Digital Commons Network^™

Fuel Performance Modeling Of Reactivity-Initiated Accidents Using The Bison Code, Charles Pearson Folsom

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Fukushima Daiichi nuclear accidents in 2011 sparked considerable interest in the U.S. to develop new nuclear fuel with enhanced accident tolerance. Throughout the development of these new fuel concepts they will be extensively modeled using specialized computer codes and experimentally tested for a variety of different postulated accident scenarios. One accident scenario of interest, reactivity-initiated accident, is a nuclear reactor event involving a sudden increase in fission rate that causes a rapid increase in reactor power and temperature of the fuel which can lead to the failure of the fuel rods and are lease of radioactive material. The focus …

Twentieth Century Channel Change Of The Green River In Canyonlands National Park, Utah, Alexander E. Walker

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Since the early 20^th century, river channels of the Colorado River basin have narrowed, decreasing available riparian and aquatic habitat. Changes are considered to be the result of three major factors: wide-spread water development, increasing hydroclimate variability and the invasion of non-native tamarisk (Tamarix spp.), altering flow regime and sediment supply. Different studies have reached different conclusions about the relative roles of flow regime, sediment supply and tamarisk in causing narrowing.

I investigated channel change in the lower Green River within Canyonlands National Park to describe channel changes in the 20^th century and understand the roles …

Landscape Architecture Education: A Study Of Patterns, Tanya Rice

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This research is focused on analyzing landscape architecture education of accredited bachelor programs in the U.S. The primary intent was to obtain a comprehensive understanding of the current state of landscape architecture education and the direction in which it is heading. This was conducted through an evaluation of each landscape architecture program’s course offerings. The objectives were to explore the degree of coherence and dispersion of course requirements among programs, compare similarities and differences and identify current patterns, trends, strengths and emphases of the programs. Then design course descriptions were analyzed for identification of word families and cluster networks to …

Exact Approaches For Bias Detection And Avoidance With Small, Sparse, Or Correlated Categorical Data, Sarah E. Schwartz

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Every day, traditional statistical methodology are used world wide to study a variety of topics and provides insight regarding countless subjects. Each technique is based on a distinct set of assumptions to ensure valid results. Additionally, many statistical approaches rely on large sample behavior and may collapse or degenerate in the presence of small, spare, or correlated data. This dissertation details several advancements to detect these conditions, avoid their consequences, and analyze data in a different way to yield trustworthy results.

One of the most commonly used modeling techniques for outcomes with only two possible categorical values (eg. live/die, pass/fail, …

Geological Characterization Of Precambrian Nonconformities: Implications For Injection-Induced Seismicity In The Midcontinent United States, Laura Cuccio

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The midcontinent United States, a region which typically does not experience many earthquakes, has experienced a significant increase in the number of earthquakes over the last decade. This increase in earthquake activity has been linked to wastewater injection, a process in which large volumes of wastewater from oil and gas extraction are injected into deep (2-3 km), high-permeability sedimentary rocks, near low-permeability Precambrian (>540-million-year-old) crystalline ‘basement’ rocks. The contact between these two rock types is referred to as the Precambrian nonconformity. Injection-induced earthquakes occur on or near basement-hosted faults due to an increase in pore fluid pressures, which implies …

Aerodynamic Centers Of Arbitrary Airfoils, Orrin Dean Pope

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The study of designing stable aircraft has been widespread and ongoing since the early days of Orville and Wilbur Wright and their famous Wright Flyer airplane. All aircraft as they fly through the air are subject to minor changes in the forces acting on them. The field of aircraft stability seeks to understand and predict how aircraft will respond to these changes in forces and to design aircraft such that when these forces change the aircraft remains stable. The mathematical equations used to predict aircraft stability rely on knowledge of the location of the aerodynamic center, the point through which …

The Investigation Of Gravity Waves In The Mesosphere / Lower Thermosphere And Their Effect On Sporadic Sodium Layer, Xuguang Cai

