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The Effect Of Technological Advancements On Interactions In The Agricultural Commodities Market, Savannah B. Armas Jan 2022

The Effect Of Technological Advancements On Interactions In The Agricultural Commodities Market, Savannah B. Armas

Honors Undergraduate Theses

The objective of this research is to find, if and how, real and financial technological advancements influence interactions in the agricultural commodities market. Statistical testing was conducted to identify potential correlation and any positive linear relationships in the price data between agricultural commodities and their complementary agricultural chemical producers. Testing if higher trade volumes in this industry result from higher technology usage were initiated by identifying shared linear growth between general index volumes and agricultural commodities, alongside their chemical complement stock volumes. The scientific development of chemical engineering mirrors financial technologies influencing trader behavior as a significant contributor to agricultural …

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Differential Workload Levels For Primary And Secondary Tasks Using Virtual Reality, Ritesh Chandrasekaran Jan 2022

Differential Workload Levels For Primary And Secondary Tasks Using Virtual Reality, Ritesh Chandrasekaran

Honors Undergraduate Theses

Virtual reality (VR) has modernized the way that training has been done across multiple domains. Combining the benefits of using VR with the ability to measure workload levels from eye tracking data is a promising area of opportunity for all disciplines and jobs that require hands-on training. With VR becoming of increasing interest for optimizing training simulations and protocols for work around the world, this study aims to determine differential workload levels in virtual reality by using objective performance data in a simulation and subjectively assessing workload through the NASA-TLX survey. For this study, a 3x1 repeated measures ANOVA was …

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Methods For Characterization Of Cl-001 Derived Exosomes As A Stimulating Agent For Nk Cells For Immunotherapy, Ilana Gomez Diaz Jan 2022

Methods For Characterization Of Cl-001 Derived Exosomes As A Stimulating Agent For Nk Cells For Immunotherapy, Ilana Gomez Diaz

Honors Undergraduate Theses

The immune system is a complex set of cells in the body that work to prevent disease or infection by recognizing and eliminating foreign material or unhealthy cells. One essential type of immune cell that is part of the innate immune response are Natural Killer (NK) cells. These cytotoxic effector lymphocytes can detect certain unhealthy cells, such as cancer cells, that normal B and T cells would miss. For example, many tumor cells have evolved to bypass immune system surveillance by not expressing major histocompatibility complex class I molecules (MHC class I), on their surface, reducing recognition by cytotoxic T …

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Investigating Ground Interactions Of A Rotocraft Landing Vehicle On Titan, Adam Rozman Jan 2022

Investigating Ground Interactions Of A Rotocraft Landing Vehicle On Titan, Adam Rozman

Honors Undergraduate Theses

The exploration of celestial bodies has recently advanced from rovers to rotorcraft. This includes the recent flights of Mars Ingenuity and the upcoming Dragonfly mission to explore the terrain of Saturn’s moon Titan as part of NASA’s New Frontiers Program. Flight-based landers can travel quickly to sites kilometers apart and land in complex terrain. Although cruise conditions for these rotorcrafts are well understood, studies are necessary to understand take-off and landing. In ground effect conditions, a rotor wake impinges and reflects off the ground, creating changes in aerodynamics such as increased lift. Additionally, operating over loose surfaces, the rotors can …

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The Pardon Paradigm: The Presidential Pardons Of Donald J. Trump, Hlynur Saemundsson Jan 2022

The Pardon Paradigm: The Presidential Pardons Of Donald J. Trump, Hlynur Saemundsson

Honors Undergraduate Theses

The presidential pardon power is an oft-overlooked political institution that seems to be perceived as being innocuous and irrelevant to larger political concerns. This research examines the pardons issued by President Donald J. Trump in an effort to evaluate whether they align with constitutional expectations regarding the use of this unrestricted presidential power. Dr. Jeffrey Crouch, a leading scholar on the subject, has demonstrated that the pardon power was intended to be used as a disinterested act of grace or an act in the public interest. A close survey of President Trump’s use of this power shows that many of …

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Investigation Of Dna Hybridization In Localized Systems In Close Proximity, Ashley M. Sewsankar Jan 2022

Investigation Of Dna Hybridization In Localized Systems In Close Proximity, Ashley M. Sewsankar

