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Articles 2881 - 2910 of 11509
Full-Text Articles in Engineering
Testing And Performance Analysis Of A New Wireless Sensors Network (Wsn) System For Hurricane Monitoring, Jianing Wang
Testing And Performance Analysis Of A New Wireless Sensors Network (Wsn) System For Hurricane Monitoring, Jianing Wang
Theses and Dissertations
Researchers at the Florida Institute of Technology (FIT) have developed the wireless sensor network system for the field measurement of hurricane wind and pressure on residential structures. A new version of the system is developed using the latest state-of-the-art technologies which performance is tested during the passing of hurricane Isaias (2020) and the Wall of Wind (WOW) at Florida International University (FIU). The old version system sensors were applied during hurricane Dorian (2019). For the three events, 25 pressure sensors and one anemometer were placed on the roof of a single-story house. Hurricane Dorian data was collected for 72 hours …
Hydrogen/Diesel Co-Combustion In Compression Ignition Engines Through Hydrogen Ingestion And Direct Hydrogen Injection, Helge Hening Von Helldorff-Garn
Hydrogen/Diesel Co-Combustion In Compression Ignition Engines Through Hydrogen Ingestion And Direct Hydrogen Injection, Helge Hening Von Helldorff-Garn
Theses and Dissertations
This dissertation develops, implements, and validates the computational tools necessary for the computational simulation of hydrogen-enhanced Diesel combustion for premixed hydrogen charges ingested into the intake air and for direct injected hydrogen pilot charges into the cylinder. This includes a dual-fuel mechanism, a Lagrangian gaseous injection scheme, an improved spray particle breakup model, an advanced chemical kinetic reaction solver, as well as a complex n-heptane chemical kinetic reaction mechanism consisting of 35 species and 119 reversible reactions capable of describing both premixed and mixing controlled hydrogen/Diesel co-combustion at various fuel concentrations. The results showed that low levels of either hydrogen …
Extraction Of Pendulum Model Parameters From Steady-State Slosh Data With Adaptive Gradient Descending Optimization Method For Spacecraft Propellant Tanks, Tengjie Gao
Theses and Dissertations
This thesis proposes a new experimental approach to extract pendulum model parameters from spacecraft propellant tank slosh data. The novelty of the approach is in the utilization of steady-state triaxial force measurements at the support points of the tank under sinusoidal excitation, which enables repeatable and accurate determination of pendulum model parameters in contrast to the single-axis force sensing and multiple repetitions averaging techniques associated with the more common decay approach. This approach may be used for tanks with free slosh; however, this thesis considers a diagram tank with three different diaphragm configurations under translational oscillatory lateral excitation. With the …
Behavior Of Selective Oxygen Functional Groups Upon Hydrothermal Carbonization And Pyrolysis Of Biomass And Their Roles On Selective Applications, Nepu Saha
Theses and Dissertations
Hydrothermal carbonization (HTC) is a thermochemical process where biomass is treated in water under high temperature and corresponding vapor pressure. During HTC, biomass undergoes a series of reactions including hydrolysis, decarboxylation, dehydration, aromatization, and polymerization. As a result, a solid product is produced from biomass after HTC process, which is widely known as hydrochar. Depending on the HTC process conditions, a wide-variety of oxygen-containing groups formed on hydrochar surfaces. Many of these groups could play critical roles in applications such as adsorption, and energy and gas storage, etc. However, not all functional groups are exposed on the surface due to …
A Comparative Study To Assess The Osteogenic Potential Of Competing Bioceramics For Bone Tissue Engineering, Nashaita Patrawalla
A Comparative Study To Assess The Osteogenic Potential Of Competing Bioceramics For Bone Tissue Engineering, Nashaita Patrawalla
Theses and Dissertations
Biomimetic composite scaffolds comprising of bioactive ceramic-based materials incorporated within a polymeric framework have shown considerable promise for use in bone tissue engineering (BTE) applications. Although bioceramics have shown immense promise for use in BTE, few studies have performed a head-to-head comparison of the osteogenic properties of the most promising bioceramic materials. The goal of this study was to compare three different bioceramics – Bioglass 45S5 (BG), Laponite XLG (LAP), and β-Tricalcium Phosphate (TCP) – on the physical properties (i.e., swelling, stability, compressive modulus, bone bioactivity) of methacrylated collagen (CMA) hydrogels and osteogenic differentiation of human MSCs (hMSCs) encapsulated within …
