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2017

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Portable Wireless Antenna Sensor For Simultaneous Shear And Pressure Monitoring, Farnaz Farahanipad Dec 2017

Portable Wireless Antenna Sensor For Simultaneous Shear And Pressure Monitoring, Farnaz Farahanipad

Computer Science and Engineering Theses - Archive

Microstrip antenna-sensor has received considerable interests in recent years due to its simple configuration, compact size, and multi-modality sensitivity. Having a simple and conformal planar configuration, antenna-sensor can be easily attached on the structure surface for Structure Health Monitoring (SHM). As a promising sensor, the resonant frequency of the antenna-sensor is sensitive to different structure properties: such as planar stress, temperature, moisture, pressure and shear. As a passive antenna, antenna-sensor’s resonant frequency can be wirelessly interrogated at a middle range distance without using an on-board battery. However, a major challenge of antenna-sensor’s wireless interrogation is to isolate the antenna backscattering …

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Social Coding Standards On Touchdevelop: An Empirical Study, Shivangi Kulshrestha Dec 2017

Social Coding Standards On Touchdevelop: An Empirical Study, Shivangi Kulshrestha

Computer Science and Engineering Theses - Archive

This study compares and contrasts the application development pattern on Microsoft’s mobile application development platform with leading version control and social coding sites like Github. TouchDevelop is an in-browser editor for developing mobile applications with the main aim to concentrate on ‘touch’ as the only input. Apart from being the first of it’s kind platform, TouchDevelop also allows users to upload their script directly to cloud. This is what makes this study interesting, since the API data of the app has never been studied before to follow social coding standards or version control techniques. Till today, all major IDEs, e.g …

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Maximizing Code Coverage In Database Applications, Tulsi Chandwani Dec 2017

Maximizing Code Coverage In Database Applications, Tulsi Chandwani

Computer Science and Engineering Theses - Archive

A database application takes input as user-defined queries and determines the program logic to be executed based on the results returned by the queries. A change in existing application or a new application is expected pass through extensive testing to cover the entire code and check all the cases possible in execution. Testing the code coverage of traditional or CRUD-based applications is a straightforward process backed by various tools and libraries. Unlike traditional applications, checking the code coverage of database applications is a complex procedure due to its inherent structure and the inputs passed to it. Measuring the code coverage …

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Visual Logging Framework Using Elk Stack, Ravi Nishant Dec 2017

Visual Logging Framework Using Elk Stack, Ravi Nishant

Computer Science and Engineering Theses - Archive

Logging is the process of storing information for future reference and audit purposes. In software applications, logging plays a very critical role as a development utility and ensures code quality. It acts as an enabler for developers and support professionals by providing them capability to see application’s functionality and understand any issues with it. Data logging has a widespread use in scientific experiments and analytical systems. Major systems which heavily uses data logging are weather reporting services, digital advertisement, search engines, space exploration systems to name a few. Although, data logging increases the productivity and efficiency of a software system, …

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Igait: Vision-Based Low-Cost, Reliable Machine Learning Framework For Gait Abnormality Detection, Saif Sayed Dec 2017

Igait: Vision-Based Low-Cost, Reliable Machine Learning Framework For Gait Abnormality Detection, Saif Sayed

Computer Science and Engineering Theses - Archive

Human gait has shown to be a strong indicator of health issues under a wide variety of conditions. For that reason, gait analysis has become a powerful tool for clinicians to assess functional limitations due to neurological or orthopedic conditions that are reflected in gait. Therefore, accurate gait monitoring and analysis methods have found a wide range of applications from diagnosis to treatment and rehabilitation. This thesis focuses on creating a low-cost and non-intrusive vision-based machine learning framework dubbed as iGait to accurately detect CLBP patients using 3-D capturing devices such as MS Kinect. To analyze the performance of the …

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Rotordynamic Enhancement By Utilizing The Controlled Hydrostatic Injection Of Hybrid Air Foil Bearing, Behzad Zamanian Yazdi Dec 2017

Rotordynamic Enhancement By Utilizing The Controlled Hydrostatic Injection Of Hybrid Air Foil Bearing, Behzad Zamanian Yazdi

