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Articles 1 - 30 of 129
Full-Text Articles in Engineering
Entropy Aided Rf-Dna Fingerprint Learning From Gabor-Based Images, Mohamed Alfatih Taha
Entropy Aided Rf-Dna Fingerprint Learning From Gabor-Based Images, Mohamed Alfatih Taha
Masters Theses and Doctoral Dissertations
The number of devices connected to the internet have been increasing and shape Internet of Things (IoT). The security of IoT is an issue due to the use of weak or no encryption. Specific Emitter Identification (SEI) was introduced to overcome this issue by introduce RF-DNA fingerprinting exploring the PHY layer features. Recently, The SEI performance improved by the usage of the signal’s Time Frequency (TF) representation and accelerated using the Deep learning (DL) Convolutional Neural Network (CNN). While the classification accuracy has been improved from using raw signals learning the amount of data generated is large and computationally expensive. …
The Effects Of Virtual Reality On Mental Health Software User Satisfaction And Retention, William Hooten
The Effects Of Virtual Reality On Mental Health Software User Satisfaction And Retention, William Hooten
Honors Theses
Mental health issues have become increasingly important in today's society. With that being said, researchers and consumers are looking for new ways to manage and treat mental health using new technologies in labs and the consumer space. This innovation has led to the presence of mobile self-help mental health applications, applications for peoples’ phones that are used to manage symptoms of mental health problems, such as depression and anxiety, track goals, meditate, and more. However, mobile mental health applications, and mobile applications in general, have a problem concerning user satisfaction and overall user retention – studies have shown that 95% …
Corrosion Assessment Of Biodegradable Metal Implants For Orthopedic Applications, Wendy B. Reynoso-Diaz
Corrosion Assessment Of Biodegradable Metal Implants For Orthopedic Applications, Wendy B. Reynoso-Diaz
Honors Theses
Magnesium alloys are the most promising materials to be used as biodegradable implants mainly due to their superior biocompatibility and lower specific density compared to other biodegradable metals (i.e., zinc and iron-based alloys). This study is investigating the effect of two different manufacturing methods and purity levels on the corrosion rates of a novel Mg-Zn-Ca-Mn-based alloy. Experimental in vitro corrosion tests were conducted on the biocompatible Mg-Zn-Ca-Mn-based alloy fabricated using conventional casting and hot rolling with low and high purity levels. The experimental research conducted, assessed the corrosion rates of the following Mg-1.2Zn-0.5Ca-0.5Mn-based alloys: Hot Rolled High Purity, As-Cast High …
Incorporating In Situ Measurements Of Energy Into A Designed Method Of Detection Of Radiation Induced Degradation In Embedded Systems, Delwyn Sam
Honors Theses
An embedded system, or a system-on-chip (SOC), is a miniaturized computer that combines hardware and software to accomplish a certain purpose. Embedded systems are used in various applications from household appliances to the automobile industry. Additionally, SOCs are used in space environments where the surroundings consist of radiation and extreme temperatures. In these harsh conditions, embedded systems must operate properly through the effects of radiation such as total ionizing dose (TID). Because embedded systems are filled with various components and modules, and since the internal signals of the system are often inaccessible, methods to locate which specific parts of the …
Multistage Modeling Of Fatigue Of Ti-6al-4v Fabricated By Different Additive Manufacturing Techniques, Lionardo Lado, Saeed Ataollahi, Mohammad J. Mahtabi
Multistage Modeling Of Fatigue Of Ti-6al-4v Fabricated By Different Additive Manufacturing Techniques, Lionardo Lado, Saeed Ataollahi, Mohammad J. Mahtabi
Honors Theses
Thanks to its high strength-to-weight ratio and corrosion resistance, Ti-6Al-4V has gained a lot of attention in additive manufacturing (AM) of complex parts with aerospace and medical applications. The realistic loading condition in these applications is mostly cyclic. However, the main challenge with AM of this alloy - and in general AM of metallic parts - is fatigue resistance and durability of the part, which has been reported to be much lower than the conventional materials. In this study, fatigue life performance of three additive manufacturing methods was compared using the Multistage Fatigue model (MSF). MSF model predicts the fatigue …
Gasification Based Waste Tire Integrated Energy Conversion Systems, Karah Powell
Gasification Based Waste Tire Integrated Energy Conversion Systems, Karah Powell
Honors Theses
The objective of this study was to evaluate the operating parameters impacts on the performance of a gasification-based waste tire integrated energy conversion system. In this system, the waste tires are put into a downdraft gasifier that is providing fuel for a solid oxide fuel cell (SOFC). The system is evaluated by the syngas production, power generation, and overall efficiency under various operating conditions. A hybrid 1-D model was adopted to perform a parametric study of the tire gasification and calculations were done to estimate the integrated system power generation and overall efficiency using MATLAB. Three parameters were studied: the …
