subject:(XRF)

Universiteit Utrecht

1. Harthoorn, J.L. Onderzoek van tekenmaterialen met technische middelen. Een literatuurstudie aangevuld met technisch onderzoek van tekeningen uit het Leidse Prentenkabinet.

Degree: 2013, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/277859

► In deze studie wordt nagegaan welke informatie kan worden verkregen door technische onderzoeksmethodes toe te passen op tekeningen. De aandacht is daarbij gericht op tekenmaterialen… (more)

Subjects/Keywords: tekeningen; tekenmateriaal; technisch onderzoek; XRF

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APA (6^th Edition):

Harthoorn, J. L. (2013). Onderzoek van tekenmaterialen met technische middelen. Een literatuurstudie aangevuld met technisch onderzoek van tekeningen uit het Leidse Prentenkabinet. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/277859

Chicago Manual of Style (16^th Edition):

Harthoorn, J L. “Onderzoek van tekenmaterialen met technische middelen. Een literatuurstudie aangevuld met technisch onderzoek van tekeningen uit het Leidse Prentenkabinet.” 2013. Masters Thesis, Universiteit Utrecht. Accessed November 15, 2019. http://dspace.library.uu.nl:8080/handle/1874/277859.

MLA Handbook (7^th Edition):

Harthoorn, J L. “Onderzoek van tekenmaterialen met technische middelen. Een literatuurstudie aangevuld met technisch onderzoek van tekeningen uit het Leidse Prentenkabinet.” 2013. Web. 15 Nov 2019.

Vancouver:

Harthoorn JL. Onderzoek van tekenmaterialen met technische middelen. Een literatuurstudie aangevuld met technisch onderzoek van tekeningen uit het Leidse Prentenkabinet. [Internet] [Masters thesis]. Universiteit Utrecht; 2013. [cited 2019 Nov 15]. Available from: http://dspace.library.uu.nl:8080/handle/1874/277859.

Council of Science Editors:

Harthoorn JL. Onderzoek van tekenmaterialen met technische middelen. Een literatuurstudie aangevuld met technisch onderzoek van tekeningen uit het Leidse Prentenkabinet. [Masters Thesis]. Universiteit Utrecht; 2013. Available from: http://dspace.library.uu.nl:8080/handle/1874/277859

Montana Tech

2. Berger, Alexis. POISONS IN THE BASEMENT: AN ANALYSIS OF X-RAY FLUORESCENCE TESTS FOR HEAVY METAL PESTICIDES IN THE UNIVERSITY OF MONTANA’S ETHNOGRAPHIC COLLECTION.

Degree: MA, 2014, Montana Tech

URL: https://scholarworks.umt.edu/etd/4348

► This thesis focuses on the X-Ray Fluorescence (XRF) testing that was performed on the University of Montana’s (UM) ethnographic collection. This collection is housed in… (more)

▼ This thesis focuses on the X-Ray Fluorescence (XRF) testing that was performed on the University of Montana’s (UM) ethnographic collection. This collection is housed in a repository in the UM Anthropological Curation Facility (UMACF). The main concern over the artifacts and the reason behind the decision to perform such testing was to determine if any hazardous pesticides were used as part of past conservation treatments on the collection over the course of its history at the University of Montana. The XRF tests were performed during the winter of 2011-2012 on over 350 artifacts. The results had been previously unanalyzed. The result of the scanning yielded 844 graphs showing the levels of nine different heavy metals and elements. These elements included arsenic, lead, mercury, bromine, barium, selenium, cadmium, chromium, and antimony, all of which can be hazardous to humans who may interact with the artifacts. Further, the presence of some of these elements, such as bromine, may indicate that items were treated with pesticides. A sample of 131 of the artifacts and 258 of the test results showed high concentrations of arsenic, lead, and antimony on a majority of the artifacts. The cause of the readings could be from a variety of means ranging from the manufacturing process of the items, environmental influences, or pesticide dust from a previous application. The pesticide lead arsenate, however, uses all three of the metals, lead, arsenic, and antimony. The presence of these three metals and the high correlation between the concentration of lead and the concentration of arsenic could be indicators that this pesticide was used in the collection. The conclusion of the testing showed that although these elements may be detected on the artifact, the results of XRF testing are inconclusive. XRF can provide researchers with the information that the element is present but lacks any method to explain the reason behind it. Further tests at the UMACF could prove vital in explaining these results. Until these additional tests are complete, caution, such as using nitrile gloves and respirators should be used in the collection when handling the artifacts.

Subjects/Keywords: artifacts; ethnography; XRF; anthropology; museum

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APA (6^th Edition):

Berger, A. (2014). POISONS IN THE BASEMENT: AN ANALYSIS OF X-RAY FLUORESCENCE TESTS FOR HEAVY METAL PESTICIDES IN THE UNIVERSITY OF MONTANA’S ETHNOGRAPHIC COLLECTION. (Masters Thesis). Montana Tech. Retrieved from https://scholarworks.umt.edu/etd/4348

Chicago Manual of Style (16^th Edition):

Berger, Alexis. “POISONS IN THE BASEMENT: AN ANALYSIS OF X-RAY FLUORESCENCE TESTS FOR HEAVY METAL PESTICIDES IN THE UNIVERSITY OF MONTANA’S ETHNOGRAPHIC COLLECTION.” 2014. Masters Thesis, Montana Tech. Accessed November 15, 2019. https://scholarworks.umt.edu/etd/4348.

MLA Handbook (7^th Edition):

Berger, Alexis. “POISONS IN THE BASEMENT: AN ANALYSIS OF X-RAY FLUORESCENCE TESTS FOR HEAVY METAL PESTICIDES IN THE UNIVERSITY OF MONTANA’S ETHNOGRAPHIC COLLECTION.” 2014. Web. 15 Nov 2019.

Vancouver:

Berger A. POISONS IN THE BASEMENT: AN ANALYSIS OF X-RAY FLUORESCENCE TESTS FOR HEAVY METAL PESTICIDES IN THE UNIVERSITY OF MONTANA’S ETHNOGRAPHIC COLLECTION. [Internet] [Masters thesis]. Montana Tech; 2014. [cited 2019 Nov 15]. Available from: https://scholarworks.umt.edu/etd/4348.

Council of Science Editors:

Berger A. POISONS IN THE BASEMENT: AN ANALYSIS OF X-RAY FLUORESCENCE TESTS FOR HEAVY METAL PESTICIDES IN THE UNIVERSITY OF MONTANA’S ETHNOGRAPHIC COLLECTION. [Masters Thesis]. Montana Tech; 2014. Available from: https://scholarworks.umt.edu/etd/4348

Delft University of Technology

3. Carlier, L.C.F. Characterization of the geological and geo-chemical footprint of the Koolhoven gold deposit, Suriname.:.

Degree: 2012, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:9f70672e-3161-40a9-ac86-e9430cf85548

► Characterization of the geological and geo-chemical footprint of the Koolhoven gold deposit, Suriname. IAMGold operates Rosebel N.V. Gold Mines in Suriname, South America. The producing… (more)

▼ Characterization of the geological and geo-chemical footprint of the Koolhoven gold deposit, Suriname. IAMGold operates Rosebel N.V. Gold Mines in Suriname, South America. The producing deposits are characterized to be Archaen greenstone hosted quartz-carbonate vein deposits. Regional exploration projects are located in rainforest environment. Geologists are therefore confronted with difficult access, few outcrops and deep weathering. Efficient exploration is crucial and for this reason a profound understanding of the local geology, gold depositional mechanism and signature is required. There is a hypothesis that a temperature gradient resulting from the flow of hydrothermal fluids through the shear and tension veins will have caused alteration halos to be formed around the gold deposit. Specific element enrichment and depletion are also expected near the gold deposition as a result of changing pressure/temperature regime and fluid characteristics. Recognizing and understanding alteration halos will increase the target area in an exploration campaign. To test this hypothesis 28 boreholes with a maximum downhole depth of 230 meters were sampled across the producing Koolhoven pit on the Rosebel concession. 85 Samples were analysed for trace element and major element content in a laboratory. 904 Samples were analysed using an X-50 Mobile XRF device for element content. 1573 Spectral measurements were obtained using a Hi-Res Terraspec and 40 thin sections were analysed using a conventional polarization microscope and electron microprobe. The petrographic analysis reveals the presence of quartz, carbonate, chlorite, pyrite, chalcopyrite, magnetite, hematite, rutile, clay mineral and feldspar including plagioclase. Bleached veins selvages are associated with high concentrations of carbonate and sericite, pyrite porphyroblasts and are devoid of chlorite. The sulfide mineral content does not exceed 5%. The conglomerate clasts are identified to be of volcanic origin mainly, hereby supporting the major element results. The veins contain quartz, carbonate, chlorite and the accessory minerals white-mica and tourmaline. Due to the low degree of deformation the veins are concluded to be of late timing compared to the main deformation. The use of major element analysis has resulted in the effective differentiation of lithologies present in the Koolhoven pit. Siltstone/mudstone, two types of greywacke (A and B), sandstone, conglomerate and volcanic rock ranging from mafic to felsic have been recognized. Greywacke B and conglomerate are spatially related and their major-element content resembles that of the volcanic rock. The use of log-ratios to analyse the trace element data suggests the presence of correlations between specific element ratios and gold concentrations. The best results were obtained by analysing one borehole a time. Different correlations are suggested in the different boreholes. It therefore remains uncertain to use the presented results for the entire deposit. The visible and near infrared spectral analysis… Advisors/Committee Members: Buxton, M.W.N..

Subjects/Keywords: gold; alteration; XRF; Suriname

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Carlier, L. C. F. (2012). Characterization of the geological and geo-chemical footprint of the Koolhoven gold deposit, Suriname.:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:9f70672e-3161-40a9-ac86-e9430cf85548

Chicago Manual of Style (16^th Edition):

Carlier, L C F. “Characterization of the geological and geo-chemical footprint of the Koolhoven gold deposit, Suriname.:.” 2012. Masters Thesis, Delft University of Technology. Accessed November 15, 2019. http://resolver.tudelft.nl/uuid:9f70672e-3161-40a9-ac86-e9430cf85548.

MLA Handbook (7^th Edition):

Carlier, L C F. “Characterization of the geological and geo-chemical footprint of the Koolhoven gold deposit, Suriname.:.” 2012. Web. 15 Nov 2019.

Vancouver:

Carlier LCF. Characterization of the geological and geo-chemical footprint of the Koolhoven gold deposit, Suriname.:. [Internet] [Masters thesis]. Delft University of Technology; 2012. [cited 2019 Nov 15]. Available from: http://resolver.tudelft.nl/uuid:9f70672e-3161-40a9-ac86-e9430cf85548.

Council of Science Editors:

Carlier LCF. Characterization of the geological and geo-chemical footprint of the Koolhoven gold deposit, Suriname.:. [Masters Thesis]. Delft University of Technology; 2012. Available from: http://resolver.tudelft.nl/uuid:9f70672e-3161-40a9-ac86-e9430cf85548

4. Boscaro, Mateus Eugenio. Determinação de elementos químicos em plásticos biodegradáveis naturais e sintéticos.

Degree: Mestrado, Energia Nuclear na Agricultura e no Ambiente, 2014, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/64/64134/tde-26012015-144429/ ;

►

Preocupações com o acúmulo de lixo plástico e seu consequente impacto ambiental levaram os cientistas e a indústria química, nas últimas décadas, a uma busca… (more)

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Preocupações com o acúmulo de lixo plástico e seu consequente impacto ambiental levaram os cientistas e a indústria química, nas últimas décadas, a uma busca por plásticos biodegradáveis e plásticos produzidos com matérias-primas de fontes renováveis. Entre eles, encontram-se o poli(ácido lático), o poli(?-caprolactona), os poli(hidroxialcanoatos), os polímeros de amido e os polímeros sintéticos que recebem aditivos que facilitam a degradação, conhecidos como oxi-biodegradáveis. Em decorrência dos processos de produção e uso de aditivos e corantes, os plásticos podem conter constituintes que não fazem parte das moléculas do polímero. Por esta razão, o objetivo do trabalho foi determinar os elementos químicos presentes em amostras de polímeros biodegradáveis, sacolas oxi-biodegradáveis e sacolas de amido distribuídas em supermercados, empregando-se análise por ativação neutrônica instrumental (INAA) e espectroscopia de fluorescência de raios X (XRF). A identificação dos polímeros das sacolas de supermercado foi realizada por espectroscopia de absorção no infravermelho com transformada de Fourier (FTIR). Os resultados das análises químicas dos polímeros não processados evidenciaram baixas concentrações dos elementos químicos. Já os plásticos das sacolas apresentaram altas concentrações de cálcio, sódio, zinco e titânio, provenientes do uso de cargas minerais, corantes e outros aditivos. Em algumas amostras, as concentrações de zinco, cobalto, cromo, molibdênio e chumbo excederam os limites estabelecidos pela norma ABNT NBR 15448-2:2008 para polímeros biodegradáveis. As análises também indicaram que os aditivos pró-oxidantes utilizados nas sacolas oxi-biodegradáveis são baseados em compostos químicos que contêm ferro. Os resultados obtidos comprovam que os plásticos biodegradáveis podem ser utilizados de forma segura em embalagens e outras aplicações, desde que se evitem os aditivos contendo elementos químicos tóxicos e outras substâncias perigosas

Concerns about the accumulation of plastic waste and its consequent environmental impact have led scientists and chemical industry, in recent decades, to search for biodegradable plastics and plastics made with renewable raw materials. Among them are included poly (lactic acid), polycaprolactone, polyhydroxyalkanoates, starch polymers and synthetic polymers having additives which facilitate degradation, known as oxo-biodegradable. Due to production processes and use of additives and dyes, plastics may contain small amounts of chemical elements that are not part of the polymer molecules. For this reason, the objective of this study was to determine chemical elements in samples of biodegradable polymers, oxy-biodegradable and starch bags distributed in supermarkets by instrumental neutron activation analysis (INAA) and X-ray fluorescence spectroscopy (XRF). The polymers of plastic bags were identified by Fourier transform infrared spectroscopy (FTIR). Results of chemical analysis of unprocessed polymers have shown low concentrations of chemical elements. On the other hand,…

Advisors/Committee Members: Fernandes, Elisabete Aparecida De Nadai.

