Computational Study Of Differential Capacitance-Double Layer Relationship In A Supercapacitor,
2016
University of Texas at Arlington
Computational Study Of Differential Capacitance-Double Layer Relationship In A Supercapacitor, Pranav Milind Phadtare
Mechanical and Aerospace Engineering Theses - Archive
Energy crisis is one of the most pressing problems that the world is facing. It involves a number of issues to be addressed in energy sources, transportation, storage, etc. Novel ways of energy storage are being actively explored. Electrical energy is stored by using devices such as batteries, capacitors, supercapacitors, etc. Supercapacitor seems to be a promising technology for this purpose. Traditionally, batteries have high energy densities but low power delivering density. On the other hand, conventional capacitors are capable of delivering high power densities but possess low energy storage density. Supercapacitors are a bridge between the two devices. Of …
A Comparative Study Of The Thermo-Mechanical Behavior Of Wcsp Assembly Due To Difference In Pcbs’ Layer Thickness,
2016
University of Texas at Arlington
A Comparative Study Of The Thermo-Mechanical Behavior Of Wcsp Assembly Due To Difference In Pcbs’ Layer Thickness, Trina Barua
Mechanical and Aerospace Engineering Theses - Archive
The reliability of Chip Scale Package assembly is of great concern for the electronic industry. Due to multiple function integration of the present devices there is a high demand of ultra-miniaturization of the integrated parts to build the inside circuit assembly. Wafer Level Chip Scale Packages (WLCSP) are used in the industry to meet the challenges of these miniaturization due to its form factor, not so high cost and packaging efficiency which is also very high despite the known and unknown reliability issues. WLSCPs use packaging technology at the wafer level which is an extension of the wafer fab process …
Determining Intruder Aircraft Position Using Series Of Stereoscopic 2-D Images,
2016
University of Texas at Arlington
Determining Intruder Aircraft Position Using Series Of Stereoscopic 2-D Images, Aditya Ramani
Mechanical and Aerospace Engineering Theses - Archive
Introduction of UAV (Unmanned Aerial Vehicles) into the NAS (National Air Space) requires the detect-and-avoid capability. That is, an aircraft should be able to detect other aircraft flying in the same airspace volume and make evasive maneuvers if there is potential conflict. One potential methods currently investigated for detection of an intruder aircraft is to process digital images taken by onboard cameras. When and if intruder aircraft detection is successful through image processing, avoidance algorithms can greatly benefit from the relative position information. This thesis research investigates methods to compute the position of an intruder aircraft relative to an observer …
Numerical Study On Morphology And Solidification Characteristics Of Successive Droplet Depositions On A Substrate,
2016
University of Texas at Arlington
Numerical Study On Morphology And Solidification Characteristics Of Successive Droplet Depositions On A Substrate, Vimalan Adaikalanathan
Mechanical and Aerospace Engineering Theses - Archive
Successive droplet impingement finds extensive applications in additive manufacturing technologies such as 3D printing, Liquid Metal Jetting and Net Form Manufacturing. Deposition, deformation and solidification of droplets are the constitutive stages in the process which determine the final outcome. Detailed knowledge about the flow behaviour, phase transformation and free surface deformation is required to have a complete understanding and optimization of the process parameters. Experimental research in this field is only limited to imaging techniques and post solidification analysis which only provide superficial information while overlooking most of the governing phenomenon. Knowledge of the physics governing the fluid and thermal …
Cfd Analysis Of Vapor Chamber With Micro Pillars As Heat Spreader For High Power Electronic Devices,
2016
University of Texas at Arlington
Cfd Analysis Of Vapor Chamber With Micro Pillars As Heat Spreader For High Power Electronic Devices, Yasir Aziz Modak
Mechanical and Aerospace Engineering Theses - Archive
The recent trend in electronic industry shows that there is large power dissipation from the electronic devices and at the same time their sizes are getting smaller. This large power dissipation takes place in the form of releasing heat energy. It is observed that heat dissipation from the electronic devices is high and source size is small. The high device temperatures result in decreased reliability and increased failure rates. This difficulty can be addressed by controlling the temperatures at the source of heat generation. In chip scale package chip is the major source of heat generation. Thus our priority is …
