Digital Commons Network^™

Development And Testing Of Additively Manufactured Aerospike Nozzles For Small Satellite Propulsion, Isaac W. Armstrong

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Automatic altitude compensation has been a holy grail of rocket propulsion for decades. Current state-of-the-art bell nozzles see large performance decreases at low altitudes, limiting rocket designs, shrinking payloads, and overall increasing costs. Aerospike nozzles are an old idea from the 1960’s that provide superior altitude-compensating performance and enhanced performance in vacuum, but have survivability issues that have stopped their application in satellite propulsion systems. A growing need for CubeSat propulsion systems provides the impetus to study aerospike nozzles in this application. This study built two aerospike nozzles using modern 3D metal printing techniques to test aerospikes at a size …

Empathy In The Middle-School History Classroom: The Effects Of Reading Different Historical Texts On Theory Of Mind, Empathic Concern, And Historical Perspective-Taking, Jared P. Collette

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Theoretical and empirical evidence indicate a possibility that reading certain types of historical texts could improve different constructs of empathy that include theory of mind (ToM), empathic concern (EC), and historical perspective-taking (HPT).The objective of this study was to compare the effect of reading a collection of primary documents in comparison to a historical narrative on ToM, HPT, and EC for adolescents in an eighth-grade history class. Students were randomly assigned to read either a historical narrative or a collection of adapted historical documents with approximately the same length, and reading level. This researcher controlled for student comprehension scores, ToM …

Juxtaposition At 45 Km Of Temperatures From Rayleigh-Scatter Lidar And Reanalysis Models, David K. Moser

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Weather and climate forecasts are almost exclusively produced by computer models, which use atmospheric measurements as starting points. It is a well-known and joked-about fact that model predictions can be incorrect at times. One of the reasons this happens is due to gaps in our knowledge of atmospheric conditions in areas where measurements don’t often taken place, such as the mesosphere, which stretches from roughly 45-90 km altitude.

A lidar is a device that can shoot out short bursts of laser light to measure things such as atmospheric thickness at a distance. From this information one can then derive the …

Standards-Based Grading: A Correlational Study Between Grades And End-Of-Level Test Scores, Tyler R. Poll

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

As students move from grade level to grade level and onto college, their grades have an impact on the number of opportunities available to students. The competition for entering college and earning a scholarship are at an all-time high and the grades students earn have a direct impact on future opportunities. Grading practices vary by teacher causing students’ grades to mean different things.

Standards-based grading practices focus on removing teacher bias and puts emphasis on the learning students can demonstrate. Students are given assessments to determine learning and are given multiple opportunities to show what they have learned. Emphasis is …

In Vitro Simulation Of Microgravity Induced Muscle Loss Successfully Increases Expression Of Key In Vivo Atrophy Markers, Charles P. Harding

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Muscle loss from lack of activity is a serious issue for immobilized patients on Earth and in human spaceflight, where the low gravity environment prevents normal muscle activity. Simulating muscle loss in cultured cells is an important step in understanding how this condition occurs. This work evaluates different means of simulating muscle loss and selects the one that most closely mimics the cellular responses seen in animals and humans.

To simulate the microgravity environment of spaceflight, mouse skeletal muscle cells were grown in a rotary cell culture system (RCCS). Growing the cells within a natural gelled substrate was compared against …

Landscape Of Stress: Does Drought Prevail Over Anthropogenic Activity In Influencing Cortisol Levels And Fitness In The Pacific Fisher?, Jennifer R. Kordosky

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Fishers (Pekania pennanti) are a species of concern in the Sierra Nevada Mountains of California. Cortisol is a glucocorticoid hormone released to mobilize energy in response to stress and has been used as an indication of an individual’s physiological response to its environment. By collecting samples of fisher hair and measuring an individual’s cortisol, we examined the physiological stress response of the animals to human disturbances (housing density, road density, habitat type, and silvicultural treatements) and drought (tree mortality) in their home ranges. Using AICc model selection, we found that levels of tree mortality within a fisher’s home …

Influence Of Change In Ph On Whey Expulsion From Cheddar Cheese Curds Made From Recombined Concentrated Milk, Kanak Bulbul

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Western Dairy Center at Utah State University funded this project to investigate cheese research using concentrated milks. Concentrated milk was provided by the South Dakota State University and starter culture for this study was prepared and donated by Vivolac Cultures Corporation, Greenfield, Indiana.