Subjects/Keywords: FTIR; FTIR; INAA; INAA; Oxi-biodegradáveis; Oxo-biodegradable; Polímeros; XRF; XRF

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Boscaro, M. E. (2014). Determinação de elementos químicos em plásticos biodegradáveis naturais e sintéticos. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/64/64134/tde-26012015-144429/ ;

Chicago Manual of Style (16^th Edition):

Boscaro, Mateus Eugenio. “Determinação de elementos químicos em plásticos biodegradáveis naturais e sintéticos.” 2014. Masters Thesis, University of São Paulo. Accessed November 15, 2019. http://www.teses.usp.br/teses/disponiveis/64/64134/tde-26012015-144429/ ;.

MLA Handbook (7^th Edition):

Boscaro, Mateus Eugenio. “Determinação de elementos químicos em plásticos biodegradáveis naturais e sintéticos.” 2014. Web. 15 Nov 2019.

Vancouver:

Boscaro ME. Determinação de elementos químicos em plásticos biodegradáveis naturais e sintéticos. [Internet] [Masters thesis]. University of São Paulo; 2014. [cited 2019 Nov 15]. Available from: http://www.teses.usp.br/teses/disponiveis/64/64134/tde-26012015-144429/ ;.

Council of Science Editors:

Boscaro ME. Determinação de elementos químicos em plásticos biodegradáveis naturais e sintéticos. [Masters Thesis]. University of São Paulo; 2014. Available from: http://www.teses.usp.br/teses/disponiveis/64/64134/tde-26012015-144429/ ;

5. Curado, Jessica Fleury. Estudo e caracterização física de cerâmicas indígenas brasileiras.

Degree: PhD, Física, 2012, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/43/43134/tde-07082012-160635/ ;

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O presente trabalho tem por objetivo caracterizar e identificar a natureza de recursos cerâmicos brasileiros utilizando métodos físicos não destrutivos. O estudo está inserido na… (more)

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O presente trabalho tem por objetivo caracterizar e identificar a natureza de recursos cerâmicos brasileiros utilizando métodos físicos não destrutivos. O estudo está inserido na área interdisciplinar da Arqueometria e envolve a participação de pesquisadores do Museu de Arqueologia e Etnografia da Universidade de São Paulo (MAE-USP). As amostras analisadas são de grande interesse arqueológico, pois foram coletadas em uma região do Pantanal sul-matogrossense que possui um complexo processo de ocupação envolvendo diversas tradições culturais, entre as quais a tradição Guarani e a tradição Pantanal. Os fragmentos cerâmicos foram caracterizados através das técnicas de Emissão de Raios X Induzido por Partícula (PIXE) e Fluorescência de Raios X (XRF) para a determinação da composição da matriz da pasta cerâmica e através da técnica de Radiografia Computadorizada para a investigação da estrutura interna das peças. A técnica PIXE permitiu uma caracterização dos elementos majoritários encontrados na matriz cerâmica (Z<26), usados na previsão do valor da densidade da matriz. A técnica XRF foi utilizada para determinar as concentrações elementares com destaque para os elementos minoritários (Z>26, wt%<5%) presentes na pasta cerâmica. Essas técnicas, quando associadas a métodos de análise estatísticos permitiram um melhor entendimento do conjunto de amostras. Os resultados encontrados apontam uma clara diferença na composição elementar das amostras encontradas nos diferentes sítios arqueológicos e pertencentes às diferentes tradições. Com a aplicação da técnica de Radiografia as amostras foram separadas de acordo com a presença de tempero em sua estrutura e através da análise das imagens radiográficas foi determinada a densidade dos fragmentos. Neste trabalho foi possível estabelecer uma relação entre os fragmentos cerâmicos estudados às suas tradições, assim como aos sítios arqueológicos nos quais foram coletados.

The present work aims to characterize and identify the nature of Brazilian ceramics using non-destructive physical methods. The study is inserted in the interdisciplinary area of the Archaeometry and involves the participation of researchers from the Museum of Archaeology and Ethnography of the University of São Paulo (MAE-USP). The analyzed samples are of great archaeological interest, as they have been collected in a region of Pantanal in the state of Mato Grosso do sul with a complex settlement process that involves different cultural traditions like the Guarani tradition and the tradition Pantanal. The ceramic fragments were characterized through the techniques of X-ray Emission Particle-Induced (PIXE) and X-Ray Fluorescence (XRF) to determine the composition of the matrix of the ceramic paste and using the technique of Computed Radiography for the investigation of internal structure of the sherds. PIXE technique allowed a characterization of majoritarian elements found in ceramic matrix (Z < 26) and was used in the prediction of the density of the paste. XRF technique was used to determine the elemental…

Advisors/Committee Members: Added, Nemitala.

Subjects/Keywords: Archaeometry; Arqueometria; Cerâmica; PIXE; PIXE; Pottery; Radiografia; Radiography; XRF; XRF

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Curado, J. F. (2012). Estudo e caracterização física de cerâmicas indígenas brasileiras. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/43/43134/tde-07082012-160635/ ;

Chicago Manual of Style (16^th Edition):

Curado, Jessica Fleury. “Estudo e caracterização física de cerâmicas indígenas brasileiras.” 2012. Doctoral Dissertation, University of São Paulo. Accessed November 15, 2019. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-07082012-160635/ ;.

MLA Handbook (7^th Edition):

Curado, Jessica Fleury. “Estudo e caracterização física de cerâmicas indígenas brasileiras.” 2012. Web. 15 Nov 2019.

Vancouver:

Curado JF. Estudo e caracterização física de cerâmicas indígenas brasileiras. [Internet] [Doctoral dissertation]. University of São Paulo; 2012. [cited 2019 Nov 15]. Available from: http://www.teses.usp.br/teses/disponiveis/43/43134/tde-07082012-160635/ ;.

Council of Science Editors:

Curado JF. Estudo e caracterização física de cerâmicas indígenas brasileiras. [Doctoral Dissertation]. University of São Paulo; 2012. Available from: http://www.teses.usp.br/teses/disponiveis/43/43134/tde-07082012-160635/ ;

Georgia State University

6. Henson, Lanier. Surface Soil Metal and Metalloid Contamination Within the Urban Environment of Atlanta, Georgia.

Degree: MS, Geosciences, 2018, Georgia State University

URL: https://scholarworks.gsu.edu/geosciences_theses/117

► Previous research from urban cities around the world have found elevated soil lead concentrations in many of the cities because of anthropogenic deposition of… (more)

Subjects/Keywords: Atlanta; Urban Environment; Soil; Contamination; Lead; XRF

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Henson, L. (2018). Surface Soil Metal and Metalloid Contamination Within the Urban Environment of Atlanta, Georgia. (Thesis). Georgia State University. Retrieved from https://scholarworks.gsu.edu/geosciences_theses/117

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Henson, Lanier. “Surface Soil Metal and Metalloid Contamination Within the Urban Environment of Atlanta, Georgia.” 2018. Thesis, Georgia State University. Accessed November 15, 2019. https://scholarworks.gsu.edu/geosciences_theses/117.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Henson, Lanier. “Surface Soil Metal and Metalloid Contamination Within the Urban Environment of Atlanta, Georgia.” 2018. Web. 15 Nov 2019.

Vancouver:

Henson L. Surface Soil Metal and Metalloid Contamination Within the Urban Environment of Atlanta, Georgia. [Internet] [Thesis]. Georgia State University; 2018. [cited 2019 Nov 15]. Available from: https://scholarworks.gsu.edu/geosciences_theses/117.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Henson L. Surface Soil Metal and Metalloid Contamination Within the Urban Environment of Atlanta, Georgia. [Thesis]. Georgia State University; 2018. Available from: https://scholarworks.gsu.edu/geosciences_theses/117

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

7. Caliri, Claudia. A mobile xrf scanner for a real-time elemental imaging of painted artworks.

Degree: 2017, Università degli Studi di Catania

URL: http://hdl.handle.net/10761/3771

► Painted artworks are complex multi-layered materials studied over the time with several sophisticated imaging techniques. Scanning MA-XRF technique provides information on pigment materials and their… (more)

▼ Painted artworks are complex multi-layered materials studied over the time with several 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 penetrating nature of X-rays allows visualizing overpainted hidden pictorial compositions, not visible to naked eye. In the present PhD activity an advanced XRF scanning system for a real time imaging of painted artworks has been developed at the LANDIS laboratory of LNS-INFN and IBAM-CNR in Catania (Italy).The MA-XRF scanner presents a modular set-up to be assembled/disassembled in a short time (30-60 min) and easily moved in museums for analyses in situ. Spectrometric head is moved by three linear stages covering an area up to 110 × 70 × 20 cm3 (XYZ) . All motion sensors and their synchronization with the acquisition system are fully controlled by a custom developed and programmed Control Unit (CU) and all instrument operations can be in real-time monitored by a graphical user interface (GUI). The CU controls also the Z-axis movement, along the focal distance, via the communication with a laser triangulation sensor maintaining dynamically constant the painting-spectrometer distance in case of non-flat sample surface. Further, the CU interrupts immediately the scan if the safety distance is overcame. SDD detector coupled to a Digital X-ray Processors (DXP) that works in a time-list event mode (TLIST) allows to perform scans in real time (or in continuous mode). Ultra-fast scans can be performed up to 100 mm/sec covering the total area in 4.2 hours. The MA-XRF device is aimed to the macroscopic analysis of large size paintings. However, the use of a polycapillary lens equipping the X-ray source, allows to combine imaging at both the macro and micro scale of length with a simple adjustment of the sample position along the focal distance obtaining a lateral resolution up to 35 µm. A long range optical microscope is used for the accurate positioning of the painting. To date, performances of this device in terms of lateral resolution, scanning speed and dimensions of the scanning area, makes it as one of the most (or even the most) efficient portable MA-XRF systems available in the scientific community for studying paintings. X-ray spectra are processed in real-time during the scanning by the non-linear least-squares fitting procedure developed in PyMCa and integrated in the in-house programmed analysis software with a maximum processing speed of 5000 fitted spectra per second. Further a number of editing and mathematical tools for processing the images in live-mode are available. During the present research activity, the scanner was validated by studying three painted artworks on different support (canvas, wood and paper) and different size, for which the instrument has been moved in situ. MA-XRF provided valuable information through the…

Subjects/Keywords: Area 02 - Scienze fisiche; XRF Imaging technique, MA-XRF, Mobile macro-XRF scanner, Historical paintings, event-mode acquisition, painted artworks pigments, non-destructive analysis, real-time MA-XRF imaging

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Caliri, C. (2017). A mobile xrf scanner for a real-time elemental imaging of painted artworks. (Thesis). Università degli Studi di Catania. Retrieved from http://hdl.handle.net/10761/3771

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Caliri, Claudia. “A mobile xrf scanner for a real-time elemental imaging of painted artworks.” 2017. Thesis, Università degli Studi di Catania. Accessed November 15, 2019. http://hdl.handle.net/10761/3771.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Caliri, Claudia. “A mobile xrf scanner for a real-time elemental imaging of painted artworks.” 2017. Web. 15 Nov 2019.

