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Articles 31 - 60 of 68
Full-Text Articles in Engineering
Near-Shore Sediment Transport Under Cnoidal Waves Using Particle Image Velocimetry, Jenna Rose Katrina
Near-Shore Sediment Transport Under Cnoidal Waves Using Particle Image Velocimetry, Jenna Rose Katrina
Theses and Dissertations
With future trends showing a higher percentage of the human population living along the coast, coastal resilience is a significant topic of concern for many researchers. The purpose of this research was to analyze near-shore sediment transport under different wave parameters using the technique of Particle Image Velocimetry (PIV) and laboratory studies for linear and nonlinear cnoidal waves. At the deeper extent of the nearshore profile, waves will tend to be linear, having an Ursell number less than 40, with little or no net sediment transport due to orbital velocities. The velocities are the same under the crest and trough …
The Effects Of Ultraviolet Radiation On Aircraft Crewmember Health, Erin Johnston
The Effects Of Ultraviolet Radiation On Aircraft Crewmember Health, Erin Johnston
Theses and Dissertations
Ultraviolet (UV) radiation and its effects on crewmember health will be evaluated by examining the variables that impact the intensity of UV radiation and the health concerns associated with this exposure. The purpose of this study was to (a) identify how Ultraviolet A (UVA) exposure is different in an aircraft cockpit when compared to the exposure at sea-level and (b) expose the adverse health impacts associated with an increased exposure of UVA radiation. This was accomplished through an examination of UV radiation and the variables that impact its effectiveness. After this analysis, the adverse health impacts experienced from UV radiation …
Reduced Sample Minimum Strength Estimates For Novel Material Systems: Effects On Confidence And Structural Risk, Andrew Carl Ollikainen
Reduced Sample Minimum Strength Estimates For Novel Material Systems: Effects On Confidence And Structural Risk, Andrew Carl Ollikainen
Theses and Dissertations
There are ongoing efforts to standardize the materials, methods and process controls used in additive manufacturing. To support the broader use of additive manufacturing (AM) in the aerospace industry, the statistics working group of the Composite Materials Handbook (CMH-17) is evaluating whether its current methods of calculating minimum strength values are suitable for these new materials. The work presented in this dissertation investigates methods for determining minimum strength estimates in a way that will benefit application of AM materials in engineering practice. The greatest challenge in conducting such an assessment is accounting for the many variables in material, processing, and …
The Effects Of Noise On Parametrically Excited Systems With Nonlinear Damping, Donghao Li
The Effects Of Noise On Parametrically Excited Systems With Nonlinear Damping, Donghao Li
Theses and Dissertations
Parametric oscillators are a class of resonating systems in which a parameter, such as stiffness in a mechanical system or capacitance in an electrical system, is periodically modulated in order to alter the system response in a desired manner. A resonance effect occurs when the pump frequency is near twice of resonant frequency. Such systems are said to be “parametrically pumped,” and this pump can, above a certain amplitude threshold, destabilize the system in the absence of nonlinearities. Parametric resonance is widely observed in nature and has been employed in a large variety of engineered systems, most notably in micro-electro-mechanical …
Design And Analysis Of A Pipe And Pump System Constructed To Connect Port Canaveral To The Banana River, Nicole Ann Mcclain
Design And Analysis Of A Pipe And Pump System Constructed To Connect Port Canaveral To The Banana River, Nicole Ann Mcclain
Theses and Dissertations
The Indian River Lagoon (IRL) has hosted an extensive array of plants and animals throughout its lifetime, having one of the greatest species’ diversity of all North American estuaries. In addition to the variety of marine wildlife that is supported by the IRL, the system is also a recreational and economic resource for the counties bordering it. The biological integrity of the IRL, however, has shown evidence of decline in the last few decades, due to impaired water quality caused by pollution and disruptions to natural circulation patterns. If far-reaching changes are made to repair the water quality of the …
Development And Validation Of The Itf Scale: An Investigation Of Airline Passengers’ Intention To Fly During A Global Disruption, Guangda Liang
Development And Validation Of The Itf Scale: An Investigation Of Airline Passengers’ Intention To Fly During A Global Disruption, Guangda Liang
