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Articles 1081 - 1110 of 14647
Full-Text Articles in Entire DC Network
An Evaluation Of Thermocouple Reconstruction Techniques, Derek Brauneis
An Evaluation Of Thermocouple Reconstruction Techniques, Derek Brauneis
Electronic Theses and Dissertations, 2020-2023
Temperature measurements can be difficult to obtain across many different harsh environments such as engine combustion chambers, engine exhaust temperatures, and explosion fireballs. While there are alternate methods to measure fluid temperature such as laser measurements, acoustic measurements, and camera imaging techniques, these methods can often be expensive, difficult to implement, and not able to see within the environment. Thermocouples are popular sensors because they are cheap and easy to implement across a wide range of applications and can measure temperature in areas where other methods cannot reach or see. However, while these sensors are very popular and versatile, they …
Gait Strategies While Walking With Discrete Perturbations On A Self-Paced Treadmill, Cesar Castano
Gait Strategies While Walking With Discrete Perturbations On A Self-Paced Treadmill, Cesar Castano
Electronic Theses and Dissertations, 2020-2023
Introducing perturbations on a self-paced treadmill allows participants to experience uncertain environments without restricting their ability to continuously change their walking speed and kinematics. In this dissertation, I evaluated how different self-paced treadmill controller sensitivities affected gait parameters and variability on decline, level, and incline slopes. I also investigated how healthy young and older adults adjust their gait strategies when responding to perturbations of varying unpredictability and whether the changes in gait strategies remained once the perturbations were no longer present. Lastly, I evaluated how differences in gait kinematics when responding to visual and mechanical perturbations at varying frequencies. I …
Psychology Of Platonic Relationships, Amber V. Heinig
Psychology Of Platonic Relationships, Amber V. Heinig
Honors Undergraduate Theses
Romantic relationships (RR) regarding attachment styles and theory have been widely studied, whereas platonic relationships (PR) have received comparatively less attention in research. This study aims to explore two hypotheses: (1) individuals exhibit more avoidant behavior in platonic relationships rather than anxious behavior, and more anxious behavior in romantic relationships than in platonic ones; (2) attachment styles in platonic relationships manifest uniquely and can exist independently of romantic attachment. This research aims to better understand the way that attachment differs between both relationship types. Through a quantitative study involving a survey with a 5-point Likert scale measuring attachment, administered to …
Micro-Credentialing With Fuzzy Content Matching: An Educational Data-Mining Approach, Paul Amoruso
Micro-Credentialing With Fuzzy Content Matching: An Educational Data-Mining Approach, Paul Amoruso
Electronic Theses and Dissertations, 2020-2023
There is a growing need to assess and issue micro-credentials within STEM curricula. Although one approach is to insert a free-standing academic activity into the students learning and degree path, herein the development and mechanism of an alternative approach rooted in leveraging responses on digitized quiz-based assessments is developed. An online assessment and remediation protocol with accompanying Python-based toolset was developed to engage undergraduate tutors who identify and fill knowledge gaps of at-risk learners. Digitized assessments, personalized tutoring, and automated micro-credentialing scripts for Canvas LMS are used to issue skill-specific badges which motivate the learner incrementally, while increasing self-efficacy. This …
Discovering Vulnerabilities And Designing Trustworthy Defenses In Iot Systems And Devices, Bryan Pearson
Discovering Vulnerabilities And Designing Trustworthy Defenses In Iot Systems And Devices, Bryan Pearson
Electronic Theses and Dissertations, 2020-2023
Internet of Things (IoT) dominates many functions in the modern world, from sensing and reporting temperature, humidity, and air quality, to controlling and automating homes, commercial buildings, and equipment. However, IoT systems have received scrutiny in recent years due to countless security incidents, which can have physical and even deadly consequences. This research provides a comprehensive assessment of the security of IoT systems and devices, including low-cost microcontroller (MCU) based sensors, cloud services, and Building Automation Systems (BAS). We begin by exploring the current landscape of vulnerabilities and defenses in modern IoT applications. We show that many security needs can …
