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 231 for “"XRF"”.
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Characterising Chumash Rock Art Pigments Using Portable XRF Technology
… were to explore the viability of using XRF technology to gather information on raw materials and preparation techniques used, to differentiate between pigments and painting events, and to discuss the social implications of this information. Five Chumash rock art sites in the Windwolves …
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Geochemical Characterization of the Utica Shale Play using XRF-Based Chemostratigraphy in Ohio
… analyzed using a handheld x-ray fluorescence (HH-XRF) spectrometer along with core descriptions, x-ray diffraction (XRD) and total organic carbon (TOC) data to interpret the depositional environment. Hierarchical clustering technique was used to identify five chemofacies which reflect the …
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A MOBILE XRF SCANNER FOR A REAL-TIME ELEMENTAL IMAGING OF PAINTED ARTWORKS
… sophisticated imaging techniques. Scanning MA-XRF technique provides information on pigment materials and their distribution over the painted surface in non-invasive manner. Further, it provides information on conservation state of artworks and also their authenticity can be approached. The …
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Geochemical Characterization of the Louann Salt, Puma Field, Green Canyon, Gulf of Mexico Basin – Using XRF and XRD
… were performed by handheld X-ray fluorescence (XRF) on approximately 600 cutting samples from the Puma West GC821-002 well, ranging from 2,057 meters to 6,528 meters (6,750 feet to 21,420 feet) below the surface. X-ray diffraction (XRD) analyses were conducted on ten samples within the suture …
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XRF and the Corrosion Environment at Camp Lawton: A Comprehensive Study of the Archeological Microenvironment of a Civil War Prison Camp
… abstract: Handheld X Ray Fluorescence (XRF) technology is a new and emerging method in the field of archeology. This thesis discusses the results of XRF comparative analysis and comparative chemical analysis between a given ferrous metallic artifact's corrosion environment (the …
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Prospecting the physicochemical past. Three dimensional geochemical investigation into the use of space in Viking Age sites in southern Norway using portable XRF.
… on the use of portable X-Ray fluorescence (XRF) as a tool for archaeological geochemistry. The instrument was used as part of varied contextual, vertical and horizontal sampling strategies on three Viking Age sites in southern Norway in order to investigate archaeological geochemistry as a …
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Evaluation of X-ray Fluorescence Spectroscopy as a Tool for Element Analysis in Pea Seeds
X-ray fluorescence spectroscopy (XRF) is a powerful analytical tool for the determination of elemental composition of diverse materials. The principal aim of this study was to evaluate and characterize the utility and reliability of synchrotron-based XRF for use in element analysis of field pea …
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Composition analysis of high-Tc superconducting thin films by quantitative x-ray fluorescence
… Br, Cu, and Ca. Quantitative x-ray fluorescence (XRF) consisting of radioactive sources (secondary foil excitor 241Am-Mo source and 55Pe source), a Si(Li) detector, and a multichannel analyzer were employed. The XRF system was calibrated by using sol gel thin films of known element composition and …
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Preliminary Assessment: Identification of Chinese Drywall and Exposure to Particulate Matter and Metals during Cutting and Installation of Drywall
… of American drywall and Chinese drywall using XRF (X-Ray Fluorescence) analysis with the Innov-X XRF analyzer. The second part presents an analysis of metal exposure during cutting and installation of drywall using 8stage Cascade impactor. The work space concentration of, different metals is …
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X-ray fluorescence for quantification of lead and strontium in vivo
… and long measurement times. A portable XRF device capable of measurement of bone Pb and Sr, overcomes the limitation of the current systems and has been developed in this work. The detection limit of the portable XRF for bone Pb and Sr was found to be 11 ppm and 5 ppm respectively at 5 …
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Sensores proximais na determinação de características do solo
… - X por dispersão de energia com microfeixe (μED-XRF). Foram utilizadas 18 amostras de solos secas ao ar, peneiradas em quatro tamanhos das partículas e duas formas de preparo (pó e pastilha). Fez-se as análises de ataque sulfúrico e leituras em μED-XRF. Concluiu-se que a μED - XRF tem potencial …
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Environmental change recorded in physical and geochemical proxies over the Last Glacial Cycle from two Northland, New Zealand dune lakes: Lake Kanono and Lake Kai Iwi
… physical, sedimentological, geochemical, and μ-XRF elemental datasets, changes were identified in wind intensity and precipitation that likely correspond to regional and global climatic shifts associated with changes in intensity of the SWW and the appearance and increase in intensity of the …
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Synchrotron dendrochemistry: Exploring the comparison of multi-dimensional elemental analysis methodologies on tree cores using synchrotron techniques
… the feasibility of using X-ray fluorescence (XRF) spectroscopy to determine concentrations (i.e., ppm and ppb) of heavy metals in tree core samples. The samples used to determine this feasibility came from the arsenic (As)-laden region of Yellowknife, NT, which has had past gold mining …
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Investigating laminated sediments of the Al-Azraq basin, Jordan and the implications for paleoenvironmental variability
… lithology, smear slides, x-ray fluorescence (XRF), scanning electron microscopy (SEM) ,and energy dispersive X-ray spectroscopy (EDS) investigate the potential for laminated sediments and characterize the paleolake environments. Lithology and smear slides identified the presence of fine …
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Optical Field Instrumentation for Characterizing Particle Sampling Sensors
… particle composition with X-Ray Fluorescence (XRF) by physically sampling particles in a flow. There has been little research on applying XRF to moving particles, so experimental data were collected to demonstrate the effectiveness of the sensor. Detection comparisons between two particle types …
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Heavy metal distribution in Wrigley Head, Moston Brook, Greater Manchester,Northwest England : implications for risk assessment and remediation
… to: (a) evaluate the relationship between XRF and aqua regia/ICP-OES derived heavy metal data, (b) investigate the multiple sources of historical heavy metal contamination, (c) investigate small-scale spatial variation in heavy metal contamination across the study site, (d) assess heavy …
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X-Ray Fluorescence Analysis of Tuscaloosa Marine Shale Cuttings from Horizontally Drilled Wells
… to evaluate the effect of basic sample clean on XRF results. The data available for this study were geophysical logs and well cuttings from two lateral wells (B-NEZ 43H 001 and B-NEZ 43H 002) from Little Silver Creek Field, Tangipahoa County, Louisiana. Resistivity and total gamma are the …
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Improving on quality control methods used in commercial MEA manufacturing
… thermography (IRT) and x-ray fluorescence (XRF). A rig was successfully designed and built for the automated visual inspection and IRT and methods were successfully developed for the use of the 3 techniques in MEA fabrication. The results from the thickness and gravimetric analysis yielded …
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