The project initiated as a continuation of a previous study on effects of protein concentration, coagulum cut size and set temperature on curd moisture loss kinetics while stirring during cheesemaking. It was aimed at determining the extent to which pH drop prior to draining and final cheese moisture when using microfiltered concentrated milk.

We performed twelve …

Latino Stepcouples’ Experiences Two Years After Stepfamily Education And A Narrative Study Regarding Changes In A Latino Stepfamily Two Years After Stepfamily Education, Sheryl Ann Goodey

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

There are two studies in this dissertation. Both are about couples in a stepfamily who attended stepfamily education called, Smart Steps: Embrace the Journey. The first study explored how 13 Latino stepcouples felt the concepts they learned in stepfamily education influenced their couple relationship, parenting, and their family. Participants ranged in age from 25 to 43. They were interviewed two years after participating in the course. They talked about positive changes that happened in their couple relationship, parenting relationship, and their family as a result of participating in stepfamily education. It was also found that the course helped them …

The Spatial Ecology Of Predator-Prey Interactions: A Case Study Of Yellowstone Elk, Wolves, And Cougars, Michel T. Kohl

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The loss of large apex predators, and their subsequent reintroduction, has been identified as a substantial driver on the structure and function of ecological communities through behavioral mediated trophic cascades (BMTCs). The reintroduction of wolves (Canis lupus) to Yellowstone National Park (YNP) has served as foundational case study of BMTCs. In our system, it has been suggested that wolves have established a ‘landscape of fear’ in which the primary prey, elk (Cervus elaphus), now avoid risky places, which ultimately led to the recovery of the vegetation community. Although this case is frequently cited as a well-understood …

A Case Study Of The Driven 2 Teach Program: Site-Based Experiential Professional Development For History Teachers, Hadyn Bowen Call

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Driven 2 Teach is a privately funded program for history teachers in the state of Utah. The program emphasizes the importance of teacher travel to educate history teachers in the places where history happened. This study investigated the program’s influence on participant gains in learning about history and how to best teach about the past, social studies professional development, teacher beliefs, and changes in instructional practices. This study utilized a case study methodology, autoethnography, and six interconnected frameworks: Professional development, experiential education, site-based learning, pedagogical content knowledge, teacher beliefs, and professional learning communities. This study helps demonstrate the effectiveness of …

Security Of Vehicular Platooning, Soodeh Dadras

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Platooning concept involves a group of vehicles acting as a single unit through coordination of movements. While Platooning as an evolving trend in mobility and transportation diminishes the individual and manual driving concerns, it creates new risks. New technologies and passenger’s safety and security further complicate matters and make platooning attractive target for the malicious minds. To improve the security of the vehicular platooning, threats and their potential impacts on vehicular platooning should be identified to protect the system against security risks. Furthermore, algorithms should be proposed to detect intrusions and mitigate the effects in case of attack. This dissertation …

By Proxy: A Radiocarbon Perspective On Prehistoric Mobility Using Summed Probability Distributions And Paleoenvironmental Reconstructions In Wyoming And Montana, Anastasia M. Lugo Mendez

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Stone circles are among the most common and understudied archaeological features in the Rocky Mountains and High Plains. Their widespread availability coupled with increased archaeological research accompanying oil and natural gas exploration in the region has expanded the availability and size of the region’s radiocarbon database. The dates as data approach uses radiocarbon ages as variables from a larger sample. This thesis compiles radiocarbon ages associated with tipi ring sites in Wyoming and Montana and creates a summed probability distribution from these ages to serve as a proxy for prehistoric mobility. The distribution is corrected for taphonomic bias, or data …

