本文在论述方法的可行性后，设计出了变色激光打标机，包括光路系统、控制系统等。
After proving the feasibility in theory, we designed color-changing laser marking system, including optics system, controlling system etc.
论述了周期-频度谱方法在分析数字化地震记录中的应用。
Applying period frequency spectrum method to analysis of digital seismic recording is discussed in this parer.
本文在重点论述几种常用背景估计方法的基础上，提出了形态滤波的优化改进算法。
On the basis of summarizing several current estimation means, a novel morphological filtering algorithm improved properly is proposed in this paper.
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