Digital Commons Network^™

Asymptotic Multiphysics Modeling Of Composite Beams, Qi Wang

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A series of composite beam models are constructed for efficient high-fidelity beam analysis based on the variational-asymptotic method (VAM). Without invoking any a priori kinematic assumptions, the original three-dimensional, geometrically nonlinear beam problem is rigorously split into a two-dimensional cross-sectional analysis and a one-dimensional global beam analysis, taking advantage of the geometric small parameter that is an inherent property of the structure.

The thermal problem of composite beams is studied first. According to the quasisteady theory of thermoelasticity, two beam models are proposed: one for heat conduction analysis and the other for thermoelastic analysis. For heat conduction analysis, two different …

Under What Conditions Do Community Demographics Influence Aggregate Recycling?, Edward Kotter

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Tons of household waste go to landfills throughout the western United States each year. Recycling has been a popular way for cities to extend the life of landfills by decreasing the amount of waste entering them. The development and implementation of recycling programs has not come without challenges. People recycle or do not recycle for different reasons. Much research has been done to understand who recycles, who does not recycle, and what recycling program characteristics elicit greater participation. This study adds to the existing body of literature by focusing on determinants of community-level recycling in the western United States. This …

Have Introduced Brown Trout (Salmo Trutta) Affected Native Aquatic Vertebrates In Western United States Streams?, Nora K. Burbank

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The introduction of exotic species to areas outside of their native range is one of the greatest threats to the biodiversity of native freshwater organisms. Exotic species have outcompeted native species for resources such as food and shelter, and in some cases these interactions have resulted in local extinctions or reductions in abundance of those native species. Brown trout are native to Eurasia, but have been introduced to much of the rest of the world, including the United States. In some parts of their introduced range, brown trout have substantially reduced the abundance and home ranges of some native fish …

Class-Wide Respect And Social Support Skill Training To Increase Peer Interactions Of Students With Autism Spectrum Disorders, Melanie Orton

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The demand for effective social skills interventions for children with autism spectrum disorders is a pertinent issue for school-based professionals. One approach to increase appropriate social skills is to involve peer support by training a few socially competent children to positively interact with a student with an ASD. Potentially, training larger groups of children could result in increasing the number of different peers who would actively support positive interactions with their classmates with ASD. Thus, the present study investigated the effect of a class-wide peer-training strategy on the percentage of positive social interaction and number of peer contacts for three …

Optimization Of Dissolved Air Flotation For Algal Harvesting At The Logan, Utah Wastewater Treatment Plant, Andrew R. Elder

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Research being completed at the Logan, UT wastewater treatment plant could provide a locally-sourced gasoline replacement by collecting algae that grows naturally. This process would also provide the City of Logan with a method to meet certain standards set by the state of Utah.

Problem and proposed solution:

The water leaving Logan’s wastewater treatment plant has high levels of phosphorus and nitrogen, two elements that are found in all wastewater treatment plants. These two substances need to be controlled, because they kill fish and cause pond scum to grow in recreational reservoirs downstream. A unique method has been found to …

Movement Of Air Through Submerged Air Vents, Clay W. Woods

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Utah Water Research Lab (UWRL) proposes to study the behavior of air bubbles in submerged vent tubes. This study is coordinated with a study for the Las Vegas wastewater treatment system that discharges into Lake Mead. The UWRL collaborates with government agencies and private companies to research water-related issues around the world. The behavior of air bubbles is of interest in order to more efficiently vent air from pipelines with submerged vent tubes. The Las Vegas wastewater treatment system discharges into Lake Mead and is required to meet an environmental guideline that no air bubbles are discharged into the …

Evaluation Of An Incompressible Energy-Vorticity Turbulence Model For Fully Rough Pipe Flow, Doug F. Hunsaker

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Traditional methods of closing the Boussinesq-based Reynolds-averaged Navier-Stokes equations are considered, and suggestions for improving two-equation turbulence models are made. The traditional smooth-wall boundary conditions are shown to be incorrect, and the correct boundary conditions are provided along with sample solutions to traditional models. The correct boundary condition at a smooth wall for dissipation-based turbulence models is that which forces both the turbulent kinetic energy and its first derivative to zero. Foundations for an energy-vorticity model suggested by Phillips are presented along with the near-smooth-wall behavior of the model. These results show that at a perfectly smooth wall, the turbulent …

Axisymmetric Finite Element Modeling Of Adhesive Joint Between A Laminated Composite And Metal Cylinder, Casey A. Talbot

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Because lowering weight as much as possible is desirable in all applications designed to go to space, the use of composite materials is desirable. Composites are materials that are made up of two or more separate materials usually with significantly different characteristics which remain separate and distinct in their completed state. Fiber-reinforced epoxy composites, in general, are very strong and light. Because most space structures cannot solely be made of composites, a method to join them with metals is needed. Adhesive joining, or gluing, has been determined to be the most promising option.

