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Articles 2671 - 2700 of 2904
Full-Text Articles in Engineering
Synthesis And Characterization Of Multifunctional Oxides For Force And Gas Sensors, Vaneet Sharma
Synthesis And Characterization Of Multifunctional Oxides For Force And Gas Sensors, Vaneet Sharma
Material Science and Engineering Theses - Archive
In this research work, the piezoresistivity phenomena in multifunctional oxides of La0.8Sr0.2MnO3 (LSMO) and composites of LSMO - (Ce0.12Zr0.88)O2 has been investigated for force and gas sensor applications in harsh environments including automobile and aerospace industry. In these applications, there is a need of material with high mechanical strength with multi sensing capabilities. The inherent sensing capabilities allow the material to be implemented at variety of platforms. Previously, LSMO polycrystalline ceramics have been studied as a cathode material in solid oxide fuel cells (SOFC). Owing to its colossal magnetoresistance properties, this material has also been extensively studied for use in …
Branch-And-Cut-And-Price Methods For Logistics Problems With Limited Risk, Hee-Su Hwang
Branch-And-Cut-And-Price Methods For Logistics Problems With Limited Risk, Hee-Su Hwang
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
There exist many uncertainties in a logistics system, such as unknown demand, unsteady fuel cost, machine breakdowns, and accidents to name a few. Logistics management is difficult because logistics managers must solve a global optimization problem, which includes eliminating as much uncertainty as possible, finding effective methods of managing uncertainty, and operating the entire logistics system effectively. To cope with uncertainty, many efforts have been made for vehicle routing problems. On the contrary, traditional ship-scheduling models ignore uncertainty, even in highly volatile markets. We present a set-packing model that limits risk using a quadratic variance constraint. After generating first-order linear …
Fiber Based Non-Linear Excitation Fluorescence Microscopy, Priyanka Amrita Jillella
Fiber Based Non-Linear Excitation Fluorescence Microscopy, Priyanka Amrita Jillella
Bioengineering Theses - Archive
Non-linear excitation fluorescence microscopy is a high resolution, non-invasive biological imaging technique capable of imaging both in vitro and in vivo at the depths of several hundred microns. The goal of the thesis work is to contribute towards a fiber based non-linear excitation fluorescence microscopy system that we plan to build for our lab, which would later on be integrated with the OCT imaging setup and the DIC microscope. This thesis work involves filling in the key components in the microscopy system. These key components are; femtosecond pulse diagnosis, study of dispersion in optical media, dispersion free femtosecond pulse delivery …
An Analytical Performance Management Framework Enabiling Enterprise Strategy Management, Amr Abu-Suleiman
An Analytical Performance Management Framework Enabiling Enterprise Strategy Management, Amr Abu-Suleiman
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
Performance management has gained noticeable interest from both researchers and executive in the past two decades. Financial measures are no longer a primary emphasis for researchers and executives. One of the most popular performance management methodologies is the Balanced Scorecard. The Balanced Scorecard framework facilitates translating strategy into objectives and initiatives across four perspectives. These perspectives are financial, customer, internal processes, and learning and growth. The second component of the balanced scorecard is strategy maps. Strategy maps outline the cause and effect between the four perspectives, and illustrate the value creation process through transforming leading indicators (operational measures) into lagging …
The Development Of A Design Ontology For Products And Processes, Md Baniamin Sarder
The Development Of A Design Ontology For Products And Processes, Md Baniamin Sarder
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
This research develops a methodology called, Design Knowledge Acquisition Process (DKAP) for creating ontology of product and process design using IDEF5 and to develop a consistency matrix for checking accuracy of captured information. It constructs an ontology of a generic product and process design using the developed DKAP methodology. Designing products and processes is very challenging and vital for manufacturing enterprises to stay in the competitive market. Manufacturers want to launch their products in the market as quickly as possible while satisfying their customers in terms of quality, cost and delivery. In order to lunch the products early and/or to …
