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Structural Safety Of Bridge Decks With Variable Rebar Cover, Prem Egade
Structural Safety Of Bridge Decks With Variable Rebar Cover, Prem Egade
Civil Engineering Theses
Construction defects are common and are difficult to avoid completely. This arises due to improper workmanship, inspection, drawing and specification. On bridge decks, achieving the desired cover is necessary since inadequacy can cause accelerated corrosion in steel and for the most part spalling and delamination which ultimately led to failure. Tolerance provided by different standards and specification also restrict the amount of rebar. So, construction is more focused on increasing cover undermining the loss of strength as consequence. The objective of this research is to check the safety of decks by analyzing bridges for reduction in capacity due to cover …
Rational Design And Synthesis Of Biodegradable Polyurethane Based Biomaterials, Cancan Xu
Rational Design And Synthesis Of Biodegradable Polyurethane Based Biomaterials, Cancan Xu
Bioengineering Dissertations
Biodegradable polyurethanes have been applied in biomedical field since 1960s. In recent years, biodegradable polyurethanes have been widely investigated for tissue repair and regeneration because of their good mechanical properties, elasticity, biodegradability, biocompatibility and processability. Compared with some commonly used biodegradable polymers, such as poly(glycolide) (PGA), poly(lactide) (PLA), poly(ε-caprolactone) (PCL) and polyhydroxyalkanoates (PHA), the favorable aspects of biodegradable polyurethane are its mechanical, physicochemical and biological properties can be tailored by varying the three blocks in polyurethane backbone, diisocyanate, diol and chain extender. In this thesis, we focus on the development of different functional biodegradable polyurethanes to study their structure-property relationships …
Novel Infrastructure Monitoring Using Multifaceted Unmanned Aerial Vehicle Systems - Close Range Photogrammetry (Uav - Crp) Data Analysis, Surya Sarat Chandra Congress
Novel Infrastructure Monitoring Using Multifaceted Unmanned Aerial Vehicle Systems - Close Range Photogrammetry (Uav - Crp) Data Analysis, Surya Sarat Chandra Congress
Civil Engineering Dissertations
Remote sensing is a method of collecting data without making any physical contact with the object under inspection. Modern day remote sensing kicked off with the invention of the camera and continued on to the invention of advanced satellite mounted sensors. Photogrammetry is defined as a science that measures distances using one or more images captured remotely. Remote collection of images within a range of 1000 ft is termed close-range photogrammetry (CRP). Unmanned aerial vehicle systems (UAV or UAS) have become a popular means of remotely gathering information and assessing infrastructure conditions due to their versatile nature. Multirotor and fixed-wing …
Hpfrc And Rc Slab-Beam-Column Connections Under Extreme Earthquake Loading And Further Improvement Of Novel Double-Beam-Coupling Beams, Youngjae Choi
Hpfrc And Rc Slab-Beam-Column Connections Under Extreme Earthquake Loading And Further Improvement Of Novel Double-Beam-Coupling Beams, Youngjae Choi
Civil Engineering Dissertations
The work presented in this dissertation is divided into two parts. Each part has drawn its own results. Reinforced concrete (RC) buildings resist a strong earthquake through structural foundations, diaphragms, and vertical elements. Moment-resisting frames and shear walls are primary-used vertical elements in RC buildings. The moment-resisting frames consist of columns, beams that frame into the column and beam column joints where the columns and beams meet. A key point of designing the moment-resisting frames against a strong earthquake is to ensure beam-column connections to dissipate as much energy possible. The shear wall often becomes two separate slender cantilever walls …
Development Of Particle Platforms For Delivery Of Angiogenic Reagents To Treat Peripheral Arterial Diseases, Duong Quang Le
Development Of Particle Platforms For Delivery Of Angiogenic Reagents To Treat Peripheral Arterial Diseases, Duong Quang Le
Bioengineering Dissertations
Peripheral arterial disease (PAD) is a disease that one or several peripheral arteries are narrowed or blocked. PAD is an emerging disease that cost annually 10-20 billions of US dollars for health care in America. PAD patients suffer high risk of limb loss, amputations and mortalities. At 5 years, the amputation rate for PAD is 40%-70% while the 5-year survival rate is less than 30%. For PAD patients undergoing acute and critical limb ischemia, surgery bypass and endovascular balloon/stenting are applied as standard treatments. However, surgical bypass is subject to patients’ readiness of autologous veins and the depth of arteries …
