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2016

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Estimation Of Stable Distribution And Its Application To Credit Risk, Hua Mo Dec 2016

Estimation Of Stable Distribution And Its Application To Credit Risk, Hua Mo

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

To capture the heavy tails and the volatility clustering of asset returns is always an important topic in Â…nancial market. We studies two projects related to the Alpha Stable distribution and Classical Tempered Stable(CTS) distribution respectively which both have desired properties to accommodate heavy-tails and capture skewness in Â…nancial series. (1) In the major part of the Â…rst project, we introduce the algorithm of indirect inference method. By using the skewed-t distribution as an auxiliary model which is easier to handle, we can estimate the parameters of the Alpha Stable distribution since these two models have the same numbers of …

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An Investigation Into The Effects Of Process Parameters On The Quality Of Laminates, Haomin Liu Dec 2016

An Investigation Into The Effects Of Process Parameters On The Quality Of Laminates, Haomin Liu

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

In this work curing process for glass fiber reinforced polymer composite laminates is studied. Curing temperature, time and pressure were selected as the cure parameters for optimization. Central composite design (CCD) of design of experiment (DOE) approach was adopted for conducting the experiments. Flexural strength and flexural modulus of the composite laminate were the response measures to select the final cure parameters. Analysis of variance (ANOVA), surface plots and contour plots clearly demonstrate that temperature, time and pressure contribute greatly to the response functions. This establishes two models that can be used to predict the mechanical properties of composite laminated …

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3d Printing Of Metals, Ying Mu Dec 2016

3d Printing Of Metals, Ying Mu

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Additive manufacturing (AM), widely known as 3D printing, is a manufacturing method that produces parts from powders layer by layer. Many techniques have been developed to achieve this. In this thesis, the historical development and general principles of additive manufacturing are covered. The techniques for producing metal parts are explored, with a focus on the defects, processing parameters, mechanical properties and the relationships between them and the influences on each other. The various metal AM techniques are compared with the analysis of their strength, limitations and applicable conditions. The applications and mechanical properties of the most studied metal/alloys is another …

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Performance Evaluation Of A Dc Direct-Coupled Pv System In Comparison With A Typical Grid-Connected Ac System For A Commercial Building, Utkarshaa Varshney Dec 2016

Performance Evaluation Of A Dc Direct-Coupled Pv System In Comparison With A Typical Grid-Connected Ac System For A Commercial Building, Utkarshaa Varshney

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

With exponential hike in greenhouse gas emissions and depletion of fossil fuels, advancing renewable energy technology is the best available answer to global demands of clean and green energy. Solar Photovoltaic technology, although implemented worldwide, has a large further scope of improvement to create a fully accepted solar-powered society. One such concept can be a DC based photovoltaic system, which enables the use of DC power directly from solar panels without incorporating inverters. This thesis is based on a system-level PV project, which evaluates a newly installed DC direct-coupled system which uses DC power for office LED lighting, in comparison …

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Multifunctional, Chitosan-Based Nano Therapeutics: Design And Application For Two- And Three-Dimensional Cell Culture Systems, Giulia Suarato Dec 2016

Multifunctional, Chitosan-Based Nano Therapeutics: Design And Application For Two- And Three-Dimensional Cell Culture Systems, Giulia Suarato

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

There is a constant demand for sensitive and effective anti-cancer drug delivery systems, capable of detecting early-stage pathological conditions and increasing patient survival. Recently, chitosan-based drug delivery nanocomplexes have shown to smartly respond to the distinctive features of the tumor microenvironment, a complex network of extracellular molecules, stromal and endothelial cells, which supports the tumor formation and its metastatic invasion. Due to biocompatibility, easy chemical tailorability, and pH-responsiveness, chitosan has emerged as a promising candidate for the formulation of supramolecular multifunctional materials. The present study focuses on the design, fabrication and characterization of fluorescently labelled, hydrophobically modified glycol chitosan nano-micelles …

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Synchrotron X-Ray Topography Analysis Of Dislocation Line Directions In 4h-Sic Single Crystals, Jianing Yan Dec 2016

Synchrotron X-Ray Topography Analysis Of Dislocation Line Directions In 4h-Sic Single Crystals, Jianing Yan

