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Articles 1351 - 1380 of 2904
Full-Text Articles in Engineering
Multisensory Integration For Adaptive Physical Human-Robot Interaction, Isura Ranatunga
Multisensory Integration For Adaptive Physical Human-Robot Interaction, Isura Ranatunga
Electrical Engineering Dissertations - Archive
Automated systems and have become increasingly prevalent in the 21st century. With their increased processing power, personal and home robotics has finally come within reach of the public. For robots to finally work with and around humans there are some challenges to be overcome. Some of these include complex social interaction, safety, identifying human intent, unpredictable physical interaction, and uncertain dynamic environments. This research focuses on safe, robust, and intuitive physical interaction with humans utilizing multiple sensor modalities.In this thesis a solution for adaptive physical human-robot interaction is proposed. The proposed framework consists of three parts. Dynamics compensation: adaptive dynamics …
Optimal Tracking Control Of Uncertain Systems: On-Policy And Off-Policy Reinforcement Learning Approaches, Hamidreza Modares
Optimal Tracking Control Of Uncertain Systems: On-Policy And Off-Policy Reinforcement Learning Approaches, Hamidreza Modares
Electrical Engineering Dissertations - Archive
Over the last few decades, strong connections between reinforcement learning (RL) and optimal control have prompted a major effort towards developing online and model-free RL algorithms to learn the solution to optimal control problems. Although RL algorithms have been widely used to solve the optimal regulation problems, few results considered solving the optimal tracking control problem (OTCP), despite the fact that most real-world control applications are tracking problems. On the other hand, existing methods for solving OTCP require complete knowledge of the system dynamics. This research begins with developing an adaptive optimal algorithm for linear quadratic tracking problem (LQT). A …
Design And Fabrication Of Guided-Mode Resonance Devices, Guoliang Chen
Design And Fabrication Of Guided-Mode Resonance Devices, Guoliang Chen
Electrical Engineering Dissertations - Archive
Guided-mode resonance (GMR) effect based on waveguide grating structure has been attracting plenty of attention in recent years due to its abundant application in energy, information technology, and sensors. This dissertation aims to develop new GMR devices and apply them in the above fields. Initially thermoelectric devices integrated with optical resonance absorbers are demonstrated. We design the absorbers with rigorous numerical methods and fashion experimental prototypes by thin-film deposition, patterning, and etching. A ~2.5-?m-thick p-type heavily doped polysilicon film on a ~2-?m layer of thermally grown SiO2 enables guided-mode resonance. The SiO2 layer additionally serves to thermally insulate the polysilicon …
Revisiting Control Establishments For Emerging Energy Hubs, Vahidreza Nasirian
Revisiting Control Establishments For Emerging Energy Hubs, Vahidreza Nasirian
Electrical Engineering Dissertations - Archive
Emerging small-scale energy systems, i.e., microgrids and smartgrids, rely on centralized controllers for voltage regulation, load sharing, and economic dispatch. However, the central controller is a single-point-of-failure in such a design as either the controller or attached communication links failure can render the entire system inoperable. This work seeks for alternative distributed control structures to improve system reliability and help to the scalability of the system. A cooperative distributed controller is proposed that uses a noise-resilient voltage estimator and handles global voltage regulation and load sharing across a DC microgrid. Distributed adaptive droop control is also investigated as an alternative …
Design And Fabrication Of Iridium Oxide-Based Multi-Electrode Array For Biomedical Applications, Cuong Manh Nguyen
Design And Fabrication Of Iridium Oxide-Based Multi-Electrode Array For Biomedical Applications, Cuong Manh Nguyen
Electrical Engineering Dissertations - Archive
