For the model with time-dependent birth pulses, using the stroboscopic map, the theory on bifurcation and numerical analysis, the existence and stability of the positive equilibrium are obtained.

对具有密度依赖生育脉冲的模型，运用频闪映射，结合分支理论和数值分析，得到了正平衡态的存在性、稳定性；

The method of control spatiotemporal chaos in coupled map lattice by delay feedback is researched and stability condition of control is discussed.

研究了一种延迟反馈控制耦合映象格子中的时空混沌行为的方法，讨论了实现稳定控制的条件。

The cells were tested for karyotype, sterility, contamination with exogenous agents and cross contamination, and analyzed for genetic stability by isoenzyme map.

进行无菌检查、细胞核型和同工酶谱分析，了解细胞遗传稳定性、外源因子污染和细胞间交叉污染情况。