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 first problem to be solved is to map DNA sequences onto numerical sequences in bio-molecular sequence analysis by mathematical, physical and digital signal processing methods.
DNA序列的数值映射是用数学方法、物理方法和数字信号处理方法分析生物分子序列首先要解决的问题。
The frequency degree of being visualized was determined by using the land utilization map, numerical model of topography and the incident angle of sight.
通过地形及土地利用图、数值地形模型和视线入射角来确定景观的被视频度；
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