Multi-electrode array (MEA) has emerged as one of the most important and common tools to monitor physiological and biological signals. Advanced micro-electro-mechanical systems (MEMS) and innovative nanofabrication technologies provide means to fabricate micro-scale MEAs for implantable bio-applications. One of the prominent advantages of such miniature electrodes is to minimize tissue damage or injuries during surgical implantation. The micro-scale electrodes are normally coated with materials or functionalized with proteins and enzymes to sense different analyates. Iridium oxide (IrOx) owning with many important traits such as biocompatibility, high corrosion resistance in electrolyte materials, pH-sensitivity, large surface-to-volume ratio, and high charge storage has …
A Lidar-Based Auto Hydro Breakline Generation Algorithm For Standing Water Bodies, George John Toscano
A Lidar-Based Auto Hydro Breakline Generation Algorithm For Standing Water Bodies, George John Toscano
Electrical Engineering Dissertations - Archive
Airborne Light Detection and Ranging (LiDAR) is a sensor that can generate terrain elevation and intensity data of very large areas with high precision and dense resolution. The intensity and elevation are co-registered, which eliminates the need for tedious registration after the fact. This combined LiDAR data can be used to classify different topographic features. Given the enormous amount of such data generated all over the world, total automation in these classification processes in a batch process is highly desired if not a critical need. In this dissertation, a novel LiDAR-based automated standing waterbody extraction (LASWE) algorithm is presented. The …
Embedding Integrated Rfid Sensors Into Fiber Reinforced Plastics During The Manufacturing Process, Billy Joe Gray
Embedding Integrated Rfid Sensors Into Fiber Reinforced Plastics During The Manufacturing Process, Billy Joe Gray
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
This research evaluates the impact of embedding a Radio Frequency Identification (RFID) tag into the structure of a fiber reinforced polymer (FRP). The first portion of the research evaluates the mechanical impacts of embedding the tag through simulation of the stresses that the polymer will be exposed to and then comparing with compression and shear testing of the polymer parts. The second portion of the research evaluates the impact of the reinforcement materials on the transmission of radio frequency to and from the tag. The last portion of the research looks at how the costs of RFID compare to the …
Surface Engineered Biosensors For The Early Detection Of Cancer, Muhymin Islam
Surface Engineered Biosensors For The Early Detection Of Cancer, Muhymin Islam
Electrical Engineering Dissertations - Archive
Cancer commences in the building block of human body which is cells and in most of the cases remains silent at early stage. Diseases are only expressed at molecular and cellular level at primary stages. Recognition of diseases at this micro and nano level might reduce the mortality rate of cancer significantly. This research work aimed to introduce novel electronic biosensors for for identification of cancer at cellular level. The dissertation study focuses on 1) Label-Free Isolation of Metastatic Tumor Cells Using Filter Based Microfluidic device; 2) Nanotextured Polymer Substrates for Enhanced Cancer Cell Isolation and Cell Growth; 3) Nanotextured …
Forecasting Of Wind, Pv Generation, And Market Price For The Optimal Operations Of The Regional Pev Charging Stations, Piampoom Sarikprueck
Forecasting Of Wind, Pv Generation, And Market Price For The Optimal Operations Of The Regional Pev Charging Stations, Piampoom Sarikprueck
Electrical Engineering Dissertations - Archive
The transition from the conventional spark ignition engine vehicles to the electric vehicular technologies helps reduce greenhouse gas (GHG) emissions as well as improve the energy efficiency in the transportation sector. In the transformation of the electric vehicle, the hybrid electric vehicle (HEV) has evolved into the plug-in electric vehicle (PEV) due to the advancement in battery technologies that extend the electric driving distance of vehicles; however, this trend also creates concern among PEV users about how long or how far they might travel per battery charge. A well-planned charging infrastructure with a fast (level 3) charging station is critical …
Sparse Sampling And Array For Wireless Communications, Qiong Wu
Sparse Sampling And Array For Wireless Communications, Qiong Wu
Electrical Engineering Dissertations - Archive