Validation Of Arterial Distensibility Neural Network Model With Clinical Data, Cassondra Michelle Petersen
Validation Of Arterial Distensibility Neural Network Model With Clinical Data, Cassondra Michelle Petersen
Theses and Dissertations
Cardiovascular diseases continue to plague the world as the number one killer of adults each year. As cardiovascular diseases can start with seemingly no symptoms, heart disease has been coined as the silent killer. With the ongoing COVID-19 global pandemic, the need for advances in cardiovascular advances has become even more prevalent as this virus is known to cause more severe damage to those who have underlying cardiovascular problems. These two reasons show the dire clinical need for researchers to continue to use novel techniques such as neural networks to find new approaches for helping physicians non-invasively and quickly add …
Cardiovascular Intelligence: Novel Quantitative Cardiology, Deep Learning And Machine Learning Models To Predict Clinical Outcomes, Vignesh Balasubramanian
Cardiovascular Intelligence: Novel Quantitative Cardiology, Deep Learning And Machine Learning Models To Predict Clinical Outcomes, Vignesh Balasubramanian
Theses and Dissertations
Arterial compliance has been recognized as a critical parameter in governing pulsatile flow dynamics. It has traditionally been assumed constant throughout the cardiac cycle. Its computation has been based either on the classic Windkessel model in diastole or the stroke volume over pulse pressure method in systole. We proposed a novel compliance-pressure loop (CPP loop) approach to quantify arterial compliance and compare it to existing linear and nonlinear methods. This was followed by an analysis of increased pulse wave reflections in hypertension due to impedance mismatching and how the effective energy transmission to the vasculature is compromised. Their quantification in …
Over The Ocean Rf Propagation Modeling And System Design For Wireless Broadband Systems, Rayan Enaya
Over The Ocean Rf Propagation Modeling And System Design For Wireless Broadband Systems, Rayan Enaya
Theses and Dissertations
The research presented in this document considers the development of a terrestrial wireless communication system for providing connectivity to vessels within coastal waters. The system operates in the 2.4GHz ISM band and can provide throughputs that are on the order of 1-20Mbps. Several important aspects of the system design are considered. First, the propagation path loss in the2.4GHz band over the coastal water is characterized. The characterization is performed through an extensive measurement campaign. A practical propagation model is developed. Second, since 2.4GHz is an unlicensed spectrum, it hosts many other wireless systems. These systems create substantial noise in the …
Impact Of Antecedent Wetness And Rainfall Spatial Variability On Design Floods, Rachael Nicole Mcmahon
Impact Of Antecedent Wetness And Rainfall Spatial Variability On Design Floods, Rachael Nicole Mcmahon
Theses and Dissertations
In the absence of long hydrologic records, water engineering design application rely primarily on the concept of design storms and subsequently design floods. However, despite the long-lasting use of these approaches there are several aspects that merit careful consideration and possibly revision. Representation of spatial variability of rainfall extremes in design storms has relied primarily on the use of area reduction factors that while useful, they do not represent realistic patterns of flood inducing storms. Furthermore, the impact of antecedent wetness on the transformation of design storms to design floods is often neglected. In this work we carry out a …
Analysis And Uncertainty Reduction Through Data Augmentation In Hurricane Risk Modeling In The State Of Florida, Daphne Raquel Otarola Farah
Analysis And Uncertainty Reduction Through Data Augmentation In Hurricane Risk Modeling In The State Of Florida, Daphne Raquel Otarola Farah
Theses and Dissertations
The Florida Public Hurricane Loss Model (FPHLM) and the Florida Public Flood Loss Model (FPFLM) project insurance losses due to hurricane events in the State of Florida from hurricane induced wind, rain, and flood. This hurricane catastrophe model estimates annual average loss costs, as well as mean loss levels for scenario events, for personal and commercial residential portfolios, including building structure, content, appurtenant, and additional living expenses. Insurance companies use these hurricane risk models in Florida, and in particular the Florida Office of Insurance Regulation (OIR) mandates that the FPHLM be used for the stress test, that verifies the actuarial …
