苍南县矴步头谢氏民居壁画颜料初步分析

矴步头谢氏民居始建于晚清咸丰年间,它的整体风貌保存完整,具有较高的历史价值和艺术价值。其中,厢房外壁上的四幅壁画最有特色,但在漫长的环境风化中,壁画本体出现了严重的病害问题,需要有效的保护。为了更好地了解谢氏民居壁画所使用的颜料,该项研究通过剖面观察、拉曼光谱、X射线衍射(XRD)、扫描电镜-能谱(SEM-EDS)等方法对微量的壁画样品进行了分析,证明其绘画时主要使用了羟氯铜矿、铅丹、朱砂、赭石、群青。该项研究为了解壁画的原始画面,及开展后续的保护和利用提供了科学依据。     

Rescaled Range Permutation Entropy: A Method for Quantifying the Dynamical Complexity of Extreme Volatility in Chaotic Time Series

Information entropy,as a quantitative measure of complexity in nonlinear systems,has been widely researched in a variety of contexts.With the development of a nonlinear dynamic,the entropy is faced with severe challenges in dealing with those signals exhibiting extreme volatility.In order to address this problem of weighted permutation entropy,which may result in the inaccurate estimation of extreme volatility,we propose a rescaled range permutation entropy,which selects the ratio of range and s...