Vancouver:

Caliri C. A mobile xrf scanner for a real-time elemental imaging of painted artworks. [Internet] [Thesis]. Università degli Studi di Catania; 2017. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/10761/3771.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Caliri C. A mobile xrf scanner for a real-time elemental imaging of painted artworks. [Thesis]. Università degli Studi di Catania; 2017. Available from: http://hdl.handle.net/10761/3771

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Royal Roads University

8. Allan, Kenneth. Urban park soils metals distribution in the Victoria area, British Columbia .

Degree: 2015, Royal Roads University

URL: http://hdl.handle.net/10170/800

► Surface soils in 20 urban parks in the Greater Victoria area were sampled and screened using a portable X-ray fluorescence (XRF) analyzer. Bioaccessibility results indicated… (more)

Subjects/Keywords: Bioaccessibility; Metals; Park; Soils; Urban; XRF

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APA (6^th Edition):

Allan, K. (2015). Urban park soils metals distribution in the Victoria area, British Columbia . (Thesis). Royal Roads University. Retrieved from http://hdl.handle.net/10170/800

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Allan, Kenneth. “Urban park soils metals distribution in the Victoria area, British Columbia .” 2015. Thesis, Royal Roads University. Accessed November 15, 2019. http://hdl.handle.net/10170/800.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Allan, Kenneth. “Urban park soils metals distribution in the Victoria area, British Columbia .” 2015. Web. 15 Nov 2019.

Vancouver:

Allan K. Urban park soils metals distribution in the Victoria area, British Columbia . [Internet] [Thesis]. Royal Roads University; 2015. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/10170/800.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Allan K. Urban park soils metals distribution in the Victoria area, British Columbia . [Thesis]. Royal Roads University; 2015. Available from: http://hdl.handle.net/10170/800

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Cranfield University

9. Dunster, Joanna Margaret. Developing a methodology for the non-destructive analysis of British soft-paste porcelain.

Degree: PhD, 2016, Cranfield University

URL: http://dspace.lib.cranfield.ac.uk/handle/1826/12766 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.738619

► Soft-paste porcelain was produced in Britain in great quantities between the mid-18th and early 19th centuries. Due to industrial secrecy and the complexities of creating… (more)

Subjects/Keywords: X-ray fluorescence (XRF); Porcelain; Ceramics

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APA (6^th Edition):

Dunster, J. M. (2016). Developing a methodology for the non-destructive analysis of British soft-paste porcelain. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/12766 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.738619

Chicago Manual of Style (16^th Edition):

Dunster, Joanna Margaret. “Developing a methodology for the non-destructive analysis of British soft-paste porcelain.” 2016. Doctoral Dissertation, Cranfield University. Accessed November 15, 2019. http://dspace.lib.cranfield.ac.uk/handle/1826/12766 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.738619.

MLA Handbook (7^th Edition):

Dunster, Joanna Margaret. “Developing a methodology for the non-destructive analysis of British soft-paste porcelain.” 2016. Web. 15 Nov 2019.

Vancouver:

Dunster JM. Developing a methodology for the non-destructive analysis of British soft-paste porcelain. [Internet] [Doctoral dissertation]. Cranfield University; 2016. [cited 2019 Nov 15]. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/12766 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.738619.

Council of Science Editors:

Dunster JM. Developing a methodology for the non-destructive analysis of British soft-paste porcelain. [Doctoral Dissertation]. Cranfield University; 2016. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/12766 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.738619

Boston University

10. Sparling, Loren Tai. Ceramics and the Central Lydia Archaeological Survey (CLAS): a diachronic study using portable X-ray fluorescence (pXRF).

Degree: 2014, Boston University

URL: http://hdl.handle.net/2144/14308

► This Master's project explores the viability of portable XRF (pXRF) for the purposes of identifying the chemical signatures of ceramics collected as part of archaeological… (more)

Subjects/Keywords: Archaeology; CLAS; Lydia; XRF; Ceramics; Survey

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APA (6^th Edition):

Sparling, L. T. (2014). Ceramics and the Central Lydia Archaeological Survey (CLAS): a diachronic study using portable X-ray fluorescence (pXRF). (Thesis). Boston University. Retrieved from http://hdl.handle.net/2144/14308

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sparling, Loren Tai. “Ceramics and the Central Lydia Archaeological Survey (CLAS): a diachronic study using portable X-ray fluorescence (pXRF).” 2014. Thesis, Boston University. Accessed November 15, 2019. http://hdl.handle.net/2144/14308.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sparling, Loren Tai. “Ceramics and the Central Lydia Archaeological Survey (CLAS): a diachronic study using portable X-ray fluorescence (pXRF).” 2014. Web. 15 Nov 2019.

Vancouver:

Sparling LT. Ceramics and the Central Lydia Archaeological Survey (CLAS): a diachronic study using portable X-ray fluorescence (pXRF). [Internet] [Thesis]. Boston University; 2014. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/2144/14308.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sparling LT. Ceramics and the Central Lydia Archaeological Survey (CLAS): a diachronic study using portable X-ray fluorescence (pXRF). [Thesis]. Boston University; 2014. Available from: http://hdl.handle.net/2144/14308

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

11. Raninen, Linn. Metallförorenade bottensediment : En undersökning av fem sjöar påverkade av metallutvinning i Bergslagen och i Västerbottens inland.

Degree: Ecology and Environmental Sciences, 2017, Umeå University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-133405

► This study aims to assess the potential environmental risks posed by sediments in five lakes affected by present or historical metallurgy. Special attention is… (more)

Subjects/Keywords: Lakes; Sediment; Tailings; XRF; Environmental Sciences; Miljövetenskap

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APA (6^th Edition):

Raninen, L. (2017). Metallförorenade bottensediment : En undersökning av fem sjöar påverkade av metallutvinning i Bergslagen och i Västerbottens inland. (Thesis). Umeå University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-133405

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Raninen, Linn. “Metallförorenade bottensediment : En undersökning av fem sjöar påverkade av metallutvinning i Bergslagen och i Västerbottens inland.” 2017. Thesis, Umeå University. Accessed November 15, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-133405.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Raninen, Linn. “Metallförorenade bottensediment : En undersökning av fem sjöar påverkade av metallutvinning i Bergslagen och i Västerbottens inland.” 2017. Web. 15 Nov 2019.

Vancouver:

Raninen L. Metallförorenade bottensediment : En undersökning av fem sjöar påverkade av metallutvinning i Bergslagen och i Västerbottens inland. [Internet] [Thesis]. Umeå University; 2017. [cited 2019 Nov 15]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-133405.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Raninen L. Metallförorenade bottensediment : En undersökning av fem sjöar påverkade av metallutvinning i Bergslagen och i Västerbottens inland. [Thesis]. Umeå University; 2017. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-133405

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

12. Nieuwenhuizen, M.C. Virtual reconstruction of hidden paintings based on XRF images:.

Degree: 2010, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:114d170e-f6ec-4551-b406-01f9dd08d18e

► This thesis presents a method that uses the chemical information visualized by XRF images to reconstruct hidden compositions: paintings that are buried beneath a surface… (more)

Subjects/Keywords: Painting; XRF; Classification; Image Processing; Reconstruction

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APA (6^th Edition):

Nieuwenhuizen, M. C. (2010). Virtual reconstruction of hidden paintings based on XRF images:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:114d170e-f6ec-4551-b406-01f9dd08d18e

Chicago Manual of Style (16^th Edition):

Nieuwenhuizen, M C. “Virtual reconstruction of hidden paintings based on XRF images:.” 2010. Masters Thesis, Delft University of Technology. Accessed November 15, 2019. http://resolver.tudelft.nl/uuid:114d170e-f6ec-4551-b406-01f9dd08d18e.

MLA Handbook (7^th Edition):

Nieuwenhuizen, M C. “Virtual reconstruction of hidden paintings based on XRF images:.” 2010. Web. 15 Nov 2019.

Vancouver:

Nieuwenhuizen MC. Virtual reconstruction of hidden paintings based on XRF images:. [Internet] [Masters thesis]. Delft University of Technology; 2010. [cited 2019 Nov 15]. Available from: http://resolver.tudelft.nl/uuid:114d170e-f6ec-4551-b406-01f9dd08d18e.

Council of Science Editors:

Nieuwenhuizen MC. Virtual reconstruction of hidden paintings based on XRF images:. [Masters Thesis]. Delft University of Technology; 2010. Available from: http://resolver.tudelft.nl/uuid:114d170e-f6ec-4551-b406-01f9dd08d18e

Colorado School of Mines

13. Wood, Julia Bellamy. Regional geology and chemostratigraphy of the Fort Hays Member of the Niobrara Formation, Western Interior, USA.

Degree: MS(M.S.), Geology and Geological Engineering, 2017, Colorado School of Mines

URL: http://hdl.handle.net/11124/170971

► The Late Cretaceous (89.5-82 Ma) Niobrara Formation is the primary target for hydrocarbon development in many fields throughout Colorado. The formation is composed of two… (more)

▼ The Late Cretaceous (89.5-82 Ma) Niobrara Formation is the primary target for hydrocarbon development in many fields throughout Colorado. The formation is composed of two members: the basal Fort Hays Limestone and the overlying Smoky Hill Member. Historically, production has centered on the Smoky Hill Member but recent success in the Fort Hays Limestone has sparked interest in this underlying unit. Compared to the Smoky Hill Member, the Fort Hays Limestone is markedly different in lithology, sedimentology, and elemental composition. Through detailed core descriptions, measured outcrop sections, XRF analysis, thin section petrography, and FESEM analysis, this study develops a better understanding of the unique depositional history that characterizes the Fort Hays. In order to assess regional changes, five cores and five outcrops were utilized to represent the Fort Hays on a depositional basin scale. Sedimentologically, the Fort Hays Limestone is characterized by rhythmic bedding of chalk and marl which represent climatic fluctuations that result from perturbations in the Earth’s orbit around the sun (i.e. Milankovitch cycles). Chalks were deposited during times of arid climate when siliciclastic input from the Sevier highlands was minimal and carbonate production was enhanced. Chalks are characterized by extensive bioturbation suggesting well-oxygenated benthic conditions. Conversely, marls were deposited under humid conditions where increased terrestrial runoff from the Sevier highlands diluted ongoing carbonate production. Marls are characterized by a laminite sedimentary fabric suggesting that benthic conditions were less-oxygenated and unable to support benthic fauna. Ichnological observations reveal that the Fort Hays Limestone is characterized by high frequency cycles of rapid oxygenation and deoxygenation. In the field, outcrops were measured for total Fort Hays and individual bed thicknesses and described for lithologic changes. Western outcrops exhibit changes in lithology from base to top that suggest an overall rise in sea level. Scour surfaces in the westernmost outcrops suggest a higher energy environment during marl deposition. The absence of these surfaces to the east in Hays, Kansas suggests a quieter, lower energy environment. Elemental data from X-ray fluorescence (XRF) were used to generate spatial elemental concentration maps for the Western Interior Seaway during Fort Hays time. This data suggests that detrital elements (Al, Si, Zr, and K) are primarily sourced from the west and northwest with an additional southwest source during humid climates. Carbonate elements were brought up from the south via Gulfian currents. Finally, a manganese anomaly found exclusively in the Fort Hays appears to originate from the north. The element is thought to be enriched in sea water at this time as a result of increased sea floor spreading and carried down to the basin via Arctic currents. The Fort Hays Limestone is characterized by a unique depositional history that resulted in the regional lithological… Advisors/Committee Members: Sonnenberg, Stephen A. (advisor), Anderson, Donna S. (committee member), French, Marsha (committee member), Sarg, J. F. (J. Frederick) (committee member).

Subjects/Keywords: Fort Hays; Niobrara; Chemostratigraphy; XRF; Manganese

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APA (6^th Edition):

Wood, J. B. (2017). Regional geology and chemostratigraphy of the Fort Hays Member of the Niobrara Formation, Western Interior, USA. (Masters Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170971

Chicago Manual of Style (16^th Edition):

Wood, Julia Bellamy. “Regional geology and chemostratigraphy of the Fort Hays Member of the Niobrara Formation, Western Interior, USA.” 2017. Masters Thesis, Colorado School of Mines. Accessed November 15, 2019. http://hdl.handle.net/11124/170971.

MLA Handbook (7^th Edition):

Wood, Julia Bellamy. “Regional geology and chemostratigraphy of the Fort Hays Member of the Niobrara Formation, Western Interior, USA.” 2017. Web. 15 Nov 2019.

Vancouver:

Wood JB. Regional geology and chemostratigraphy of the Fort Hays Member of the Niobrara Formation, Western Interior, USA. [Internet] [Masters thesis]. Colorado School of Mines; 2017. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/11124/170971.

Council of Science Editors:

Wood JB. Regional geology and chemostratigraphy of the Fort Hays Member of the Niobrara Formation, Western Interior, USA. [Masters Thesis]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/170971

Université de Grenoble

14. Parsons, Christopher. Distribution et mobilité de l'arsenic dans les sols : effets de cycles redox successifs : Distribution and mobility of arsenic in soils and sediments : the effects of redox cycling.