Honors Undergraduate Theses

Hybridization of two or more DNA or RNA strands is well documented for the process taking place with all strands free in solution or when one strand is immobilized on a substrate. This study contributes to the investigation of the hybridization process when two single DNA strands (ssDNA) are in close proximity. We took advantage of an X sensor in which hybridization of four DNA strands enables the formation of a DNA four-way junction (crossover or X) structure. We immobilized multiple layers of crossover structures to study its hybridization being triggered by short ssDNA coming from solution and further investigate …

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The Cost, Politics And Controversy Of Human Space Flight In Nigeria Or How To Put The First African Astronaut Into Space, Desiree Winns Jan 2022

The Cost, Politics And Controversy Of Human Space Flight In Nigeria Or How To Put The First African Astronaut Into Space, Desiree Winns

Honors Undergraduate Theses

The most pressing barriers between reality and the dream of the first African astronaut in space are a lack of resources, cooperation, and support. However, Nigeria presently suffers from the threat of famine, intercommunal violence, and population displacement as a result of terrorism and food insecurity. The reliance upon humanitarian aid from countries such as the United States and international NGOs creates a question of whether Nigeria should even be considering exploration of space. It can be said that any investment into space should instead be granted to displaced people, water and food security, and cracking down on terrorism. Why …

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Investigation Of Pitching And Plunging Motions On A Tandem Wing Configuration, Riley M. Capiro Jan 2022

Investigation Of Pitching And Plunging Motions On A Tandem Wing Configuration, Riley M. Capiro

Honors Undergraduate Theses

From the beginning of the history of flight, inspiration has been drawn from nature. Evolution has spent millions of years optimizing creatures that rely on flight as their means of locomotion. Today, aerial vehicles are very different to those from the time of the Wright brothers. One kind of vehicle that stands to benefit in mimicking nature is the drone, particularly smaller drones. Commonly used today by militaries, industry and civilians, drones are increasingly affordable while also decreasing in size thanks to advancements in electronics and manufacturing methods. The purpose of this thesis is to investigate how pitching and rolling …

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Mental Health Of Puerto Ricans Who Stayed In Puerto Rico Compared To Those Who Migrated To Florida After Hurricane Maria, Sophia Chapdelaine Jan 2022

Mental Health Of Puerto Ricans Who Stayed In Puerto Rico Compared To Those Who Migrated To Florida After Hurricane Maria, Sophia Chapdelaine

Honors Undergraduate Theses

September 20th, 2017 was a devastating day for many Puerto Ricans as Hurricane Maria made landfall in Puerto Rico. A majority of people were left without electricity, water, transportation, and communication between friends and family. In addition, many experienced losses such as destruction of their home and personal belongings as well as the death of family members and friends. This resulted in a decline in mental health. According to previous literature, key indicators of poor mental health in Puerto Rico after Hurricane Maria were increased diagnoses of depression, anxiety, and Post Traumatic Stress Disorder (PTSD). This study provides a comprehensive …

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Genetic Algorighm Representation Selection Impact On Binary Classification Problems, Stephen V. Maldonado Jan 2022

Genetic Algorighm Representation Selection Impact On Binary Classification Problems, Stephen V. Maldonado

Honors Undergraduate Theses

In this thesis, we explore the impact of problem representation on the ability for the genetic algorithms (GA) to evolve a binary prediction model to predict whether a physical therapist is paid above or below the median amount from Medicare. We explore three different problem representations, the vector GA (VGA), the binary GA (BGA), and the proportional GA (PGA). We find that all three representations can produce models with high accuracy and low loss that are better than Scikit-Learn’s logistic regression model and that all three representations select the same features; however, the PGA representation tends to create lower weights …

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The Early Propagation And Burning Of Hydrogen In The Process Of The Deflagration To Detonation Transition, Rom Amasay Jan 2022

The Early Propagation And Burning Of Hydrogen In The Process Of The Deflagration To Detonation Transition, Rom Amasay

