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Articles 2731 - 2760 of 11508
Full-Text Articles in Engineering
Improving Demand Response Strategies Utilizing Data Collected By Industrial Assessments To Reduce Cost For Users, Monsur Habib
Improving Demand Response Strategies Utilizing Data Collected By Industrial Assessments To Reduce Cost For Users, Monsur Habib
Theses and Dissertations
Demand Response Programs have the potential to incentivize users to modify their electricity consumption pattern based on their given price and any bonuses that come along with it. Through the effective utilization of renewable sources and energy storage devices, household electricity bills can be reduced since the consumption of electricity during high price periods can be replaced by either renewable resources or electricity from energy storage devices. The balancing of energy demand and generation using the latest management technologies is considered as an immediate requirement to improve the operation of electrical distribution networks and peak demand management. Many Independent system …
The Processing And Characterization Of Nano Composite Nano Fibers For Various Applications, Md Toukir Hasan
The Processing And Characterization Of Nano Composite Nano Fibers For Various Applications, Md Toukir Hasan
Theses and Dissertations
The study of this thesis focuses on the force spinning of polymer composite nanofibers for antibacterial and energy storage applications. For energy application, Polyacrylonitrile (PAN), Polymethyl methacrylate (PMMA) polymers with active materials (Sn & Ti) and for antibacterial purposes, Polyvinylpyrrolidone (PVP) and Polyethylene-oxide (PEO) polymers along with NPs (Ag and Cu), both were centrifugally spun to get finer nanofibers. The spun produced nanofibers of each types ascertained the percentage of active materials accurately. Antibacterial test on PEO/Ag composite nanofibers exhibited 100% inhibition efficiency against E. coli and B. cereus bacteria while PVP/Cu, PEO/Cu fibrous membranes showed 97.98%, 98.99% respectively. CuNPs …
Fabrication And Characterization Of Polyvinylidene Fluoride Nanofibers For Energy Harvesting Applications, Jui Vitthal Kharade
Fabrication And Characterization Of Polyvinylidene Fluoride Nanofibers For Energy Harvesting Applications, Jui Vitthal Kharade
Theses and Dissertations
Miniaturization of portable devices demand a power source that does not require recharging or replacement. Piezoelectric energy harvesters are devices that harvest mechanical energy from environment and convert it into electrical energy thus being an ideal candidate for replacing batteries in small devices. Objective of this thesis is to fabricate an energy harvester with efficient energy conversion. In this thesis, the effect of fabricating mechanisms, solvents, and composites on polyvinylidene nanofibers are analysed in order to improve the piezoelectric response of the nanofibers. These nanofibers are then used for fabricating an energy harvester. The energy harvester is implemented in a …
Electrical Characterization Of Conductive Concrete Containing Graphite Powder, K. I. M. Iqbal
Electrical Characterization Of Conductive Concrete Containing Graphite Powder, K. I. M. Iqbal
Theses and Dissertations
Electrically conductive concrete has various potential non-structural functions such as self-sensing, de-icing, and electromagnetic shielding. Since conductive concrete is a composite containing moisture and discrete conductive additives, its electrical properties are very complex. Understanding these properties is the fundamental requirement for developing its non-structural applications. In this research, graphite powder is used as a conductive additive with varying percentages (0% to 30%) by cement paste volume. Both AC impedance analysis and DC measurement are performed in both wet and dry conditions. The results show that the resistivity measured by DC are not consistent because of polarization before/during the measurement. On …
Development Of Injection Molding Pressure Monitoring System Using Piezoelectric Sensor, Mostafa Meraj Pasha
Development Of Injection Molding Pressure Monitoring System Using Piezoelectric Sensor, Mostafa Meraj Pasha
Theses and Dissertations
Injection molding is one of the most popular techniques for global plastic production. With this automation technique, the plastic product can be manufactured at a low cost with a complex geometrical shape. A manufacturing process with the high productivity of an injection molding machine depends on molding pressure and temperature inside the mold cavity. In this research, an experimental work is performed to determine a process monitoring system using asynchronous data acquisition, through the incorporation of wired piezo-ceramic sensor to acquire pressure of injection molding system. This piezoelectric sensor is designed in such a way that, a Bluetooth device can …
