薄层土
土卫八较暗的一面实在是非常的黑暗，它覆盖着土卫八正对公转的半球被认为在绕土星公转时被宇宙空间扫除了一些黑色的物质，所以它只是表面的一层不足一米的薄层。
It covers the moon's leading hemisphere - the side that faces forward as it moves in its orbit - which suggests that the black material has been swept up from space as the moon moves around Saturn.
推导了冲激荷载作用下薄层单元法的基本计算公式，运用这一方法对土中的波动传播进行了模拟，并给出了计算实例。
The formulation of thin-layer element method was derived, the wave propagation process was simulated by the method, and a calculation example was given.
研究发现，深厚黑土主要分布于黑土区北部，中厚与薄层黑土则分别集中在黑土区的中部和南部，这主要与黑土分布区的气候条件和黑土的成土过程有关。
It was found that the humus layer in black soil region was thick in north and thin in south, which was due to the climatic condition and soil-forming process.
应用推荐