Digital Commons Network^™

Machine Learning Enhanced Free-Space And Underwater Oam Optical Communications, Patrick L. Neary

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Communications, bandwidth, security, and hardware simplicity are principles of interest to society at large. Recent advances in optics and in understanding properties of light, such as orbital angular momentum (OAM), have provided new potential mediums for communication.

Machine learning has wound its way into a broad range of fascinating areas. An emerging field of research is the use of a unique property of lasers called orbital angular momentum (OAM). With the proper hardware, a laser can go from a Gaussian shaped distribution to a doughnut shaped pattern, where the radius can be changed. Multiple OAM patterns, or modes, can be …

Exploring The Influence Of Peer-Assisted Learning Strategies (Pals) In Increasing Reading Comprehension Of Grade-Level Biology Text And Biology Self-Efficacy In Students With Learning Disabilities: A Formative Experiment, K. Lea Priestley

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The present study used a formative design experiment framework which does not answer a research question but addresses a pedagogical goal. The goal of this study was to determine the influence of Peer-Assisted Learning Strategies (PALS) on the reading comprehension of grade-level biology text and biology self-efficacy with students diagnosed with learning disabilities. As a result of this intervention, it was expected that students would better understand biology text and feel better about themselves as a biology student.

Students were separated into pairs, or dyads, with each pair having a stronger reader and a weaker reader. These dyads participated in …

Impacts Of Tourism On The Ecophysiology Of The Endangered Northern Bahamian Rock Iguana (Cyclura Cychlura), Alison C. Webb

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Increased interest in ecotourism over recent years has led to more direct human-animal interactions and a striking concomitant increase in the provisioning of non-natural food, that may have unintended consequences for the wildlife involved. The critically endangered Northern Bahamian Rock Iguana provides a valuable model to address the potential impact of food provisioning on health as there are populations that represent a graded variation in human presence, with sites experiencing high, low, or no tourism. To assess the potential impacts of tourism on iguana physiology I first reviewed the relevant literature on iguana physiology and then performed three investigations focusing …

Social Justice Mathematical Modeling For Teacher Preparation, Patrick L. Seegmiller

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Today's math teachers face significant social and political challenges for which they receive little preparation. Mathematics content courses can potentially provide additional preparation in this regard by providing future teachers with experiences to mathematically explore social justice issues. This provides them with opportunities to increase their awareness and sensitivity to social justice issues, develop greater empathy for their future students, and serve as examples for high quality instruction that they can emulate in their future careers. This dissertation recounts the development and revision of three social justice mathematical modeling projects, and shares evidence from student work samples of the ways …

Solar Irradiance Prediction Using Xg-Boost With The Numerical Weather Forecast, Pratyusha Sai Kamarouthu

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

To defeat global warming, the world expects to look at renewable energy sources. Solar energy is one of the best renewable energy sources which causes no harm to the environment. As solar energy changes with atmospheric parameters like temperature, relative humidity, cloud coverage, dewpoint, sun position, day of the year, etc. It is difficult to understand its nature by science. Predicting solar irradiance which is directly proportional to solar energy using atmospheric parameters is the main goal of this work. Powerful artificial intelligence algorithms that won many coding competitions have been used to predict it. Using these methods and numerical …

Anti-State Criminal Violence As Civil Defense, Tyler S. Thomas

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Anti-state criminal violence is a puzzle. Criminal organizations should avoid violent interactions with the state, yet in several countries like Brazil, Mexico, and Colombia there has been widespread anti-state violence orchestrated by organized criminal groups for the past 25 years. Why?

Building on existing literature, I develop a theory with which to explain anti-state criminal violence. I argue that organized crime is more likely to commit anti-state violence when state enforcement agents commit a serious grievance against the local population with whom the criminals share a social identity. I develop this theory using the case of the Michoacán Family, later …

Cultural And Contextual Influences On Mental Health, Stigma, And Substance Use Among Mena U.S. College Students, Molly Mechammil

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The aim of this dissertation was to investigate whether certain cultural and contextual factors influence Middle Eastern/North African (MENA) college students' mental health, alcohol/marijuana use, and experiences with mental health stigma and help seeking. Research with MENA college students is very limited, which leaves mental health providers with limited information on how to best support MENAs. MENAs report high rates of discrimination, and other research shows that many they may use religion as a way to cope with stressors such as discrimination. I examined whether religious coping might buffer the effects of discrimination on mental health outcomes. I also considered …

A Translational Investigation Of Reinforced Behavioral Variability: Implications For Promoting Behavioral Variability In Individuals With Autism Spectrum Disorder, Ann Galizio