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Gravity waves in the atmosphere are the waves with gravity and buoyancy force as the restoring forces. Gravity waves will significantly impact the Mesosphere Lower / Thermosphere (MLT), and the breaking of gravity waves is the key factor to cause the cool summer and warm winter in the Mesopause region. Therefore, it is important for us to investigate gravity waves. In this dissertation, we mainly use USU Na lidar data to explore gravity waves in the MLT. The exploration is made up of two projects. One is the investigation of gravity wave breaking and the associated dynamic instability by USU …

Impacts Of Distributions And Trajectories On Navigation Uncertainty Using Line-Of-Sight Measurements To Known Landmarks In Gps-Denied Environments, Ryan D. Lamoreaux

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Unmanned vehicles are increasingly common in our world today. Self-driving ground vehicles and unmanned aerial vehicles (UAVs) such as quadcopters have become the fastest growing area of automated vehicles research. These systems use three main processes to autonomously travel from one location to another: guidance, navigation, and controls (GNC). Guidance refers to the process of determining a desired path of travel or trajectory, affecting velocities and orientations. Examples of guidance activities include path planning and obstacle avoidance. Effective guidance decisions require knowledge of one’s current location. Navigation systems typically answer questions such as: “Where am I? What is my orientation? …

Behavior Of Copper Oxide Nanoparticles In Soil Pore Waters As Influenced By Soil Characteristics, Bacteria, And Wheat Roots, Joshua Hortin

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The goal of this project was to study the behavior of copper oxide nanoparticles in soil environments. Copper oxide nanoparticles have antimicrobial properties and may also be used in agricultural settings to provide a source of copper for plant health, but accidental or misapplication of these nanoparticles to soil may be damaging to the plant and its associated bacteria.

Dissolved soil organic matter that is present in soil pore waters dissolved nanoparticles, but did not dissolve the expected amounts from a geochemical model because the geochemical model did not take into account surface chemistry or coating of the nanoparticles by …

Exploring And Describing The Spatial And Temporal Dynamics Of Medusahead In The Channeled Scablands Of Eastern Washington Using Remote Sensing Techniques, Timothy M. Bateman

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Medusahead is a harmful weed that is invading public lands in the West. The invasion is a serious concern to the public because it can reduce forage for livestock and wildlife, increase fire frequency, alter important ecosystem cycles (like water), reduce recreational activities, and produce landscapes that are aesthetically unpleasing. Invasions can drive up costs that generally require taxpayer’s dollars. Medusahead seedlings typically spread to new areas by attaching itself to passing objects (e.g. vehicles, animals, clothing) where it can quickly begin to affect plants communities. To be effective, management plans need to be sustainable, informed, and considerate to invasion …

Allowing The Untellable To Visit: Investigating Digital Folklore, Ptsd And Stigma, Geneva Harline

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In the introduction of 2012 issue of The Journal of Folklore Research, Diane Goldstein and Amy Shuman issue a “call to arms for folklorists … to concentrate on the vernacular experience of the stigmatized.” (Goldstein and Shuman, 2012:116). Drawing on this call to arms, this thesis investigates how Post-Traumatic Stress Disorder (PTSD) is portrayed in social media through memes and captioned images. I argue that the genres of memes and captioned images in digital folklore work to help mitigate the stigma of PTSD because the veneer of anonymity in the digital world allows people with PTSD to be willing …

Stream Temperature Monitoring And Modeling To Inform Restoration: A Study Of Thermal Variability In The Western Us, Jessica R. Wood

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Water temperature is an important variable for aquatic ecosystems. Salmonid population numbers and distribution are heavily influenced by stream temperature, and there is growing concern about the health of salmonid populations with anticipated climate change. Managers are looking to efficiently evaluate options to maintain stream temperatures needed by salmonids. This study evaluated and compared stream temperature restoration alternatives in two streams with warm temperatures using stream temperature monitoring and modeling.