Laboratory And Field Study Of A Liquid Ionic Soil Stabilizer, Sandesh Gautam
Laboratory And Field Study Of A Liquid Ionic Soil Stabilizer, Sandesh Gautam
Civil Engineering Theses
Chemical stabilization of expansive soil has been practiced for quite a time now. The use of lime/cement stabilization as a traditional method has been well acknowledged, understood and standard guidelines for practice have been developed. However, owing to certain demerits like high production and application cost, environmental impact, durability issues and most importantly incompatibility with high-sulfate soil leading to excessive heaving and swell, there is need to develop alternatives to these stabilizers. Non-traditional stabilizers like ionic soil stabilizer have been used by manufacturers in the past and claimed to effectively reduce the swell-shrink behavior of expansive soil. Undocumented results, the …
Development Of The Urban Passenger Transportation Life Cycle Inventory For Comparison Across Modes Model (Transportlifecamm), Alma Angelica Hernandez Ruiz
Development Of The Urban Passenger Transportation Life Cycle Inventory For Comparison Across Modes Model (Transportlifecamm), Alma Angelica Hernandez Ruiz
Civil Engineering Dissertations
Against the backdrop of the increasingly complex urban passenger transportation challenges associated with megacities during the 21st century, and the effort to find the most sustainable modes of transportation for them, the spreadsheet-based model TransportLifeCAMM was developed. This model allows users in the US and Mexico to compare life cycle environmental impacts from automobile, bus, and/or subway. While other models to estimate environmental burdens from transportation exist, few of them consider emissions or energy consumption over the entire life cycle of the vehicle and the fuel (including vehicle manufacture, fuel production, maintenance, and end-of-life disposal). Furthermore, even fewer of the …
Study Of Conduction Behavior In Dielectrics In Chip Level Interconnects: Detection Of Defects In Al/Sio2 Interconnects, Po-Cheng Lu
Material Science and Engineering Dissertations
This dissertation presents four different electrical measurement techniques to detect structural defects in Al/SiO2 interconnects. These techniques, namely 1) polarity dependence measurement, 2) current voltage measurement, 3) two-point measurement and 4) discharge transient current measurement, can provide simple electrical parameters having direct relationship to defects state (type and quantity) in interconnect structure. All these measurement techniques use the MIM (metal-insulator-metal) structure such as the comb-serpentine structure commonly existing in integrated (IC) devices. This study also presents a newly discovered dielectric failure mechanism, that is the failure by a process of partial discharge dielectric breakdown phenomenon. The goal of the charging …
Process Calibration For Elastically Scaled 3d Printed Models Using Fused Deposition Modeling, Edgar Bernardo Mares
Process Calibration For Elastically Scaled 3d Printed Models Using Fused Deposition Modeling, Edgar Bernardo Mares
Mechanical and Aerospace Engineering Theses
With the increase in additive manufacturing capabilities the use of 3D printed models characterize a critical point for evaluating aerodynamic and aeroelastic properties on aircraft configuration. An experimental and computational approach beginning with elastically scaled 3D printed models enables for a case to be defined, developed, and extracted to match aeroelastic test behavior. The basis of this work is supported by aeroelastic tailoring and scaling methods in the application of 3D printed models. To accomplish this, stiffened 3D printed plates are scaled from elastically scaled 3D printed models for stiffness through geometric configurations, different build orientations, and bead thickness as …
Sensor Tasking For Satellite Tracking Utilizing Observability Measures, Mitchel T. Mcdonald
Sensor Tasking For Satellite Tracking Utilizing Observability Measures, Mitchel T. Mcdonald
Mechanical and Aerospace Engineering Theses
In this thesis, novel observability-measure based sensor tasking methods are studied for satellite tracking applications. The tasking is performed by first computing the Hellinger Distance between ground/space based sensors and space objects, and then the measure is utilized for selecting the sensors that maximize observability. Several other measures such as the Fisher Information Gain, Largest Lyapunov Exponent, and Shannon Information Gain have also been utilized and the performance of these measures are computed against each other. The object's state estimates are obtained using nonlinear estimation techniques. The Extended Kalman Filter, Unscented Kalman Filter, and Bootstrap Particle Filter are compared within …