Honors Undergraduate Theses

The safe and efficient propagation of the Deflagration to Detonation Transition (DDT) is a topic that has been researched for many years due to its applications in Aerospace and Mechanical Engineering. DDT is when fire caused by the burning of fuel is accelerated to the upper CJ point on the Rankine Hugoniot curve due to instabilities in the flame and the turbulence caused by these instabilities. The complex flame dynamics that go along with DDT have ensured that the process is yet to be fully understood and defined. This research will work towards observing the early stages of burning hydrogen-air …

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Seasonality And Lanscape Management In The Bolivian Amazon: Landsat Imagery Analysis Of The Quinato Wetland, Jackie Beery Jan 2022

Seasonality And Lanscape Management In The Bolivian Amazon: Landsat Imagery Analysis Of The Quinato Wetland, Jackie Beery

Honors Undergraduate Theses

The Quinato wetland, a remnant of a Pleistocene river course through northeastern Bolivia, has undoubtedly been the site of human landscape modification and domestication by pre-Columbian peoples. A 2021 study suggests that these modification practices, which have been tied to seasonal adaptation, were quite different between areas of the wetland. In response to these findings, the present study uses unsupervised classifications from the 50-year span of existent Landsat satellite imagery data, dating from 1972 to 2022, to create a chronological profile of the wetland. This record allows for the assessment of how yearly, seasonal changes to wetland growth and shrinkage …

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Photocatalytic Hydrogen Production Over Boron Rich Solids, Emma E. Blanco Jan 2022

Photocatalytic Hydrogen Production Over Boron Rich Solids, Emma E. Blanco

Honors Undergraduate Theses

The greenhouse emission produced from the combustion of fossil fuels, such as methane (CH4­) and carbon dioxide (CO2), are linked to global warming crisis because of their ability to absorb heat emitted to space by the Earth’s atmosphere. Over the last century, methane is estimated to have the Global Warming Potential (GWP) estimated to be 28-36 times larger than carbon dioxide. Although it is released in smaller quantities, methane traps nearly 90 times more heat than CO2. While recent research efforts has focused on the capture and conversion of CO2, these efforts …

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Atomization Of A Liquid Water Jet In Crossflow At Varying Hot Temperatures For High-Speed Engine And Stratospheric Aerosol Injection Applications, Luke Caetano Jan 2022

Atomization Of A Liquid Water Jet In Crossflow At Varying Hot Temperatures For High-Speed Engine And Stratospheric Aerosol Injection Applications, Luke Caetano

Honors Undergraduate Theses

This paper aims to study how varying crossflow burning temperatures from 1100 C to 1800 C affect the liquid droplet breakup, size distribution, and atomization of a liquid water jet injected into a vitiated crossflow. The LJIC injection mechanism was implemented using the high-pressure axially staged combustion facility at the University of Central Florida. The measurement devices used to gather particle data from the exhaust plume were the TSI Aerodynamic Particle Sizer (APS), which measures particles between 0.523 µm and 20 µm, and the Sensirion SPS30 (SPS30), which measures particles between 0.3 µm and 10 µm. Both measurement devices were …

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Intrinsically Mode Reconfigurable Load Modulation Balanced Amplifier Leveraging Transistor's Analog-Digital Duality, Niteesh Bharadwaj Vangipurapu Jan 2022

Intrinsically Mode Reconfigurable Load Modulation Balanced Amplifier Leveraging Transistor's Analog-Digital Duality, Niteesh Bharadwaj Vangipurapu

Electronic Theses and Dissertations, 2020-2023

The communication schemes have rapidly changed the face of the human means of communication. The evolution from one generation to another has triggered many challenges on the design methodologies of RF designers. As the evolution ensued, the spectrally efficient modulation schemes have resulted in the substantial rise of PAPR, the peak-to-average power ratio. To enable the efficient amplification of the high PAPR signals, this thesis explores the areas of Load modulated Balanced amplifiers that can be inherently reconfigured to achieve a better efficiency than the conventional RF power amplifiers that see a significant drop in the efficiency as the signal …

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Static Analysis Of The Build System To Accelerate Continuous Testing Of Highly Configurable Software, Necip Fazil Yildiran Jan 2022

Static Analysis Of The Build System To Accelerate Continuous Testing Of Highly Configurable Software, Necip Fazil Yildiran