The first study identified pockets of cold water that are important to native fish species in Nevada’s Walker River. Comparison of monitoring results with existing basin-scale model outputs identified two …

Ecology Of Greater Sage-Grouse Inhabiting The Southern Portion Of The Rich-Morgan-Summit Sage-Grouse Management Area, M. Brandon Flack

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Greater sage-grouse (Centrocercus urophasianus; sage-grouse) are sagebrush obligates and are therefore considered to be key indicators of sagebrush ecosystem health. Sage-grouse populations have declined range-wide over the last century due to loss and fragmentation of sagebrush (Artemisia spp.) habitats. Sage-grouse populations found in large intact sagebrush landscapes are considered to be more resilient, however, some small isolated populations persist and thrive in fragmented landscapes. Because of Utah’s unique topography and geography, sage-grouse habitat is discontinuous and populations are naturally dispersed throughout the state in suitable intact blocks or in disconnected islands of sagebrush habitat. Thus, Utah populations …

Real Simple Lie Algebras: Cartan Subalgebras, Cayley Transforms, And Classification, Hannah M. Lewis

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The differential geometry software package in Maple has the necessary tools and commands to automate the classification process for complex simple Lie algebras. The purpose of this thesis is to write the programs to complete the classification for real simple Lie algebras. This classification is difficult because the Cartan subalgebras are not all conjugate as they are in the complex case. For the process of the real classification, one must first identify a maximally noncompact Cartan subalgebra. The process of the Cayley transform is used to find this specific Cartan subalgebra. This Cartan subalgebra is used to find the simple …

Regulation And Energy Poverty In The United States, Michael C. Jensen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Energy poverty is a topic often neglected in the discussion about global climate change. Apocalyptic prophecies about the negative future effects of climate change ignore the suffering of people around the globe whose lives could be drastically improved with access to reliable sources of energy. Though energy poverty from a global perspective is much more serious than energy poverty from a domestic perspective, high home energy bills are a serious cause for concern for many Americans.

This research examines the relationship between regulation, the prices of electricity and natural gas, and the household energy burden, which is the ratio of …

Enhancing Ductility Of One-Way Concrete Slabs Reinforced With Welded Wire Reinforcement, Mohamed K. Shwani

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A series of research studies have recently identified an issue called strain localization in welded wire reinforced (WWR) members. This phenomenon reportedly concentrates strains at welded cross wire locations and severely limit ductility. Those that identified the phenomenon used it to imply that WWR is unsafe because it does not warn of failure. This dissertation is investigating details to mitigate the strain localization effect and demonstrate the WWR can be used safely. A moment curvature analysis is developed using Response2000 program and calibrated using experimental data. Parametric study was developed to present a recommendation of details and minimum reinforcement required …

Land Use Dynamics And Implications For Water Management In The Urbanizing Wasatch Range Metropolitan Area Of Utah, Enjie Li

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Utah is one of the fastest growing states in the USA. Utah’s Wasatch Range Metropolitan Area (WRMA), where 80% of Utah’s population resides, is growing at unprecedented rates and has seen extensive urban landscape transformation in the last half century. Many of Utah’s agricultural lands, grasslands, and wetlands have been transformed into urban areas during this time. Local residents have watched and experienced these changes to their local environment, but without a clear understanding of the processes and impacts of urbanization. It is not until we study these landscapes from a spatial perspective and the time scale of decades that …

From Eden To Dystopia: An Ecocritical Examination Of Emergent Mythologies In Early Los Angeles Literary Texts, Jaquelin Pelzer

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In From Eden to Dystopia: An Ecocritical Examination of Emergent Mythologies in Early Los Angeles Literary Texts, ecocriticism and critical regionalism were utilized alongside other American Studies practices to analyze nineteenth- and early-twentieth-century depictions of nature in Los Angeles. Specifically, these tools were applied to travel guides and narratives of the 1870s and 1880s, the turn-of-the-century magazine The Land of Sunshine, Upton Sinclair’s Oil! (1926) and Raymond Chandler’s The Big Sleep (1939), and other non-fiction publications of the 1920s and ’30s to track an evolving narrative of Los Angeles as a paradise and later as a place perched …