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

This thesis presents a Synchrotron White Beam X-ray Topography study of dislocations in 4H- SiC single crystals. Basic introduction is given including the crystal structure and atomic arrangement, crystal growth techniques, and the dislocation types. The commonly observed dislocations, including Micropipes (MPs), Basal Plane Dislocations (BPDs), Threading Screw Dislocations (TSDs), Threading Edge Dislocations (TEDs), Threading Mixed Dislocations (TMDs), in 4H-SiC single crystals have been reviewed. Since the extensive application of SiC for power devices is limited by the presence of these dislocations, the minimization, and eventually elimination of these dislocations, have been a major impetus in both research and commercial …

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Evaluation Of 4h Silicon Carbide And Gallium Nitride Crystals For Power Electronics & Lighting Applications, Xiaolin Yang Dec 2016

Evaluation Of 4h Silicon Carbide And Gallium Nitride Crystals For Power Electronics & Lighting Applications, Xiaolin Yang

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Silicon carbide is a promising semiconductor material with more preferable properties than the traditional materials like silicon dioxide and gallium arsenide. With large band-gap, high breakdown voltage, high thermal conductivity and good resistance in radiation environment, SiC is widely used in electronic devices especially under high frequency, high voltage and high temperature. Despite of its good properties, the application of SiC is limited by the growth of high quality single crystal boule, namely, the defects inside the SiC crystals have deleterious effects on the performance of devices made of it. In this thesis, the combination of techniques including Synchrotron White …

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Fabrication Of A Novel Biosensor For Macromolecules Detection Through Molecular Imprinting Technique, Yingjie Yu Dec 2016

Fabrication Of A Novel Biosensor For Macromolecules Detection Through Molecular Imprinting Technique, Yingjie Yu

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

There is an increasing need for precise molecular detection as a diagnostic tool for early identification of diseases, pathogens, and abnormal protein levels in the body. Typical chemical analytical methods are generally costly, unstable, and time-consuming. Molecular imprinting (MI) technique，based on the “lock and key model†, could be a simple method to overcome those shortcomings. In this study, a self-assembled monolayer (SAM) was employed as a platform to fabricate MI biosensor for detection of macromolecules. I demonstrated that, when the monolayer was formed on a rough surface, this method was in fact templating molecules in three dimensions, and hence …

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Transport Studies Of Superconducting Materials, Cheng Zhang Dec 2016

Transport Studies Of Superconducting Materials, Cheng Zhang

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Superconducting materials are promising for future applications on energy transport and storage. The key properties for superconductors are critical temperature Tc, critical current density Jc and upper critical field Hc2. In this dissertation, detailed transport studies were performed on two superconducting materials: FeSe0.5Te0.5 thin films and the second generation YBa2Cu3O7-δ coated conductors, in order to determine what limits the broad applications of these superconductors. High quality of FeSe0.5Te0.5 thin films were grown by pulsed laser deposition. Low temperature oxygen annealing and proton irradiation were conducted on the films, as the post-treatment techniques in order to improve the transport performance. Jc …

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The Frame Retardant, Mechanical Properties, Thermal Properties And Permeability Of Biodegradable Polymers, Xianghao Zuo Dec 2016

The Frame Retardant, Mechanical Properties, Thermal Properties And Permeability Of Biodegradable Polymers, Xianghao Zuo

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Nano-particles are great additives to the thermal properties of the polymers, however, they sometimes have some disadvantages on the mechanical properties. The mixing of polymers and nano-particles such as cloisite clays, graphene, melamine polyphosphate and molybdenum disulfide, are mostly physical reactions between them. Therefore, the dispersion of the nano-particles inside the polymers is very important. As for the frame retardant of the polymers, the additives are used as three most important components during the mixing, i.e. the acid source, the carbonization agent (or char forming agent), and a blowing agent. The better the particles disperse in the polymer, the easier …

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A Spatio-Temporal Model Of Hunter-Gatherer Foraging Ecology Across The North American Great Plains Throughout The Paleoindian Period: Development Of Biological Theory And Statistical Methods To Link Human Evolutionary Biology, Ecology, And The Archaeological Record, Erik Roque Otárola-Castillo Dec 2016

