Digital Commons Network^™

Holding Hands And Drying Tears: Effectiveness Of Student Employees In Promoting A Successful Lms Implementation, Cary Ann Johnson

Theses and Dissertations

Two-thirds of higher education institutions are either currently involved in the process of or will soon begin to review their learning management system strategy (Green, 2012). Transitioning from one LMS to another is an endeavor that utilizes the entire institution and requires a great deal of strategic planning and cooperation. The literature described the involvement of instructional designers and technology support as key players in this transition process over a period of parallel time. When BYU transitioned from Blackboard to Learning Suite, a team of student employees managed the majority of the change. While there was very little time when …

Analysis, Validation, And Improvement Of High-Resolution Wind Estimates From The Advanced Scatterometer (Ascat), Jeffrey Richard Blodgett

Theses and Dissertations

The standard L2B ocean wind product from the Advanced Scatterometer (ASCAT) is retrieved as a 25 km product on a 12.5 km grid. Ultra-high resolution (UHR) processing allows ASCAT wind retrieval on a high-resolution 1.25 km grid. Ideally, such a high-resolution sample grid provides wind information down to a 2.5 km scale, allowing better analysis of winds with high spatial variability such as those in near-coastal regions and storms. Though the wind field is sampled on a finer grid, the actual data resolution needs to be validated. This thesis provides an analysis and validation of ASCAT UHR wind estimates in …

Magnetic Holding Of Synthetic Quartz For Precision Grinding, Saudin Basic

Theses and Dissertations

The objective of this research work is to investigate the practicality of magnetic workholding of non-magnetic synthetic quartz during high-speed grinding. This research work is sponsored by Quartzdyne and will be used as the starting point to applying single-piece rounding of its quartz. Hypotheses were created that would permit the authors to conclude that magnets are in fact worthwhile workholders for non-magnetic materials. Designs of Experiments were used to reject or fail to reject the null hypotheses. Experiments were carried out using a custom HAAS lathe, modified into a grinding center with an NSK live spindle, and neodymium-iron-boron magnets used …

Studies Of Phou In Escherichia Coli: Metal Binding, Dimerization,Protein/Protein Interactions, And A Signaling Complex Model, Stewart G. Gardner

Theses and Dissertations

Phosphate is an essential nutrient for all forms of life. Escherichia coli has a PhoR/PhoB two component regulatory system that controls the expression of various genes whose products allow the cell to thrive in low phosphate environments. The signaling mechanism of the PhoR/PhoB system has been studied and the phosphorylation cascade that controls gene expression is well understood. What is still unknown is how PhoR senses the phosphate level of the environment. The PstS, PstC, PstA, PstB, and PhoU proteins play a role in this signal sensing. This work confirms the hypothesis that the PstSCAB complex senses the environmental phosphate …

A Randomized Controlled Trial To Study The Effects Of Breakfast On Energy Intake, Physical Activity, And Body Fat In Women, Gabrielle Marie Lecheminant

Theses and Dissertations

PURPOSE: The purpose of this study was to determine the effects of eating breakfast on energy intake, physical activity, body weight, and body fat in women who were nonhabitual breakfast eaters over a one-month period. METHODS: We tested 49 premenopausal, nonhabitual breakfast-eating women to compare the effects of eating breakfast versus not eating breakfast. Each participant was randomized to one of two conditions: breakfast or no breakfast. Breakfast eaters were required to eat within an hour and a half of awakening and had to be finished eating their breakfast meal by 8:30 A.M. Non-breakfast eaters were defined as not consuming …

The Effectiveness Of Computer-Enhanced Shadowing And Tracking Pronunciation Exercises For Intermediate Level Foreign Language Learners, Veronique Willardson

Theses and Dissertations

This study examines the effectiveness of on-line video-assisted pronunciation exercises in beginning level classes of foreign-language learning. A review of the current literature on pronunciation is presented, followed by a description of a study used to test the effectiveness of computer-based exercises in improving pronunciation. The participants were a group of high school students that were members of a fourth year French class. As part of their regular class time, the students participated in two types of exercises, in-class group work and computer-lab self-directed exercises, in which the students watched videos with subtitles while repeating what they heard. Satisfaction with …