Developing Cost-Effective Specialty Adsorbents To Meet The Emerging Challenges Of Pollutant Removal In Surface Water Systems, Diana Ordonez
Developing Cost-Effective Specialty Adsorbents To Meet The Emerging Challenges Of Pollutant Removal In Surface Water Systems, Diana Ordonez
Electronic Theses and Dissertations, 2020-2023
The production of clean water is emphasized under the United Nations goals for sustainable development (SDGs), enlightening the acute need of developing new sustainable technologies in all disciplines. SDGs have urged all engineers in the 21st century to mitigate pollution of drinking water sources and prevent all receiving waterbodies from the impact of agriculture discharge, wastewater effluent, and stormwater runoff. Current water matrix constituents of concern include traditional pollutants (i.e., total nitrogen and total phosphate), natural organic matters (i.e., total organic carbon (TOC), tannic acid), heavy metals (i.e., copper, calcium), and harmful algae toxins (i.e., microcystin), as well as contaminants …
Auto-Ignition Characteristics Of Hydrogen Enriched Natural Gas For Gas Turbine Applications, Christopher T. Loving
Auto-Ignition Characteristics Of Hydrogen Enriched Natural Gas For Gas Turbine Applications, Christopher T. Loving
Graduate Thesis and Dissertation 2023-2024
A successful transition to clean energy hinges on meeting the world's growing energy demand while reducing greenhouse gas emissions. Achieving this will require significant growth in electricity generation from clean and carbon-free energy sources. Several energy providers have already begun the transition from traditional carbon-based fuels to cleaner alternatives, such as hydrogen and hydrogen enriched natural gas. However, there are still many technical challenges that must be addressed when applying these fuels in gas turbines. The application of hydrogen or hydrogen/natural gas blends to advanced class gas turbines, which have higher operating pressures and temperatures has raised concerns about the …
Laser Powder Bed Fusion Of Bimetallic Structures, Asif Mahmud
Laser Powder Bed Fusion Of Bimetallic Structures, Asif Mahmud
Graduate Thesis and Dissertation 2023-2024
Laser powder bed fusion (LPBF) is a popular additive manufacturing (AM) technique that has demonstrated the capability to produce sophisticated engineering components. This work reports the crack-free fabrication of an SS316L/IN718 bimetallic structure via LPBF, along with compositional redistribution, phase transformations and microstructural development, and nanohardness variations. Constituent intermixing after LPBF was quantitatively estimated using thermo-kinetic coefficients of mass transport and compared with the diffusivity of Ni in the austenitic Fe-Ni system. The intermixing of primary solvents (Ni and Fe) in SS316L/IN718 bimetallic structures was observed for an intermixing zone of approximately 800 µm, and their intermixing coefficient was estimated …
The Impact Math Interventions Have On Student Achievement In An Urban School Setting, Jennifer A. Bellinger
The Impact Math Interventions Have On Student Achievement In An Urban School Setting, Jennifer A. Bellinger
Graduate Thesis and Dissertation 2023-2024
Intense intervention is needed for students who have persistent math challenges and perform below grade level. In the classroom setting, teachers need to provide additional support for some students based on their specific needs. This correlational study was an examination of interventions' impact on student achievement in math. The sample comprised students enrolled in Algebra I during the 2021–2022 school year. The results of this study showed that interventions may have a positive impact on student performance, especially when carried out in the proper educational setting. The findings from the research showed that there is no significant statistical correlation between …
Integrated Frequency Combs For Applications In Optical Communications & Microwave Photonics, Chinmay Shirpurkar
Integrated Frequency Combs For Applications In Optical Communications & Microwave Photonics, Chinmay Shirpurkar
Electronic Theses and Dissertations, 2020-2023
This dissertation reviews the advancements made in chip-scale optical frequency combs and their applications towards optical communications and optical to RF links. We review different chip-scale comb sources and in particular, chip-scale Kerr microresonator frequency combs. Then, we establish the theoretical background in nonlinear optics which allows the formation and stabilization of Kerr solitons in nonlinear cavities. We also discuss the concept of optical injection locking and in particular, multi-tone injection locking which precedes the idea of regenerative harmonic injection locking. We then go on to show the experimental work involved in soliton generation and characterization. We show efforts towards …