Global Privacy Concerns Of Facial Recognition Big Data, Myranda Westbrook
Global Privacy Concerns Of Facial Recognition Big Data, Myranda Westbrook
Honors Theses
Facial recognition technology is a system of automatic acknowledgement that recognizes individuals by categorizing specific features of their facial structure to link the scanned information to stored data. Within the past few decades facial recognition technology has been implemented on a large scale to increase the security measures needed to access personal information. This has been specifically used in surveillance systems, social media platforms, and mobile device access control. The extensive use of facial recognition systems has created challenges as it relates to biometric information control and privacy concerns. This concern raises the cost and benefit analysis of an individual’s …
Predictive Modeling Of Iphone 7 Charge Rates Using Least Squares Curve Fitting, Grace Cahill
Predictive Modeling Of Iphone 7 Charge Rates Using Least Squares Curve Fitting, Grace Cahill
Honors Theses
In a time where individuals depend on their cell phones, the need for a long lasting and quick charging battery life is imperative. As information regarding how long a battery can remained charged is highly advertised, there is no information regarding how long it would take for a dead phone battery to completely charge. This study determined the amount of time it will take an iPhone 7 to charge from 0% to 100% using the standard charging cable under four different charging conditions. The charge percentage was recorded every two minutes until it was fully charged with this process being …
Helios And Tenasi Results For The Workshop For Integrated Propeller Prediction, Aaron Crawford
Helios And Tenasi Results For The Workshop For Integrated Propeller Prediction, Aaron Crawford
Honors Theses
Beginning in 2018, the AIAA began the workshop for integrated propeller prediction. This effort was intended to bolster the CFD prediction capabilities of the aerospace community due to a resurgent interest in propeller driven vehicles for electric applications. The test bed for this workshop is the NASA X-57, a model of which was experimentally tested in the Lockheed Martin Low Speed Wind Tunnel in January 2019. Using the 3D scanned geometry provided by the workshop a mesh was created and all priority one simulations were performed using two flow solvers. The flow solvers used were Helios, developed by the ADD …
Melamine-Derived Graphene Foam As A Thermal Additive For Water Harvesting Applications, Emily Chase
Melamine-Derived Graphene Foam As A Thermal Additive For Water Harvesting Applications, Emily Chase
Honors Theses
This project proposes the use of a novel melamine-derived graphene foam formed by high temperature pyrolysis under inert conditions for use as a thermal additive to absorbent crystals. The high thermal conductivity of graphene foam makes it an ideal candidate for use as a cheap, flexible, and light-weight alternative to previously used copper foam and metal organic frameworks. Following surface functionalization, graphene foam may be saturated with hydrophilic absorbent crystals. The primary objectives of this research are to optimize the synthesis process of such a graphene foam to obtain the highest purity product while maintaining foam flexibility and to study …
Synthesizing And Modeling The Optical Properties Of Silica Aerogel, Hannah Margavio
Synthesizing And Modeling The Optical Properties Of Silica Aerogel, Hannah Margavio
Honors Theses
Silica aerogel has attracted the attention of researchers for decades for its applications in insulation materials, storage, and solar-thermal devices. The appeal surrounding silica aerogel is attributed to its unique combination of physical and chemical properties. Silica aerogel is a highly porous, optically transparent nano-polymer with a low thermal conductivity. Additionally, the material boasts a super-low density, high specific surface area, and low dielectric constant. The following report proposes a viable method of synthesizing polyvinylpolymethylsilane (PVPMS) aerogel as well as a model for determining the optical performance of TMOS aerogel by determining its radiative properties. First, the report will explore …
Augmented Reality In A Dynamic Drone Based Environment, Christopher Davis
Augmented Reality In A Dynamic Drone Based Environment, Christopher Davis
Honors Theses
Augmented Reality (AR) and Unmanned Ariel Vehicles (UAVs) are fast advancing technologies, and this research seeks to combine them to offer an effective, user friendly approach for monitoring infrastructure. Drones provide a means to easily access otherwise difficult to reach locations and visualize useful information with Augmented Reality. A UAV employs a wide-angle view and, when paired with AR, this will enable the user to better complete their task by effortlessly providing the critical information they need in the most intuitive way possible. This research is particularly applicable for civil applications such as construction and monitoring of difficult to access …