Cost Effectiveness Of Treating Generalized Anxiety Disorder In Adolescence: A Comparison By Provider Type And Therapy Modality, Kathryn Evelyn Reynolds

Theses and Dissertations

Generalized anxiety disorder (GAD) is frequently found in primary care settings and is highly prevalent among adolescents. The purpose of this study was to examine the cost effectiveness by provider type and therapy modality in treating adolescents (ages 13-17) with a GAD diagnosis (DSM-IV 300.02). A national insurance company in the United States provided outpatient and unidentifiable data for adolescent GAD cases (n = 2,932). These cases were used to analyze the cost effectiveness, total cost, treatment length, dropout, and readmission rates for the treatment of adolescents with GAD. Descriptive statistics signify that the mean cost of treatment for GAD …

B1 Mapping For Magnetic Resonance Imaging, Daniel Joseph Park

Theses and Dissertations

Magnetic Resonance Imaging (MRI) is a non-ionizing form of medical imaging which has practical uses in diagnosing, characterizing, and studying diseases in vivo. Current clinical practice utilizes a highly trained radiologist to view MR images and qualitatively diagnose, characterize, or study a disease. There is no easy way to compare qualitative data. That is why developing quantitative measures in MRI show promise. Quantitative measures of disease can be compared across a population, MRI sites, and over time. Osteoarthritis is one disease where those who have it may benefit from the development of quantitative MRI measures. Those benefits may include earlier …

Variation In Resource Utilization And Cost Of Reproduction For Two Burying Beetle Species, Peter J. Meyers

Theses and Dissertations

The cost of reproduction hypothesis suggests that allocation into current reproduction constrains future reproduction. How organisms accrue reproductive costs may differ between species and with varying levels of resource quality. Burying beetles are model organisms for testing for the cost of reproduction because of their unique natural history; beetles utilize small vertebrate carcasses for reproduction and they and their offspring feed exclusively on these discrete resources. Burying beetles also can utilize a large range of carcass sizes for reproduction. We tested for the cost of reproduction in two species of burying beetles, Nicrophorus marginatus and Nicrophorus guttula found in Central …

Alcohol Modulation Of Dopamine Release, Nathan Dan Schilaty

Theses and Dissertations

The mesolimbic dopamine (DA) system projects from the ventral tegmental area (VTA) to structures associated with the limbic system, primarily the nucleus accumbens (NAc). This system has been implicated in the rewarding effects of drugs of abuse. Many drugs of abuse act in the VTA, the NAc, or both. Dopamine neurons in the VTA that project to the NAc, and the GABA neurons that inhibit DA neurons locally in the VTA or project to the NAc, play an important role in mediating addiction to various drugs of abuse, in particular alcohol. There is a growing body of evidence of co-dependence …

A Competency Model For Catering And Event Professionals Using A Modified Delphi Technique, Donnell G. Bayot

UNLV Theses, Dissertations, Professional Papers, and Capstones

As the market for face-to-face meetings and events has grown to one of the largest private sector industries, so has the market for catering, which is the largest budget line item for a meeting or event. Clients have become more demanding and at the same time more price-conscious. This has caused catering professionals and meeting and event planners' job responsibilities to change. Caterers and planners now have more crossover responsibilities and over more varied functional areas than ever before. In response, the National Association for Catering and Events (NACE), as the oldest and largest catering association in the world, formally …

Designing A Process To Reliably Split Extracted Teeth To Access The Dental Root Canal, Happy Singh Ghag

UNLV Theses, Dissertations, Professional Papers, and Capstones

Introduction

Mesenchymal stem cell (MSC) research is a contemporary topic in modern healthcare. These cells have the ability to divide and generate progeny, which then become committed to specific and distinctive end-stage phenotypes, such as cartilage or bone (Caplan 1991). MSCs have been isolated from a variety of tissues such as the umbilical cord, bone marrow, adipose tissue (Ding, Shyu & Lin 2011) and dental pulp (Takeda et al 2008). Although dental pulp is a viable source for MSCs, peer reviewed research has given limited attention to its retrieval process through intentional tooth splitting of extracted teeth. The purpose of …

Novel Deployment Of Elpasolites As A Dual Neutron / Gamma-Ray Directional Detector, Amber Lynn Guckes