Mechanical and Aerospace Engineering Dissertations - Archive

Air foil bearings (AFBs) are introduced as promising bearings for oil-free turbomachinery applications. Air foil bearing (AFB) technology has made substantial advancement during the past decades and found its applications in various small turbomachinery. AFBs provide reliable operation at high speed and high temperature with negligible power loss. However, rotordynamic instability, friction and drag during the start/stop, and thermal management are still challenges for further application of the technology. Hybrid Air Foil Bearing (HAFB) technology utilizes the radial injection of externally pressurized air into the traditional hydrodynamic AFB’s film thickness through orifices attached to the top foil. HAFB is one …

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Optimization Of Aircraft Tow Steered Composite Wing Structures, Micheal Chamberlain Henson Dec 2017

Optimization Of Aircraft Tow Steered Composite Wing Structures, Micheal Chamberlain Henson

Mechanical and Aerospace Engineering Dissertations - Archive

An efficient methodology for design of aircraft composite wing structures is presented. The developed approach provides a flexible and integrated strategy to leverage advantages of composite material tow steering to achieve more effective wing designs. This is accomplished by including the coupling between OML geometry, aerodynamics and structural response. Structural and aerodynamic analyses are derived from parametric aircraft geometry and assembled into a framework for aero-structural wing sizing. A Ritz equivalent plate solution is extended to model composite materials with variable fiber path geometry. The structural modeling approach is implemented to automate creation of both Ritz and finite element analyses. …

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A Micromechnics Approach To Predicting The Onset Yielding Envelope Of Particulate Composite Materials, Behrooz Karimi Dec 2017

A Micromechnics Approach To Predicting The Onset Yielding Envelope Of Particulate Composite Materials, Behrooz Karimi

Mechanical and Aerospace Engineering Dissertations - Archive

Composite materials fail for various reasons and extensive research has been conducted both experimentally and theoretically. However, theoretical prediction of composite failure by yielding seems scarce. Adding reinforcing elements to matrix significantly affects the structural behavior of composite materials. The inserted particles on one hand obstruct the progress of cracks and on the other hand cause stress concentration on the interface of the particle-matrix and eventually influence the ultimate strength of the material. In this research, we study the interface stresses and strength in particulate reinforced composites under uniform mechanical and thermal loading. We theoretically obtain failure envelopes for particulate …

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Towards The Fabrication Of Bioresorbable Constructs With Customized Properties Using Additive Manufacturing, Prashanth Ravi Dec 2017

Towards The Fabrication Of Bioresorbable Constructs With Customized Properties Using Additive Manufacturing, Prashanth Ravi

Mechanical and Aerospace Engineering Dissertations - Archive

Additive Manufacturing (AM) has been employed to fabricate medical constructs for over two decades. This dissertation investigates the effects of AM process parameters on raster level geometric features and structural properties of bioresorbable constructs. The development of an open architecture custom multi-process 3D printer employed for fabricating bioscaffolds and test structures is discussed. Bioresorbable polymers including a newly synthesized radiopaque polymer, poly (glycerol sebacate fumarate) gadodiamide (Rylar) and medical grade poly-L-lactic acid (PLLA) were investigated. In the first part, the effects of process parameters on raster geometry were investigated to aid in the fabrication of structures with improved geometric features …

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Numerical Study Of Droplet Evaporation, Ritul Gandhi Dec 2017

Numerical Study Of Droplet Evaporation, Ritul Gandhi

Mechanical and Aerospace Engineering Theses - Archive

Droplet evaporation plays a vital role in various engineering fields such as air/fuel premixing, inkjet printing and many more. The high rate of power dissipation from the integrated circuits and chips of electronic devices creates a need for cooling it to achieve their optimal functionality. The high rate of cooling can be achieved by thin film evaporation of water by phase change as compared to the air cooling methods. Therefore, the study of droplet evaporation is necessary to understand the underlying physics and effects of different parameters on cooling performance. Numerical study of droplet evaporation has been done by using …

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Space Launch Vehicle Design: Conceptual Design Of Rocket Powered, Vertical Takeoff, Fully Expendable And First Stage Boostback Space Launch Vehicles, David Michael Woodward Dec 2017

