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Articles 77131 - 77160 of 195925

Full-Text Articles in Engineering

Monitoring Calcification In Rigid Wet Cooling Media Used In Direct Evaporative Cooling Of Data Centers., Hemanth Narayan Dakshinamurthy May 2018

Monitoring Calcification In Rigid Wet Cooling Media Used In Direct Evaporative Cooling Of Data Centers., Hemanth Narayan Dakshinamurthy

Mechanical and Aerospace Engineering Theses - Archive

Rigid wet cooling media is a key component of direct and indirect evaporative cooling systems. Evaporation is the process of a substance in a liquid state changing to a gaseous state. When water evaporates only H2O molecules gets evaporated and the other chemicals in the water is left behind on the surface as residue. Soul concentration is to determine how calcium scale affects the overall performance i.e. saturation efficiency and pressure drop across the media pad. An Accelerated Degradation Testing by rapid wetting and drying on the media pads at elevated levels of calcium was planned on the media pad. …

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Thermal Degradation Of Passive Components For Use In Single Phase Immersion Cooling Application, Keerthivasan Padmanaban May 2018

Thermal Degradation Of Passive Components For Use In Single Phase Immersion Cooling Application, Keerthivasan Padmanaban

Mechanical and Aerospace Engineering Theses - Archive

The growth in the computing and data industry demands high-performance data centers where the thermal management issues are of greater concern. A cooling system paradigm using the immersion cooling technology is a more reliable and effective method. In immersion cooling, servers are directly submerged into a dielectric fluid. A comparative study on the reliability of the passive components cooled by air, mineral oil and EC-100 was carried out. The Accelerated Thermal Cycling test based on ATC JEDEC is applicable only for air cooling. The ASTM standards D 3455 with some suitable modification was adopted to test the material compatibility with …

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Extraction And Analysis Of Vector Flow Imaging Data In A Pediatric Population, Bailey Stinnett May 2018

Extraction And Analysis Of Vector Flow Imaging Data In A Pediatric Population, Bailey Stinnett

Biomedical Engineering Undergraduate Honors Theses

Vector flow imaging (VFI) is a new ultrasound technology that provides real time, angle-independent visualization of flow velocities in the heart and great vessels. Thus far, VFI has been used for superficial applications due to the limited penetration depth of available transducer probes; however, this depth in smaller pediatric patients enables adequate aortic views. In this project, VFI was used to study pediatric aortic stenosis (PAS)—a congenital heart defect that results in the narrowing of the aorta and/or aortic valve. The decision to refer PAS patients for surgical or catheter-based intervention is initially based on Doppler ultrasound. VFI is potentially …

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Effects Of Gsk101 Exposure On Astrocyte Mechanical Properties, Collagen Production, And Viability, Ethan Echols May 2018

Effects Of Gsk101 Exposure On Astrocyte Mechanical Properties, Collagen Production, And Viability, Ethan Echols

Biomedical Engineering Undergraduate Honors Theses

Transient receptor potential vanilloid 4 (TRPV4) is a cation channel protein which is thought to facilitate extracellular matrix (ECM) modification and glial scar formation following traumatic brain injury (TBI). Activation of TRPV4 has been shown to correlate with an increase in intracellular Ca2+ concentration. TRPV4 is subject to both chemical and mechanical activation. This study involved chemical activation of TRPV4 in cultured mouse astrocytes using GSK101, the primary agonist of TRPV4, and subsequent evaluation of mechanical and chemical changes to the ECM. Prior to GSK101 exposure, the cells were seeded into Matrigel Matrix, a gelatinous protein mixture intended to …

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3d Printed Force Transducers For In-Vitro Mitral Valve Chordae Tendineae Force Measurements, Hayley Chandler May 2018

3d Printed Force Transducers For In-Vitro Mitral Valve Chordae Tendineae Force Measurements, Hayley Chandler

Biomedical Engineering Undergraduate Honors Theses

Mitral valve surgery is incredibly prevalent in the United States with more than 40,000 mitral valve surgical procedures annually. Improving the imaging techniques used to diagnose these cases requires validation of 3D models through experimental data such as mechanical properties of the tissue. An essential part of this process for the mitral valve is measuring the force experienced by chordae tendineae. This has been achieved with brass force transducers but using a 3D printed design can have many benefits. In this study, 3D printed miniature c-shaped force transducers comparable to previous metal models were designed and created using Solidworks 2016. …