In-Situ Alloying Of Cucrfenitial High Entropy Alloy Using Spark Plasma Sintering, Yash P. Patil
In-Situ Alloying Of Cucrfenitial High Entropy Alloy Using Spark Plasma Sintering, Yash P. Patil
Theses and Dissertations
Primary objective of this research was to study the correlation between energy parameters (temperature, time and pressure) of spark plasma sintering (SPS) and design/structural properties (uniform distribution of elements, sever lattice distortion, density), indirectly proving consolidation of a stable High-entropy alloy (HEA) that consists of minimum of five elements. Therefore, powders of five principal elements (CuCrFeNiTi) and one minor element (Al) in near equimolar ratios were used for HEA consolidation using SPS but without mechanical alloying. Overall results demonstrated that the HEA was not generated using heterogenous solution of CuCrFeNiTiAl using SPS. This suggests that the mechanical alloying of CuCrFeNiTiAl …
The Cyber Security Evaluation Of A Wireless And Wired Smart Electric Meter, Patrick Nnaji
The Cyber Security Evaluation Of A Wireless And Wired Smart Electric Meter, Patrick Nnaji
Theses and Dissertations
In this thesis, an Experimental cyber security evaluation of Wireless Smart Electric Meter has been performed under cyber security attacks. The security integrity of data collection from EPM 6100 Power Quality Wireless Smart Electric Meter under a wireless cyber-attack was evaluated. After which the security integrity of data collection from the same Wireless Smart Electric Meter was evaluated under a different configuration. In this Thesis, we tested three different smart meters for their connectivity under different cybersecurity attacks. We compared the security integrity of the three different smart meters to measure their response under different cybersecurity attacks.
Bioprinting A 3d Tubular Structure With Vascular Smooth Muscle Cells To Observe The Process Compatibility, Taieba Tuba Rahman
Bioprinting A 3d Tubular Structure With Vascular Smooth Muscle Cells To Observe The Process Compatibility, Taieba Tuba Rahman
Theses and Dissertations
Printability is the ability to print a reproducible structure using the bioprinting technique. Constructing the relationships between printability and printing parameters of the extrusion printing process is difficult because of the presence of too many independent and inter-correlated factors. For this reason, it is necessary to identify and limit the number of significantly influential factors. In addition, Scaffold based blood vessel fabrication is a key challenge in 3D Bioprinting. As vascular smooth muscle cell (VSMCs) is a major component of blood vessels, the investigation of the behavior and orientation of VSMCs after printing is required to better understand the 3D …
Investigation Of Cell Behavior In 3d Printed Lumen Structures For Capillary Regeneration, Victoria Jade Perez
Investigation Of Cell Behavior In 3d Printed Lumen Structures For Capillary Regeneration, Victoria Jade Perez
Theses and Dissertations
This thesis work successfully generated a coaxial printing setup and process to generate 3D printed tubules. A dual syringe pump mechanism was developed to print tubular structures to investigate cell behavior with a goal to generate future capillary beds. The mechanism involves the use of collagen–alginate tubules and the use of EDTA to increase the porosity of the tubule structures to study their interaction with media and incubation techniques as well as behavior and morphology. Tubules of 1.7% sodium alginate and 0.4% collagen I reacting with 3.2% CaCl2 solution proved to be more stable in both the printing process and …
Production And Characterization Of Polyurethane Fibers By Forcespinning Method And Incorporation Of Luminiscense Nanoparticles, Sunanda Kumar Saha
Production And Characterization Of Polyurethane Fibers By Forcespinning Method And Incorporation Of Luminiscense Nanoparticles, Sunanda Kumar Saha
Theses and Dissertations
In this work, Polyurethane (PU) fine fiber nonwoven mats are generated using the Forcespinning® method. A detailed study focusing on the effect of PU concentration within solutions of N, N Dimethylformamide and the effect of relative humidity (RH) on fiber average diameter and fiber yield is presented. Solutions were prepared with 4 different concentrations, 14, 15, 16 and 17 wt% of PU. It was observed that as concentration of PU increases, average diameter shows a tendency to increase. Production of fibers with RH varying from X to X was analyzed. It was shown that higher RH is convenient for PU …
