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中药材山柰的X衍射Fourier图分析 被引量:34
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作者 吕扬 郑启泰 +1 位作者 章菽 陈毓亨 《药学学报》 CAS CSCD 北大核心 1998年第8期587-590,共4页
每种中药材中均含有数十种乃至上百种成分,是一个多组分系统。X衍射将提供一种既能反映中药材整体固有结构特征,又能表现来自其局部成分变化的图谱化与数值化的方法。它将在衍射空间中实现中药材的鉴定。考虑到中药材的品种、产地、... 每种中药材中均含有数十种乃至上百种成分,是一个多组分系统。X衍射将提供一种既能反映中药材整体固有结构特征,又能表现来自其局部成分变化的图谱化与数值化的方法。它将在衍射空间中实现中药材的鉴定。考虑到中药材的品种、产地、生长年限、采集季节等物候因素的影响,本研究选择了不同产地和采集时间的植物药山柰与苦山柰的6个样品进行X衍射Fourier图分析。获得了可用于山柰与苦山柰鉴别的特征标记峰与衍射模糊图形。研究结果表明,X衍射Fourier图分析法尚可用于性状与组织结构相似。 展开更多
关键词 山柰 苦山柰 X衍射 中经鉴定
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陕西医史博物馆医史文物研究概况
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《现代中医药》 CAS 2007年第6期F0002-F0002,共1页
关键词 陕西医史博物馆 医史文物 医药卫生期刊 医学专科 医药卫生类 中经鉴定 医方碑
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Chinese Business Cycles Identified by Coincident Indexes
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作者 汪红驹 张慧莲 《China Economist》 2014年第1期110-124,共15页
In reference to the method of the Conference Board,the coincident indexes for China are constructed from a sample period between January 1990 and May 2012 and by51 chosen component indicators.The resulting coincident ... In reference to the method of the Conference Board,the coincident indexes for China are constructed from a sample period between January 1990 and May 2012 and by51 chosen component indicators.The resulting coincident indexes have higher correlations with gross domestic product(GDP) growth rates than the China Economic Monitoring and Analysis Center(CEMAC) coincident index over the sample period between February2005 and May 2012.The peaks and troughs of the growth rates in several indicators are identified.The total number of peaks and troughs in the resulting coincident index is the same with the CEMAC coincident index.Unfortunately,these troughs don't signify recessions in the Chinese economy because the financial system has not seen a negative growth rate over the specific sample periods.The impacts of the Southeast Asian Financial Crisis and subprime mortgage crisis on the business cycle could be dated via a smoother index from HP filtering to the coincident index. 展开更多
关键词 coincident index business cycle Bry-Boschan algorithm
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