UNLV Theses, Dissertations, Professional Papers, and Capstones

At a time when upholding national security has never been more important, there exists a need for the advancement of radiation detection technologies. Neutron and photon detectors are essential to fulfilling mission areas including detection and localization of missing, stolen or smuggled radiological or nuclear materials, quantification of the effects of a radiological or nuclear event, and supporting nonproliferation efforts. The aim of this study was to evaluate a new radiation detector based on the scintillation elpasolite compound Cs2LiYCl6:Ce (CLYC) for simultaneous measurements of neutron and photon flux and the localization of radiation sources. Previous studies performed on the CLYC …

Factors Associated With Rapid Readmission Among Nevada State Pyschiatric Hospital Patients, Christopher Owen Moore

UNLV Theses, Dissertations, Professional Papers, and Capstones

Rapid readmission (RR) of psychiatric patients within 30 days of discharge places a costly burden on state psychiatric facilities and may be an indicator of suboptimal service provision. Several studies have previously considered RR to inpatient facilities, but there is a lack of information available about the variables associated with RR of psychiatric patients to state-operated inpatient facilities in Nevada. This study attempts to identify factors associated with RR at a southern Nevada state psychiatric hospital. Participants included 7,177 patients admitted between May 1, 2012 and April 30, 2014. All 12,068 admissions, including 2,220 RR, were reviewed, and rapid readmits …

Empirical Studies On Interest Rate Derivatives, Xudong Sun

UNLV Theses, Dissertations, Professional Papers, and Capstones

Interest rate models are the building blocks of financial market and the interest rate derivatives market is the largest derivatives market in the world. In this dissertation, we shall focus on numerical pricing of interest rate derivatives, estimating model parameters by Kalman filter, and studying various models empirically. We shall propose a front-fixing finite element method to price the American put option under the quadratic term structure framework and compare it with a trinomial tree method and common finite element method. Numerical test results show the superiority of our front-fixing finite element method in the aspects of computing the option …

Systemic Transformation For College And Career Readiness And Enhanced Social Return On Investment, David F. Lewis

Dissertations

The transition in motion in the nation and in Florida has the potential to have a short-term adverse impact on high school graduation rates. The transition to more rigorous Florida Standards and their accompanying assessments are expected to promote improved college and career readiness and graduation rates for students in the long term. The disruptive consequences of the transition presents a scenario of short term losses sparking a sense of urgency among educators, parents, students, and the community at-large. This sense of urgency serves as the catalyst for the transformational change initiatives outlined in this document. This Change Leadership Project …

The Effect Of Hearing Impairment On Word Processing Of Infant- And Adult-Directed Speech, Velma Sue Robertson

Theses and Dissertations (ETD)

Objective. Little is known about how children with hearing loss (CHL) process words. The Emergent Coalition Model (ECM) of early word learning proposes that multiple cues (e.g., perceptual, social, linguistic) are used to facilitate word learning. Because hearing loss influences speech perception, different word learning patterns may emerge in CHL relative to children with normal hearing (CNH). One perceptual cue used by young children to access word learning is infant-directed-speech (IDS). Specifically, twenty-one month-olds can learn words in IDS but not in adult directed speech (ADS); however, by 27 months children can learn words in ADS. Currently, it is unknown …

Nutrition Knowledge Of High School Senior Students In Northwest Arkansas, Grace Heymsfield

General Human Environmental Sciences Undergraduate Honors Theses

Numerous changes in school environment regarding nutrition have been implemented in Arkansas, but there is no means in place of testing nutrition curriculum effectiveness in terms of nutrition knowledge of students. High school senior students completed a validated nutrition knowledge survey regarding the Dietary Guidelines for Americans 2010. Further testing with a larger sample size is recommended.