Degree: Docteur es, Sciences de la Terre et de l'Univers et de l'Environnement, 2011, Université de Grenoble

URL: http://www.theses.fr/2011GRENU029

►

L'arsenic est un metalloïde toxique et cancérigène. Ubiquiste dans la pedosphere, il est très sensibleaux fluctuations des conditions redox du sol, ce qui influe significativement… (more)

▼

L'arsenic est un metalloïde toxique et cancérigène. Ubiquiste dans la pedosphere, il est très sensibleaux fluctuations des conditions redox du sol, ce qui influe significativement sa toxicité et mobilité. Nousétudions le cycle biogéochimique global de l'arsenic, en tenant compte de l'usage croissant des ressources, etpassons en revue l'importance respective de l’arsenic geogénique et anthropogénique dans l’environnement.La contamination à l’arsenic est souvent diffuse dans les bassins sédimentaires de l'Europe. Cependant, desconcentrations dans l'eau interstitielle du sol peuvent être élevées lors de périodes de saturation du solcausées par la monté des eaux souterraines ou les inondations, prévues d'augmenter dû aux changementsclimatiques. La spectrométrie de fluorescence X quantitative et sans standard a été utilisée pour analyserl'arsenic dans des sols relativement contaminés de la plaine alluviale de la Saône au moyen de protocoles depréparation d'échantillons conçus pour optimiser la précision d'analyse et l'exactitude in situ aux bassesconcentrations d'arsenic. L'arsenic dans ces sols est associe aux (hydr)oxydes du fer et de manganèse de lataille d'argile colloïdale. Ceux-ci subissent une dissolution réductrice par les microorganismes lors desinondations, libérant une importante concentration d'arsenic dans la phase aqueuse. Si, par la suite, l'arsenicdégagé n'est pas éliminé avec l'eau de crue évacuée, il est ré-immobilisé pendant l'oxydation du sol et lareprécipitation des oxydes métalliques. Grâce à une combinaison novatrice d'analyses chimiques par voiehumide, d’écologie microbienne, de spectroscopie ainsi que de modélisation thermodynamique et cinétique,nous démontrons que les cycles d'oxydo-réduction séquentiels entraînent une atténuation d'arsenic aqueuxdans des conditions réductrices dû à la coprécipitation croissante, et a une diminution de l'activitémicrobienne causée par l’appauvrissement en matière organique labile. Des processus d'atténuationsimilaires sont observés en l'absence d'activité microbienne pour Cr et As dans des argiles pyriteuses lorsquecelles-ci sont exposés aux oscillations redox provoquées par l'ajout de substances humiques réduites. Ainsi,nous montrons que les effets cumulatifs de cycles redox successifs sont extrêmement importants pour lamobilité de divers contaminants dans l'environnement.

Arsenic is a toxic and carcinogenic metalloid, ubiquitous in the pedosphere and highly sensitive tofluctuations in soil redox conditions which dramatically influence both its toxicity and mobility. We reviewthe global biogeochemical cycle of arsenic in light of increasing resource usage and re-evaluate theimportance of anthropogenic and geogenic arsenic inputs to the exogenic cycle. Arsenic contamination isoften diffuse in European sedimentary basins. Despite this, concentrations in soil pore-water may be highduring periods of soil saturation caused by rising groundwater or surface flooding which is predicted toincrease due to climatic change. Standardless quantitative X-ray fluorescence…

Advisors/Committee Members: Charlet, Laurent (thesis director), Roman-Ross, Gabriela (thesis director).

Subjects/Keywords: Arsenic; Inondation; Redox; XRF; Contamination; PHREEQC; Cyclage redox; FeOOH; Arsenic; Flooding; XRF; Contamination; Redox cycling; FP-XRF; PHREEQC; Ciclos redox; Arsénico; FP-XRF; PXRF; Inundaciones; FeOOH; PHREEQC; 550

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APA (6^th Edition):

Parsons, C. (2011). Distribution et mobilité de l'arsenic dans les sols : effets de cycles redox successifs : Distribution and mobility of arsenic in soils and sediments : the effects of redox cycling. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2011GRENU029

Chicago Manual of Style (16^th Edition):

Parsons, Christopher. “Distribution et mobilité de l'arsenic dans les sols : effets de cycles redox successifs : Distribution and mobility of arsenic in soils and sediments : the effects of redox cycling.” 2011. Doctoral Dissertation, Université de Grenoble. Accessed November 15, 2019. http://www.theses.fr/2011GRENU029.

MLA Handbook (7^th Edition):

Parsons, Christopher. “Distribution et mobilité de l'arsenic dans les sols : effets de cycles redox successifs : Distribution and mobility of arsenic in soils and sediments : the effects of redox cycling.” 2011. Web. 15 Nov 2019.

Vancouver:

Parsons C. Distribution et mobilité de l'arsenic dans les sols : effets de cycles redox successifs : Distribution and mobility of arsenic in soils and sediments : the effects of redox cycling. [Internet] [Doctoral dissertation]. Université de Grenoble; 2011. [cited 2019 Nov 15]. Available from: http://www.theses.fr/2011GRENU029.

Council of Science Editors:

Parsons C. Distribution et mobilité de l'arsenic dans les sols : effets de cycles redox successifs : Distribution and mobility of arsenic in soils and sediments : the effects of redox cycling. [Doctoral Dissertation]. Université de Grenoble; 2011. Available from: http://www.theses.fr/2011GRENU029

Cranfield University

15. Dunster, J. M. Developing a methodology for the non-destructive analysis of British soft-paste porcelain.

Degree: 2016, Cranfield University

URL: http://dspace.lib.cranfield.ac.uk/handle/1826/12766

► Soft-paste porcelain was produced in Britain in great quantities between the mid-18th and early 19th centuries. Due to industrial secrecy and the complexities of creating… (more)

Subjects/Keywords: X-ray fluorescence (XRF); Porcelain; Ceramics

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dunster, J. M. (2016). Developing a methodology for the non-destructive analysis of British soft-paste porcelain. (Thesis). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/12766

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Dunster, J M. “Developing a methodology for the non-destructive analysis of British soft-paste porcelain.” 2016. Thesis, Cranfield University. Accessed November 15, 2019. http://dspace.lib.cranfield.ac.uk/handle/1826/12766.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Dunster, J M. “Developing a methodology for the non-destructive analysis of British soft-paste porcelain.” 2016. Web. 15 Nov 2019.

Vancouver:

Dunster JM. Developing a methodology for the non-destructive analysis of British soft-paste porcelain. [Internet] [Thesis]. Cranfield University; 2016. [cited 2019 Nov 15]. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/12766.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Dunster JM. Developing a methodology for the non-destructive analysis of British soft-paste porcelain. [Thesis]. Cranfield University; 2016. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/12766

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

16. Koller, Kryštof. Porovnání metod pro měření tloušťky vrstev na tvarově složitých a multivrstevnatých dílech .

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/173474

► Práce se zabývá metodami pro měření tloušťky kovových vrstev na polymerních, tvarově složitých a multivrstevnatých dílech. Praktická část zahrnuje nalezení optimální metody po zohlednění časové… (more)

Subjects/Keywords: pokovování plastů; XRF; CCC; světelná mikroskopie; plating on plastics; XRF; CCC; light microscopy

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APA (6^th Edition):

Koller, K. (2019). Porovnání metod pro měření tloušťky vrstev na tvarově složitých a multivrstevnatých dílech . (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/173474

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Koller, Kryštof. “Porovnání metod pro měření tloušťky vrstev na tvarově složitých a multivrstevnatých dílech .” 2019. Thesis, Brno University of Technology. Accessed November 15, 2019. http://hdl.handle.net/11012/173474.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Koller, Kryštof. “Porovnání metod pro měření tloušťky vrstev na tvarově složitých a multivrstevnatých dílech .” 2019. Web. 15 Nov 2019.

Vancouver:

Koller K. Porovnání metod pro měření tloušťky vrstev na tvarově složitých a multivrstevnatých dílech . [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/11012/173474.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Koller K. Porovnání metod pro měření tloušťky vrstev na tvarově složitých a multivrstevnatých dílech . [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/173474

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Estado do Rio de Janeiro

17. Ayxa Nara de Souza Rezier. Uso da técnica de EDXRF na análise de gemas semi preciosas brasileiras.

Degree: Master, 2017, Universidade do Estado do Rio de Janeiro

URL: http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=10948 ;

►

O Brasil é um dos maiores e mais importantes produtores de gemas do planeta, além de destacar-se pela qualidade e variedade gemológica. Possui um amplo… (more)

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O Brasil é um dos maiores e mais importantes produtores de gemas do planeta, além de destacar-se pela qualidade e variedade gemológica. Possui um amplo e diversificado cenário produtivo abrangendo principalmente o mercado externo, tendo como principais setores de consumo a joalheria e a indústria de lapidação, além de uma ampla gama de utilização nas indústrias eletrônica, siderúrgica, elétrica, óptica, instrumentação, artesanato e agricultura. Com o avanço tecnológico, os estudos e pesquisas mineralógicos são de extrema importância para o entendimento das propriedades físico-químicas, a identificação e a caracterização química e estrutural das gemas, pois o emprego das gemas na indústria é função da sua composição elementar. No projeto desenvolvido, foram realizadas caracterizações elementares em amostras de algumas gemas brasileiras mediante a utilização da técnica de Fluorescência de Raios X por Dispersão em Energia (EDXRF). A determinação qualitativa de elementos teve como objetivo principal de analisar e verificar possíveis presenças de elementos e impurezas que não fazem parte da composição elementar pertencente à classe dos silicatos e carbonatos. As análises foram realizadas em dois equipamentos portáteis diferentes, o mini-XRF da Amptek e o ARTAX 200 da Bruker, com programas de aquisição e análise dos dados desses fabricantes. Os minerais analisados foram: Ametista, Calcita laranja, Ônix, Jade, Citrino, Quartzo incolor, Quartzo leitoso, Quartzo azul, Quartzo verde e Quartzo rosa. Verificou-se a existência de íons metálicos, em especial metais de transição como Ti, Cr, Mn, Fe, Co, Ni e Cu. As possíveis razões para a existência destes íons são discutidas no trabalho. Os dados das análises elementares por EDXRF indicam coerência nas composições elementares obtidos com os dois sistemas portáteis de XRF e observa-se que ambos apresentam eficiência em relação aos elementos analisados, indicando que a técnica pode ser utilizada para auxiliar no desenvolvimento de estudos mineralógicos.

Brazil is one of the largest and most important producers of gemstones on the planet, besides being distinguished by the quality and gemological variety. It has a wide and diversified production scenario covering mainly the foreign market, with the main consumer sectors being jewelery and the stoning industry, as well as a wide range of use in the electronics, steel, electrical, optics, instrumentation, handicrafts and agriculture industries. With the technological advance, mineralogical studies and research are extremely important for the understanding of physicochemical properties, identification and chemical and structural characterization of gemstones, since the use of gemstones in industry is a function of their elemental composition. In the developed project, elemental characterizations were performed in samples of some Brazilian gems using the Energy Dispersion X-Ray Fluorescence technique (EDXRF). The qualitative determination of elements had as main objective to analyze and verify possible presence of elements and…

Advisors/Committee Members: Joaquim Teixeira de Assis, Mauro Cesar Geraldes, Gil de Carvalho, Carlos Ivan Ribeiro de Oliveira, Antônio Brunetti.

Subjects/Keywords: XRF; Fluorescência; APLICACOES DE RADIOISOTOPOS; Raios X; Caracterização; Pedras preciosas; Gemas (Mineralogia); Fluorescence; XRF; Gems; X-Ray; Characterization

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rezier, A. N. d. S. (2017). Uso da técnica de EDXRF na análise de gemas semi preciosas brasileiras. (Masters Thesis). Universidade do Estado do Rio de Janeiro. Retrieved from http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=10948 ;

Chicago Manual of Style (16^th Edition):

Rezier, Ayxa Nara de Souza. “Uso da técnica de EDXRF na análise de gemas semi preciosas brasileiras.” 2017. Masters Thesis, Universidade do Estado do Rio de Janeiro. Accessed November 15, 2019. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=10948 ;.

MLA Handbook (7^th Edition):

Rezier, Ayxa Nara de Souza. “Uso da técnica de EDXRF na análise de gemas semi preciosas brasileiras.” 2017. Web. 15 Nov 2019.

Vancouver:

Rezier ANdS. Uso da técnica de EDXRF na análise de gemas semi preciosas brasileiras. [Internet] [Masters thesis]. Universidade do Estado do Rio de Janeiro; 2017. [cited 2019 Nov 15]. Available from: http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=10948 ;.

Council of Science Editors:

Rezier ANdS. Uso da técnica de EDXRF na análise de gemas semi preciosas brasileiras. [Masters Thesis]. Universidade do Estado do Rio de Janeiro; 2017. Available from: http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=10948 ;

Uppsala University

18. Åberg, Susanna. XRF-analys av atmosfäriskt stoft från en löss-sekvens i Ungern från den senaste istiden.

