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2016

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Articles 4951 - 4980 of 9607

Full-Text Articles in Engineering

Interaction Of Fibrinogen With Fibronectin: Purification And Characterization Of A Room Temperature-Stable Fibrinogen-Fibronectin Complex From Normal Human Plasma, Ayman E. Ismail May 2016

Interaction Of Fibrinogen With Fibronectin: Purification And Characterization Of A Room Temperature-Stable Fibrinogen-Fibronectin Complex From Normal Human Plasma, Ayman E. Ismail

Department of Chemical and Biomolecular Engineering: Dissertations, Theses, and Student Research

A fibrinogen-fibronectin complex (γγ’pdFI-pdFN) was purified from normal human plasma using a sequence of cryoprecipitation, ammonium sulfate fractionation, and DEAE Sepharose chromatography. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) under reducing condition showed both a 1:1 stoichiometric ratio of fibrinogen (FI) to fibronectin (FN) as well as a stoichiometric ratio of 1:1 of γg to gγ’. The γγ’pdFI-pdFN complex was non-covalent in nature as it was disrupted by affinity adsorption to Gelatin Sepharose where pdFN bound strongly and the disrupted γγ’pdFI fell through the chromatographic column. Surprisingly, the purified γγ’pdFI-pdFN complex was more broadly thermally stable than plasma FI (pdFI) …

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The Design And Control Of A Battery-Supercapacitor Hybrid Energy Storage Module For Naval Applications, Isaac J. Cohen May 2016

The Design And Control Of A Battery-Supercapacitor Hybrid Energy Storage Module For Naval Applications, Isaac J. Cohen

Electrical Engineering Dissertations - Archive

As the Navy transitions to a more electrical fleet, the electrical architectures must adapt to the changing load profiles. With the introduction of electrical propulsion and new types of electrical energy based weapons, load profiles have become higher power and more transient than ever seen before – especially during directed energy weapon operation. One issue that has become apparent with the introduction of these transient loads is the ability of traditional generation sources, such as fossil fuel generators, to power them. Generators are stiff sources of power which suffer efficiency losses when they deviate from operating at a constant maximum …

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Silicon Nitride Devices For Nonlinear And Quantum Optics Applications, Sarath Chandra Samudrala May 2016

Silicon Nitride Devices For Nonlinear And Quantum Optics Applications, Sarath Chandra Samudrala

Electrical Engineering Dissertations - Archive

The technology of fabricating photonic devices on silicon wafers using the well established CMOS process methodology has been under active investigation for several years. In particular, microring resonators have been shown to have several applications in telecommunications, in sensors and in nonlinear and quantum optics. This dissertation presents theoretical details and experimental results of silicon-nitride-based microring resonators fabricated on silicon wafers. The theoretical details of optical waveguides and numerical simulations of submicron thick waveguides are discussed. Later, the fabrication details of microring resonators and the experimental results of transmission properties of these microrings are presented. Further, the dispersion in microrings …

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Cooperative Control Of Multiple Untethered Magnetic Microrobots For Precision Micromanipulation, Nahum Arenas Torres May 2016

Cooperative Control Of Multiple Untethered Magnetic Microrobots For Precision Micromanipulation, Nahum Arenas Torres

Electrical Engineering Dissertations - Archive

The field of untethered microrobotics has emerged within the last two decades for its applications potential in military surveillance, micro and nano manufacturing, as well as in health care for minimal invasive surgery and drug delivery. Microrobots need to be fast and precise in order to be useful as a tool for manufacturing applications. It is well understood that at this size scale numerous challenges prevail such as stiction between microrobot and environment, providing power, locomotion control, and intelligence to microrobots and motion measurement. In order to accelerate the research in this field, I participated in the Mobile Microrobotics Challenge …

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Electronic Biosensors For Early Cancer Detection, Waqas Ali May 2016

Electronic Biosensors For Early Cancer Detection, Waqas Ali

Electrical Engineering Dissertations - Archive

Nanotechnology is an emerging field that holds promise to improved disease diagnosis and better health care. It has revolutionized the medical industry and is continuing to mesmerize in other research areas as well. Even after tremendous advancements in disease detection and treatment techniques, high mortality rate due to cancer necessitates the need for new sensing platforms for early cancer detection. The focus of this dissertation is development of new sensing platforms that are highly sensitive and selective and are able to detect the tumor at an early stage i.e. cellular or molecular level. We demonstrated that breast cancer tumor cells …

