Digital Commons Network^™

Ionic Electroactive Polymer Devices: Physics-Based Modeling With Experimental Investigation And Verification, Tyler Paul Stalbaum

UNLV Theses, Dissertations, Professional Papers, and Capstones

The primary focus of this study is to examine, understand, and model ionic electroactive polymer based systems in attempt to further develop this field of study. Physics-based modeling is utilized, as opposed to empirical modeling, to achieve a deeper insight to the underlying physics. The ionic electroactive polymer system of primary interest in this study is ionic polymer-metal composite (IPMC) devices. Other similar devices, such as anion-exchange membrane (AEM) type actuators and flow battery systems are also investigated using the developed model. The underlying physics are in the studies of transport phenomenon for describing the ionic flow within the polymer …

The Effect Of Blackboard Tools On The Community Of Inquiry And Learner Satisfaction With Learning Management System-Enabled Courses, Alice Swift

UNLV Theses, Dissertations, Professional Papers, and Capstones

Online education has increased in popularity throughout higher education in recent decades, with learning management systems (LMSs) now being used by the majority of higher education institutions throughout the United States (Allen, Seaman, Poulin, & Straut, 2016). The Community of Inquiry (CoI) theoretical framework is composed of interrelated cognitive, teaching, and social presences, which make up a deeper learning experience (Garrison, Anderson, & Archer, 2010). This study sought to further the theoretical and practical application of the CoI by evaluating learner satisfaction with LMS-enabled courses in vocational areas of study and additional course delivery formats (online, hybrid, and web-enhanced). Results …

Analyses Of Streamflow Change Patterns And Correlation Of These Changes With Sea-Surface Temperature Fluctuations, Kazi Ali Tamaddun

UNLV Theses, Dissertations, Professional Papers, and Capstones

This thesis presents a comprehensive statistical analysis that determines the direction, rate, and interval of significant streamflow change patterns in the continental U.S. and correlates these changes with sea-surface temperature fluctuations. First, by using two non-parametric tests, namely, the Mann-Kendall trend test and the Pettitt’s test, the presence of long-term trends and abrupt shifts were determined at 10% significance level over continuously adjustable periods that stretched from 1903 to 2012. Modified versions of the tests were applied to account for the presence of persistence (autocorrelation) in data. Theil-Sen slope was determined to evaluate the rate of change across multiple temporal …

The Effects Of Cryopreservation On Human Dental Pulp-Derived Mesenchymal Stem Cells, Allison Elaine Tomlin

UNLV Theses, Dissertations, Professional Papers, and Capstones

Many studies have demonstrated clinical applications for the use of dental pulp stem cells (DPSC) for the treatment of various conditions. This has driven medical and scientific interest in the collection, isolation and banking of DPSC tissues for research into these potential therapies. Few studies to date have evaluated the viability of DPSC following long-term cryopreservation. The purpose of this study is to evaluate the effects of cryopreservation on dental pulp-derived stem cells (DPSC) viability over a period of three years. Dental pulp-derived stem cells were isolated and cultured from thirty-one healthy teeth. DPSC isolates were assessed for doubling-time and …

Enhancing The Draft Assembly With Minhash, Saju Varghese

UNLV Theses, Dissertations, Professional Papers, and Capstones

In this thesis, we report on the use of minhash techniques to improve the draft assembly of a genome mapping. More specifically, we use minhash to compare the scaffolds of sea urchin and sea cucumber genomes.

One of the main contributions of this thesis is the implementation of minhash with the Message Passing Interface (MPI) utilizing Intel Phi co-processors. It is shown that our implementation significantly reduces the processing time for identification of k-mer similarities.