Of One Divided Mind: Fundamental Causes Of The Nineteenth-Century Brethren Schism, 1850-1880, Daniel S. Weller

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Historical research involving the schism within the German Baptist Brethren Church in the 1880s has only been found within broad, general histories of the church. The explanations given by historians relating to the cause of the split have previously centered on individuals and the church publications between 1850 and 1883, and on contemporaries who argued among themselves about whether to adopt practices common among surrounding American religions and society. No known project has focused directly on the content within the publications as it relates to the way these brethren used the Bible and other religious and spiritual rhetoric to substantiate …

The Total Western Diet And Vancomycin Treatment Increase Inflammation-Mediated Colorectal Cancer, Niklas David Joakim Aardema

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Prior work by our research group showed that the total Western diet (TWD), a rodent diet which models the typical American diet, promoted the development of colon tumors when fed to mice. Other researchers previously showed that vancomycin, an antibiotic that changes the gut microbiome composition, causes differential changes in the severity of colon inflammation and CRC. Our goal was to determine the combined effects of feeding the TWD and vancomycin treatment on colitis and CRC, and if these factors interact. We hypothesized that vancomycin treatment would mitigate colitis and CRC in mice fed the TWD. To this end, mice …

Ruminal Protection And Intestinal Availability Of Rumen-Protected Methionine And Lysine In Lactating Dairy Cows, Sara Menchu

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Rumen protected Methionine (MET) and Lysine (LYS) are critical for milk protein synthesis in dairy cows. N-acetyl-L-methionine (NALM) is a MET derivative that consists of L-Met protected with an acetyl group that is attached to the α-amino group.N-acetyl-L-lysine (NALL) is a LYS derivative that is similarly protected. The objectives of these studies were to quantify the gastrointestinal availability of NALM and NALL. Three experiments were run as 3 × 3 Latin square using 3 second lactation Holstein cows that have been fitted with cannulas in the rumen and duodenum. The cows …

Analysis Of Small Faults In A Sandstone Reservoir Analog, San Rafael Desert: Implications For Fluid Flow At The Reservoir-Scale, Leslie Noël Clayton

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

We examined small-displacement faults in the Jurassic Entrada Sandstone adjacent to the Iron Wash Fault, central Utah east of the San Rafael Swell, in order to describe the nature and timing of past fluid movement and deformation in the Entrada Sandstone. Using field studies, microscopy, and X-ray diffraction analysis, we identified mineralized fractures and cementation features in association with deformation bands and fractures at the interface of the Earthy and Slick Rock Members of the Entrada Sandstone.

Where the faults cross the Earthy-Slick Rock Member interface, deformation band faults in the Slick Rock Member become opening-mode fractures in the Earthy …

Narrative Identities Of Early-Return Missionaries From The Church Of Jesus Christ Of Latter-Day Saints, Jillian Ferrell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Leaving home to become a missionary is important for many young adults in The Church of Jesus Christ of Latter-Day Saints (CJC). Some missionaries return home from their missions before their anticipated return date and struggle to make sense of who they are while facing judgment from members within the church communities and families. Little is known about the experience of identity development for early return missionaries (ERMs). There have not been many chances for ERMs to share what it means to them to have come home early from their mission. This study investigated the process of how ERMs make …

Understanding Security Threats Of Emerging Computing Architectures And Mitigating Performance Bottlenecks Of On-Chip Interconnects In Manycore Ntc System, Chidhambaranathan Rajamanikkam

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Emerging computing architectures such as, neuromorphic computing and third party intellectual property (3PIP) cores, have attracted significant attention in the recent past. Neuromorphic Computing introduces an unorthodox non-von neumann architecture that mimics the abstract behavior of neuron activity of the human brain. They can execute more complex applications, such as image processing, object recognition, more efficiently in terms of performance and energy than the traditional microprocessors. However, focus on the hardware security aspects of the neuromorphic computing at its nascent stage. 3PIP core, on the other hand, have covertly inserted malicious functional behavior that can inflict range of harms at …

