基于联合变换相关器的Dempster-Shafer理论计算

提出了用联合变换相关器（JTC）来实现证据理论概率分配函数正交和的光学计算，在理论上对于如何用联合变像相关器实现证据理论分配函数正交和作了详细的讨论，并作了相应的仿真测试，结果显示该方法是可行的。与John Caulfield提出的用声光器件矢量外积实现的正交和计算相比，在该结构中由于采用二进制编码的数值计算，因此其计算精度得到了提高，同时对联合变换相关器输入端二进制编码的数值空间位置的适当调整可以直接得到所需要的证据理论正交和矢量，在处理步骤上得到了简化。

A new species of the genus Mekongina Fowler, 1937 (Cypriniformes: Cyprinidae) from South China

A new species of cyprinid fish, Mekongina lancangensis, is described from the upper Mekong River drainage in Southern Yunnan, China. The new species is distinguished from the other species of Mekongina occurring in the lower Mekong River drainage by posse

Dust weather records in Beijing during 1860-1898 AD based on the Diary of Tonghe Weng

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Studies of the ortho effect in fragmentations of acetyl ion adducts of disubstituted benzenes

The ion-molecule reactions of disubstituted benzenes under chemical ionization conditions with acetyl chloride as reagent gas were examined, and the fragmentation reactions of the adduct ions (mostly proton and acetyl ion adducts) were studied by collision-induced dissociation. Electron-releasing substituents favored the adduct reactions, and electron-withdrawing groups did not. The position and properties of substituting groups had an effect on the relative abundances of the adduct ions. Several examples of the ortho effect were observed. The fragmentation reaction of the adduct ions formed by ortho-benzenediamine with the acetyl ion was similar to the reductive alkylation reaction of amines in the condensed phase. Copyright (C) 2001 John Wiley & Sons, Ltd.