Investigation Of The Effect Of Process Parameters By Taguchi Method On Structural And Electrical Properties Of Rf Magnetron Sputtered Sio2 & Psi On Si Substrate, Sajid Mahfuz Uchayash
Investigation Of The Effect Of Process Parameters By Taguchi Method On Structural And Electrical Properties Of Rf Magnetron Sputtered Sio2 & Psi On Si Substrate, Sajid Mahfuz Uchayash
Theses and Dissertations
In this work, Taguchi Signal-to-noise (S/N) analysis was applied to investigate the effect of varying three process parameters, namely- sputtering power, working pressure and Ar gas flow rate on the surface, morphological and electrical properties of the RF sputtered SiO2 and Boron doped pSi over Si substrate. The contribution of a particular process parameter on these properties was also inspected by applying Analysis of Variance (ANOVA). SiO2 and pSi thin films were fabricated over Si substrate using RF magnetron sputtering system. Three sets of inputs for the three mentioned process parameters were chosen for sputtering SiO2 and pSi thin films. …
Effect Of Obesity On Knee Joint During Walking And Squatting, Simon Vasquez Iii
Effect Of Obesity On Knee Joint During Walking And Squatting, Simon Vasquez Iii
Theses and Dissertations
This paper analyzes the effect of obesity on the knee joints during squats. This was performed on 2 different subjects by having each squat 30 times at their decided comfortable depth to display some fatigue and effects on the knee joints. Using the VICON NEXUS and AMTI force plates equipment at The University of Texas at Rio Grande Valley Biomechanics Lab, the center of pressure, knee flexion angles, velocity, and ground reaction forces were calculated. The subjects performed the exercises with and without additional weight using a body vest and kettlebell. The ground reaction forces showed a significant increase in …
Investigating Adoption Behavior Of Owned And Shared Autonomous Vehicles: An Updated Technology Acceptance Model, Yellitza Soto
Investigating Adoption Behavior Of Owned And Shared Autonomous Vehicles: An Updated Technology Acceptance Model, Yellitza Soto
Theses and Dissertations
Transportation systems will be likely transformed by the emergence of autonomous vehicles (AVs), either owned privately or used in a shared system (SAVs), which promise for safe, convenient, and efficient mobility, to name a few benefits to the society. The manifestation of (S)AV benefits, however, is still dubious due to the observed public reluctance, or at best neutrality, towards (S)AVs, especially SAVs. The public's perception towards these innovations is still unclear, therefore, a gap remains in the analysis of individuals’ behavioral intention (BI) to use AVs and SAVs. To fill that gap, this study uses a behavioral psychology method. Specifically, …
Effect Of Deposition Conditions On Properties Of Molybdenum Back Electrode For Cu(In,Ga)Se2 Solar Cell And Cu(In,Ga)Se2 Performance Analysis Through Numerical Simulation, Meah Imtiaz Zulkarnain
Effect Of Deposition Conditions On Properties Of Molybdenum Back Electrode For Cu(In,Ga)Se2 Solar Cell And Cu(In,Ga)Se2 Performance Analysis Through Numerical Simulation, Meah Imtiaz Zulkarnain
Theses and Dissertations
In the first part of this research, the effect of the deposition conditions on properties of molybdenum thin-film were investigated to achieve desired characteristics for its application as the back electrode of Cu(In,Ga)Se2 solar cell. DC and RF magnetron sputtering modes were employed and two sputtering parameters namely, working pressure and sputtering power, were varied to determine the sputtering mode and the sputtering conditions best suited for Mo thin-films having required properties. Sputtered Mo samples were characterized to determine their structural and mechanical properties such as preferred growth orientation, crystallinity, grain size, dislocation density, adhesion, and micro strain, and electrical …
Using Single-Molecule Dna Flow-Stretching Experiments To See The Effects Of Temperature And Viscosity, Fatema Tuz Zohra
Using Single-Molecule Dna Flow-Stretching Experiments To See The Effects Of Temperature And Viscosity, Fatema Tuz Zohra
Theses and Dissertations
