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3d Printed Microfluidic Nonlinear Structures For Implementing Lab-On-A-Chip Integrated Logic Control, Marshall J. Rawlins
3d Printed Microfluidic Nonlinear Structures For Implementing Lab-On-A-Chip Integrated Logic Control, Marshall J. Rawlins
Theses and Dissertations
Microfluidic devices are individual chips that manipulate small quantities of fluid to perform, for example, biomedical assays. They provide a compact apparatus for conducting chemical processes while using only micro-liter quantities of potentially expensive chemical reagents. Continued research in microfluidics has brought significant achievements in reducing microfluidic feature sizes, allowing for microfluidic systems to be more densely packed and designed for more complex chemical assays. However, this comes with the need for additional control inputs which require additional external equipment to generate the control inputs. This leads to crowding of external inputs, or an increase in chip volume to accommodate …
Physics-Based And Data-Driven Low-Order Modeling Of Centrifugal Compressors, Chase Oliphant
Physics-Based And Data-Driven Low-Order Modeling Of Centrifugal Compressors, Chase Oliphant
Theses and Dissertations
Centrifugal compressors serve as critical components across many applications, yet their design and performance prediction present significant challenges. While computational fluid dynamics provides high-fidelity predictions of compressor behavior, its prohibitive computational cost renders it impractical for preliminary design phases where rapid exploration of the geometric and operating space is essential. Conversely, existing low-order models have enabled efficient performance estimation but suffer from limited accuracy and poor interpretability, particularly when applied to novel geometries or off-design operating conditions. This dissertation addresses these limitations through three complementary contributions that bridge the gap between high-fidelity CFD and preliminary design tools. The first contribution …
Family Processes As A Protective Factor Between Adverse Childhood Experiences And Adolescent Delinquency, Tessa Johnson
Family Processes As A Protective Factor Between Adverse Childhood Experiences And Adolescent Delinquency, Tessa Johnson
Theses and Dissertations
This study explores whether family processes (i.e., parental attachment and parental discipline/monitoring) serve as protective factors between the relationship of adverse childhood experiences (ACEs) and adolescent delinquency. Prior research has established an association between ACEs and many negative life outcomes, including delinquent behavior, while strong parental attachment and parental discipline/monitoring are linked to lower rates of delinquency. However, the interplay of these three factors has been understudied. Drawing on data from the 2024 Florida Youth Substance Abuse Survey (FYSAS) (N=22,016), this study examines the relationship between ACEs, family processes, and delinquency using negative binomial regression models. Results indicate that parental …
Space-Time Coded Pcm/Fm For Aeronautical Mobile Telemetry, Zachary B. Hilton
Space-Time Coded Pcm/Fm For Aeronautical Mobile Telemetry, Zachary B. Hilton
Theses and Dissertations
This thesis describes the application of a space-time block code for the legacy continuous phase modulation called "PCM/FM" in the IRIG 106 standard to solve the "two-antenna problem". This problem arises when two transmit antennas are used for full spatial coverage at the cost of self-interference caused by the different delays between the transmit antennas and the ground-based antenna. The space-time block encoder is described using bit-level operations on the input data stream. The space-time decoder uses coherent combining and maximum likelihood sequence estimation to produce an estimate of the data sequence. Simulation results for zero and various non-zero differential …
Fabrication Of Su-8 Electrically Actuating Membranes, Tyler James Adams
Fabrication Of Su-8 Electrically Actuating Membranes, Tyler James Adams
Theses and Dissertations
This work investigates SU-8 polymer waveguides as a fabrication platform for integrated optical structures. Surface roughening using oxygen plasma etching is used to induce controlled optical scattering, enabling direct observation of guided modes and providing insight into waveguide behavior. Building on this, waveguide geometry is modified through an elevated scattering region (ESR) design, which reduces transition losses and improves scattering efficiency by preserving optical volume within the guiding region. In parallel, suspended SU-8 membranes are fabricated and evaluated for mechanical stability, providing a platform for integrating optical structures beyond conventional substrate-bound configurations. These membranes are further characterized under electrostatic actuation, …