Inducing Vibro-Tactile Sensation At Mesoscale, Sudip Hazra
Inducing Vibro-Tactile Sensation At Mesoscale, Sudip Hazra
Mechanical and Aerospace Engineering Theses
Haptics, the feeling of touch, has primarily been used to provide a person a general sensation such as vibration using a joystick or cellphone. But haptics has gradually developed to a stage where it is investigated for virtual and augmented reality environments. Vibro-tactile based feedback is a modality employed to provide a more realistic and localized sensation. This research focuses primarily on providing vibro-tactile feedback at the mesoscale level on the fingertips. A research platform for mesoscale vibro-tactile feedback has been investigated and developed. The software is based on LabVIEW and could generate a number of different and distinct waveform …
Observation Of The Interaction Between A Transonic Shock Wave And A Wingtip Vortex||, Troy T. Bushmire
Observation Of The Interaction Between A Transonic Shock Wave And A Wingtip Vortex||, Troy T. Bushmire
Mechanical and Aerospace Engineering Theses
The present study observes the interaction between two fundamental phenomena in fluid mechanics: the transonic shock wave and the wingtip vortex. While these are two areas of fluid mechanics in which extensive experimental and numerical research has been conducted, there is little information on the interaction between the two. The present study numerically simulates a wing with a NACA-0012 section at Mach 0.758 and observes the interaction between the transonic shock wave and wingtip vortex for various angles of attack. The focus of the study is on the surface flow topology and the flow exterior to the boundary layer. Results …
Enhancing Tensile Strength Of Fdm Parts Using Thermal Annealing And Uniaxial Pressure, Rhugdhrivya Rane
Enhancing Tensile Strength Of Fdm Parts Using Thermal Annealing And Uniaxial Pressure, Rhugdhrivya Rane
Mechanical and Aerospace Engineering Theses
Additive manufacturing has been a revolutionary and disruptive technological development in the field of design and manufacturing with Fused deposition modelling (FDM) being at the forefront of this technology. But it is seen that parts printed using FDM suffer from an inherent deficiency of weak tensile strength in the out of plane direction (z-direction) thus limiting their application. This issue of weak z-direction strength is due to the weak Inter-bead bond strength of adjacent polymer interfaces. The purpose of this work is to increase this Inter-Bead bond strength thus increasing the overall tensile strength of the part. In this work, …
Thermodynamic And Phase-Field Analysis Of Domain Structures And Switching Kinetics Of Bismuth Ferrite Thin Films, Ryan T. Hart
Thermodynamic And Phase-Field Analysis Of Domain Structures And Switching Kinetics Of Bismuth Ferrite Thin Films, Ryan T. Hart
Material Science and Engineering Theses
In this study, thermodynamic analysis and phase field simulation are utilized to study the polarization, phase transitions, and phase coexistence in BFO thin films. The effect of temperature, substrate strain, and electrical bias on the phase stability and the phase transformation pathways were studied. Existing thermodynamic analysis methods are supplemented by a phase destrain model, which determines free energy minima as a function of biaxial strain and the fractions of BFO’s ferroelectric phases in a thin film. The results of this methodology are compared with phase field modeling. The phase de-strain model shows reasonable accuracy in determining boundaries at which …
Energy Harvesting Device Using Ferrofluids Slugs In Microchannels, Omkar Amar Pawar
Energy Harvesting Device Using Ferrofluids Slugs In Microchannels, Omkar Amar Pawar
Mechanical and Aerospace Engineering Theses
This research proposes a new concept of energy harvesting with the help of oscillating slugs of ferrofluid in microchannels. Ferrofluids are colloidal suspension of paramagnetic nanoparticles which get magnetized in the presence of magnetic field. They can conform to any shape and can be injected easily in intricate spaces. A change in the magnetic flux through the solenoid area produces electromotive force per Faraday’s law. To prove the concept of harvesting energy by having a change in magnetic flux with the help of ferrofluids, several ferrofluid slugs were made to pass through a multi turn solenoid wound around a glass …