Revamping Timing Error Resilience To Tackle Choke Points At Ntc, Aatreyi Bal

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The growing market of portable devices and smart wearables has contributed to innovation and development of systems with longer battery-life. While Near Threshold Computing (NTC) systems address the need for longer battery-life, they have certain limitations. NTC systems are prone to be significantly affected by variations in the fabrication process, commonly called process variation (PV). This dissertation explores an intriguing effect of PV, called choke points. Choke points are especially important due to their multifarious influence on the functional correctness of an NTC system. This work shows why novel research is required in this direction and proposes two techniques to …

Estimating Suspended Solids And Phosphorus Loading In Urban Stormwater Systems Using High-Frequency, Continuous Data, Anthony A. Melcher

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The introduction of pavement, buildings, and other impervious surfaces to urban landscapes greatly influences the quantity and quality of urban stormwater runoff. In this study, we designed and implemented modern stormwater monitoring technologies to establish a “smart” stormwater sensor network within the Northwest Field Canal (NWFC), an urban water conveyance located in Logan, Utah, USA. This network was designed to collect flow and water quality data at high frequencies and simultaneously at multiple locations. The observatory’s innovative method of inter-site communication and changing sampling frequencies during storm events was able to capture short duration events at the upstream and downstream …

Youth Prevention Programs: A Framework For Conducting Mediation Meta-Analyses, Morgan A. Kawamura

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Often for prevention program designs, researchers are interested in understanding the processes through which a program impacts a targeted outcome. Mediation analysis assists in identifying not only how a program influences an outcome, but also which intermediate variables (i.e., mediators) cause the effects between a program and an outcome to occur. Mediation analysis explains why a program works, which is useful for program developers in creating effective prevention and intervention-based programs.

To make use of mediation analysis findings for preventive intervention programs, researchers need a comprehensive understanding of the mediators between various programs and outcomes. However, a comprehensive examination into …

Effect Of Physical Stimuli On Angiogenic Factor Expression In Retinal Pigment Epithelial Cells, Farhad Farjood

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Age-related macular degeneration (AMD) is a major cause of blindness in adults. Abnormal growth of blood vessels in the eye during the course of AMD causes damage to the retina, resulting in irreversible blindness. The goal of this research was to determine whether physical pressure on retinal cells can contribute to the increased blood vessel formation. To replicate the tears in the cell layers, a micropatterning method was used as a means of detaching cells from each other. Two new devices were also developed to mimic slow and fast increases in mechanical pressure on cell layers of the eye. After …

The Effect Of "Drought Tolerant" Labeling On Consumers' Preferences And Willingness To Pay For Ornamental Plants, Susanne Tábara Cenador

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Utah’s water resources are endangered by low rainfall rates, high per capita water consumption and a strong projected increase of residents. The irrigation of ornamental plant landscaping is estimated to account for 60% of residential water use, and is, therefore, a target of education programs in the effort to promote water conservancy. The water-wise “Yellow Tag” program developed by the Utah Division of Water Resources seeks to provide retail nurseries with free tags for labeling plants which are considered low water use with the objective of promoting water conservation. The objective of this study is to determine consumer preferences for …

Optimal Foraging And Population Dynamics: An Archaeological Investigation At The Birch Creek Rockshelters, Idaho, Samuel H. M. Yeates

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This thesis aims to integrate the study of population change with the expectations of foraging models, and to test whether expectations resulting from integrating these two bodies of theory have greater predictive power than foraging models alone. To compare these models, I monitored prey age, butchery practice, and prey desirability in five prehistoric occupations of the Birch Creek rockshelters of Idaho. I modeled hunting pressure with a human population density estimate based on radiocarbon dates from Idaho archaeological sites, and modeled prey abundance with a model of historic effective moisture. Both models predicted younger prey, lower average prey desirability, and …

Advancing Streamflow Forecasts Through The Application Of A Physically Based Energy Balance Snowmelt Model With Data Assimilation And Cyberinfrastructure Resources, Tseganeh Zekiewos Gichamo