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Regularized Canonical Correlations In Clustering Sensor Data, Jia Chen May 2016

Regularized Canonical Correlations In Clustering Sensor Data, Jia Chen

Electrical Engineering Dissertations - Archive

In many data acquisition applications such as in sensor networks, the acquired sensor measurements contain information about multiple sources placed at different spatial locations. Such sources could correspond to different e.g., thermal sources or transmitters placed at different locations inside the sensed field. Before applying any statistical inference task, it is essential to identify which groups of sensors acquire observations that contain information about the same sources. This is essential to avoid `mixing' observations that contain information about uncorrelated sources. In this thesis, the goal is to cluster sensors into different groups based on their source information content about the …

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Optofluidic Photonic Crystal Platform For Label-Free Detection And Gas Sensing, Shuling Wang May 2016

Optofluidic Photonic Crystal Platform For Label-Free Detection And Gas Sensing, Shuling Wang

Electrical Engineering Dissertations - Archive

Photonic crystals (PhCs) based label-free sensing technology has great potential as a highly sensitive, high-throughput, and compact that has vast applications in biomedical research, healthcare, pharmaceuticals, environmental security, and battlefield to detect target analytes in either liquid or vapor phase. The PhC refers to a heterogeneous structure composed of a periodic arrangement of low-loss dielectric materials with contrasting refractive index (RI). Such a structure constrains the light propagation in certain ways such that the optical properties of the PhC are particularly sensitive to changes in RI, which in turn makes them useful for sensing purposes, since the interaction of target …

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Exploiting Higher-Order Statistics In Radar Data For Scattering Center Isolation, Jeffrey Brandon Hall May 2016

Exploiting Higher-Order Statistics In Radar Data For Scattering Center Isolation, Jeffrey Brandon Hall

Electrical Engineering Dissertations - Archive

Embedded in each observation of a RADAR system is an amalgam of scattered signals. An important function of RADAR signal processing is to resolve or separate this mixture of target signals. Imaging using RADAR data is a well-established area of research. Conventional RADAR imaging methods use a two-dimensional Fourier transform to back-project RADAR measurements to scattering sources [1]. The Fourier transform based imaging techniques have resolution limited by the bandwidth and spatial diversity of available data samples. Super-resolution methods such as MUSIC overcome the resolution limitation by employing an alternate model for the measured data [2]. These techniques are capable …

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Transfer Printed Semiconductor Nanomembranes For Heterogeneously Integrated Multi-Band Imager Arrays, Laxmy Menon May 2016

Transfer Printed Semiconductor Nanomembranes For Heterogeneously Integrated Multi-Band Imager Arrays, Laxmy Menon

Electrical Engineering Dissertations - Archive

The electronics industry is ruled by silicon which is realized as the solution to meet the requirements of higher bandwidth and low cost high density monolithic integration. However, silicon has its limitations when it comes to high frequency or optoelectronic applications. Fusion of several functionalities on one chip can be obtained by heterogeneous integration of materials that have optimized performance for a specific application. The ability to tailor heterogeneous materials to be able to integrate them with each other, in rigid or flexible form, can lead to novel and superior functionalities, with impact in multitude of areas like electronics, optoelectronics, …

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Microstructure And Properties Of Hard And Optically Transparent Hfo2 Films Prepared By High-Rate Reactive High-Power Impulse Magnetron Sputtering, Nai-Wen Pi May 2016

Microstructure And Properties Of Hard And Optically Transparent Hfo2 Films Prepared By High-Rate Reactive High-Power Impulse Magnetron Sputtering, Nai-Wen Pi

Material Science and Engineering Theses - Archive

Hafnium Dioxide (HfO2) has an extraordinary high bulk modulus, high hardness, high chemical stability, high melting point and high thermal stability. This material can be used as protective coatings for application involving high temperature environments. HfO2 films were fabricated on Si using high-rate reactive high-power impulse magnetron sputtering (HiPIMS) using different deposition-averaged target power density and voltage pulse durations t1. Five HfO2 films were prepared with (1) t1 = 25 µs, =7.6 Wcm-2 (T25S7), (2) t1 = 100 µs, =7.2 Wcm-2 (T100S7), (3) t1 = 200 µs, =7.3 Wcm-2 (T200S7), (4) t1 = 200 µs, =18 Wcm-2 (T200S18) and (5) …