Space Launch Vehicle Design: Conceptual Design Of Rocket Powered, Vertical Takeoff, Fully Expendable And First Stage Boostback Space Launch Vehicles, David Michael Woodward

Mechanical and Aerospace Engineering Theses - Archive

Engineering design can be broken down into three phases: conceptual design, preliminary design, and detailed design. During the conceptual design phase, several potential configurations are studied towards the identification of the baseline vehicle. Although the least amount of detail is known about the design during the early conceptual design phase, the decisions made during this phase lock in major features effecting life-cycle cost and overall product success. As the next big space race begins, it is critically important to have a readily available tool for launch vehicle designers that is intuitive to use, easy to modify, cost effective, and provides …

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A Methodology For Topology And Lattice Structure Optimization Of A Cargo Drone Motor Mount, Nagadurga Srinivas Sripada Dec 2017

A Methodology For Topology And Lattice Structure Optimization Of A Cargo Drone Motor Mount, Nagadurga Srinivas Sripada

Mechanical and Aerospace Engineering Theses - Archive

This work discusses a CAE driven methodology for designing a lightweight component by performing structural configuration on a given package space, creating a closed surface along this configuration using an interactive geometric modeling tool, and lastly generating lattice members that provide the required stiffness for the structure. The design process is explained starting with topology optimization performed on a single block with specific design constraints. It describes the effect of different parameters on the optimized results and how to analyze these results based on a given volume fraction constraint with the objective of minimizing the compliance. It then talks about …

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Region Based Convolutional Neural Networks For Object Detection And Recognition In Adas Application, Sachit Kaul Dec 2017

Region Based Convolutional Neural Networks For Object Detection And Recognition In Adas Application, Sachit Kaul

Mechanical and Aerospace Engineering Theses - Archive

Object Detection and Recognition using Computer Vision has been a very interesting and a challenging field of study from past three decades. Recent advancements in Deep Learning and as well as increase in computational power has reignited the interest of researchers in this field in last decade. Implementing Machine Learning and Computer Vision techniques in scene classification and object localization particularly for automated driving purpose has been a topic of discussion in last half decade and we have seen some brilliant advancements in recent times as self-driving cars are becoming a reality. In this thesis we focus on Region based …

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The Design And Linearization Of Flow Control Device And Pressure Forces On Valve, Penchala Sumanth Reddy Challa Dec 2017

The Design And Linearization Of Flow Control Device And Pressure Forces On Valve, Penchala Sumanth Reddy Challa

Mechanical and Aerospace Engineering Theses - Archive

Emerging technologies are pushing the limits by reducing the size of the nodes, raising the heat densities of packages thereby demanding better thermal management. The cooling power requirement increases drastically when air is used as the cooling medium in high power density servers as air has a low heat transfer coefficient. Very viable replacements for air as the cooling medium are water and oil. Oil is not as widely used as it has its own disadvantages when compared to water. Water has appreciably higher heat transfer coefficient, which helps it to remove heat from the server at a much faster …

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Computational Model For Steady State Simulation Of A Solid Oxide Fuel Cell (Sofc) Planar Stack Model Undergoing Reforming Process, Vaibhav Vijay Indulkar Dec 2017

Computational Model For Steady State Simulation Of A Solid Oxide Fuel Cell (Sofc) Planar Stack Model Undergoing Reforming Process, Vaibhav Vijay Indulkar

Mechanical and Aerospace Engineering Theses - Archive

Solid Oxide Fuel Cell (SOFC), is a clean and low-pollution technology of generating power of high efficiency. Its applicability for both stationery and transportation power generation systems, adaptability for wide range fuel sources, as wells its process of direct conversion of fuel to energy make it an important source of power generation. An effective design of sub-systems or individual components play a key role in overall working of a plant. Thus, critical analysis at the component level is of importance for the overall plant efficiency. In the present study a heat transfer model of a planar SOFC stack to be …

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Reliability Assessment Of Solder Joint Using Bga Package – Megtron 6 Versus Fr4 Printed Circuit Boards Using Drop Testing, Pradnya Chandrakant Mundhe Dec 2017

Reliability Assessment Of Solder Joint Using Bga Package – Megtron 6 Versus Fr4 Printed Circuit Boards Using Drop Testing, Pradnya Chandrakant Mundhe

