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 189 for “"Microprobe"”.
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Quantitative compositional mapping with the electron microprobe
Includes bibliographical references (page 108).
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An electron microprobe study of luminescence centers in cassiterite
An electron microprobe equipped with a device for making luminescence measurements has been used to determine the concentration of luminescence activators in zoned cassiterites of hydrothermal origin. Micron-scale growth zones contain variable amounts of Ti, Fe, W and other impurities. The impurity …
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Electron Microprobe and X-Ray Diffraction Study of Natural Idocrase
Made available in DSpace on 2014-12-11T18:09:57Z (GMT). No. of bitstreams: 1 7207078.pdf: 3037853 bytes, checksum: aafc716a41bd573f1db649c5d11795f2 (MD5) Previous issue date: 1971
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Oxygen stable isotopic analysis of calcite by Raman microprobe spectrometry
… using techniques such as the laser probe and ion microprobe. In this study, I examine the feasibility of making high-resolution, nondestructive oxygen stable isotopic analyses with precision comparable to current microbeam techniques (i.e. <1‱). Five natural and two synthetic ¹⁸O doped calcites …
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DETECTION OF MAGNETIZATION REVERSAL IN A NEODYMIUM-IRON-BORON MAGNET USING A HALL-EFFECT MICROPROBE
… examined on a small scale using a Hall-effect microprobe with an active area 75 μm on a side. Probes were made by evaporating bismuth through a stencil mask onto glass slides. Experiments were performed by placing a probe onto the polished pole face of a Nd-Fe-B magnet and inserting the …
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Electron Microprobe Study of Diabase-Granite Contact Zones in Composite Dikes, Mount Desert Island, Maine
Made available in DSpace on 2014-12-11T18:09:55Z (GMT). No. of bitstreams: 1 7121240.pdf: 2896233 bytes, checksum: 3ef43ff314bf0174515e82f8a55f24e3 (MD5) Previous issue date: 1971
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The development of the national accelerator centre proton microprobe as an analytical tool in geochemistry
This thesis describes work performed to establish and demonstrate a quantitative trace element microanalysis technique for geological material using protons accelerated by the Van de Graaff Accelerator at the National Accelerator Centre (NAC) in Faure near Cape Town. The method relies on the …
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Argon and Neon Diffusion in Lunar Impact Glass & The Development of the Electron Microprobe Zircon Fission-Track Dating Technique
<p>This dissertation is subdivided into three independent chapters on low temperature thermochronology. In chapter one a new methodology is presented for dating zircon using the fission-track technique. Chapters two and three describe experiments and modeling to determine the diffusion kinetics of …
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An assessment of the use of nuclear microprobe techniques in pollution studies : quantification of elemental concentrations in fish scales
This thesis deals with the applicability of Ion Beam Analysis (IBA) techniques for ascertaining the extent of water pollution by analyzing scales of fish that live in polluted waters. As a fish grows, ions from its immediate environment are incorporated into the matrix of the fish scale and so …
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Microprobe dating of monazite in relation to porphyroblast growth and thermodynamic modelling P-T paths for rocks affected by prolonged orogenesis
… porphyroblast. Compositional mapping and in-situ microprobe analyses of monazite grains reveal that monazite growth was the result a series of reactions or growth events. Numerous monazite grains preserve complex compositional zoning patterns that cannot be easily explained by a single monazite …
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An ion microprobe study of trace element partitioning between clinopyroxene and liquid in the diopside (CaMgSi2O6) - albite (NaAlSi3O8) - anorthite (CaAl2Si2O8) system
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1981.
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A comparison of iddingsite alteration in two terrestrial basalts and the ALHA 77005 martian meteorite using Raman spectroscopy and electron microprobe analyses.
… traverses are combined with data from electron microprobe traverses at the same locations to provide information regarding element mobility near the zones of alteration and to confirm mineral identifications made by Raman spectroscopy. This information is used along with petrographic …
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Micro PIXE analyses of Furnace and Converter Mattes for the determination of trace element distribution and concentrations
… of sensitivity are beyond that of the electron microprobe. The objective of these analyses was to examine low level concentrations (ppm or ppb) in phases such as alloys, oxides and sulphides. The analyses were done at the nuclear microprobe chamber of Material Research Group in iThemba LABS. …
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Iron oxidation in (Mg,Fe)0: Calibration of the Flank method on synthetic samples and applications on natural inclusions from lower mantle diamonds
… is to calibrate the “flank method” by electron microprobe using synthetic (Mg,Fe)O, and then apply the method to determine in situ Fe3+/Fetot in ferropericlase inclusions from lower mantle diamonds. Up to now a calibration of the flank method is available only for garnets. Initially, the flank …
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