Digital Commons Network^™

Application Of A Scale-Resolving Turbulence Model To Supersonic Retropropulsion Flows In Earth And Martian Atmospheres, Rebecca Thompson

Theses

The Blended Partially-Averaged Navier-Stokes (BPANS) turbulence model was used to simulate complex turbulent compressible flows seen in supersonic retropropulsion (SRP). The model was incorporated in the OpenFOAM solver sonicFoam to investigate SRP flows in Earth and Martian atmospheres. The new sonicFoam with BPANS was first tested for subsonic flows using the shear flow benchmark case of flow around a cylinder. Results show good agreement of velocity profiles with experimental values. SonicFoam was then validated for compressible flows using an experimental SRP configuration. Pressure coefficient distribution along the forebody and aft body of the geometry show good agreement with experimental results. …

A Complex Systems Integration Analysis Approach, Tamia Neal

Theses

It has been said that if the building blocks of a system were designed and implemented correctly, then their subsequent integration would be straightforward. The complex systems integration analysis approach presented in this thesis provides the mechanisms to construct those blocks. A spectral clustering algorithm is used to cluster elements into modules, and the normalized integrative complexity metric is used to evaluate the portion of structural complexity that can be attributed to integrating a system from its modules. Together, the algorithm and metric identify which aggregates of system elements reduce the complexity of the integration effort. The proposed integration analysis …

Modeling And Characterization Of Pond And Fresh Ash Leaching In Citric Acid, Christina Fleming

Theses

Resourcing rare earth elements (REEs) from coal ash offers the opportunity to recycle industrial waste and reduce national dependence on foreign suppliers. In this research, the leaching behaviors of pond and fresh ash were studied to evaluate their suitability for REE recovery. Concentrations of REEs in leachates were measured and compared to kinetic models from literature, and the ash was analyzed using Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) to characterize the observed behaviors. The pond ash leachate exhibited lower REE concentrations with steady release patterns, likely due to the acid resistant, REE-bearing aluminosilicate glass phases. In contrast, the …

Observations Of Internal Boundary Layers And Near-Surface Wind Estimation During The Landfalls Of Hurricanes Ida (2021), Zeta (2020), And Laura (2020), Zebulon W. Leffler

Theses

Accurately estimating near-surface winds during hurricane landfalls is crucial for enhancing situational awareness and facilitating post-storm recovery efforts. Previous studies have used coastal radar Velocity Azimuth Display (VAD) winds to estimate 10-m winds during hurricane landfalls; however, a notable weak bias was observed. This work demonstrates that the significant weak bias results from neglecting the wind structure within a shallow internal boundary layer (IBL). Results from an operational radar VAD analysis during the landfalls of Hurricanes Ida (2021) and Zeta (2020) indicate that leveraging the IBL winds is essential for accurate 10-m wind estimates during hurricane landfalls. Additionally, a theoretical …

Evaluating The Operational Performance Of Diverging Diamond Interchanges Under High Heavy Vehicle Traffic Using Synchro Traffic Simulation Software, Hannah Duke

Theses

Diverging Diamond Interchanges (DDIs) are increasingly used to improve traffic flow and safety, particularly where left-turn volumes are high. However, their operational performance under high heavy vehicle percentages has not yet been evaluated. This thesis investigates the impact of varying HV percentages and traffic volumes at a sample DDI location. Traffic simulation using Synchro software was used to model the DDI under scenarios with varying heavy vehicle percentages and varying volumes. This approach allowed evaluation of traffic growth and increasing heavy vehicle presence on DDI performance, capturing realistic operational conditions for freight-heavy corridors. Key performance measures included average control delay, …

Characterization Of Krypton Ion Sputtering Of Spacecraft Materials Using Electric Propulsion, Ethan Cummins