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Silver Dendrite Based Three-Dimensional Surface Enhanced Raman Scattering (Sers) Substrates, Sandesh Rajkumar Shelke May 2016

Silver Dendrite Based Three-Dimensional Surface Enhanced Raman Scattering (Sers) Substrates, Sandesh Rajkumar Shelke

Material Science and Engineering Theses - Archive

Three-dimensional (3D) hierarchical nanostructures have been considered as one of the most promising surface-enhanced Raman spectroscopy (SERS) substrates because it provides high-density hotspots along the three-dimension directions and high surface areas. In this thesis, we report the synthesis process to develop 3D SERS substrates in thin wall quartz capillary tube on Cu wire. These 3D SERS substrates consist of Ag dendrite, Au-Ag and Pd-Ag bimetallic nanostructures which was synthesized by employing simple galvanic replacement reactions (GRR). In this synthesis process Cu wire which is used as substrate was inserted in the thin walled quartz capillary tube and then AgNO3 was …

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Numerical Modeling Of An Alloy Droplet Deposition With Non-Equilibrium Solidification, Vimal Ramanuj May 2016

Numerical Modeling Of An Alloy Droplet Deposition With Non-Equilibrium Solidification, Vimal Ramanuj

Mechanical and Aerospace Engineering Dissertations - Archive

Droplet deposition is a process of extensive relevance to the microfabrication industry. Various bonding and film deposition methods utilize single or multiple droplet impingements on a substrate with subsequent splat formation through simultaneous spreading and solidification. Splat morphology and solidification characteristics play vital roles in determining the final outcome. Experimental methods have limited reach in studying such phenomena owing to the extremely small time and length scales involved. Fundamental understanding of the governing principles of fluid flow, heat transfer and phase change provide effective means of studying such processes through computational techniques. The present study aims at numerically modeling and …

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Enhanced Specific Heat Of Molten Salt Nanofluids, Hani Tiznobaik May 2016

Enhanced Specific Heat Of Molten Salt Nanofluids, Hani Tiznobaik

Mechanical and Aerospace Engineering Dissertations - Archive

Concentrated solar power uses general thermodynamic cycles (such as Rankine or Gas turbine cycle) to produce electricity and thus its efficiency primarily relies on the operating temperature of thermal energy storage. Current thermal energy storage medium is organic material such as synthetic oil or fatty acid. However, these materials are not stable at high temperatures due to their thermal decomposition. Using molten salts as thermal energy storage medium is a very attractive option since they are thermally stable at high temperatures (over 600 °C). They also have very lower vapor pressure (for reducing mechanical stress on structure materials), less reactive, …

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Data Engineering In Aerospace Systems Design & Forecasting, Eric Haney May 2016

Data Engineering In Aerospace Systems Design & Forecasting, Eric Haney

Mechanical and Aerospace Engineering Dissertations - Archive

Although engineers spend the majority of their time finding, managing, and transforming data, the process of how to handle data remains under-educated & under-researched. The alignment of engineering education & proficiency along an analysis-dominated mindset is ill-conditioned for the growing reliance on data-driven processes and holistic decision-making requirements. Although a majority of driving decisions in the aerospace industry rely heavily on utilizing existing organizational data-stores and built-in knowledge bases to make informed decisions, formalized development & implementation of data within existing engineering processes is seldom addressed. The current research defines a complementary discipline, Data-Engineering, which seeks to capitalize on the …

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Exergy Analysis Of A Pulse Detonation Engine Linear Power Generator, Raheem Temitope Bello May 2016

Exergy Analysis Of A Pulse Detonation Engine Linear Power Generator, Raheem Temitope Bello