Degree: Earth Sciences, 2017, Uppsala University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326048

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Stoft är ett eoliskt, klastiskt silt-material som blåst från exponerade områden via atmosfären och avsätts i form av löss-sekvenser på andra ställen i världen.… (more)

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Stoft är ett eoliskt, klastiskt silt-material som blåst från exponerade områden via atmosfären och avsätts i form av löss-sekvenser på andra ställen i världen. Dessa sekvenser utgör ett naturligt arkiv som innehåller information om tidigare förändringar i klimatet ända bak till kvartärtidens början för ungefär 2.5 miljoner år sedan. Mycket av stoftet i Europa avsattes under senaste istiden som var för cirka hundra tusen till tio tusen år sedan. En löss-sekvens är lokaliserad i Madaras i södra Ungern och är tio meter tjock, för det här projektet har stoft-prover från sekvensen analyserats med röntgenstrålning. Analysen visar vilka och vilken halt av grundämnen som stoftproverna från de olika nivåerna innehåller, vilket i sin tur hjälper till att rekonstruera klimat från den senaste istiden. Röntgenstrålningen har genererats av en apparat som heter Brukar S1 Titan och utför metoden XRF som står för X-ray Flourescence, vilken har utförts på Geocentrum på Uppsala Universitet. Tolkning av resultatet samt jämförelse med tidigare forskning ska hjälpa till att förstå klimatförändringar från senaste istiden genom att undersöka vittring och ursprungskälla. Resultatet indikerar på att information om klimat är bevarat i sekvensen, då slutsatsen är att vittring har haft en svag men tydlig effekt på stoftet som avsatts i Madaras, och att ändringar av stoftets ursprungskälla inte har påverkat den studerade sekvensen.

Dust is aeolian, clastic silt material that has been eroded from exposed land surfaces, blown via the atmosphere and deposited as loess sequences in other areas in the world. Loess contains information about changes in the climate all the way back to the beginning of the Quaternary, approximately 2.5 million years ago. Research shows that a lot of the European dust was deposited during the last glacial of the Quaternary period, which was from approximately one hundred thousand to ten thousand years ago. One loess sequence is located in Madaras in southern Hungary and is 10 meters thick, in this project, dust samples from the sequence have been analyzed with XRF (X-ray Flourescence). The analysis shows which and what percentage of elements the samples contain, which in turn will help to reconstruct climate from the last glacial. The analysis was conducted using a XRF machine called Bruker S1 Titan and was done at Uppsala University in Uppsala, Sweden. Interpreting of the results, as well as comparing with earlier research, will help to understand climate changes from the latest glacial by examine weathering and dust source. The result indicates that information about past climate is preserved at the site, because of the conclusion that says that weathering has had a weak but distinct effect on the dust deposited at Madaras, and that the dust source changes do not have affected the studied sequence.

Subjects/Keywords: climate changes; dust; loess; Hungary; XRF; klimatförändringar; stoft; löss; Ungern; XRF; Earth and Related Environmental Sciences; Geovetenskap och miljövetenskap

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Åberg, S. (2017). XRF-analys av atmosfäriskt stoft från en löss-sekvens i Ungern från den senaste istiden. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326048

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Åberg, Susanna. “XRF-analys av atmosfäriskt stoft från en löss-sekvens i Ungern från den senaste istiden.” 2017. Thesis, Uppsala University. Accessed November 15, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326048.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Åberg, Susanna. “XRF-analys av atmosfäriskt stoft från en löss-sekvens i Ungern från den senaste istiden.” 2017. Web. 15 Nov 2019.

Vancouver:

Åberg S. XRF-analys av atmosfäriskt stoft från en löss-sekvens i Ungern från den senaste istiden. [Internet] [Thesis]. Uppsala University; 2017. [cited 2019 Nov 15]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326048.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Åberg S. XRF-analys av atmosfäriskt stoft från en löss-sekvens i Ungern från den senaste istiden. [Thesis]. Uppsala University; 2017. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326048

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

19. De Langhe, Kaatje. Beyond the beam : evaluation and application of handheld X-ray fluorescence in archaeology.

Degree: 2015, Ghent University

URL: http://hdl.handle.net/1854/LU-6715561

► The starting point of this project was to bridge the gap between the Departments of Analytical Chemistry and Archaeology. Archaeology has evolved from a more… (more)

▼ The starting point of this project was to bridge the gap between the Departments of Analytical Chemistry and Archaeology. Archaeology has evolved from a more historically and art-historically orientated field of research to a fully emancipated science, comfortably adopting GIS, 3D modelling and chemical analysis to serve its own needs. The rapidly evolving field of XRF (X-ray fluorescence) analysis and the development of a new generation of lightweight, high-performance handheld XRF analysers promised new possibilities for in situ elemental determination. The primary aim of this research project was to evaluate the applicability of such a handheld XRF analyser when used in archaeological contexts and to develop a comprehensible protocol for data-processing. To fulfil these objectives, the Olympus Innov-X handheld XRF analyser was obtained and characterised and a work methodology was developed applying established lab protocols used in analytical chemistry. This instrument was then employed in three archaeological case studies where it investigated respectively the provenance of post-medieval Flemish stove-tiles, the origin and distribution of Iron Age red-painted pottery from Mount Kemmel and related sites, and the geochemical composition of archaeological soil features in the Yustyd valley (Russia) during excavations in 2011. The research combined different XRF techniques, with a central role for handheld XRF spectrometry in all selected archaeological applications. In addition, the measurements of both µ-XRF (micro-XRF) and TXRF (Total Reflection XRF) were used to act as a point of reference for the handheld measurements, since reference materials for the archaeological materials under focus are not available, and Raman spectroscopy was used to characterize the pigment in the red-painted pottery. Methodology and characterization of handheld XRF analysers The first part of this thesis consists of three chapters which deal with X-ray fluorescence in general and the instrumentation and methodology that were used in this work. These chapters serve as an introduction to and point of reference for the rest of the thesis. Chapter 1 (Introduction) introduces the research and provides a broader context by placing it in the general evolution of XRF analysis in archaeology and by discussing current issues concerning the validity of handheld XRF. The chosen research strategy and the aims and objectives of this research are also discussed. Chapter 2 (Methodology) provides an overview of the instrumentation that was used in this research and the sample preparation and data processing techniques that were applied per instrument and project. The methodology is applicable to the three archaeological test cases. Chapter 3 (Evaluation of commercial handheld XRF: selecting the right tool for archaeological research) describes the evaluation of six commercially available handheld XRF analysers. The instruments are tested on their performance, stability and ease of use, using a set of standard reference materials and archaeological… Advisors/Committee Members: Vandenabeele, Peter, De Clercq, Wim, Vincze, Laszlo.

Subjects/Keywords: Chemistry; Altai; Kemmel; Flanders; red-painted pottery; stove-tiles; X-ray fluorescence; archaeology; µ-XRF spectroscopy; handheld XRF analysis; hXRF

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

De Langhe, K. (2015). Beyond the beam : evaluation and application of handheld X-ray fluorescence in archaeology. (Thesis). Ghent University. Retrieved from http://hdl.handle.net/1854/LU-6715561

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

De Langhe, Kaatje. “Beyond the beam : evaluation and application of handheld X-ray fluorescence in archaeology.” 2015. Thesis, Ghent University. Accessed November 15, 2019. http://hdl.handle.net/1854/LU-6715561.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

De Langhe, Kaatje. “Beyond the beam : evaluation and application of handheld X-ray fluorescence in archaeology.” 2015. Web. 15 Nov 2019.

Vancouver:

De Langhe K. Beyond the beam : evaluation and application of handheld X-ray fluorescence in archaeology. [Internet] [Thesis]. Ghent University; 2015. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/1854/LU-6715561.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

De Langhe K. Beyond the beam : evaluation and application of handheld X-ray fluorescence in archaeology. [Thesis]. Ghent University; 2015. Available from: http://hdl.handle.net/1854/LU-6715561

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

20. Batista Pessoa, Walter. Probing chalcogenide films by advanced X-ray metrology for the semiconductor industry : Développement des protocoles de métrologie des nouveaux matériaux chalcogénures pour l'industrie des semi-conducteurs.

Degree: Docteur es, Physique des accélérateurs, 2018, Paris Saclay

URL: http://www.theses.fr/2018SACLS330

► Les nouveaux matériaux de type chalcogénures (à base de S, Se, Te) font l’objet d’un intérêt croissant, non seulement pour les applications mémoires avancées, photonique… (more)

▼ Les nouveaux matériaux de type chalcogénures (à base de S, Se, Te) font l’objet d’un intérêt croissant, non seulement pour les applications mémoires avancées, photonique et photovoltaïque, mais également autour des matériaux dichalcogénures innovants à base de métaux de transition (MoS₂, WS₂, ..). Les propriétés de ces matériaux, réalisés sous forme d’alliages binaires ou ternaires, avec ou sans dopage, dépendent fortement de leur composition, du profil de composition dans ces couches très fines, ainsi que des conditions de surface et d’interface (préparation, passivation). La maîtrise des propriétés de ces couches fines, déposées par voie chimique (CVD) ou par co-pulvérisation cathodique magnétron, doit s’appuyer sur des nouveaux protocoles de caractérisation aux incertitudes optimisées et compatibles avec un contrôle de fabrication en ligne. Dans cette thèse, nous présentons les performances de protocoles de métrologie spécifiquement développés pour l’analyse de couches minces de chalcogénures. Ces protocoles, qui s’appuient essentiellement sur les techniques non destructives de spectroscopie de photoélectrons (XPS) et de fluorescence X (XRF), ont été optimisés pour la caractérisation surfacique des couches ultrafines, l’analyse quantitative de la composition des matériaux complexes à base de tellure ou de soufre, et la mesure du profil de composition dans des couches et empilements < 50 nm. Dans un premier temps, nous présentons l’étude par XPS quasi in situ des propriétés de surface des matériaux Ge, Sb, Te ainsi que de leurs composés binaires et ternaires. Nous mettons en évidence l’évolution de la surface après remise à l’air puis vieillissement, et nous comparons l’efficacité de stratégies d’encapsulation in situ de couches minces à base de Te et Se. Nous démontrons ensuite les performances de protocoles d’analyses par XRF à dispersion de longueur d’onde (WDXRF) et XPS pour la quantification précise de la composition chimique de composés Ge-Sb-Te (de 1 à 200 nm) et de couches ultrafines de dichalcogénures à base de métaux de transition (MoS₂, WS₂). L’analyse combinée WDXRF/XPS permet de mesurer l’évolution avec la composition des facteurs de sensibilité relative des composantes Ge3d, Te4d et Sb4d, et par conséquent d’améliorer la précision de mesure par XPS de la composition des matériaux à changement de phase de type GexSbyTez. Nous soulignons également l’influence des effets de matrice sur la capacité de la WDXRF à l’analyse quantitative de l’azote dans des matériaux Ge-Sb-Te. Nous évaluons la possibilité d’un étalonnage de la WDXRF fondé sur des analyses par faisceaux d’ions spécifiques, ce qui permet in fine un suivi en ligne de couches GeSbTeN dans une fenêtre procédé donnée. Enfin, nous présentons deux stratégies de caractérisation non destructive du profil de composition dans des couches minces de chalcogénures. D’une part, nous démontrons que la combinaison des techniques de XRF en géométrie d'incidence rasante (GIXRF) et de réflectométrie X (XRR) permet une mise en évidence non ambiguë de faibles… Advisors/Committee Members: Lépy, Marie-Christine (thesis director).

Subjects/Keywords: Chalcogénures; Métrologie des rayons-X; XRF; XPS; Mémoires; Matériaux 2-D; Chalcogenides; X-rays metrology; XRF; XPS; Memories; 2-D materials

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Batista Pessoa, W. (2018). Probing chalcogenide films by advanced X-ray metrology for the semiconductor industry : Développement des protocoles de métrologie des nouveaux matériaux chalcogénures pour l'industrie des semi-conducteurs. (Doctoral Dissertation). Paris Saclay. Retrieved from http://www.theses.fr/2018SACLS330

Chicago Manual of Style (16^th Edition):

Batista Pessoa, Walter. “Probing chalcogenide films by advanced X-ray metrology for the semiconductor industry : Développement des protocoles de métrologie des nouveaux matériaux chalcogénures pour l'industrie des semi-conducteurs.” 2018. Doctoral Dissertation, Paris Saclay. Accessed November 15, 2019. http://www.theses.fr/2018SACLS330.

MLA Handbook (7^th Edition):

Batista Pessoa, Walter. “Probing chalcogenide films by advanced X-ray metrology for the semiconductor industry : Développement des protocoles de métrologie des nouveaux matériaux chalcogénures pour l'industrie des semi-conducteurs.” 2018. Web. 15 Nov 2019.

Vancouver:

Batista Pessoa W. Probing chalcogenide films by advanced X-ray metrology for the semiconductor industry : Développement des protocoles de métrologie des nouveaux matériaux chalcogénures pour l'industrie des semi-conducteurs. [Internet] [Doctoral dissertation]. Paris Saclay; 2018. [cited 2019 Nov 15]. Available from: http://www.theses.fr/2018SACLS330.

