Digital Commons Network^™

Blind Front-End Processing Of Dynamic Multi-Channel Wideband Signals, Kevin Jackson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Society today relies heavily on the exchange of information via wireless communication. Such communication provides the means of transferring information from point A to point B over the air. In order to accomplish this, a minimum of two devices is required: a transmitter and a receiver. Just as people must speak the same language in order to communicate, the receiver must know how the transmitter communicates in order to make sense of the data being transmitted. For multiple wireless communication system to coexist, they must each speak a unique language, which in the communications world is referred to as modulation. …

Perceived Alzheimer's Disease Threat As A Predictor Of Behavior Change To Lower Disease Risk: The Gray Matters Study, Christine Clark

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Alzheimer’s disease is a growing public health concern with an estimated five million Americans currently afflicted. That number is projected to triple by 2050 as the baby boomer generation approaches age 65, the most common age where people begin to show symptoms of cognitive decline stemming from changes in the brain related to Alzheimer’s. Since there is currently no cure or preventive pharmacological treatment, AD prevention research is now recognized as an important enterprise. Modifiable lifestyle factors that can reduce AD risk or delay its onset have been identified as reasonable targets for behavioral intervention, including increased physical activity, healthier …

Benefits, Challenges, And Recommendations For Implementing A Sustainability-Based Service-Learning Program At Utah State University: An Initial Assessment Of The Community Bridge Initiative, Julie Koldewyn

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Service-Learning is a method of teaching that allows students to learn course content by engaging in real world applications, which can enhance student learning and benefit communities. As populations increase, many communities struggle with the corresponding issues of sustainability. A program that could use student expertise to address these concerns would be beneficial for both students and communities. This mixed-methods study explored the benefits, challenges, and recommendations for implementing a sustainability-based service-learning program, the Community Bridge Initiative (CBI), at Utah State University (USU) in relation to community needs and student responses to being in program pilot classes. Pilot classes were …

Separation Of Points And Interval Estimation In Mixed Dose-Response Curves With Selective Component Labeling, Darl D. Flake Ii

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Dose-response experiments are those that involve giving subjects different amounts of a treatment and observing the outcome. For example, plants may be given fertilizer and their growth could be measured or cancer patients could be given different doses of chemotherapy and their response could be monitored. These experiments are used to understand the relationship between the amount of, and response to, the treatment. Logistic regression models are often used to summarize data from these types of experiments. The dose-response experiment that motivated this dissertation involved treating a grain-pest with a pesticide. Some of the beetles had genes that made them …

Investigating The Effect Of Carbon Nanotube Functionalization In A Polydimethylsiloxane Composite Through Use Of A Stepped Bar Apparatus, Matthew I. Ralphs

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Thermal interface materials (TIMs) are used in transporting heat away from a circuit or electronic module. Composite materials are a popular research area for TIMs because they allow the desired properties to be joined in a composite to take advantage of the best properties from all the constituents involved. The composite selected for this study uses carbon nanotubes (CNT) as the filler and an elastomeric polymer for the matrix, specifically a multiwalled carbon nanotube (MWCNT) / polydimethylsiloxane (PDMS) composite. This study looks at chemical modification (functionalization) of the CNTin an effort to produce a better bond between the CNT and …

Staff Interactions And Affect In Persons With Dementia: An Observational Study Of A Memory Care Unit, Keirstin V. Meyer

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

It is estimated that the number of people in the United States living with dementia in 2015 will nearly triple by the year 2050. With no cure for dementia, we are faced with providing care in a way that maximizes well-being. The majority of prior research focused on the best ways to reduce behavioral problems and mood disorders, such as depression and anxiety. The objective of this study was to increase knowledge about the social influences on well-being in persons with dementia, particularly from staff in residential memory care units. This study found that the most common interaction type from …

Effects Of A Self-Management Procedure Using Student Feedback On Staff Members' Use Of Praise In An Out-Of-School Time Program, Cade T. Charlton

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Out-of-school time (OST) programs are under increasing pressure to improve student achievement. However, OST program administrators face a number of challenges to improving program effectiveness including inconsistent student participation, inexperienced staff members, and a lack of high-quality professional development. OST program administrators can address these challenges by implementing staff development practices that encourage the use of effective instructional strategies.

