Digital Commons Network^™

Structural Degradation Causing Silicone Sealant Failure: A Comprehensive Analysis Using Evolved Gas Analysis And Thermal Desorption-Pyrolysis Gas Chromatography, Eugene Agbor Oga

Theses and Dissertations

Silicone sealants are essential components in various applications, but their long-term performance can be compromised by aging and weathering. This study investigated the thermal degradation behavior of poly dimethyl silicone sealants to gain insights into the underlying mechanisms of failure. A combined approach using Evolved Gas Analysis (EGA) and Thermal Desorption-Pyrolysis Gas Chromatography-Mass Spectrometry (TD-Pyr-GC-MS) was employed to analyze the degradation products and identify the factors influencing the degradation process.Aged and weathered sealants exhibited distinct thermal degradation profiles compared to fresh samples. The evolution of siloxane degradation products occurred at lower temperatures in aged sealants, indicating accelerated degradation. TD-Pyr-GC-MS analysis …

Investigation Of The Existence Of Vertically Oriented Ice Crystals In Winter Storms, Kendra R. Sand

Theses and Dissertations

The existence of vertically oriented ice crystals is investigated in winter storms, as observed through remote sensing and analyzed during the NASA Earth Venture Investigation of Microphysics and Precipitation for Atlantic Coast-Threatening Snowstorms (IMPACTS) field campaign field campaign. The primary objective was to determine if a preferred angle of ice crystal orientation could be identified in situ using contemporary airborne sampling instruments. Additionally, the study sought to explore potential correlations between the vertical orientation of ice crystals and electric field anomalies at cloud top, as well as the relationship between crystal orientation and particle concentration. To achieve these objectives, Two-Dimensional …

Hydraulic Fracturing And Reservoir Simulation Modeling Of Enhanced Geothermal System Optimization For Economical Energy Production, Jerjes W Porlles Hurtado

Theses and Dissertations

Enhanced Geothermal Systems (EGS) have the potential for sustainable energy production but require large upfront expenditures and strategic development to be profitable. To reduce costs and increase energy output, this work integrates hydraulic fracturing (HF) modeling with reservoir simulation optimization to improve EGS design and operating efficiency. EGS uses hot, dry rock geothermal resources, mostly crystalline and sedimentary rocks with poor permeability. Shear stimulation is preferred over hydraulic fracturing in EGS reservoirs, but a comprehensive HF strategy is still lacking. This study fills this gap by evaluating hydraulic fracturing and proppant use for optimal EGS development. Hydraulic fracturing in EGS …

Handheld Multimodal Point Spectroscopy, Rgb Imaging, And Fusion Artificial Intelligence To Determine The Species And Freshness Of Fish Fillets, Mitchell Sueker

Theses and Dissertations

When fish species are mislabeled and the fish’s freshness is inaccurately represented, health, environmental, and economic problems can arise for both consumers and the fish industry. Fish are some of the easier foods to mislabel, as the processing of whole fish to fillets makes the visual identification of the species and freshness assessment more challenging. Due to the shortcomings of the current industry standards, confirmed by our interviews with over 20 professionals in all fish supply chain nodes, developing a system that can provide accurate and rapid on-site fraud detection is of necessity. In an attempt to meet these needs, …

Development Of Fluorescent-Based Nanoparticles For Bioimaging, Gene Regulation Expression, And Photo-Induced Synergistic Cancer Therapy, Di Sun

Theses and Dissertations

Fluorescent-based nanoparticles have been applied to a broad range of biological applications, as discussed in this dissertation, including bioimaging, gene regulation expression, and photo-induced synergistic cancer therapy. Prior to applications, this dissertation first focused on the development and characterization of several fluorescent-based nanoparticles using different methods. These include 1) Streamlined synthesis of dual-emissive fluorescent-based silicon quantum dots (SiQDs). The SiQDs were generated as a promising, non-toxic labeling tool for bioimaging of a variety of cell types. both in visible and near-infrared (NIR) ranges. 2) Polymer-based nanoparticles - Polymer dots (Pdots) with a strong NIR fluorescence. The Pdots were functionalized as …

