegetables, in any combination, provides a sound nutritional base for healthful living and helps to maintain normal body weight.

Americans are known to have poor eating habits while foreign-born populations have well balanced …

Blameworthiness And Dangerousness: An Analysis Of Violent Female Capital Offenders In The United States And China, Courtney Brooke Lahaie

UNLV Theses, Dissertations, Professional Papers, and Capstones

The United States and China represent two of the leading nations that retain the death penalty in both law and practice. Research suggests that judges' sentencing decisions are based primarily on two factors, blameworthiness and dangerousness. Studies involving gender and sentencing in capital punishment cases tend to provide inconsistent findings. The current study uses case narratives to examine the direct and conjunctive effects of various factors on the sentencing decisions of violent female capital offenders in the United States and China. The findings suggest that the concepts of blameworthiness and dangerousness are distinctly defined in the United States and China. …

Ion-Exchange (Ix): Arsenic And Chromium Removal From Brines And Removal Of Inorganic Contaminants By Specialty Resins, Behrang Pakzadeh

UNLV Theses, Dissertations, Professional Papers, and Capstones

Although ion exchange is highly efficient in removing inorganic contaminants, similar to other water treatment technologies, ion exchange has some drawbacks that need to be studied further. Three issues related to drawbacks of ion-exchange resins in water treatment were addressed in this research. The first issue was the influence of anionic inorganic co-contaminants including nitrate, Cr(VI), Se(VI), and As(V) on the performances of nitrate and perchlorate specialty (selective) resins in water treatment. It was found that nitrate can be removed from waters using perchlorate specialty resins, but the resin is poorly regenerated. Perchlorate was not easily removed from either nitrate …