Understanding The Role Of Tiktok As A Source Of Support For Cyberbullying Victims, Saba Iqbal
Understanding The Role Of Tiktok As A Source Of Support For Cyberbullying Victims, Saba Iqbal
Theses and Dissertations
Cyberbullying poses a significant threat to teenagers and young adults, who often seek support and advice online. Little is known about the support and advice shared online for victims of cyberbullying and whether it is helpful. In this study, we used qualitative thematic analysis to examine a sample of 150 TikTok videos that give support or advice for cyberbullying victims. We identify 33 unique pieces of support and advice across 5 categories, with differences in tone and delivery among different types of videos. We then evaluated the quality of 33 unique pieces of cyberbullying advice in a user study with …
Democratizing National Water Model Streamflow Forecasts Through Cross-Platform Mobile Application Development, Jerson J. Garcia
Democratizing National Water Model Streamflow Forecasts Through Cross-Platform Mobile Application Development, Jerson J. Garcia
Theses and Dissertations
The National Water Model (NWM) provides operational streamflow forecasts for 2.7 million stream reaches across the continental United States, yet technical barriers prevent widespread public access to this hydrological infrastructure. This paper presents RIVR (River Information Visualization and Risk), a cross-platform mobile application that transforms National Water Model forecasts into an accessible interface for non-technical users. Built with Flutter, the application deploys to iOS and Android from a single codebase and integrates NOAA forecast APIs, CIROH return-period thresholds, and interactive vector-tile mapping. Performance evaluation across six metrics: application size, startup time, memory consumption, rendering frame rates, API response times, and …
Hybrid Bermudagrass Dormancy Management In A Cool-Season Climate, Clarissa H. Peterson
Hybrid Bermudagrass Dormancy Management In A Cool-Season Climate, Clarissa H. Peterson
Theses and Dissertations
Hybrid bermudagrass (Cynodon dactylon [L.] Pers. × C. transvaalensis Burtt Davy) (HBG) is a water efficient warm-season turfgrass increasingly adopted in cool-season and semi-arid regions due to climate change and the demand for reduced irrigation inputs. However, prolonged winter dormancy limits its visual quality (verdure) and seasonal performance. This thesis evaluated multiple management strategies to modify dormancy dynamics and improve off-season turf quality in a cool-season environment. Field experiments assessed the effects of growth covers, fertilizers, colorants, surfactants, organic acids, and overseeding with cool-season species on HBG dormancy over two seasons. Dormancy responses were quantified using normalized difference vegetation index …
Hypertext Transfer Protocol Fingerprinting: Techniques For Attacker-In-The-Middle Proxy Detection, Evasion, And Counter-Evasion, Jensen George Wood
Hypertext Transfer Protocol Fingerprinting: Techniques For Attacker-In-The-Middle Proxy Detection, Evasion, And Counter-Evasion, Jensen George Wood
Theses and Dissertations
Attacker-in-the-middle (AitM) phishing toolkits have emerged as a critical threat to enterprise and individual security by enabling adversaries to bypass multi-factor authentication (MFA) and compromise cloud-based accounts at scale. Traditional detection techniques--such as IP blocklists or content-based detection methods--are often ineffective against these increasingly sophisticated attacks. We propose a novel method that detects malicious proxies by identifying artifacts they introduce into HTTP request headers. To evaluate our approach, we systematically analyze traffic passed through several open-source AitM toolkits and proxies, identifying distinct modifications to header structures and content, then formalize these features as YARA rules for automated use. To validate …
Path Planning And Control For Vertical Takeoff And Landing Aircraft, Dean Benjamin Anderson
Path Planning And Control For Vertical Takeoff And Landing Aircraft, Dean Benjamin Anderson
Theses and Dissertations
One of the challenging problems of unmanned aerial vehicles (uav) is controlling vertical takeoff and landing (vtol) aircraft. Vtol aircraft can take off and land without landing strips while retain the efficiency of fixed-wing airplanes for long range flight. Unfortunately, the transition from takeoff and forward flight, and from forward flight to landing, is an extremely difficult control problem. Most current controllers for transition switch between flight regimes based solely on airspeed. The trajectory for such switching transitions is a straight vertical ascension followed by a straight forward startup flight; it does not allow for the development of more complex …