For the joining technique to be used, …

Seasonal Influenza Vaccination Disparities Between U.S. Non-Hispanic Whites And Hispanics, 2000-2009, Andrew E. Burger

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Seasonal influenza produces substantial disease within the United States every year. Despite the availability of safe and effective vaccines for influenza, millions of individuals go unvaccinated each flu season, with notable differences across racial/ethnic groups. Using the Behavioral Risk Factor Surveillance System (BRFSS), I examine vaccination rates among non-Hispanic whites and Hispanics during the 2000-2009 influenza seasons. After developing a new method that addresses shortcomings of BRFSS vaccination measures, I find that non-Hispanic whites exhibit higher vaccination rates than Hispanics. Through a series of logistic regression models I show that the disparities between non-Hispanic whites and Hispanics narrow after controlling …

Latency As A Dependent Variable In Trial-Based Functional Analysis, Elizabeth Dayton

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The following research project consisted of two parts. The first was a data analysis of previously collected data. The second was conducted in local public schools at no cost to the teachers, students, or schools. Many individuals with disabilities engage in aberrant behaviors that negatively affect their lives and the lives of those around them. The following research paper examined a tool currently being used in schools (trial-based functional analysis; FA) to determine its effectiveness at identifying the function of an individual’s behavior.

The trial-based FA is an assessment tool that is accessible to classroom teachers to help them identify …

Fish Passage Through Rehabilitated Culverts Laboratory Study, Amber H. Olsen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Slip lining culverts represent a low-cost technique that can restore life to decaying culverts. However, slip liners are smoother than typical host culverts; therefore, they generate higher flow velocities and lower flow depths within the culvert, which are fish passage barriers. One way to mitigate these barriers is by installing baffles. Unfortunately baffles can jeopardize the flow capacity of the culvert.

The Utah Water Research Laboratory (UWRL) at Utah State University contracted with the Utah Department of Transportation for $85,000 to test the effectiveness of baffles in improving fish passage through culverts. The goal of this project was to identify …

Inkjet-Printed Highly Transparent Solar Cell Antennas, Jesus A. Arellano

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Small satellites, especially Cube Satellites (CubeSats), have become important vehicles for space exploration. One of the challenges CubeSats face is limited surface area. This limitation poses a question for antenna design–where to mount the antenna? Transparent antenna is a solution to resolve the competition between solar cells and antennas for surface area. The transparent antennas can be directly integrated on top of solar cells without requiring additional space. It is for this reason that this thesis focuses on the integration of highly transparent meshed antenna with solar cells. Even though transparent antennas allow light to travel light through them, they …

Predictive Modeling And Analysis Of Student Academic Performance In An Engineering Dynamics Course, Shaobo Huang

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Engineering dynamics is a fundamental sophomore-level course required for many engineering students. This course is also one of the most challenging courses in which many students fail because it requires students to have not only solid mathematical skills but also a good understanding of dynamics concepts and principles.

The overall goal of this study was to develop a validated set of mathematical models to predict student academic performance in an engineering dynamics course taught in the College of Engineering at Utah State University. The predictive models will help the instructor to understand how well or how poorly the students in …

A Comparison Of Caregiver Report And Performance-Based Measures Of Functional Ability In Dementia: An Examination Of Moderating Variables, Christine M. Snyder

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study examined the association between data collection techniques used to measure functional abilities in individuals with dementia. Cognitive, functional, and behavioral data were collected through the Cache County Dementia Progression Study for individuals with dementia and their caregivers. The caregivers’ reports of care recipients’ functional status were compared with the care recipients’ scores on a performance-based measure of functional abilities. Analyses showed moderate correlation between caregivers’ reports and objective measures, with no significant effect of caregiver demographic or mental health factors. However, care recipients’ sensory motor impairments reduced the association between the two assessment methods.

Visits occurred at the …

Managing Water Shortages In The Weber Basin Using The Water Evaluation And Planning (Weap) System, Bereket K. Tesfatsion

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Water is a scarce natural resource while the demand for water grows constantly. In Utah, most of the water resources have already been developed. In addition, Utah is prone to drought events and the effects of climate change may exacerbate the already dire situation. Hence, managing this scarce resource efficiently is very important in meeting the growing demand.

Reservoirs are used to store water which is subsequently released to meet demands. For management purposes, reservoirs have different zones such as flood control zone, conservation zone, buffer zone and inactive zone. Water is normally released from the conservation zone. The water …

Effects Of High-Interest Writing Prompts On Performance Of Students With Learning Disabilities By, Kelsey J. Chlarson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The following study was done to examine the extent to which high-interest narrative writing prompts for 12- to 13-year old students in special education increase accuracy and total words written (TWW) in a 3-min timed writing sample compared to low-interest writing prompts.