Theses

In the field of electric propulsion (EP), xenon is the most commonly used gas for ionization. However, krypton has been identified as a potential substitute due to its high specific impulse and low cost compared to xenon. Therefore, there is a desire to understand the effects of using krypton. In EP, sputtering of spacecraft materials downstream of the ion engines have proven to be an issue during long duration missions. This research observes how krypton ions sputter a variety of spacecraft materials (anodized aluminum, glass, BN ceramic, and Kapton). The experiments in this study subject materials to different sputtering variables …

Average Heat Flux Measurements In A 25 Mm Rotating Detonation Rocket Engine, Yash Patel

Theses

The average heat flux of a 25 mm rotating detonation rocket engines (RDREs) in an annular center body (CB) and a cylindrical center bodiless (CBL) configuration is measured using a water-based calorimeter. The heat flux sensitivity for both geometric configurations are explored as a function of mass flux (ψ) for a constant equivalence ratio = 1.25 using gaseous methane and oxygen. The average heat flux of the CBL geometry is on average 47% higher at each axial location than the CB geometry for a given ψ. The peak heat flux measured for the CBL chamber is 25.58 ± 0.58 MW/m² …

Spatially-Distributed Imu Array Navigation : Virtual Imu And Federated Approaches With Applications To Uncrewed Aerial Systems, Jackson Neese

Theses

This thesis investigated lever arm effects on distributed inertial measurement unit (IMU) array navigation and evaluated the performance of multiple fusion architectures with applications to uncrewed aerial systems (UAS). The Kalman Filters comprise of three filters: a naive baseline, a filter tracking lever arm as a filter state, and a filter constraining lever arm state estimates around known values. These filters feed into a virtual IMU fusing raw measurements and a federated filter combining output states. Each are evaluated with equal, static, and dynamic weighting based on lever arm and sensor noise. Experiments on indoor and outdoor UAS datasets reveal …

Real Time Temperature Measurement Of Weld Nugget During Friction Stir Welding Operation Using Ultrasonic Thermometry, Daniel Tyler Aiken

Theses

Friction Stir Welding (FSW) is a solid-state joining process widely used for aluminum alloys in aerospace and structural applications due to its ability to produce high-quality joints without melting. The thermal history of the weld tool and surrounding material plays a critical role in governing material flow, microstructural evolution, and resulting mechanical properties. However, accurate measurement of temperature at the tool–workpiece interface remains challenging due to the transient nature of the process, geometric constraints, and ability to obtain subsurface temperature. This thesis investigates the use of ultrasonic thermometry as a non-destructive, high-temporal-resolution method for measuring time dependent, site-specific temperatures from …

Modelling Novel Planar Nozzle Geometries For A Z-Pinch Fusion Propulsion System, Stephanie Manasterski

Theses

Interplanetary travel using chemical or electrical propulsion faces two major obstacles: the long mission timelines and the health risks to human crews from prolonged radiation exposure. Fusion propulsion offers a potential solution through high specific impulse and moderate thrust values. Z-pinch fusion, a pulsed magneto-inertial fusion approach, is promising for propulsion as the plasma is confined through current-driven compression, eliminating the need for external confinement coils to achieve ignition conditions, and the confinement configuration is simple. A 3-dimensional model of a novel linear magnetic nozzle geometry was developed with the propellant, dissociated ammonia, oriented sideways in the nozzle, assuming prior …

Mapping Cave Vulnerability And Priority Areas For Biospeleological Conservation, C. Lael Anderson

Theses

Alabama contains some of the highest levels of subterranean biodiversity in North America, yet no statewide assessment of cave vulnerability has previously been conducted. A spatially explicit vulnerability assessment was developed for Alabama caves using species occurrence records, landscape characteristics, anthropogenic threat data, and groundwater vulnerability metrics. Distribution maps were generated for cave- obligate and bat species, and vulnerability was assessed using human population, land- use, groundwater quality, groundwater quantity, and modified DRASTIK models. Results identified numerous single-site endemic species, regional biodiversity hotspots, and cave systems facing elevated anthropogenic threats. Conservation priority rankings highlighted species and caves of greatest management …

Influences Of Charge Structure And Storm Microphysics On The Relationship Between Optical And Vhf Lightning Observations, Kaitlyn Wheeler