A Spatio-Temporal Model Of Hunter-Gatherer Foraging Ecology Across The North American Great Plains Throughout The Paleoindian Period: Development Of Biological Theory And Statistical Methods To Link Human Evolutionary Biology, Ecology, And The Archaeological Record, Erik Roque Otárola-Castillo

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Hunter-gatherers spread to nearly every corner of the planet in large part due to their flexible ability to forage for high-quality foods in diverse environments. The study of human foraging behavior is therefore crucial to understanding the proximate and ultimate factors that have shaped human evolutionary history. Although not necessarily in an evolutionary context, the foraging behavior of Paleoindian hunter-gatherers in North America has been studied for over a century. Researchers have paid particular attention to Paleoindian foragers’ hunting of big game across the grasslands of the Great Plains, shedding light on “what†prey Paleoindians foraged, “where†foraging occurred on …

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Novel Adhesion Properties Of Irreversibly Adsorbed Polymer Chains, Zhizhao Chen Dec 2016

Novel Adhesion Properties Of Irreversibly Adsorbed Polymer Chains, Zhizhao Chen

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Interpenetrations (or entanglements) between chemically identical polymers are important parameters in fundamental physics and industrial applications. However, little is known about the interaction between free polymer chains and chemically identical, but otherwise highly adsorbed chains on solid surfaces. Here we report an unusual interaction between free chains and chemically identical flattened chains which have many surface-segmental contacts with solids. Based on the mechanical adhesion measurements, we found the 2.5 nm-thick equilibrium polyethylene-oxide (PEO) flattened layer show no adhesion with the PEO melts even at T >Tm. Liquid contact angle measurements further revealed that the flattened layer has the same macroscopic …

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Dilation Behavior Of Thermal Spray Coatings, Miryan Lorena Bejarano Dec 2016

Dilation Behavior Of Thermal Spray Coatings, Miryan Lorena Bejarano

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Thermal Spray (TS) is a very versatile manufacturing process to deposit thick coatings on a variety of substrates. Coatings are used in protective (i.e. wear, chemical attack, high temperature, etc.) and functional (i.e. sensors) applications. TS coatings have a unique lamellar microstructure as a result of the overlapping of millions of molten and partially-molten particles. During processing, high deformation by impact, high temperature, and rapid solidification lead to a complex hierarchical material system that contains a high amount of microstructural defects. The presence of defects in the microstructure contribute to differences in property values in comparison to bulk materials. Thermal …

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Characterization Of Structural Defects In Wide Band-Gap Compound Materials For Semiconductor And Opto-Electronic Applications, Ouloide Yannick Goue Dec 2016

Characterization Of Structural Defects In Wide Band-Gap Compound Materials For Semiconductor And Opto-Electronic Applications, Ouloide Yannick Goue

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Single crystals of binary and ternary compounds are touted to replace silicon for specialized applications in the semiconductor industry. However, the relative high density of structural defects in those crystals has hampered the performance of devices built on them. In order to enhance the performance of those devices, structurally perfect single crystals must be grown. The aim of this thesis is to investigate the interplay between crystal growth process and crystal quality as well as structural defect types and transport property. To this end, the thesis is divided into two parts. The first part provides a general review of the …

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Novel Processing Of Ceramics With Polymorphic Control, Gagan Jodhani Dec 2016

Novel Processing Of Ceramics With Polymorphic Control, Gagan Jodhani

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Polymorphism is an important phenomenon exhibited by many materials, including ceramic oxides. The availability of multiple structural configurations for the same chemical composition opens the pathway to a large number of phases with distinct properties. The formation of the crystal structures can be directly correlated to the processing temperature and/or pressure as well as the particle size for nanomaterials. This work focuses on the tailored synthesis of the desired polymorphs of binary and ternary metal oxides through nanoscale processes with emphasis on flame spray pyrolysis. Flame spray pyrolysis (FSP) is a scalable nano-manufacturing process used for the synthesis of oxide …

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Assessment Of Thermal Spray Coatings For Wear And Abrasion Resistance Applications, Ishaan Nitin Karode Dec 2016

