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Colour measurements and non‐destructive μ‐X‐ray mappings have been used for the first time in a comprehensive study of medieval émail champlevé works from different production areas in France and Germany. This approach has given a new insight into the enamel powder preparation process of the glass material used for enamelling. Colour measurements demonstrated that all production centres used glass of very similar hues, but with large differences in colour saturation. The μ‐X‐ray mapping results of blue enamels are described by a semi‐qualitative approach. Significant variations in oxide contents of lead, cobalt, manganese and antimony oxides were found. The variations suggest that more than one glass material was used to prepare the powder for enamelling. The variations in antimony and cobalt show that glass had different degrees of opacity and colour depth. The manganese and lead contents, which do not correlate with the cobalt or antimony contents, indicate that probably glass of different base compositions was used to prepare the enamel powder for one champlevé field. 相似文献
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A group of Roman glass objects from the Bocholtz burial in the SW of Limburg (The Netherlands) was found to have been subject to varying degrees of degradation. Many of the 25 colourless glass objects were fragmented to pieces <0.1 cm (“sugared”), whereas the three transparent blue-green glass objects were in near-pristine state. Analyses using SEM, XRF and EDS revealed that the fragmentation was the direct result of the intense leaching of Na2O from the glass structure and its replacement with water. The resulting gel layers with low-Na2O contents and large amounts of water are sensitive to cracking when they dry out. Thin-walled glass appears to be less sensitive to cracking from the resulting stress than thick-walled glass. Local differences in the moisture regime during burial also influence the severity of the glass degradation. Glass with low concentrations of CaO seems to be the most sensitive to this form of degradation. The typical blue-green Roman glass is less sensitive as it generally has considerably higher concentrations of CaO. 相似文献
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《Journal of Geography in Higher Education》2012,36(1):91-99
This paper examines the experiences of women of colour in geography. An analysis of qualitative, open‐ended questionnaires with women of colour geography faculty and graduate students in North America and Britain suggests that policies and practices within geography departments continue to reflect a pervasive persistence of racialized and gendered inequities in the workplace. There has been relatively little application of theoretical work on race and gender to the minority experience within geography. Some strategies suggested to challenge racialized and gendered barriers that limit women of colour's full participation in geography include a proactive recruitment programme, diversification of the curriculum and development of mentoring. 相似文献
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Wendy Meulebroeck Peter Cosyns Kitty Baert Hilde Wouters Simone Cagno Koen Janssens Herman Terryn Karin Nys Hugo Thienpont 《Journal of archaeological science》2011
Archaeometric research on glass artefacts is continuously evolving and is converging towards a multidisciplinary research domain where different types of techniques are applied depending on the questions asked and the circumstances involved. The technique described in this work is optical spectroscopy. The benefit of this technique being the possibility of building up a knowledge database for a large amount of material in a relatively short period of time and with a relatively limited budget. This is of particular interest for the investigation of extensive and/or unexplored glass collections where a first-line analysis of artefacts could facilitate the selection of material needing further and more detailed examination. 相似文献
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Karen Severud Cook 《Imago Mundi: The International Journal for the History of Cartography》2013,65(1):155-156
Abstract Geological information was first printed in colour on a map in 1820 but serious efforts to print geological maps in multiple colours began in Europe only in the 1840s. Increased geological mapping activity created the need to print more maps by cheaper methods, while general advances in lithographic colour printing provided the means. Better colour registration, transparency, range, permanence and distinctiveness were attained in the 1840s and 1850s by technical innovations and also by new design strategies. Consequently, as printed colour replaced hand colour as the norm, it also influenced the look of the geological map. 相似文献
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Experimental Heating of Moravian Cherts and its Implication for Palaeolithic Chipped Stone Assemblages 下载免费PDF全文
The applicability of colour, magnetic susceptibility and remanent magnetization measurements for the identification of heated or accidentally burned Palaeolithic cherts from Moravia (Czech Republic) is tested in this study. We conclude that all these methods are usable. Colour changes are best detectable in materials heated at between 250–350°C, while magnetic susceptibility and remanent magnetization change at higher temperatures, closer to 600°C. This latter temperature, however, is usually destructive for cherts and is probably evidenced by accidentally burned artefacts. With the use of the three methods, we managed to identify three probably heated chert artefacts from two early Upper Palaeolithic assemblages from Moravia. 相似文献
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Neil A. Dodgson 《Interdisciplinary science reviews : ISR》2016,41(4):281-296
Anish Kapoor has become well known for his enormous architectural installations and for his use of vibrant colour. Much of his work depends critically on good engineering and he has collaborated closely with engineers for many years. I discuss several of Kapoor's large works, approaching them from an engineer's perspective. I also show how Kapoor weaves layers of narrative in some of his work: so that a naïve understanding of a piece's construction is a falsehood layered over the true engineering solution. The story seems initially obvious to the audience but a little digging, a little thought, reveals that it is a fiction and that reality is something other. 相似文献
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