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Articles 1651 - 1680 of 2904

Full-Text Articles in Engineering

Complexity Reduction In Hevc Intra Coding And Comparison With H.264/Avc, Vinoothna Gajula Jan 2013

Complexity Reduction In Hevc Intra Coding And Comparison With H.264/Avc, Vinoothna Gajula

Electrical Engineering Theses - Archive

ITU-T (VCEG) and ISO/IEC (MPEG) collaborated and formed the joint collaborative team on video coding (JCT-VC) in April 2010 to develop the next-generation video coding (NGVC) standard.. HEVC standard doubles the coding efficiency and the approximately 50% less bit rate with respect to H.264/AVC, at nearly the same video quality at expense of increased complexity. In this thesis, a technique is proposed to reduce the complexity of HEVC intra coding to get better encoding time, involving two steps - first by optimizing the PU (prediction unit) size decision process using texture complexity analysis by intensity gradients and second to obtain …

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Mesenchymal Stem Cells As Targeted Cell Vehicles To Deliver Drug-Loaded Nanoparticles For Cancer Therapy, Kytai Truong Nguyen Jan 2013

Mesenchymal Stem Cells As Targeted Cell Vehicles To Deliver Drug-Loaded Nanoparticles For Cancer Therapy, Kytai Truong Nguyen

Bioengineering Faculty Publications - Archive

No abstract provided.

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Thermo-Mechanical Analysis Of Nano-Imprint Lithography, Bhavik C. Patel Jan 2013

Thermo-Mechanical Analysis Of Nano-Imprint Lithography, Bhavik C. Patel

Mechanical and Aerospace Engineering Theses - Archive

Nanoimprint Lithography is being explored by the semiconductor industries for future high volume fabrication of silicon chips, memory devices and patterned media. Nanolithography and Microlithography has played pivotal role in the field of manufacturing microchips and integrated circuits in semiconductor devices. There is an urge to investigate Nanoimprint lithography, a high-throughput, low-cost and nonconventional lithographic method. Thermal management is a critical area that is necessary to be administrated. As recent advancements are being observed in the field of electronic packaging for thermal optimization, likewise steps are also important in this fabrication process. This process involves a heat that is generated …

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Compressibility Effects On The Non-Linear Receptivity Of Boundary Layers To Dielectric Barrier Discharges, Marie F.C. Denison Jan 2013

Compressibility Effects On The Non-Linear Receptivity Of Boundary Layers To Dielectric Barrier Discharges, Marie F.C. Denison

Mechanical and Aerospace Engineering Theses - Archive

The reduction of drag and aerodynamic heating caused by boundary layer transition is of central interest for the development of hypersonic vehicles. Receptivity to flow perturbation in the form of Tollmien-Schlichting (TS) wave growth often determines the first stage of the transition process, which can be delayed by depositing specific excitations into the boundary layer. Weakly ionized Dielectric Barrier Discharge (DBD) actuators are being investigated as possible sources of such excitations, but little is known today about their interaction with high-speed flows. In this framework, the first part of the thesis is dedicated to a receptivity study of laminar compressible …

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Rotordynamic Performance Of A Rotor Supported By Three Pad Hybird Foil Bearings With Controlled Air Injection, Sandesh Gudemane Jan 2013

Rotordynamic Performance Of A Rotor Supported By Three Pad Hybird Foil Bearings With Controlled Air Injection, Sandesh Gudemane

Mechanical and Aerospace Engineering Theses - Archive

Air Foil Bearings have found their place in the commercial applications of turbo machinery. They are cleaner and more reliable at high speeds than their conventional counterparts (Rolling Element Bearings). Low drag friction and apparently no contact during the operation results in a better service life and superior rotor-dynamic performance of the air foil bearings (AFBs). With these advantages AFB has proved to be a suitable option for oil-free turbo-machinery. Further development in AFBs suggest that pressurizing these bearings externally results in remarkably better load carrying capacity, heat dissipation and a more stable rotor. These externally air pressurized bearings which …

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Evaluation Of Surface Transportation Funding Alternatives Using Criteria System Established Through A Delphi Survey Of Texas Transportation Experts, Sasanka Bhushan Pulipati Jan 2013