Mechanical and Aerospace Engineering Dissertations - Archive

The fuel efficiency of a power generator is a key metric for evaluating its performance. The common engineering practice is to determine the thermal efficiency of the system by applying the conservation of energy also known as the first law of thermodynamics. However, for heat engine power generators, and other thermal systems, the thermal efficiency is not sufficient for detailed system performance analysis. Exergy analysis, which applies both the first and second law of thermodynamics, enables the determination of the directionality of thermal processes, and the system’s available work. This more complete thermodynamic analysis approach is applied to a pulse …

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Maximizing Use Of Air-Side Economization, Direct And Indirect Evaporative Cooling For Energy Efficient Data Centers, Betsegaw Kebede Gebrehiwot May 2016

Maximizing Use Of Air-Side Economization, Direct And Indirect Evaporative Cooling For Energy Efficient Data Centers, Betsegaw Kebede Gebrehiwot

Mechanical and Aerospace Engineering Dissertations - Archive

Data centers house information technology (IT) equipment such as servers and network switches which are vital for our networked modern society by providing digital data storage, data processing and connectivity. Data centers house few hundreds to tens of thousands of IT equipment that consume few kilowatt-hours to multi-megawatt-hours of electrical energy that gets dissipated as heat. IT equipment need to be properly cooled so that they operate reliably for their expected lifetime. For air cooled IT equipment, manufacturers provide heat sinks, cold plates, fans, et cetera to remove heat from the vicinity of heat dissipating components and data centers need …

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Human Robot Interaction With 3d-Printed Whole Body Robotic Skin, Fahad Mirza May 2016

Human Robot Interaction With 3d-Printed Whole Body Robotic Skin, Fahad Mirza

Mechanical and Aerospace Engineering Theses - Archive

This thesis presents work of a newly developed pressure sensor for robot skin, from fabrication to application. Robot skin similar to human skin meant to have several sensing capabilities including pressure, temperature etc. As the conventional semiconductor manufacturing process is not adequate for multi-modal sensors, a new process, called Electro-Hydro-Dynamic Printing, has been explored in this work. A calibration technique was implemented along with printing parameter fixation by trial and error. A testing methodology was proposed to test these sensors and several commercial robots were used to conduct pHRI experiments with pressure sensing capability.

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Finite Element Based Cross-Sectional Buckling Optimization For A Constant Area, Pinned-Pinned Composite Column, Anirudh Srinivas May 2016

Finite Element Based Cross-Sectional Buckling Optimization For A Constant Area, Pinned-Pinned Composite Column, Anirudh Srinivas

Mechanical and Aerospace Engineering Theses - Archive

In archery, dynamic buckling compromises the target accuracy of arrows. For both dynamic and quasi-static buckling, the buckling load depends on the cross-sectional area moment of inertia, which can be increased by modifying the cross-sectional shape of the arrow shaft. Arrows commercially available today are made up of composite materials and have a tubular circular cross-section. In this study an effort has been made to optimize the cross-sectional shape of the composite arrow shaft, using finite element based, quasi-static buckling analysis keeping the length and area of the cross-section constant. The composite column is pinned at both ends and is …

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Capacity Fade Of Valve Regulated Lead Acid & Lithium Iron Phosphate Batteries Through High Rate, Pulsed Loads, Christopher Lee Williams May 2016

Capacity Fade Of Valve Regulated Lead Acid & Lithium Iron Phosphate Batteries Through High Rate, Pulsed Loads, Christopher Lee Williams

Industrial, Manufacturing, and Systems Theses - Archive

Electrochemical energy storage has become more power and energy dense in recent years. Many applications demanding energy storage operate in a pulsed manner. The most common chemistries considered for use in these applications include valve regulated lead acid (VRLA) and lithium-ion (LI). In the work presented here, one of each of these types of batteries has been assembled with ~60 V open circuit potentials (OCPs) and is in the process of experimentally characterizing their capacity fade and impedance growth when they are used to drive a high current pulsed load in a 5 seconds on / 5 seconds off pulsed …

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Human Robot Interaction Using Knowledge Base Approach, Utsav Shah May 2016