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Behavioral variability is sometimes adaptive and can be maintained by the delivery of reinforcement. Individuals with autism spectrum disorder (ASD) often show restricted and repetitive behaviors. Therefore, interventions to promote behavioral variability in individuals with ASD are needed. The present line of research was designed to inform such interventions by investigating reinforced behavioral variability from basic, applied, and translational perspectives. Each of these laboratory studies involved participants making sequences of well-defined responses, which were compared to previous responses. Responses that meet a variability contingency (i.e., were sufficiently different from previous responses) produced rewards. Studies 1 and 2 were basic experiments, …

Developing And Validating Stealth Assessments For An Educational Game To Assess Young Dual Language Immersion Learners' Reading Comprehension, Frederick J. Poole

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this multiple-paper dissertation is to design a digital game and stealth assessments within the game to assess young second language learners' Chinese reading proficiency. In Chapter 2 (Paper 1), I describe the game designed for this dissertation and how it was implemented in a dual language immersion classroom. This study found that the digital game and in-class implementation led to significant vocabulary and reading comprehension gains. Further, seven types of support that students needed while playing the game were identified. In Chapter 3 (Paper 2), I describe how educational data mining approaches, and more specifically, how data-driven …

Kudos And K.O.M.'S: The Effect Of Strava Use On Evaluations Of Social And Managerial Conditions, Perceptions Of Ecological Impacts, And Mountain Bike Spatial Behavior, Noah E. Creany

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Smartphone based self-tracking fitness applications (apps) like Strava are increasingly becoming a part of recreation experiences in parks and protected areas (PPAs). Recreation research has employed smartphone GPS tracking (SGT) and volunteered geographic information (VGI) to study visitor behavior in PPAs, but little is understood about how smartphones or fitness apps affect visitor perceptions and behavior during their experience.

The first chapter of this thesis is a literature review of recreation survey and behavior research, social-psychology and technology use theory, gamification, and mountain bike social science and recreation-ecology research. The second chapter is formatted for submission to the Journal of …

Improving Aquatic Habitat Representation In Utah Using Large Spatial Scale Environmental Datasets, Gregory C. Goodrum

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Rivers provide habitat for aquatic species, but widespread human water development degrades aquatic habitat, fragments stream networks, and threatens native fish populations. Habitat suitability models are commonly used to identify current instream habitat conditions, but are often species-specific, data-intensive, and rarely suitable to the large spatial scales required in conservation and water resources management. Thus, there is need to develop and validate habitat suitability models that provide ecologically-meaningful estimations of aquatic habitat, but are simple enough to apply at large geographic areas and flexible to incorporate different species. I tested the accuracy of 15 habitat suitability models estimating Bonneville Cutthroat …

Greening-Induced Runoff Loss In The Western United States, Xueyan Zhang

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study assessed how vegetation will influence long-term runoff trends across the western United States (western US) in the future. I used a land surface model with improved dynamic vegetation root processes to better quantify regional runoff trends across five regions (Upper and Lower Colorado, Great Basin, Pacific Northwest, and California). The model was driven by statistically downscaled and bias-corrected outputs from three global climate models under the Representative Concentration Pathway 4.5 and 8.5 scenarios. Vegetation greening dominated significant transpiration increases that contributed most to increasing evapotranspiration across the western US, especially during spring and summer. Consistent with these trends, …

Framing Climate Change In Local Context: Newspaper Coverage Of Climate Change In Three Mountain Towns In The Intermountain West Compared To National Coverage, Tyler J. Spradlin

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Past research has focused on how journalists cover and frame the issue of climate change or global warming in mainly nationally circulated newspapers. This study compares and contrasts the framing of climate change between two nationally circulated newspapers, The New York Times and The Washington Post, and three intermountain west community newspapers, Jackson Hole News & Guide in Jackson Hole, WY, Summit Daily in Summit County, CO, and Park Record in Park City, UT. This research incorporates the five generic frames, responsibility, conflict, human-interest, economic consequences, and morality frames defined by Semetko and Valkenburg (2000) …

Harmonic Delay Reduction, Jay E. Hinnenkamp

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Stimuli which, during the life of an organism, acquire the ability to increase the probability of behavior that they follow are called conditioned reinforcers. The concurrent-chains procedure has been used to study conditioned reinforcement for over 60 years. During this time several different models have been developed to explain how stimuli become conditioned reinforcers. The three experiments of this dissertation introduced a new quantitative model of conditioned reinforcement (DRT_H) and tested its predictions against four existing models. The results of Experiment 1 indicated that DRT_H improves upon the accuracy of its predecessor, delay reduction theory (Fantino, 1969), …

Trisiloxane Surfactant Adjuvants In Pollen, Autumn Slade

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Chemicals are often added to agricultural pesticide mixes to help increase the efficiency of the field spray solution, and one of the main groups of chemicals used for this purpose are trisiloxane surfactants (TSSs). Normally TSSs are considered non-toxic, but recent studies have shown TSSs to have negative impacts on organisms like honey bees. Though TSSs have recently been found in environmental sources like water, pollen, and beeswax, little is known about how TSSs behave in the environment or affects active ingredients, like pesticides.