Convex Versions Of Multivariate Adaptive Regression Splines And Implementations For Complex Optimization Problems, Dachuan Thomas Shih
Convex Versions Of Multivariate Adaptive Regression Splines And Implementations For Complex Optimization Problems, Dachuan Thomas Shih
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
Multivariate Adaptive Regression Splines (MARS) provide a flexible statistical modeling method that employs forward and backward search algorithms to identify the combination of basis functions that best fits the data. In optimization, MARS has been used successfully to estimate the value function in stochastic dynamic programming, and MARS could be potentially useful in many real world optimization problems where objective (or other) functions need to be estimated from data, such as in simulation optimization. Many optimization methods depend on convexity, but a nonconvex MARS approximation is inherently possible because interaction terms are products of univariate terms. In this dissertation, convex …
A Methodology For Evaluating The Performance Of Reverse Supply Chains In Consumer Electronics Industry, Srikanth Sastry Yellepeddi
A Methodology For Evaluating The Performance Of Reverse Supply Chains In Consumer Electronics Industry, Srikanth Sastry Yellepeddi
Industrial, Manufacturing, and Systems Engineering Dissertations - Archive
Enterprises around the world are employing reverse supply chain practices to generate profit making opportunities while meeting new regulations. As a result of the rapid progress in technology the product lifecycles are shrinking faster than ever. In the face of global competition, heightened environmental regulations and a wealth of additional profits and improved corporate image opportunities, performing the reverse supply chain operations at a world class level is becoming quintessential. These factors in addition to the inherent complexity of reverse supply chains due to the uncertainties associated with the quantity, quality, and timing of returns make returns management very complicated. …
Applications Of Ultra Wideband, Liang-An Wei
Applications Of Ultra Wideband, Liang-An Wei
Electrical Engineering Theses - Archive
Ultra wideband (UWB) is a new wireless communication system. It utilizes transmission signal at wide bandwidths. With wider bandwidth, it can provide for new useful applications. The first chapter in this thesis discusses the features and advantages of the UWB. Chapters 2 and 3 present two proposed UWB applications. Chapter 2 presents the use of UWB in shipping containers. The security of shipping containers is an urgent issue for globally. UWB can provide a solution to secure containers. Our goal is to develop a system to enhance the transmission signals. In comparison with other system designs, our waveguide approach satisfies …
Simulation And E-Beam Patterning Of Single Electron Transistor, Karan Deep
Simulation And E-Beam Patterning Of Single Electron Transistor, Karan Deep
Electrical Engineering Theses - Archive
Electron beam lithography is gaining widespread use as semiconductor industry. Current optical lithography techniques are limited to resolution of few hundreds of nanometers and suffer from diffraction problems. The focus of this thesis is to pattern single electron transistors (SET) using electron beam lithography on silicon and silicon on insulator (SOI) substrate which can be further processed to form working SET device. We used different types of e-beam resists like UVN 30, PMMA and HSQ to define source, drain and island for SET. We demonstrated the use of RIE and Deep RIE to etch silicon by using resist as etch …
Thermal Enhancement Of Stacked Dies Using Thermal Vias, Baekyoung Sung
Thermal Enhancement Of Stacked Dies Using Thermal Vias, Baekyoung Sung
Mechanical and Aerospace Engineering Theses - Archive
Following Moore's law, the number of transistors on a die continues to rise and has recently exceeded a billion on high end processors. In light of the convergence of technology, power requirements is becoming a serious concern even on low density interconnect systems such as cellular phones and personal digital assistants. Also, in order to minimize foot prints, the recent trend in packaging is stacking. The stacking, however, creates challenges in cooling and especially if one is to include logic in the stack. The primary heat flow path for stacking is through the substrate and as the number of stacks …
