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91.
出土、出水饱水木质文物冷冻干燥研究进展 总被引：1，自引：0，他引：1
冷冻干燥是稳定出土、出水饱水木质文物的主要方法之一。该方法基于水由固态直接成为气态的升华过程不产生表面张力的原理,可避免饱水木材脱水时受到干燥应力的破坏。数十年来,经过实验实践和不断完善,冷冻干燥在出土、出水降解木材的稳定中取得了很好的效果,在大型、厚重木质文物的保护方面得到成功应用。本研究基于在出土、出水含盐饱水木质文物保护方面的多年实践,对国内外在脱盐、抗菌、热浸、预冻和升华干燥工艺等方面的进展进行了回顾,并提出了解决一些现有问题的技术设想。 相似文献
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Dan Rabinowitz 《History & Anthropology》2014,25(4):472-487
The mass demonstrations that took place in 2011 in major cities worldwide, dubbed here Contemporary Metropolitan Protest (CMP), varied in terms of the issues tackled and the political efficacy attained, but featured similarities in style, mobilization patterns and the use of traditional and social media. The similarities explain the tendency among commentators and researchers to treat CMP as a coherent category. The variation, on the other hand, raises questions about conceptual and theoretical idioms used so far in the analysis of CMP. The article begins by scrutinizing “resistance”—an idiom introduced to anthropology in the 1980s to theorize peasant response to metropolitan policies—and its recent emergence in the depiction and analysis of CMP. Highlighting the strengths and limitations of the term, I use the rise and fall of CMP in Tel Aviv in 2011 and 2012 as an example of how the implicit logic of aggression and response, so central to earlier employment of the notion of resistance, can be hijacked by defensive regimes that seek to delegitimize and criminalize critique, thus forcing CMP to decline and implode. 相似文献
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Andrea L. Balbo Dan Cabanes Juan José García-Granero Anna Bonet P. Ajithprasad Xavier Terradas 《Environmental Archaeology》2015,20(4):390-405
AbstractThe study of the technology underlying pre-industrial storage structures has an interest from an anthropological and archaeological perspective, in terms of the evolution of key cultural and cognitive capabilities, often related to the transition to food production.Microarchaeological techniques offer a unique perspective on the study of pre-industrial storing technologies. In this work, examples are presented from two archaeological contexts in different climatic and socio-ecological situations during the Holocene in S Asia and SW Europe. Microarchaeological techniques used in this study include micromorphology, Fourier transform infrared spectroscopy and phytolith analyses. The comparative study of two pits highlights key aspects of the decision-making process involved in technological solutions of storage: ? The choice of a location for the construction of a given storage facility is highly affected by contextual climatic, microclimatic, soil and bioturbative factors ? The time taken to consume stored foodstuffs seems to affect technological investment as much as the intrinsic conservation requirements of the stored taxa ? The use of fire to hygienise pits implies that such structures were not conceived for single use ? Pre-industrial storage systems can be seen as modular structures, which components (e.g. topographical location, sediment type, lining type, hygienisation techniques and cover) can be recombined to improve storage performance for different climatic settings and foodstuffs. 相似文献
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The impacts associated with floodplain management adjustments should be understood. This paper addresses this need by describing the perceived and actual impacts floodplain regulations have had on residential land values in a portion of London, Ontario. The institutional arrangements for floodplain regulation and the actual practice of regulation in the City of London for the period 1978–1989 are described. Actual impacts on land values were determined through use of a geographical matching technique based on data obtained from mls sources and permit data available at the Upper Thames River Conservation Authority office. Perceptual data were acquired from a questionnaire survey of floodplain landowners. Findings indicate that most residents perceived that no impact on land values was associated with floodplain regulations. This view was supported by the analysis of actual home transactions 相似文献
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The protection of wetlands through the Ontario Drainage Act has been the subject of much debate. While seen as essential for increasing production and/or productivity of agricultural areas, drainage schemes have been usually approved at the expense of wetlands. Despite the presence of a referral process in Ontario's Drainage Act that is supposed to prevent the significant loss of wetland area, incremental losses continue to occur. The referral process allows landowners, drainage engineers, Drainage Superintendents, local conservation authorities and Ontario Ministry of Natural Resource officials to participate in the decision-making process. This research examines the recommended mitigation measures and wetland gains/losses in Zorra Township between 1978 and 1997. Data sources included drainage files, wetland evaluation files, aerial photography and interviews with government officials. The results indicate that while recommended mitigation measures of drainage schemes in the vicinity of wetlands have increased, incremental losses continue to occur. The negotiated settlements among drainage engineers and the referral agencies appear to be inadequate to maintain the spatial extent of wetlands. The regulatory approach fails to motivate changes in land-use management practices. This supports the need to include nonregulatory incentives in the effort to protect wetlands. 相似文献