Kinetics And Mechanism Of Multiscale Formation And Inhibition In A Mixture Of Calcium Carbonate And Calcium Sulphate Salts, Glavic Tikeri

Theses and Dissertations

Despite the ongoing research, there remains a significant gap in the understanding of the formation dynamics of mineral scale, particularly calcium carbonate and calcium sulfate. This study primarily aims to elucidate the behaviors of these scales' interactions and deposition. The experimental work was conducted mostly using an in-house-made continuous stirred tank reactor laser setup. By continuously monitoring changes in laser intensity within supersaturated solutions of calcium carbonate and calcium sulfate, their formation kinetics was captured, and variations in induction time under varying physicochemical conditions of temperature and pH was quantified. The laser setup was also used to assess the effectiveness …

Evaluating Uas As A Tool For Improving Elk Population Counts In A Suburban Forested Area Of North Central Colorado, Michael Wussow

Theses and Dissertations

For decades, wildlife researchers have taken advantage of an aerial perspective for performing population counts because of challenges associated with ground observations. Due to advances in aviation technology and regulations, unoccupied aerial systems (UAS) have become increasingly available for wildlife population monitoring in addition to manned aircraft, with success largely dependent on the species, their habitat, and UAS utilized. This study compares a currently accepted method of counting North American elk (ground/spotting scope counts) to a novel method (UAS) to evaluate if a commercial-off-the-shelf quadcopter (COTS) UAS equipped with zoom-capable RGB cameras would be an acceptable tool for counting elk …

The Fcc 5-Year Deorbit Rule’S Impact On The Space Industry Including Non-Traditional Scientific And Environmental Stakeholders, Kristin Shahady

Theses and Dissertations

In pursuit of a safer and more sustainable space environment, the Federal Communications Commission (FCC) introduced the 5-year deorbit rule, a regulatory mandate aimed at mitigating space debris by requiring satellite operators to remove their spacecraft from LEO within 5 years after their mission is complete. While the intent behind this rule is admirable in the desire to remediate and limit the generation of orbital debris, it raises questions whether it was crafted with consideration of all stakeholders, whether it will truly mitigate the creation of orbital debris, and whether it exhibits characteristics of arbitrariness and capriciousness. Agencies’ actions be …

Investigation Of Gas Injection Eor In Conventional And Unconventional Reservoirs Based On Laboratory Experiments And Field Pilot Tests, Jin Zhao

Theses and Dissertations

Currently, fossil fuels (including oil, natural gas, and coal) are still the dominant energy sources in the United States. However, their extraction and utilization generate a significant volume of carbon dioxide (CO2) and associated gases, such as methane (CH4), ethane (C2H6), propane (C3H8), etc. Injecting these gases back into deep oil reservoirs offers a practical means to enhance oil recovery while reducing air pollution. The target formations are usually characterized by good porosity and permeability to ensure sufficient injectivity and storage capacity. However, recent unconventional reservoir development indicated that tight formations could also be potential targets for enhanced oil recovery …

Construction Law, Peter Crofton, David Cook, Derek Andre

Mercer Law Review

Construction law is an ever-evolving field, and 2023 was no different. Over the past year, the state and federal courts in Georgia issued orders and opinions on a variety of topics affecting the construction industry, such as arbitration, construction insurance, and licensing. This article discusses some of the most important of these cases.

Incorporating Families Experiencing Disabilities Into The Rhythm Of Small Groups At Saturn Road Church Of Christ, Robby John

Doctor of Ministry Theses and Dissertations

This project addresses the critical gap in the inclusion of families experiencing disabilities within small groups at Saturn Road Church of Christ. The primary aim is to develop a curriculum that raises awareness among small group leaders about this significant issue. To provide a theological reflection on the necessity of such a venture, I explored the topic through the lens of four theological pillars: the image of God, the incarnation, ecclesiology, and eschatological hope. This exploration revealed several key themes that serve as foundational building blocks for the awareness curriculum. Ultimately, the final artifact is an awareness curriculum designed to …