Theses

Lightning observations provide valuable insight into convective intensity, storm structure, and microphysical processes. Much of the current understanding of lightning-convection relationships is derived from ground-based very high frequency (VHF) measurements, while space-based optical observations remain comparatively new. This study investigates how storm charge structure and microphysics influence observed optical lightning emissions using coordinated observations from the 2017 GOES-R Post Launch Test campaign. Optical measurements from the Fly’s Eye Geostationary Lightning Mapper Simulator were combined with Lightning Mapping Array observations for ordinary multicell storms exhibiting a normal charge structure on 18 April 2017 and a supercell exhibiting an anomalous charge structure …

Design And Characterization Of A Low-Power Bulk-Driven Two-Stage Ota In 65nm, 90nm, And 130nm Cmos Technologies For 0.4v-0.6v Biomedical Applications, Raihan Khan Akash

Theses

Biomedical instrumentation requires low-power amplifiers to maximize battery life. Due to threshold voltage limitations, standard gate-driven operational transconductance amplifiers (OTAs) require higher supply voltages. To overcome this, a differential bulk-driven two-stage OTA is introduced for low-power applications. The proposed topology is implemented in 65nm, 90nm, and 130nm complementary metal-oxide-semiconductor (CMOS), with supply voltages ranging from 0.4V to 0.6V. Key metrics such as DC gain, gain-bandwidth product (GBWP), phase margin, common-mode rejection ratio (CMRR), slew rate, power, and noise are measured. The analysis confirms the robustness of the low-power solution provided by the proposed topology.

System-Level Analysis And Experimental Testing Of A Rotating Detonation Rocket Engine With Water Electrolysis Propellants, Justin M. Byers

Theses

This work explores the potential benefits and practical feasibility of a rotating detonation rocket engine (RDRE) spacecraft thruster using water electrolysis for propellant generation. Such a thruster can enable the use of liquid water as an easily storable and chemically inert propellant, as well as the volume and efficiency benefits associated with detonation combustion. A thermodynamic model is first developed to demonstrate the compounding advantages of both water electrolysis propellant generation and detonation combustion when compared to conventional isobaric combustion cycles. Comparisons are also drawn to alternative water-powered propulsion methods and the advantages of chemical propulsion are observed. The representative …

Front Matter

Comparative Civilizations Review

No abstract provided.

The State Of The State: Teacher Edition, Rena Lesué

The Utah English Journal

Mr. Cox clears his throat.

Do we have someone who can take the minutes?

Mrs. Weber? Please?

She tap-taps some papers into order

and pauses to peer down at

a dirty sketch on the surface

of the student desk she occupies.

One hand snakes into her canvas tote

and retrieves a hanky.

She spits into it and smudges

the drawing

into a grotesque

fingerprint.

Book Review: All The Noise At Once, Shalece Garff

The Utah English Journal

All the Noise at Once depicts the life of two incredibly close brothers. The eldest is the star quarterback and is being headhunted by universities across the nation (Brandon), while the other is living with autism and difficulties that come with it (Aiden). Unfortunately, many of the activities that he and his brother are involved in (school and football) are almost always crowded and filled with commotion, which sometimes leads Aiden to experience meltdowns when he is overstimulated with touch and noise. Being seen as different puts him on the outs with the other football players, who regard him as …

The Future Of The English Class Essay: Reimagining Multimodal Composition In The Chatgpt Era, Taylor Rose-Dougherty, Christy Goldsmith

The Utah English Journal

As English teacher educators, we are on the frontlines of navigating the technological elephant in the 2025 writing classroom: Generative Artificial Intelligence (GenAI) technologies like ChatGPT, Claude, and Gemini that can produce pages of text in mere seconds. English teachers’ philosophies on GenAI are as diverse as their preferred novels or their favorite poets. But, as the two dozen publications in major English education journals1 in the past two years suggest, what is at stake is not the end of high school English (Herman, 2022), but the opportunity to give it a makeover (Herman, 2023) by reimagining what writing experiences …