Phase Locked Loop For Radiation Hardened Environment, Jer-Fu Dennis Wu
Phase Locked Loop For Radiation Hardened Environment, Jer-Fu Dennis Wu
Electrical Engineering Theses - Archive
This thesis describes a Phase Locked Loop (PLL) design for operation within a radiation environment. Specific design architecture and techniques were implemented to help mitigate radiation effects that degrade PLL performance. This thesis presents several elements of a rad-hard PLL that were developed to solve this challenge, such as a very wideband coupling coefficient LC VCO that has a much higher frequency tuning range than conventional varactor based LC VCOs. The PLL consists a Phase and Frequency Detector (PFD), a rail to rail charge pump, a loop filter, the quadrature LC tank Voltage Controlled Oscillator (VCO), a Current Mode Logic …
Models And Algorithms To Determine Cerebral Activation Using Near Infrared Spectroscopy, Monica Suresh Allen
Models And Algorithms To Determine Cerebral Activation Using Near Infrared Spectroscopy, Monica Suresh Allen
Electrical Engineering Dissertations - Archive
The specific aims of this dissertation were to develop: (1) Correlations between experimental protocols and oxygenated, deoxygenated, and total hemoglobin concentrations in the brain (2) Mathematical models to associate blood flow and oxygen consumption rate of the activated brain regions with measured hemodynamic changes (3) A phantom that models brain vasculature compliance to validate developed mathematical models in a controlled setup. The primary imaging modality used in the experimentation phase of this research was near infrared spectroscopy. Previously published multimodality measurements were also used to validate the mathematical models. The single compartment Windkessel model was extended to describe flow-volume dynamics …
Expressions For Bond Stress Of A Tension Splice In Steel Reinforced Concrete, Jkumar Gopalarathnam
Expressions For Bond Stress Of A Tension Splice In Steel Reinforced Concrete, Jkumar Gopalarathnam
Civil Engineering Theses - Archive
The aim of the research is to develop expressions for the bond stress at a tension splice in reinforced concrete. Many experiments have been conducted inorder to ascertain the relationship between appropriate variables and develop an expression to evaluate the bond stress. The scope of this research is to use existing experimental data to establish a relation and develop an expression. Before the preprocessing begins, the data are organized into different categories such as bottom, top and side bars, and bars with transverse reinforcement. The existing experimental data is evaluated for statistical validation. It is then subjected to individual and …
Monitoring And Fault Diagnosis Of Multiconverter Power Electronic Systems, Ranjit Jayabalan
Monitoring And Fault Diagnosis Of Multiconverter Power Electronic Systems, Ranjit Jayabalan
Electrical Engineering Dissertations - Archive
Over the recent years the electric loads in automobiles have increased considerably due to advancements in high-power semiconductor based converters. However, with increasing electrical and electrically driven loads, there have been increasing concerns on system reliability. Faults occurring in such application specific solid state converters can lead to fatal consequences as compared to their mechanical counter parts. Thus, it is vital to identify faults in such systems to develop necessary safety techniques and methodologies. Detailed analysis of faults processes has indicated the need to act quickly following a device failure to prevent propagation of faults that may lead to catastrophic …
Self-Assembly Of Nanoparticles In Photonic Crystal Cavities For Optoelectronic Devices, Geetha Thiruvengadam
Self-Assembly Of Nanoparticles In Photonic Crystal Cavities For Optoelectronic Devices, Geetha Thiruvengadam
Material Science and Engineering Theses - Archive
Photonic crystals (PhC) offer many advantages in optoelectronics field. The focus of this thesis is to investigate a self assembly process for the formation of thin film based one-dimensional PhC and the integration of nanoparticles with two-dimensional PhC. Nanoparticles like SiO2, TiO2, PolyStyrene, and PbSe (with different surface properties) were subjected to different experiments. Various techniques, such as spin coating, immersion technique, evaporation induced assembly technique, have been carried out by varying parameters like time, temperature, position of the substrate, etc.,. An optimized method for the fabrication of 1D PhC was found to be evaporation induced Self-Assembly method by varying …
