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2016

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Articles 4981 - 5010 of 9607

Full-Text Articles in Engineering

Design And Parametric Analysis Of Flow Control Device For Dynamic Cold Plate To Optimize The Temperature Fluctuations Of The Multi-Chip Module, Avinash Veluturla May 2016

Design And Parametric Analysis Of Flow Control Device For Dynamic Cold Plate To Optimize The Temperature Fluctuations Of The Multi-Chip Module, Avinash Veluturla

Mechanical and Aerospace Engineering Theses - Archive

Continuing trends of increasing microprocessor power densities and non-uniform temperature distribution pose a significant challenge to the data center cooling. The most usual approach to data center cooling is air cooling but there are certain limitations to that approach. Major limitation is heat transfer coefficient so in order to overcome those limitations, we came up with liquid cooling using water as coolant. To minimize energy consumption of cooling system the objective is to design a dynamic energy efficient and practical cooling solution for high power equipment. Multi-chip module is used as the base for the liquid cooling solution. The main …


Computational Analysis Of Impact Loading On Wafer Level Chip Scale Packages Mounted On Printed Circuit Boards Of Varying Thickness, Anik Mahmood May 2016

Computational Analysis Of Impact Loading On Wafer Level Chip Scale Packages Mounted On Printed Circuit Boards Of Varying Thickness, Anik Mahmood

Mechanical and Aerospace Engineering Theses - Archive

In the electronic industry one of the popular package is Chip Scale Package (CSP) due to its small form factor and low cost. To meet the need of new functionality and portability of the recent devices, CSPs’ have been most favorable choice for a long time. On the other hand, with the miniaturization process of these portable devices there is a growing risk of drop impact failure in day to day use. It’s not only the mechanical loading that is affecting the reliability of these devices but also thermal and thermo-mechanical loads are acting simultaneously. To analyze and ensure the …


Evaluation Of Cooling Architectures And Control Strategies In Airflow Provisioning A Modular Data Center, Jaykishankumar Kunjbihari Patel May 2016

Evaluation Of Cooling Architectures And Control Strategies In Airflow Provisioning A Modular Data Center, Jaykishankumar Kunjbihari Patel

Mechanical and Aerospace Engineering Theses - Archive

To achieve energy efficiency and reduce operational costs in data centers with modularized Information Technology and cooling infrastructure there is an ongoing trend to minimize the use of mechanical cooling and instead use outdoor air in favorable environmental conditions for cooling purposes. The cooling module can comprise of evaporative cooling systems which use direct, indirect or a combination of direct/indirect evaporative cooling units to provide adequate cooling. The degree of cooling achieved in the IT module depends on the effective airflow provisioned and the air distribution methods employed. In this study, a modular data center which is equipped with a …


Cfd Based Design And Optimization Of Louver Blade Angles To Enhance Better Air Flow Distribution And Improve Thermal Efficiency Of It Equipment In Data Centers, Avinash Kumar Ray May 2016

Cfd Based Design And Optimization Of Louver Blade Angles To Enhance Better Air Flow Distribution And Improve Thermal Efficiency Of It Equipment In Data Centers, Avinash Kumar Ray

Mechanical and Aerospace Engineering Theses - Archive

A data center is a depository which stores, processes and distribute large amounts of data and information using computer systems and associated components for power supplies, cooling systems. Modular data center is a portable method of deploying traditional large data center capacity into a small portable unit. According to the Uptime Institute, the amount of heat generated inside IT equipment has been increasing significantly. Data centers are using nearly 60% of their power in employing expensive cooling techniques. In addition, the cost of cooling has necessitated a need to reduce or eliminate mechanical cooling. As such, Air Economization, Direct and …


Development Of Paraffin Wax As A Phase Change Material For Thermal Management In Electronic Systems, Aditya Pinto May 2016

Development Of Paraffin Wax As A Phase Change Material For Thermal Management In Electronic Systems, Aditya Pinto

