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41.
G. Huelga‐Suarez M. Moldovan M. Suárez Fernández M. Ángel de Blas Cortina J. I. García Alonso 《Archaeometry》2014,56(4):651-664
This paper continues the characterization of the lead isotopic fingerprint of ancient copper mines in the north‐west of Spain. In this work, the lead isotopic compositions found in copper ores from the La Profunda mine are presented. Azurites and malachites sampled from this deposit were subjected to lead isotope analysis by multicollector ICP–MS. The results showed a clear radiogenic lead signature compatible with the presence of uranium‐rich minerals (such as zeunerite) in the same mining complex. Moreover, a rare copper artefact, found in the galleries of the mine during its modern exploitation, was also analysed and showed that local mineral was used for its manufacturing. 相似文献
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浑仪、简仪(以下简称两仪)在高PH、大气污染和日晒雨淋环境中的腐蚀是一种动态加速腐蚀过程。采用合成的双唑胺铜缓蚀剂和有机硅改性的甲基丙烯酸树脂,并分别复配成协同缓蚀剂群和含有增效稳定剂的封护剂。采用这两种材料和脱水后再防护的工艺,使带锈防护后的浑仪、简仪的腐蚀低于无污染大气中的速率。用电化学方法评价了防护技术的可行性,根据腐蚀与人工老化试验结果讨论了防护材料性能与腐蚀环境和带锈防护的关系,采用XPS分析方法探索了双唑胺比BTA更适用于两仪防护的原因。 相似文献
43.
选取土默特平原1934、1982和2019年的聚落人口数据,运用GIS空间分析法,定性与定量结合分析研究区聚落分布形态演变及其驱动因素,结果表明,1934—2019年土默特平原以小聚落为主,大规模聚落数量和比例逐年增加,人口等级结构由“扁平”向“长高”金字塔形转变。聚落空间分布整体呈现集聚分布特征,大规模聚落集聚性不显著,其他规模的聚落分布模式由随机向集聚转变,研究区人口极化现象显著;聚落空间分布非均衡发展趋势明显,呈现由极核式向点轴式演变的迹象;聚落网络联系的空间近邻效应显著,人口规模较大的中心城区成为强联系节点。地形、河流、交通是研究区聚落分布形态演变的主要驱动因素,聚落低海拔、邻河流、邻干道、邻城镇的指向性强。该研究便于厘清土默特平原近百年聚落分布形态的演变脉络,为当地聚落的空间布局优化与调控提供一定参考价值。 相似文献
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博物馆藏书结构与博物馆业务研究密切相关。本文分析了河南博物院图书室的性质、作用和藏书结构与业务研究的关系,提出了如何解决现有矛盾的对策。 相似文献
48.
Although creative industries have been popular as a research topic among social scientists from various backgrounds, most studies lack an explicit evolutionary, history‐informed perspective. In this paper, we critically explore whether the notions of evolutionary economic geography can contribute to analyzing and explaining the spatial dynamics of creative industries, which has not been done yet in a systematic way. Although not all evolutionary concepts are useful, we conclude that co‐evolution in particular has important potential in helping to explain the spatial dynamics of creative industries in a comparative perspective. 相似文献
49.
Wendy Su 《International Journal of Cultural Policy》2013,19(5):513-528
This paper seeks to explore the internal driving forces behind the emergence and prosperity of China’s cultural industries. The paper traces the Chinese Communist Party’s radical transformation from stressing the class stand and ideological nature of culture to concluding with the concept of ‘cultural industries’ so as to expand an orthodox Marxist/Leninist/Maoist notion of culture. The Chinese party-state legalizes ‘cultural industries’ by extending the market mechanism into the cultural arena, and acknowledges the triple statuses of culture as a public service provider, a market profit contributor, and an essential builder of the ‘socialist core value system.’ By doing so, the Chinese Party-state is able to take advantage of the economic power of the market while retaining the ideological control function of culture. As such, cultural industries become a mode of governance for the CCP to maintain cultural security and national identity, and a source of soft power to maneuver. 相似文献
50.
ABSTRACT This paper provides theoretical and empirical analyses of the effect of transportation subsidies on urban sprawl in a two‐mode urban spatial model. Comparative static analysis shows, among other things, that the urban area contracts with a public transit subsidy but expands with an auto subsidy. The paper provides the first empirical test of these hypotheses and finds that the spatial size of the urbanized area shrinks with an increase in transit subsidies but increases at a decreasing rate with auto subsidies. 相似文献