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Measurement Of The Thermal Performance Of A Single-Phase Immersion Cooled Server At Elevated Temperatures For Prolonged Time, Pratik Vithoba Bansode May 2018

Measurement Of The Thermal Performance Of A Single-Phase Immersion Cooled Server At Elevated Temperatures For Prolonged Time, Pratik Vithoba Bansode

Mechanical and Aerospace Engineering Theses - Archive

Fully immersion of servers in electrically non-conductive (dielectric) fluid has recently become a promising technique for minimizing cooling energy consumption in data centers. The improved thermal properties of these dielectric fluids facilitate considerable savings in both upfront and operating cost over traditional air-cooling. This technology provides an opportunity for accommodating increased power densities. It also minimizes and addresses the common operational issues of air cooling methods like overheating and temperature swing in the system, fan failures, dust, air quality, and corrosion. This paper presents various data about the performance of a fully single-phase dielectric fluid immersed server over wide temperature …

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Computational Fluid Dynamics Simulation-Based Artificial Neural Network Modelling For Data Center Cooling Prediction, Nikita Ravindra Sukthankar May 2018

Computational Fluid Dynamics Simulation-Based Artificial Neural Network Modelling For Data Center Cooling Prediction, Nikita Ravindra Sukthankar

Mechanical and Aerospace Engineering Theses - Archive

Continuous provision of quality supply air to data center’s IT pod room is key parameter in assuring effective data center operation without any down time. Due to number of possible operating conditions and non-linear relations between operating parameters make the working mechanism of data center difficult to optimize energy use. At present industries are using computational fluid dynamics (CFD) to simulate thermal behaviour for all types of operating conditions. The focus of this study is to predict Supply Air Temperature using Artificial Neural Network(ANN) which can overcome limitations of CFD such as high cost, need of expertise and large computation …

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Cfd Analysis Of Thermal Shadowing And Optimization Of Heat Sinks In 3rd Generation Open Compute Server For Single Phase Immersion Cooling Applications, Ravya Dandamudi May 2018

Cfd Analysis Of Thermal Shadowing And Optimization Of Heat Sinks In 3rd Generation Open Compute Server For Single Phase Immersion Cooling Applications, Ravya Dandamudi

Mechanical and Aerospace Engineering Theses - Archive

In today’s networking world, utilization of servers and data center has been increasing significantly. Increasing demands of processing and storage of data causes corresponding increase in power density of servers. The data center energy efficiency largely depends on thermal management of servers. Currently, air cooling is the most widely used thermal management technology in data centers. However, air cooling is starting to reach its limits due to very high-powered microprocessors and packaging. To overcome the limitations of air cooling in data centers, operators are moving towards immersion cooling using different dielectric fluids. Thermal shadowing is the effect in which temperature …

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Analysis And Comparison Between A Conventional Metal And A Metal-Composite Marine Propeller Shaft, Kaushal Mayankkumar Shah May 2018

Analysis And Comparison Between A Conventional Metal And A Metal-Composite Marine Propeller Shaft, Kaushal Mayankkumar Shah

Mechanical and Aerospace Engineering Theses - Archive

The basic principal of a ship propulsion is the reactive (thrust) force generated by the propellers against the stream of water which forces the ship to propel in the opposite direction. The Shafting system is thus required to transmit the necessary torque to the propeller at a certain speed. Studies have suggested that shafts are the most common reason of failures among the whole marine propulsion system comprising of the main engine and propeller apart from the shaft. Stress concentration and torsional vibrations are the two major causes of failure in the propulsion shafting systems based on the case study …

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Comparison Of Steel And Composite Leaf Springs Using Fea, Prashik Sunil Gaikwad May 2018

Comparison Of Steel And Composite Leaf Springs Using Fea, Prashik Sunil Gaikwad

Mechanical and Aerospace Engineering Theses - Archive

Composite materials are widely used in aeronautical, marine and automotive industries, because of their excellent mechanical properties, low density and ease of manufacture. Due to this increasing trend to utilize composite materials, it has become necessary to investigate the pros and cons of composites. Increasing competition and innovation in automobile sector tends to modify the existing products by new and advanced material products. A suspension system of vehicle is also an area where these innovations are carried out regularly. Leaf springs are one of the oldest suspension components that are being still used widely in automobiles. They contribute to 15-20% …