Real-Time Data Collection System For Low-Cost Diesel Emissions Monitoring, Zachary Driskill
Real-Time Data Collection System For Low-Cost Diesel Emissions Monitoring, Zachary Driskill
Theses and Dissertations
Diesel trucks are a major source of pollutants, including particulate matter (PM) and NO$_x$. Roadside emissions monitoring can identify high-emitting diesel vehicles, but conventional sensing systems rely on expensive, complex sensing instruments that limit widespread deployment. Low-cost sensors offer increased scalability due to their small size, low cost, and low power consumption, but they have lower accuracy and slower response time. This thesis presents the design and evaluation of a low-cost roadside emissions monitoring system, establishing the foundation for a scalable and widely deployable alternative. We apply machine learning calibration to roadside emission monitoring to improve the usability of low-cost …
Implementation And Evaluation Of Alternative Methods For Simulation Of Sidescan Sonar, Blake Paul Romrell
Implementation And Evaluation Of Alternative Methods For Simulation Of Sidescan Sonar, Blake Paul Romrell
Theses and Dissertations
The original sonar implementation for the HoloOcean simulator was built upon a cached octree representation of the world. On first runs, building the cache was prohibitively slow, and the cache had a major memory footprint. This work presents alternative implementations for the sidescan sonar using direct raytracing on the CPU and rendering on the GPU. To evaluate and compare the implementations, timing tests on comparable parameters, as well as sweeps on resolution and range parameters, were performed. The render-based GPU implementation outperformed the others in the timing tests.
Leveraging River Forecast Center Knowledge To Improve Large-Scale Hydrologic Model Performance Through Bias Correction, Ian Mathews
Theses and Dissertations
The National Water Model (NWM) provides continental-scale streamflow predictions but exhibits bias and reduced skill in highly regulated and snow-driven basins. In contrast, River Forecast Center (RFC) models incorporate decades of local calibration and regulatory knowledge but are limited in spatial coverage to specific points of interest. This study evaluates whether hydrologic knowledge embedded in RFC-calibrated simulations can be transferred to improve NWM performance at unmonitored locations using the Streamflow Analysis for Bias Estimation and Reduction (SABER) framework. Using Colorado Basin River Forecast Center (CBRFC) simulations as surrogate reference data, we applied SABER to the NWM 44-year retrospective model simulation …
Advancing Cyclic Ion Mobility Mass Spectrometry For Structural Characterization, Isomer Discrimination And Gas-Phase Ion Chemistry, Sudam Shivaji Mane
Advancing Cyclic Ion Mobility Mass Spectrometry For Structural Characterization, Isomer Discrimination And Gas-Phase Ion Chemistry, Sudam Shivaji Mane
Theses and Dissertations
This dissertation focuses on the development and application of high-resolution ion mobility-mass spectrometry (IMS-MS) methodologies for gas-phase separation and structural characterization of small molecules, with particular emphasis on epimers, positional isomers, and protomers. In addition to structural separations, this work investigates fundamental aspects of gas-phase ion chemistry using IMS-MS in combination with collision-induced ion activation and dissociation techniques. Advanced separations were performed using cyclic traveling-wave ion mobility spectrometry (cyclic TWIMS), implemented in a commercial cyclic ion mobility-mass spectrometry (cIMS) platform, to systematically evaluate both the capabilities and limitations of high-resolution IMS in resolving subtle structural differences. Initial studies demonstrated that, …
Redox Reprogramming In Neurogenesis: Candidate Developmental Switches And Targets Of Oxidative Toxicity In The Redox Proteome, Ryan Jacob Summerhays
Redox Reprogramming In Neurogenesis: Candidate Developmental Switches And Targets Of Oxidative Toxicity In The Redox Proteome, Ryan Jacob Summerhays
Theses and Dissertations
Neurogenic differentiation requires coordinated redox regulation, yet how reversible cysteine oxidation is remodeled at proteome scale during this process remains poorly defined. Here, we asked whether differentiation is associated with selective, site-specific changes in reversible cysteine oxidation and whether oxidative stress reveals developmentally conditioned vulnerabilities within this redox landscape. To address this, we applied a discovery-oriented, proteome-scale redox profiling strategy that quantifies condition-dependent changes in reversible cysteine oxidation using CysPAT labeling, phosphopeptide enrichment, and multiplexed TMT mass spectrometry. Neurogenic differentiation was characterized by reproducible, bidirectional, and highly site-specific remodeling of reversible cysteine oxidation at discrete regulatory nodes, as well as …
