Twenty‐year weathering remeasurements at St Paul's Cathedral,London

Microerosion meter (MEM) measurements of the surface height of the balustrade of St Paul's Cathedral, London, have been repeated in the year 2000 following earlier measurements in 1980, 1981, 1985 and 1990. Methodological sources of error mean that while the measurements were made to 0·0001 mm, the data are reliable to two decimal places. There was a reduction in the mean erosion rate on horizontal sites from 0·045 mm a^?1 in the period 1980–1990 to 0·025 mm a^?1 in 1990–2000. Decreases in atmospheric SO₂ levels from 20–25 ppb in 1980–1982 to around 10 ppb in 1990–2000, offer a causal explanation. The surface topography evolved more erratically in 1990–2000 than before, with much, but not all, of the more microelevated areas showing greater, and often more variable erosion. There are also indications of less erosion and more surface rises in low‐lying microareas on horizontal sites which is interpreted as possible deposition and/or microfloral growth in wetter depressions, the pattern being largely absent on a well drained vertical site. Copyright © 2001 John Wiley & Sons, Ltd.     

淮南八公山石芽地貌景观考察

通过对淮南八公山石芽地貌景观的考察，初步掌握该景观旅游地质基本状况，认为可作为旅游资源，进一步做地质调查。并向有关部门提出开发建议。     

石质文物风化病害防治的环境地质问题

石质文物的风化病害防治必须重视对地质环境的研究 ,地质环境的研究是彻底根治风化病害的前提。论述了风化病害的类型和机理 ,讨论了影响风化的主要环境因素和环境地质问题 ,提出了风化病害防治的原则与对策。     

Errors in measuring the percentage dry weight change of stone tablets

Portland Stone and Monks Park limestone tablets were used to assess weathering loss over a two-year study. Procedures involved in preparing tablets for exposure, attaching them to the exposure frame and reweighing might have influenced weight changes measured. The impact of each stage in the above procedures was tested to assess how much weight loss was generated and how significant the loss was comparing the two stone types and the final loss sustained upon weathering. Although all the procedures seem to produce a statistically insignificant amount of weight loss, the two stone types do respond differently to the procedures. This suggests that stone properties may be important in determining the accuracy with which tablets can be used to assess spatial patterns of weathering.     

麦饭石评价中的若干问题探讨

本文分析了麦饭石评价中存在的若干问题，并讨论这些问题进行了研究和探讨。     

湖南宝,玉石资源及其开发浅议

湖南出产宝石历史悠久，长期以来远销海内外，菊花石工艺享誉全球，曾多次在国际博览会上获奖。还有较丰富的海蓝宝石、祖母绿、水晶等十几种宝石、玉石、彩石资源。其地质成因类型主要有砂矿型、沉积型、伟昌岩型、火山岩型，气成－热液型、沉积变质和接触变质型。     

黄金珠宝首饰市场状况与四川宝石资源开发

介绍了黄金珠宝首饰的一些基本观念和近年来黄金珠宝市场的发展状况，指出１９９４年纯金饰品消费将会稳定增长，而且仍占主流，珠宝首饰市场会出现消费量增长，竞争日渐激烈，并由大中城市向中小城市扩展的趋势。就四川宝玉石普查找矿和开发利用提出了见解。     

The decay of coastal forts in southeast Brazil and its implications for the conservation of colonial built heritage

The 500th anniversary of European arrival in Brazil was celebrated in 2000 and highlighted the need to review the condition of the countrys remaining colonial built heritage. This revision is particularly apposite in the adjacent cities of Rio de Janeiro and Niterói, where the heritage that survived twentieth century reconstruction has done so largely because of ownership by the church or military. However, whilst this may have protected buildings from demolition, detailed fabric can be neglected or abused. This paper investigates this possibility through an examination of two forts, built primarily of local augen gneiss, that guard the entrance to Guanabara Bay. Natural outcrops exposed to the same humid sub-tropical maritime environment show that this rock is susceptible to slow disaggregation through salt weathering. Surveys suggest that stonework in the forts that is sheltered from rainwash is heavily loaded with salt and has passed a threshold, wherein stresses accumulated over centuries of apparent stability, combined with the effects of a more recent increase in atmospheric pollution and apparently inappropriate intervention (re-pointing), have triggered rapid breakdown that requires immediate intervention.     

石粉灌浆石砌体的抗震抗剪强度及其应用研究

基于灌浆石砌墙体的拟动力试验、工程实践和震害经验，经分析研究，首次提出灌浆石砌体的抗震抗剪强度及抗震加固验算方法。经对工程实例验算，验证了本研究的可靠性和实用性。