Mechanical and Aerospace Engineering Theses - Archive

Increasing development in electronic technologies has improved functionality and reduced physical constraints, while managing to impart higher power and performance in smaller and compact devices. As a result of this size reduction, there is also a reduction in the surface area required for heat dissipation. Due to this the thermal management problem has been further intensified. The end result is that the power density continues to rise even with improved thermal management strategies incorporated into the system. Thermal management hence plays an important aspect especially when the design of compact electronic devices is concerned. For most electronic applications thermal loads …


Design Consideration And Steady State Study Of Thrust Bearings In High Speed Subsonic Applications, Arvind Prabhakar May 2016

Design Consideration And Steady State Study Of Thrust Bearings In High Speed Subsonic Applications, Arvind Prabhakar

Mechanical and Aerospace Engineering Theses - Archive

Thrust bearings are required to perform at high speeds in various turbomachinery applications causing the nature of fluid flow within the bearings to be in high subsonic as well as supersonic regimes. The motivation of this research is to develop a bearing performance prediction model tailored for high subsonic speeds and large Reynolds numbers. The prime fluid characteristics studied in the thin film for predicting the bearing performance has been achieved by carefully considering inertial, viscous as well as compressible effects within the thin film fluid flow. Fluid inertia is a vital physical phenomenon that plays an important role in …


Computational Study And Error Analysis Of An Integrated Sampling-Probe And Gas-Analyzer For Mixing Measurements In Supersonic Flows, Wenbo Zhu May 2016

Computational Study And Error Analysis Of An Integrated Sampling-Probe And Gas-Analyzer For Mixing Measurements In Supersonic Flows, Wenbo Zhu

Mechanical and Aerospace Engineering Theses - Archive

Concentration probes are employed in supersonic flow mixing experiments for binary gas mixture composition measurements. These measurements are fundamental for the advancement of the scramjet technology. While non-intrusive laser-based methods (such as planar laser-induced fluorescence and filtered Rayleigh scattering) have been developed greatly over the past few decades, intrusive methods (such as concentration probes) still play an essential role in the measurement of mixture composition due to the fact that, with correct application, they do not require further assumptions on the aerothermodynamic states of the investigated mixture, which are often difficult to corroborate. Conversely, such assumptions are essential to the …


Investigation Of Additive Manufacturing Using Industrial Robots, Matt Heuser May 2016

Investigation Of Additive Manufacturing Using Industrial Robots, Matt Heuser

Mechanical and Aerospace Engineering Theses - Archive

Conventional additive manufacturing platforms are controlled using G-code, a numerical control language used to define the process parameters and move- ment of the print head. First, a digital model of the desired shape is created using 3-D computer graphics software. Then the model is analyzed by software tools that generate the necessary G-code instructions to be used by a 3-D printer to produce the desired object. The goal of this research is to lay the foundation and develop the necessary tools to 3-D print custom objects based on the viscous extrusion process using industrial robots. The first task is to …


Localized Immunotherapy Delivery Using Injectable In Situ Forming Chitosan Hydrogel, Seth Washispack May 2016

Localized Immunotherapy Delivery Using Injectable In Situ Forming Chitosan Hydrogel, Seth Washispack

Biomedical Engineering Undergraduate Honors Theses

Cytokine-based cancer immunotherapies stimulate a host’s immune system to fight cancer. In particular, interleukin-12 (IL-12), a potent pro-inflammatory cytokine, has demonstrated the ability to eliminate tumors in a number of preclinical models. Toxicities associated with the systemic delivery of IL-12 have precluded its use in the clinic. We are developing a novel chitosan-based hydrogel to maintain high local concentrations of cytokines, such as IL-12, in the tumor while minimizing its systemic dissemination. This hydrogel was found to form spontaneously within ten seconds of mixing two proprietary components. To increase the usefulness of the hydrogel, an efficient mixing and delivery system …


Computational Study Of Differential Capacitance-Double Layer Relationship In A Supercapacitor, Pranav Milind Phadtare May 2016