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Experimental Analysis Of The Effects Of Single-Phase Immersion Cooling Of Optical Interconnects On Mechanical Properties Of Active Optical Cables, Hrishabh Singh May 2018

Experimental Analysis Of The Effects Of Single-Phase Immersion Cooling Of Optical Interconnects On Mechanical Properties Of Active Optical Cables, Hrishabh Singh

Mechanical and Aerospace Engineering Theses - Archive

Active optical cables (AOC) are being increasingly adopted for data communication and storage, networking, and high-performance computing (HPC) applications. However, their ability to meet higher data-rate requirements necessitates increased heat dissipation demands in fiberoptic datacom systems. Many dielectric coolants having heat capacities much higher than that of air are available in the market. However, there is a lack of literature and data on the reliability of using single-phase dielectric fluids for immersion-cooling of inter and intra-rack optical interconnections in data centers. Industry standards and prevalent aging test methods for optical cables prove insufficient as they do not address immersion in …

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Study Of Copper-Rich Intermetallic Phase Formation In Copper-Aluminum Binary System, Valery Georges Ouvarov-Bancalero May 2018

Study Of Copper-Rich Intermetallic Phase Formation In Copper-Aluminum Binary System, Valery Georges Ouvarov-Bancalero

Material Science and Engineering Dissertations - Archive

This work aims to study the initial formation and subsequent growth of intermetallic compounds (IMC) in the binary Al-Cu system. Al-Cu pair configurations have been successfully used for several decades as structural components, and extensive research on their mechanical and metallurgical properties is available. More recently, the microelectronics industry started implementing the Cu wire-bond technology, which renewed the interest of the scientific community. As with every technological evolution, initial quality and reliability issues arose. Copper (Cu) wire to aluminum (Al) bond-pad is prone to crack nucleation leading to failure at the interface between Cu and Cu-rich IMCs. Even though numerous …

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Investigation Of Functional Connectivity And Neurovascular Coupling In Different Vigilance / Breath-Hold States Of The Brain From Simultaneous Eeg-Fnirs Measurements, Olajide Babawale May 2018

Investigation Of Functional Connectivity And Neurovascular Coupling In Different Vigilance / Breath-Hold States Of The Brain From Simultaneous Eeg-Fnirs Measurements, Olajide Babawale

Bioengineering Dissertations - Archive

Functional connectivity and neurovascular coupling are important phenomena that occur in the brain. Functional connectivity is the study of functional brain networks and their characteristics. While neurovascular coupling is the relationship or link between neuronal activity and corresponding cerebral blood flow in the brain. Up until now, both functional connectivity and neurovascular coupling have not been studied in different vigilance states of the brain from wakeful rest state to sleep state, using simultaneous EEG-fNIRS measurements. Also, the neurovascular coupling in different states of breath-holding has not been studied using simultaneous EEG-fNIRS measurements Therefore, my doctoral research utilized a whole-head simultaneous …

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An Investigation Of Water Pipeline Renewal Practices, Abbas Abed Salman May 2018

An Investigation Of Water Pipeline Renewal Practices, Abbas Abed Salman

Civil Engineering Theses - Archive

Globally, the use of trenchless technologies is gradually increasing due to the growing need to replace and renew aging utility infrastructure and the need for more flexible solutions for the installation of new pipes. In the United States of America, the American Society of Civil Engineers (ASCE) in 2017 assessed that America’s infrastructure is close to failing. It faces an annual shortfall of at least $11 billion to replace the aging facilities that are near the end of their useful lives. In this research, surveys and interviews of professionals working in trenchless technologies for the North American Society for Trenchless …

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Determination Of Root Length Of Evapotranspiration Cover Using Electrical Resistivity Imaging Technique, Fouzia Hossain Oyshi May 2018

Determination Of Root Length Of Evapotranspiration Cover Using Electrical Resistivity Imaging Technique, Fouzia Hossain Oyshi