The Reconciliation Roots Of Fourth Amendment Privacy, Sophia Z. Lee

University of Chicago Law Review

The Roberts Court has made protecting “the privacies of life” a catchphrase of Fourth Amendment law in the digital era. The time is thus ripe for revisiting the doctrinal and political roots of this newly influential quote from the Court’s 1886 decision Boyd v. United States. Existing scholarship views Boyd and its paean to privacy as an opening salvo in the Supreme Court’s turn-of-the-twentieth-century deregulatory jurisprudence (often associated with the Court’s most famous substantive due process decision, Lochner v. New York). Scholars also assume Boyd’s emphasis on privacy was in keeping with the Founders’ view of the Fourth Amendment.

This …

Solving The Housing Puzzle, George J. Vojta

University of Chicago Law Review

This Comment analyzes the entrance of institutional investors into the single- family rental market after the Great Recession of 2008. The collapse of the housing market during the Great Recession fundamentally changed the ownership structure of U.S. single-family homes in two distinct ways. First, the number of families renting single-family homes soared. And second, institutional investors entered the single-family home market, buying many homes and converting them into rental properties. This postrecession reality has introduced a housing puzzle: the pricing trends of single-family rentals in the decade after the Great Recession suggest that institutional investors have captured monopolistic power over …

Disability Discrimination By Clinical Algorithm, Elizabeth Pendo, Jennifer D. Oliva

North Carolina Law Review

No abstract provided.

Virtual Production In Unreal Engine 5: Tools For The Game And Film Industry, Hannah Hogan

Master of Fine Arts in Digital Media Culminating Experience

Virtual Production (VP) blends both the game and film industries with the use of Unreal Engine. This thesis explores how Unreal Engine 5 (UE5) bridges the gap between these fields, providing powerful tools for both film projects and immersive experiences. The research examines UE5's capabilities, including real-time rendering, photorealistic environments, and immersive set design, and demonstrates how game and film production workflows intersect. This study focuses on three case studies highlighting how VP tools can be used in district ways: immersive gameplay, film production, and creating engaging video game trailers. Finally, this research explores the advantages of the diverse ways …

Examination Of The Relationship Between Algal And Mussel Populations In Streams, Haarika Hebbur

Honors Projects

Due to the ecological importance of both mussel and algal populations, understanding their interactions is critical for further studies in the field. This literature review will explore the functions of both organisms within stream ecosystems, followed by an observational study. The study is designed to evaluate the potential interactions between algal biomass and mussel populations using chlorophyll a concentration as a tool for algal abundance measurement.

Teachers’ Life Experience Of Trauma And Its Impact In The Classroom, Casey Voelz

All-Inclusive List of Electronic Theses and Dissertations

The purpose of this qualitative study was to determine if teachers’ lived experiences of trauma impact practices, relationships, and responses to student behaviors in the classroom. The common themes could allow colleges, school districts, and school leaders to reflect, develop, or improve access to therapeutic interventions and teacher self-discovery in the areas of self-awareness, self-regulation, and emotional intelligence. This qualitative study involved obtaining data from the Indiana Department of Education. The Indiana Department of Education provided email addresses for superintendents for public schools in Indiana. Superintendents received an email requesting teacher participation. If approved, teachers received the ACE survey. From …

Basic Safety Message Generation Through A Video-Based Analytics For Potential Safety Application, Abyad Enan

All Theses

With the advancement of modern artificial intelligence techniques, computer vision can play a vital role in enhancing roadway safety by reducing the risk of imminent collisions. To do so, a vision-based safety application is required, where a roadside camera can monitor the roadway traffic and predict potential risks of crashes in real-time. If any risky situation or behavior is observed that may lead to a crash, then a safety application can send warnings to the vehicles at risk. For vision-based safety applications on a roadway section, it is important to accurately monitor each vehicle’s location, speed, acceleration, heading direction, etc. …

Prediction Of Dislocation Density During Casting Of 316 Stainless Steel Based Alloys As A Function Of Chromium And Nickel Composition, Abhishek Chitradurga Ranganath

All Theses

By the 1990s, computational methods were beginning to be used to study dislocation density in mental casting. Prior to that time research was based heavily on laboratory studies. This move was encouraged by the need to overcome limitations that experimental approaches had, including high costs and time-consuming processes, and needs of researchers to understand atomic-scale phenomena. Computational techniques allow complex materials to be simulated in cost effective way and can provide insight into behaviour that could never be determined through experimental methods alone.