Electronic Theses and Dissertations, 2020-2023

Continuous testing is widely used for facilitating fast and reliable software delivery. However, build-time configurability makes such testing harder for configurable software. As configurable software forms the basis of much of our computing infrastructure, there is even more need for better continuous testing for configurable software. In this dissertation, our goal is to improve the quality of configurable software. To this end, we tackle two, previously unsolved problems. The build system of configurable software is one of the biggest reasons why testing configurable software is hard. Therefore, in our solutions, we deal with the build system by using a comprehensive …

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Autoignition Delay Time Measurements And Chemical Kinetic Modeling Of Hydrogen/Ammonia/Natural Gas Mixtures, Jessica Baker Jan 2022

Autoignition Delay Time Measurements And Chemical Kinetic Modeling Of Hydrogen/Ammonia/Natural Gas Mixtures, Jessica Baker

Electronic Theses and Dissertations, 2020-2023

In recent years, hydrogen-carrying compounds have accrued interest as an alternative to traditional fossil fuels due to their function as zero-emission fuels. As such, there is interest in investigating hydrogen-carrying compounds to improve understanding of the fuels' characteristics for use in high pressure systems. In the current study, the oxidation of ammonia/natural gas/hydrogen mixtures was carried out to study CO formation profiles as well as the ignition delay times behind reflected shock waves in order to refine chemical kinetic models. Experiments were carried out in the University of Central Florida's shock tube facility by utilizing chemiluminescence to obtain OH* emission …

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Broadband Power Amplifier Design With High Power, High Efficiency And Large Back-Off Range, Yuchen Cao Jan 2022

Broadband Power Amplifier Design With High Power, High Efficiency And Large Back-Off Range, Yuchen Cao

Electronic Theses and Dissertations, 2020-2023

As modern communication system technology develops, the demand for devices with smaller size, higher efficiency, and larger bandwidth has increased dramatically. To achieve this purpose, a novel architecture of load modulated balanced amplifier (LMBA) with a unique load-modulation characteristic different from any existing LMBAs and Doherty power amplifiers (DPAs) was presented, which is named as Pseudo-Doherty LMBA (PD-LMBA). Based on a special combination of control amplifier (carrier) and balanced amplifier (peaking) together with proper phase and amplitude controls, an optimal load-modulation behavior can be achieved for PD-LMBA leading to maximized efficiency over extended power back-off range. More importantly, the efficiency …

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Analysis Of Shear Failure In Ultra-High Performance Concrete Beams, Kevin Conway Jan 2022

Analysis Of Shear Failure In Ultra-High Performance Concrete Beams, Kevin Conway

Electronic Theses and Dissertations, 2020-2023

Ultra-high performance concrete (UHPC) is an emerging cementitious material type currently undergoing research in different structural applications. This material is characterized by a compressive strength of 150 MPa (22 ksi), according to the Association Francaise de Genie Civil and the Federal Highway Administration, high tension strength, and high durability. Additionally, UHPC consists of secondary reinforcement in the form of steel or polymeric fibers, which enable UHPC to exhibit tension hardening behavior and tension ductility previously ignored in conventional concrete mixes. Previous research has focused on applications in the transportation and bridge design industries; however, applications in buildings and other heavy …

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Shock Tube And Gas Dynamic Design Considerations And Implementation For Extended Test Times, Jacklyn Higgs Jan 2022

Shock Tube And Gas Dynamic Design Considerations And Implementation For Extended Test Times, Jacklyn Higgs

Electronic Theses and Dissertations, 2020-2023

A new shock tube test section has been designed and manufactured for the purpose of increasing the test time and expanding the applications of the shock tube for a multitude of ongoing and future projects. One purpose for the test section extension is to allow for flow visualization of droplets impacted by a shock wave for the interaction of hypersonic vehicles and atmospheric disturbances. Another purpose is to measure behind the incident shock to capture the chemical kinetics for a high-altitude environment and low-pressure, high-temperature space applications. This new test section contains 24 round optical ports for laser spectroscopy for …

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Reporter Chondrocyte Optimization Of Bioinks For Zonal 3d Bioprinting Of Cartilage, Kari Martyniak Jan 2022

Reporter Chondrocyte Optimization Of Bioinks For Zonal 3d Bioprinting Of Cartilage, Kari Martyniak

