...etection, Modified Laplacian, Directional Field, Position Mask. [gap=201]关键词：改进的拉普拉斯算子，边缘检测，方向场，位置面膜。
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time variable directional field 时变方向场
weighted averaging gradient directional field 加权平均梯度方向场
We introduce the concept of time-variable directional field, and establish the stable and unstable theorems by the qualitative method.
引入了时变方向场的概念，用定性方法建立了稳定及不稳的定理。
The results indicate that this shielding effect has obvious difference to the different directional field. The coil case presents relatively strong shielding ef...
研究结果表明，线圈盒对磁场的屏蔽效应因磁场的方向不同有很大的差别，线圈盒对切向磁场的渗透呈现较强的屏蔽效应。
The young turtles, however, use the field primarily as a source of directional information for maintaining a heading.
然而，幼小的海龟主要利用磁场作为维持前进方向的信息来源。
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