The Association Of Individual And Neighborhood Social Cohesion, Stressors, And Crime On Smoking Status Among African-American Women In Southeastern Us Subsidized Housing Neighborhoods, Jeannette O. Andrews, Martina Mueller, Susan D. Newman, Gayenell Magwood Phd, Rn, Faha, Faan, Jasjit S. Ahluwalia, Kellee White, Martha S. Tingen

Publications

The purpose of this study was to examine the associations between individual and neighborhood social contextual factors and smoking prevalence among African-American women in subsidized neighborhoods. We randomly sampled 663 adult women in 17 subsidized neighborhoods in two Southeastern US states. The smoking prevalence among participants was 37.6%, with an estimated neighborhood household prevalence ranging from 30 to 68%. Smokers were more likely to be older, have lower incomes, have lower BMI, and live with other smokers. Women with high social cohesion were less likely to smoke, although living in neighborhoods with higher social cohesion was not associated with smoking …

Stereological Studies Of The Effects Of Sodium Benzoate Or Ascorbic Acid On Rats’ Cerebellum, Ali Noorafshan, Mahboobeh Erfanizadeh, Saied Karbalay-Doust

Saudi Medical Journal

OBJECTIVES: To evaluate the cerebellar structure in sodium benzoate (NaB) or ascorbic acid (AA) treated rats. METHODS: This experimental study was conducted between May and September 2013 in the Laboratory Animal Center of Shiraz University of Medical Sciences, Shiraz, Iran. The rats received distilled either water, NaB (200mg/kg/day), AA (100mg/kg/day), or NaB+AA. The hemispheres were removed after 28 days and underwent quantitative study. RESULTS: The total volume of the cerebellar hemisphere, its cortex, intracerebellar nuclei; the total number of the Purkinje, Bergman, granule, neurons, and glial cells of the molecular layer; and neurons and glial cells of the intracerebellar nuclei …

Are The Current Methods Of Remediation To Reduce Nitrate Contamination In Groundwater In The Developing World Effective? A Systematic Review, Jessica Nadin

The Plymouth Student Scientist

Nitrate contamination of groundwater has become a growing problem, particularly in the developing world as a result of agricultural intensification and rapid urbanisation leading to leaching and run off. Large numbers of people depend on groundwater for drinking and ingestion of nitrate contaminated waters can lead to methaemoglobinemia and cancers. This review examines biological, chemical and physical methods currently employed to remove nitrate contamination from groundwater. Review of these methods is achieved by extensive literature searching and utilisation of inclusion criteria and quality assessments to obtain relevant results. The review found that all of the methods examined are effective. Effectiveness …

Opinion: Overfishing And The Replacement Of Demersal Finfish By Shellfish: An Example From The English Channel, Carlotta Molfese, Doug Beare, Jason M. Hall-Spencer

The Plymouth Student Scientist

The worldwide depletion and collapse of major fish stocks through intensive industrial fishing has raised many concerns about the sustainability of current fishing practices and the effectiveness of existing management measures (Christensen et al., 2003; Baum and Worm, 2009; O’Leary et al., 2011). Long-term data series such as fishery statistics have been analysed extensively in recent decades to assess changes in fish populations and ecological communities (Pauly et al., 2001; Pinnegar et al. 2002; Pauly and Chuenpagdee, 2003). Since Pauly et al.’s (1998) pioneering work, the phenomenon of “Fishing Down Marine Food Webs” has been investigated worldwide. The trend for …

Academic Optimism In Middle Schools: A Study Of Factors That Appear To Contribute To Its Development, Zachary A. Best

Masters Theses and Doctoral Dissertations

The need to increase student academic achievement has been established and well-documented in the literature. With a heightened focus on accountability measures, school personnel are under significant pressure to find ways to increase student achievement. Research suggests that academic emphasis, collective teacher efficacy, and faculty trust in students and teachers actually work in concert and form a newly-identified construct – academic optimism – that has been shown to have a positive relationship with student achievement. The purpose of this study was to determine those factors that may be present in middle schools with high levels of academic optimism. Ten middle …

Impact Of Advanced Placement Student Selection Models On Academic Achievement And Stakeholder Perceptions Of Program Effectiveness, Ryan E. Bandy

Masters Theses and Doctoral Dissertations

This research study was designed to examine the relationship between the use of open and closed student selection systems for the enrollment of students in Advanced Placement (AP) educational services at the high school level and student academic achievement. The quantitative portion of this study examined the relationship between the use of a particular student selection system and stakeholder perceptions of a school’s educational environment, while the qualitative portion examined the stakeholder perceptions of student selection systems. In order to accomplish these goals student scores on AP examinations from the 2010-2011, 2011-2012, and 2012-2013 academic school years were collected from …