Specific praise is a simple and effective instructional strategy that has been linked to improved student engagement, enhanced academic achievement, and stronger student-teacher relationships. Unfortunately, there have been very few studies examining the effects of interventions designed to increase OST staff …

Thermal Property Measurement Of Thin Fibers By Complementary Methods, Troy Robert Munro

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Thin fibers are prevalent in many engineering materials. Measuring how well heat transfers in such small fibers can be difficult to determine, and previous methods have led to erroneous results. This dissertation details three proposed methods to improve the measurement of the thermal conductivity, thermal diffusivity, and volumetric heat capacity of thin fibers. Of particular interest is natural and synthetic spider silks because previously published values of the natural silk thermal conductivity was similar to copper, an excellent thermal conductor.

The three methods developed are the improved transient electrothermal technique (which was redeveloped to include radiation and convection heat losses …

A Study Of The Pedagogical And Structural Elements Being Incorporated Into The Design Of Hybrid Courses For Higher Education, Deborah Kezerian Baird

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study examined a new course design for teaching adults in higher education. Increasingly referred to as the hybrid course format, it entails purposefully dividing a course into face-to-face class sessions and online class sessions in separately calendared periods. Hybrid courses are a specific iteration of a broader category of courses that utilize technology in many configurations. Research into the potential for the hybrid format to be a highly effective way of teaching adults was found to be new and fragmented.

Adult education theories, including the andragogy model, the self-directed learning model, the transformative learning model and the experiential learning …

Comparing Conventional And Noninvasive Monitoring Techniques For Assessing Cougar Population Size In The Southern Greater Yellowstone Ecosystem, Peter D. Alexander

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Determining the abundance or density of wildlife populations is needed for informed decision-making by wildlife biologists. Cougars (Puma concolor), however, are a highly secretive species occurring at very low densities across the landscape, and thus their populations are difficult for biologists to accurately assess. The conventional, and most trusted, method entails physically trapping and radio-collaring as many cougars as possible in a population, and then performing a simple count to determine a minimum population size. While accurate, this method is prohibitively expensive, logistically challenging, and behaviorally disruptive to the study animal. Many noninvasive surveying techniques, such as camera …

Anaerobic Hydrogen And Methane Production From Dairy Processing Waste: Experiment And Modeling, Jianming Zhong

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Dairy processing waste (DPW) is the waste produced from manufacturing dairy products: cheese, yogurt, ice cream, milk, butter, etc. DPW is high in chemical oxygen demand (COD) due to its lactose, fat and protein content, and therefore needs to be appropriately treated. An investigation was conducted to produce energy (hydrogen and methane) from DPW by anaerobic digestion. This project developed an effective engineering method for stable methane production from DPW without adding pH control chemicals. This study also explored the optimal operational condition for hydrogen production from DPW. We further built a mathematical model to help us monitor and predict …

Effects Of Thermosonication On Microbial Population Reduction And Solubility Index In Skim Milk Powder, Nicola F. Beatty

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Thermosonication has been researched as a means to improve shelf life, quality, and functional properties in dairy products. This study explored the effects of thermosonication on the inactivation of Geobacillus stearothermophilus in concentrated skim milk as a function of total solids content, temperature, and time and investigated changes in the solubility of the skim milk. Results showed thermosonication had an increased bactericidal effect on both vegetative cells and spores as compared to heat treatment alone without affecting solubility. A model was developed using response surface analysis showing that log reductions produced by thermosonication can be predicted based on a polynomial …

Entrepreneurs' Perceived Factors Of Success And Barriers-To-Entry For Small Business And Farm Operations In Rural Paraguay, Braden J. Jensen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Both agriculture and nonagriculture activities are important for Paraguay's economy and its rural development plan. Ensuring opportunity for successful enterprise creation and expansion will facilitate new business entrance, while also growing rural economies. Past research has identified many factors that contribute highly to business and farm operation success, though little information exists about the perceptions of would-be entrepreneurs.

