简单波的解析解

Riemann于1860年给出了简单波的一般解,可是欲将其中所含的一个任意函数的具体形式按边界条件或初始条件求出来,却难以实现,因而对具体问题就难以深入探讨.本文按拟线性偏微分方程的几何理论,十分方便地给出了由边界条件或初始条件所确定的简单波解析解,并用这些解讨论了有关流动的性质,且得到了若干新颖的结果     

Ni2+、联吡啶和N-苯基亚氨基二乙酸三元金属混配配合物的合成与表征

N-苯基亚氨基二乙酸、2 ,2′-联吡啶和 Ni Cl2 · 6 H2 O在溶剂中进行自组装形成了一种新的三元金属混配配合物。用元素分析、热重分析、红外和紫外光谱对配合物的组成和结构进行了表征 ,初步确定配体N -苯基亚氨基二乙酸中的 2个羧基为单齿形式与中心金属离子 Ni2 配位。     

关于刚体平衡的条件

本文提出一种方法，证明刚体平衡的充分条件：对于初始时刻静止的刚体，若诸外力的矢量和为零以及诸外力对某任一固定点的力矩的矢量和也为零，则此刚体一定平衡．     

Analytic solutions of simple waves

B.Riemann furnished the general solution of simple waves in1860.But it is difficult to find out the exact forms of the arbitrary function contained in the general solution which must satisfy boundary or initial conditions.For this reason it is inconvenient to probe into the characteristics of concrete problems.In this paper the analytic solutions of simple waves are afforded according to the geometric theory of quasi-linear partial differential equation,and they are determined with boundary or initial conditions.By using these solutions the specific properties of certain flows are discussed and novel results are obtained.