Human Robot Interaction Using Knowledge Base Approach, Utsav Shah

Mechanical and Aerospace Engineering Theses - Archive

This research investigated Human Robot Interaction modalities. The performance of a robotic prosthetic hand (RPH) was used as a test bed robot. A user wearable glove was fitted with sensors to provide tele-control of the RPH. An open hardware control and easily expandable research platform based on LabVIEW software and myRIO control hardware was developed. LabVIEW graphical programming platform provides the tools for the development to customized interfaces for visualization purposes which is desired in research. The research platform was used to calibrate and control the operation of the artificial hand using various modalities such as open loop, glove master-slave …

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E-Learning Modules For Nuclear Reactor Heat Transfer, Praveen Bharadwaj Jayaram May 2016

E-Learning Modules For Nuclear Reactor Heat Transfer, Praveen Bharadwaj Jayaram

Mechanical and Aerospace Engineering Theses - Archive

E learning in engineering education is becoming popular at several universities as it allows instructors to create content that the students may view and interact with at his/her own convenience. Web-based simulation and what-if analysis are examples of such educational content and has proved to be extremely beneficial for engineering students. Such pedagogical content promote active learning and encourage students to experiment and be more creative. The main objective of this project is to develop web based learning modules, in the form of analytical simulations, for the Reactor Thermal Hydraulics course offered by the College of Engineering at UT Arlington. …

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Experimental And Numerical Study Of Marangoni Convection In A Sandwiched Droplet, Ajinkya Shrikrishna Shetye May 2016

Experimental And Numerical Study Of Marangoni Convection In A Sandwiched Droplet, Ajinkya Shrikrishna Shetye

Mechanical and Aerospace Engineering Theses - Archive

This research studies velocity fields resulted from the marangoni effect in a microscale droplet sandwiched in parallel plates. Surface tension becomes the dominant driving force as opposed to body forces as we move from the macroscale to microscale. Surface tension gradient is required to generate marangoni convection. This could be produced by a temperature gradient along the meniscus of the drop. To study this interfacial phenomenon, indium tin oxide micro thin film heater is utilized to create the necessary temperature gradient. Pure marangoni effect is studied by suppressing the evaporation effect on fluid flow by using an ionic liquid (molten …

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Computational Analysis Of Blast Induced Damage On Neurons In Brain During Traumatic Brain Injury, Divya Swamy Bandaru May 2016

Computational Analysis Of Blast Induced Damage On Neurons In Brain During Traumatic Brain Injury, Divya Swamy Bandaru

Mechanical and Aerospace Engineering Theses - Archive

Concussions are the most common kind of brain injuries, they are also called as mild Traumatic Brain Injuries (mTBI). In recent times, mTBIs are perceived as one of the major health problems faced by millions across the world. TBIs occur when there is a sudden acceleration or deceleration force is applied on the human brain that is encapsulated in the skull. When blasts caused by typical IEDs (induced by explosives) in wars propagate through the head, cavitation bubbles are formed in the brain tissue. When these bubbles collapse, they form cavitation-induced shock wave. It has been found that the strains …

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Image Processing Of Triple Shock Wave Evolution, Katherine Yarbrough May 2016

Image Processing Of Triple Shock Wave Evolution, Katherine Yarbrough

Mechanical and Aerospace Engineering Theses - Archive

Shock diamonds occur in over- or under- expanded supersonic flow. They occur in the unsteady jet of a pulse detonation engine, displaying an array of complex features. Due to the highly transient nature of the flow, it must be captured using high-speed cinematography. A study of image processing of shock reflection in unsteady flow is presented. Using a computer-based environment, a method was developed to process images of shock waves to pinpoint where the shock wave starts. Using mathematical methods, such as Abel transforms, a computer code, written in Matlab, was developed to accurately transform the images to detect density …

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Experimental Characterization Of Hybrid Cooled Cisco Servers Including The Effect Of Warm Water Cooling, Md Malekkul Islam May 2016

Experimental Characterization Of Hybrid Cooled Cisco Servers Including The Effect Of Warm Water Cooling, Md Malekkul Islam

Mechanical and Aerospace Engineering Theses - Archive

The information technology (IT) owners are experiencing a greater cooling challenge because of the increase in power density due to modern computational needs. The non-uniform power density in each server is forcing the industry to use hybrid cooling technology. Server components of different cooling requirement needs air water hybrid cooling which offers variable design alternatives. Such hybrid cooling technology cools the high heat generating components by using water or water based fluid, whereas, the rest of the components are cooled by air using internal fans. Conventional air cooling is more than sufficient for the components with less thermal demand. Air …