Smart Mobility Sensing Of Origin-Destination Pairs Using Computer Vision, Seyed Sina Shid Moosavi
Smart Mobility Sensing Of Origin-Destination Pairs Using Computer Vision, Seyed Sina Shid Moosavi
Electronic Theses and Dissertations, 2020-2023
The measurement of the origin-destination (OD) flow of individual passengers within the public transportation system plays a vital role in understanding resident mobility and facilitating route planning. Particularly in resource-limited communities, where access to advanced technologies like smart card systems may not be available, bus transportation systems play a crucial role in daily life. Traditional methods, such as driver logs, are not only time-consuming but also difficult to provide precise measurements of individualized OD pairs. Therefore, the primary objective of this study is to propose an automatic passenger sensing system (software) capable of accurately measuring OD pairs for individual passengers …
It Is Time To Change The Way We Change, Thane Keller
It Is Time To Change The Way We Change, Thane Keller
Electronic Theses and Dissertations, 2020-2023
Seventy percent of organizational change initiatives fail. Among organizations where change and adaptation are necessary for survival, the U.S. military stands at the top. The disparity between desired health and fitness behaviors and actual behaviors is a glaring reminder that change is difficult to implement and that current change systems struggle. Merit-based systems offer a solution by rewarding and reinforcing good behavior to generate lasting change. This paper evaluates Kotter's Change Model and Nudge Theory and found them insufficient because they do not sufficiently address reinforcement learning or the temporal tie between behaviors and rewards for reinforcement. This paper then …
Capturing And Scaffolding The Complexities Of Self-Regulation During Game-Based Learning, Daryn Dever
Capturing And Scaffolding The Complexities Of Self-Regulation During Game-Based Learning, Daryn Dever
Electronic Theses and Dissertations, 2020-2023
Game-based learning environments (GBLEs) can offer students with engaging interactive instructional materials while also providing a research platform to investigate the dynamics and intricacies of effective self-regulated learning (SRL). Past research has indicated learners are often unable to monitor and regulate their cognitive and metacognitive processes within GBLEs accurately and effectively on their own due mostly to the open-ended nature of these environments. The future design and development of GBLEs and embedded scaffolds, therefore, require a better understanding of the discrepancies between the affordances of GBLEs and the required use of SRL. Specifically, how to incorporate interdisciplinary theories and concepts …
Structural Transformations In Photo-Thermo-Refractive Glass For Hologram Recording, Roberto Alejandro Alvarez Aguirre
Structural Transformations In Photo-Thermo-Refractive Glass For Hologram Recording, Roberto Alejandro Alvarez Aguirre
Electronic Theses and Dissertations, 2020-2023
This dissertation focuses on the structural transformations in photo-thermo-refractive (PTR) glass that enable recording phase holograms for efficient transformation of optical beams and high resolution spectroscopy. PTR glass is a multicomponent silicate matrix doped with Ce, Ag, Sn and Sb. It is a holographic phase medium with the ability of permanent refractive index change after UV exposure and thermal development above 500°C due to the precipitation of a NaF crystalline phase. Electronic processes are studied by analyzing the structure of absorption and luminescence bands of PTR glass matrix and its dopants. We analyze the structural transformations in PTR glass from …
Identification And Modeling Social Media Influence Pathways: A Characterization Of A Disinformation Campaign Using The Flooding-The-Zone Strategy Via Transfer Entropy, Jasser Jasser
Electronic Theses and Dissertations, 2020-2023
The internet has made it easy for narratives to spread quickly and widely without regard for accuracy or the harm they may cause to society. Unfortunately, this has led to the rise of bad actors who use fake and misleading articles to spread harmful misinformation. These actors flood the information space with low-quality articles in an effort to disrupt opposing narratives, sow confusion, and discourage the pursuit of truth. In societies that prioritize free speech, maintaining control over the information space remains a persistent challenge. Achieving this requires strategic planning to protect the dissemination of information in ways that promote …
Development,Validation, And Integration Of Ai-Driven Computer Vision System And Digital-Twin System For Traffic Safety Dignostics, Ou Zheng