Modeling And Energy Simulation Of A Zero Energy Building: A Case Study For Florida, Mariana Migliori Favaretto
Modeling And Energy Simulation Of A Zero Energy Building: A Case Study For Florida, Mariana Migliori Favaretto
Theses and Dissertations
The study of energy consumption in buildings is an important area of research given the large share of building sector in the worldwide energy usage. The energy consumption of buildings has a high impact on carbon emissions, a greenhouse gas which has proved to play a major role in global warming. In the last decades, global warming has become an increasing concern and worldwide high energy demand have awaken a pressing quest towards improving building energy efficiency. Reducing buildings’ energy usage by implementing energy efficiency measures is one way towards a sustainable future for any country in the world. This …
Inverse Methods For Near-Real Time Estimation Of Surface Heat Flux In Thermal Protection Systems For Space Vehicles, Obinna Oluchukwu Ugochukwu Uyanna
Inverse Methods For Near-Real Time Estimation Of Surface Heat Flux In Thermal Protection Systems For Space Vehicles, Obinna Oluchukwu Ugochukwu Uyanna
Theses and Dissertations
With the increased goal of manned explorations to outer space, safety during the atmospheric entry/reentry process is paramount as the incident heat fluxes on the surface of vehicle can reach critical values. Thermal Protection Systems (TPS) are therefore essential components in space vehicles as they ensure the safety and protection of the payload and cargo. In order to ensure improved active control capabilities and prolonged used of the vehicle, TPS surface conditions need to be known and determined. Since direct measurement of the surface heat flux using sensors is not feasible, one alternative involves the use of temperature sensors located …
Flagellation Testing Of Composite Finger Skirts For Surface Effect Ship (Ses) Application, Natalie Marie Holliday
Flagellation Testing Of Composite Finger Skirts For Surface Effect Ship (Ses) Application, Natalie Marie Holliday
Theses and Dissertations
The objective of this research is to create flagellation data for SES finger skirts. The SES design allows it to have a high tonnage with low draft, little drag, low wavemaking resistance, remarkable carrying capacity, and incredible propulsive efficiency. A SES is a sidehull hovercraft, with air cavity sealing components at the bow and stern. The fingers at the bow collectively make up an elastic, flexible full sealing skirt, dissipating oncoming waves and allowing for the vessel to be self-stabilizing. The problem with SES vessels is that the bow finger skirts wear significantly over a short period of time (~ …
The Effect Of Simulated Mangrove Forest Width On Shoreline Stabilization At Multiple Tidal Water Levels, James Edward Austin
The Effect Of Simulated Mangrove Forest Width On Shoreline Stabilization At Multiple Tidal Water Levels, James Edward Austin
Theses and Dissertations
Red mangrove (Rhizophora mangle) forests protect hundreds of miles of Florida’s shorelines from erosion and wave damage associated with severe storms and daily wave action. Shorelines are often protected from erosion with man-made structures such as seawalls, revetments, and breakwaters. However, these man-made structures disrupt natural ecosystems and cause scour and erosion in surrounding areas. The presence of mangroves not only prevents erosion but shelters marine life and filters water, promoting ecological health. Mangroves are now being implemented for wave energy reduction and shoreline stabilization, but there is little quantitative data about the precise sediment transport induced or prevented by …
Uplink Throughput Prediction And Device Geolocation In Cellular Communication System Using Machine Learning Methodology, Engin Eyceyurt
Uplink Throughput Prediction And Device Geolocation In Cellular Communication System Using Machine Learning Methodology, Engin Eyceyurt
Theses and Dissertations
Continuously increasing the number of interconnecting devices, cloud services, and social media usage require enormous amounts of mobile data. Due to the rapid increase in cellular data demand, accurate cellular data prediction has become more critical. The increase in the number of mobile subscribers raised the issue of whether users' location can be determined. The most important uses of geolocation technology are emergencies and security purposes. In addition to emergency and security affairs, geolocation technology can decrease cellular network maintenance costs. Mobile network systems have become highly complex with a large number of parameter and feature add-ons. Along with the …