Deoxyribonucleic acid (DNA) is a highly charged long and semi-flexible polymer of which length is much longer than cell dimensions at least by 1,000-folds. A long linear DNA turns into a crumpled structure to fit into a tiny cell volume by the process known as DNA compaction. In nature, DNA fits into the volume of the cell using DNA compaction by packaging genome material. Various types of protein are involved in DNA compaction. To experiment with various proteins as DNA compaction agents, DNA needs to be stretched out. In our thesis, the effect of temperature and buffer viscosity on DNA …
Effect Of Obesity On Walking To Running And Running To Walking Transitions, Salvador Baruch Alcorta Bautista
Effect Of Obesity On Walking To Running And Running To Walking Transitions, Salvador Baruch Alcorta Bautista
Theses and Dissertations
This work investigates human Walking to Running transition (WRT) and Running to Walking transition (RWT). The focus is to be able to identify the correct WRT and RWT phase jumps. This investigation uses experimental data from the VICON Motion Analysis System (MAS) and of the treadmill WRT and RWT trials. The musculoskeletal model consists of pelvis, femur, tibia, and foot. This investigation uses as reference the work reported in the literature by Diedricj and Warren.. For the calculations in this investigation Excel and Matlab are used to filter the data and calculate the relative phase jumps. This work reports the …
Machinability Of Carbon Fiber Reinforced Polymer (Cfrp) Composites: Modeling And Optimization Using Taguchi Analysis And Multi-Objective Genetic Algorithm, S M Abdur Rob
Theses and Dissertations
Carbon Fiber Reinforced Polymer (CFRP) composites have been widely used in aerospace, automotive, nuclear, and biomedical industries due to their high strength to weight ratio, corrosion resistant durability and excellent thermo-mechanical properties in non-oxidative atmospheres. Machining of CFRP composites has always been a challenge for the manufacturers. In this study, turning operation has been performed on CFRP composites to investigate the effects of cutting parameters namely cutting speed, feed rate and depth of cut on the output characteristics including cutting force, surface roughness and tool wear using Taguchi Analysis. Regression Analysis has been used to develop mathematical model for cutting …
Effect Of Additional Weight On Stability Of Human Squat Exercise, Jose De Jesus Galarza Lozano
Effect Of Additional Weight On Stability Of Human Squat Exercise, Jose De Jesus Galarza Lozano
Theses and Dissertations
The main focus of the study is to analyze the stability of the squat exercise. The squat is a common exercise that persons do for exercise. The study analyze the time series of the normal component of the ground reaction forces and each coordinate of the center of pressure. Theses time series are used to estimate the Lyapunov Exponents using Rosenstein method. MATLAB from Mathworks is used to calculate the graphs and program the methods. We compare this result with the literature and previous experiments. This work gives more information relating the safety of the squat exercise when …
Dual-Axis Acousto-Optic/Electro-Optic Deflectors In Lithium Niobate For Full-Parallax Holographic Video Displays, Mitchell Robert Adams
Dual-Axis Acousto-Optic/Electro-Optic Deflectors In Lithium Niobate For Full-Parallax Holographic Video Displays, Mitchell Robert Adams
Theses and Dissertations
A major limitation of acousto-optic (AO) leaky-mode modulator based holographic displays is their inability to present full-parallax. We propose that full-parallax capabilities can be bestowed on these displays by integrating an electro-optic (EO) phased array into the architecture. We validated this concept by rendering computational models and by fabricating and testing a basic two-axis AO/EO deflector prototype in lithium niobate. This was, to our knowledge, the first instantiation of an integrated, hybrid AO/EO deflector. The prototype had a 6° deflection range along the AO-axis, and a 3° deflection range along the EO-axis. A series of models provide us with a …
Considering Social Impact When Engineering For Global Development, Hans Jorgen Ottosson
Considering Social Impact When Engineering For Global Development, Hans Jorgen Ottosson
Theses and Dissertations
Every manufactured product has an environmental impact, a social impact, and an economic impact. As engineers, we should do our best to understand how our design decisions influence these impacts (the three pillars of sustainability), and at the same time make decisions that collectively lead to maximum positive impacts, or minimum negative impacts on the economy, environment, and society. Many times, engineers show interest and want to design for all three pillars of sustainability but are often constrained to focus on the environmental and economic aspects, leaving out social sustainability due to lack of understanding and resources. In practice, this …