Electronic Theses and Dissertations, 2020-2023
The use of data and deep learning algorithms in transportation research have become increasingly popular in recent years. Many studies rely on real-world data. Collecting accurate traffic data is crucial for analyzing traffic safety. Still, traditional traffic data collection methods that rely on loop detectors and radar sensors are limited to collect macro-level data, and it may fail to monitor complex driver behaviors like lane changing and interactions between road users. With the development of new technologies like in-vehicle cameras, Unmanned Aerial Vehicle (UAV), and surveillance cameras, vehicle trajectory data can be collected from the recorded videos for more comprehensive …
Active Photonic Integrated Devices And Circuits On Thin-Film Lithium Niobate Platform, Ehsan Ordouie
Active Photonic Integrated Devices And Circuits On Thin-Film Lithium Niobate Platform, Ehsan Ordouie
Electronic Theses and Dissertations, 2020-2023
This thesis delves into innovative active photonic integrated devices and circuits on the thin-film lithium niobate (TFLN) platform, focusing on their applications and potential future advancements. We introduce a new family of electrooptic modulators (EOMs), the Four-Phase Electrooptic Modulators (FEOMs), which are fabricated using the TFLN platform. These devices effectively mitigate bandwidth and dynamic-range constraints in optical communication systems by reducing dispersion penalties and common-mode noises. Their functionality is demonstrated in a photonic time-stretch system. A dual-polarization variant further exemplifies the mitigation of both dispersion penalties and common-mode noises in long-haul communication links, marking significant strides towards the practical implementation …
Using Gis To Better Understand The Cracker Community Of Pat's Island In The Ocala National Forest, Florida, Nicholas Kopp
Using Gis To Better Understand The Cracker Community Of Pat's Island In The Ocala National Forest, Florida, Nicholas Kopp
Electronic Theses and Dissertations, 2020-2023
This research uses GIS methods to contextualize a Florida Cracker community in the Ocala National Forest. My case study is drawn from two seasons of fieldwork and supporting desktop surveys associated with Pat's Island, the home of multiple Cracker families. Cracker culture is historically categorized by its efforts to avoid modernization and prevent the commercialization of traditional lifeways in the quickly shifting society of late-19th and early 20th-century Florida. The geospatial expressions of these Cracker values are an emphasis on semi-remote living, adaptations to a unique environmental context, and the development of a semi-self-sufficient community. This research evaluates how GIS …
The Narratives Of Sexulization: The Perspectives Of Young Entertainers Around Their Own Public Sexulizaiton, Alexis Williams
The Narratives Of Sexulization: The Perspectives Of Young Entertainers Around Their Own Public Sexulizaiton, Alexis Williams
Electronic Theses and Dissertations, 2020-2023
Sexualization happens when agency is taken away from the individual being sexualized, where one is seen, depicted, and treated like a sexual object rather than a person. This thesis aims to explore celebrities' reactions to their own public sexualization. To do this, an inductive approach was used when analyzing first-person narratives (written and video) and interviews (podcast, magazine and newspaper) by those whose sexualization is a notable feature of their career in the United States. I used a nonprobability sampling technique in order to cast a wide net to find the sample (prior knowledge, Google searches, and Google alerts). This …
Investigation Of Endothelial Mechanics On Primary Cell Functions: Endothelium Permeability And Wound Healing, Sean Beverung
Investigation Of Endothelial Mechanics On Primary Cell Functions: Endothelium Permeability And Wound Healing, Sean Beverung
Electronic Theses and Dissertations, 2020-2023
The endothelium composes the inner lining of blood vessels, the heart, and lymphatic vessels. Within the cardiovascular system, it is an extremely important structure, aiding in the regulation of blood pressure with the vascular tone, recruiting immune response, regulating the transfer of material in and out of the bloodstream, and the creation of new blood vessels through angiogenesis. The endothelium is composed entirely of endothelial cells. These cells lay in a flat squamous formation and are in direct contact with blood and aid in the regulation and transfer of material in and out of the bloodstream via active and passive …
Nanostructured Alloy Thin Film Fabrication And Application For Zinc-Air Battery And Lithium-Ion Battery, Guanzhi Wang