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The Colorado Basin River Forecast Center (CBRFC) provides forecasts of streamflow for purposes such as flood warning and water supply. Much of the water in these basins comes from spring snowmelt, and the forecasters at CBRFC currently employ a suite of models that include a temperature-index snowmelt model. While the temperature-index snowmelt model works well for weather and land cover conditions that do not deviate from those historically observed, the changing climate and alterations in land use necessitate the use of models that do not depend on calibrations based on past data. This dissertation reports work done to overcome these …

The Impact Of Wood Biochar On The Plant Uptake Of Pharmaceuticals And Personal Care Products From Reclaimed Wastewater, Jeffrey Flashinski

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Reclaimed water (treated water discharged from wastewater treatment plants (WWTPs)) is increasingly used in drier regions for irrigation purposes. This effectively increases the water supply and reduces the amount of WWTP discharge into surface waters but it creates the potential for contaminants in the reclaimed water, such as pharmaceuticals and personal care products (PPCPs), to accumulate in exposed crops. The US Environmental Protection Agency (US EPA) considers PPCPs contaminants of emerging concern due to their near universal presence in the environment and their potential for endocrine disruption. Biochar is gaining attention as a soil amendment and could potentially be used …

Elevating Outdoor Recreation Together: Opportunities For Collaboration Between State Offices Of Outdoor Recreation And Federal Land Management Agencies, Brooke A. Sausser

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Outdoor recreation is a robust pillar of local, state, and national economies as well as a critical component of residents’ quality of life. Recognition of the economic power of the outdoor industry, fused with the growing desire for greater outdoor recreation opportunities, has inspired more than 11 states to establish state offices of outdoor recreation. The organizational structure and mission of each office is tailored to each state, varying from temporary task forces, councils, and commissions to more permanent offices or advisory positions. These offices, though embedded within various sectors of state government, often coordinate across or blend the functions …

Mountain-Block Recharge To The Cache Valley Principal Aquifer And Geochemical Controls On Groundwater Movement In Alpine Karst, Skyler J. Sorsby

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Groundwater is documented to flow through solution-widened fractures and bedding planes in limestone and dolostone units in low-relief topography. This enhancement, or karstification, is much harder to study in alpine environments like the Bear River Range of northern Utah. This is problematic, due to the fact that the Bear River Range karst aquifer system supplies the City of Logan with a large quantity of water at Dewitt Spring. Furthermore, the karst aquifer sustains the Logan River for much of the year, and may allow groundwater to flow directly in the subsurface to the Cache Valley principal aquifer system.

Flow measurements …

Ediacaran Depositional Age And Subsequent Fluid-Rock Interactions In The Mutual And Browns Hole Formations Of Northern Utah, Ashley W. Provow

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Constraining the depositional age of Neoproterozoic stratigraphy in western North America has implications for correlating global glaciation and tectonic events. The depositional ages of the Neoproterozoic Mutual and Browns Hole formations of northern Utah are controlled by two conflicting datapoints. However, new U-Pb geochronological data from 95 detrital apatite grains refines the maximum depositional age of the volcanic member of the Browns Hole Formation to 613 ± 12 Ma (2σ). This places new restrictions on the time available for the deposition of underlying units. Due to debate regarding the age models for underlying stratigraphy, two scenarios for sediment accumulation rates …

Structural Control Of Thermal Fluid Circulation And Geochemistry In A Flat-Slab Subduction Zone, Peru, Brandt E. Scott

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Hot spring geochemistry from the Peruvian Andes provide insight on how faults, or fractures in the Earth's crust, are capable of influencing fluid circulation. Faults can either promote or inhibit fluid flow and the goal of this study is test the role of a major fault, such as the Cordillera Blanca detachment, as a channel for transporting deep fluids to the surface. Hot springs are abundant in the Cordillera Blanca and Huayhuash ranges in Peru, and several springs issue along the Cordillera Blanca detachment, making this region an ideal setting for our study. To test the role of the Cordillera …