Practical, Scalable, And Cost-Effective Nanolc-Ms Workflow For Single-Cell Proteomics, Siqi Huang
Practical, Scalable, And Cost-Effective Nanolc-Ms Workflow For Single-Cell Proteomics, Siqi Huang
Theses and Dissertations
Single-cell proteomics provides a novel research strategy for decoding cellular heterogeneity, revealing the molecular mechanisms of rare cell subpopulations, and studying the dynamic responses of cells to external stimuli. However, compared to transcriptomics, single-cell proteomics faces even more challenging technical challenges: extremely low protein amount in single cells, wide dynamic range, significant adsorptive losses during sample preparation, and the complex matrix and trace sample injection demanding extremely high stability and sensitivity from the separation and detection systems. Mass spectrometry-based bottom-up proteomics has become an important tool for analyzing complex biological systems, and nano-flow liquid chromatography-mass spectrometry (nanoLC-MS) exhibits unique advantages …
Differentials As Models: Constructing A Differentials-Within-Limits Framework For First-Year Calculus And Examining Students' Understanding Of Limits, Differentials, And Derivatives Within It, Alexander A. Swindler
Differentials As Models: Constructing A Differentials-Within-Limits Framework For First-Year Calculus And Examining Students' Understanding Of Limits, Differentials, And Derivatives Within It, Alexander A. Swindler
Theses and Dissertations
Work in first-year calculus has clearly shown the power that treating differentials (such as dx) as tiny quantities affords for first-year calculus learning, yet a traditional limits-based approach leaves no room for them. While some researchers have loosely described informal differentials and limits within the same paradigm, their actual conceptual definitions and relationships have not been explicitly constructed. Continued progress in this area could benefit from theoretical consideration of (a) providing clearer intuitive definitions for differentials inside a limits-based approach to calculus, and (b) defining more exactly the relationships between differentials and limits. In this study, I propose a theoretical …
"Deep In The Trenches": A Multi-Perspective Interpretive Phenomenological Analysis Of Student Mothers Navigating The Hidden Realities Of Postpartum Anxiety, Rhonda Harris
Theses and Dissertations
Despite availability of effective treatments women with postpartum anxiety (PPA) commonly go untreated because of barriers to care. Student mothers are a particularly vulnerable subgroup of women as they tend to be younger, are less likely to be married, and have lower incomes than non-student mothers. As anxiety rates in college women are higher than the general population and higher than college men, student mothers are at high risk of the adverse effects of untreated PPA. There is a paucity of existing literature about student mothers and mental health. The aim of the current study is to understand the help-seeking …
Transcriptomic Analysis Of Xeroderma Pigmentosum Group C Skin Samples, Austen N. Gleave
Transcriptomic Analysis Of Xeroderma Pigmentosum Group C Skin Samples, Austen N. Gleave
Theses and Dissertations
Xeroderma Pigmentosum is a rare genetic disorder caused by defective DNA damage repair enzymes. This condition results in an increased risk of developing skin cancer and other symptoms in those affected. In this thesis, we examined the effects of Xeroderma Pigmentosum on gene expression in patient skin biopsy samples. To accomplish this, we utilized statistical analysis of spatial transcriptomic and single-cell RNA sequencing techniques to discover differences between patient and heterozygous carrier skin samples. We found that the skin samples from Xeroderma Pigmentosum patients showed elevated levels of inflammation, immune activation, and cellular stress, while the carrier skin samples leaned …
The Impact Of Principal Preparation Program Components On Self-Efficacy Development In Aspiring School Leaders, Michelle Price
The Impact Of Principal Preparation Program Components On Self-Efficacy Development In Aspiring School Leaders, Michelle Price
Theses and Dissertations
Leaders with high self-efficacy demonstrate greater persistence when facing adversity, implement organizational change more readily, and establish higher goals for themselves and their organizations. This qualitative study examines which components of principal preparation programs most strongly contribute to self-efficacy development among aspiring school leaders in Utah, specifically in instructional leadership and management for learning. Through semi-structured interviews with 19 recent graduates from three Utah universities, the research explores how program components influence candidates' confidence to lead schools effectively. Grounded in Bandura's self-efficacy theory, the findings reveal that while cohort-based models and faculty characteristics provide foundational support for overall efficacy development, …