To help determine the environmental prevalence and fate of TSSs, several studies were performed. Pollen was …

Effect Of Long Pasteurization Run Times On Bacterial Numbers In Milk, Brynli Tattersall

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This project was funded by the Western Dairy Center to understand how long a milk pasteurizer can be operated before increases in bacterial numbers are observed in the pasteurized milk. While pasteurization kills pathogenic bacteria there are some non-pathogenic bacteria that can survive and have the ability to become attached to the surfaces in the cooling sections of the pasteurizer. Some bacteria can also produce spores that survive pasteurization even if the bacterial cells are killed. Temperatures in the cooling section remain in a range suitable for growth of these heat-tolerant bacteria and can allow germination of bacterial spores. While …

Pitched Baseballs And The Seam Shifted Wake, Andrew W. Smith

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

An experiment was conducted to investigate the effect that seams have on the way a baseball moves through the air. An examination of the airflow around a baseball led to the understanding that when seams are in certain areas on the baseball's surface the airflow changes. A subsequent experiment was performed which showed that when these changes in airflow were on one side of the baseball more than the other, the ball moved away from the side with the seams. This movement is in a different direction than the movement direction caused by a ball's spin. These experiments were done …

Evaluation Of Best Practices For Urban Water Conservation And Water-Smart Growth Implementation In Utah, J. Ivy Harvey Thomson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Policies and programs have been utilized throughout the United States (U.S.) to reduce water use as a strategy to ensure sufficient water supplies for future demand. As governmental leaders and policy makers face increasing freshwater scarcity and supply unpredictability, along with rising costs and decreased federal funding, Best Practices (BPs) in water conservation are increasingly important to facilitate decision-making in choosing which strategies to employ. This project uses policy analysis to review and summarize various BPs, referencing both academic and professional literature. National fixture efficiency standards enacted in 1992 are credited as among the leading factors reducing indoor water use …

Load Forecasting Analysis Using Contextual Data And Integration With Microgrids Used For Off Grid Ev Charging Stations, Ashit Neema

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Electricity is an essential component of the smooth working of every sector. If a successful prediction of how much electricity will be required for say the next 24 hours or 48 hours can be made, it will not only help in efficiently planning the activities and operations but also help in minimizing the cost incurred. In this thesis the same is being attempted, first, a model is created that can predict the energy consumption of households using various tools available. To achieve this, historical data of the past 5 years that has been recorded in London has been used. Secondly, …

Massive Graviton Spectra In Supergravity, Kevin Dimmitt

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Development of a unified theory of physics would pave the way for new research and technology development for many years to come. Unfortunately, the two best current theories explaining nature, the Standard Model of particle physics and general relativity, do not seem to be compatible, requiring the development of more complicated models which contains both of these at their respective limits. Supergravities are one set of theories which may, at least in part, provide hints as to how it may be possible to unify physics into a single model.

This research project follows from a line of investigation which the …

Ecoacoustic Methods For Multi-Taxa Animal Surveys In The Amazon, Leandro A. Do Nascimento

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Tropical regions host most of the biodiversity found on Earth, but these species-rich areas are constantly threatened by human development and other disturbances that put this diversity of life forms at risk. To avoid extirpations of animal and plant species, scientists and managers rely on accurate monitoring techniques to retrieve information about population trends. This task is not easy, especially in the tropics, where there is often a lack of personnel to conduct surveys, a lack of funding, and the areas are so extensive that many countries need to be involved in monitoring (e.g., Amazon biome). For this reason, scientists …

Patterns Of Microbial Diversity And Community Composition In Slot Canyons, Rock Pools, And Other Ephemeral And Perennial Aquatic Habitats, Marley Madsen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Microbes are the most diverse life forms on the planet and perform many impor-tant ecological functions. However, despite the abundance, diversity, and ecological importance of microbes they are often overlooked and understudied in many natural systems, including freshwater habitats. This thesis details the first ever investigation of the microbial diversity and community composition within fresh water rock pools and slot canyons of the Colorado Plateau, Utah. The purpose of the study was to determine the relative importance of various microbial community assembly processes. This thesis also includes a meta-analysis of the microbial alpha diversity in other perennial and ephemeral aquatic …

Perceptions And Behavioral Intentions Of Utah 4-H Equine Program Leaders In Teaching Equine Safety To Youth, Katelyn M. Huffman

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

There is an inherent risk associated with working with youth and large equine. The Utah 4-H Equine program is a volunteer-based program that seeks to properly educate youth on equine husbandry, this includes the topic of safe equine handling practices. The purpose of this study was to explore the perceptions and behavioral intentions of Utah 4-H Equine Program leaders about teaching equine safety, including attitudes, perceived behavioral controls and subjective norms. The survey instrument consisted of multiple choice, fill in the blank, and six-point Likert scale questions regarding personal demographics, experience teaching equine safety, attitudes towards safety, perceived behavioral controls, …