This work utilized molecular dynamics (MD) simulations along with machine learning approaches to examine the dislocation density …

Estimating The Impact Of Houthi Military Action On Shipping Traffic Through The Bab El-Mandeb Strait, Grayson Robinson

All Theses

In this paper I estimate the effects of military action by the Houthi rebels in Yemen on international shipping through the Bab el-Mandeb Strait. Given the increased security concerns and dangers faced by ships, there has been a considerable decline in the shipping traffic traversing the strait. Disruptions to the Bab el-Mandeb Strait, which feeds into the Red Sea, have led many ships instead electing to take the longer alternate route around the African continent. Using shipping and attack data in the Bab el-Mandeb Strait from January 2022 to October 2024, I design a quasi-experimental Difference-in-Differences (DID) model to estimate …

Hardware Applications Of High-Speed Fault Detection Algorithms, Daniel Zintsmaster

All Theses

The growing need for a sustainable electric energy infrastructure has driven research into control, protection, and optimization of power systems. A key challenge is that the changing grid must operate at increasingly higher speeds, but many current hardware devices cannot meet these demands. This thesis focuses on power system protection, aiming to design a hardware solution that can detect and isolate faults in microseconds, ensuring faster, more reliable grid operations. The first hardware developed was for a low-voltage direct current (LVdc) microgrid, which faces challenges due to a lack of protection schemes and novel speed requirements. This thesis presents protection …

Comparative Analysis Of Design-Build And Design-Bid-Build Project Delivery Methods Through Cost, Schedule And Quality Performance For Warehousing And Storage Facilities, Vijaya Ravi Prasanth Reddi

All Theses

Storage facilities are essential for e-commerce operations, providing inventory, distribution, and delivery space. As per the Bureau of Labor Statistics, the number of warehousing and storage businesses in the United States increased from 15,152 in 2010 to 21,287 in 2024, showing continuous growth over the decade. Given the recent surge, there is a need to understand the performance of these facilities better. This study aims to contrast the measure of quantitative performance of design-build (DB) versus traditional design-bid-build (DBB) project delivery methods (PDM) based on cost, schedule, and quality metrics for storage facilities. This research conducted a literature review to …

Application Of Lossy And Lossless Compression To Dicom Files, Yizhe Yang

All Theses

The Digital Imaging and Communications in Medicine (DICOM) standard is widely utilized for the management, storage, and transfer of medical images. However, the substantial file sizes associated with DICOM data present challenges in terms of storage and data transmission. Data reduction techniques help address these challenges by minimizing the size of the data while preserving its integrity. This thesis examines various compression methods aimed at reducing the size of DICOM files. We evaluate five lossless compressors and four lossy compressors on DICOM data to compare and assess their performance. Through an analysis of each compressor’s compression efficiency and resulting image …

Informing Management Of American Shad (Alosa Sapidissima) In The Carolinas: Evaluating Novel Fish Passage Approaches And Acoustic Tracking Methods, Margaret Gaither

All Theses

Acoustic telemetry is a valuable tool for fisheries scientists to study the movements and migratory behaviors of aquatic organisms. A critical assumption of this method is that tagged fish exhibit similar behaviors and survival rates as their untagged counterparts. To investigate this, we conducted a 12-week laboratory study on adult American Shad (Alosa sapidissima) using gastroesophageal insertion of acoustic transmitters. We implanted 80 fish with dummy transmitters and monitored tag retention and survival. Our analysis, employing a mixed effects Cox’s proportional hazards model, revealed no significant differences in survival between tagged and control fish, regardless of sex. Additionally, …

The Effect Of Packaging On The Acceptance Of Natural Peanut Butter, Perian M. Reese