Evaluation Of Surface Transportation Funding Alternatives Using Criteria System Established Through A Delphi Survey Of Texas Transportation Experts, Sasanka Bhushan Pulipati

Civil Engineering Dissertations - Archive

For more than a decade, transportation officials have been concerned that, at current levels, the fuel tax, the primary funding source of surface transportation in the United States, would not provide enough revenue to satisfy the ever rising transportation needs. Recent studies have evaluated alternative funding strategies at the national and state levels. In this dissertation, the author improves this evaluation procedure by developing a multi-criteria evaluation of different funding options for implementation in Texas using a technique called PROMETHEE. This evaluation uses a new criteria system established through his Delphi survey of Texas-based experts who are experienced in transportation …

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Development Of A Model To Simulate The Single-Limb Stance Phase Of Walking To Determine The Limits Of Stability, Clifford Lee Hancock Jan 2013

Development Of A Model To Simulate The Single-Limb Stance Phase Of Walking To Determine The Limits Of Stability, Clifford Lee Hancock

Bioengineering Theses - Archive

Falls during walking are the primary cause of injuries for older persons and present a high associated cost to society due to the resulting treatment. Hence, the control of balance while moving is an essential issue especially amongst the elderly population. Better understanding of why and how these falls occur could lead to better fall prevention methods, therapies, or devices. These changes could effectively decrease overall emergency room visits, create more room in hospitals for other demands, and decrease medical costs for fall-related disabilities and deaths amongst patients overall. This study attempted to develop an inverted pendulum model of the …

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Microfluidic Device For Determining Preferential Cell Migration Toward Extracellular Matrix Proteins, Neil Hall Jan 2013

Microfluidic Device For Determining Preferential Cell Migration Toward Extracellular Matrix Proteins, Neil Hall

Bioengineering Theses - Archive

Extracellular matrix (ECM) proteins interact with cells in bodily microenvironments by influencing their essential cellular processes in growth, survival, migration and repair after injury. In this study, a novel microfluidic device was developed to study preferential interactions of cells with multiple extracellular matrix proteins simultaneously in an unbiased manner. The implementation of PDITC-treated glass and a controlled laminar flow of multiple separated, soluble proteins was used to create an unbiased microenvironment in which ECM proteins are adsorbed on the glass surface in a manner that simultaneously exposes cells to multiple proteins, and allows them to migrate or outgrow toward the …

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Recombinant Expression, Purification And Kinetic Characterization Of F₄₂₀-Cofactor Dependent Glucose-6-Phosphate Dehydrogenase From Mycobacterium Tuberculosis, Tijani Osumah Jan 2013

Recombinant Expression, Purification And Kinetic Characterization Of F₄₂₀-Cofactor Dependent Glucose-6-Phosphate Dehydrogenase From Mycobacterium Tuberculosis, Tijani Osumah

Bioengineering Theses - Archive

The FGD (F₄₂₀-dependent Glucose-6-phosphate dehydrogenase) enzyme is an F₄₂₀ Cofactor (7,8-didemethyl-8-hydroxy-5-deazariboflavin) dependent enzyme found in Mycobacterium tuberculosis, the causative agent of tuberculosis (TB). TB is still a prominent cause of illness and death worldwide. Because FGD is not found in humans, makes it a good target for drug development. By understanding the hydride transfer mechanism of the FGD in detail, we can aid in the improvement of drug targeting and development for the treatment of TB. FGD catalyzes the conversion of glucose-6-phosphate to 6-phosophogluconolactone. This project focuses on the purification and kinetic characterization of recombinant FGD using steady-state and pre-steady …

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Improving Cooling Efficiency Of Servers By Replacing Smaller Chassis Enclosed Fans With Larger Rack-Mount Fans, Bharath Nagendran Jan 2013

Improving Cooling Efficiency Of Servers By Replacing Smaller Chassis Enclosed Fans With Larger Rack-Mount Fans, Bharath Nagendran

Mechanical and Aerospace Engineering Theses - Archive

As a common practice in the data center industry, chassis fans are used to direct air flow independent from neighboring servers. However, these fans are less efficient compared to larger rack level counterparts and also operate at higher sound levels. In this study, a novel approach is proposed whereby the smaller chassis enclosed fans are replaced with an array of larger fans, installed behind the stacked servers that share air flow. As a baseline study for comparison of the current scenario, a CPU dominated 1.5U Open Compute server, with four 60mm fans installed within the server, is characterized experimentally for …

