排序方式: 共有76条查询结果,搜索用时 0 毫秒
1.
2.
仿生合成石质文物二氧化硅保护膜的研究 总被引:2,自引:0,他引:2
由于二氧化硅仿生材料具有优越的耐候性,与基底石材相容性好,合成条件的温和性及对环境无污染等优点,为此制备了二氧化硅防护膜。室温下利用CTAB自组装体为模板来调控Na2SiF6水解,在石材表面制备出具有优良性能的SiO2膜,并对膜进行了XRD、SEM分析表征。经过保护处理的石材表面清洁、透明,具有突出的抵抗酸碱性能。生成的保护膜具有良好的透气性,而吸水性有所下降。另外,该保护膜还显示出优良的抵抗高、低温,耐磨,及与基底结合紧密等性能。上述研究表明,仿生SiO2膜将会对石质文物起到更好的保护作用。 相似文献
3.
丝绸之路是古代东西方交流的重要商路,甘肃是连接丝绸之路东西段的重要通道,但是与唐代以后丝绸之路的衰落不同的是,甘肃境内的丝绸之路并没有随之消亡,反而在漫长的历史长河中因为各种因素的叠加和选择成为甘肃道路交通的骨架。民国时期,随着现代交通技术的传入,公路为主的道路交通建设得到了发展,民国政府修建了大量的公路,而这一时期道路交通的建设又与丝绸之路故道有着密不可分的关系,并形成了以丝绸之路故道为依托的道路交通系统。 相似文献
4.
5.
6.
Marcos Martinón-Torres Xiuzhen Janice Li Andrew Bevan Yin Xia Kun Zhao Thilo Rehren 《Journal of Archaeological Method and Theory》2014,21(3):534-562
This paper explores the integration of chemical data with metric studies and spatial analyses of archaeological artifacts to investigate questions of specialization, standardization, and production organization behind large-scale technological enterprises. The main analytical focus is placed on the 40,000 bronze arrowheads recovered with the Terracotta Army in the First Emperor’s Mausoleum, Xi’an, China. Based on the identification by portable X-ray fluorescence spectrometry of chemical clusters that correspond to individual metal batches, and combined with a study of their context in the tomb complex, we argue that the manufacture of arrows was organized via a cellular production model with various multi-skilled units rather than as a single production line. This system favored more adaptable and efficient logistical organization that facilitated dynamic cross-craft interaction while maintaining remarkable degrees of standardization. We discuss the use of “the batch” as an analytical category and how our method might be applied to other studies of craft organization in complex societies and imperial systems. 相似文献
7.
我国峡谷生态旅游开发模式与战略初探 总被引:7,自引:1,他引:7
峡谷是一种独特的自然旅游资源,我国峡谷资源数量丰、类型多、分布广,生态旅游开发潜力巨大。目前国内峡谷生态旅游正处于起步阶段,相关研究较为欠缺。本文试图以参加规划和研讨的峡谷景区为切入点,初步探讨我国峡谷景区生态旅游的开发模式与开发战略,以推动我国峡谷生态旅游发展。 相似文献
8.
国内外服务业地理研究进展 总被引:1,自引:0,他引:1
服务业地理学是以服务业活动的地域系统为核心、探索服务业空间活动规律的一门学科,它是经济地理学的重要分支。围绕服务业地理学研究对象对相关文献进行梳理,文章认为:目前服务业地理学尚未形成一套完善的理论体系和研究框架,在理论上需要吸收服务业经济学、地理学及社会学等多学科的理论来丰富和完善;在研究方法上应加强质性研究和定量分析的结合;在研究内容上应深化服务业与区域经济可持续发展、信息技术影响下的服务业区位选择、服务业微区位、服务业贸易对区域产业结构及产业空间组织的影响、服务业地域综合体等议题的研究。 相似文献
9.
10.
The measurement and interpretation of spatial economic structure have presented many problems for analysts. The notion of a spatial multiplier has received even less formal attention; part of the motivation for this paper is the examination of the degree to which sectoral decomposition analysis might prove useful in illuminating the paths of interaction across space that are associated with changes in exogenous activity levels. In this paper, we present three perspectives that examine spatial structure in the context of an aggregated interregional social accounting matrix for Bangladesh. These perspectives examine structure at the micro-, meso-, and macrolevels and are interpreted with the assistance of several alternative methods, including structural path analysis, the field of influence, the superposition principle, multiregional feedback loop analysis, and the Matrioshka Principle; the results are interpreted analytically and cartographically. Some attention is also devoted to the formulation of a general approach to spatial multipliers. It is shown that the structure of flows and the structure of influence reveal patterns that, taken together, provide important insights into an understanding of structure and may prove to form the basis for the eventual formal presentation of the spatial multiplier. 相似文献