The Effects Of An Inclined And Declined Slope On Backward Locomotion: A Kinematic And Electromyographic Analysis Of Retrowalking, Song Dan Vo

UNLV Theses, Dissertations, Professional Papers, and Capstones

The purpose of this study was to investigate the effects of an inclined and declined slopeon kinematic properties and muscle activation magnitudes. This purpose was achieved by using a +10% grade for inclined backward walking (IBW) and -10% grade for declined backwardwalking (DBW) on a treadmill. Eleven participants (24.6 ± 4.1 yrs, 68.5 ± 14.6 kg, 1.7 ± 0.1 m) were recruited from the UNLV student body and were subject to a three day adaptation protocol to allow them to choose a preferred walking speed and to familiarize themselves with such a novel task. Two consecutive practice days included a …

Thinking About Those Who Value You Based On How Smart You Are: Effects On Effort And Test Anxiety, Lucie Vosicka

UNLV Theses, Dissertations, Professional Papers, and Capstones

The work examined whether activating a domain of a close other’s contingency of acceptance leads to more anxiety in anticipation of an evaluative performance in that domain (Study 1), and greater effort toward improving oneself in that domain (Study 2). In a between-group experimental design, contingencies of acceptance were manipulated by a guided visualization of a close other whose acceptance was perceived either as non-contingent (intrinsic), contingent on a task-irrelevant domain (physical appearance), or contingent on a task-relevant domain (competence). The effects of the acceptance contingency condition on anxiety and effort were not statistically significant. However, in Study 1, six …

Behavioral Reactions To Emotional And Physical Infidelity: An Evolutionary Perspective, Mandy Walsh Walsh

UNLV Theses, Dissertations, Professional Papers, and Capstones

This thesis examined the effects of sex and type of partner infidelity, including both physical (i.e., sexually involved with another person) and emotional (i.e., emotionally involved with another person) infidelity, on mate abandonment behaviors. Previous research has demonstrated sex differences in emotional responses to infidelity, where men react more negatively to physical infidelity and women react more negatively to emotional infidelity. While various studies have investigated perceived behavioral reactions using imagined scenarios, this study expands current research by utilizing actual retrospective reports. It was hypothesized that males would engage in significantly more mate abandonment behaviors after experiencing a physical infidelity, …

Stay Brave My Hercules, Ernie Wang

UNLV Theses, Dissertations, Professional Papers, and Capstones

“Stay Brave My Hercules” is a collection of nine original short stories separated into two sections: “Stay Brave My Hercules” and “Matsuri”.

In the first section, “Stay Brave My Hercules”, I explore the themes of hypermasculinity, loneliness, and insecurity, in particular the points in which they intersect. These stories are narrated by different male characters between the ages of seventeen and twenty-seven and who all struggle in different ways to conform to masculine norms.

In the second section, “Matsuri”, I explore the themes of family, loss, and devastation through the eyes of the Japanese and Japanese-Americans during World War II. …

Testing A Comprehensive Model Of Body Image, Anxiety, And Eating Pathology Among College Men, Emily Katherine White

UNLV Theses, Dissertations, Professional Papers, and Capstones

Historically, researchers conceptualized eating disorders, subclinical eating pathology, and negative body image as issues that only affected women. However, more recent research suggests that men experience significant body image concerns that mirror current Western cultural ideals of appearance (i.e., desire to attain a lean, muscular physique with very little body fat). Theoretically, men with a strong desire to achieve this cultural ideal (i.e., drive for muscularity) may experience dissatisfaction with their appearance (i.e., muscle dysmorphia), unpleasant psychological states (e.g., social physique anxiety), and engage in potentially harmful behaviors related to eating pathology (e.g., body checking) that lead to clinical impairment …

Statistical Inference Of Genetic Forces Using A Poisson Random Field Model With Non-Constant Population Size, Jianbo Xu

UNLV Theses, Dissertations, Professional Papers, and Capstones

The fidelity of DNA sequence data makes it a perfect platform for quantitatively analyzing and interpreting evolutionary progress. By comparing the information between intraspecific polymorphism with interspecific divergence in two sibling species, the well established Poisson Random Field theory offers a statistical framework with which various genetic parameters such as natural selection intensity, mutation rate and speciation time can be effectively estimated. A recently developed time-inhomogeneous PRF model has reinforced the original method by removing the assumption of stationary site frequency, but it preserves the condition that the two sibling species share same effective population size with their ancestral species. …

Influence Of Ph And Acidic Side Chain Charges On The Behavior Of Designed Model Peptides In Lipid Bilayer Membranes, Venkatesan Rajagopalan