Uncertainty Characterization Of Orbital Debris, Jolanta Matusewicz
Uncertainty Characterization Of Orbital Debris, Jolanta Matusewicz
Mechanical and Aerospace Engineering Theses - Archive
The increase of orbital debris in the low Earth orbit is a concern for the space industry. Spacecraft and satellites are at risk of collision with orbital debris. Collisions can damage sensitive components or result in catastrophic failure. Organizations such as the United States Space Command are responsible for tracking orbital debris using ground based sensor sites located around the world. Orbit determination techniques are used to estimate the position and velocity of the orbit using range, azimuth, and elevation measurements obtained from the sensors. Nine sensors from the Space Surveillance Network are simulated to track a debris object in …
Analysis And Design Of A Piezoelectric Micro-Actuator, Po-Shiun Chen
Analysis And Design Of A Piezoelectric Micro-Actuator, Po-Shiun Chen
Mechanical and Aerospace Engineering Theses - Archive
Micro-grippers are usually fabricated of silicon using traditional semiconductor manufacturing processes and actuated based on thermal energy input causing their temperature to substantially increase and render unsuitable for certain applications such as biological tissue handling. In this research work, the design of a micro-gripper using piezoelectric ceramics (PZT) is presented as an alternative to silicon based micro gripper. The design procedure utilized ANSYS, a Finite Element Method based software tool to verify simple PZT models and subsequently evaluate the stroke for a family of configurations. The configurations were further explored and optimized considering that the fabrication would be performed using …
Mems Packaging: Fluxless Soldering And Reliability Assessment, Amit L. Patil
Mems Packaging: Fluxless Soldering And Reliability Assessment, Amit L. Patil
Mechanical and Aerospace Engineering Theses - Archive
This thesis presents process development and reliability assessment of the fluxless packaging of the MEMS devices. This packaging consists of metallized Kovar package with side wall of same material and circular holes for the optical fiber interconnect between the microstructures on the chip and the macro-environment. The back of the MEMS chip and the soldering part of the optical fiber is metallized. A thin solder perform is placed between the chip and the metallized package to attach the chip and a circular solder perform is used to attach the fiber to the metal substrate. The soldering process is fluxless hence …
Spacecraft Formation Flight: Analysis Of The Perturbed J2-Modified Hill-Clohessy-Wiltshire Equations, Jeffery Scott Ginn
Spacecraft Formation Flight: Analysis Of The Perturbed J2-Modified Hill-Clohessy-Wiltshire Equations, Jeffery Scott Ginn
Mechanical and Aerospace Engineering Theses - Archive
With the recent technological gains made in satellite design and manufacturing, there has been great interest in utilizing a cluster of satellites to perform the same tasks performed by larger satellites. Historically, this has been done utilizing the Clohessy-Wiltshire equations, or the Hill's equations, as a benchmark for understanding the physics of the relative motion between two spacecraft. A variety of different models have been derived and implemented to study the relative motion dynamics since the Hill-Clohessy-Wiltshire (HCW) equations. Some of these models, like the HCW equations, are linearized and have analytical solutions. These models make the underlying physics due …
Effect Of Crac Location On A Fixed Rack Layout Of A Data Center, Vishwas Bedekar
Effect Of Crac Location On A Fixed Rack Layout Of A Data Center, Vishwas Bedekar
Mechanical and Aerospace Engineering Theses - Archive
Microprocessor driven escalation of thermal management needs has resulted in significant cooling challenges at the data center facility level, which can house thousands and tens of thousands of heat producing processors. Raised floor air ducting is the most common configuration, where chilled air from the air conditioning units is forced into the room via a under floor plenum and through perforated tiles on the floor. The hot air from the racks finds its way to the top of the air conditioning units and is then cooled and blown into the under floor plenum. The temperature at inlet of the racks …
