To study the seismogeny process or the precursory behavior of the 1976 MS=7.0 Lijiang earthquake, we analyze the repeat gravity data with high precision from the Western Yunnan Earthquake Prediction Experiment Area (W...To study the seismogeny process or the precursory behavior of the 1976 MS=7.0 Lijiang earthquake, we analyze the repeat gravity data with high precision from the Western Yunnan Earthquake Prediction Experiment Area (WYEPEA) and the related results of geology and geophysics survey in this paper. Considering the gross errors caused by observation data and model difference, we have firstly inverted the slip distribution of the main active faults with time based on the robust Bayesian least squares estimation and multi-fault dislocation model. The re-sults show that the slip changes of the faults with time from 1990 to 1997 obviously reflect the preparation process of the Lijiang earthquake. The images of main precursor mode have the characteristic of main shock-after shock type, which is agreement to the model of coupling movement between crust density and crust deformation (DD mode of coupling movement).展开更多
目的建立一种超高效液相色谱-三重四极杆/复合线性离子阱质谱(ultra performance liquid chromatography-triple quadrupole linear/ion trap of mass spectrometry,UPLC-Qtrap-MS/MS)检测方法,用于保健食品中西地那非类衍生物的快速筛...目的建立一种超高效液相色谱-三重四极杆/复合线性离子阱质谱(ultra performance liquid chromatography-triple quadrupole linear/ion trap of mass spectrometry,UPLC-Qtrap-MS/MS)检测方法,用于保健食品中西地那非类衍生物的快速筛查和鉴定。方法样品经甲醇提取,经甲醇-水(50:50,V:V)适当稀释,采用0.1%甲酸水(A)和0.1%甲酸乙腈(B)作为流动相进行洗脱,质谱(ESI+)采用母离子扫描模式(precursor ion)对西地那非类似物进行检测,利用一级、二级、三级质谱碎片进行结构解析。结果通过该方法成功发现了一种新型的西地那非类衍生物。结论该方法快速、准确、灵敏,可用于保健食品中西地那非类衍生物的筛查。展开更多
基金Joint Seismological Science Foundation of China (101005) and the State Key Basic Research Project (G1998040703).
文摘To study the seismogeny process or the precursory behavior of the 1976 MS=7.0 Lijiang earthquake, we analyze the repeat gravity data with high precision from the Western Yunnan Earthquake Prediction Experiment Area (WYEPEA) and the related results of geology and geophysics survey in this paper. Considering the gross errors caused by observation data and model difference, we have firstly inverted the slip distribution of the main active faults with time based on the robust Bayesian least squares estimation and multi-fault dislocation model. The re-sults show that the slip changes of the faults with time from 1990 to 1997 obviously reflect the preparation process of the Lijiang earthquake. The images of main precursor mode have the characteristic of main shock-after shock type, which is agreement to the model of coupling movement between crust density and crust deformation (DD mode of coupling movement).
