Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 55 for “"microstructural characterization"”.
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Microstructural Characterization of 3D Deposited Metal Structures
… A focus is on utilizing optimal cross-sectional characterization techniques to observe the microstructure, where optimal refers to the length scale being probed and the cost of preparation and characterization methods. Techniques ranging from optical transmission electron microscopy are used. …
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Mechanical and microstructural characterization of nuclear grade PCEA graphite
This thesis presents a comprehensive experimental characterization of PCEA (Petroleum Coke Extruded and Annealed) nuclear-grade graphite with emphasis on its density uniformity, elastic and strength properties, and microstructural fracture mechanisms. Bulk density measurements showed that PCEA …
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Microstructural Characterization of Thermally Treated Alloy 690 Steam Generator Tubing Material
Made available in DSpace on 2017-07-06T18:55:36Z (GMT). No. of bitstreams: 2 Nevling_James_E_MS.pdf: 34911212 bytes, checksum: 81d5267ee9815385edea94f1d94351e4 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1988
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Rheological and microstructural characterization of pea, lentil and almond protein gels
… proteins and (2) to characterize rheological and microstructural properties of plant protein gels so formed. The effects of protein concentration in the gelling solution (10%, 15% and 20%), ethanol content of the coagulation media (30%, 40%, 50%, 60%, 70% and 80%) and pH (2, 4 and 7) were …
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Microstructural characterization of a plasma sprayed ZrO2-Y2O3-TiO2 thermal barrier coating
… of titanium through the oating. A detailed microstructural characterization of the as-sprayed coating was done using TEM. Microstructural features such as micro-twins, antiphase-boundaries and mottled morphology associated with "non-transformable" tetragonal ZrO2 phase were identified. It is …
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The growth and microstructural characterization of ZnSe/GaAs quantum wells and double heterostructures
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Synthesis and microstructural characterization of phosphate cathode materials prepared by a polymeric steric entrapment precursor route
Due to its high energy density and cycling performance Li-ion batteries play an important role as energy storage technology in the future human development. Lithium ion batteries are appealing for applications that include portable electronics such as cellular phones and laptop computers. However, …
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Contributions and New Methods in Paleontology: Geochemical, Ultrastructural, and Microstructural Characterization of Archean, Proterozoic, and Phanerozoic Fossils
… focus on the geochemical, ultrastructural, and microstructural investigation of organic-walled microfossils, or acritarchs, from the Paleoproterozoic (2500–1600 Ma) and Mesoproterozoic (1600–1000 Ma), using a range of advanced instrumentation including field emission scanning electron …
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A Microstructural Characterization of as-Cast and Rapidly Solidified Titanium-Silicon Alloys (Silicide, Melt-Spinning, Precipitation, Metastable, Oxygen)
… and melt-spinning. Prior to RS, a careful microstructural characterization of the as-cast material was undertaken. This also involved a study of an homogenized and heat treated base alloy (Ti-2 wt%Si) to determine the types of precipitation reactions present in conventionally processed …
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Processing and microstructural characterization of a lithium doped and undoped polycrystalline bismuth(2) strontium(2) calcium copper(2) oxygen(x)
The high T$\sb{\rm c}$ superconducting oxide Bi$\sb2$Sr$\sb2$CaCu$\sb2$O$\sb{\rm x}$ (Bi2212) is very promising for the magnet and device applications.
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Electron microscopy studies in electrical ceramics: Dielectric composites and high critical temperature superconductors
This thesis is principally concerned with the microstructural characterization of dielectric composites in the system BaTiO$\sb3$-NaNbO$\sb3$ by transmission electron microscopy (TEM), with the expressed purpose of determining the interrelationships that exist between chemical composition and …
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Significance of nanosilica incorporation in type G oil well cement pastes
… materials and understanding the macro and microstructural characterization mechanisms of oil well cement (OWC). OWC slurries have stringent performance requirements, including low viscosity, rapid strength development, low permeability and enhanced degradation resistance. Preliminary …
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Efeito de elementos susbstitucionais e intersticiais nas propriedades mecânicas e na biocompatibilidade de ligas do sistema Ti-15Zr-xMo
… mapping and density measurements. The structural characterization was obtained by DRX measurments and analysis by the Rietveld's method. The microstructural characterization was performed by OM, SEM and TEM. The mechanical properties were analyzed by measures of Vickers microhardness and modulus …
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ELASTIC, MICROSTRUCTURAL AND GEOCHEMICAL CHARACTERIZATION OF KEROGEN MATURITY FOR SHALES
… involves working with SEM and micro-CT scan for microstructural characterization. Porosity and seismic velocities are measured on an immature Green River shale sample. The sample is then subjected to anhydrous pyrolysis for artificial maturation by cooking the sample at 3500C for three days. …
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Microscale mechanical characterization of materials for extreme environments
… This dissertation presents mechanical and microstructural characterization of nanocrystalline Cu alloys and demonstrate that addition of Nb solutes to grain boundaries greatly enhances the strength of Cu. The measured hardness of Cu90Nb10 alloy is 5.6 GPa which is more than double the …
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Infiltrated composite electrodes for solid oxide fuel cells
… issue. Degradation of SOFCs with time due to microstructural processes or chemical reactions that occur at operating conditions; and due to reduction/oxidation cycles caused by the changes in the anode has been an important obstacle that has prevented the widespread commercial use of SOFCs. In …
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Emulating Radiation-Induced Defect Microstructures by Neutrons and Dark Matter Using Ions
… dark matter. The main methodology used was microstructural characterization, including line profile analysis and transmission electron microscopy. Our results show how minor irradiation-induced defects evolve under different conditions and in different materials. Proton irradiation …
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Surface degradation and creep of Inconel 617 and Haynes 230 at high temperatures
… was employed. The experimental results and microstructural characterization lead to the following conclusions: 1. Short-term exposure in air showed a two-stage oxidation kinetics for both alloys. For alloy 617, the transition between the stages was related to Cr outward diffusion in the …
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