Dynamic Route Optimization For Waste Collection In Smart City, Abdullah Suliman Alwabli
Dynamic Route Optimization For Waste Collection In Smart City, Abdullah Suliman Alwabli
Theses and Dissertations
Waste collection is a critical component of the municipal service to the community within urban set-ups. Increasing levels of waste generation present significant challenges in urban areas due to unprecedented population growth. Consequently, due to the accumulating amounts of waste, waste management has become a primary concern. Several problems also emanate from the current inadequate and inefficient waste management systems that rely on non-scientific techniques. This paper proposes using IoT-based smart bins to improve the waste management process by optimizing waste collection. Al-Awali District in the Saudi Arabian city of Mecca will be the main focus of this study, where …
An Investigation Of Runway Risks Using A Systems Approach, Mehnaz Hassan
An Investigation Of Runway Risks Using A Systems Approach, Mehnaz Hassan
Theses and Dissertations
The purpose of this study was to explore and determine if Causal Analysis Based on System Theory ( could divulge differing underlying causes in the Taxiway overflight incident of Air Canada Flight 759 at San Fran cisco International Airport, as compared to traditional investigation methods used by the National Transportation Safety Board ( Investigations tend to focus on trying to establish the probable cause of an accident or incident, and as a result, the systemic components tend to be overlooked which leads to the common underlying causes of the event left unsolved. Adopting a systems approach to assessing runway risks …
Exploring The Effects Of Communication Delays And Personality On Stress During Simulated Space Missions, Shayan Shirshekar
Exploring The Effects Of Communication Delays And Personality On Stress During Simulated Space Missions, Shayan Shirshekar
Theses and Dissertations
The purpose of this study was to examine the effects of communication delays and personality on stress levels during a simulated spaceflight mission. The study used an experimental, within-groups, repeated-measures design to explore these effects during a simulated Mars mission, specifically: (a) 1–3-second (s) (control) and (b) a 2-minute (min) one-way communication delay expected during the early transit phase of a Mars mission. The Big Five personality traits served as moderating variables and included extraversion, agreeableness, conscientiousness, neuroticism, and openness to experience. This study was developed and tested with participants analogous to an astronaut population: healthy individuals possessing or pursuing …
Five Degree-Of-Freedom Property Interpolation Of Arbitrary Grain Boundaries Via Voronoi Fundamental Zone Octonion Framework, Sterling Gregory Baird
Five Degree-Of-Freedom Property Interpolation Of Arbitrary Grain Boundaries Via Voronoi Fundamental Zone Octonion Framework, Sterling Gregory Baird
Theses and Dissertations
In this work we introduce the Voronoi fundamental zone octonion (VFZO) interpolation framework for grain boundary (GB) structure-property models and surrogates. The VFZO framework offers an advantage over other five degree-of-freedom (5DOF) based property interpolation methods because it is constructed as a point set in a Riemannian manifold. This means that directly computed Euclidean distances approximate the original octonion distance with significantly reduced computation runtime (∼7 CPU minutes vs. 153 CPU days for a 50000×50000 pairwise-distance matrix). This increased efficiency facilitates lower interpolation error through the use of significantly more input data. We demonstrate grain boundary energy (GBE) interpolation results …
Digital Signal Processing Algorithms Implemented On Graphics Processing Units And Software Development For Phased Array Receiver Systems, Mark William Ruzindana
Digital Signal Processing Algorithms Implemented On Graphics Processing Units And Software Development For Phased Array Receiver Systems, Mark William Ruzindana
Theses and Dissertations
Phased array receivers are a set of antenna elements that are capable of forming multiple simultaneous beams over a field of view. In radio astronomy, the study of deep space radio sources, a phased array feed (PAF) is placed at the focus of a large dish telescope that spatially samples the focal plane. PAFs provide an increase in the field of view as compared to the traditional single pixel horn feed, thereby increasing survey speed while maintaining low sensitivity. Phased arrays are also capable of radio frequency interference (RFI) mitigation which is useful in both radio astronomy and wireless communications …
