给出了问题径向正解的非存在性，解的振荡性及有界性的充分条件，并对有界解进行了估计。
The nonexistence theorem of radial positive solution, sufficient conditions of oscillation and boundedness of radial solution and estimation for bounded solution are given in this paper.
本文给出一些充分条件，使振荡函数的含参量积分保持振荡性。
In this paler we give some sufficient conditions, such that integrals of oscillatory functions with a parameter remaining oscillatory.
本文研究了一类三种群周期食饵系统，并给出了其存在平稳振荡的充分条件。
The following three species periodic predator-prey system is considered, the sufficient condition for the existence of a globally and asymptotically stable periodic solution of the system is obtained.
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