Civil Engineering Theses - Archive

Evapotranspiration (ET) covers are receiving an increasing amount of attention for use at waste disposal sites. Instead of using barrier layers like conventional covers, percolation in ET cover system is minimized by water balance components which store the water prior to its transpiration through vegetation or evaporation from the soil surface. Vegetation for an ET cover must be suitable for its particular locality and have well-developed root systems, since they promote transpiration and contribute to the long-term performance of the cover. They pull water out of the cover soil and release it into the environment, thereby decreasing the percolation of …

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Creep Response And Adhesion Dynamics Of Glioblastoma Multiforme Cells During Migration In Confined Environment, Ishan Kamal Khan May 2018

Creep Response And Adhesion Dynamics Of Glioblastoma Multiforme Cells During Migration In Confined Environment, Ishan Kamal Khan

Bioengineering Dissertations - Archive

Glioblastoma multiforme (GBM) is the most common and malignant form of primary brain tumor. One of the major challenges facing the treatment of GBM tumors is the detachment and subsequent migration of peripheral cells. Migration of GBM cells take place in mechanically distinct confined microenvironment along the borders of white matter tracts. Studies using microfluidic devices mimicking the in-vivo microenvironment have shown that the migration characteristics are significantly altered with the change in kinematic state of the migrating cell. Several studies on different types of cells have consistently shown that a cancerous cell is more compliant than a normal cell …

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Concrete Breakout Strength Of Post-Installed Anchors Within Fiber Reinforced Concrete, Travis Michael Pechacek May 2018

Concrete Breakout Strength Of Post-Installed Anchors Within Fiber Reinforced Concrete, Travis Michael Pechacek

Civil Engineering Theses - Archive

This study investigates the effects of Polypropylene fibers on the concrete breakout of post-installed screw anchor bolts. Concrete anchors were installed within concrete specimens of differing amounts of Polypropylene fibers. Four differing mixtures were produced using, 0, 0.5, 1, and 1.5% fibers by volume of the mixture. Their physical properties were calculated through testing at the Civil Engineering Laboratory Building (CELB). In total, 16 cylindrical specimens, 4” in diameter and 8” in height, and 6 beam specimens, 6”x6”x20” were produced and tested. After 28 days of curing, the specimens were tested for their compressive and tensile strengths, as well as …

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Evaluation Of The Seasonal Variation In Hydraulic Conductivity For An Evapotranspiration Cover System, Lucas Hoyos Cadavid May 2018

Evaluation Of The Seasonal Variation In Hydraulic Conductivity For An Evapotranspiration Cover System, Lucas Hoyos Cadavid

Civil Engineering Theses - Archive

The purpose of landfill cover systems is to minimize, and if possible prevent the interaction of the environment with the buried waste mass. In this effort, one of the most prevalent parameters to control is the percolation of rainfall through the cover system into the waste mass. In addition to this, if the cover system utilizes an evapotranspiration or water balance cover, understanding this parameter becomes especially important. This type of system relies on the ability of the soil to retain moisture and the natural process through which vegetation transports water from its roots to the atmosphere. Consequently, the percolation …

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Impacts Of Geotechnical Aspects In Tunneling Design And Construction, Mohammad Haadi Sadaghiani May 2018

Impacts Of Geotechnical Aspects In Tunneling Design And Construction, Mohammad Haadi Sadaghiani

Civil Engineering Theses - Archive

In tunneling project, different type of methods is conducted to do the project. Knowing geotechnical aspects of tunnel project is unavoidable and crucial in early stage of project especially before contract to have efficient and more accurate design and prevent cost overruns, reduce bid price and reduce project risks. However, all that geotechnical information should be based on standard guidelines such as Geotechnical Baseline Report (GBR) to help owner how to provide those geotechnical data in bid contract and use it as a guideline in contract to prevent future claim or disputes. The main objective of this thesis is about …

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Effect Of Fine Grained Soil In The Strength Of Cement Treated Flex-Base Materials, Sita Timsina May 2018

Effect Of Fine Grained Soil In The Strength Of Cement Treated Flex-Base Materials, Sita Timsina

Civil Engineering Theses - Archive

The recycled materials such as, Recycled Crushed Concrete Aggregates (RCCA) and Reclaimed Asphalt Pavement (RAP) treated with cement has been widely used as the alternative granular base in pavement construction in different states in USA due to the depletion of natural resources of virgin aggregates. While a number of factors drive the use of these recycled materials, the two primary factors are economic savings and environmental benefits. In the flexible pavement systems, the base layer contributes to the structural capacity of the pavement systems, so, the quality performance of this layer is essential. However, presence of fine particles in the …