Seasonal Distribution Of Sage-Grouse In Hamlin Valley, Utah And The Effect Of Fences On Grouse And Avian Predators, Heather Hedden Mcpherron

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Greater sage-grouse (Centrocercus urophasianus; hereafter sage-grouse) numbers have declined throughout the western US and are considered a species of concern in most of the eleven states that are within their range. Sage-grouse habitats have been reduced by approximately 44% since European settlement of the Western United States began (Miller et al. 2011). Loss of habitat has contributed to an average decline of sage-grouse populations by 33% across the range (Connelly and Braun 1997). To expand our knowledge of this species, I monitored 16 radio-collared sage-grouse captured from four leks in Hamlin Valley, Utah, USA in 2011 and 2012 …

Renewable Energy: Prospects, Politics, The Public, And Proximity, Peter G. Robertson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The way our electricity is generated is in a period of rapid change; in the United States and many other countries the system is becoming less reliant on coal based power systems, while natural gas and solar and wind power are becoming more and more important. Technological advances have made solar and wind power more efficient and increasingly cost-effective. While these changes to the electrical system come with great benefits, such as less pollution, these technologies are not free of impacts. The electrical system is inseparable from our modern lifestyle, and because the system is so large this transition will …

Language Proficiency And Cultural Intelligence In Distance English-Language Learning, Jared Marcum

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this study is to explore the viability of an international distance English-language program in the development of language and cultural proficiency. Students participated in tests at the beginning and at the end of the course to determine how well they developed both language and cultural proficiencies. The measures included (a) the computer-administered Oral Proficiency Interview (OPIc) from theAmerican Council on the Teaching of Foreign Languages (ACTFL), (b) ACTFL-aligned assessments of reading, listening, grammar, and vocabulary skills, and (c) the Cultural Intelligence Scale (CQS). In addition, course activities surveys provided additional information about student perceptions of course activities. …

Electron Yield Measurements Of High-Yield, Low-Conductivity Dielectric Materials, Justin Christensen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Materials exposed to the space plasma environment acquire electric charge, which can have harmful effects if it leads to arcing or electrostatic breakdown of important spacecraft components. In fact, spacecraft charging is the leading environmentally induced cause of spacecraft anomalies. This study focuses on measuring electron yield, a property of materials that describes how many electrons are ejected from a material under energetic electron bombardment, which can vary depending on the energy of incident electrons. Intrinsic electron yield is defined as the average number of electrons emitted per incident electron from an electrically neutral material. The specific aim of this …

Integrating Social And Ecological Methods To Assess And Inform Park Monitoring And Management, Kelly A. Goonan

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Managing outdoor recreation requires that managers do the following: (1) consider the user experience, environmental and cultural resources, and type and intensity of management actions; (2) specify desired conditions to be maintained, monitor conditions, and take appropriate action if unacceptable impacts occur; (3) adapt to new conditions and information; and (4) exercise good judgment based on their professional experience and the best information available to them. Social science studies of visitors and studies of significant recreation resources like campsites are important sources of information for managers and are commonly used in parks and protected areas to support planning and decision-making. …

Exploring The Effect Of Disability Microaggressions On Sense Of Belonging And Participation In College Classrooms, Lynsie Harris

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Microaggressions are a form of interpersonal discrimination towards marginalized groups that are often ambiguous in nature and delivered unintentionally. The subtleness of these attacks on identity can make them difficult to recognize and address.

Emerging research reveals that the targets of microaggressions are experiencing negative effects on their wellbeing; however, the bulk of existing literature on this topic only addresses microaggressions perpetrated towards racial minority or LGBT individuals. Little is known about pervasiveness and potential impact of microaggressions directed towards people with disabilities- particularly in academic contexts.