In recent years, sparse sampling and array, such as coprime sampling, nested sampling, nested array, attract attention for their potential to estimate autocorrelation coefficients with all lags, and to calculate the power spectrum density. But this theoretical merit is based on the premise that the input signals are wide-sense stationary. This dissertation first implements the coprime sampling for non-stationary signal, which still decreases the computational complexity but suffers from high variances due to lack of observations. Then, this algorithm is extended to calculate ambiguity function in the radar system, and several practical guidelines are concluded in order to conduct the …
Virtual And Hardware Prototyping Of A Modular Multilevel Inverter For Photovoltaics, Shweta Hardas
Virtual And Hardware Prototyping Of A Modular Multilevel Inverter For Photovoltaics, Shweta Hardas
Electrical Engineering Theses - Archive
This thesis details the idea of virtual and hardware prototyping of a distributed controlled multilevel inverter used as a grid-tie interface for photovoltaic. The system framework consists of multilevel inverters composed of solar panel array connected in series with the inverter module, enabling the use of renewable energy resources. The inverter module is built of buck-boost converter and a cascaded h-bridge inverter, which converts the obtained independent DC voltage source from each of the solar array to AC. With the increasing convenience of using a small photovoltaic grid for residential purposes, this system can be used to facilitate various DC …
Du06, Center For Orthopaedic Biomechanics, Michael D. Harris, Phd, Kevin Shelburne, Phd
Du06, Center For Orthopaedic Biomechanics, Michael D. Harris, Phd, Kevin Shelburne, Phd
Natural Knee Data
No abstract provided.
Is Service-Learning Worth It?: A Mixed-Methods Study Of Faculty’S Service-Learning Experiences, Joan M. Blakey, Shirley Theriot, Mary Cazzell, Melanie L. Sattler
Is Service-Learning Worth It?: A Mixed-Methods Study Of Faculty’S Service-Learning Experiences, Joan M. Blakey, Shirley Theriot, Mary Cazzell, Melanie L. Sattler
Civil Engineering Faculty Publications - Archive
Service-learning benefits students, communities, institutions of higher learning, and faculty. Most studies have focused on the impact of service-learning on students; however, there is a dearth of mixed-methods research examining faculty use of service-learning. Using a two-phase, exploratory, mixed-methods design, the purpose of this study was to understand the factors that influenced 24 faculty fellows’ engagement with service-learning. The qualitative component examined four faculty’s in-depth experiences with service-learning to understand the meaning they assigned to those experiences and to identify key themes that affected engagement. The quantitative phase of the study explored the extent to which 20 additional faculty fellows’ …
Topology Optimization For Thin Walled Structures Utilizing Simp Method By Additive Manufacturing Using Optimized Conditions, Sajith Anantharaman
Topology Optimization For Thin Walled Structures Utilizing Simp Method By Additive Manufacturing Using Optimized Conditions, Sajith Anantharaman
Mechanical and Aerospace Engineering Theses - Archive
The objective of this research is to manufacture topology optimized structure by additive manufacturing. Topology Optimization is a method of structural optimization which gives the optimum material distribution in a design domain. This material distribution is then manufactured by additive manufacturing. Additive manufacturing can manufacture complex shapes quite easily since it works by layer-by-layer. This is an on-going field of research and not many optimization algorithms make use of the advantages of additive manufacturing. Numerous researches are done in the field of optimization which are directed towards Homogenization and Solid Isotropic material with Penalization (SIMP). But most of the methods …
Diffusion And Elastoplastic Analyses Of Polycrystalline Magnesium For Solid State Hydrogen Storage Application, Amey Mathakari
Diffusion And Elastoplastic Analyses Of Polycrystalline Magnesium For Solid State Hydrogen Storage Application, Amey Mathakari
Mechanical and Aerospace Engineering Theses - Archive
Solid state hydrogen storage can be an effective way of storing hydrogen as an energy source for mobile applications. The advantage includes high energy density, low setup cost, safe operation, abundance of metal hydrides, low maintenance, etc. Magnesium is one of the potential metals for the application. However, sluggish desorption kinetics of magnesium requiring relatively high operation temperature has hindered its practical realization. In the present study, an attempt is made to analyze effects of grain boundary on diffusion and diffusion induced stresses in polycrystalline magnesium. Grain boundaries in nanostructured magnesium can undergo severe plastic deformations during the hydrogen insertion …
