关于n-关系3-流形的等价性

本文讨论了n-关系3-流形的等价性及其在辛群中表示的对应关系。

一类n-关系3-流形的特征

本文给出了一个(?)-关系3-流形M=V_(?)((?)_(?))同胚于一个亏格为g^(-(?))的把体和一个边界为S^2的3-流形的边界连通和的代数的和几何的充要条件。

一般关系下的n-阶FC-粗糙集模型

给出一般模糊环境下n阶-FC-粗糙近似算子的定义,讨论它的一些性质,并通过α-水平集给出各种n-阶模糊粗糙集的表示。进而给出模糊传递闭包近似算子的定义,得到相应的结果。

Relationships Between Average Molecular Mass and Intrinsic viscosity of Three Typical Polyanhydrides

Aim To study the relationships between average molecular mass and intrinsic viscosity of polyanhydrides. Methods With chloroform as solvent and petroleum ether as the precipitating agent polyanhydride was separated into a series of grades with different average molecular mass. The absolute average molecular mass (M) and intrinsic viscosity ([]) of every grade were measured. Results and Conclusion The relationships between [] and M of three typical polyanhydrides were obtained from bi-logarithm coordinate plotting of [] versus M.