Students who will participate will be individuals from a sixth- and seventh-grade special education language arts class who have been classified with LD. In this study, participants select high-interest writing prompts as story starter topics as preferred prompts for writing tasks. Initially, participants will select high- and low-interest writing topics using a prompt selection procedure. Given 40 potential …

The Effects Of Early Identification And Intervention On Language Outcomes Of Children Born With Hearing Loss, Catherine A. Callow-Heusser

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study included a comprehensive review of the literature in which the effects of early identification of hearing loss and intervention on language outcomes were investigated. Previous reviews of studies were not comprehensive in their coverage and did not include a common measure for comparing results across studies. Without a more rigorous analysis of the primary research, conclusions drawn from these reviews are tenuous. The review of primary studies showed they exhibit many methodological problems including weak experimental designs, small sample sizes, attrition or questionable sample selection methods, differences in length of treatment and characteristics of the participants, and inadequate …

Assessment Of Colorado’S Wilderness Areas: Manager Perceptions And Remoteness Modeling, Gary D. Vaughn

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study assessed visitor use levels and resource and social conditions in wilderness areas across the State of Colorado using existing and collected spatial data. This is the first attempt to spatially assess wilderness conditions at the state level. A state-wide assessment of wilderness conditions allows local and regional managers to make informed regional decisions and to prioritize and direct their time and energy efficiently. This assessment clarifies the recreational use and impacts across the state. This study consists of two projects: 1) managers’ perceptions of the location and extent of resource and social condition problems; and 2) a geographic …

A Dynamic State Metabolic Journey: From Mass Spectrometry To Network Analysis Via Estimation Of Kinetic Parameters, Arockia Ranjitha Dhanasekaran

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The term "metabolism" refers to the chemical processes occurring in a living organism to convert the food consumed into the energy needed to maintain a living state. Metabolism consists of two states, namely, a dynamic state and a steady state. In the dynamic state, the rate of chemical conversion of a substance is proportional to the amount of substance available, whereas in the steady state this rate is constant and independent of the amount of substance present (Chapter 4 Figure 1). Like all other fields of engineering, metabolic engineering involves the analysis and synthesis of metabolism. Molecular biological tools for …

The Relationship Between Family Functioning, Family Resilience, And Quality Of Life Among Vocational Rehabilitation Clients, Kristi P. Openshaw

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

While there has been extensive research on the quality of life for people with disabilities, very little research has been conducted on the way in which families impact the quality of life of these individuals. This study focused on how family dynamics impact the quality of life for people with disabilities who are clients of state vocational rehabilitation agencies. Specifically, family flexibility and cohesion, as well as family resilience, were the independent variables; quality of life was the dependent variable.

It was found that family functioning and family resilience play an important role in the quality of life for people …

An Investigation Of The Doctoral Dissertation Literature Review: From The Materials We Use To Prepare Students, To The Materials That Students Prepare, Melynda H. Fitt

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

To reduce the risk of repeating prior research efforts or choosing incorrect research methods, a sound literature review should be performed before undertaking a new study. As such, the literature review occupies a well-defined role in the research process. It is natural to assume much research has been done in how these skills are taught to future scholars. However, this is not the case. Research in this area is limited and varied. This dissertation builds on existing efforts and fills in a portion of the missing research. This work examines some of the textbooks used to teach doctoral students literature …

Using Species Distribution Models To Assess Invasion Theory And Provide Management Recommendations For Riparian Areas In The Eastern Columbia And Western Missouri River Basins, Diane R. Menuz

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Globalization has created opportunities for plant and animal species to be transported to novel ecosystems. A subset of these species become invasive species, which are able to persist and spread rapidly to become influential components in their new ecosystems. Invasive species are often able to out-compete co-occurring native species and can alter fundamental ecosystem properties, such as soil nutrient availability or time between wildfires in a region. The United States is estimated to lose $34 billion per year to invasive plant species through costs to control unwanted species and lowered crop and forage production.

We used statistical models to better …

Reconstructing The Holocene Arroyo History Of The Upper Escalante River, Southern Utah, Using Optically Stimulated Luminescence (Osl) And Radiocarbon Dating, Anne E. Hayden

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Arroyos are steep-walled, entrenched, typically ephemeral streams commonly found in dryland river systems that form when streams incise into previously deposited alluvial fill. Arroyos in the southwestern U.S. have been studied extensively following the historic period of arroyo cutting in the late 1800s and early 1900s A.D. The upper Escalante River in south-central Utah similarly began incising in 1909, and records evidence for past cut and fill cycles in well-exposed walls along the now continuous arroyo.