Council of Science Editors:

Batista Pessoa W. Probing chalcogenide films by advanced X-ray metrology for the semiconductor industry : Développement des protocoles de métrologie des nouveaux matériaux chalcogénures pour l'industrie des semi-conducteurs. [Doctoral Dissertation]. Paris Saclay; 2018. Available from: http://www.theses.fr/2018SACLS330

University of Utah

21. Bradbury, Christopher David. Rapid reconnaissance methods of investigation for trace components in deep-sea sediments.

Degree: MS, Geology & Geophysics, 2012, University of Utah

URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1921/rec/2023

► Rapid reconnaissance methodologies are useful in investigations of deep-sea sediments,as they require little time for analysis and small amounts of sample material. This is especiallyuseful… (more)

▼ Rapid reconnaissance methodologies are useful in investigations of deep-sea sediments,as they require little time for analysis and small amounts of sample material. This is especiallyuseful for new studies of old cores drilled decades ago, which have become quite depleted. BothQuantitative Evaluation of Minerals by SCANning electron microscopy (QEMSCAN®) andhandheld X-ray Fluorescence (XRF) instruments are ideally suited for such studies, as samplescan be as small as 1 cc, and both are capable of rapidly detecting trace components within thesesmall samples. Such speed allows multiple core horizons of interest to be analyzed for studies inpaleoclimatology, extraterrestrial fluxes, and sediment velocity.Grain-size and mineralogy of Ocean Drilling Program (ODP) Hole 722B are investigatedusing QEMSCAN® and compared to standard methodologies. QEMSCAN®-based grain-size,which indicates changes in paleowind strength due to the Indian Ocean summer monsoon for thelast 200 ka, correlates well with previous data. Mineralogy is found to not correlate as well,however: dolomite has a good correlation, clays and feldspars a medium correlation, and quartz apoor correlation.Handheld XRF is used for rapid reconnaissance of LL44-GPC3 and Canterbury Basinsediments from IODP Leg 317. Nickel-rich sediments are found in LL44-GPC3 at ~11.1 mbsf and~12.4 mbsf, corresponding to layers known to have extraterrestrial nickel-rich spinel and knownimpact events at Chesapeake Bay and Popigai. Canterbury Basin sediment elemental peak countsare compared to velocity measurements of the same sediment, to establish the first conclusiveivdemonstration of carbonate cementation increasing velocities in siliciclastic sediments. For eachsample, the handheld XRF measurement establishes its position on the sand-shale continuum, aswell as the relative amount of calcite cementation. Determination of cementation occurring inporous sands with high velocities is shown, and linked to fluid flow in the region. Both studiesillustrate the usefulness of handheld XRF as a reconnaissance methodology for detectingextremely subtle mineralogical signals within deep-sea sediments.

Subjects/Keywords: Bolide; Deep-sea; Paleoclimate; Qemscan; Sediment Velocity; XRF

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bradbury, C. D. (2012). Rapid reconnaissance methods of investigation for trace components in deep-sea sediments. (Masters Thesis). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1921/rec/2023

Chicago Manual of Style (16^th Edition):

Bradbury, Christopher David. “Rapid reconnaissance methods of investigation for trace components in deep-sea sediments.” 2012. Masters Thesis, University of Utah. Accessed November 15, 2019. http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1921/rec/2023.

MLA Handbook (7^th Edition):

Bradbury, Christopher David. “Rapid reconnaissance methods of investigation for trace components in deep-sea sediments.” 2012. Web. 15 Nov 2019.

Vancouver:

Bradbury CD. Rapid reconnaissance methods of investigation for trace components in deep-sea sediments. [Internet] [Masters thesis]. University of Utah; 2012. [cited 2019 Nov 15]. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1921/rec/2023.

Council of Science Editors:

Bradbury CD. Rapid reconnaissance methods of investigation for trace components in deep-sea sediments. [Masters Thesis]. University of Utah; 2012. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1921/rec/2023

University of Minnesota

22. Rush, Robert Allen. High Resolution geochemical XRF data from Elk Lake, Minnesota: A Holocene paleoclimate record from varved lacustrine sediments.

Degree: MS, Geological sciences, 2010, University of Minnesota

URL: http://purl.umn.edu/102718

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University of Minnesota M.S. thesis. September 2010. Major: Geological sciences. Advisor: Erik T. Brown. 1 computer file (PDF); x, 138 pages, appendix p. 131-138

The… (more)

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University of Minnesota M.S. thesis. September 2010. Major: Geological sciences. Advisor: Erik T. Brown. 1 computer file (PDF); x, 138 pages, appendix p. 131-138

The study of Holocene climate change is vital to understanding present and future climate conditions in the Upper Midwest region of the United States. Varved sediments from Elk Lake, Clearwater County, Minnesota provide an archive of multiple climate sensitive proxies and past climate conditions, particularly related to the balance of precipitation and evaporation (available moisture) for the North Central United States. Studies conducted in the past using Elk Lake sediments have established large scale and long term changes in the climate history of the region, but were done at a resolution that only allowed for a discussion of events on time scales of hundreds to thousands of years. Scanning XRF is a new analytical technique that allows for much higher resolution, geochemical data to be gathered from sediment cores for the characterization of climate variability with resolution on the order of decades to inter-annual changes. This study seeks to repeat, using new analytical and higher resolution methods, the work done by previous researchers. One centimeter resolution XRF scans were used to describe changes that occurred during the Holocene, and 200 micron scans were used to identify the nature of varve deposition during major periods in the Holocene and to characterize the timing and relationships between the laminations that make up individual varves. With higher resolution data with which to work, time series analysis provides insight into high frequency cycles during the Holocene record including El Nino Southern Oscillation (ENSO) and solar activity cycles. With the addition of the first known geophysical data set from Elk Lake, this study also illustrates the usefulness of obtaining multiple records from an individual lake. Through the use of both geochemical and geophysical data, it is shown that events seen separately in each data set can be correlated to one another and an accurate estimate for the timing of major climate events can be obtained.

Advisors/Committee Members: Erik T. Brown.

Subjects/Keywords: Holocene climate; Climate conditions; Higher resolution; XRF scans; Sediments; Geological Sciences

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rush, R. A. (2010). High Resolution geochemical XRF data from Elk Lake, Minnesota: A Holocene paleoclimate record from varved lacustrine sediments. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/102718

Chicago Manual of Style (16^th Edition):

Rush, Robert Allen. “High Resolution geochemical XRF data from Elk Lake, Minnesota: A Holocene paleoclimate record from varved lacustrine sediments.” 2010. Masters Thesis, University of Minnesota. Accessed November 15, 2019. http://purl.umn.edu/102718.

MLA Handbook (7^th Edition):

Rush, Robert Allen. “High Resolution geochemical XRF data from Elk Lake, Minnesota: A Holocene paleoclimate record from varved lacustrine sediments.” 2010. Web. 15 Nov 2019.

Vancouver:

Rush RA. High Resolution geochemical XRF data from Elk Lake, Minnesota: A Holocene paleoclimate record from varved lacustrine sediments. [Internet] [Masters thesis]. University of Minnesota; 2010. [cited 2019 Nov 15]. Available from: http://purl.umn.edu/102718.

Council of Science Editors:

Rush RA. High Resolution geochemical XRF data from Elk Lake, Minnesota: A Holocene paleoclimate record from varved lacustrine sediments. [Masters Thesis]. University of Minnesota; 2010. Available from: http://purl.umn.edu/102718

23. Quinn, Philip. Quantification de minéraux dans des comprimés pharmaceutiques de multivitamines par XRF et LIBS.

Degree: M. Sc. A., Génie chimique, 2015, Université de Sherbrooke

URL: http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_6720.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/6720/1/Quinn_Philip_MScA_2015.pdf

► La technique ICP-AES (Inductively-Coupled Plasma Atomic Emission Spectroscopy) est fréquemment appliquée comme méthode de contrôle de la qualité dans l'industrie pharmaceutique pour vérifier le contenu… (more)

▼ La technique ICP-AES (Inductively-Coupled Plasma Atomic Emission Spectroscopy) est fréquemment appliquée comme méthode de contrôle de la qualité dans l'industrie pharmaceutique pour vérifier le contenu en minéraux de comprimés de multivitamines. C’est une méthode très fiable et éprouvée, mais elle nécessite une longue préparation des échantillons qui réduit l'efficacité du laboratoire. Les techniques XRF (X-Ray Fluorescence) et LIBS (Laser Induced Breakdown Spectroscopy) sont des technologies étudiées afin de déterminer leur potentiel comme une approche alternative à la quantification rapide des minéraux. Leur utilisation permettrait d’économiser sur des consommables dispendieux et nocifs, d’économiser du temps de laboratoire et de quarantaines pour les produits finis. L’objectif de l’étude est de quantifier 10 minéraux dans des comprimés pharmaceutiques avec une précision qui respecte les standards de l’industrie en question. Des méthodes d’analyse appropriées à chacune des technologies évaluées sont proposées pour effectuer une quantification optimale des minéraux. Pour ce faire, une méthodologie adéquate a été développée pour la technologie LIBS permettant de tenir compte de la micro-hétérogénéité des échantillons pharmaceutiques. La méthode permet de déterminer la probabilité d’échantillonnage en fonction des tailles de particules pour chacune des espèces. Ensuite, des modèles quantitatifs multivariés et univariés ont été comparés pour chacune des technologies d’analyse. Il a été démontré que les algorithmes de régression multivariés ne sont pas significativement plus performants que les méthodes traditionnelles pour l’analyse des spectres obtenus. Par contre, en comparant les deux technologies d’analyse, XRF permet d’obtenir des erreurs de prédiction inférieures (MEP = 15 %) à LIBS (MEP = 30 %) ainsi que des courbes de calibration significativement plus linéaires. Toutefois, quoique la technologie LIBS semble obtenir des performances inférieures en général, elle promet certains avantages pour des applications futures telles que les possibilités suivantes : 1- faire du profilage en trois dimensions, 2- échantillonner de très faibles quantités et 3- n’avoir aucune préparation d’échantillon. Au final, LIBS offre davantage de forces pour des applications d’échantillons homogènes ou en profilage alors que XRF serait préférable pour les échantillons hétérogènes. Suite aux efforts de développement de modèles quantitatifs, une analyse des effets de matrice pour la technologie LIBS a permis d’évaluer l’effet de diverses propriétés des matrices en fonction de l’intensité LIBS observée. La concentration volumique élémentaire, la conductivité thermique, la masse volumique des comprimés et la proportion molaire élémentaire dans le plasma sont toutes des propriétés ayant montré des corrélations importantes (R2 ≥ 0.5) avec l’intensité LIBS. En ce qui concerne l’applicabilité au niveau industriel, les erreurs de prédiction obtenues pour les technologies XRF et LIBS ne rencontrent pas les standards pharmaceutiques faisant… Advisors/Committee Members: Gosselin, Ryan, Abatzoglou, Nicolas.

Subjects/Keywords: XRF; LIBS; Quantification; Comprimés pharmaceutiques; Multivitamines; Modèle d'échantillonnage; Effets de matrice

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APA (6^th Edition):

Quinn, P. (2015). Quantification de minéraux dans des comprimés pharmaceutiques de multivitamines par XRF et LIBS. (Masters Thesis). Université de Sherbrooke. Retrieved from http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_6720.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/6720/1/Quinn_Philip_MScA_2015.pdf

Chicago Manual of Style (16^th Edition):

Quinn, Philip. “Quantification de minéraux dans des comprimés pharmaceutiques de multivitamines par XRF et LIBS.” 2015. Masters Thesis, Université de Sherbrooke. Accessed November 15, 2019. http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_6720.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/6720/1/Quinn_Philip_MScA_2015.pdf.

MLA Handbook (7^th Edition):

Quinn, Philip. “Quantification de minéraux dans des comprimés pharmaceutiques de multivitamines par XRF et LIBS.” 2015. Web. 15 Nov 2019.

Vancouver:

Quinn P. Quantification de minéraux dans des comprimés pharmaceutiques de multivitamines par XRF et LIBS. [Internet] [Masters thesis]. Université de Sherbrooke; 2015. [cited 2019 Nov 15]. Available from: http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_6720.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/6720/1/Quinn_Philip_MScA_2015.pdf.