Theses and Dissertations
The purpose of the current study was to develop and validate the ITF scale that measured airline passengers’ intention to fly during a global disruption. Based on the review of the literature, the researcher identified several dimensions, and each dimension was measured by question items. The target population of the current study was airline passengers in the United States who were at least 18 years old. A sample was collected using the convenience sampling. The questionnaire was distributed online. The ITF scale was validated using data collected from the online questionnaire. A factor analysis was performed. The results of the …
Scaling Flight Test Data Between A Scaled Aircraft And A Cessna 172 For Use In Trajectory Energy Model Validation, Cody William Nettleton
Scaling Flight Test Data Between A Scaled Aircraft And A Cessna 172 For Use In Trajectory Energy Model Validation, Cody William Nettleton
Theses and Dissertations
Currently in the general aviation sector, a new type of aircraft is rising to prominence. It is known as Urban Air Mobility (UAM) and takes many shapes and sizes. The goal of UAM is to produce aircraft that can be used to travel into and out of the city in an efficient manner through the sky. This may cut down on many people’s commutes and lower the amount of ground traffic in cities. One core component of UAM research is to determine the fuel consumption during phases of flight such as conventional takeoff and landing, as well as cruise travel …
Stress Analysis Based On Ecg And Eeg, Eyad Talal Attar
Stress Analysis Based On Ecg And Eeg, Eyad Talal Attar
Theses and Dissertations
Stress is a significant risk factor for various diseases such as hypertension, heart attack, stroke, and even sudden death. In many studies, stress is linked to decision making, performance, and learning. The heart rate variability (HRV) can be measured from the Electrocardiogram (ECG) and is defined as the variation of the interval between two consecutive heartbeats (heart rate). Heart rate variability is also an indicator of the balance between the sympathetic and parasympathetic branches of the autonomic nervous system. HRV refers to variations of heart rate in a certain amount of time. Heart rate variability (HRV) is a relatively new …
Follow-On Student Pilot Performance Differences Based On Private Pilot Training In A Residential Collegiate Program Or Non-Collegiate Program, Anton William Cihak Ii
Follow-On Student Pilot Performance Differences Based On Private Pilot Training In A Residential Collegiate Program Or Non-Collegiate Program, Anton William Cihak Ii
Theses and Dissertations
The purpose of this study was two-fold: to examine the difference between students who had obtained a private pilot certificate from a residential collegiate flight program and students who had obtained a private pilot certificate from a non-collegiate flight program in a) pilot performance and b) time spent completing commercial and instrument flight courses. A supplemental analysis of the differences in the number of lessons required to complete commercial and instrument flight training was also conducted as a further comparison between pilot groups. This study utilized an ex post facto, effects-based methodology and design with data derived from a university …
Endothelial Response In 2d And 3d To Doses Of Photosensitive Carbon Monoxide Releasing Molecules With Improved Activation, Nicholas Duc Huynh
Endothelial Response In 2d And 3d To Doses Of Photosensitive Carbon Monoxide Releasing Molecules With Improved Activation, Nicholas Duc Huynh
Theses and Dissertations
Cardiovascular disease (CVD) is the leading cause of death worldwide in large part due to atherosclerotic obstruction of blood vessels. Limitations with current treatment approaches include restenosis in stenting and viable donor-tissue for bypass grafts, and this has motivated research combining the fields of drug delivery and tissue engineering for alternative approaches. The use of carbon monoxide as a potential therapeutic agent in the treatment of CVD has shown potential impacts on vasodilation and anti-inflammation. The goal of this study was to develop a system to elucidate the response of endothelial cells post-exposure to different concentrations of carbon monoxide releasing …
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 …
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 (~ …
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 …
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 …
Multi-Degree Of Freedom Position And Attitude Control Of Rings Dipoles Using Electromagnetic Forces And Torques, David Andres Alvarez