Trajectory Generation And Tracking Control For Winged Electric Vertical Takeoff And Landing Aircraft, Jacob B. Willis
Trajectory Generation And Tracking Control For Winged Electric Vertical Takeoff And Landing Aircraft, Jacob B. Willis
Theses and Dissertations
The development of high-energy-density batteries, advanced sensor technologies, and advanced control algorithms for multirotor electric vertical takeoff and landing (eVTOL) unmanned aerial vehicles (UAVs) has led to interest in using these vehicles for a variety of applications including surveillance, package delivery, and even human transportation. In each of these cases, the ideal vehicle is one that can maneuver in congested spaces, but is efficient for traveling long distances. The combination of wings and vectored thrust make winged eVTOLs the obvious choice. However, these aircraft experience a much wider range of flight conditions that makes them challenging to model and control. …
Electrical Capacitance Measurements To Assess European Corn Borer Infestation In Maize, Mavrik D. Thomas
Electrical Capacitance Measurements To Assess European Corn Borer Infestation In Maize, Mavrik D. Thomas
Theses and Dissertations
The European Corn Borer (ECB), Ostrinia nubilalis, is an agricultural pest which bores small holes in the rind of maize stalks and then proceeds to consume the pith. Because most of the damage to the stalk is internal, it is difficult to quantify the damage to an individual stalk without time-consuming, manual examination. This work explored the hypothesis that internal damage could be detected and quantified using non-destructive, electromagnetic measurements. Laboratory experiments and numerical simulation studies predicted changes in capacitance of stalks due to hollow core ECB damage. A guarded probe device to measure electrical impedance from 500 Hz to …
Compiler-Assisted Software Fault Tolerance For Bare Metal And Rtos Applications On Embedded Platforms, Benjamin James
Compiler-Assisted Software Fault Tolerance For Bare Metal And Rtos Applications On Embedded Platforms, Benjamin James
Theses and Dissertations
In the presence of ionizing particles and other high-energy atomic sources, many electronic and computer systems fail. Single event upsets (SEUs) can be mitigated through hardware and/or software methods. Previous research at BYU has introduced COAST, a compiler-based tool that can automatically add software protection schemes to improve fault coverage of programs. This thesis will expand on the work already done with the COAST project by proving its effectiveness across multiple platforms and benchmarks. The ability to automatically add fault protection to arbitrary user programs will be very valuable for many application designers. The results presented herein show that mean …
Gravel Liquefaction Assessment With The Dynamic Penetration Test At Non-Liquefaction Sites In Valdez, Alaska And L'Aquila, Italy, Nicholas James Linton
Gravel Liquefaction Assessment With The Dynamic Penetration Test At Non-Liquefaction Sites In Valdez, Alaska And L'Aquila, Italy, Nicholas James Linton
Theses and Dissertations
The development of a reliable, and cost-effective in-situ method for characterizing the liquefaction potential of gravelly soils is a considerable challenge for engineers and researchers. The ability to accurately characterize the liquefaction potential of gravelly soils is an important consideration at port facilities and dams for example. The Dynamic Penetration Test (DPT) provides a reliable and cost-effective method for evaluating the liquefaction resistance of gravelly soils. Probabilistic liquefaction triggering curves based on DPT field data have been developed from data collected at 47 sites in China. However, using the DPT-based liquefaction curves for locations outside of the Chengdu plain in …
Combined Trajectory, Propulsion And Battery Mass Optimization For Solar-Regenerative High-Altitude Long-Endurance Aircraft, Nathaniel Spencer Gates
Combined Trajectory, Propulsion And Battery Mass Optimization For Solar-Regenerative High-Altitude Long-Endurance Aircraft, Nathaniel Spencer Gates
Theses and Dissertations
This thesis presents the work of two significant projects. In the first project, a suite of benchmark problems for grid energy management are presented which demonstrate several issues characteristic to the dynamic optimization of these systems. These benchmark problems include load following, cogeneration, tri-generation, and energy storage, and each one assumes perfect foresight of the entire time horizon. The Gekko Python package for dynamic optimization is introduced and two different solution methods are discussed and applied to solving these benchmarks. The simultaneous solve mode out-performs the sequential solve mode in each benchmark problem across a wide range of time horizons …