The Problem-Solving Workshop: Adapting Process Improvement Methodologies For K-12 Educators, Madison Chan
The Problem-Solving Workshop: Adapting Process Improvement Methodologies For K-12 Educators, Madison Chan
Honors Theses
Lean and Six Sigma have been lauded in the manufacturing sector for their ability to streamline processes, reduce waste, minimize variation and defects, and improve the bottom line. Although these methodologies have begun to spread to other industries, their impact has been relegated to certain areas and has largely missed others. One area that bears strong consideration is education. Education is heavily process-based and notoriously tight on resources. It is hypothesized that if educators were taught the basics of these strategies and were able to implement them in the classroom setting, the effectiveness of both teaching strategies and classroom operations …
Mathematical Modeling Of A Variable Mass Rocket’S Dynamics Using The Differential Transform Method, Ashwyn Sam
Mathematical Modeling Of A Variable Mass Rocket’S Dynamics Using The Differential Transform Method, Ashwyn Sam
Honors Theses
In this paper, the mathematical modelling of a rocket with varying mass is investigated to construct a function that can describe the velocity and position of the rocket as a function of time. This research is geared more towards small scale rockets where the nonlinear drag term is of great interest to the underlying dynamics of the rocket. A simple force balance on the rocket using Newton’s second law of motion yields a Riccati differential equation for which the solution yields the velocity of the rocket at any given time. This solution can then be integrated with respect to time …
The Analysis Of Erlanger Hospital’S Suture Inventory Management Operations, Amanda George
The Analysis Of Erlanger Hospital’S Suture Inventory Management Operations, Amanda George
Honors Theses
This paper evaluates the impact of using mechanical engineering and operations management principles to an inventory management system in Erlanger Hospital. Erlanger Hospital is a local, nonprofit hospital system in Chattanooga. Erlanger serves as a tertiary referral hospital and a Level I Trauma Center in the region. Therefore, they are heavily depended on during times of crisis or emergency [2]. This study focuses specifically on reducing the loss and ultimate waste of sutures across Erlanger’s surgery wing. A criteria for the appraisal of using mechanical and manufacturing engineering to improve the current system is established based on existing data regarding …
Computational Simulation Of The Paw-04 Nozzle Configuration, Juan Hernandez
Computational Simulation Of The Paw-04 Nozzle Configuration, Juan Hernandez
Honors Theses
The research was based on the 4th Propulsion Aerodynamics Workshop which was organized by the American Institute of Aeronautics and Astronautics (AIAA) Air Breathing Propulsion System Integration Technical Committee and its objective was to assess the accuracy and numerical prediction capabilities of Computational Fluid Dynamics (CFD). It focused on the work of Behrouzi and McGuirk where they tested two different nozzle configurations under set boundary conditions. The nozzle configurations included a high aspect ratio rectangular nozzle with a clean exit and the same nozzle with an aft-deck attached to the exit. Three different unstructured grids were generated for the clean …
Analysis And Proposed Improvement Of Hamilton County Vw Elab Equipment, Hiroshi Yanagida
Analysis And Proposed Improvement Of Hamilton County Vw Elab Equipment, Hiroshi Yanagida
Honors Theses
Digital fabrication laboratories have revolutionized project based learning within K-12 STEAM education curriculum. However, classroom utilization of the labs often requires excessive machine hours to accomplish, and this often leads to rapid machine depreciation and disrepair. Many educators do not have the time to repair their equipment while developing curriculum and engaging with their students. This study focuses on building a repair history for common digital fabrication equipment, which includes Prusa i3 Mk2S FDM 3D printers, laser cutters, and CNC routers. Data were collected over a 6 month period to find which machines encountered the most issues. The 3D printers …
The Effect Of Soil Saturation On The Heat Transfer Rate In A Controlled Environment For Application To Ground Source Heat Pumps, William Barnard
The Effect Of Soil Saturation On The Heat Transfer Rate In A Controlled Environment For Application To Ground Source Heat Pumps, William Barnard
Honors Theses
With the worldwide push for environmentally friendly technology, the topic of geothermal systems has only become more important. Ground Source Heat Pumps (GSHPs) are heat pumps that take advantage of the natural temperature difference between the soil and the air to decrease the amount of power necessary to heat an area. A GSHP has been shown to be capable of increasing efficiency by 3 or 4 times the amount of a conventional heating and cooling system [4]. To take advantage of the full capabilities of a GSHP, one needs to understand what factors can increase or decrease efficiency. While research …