An Analytical Design Of Experiments Method For Fatigue Constrained Design Optimization Of A 3d Printed Structure, Ashish Pokharel
An Analytical Design Of Experiments Method For Fatigue Constrained Design Optimization Of A 3d Printed Structure, Ashish Pokharel
Mechanical and Aerospace Engineering Theses
A design of experiments approach has been used to analytically determine a low cycle fatigue (LCF) constraint for use in design optimization of 3D printed structures. In context of metal additive manufacturing, the process of melting, solidification and consolidation of metal powder introduces very high temperature gradient field within the build which in turn results in high compressive stresses at the core and tensile stresses at the outer surface of the part after it has cooled down to room temperature post build. An approach of finite element modeling in ANSYS Additive has been used to develop a residual stress profile …
Underdamped Motion Of A Microbead In Optical Tweezer And Its Relationship With The Reynolds Number, Vatsal Asitkumar Joshi
Underdamped Motion Of A Microbead In Optical Tweezer And Its Relationship With The Reynolds Number, Vatsal Asitkumar Joshi
Mechanical and Aerospace Engineering Theses
Optical tweezers can hold and manipulate microscopic objects with the use of a highly focused laser beam. The radiation pressure acting on the object is generally in the range of piconewtons and can be attractive or repulsive based on the reflective indexes of the object and the surrounding medium. Though the advances in the field of Optical tweezers have been enormous in the past few years, only the object's planer motion can be analyzed with the motion capture technology available today. Due to the wide applications of Optical tweezers in the field of biology and physics, the ability to simulate …
Design And Development Of Flexible Mems-Based Ph Sensor For Agricultural And Biomedical Applications, Shardul Sonu Pawar
Design And Development Of Flexible Mems-Based Ph Sensor For Agricultural And Biomedical Applications, Shardul Sonu Pawar
Mechanical and Aerospace Engineering Theses
The purpose of this study is to demonstrate a novel method of using a flexible MEMS-based pH sensor for agricultural and biomedical applications. The first part of the thesis involves demonstration of the capability of our pH sensor for monitoring pH level change in the food product. The pH sensor we have developed consists of Iridium Oxide (IrOx) and Silver Chloride (AgCl) sensing electrodes. The sensor is designed to monitor and sustain long-term continuous usage, which makes it suitable for a wide variety of agricultural based applications. The electrochemical potential generated between IrOx and AgCl electrode is monitored and further …
Reachable Set Computation And Analysis For Perturbed Linear Systems, Prabhjeet Singh Arora
Reachable Set Computation And Analysis For Perturbed Linear Systems, Prabhjeet Singh Arora
Mechanical and Aerospace Engineering Theses
Determination of the set of all possible states, which a system can attain, plays an important role in safety for critical application. Prior knowledge of this set for the complete run-time provides critical information about how a system may evolve, providing accurate information of all the states, which could violate constraints. The knowledge of these states, helps in estimating control input, which can control the system, such that, these states are eliminated from the reachable set. Computation of reachable set of a dynamic system for a set of initial conditions can be easily performed, provided the analytical solution of the …
A Cmos Switched Capacitor Filter Based Potentiometric Readout Circuit For Chemfet Sensor, Revathy Perumalsamy
A Cmos Switched Capacitor Filter Based Potentiometric Readout Circuit For Chemfet Sensor, Revathy Perumalsamy
Electrical Engineering Theses
There are wide ranges of potentiometric sensors available for chemical sensing. The latest implementation of these sensors is CHEM resistors. In real time environment for an in-vivo application area, noise and power are the important factors. Though the selectivity of CHEM resistors improved with recent technological developments analog front end measurement circuits are always the limiting factor. Without compromising the performance parameters like gain and op-swing it is a challenge to improve the noise and power. Noise and power are the two factors which always require improvement. Also, there is trade-off between noise and power which needs to be balanced. …
Sub-Synchronous Control Interaction – Modeling And Detection, Farshid Salehi