Concepts For Rapid-Refresh, Global Ocean Surface Wind Measurement Evaluated Using Full-System Parametric Extrema Modeling, M. Patrick Walton
Concepts For Rapid-Refresh, Global Ocean Surface Wind Measurement Evaluated Using Full-System Parametric Extrema Modeling, M. Patrick Walton
Theses and Dissertations
Satellite wind vector data is integral to atmospheric models and forecasts. Currently, the limited refresh rate of global wind vector measurement systems makes it difficult to observe diurnal variation of mesoscale processes. Using advancements in the underlying subsystem technologies, new satellite wind scatterometers may be possible that increase temporal resolution, among other performance metrics. I propose a method for parametrically modeling the extreme performance range of a complex system. I use this method to develop a model of the space of possible satellite wind scatterometer designs. I validate the model using point designs of heritage scatterometers. Finally, I present two …
Cmos Charge Amplifier For Scientific Instruments, Yixin Song
Cmos Charge Amplifier For Scientific Instruments, Yixin Song
Theses and Dissertations
Charge detection is essential for a large number of commercial and scientific applications. A charge amplifier is one of the most fundamental building blocks for a detector system. This thesis describes the design, circuit implementation, and post-silicon testing of two different charge amplifier designs, analog and digital, that address some commonly seen fundamental challenges in the charge detection application. In particular, the proposed designs can be integrated with an image charge detector (ICD) to study the characteristics of dust on Mars. The proposed charge amplifier design utilizes a small 10 fF feedback capacitor to achieve a high gain. The fully …
Ductile Design And Predicted Inelastic Response Of Steel Moment Frame Buildings For Extreme Wind Loads, Tyler Eric Giles
Ductile Design And Predicted Inelastic Response Of Steel Moment Frame Buildings For Extreme Wind Loads, Tyler Eric Giles
Theses and Dissertations
Inelastic design methods have been used in seismic design for several years and are well accepted in engineering practice. In contrast, an inelastic wind design method is yet to be developed, in part due to the inherent differences between seismic forces and wind forces. Current wind design practice follows a linear method to find a design windspeed for the location where the structure will be built. Once the design windspeed has been determined, the lateral force resisting system is designed such that it will behave elastically. This study was conducted with the hypothesis that by providing ductility at the material …
Assessment And Expansion Of Laboratory-Based Testing Of Biomass Cookstoves, Cameron M. Quist
Assessment And Expansion Of Laboratory-Based Testing Of Biomass Cookstoves, Cameron M. Quist
Theses and Dissertations
Biomass cookstoves are a significant source of various pollutants, such as CO2, CO, and particulate matter (PM). To mitigate the issues surrounding cookstoves, significant research has been undertaken on improved cookstoves (ICS). This research can be performed in a laboratory setting, in the field, or a combination of both. This work concentrates on the purely laboratory testing. Laboratory testing has both advantages and disadvantages when compared to field testing (e.g. decreased cost and increased consistency). However, field applications are variable, environments can be significantly different (for example wind and ambient temperature can be very different in the field vs. a …
Qos Performance Analysis Of Application Layer For Lte C-V2x, Real-Time V2v Communication, And Applications Of Machine Learning-Based Techniques, Ahmed Yahya Awad
Qos Performance Analysis Of Application Layer For Lte C-V2x, Real-Time V2v Communication, And Applications Of Machine Learning-Based Techniques, Ahmed Yahya Awad
Theses and Dissertations
The field of connected vehicles (CV) stands at the confluence of three evolving disciplines – the Internet of Things (IoT), emerging standards for connectivity of vehicles, and AI/machine learning. CV regarded as a true solution to reduce the number of accidents. in this work conducting a protocol performance road test and applying machine learning algorithms have been investigated. we used Universal Software Radio Peripheral (USRP) N210 devices to build ad hoc Vehicles Network based on IEEE 802.11p protocol and create an application layer using python language to build drowsiness detection system which resolve a significant safety issue nowadays. The application …