Electronic Theses and Dissertations, 2020-2023

Osteoarthritis (OA) is the most common form of arthritis, often thought of as a disease of the elderly, but post traumatic OA predominantly impacts younger individuals. Articular cartilage is the tissue that coats the end of your bones in synovial joints. Since cartilage has limited healing capacity, defects, or injuries to it progressively erodes down to the subchondral bone. Unfortunately, current treatment options all have limitations, particularly for younger patients. Cartilage has a specific zonal architecture that is distinguished by the different cell morphologies and arrangements, biochemical composition, and mechanical properties. 3D bioprinting is a tissue engineering technique that involves …

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Prediction And Validation Of Residual Stresses In Additively Manufactured Metal Parts, Jose Mayi Rivas Jan 2022

Prediction And Validation Of Residual Stresses In Additively Manufactured Metal Parts, Jose Mayi Rivas

Electronic Theses and Dissertations, 2020-2023

Selective Laser Melted (SLM) Additively Manufactured (AM) metal parts are of special interest to many industries because their designs can be made arbitrarily complex while still maintaining bulk type mechanical properties. However, the large thermal gradients inherent to the SLM process generate residual stresses (RS) and distortions that are detrimental to the fit, functionality and integrity of parts. Predicting the state of stresses in as-built 3D printed parts is a difficult problem that currently has only been approached with the use of transient thermomechanical Finite Element Models (FEMs). The nonlinearities associated with AM processes are difficult to capture in these …

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Investigating The Effect Of Cmas Infiltration On Residual Stress Of High Temperature Ceramic Coatings For Turbine Engines Using 3d Confocal Raman Spectroscopy, Zachary Stein Jan 2022

Investigating The Effect Of Cmas Infiltration On Residual Stress Of High Temperature Ceramic Coatings For Turbine Engines Using 3d Confocal Raman Spectroscopy, Zachary Stein

Electronic Theses and Dissertations, 2020-2023

Calcium-magnesium-aluminosilicates (CMAS), such as sand or volcanic ash, are ingested by aircraft jet engines during operation. CMAS then becomes molten while traveling through the combustor of the engine before depositing onto turbine blades within the turbine section of the engine. The molten CMAS melt infiltrates and interacts with the high temperature ceramic coated turbine blades. This infiltration increases coating stiffness and promotes coating phase destabilization, encouraging micro-crack formation and increasing the risk of spallation. Thermomechanical effects from CMAS infiltration were mapped over time with confocal Raman spectroscopy. The residual stresses within infiltrated 7YSZ EB-PVD coatings were captured with microscale resolution. …

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Examining The Relationship Between Six Sigma Failures And The Utilization Of Cost Engineering Approaches, Dennis Tribby Jan 2022

Examining The Relationship Between Six Sigma Failures And The Utilization Of Cost Engineering Approaches, Dennis Tribby

Electronic Theses and Dissertations, 2020-2023

The purpose of the quantitative non-experimental research study is to analyze the relationship between the impact of using cost engineering approaches and the success rate of Six Sigma projects in the manufacturing industry. This study focuses on the relationship between Six Sigma project failures and whether skilled cost engineering professionals, methods or a cost management system was used to ensure that accurate cost data was utilized during the design project's lifecycle. Many companies using Six Sigma and related methodologies for product design have implemented with great success yet there are studies indicating that only 13% of firms reported achieving their …

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Testing The Influence Of Water Depth In Design Of Created Oyster Reef For Living Shoreline Applications, Peter Vien Jan 2022

Testing The Influence Of Water Depth In Design Of Created Oyster Reef For Living Shoreline Applications, Peter Vien

Electronic Theses and Dissertations, 2020-2023

Living shoreline stabilization has become a popular practice in shoreline restoration and bank protection; however, there are still many uncertainties regarding effective site design using living materials. For example, natural wave-breaks may be formed of created reefs, but the optimum water depth for hydrodynamic influence may differ from the preferred depth to ensure organism recruitment. The objective of this research is to understand how water depth relative to the crest of submerged artificial oyster reef structures influences nearshore hydrodynamic processes and sediment transport or retention in nearshore areas. A field study, sited in a microtidal estuary on the Atlantic coast …

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A Deep Learning Approach For Spatiotemporal-Data-Driven Traffic State Estimation, Amr Hatem Ragaa Abdelraouf Jan 2022

