The accuracy and time scale invariance of value-at-risk(VaR) measurement methods for different stock indices and at diff......

为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......

Wavelet de-noising has been well known as an important method of signal de-noising.Recently,most of the research efforts......

目的 为提高评估精度并与国际食品安全风险评估技术接轨,构建中国膳食暴露评估非参数概率模型.方法 利用我国膳食调查、污染物监测......