No Principal Left Alone: Exploring Elementary Principals' Relationships With Their Full-Time Assistant Principals, Shauna Worthington
No Principal Left Alone: Exploring Elementary Principals' Relationships With Their Full-Time Assistant Principals, Shauna Worthington
Theses and Dissertations
Elementary school principals are often the only administrator in their building; therefore they are left to face the adverse circumstances of their job without the support of an administrative colleague at their school. However, U.S. nationwide data suggests that school districts are more frequently hiring elementary assistant principals. This paper explores perceptions of elementary principals about the nature and dynamic of their relationships with their full-time assistant principals, including accompanying benefits and challenges. This qualitative inquiry utilizes an exploratory, descriptive, phenomenological approach and features the results of in-depth interviews with 20 elementary school principals in two large suburban public school …
Entwurzelt, Melanie Fischer
Entwurzelt, Melanie Fischer
Theses and Dissertations
Entwurzelt (Uprooted) is an installation that explores the emotional landscape of displacement-trauma, grief, and the search for belonging in the aftermath of war and unrest. The vessels in this installation evoke the presence of a forest--each one a symbolic tree, rooted in memory and shaped by personal and collective histories. Being torn from the familiar means leaving behind everything except memories and carrying a void that may never be fully filled. Yet, in unfamiliar places, fragments of comfort can be found--echoes of what once was. For me, the forest is more than a memory--it is a bridge between past and …
Fallow Ground, Eli Kerns
Fallow Ground, Eli Kerns
Theses and Dissertations
Fallow Ground refers to the agricultural practice of intentionally leaving a field unseeded for a year or more in order to restore fertility and interrupt cycles of depletion. Although fallowing is a beneficial and necessary practice, the term has also come to signify waste or a lack of productivity. This double meaning is central to the work, reflecting a central contradiction: that withdrawal can be as vital as effort, and that rest, like labor, can function as a deliberate and sustaining act. The question I explore in this work is how to organize, understand, and live with these contradictions. Through …
Observational Diagnostics And Spectroscopic Detection Of Tropospheric Trace Gases And Oxidation Processes, Callum E. Flowerday
Observational Diagnostics And Spectroscopic Detection Of Tropospheric Trace Gases And Oxidation Processes, Callum E. Flowerday
Theses and Dissertations
The troposphere is governed by photochemical and radical-mediated processes that control atmospheric oxidation capacity, secondary pollutant formation, and the chemical lifetime of gases. Quantitative understanding of these processes requires both robust observational frameworks capable of resolving complex precursor–product relationships and instrumentation with sufficient sensitivity and selectivity to detect reactive and low-concentration species. This dissertation advances atmospheric chemistry through the parallel development of quantitative observational methodologies and refined spectroscopic measurement techniques. The first component of this work evaluates atmospheric oxidation systems using long-term monitoring data and empirical diagnostics. Multi-year analyses of ozone and particulate matter trends were conducted to characterize variability …
The Role Of Emerin In Myogenic Differentiation, Nicholas Marano
The Role Of Emerin In Myogenic Differentiation, Nicholas Marano
Theses and Dissertations
The nucleus harbors genetic material encapsulated by the nuclear envelope which is composed of an inner and outer nuclear membrane. The establishment and organization of chromatin at the INM is essential for cell fate during the differentiation program. Integral INM proteins are responsible for chromatin organization at the nuclear envelope. Emerin is a highly conserved type II integral INM protein with roles in chromatin organization, cell signaling, and nuclear structure. Mutations in the emerin gene cause Emery Dreifuss Muscular Dystrophy 1 (EDMD1). Emerin is ubiquitously expressed, but loss of emerin function affects specifically skeletal muscle and cardiac tissue. The precise …
Does Concurrent Completion Of A Computer Task Interfere With Talking? Comparing Younger And Older Adults, Emma Simpson Hymas
Does Concurrent Completion Of A Computer Task Interfere With Talking? Comparing Younger And Older Adults, Emma Simpson Hymas