Exploring Park Quality In Urban Setting With Environmental Justice, Alternative Measurements, And Social Interaction, Shuolei Chen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

With rapid urbanization, urban green resources, such as parks have become important assets for quality of life in urban settings. Parks provide urban residents with both physical and psychological health benefits through various mechanisms such as physical activity and social interaction. Quality is an important non-spatial dimension of urban parks and has started to gain attention among researchers. To better understand park quality in an urban setting, additional knowledge should be explored. This dissertation studies the quality of urban parks from three different perspectives: 1) the equal distribution of park quality resources and its relationship to environmental justice issues, 2) …

The Utility Of Environmental Dna And Species Distribution Models In Assessing The Habitat Requirements Of Twelve Fish Species In Alaskan North Slope Rivers, James B. Eddings

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Subsistence fishing is a vital component of Alaska’s North Slope borough economy and culture that is being threatened by human disturbance. These threats mean the fish must be protected, but the size of the region makes conservation planning difficult. Fortunately, advances in species distribution models (SDMs), environmental DNA (eDNA), and remote sensing technologies provide potential to better understand species’ needs and guide management. The objectives of my study were to: (1) map the current habitat suitability for twelve fish species, occurring in Alaska’s North Slope, (2) determine if SDMs based on eDNA data performed similarly to, or improved, models based …

A Temporal Information-Theoretic Model Of Suboptimal Choice, Paul J. Cunningham

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Humans and animals often make decisions not in their long-term best interest. In one example, called suboptimal choice, pigeons sacrifice food for food-predictive stimuli. The study of suboptimal choice can reveal insights into the role of reward-predictive stimuli in maladaptive decision-making that characterizes numerous behavioral disorders. However, there is currently little evidence that rats engage in suboptimal choice, thereby raising questions about the species-generality of suboptimal choice. According to the temporal information-theoretic model, developed in Chapter 2, suboptimal choice emerges when pigeons pay more attention to the bits of temporal information conveyed by food-predictive stimuli than the rate of food …

Command, Control, And Telemetry For Utah State University's Scintillation Prediction Observation Research Task (Sport) Mission, Jordan Haws

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Scintillation Prediction Observation Research Task (SPORT) is a joint United States of America (USA) and Brazil small satellite mission to address the further understanding of the preconditions leading to equatorial plasma bubbles. Utah State University (USU) is supplying four instruments towards this SPORT mission. These four instruments will allow measurements of the electric field and plasma density in the ionosphere which will help understand what gives rise to plasma bubbles in the ionosphere.

This thesis will discuss the command, control, and telemetry communications needed to operate the SPORT USU instruments. It will cover an overview of the instruments involved, …

Development And Validation Of A Synchronous Model To Simulate Skeletal Muscle Damage Due To Spaceflight Ionizing Radiation And Microgravity, Lori M. Caldwell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Astronauts traveling or researching in space are subject to a harsh environment that includes high levels of ionizing radiation and microgravity. Ionizing radiation is dangerous to overall health because it causes double-stranded DNA breaks, increases the production of free radicals or reactive oxygen species, and leads to an enhanced risk of cardiovascular disease and cancer over a person’s lifetime. Similarly, microgravity is hazardous to astronaut health because humans require gravity to maintain a healthy heart and muscular and vascular systems.

Both ionizing radiation and microgravity have been studied individually in previous research, but there is a lack of information on …

Interspecific Differences In Stressor Tolerance Drive Community-Level Changes In A Small Aquatic Ecosystem, Jennifer M. Weathered

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The global human population is expected to reach 9.8 billion by 2050 and an increase in food yield will be needed to provide for the future generations. Insects are among the biggest threats to food production and are therefore the subject of intense chemical control through the application of pesticides. The ability of insects to evolve resistance to pesticides after repeated use has been documented. However, how evolved responses affect individuals’ behaviors, their interactions with others, and how these factors impact overall patterns in distribution remains relatively unexplored in the bromeliad.

The aquatic insect communities housed in water-holding tropical plants …

Diversity And Inclusion In Technical And Professional Communication Academic Programs, Chris Dayley

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

With the recent social justice turn in technical and professional communication (TPC) scholarship, researchers have begun to focus their attention on issues of diversity and inclusion. Increasing diversity and inclusion in the field of technical and professional communication starts with TPC academic programs. This dissertation reports the results of qualitative interviews conducted with five undergraduate students, six graduate students, and five pre-tenure faculty who study TPC and identify as persons of color as well as six influencers identified by research participants. Interview participants discuss reasons why they chose TPC as a major, obstacles to discovering TPC academic programs, the importance …