Experimental And Computational Board Level Reliability Assessment Of Thick Board Qfn Assemblies Under Power Cycling,
2016
University of Texas at Arlington
Experimental And Computational Board Level Reliability Assessment Of Thick Board Qfn Assemblies Under Power Cycling, Sumanth Krishnamurthy
Mechanical and Aerospace Engineering Theses - Archive
Quad Flat No-Lead Package (QFN) is one of the latest cutting edge technologies that took the industry by storm due to its excellent electrical and thermal performance, compact size and low cost. Due to its compact size, QFN package is an ideal choice for handheld portable applications and where package performance is required. In QFN packages, the electrical contact to the Printed Circuit Board (PCB) is made through soldering of the lands underneath the package body rather than the traditional leads formed along the perimeter. However, using thick PCBs can be detrimental to the reliability of the package. The motivation …
Effect Of Structural Variations On Thermal Deformation Of Single Curvature Composite Sandwich Panels,
2016
University of Texas at Arlington
Effect Of Structural Variations On Thermal Deformation Of Single Curvature Composite Sandwich Panels, Brady C. Lotz
Mechanical and Aerospace Engineering Theses - Archive
Composite structures cured at a high temperature in a contoured female mold have a tendency to deform or spring-in when brought down to room temperature from cure temperature. This thesis investigates the effects of various structural parameters on the spring-in of the curved shape of a composite sandwich panel due to thermal deformation. A finite element model of a single curved composite sandwich panel is developed using 3D shell elements and validated against other published articles and classical lamination theory. Using a control structure of AS4/3501-6 carbon/epoxy with half inch Nomex honeycomb core with a layup of [0°/90°/0°/90°/Core/90°/0°/90°/0°]T, structural parameters …
Performance Evaluation Of Plate-Fin And Pin-Fin Heat Sinks For The Application Of Oil Immersion Cooling And Design Optimization Of Dynamic Cold Plate For The Application Of Warm Water Cooling,
2016
University of Texas at Arlington
Performance Evaluation Of Plate-Fin And Pin-Fin Heat Sinks For The Application Of Oil Immersion Cooling And Design Optimization Of Dynamic Cold Plate For The Application Of Warm Water Cooling, Parth Jayeshkumar Soni
Mechanical and Aerospace Engineering Theses - Archive
In IT industries, to keep server rooms and data centers cool is a constant challenge for hardware developers and the cooling solution providers. Air cooling is the most widely used approach for thermal management of servers in data centers from many years. However, the scenario is changing gradually as the computational ability of data center is increasing exponentially. Because of increasing computational ability, the heat generated by the servers is increased in such amount that air cooling is not as efficient as it was before. Hence, alternative cooling system is required. In 1970’s the idea of liquid cooling was introduced. …
Control Strategies For Air-Side Economization, Direct And Indirect Evaporative Cooling And Artificial Neural Networks Applications For Energy Efficient Data Centers,
2016
University of Texas at Arlington
Control Strategies For Air-Side Economization, Direct And Indirect Evaporative Cooling And Artificial Neural Networks Applications For Energy Efficient Data Centers, Abhishek Guhe
Mechanical and Aerospace Engineering Theses - Archive
The skyrocketing growth in data centers, facilities that house information technology (IT) equipment for storage, management and distribution of data while striving for 24/7/365 operation with 100% up-time, has accounted for 1.3% of global energy use. A significant portion of data center energy is dedicated to removing the heat generated by IT equipment to maintain safe operating conditions and optimum computing performance. Energy efficient cooling of data center is of vital importance. One of the options for significantly cutting the cooling cost is the use of air side economization (ASE), Indirect evaporative cooling (IEC) and Direct evaporative cooling (DEC) without …
Optimization Of Air Cooled Portion In A Server With Water Cooled Micro-Processors,
2016
University of Texas at Arlington
Optimization Of Air Cooled Portion In A Server With Water Cooled Micro-Processors, Neha Inamdar
Mechanical and Aerospace Engineering Theses - Archive
