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 10 of 10 for “"; Geological samples"”.
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Source distribution analysis of magnetic microscopy maps of geological samples
… currently the most sensitive magnetometers for geological samples. Standard SQUID magnetometers are able to directly estimate the net moment of a sample, while SQUID microscopes require complex inversion of maps of the magnetic field above the sample. In order to extract magnetization …
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Development of rapid techniques based on selective dissolution for the determination of the precious metals in geological samples
… of the platinumgroup elements (PGE) and gold in geological samples is described. The technique is based on selective aqua regia acid leach followed by a selective extraction (using diphenylthiourea and 1,2-dichloroethane) to separate the PGE and Au as a group from concomitant matrix elements. …
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A low dilution fusion technique for the determination of major, minor and trace elements in Lamproite and Kimberlite samples by X-ray fluorescence spectrometry
… (XRFS). This method has been used to analyze geological samples of widely varying and unusual composition such as lamproites and kimberlites. The results are shown to be of comparable if not better accuracy than other methods of sample preparation for XRFS. Analytical conditions, including …
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The Effect of Pressure on Ion Track Formation in Minerals
… Such experiments will be important for dating of geological samples using the fission-track technique. In addition, it is a question of great interest whether the energy deposition of swift heavy ions in a solid, being exposed to extreme pressure, can induce specific phase transitions. This work …
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Analysis of gas differential diffusion through porous media using prompt gamma activation analysis
… critical to predicting the movement of gases in geological media. Here I present a novel methodology for using prompt gamma activation analysis to measure the effective diffusivity of noble gases in a porous medium. I also present a model to estimate the connectivity parameter of a soil from …
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Raman spectroscopic application for the analysis of organic compounds and minerals of astrobiological significance. The detection and discrimination of organic compounds and mineral analogues in pure and mixed samples of astrobiological significance using raman spectroscopy, XRD and scanning electron microscopy
… has been used to characterise both organic and geological samples in order to build a database for the future characterization of biomarker molecules that are of astrobiological relevance. Characteristic geological features and hydrated minerals recently found on the surface of Mars by the NASA …
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Investigation of new semiconductor materials for wide band-gap devices
… content due to compositional variation in the samples. NBE broadening wasalso accompanied with intense defect luminescence attributed to oxygenated VIII complexes.Indium-gallium oxide (IGO) alloys were grown with low to high In contents with notable crystallographic phase changes from …
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Geochronology of terraced coastal deposits in Calabria and eastern Sicily: tectonic implications
… flights of coastal terraces occurring in various geological domains. These features are formed by interaction between the glacio-eustatic sea level changes and Late Quaternary uplift. Thus, by combining ages and elevations of inner edges with the OIT stages of high sea-level stands, it is possible …
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Liberation of low molecular weight organic acids from sedimentary organic matter and their role on microbial activity
… kerogen, lignite and coal. During burial and geological maturation of sedimentary macromolecular organic matter biological and abiological processes promote the liberation of LMWOAs into the surrounding sediment. Through this process, microbes in sedimentary subsurface environments are …
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The Greener Alternative: Sustainable Development in Iron Catalysis and Biodegradable Polymers
… tomography and its applications in catalysis, geological samples, and electrochemistry under conditions of use.