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Comparative Analysis Of Widely Used Air Containment Systems In Commercial Data Centers For Maximum Cooling Performance, Kasturi Rangan Rajagopalan Jan 2013

Comparative Analysis Of Widely Used Air Containment Systems In Commercial Data Centers For Maximum Cooling Performance, Kasturi Rangan Rajagopalan

Mechanical and Aerospace Engineering Theses - Archive

Many data centers implement containment systems to improve cooling system performance. Literature review shows that Hot Aisle Containment System (HACS) have higher supply air temperature set point than Cold Aisle Containment Systems (CACS) [1]. CACS in data centers have claims to support higher density loads when compared to HACS systems [2]. Data center owners suggest that containment of a group of racks can be a very effective technique to improve cooling performance. On the other hand, others suggest that fewer area for containment is better than no containment in data centers that favours the partially contained architectures of HACS and …

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Real Time Temperature Prediction In A Data Center Environment Using An Adaptive Algorithm, Vishok Amar Kumar Jan 2013

Real Time Temperature Prediction In A Data Center Environment Using An Adaptive Algorithm, Vishok Amar Kumar

Mechanical and Aerospace Engineering Theses - Archive

Most organizations around the world rely on information systems to run their operations. Data centers are hence a crucial aspect of most organizational operations to ensure business continuity. Disruption in the working of a system can impair the business largely and hence optimizing the environment in which the servers and storage devises of a data center are housed becomes extremely challenging. Most industries design the data center infrastructure to handle peak load conditions thus ensuring a continual functionality of its hosted environment. However, the cost of maintaining such a system is very high. This gives rise to the need of …

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A Computational Model To Characterize Different Flow Regimes For Microscale Re-Entry Satellites, Sudharsan Thiruvenkadam Jan 2013

A Computational Model To Characterize Different Flow Regimes For Microscale Re-Entry Satellites, Sudharsan Thiruvenkadam

Mechanical and Aerospace Engineering Theses - Archive

Atmospheric re-entry vehicles experience different flow regimes during flight due to the change in atmospheric density along the re-entry trajectory. This change in density creates non-equilibrium regions on the order of mean free path, called Knudsen layer. In the design of atmospheric re-entry vehicles, the flux variations near the wall of the re-entry vehicles are of critical importance. Traditional CFD simulations that use Navier-Stokes equations fail to predict the flow in the Knudsen layer. The Direct Simulation Monte Carlo (DSMC) method is accurate for all flow regimes, and correctly models the Knudsen layer but is computationally expensive. The computational cost …

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Fabrication And Characterization Of Single Electron Device And Study Of Energy Filtering In Single Electron Transport, Liang-Chieh Ma Jan 2013

Fabrication And Characterization Of Single Electron Device And Study Of Energy Filtering In Single Electron Transport, Liang-Chieh Ma

Material Science and Engineering Dissertations - Archive

Single electron devices, in which transport of single electrons is precisely controlled, hold a great promise as important components of future electronic devices and sensors. However, technical challenges have prevented their implementations to practical electronic and sensing systems. First of all, the fabrication of single electron devices requires their components to be defined and arranged in nanoscale precision, a great challenge for a large-scale fabrication. Secondly, for room temperature operation, the single-electron charging energy should be much larger than the room-temperature thermal energy, ~25 meV, requiring use of extremely small Coulomb island, which is difficult to control. This has limited …

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Corrosion And Hydrogen Embrittlement Of Nanocrystalline Nickel, Tapas Desai Jan 2013

Corrosion And Hydrogen Embrittlement Of Nanocrystalline Nickel, Tapas Desai

Material Science and Engineering Theses - Archive

Nanocrystalline (nc) materials have attracted the interest of the scientific community because of their unique physical and mechanical properties. However, limited research has been performed to analyze their electrochemical behavior. The majority of research in the field of electrochemical and corrosion behavior exists for electrodeposited nanocrystalline metals.This research studies the behavior of sputter-deposited nc Nickel films in corrosive and hydrogen environment by potentiodynamic polarization and microindentation. The surface morphology and composition of the samples was examined by Scanning Electron Microscopy and Energy Dispersive X-Ray spectroscopy. Bulk Ni samples exhibit mild passivation in 3.5 % NaCl solution. The surface reveals a …

