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玉米秸秆油污吸附剂的制备及其在油水分离中的应用 被引量:5
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作者 石彦龙 冯晓娟 +1 位作者 王永生 岳国仁 《科学通报》 EI CAS CSCD 北大核心 2019年第1期87-94,共8页
以玉米秸秆为原料,粉碎后浸涂ZnO溶胶并经辛基三甲氧基硅烷(OTS)修饰后呈超疏水性和超亲油性,水滴在其表面的接触角为158.6°,滚动角小于5°,而油滴在其表面则完全铺开.利用玉米秸秆粉表面的超疏水性和超亲油性,可将其用于水面... 以玉米秸秆为原料,粉碎后浸涂ZnO溶胶并经辛基三甲氧基硅烷(OTS)修饰后呈超疏水性和超亲油性,水滴在其表面的接触角为158.6°,滚动角小于5°,而油滴在其表面则完全铺开.利用玉米秸秆粉表面的超疏水性和超亲油性,可将其用于水面油污的过滤、吸附、分离及循环利用,其对油水混合物中油、水的分离效率分别为98.0%和99.6%.相关研究有望为玉米秸秆的加工、利用及油污吸附剂的制备提供新的思路. 展开更多
关键词 玉米秸秆 ZnO溶胶 超疏水 超亲油 油水分离
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Can Technical Indicators Provide Information for Future Volatility:International Evidence
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作者 Yafeng shi Xiangxing TAO +3 位作者 yanlong shi Nenghui ZHU Tingting YING Xun PENG 《Journal of Systems Science and Information》 CSCD 2020年第1期53-66,共14页
We employ the static and dynamic copula models to investigate whether technical indicators provide information on volatility in the next trading day,where the volatility is measured by daily realized volatility.Our em... We employ the static and dynamic copula models to investigate whether technical indicators provide information on volatility in the next trading day,where the volatility is measured by daily realized volatility.Our empirical results,based on long samples of 8 well-known stock indexes,suggest that a significant and asymmetric tail dependence between the technical indicators based on moving average and the next day volatility.The level of dependence change over time in a persistent manner.And the dependence structure presents some distinct differences between emerging market indexes and developed market indexes.These results indicate that the technical indicators can provide information on the next day volatility at extremes,and are less informative at normal market. 展开更多
关键词 VOLATILITY technical INDICATOR TAIL DEPENDENCE COPULA high frequency data
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