Mechanical and Aerospace Engineering Theses - Archive

In electronic industry Ball grid array (BGA) package, surface mount technology has been used widely, due to its robust design, high density connections and improved performance. In surface mount technology, solder joints are used to interconnect package and PCB board assembly. High frequency laminates use in PCB boards provides excellent performance for high speed, frequency devices. Nelco 4000-13EPSI, Panasonic Megtron 6, and Rogers 4350B are few popular laminates. Component size reduction and structural complexity because of increasing number of transistors are making it very difficult to protect the packages from mechanical, thermal, and electrical damage. Difference in material properties between …

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Computational Morphology Modelling And Mixed Mode Fracture Analysis Of Zrb2/Sic Based Ceramic Nano-Materials Using Molecular Dynamics, Krutarth Shaileshkumar Patel Dec 2017

Computational Morphology Modelling And Mixed Mode Fracture Analysis Of Zrb2/Sic Based Ceramic Nano-Materials Using Molecular Dynamics, Krutarth Shaileshkumar Patel

Mechanical and Aerospace Engineering Theses - Archive

Transition metal carbides, nitrides, and borides are a group of Ultra High-Temperature Ceramic (UHTC). Owing to their remarkable properties of the high melting point, high thermal conductivity and excellent strength at elevated temperature ZrB2 based composites are of high interest for use in the high-temperature environment. It is proved that addition of SiC in ZrB2 can advance composite’s oxidation resistance, mechanical strength, fracture toughness and sintering behavior. Firstly, molecular dynamics is used to simulate crack growth under mixed mode loading in Al, SiC, and ZrB2 single crystals by considering inclined crack under uniaxial tension and crack growth angle are compared …

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Investigation Of Thermophysical Properties Of Enhanced Molten Salt Nanofluids For Thermal Energy Storage (Tes) In Concentrated Solar Power (Csp) Systems, Joohyun Seo Dec 2017

Investigation Of Thermophysical Properties Of Enhanced Molten Salt Nanofluids For Thermal Energy Storage (Tes) In Concentrated Solar Power (Csp) Systems, Joohyun Seo

Material Science and Engineering Dissertations - Archive

Concentrated solar power (CSP) technologies have a great economical and technical potential for energy production in future. Its incorporation with thermal energy storage (TES) overcomes one of the biggest challenges in most renewable energy technologies, the intermittency of energy supply by natural resources. TES with 15-hour storage capacity is already commercialized to operate a CSP plant for 24 hours a day. When the sunlight is concentrated by mirrors into a small focal point, a heat transfer fluid (HTF) transfers the collected heat to a turbine or an engine to produce electricity and any surplus heat to a TES unit for …

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Shear Behavior Of Synthetic Fiber Reinforced Concrete Box Culverts, Mahnaz Mostafazadeh Dec 2017

Shear Behavior Of Synthetic Fiber Reinforced Concrete Box Culverts, Mahnaz Mostafazadeh

Civil Engineering Dissertations - Archive

This research pursues a comprehensive experimental study on the shear capacity of zero-slump, dry-cast Synthetic Fiber-Reinforced Concrete (SYN-FRC) with the aim of reducing or even eliminating stirrups in box culverts. Since using stirrups in structures such as box culverts need labor work and cause reinforcement congestion, eliminating or reducing stirrups in design, prevent poor-quality concrete, help better concrete compaction and could save manufacturer time and money over the years. This study first determined the shear capacity of synthetic fiber concrete matrix by varying fiber volume fraction. Then, FEA and full experimental tests have been conducted to evaluate the effect of …

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Revealing Hemodynamic Response And Dynamic Changes In Functional Cortical Networks Using Functional Near-Infrared Spectroscopy (Fnirs), Jianwei Cao Dec 2017

Revealing Hemodynamic Response And Dynamic Changes In Functional Cortical Networks Using Functional Near-Infrared Spectroscopy (Fnirs), Jianwei Cao