All Theses

The aim was to determine the effect of packaging on the acceptance of natural peanut butter, especially concerning the acceptance of the undesirable oil layer. The jars of peanut butter differed by color, label size, and inclusion of qualifying statements. 119 participants across two groups completed this study. Both groups completed an eye-tracking study in a mock grocery setting. The first group rated all five jars in appearance, expected quality, and overall rating. They were given one sample cup of peanut butter and gave hedonic liking values for color, oiliness, peanut flavor, smoothness, sweetness, and overall liking. The second group …

On Humans, Hogs, And Habitat: How Landscape Features And Vegetation Influence Wild Hog (Sus Scrofa) Detection On Private Lands And Using Existing Wild Hog Outreach Websites To Create An Effective Website For South Carolina, Andrew Jamison

All Theses

Invasive species are a source of human conflict with wildlife on a global scale and exist to the detriment of native wildlife species. Invasive species often possess the ability to respond rapidly to change and they often exist alongside humans. Wild hogs (Sus scrofa) are perhaps one of the most infamous examples of an invasive species. The spread of wild hogs necessitates effective communication with the public being impacted by them, as well as a continuation of research to learn more about wild hog behavior to promote effective management. Chapter 1 focuses on how we created a website …

A Drosophila Model Of Mucopolysacchridosis Iiia, Rebecca Bishop

All Theses

Mucopolysaccharidosis IIIA (MPS IIIA) is a rare lysosomal storage disorder that arises from inability to break down heparan sulfate (HS) because of mutations in the N-sulfoglucosamine sulfohydrolase (SGSH) gene. We used a deletion mutant of the Drosophila melanogaster Sgsh gene along with three point mutations analogous to mutations observed in patients (S64W, L89P, S301P) to show an increase in the average percent of area with lysosomal puncta in the fly brains of our mutants using Lysotracker. RNA sequencing of brains of mutant and control flies showed 441 (Knockout), 337 (S64W), 155 (L89P), and 96 (S301P) differentially expressed …

Influence Of Hygrothermal Conditions Of The Bistability Of Asymmetric Carbon Fiber Laminate Composites, Celia Hill

All Theses

Carbon fiber-reinforced polymer (CFRP) laminates have widespread use in many industries because of their exceptional strength-to-weight ratio. Carbon fiber laminates following an asymmetric layup orientation can exhibit bistability meaning the laminate can exist at two stable geometric configurations. The morphing characteristics of bistable CRFP has a growing level of interest because of its potential in various applications including space aircraft structures for easy repair, automotive structures for energy dissipation and ergonomics, robotics for flexible motion and energy harvesting. Existing research shows that both moisture and temperature affect the material properties and behavior of CFRP laminates, however, the influence of moisture …

Bounding The Convex Hull Relaxation Of The Unit Commitment Problem With The Shapley-Folkman Theorem, Lauren Henderson

All Theses

The Unit Commitment (UC) problem finds an optimal schedule for a set of generators by minimizing the total operation cost subject to demand and operational constraints. The UC problem is often modeled with a mixed-integer linear program (MILP). We employ the Shapley-Folkman Theorem to provide a bound on the size of fractional solutions of its convex hull relaxation. This result is used to obtain a bound on the optimality gap between the MILP and the convex hull relaxation, which is further tightened using several problem-specific properties of UC. We conduct extensive numerical experiments to study the tightness of this threshold, …

Toward Electrochemical Detection Of Salmonella Enterica Serovar Enteritidis On Hydroponically Grown Green Onions (Allium Fistulosum L.), Lisseth Casso-Hartmann

All Theses

The Food and Drug Administration (FDA) established standards during the growing, harvesting, packing, and holding of produce for human consumption as part of implementing the Food Safety Modernization Act (FSMA). One of the main requirements for farmers is to detect environmental pathogens such as Salmonella enterica species in water and sprout samples. S. enterica is a bacterium of significant concern due to its pathogenicity and ability to survive and persist in diverse environmental conditions. S. enterica has been associated with recalls in ready-to-eat foods. Traditional detection methods include Enzyme-Linked Immunosorbent Assay (ELISA), Polymerase Chain Reaction (PCR), and plate counting, which …