This study pilots a measurement tool, the Microaggressions Towards Students with a Disability …

Acculturation And Language Use In Intimate And Sexual Relationships Among Chinese Bilinguals, Tianyi Xie

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

People of Chinese heritage often face complex challenges because of the conflicting values from China and America, especially on sexuality. Through two thousand years of socialization, Chinese culture grew to endorse conservative sexual values and gender roles. In traditional Chinese culture, women are expected to remain chaste and play submissive roles in marriage. Sexuality is treated as a taboo topic that should not be discussed directly. Asian American youth who endorse less traditional Chinese values experience lower sexual satisfaction, lower confidence in their own abilities, and higher adherence to traditional gender roles. Language has also been found to potentially influence …

Relationship Between The Built Environment, Physical Activity, And Chronic Disease Among Individuals With Disabilities In Rural Communities, Nicholas F. Tanner

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Increased risk for chronic disease is closely associated with individual nutrition, tobacco use, and physical inactivity. This thesis focuses on physical activity as a means of preventing select chronic diseases. A major barrier preventing engagement in physical activity is the built environment. Populations residing in rural environment are not afforded the abundance of opportunities for physical activity prevalent in most urban networks. Of the demographic living in rural environments, individuals with disability face additional barriers to physical activity than those without disability. This leads to a higher prevalence of chronic diseases associated with sedentary lifestyles among populations with disability. Few …

Extensions And Improvements To Random Forests For Classification, Anna Quach

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The motivation of my dissertation is to improve two weaknesses of Random Forests. One, the failure to detect genetic interactions between two single nucleotide polymorphisms (SNPs) in higher dimensions when the interacting SNPs both have weak main effects and two, the difficulty of interpretation in comparison to parametric methods such as logistic regression, linear discriminant analysis, and linear regression.

We focus on detecting pairwise SNP interactions in genome case-control studies. We determine the best parameter settings to optimize the detection of SNP interactions and improve the efficiency of Random Forests and present an efficient filtering method. The filtering method is …

Development Of An Animal Model For Enterovirus For Evaluation D68 For Screening Of Antiviral Therapies, W. Joseph Evans

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Enterovirus D68 (EV-D68) virus has become more prevalent over the last 15 to 20 years. EV-D68 attacks the respiratory system and can cause severe disease in individuals who have underlying respiratory problems. There have also been reports of individuals with EV-D68 showing signs of neurological system problems and acute flaccid paralysis. Because of the increase in patients with EV-D68 and also the potential for neurological disease, an animal model is needed to study the disease and to evaluate experimental therapies for EV-D68 infection.

To develop the animal model, 4-week old AG129 mice that lack alpha and beta interferon receptors, making …

Contributors To Wisconsin’S Persistent Black-White Gap In Life Expectancy, Max T. Roberts

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

For decades, blacks have faced shorter life expectancy than their white counterparts. This persistent disparity has led to a gap in life expectancy between the two groups. Nationally, this gap has decreased over the last 40 years. However, this is not the case at the state-level as some states have experienced little or no improvement in the life expectancy gap. Such is the case in Wisconsin, where the life expectancy gap is the largest in the nation for males, and the gap actually has grown for females over the last two decades. This study seeks to examine this persistent gap …

Application Of Machine Learning And Statistical Learning Methods For Prediction In A Large-Scale Vegetation Map, Carla M. Brookey

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Original analyses of a large vegetation cover dataset from Roosevelt National Forest in northern Colorado were carried out by Blackard (1998) and Blackard and Dean (1998; 2000). They compared the classification accuracies of linear and quadratic discriminant analysis (LDA and QDA) with artificial neural networks (ANN) and obtained an overall classification accuracy of 70.58% for a tuned ANN compared to 58.38% for LDA and 52.76% for QDA.

Because there has been tremendous development of machine learning classification methods over the last 35 years in both computer science and statistics, as well as substantial improvements in the speed of computer hardware, …