Bioengineering Dissertations - Archive

Therapeutic interventions, such as physical therapy and non-invasive brain electrical stimulation can enhance the physical performance of persons with brain disorders. One often-used form of physical therapy named constraint-induced movement therapy (CIMT) improves motor control skills of children with cerebral palsy (CP) through forced intensive use of the affected extremity. A complementary method to physical rehabilitation methods for overcoming a deficit is to facilitate use of the affected brain areas by non-invasive brain electrical stimulation. One currently popular form of brain stimulation is transcranial direct current stimulation (tDCS), which has been shown to enhance both motor and language performance in …

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Plasma Enhanced Chemical Vapor Deposition Coating Amorphous Silica Based Implants Enhancing Angiogenesis And Mitigating Toxic Oxidative Stress In Critical Size Bone Defects, Felipe Alves Monte Dec 2017

Plasma Enhanced Chemical Vapor Deposition Coating Amorphous Silica Based Implants Enhancing Angiogenesis And Mitigating Toxic Oxidative Stress In Critical Size Bone Defects, Felipe Alves Monte

Bioengineering Dissertations - Archive

The advances in bone tissue engineering search for a biomaterial that could efficiently and gradually replace the bone while the new tissue grows through the implanted structure. However, due to limitations mainly related to mechanical properties and challenges, such as the balance between tissue regeneration and material degradation, the coating of well-known inert materials still has been used in orthopedics and dental clinical practices. Bone defects are commonly related to deleterious oxidative stress induced by low oxygen levels and inflammation. Toxic oxidative stress can impair damaged tissue healing due to inhibiting new blood vessels and new bone formation. The interaction …

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Improvements To The Duplicate Shear Tester, Yazeed Suleiman Jweihan Dec 2017

Improvements To The Duplicate Shear Tester, Yazeed Suleiman Jweihan

Civil Engineering Theses - Archive

Rutting in the asphalt concrete layer is a major distress in flexible pavements caused by the permanent shear deformation in asphalt mixes. The shear deformation is induced by heavy truck axis during hot summer days. Rutting affects directly the safety and users comfort. Therefore, developing of an appropriate test device for measuring the fundamental shear properties of asphalt mixes is important in order to improve the rutting resistance of asphalt mixes and pavement performance. The desired device should be simple, inexpensive, and accurate to be able to be incorporated for a quality control or quality assurance process, as well as …

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Evaluation Of Plant Root On The Performance Of Evapotranspiration (Et) Cover System, Md Jobair Bin Alam Dec 2017

Evaluation Of Plant Root On The Performance Of Evapotranspiration (Et) Cover System, Md Jobair Bin Alam

Civil Engineering Dissertations - Archive

The performance of an evapotranspiration (ET) cover for a landfill exceeds that of a conventional landfill final cover. Its low percolation and high evapotranspiration rely on the properties of unsaturated soils, the energy demands of plants, and the atmosphere. Plant roots pull water out of the cover soil and release it into the environment, thus managing water in a much more natural way than the conventional cover, where water is controlled by creating a physical barrier. Therefore, plant roots are a significant component in the optimization of ET cover performance. In recent years, a great deal of effort has been …

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The Effect Of Corporate Governance On The Change In Market Valuation Of Corporate Spin-Offs: An Empirical Investigation Of Spun-Off Subsidiaries, Orhan Volkan Ozbek Dec 2017

The Effect Of Corporate Governance On The Change In Market Valuation Of Corporate Spin-Offs: An Empirical Investigation Of Spun-Off Subsidiaries, Orhan Volkan Ozbek

Management Dissertations - Archive

This dissertation focuses on the change in market valuation of spun-off subsidiaries two years after the corporate spin-off. A review of the literature indicates that the research pertaining to determinants of the market valuation following corporate spin-offs from the perspective of spun-off subsidiaries has been limited. While the extensive corporate governance literature indicates that different governance structures of the firm have diverse implications on the choice of firm strategies and associated performance, our knowledge of how these governance elements might impact the change in market valuation of spun-off subsidiaries is virtually nonexistent. Grounded in agency, resource dependence, and upper echelons …

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Quantitative Non-Destructive Evaluation (Nde) Of Frp Laminate-Concrete Bond Strength, Mina Riad Dec 2017

Quantitative Non-Destructive Evaluation (Nde) Of Frp Laminate-Concrete Bond Strength, Mina Riad