Sub-Synchronous Control Interaction – Modeling And Detection, Farshid Salehi
Electrical Engineering Dissertations
Power systems have recently become more susceptible to Sub-Synchronous Control Interaction (SSCI) due to the increasing penetration of renewable generation resources and series compensated lines. Any contingency which results in a radial condition between renewable generation resources and near-by series compensated lines might trigger an undamped SSCI oscillation. This is a purely electrical phenomenon which has potential to grow rapidly. Undamped SSCI oscillation can cause serious damage to the renewable generation resources and transmission elements and consequently leads to cascading outages. Due to the importance of the phenomena and its potential impacts, this research has focused on two aspects of …
A Parametric Process-Based Cost Estimation Framework To Support Conceptual Product Family Design And Production, Zahra Banakar
A Parametric Process-Based Cost Estimation Framework To Support Conceptual Product Family Design And Production, Zahra Banakar
Industrial, Manufacturing, and Systems Engineering Dissertations
In today’s globally competitive environment, production costs estimation is a challenging task. This competitive market has brought specific strategies in the manufacturing sector, such as introducing more new products into the market with lower prices. In order to have the most accurate production costs estimation, accurate production cost information in a useful and relevant form is needed. This study presents a cost estimation framework that integrates both activity and parametric cost estimation methods to increase the ease, accuracy, and speed of producing cost estimates for a family of products or services. There is a need for an integrated production cost …
Field Swcc Modeling And Soil Water Storage Evaluation Through Geophysical Testing, Linkan Sarker
Field Swcc Modeling And Soil Water Storage Evaluation Through Geophysical Testing, Linkan Sarker
Civil Engineering Theses
Evapotranspiration (ET) landfill cover is an emerging final cover system and offers several benefits over conventional landfill closure system. It is a cost-effective green solution for the sustainability of a landfill as its performance enhances with time compared to the conventional solution where low hydraulic conductivity soil barrier deteriorates with time. ET cover system relies on the water store-release principle and its performance depends on the site-specific factors such as on-site climatological conditions, soil hydraulic properties and native vegetation. To effectively monitor the performance of this type of cover system, its unsaturated behavior, field capacity, available moisture for plant growth, …
Data Science Applications In Health An Social Care, Maryuri Ariela Quintero
Data Science Applications In Health An Social Care, Maryuri Ariela Quintero
Industrial, Manufacturing, and Systems Theses
Health and social care are areas of concern worldwide nowadays. Chronic diseases such as cancer and social problems such as tobacco consumption are leading risks of deaths in many countries, and preventive efforts are urgently needed to decrease the negative impact that those problems cause. Technology has made available an unprecedent amount of data in the health and social care fields, which scientists are using to achieve a better understanding of many problems that are a burden for the health and social systems globally. Although previous studies have provided approaches to analyze data, more efficient and accurate methods are needed …
Deep Learning Based Fast Mode Decision In Hevc Intra Prediction Using Region Wise Feature Classification, Shiba Prasad Kuanar
Deep Learning Based Fast Mode Decision In Hevc Intra Prediction Using Region Wise Feature Classification, Shiba Prasad Kuanar
Electrical Engineering Dissertations
The High Efficiency Video Coding (HEVC) standard has achieved best coding efficiency as compared to previous H.264/AVC standard. But the computational time of HEVC encoder has increased mainly because of the hierarchical quad-tree based structure, recursive search for finding the best coding units, and the exhaustive prediction search up-to 35 modes. These advances improve the coding efficiency, but result into a very high computational complexity. Furthermore selecting the optimal modes among all prediction modes are necessary for the subsequent rate distortion optimization process.Therefore we propose a convolutional neural network (CNN) based algorithm which learns the region wise image features and …
Performance Modeling And Experimental Investigations Of Rotating Detonation Engines, Andrew Ryan Mizener