A Deep Learning Approach For Spatiotemporal-Data-Driven Traffic State Estimation, Amr Hatem Ragaa Abdelraouf

Electronic Theses and Dissertations, 2020-2023

The past decade witnessed rapid developments in traffic data sensing technologies in the form of roadside detector hardware, vehicle on-board units, and pedestrian wearable devices. The growing magnitude and complexity of the available traffic data has fueled the demand for data-driven models that can handle large scale inputs. In the recent past, deep-learning-powered algorithms have become the state-of-the-art for various data-driven applications. In this research, three applications of deep learning algorithms for traffic state estimation were investigated. Firstly, network-wide traffic parameters estimation was explored. An attention-based multi-encoder-decoder (Att-MED) neural network architecture was proposed and trained to predict freeway traffic speed …

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A Social Ecological Approach Towards Empowering Foster Youth To Be Safer Online, Karla Badillo-Urquiola Jan 2022

A Social Ecological Approach Towards Empowering Foster Youth To Be Safer Online, Karla Badillo-Urquiola

Electronic Theses and Dissertations, 2020-2023

Teens in foster care are some of the most vulnerable youth to encounter serious offline risks, such as sex trafficking. Research shows that children who are vulnerable offline are more likely to be vulnerable online. Therefore, it is important to understand how the internet plays a role in how foster youth are exposed to these risks, so that we may develop effective interventions that empower foster youth against becoming victims of these online risks. A comprehensive review of the literature (Chapter 2) emphasized the unique sets of characteristics and challenges of foster youth that create substantial nuance and require a …

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Studying The Electrostatic Effects On The Dynamics Of Charged Lunar Dust Via Discrete Element Method, Hao Wang Jan 2022

Studying The Electrostatic Effects On The Dynamics Of Charged Lunar Dust Via Discrete Element Method, Hao Wang

Electronic Theses and Dissertations, 2020-2023

Dust problems raise significant concerns in planetary surface exploration. The unusual behavior of the dust particles that surround the vehicle after engine cutoff has the potential to have more of an influence on surface systems than the high velocity lunar rocket plume ejecta in the landing process. A prevailing hypothesis attributes the levitation and transport of dust particles on the surface of airless bodies to the electrostatic effects and electric field. However, there is no accurate model considering the inter-particle electrostatic interactions, especially when the particles are charged by plume. This dissertation aims to understand the behavior of charged lunar …

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Application Of Biologically Activate Carbon For Treatment Of Sulfide-Laden Groundwater, Jessica Cormier Jan 2022

Application Of Biologically Activate Carbon For Treatment Of Sulfide-Laden Groundwater, Jessica Cormier

Electronic Theses and Dissertations, 2020-2023

Small-system water purveyors must overcome many challenges to provide an adequate and safe water supply to its consuming public. This dissertation reports on research related to the application of biologically activated carbon (BAC) media filters for the treatment of well water to remove disinfection by-product (DBP) precursor matter, measured as dissolved organic carbon (DOC), at two treatment plants serving a small community water system. Four research questions were investigated individually in discrete, yet interconnected studies at two water treatment facilities processing groundwater that contained hydrogen-sulfide (~1.2 mg/L) and dissolved organic carbon (~2.0 mg/L). The first study revealed that BAC filters …

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Integrated Electro-Optic, Microwave, And Nonlinear Photonic Devices On Thin-Film Lithium Niobate, Milad Gholipour Vazimali Jan 2022

Integrated Electro-Optic, Microwave, And Nonlinear Photonic Devices On Thin-Film Lithium Niobate, Milad Gholipour Vazimali

Electronic Theses and Dissertations, 2020-2023

Lithium niobate has numerous extraordinary features that make it useful for a wide range of applications, particularly in optics. The material's strong electro-optic effect and second-order nonlinearities are two prime examples with applications in optical modulation and wavelength conversion, respectively. The thin-film lithium niobate platform has revitalized the conventional applications of lithium niobate during the last decade. The platform is now one of the most actively investigated subdisciplines in integrated photonics. The waveguides on this innovative platform are high index contrast, resulting in a size reduction of more than 20 times and a bending radius decrease of about two orders …

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