A Comparative Analysis Of Instructional Techniques Toward Long-Term Positive Ergonomics Transformation For The Early Career Sonographer, Jody L. Hancock

Masters Theses and Doctoral Dissertations

The past two decades have demonstrated sonographer work-related musculoskeletal disorder (WRMSD) rates between 80.0 to 90.4%. A surprising revelation made by sonographers was that educators were not perceived as the primary providers of ergonomics instruction. For these reasons, a mixed methods study was performed, involving a causal-comparative component with a longitudinal perspective, a quasi-experimental element, and limited observations and interviews. The study followed four years of sonography graduates through the early career scan period, comparing transmissional, transactional, and transformational learning results. The study’s goal was to determine whether transformative ergonomics learning in a collaborative and reflective environment could demonstrate a …

The Relationship Between Freshmen Student Retention And Use Of An Online Parent Portal, Brandy Mallory Cartmell

Masters Theses and Doctoral Dissertations

Bachelor degree attainment in Tennessee is lower than the national average, which can have a dramatic impact on the quality of life for Tennesseans. Postsecondary institutions have been tasked with increasing the number of students who graduate, and this begins with retention of students. Retention of first-year students is a puzzle for institutions, however, the importance of retention cannot be minimized. The University of Tennessee at Martin has implemented an online Parent Portal to intentionally support the assistance of parents in increasing student success and retention. A stratified random sample of 300 freshman-level students who began during the 2012-2013 academic …

Using Network Clustering To Predict Copy Number Variations Associated With Health Disparities, Yi Jiang

Masters Theses and Doctoral Dissertations

Substantial health disparities exist between African Americans and Caucasians in the United States. Copy number variations (CNVs) are one form of human genetic variations that have been linked with complex diseases and often occur at different frequencies among African Americans and Caucasian populations. In this study, we aimed to investigate whether CNVs with differential population frequencies can contribute to health disparities from the perspective of gene networks. We inferred network clusters from two different human gene/protein networks. We then evaluated each network cluster for the occurrences of known pathogenic genes and genes located in CNVs with different population frequencies, and …

The Impact Of Participation In Online Social Networking On Parenting Stress Levels Of Single Mothers, Djuana A. Tomlin

Masters Theses and Doctoral Dissertations

The U.S. Census Bureau (2012) estimated that there were 15.2 million female householders with no husband present. Many single mothers experience a high level of stress due to feelings of isolation and alienation from friends and family and having to deal with social, economic, and personal issues alone. This study evaluated the impact of participation in a social network site (SNS) on the stress levels of single mothers for the purpose of using updated resources to replicate and expand upon the initial work of Dunham et al. (1998). This study sought to answer the following research questions: Does participation in …

Mystical Experience As Predictor Of Domains Of Religious And Spiritual Self Identification: Empirical And Theoretical Considerations, Sara E. Hall-Mckane

Masters Theses and Doctoral Dissertations

The concept of spirituality has emerged as a major focal point in both the theoretical and empirical study of religion. Whether the emergence of spirituality is a dimension of religion or a separate and distinct construct has been the subject of much debate among scholars. The philosophical arguments proposed on either side have underscored the need for further research into just what spirituality is and is not. An ongoing transition from a more religious to a more spiritual self identification is evident at least in the United States (Roof & Greer, 1993, 1999; Pargament, 1999). Using the data collected from …

A Causal Comparative Investigation Into Transactional Versus Transformational Instructional Delivery Style In Two Freshman-Level Humanities Courses At A Southeastern American University, Michael J. Jaynes

Masters Theses and Doctoral Dissertations

The purpose of the study was to utilize a causal comparative approach to compare two contrasting instructional delivery styles to determine if there was any difference in final grade outcome between students whose instructors used transactional instructional delivery techniques and students whose instructors used transformational instructional delivery techniques in two lower division undergraduate humanities courses at a southeastern university. A secondary purpose of the study was to investigate the relationship between instructional delivery style and student perception of teacher effectiveness. The primary researcher also examined if student assessment and teacher self-assessment of teacher delivery style would align. The research questions …