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Performance Enhancement Of Raspberry Pi Server For The Application Of Oil Immersion Cooling, Dhaval Hitendra H Thakkar May 2016

Performance Enhancement Of Raspberry Pi Server For The Application Of Oil Immersion Cooling, Dhaval Hitendra H Thakkar

Mechanical and Aerospace Engineering Theses - Archive

The power consumed by Central Processing Unit (CPU) generates the heat which is undesirable and which is further responsible for the damage of Information Technology equipment. Oil Immersion cooling is one of the emerging technology which deals with the high server densities by submersing the servers in mineral oil. The study addresses the CFD analysis of Raspberry Pi computer servers with different cooling techniques and different modes of operating conditions. The thesis gives the explanation on the difference between air cooling and oil cooling with and without use of heat sinks. The study also shows the parametric analysis of heat …

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Parametric Cycle Analysis Of Adaptive Cycle Engine, Harinkumar Rajendrabhai Patel May 2016

Parametric Cycle Analysis Of Adaptive Cycle Engine, Harinkumar Rajendrabhai Patel

Mechanical and Aerospace Engineering Theses - Archive

One of the main area of research currently in air-breathing propulsion is increasing the fuel efficiency of engines. Increasing fuel efficiency of an air-breathing engine will be advantageous for civil transport as well as military aircraft. This objective can be achieved in several ways. Present design models are developed based on their uses: commercial transport, high range rescue aircraft, military aircraft. One of the main property of military aircraft is possessing high thrust but increasing fuel efficiency will also be advantageous resulting in more time in combat. Today's engine design operates best at their design point and has reduced thrust …

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Finite Element Based Weight Reduction Subject To Stability Constraints For An Airship Composite Duct, Soham M. Umbrajkar May 2016

Finite Element Based Weight Reduction Subject To Stability Constraints For An Airship Composite Duct, Soham M. Umbrajkar

Mechanical and Aerospace Engineering Theses - Archive

The primary functions of High Altitude Long Endurance (HALE) airships are persistent observation and wide area direct line of sight communication. Traditional airships have an ellipsoidal type hull, which is characterized by a large aspect ratio but results in an increase in the weight of the envelope. In order to reduce the weight of an airship, a hull having lower aspect ratio would be preferred. A novel unconventional airship design having a toroidal geometry with a propulsive duct running from the front end to back end was developed by Dancila in an attempt to achieve this objective. The propulsive duct …

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A Study Of Electrical Double Layer At An Aluminum Surface In An Automotive Cooling System, Saurabh Deobhankar May 2016

A Study Of Electrical Double Layer At An Aluminum Surface In An Automotive Cooling System, Saurabh Deobhankar

Mechanical and Aerospace Engineering Theses - Archive

Electrolytic corrosion is identified as a major problem which adversely affects the performance of a cooling system and hence compromises the performance of automobile with it. Electrolysis corrosion is a chemical reaction process that occurs between a metal surface and electrolyte. Mostly, the radiator tubes and tanks are made of aluminum with a high heat transfer rate. The coolant flows under pressure through the aluminum tubes, which gives rise to erosion-corrosion. The present thesis sheds light on the corrosion mechanism of Al 3003 alloy radiator tubes in contact with 50/50 ethylene glycol water coolant. The main objective is to understand …

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Cfd Modelling Of Wet Cooling Media And Design Optimization Of Heat Sink For Data Center Application, Shivang Yogeshkumar Desai May 2016

Cfd Modelling Of Wet Cooling Media And Design Optimization Of Heat Sink For Data Center Application, Shivang Yogeshkumar Desai

Mechanical and Aerospace Engineering Theses - Archive

Air cooling is most widely used and economical method of currently available cooling technologies in which heat exchanger plays a vital role in facility designs. Evaporative cooling can be energy efficient than mechanical cooling because it uses water’s enthalpy of vaporization. Wet cooling pads can be used as the direct evaporative cooling system in which pad is made of cellulose fibers those gets wet when water injected. When hot and dry air passes through pad surfaces, water evaporates in the air which cools down air adiabatically increasing humidity. These type of cooling units can be installed in these type of …

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