Council of Science Editors:

Quinn P. Quantification de minéraux dans des comprimés pharmaceutiques de multivitamines par XRF et LIBS. [Masters Thesis]. Université de Sherbrooke; 2015. Available from: http://www.collectionscanada.gc.ca/obj/thesescanada/vol2/QSHERU/TC-QSHERU-11143_6720.pdf ; http://savoirs.usherbrooke.ca/bitstream/11143/6720/1/Quinn_Philip_MScA_2015.pdf

24. Däcker, Bjarne. Drömmar i kras : Analys av glasfragment från Birkas hamn.

Degree: Archaeological Research Laboratory, 2016, Stockholm University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-139632

► This essay reports from a study using XRF of thirteen glass fragments found in the harbour of the Viking town of Birka some interesting… (more)

Subjects/Keywords: Birka XRF glass

…RAÄ 119 - Svarta jorden 3.5 Röntgenflourescens Röntgenflourescens (XRF) innebär… …x29;. En körning med XRF resulterar i en lista av värden som kan illustreras av ett… …4. 6. Slutsatser Röntgenfluorescens, XRF, är en utomordentligt teknik för att analysera…

11 more images…

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APA (6^th Edition):

Däcker, B. (2016). Drömmar i kras : Analys av glasfragment från Birkas hamn. (Thesis). Stockholm University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-139632

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Däcker, Bjarne. “Drömmar i kras : Analys av glasfragment från Birkas hamn.” 2016. Thesis, Stockholm University. Accessed November 15, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-139632.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Däcker, Bjarne. “Drömmar i kras : Analys av glasfragment från Birkas hamn.” 2016. Web. 15 Nov 2019.

Vancouver:

Däcker B. Drömmar i kras : Analys av glasfragment från Birkas hamn. [Internet] [Thesis]. Stockholm University; 2016. [cited 2019 Nov 15]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-139632.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Däcker B. Drömmar i kras : Analys av glasfragment från Birkas hamn. [Thesis]. Stockholm University; 2016. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-139632

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

25. Keene, Joshua Lake. Geoarchaeology, Paleoecology, and Holocene Subsistence Change on the Upper Snake River Plain, Idaho.

Degree: 2016, Texas A&M University

URL: http://hdl.handle.net/1969.1/159000

► This dissertation presents new data on geochronology, site formation processes, projectile-point typology, and lithic technological organization in the Intermountain West?s Snake River Plain and Bonneville… (more)

▼ This dissertation presents new data on geochronology, site formation processes, projectile-point typology, and lithic technological organization in the Intermountain West?s Snake River Plain and Bonneville Basin, relating diachronic change in lithic artifacts to paleoenvironmental changes. This research is divided into three related articles, first focusing on site formation processes at the Pioneer site of southeastern Idaho. This study provides an example of the archaeological and paleoclimatic value of studying alluvial stratigraphic sequences in arid environments. Stratigraphic analyses were used to date mid-late Holocene archaeological horizons, as well as contribute to the late Quaternary geomorphic history of the Big Lost River drainage. There is also evidence of a high-energy erosional event at ~3800 years ago indicating a large middle Holocene flood. Next, this dissertation updates the geochronology of strata from Veratic Rockshelter, southeastern Idaho, to contribute to the diagnostic projectile point typology of the upper Snake River Plain. Results indicate that Western Stemmed Tradition points at Veratic are younger and more morphologically diverse than previously thought. In addition, Elko point forms coeval with Northern Side Notched points are found to pre-date the classic age range of Elko. Finally, an analysis of dart point variability shows a distinct drop in diversity during the late Holocene. This research concludes with a comparison of lithic assemblages from Veratic and Bonneville Estates (eastern Nevada) rockshelters, focusing on how paleoecological ?crises? affected subsistence, lithic technological organization and raw material procurement. Results show that changes in aridity during the Holocene correspond with relative changes in raw material preference, ground stone use, bifacial stage of reduction, and formal vs. informal tools use at both sites. However, increased variability in raw material preference at Bonneville Estates potentially relates to the harsher, more variable and patchy ecological conditions of the Bonneville Basin compared to the more homogenous sagebrush steppe of the Snake River Plain. Ultimately, this dissertation provides geoarchaeological and geochronogical contexts for important Snake River Plain archaeological sites, providing a better understanding of prehistoric subsistence and mobility for the Snake River Plain and neighboring regions and the relation of these adaptations to climatic change. Advisors/Committee Members: Goebel, Ted (advisor), Waters, Michael (committee member), Tchakerian, Vatche (committee member), Madsen, David (committee member).

Subjects/Keywords: archaeology; geoarchaeology; Snake River Plain; lithic technology; XRF; paleoecology

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APA (6^th Edition):

Keene, J. L. (2016). Geoarchaeology, Paleoecology, and Holocene Subsistence Change on the Upper Snake River Plain, Idaho. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/159000

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Keene, Joshua Lake. “Geoarchaeology, Paleoecology, and Holocene Subsistence Change on the Upper Snake River Plain, Idaho.” 2016. Thesis, Texas A&M University. Accessed November 15, 2019. http://hdl.handle.net/1969.1/159000.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Keene, Joshua Lake. “Geoarchaeology, Paleoecology, and Holocene Subsistence Change on the Upper Snake River Plain, Idaho.” 2016. Web. 15 Nov 2019.

Vancouver:

Keene JL. Geoarchaeology, Paleoecology, and Holocene Subsistence Change on the Upper Snake River Plain, Idaho. [Internet] [Thesis]. Texas A&M University; 2016. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/1969.1/159000.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Keene JL. Geoarchaeology, Paleoecology, and Holocene Subsistence Change on the Upper Snake River Plain, Idaho. [Thesis]. Texas A&M University; 2016. Available from: http://hdl.handle.net/1969.1/159000

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Colorado

26. Mayhew, Lisa Ellen. Geological Production And Microbial Consumption of Hydrogen During Low-Temperature Water-Rock Reactions.

Degree: PhD, Geological Sciences, 2012, University of Colorado

URL: http://scholar.colorado.edu/geol_gradetds/41

► Geologically derived hydrogen gas supports hydrothermal vent ecosystems on Earth today and may have been an abundant energy source available during the origin and… (more)

▼ Geologically derived hydrogen gas supports hydrothermal vent ecosystems on Earth today and may have been an abundant energy source available during the origin and evolution of early life on Earth. The existence of deep subsurface microbial ecosystems is dependent on the ability of the water-rock environment to provide a suitable habitat for life, which has not been well quantified. This dissertation provides insights into the potential for low temperature water-rock reaction systems to support H₂-utilizing microbial life and, in turn, for microbial activity to directly affect the water-rock reaction pathways and processes. The partitioning of Fe into secondary minerals is an important control on the generation of H2. However, characterization of these phases is hampered by the small amount of reaction products generated in laboratory scale experiments. A synchrotron x-ray based method integrating micro-spectroscopy and micro-XRF data collection and processing was developed to characterize the speciation of Fe in the rare, microscale solid phase reaction products. In H₂- generating experiments conducted at 100°C, Fe(III)-oxides were detected on the surface of spinel particles, while Fe(II)-brucites and talcs were associated with dissolving olivine and pyroxene surfaces. The spinels may be required to mediate electron transfer between Fe(II) and water. Thus, H2-generation is likely a surface controlled process catalyzed by spinels and accommodated by the formation of Fe(III)-oxides. In such a system, microbial colonization of reactive surfaces may be strongly controlled by the heterogeneous distribution of H2 production. To determine if an Archaeal methanogen present in-situ would affect the solid and aqueous geochemistry of water-rock reactions in distinct ways, a water-basalt system amended with Fe⁰ was inoculated with a methanogen. The reaction products in the abiotic experiment were dominated by Fe-phyllosilicates in contrast to the culture experiment in which an Febearing pyroxene was detected and Fe-phyllosilicates were absent. The unique secondary mineral assemblage in the presence of an active methanogen suggests that H₂-utilizing microorganisms do influence the reaction pathways. Therefore, the work presented in this dissertation has helped to advance our understanding of low-temperature water-rock reactions and the potential for microbial activity to survive in and affect these systems. Advisors/Committee Members: Alexis S. Templeton, G. Lang Farmer, Andy M. Martin.

Subjects/Keywords: hydrogen; methanogenesis; serpentinization; spinel; XANES; XRF; Biogeochemistry; Geochemistry; Geology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mayhew, L. E. (2012). Geological Production And Microbial Consumption of Hydrogen During Low-Temperature Water-Rock Reactions. (Doctoral Dissertation). University of Colorado. Retrieved from http://scholar.colorado.edu/geol_gradetds/41

Chicago Manual of Style (16^th Edition):

Mayhew, Lisa Ellen. “Geological Production And Microbial Consumption of Hydrogen During Low-Temperature Water-Rock Reactions.” 2012. Doctoral Dissertation, University of Colorado. Accessed November 15, 2019. http://scholar.colorado.edu/geol_gradetds/41.

MLA Handbook (7^th Edition):

Mayhew, Lisa Ellen. “Geological Production And Microbial Consumption of Hydrogen During Low-Temperature Water-Rock Reactions.” 2012. Web. 15 Nov 2019.

Vancouver:

Mayhew LE. Geological Production And Microbial Consumption of Hydrogen During Low-Temperature Water-Rock Reactions. [Internet] [Doctoral dissertation]. University of Colorado; 2012. [cited 2019 Nov 15]. Available from: http://scholar.colorado.edu/geol_gradetds/41.

Council of Science Editors:

Mayhew LE. Geological Production And Microbial Consumption of Hydrogen During Low-Temperature Water-Rock Reactions. [Doctoral Dissertation]. University of Colorado; 2012. Available from: http://scholar.colorado.edu/geol_gradetds/41

27. Παπανδρεόπουλος, Παναγιώτης. Διερεύνηση της φυσικοχημικής συμπεριφοράς και των μηχανισμών των προϊόντων επιφανειακής διάβρωσης κραμάτων χαλκού με καταστρεπτικές και μη μεθόδους.

Degree: 2012, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/28069

►

The aim of this doctoral thesis was to investigate the surface corrosion products of copper alloys by non-destructive methods and correlate them with their bulk… (more)

▼

The aim of this doctoral thesis was to investigate the surface corrosion products of copper alloys by non-destructive methods and correlate them with their bulk composition. Copper was the first widely used metal in the history of mankind and the "Bronze Age" in Greece lasted between 3200 - 1050 BC. The results of this survey are intended to contribute to the determination of the chemical composition of copper objects (e.g. archaeological but also of any other category) from which is restricted because of their rarity or due to other reasons, to take samples from the bulk for analysis. In the experimental part of the thesis, initially ancient bronze objects (swords of type Naue II and spears) from the Greek and Albanian area of the Late Bronze Age (12 century BC) were investigated, the compositions of which were analysed by AAS and ICP- AES. At some of these objects EDXRF analyses were done on their corroded surfaces, which differed significantly from the corresponding AAS and this fact triggered the present investigation. Specimens from industrial alloys, the compositions of which approached those of the ancient objects mainly of the Bronze Age, were corroded for predetermined times by 4 different types of corrosion, 3 of which concerned the approach to the soil corrosion, because in that most of ancient objects were found. Furthermore, the corrosion in a salt spray chamber was studied in order to approximate the corrosion in a marine environment. Soil corrosion, apart from the burial was also approached by the immmersion of specimens in "soil simulation solution" and because corrosion within it was extremely slow, specimens were immersed in solution which contained a ratio 1/1 soil simulation solution and ammoniacal buffering solution of pH = 10, which in the present work is briefly referred as "corrosive solution". The surface composition of the corroded specimens versus time was analysed by the non-destructive techniques of XRF and SEM-EDX. A comparative evaluation of the results was done and and correlation with the alloys bulk composition, which apart from these techniques was also analysed by the destructive techniques of AAS and ICP-AES.

Η παρούσα διδακτορική διατριβή είχε σκοπό τη διερεύνηση των προϊόντων επιφανειακής διάβρωσης κραμάτων χαλκού με μη καταστρεπτικές μεθόδους και τη συσχέτιση τους με τη σύσταση του κύριου όγκου τους. Ο χαλκός ήταν το πρώτο ευρέως χρησιμοποιούμενο μέταλλο στην ιστορία της ανθρωπότητας και η «Εποχή του Χαλκού» στον Ελλαδικό χώρο διήρκησε μεταξύ 3200 - 1050 π.Χ. Τα αποτελέσματα της έρευνας αυτής στόχο έχουν να συμβάλουν στον προσδιορισμό της χημικής σύστασης χάλκινων αντικειμένων (π.χ. αρχαιολογικών αλλά και οποιασδήποτε άλλης κατηγορίας) από τα οποία δεν επιτρέπεται, λόγω της σπανιότητας τους ή εξαιτίας άλλων λόγων, να ληφθούν δείγματα από τον κύριο όγκο τους για ανάλυση. Στο πειραματικό μέρος της διδακτορικής διατριβής αρχικά διερευνώνται αρχαία χάλκινα αντικείμενα (ξίφη τύπου Naue II και λόγχες) από τον Ελληνικό και Αλβανικό χώρο της Ύστερης Εποχής του Χαλκού (12 αι.…

Subjects/Keywords: Διάβρωση; Χαλκός; ΜΠΡΟΥΝΤΖΟΣ; SEM-EDX; XRF; COOPER; BRONZE; Corrosion

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APA (6^th Edition):

Παπανδρεόπουλος, . �. (2012). Διερεύνηση της φυσικοχημικής συμπεριφοράς και των μηχανισμών των προϊόντων επιφανειακής διάβρωσης κραμάτων χαλκού με καταστρεπτικές και μη μεθόδους. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/28069

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Παπανδρεόπουλος, Παναγιώτης. “Διερεύνηση της φυσικοχημικής συμπεριφοράς και των μηχανισμών των προϊόντων επιφανειακής διάβρωσης κραμάτων χαλκού με καταστρεπτικές και μη μεθόδους.” 2012. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed November 15, 2019. http://hdl.handle.net/10442/hedi/28069.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Παπανδρεόπουλος, Παναγιώτης. “Διερεύνηση της φυσικοχημικής συμπεριφοράς και των μηχανισμών των προϊόντων επιφανειακής διάβρωσης κραμάτων χαλκού με καταστρεπτικές και μη μεθόδους.” 2012. Web. 15 Nov 2019.