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Improving Productivity Of Tunnel Boring Machines, Nicholas Jencopale Jan 2013

Improving Productivity Of Tunnel Boring Machines, Nicholas Jencopale

Civil Engineering Theses - Archive

Tunneling with tunnel boring machines (TBMs) is one of the most mechanized and sophisticated processes within the construction industry. However, there are risks when venturing down several hundred feet where the conditions cannot be accurately determined in advance. Months and years of planning, engineering, profiling, researching, and scheduling go into a typical tunneling project before any ground breaking event. This thesis will discuss in detail the growing technologies of the tunneling process using tunnel boring machines (TBM). First, some background information on tunneling and the use of a TBM will be provided to introduce the process and the industry being …

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Corrosion Potentials Of Lightweight Concrete Wrapped With Fiber Reinforced Polymers (Frp), Eric Goucher Jan 2013

Corrosion Potentials Of Lightweight Concrete Wrapped With Fiber Reinforced Polymers (Frp), Eric Goucher

Civil Engineering Theses - Archive

The purpose of this research was to investigate the effects of Fiber Reinforced Polymer wraps on corrosion protection of lightweight concrete. Many studies have been undertaken for normal density concrete, but there are very few studies regarding lightweight concrete and externally bonded FRP wraps. This experiment involved the use of an accelerated corrosion test to determine the corrosion protection that FRP would afford lightweight concrete, while making a comparison with a similarly proportioned normalweight mix. 42 cylinders were subject to a constant 12 V power from a DC Power Supply while being immersed in a 5% NaCl for a period …

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Structural And Material Performance Of Rubberized And Hybrid Concrete Pipes, Mohammad Mohammadagha Jan 2013

Structural And Material Performance Of Rubberized And Hybrid Concrete Pipes, Mohammad Mohammadagha

Civil Engineering Theses - Archive

This study investigates how the combination of steel fiber, crumb rubber, synthetic fiber, and conventional steel cage will improve the ductility of regular concrete pipes and thin-walled semi-rigid concrete pipes. In this study, pipes with four different concrete mixtures were produced and tested: (1) Steel Bar Reinforced Concrete Pipe (SBRCP), (2) Crumb Rubber Reinforced Concrete Pipe (CRRCP), (3) Steel Fiber Reinforced Concrete Pipe (SFRCP), and (4) Synthetic Fiber Reinforced Concrete Pipe (SNFRCP). This study investigates how the variation of the fiber volume fraction and crumb rubber content in concrete mix affects the behavior of pipes with diameters ranging from 24in. …

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Ensemble Streamflow Forecasting For The Upper Trinity River Basin In Texas, Manabendra Saharia Jan 2013

Ensemble Streamflow Forecasting For The Upper Trinity River Basin In Texas, Manabendra Saharia

Civil Engineering Theses - Archive

By allowing for routine use of longer-lead quantitative precipitation forecast (QPF) in hydrologic prediction, ensemble forecasting offers hope for extending the lead time for short-range streamflow forecasting. In this work, this potential is assessed by comparatively evaluating ensemble streamflow hindcasts forced by Day 1-3 QPF with those forced by Day 1 QPF for five headwater basins in the Upper Trinity River Basin in North Texas. The hindcasts are generated for a 7-year period of 2004 to 2010 using the Hydrologic Ensemble Forecast Service (HEFS), which operates on the Community Hydrologic Prediction System (CHPS) of the National Weather Service (NWS). HEFS …

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The Relation Between Freeway Average Speed And Speed Noise, Bahar Zarin Jan 2013

The Relation Between Freeway Average Speed And Speed Noise, Bahar Zarin

Civil Engineering Theses - Archive

A significant amount of energy could be saved by applying traffic management policies. Many factors affect the fuel consumption rate, and the most important traffic-related ones include variables such as speed, number of stops, the speed noise, and the acceleration noise. Fuel consumption models for both urban and highway traffic are used to evaluate the effect of these factors. Previous literature shows the speed and the acceleration of the individual vehicles as well as the aero-dynamic effects are the most considered parameters in highway fuel consumption models. However, the existing models are based on the average or cruising speed and …