A Data center is the heart of our associated world. It is a facility that houses computer systems and related components. According to IDC, because of enormous increment in pattern of IoT (Internet of Things) and distributed computing the introduced limit of server farm workloads will increment by around 750% around 2014 and 2019. Data center spaces can consume up to 100 to 200 times as much power as standard office spaces. With such huge influence utilization, they are prime focuses for vitality proficient outline measures that can spare cash and lessen power use. In a regular Data center with …
A Study Of Electrical Double Layer Structure Over A Corroding Steel Surface In Sea Water,
2016
University of Texas at Arlington
A Study Of Electrical Double Layer Structure Over A Corroding Steel Surface In Sea Water, Pratik Babanrao Kale
Mechanical and Aerospace Engineering Theses - Archive
Corrosion is a natural deterioration phenomenon that throws profound adverse effects on the performance of structural steel in marine applications. Seawater consists of various corrosive components such as chlorine ions, sulphate ions and many more. These chemical components are mainly responsible for the corrosion phenomenon. Even though their bulk concentrations are known, their local concentrations and distribution in the vicinity of a steel surface where the corrosion occurs are yet unclear. Without the knowledge, would any approach to deal with the corrosion be empirical, at best. The main objective of the present thesis is to investigate the interfacial structure of …
Time-Of-Flight Based Sonic Speed Measurements For Cold Gas Thruster Development,
2016
University of Arkansas, Fayetteville
Time-Of-Flight Based Sonic Speed Measurements For Cold Gas Thruster Development, Brandon W. Kempf
Mechanical Engineering Undergraduate Honors Theses
The purpose of this thesis is to explore an experiment developed for validating the usage of a gaseous solution of water and propylene glycol for cold gas propulsion. The experiment involves a “Time of Flight” method of calculating the speed of sound in the gas and the corresponding specific heat ratio using a copper tube, two MEMS microphones, a piezoelectric speaker, and data-acquisition hardware. The experiment was calibrated using the known thermodynamic properties of air. The accuracy of the experiment was found to be within 0.6% for calculations of the speed of sound in air and within 1.0% of the …
Three-Dimensional Simulation For Fast Forward Flight Of A Calliope Hummingbird,
2016
Vanderbilt University
Three-Dimensional Simulation For Fast Forward Flight Of A Calliope Hummingbird, Jialei Song, Bret W. Tobalske, Don Powers, Tyson Hedrick, Haoxiang Luo
Faculty Publications - Department of Biological & Molecular Science
We present a computational study of flapping-wing aerodynamics of a calliope hummingbird (Selasphorus calliope) during fast forward flight. Three-dimensional wing kinematics were incorporated into the model by extracting time-dependent wing position from high-speed videos of the bird flying in a wind tunnel at 8.3 m s−1. The advance ratio, i.e. the ratio between flight speed and average wingtip speed, is around one. An immersed-boundary method was used to simulate flow around the wings and bird body. The result shows that both downstroke and upstroke in a wingbeat cycle produce significant thrust for the bird to overcome …
Analysis Of An Artificial Tailplane Icing Flight Test Of A High-Wing, Twin-Engine Aircraft,
2016
University of Texas at Arlington
Analysis Of An Artificial Tailplane Icing Flight Test Of A High-Wing, Twin-Engine Aircraft, Shehzad Maksudahmad Shaikh
Mechanical and Aerospace Engineering Theses - Archive
The US Air Force Flight Test Center (AFFTC) conducted a civilian, Federal Aviation Administration (FAA) sponsored, evaluation of tailplane icing of a twin-turboprop business transport at Edwards Air Force Base. The flight test was conducted to evaluate ice shape growth and extent of ice on the tailplane for specific weather conditions of Liquid Water Content (LWC), droplet size, and ambient temperature. This work analyzes the flight test data comparing the drag for various tailplane icing conditions with respect to a flight test verified calibrated aircraft model. Although less than a third of the test aircraft was involved in the icing …
A Mesh Based Boom To Stop Oil Spread,
2016
University of Texas at Arlington
A Mesh Based Boom To Stop Oil Spread, Bharathram Visweswaran
Mechanical and Aerospace Engineering Theses - Archive
In this work, we develop a new boom to separate oil and water. In a commonly used boom, a membrane that has no pores is normally used to block oil spread. Since this membrane also blocks water flow, high pressure is easy to build on such a membrane to break or damage it. To solve this problem, in the new boom, the membrane is replaced with a hydrogel-coated mesh. The hydrogel-coated mesh has dual properties of superhydrophilicity and superoleophobicity. Accordingly, water can still go through the mesh, while oil cannot. Subsequently, liquid pressure on the mesh is reduced. In this …