Theses and Dissertations
This study investigates the impact of a computer-based divided attention task on spoken language and compares the impact between younger (18–30 years) and older (55–82 years) adults. Sixty adults participated in a speaking task and two computer tasks which varied in difficulty. The Level 1 computer task involved highlighting each instance of the word “the” and the Level 2 computer task involved highlighting each instance of the word “the” while also underlining each instance of the word “a”. Each task was completed alone and then two computer tasks with different levels of difficulty were completed concurrently with a procedural discourse …
Objective Conditioning Via Latent-Factor Modeling, Kalman-Smoothing, And Hidden Markov Clustering: An Application To Empirical Asset Pricing, Melanie R. Neller
Objective Conditioning Via Latent-Factor Modeling, Kalman-Smoothing, And Hidden Markov Clustering: An Application To Empirical Asset Pricing, Melanie R. Neller
Theses and Dissertations
Empirical asset pricing relies heavily on conditioning sets--industry groupings, size buckets, valuation screens, and other researcher-defined partitions--to structure cross-sectional tests and portfolio construction. While intuitive, such partitions risk blending heterogeneous firms, masking latent exposures, and introducing omitted-variable bias. This thesis develops an objective, mathematically grounded conditioning pipeline that replaces subjective groupings with latent-factor extraction, Kalman-based data techniques, and probabilistic clustering via Gaussian hidden Markov models (HMMs). Using CRSP monthly returns, the framework stabilizes noisy return data, extracts systematic structure through principal component analysis (PCA), identifies homogeneous stock cohorts through HMM clustering, and models regime persistence using Markov transition matrices. These …
Electrochemical Sensors And Processes In Molten Salts: Chlorine Production, Electroanalytical Chemistry, And Thin-Layer Electrodes, Tyler Williams
Electrochemical Sensors And Processes In Molten Salts: Chlorine Production, Electroanalytical Chemistry, And Thin-Layer Electrodes, Tyler Williams
Theses and Dissertations
Molten salt electrochemistry has historically played a substantial role in the metallurgical industry, and this trend is only accelerating in areas of green steel, direct ore processing, and rare-earth processing. In addition, the recent surge of interest in molten salt nuclear reactors has provided an additional application for molten salt electrochemical processes, including the reprocessing of used nuclear fuels and the development of electrochemical sensors for nuclear applications. In this work, the development of a chloride volatility separation process for used nuclear fuel is advanced; electroanalytical methods are improved for identifying and quantifying unknown analytes with and without the presence …
Generalizing Networks To Address Data Imbalance For Facial Action Unit Recognition, Andrew W. Sumsion
Generalizing Networks To Address Data Imbalance For Facial Action Unit Recognition, Andrew W. Sumsion
Theses and Dissertations
Facial action unit (AU) recognition is used in a variety of downstream applications, including sign language translation, dementia detection, pain detection, and other high-impact tasks that require understanding facial motion. Although AU recognition is a well-established field, a number of unresolved issues remain. An initial problem is the need to improve overall performance on the benchmark datasets, as measured by the average F1 score. Also, the performance across all individual AUs, not just the average F1 score, needs to be increased. Recently, the field has shifted its attention towards ensuring that AU recognition models generalize beyond the distributions represented in …
Tusqh: Topological Control Of Volume-Fraction Meshes Near Small Features And Dirty Geometry, Brian Reese Shawcroft
Tusqh: Topological Control Of Volume-Fraction Meshes Near Small Features And Dirty Geometry, Brian Reese Shawcroft
Theses and Dissertations
This work develops a framework to create meshes with user-specified homology from potentially dirty geometry by coupling background grids, persistent homology, and a generalization of volume fractions. For a mesh with fixed grid size, the topology of the output mesh changes predictably and monotonically as its volume-fraction threshold decreases. Topological anti-aliasing methods are introduced to resolve pinch points and disconnected regions that are artifacts of user choice of grid size and orientation, making the output meshes suitable for downstream processes including analysis. The methodology is demonstrated on geographical, mechanical, and graphics models in two-dimensions (2D) and three-dimensions (3D) using a …