Vancouver:

Παπανδρεόπουλος �. Διερεύνηση της φυσικοχημικής συμπεριφοράς και των μηχανισμών των προϊόντων επιφανειακής διάβρωσης κραμάτων χαλκού με καταστρεπτικές και μη μεθόδους. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2012. [cited 2019 Nov 15]. Available from: http://hdl.handle.net/10442/hedi/28069.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Παπανδρεόπουλος �. Διερεύνηση της φυσικοχημικής συμπεριφοράς και των μηχανισμών των προϊόντων επιφανειακής διάβρωσης κραμάτων χαλκού με καταστρεπτικές και μη μεθόδους. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2012. Available from: http://hdl.handle.net/10442/hedi/28069

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universiteit Utrecht

28. Olivier, N.J. Characterization of the spatial distribution of iron- and manganese oxides in the Sterksel Formation at the Maalbeek quarry, The Netherlands.

Degree: 2012, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/257677

► Iron and manganese oxides are common components in subsurface environments. They influence the groundwater flow, sediment chemistry and contaminant transport. The oxides can form coatings… (more)

▼ Iron and manganese oxides are common components in subsurface environments. They influence the groundwater flow, sediment chemistry and contaminant transport. The oxides can form coatings on the surface of sand particles and thereby provide a reactive interface between mineral grains and groundwater. Concentrations of iron and manganese oxides can be very high in sediments. Because of their adsorption capacity, naturally occurring iron- and manganese-bearing phases are known to strongly influence the transfer of inorganic species and ionizable organic compounds. This project has focused on the spatial distribution and concentration of iron oxides and total iron in the Sterksel Formation. This formation was deposited by the Rhine during the colder intervals in the middle Pleistocene. The studied site is the Maalbeek quarry in Limburg. At this site, the formation consists mostly of coarse sand and pebbles, and has a highly heterogeneous distribution of iron and manganese. This study is aimed to characterize the spatial distribution of iron and manganese within the sediment at this quarry. Three different methods have been used to quantify the concentration of iron and other components. The Citrate- Bicarbonate Dithionite method was used to extract the reactive iron from the sediment. Ingestion with aqua regia was used to extract acid soluble iron, manganese and other metals from the sediment. Measurements with XRF were done to get a view on the total composition of the sediment. The outer layer of coating of the grains was mainly measured. In general, enrichment in oxides is in the lower parts of the formation. Manganese oxides are very locally enriched in thin layers and are in a range of 5.42 ppm to 589 ppm manganese. Reactive iron concentrations were measured in the range from 139 to 3000 ppm, and total iron concentrations range from 515 to 515 to 71000 ppm. It is argued that the actual reactive iron concentration should in many cases be higher than measured here. Possible reasons for the low concentrations are shortage of reagents, incomplete dissolution due to crystallinity of oxides and degradation of dithionite. The iron measured by XRF is in the range of 1335 to 12406 ppm. This is a higher value than the aqua regia measured iron because mainly the coating was measured and not the entire sand grains. An overestimation might occur here because the lighter elements are underestimated relative to the heavier elements. The total iron distribution has a lognormal distribution and the reactive and XRF-measured iron has a bimodal distribution. There is a weak correlation between iron and manganese, a reason could be that manganese has a very local enrichment compared to iron. There is a strong iron-titanium correlation, suggesting presence of ilmenite in the sediment. Iron-silicon measured by XRF has a negative correlation; this could be because the iron oxides form coatings around the grains. The distinguish between reactive and non-reactive iron was estimated with theFe2O3/Al2O3 ratio and by comparing the iron… Advisors/Committee Members: Behrends, T, Griffioen, J.

Subjects/Keywords: Geowetenschappen; iron, manganese, geostatistics, aqua regia, XRF, CBD method

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Olivier, N. J. (2012). Characterization of the spatial distribution of iron- and manganese oxides in the Sterksel Formation at the Maalbeek quarry, The Netherlands. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/257677

Chicago Manual of Style (16^th Edition):

Olivier, N J. “Characterization of the spatial distribution of iron- and manganese oxides in the Sterksel Formation at the Maalbeek quarry, The Netherlands.” 2012. Masters Thesis, Universiteit Utrecht. Accessed November 15, 2019. http://dspace.library.uu.nl:8080/handle/1874/257677.

MLA Handbook (7^th Edition):

Olivier, N J. “Characterization of the spatial distribution of iron- and manganese oxides in the Sterksel Formation at the Maalbeek quarry, The Netherlands.” 2012. Web. 15 Nov 2019.

Vancouver:

Olivier NJ. Characterization of the spatial distribution of iron- and manganese oxides in the Sterksel Formation at the Maalbeek quarry, The Netherlands. [Internet] [Masters thesis]. Universiteit Utrecht; 2012. [cited 2019 Nov 15]. Available from: http://dspace.library.uu.nl:8080/handle/1874/257677.

Council of Science Editors:

Olivier NJ. Characterization of the spatial distribution of iron- and manganese oxides in the Sterksel Formation at the Maalbeek quarry, The Netherlands. [Masters Thesis]. Universiteit Utrecht; 2012. Available from: http://dspace.library.uu.nl:8080/handle/1874/257677

Universiteit Utrecht

29. Jansen, S. X-ray fluorescence microanalysis Instrumental capabilities and application to Archaean cherts.

Degree: 2010, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/179374

► This thesis describes the results of an analytical study into µ-XRF spectroscopy and capabilities of the technique, aimed at applications in geological research. Background, principles… (more)

▼ This thesis describes the results of an analytical study into µ-XRF spectroscopy and capabilities of the technique, aimed at applications in geological research. Background, principles and a brief history of XRF spectrometry are explained, a theoretical account is given of the interaction between X-rays and target material, and the components needed for XRF application on micro-scale are described. Tests were performed to explore parameter settings of the instrument that would yield optimum results for various analytical purposes. The results indicate that (1) an amplifier time of 6.4 µs produces optimum peak resolution for qualitative analysis, (2) voltages of 20-30 keV and currents up to 600 µA are most suitable for qualitative analysis, (3) reproducible data can be obtained for quantitative analysis, (4) software provided by the manufacturer and a standardless approach are inadequate for obtaining quantitative results with an accuracy that many geological research questions demand. Tests on international geological reference materials with known compositions showed deviations from accepted values between 0.5 and 22% for major and minor elements. Using the optimized parameter settings, µ-XRF analyses were performed on two different types of color-banded Archaean chert. One was supposedly deposited as a chemical precipitate in a marine-hydrothermal environment. Individual, up to several cm thick layers showed clear compositional contrasts. Red and black layers were iron-rich, while white, pink or orange layers contained abundant silicon. Quantitative analyses, carried out with a 2-mm spot size, yielded ca. 60 wt% SiO2 and 30 wt% Fe2O3 for the dark group of layers, and ca. 88 wt% SiO2 and virtually no iron for the pale group. The measurements showed MnO concentrations up to ~0.15 wt% in the red layers and the existence of a clear stratigraphic trend in Fe/Mn ratios of individual layers. Findings support the hypothesis that hydrothermal activity played a major role in the supply of Si, Fe and Mn. Hence, it is inferred that color-banding reflects changes in the vigor of hydrothermal activity. A second analyzed sample is a color-banded “silicified precursor chert”, which represents a volcaniclastic sediment that became silicified by interaction with silica-saturated seawater. Qualitative µ-XRF results pointed to the presence of quartz, Fe-bearing sericite and some rutile. In this case, color differences were attributable to subtle mineralogical variations, possibly reflecting original changes in sediment supply. This thesis includes a recommended work routine as manual for µ-XRF analysis, meant to serve future users. Advisors/Committee Members: Bergen, M.J. van.

Subjects/Keywords: Geowetenschappen; Micro-XRF, x-ray fluorescence, Archaean cherts

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jansen, S. (2010). X-ray fluorescence microanalysis Instrumental capabilities and application to Archaean cherts. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/179374

Chicago Manual of Style (16^th Edition):

Jansen, S. “X-ray fluorescence microanalysis Instrumental capabilities and application to Archaean cherts.” 2010. Masters Thesis, Universiteit Utrecht. Accessed November 15, 2019. http://dspace.library.uu.nl:8080/handle/1874/179374.

MLA Handbook (7^th Edition):

Jansen, S. “X-ray fluorescence microanalysis Instrumental capabilities and application to Archaean cherts.” 2010. Web. 15 Nov 2019.

Vancouver:

Jansen S. X-ray fluorescence microanalysis Instrumental capabilities and application to Archaean cherts. [Internet] [Masters thesis]. Universiteit Utrecht; 2010. [cited 2019 Nov 15]. Available from: http://dspace.library.uu.nl:8080/handle/1874/179374.

Council of Science Editors:

Jansen S. X-ray fluorescence microanalysis Instrumental capabilities and application to Archaean cherts. [Masters Thesis]. Universiteit Utrecht; 2010. Available from: http://dspace.library.uu.nl:8080/handle/1874/179374

UCLA

30. Fard, Elizabeth. High-resolution geochemical record of Petaluma Marsh from the San Francisco bay area.

Degree: Geography, 2018, UCLA

URL: http://www.escholarship.org/uc/item/5rz186zf

► The San Francisco Bay has the largest concentration of salt marshes in the state of California, representing a diversity of marsh habit. Protecting these environments… (more)

▼ The San Francisco Bay has the largest concentration of salt marshes in the state of California, representing a diversity of marsh habit. Protecting these environments is critical, as salt marshes provide refuge to endangered species, absorb carbon from the atmosphere, and preserve detailed evidence of past climatic, hydrologic, geomorphic, and ecologic conditions. However, much of the marshes have been impacted by pollutants, altered or lost entirely due to human activity over the past 150 years, making their prehistoric conditions, ecological trajectories and resilience to disturbance uncertain. In this study, I collected data from Petaluma Marsh, one of the oldest marshes in the Bay Area, to document the geochemical changes including heavy metal concentrations as a response to climatic and anthropogenic changes since the mid-Holocene. Loss-on ignition, pXRF, and magnetic susceptibility data were collected at high resolution from a 12-meter, 6109-year-old, sedimentary core recovered from this tidal marsh located along the Petaluma river in the northern Bay region. Average rate of sediment accretion is 3.6 mm yr-1 ï¿½ 0.8. Our results show that the introduction of European land-use and activities over the last 150-200 years resulted in disturbance of marsh biota and increases in heavy metals with unprecedented levels of lead and zinc. However, based on statistical time-series analysis of long-core elemental concentrations, results show that modern geochemical conditions are not so far removed compared to prehistoric conditions, as often suggested by century-scale analyses. Modern heavy metal concentrations (e.g., Cr, Fe, Sr, Ba, Zr, Rb and Ni) match concentration levels from 4000-6000 YBP. However, Pb levels in the marsh post-European land use are dramatically higher now than ever before. Our results show the effects of anthropogenic changes on this ancient and ecologically important marsh in the north San Francisco Bay area that can help better inform restoration ecologists and policy makers, specifically in terms of heavy-metal pollutants.

Subjects/Keywords: Geography; Coastal Marshes; Geochemistry; Heavy Metals; Petaluma Marsh; Portable XRF

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fard, E. (2018). High-resolution geochemical record of Petaluma Marsh from the San Francisco bay area. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/5rz186zf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Fard, Elizabeth. “High-resolution geochemical record of Petaluma Marsh from the San Francisco bay area.” 2018. Thesis, UCLA. Accessed November 15, 2019. http://www.escholarship.org/uc/item/5rz186zf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Fard, Elizabeth. “High-resolution geochemical record of Petaluma Marsh from the San Francisco bay area.” 2018. Web. 15 Nov 2019.

Vancouver:

Fard E. High-resolution geochemical record of Petaluma Marsh from the San Francisco bay area. [Internet] [Thesis]. UCLA; 2018. [cited 2019 Nov 15]. Available from: http://www.escholarship.org/uc/item/5rz186zf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Fard E. High-resolution geochemical record of Petaluma Marsh from the San Francisco bay area. [Thesis]. UCLA; 2018. Available from: http://www.escholarship.org/uc/item/5rz186zf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Open Access Theses and Dissertations