Graduate Theses and Dissertations

The molecular properties of transmembrane proteins and their interactions with lipids regulate biological function. Of particular interest are interfacial aromatic residues and charged residues in the core helix whose functions range from stabilizing the native structure to regulating ion channels. This dissertation addresses the pH dependence and influence of potentially negatively charged tyrosine, glutamic acid or aspartic acid side chains. We have employed GWALP23 (acetyl-GGALW5LALALALALALALW19LAGA-amide) as favorable host peptide framework. We have substituted W5 with Tyr (Y5GWALP23) and Leu residues with Glu (L12E, L14E or L16E) or Asp (L14D or L16D), and have incorporated specific 2H-labeled alanine residues within the …

Assessing The Effects Of Interactive Video Modeling On The Fidelity Of Implementation Of Skill-Acquisition Procedures, Steven Sparks

Dissertations

Behavior-analytic study has led to many advances in staff training over the last several decades. The effectiveness of modeling, role-play, and video modeling are well demonstrated in scientific literature but these techniques are often time consuming for those conducting the training which often leads to their being quite costly. Interactive video modeling is an alternative that is potentially more cost and time efficient. This type of modeling consists of embedding response opportunities in traditional video models that require the trainee to answer questions in order to complete the video. Being required to answer the embedded questions causes the trainee to …

Counselor Preparation And Adolescent Youth: A Study Of Clinical Mental Health Counselors, Brian R. Russ

Dissertations

Prevalence data have raised concerns that child and adolescent mental health issues are at an epidemic level. For example, Knopf, Park, and Mulye (2008) suggested that 20-25% of all youth experience symptoms of distress. Researchers have also estimated that one in five adolescents in the United States have a diagnosable mental health disorder, and one in ten with a disorder that would be considered severe (Kessler, Berglund, Demler, et al., 2005; Knopf, Park, & Mulye, 2008). Yet, the training of clinical mental health counselors who work with adolescent populations has received limited attention in the counselor education literature. Although the …

Visual Impairment And Factors Associated With Difficulties With Daily Tasks, Anne T. Riddering

Dissertations

In the past 10 years, the number of American adults with visual impairments has increased from 1 million to 4 million and is expected to double to 8 million people by the year 2050 (The Eye Diseases Prevalence Research Group, 2004; National Eye Institute, 2013). Therapies to treat retinal diseases causing visual impairment, such as diabetic retinopathy and age-related macular degeneration (Massof, 2002; Mogk, 2011), have evolved in the past two decades (Gupta et al., 2013; Hooper & Guymer, 2003), but little research has examined recent population and difficulties with performing daily activities. Different types of professionals, including ophthalmologists, optometrists, …

An Analysis Of Campus Violence Threat Assessment Policy Implementation At Michigan Community Colleges, Russell T. Panico Jr.

Dissertations

This dissertation evaluated campus violence threat assessment policy and procedure implementation at the community college level of higher education. The importance of this topic was to provide a manageable and collaborative initiative for leadership at institutions of higher learning to identify, develop, implement, and evaluate a policy that can effectively prevent acts of campus-related violence. A mixed-methods study approach using a Likert-scale survey with supporting open-ended questions was used to guide the exploration. Bardach’s (2016) Eightfold Path for Policy Analysis was the framework used by Michigan community colleges to apply to their own unique situations. This method determined the prevalence …

Development Of Printed Cross-Functional Sensors For Gearbox Lubricant Prognostics, John Omondi Manyala

Dissertations

Lubricant oil degradation is a major cause of failures in transportation machinery such as pumps, engines, and gearboxes. Proactive oil maintenance techniques such as the off-line oil sampling for laboratory analysis are not only costly but are also susceptible to various influences during the oil sampling, transportation and testing. In this study, an on-line oil condition monitoring system is presented with an integrated predictive prognostic scheme, describing the evolution in time of the identified fault indicators for purposes of estimating the remaining useful life of oil in real-time inside the gearbox. The proposed methodology facilitates on-demand gearbox maintenance rather than …

Marine Microalgae: Climate, Energy, And Food Security From The Sea, Charles H. Greene, Mark E. Huntley, Ian Archibald, Léda N. Gerber, Deborah L. Sills, Joe Granados, Jefferson W. Tester, Colin M. Beal, Michael J. Walsh, Robert R. Bidigare, Susan L. Brown, William P. Cochlan, Zackary I. Johnson, Xin Gen Lei, Stephen C. Machesky, Donald Redalje, Ruth E. Richardson, Viswanath Kiron, Virginia Corless