Design Validation Of A Multi-Stage Gradually Deploying Stent, Dillon J. Despain
Design Validation Of A Multi-Stage Gradually Deploying Stent, Dillon J. Despain
Theses and Dissertations
Angioplasty, or the use of rapidly deploying stents, is a common treatment for reopening narrowed vasculature often caused by atherosclerotic plaque. However, in-stent restenosis (ISR) induced by intimal hyperplasia is a common challenge to angioplasty. High impact stresses from current stent deployment processes have been linked to intimal hyperplasia; thus a stent that is gradually deployed over a longer period of time holds potential to mitigate these stresses. This work hypothesizes that resorbable polymeric links can be used as a triggering mechanism to enable repeatably controlled deployment of a compliant nitinol stent design with the eventual goal of reducing intimal …
Modeling Current And Future Windblown Utah Dust Events Using Cmaq 5.3.1, Zachary David Lawless
Modeling Current And Future Windblown Utah Dust Events Using Cmaq 5.3.1, Zachary David Lawless
Theses and Dissertations
Windblown dust events can be defined as windblown dust emitted from the Earth's surface to the atmosphere. These events have significant impact on local air quality. Predicting the location and magnitude of these events is vital for Utah air quality assessment and planning. Previous modeling studies have focused only on past dust events. This work utilized a state-of-the-science software framework based on the Community Multiscale Air Quality (CMAQ) v5.3.1 modeling system to predict dust events in Utah. The framework was verified using previous studies for dust events in April 2017 and March 2010. Once verified, the framework was used to …
Control Of Post-Weld Fracture Toughness In Friction Stir Processed X-80 Hsla Steel, Nolan Tracy Crook
Control Of Post-Weld Fracture Toughness In Friction Stir Processed X-80 Hsla Steel, Nolan Tracy Crook
Theses and Dissertations
The present study investigates the fracture toughness of FSW X-80 HSLA steel welds. Weld cooling rate and peak temperature were varied among welds; indirectly manipulated through FSW travel speed, rpm, and weld preheat. Fracture toughness was tested according to ASTM 1820 standard along the weld centerline using surface-notched SEB specimen cooled to -40 °C. This study resulted in a reliable, repeatable process for generating friction stir welds with CTOD’s consistently above that of the original base metal. CTOD and microstructure of friction stir welds can be selected by controlling weld cooling rate and peak temperature. Material properties and microstructure similar …
Use Of Vertical Electrical Impedance For Nondestructive Evaluation Of Concrete Bridge Decks, Enoch Thomas Boekweg
Use Of Vertical Electrical Impedance For Nondestructive Evaluation Of Concrete Bridge Decks, Enoch Thomas Boekweg
Theses and Dissertations
Nondestructive evaluation of civil infrastructure is increasingly important in the modern world to assess structures, predict longevity, and prescribe rehabilitation or replacement. For concrete bridge decks, one emerging diagnostic technique is vertical electrical impedance (VEI) testing, which is a nondestructive evaluation technology that quantitatively assesses the cover protection offered to steel reinforcement. Because VEI testing is still a relatively new approach to bridge deck inspection, additional studies are needed to increase the interpretability of VEI data. This thesis increases VEI interpretability with two advances. The first advance, presented in Chapter 2, offers an analytical model for interpreting VEI measurements of …
Exploration Of Constant-Force Wristbands For A Wearable Health Device, Thomas Alexander Naylor
Exploration Of Constant-Force Wristbands For A Wearable Health Device, Thomas Alexander Naylor
Theses and Dissertations
Wearable Health Devices (WHDs) are an emerging technology that enables continuous monitoring of vital signs during daily life. Issues with constant and consistent data acquisition have been found while WHD technology has developed. The force of the measurement area and movement of the sensors are key mechanical issues that need to be solved for WHDs to become a viable way to continuously monitor health conditions. This work explores Constant-Force Mechanisms (CFMs) as a solution to problems the current WHD industry faces. Additionally, the relationship between force provided from the mechanism, sensor pressure on the wrist, patient comfort, and sensor readings …