Ground Line Moment Analysis Of Body Extended 161kv Transmission Towers, Phillip York
Ground Line Moment Analysis Of Body Extended 161kv Transmission Towers, Phillip York
Masters Theses and Doctoral Dissertations
This study simplified the analysis required for the extension of a single circuit tangent 161kV transmission tower. The parameters were modified and modern criteria used to evaluate the tangent tower with various body extensions. The basis of analysis for the extended lattice towers compared the ground-line moment of the tallest tower in each class to the ground-line moment of various tower heights. This study analyzed 62,640 design input combinations for the tower using modern NESC loadings and determined which combinations fall below the maximum design ground-line forces. The ground-line force analysis was modernized by lowering the overload factors from their …
Use Of Pv/T Panels To Meet The Building Loads Of Light Commercialized Buildings, Sadhvi Arora
Use Of Pv/T Panels To Meet The Building Loads Of Light Commercialized Buildings, Sadhvi Arora
Masters Theses and Doctoral Dissertations
This thesis deals with the analysis of a Photo Voltaic Thermal (PV/T) panel that is capable of producing simultaneously electric power and low-grade heat energy by absorbing the solar energy striking on its surface. A simple mathematical model is developed to estimate the electric power and heat energy gained by the PV/T panel. A water-to-water heat pump is employed that operates by absorbing the low-grade heat energy obtained from PV/T panel, in its evaporator, in order to produce high temperature hot water in its condenser. The high temperature hot water thus produced can be employed to meet the winter heating …
A Method For Characterization Of Single-Event Latchup Technologies As A Function Of Geometric Variation, Matt Joplin
A Method For Characterization Of Single-Event Latchup Technologies As A Function Of Geometric Variation, Matt Joplin
Masters Theses and Doctoral Dissertations
Complementary metal-oxide-semiconductor (CMOS) technology is the dominant integrated circuit (IC) technology in modern electronics systems. As CMOS comprises of p-channel and n-channel transistors, there are parasitic PNPN paths that act as cross-coupled bipolar transistors capable of creating low-impedance paths between the power supply rails known as the “latchup” state. Latchup is destructive and requires a power cycle to restore operation. Latchup can be stimulated by ionizing radiation such as a high-energy proton or heavy-ions from deep space, resulting in a significant vulnerability in CMOS space systems. The sensitivity of an IC to single-event latchup (SEL) depends on various process parameters …
The Response Of Fuzzy Electronics To Ionizing Radiation, Simar Singh
The Response Of Fuzzy Electronics To Ionizing Radiation, Simar Singh
Honors Theses
Small satellites such as CubeSats operate under environmental constraints that are outside of typical commercial specifications. Such constraints include the ability to operate over an extended temperature range and during exposure to ionizing radiation. Nevertheless, commercial technologies are being implemented in CubeSat spacecraft because of the low-cost, low-power, and space savings requirements often achievable with advanced microelectronics [1]. Due to flexibility and the ability to handle uncertainty, fuzzy logic is viable for satellite control while meeting the strict design requirements of a CubeSat. This work evaluates the response of fuzzy control logic to ionizing radiation and compares the response to …
Energy Sustainability Analysis Of A Baja Test Facility, Seth Bishop
Energy Sustainability Analysis Of A Baja Test Facility, Seth Bishop
Honors Theses
The objective of this paper is to study the viability of building a Baja SAE competition site so that UTC could host events in the future. Part of this includes defining a building size in square feet and estimating the construction cost. Once that is accomplished it is necessary to determine what equipment may be used at the site, how much power each piece of equipment would use, and how many hours each would be used for within the year. With this information it is then possible to estimate the annual power consumption for a competition year and a regular …
Improving Alternative Fuel Efficiency With Water Injection, Connor Strawn
Improving Alternative Fuel Efficiency With Water Injection, Connor Strawn
Honors Theses
Alternative fuel internal combustion engines (ICEs) have been increasing in popularity as the harmful effects of pollution and the need for a sustainable energy source are becoming more apparent. Two alternative fuels, E85 and hydrogen gas, are considered in this study. These fuels are renewable and have less emissions than traditional fuels, but there are many inherent disadvantages to their use. Water injection could alleviate some of the issues that plague these fuels. To test this, a Briggs and Stratton Baja engine was used, with and without water injection. Gasoline with water injection showed better performance than without: the power …
Design Of A Pneumatic Conveying Test Loop For Laboratory Testing, Natalie Burdine