Assessment Of Thermal Spray Coatings For Wear And Abrasion Resistance Applications, Ishaan Nitin Karode

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Thermal spray cermet and metallic coatings are extensively used for wear, abrasion and corrosion control in a variety of industries. The first part of the thesis focuses mainly on testing of sand erosion resistance of thermal spray coatings on carbon composites used in the manufacture of helicopter rotor blades. The test set-up employed is a sand blasting machine and is an effort to duplicate the in-flight conditions especially those encountered in hot arid conditions. The technique adopted follows the Department of Defence test method standard. Carbon Composites have excellent stiffness, strength and low weight/density. The strength to weight ratio is …

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Evolution Of Immiscibly Blended Functionalized Polymers With Respect To Cure Parameters And Formulation, Nicholas Walter Heller Dec 2016

Evolution Of Immiscibly Blended Functionalized Polymers With Respect To Cure Parameters And Formulation, Nicholas Walter Heller

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Powder coatings are becoming ubiquitous in the coating marketplace due to the absence of solvents in their formulation, but they have yet to see implementation in low-reflectance outdoor applications. This demand could be met by utilizing polymer blends formulated with low loadings of matting agents and pigments. The goal of this research is a thorough characterization of prototype low-reflectance coatings through several analytical techniques. Prototypical thermoset blends consist of functionalized polyurethanes rendered immiscible by differences in polar and hydrogen bonding characteristics, resulting in a surface roughened by droplet domains. Analysis of both pigmented and control clear films was performed. This …

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Light-Induced Self-Assembly And Diffusion Of Nanoclusters, Wenxuan Lian Dec 2016

Light-Induced Self-Assembly And Diffusion Of Nanoclusters, Wenxuan Lian

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Novel methods to build multiple types of three-dimensional structures from various nanoscale components are the most exciting and challenging questions in nano-science. The properties of the assembled structures can be potentially and designed, but the development of such approaches is challenging. In order to realize such rational assembly, a tunable interaction medium is often introduced into the system. Soft matter, such as polymers, surfactants and biomolecules are used to modify the surfaces of the nanoscale building blocks. Deoxyribonucleic acid (DNA) strands are known as polynucleotides since they are composed of simpler units called nucleotides. There are unique base pairing rules …

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3d Printing Of Metals, Ying Mu Dec 2016

3d Printing Of Metals, Ying Mu

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Additive manufacturing (AM), widely known as 3D printing, is a manufacturing method that produces parts from powders layer by layer. Many techniques have been developed to achieve this. In this thesis, the historical development and general principles of additive manufacturing are covered. The techniques for producing metal parts are explored, with a focus on the defects, processing parameters, mechanical properties and the relationships between them and the influences on each other. The various metal AM techniques are compared with the analysis of their strength, limitations and applicable conditions. The applications and mechanical properties of the most studied metal/alloys is another …

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On The Fracture Toughness And Crack Growth Resistance Of Bio-Inspired Thermal Spray Hybrid Composites, Michael Murray Resnick Dec 2016

On The Fracture Toughness And Crack Growth Resistance Of Bio-Inspired Thermal Spray Hybrid Composites, Michael Murray Resnick

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Nature has presented a remarkable bill of materials which show excellent mechanical properties. Among those which have been extensively studied are wood, bone, rocks, spider silk, nacre etc. Interestingly all of these materials are primarily known to have great fracture resistance and present excellent example of natural and layer-by-layer evolution of materials. These materials have inspired the current research society to synthesize new generation materials with mechanical properties beyond the conventional materials such as metal, ceramic and polymers. Nacre, one of the most researched natural materials, is present in particular sea-shells and shows a layered brick-and-mortar structure. Designing nacre-like structures …

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Application Of Lattice Boltzmann Methods In Complex Mass Transfer Systems, Ning Sun Dec 2016

Application Of Lattice Boltzmann Methods In Complex Mass Transfer Systems, Ning Sun

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Lattice Boltzmann Method (LBM) is a novel computational fluid dynamics method that can easily handle complex and dynamic boundaries, couple local or interfacial interactions/reactions, and be easily parallelized allowing for simulation of large systems. While most of the current studies in LBM mainly focus on fluid dynamics, however, the inherent power of this method makes it an ideal candidate for the study of mass transfer systems involving complex/dynamic microstructures and local reactions. In this thesis, LBM is introduced to be an alternative computational method for the study of electrochemical energy storage systems (Li-ion batteries (LIBs) and electric double layer capacitors …