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Diagnosis And Quantification Of Post-Disaster Construction Material Cost Fluctuations, Niloufar Khodahemmati May 2018

Diagnosis And Quantification Of Post-Disaster Construction Material Cost Fluctuations, Niloufar Khodahemmati

Civil Engineering Theses - Archive

The post-disaster survival of cities and communities depend on their capabilities to rapidly reconstruct damages. Temporary increase in construction costs following natural disasters, also known as “demand surge,” impedes the rapid post-disaster reconstruction process. The existing methods for quantifying the post-disaster construction cost escalations do not consider seasonal patterns and inflation of costs under normal condition. Therefore, it is not clear whether the quantified construction cost increases are due to a disaster or merely associated with seasonal patterns and inflation. The objective of this study is to (1) create an approach to statistically quantify the post-disaster construction material cost fluctuations …

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Evaluation Of Beams And Columns Strengthening With Pre-Saturated And Regular Cfrp, Preeti Pandey May 2018

Evaluation Of Beams And Columns Strengthening With Pre-Saturated And Regular Cfrp, Preeti Pandey

Civil Engineering Theses - Archive

Structural members such as columns and beams are often subjected to reduced capacity due to errors in design or construction or often due to deterioration with time. The effect of reduction in capacity due to environmental and loading conditions are often the causes for deterioration or complete failure of structures. The main objective of this study is to deliver the effect of using Pre-Saturated Carbon Fiber Reinforced Polymer (CFRP) over regular CFRP Laminates, as an external strengthening material for strength and confinement of these deteriorated structures. The hypothesis was the use of Pre-Saturated CFRP over conventional regular CFRP Wet layup …

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Accelerated Creative Problem Solving And Product Improvement Applied To Experimental Devices In A Bloodstain Pattern Interpretation Class--Improving The Role Of Insight Development Tools As A Generator Of New Ideas In Novel Situations, Douglas Ridolfi May 2018

Accelerated Creative Problem Solving And Product Improvement Applied To Experimental Devices In A Bloodstain Pattern Interpretation Class--Improving The Role Of Insight Development Tools As A Generator Of New Ideas In Novel Situations, Douglas Ridolfi

Creativity and Change Leadership Graduate Student Master's Projects

This project uses an action research centered study protocol to examine the effects of a problem-based learning exercise related to bloodstain pattern interpretation in a crime scene processing and general criminalistics class taught as part of an upper division forensic chemistry major in a four year college. The goal is to apply design principles and creative problem solving methods directly adapted to a project involving interpreting a set of crime scene photographs depicting blood spatter and with the aid of guided exercises in ideation and design, lead students into the development of alternate theories of how the bloodstains were created …

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Wifi Gate Guard: A Captive Portal Implementation For Home Networks, Ben Blumenberg May 2018

Wifi Gate Guard: A Captive Portal Implementation For Home Networks, Ben Blumenberg

Computer Science and Software Engineering

WiFi Gate Guard aims to improve the user experience for authentication on home wireless networks, by alleviating some of the hardships causes by passwords and by offering a platform on which further security enhancements could be built. It accomplishes this by using captive portal technology, making it extremely easy for guests to authenticate without needing to ask for a password. Home network administrators can approve or deny access using a simple iOS app. WiFi Gate Guard is built to run on basic home routers, with minimal other hardware requirements. Once it’s up and running, passwords never need to be used …

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Dispensing Medical Countermeasures In Public Health Emergencies Via Home Health Agencies And Points Of Distribution, Anna Hudgeons May 2018

Dispensing Medical Countermeasures In Public Health Emergencies Via Home Health Agencies And Points Of Distribution, Anna Hudgeons

Industrial Engineering Undergraduate Honors Theses

A major concern regarding emergency preparedness on the state government level involves the handling and dispensing of the Strategic National Stockpile (SNS) of medicinal supplies. Each state is required to update and maintain a plan of action for dispensing SNS materials that would effectively provide care to the state’s population in times of distress. This research evaluates a state’s ability to dispense an adequate amount of medicine to her population in a timely manner, specifically after it has been received by the state government. Although simulation modeling has previously been utilized to replicate the dispensing process at pre-designated points of …