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Nanomaterials For Photo-Based Diagnostic And Therapeutic Applications, Baohong Yuan, Jyothi Unnikrishna Menon, Khanh Vu, Parth V. Jadeja, Kytai Truong Nguyen, Pranjali P. Tambe Jan 2013

Nanomaterials For Photo-Based Diagnostic And Therapeutic Applications, Baohong Yuan, Jyothi Unnikrishna Menon, Khanh Vu, Parth V. Jadeja, Kytai Truong Nguyen, Pranjali P. Tambe

Bioengineering Faculty Publications - Archive

Photo-based diagnosis and treatment methods are gaining prominence due to increased spatial imaging resolution, minimally invasive modalities involved as well as localized treatment. Recently, nanoparticles (NPs) have been developed and used in photo-based therapeutic applications. While some nanomaterials have inherent photo-based imaging capabilities, others including polymeric NPs act as nanocarriers to deliver various fluorescent dyes or photosensitizers for photoimaging and therapeutic applications. These applications can vary from Magnetic Resonance Imaging (MRI) and optical imaging to photothermal therapy (PTT) and chemotherapy. Materials commonly used for development of photo-based NPs ranges from metal-based (gold, silver and silica) to polymer- based (chitosan, dextran, …

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A Cmos Conductometric Circuit For Chemical Sensing Using Nanowire Sensor Arrays, Sujith S. Dermal Jan 2013

A Cmos Conductometric Circuit For Chemical Sensing Using Nanowire Sensor Arrays, Sujith S. Dermal

Electrical Engineering Theses - Archive

In this thesis, a readout circuit for conductometric electrochemical sensor array is designed and implemented. It is designed to work with the output range of a Carbon Nanotube Chemiresistive Sensor Array. The sensor arrays are designed to measure the Volatile Organic Compounds (VOCs) in the environment. The circuit reads out the outputs of the sixteen conductometric sensor arrays and calculates the change in conductance during the interaction with the chemicals present in the environment. A constant voltage is applied to the sensor arrays and when the sensor detects the VOCs, it changes the conductance and a change in current through …

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Distributed Data Dimensionality Reduction And Denoising, Abiodun T. Aduroja Jan 2013

Distributed Data Dimensionality Reduction And Denoising, Abiodun T. Aduroja

Electrical Engineering Theses - Archive

With the recent upsurge in the amount of data transmission and use, giving rise to the era of big data, research has put a lot of emphasis on designing efficient methods to extract useful information by reducing the size of a large set of data to a much smaller set. This is the main idea in data dimensionality reduction which is a critical step in applications that involve a constantly increasing data size, and limited computational and communication resources. Such a situation appears in sensor networks where there is a large number of sensors acquiring data. However, the informative part …

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Eutectic Diffusion Brazing Process For Joining Aluminum Laminae With Macro- And Micro- Scale Features, Paul Wilson Jan 2013

Eutectic Diffusion Brazing Process For Joining Aluminum Laminae With Macro- And Micro- Scale Features, Paul Wilson

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Eutectic brazing occurs when two metals, such as aluminum and copper, react and diffuse together at a temperature lower than either material would melt separately. Commonly used in electronics manufacturing, this brazing method provides the basis for a new process of joining a laminated device with micro fluidic features. The proposed process overcomes the challenges of aluminum oxidation resulting from traditional diffusion bonding of aluminum laminae and does not require flux or caustic material pre-treatments. The process also protects surface geometries and avoids warpage, which is common with other higher-temperature joining processes such as welding. This research provides a foundation …

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Outcome And State Transition Modeling For Adaptive Interdisciplinary Pain Management, Aera Kim Leboulluec Jan 2013

Outcome And State Transition Modeling For Adaptive Interdisciplinary Pain Management, Aera Kim Leboulluec

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Pain management is a major global health problem. The World Health Organization estimates that, globally, 1 in 5 adults suffer from chronic pain and in the United States alone, chronic pain affects nearly 100 million adults resulting in an estimated annual cost of $560 to $635 billion. The University of Texas at Arlington and the Eugene McDermott Center for Pain Management at the University of Texas Southwestern Medical Center at Dallas (The Center) are collaborating to seek adaptive treatment strategies for interdisciplinary pain management in a two-stage program. Interdisciplinary pain management combines multiple disciplines of professionals to understand the biological …