Building Classroom Community With Picturebooks, Deborah Dean

The Utah English Journal

I started my first teaching job in January, after my 7th- and 8th-grade students had had a series of substitute teachers for the entire first semester of the school year. It was rough. An administrative problem that took months to resolve left these students feeling as if no one cared about them. And the series of subs, as well-meaning as they might have been, had not had long-term connections to ensure that these students learned or even paid attention. I tried a lot of ways to get and keep students engaged in those first weeks. A lot. But the first …

Incorporating Texts With People With Disabilities Amidst Scripted Curricula, Kayleigh Kearsley

The Utah English Journal

As I prepare for student teaching this spring, the topic on my and my peers’ minds is scripted curriculum. For emerging teachers, it can be intimidating to determine how to balance the best teaching practices developed in coursework with scripted curriculum, while simultaneously fostering an authentic learning community within my classroom walls. With the rise of scripted curriculum across the state and nation (Kang, 2016), this is becoming an increasingly complex situation to navigate. These curricular resources affect teacher choice, requiring educators to become that much more intentional with the choices they make. An important way to ensure we are …

Teaching Students To Write For The Future By Writing For The Present, Amber Jensen, Meridith Reed

The Utah English Journal

“When you get to eighth grade, you’ll need to know how to write a topic sentence.”

“The five-paragraph essay will prepare you to write in high school.”

“College professors expect you to accurately cite your sources in MLA format.”

“When you graduate from college, you need to be able to write a professional email.”

Perhaps you heard messages like these from your writing teachers as you moved through middle school, high school, college, and into your careers. We certainly did. And perhaps, like we have, you have been a writing teacher in a middle school, high school, or college classroom …

Challenging The Stereotypical Latina In Elizabeth Acevedo's Clap When You Land And The Poet X, Victoria Olsen Yates

The Utah English Journal

Book banning has become a trigger phrase in the United States, and schools have become book-banning hubs. In the 2023–2024 school year, PEN America recorded 10,046 book bans. Among the most commonly banned books, 44% included people of color (BIPOC) and 39% included LGBTQ+ individuals (Meehan, Baêta, Markham, & Magnusson, 2024). Banning books harms marginalized youth because they will not see themselves in literature, causing them to have a distorted view of the world. Rudine Sims Bishop (1990) explains this further in her idea that books can serve as mirrors, windows, and sliding glass doors. Bishop illustrates how books can …

After All, Megan Russell

The Utah English Journal

After all the voices of the day have quieted down,

I think.

After all the pencils have been lost, some sharpened

to nubs, others scattered through the hall,

I wonder.

After all the paper has been crumpled and used up,

I ponder.

Hard-Wired For Success? Unravelling Genomic Signatures In Pollinators, Saam Hasan

School of Biological and Marine Sciences Theses

Global decline among bumblebees shows strong evidence of phylogenetic structure, with the subgenus Pyrobombus over-represented among stable/range-expanding species. Based on this striking pattern, a hypothesis was drawn up suggesting that Pyrobombus species have acquired advantageous traits that enhance their survivability and dispersal compared to other subgenera. This hypothesis explores the possibility that these advantageous traits were acquired via the evolutionary process and are detectable as genomic signatures unique to the subgenus when compared with other subgenera.Twenty-four bumblebee species, representing all 15 subgenera and including 6 Pyrobombus species, were compared. The first study investigated genomic inversions and duplications. Pyrobombus was characterized …

A Cross-Cultural Study Of Parenting Styles And Involvement In Bullying Of Children With And Without Sen, Tansu Ince Cakan

School of Law, Humanities and Social Sciences Theses

This study explores the relationship between parenting styles and children's involvement in bullying, focusing on children with and without Special Educational Needs (SEN) in inclusive education settings in England and Türkiye. While bullying has been widely studied, most research has primarily examined typically developing children, leaving a gap in understanding the experiences of children with SEN. This study addresses this gap by comparing the impact of parenting styles on bullying experiences across both groups and cultural contexts.A mixed-methods approach was employed, combining quantitative and qualitative data collection. The quantitative phase included a questionnaire completed by 217 parents in Türkiye and …