Performance Modeling And Experimental Investigations Of Rotating Detonation Engines, Andrew Ryan Mizener
Mechanical and Aerospace Engineering Dissertations
The rotating detonation engine (RDE) is a promising propulsion concept that has the potential to offer increased thermodynamic performance in a compact package with no moving parts. A series of analytical and experimental investigations was carried out on RDEs with the joint goal of investigating swirl, torque, and a range of other design parameters of interest. The model and experimental facility were then applied to related problems with the goal of advancing the understanding of RDE applications. A flexible, low-order, semi-empirical model for a rotating detonation engine was presented. The model was formulated to be able to run broad parametric …
Foil Thrust Bearing With Pocket Grooves And Tailored Bump Stiffness Distribution For Improved Static Performance, Nguyen Thao Latray
Foil Thrust Bearing With Pocket Grooves And Tailored Bump Stiffness Distribution For Improved Static Performance, Nguyen Thao Latray
Mechanical and Aerospace Engineering Dissertations
Gas foil thrust bearing is one of few axial bearing options for high speed turbomachinery systems. Its advantages include low cost, light weight, generous allowance for component mis-alignment and runout. However, the bearing has low load carrying capacity comparing to other types such as rigid gas bearing and magnetic bearing. This work explores two non-traditional design aspects to improve gas foil thrust bearing’s static performance. The bearing bump foil is redesigned to tailor to the bearing pressure profile; hence induces a more uniform gas film thickness. Simulation using independent elastic foundation model predicts the new tailored bump foil thrust bearing …
Direct Numerical Simulation Of Homogeneous Isotropic Turbulence - A Methodology And Applications, Sarah Moussa Hussein
Direct Numerical Simulation Of Homogeneous Isotropic Turbulence - A Methodology And Applications, Sarah Moussa Hussein
Mechanical and Aerospace Engineering Dissertations
Turbulence has been a topic of scientific research for years. Characterized by unorganized chaotic motion and irregular fluctuations, it persists as one of the most challenging topics in fluid mechanics despite volumes of documented research and crucial findings. This begs the question: What is turbulence and why is it so challenging? Turbulence research studies cover a wide spectrum of branches from fundamental flow propagation to different turbulence interactions. This research project investigates the simplest class of turbulent flow studies, homogeneous isotropic turbulence. In a quest to advance the fundamental understanding of turbulence physics, a direct numerical simulation tool is developed. …
Methane Oxidation Potential Of Uncomposted Yard Waste As A Landfill Biocover, Gomathy Radhakrishna Iyer
Methane Oxidation Potential Of Uncomposted Yard Waste As A Landfill Biocover, Gomathy Radhakrishna Iyer
Civil Engineering Dissertations
Biocovers are widely used in landfills to oxidize emissions of the greenhouse gas methane. Biocovers used till date are fully or partially made of composts. Compost takes time and effort to create, and costs about $10 per cubic yard on an average. Even more importantly, however, production of compost, although theoretically an aerobic process, actually generates methane, from 3.2 to 362 kg CO2-equivalents per ton of wet waste composted, depending on the type of waste, whether open or enclosed composting technology is used, and other factors. To reduce the net greenhouse gas emissions from biocovers, this research explores the potential …
Utilization Of Geocell-Reinforced Rap Material Base Layer In Flexible Pavements: Experimental And Numerical Studies, Anu Muthumala George
Utilization Of Geocell-Reinforced Rap Material Base Layer In Flexible Pavements: Experimental And Numerical Studies, Anu Muthumala George
Civil Engineering Dissertations
Reclaimed asphalt pavement (RAP) materials have been considered as one of the most sustainable and cost-effective options in the pavement industry. The use of RAP materials in pavement construction reduces natural resources depletion and the volume of construction debris discarded into the landfills. However, the low shear strength and high permanent deformation (PD) of RAP materials often limit their application in road bases. Utilization of mechanical stabilizers, such as geocell, for stabilizing RAP bases, have found to be effective in improving the pavement performance. The main objective of this study is to assess the efficacy of high-density polyethylene (HDPE) geocell …