Faculty Publications

Climate, energy, and food security are three of the greatest challenges society faces this century. Solutions for mitigating the effects of climate change often conflict with solutions for ensuring society’s future energy and food requirements. For example, BioEnergy with Carbon Capture and Storage (BECCS) has been proposed as an important method for achieving negative CO2 emissions later this century while simultaneously producing renewable energy on a global scale. However, BECCS has many negative environmental consequences for land, nutrient, and water use as well as biodiversity and food production. In contrast, large-scale industrial cultivation of marine microalgae can provide society with …

Error Analysis Of An Hdg Method For A Distributed Optimal, Huiqing Zhu, Fatih Celiker

Faculty Publications

In this paper, we present a priori error analysis of a hybridizable discontinuous Galerkin (HDG) method for a distributed optimal control problem governed by diffusion equations. The error estimates are established based on the projection-based approach recently used to analyze these methods for the diffusion equation. We proved that for approximations of degree k on conforming meshes, the orders of convergence of the approximation to fluxes and scalar variables are k+1 when the local stabilization parameter is suitably chosen.

Infant And Young Child Feeding And Care Practices Of Caregivers In Albay, Philippines, J.L. C. Ignacio

Graduate Student's Output

Proper infant and young child feeding (IYFC) is crucial to attaining good health status and development of children, especially during the first two years of life when children are most vulnerable to malnutrition. Recent calamities also necessitate strengthening the promotion and support of appropriate IYFC during calamities. In this study, the relationship between indicators and current IYCF and care practices of caregivers and nutritional status of children aged 0 to 23 months in Albay, Philippines is explored. A total of 234 caregivers were randomly selected for this study using multi-stage stratified random sampling. Results showed that no significant difference were …

Local And State Governments Are Taking The Stage When It Is Fda's Curtain Call - Are Local And State Governments' Safety Warnings Preempted By Federal Law?, Melissa M. Card

Journal of Food Law & Policy

Eliminated from fad diets, sworn off by celebrities, and frantically reformulated out of processed foods, added sugars have been deemed the new nutritional scoundrel. Recent studies from the American Heart Association, the World Health Organization, and the American Cancer Association demonstrate that the consumption of added sugar leads to increased risks of obesity, diabetes, heart disease, and gout. While all foods containing added sugar are deemed unhealthy, Sugary-Sweetened Beverages ("SSBs") are said to be especially toxic by the American health community, by virtue of these beverages' being excessively high in added sugar content, low in satiety, and incomplete in compensation …

Towards Multipurpose Readability Assessment, Ion Madrazo

Boise State University Theses and Dissertations

Readability refers to the ease with which a reader can understand a text. Automatic readability assessment has been widely studied over the past 50 years. However, most of the studies focus on the development of tools that apply either to a single language, domain, or document type. This supposes duplicate efforts for both developers, who need to integrate multiple tools in their systems, and final users, who have to deal with incompatibilities among the readability scales of different tools. In this manuscript, we present MultiRead, a multipurpose readability assessment tool capable of predicting the reading difficulty of texts of varied …

Kinetic Control Of Nucleic Acid Strand Displacement Reactions, Xiaoping Olson

Boise State University Theses and Dissertations

Nucleic acids are information-dense, programmable polymers that can be engineered into primers, probes, molecular motors, and signal amplification circuits for computation, diagnostic, and therapeutic purposes. Signal amplification circuits increase the signal-to-noise ratio of target nucleic acids in the absence of enzymes and thermal cycling. Amplification is made possible via toehold mediated strand displacement – a process where one nucleic acid strand binds to a nucleation site on a complementary helix, which then displaces one of the two strands in a nucleic acid complex. When compared to polymerase chain reactions (PCR), the sensitivity and stability of toehold-mediated strand displacement reactions suffer …

Evaluating The Suitability Of Microbial Induced Calcite Precipitation Technique For Stabilizing Expansive Soils, Sikha Neupane

Boise State University Theses and Dissertations

Expansive soils, also known as swell-shrink soils have been a problem for civil infrastructures including roads and foundations from ancient times. The use of chemical additives such as cement and lime to stabilize expansive soils is a common practice among geotechnical engineers especially for lightly loaded structures. However, several occurrences of subgrade failures were observed after stabilizing with chemical additives hence engineers are in search of sustainable stabilization alternatives. Microbial Induced Calcite Precipitation (MICP) is gaining attention as an environmental friendly soil improvement technique. Several researchers have successfully tested its feasibility in mitigating liquefaction induced problems in sandy soils. This …