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, Trina Barua May 2016

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 …


Chitosan As An Antiviral, Tayler Pauls May 2016

Chitosan As An Antiviral, Tayler Pauls

Biomedical Engineering Undergraduate Honors Theses

There is no broad-based antiviral medication available today; there are specific antivirals, for example, the antiretroviral for HIV. However, these specific antivirals are not available in each country and can be problematic for specific patients. Chitosan is proposed as a possible broad-based antiviral, which has already demonstrated antibacterial properties, antiviral properties in plants, is used for wound healing and as a hydrogel among other medical applications. The methods used are transfection of NIH-3T3 cells with GFP-adenovirus with 0.1%, 0.5%, and 1% chitosan added to virus prior to transfection. Fluorescence microscopy and flow cytometry data has validated that the use of …


Determining The Effect Of Delivery Rate On Glucose Uptake By Cancer Cells, Luke Felton May 2016

Determining The Effect Of Delivery Rate On Glucose Uptake By Cancer Cells, Luke Felton

Biomedical Engineering Undergraduate Honors Theses

Radiation therapy is one of the most commonly performed cancer treatment therapies today. Radiation therapy can cause can changes to tumor vasculature and affect blood flow rates. It is important to determine how changes in blood flow rates affect tumor glycolytic uptake to better understand tumor response to radiation therapy (1). The goal of this study was to use a fluorescent analog of glucose, 2-NBDG, to study the effect of varying flow rates on glucose uptake. A microfluidic device was constructed to flow 2-NBDG through. A murine metastatic breast cancer cell line was then cultured inside this microfluidic channel, and …


Determining Intruder Aircraft Position Using Series Of Stereoscopic 2-D Images, Aditya Ramani May 2016

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, Vimalan Adaikalanathan May 2016

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, Yasir Aziz Modak May 2016

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, Sumanth Krishnamurthy May 2016

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, Brady C. Lotz May 2016

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, Parth Jayeshkumar Soni May 2016

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, Abhishek Guhe May 2016

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, Neha Inamdar May 2016

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, Pratik Babanrao Kale May 2016

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 …


Synthesis And Characterization Of Plasmonic-Magnetic Au-Co Multilayered Nanorods, Akshay Hande May 2016

Synthesis And Characterization Of Plasmonic-Magnetic Au-Co Multilayered Nanorods, Akshay Hande

Material Science and Engineering Theses - Archive

Au nanoparticles (AuNPs) and superparamagnetic iron oxide nanoparticles (SPIONs), in various forms, are considered as biocompatible and are of great interest for diagnostic imaging and therapeutic applications. Biomedical applications of AuNPs originate from the surface plasmon resonance (SPR) effect. In order to tune the SPR wavelength to the near infrared (NIR) region which is required for deep light penetration for in vivo applications, various types of AuNPs such as nanorods, nanoprisms, nanoshells and nanocages have been developed and investigated. SPIONs have also been explored extensively for biomedical applications, including magnetic cell separation, contrast enhancement agents for magnetic resonance imaging (MRI), …


An Actomyosin Driven, Pressure Based Adhesion Model Of Confined Glioblastoma Multiforme Cell Migration, Jamie Wright May 2016

An Actomyosin Driven, Pressure Based Adhesion Model Of Confined Glioblastoma Multiforme Cell Migration, Jamie Wright

Bioengineering Dissertations - Archive

Glioblastoma multiforme (GBM) is the most aggressive and common form of glial tumors arising in the support cells of the brain. Cell migration plays a critical role in undermining the surgical resection of tumors. Peripheral cells freely detach and invade the surrounding tissue, preferentially collecting and migrating within confined, mechanically distinct environments such as along the borders of white matter tracts and vasculature. These tracks have been mimicked experimentally using small, rectangular PDMS micro-channels. GBM cells will readily enter and migrate through these micro-channels in the absence of any chemoattractant, even without specific cell-substrate adhesion (integrins) if channel dimensions decrease …


Interactive Analytical Tool For Quantitative Corneal Confocal Imaging In Vivo, Madhavi Tippani May 2016

Interactive Analytical Tool For Quantitative Corneal Confocal Imaging In Vivo, Madhavi Tippani

Bioengineering Theses - Archive

The objective of this study was to develop an interactive software application for image reconstruction and analysis of the corneal data from an in vivo confocal microscope (Heidelberg Retinal Tomograph with Rostock Corneal Module, HRT-RCM). The optical sectioning ability of confocal microscopy gives high resolution optical section images at different depths within a thick tissue, thereby eliminating the need for physical sectioning. This ability of 4-dimensional (x,y,z and t) imaging makes confocal microscopy uniquely suited for imaging the cornea at the cellular level. The new program was developed to overcome the drawbacks of the original application “Confo” developed in the …