Nanostructured Alloy Thin Film Fabrication And Application For Zinc-Air Battery And Lithium-Ion Battery, Guanzhi Wang
Electronic Theses and Dissertations, 2020-2023
The depletion of unsustainable fossil fuels and growing environmental issues have given rise to scientific challenges and research interests in the development of renewable energy technologies to meet the rising global energy demand. Electrochemical energy storage and conversion technologies (ESCTs), such as lithium-ion batteries, metal-air batteries, supercapacitors, and fuel cells, etc., offer a clean and sustainable strategy for utilizing energy. As the core components, the electrode materials, including anodes, cathodes, and catalysts, play a direct decisive role in the device's performance in practical application. Therefore, the development of high-performance and low-cost electrode materials is critical for the success of these …
Electroanalytical Investigations Of Microrna-Conjugated Cerium Oxide Based Nanomaterials For Biomedical Applications, Chaimae El Ghzaoui
Electroanalytical Investigations Of Microrna-Conjugated Cerium Oxide Based Nanomaterials For Biomedical Applications, Chaimae El Ghzaoui
Electronic Theses and Dissertations, 2020-2023
Diabetes patients are increasingly suffering from wound-healing impairments coupled with other severe medical conditions. High levels of oxidative stress and proinflammatory cytokines are predominant pathologic characteristics of diabetic wounds. Applying microRNA (miRNA) in gene therapy often successfully treats various disorders by generating highly specific bio-responses. Studies revealed that microRNA146a (miR146a), a regulator of inflammation, is downregulated in diabetic wounds. However, miR203 is found to be highly-expressed in diabetic foot ulcers in positive correlation with disease severity. We have synthesized Cerium oxide nanoparticles (CNPs) since they are used in various biomedical applications due to their high enzyme-mimetic activities and reactive oxygen …
Rotorcraft Lander Fixed To A Descending Capsule Backshell, Corey Zucker
Rotorcraft Lander Fixed To A Descending Capsule Backshell, Corey Zucker
Electronic Theses and Dissertations, 2020-2023
NASA is financing a mission to study the surface of Titan, Saturn's largest moon, to investigate the terrain, chemical compositions, and potential for existent life. This mission is an exciting advancement from Mars Ingenuity, because the quadrotor lander, Dragonfly, will be the first of its kind with four coaxial rotors. Upon entry into Titan, and at near surface atmospheric conditions, Dragonfly will exit a parachute supported backshell that has shed its protective heatshield. The aerodynamics of this state are significant in comprehending the dynamics of the overall system for successful deployment into powered flight. The studies presented here examine the …
Hypersonic Aero-Optic Measurements In A High-Pressure Shock Tube, Jonathan P. Mcgaunn
Hypersonic Aero-Optic Measurements In A High-Pressure Shock Tube, Jonathan P. Mcgaunn
Graduate Thesis and Dissertation 2023-2024
The high-pressure shock tube facility (HiPER-STAR) at the University of Central Florida (UCF) is analyzed experimentally to demonstrate the practicality of hypersonic aero-optical testing in an impulse facility without the use of an expansion nozzle or acceleration tube. The investigation analyses driver gas blending with helium and hydrogen to raise the speed of sound ratio in an attempt to increase the Mach number for aero-optics testing. HiPER-STAR has a unique ability to withstand pressures up to 1000 atm and run in a double diaphragm configuration allowing for a significant pressure differential to be created between the driver and driven sections. …
Anatomically-Guided Deep Learning For Left Ventricle Geometry Reconstruction And Cardiac Indices Analysis Using Mr Images, Andre Von Zuben
Anatomically-Guided Deep Learning For Left Ventricle Geometry Reconstruction And Cardiac Indices Analysis Using Mr Images, Andre Von Zuben
Graduate Thesis and Dissertation 2023-2024
Recent advances in deep learning have greatly improved the ability to generate analysis models from medical images. In particular, great attention is focused on quickly generating models of the left ventricle from cardiac magnetic resonance imaging (cMRI) to improve the diagnosis and prognosis of millions of patients. However, even state-of-the-art frameworks present challenges, such as discontinuities of the cardiac tissue and excessive jaggedness along the myocardial walls. These geometrical features are often anatomically incorrect and may lead to unrealistic results once the geometrical models are employed in computational analyses. In this research, we propose an end-to-end pipeline for a subject-specific …
Investigating Shallow Neural Networks For Orbit Propagation Deployed On Spaceflight-Like Hardware, Hunter Quebedeaux