‘The Limits Of The Landscape: A Critical Examination Of Outdoor Learning, Self-Regulation, And Semh Within Neoliberal Schooling’, Nicola Clayton

School of Law, Humanities and Social Sciences Theses

This doctoral thesis critically examines a specialised outdoor learning intervention for primary pupils with significant Social, Emotional, and Mental Health (SEMH) needs who are at risk of exclusion. It assesses the intervention’s implementation and its efficacy in supporting these pupils' capacity for self-regulation and stress management.The study is situated amidst escalating global child mental health concerns and recent English educational policy shifts that mandate schools to actively foster pupil well-being. Exploring outdoor education as a widely cited approach for promoting positive mental health, this research engages with established social theories, particularly those of Bernstein and Bourdieu, to critique the wider …

Exploring And Increasing Women’S And Girls’ Recreational Ocean Access In A Coastal Community In The Tropical Majority, Florence Barraud

School of Law, Humanities and Social Sciences Theses

Vast gender inequalities restrict women’s and girls’ access to ocean spaces, particularly in the tropical majority. Globally, 68% of women cannot swim, compared to 43% of men. In many coastal communities, women are key stewards of highly biodiverse yet vulnerable marine environments that people rely upon for food security, livelihoods, culture, and coastal protection. Being able to swim is imperative for enabling access to the dominant environment and a core recreational, educational, and economic space. This study aimed to explore and increase women’s and girls’ recreational ocean access in the Maldives, a tropical majority island nation.Utilising a pragmatic feminist approach, …

Safe Family Therapy Activities And The Emotional Well-Being Of Parents Of Autistic Children, Gamze Camci

School of Law, Humanities and Social Sciences Theses

This thesis addresses a critical gap in the existing literature on the emotional well-being of parents of autistic children by applying SAFE family therapy activities grounded in the Narrative Attachment Therapy approach through a three-cycle action research design. Stage 1 involved 3 parents as primary participants, with their children present during selected sessions. Stage 2 included 2 families; the primary focus was on 3 parents across these families. Stage 3 engaged 5 therapists. Data were collected through interviews, diaries, questionnaires and therapy recordings. Data from interviews and journals were analysed thematically, whereas questionnaires were analysed idiographically. The first and second …

Predicting Smes’ Credit Risk Using Artificial Intelligence Applications: Evidence From The Uk Smes, Fatima Badi

Plymouth Business School Theses

Financial distress is a state in which businesses struggle to pay their debts, whichfrequently results in bankruptcy or company failure. Small and medium-sizedenterprises are an essential part of economies, making substantial contributions toproductivity growth, innovation and employment. Evaluating financial health iscrucial to preventing possible hardship, reducing systemic risks and ensuring long-term stability because of its significant contribution to national and internationaleconomies.Bankruptcy prediction models play a critical role as early warning systems that enablefirms, lenders and policymakers to identify financial distress at an early stage and takecorrective action before failure becomes inevitable. These warning indicators mayresult from internal issues, such as …

An Empirical Investigation Of The Influence Of Organisational Culture On Individual Readiness For Change In The Kuwaiti Banking Sector, Fahad Alkahlawi

Plymouth Business School Theses

This study investigates the influence of organisational culture on individual readiness for change (IRFC) within the Kuwaiti banking sector. In a rapidly evolving economic landscape, where technological transformation, regulatory shifts, and heightened competition demand organisational adaptability, employee readiness becomes a critical success factor for implementing change initiatives. Drawing on Cameron and Quinn’s Competing Values Framework (CVF), this research examines the impact of four cultural typologies—Clan, Adhocracy, Market, and Hierarchy—on employees’ psychological and behavioural willingness to embrace organisational change.A quantitative, correlational design was adopted to assess how different organisational culture types affect IRFC. Survey data were collected from a sample of …