Computer Vision Algorithm Development And Biomedical Applications, Vasant Kearney May 2016

Computer Vision Algorithm Development And Biomedical Applications, Vasant Kearney

Bioengineering Dissertations - Archive

Supervising Professor: Liping Tang and Weihua Mao This study focuses on the development and analysis of novel computer vision algorithms for biomedical applications. Chapter 2 focuses on developing a 2D Canny edge-based DIR algorithm to register in vivo white light images taken at various time points. Using a mouse model, the accuracy of the canny edge-based DIR algorithm was tested using evaluation metrics, a ground truth synthetic scenario, and fluorescent gamma analysis. The results indicate that the Canny edge-based DIR algorithm performs better than all other algorithms. Chapter 3 focuses on the development of a novel longitudinal fluorescent signal tracking …


Strengthening Of Lightweight Reinforced Concrete Beams Using Carbon Fiber Reinforced Polymers (Cfrp), Tariq Al Jaafreh May 2016

Strengthening Of Lightweight Reinforced Concrete Beams Using Carbon Fiber Reinforced Polymers (Cfrp), Tariq Al Jaafreh

Civil Engineering Theses - Archive

This research aimed to investigate the effect of utilizing “Fiber Reinforced Polymer” (FRP) on the light weight concrete beams. The main hypothesis is that such utilization of the FRP will lead to strengthened lightweight beams. The research that has been done on this relationship is somewhat broad in the scope and have mostly focused on the normal-weight concrete. However, only few studies that have considered the light weight concrete. Eight Beams were tested in this research under four point bending test. Two beams were taken as a control beams without any external bonding of Carbon Fiber Reinforced polymer. Another two …


Comparison Of Methane Production From Household Waste, Sunita Baniya May 2016

Comparison Of Methane Production From Household Waste, Sunita Baniya

Civil Engineering Theses - Archive

Anaerobic digestion is a biochemical process in which various microorganisms transform complex organic compounds to methane, along with carbon dioxide, water vapor and a small amount of other trace gases in absence of oxygen. Methane from anaerobic digestion processes is being increasingly utilized as an alternative energy source in developing as well as developed countries. These days the energy crisis is very acute in rural communities of developing countries, where fuelwood has been and still is the major source of daily used fuel. Through anaerobic digestion, clean-burning fuel for cooking can be produced from degradation of household organic wastes, solving …


Impact Of Weather Factors On Go-Around Occurrence, Bharath Donavalli May 2016

Impact Of Weather Factors On Go-Around Occurrence, Bharath Donavalli

Civil Engineering Theses - Archive

A “go-around” occurs when an aircraft, which is on final approach, aborts it landing due to unsatisfactory conditions. Go-arounds have a significant impact on the capacity of the airports and pose a serious concern at large airports, especially for airports with diagonal runways. Go-arounds occur due to manual errors, mechanical faults and weather factors. This study focuses on the impact of weather factors on go-around occurrence. The study includes wind gust, storm events (thunderstorm, rain and snow) and visibility as the weather factors under investigation. The author uses a factorial sampling strategy where these factors are segmented into additional categories …


A Small Acoustic Goniometer For General Purpose Research, Michael L. Pook, Sin Ming Loo May 2016

A Small Acoustic Goniometer For General Purpose Research, Michael L. Pook, Sin Ming Loo

Electrical and Computer Engineering Faculty Publications and Presentations

Understanding acoustic events and monitoring their occurrence is a useful aspect of many research projects. In particular, acoustic goniometry allows researchers to determine the source of an event based solely on the sound it produces. The vast majority of acoustic goniometry research projects used custom hardware targeted to the specific application under test. Unfortunately, due to the wide range of sensing applications, a flexible general purpose hardware/firmware system does not exist for this purpose. This article focuses on the development of such a system which encourages the continued exploration of general purpose hardware/firmware and lowers barriers to research in projects …