This study analyzes perceptions and characteristics of young, would-be entrepreneurs and agriculture producers in rural Paraguay to better understand their views of business/farm success and hurdle factors. Results suggest that increased experience, education and business exposure will decrease perceptions of many barrier …

Europa's Bane Ethnic Conflict And Economics On The Czechoslovak Path From Nationalism To Communism, 1848-1948, Mathias Fuelling

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Ethnic conflict and its relationship with economics is a difficult subject to understand, both for moral and historical reasons. This thesis was written with a mind to the effects of these forces on the functioning of political systems. Through study of the Habsburg empire it was discovered that industrialization and competition over economic opportunities drove speakers of different languages to establish themselves as distinct ethnic communities who held conflict between each other as a virtue. This conflict and the creation of a nationalist narrative by communities of Czechs and Germans contributed to the breakup of the Habsburg empire. Conceptions of …

Effect Of Chronic Administration Of Oxytocin On Corpus Luteum Function In Cycling Mares, Katherine Clissold Parkinson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Undesirable and variable behavior in mares related to the reproductive cycle is a common issue reported in the equine industry, especially for female horses in a performance setting. These behaviors can interfere with and decrease, overall performance. The objective of this study was to determine if administration of 60 units of the hormone oxytocin once daily for 29 days, regardless of when treatment was initiated during the estrous cycle, would induce prolonged corpus luteum function in cycling mares. Mares were randomly assigned to two groups: 1) saline-treated control (n=7) and 2) oxytocin-treated (n=9). Control mares received 3 cc saline and …

Three Essays On Big-Box Retailers And Regional Economics, Denis Peralta

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Throughout the years, big-box retail stores such as Wal-Mart and Target have become the focus of many studies researching their impacts on local economic outcomes (i.e. employment, wages, poverty level, food prices, etc.) within specific regions, states, counties and localities in the U.S. This dissertation covers three closely related topics in regional science: (i) the dynamic interrelationship among the presence of the big-box stores, retail wage, and employment, (ii) the impact of the big-box retailers on personal income growth, and (iii) the dynamic interrelationship between the presence of the big-box retailers and personal income growth. The research draws important insights …

A Spatiotemporal Mountain Pine Beetle Outbreak Model Predicting Severity, Cycle Period, And Invasion Speed, Jacob P. Duncan

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The mountain pine beetle (MPB, Dendroctonus ponderosae), a tree-killing bark beetle, has historically been part of the normal disturbance regime in lodgepole pine (Pinus contorta) forests. In recent years, warm winters and summers have allowed MPB populations to achieve synchronous emergence and successful attacks, resulting in widespread population outbreaks and resultant tree mortality across western North America. We develop an age-structured forest demographic model that incorporates temperature-dependent MPB infestations: the Susceptible-Infested-Juvenile (SIJ) model. Stability of equilibria is analyzed as a function of population growth rates, and indicates the existence of periodic outbreaks that intensify as growth rates …

Investigation Of The Tailoring Steps In Pradimicin Biosynthesis, Kandy L. Napan

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This research focused on the investigation of the late steps in the biosynthetic pathway of the novel antifungal and antiviral pradimicins A-C. Pradimicins were first isolated from the soil bacterium Actinomadura hibisca. These bioactive molecules are assembled by a type II polyketide biosynthetic pathway. Although the biosynthetic gene cluster of pradimicin has been identified, the functions of the biosynthetic genes and how they work collaboratively to form the final structures of pradimicins remain unknown. This research aims to functionally characterize the enzymes involved in the late steps of the biosynthetic route.