To Boldly Go: Boldness Predicts Behavior And Survivorship Of A Critical Prey Species, Zoe Katherine Tinkle

Boise State University Theses and Dissertations

Understanding population dynamics is at the core of conservation biology. However, our understanding of the mechanisms driving population dynamics remains unclear in many cases. Animal behavior in response to biotic and abiotic stressors is an important driver of these population dynamics and varies both within- and among-individuals in a population. Consistent differences in behavior among individuals within a population are referred to as personality traits. Boldness, a personality trait representing the willingness of an individual to engage in risky behavior, may help predict individual and community-level consequences, such as survivorship. Here, we investigated the inter- and intra-individual variation in risk-taking …

Integrated Circuit Design For Hybrid Optoelectronic Interconnects, Kehan Zhu

Boise State University Theses and Dissertations

This dissertation focuses on high-speed circuit design for the integration of hybrid optoelectronic interconnects. It bridges the gap between electronic circuit design and optical device design by seamlessly incorporating the compact Verilog-A model for optical components into the SPICE-like simulation environment, such as the Cadence design tool.

Optical components fabricated in the IME 130nm SOI CMOS process are characterized. Corresponding compact Verilog-A models for Mach-Zehnder modulator (MZM) device are developed. With this approach, electro-optical co-design and hybrid simulation are made possible.

The developed optical models are used for analyzing the system-level specifications of an MZM based optoelectronic transceiver link. Link …

Estimating Length Statistics Of Aggregate Fried Potato Product Via Electromagnetic Radiation Attenuation, Jesse Lovitt

Boise State University Theses and Dissertations

This work investigates the feasibility of using non-destructive testing, in particular radiation tomography, to recover length statistics from aggregates of fried batonnet cut potato. Non-destructive testing comprises a variety of useful techniques for determining properties of an object that might otherwise require altering or destroying the object physically. Tomography is a common form of non-destructive testing used primarily to infer properties internal to an object. This process involves exposing the object of interest to radiation and detecting the quantity of radiation energy that penetrates the object, usually resulting in a grey scale image.

To do this, an artificial data pipeline …

Examining The Influence Of Number Line Fraction Task Characteristics On Student Work, Sharlee Hatch

Boise State University Theses and Dissertations

Research supports the claim that classrooms with teachers who respond to student thinking in the mathematics classroom will see greater student gains and student success (Lamon, 1996; Sleep & Boerst, 2012). The topic of fractions is both difficult to teach and learn, but has important implications on future success in mathematics and in life. This study set out to explore the ways in which student work is influenced by characteristics of number line fraction tasks. By examining task type, number line structure, and number choice this study shares the way these task characteristics influenced student strategies. The relationship between task …

Barn Owls (Tyto Alba) Crossing The Road - Examining The Interplay Among Occupancy, Behavior, Habitat Selection, And Roadway Mortality In Southern Idaho, Tempe Regan

Boise State University Theses and Dissertations

Barn Owls (Tyto alba) are killed by vehicle collisions in greater numbers than any other North American bird of prey. Interstate-84 (I-84) in southern Idaho, USA has among the world’s highest known rates of Barn Owl-vehicle collisions. Little is known about Barn Owl occupancy in this region, so it is unclear if owls are killed in proportion to their abundance, or if they are equally abundant in segments with lower mortality and somehow escape collisions. Furthermore, studies of Barn Owl movements and behavior are limited. I was interested in understanding (1) factors that affect Barn Owl occupancy in …

Focus Structures In Copala Triqui, Zena Zimmerglass

Linguistics

The purpose of this research is to identify the techniques used by speakers of Copala Triqui to focus one or more constituents in a sentence. Copala Triqui is a native Mexican language originating in the region that is now San Juan Copala, Mexico. In this experiment, we tested for five types of focus: broad focus, subject focus, object focus, contrastive subject focus, and contrastive object focus. We captured these patterns by having speakers answer Triqui questions that elicited the appropriate type of focus. We found that some focused sentences allow for deviations in word order from non-focused or broad-focused ones. …