基于动态Spike and Slab先验,结合删失时间序列的似然函数,构建了适用于删失时间序列数据的贝叶斯动态变量选择回归模型.为处理计算问题,采用了EM算法进行求解,从而能够快速获得模型参数估计与变量选择结果.通过模拟研究验证了该方法的...基于动态Spike and Slab先验,结合删失时间序列的似然函数,构建了适用于删失时间序列数据的贝叶斯动态变量选择回归模型.为处理计算问题,采用了EM算法进行求解,从而能够快速获得模型参数估计与变量选择结果.通过模拟研究验证了该方法的有效性,并将其应用于实际磷浓度数据分析中.展开更多
The solidified structures of horizontally continuous casting（HCC） of super-thin slab and its relations with the current were studied under the electromagnetic vibration（EMV）.The results show that,under the action ...The solidified structures of horizontally continuous casting（HCC） of super-thin slab and its relations with the current were studied under the electromagnetic vibration（EMV）.The results show that,under the action of the periodical forces from EMV,the solidified structures of the super-thin slab of pure tin is greatly refined,and the extent of grain refinement is increased with the magnitude of alternating current.For the Sn-10%Pb alloy,it is shown that the EMV promotes the growth of equiaxed grains in the center of super-thin slab,and the grains are refined with the alternating current increasing.This is useful to prevent some solidification defects in the horizontally continuous casting of super-thin slab,such as columnar grains butting,porosity,inclusions and gases gathering,and composition segregation in the centre of slab.展开更多
基金Project(50674066)supported by the National Natural Science Foundation of China
文摘The solidified structures of horizontally continuous casting（HCC） of super-thin slab and its relations with the current were studied under the electromagnetic vibration（EMV）.The results show that,under the action of the periodical forces from EMV,the solidified structures of the super-thin slab of pure tin is greatly refined,and the extent of grain refinement is increased with the magnitude of alternating current.For the Sn-10%Pb alloy,it is shown that the EMV promotes the growth of equiaxed grains in the center of super-thin slab,and the grains are refined with the alternating current increasing.This is useful to prevent some solidification defects in the horizontally continuous casting of super-thin slab,such as columnar grains butting,porosity,inclusions and gases gathering,and composition segregation in the centre of slab.