Simulation And Performance Analysis Of Ejector Nozzle In A Low-Bypass Turbofan Engine Using Npss, Hatim Soeb Rangwala
Simulation And Performance Analysis Of Ejector Nozzle In A Low-Bypass Turbofan Engine Using Npss, Hatim Soeb Rangwala
Mechanical and Aerospace Engineering Theses - Archive
Nozzles for propulsive applications in airbreathing engines have long been studied to augment thrust and reduce the size of the engine. They are critical elements of the engine as they convert the internal energy into kinetic energy, thereby producing thrust. Fixed-geometry nozzles are operated optimally only at a particular set of flight conditions and are not efficient at off-design conditions. To improve off-design performance, variable geometry nozzles can be utilized which require complex mechanisms that ultimately increase weight and susceptibility to failure. Ejector nozzles provide variable geometry capability via aerodynamically varying the effective area ratios of the core and bypass …
Assessing Interlaminar Shear Stress-Strain Curves In Tape Composites Based On The Flat-Plate Torsion Method, Gary Steven Grohman
Assessing Interlaminar Shear Stress-Strain Curves In Tape Composites Based On The Flat-Plate Torsion Method, Gary Steven Grohman
Mechanical and Aerospace Engineering Theses - Archive
Composites are attractive for structural applications in the aerospace industry for their high strength to weight ratio, stiffness, and low density. The development and implementation of composite structures has grown rapidly through the aerospace industry exceeding our ability to characterize the material properties due to costly and time consuming test methods. The ability to fully characterize the nonlinear stress-strain relationship in the 1-3 and 2-3 principal planes up to the point of failure is extremely important for predicting failures in composites. The principal directions for composites are the fiber direction, transverse direction, and the thru thickness direction, commonly referred to …
Heat Removal Analysis Using Ntu Microscopic Theory And Experimental Fluid Testing Of Radaitors, Pumps And Fans For The Thermal Management System Of Formula Sae Electric Racecar, Shahzad Shahrukh Bulsara
Heat Removal Analysis Using Ntu Microscopic Theory And Experimental Fluid Testing Of Radaitors, Pumps And Fans For The Thermal Management System Of Formula Sae Electric Racecar, Shahzad Shahrukh Bulsara
Mechanical and Aerospace Engineering Theses - Archive
Formula SAE at UT Arlington has always been building well engineered race cars, further being one of the top teams in The United States. However, an electric race car being first in the fleet, cooling of electric motors played a vital role. The thermal system being significantly different from combustion cars, consists of a lower heat application. It is always favorable to maintain electronics as close to ambient temperature as compared to its counter hydro-mechanical engines. To attain the objective, a complete thermal & fluid analysis was carried out using the NTU method/ microscopic theory and experimental results associated towards …
Training Algorithm For Radial Basis Function Classifier, Yilong Hao
Training Algorithm For Radial Basis Function Classifier, Yilong Hao
Electrical Engineering Theses - Archive
The computational complexity of kernel machines and their poor performance in the multi-label classification case is a major bottleneck in their success. In this thesis we present a systematic two step batch approach for constructing and training a new multiclass kernel machine (MKM). Unlike other kernel learning algorithms, the proposed paradigm prunes the kernels, and uses Newton’s method to improve the kernel parameters. In each iteration, output weights are found using orthogonal least squares. The proposed hybrid training algorithm is compared with those least square support vector machines(LS-SVM) and support vector machines(SVM). Simulations results on many benchmark and real life …
Design Of A Real Time Reconfigurable Bioreactor, Amol Vengurlekar
Design Of A Real Time Reconfigurable Bioreactor, Amol Vengurlekar
Electrical Engineering Theses - Archive