The early biosynthetic steps of pradimicins have been …

What In A Good Cause Men May Both Dare And Venture, Karen Schwarze

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In this thesis, I present a short story in the historical fiction genre. I researched the plight of Bavarian schoolteachers during the 1848 revolution and integrated this historical information into the story. The Cultural Minister at the time, Karl von Abel, had instituted strict measures against schoolteachers. For example, they were forbidden to read certain books (a key element in the story), attend taverns, and meet outside of regulated teachers conferences. Teachers also were denied civil servant status, which meant that no pension was available to them.

In my short story, the main character, Franz Schuler, must decide whether or …

Traffic Sign Management: Data Integration And Analysis Methods For Mobile Lidar And Digital Photolog Big Data, Majid Khalilikhah

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Traffic signs often convey critical information to drivers. However, traffic signs are only effective when clearly visible and legible. This study aims to determine the effects of various damage and deterioration forms on sign retroreflectivity, identify the most important factors affecting traffic sign visual condition, predict traffic sign vandalism that obstructs critical messages to drivers, and identify important environmental factors contributing to the temporary obstruction of the sign messages. To do so, two data sets are used. A sample data of over 1,700 signs was manually collected in the field, and the background retroreflectivity of each sign was measured using …

Interpreting Risk: Variations And Explanations Of Resident Perceptions Of Hydraulic Fracturing Impacts, Adrian B. Uzunian

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Hydraulic fracturing has increasingly become a global phenomenon that has induced the public to be suspicious of the impacts of this process. As this new process has been fraught with controversy, it is important to gain further understanding of how different people perceive the risks associated with oil and gas development. Focusing on the Eagle Ford Shale region, located in South Texas, I examine how social position and source of information is related to perception of environmental and health risks. I do this by conducting a qualitative analysis of interviews from two counties experiencing hydraulic fracturing development, examining the most …

Motionscan: Towards Brain Concussion Detection With A Mobile Tablet Device, Shantanu Saxena

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis reports on a study to determine the viability of using a mobile tablet device as a brain concussion detection tool. The research builds upon the results of a prior method of collecting data for measuring motion sensitivity, where a user presses and releases a force sensor to balance a rising and falling line on a computer display. The motion sensitivity data collected using this force sensor device was shown to have less irregularity in persons with concussion. The MotionScan application, developed for this research, uses the accelerometer of a tablet device to record motor movement of a user …

Intraspecific Variation In The Response Of Elymus Elymoides To Competition From Bromus Tectorum, Rebecca K. Mann

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

In the western United States, thousands of acres of degraded rangelands are dominated by aggressive invasive species such as cheatgrass (Bromus tectorum), and are seeded by managers with native plants in an attempt to restore species diversity, wildlife habitat, and ecosystem services. There are many options for obtaining seeds of native plants; for instance, they can be collected from the region where restoration is to occur, or they may be purchased through commercial producers. For a given plant species, managers may also select seeds from unique subspecies, cultivars, and populations. Genetic differentiation among these within-species groups can not only affect …

Benefits, Barriers, And Opportunities For Renewable Energy Outreach In Extension: A Mixed-Methods Needs Assessment, Blake H. Thomas

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Renewable energy is energy from a source that is not depleted when used, such as solar, wind, geothermal, biofuel, and hydroelectric power. Renewable energy sources are a powerful combatant to climate change because they emit little to no carbon dioxide emissions in the electrical generation process. This mixed-methods needs assessment explored the benefits, barriers, and opportunities for renewable energy outreach in Extension on a nationwide and Utah-based scale. Two online surveys and focus group interviews revealed the relative dearth of renewable energy programming currently underway in Extension nationwide. In Utah, more than fifty-five percent of Utah State University (USU) Extension …

