一类

In the last chapter, oscillations of a system of hyperbolic equations are deduced from the corresponding properties of an ordinary differential inequalities by using eigen function and Green formula, etc.

第五章研究了一类脉冲时滞双曲方程组，利用符号函数，特征函数，Green公式等有力工具将其解振动与否转化到讨论一类脉冲微分不等式是否有最终正负解来研究。

A solution to the first kind of Fredholm integral equation is developed for step functions by means of Walsh function. The electromagnetic inverse scattering problem governed by the first kind of Fredholm integral equation is an ill-posed problem.

在地球物理反演中，通常归结为阶梯函数的第一类Fredholm积分方程，文中给出了该积分方程的沃尔什函数解法。由第一类Fredholm积分方程所描述的电磁逆散射问题是非适定问题。

A kind of novel PU and poly ( acrylate-co-methyl methacrylate) s with nonlinear optical conjugated group were synthesized. Their properties were studied.

本论文合成了一类含非线性生色团的长侧链的聚氨酯和一类聚丙烯酸酯及其与甲基丙烯酸甲酯的共聚物，并对它们的非线性光学性能进行了研究。