Design Of A Pneumatic Conveying Test Loop For Laboratory Testing, Natalie Burdine
Honors Theses
Pneumatic conveying is the transportation of material through a closed conveying line in a gas medium via a pressure differential. In industry, pneumatic conveying is used extensively to handle materials: specifically, bulk solids and powders. 80% of all transported materials are bulk solids and pneumatic conveying is currently experiencing industry growth at a rate of 6.4% annually. Industrial pneumatic conveyor suppliers use specialized testing systems to make design decisions regarding specific applications, taking into account the conveyed material, the structure of the plant in which the system will be installed, and desired system characteristics such as necessary filtering or safety …
Creating A Zero + Energy Building Model, Ashley N. Thompson
Creating A Zero + Energy Building Model, Ashley N. Thompson
Honors Theses
The goal of this project was to create an accurate representation of a zero + energy home both for physical experimentation and for numerical modeling. This means that the home does not rely on power from the grid, but only on alternative energy sources such as solar. The project consists of two major subcategories. The electrical portion of the project consists of implementing the energy source and control system, and the mechanical portion of the project consists of thermal analysis, thermal flow simulations, and physical construction. A 50 W solar panel was chosen as an energy source, which directs power …
Determining Energy Output In Manual And Automated Solar Arrays, James K. Ayres
Determining Energy Output In Manual And Automated Solar Arrays, James K. Ayres
Honors Theses
The scope for the project was to design and construct a system that could be used to both manually and automatically track the sun using solar panels to demonstrate engineering principles for classroom and laboratory experiments at both the primary and secondary education levels. For ease of demonstration, a manual and automatic tracker was designed for the experiment. Using a standard camera tripod, the solar panels were attached to fabricated mounts to allow for omnidirectional movement. For the automated, or active tracker, an Ardunio Uno microcontroller was used in conjunction with two 180˚ servos to adjust the active tracker solar …
Solution Of Fully-Coupled Shallow Water Equations And Contaminant Transport Using A Primitive Variable Riemann Solver And A Semi-Discrete Supg Method, Faranak Behzadi
Solution Of Fully-Coupled Shallow Water Equations And Contaminant Transport Using A Primitive Variable Riemann Solver And A Semi-Discrete Supg Method, Faranak Behzadi
Masters Theses and Doctoral Dissertations
In the present dissertation, a finite volume and a finite element model are developed and tuned for the solution of the fully-coupled two-dimensional Shallow Water and Contaminant transport Equations with arbitrary bed topography and wetting-drying fronts. A Riemann-solver finite volume scheme, using primitive variables rather than conserved variables, and a semi-discrete Streamline Upwind Petrov-Galerkin (SUPG) method in finite element context are applied to compare the performance of these two numerical models. The Riemann-solver scheme is based on the unstructured finite volume discretization using primitive-variable Roe-flux approximation with an entropy fix. Second-order accuracy in space and time, an implicit scheme based …
Least Squares Spectral Element Method For Laminar And Turbulent Flows, –Continuous And Discontinuous Approaches–, Jaber Javanshir Hasbestan
Least Squares Spectral Element Method For Laminar And Turbulent Flows, –Continuous And Discontinuous Approaches–, Jaber Javanshir Hasbestan
Masters Theses and Doctoral Dissertations
In this research, application of a least squares spectral element method for compressible laminar and turbulent flow problems is investigated. For the turbulent Reynolds Averaged Navier-Stokes (RANS), a modified Spalart-Allmaras (SA) turbulence model is employed and integrated with the mean flow equations in a segregated fashion. Two different approaches are presented for solving the SA model using the least squares method. The first method represents a simple rearrangement of the equation. However, proper arrangement of the SAmodel is required in order to produce a stable scheme for the least squares methodology. The second approach is into divide the SA equation …
Wireless Voice Amplification Device For Weak Patients, Daniel Alexander Johnson
Wireless Voice Amplification Device For Weak Patients, Daniel Alexander Johnson
Honors Theses
Abstract – One problem that nurses and doctors face when treating a very weak patient is difficulty of communication. Sometimes patients become so weak that they are barely able to speak above a whisper without completely exerting themselves. Often nurses will have to put their ear directly in front of a patient’s mouth in order to hear what the patient is saying over the ambient noise in a hospital room. This becomes an even bigger problem when several patients are together in a single room and the ambient noise levels rise. One way to solve this problem would be to …