Rudder Augmented Trajectory Correction For Unmanned Aerial Vehicles To Decrease Lateral Image Errors Of Fixed Camera Payloads, Thomas M. Fisher

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

When using small unmanned aerial vehicles (UAVs) with cameras onboard for ground surveying, two competing problems arise. First is the desire to keep the camera sensor parallel with the ground and second is to maintain the proper flight path. When the cameras are physically fixed to the UAV and as the plane banks to maintain the desired path, the camera sensor is no longer kept parallel with the ground. This thesis focuses on a method called rudder augmented trajectory correction that allows for flat turns instead of banking the aircraft. Because of this, the camera is able to stay parallel …

Effects Of Carboxymethyl-Lysine In Heat Processed Foods On The Plasma Metabolome In Mice, Zhou Fang

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Carboxymethyl-lysine (CML), an advanced glycation end product (AGEs), is formed during the cooking process and may induce toxic effects on human health. The effect of dietary CML on the plasma metabolite profile was investigated. Mice were fed with one of five different diets: AIN93 diet (negative control), a 45% kcal from fat Diet Induced Obesity diet (DIO; positive control); CML0, TWD (Total Western Diet) with low CML; CML1, TWD with medium CML, and CML2, TWD with high CML for 8 weeks, and the plasma metabolome was determined by Gas Chromatography-Mass Spectrometry (GC-MS). In addition quantitative analysis of plasma glucose level …

The Market Potential For Food And Agricultural Tourism In Utah, Miranda Bradshaw

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Tourism is one of the largest and most economically important industries in Utah. Local businesses and government agencies may increase their tourism-related profits through targeted marketing and product development. As tourists may differ from one another in terms of trip planning, party size, the activities they participate in, and more, it is important to understand who tourists are. The primary research purpose of this study was to explore and better understand the different types of tourists who visit Utah.

Data on tourists were collected through an in-person survey. This data was then used to place tourists into groups according to …

Low-Temperature Aqueous Corrosion Behavior Of Uranium Molybdenum Alloys, Levi D. Gardner

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Nuclear fuel characterization requires understanding of the various conditions to which materials are exposed in-reactor. One of these important conditions is corrosion, particularly that of fuel constituents. Therefore, corrosion behavior is of special interest and an essential part of nuclear materials characterization efforts. In support of the Office of Material Management and Minimization’s Reactor Conversion Program, monolithic uranium-10 wt% molybdenum alloy (UMo) is being investigated as a low enriched uranium alternative to highly enriched uranium dispersion fuel currently used in domestic high performance research reactors. The aqueous corrosion behavior of U-Mo is being examined at Pacific Northwest National Laboratory (PNNL) …

An Investigation Of Clinically Significant Change Among Child And Adolescent Clients Of A Graduate-Level Training Clinic, Kerry K. Prout

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The study examined parent-reported child and adolescent outcomes for youth being seen for psychotherapy services on a measure of symptoms of distress (Youth-Outcome Questionnaire 2.01). All clients were seen for psychotherapy services by graduate-level student therapists who were currently in training at a psychology training clinic. Parents of clients completed a questionnaire to assess symptoms of distress at each psychotherapy visit and the study sought to define the trajectory of change that clients experience throughout treatment. Specifically, the study aimed to determine to what degree change in outcomes was statistically significant and meaningful for clients and on average, how many …

Incorporating A Training Construct Into The Unified Theory Of Acceptance And Use Of Technology, Matthew E. Harris

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this study was to determine if a prominent theoretical model, the Unified Theory of Acceptance and Use of Technology (UTAUT), which is used to predict the likelihood that users would adopt a given technology, could be improved by adding a training reactions component as outlined in prominent training theory.

Online pre- and post-training surveys were received from 111 students who participated in face-to-face training on Structured Query Language (SQL) during spring 2014 and 2015 semesters. Survey questions were created from previously validated technology acceptance and training studies. From these responses, the basic structure of the original UTAUT …