Civil Engineering Dissertations - Archive

Repair and rehabilitation methods for civil infrastructure have become a topic of great interest to engineers. Fiber Reinforced Polymer (FRP) is considered as one of the most popular and practical solutions for strengthening and retrofitting of civil infrastructure. Several past studies indicated that significant increase in strength and stiffness can be achieved by using this technology. The FRP-concrete interface bond is critical in transferring stresses from the concrete surface to the FRP. However, the evaluation of the bond strength is still a challenging issue. To evaluate the bond strength using non-destructive techniques, 32 concrete beams strengthened with FRP using different …

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Non-Linear Analysis Of Steel Fiber Reinforced Concrete Hollow Columns Under Uniaxial Bending, Mohammed Huzaifa Ghori Dec 2017

Non-Linear Analysis Of Steel Fiber Reinforced Concrete Hollow Columns Under Uniaxial Bending, Mohammed Huzaifa Ghori

Civil Engineering Theses - Archive

This study investigates the performance of Steel Fiber Reinforced concrete hollow columns under axial compressive load and uniaxial bending with varying amounts of steel fiber using Finite Element Method of Analysis. The columns are of two groups, one with a 10% void and the other group has 20% void at the center. Each group’s specimens’ fiber content is varied in 0.5% increments from 0 to 1.5%. Also, the collapse load of the columns was obtained. Numerical results were compared with the available experiments. Two parametric studies were conducted by varying the amount of void percentages and steel fiber contents. In …

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Petrophysical Characterization Of The Jo Mill Submarine Fan Complex, Spraberry Trend, Midland Basin, Texas, Benjamin Frederic Rogers Dec 2017

Petrophysical Characterization Of The Jo Mill Submarine Fan Complex, Spraberry Trend, Midland Basin, Texas, Benjamin Frederic Rogers

Earth & Environmental Sciences Theses - Archive

Understanding and quantifying reservoir quality require a new suite of knowledge when approaching the nanometer sized pore-networks of unconventional reservoirs. These low porosity and permeability reservoirs have been produced in major basins all over the world, but characterizing their pore networks has been fairly recent in its application. One of the challenges of quantifying reservoir characteristics like porosity, pore size distribution, permeability, and tortuosity in unconventional reservoirs is the abundance of their nanometer-sized pore systems. Pore systems in these rocks tend to behave differently and with less predictability than the conventional reservoir. The Spraberry Formation in the Midland Basin of …

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Characterization Of Nanopetrophysical Properties Of The Mancos “B”/ Prairie Canyon Member Of The Mancos Shale, Rio Blanco, Colorado, Scott Brian Leaseburge Dec 2017

Characterization Of Nanopetrophysical Properties Of The Mancos “B”/ Prairie Canyon Member Of The Mancos Shale, Rio Blanco, Colorado, Scott Brian Leaseburge

Earth & Environmental Sciences Theses - Archive

Over the past decade hydrocarbon production from unconventional reservoirs has grown to become a significant source of North American domestic energy and will likely continue so for decades to come. However, production from unconventional reservoirs is plagued with low overall recovery and sharp declines in production. Low matrix permeability and poor pore connectively are significant factors limiting recovery and production. Research into the fluid flow characteristics of low permeability reservoirs can lead to extended initial production and greater overall recovery. Technically recoverable unconventional oil and gas resources in the Mancos Shale of the Piceance Basin are estimated to be 66.3 …

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Numerical Solution Of Saddle Point Problems By Projection, Gul Karaduman Dec 2017

Numerical Solution Of Saddle Point Problems By Projection, Gul Karaduman

Mathematics Dissertations - Archive

In this thesis, we work on iterative solutions of large linear systems of saddle point problems of the form    A B1 T B2 0       x y    =    f 0    , where A ∈ R n×n , B1, B2 ∈ R m×n , f ∈ R n , and n ≥ m. Many applications in computational sciences and engineering give rise to saddle point problems such as finite element approximations to Stokes problems, image reconstruction, tomography, genetics, statistics and model order reduction for …

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The Banner - V. 152, No. 11 - (December 2017), Christian Reformed Church In North America Dec 2017

The Banner - V. 152, No. 11 - (December 2017), Christian Reformed Church In North America

The Banner

No abstract provided.

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