Analysis Of Electric Double Layer Structure Formed During Corrosion Of Steel Pipes Carrying Potable Water,
2016
University of Texas at Arlington
Analysis Of Electric Double Layer Structure Formed During Corrosion Of Steel Pipes Carrying Potable Water, Tanmay Sanjeev Gupte
Mechanical and Aerospace Engineering Theses - Archive
Corrosion of steel pipes carrying drinking water is a universal issue. It affects human health as the corrosion sediments in these pipes can be toxic and unfit for consumption. Further, the amassing of the corrosion products can lead to operational difficulties. Drinking water consists of anions like carbonate, hydroxides and chloride ions which are responsible for the corrosion process. In such types of aqueous corrosion, there is an interfacial region formed between the corroding metal and the bulk of the aqueous environment. This interfacial region is called the Electrical Double Layer. In this article, we direct to study the effects …
Reliability Challenges In Airside Economization And Oil Immersion Cooling,
2016
University of Texas at Arlington
Reliability Challenges In Airside Economization And Oil Immersion Cooling, Jimil Manojbhai Shah
Mechanical and Aerospace Engineering Theses - Archive
The Datacom facility which comprises rooms or closets used for communication, computers/servers or electronic equipment requires cooling unit which consumes 31% (23% HVAC cooling + 8% HVAC fans) of overall energy. The ASHRAE TC9.9 subcommittee, on Mission Critical Facilities, Data Centers, Technology Spaces, and Electronic Equipment, has suited the data center’s executives by permitting brief period outings of the environmental conditions outside the prescribed temperature-humidity range, into passable extents A1-A4. To comprehend the expanding server densities and the required cooling vitality costs, data center operators are falling back on cost cutting measures. For instance, they are not firmly controlling the …
Harvesting Of Water From Fog Using Sponges,
2016
University of Texas at Arlington
Harvesting Of Water From Fog Using Sponges, Jae Jun Lee
Mechanical and Aerospace Engineering Theses - Archive
Supervising Professor: Cheng Luo A sponge has porous structures. It is capable of both storing and transmitting water. In this work, we explored the possibility of applying three different types of sponges to collect fog. We also compared their fog-collection efficiencies with that of a typical Raschel mesh that is widely used in the field to collect fog. We found that, for three different fog speeds, the fog-collection efficiencies of three tested sponges were 39% to 93% those of the typical Raschel mesh, indicating that the sponges could serve as alternative fog collectors when well-developed collectors were not available. Sponge …
Investigating The Effect Of Capping Layers On Final Thin Film Morphology After A Dewetting Process,
2016
Utah State University
Investigating The Effect Of Capping Layers On Final Thin Film Morphology After A Dewetting Process, Benjamin C. White
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Nanoparticles on a substrate have numerous applications in nanotechnology, from enhancements to solar cell efficiency to improvements in carbon nanotube growth. Producing nanoparticles in a cheap fashion with some control over size and spacing is difficult to do, but desired. This work presents a novel method for altering the size and spacing of nickel and gold nanoparticles. Dewetting is a methodology to reduce thin films to an ensemble of discrete droplets. The introduction of alumina capping layers to thin nickel films during a pulsed laser-induced dewetting process has yielded reductions in the mean and standard deviation of radii and pitch …
A Cross-Sectional And Mixed-Method Assessment Of Safety Culture And Safety Climate At A Regional Airline,
2016
Purdue University
A Cross-Sectional And Mixed-Method Assessment Of Safety Culture And Safety Climate At A Regional Airline, Micah S. Walala
Open Access Dissertations
The researcher applied a mixed methods approach to conduct a cross-sectional assessment of the safety culture, safety climate, and SMS at a regional airline in the United States. Data collection techniques were comprised of interview, on-line-survey, and a focus group activity. Participants in the current study were maintenance technicians, flight attendants, dispatchers, pilots, and managers. Results indicated significant differences of perception of safety climate, safety culture, and Safety Management System between the maintenance technicians and flight attendants. The length of time a participant had worked at the subject airline and age of the participant appeared to be significant factors of …