In this thesis we present the design of a reconfigurable continuous culture bioreactor that allows researchers to grow microorganisms in a controlled environment for long periods of time, as long as several months. The bioreactor monitors the experiment and measures the growth of microorganisms. A continuous culture bioreactor is an important tool that biologists use for research, most notably to study the response of bacteria towards drugs. This helps in the fight against the evolution of drug resistance in bacteria and other pathogens.The bioreactor acts like an isolated ecosystem. It periodically exposes the microorganisms to drugs that hamper their growth. …
Analysis Of Thin-Walled Cylindrical Composite Shell Structures Subject To Axial And Bending Loads: Concept Development, Analytical Modeling And Experimental Verification, Sthanu Mahadev
Mechanical and Aerospace Engineering Dissertations - Archive
Several studies have focused on the modeling and response characterization of composite structural members, with particular emphasis on thin-walled cylindrical composite shells. This class of shell configurations is explored to determine their mechanical response in primary aerospace structural members. The present work is focused on formulating a modified composite shell theory prognosis methodology for investigating the structural response of thin-walled cylindrical shell type composite configurations under axial and bending loads, respectively. The prime motivation to develop this theory arises from its capability to generate simple yet accurate closed-form analytical results that can efficiently charecterize cylindrical composite shell constructions. This work …
Design Of Next Generation Antenna Mounts In Telecommunication Towers With Low Effective Projected Area, Ruben Gregory Puthota Dominic Savio
Design Of Next Generation Antenna Mounts In Telecommunication Towers With Low Effective Projected Area, Ruben Gregory Puthota Dominic Savio
Mechanical and Aerospace Engineering Theses - Archive
Design of new antenna mount with low effective projected area (EPA) and high load carrying capacity for telecommunication towers is the purpose of this thesis. The main aim is to reduce the EPA of the mount against the wind pressure direction at the desired elevation from ground by reducing the mount frame structure parts compared to the previous mount designs used in the market. The model in itself has to withstand its dead weight, operator’s weight along with five antenna-radio units. The new model has been designed with a single horizontal frame and four supporting structure for EPA reduction and …
Characterization Of Flapping Wing Aerodynamics And Flight Dynamics Analysis Using Computational Methods, Alok Ashok Rege
Characterization Of Flapping Wing Aerodynamics And Flight Dynamics Analysis Using Computational Methods, Alok Ashok Rege
Mechanical and Aerospace Engineering Dissertations - Archive
Insect flight comes with a lot of intricacies that cannot be explained by conventional aerodynamics. Even with their small-size, insects have the ability to generate the required aerodynamic forces using high frequency flapping motion of their wings to perform different maneuvers. The maneuverability obtained by these flyers using flapping motion belies the classical aerodynamics theory and calls for a new approach to study this highly unsteady aerodynamics. Research is on to find new ways to realize the flight capabilities of these insects and engineer a micro-flyer which would have various applications, ranging from autonomous pollination of crop fields and oil …
Comprehensive Design Analysis Of Thick Fr-4 Qfn Assemblies For Enhanced Board Level Reliability, Abhishek Nitin Deshpande
Comprehensive Design Analysis Of Thick Fr-4 Qfn Assemblies For Enhanced Board Level Reliability, Abhishek Nitin Deshpande
Mechanical and Aerospace Engineering Theses - Archive
Quad Flat No-lead package (QFN) is one of the most cutting-edge technologies emerged in the market, exhibiting high performance and efficiency with unparalleled cost effectiveness. QFN, a leadless package, is an ideal choice for applications where size, weight thermal and electrical characteristics are critical, particularly in mobile and handheld devices. Applications like automotive, defense and high current circuits require the package to be mounted on thick printed circuit boards (PCB). But using thick PCBs (>3mm) is detrimental to the package reliability. The motivation of this work is to understand the effect of several package parameters affecting reliability and optimize …
Properties Of Microcement Mortar With Nano Particles, Narasimha Reddy Alimeneti