Preparation And Characterization Of Doped Zinc Oxide, Yogeeswaran Ganesan
Preparation And Characterization Of Doped Zinc Oxide, Yogeeswaran Ganesan
Material Science and Engineering Theses - Archive
Cathodic electrodeposition was used to prepare thin films of ZnO doped with Cd, from oxygenated KCl electrolyte containing ZnCl2 and CdCl2 in various molar ratios ranging from 0 mM to 5.0 mM each. Evidence for doping was obtained from X-ray powder diffraction, diffuse reflectance, chronopotentiometry, and X-ray photoelectron spectroscopy data. The Cd-doped ZnO samples showed a superior photoresponse relative to undoped ZnO. Cadmium- and indium-doped ZnO were prepared by combustion synthesis using CdCl2 and InCl3 as dopant precursors along with zinc nitrate and urea as the combustion mixture. The doped samples were compared and contrasted with undoped ZnO using scanning …
Characterization Of Cemented And Fiber-Reinforced Rap Aggregate Materials For Base/ Sub-Base Applications, Carlos A. Ordonez
Characterization Of Cemented And Fiber-Reinforced Rap Aggregate Materials For Base/ Sub-Base Applications, Carlos A. Ordonez
Civil Engineering Theses - Archive
The engineering product known as RAP is a bonded base and sub-base material produced by the process of blending crushed recycled construction and demolition waste and debris to specified gradation requirements, and by bonding these with a fine silica Portland cement matrix at optimum moisture for compaction density. RAP has a great potential as an economically, environmentally, and structurally sound alternative to non-bonded materials conventionally used for base/sub-base applications in pavement engineering. The present work is aimed at thoroughly testing the engineering properties of RAP product in order to assess its suitability as a structurally sound and environmentally safe material, …
Flow Rate Measurement Of In Situ Perfusion Through The Aqueous Humor Outflow Network, Noel Ortiz Lawrence
Flow Rate Measurement Of In Situ Perfusion Through The Aqueous Humor Outflow Network, Noel Ortiz Lawrence
Bioengineering Theses - Archive
A system was developed to measure the instantaneous perfusate flow rate through the aqueous humor outflow network of a human eye, while under constant pressure. The system monitors real-time weight changes of a perfusate reservoir associated with perfusate flow through the aqueous humor outflow network. The recorded weight changes of the reservoir are used as an indicator of flow rates. Methods to determine time and flow rate resolution and to control for evaporation were also developed. The system is capable of measuring flow on a uL/min scale; determined by the following model, which also includes a range of uncertainty (implies …
Detection Of Sleep Disordered Breathing Using Electroencephalography, Priya Xavier
Detection Of Sleep Disordered Breathing Using Electroencephalography, Priya Xavier
Bioengineering Theses - Archive
This study investigates the application of Electroencephalography (EEG) to detect Sleep disordered breathing (SDB) using power spectral analysis. A preliminary study was performed on 13 subjects (ages: 49.08 ± 8.82) previously diagnosed with OSA. Power spectral analysis was performed and centered on apnea/hypopnea event terminations. The normalized power changes between the frequency bands delta, theta, alpha and sigma were calculated using the Welch Averaging Periodogram method between 10 s of EEG data before the event termination and 10 s of EEG data after event termination. A significant decrease in normalized delta power and a significant increase in normalized theta, alpha …
Assessment Of Soil-Water Retention Properties Of Lime And Cement Treated Clays, Harshavardhan Reddy Thudi
Assessment Of Soil-Water Retention Properties Of Lime And Cement Treated Clays, Harshavardhan Reddy Thudi
Civil Engineering Theses - Archive
The soil-water characteristic curve (SWCC) of unsaturated soils has considerable importance in the analysis of geotechnical engineering problems involving soils that remain under partially saturated conditions throughout any given year. The SWCC reflects the behavior of unsaturated soils with regard to its hydraulic conductivity, shear strength, and volume change behavior. Numerous investigations have been undertaken in recent decades to extend the unsaturated soil mechanics principles into conventional engineering practice. The soil-water characteristic curve (SWCC) has become a widely used experimental means for assessing fundamental properties of unsaturated soils for a wide range of suction values. However, a limited number of …
