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Beatriz Prieto Perla Ferrer Patricia Sanmartín Victor Cárdenes Benita Silva 《Journal of Cultural Heritage》2011,12(4):420
Substitution of slate roofing tiles is a conventional operation during building restoration, since tiles are very difficult to restore or clean because of the high degree of alteration they suffer. Criteria for replacement of historical building stones must be based on geological, geotechnical and esthetic parameters, among which color is of great importance. In this sense, this paper constitutes a comprehensive and useful colorimetric study of roofing slates from the Iberian Peninsula, for the purposes of restoration. The color of 50 commercial varieties of roofing slate mined in quarries from the 12 mining districts in the Iberian Peninsula was analyzed with a spectrophotometer device, by considering the CIELAB color space. The results of the study were used to develop a protocol for characterizing the color of roofing slate and to define the color range of roofing slate from the Iberian Peninsula. In addition, the similarities and differences in the color and microstructure of the different commercial varieties of Iberian roofing slate were established and the limit of acceptability of replacement of one type of slate by another was determined. Parameter hab was found to be the most important CIELAB color coordinate as regards the formation of homogeneous color groups, and the specular component excluded (SCE) mode was most sensitive as regards detecting color differences between two samples. 相似文献
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明代读书石板深浮雕记载了书院授课的情景,反映了这一时期人人乐学上进、尊师重教的社会风貌,启示后人在盛世之年、多梦时代要多读书、勤读书。 相似文献
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陈春君 《衡阳师范学院学报》2014,(4):85-88
陶寺陶板边缘均整齐平直,没有瓦沟疏导雨水,不可能作为板瓦使用;陶板的厚度多在1~2厘米之间,厚度不能满足地板砖承重的需要,不能作为地板砖使用。陶板所在出土单位出土了烟囱、陶水管、灶块等厨房建材,因此陶板可能是厨房用砖。 相似文献
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The toxicity of asbestos has been constantly an active research topic. Although asbestos has lots of advantages owing to its stable physicochemical properties and economic characteristics, nations enforce policies prohibiting or limiting its use because of its critical impact on human health. Especially in Korea 96% of imported asbestos are slate construction materials and with the influence of Saemaul movement, thatched roofs have been drastically replaced with slate roofs. Efforts to know the distribution characteristics of extensively used asbestos cement slates and to find out the removal method that suits the distribution characteristics are still in an insufficient state. The purpose of this work was to probe into the distribution of asbestos cement slate buildings in Korea and provide basic data of distribution characteristics for policy making in which consideration of the differences between rural and urban regions is necessary based on findings of the studies so far. It is considered helpful in many ways to solving asbestos cement slate related problems in countries where asbestos usage is increasing even after the 2000s including China. 相似文献
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传统国有产权的配置形式必须彻底改革,但改革的根本出路并不在于"人格化"还是"非人格化",而是取决于我们是否能将以往的"社会实际占有"转变为"劳动人民实际占有",即通过"劳动人民实际占有"的新途径去实现"社会所有"."非人格化"的联合产权主体行使终极控制权,并不能使国有资本的保值和增值的最大化成为必然."非人格化"改革思路需要解决的三个基本前提,只能是一种良好的夙愿."非人格化"产权实现形式的两大推进条件,更让人对国有产权"非人格化"改革归宿感到忧惧. 相似文献
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文章结合工程实际情况,介绍了住宅小区屋面工程的监理方法和控制措施,通过对屋面工程施工各个环节的监控,确保了屋面防水层的施工质量。 相似文献
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屋面是建筑物最上层的外围护构件,用于抵抗自然界的雨雪、风、霜、太阳辐射、气温变化等不利因素的影响,保证建筑内部有一个良好的使用环境。据调查研究,我国屋面存在不同程度渗漏的占抽查总数的35%。造成渗漏的原因大概可以分为与技术有关的原因(如设计、施工)、非技术原因(如维护管理)。文章通过两个工程实例分析了非技术原因造成屋面渗漏水的原因。 相似文献
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本研究运用单一被试实验法、观察法和测试法 ,对宁波盲校小学部 1 996级1 0名学生点字书写的 4年研究发现 :盲童使用点字板 (笔 )和使用盲文打字机的书写效果不同 ,使用盲文打机比使用点字板 /笔书写速度快 2倍 ,使用盲文打字机书写效率较高 ;盲童使用不同规格点字板、点字笔和纸张对点字书写速度有一定影响。 相似文献
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