Properties Of Microcement Mortar With Nano Particles, Narasimha Reddy Alimeneti
Civil Engineering Theses - Archive
Carbon nanotubes (CNT) and Carbon nanofibers (CNF) are one of the toughest and stiffest materials in the world presently with extreme properties yet to be discovered in terms of elastic modulus and tensile strength. Due to the advanced properties of these materials they are being used in almost all fields of science at nanolevel and are being used in construction industry recently for improvement of material properties. Microcement is fine ground cement which as half the particle size of ordinary Portland cement. In this research the behavior of cement mortar of micro cement with the addition of nanoparticles is studied.Due …
Effect Of Preformed Chloramines And Chlorine To Ammonia Ratio On The Formation Of N-Nitrosodimethylamine (Ndma) In Trwd East Texas Raw Water Delivery System, Khidir Hamad
Civil Engineering Theses - Archive
Tarrant Regional Water District (TRWD) pumps untreated raw water from Richland Chambers and Cedar Creek reservoirs in East Texas to provide water to several customer cities including Arlington and Fort Worth. TRWD adds chloramines to the pipeline to combat biofilm growth, that reduces pipeline capacity and increases pumping costs, and to control zebra mussels, that clog intake structure screens and the pump wet wells. However, addition of chloramines leads to the formation of N-nitrosodimethylamine (NDMA), a potent carcinogen, by reaction of chloramines with nitrogenous organic precursors possibly present in the raw water. NDMA formation presents a challenge to TRWD because …
Fate Of Bulk Hypochlorite Solutions In Two Water Treatment Facilities, Anna Breytus
Fate Of Bulk Hypochlorite Solutions In Two Water Treatment Facilities, Anna Breytus
Civil Engineering Theses - Archive
Measurement of oxyhalides in various strength hypochlorite solutions has been an issue of importance in the last decade, especially in view of the current aim of Homeland Security to reduce the usage of chlorine gas. Hypochlorite solutions have a potential of introducing disinfection by-products when used for water treatment. Previous works have shown the possibility of high levels of chlorate and perchlorate in high strength hypochlorite solutions. Perchlorate is an endocrine disruptor that inhibits iodide intake by the thyroid, thus reducing the production of essential thyroid hormones. Chlorate also has several adverse effects on the blood and thyroid systems. Perchlorate …
Arcpy Code, Mohammadhossein Alipour
Arcpy Code, Mohammadhossein Alipour
Streamflow Prediction under Extreme Data-scarcity
No abstract provided.
Quantitative Non-Destructive Evaluation Of Rebar Diameter And Corrosion Damage In Concrete Using Ground Penetrating Radar, Md Istiaque Hasan
Quantitative Non-Destructive Evaluation Of Rebar Diameter And Corrosion Damage In Concrete Using Ground Penetrating Radar, Md Istiaque Hasan
Civil Engineering Dissertations - Archive
The purpose of this study is to develop new methods for quantitative estimation of rebar diameter and loss of area of rebar due to corrosion using Ground Penetrating Radar (GPR). The existing methods of determining the rebar diameter using GPR are not accurate and the existing methods for evaluating corrosion using GPR are qualitative. The study included in this dissertation uses a 2.6 GHz antenna to estimate the diameter of rebar using two different approaches. The approaches use digital image processing of GPR ragargrams and maximum normalized reflection amplitude form the rebar to estimate the diameter. A novel method to …
Discrete Element Modeling Of Geogrid Reinforced Granular Media, Asheesh Pradhan
Discrete Element Modeling Of Geogrid Reinforced Granular Media, Asheesh Pradhan
Civil Engineering Dissertations - Archive
Geogrids have proven to be economical solution in improving ground conditions for construction in foundations, retaining walls, railway tracks, and pavements. Hence researchers have started studying the geogrid reinforcement in detail to understand the working of geogrid and parameters affecting it. Following the advent of faster computers and efficient algorithms researcher have started using discrete element method (DEM) to study geogrid reinforcement since DEM provides particulate level of interaction and understanding and is the closest resemblance of the physical phenomenon. However, the research works are widely spread lacking comprehensive review of factors that can affect such models. This research studies …