Improvements Of Atmospheric Deposition Sampling Procedures And Further Analysis Of Its Impact On Utah Lake, Seth Michael Barrus
Improvements Of Atmospheric Deposition Sampling Procedures And Further Analysis Of Its Impact On Utah Lake, Seth Michael Barrus
Theses and Dissertations
This study focused on Atmospheric Deposition (AD) loading on Utah Lake. Utah Lake is susceptible to Harmful Algal Blooms (HABs) because of its large surface area to volume ratio, proximity to Great Basin dust sources, and various wind patterns from close mountain ranges that blow AD towards the lake. In this study, we continued the collection and analysis of AD samples that started in 2017 and 2018, while reporting additional 2019 and 2020 data. We constructed a sampler on Utah Lake itself, which allowed us to better estimate how AD loads were distributed over the lake. An interpolation assumption was …
Optimization Of Solar-Coal Hybridization For Low Solar Augmentation, Aaron T. Bame
Optimization Of Solar-Coal Hybridization For Low Solar Augmentation, Aaron T. Bame
Theses and Dissertations
One approach to enabling a larger penetration of renewable sources of energy is the implementation of hybrid power plants. This work presents a process to determine the preliminary optimal configuration of a concentrating solar power-coal hybrid power plant with low solar augmentation, and is demonstrated on a coal power plant in Castle Dale, UT. A representative model is developed and validated against published data for a coal power plant of a different configuration than Hunter Unit 3. The simplifications within the representative model include combining multiple feedwater heaters, combining turbines that operate across the same boundary states, and the mass-average …
Fpga-Accelerated Digital Signal Processing For Uav Traffic Control Radar, Kacen Paul Moody
Fpga-Accelerated Digital Signal Processing For Uav Traffic Control Radar, Kacen Paul Moody
Theses and Dissertations
As an extension of previous work done by Luke Newmeyer in his master's thesis \cite{newmeyer2018efficient}, this report presents an improved signal processing chain for efficient, real-time processing of radar data for small-scale UAV traffic control systems. The HDL design described is for a 16-channel, 2-dimensional phased array feed processing chain and includes mean subtraction, windowing, FIR filtering, decimation, spectral estimation via FFT, cross-correlation, and averaging, as well as a significant amount of control and configuration logic. The design runs near the the max allowable memory bus frequency at 300MHz, and using AXI DMA engines can achieve throughput of 38.3 Gb/s …
Numerical Modeling Of The Fiber Deposition Flow In Extrusion-Based 3d Bioprinting, Dhanvanth Jaya Talluri
Numerical Modeling Of The Fiber Deposition Flow In Extrusion-Based 3d Bioprinting, Dhanvanth Jaya Talluri
Theses and Dissertations
Extrusion bioprinting involves the deposition of bioinks in a layer-wise fashion to build 3D structures that mimic natural living systems' behavior in tissue engineering. Hydrogels are the most common bioinks, in which their viscosity properties are dependent on the shear-rate, such as Non-Newtonian fluids. Numerical simulation of extrusion bioprinting may help study the flow properties of hydrogels and designing improved bioinks. In this thesis, the instability caused by the shear-thinning or -thickening parameter during extrusion is numerically compared with the theoretical estimations. The process of fiber deposition of hydrogels onto a substrate through the single and coaxial nozzle is done …
Improving Understanding Of Liquid Viscosity Through Experiments And Prediction, Jeremy W. Passey
Improving Understanding Of Liquid Viscosity Through Experiments And Prediction, Jeremy W. Passey
Theses and Dissertations
Liquid viscosity is an important thermophysical property in process design. While liquid viscosity has been studied for over a century, much has been left unexplored. The behavior of liquid viscosity between the melting point and normal boiling point are well established, but yet there is a lack of experimental data – with only 52% of the compounds in the 801 DIPPR database having experimental liquid viscosity data – and inadequate prediction methods. This project was able to measure liquid viscosity for 30 organic compounds to help fill in the gap in the 801 DIPPR database. The measured results also helped …