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Performance Evaluation Of A Dc Direct-Coupled Pv System In Comparison With A Typical Grid-Connected Ac System For A Commercial Building, Utkarshaa Varshney Dec 2016

Performance Evaluation Of A Dc Direct-Coupled Pv System In Comparison With A Typical Grid-Connected Ac System For A Commercial Building, Utkarshaa Varshney

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

With exponential hike in greenhouse gas emissions and depletion of fossil fuels, advancing renewable energy technology is the best available answer to global demands of clean and green energy. Solar Photovoltaic technology, although implemented worldwide, has a large further scope of improvement to create a fully accepted solar-powered society. One such concept can be a DC based photovoltaic system, which enables the use of DC power directly from solar panels without incorporating inverters. This thesis is based on a system-level PV project, which evaluates a newly installed DC direct-coupled system which uses DC power for office LED lighting, in comparison …

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Multifunctional, Chitosan-Based Nano Therapeutics: Design And Application For Two- And Three-Dimensional Cell Culture Systems, Giulia Suarato Dec 2016

Multifunctional, Chitosan-Based Nano Therapeutics: Design And Application For Two- And Three-Dimensional Cell Culture Systems, Giulia Suarato

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

There is a constant demand for sensitive and effective anti-cancer drug delivery systems, capable of detecting early-stage pathological conditions and increasing patient survival. Recently, chitosan-based drug delivery nanocomplexes have shown to smartly respond to the distinctive features of the tumor microenvironment, a complex network of extracellular molecules, stromal and endothelial cells, which supports the tumor formation and its metastatic invasion. Due to biocompatibility, easy chemical tailorability, and pH-responsiveness, chitosan has emerged as a promising candidate for the formulation of supramolecular multifunctional materials. The present study focuses on the design, fabrication and characterization of fluorescently labelled, hydrophobically modified glycol chitosan nano-micelles …

Go to article

Evaluation Of 4h Silicon Carbide And Gallium Nitride Crystals For Power Electronics & Lighting Applications, Xiaolin Yang Dec 2016

Evaluation Of 4h Silicon Carbide And Gallium Nitride Crystals For Power Electronics & Lighting Applications, Xiaolin Yang

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Silicon carbide is a promising semiconductor material with more preferable properties than the traditional materials like silicon dioxide and gallium arsenide. With large band-gap, high breakdown voltage, high thermal conductivity and good resistance in radiation environment, SiC is widely used in electronic devices especially under high frequency, high voltage and high temperature. Despite of its good properties, the application of SiC is limited by the growth of high quality single crystal boule, namely, the defects inside the SiC crystals have deleterious effects on the performance of devices made of it. In this thesis, the combination of techniques including Synchrotron White …

Go to article

Fabrication Of A Novel Biosensor For Macromolecules Detection Through Molecular Imprinting Technique, Yingjie Yu Dec 2016

Fabrication Of A Novel Biosensor For Macromolecules Detection Through Molecular Imprinting Technique, Yingjie Yu

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

There is an increasing need for precise molecular detection as a diagnostic tool for early identification of diseases, pathogens, and abnormal protein levels in the body. Typical chemical analytical methods are generally costly, unstable, and time-consuming. Molecular imprinting (MI) technique，based on the “lock and key model†, could be a simple method to overcome those shortcomings. In this study, a self-assembled monolayer (SAM) was employed as a platform to fabricate MI biosensor for detection of macromolecules. I demonstrated that, when the monolayer was formed on a rough surface, this method was in fact templating molecules in three dimensions, and hence …

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Manipulation Of Dna At Polymer Surfaces: Electric-Field Controlled Adsorption, Patterned Cutting And Stretching, Ke Zhu Dec 2016

Manipulation Of Dna At Polymer Surfaces: Electric-Field Controlled Adsorption, Patterned Cutting And Stretching, Ke Zhu