Investigating Shallow Neural Networks For Orbit Propagation Deployed On Spaceflight-Like Hardware, Hunter Quebedeaux
Graduate Thesis and Dissertation 2023-2024
Orbit propagation is the backbone of many problems in the space domain, such as uncertainty quantification, trajectory optimization, and guidance, navigation, and control of on orbit vehicles. Many of these techniques can rely on millions of orbit propagations, slowing computation, especially evident on low-powered satellite hardware. Past research has relied on the use of lookup tables or data streaming to enable on orbit solutions. These solutions prove inaccurate or ineffective when communication is interrupted. In this work, we introduce the use of physics-informed neural networks (PINNs) for orbit propagation to achieve fast and accurate on-board solutions, accelerated by GPU hardware …
Temperature And H2o Species Measurements Via A Laser Spectroscopic Sensor In Harsh Reacting Environments, Marc B. Etienne
Temperature And H2o Species Measurements Via A Laser Spectroscopic Sensor In Harsh Reacting Environments, Marc B. Etienne
Graduate Thesis and Dissertation 2023-2024
Reactive material liners paired with high explosives can significantly increase blast effects. This research aims to study the properties that primarily control the interaction between reactive materials (RM) and high explosives (HE). This will facilitate blast performance optimization for the RM and HE combinations. A laser spectroscopic sensor will be utilized to measure the performance of these RM and HE combinations. Laser absorption spectroscopy (LAS) is a technique that measures the chemical concentration of a medium through the intensity change of the laser beam. The laser diagnostic instrument is composed of two tunable diode lasers, one centered at 2.48 μm …
Thermal Management Strategies For Hypersonic Flight: Supercritical Co2 Jet Impingement Cooling Investigation For Leading Edge, Manoj Prabakar Sargunaraj
Thermal Management Strategies For Hypersonic Flight: Supercritical Co2 Jet Impingement Cooling Investigation For Leading Edge, Manoj Prabakar Sargunaraj
Graduate Thesis and Dissertation 2023-2024
This study addresses the critical need for effective thermal management in hypersonic vehicles facing intense heat at their leading edge due to high enthalpy flow. The objective is to propose an active impingement cooling system that ensures the structural stability and performance of these vehicles. This dissertation presents an in-depth exploration of the numerical simulations conducted on the hypersonic leading edge, focusing on a 3mm radius with active cooling utilizing supercritical carbon dioxide (sCO2) as the coolant. The research incorporates conjugate simulations that merge external hypersonic flow and sCO2 active cooling. Utilizing a thermodynamic non-equilibrium two-temperature model and various chemical …
A Novel Multi-Observer Orbit Determination And Estimation Framework For Cislunar Space Domain Awareness, James E. Hippelheuser Jr.
A Novel Multi-Observer Orbit Determination And Estimation Framework For Cislunar Space Domain Awareness, James E. Hippelheuser Jr.
Graduate Thesis and Dissertation 2023-2024
This work presents a measurement model designed for multiple observers (space-based and/or ground-based) for cislunar orbit determination and estimation for space domain awareness (SDA). The measurement model is able to rely solely on angles-only measurements by defining the line between the observer and the target object as the intersection of two non-parallel planes. There are two primary applications for the measurement model related to cislunar SDA: (1) It provides a new initial orbit determination (IOD) technique that does not require any knowledge of the dynamical environment, and (2) It is adopted into a sequential estimation scheme to provide continuous orbit …
Modeling And Experimental Validation Of Mission-Specific Prognosis Of Li-Ion Batteries With Hybrid Physics-Informed Neural Networks, Kajetan Fricke
Modeling And Experimental Validation Of Mission-Specific Prognosis Of Li-Ion Batteries With Hybrid Physics-Informed Neural Networks, Kajetan Fricke
Graduate Thesis and Dissertation 2023-2024
While the second part of the 20th century was dominated by combustion engine powered vehicles, climate change and limited oil resources has been forcing car manufacturers and other companies in the mobility sector to switch to renewable energy sources. Electric engines supplied by Li-ion battery cells are on the forefront of this revolution in the mobility sector. A challenging but very important task hereby is the precise forecasting of the degradation of battery state-of-health and state-of-charge. Hence, there is a high demand in models that can predict the SOH and SOC and consider the specifics of a certain kind of …