Establishing robust geochronologies of past arroyo cycles in these fluvial settings has been difficult. Recent improvements in accelerator mass spectrometry (AMS) radiocarbon (^{14 …}

Accelerating Production Of Slow-Growing Intermountain West Native Plants By Modifying Their Microclimate, Sam A. Miller

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Water shortages are a recurring problem in the western US. As much as 70% of yearly municipal water consumption may be used to irrigate urban landscapes. Significant water savings can be realized by installing low water landscapes, where turfgrass is replaced by low water trees, shrubs, grasses, and perennials. Intermountain West (IMW) native trees and shrubs are excellent candidates for low water landscaping. However, due to their slow initial growth, many native trees and shrubs are simply unavailable to consumers, as they are not cost effective for nursery growers to produce. In an effort to accelerate the yearly growth rates …

Effect Of Voluntary Exercise And Diet On The Unfolded Protein Response In The Brain Of Mice, Yu Ho Kim

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The medical costs for many chronic diseases are increasing dramatically and placing a major financial burden on nations and individuals in both developed and developing countries. A number of chronic diseases, such as obesity, type 2 diabetes and some neurodegenerative diseases are all attenuated by a history of physical activity suggesting that they may be interconnected in some way. It has been suggested that cellular stress is a major factor promoting these chronic diseases.

Cellular stress occurs in a specific compartment within the cell, the endoplasmic reticulum, whose normal function is in the synthesis and folding of proteins into the …

Frequency Response Of A Gas-Filled Tube With Minor Losses, Brian M. West

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A thesis on the study of the frequency response of a pneumatic system designed to provide pulsed flow for flow control applications is presented. The system consists of a high pressure air source, a high-frequency solenoid valve, a length of tube and a minor loss. The experiment mimics the pneumatic drive for our Coanda-Assisted Spray Manipulation actuator and applies to many flow control applications involving pulsed flow. Square wave signals of various frequency are fed to the solenoid valve. The flow at the exit of the system is measured with a single hot wire and compared to steady flow through …

Measuring The Differences In Spatial Ability Between A Face-To-Face And A Synchronous Distance Education Undergraduate Engineering Graphics Course, Scott D. Greenhalgh

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A study was conducted in the Engineering and Technology Education Department at Utah State University by Scott Greenhalgh and Gary Stewardson to measure and compare a face-to-face engineering graphics course with a synchronous distance education engineering graphics course by identifying the impact of the teacher's physical presence on students' spatial ability. This study is unique because it involves laboratory classes in a science, technology, engineering, and math (STEM) field with greater emphasis on hands-on laboratory experiences and skills rather than mastery of information and knowledge. The potential for impact of the study extends beyond a few courses in a specific …

Air Demand In Low-Level Outlet Works, Jason Arthur Larchar

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Most dams have a low-level outlet that consists of a closed conduit through the dam with a slide gate or valve to regulate flow. These outlets are used mainly for irrigational purposes but also for flushing the reservoir and controlling the reservoir elevation. When discharging through the low-level outlet works, negative pressures can develop on the downstream side of the gate creating a potential for cavitation damage and vibration. To minimize these effects, air vents (vented to the atmosphere) are installed on the downstream side of the gate to limit downstream pressure to something above vapor pressure (i.e., near atmospheric …

Reduced Gravity Landing Research Vehicle Design, Sarah Isert

Undergraduate Honors Capstone Projects

Human and robotic missions beyond low earth orbit (LEO) are key components of NASA's currently emerging strategy for space exploration. These missions will inevitably include humancrewed lunar and planetary surface landings. Trips to near-earth asteroids are also in the incipient planning stages. A permanent presence on the surface of an extra terrestrial body like Mars or the Moon will require many landings by both human-crewed and robotic spacecraft.

Planetary and lunar surface landings are inherently dangerous undertakings, and successful landings are indeed rare events. Since the end of the Apollo era with the completion of the Apollo 17 mission in …

Genetic Status Of Isolated Populations Of Colorado River Cutthroat Trout (Oncorhynchus Clarkii Pleuriticus) In The North Fork Little Snake River Drainage, Wyoming, Rachel Van Horne

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Over the last century native cutthroat trout populations have declined in the western United States. Habitat fragmentation is one of the main causes for this decline. Human actions such as the construction of roads, weirs, dams, and water diversions intersect streams and prevent the natural movement of fish. In many cases native cutthroat trout are now confined to headwater streams above human-created barriers. These barriers not only fragment the populations but also increase the risk of individual population extinction.

This study established a baseline genetic structure for nine isolated populations of Colorado River cutthroat trout in the North Fork Little …