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Recent developments in next generation DNA sequencing and optical restriction mapping involve manipulation of DNA molecules on surfaces. Here we propose a novel method that can control the adsorbed DNA density on polymer surfaces by applying an electric field. The efficiency of deposition was optimized with respect to DNA concentration in solution, electric field type and electric field strength. Enhancement of adsorption density of greater than twenty-fold was found. In addition, DNA molecules are fragmented on a polymer surface by soft lithography. Several experimental conditions have been tested to optimize the polydimethylsiloxane (PDMS) stamp fabrication and DNA cutting method. Fragmented …

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A Spatio-Temporal Model Of Hunter-Gatherer Foraging Ecology Across The North American Great Plains Throughout The Paleoindian Period: Development Of Biological Theory And Statistical Methods To Link Human Evolutionary Biology, Ecology, And The Archaeological Record, Erikroque Otárola-Castillo Dec 2016

A Spatio-Temporal Model Of Hunter-Gatherer Foraging Ecology Across The North American Great Plains Throughout The Paleoindian Period: Development Of Biological Theory And Statistical Methods To Link Human Evolutionary Biology, Ecology, And The Archaeological Record, Erikroque Otárola-Castillo

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Hunter-gatherers spread to nearly every corner of the planet in large part due to their flexible ability to forage for high-quality foods in diverse environments. The study of human foraging behavior is therefore crucial to understanding the proximate and ultimate factors that have shaped human evolutionary history. Although not necessarily in an evolutionary context, the foraging behavior of Paleoindian hunter-gatherers in North America has been studied for over a century. Researchers have paid particular attention to Paleoindian foragers’ hunting of big game across the grasslands of the Great Plains, shedding light on “what†prey Paleoindians foraged, “where†foraging occurred on …

Go to article

Dilation Behavior Of Thermal Spray Coatings, Miryan Lorena Bejarano Dec 2016

Dilation Behavior Of Thermal Spray Coatings, Miryan Lorena Bejarano

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Thermal Spray (TS) is a very versatile manufacturing process to deposit thick coatings on a variety of substrates. Coatings are used in protective (i.e. wear, chemical attack, high temperature, etc.) and functional (i.e. sensors) applications. TS coatings have a unique lamellar microstructure as a result of the overlapping of millions of molten and partially-molten particles. During processing, high deformation by impact, high temperature, and rapid solidification lead to a complex hierarchical material system that contains a high amount of microstructural defects. The presence of defects in the microstructure contribute to differences in property values in comparison to bulk materials. Thermal …

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Evolution Of Surface Morphology And Chemistry In Zno Thin Films And Steel Surfaces Studied By Synchrotron X-Ray Spectroscopy And Imaging, Hua Jiang Dec 2016

Evolution Of Surface Morphology And Chemistry In Zno Thin Films And Steel Surfaces Studied By Synchrotron X-Ray Spectroscopy And Imaging, Hua Jiang

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Thin film and surface treatment play an important role in developing materials with unique properties. They have been widely used in energy generation and storage, optical devices, LEDS, electrical semiconductor devices, etc. The stability and functionality of them under operational environment are important, especially the surface morphology and chemical evolution at micro-scale. This information is critical to understand the behaviors of the materials under various environments for a wide range of applications. Synchrotron x-ray fluorescence (XRF) and x-ray absorption near edge structure (XANES) are suitable techniques on investigating surface morphology and chemical evolution. Here, we use both techniques to investigate …

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Assessment Of Thermal Spray Coatings For Wear And Abrasion Resistance Applications, Ishaan Nitin Karode Dec 2016

Assessment Of Thermal Spray Coatings For Wear And Abrasion Resistance Applications, Ishaan Nitin Karode

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Thermal spray cermet and metallic coatings are extensively used for wear, abrasion and corrosion control in a variety of industries. The first part of the thesis focuses mainly on testing of sand erosion resistance of thermal spray coatings on carbon composites used in the manufacture of helicopter rotor blades. The test set-up employed is a sand blasting machine and is an effort to duplicate the in-flight conditions especially those encountered in hot arid conditions. The technique adopted follows the Department of Defence test method standard. Carbon Composites have excellent stiffness, strength and low weight/density. The strength to weight ratio is …

Go to article

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