Multi-Degree Of Freedom Position And Attitude Control Of Rings Dipoles Using Electromagnetic Forces And Torques, David Andres Alvarez
Theses and Dissertations
Satellite formation flight (SFF) is likely to transform and advance the scope of space missions in the near future. Some considerable benefits of SFF to a mission include robustness, adaptability, and potential cost savings. However, satellite formations face a fuel expenditure issue: the more spacecraft there are to control, the more fuel will be expended on alignment and maneuvering. A solution to this problem is Electromagnetic Formation Flight (EMFF), which is the application of conductive coils in producing electromagnetic fields that can interact with the fields of other coils in a formation to exchange forces and torques. With three orthogonal …
Stability And Control Flight Testing Of The Dassault Falcon 10/100, Andres Mauricio Alarcon Vega
Stability And Control Flight Testing Of The Dassault Falcon 10/100, Andres Mauricio Alarcon Vega
Theses and Dissertations
The Falcon 10/100 is a transport category aircraft developed by Dassault Aviation in 1971. Production of the aircraft ceased in 1989, but it remains available on the secondhand market. Certification for these types of aircraft follow FAR Part 25 of the code of federal regulations. Aircraft stability and control flying qualities are dependent on the mission profile and intended use case of the aircraft. External factors, such as turbulence, are relevant for transport category aircraft because poor stability could affect the flying characteristics and result in an unpleasant ride. On the other hand, in a trimmed condition, an aircraft with …
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 …
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 …
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 …
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 …
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 …
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 …
Performance Profile Testing Of The Dassault Falcon 10/100, Thomas Henry Bolek Roman
Performance Profile Testing Of The Dassault Falcon 10/100, Thomas Henry Bolek Roman
Theses and Dissertations
The objective of the performance profile and flight testing comparison is to practice flight test theory on a turbofan-powered aircraft, compare results to Dassault published parameters, and give insight on how this may become a module for the flight test engineering program at Florida Tech. The performance experiments conducted were takeoff performance, level acceleration, level flight performance, stall speed, and roll performance. Takeoff distance was observed using the data from the Stratus ADSB receiver, which gave GPS coordinates; additionally, takeoff distance was measured via Google Earth from the start and the takeoff location observed by the co-pilot. The takeoff field …
Analytical Airflow Solution Of A Helicopter Engine Bay And Novel Bay Cooling Cowling Design, Daniel Evan Yastishock
Analytical Airflow Solution Of A Helicopter Engine Bay And Novel Bay Cooling Cowling Design, Daniel Evan Yastishock
Theses and Dissertations
The objective of this thesis is to develop an analytical-numerical solution for the engine bay cooling airflow in a representative helicopter based on the Augusta-Westland 101, and evaluate the performance of a novel rotating scoop cowling on the airflow. The methodology was created in PythonTM. Results obtained via the analytical method were compared against a CFD model constructed with Ansys® at a hover, 50 fps forward flight, and 250 feet per second forward flight using a k−ε turbulence model. Performance of the rotating scoop was compared to that of a conventional inlet orifice and fixed scoop in a similar airspeed …
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 …
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 …
Bioink Optimization And Effects Of Microgravity On 3d Bioprinted Cell Laden Constructs, Likitha Somasekhar
Bioink Optimization And Effects Of Microgravity On 3d Bioprinted Cell Laden Constructs, Likitha Somasekhar
Theses and Dissertations
Bioengineered 3D tissue constructs have gained attention as in vitro tools for the study of cell-cell and cell-matrix interactions and are being explored for potential use as experimental models for mimicking human tissues. One of the main problems in tissue engineering is the necessity to vascularize complex engineered tissues and sacrificial printing has been recognized as a possible solution to vascularization of the bioprinted tissues. Research studies have demonstrated that exposure to microgravity in space induces adaptive alterations in vascular structure and function. Changes in the morphology and gene expression is observed when endothelial cells are exposed to microgravity and …