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 54 for “"EPMA"”.
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The effect of carbon dioxide on the density and compressibility of kimberlitic magma
… presence of carbonate and lack of water and with EPMA to verify the composition. Carbon was quantified using the by difference method, but plans are in place to develop a method to quantify this element by EPMA. The density data places constraints on the location of the melt compression curves, …
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Development of geochemical identification and discrimination by Raman spectroscopy. The development of Raman spectroscopic methods for application to whole soil analysis and the separation of volcanic ashes for tephrachronology
… method reliant on electron probe micro-analysis (EPMA) to analyse major element composition. However, it is often impossible to differentiate key tephra layers using EPMA alone. Raman spectroscopy is commonly used in chemistry, since vibrational information is specific to the chemical bonds and …
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Analysis of residual stresses in laser trimmed alumina microelectronic substrates
… (SEM/EDAX), electron probe microanalysis (EPMA) and electron spectroscopy for chemical analysis (ESCA). The results from these characterization steps gave results for fractography (optical), surface and bulk composition (SEM/EDAX), chemical composition (ESCA) and phase analysis (EPMA). …
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Grinding of cement clinkers : linking multi-scale fracture properties to system chemistry, mineralogy and microstructure
… and statistical electron-probe microanalysis (EPMA). Microstructure investigations were first performed with scanning electron microscopy (SEM), and three characteristic length scales were defined for clinkers: the nodules at the macroscale, the clinker matrix and porosity at the intermediate …
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Developing Levitation Laser-Fused Glasses as Proxies for Lower Mantle Experiments: a Methodological Approach
… (SEM) and electron probe microanalyzer analyses (EPMA). Back-scattered electron images and energy-dispersive x-ray spectroscopy (EDS) analyses of the spheres are obtained first on the SEM to gauge compositional accuracy and homogeneity, then EPMA analyses determine quantitatively the samples’ …
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Ionic exchanges between glass ionomers and demineralised dentine
… Those objectives are partly met with the use of EPMA and an in vitro model, specially designed to simulate clinical conditions as closely as possible. With EPMA, it is possible to identify, quantify and trace the migration of different elements, found in glass-ionomer, into the partly …
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Arsenic Release from Chlorine Promoted Oxidation of Pyrite in the St. Peter Sandstone Aquifer, Eastern Wisconsin
… material was measured as 674 ppm. Quantitative EPMA analysis shows As zoning in pyrite grains with concentrations up to 1 wt. % As. After mineral characterization, the thin sections were exposed to solutions of 60 mg/L "free chlorine," 1200 mg/L "free chlorine," and nanopure water (control) at …
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Identification of tephras from the Eastern Mediterranean using solid state techniques
… in the materials, electron probe microanalysis (EPMA) to obtain the chemical composition of the glassy components, and scanning electron microscopy (SEM) to study the morphology of the glassy components. The materials from the Philippi peat basin were found to be part of three tephra layers that …
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Laser induced breakdown spectroscopy of martian breccia Northwest Africa 7034: comparison with Mars Science Laboratory results
… acquired with electron probe microanalysis (EPMA) show agreement within LIBS instrument error. Comparison of NWA 7034 data with targets from Gale shows chemical and textural similarities. This study helps bridge the gap between Mars in situ and martian meteorite data by using LIBS data to …
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Understanding the Phase Transformations of a Medium Manganese Steel as a Function of Carbon Content
… (EBSD), electron probe microanalysis (EPMA), optical microscopy, and hardness testing. This thesis will discuss how the microstructure and hardness of these medium manganese steels is influenced by the carbon content.
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Characterization of Uranium Carbide Microspheres In An Inert Zirconium Carbide Matrix For Gas Fast Reactors
… electron microprobe for quantitative analysis (EPMA), and x-ray photoelectron spectroscopy (XPS). X-ray diffraction (XRD) was also used to find the crystal structure of the microspheres. The UC microspheres were further investigated by annealing. The annealing process was completed using a CM …
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A study of copper thick film conductor adhesion mechanisms on ceramic substrates
… optical microscopy, electronprobe microanalysis (EPMA), and high resolution scanning electron microscopy (SEM) techniques. X-ray diffraction and thermal analyses (TMA and TGA) techniques were used to analyze the ink additives.
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Vliv fosforečnanů na mobilitu arzenu v kontaminovaných oblastech
… XRD, Raman spectroscopy, ATR-FTIR, ICP-OES, or EPMA. The results obtained during my doctoral studies are presented in the form of three manuscripts. The first study explores the long-term impact of continuous input of relatively low phosphate discharged from a small- capacity wastewater …
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Experimental investigation of the fluid driven carbonation of serpentinites and spinel-peridotites: implications for the carbon and trace element cycle in the forearc region of the mantle wedge
… are examined by XRD, Raman spectroscopy, SEM, FE-EPMA, EPMA and Laser-Ablation-ICP-MS. 3D-µ-CT (three dimensional high resolution micro X-ray computed tomography) of recovered rock cores visualizes textures and porosity and determines phase abundances. This study demonstrates that carbonation of …
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Experimental investigation of the fluid driven carbonation of serpentinites and spinel-peridotites: implications for the carbon and trace element cycle in the forearc region of the mantle wedge
… are examined by XRD, Raman spectroscopy, SEM, FE-EPMA, EPMA and Laser-Ablation-ICP-MS. 3D-µ-CT (three dimensional high resolution micro X-ray computed tomography) of recovered rock cores visualizes textures and porosity and determines phase abundances. This study demonstrates that carbonation of …
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Environmental mineralogy of gold recovery from refractory gold-arsenic-bearing Bakyrchik concentrates
… products has been investigated using XRD and EPMA. This revealed arsenopyrite, As-bearing pyrite, and their alteration products containing up to 25% As, iron oxides and oxyhydroxides (with up to 2.5% As), haidingerite, and calcium arsenate in studied samples. Sequential extraction demonstrated …
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Purification of metals through filtration and electromagnetic separation
… diffraction (XRD), electron probe microanalysis (EPMA) and glow discharge mass spectrometry (GDMS). 3D FLUENT CFD simulation was made in support of the filtration experiments. In the high frequency electromagnetic field work, the induced fluid flow significantly enhanced particle segregation …
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Nano-ChemoMechanical assessment of Rice Husk Ash cement by wavelength dispersive spectroscopy and nanoindentation
… nanoscale in which electron probe microanalysis (EPMA) and nanoindentations are employed.
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Laser Processing of Metals and Polymers
… microscopy (SEM), electron probe microanalysis (EPMA), atomic force microscopy (AFM), high resolution optical microscopy, surface profilometry. Fourier transform infrared spectroscopy (FTIR) and x-ray diffraction (XRD). Power spectral density (PSD) spectra computed from AFM data gives further …
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