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【文化中国行】琢石续千秋凝灰岩文保破解世界难题_我的网站

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一 | 央视新闻客户端消息（新闻联播）：石质文物以碑刻、造像等留存文字与历史，是记述中华文脉的载体。8月16日的《文化中国行》，我们走进世界遗产地承德避暑山庄，昔日热河行宫、御苑胜景里淬炼出的文保智慧，正为世界石质文物保护提供新经验。 LONDON -- Former Formula One boss Bernie Ecclestone admitted fraud at a court hearing Thursday after prosecutors charged him with failing to declare millions of dollars held in a trust in Singapore to Britain’s government.The 92-year-old billionaire, who wore a dark suit, said “I plead guilty” at Southwark Crown Court in central London. Ecclestone headed Formula One racing and controlled the sport for for four decades from the 1970s to 2017, when he stepped down as chief executive and Liberty Media took over the series.Prosecutors allege he failed to declare a trust in Singapore with a bank account containing around $650 million when he was asked about any trusts abroad that he was involved in.They say that Ecclestone claimed he had set up “only a single trust” in favor of his three daughters, and that he was “not the settler nor beneficiary of any trust in or outside the U.K.” Prosecutors say he acted “dishonestly” and intended to make a gain from the claims.“He now accepts that some tax is due in relation to these matters," prosecutor Richard Wright said.Ecclestone had pleaded not guilty to the charges earlier this year.。承德避暑山庄及周围寺庙是中国现存最大的古典皇家园林，其中的石雕石刻是中国营造技艺的结晶。这些凝灰岩石质文物，由于在室外经历三百多年寒暑交替、风化冻融，就像“千层酥”一样，呈现出网状、线状等裂隙交错。而此前，在世界范围内对凝灰岩类石质文物的保护，都鲜有成功先例。面对这道世界级文物修复难题，中国文化遗产研究院自2011年起持续攻坚，在对上万块凝灰岩试样的上千次冻融循环试验的同时，也找到了修复材料的新发现。在仰韶文化时期，秦安大地湾先民曾用来盖房的古建材料“料礓石”，其中的碳酸钙在改变材料物理性能后，既能保证石头自由“呼吸”，又能有较好的修复效果。科研团队备受启发，将材料范围进一步拓展到螺、蚝、贝等，通过研究碳酸钙与其他成分的配比，进而得到比水泥、混凝土更牢固、更透气的天然修复材料。补石头缝隙，可谓沟壑千万，最难的是那些毫米级甚至更小的裂缝。