Small earthquake data from the Pishan MS6.5 aftershocks is collected by the Xinjiang Regional Digital Seismic Observation Network.Five parameters of the focal region are obtained by micro genetic inversion:stress dro...Small earthquake data from the Pishan MS6.5 aftershocks is collected by the Xinjiang Regional Digital Seismic Observation Network.Five parameters of the focal region are obtained by micro genetic inversion:stress dropΔσof 75.95 bars,quality factor parameters Q0of 186.33 andηof 0.26,geometric attenuation parameters R1of 72.18km and R2of 139.70km.We calculate the Fourier spectrum and combine it with the random phase spectrum to get the ground motion time history,and build the strong motion acceleration attenuation relationship.The strong ground motion acceleration attenuation of the Pishan area is thus obtained.Because of the insufficiency of strong ground motion records,we added the records from the Wuqia MS6.9 earthquake on October 5,2008,the Akto MS6.2 earthquake on October 6,2008,and the Lop MS6.0 earthquake on March 9,2012 to the data.The comparison of the calculation results and the empirical attenuation relationships with strong ground motion records reveal that the strong motion data of Pishan and Lop earthquakes is higher than the empirical attenuation relationships.The Wuqia MS6.9 earthquake strong motion data is consistent with Yu Yanxiangs(2013)short axis result,and lower than the present result.展开更多
为探明非浓缩还原(not from concentrate,NFC)梨汁品质指标间的相互关系、构建NFC梨汁综合评价体系,以32个品种梨果实为材料,利用描述性统计、相关性分析、因子分析、回归分析对其鲜榨汁的12个品质指标进行统计分析,采用K-means聚类分...为探明非浓缩还原(not from concentrate,NFC)梨汁品质指标间的相互关系、构建NFC梨汁综合评价体系,以32个品种梨果实为材料,利用描述性统计、相关性分析、因子分析、回归分析对其鲜榨汁的12个品质指标进行统计分析,采用K-means聚类分析和判别分析法建立NFC梨汁品质判别函数。结果表明,NFC梨汁品质指标间离散程度差异很大,变异系数在5.46%~105.73%之间,其中,类黄酮变异系数最大,达到105.73%;而亮度(L值)变异系数最小,为5.46%。转化后的数据经因子分析共提取出4个公因子,分别为功能因子(方差贡献率为27.873%)、风味因子(方差贡献率为24.890%)、外观因子(方差贡献率为17.364%)、甜度因子(方差贡献率为14.235%),累计方差贡献率为84.362%。通过回归分析筛选出酚类物质质量浓度、糖酸比、色度角(h值)、可溶性糖质量浓度、L值、类黄酮质量浓度6项指标为NFC梨汁品质评价核心指标,由此建立了NFC梨汁品质等级判别函数,建模样本判别正确率为100%,可用于NFC梨汁综合品质定性的判别。展开更多
基金jointly sponsored by “The Ground Motion Attenuation Relationship Based on Seismology and Its Practicability” of the National Natural Science Foundation of China(51178434)“With Digital Ride Network Small Earthquake Records to Establish Regional Strong Ground Motion Attenuation Relations”from the National Natural Science Foundation of China(51478443)“Based on the Regional Parameters of Mixed Ground Motion Attenuation Relationship”from the National Natural Science Foundation of China(51678540)
文摘Small earthquake data from the Pishan MS6.5 aftershocks is collected by the Xinjiang Regional Digital Seismic Observation Network.Five parameters of the focal region are obtained by micro genetic inversion:stress dropΔσof 75.95 bars,quality factor parameters Q0of 186.33 andηof 0.26,geometric attenuation parameters R1of 72.18km and R2of 139.70km.We calculate the Fourier spectrum and combine it with the random phase spectrum to get the ground motion time history,and build the strong motion acceleration attenuation relationship.The strong ground motion acceleration attenuation of the Pishan area is thus obtained.Because of the insufficiency of strong ground motion records,we added the records from the Wuqia MS6.9 earthquake on October 5,2008,the Akto MS6.2 earthquake on October 6,2008,and the Lop MS6.0 earthquake on March 9,2012 to the data.The comparison of the calculation results and the empirical attenuation relationships with strong ground motion records reveal that the strong motion data of Pishan and Lop earthquakes is higher than the empirical attenuation relationships.The Wuqia MS6.9 earthquake strong motion data is consistent with Yu Yanxiangs(2013)short axis result,and lower than the present result.
文摘为探明非浓缩还原(not from concentrate,NFC)梨汁品质指标间的相互关系、构建NFC梨汁综合评价体系,以32个品种梨果实为材料,利用描述性统计、相关性分析、因子分析、回归分析对其鲜榨汁的12个品质指标进行统计分析,采用K-means聚类分析和判别分析法建立NFC梨汁品质判别函数。结果表明,NFC梨汁品质指标间离散程度差异很大,变异系数在5.46%~105.73%之间,其中,类黄酮变异系数最大,达到105.73%;而亮度(L值)变异系数最小,为5.46%。转化后的数据经因子分析共提取出4个公因子,分别为功能因子(方差贡献率为27.873%)、风味因子(方差贡献率为24.890%)、外观因子(方差贡献率为17.364%)、甜度因子(方差贡献率为14.235%),累计方差贡献率为84.362%。通过回归分析筛选出酚类物质质量浓度、糖酸比、色度角(h值)、可溶性糖质量浓度、L值、类黄酮质量浓度6项指标为NFC梨汁品质评价核心指标,由此建立了NFC梨汁品质等级判别函数,建模样本判别正确率为100%,可用于NFC梨汁综合品质定性的判别。