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Qualitative Evaluation Of Cfrp-Concrete Bond Using Non-Destructive And Destructive Testing Methods, Ankita Anil Lad May 2018

Qualitative Evaluation Of Cfrp-Concrete Bond Using Non-Destructive And Destructive Testing Methods, Ankita Anil Lad

Civil Engineering Theses - Archive

CFRP (Carbon Fiber Reinforced Polymer) laminates have been used as externally bonded reinforcements for retrofitting and structural strengthening of concrete structures. The adequacy of the CFRP bonding highly depends on the bond integrity between the concrete and CFRP laminates. Considering the reliability of this bonding technique, premature debonding of laminates from the concrete substrate is a major concern. The bond performance may be influenced directly by various parameters; some of the parameters like surface wetness, surface preparation, presence of voids in concrete substrate and overhead versus on the top installation of CFRP laminate have been discussed in this study. During …

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Sustainable Waste Management Through Operating Landfill As Biocell, Naima Rahman May 2018

Sustainable Waste Management Through Operating Landfill As Biocell, Naima Rahman

Civil Engineering Dissertations - Archive

Solid waste is being generated at a record pace, and disposal of it requires advanced waste management services at a reasonable cost. Landfilling is the most suitable waste disposal and management technique currently available, and it is being used throughout the world. It is, however, the largest anthropogenic source of atmospheric methane, and it requires a lot of space. The primary objective of this study was to investigate an alternative sustainable solution to waste management by operating landfills as biocells. Biocells are cost effective, produce methane more rapidly, and accelerate space recovery. A laboratory scale study was conducted to investigate …

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Investigation Of 1064-Nm Laser Fluence Within Tissue Phantoms And Its In Vivo Effects On Human Brain Networks, Hasan Parvez May 2018

Investigation Of 1064-Nm Laser Fluence Within Tissue Phantoms And Its In Vivo Effects On Human Brain Networks, Hasan Parvez

Bioengineering Theses - Archive

For the past few decades there has been an increasing interest in the usage of near infrared (NIR) laser in the medical optics field. This is due to a number of studies conducted on different animal models utilizing NIR laser, which was reported to provide improvement in such cognitive functions as memory, decision making, and executive functions. The NIR laser produces no adverse effects in the human tissue, having a potential for treating different neurological disorders. However, there is limited knowledge related to the underlying mechanism of photon interaction with the human tissue. In this thesis, I tried to address …

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Design And Optimization Of Mixed Ionic-Electronic Conductive Material For Use In Solid Oxide Fuel Cell Utilizing Carbon Nanotubes, Shiuan Duo Chiang May 2018

Design And Optimization Of Mixed Ionic-Electronic Conductive Material For Use In Solid Oxide Fuel Cell Utilizing Carbon Nanotubes, Shiuan Duo Chiang

Mechanical and Aerospace Engineering Theses - Archive

Triple phase boundary (TPB) is considered to be an important limiting factor of the fuel cell performance. Triple phase boundary is a geometrical line where the ionic, electronic and gaseous fuel phase of the fuel cell comes in contact. Electrochemical reactions of the fuel cell occur at the TPB sites. The TPB length greatly impacts the efficiency of the fuel cells. Carbon nanotubes have recently been shown to enhance oxygen reduction reaction (ORR) of the fuel cell and transfer electrons with its conductive properties. CNT also provides porosity in the electrode and could facilitate mass transport. CNT allows for oxygen …

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Finite Element Analysis And Design Improvement Of Aerospace Composite Hinges, Gaurang Girish Sonpal May 2018

Finite Element Analysis And Design Improvement Of Aerospace Composite Hinges, Gaurang Girish Sonpal

Mechanical and Aerospace Engineering Theses - Archive

Hinges are the most commonly used mechanical bearings to connect 2 objects for relative rotational motion. Modern day aerospace hinges are generally made using either Aluminum, Steel or bronze. The study analyzes the use of composite material as an alternative to traditional materials for manufacturing these hinges. The research is focused on the Finite element Analysis of a composite hinge as well as an aluminum hinge. The load capacity of both the types of hinges are compared. To improve the design of the composite hinge, a combination of composite material and aluminum is used to model a hybrid hinge design. …

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