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Development Of Optimal Decision Model For Multi-System Process Capability Improvements Through A Personnel Environment And Integration (Pei) Framework Utilizing Radio Frequency Identification (Rfid) Technology, Maurice Dwayne Cavitt Jan 2013

Development Of Optimal Decision Model For Multi-System Process Capability Improvements Through A Personnel Environment And Integration (Pei) Framework Utilizing Radio Frequency Identification (Rfid) Technology, Maurice Dwayne Cavitt

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

This research describes a framework that minimizes uncertainty and risk in lead time and excessive costs associated with multi-automating systems in very complex and dynamic environments. Further, by seeking to reduce risk by increasing the reliability component of the system, crucial inventories levels are maintained and leveraged in complex an environment that provides additional organization cost savings and enhanced flexibility by enhancing their ability to optimize inventories. Inventory control is crucial for any supply chain as it drives the costs which influence business decision models. The reliability of the systems that maintain the important inventories in complex operations is crucial …

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Multistep Second Order Training For The Multilayer Perceptron, Melvin Deloyd Robinson Jan 2013

Multistep Second Order Training For The Multilayer Perceptron, Melvin Deloyd Robinson

Electrical Engineering Dissertations - Archive

Training a feedforward multilayer perceptron (MLP) requires obtaining train- ing data and solving a non-convex optimization problem to calculate the network's weights. Various problems can arise during training that ultimately can limit a MLP's usefulness such as slow convergence and high computational complexity. Additionally, when training one needs to have confidence that the chosen algorithm is working optimally for the chosen coordinate system.We introduce novel second order training algorithms to overcome these difficulties. In the process, a piecewise affine model of the multilayer perceptron is introduced which shows that objective functions for training are poorly modeled by quadratic functions of …

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A Study Of The Characteristics And Limitations Of Various Platings On Cylindrical Electrical Conductors, Robert C. Scully Jan 2013

A Study Of The Characteristics And Limitations Of Various Platings On Cylindrical Electrical Conductors, Robert C. Scully

Electrical Engineering Dissertations - Archive

This work explores the impedance characteristics of copper wires plated with tin, silver, or nickel, the most common type of wiring used in the computer, communications, and aerospace industries. The background of plated wires and a brief review of related research is provided. This is followed by a detailed development of the theory of plated wires, accompanied by a MAPLE code in the appendix that can be used for the numerical analysis of plated wires having two or more plating layers. The code was used to generate a series of curves predicting the impedance behavior of both solid, "pure" metals, …

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Capacity Fading Induced On Electrochemical Energy Storage Cells As A Result Of High C Discharge, Biju Shrestha Jan 2013

Capacity Fading Induced On Electrochemical Energy Storage Cells As A Result Of High C Discharge, Biju Shrestha

Electrical Engineering Dissertations - Archive

A number of electrochemical energy storage devices have been developed and used widely to power portable electronic systems. Lithium-ion batteries are extremely popular for use in portable devices as a result of their high energy density, which is higher than almost all other similar technologies available. Despite their high energy density, most commercial off-the-shelf (COTS) cells are only modestly power dense, limiting them from being used to drive high power or pulsed power applications. Recently, improvements in the electrode structures and electrolytes have led to the development of lithium-ion batteries which have a higher combined power and energy density than …

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Optimizing The Use Of Systems Engineering On Proposals, Clement Douglas Smartt Jan 2013

Optimizing The Use Of Systems Engineering On Proposals, Clement Douglas Smartt

Industrial, Manufacturing, and Systems Engineering Dissertations - Archive

Organizations whose primary business is executing contracts must be able to capture contracts to survive. When the contracts involve engineering complex systems, systems engineering often plays a significant role in the proposal process, sometimes leading the technical effort. This research seeks to find an optimal use of systems engineering in proposal management to maximize the probability that a supplier organization will be awarded contracts. A number of systems engineering related factors that can potentially be used to predict contract awards are identified that pertain to the organization, the skill levels of employees, the competitive environment, the proposal project, the contract, …

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