Optimization Of Hydrogen Filling Station, Vishal Bhan
Optimization Of Hydrogen Filling Station, Vishal Bhan
Electrical Engineering Theses - Archive
After experiencing the price hikes in the fuel and electricity, renewable energy is considered as one of the most attractive alternatives for future utility industry. Also, Hydrogen via renewable energy is of interest due to the environmental concern when compared with traditional fossil fuels. The Energy Bill of 2005 has included an authorization of $3.7 billion for hydrogen and fuel cell research and development. Further, hydrogen fuel cell vehicles (FCVs) are currently in the pre-production stage of development and the infrastructure needs to support them. Hence to overcome issues like price hike, exhaustion of crude oil and to gain appreciation …
Emulation Of Asic Based Network Processor On A Fpga Platform, Sharada Vajja
Emulation Of Asic Based Network Processor On A Fpga Platform, Sharada Vajja
Electrical Engineering Theses - Archive
ABSTRACT Exponential increase of device sizes and complexity of ASICs mandate the need for design verification to meet timing specifications and functionality requirements. Verification techniques are broadly implemented in three categories viz., simulation, verification using commercial emulators and FPGA based prototyping. An Intel architecture based network processor, to be taped out in the near future, is being emulated on FPGA based platform. The basic blocks of the Network Processor, for instance, the Memory Controller Hub and I/O controller Hub were synthesized to be configured on FPGAs. The work involved synthesizing the design, partitioning it on multiple FPGAs and pin multiplexing …
Mitigation Of Window Effects In Inverse Synthetic Aperture Radar (Isar) Imagery Using Multi-Resolution Technique, Suman Kumar Gunnala
Mitigation Of Window Effects In Inverse Synthetic Aperture Radar (Isar) Imagery Using Multi-Resolution Technique, Suman Kumar Gunnala
Electrical Engineering Theses - Archive
A method using Multi-Resolution technique for window effect mitigation in ISAR imagery, which occurs due to finite extent data, is presented in this work. Proposed method is supported with quantitative measure using both Structural Similarity (SSIM) and Mean Square Error (MSE). In addition, above index measures were used to determine the best choice of wavelet basis for window effect mitigation. Complete angular window and partial angular window are used as two cases to demonstrate the validation of above contributions. Scattering measurements of different test sets were done to validate the approach. Results which include reconstructed images and quantitative index measures …
Analysis And Optimal Design Of Beams Using Radial Basis Function, Yung-Kang Sun
Analysis And Optimal Design Of Beams Using Radial Basis Function, Yung-Kang Sun
Mechanical and Aerospace Engineering Dissertations - Archive
The application of Multiquadric Radial Basis Function (MQ RBF) in the analysis and optimal design of beams are addressed in this dissertation. For static analysis, a new Least Square Collocation (LSC) method is introduced. For buckling and vibration analysis, Rayleigh-Ritz analysis procedures are presented using MQ RBF basis function. Numerical results show that LSC can provide better results than the classical collocation method when the same number of collocation points are used. In vibration analysis, MQ RBF-based Rayleigh-Ritz can be used to calculate natural frequency accurately for several hundred modes. The important question of choosing shift parameters is discussed and …
Enhancement Of Cryoinjury By Use Of Eutectic Crystallization Of An Amino Acid Adjuvant, Chuo-Li Wang
Enhancement Of Cryoinjury By Use Of Eutectic Crystallization Of An Amino Acid Adjuvant, Chuo-Li Wang
Mechanical and Aerospace Engineering Theses - Archive
Enhancement of cryoinjury by use of eutectic formation was investigated to improve the efficacy of cryosurgery. Although the enhancement of cryoinjury associated with eutectic crystallization of sodium chloride (NaCl) has been demonstrated, its advantage can be maximized with adjuvants which are biocompatible and have higher eutectic temperature than NaCl. In this study, the feasibility of glycine, which is less toxic and have higher eutectic temperature than NaCl, was tested. Two groups of MCF-7 human breast cancer cell were suspended in isotonic saline with glycine, then were frozen and thawed on a directional solidification stage in the same protocol except that …