impaction

By the contrast analysis, we find that rainfall and tree layer crown density are the main factors which had impaction on the canopy interception, throughfall and stemflow. ( 4) The maximum interception capability of the forests.

通过对比分析，得出：降雨量和乔木层郁闭度是影响森林林冠截留、穿透雨和树干流大小的主要因子。（4）森林的最大截留量分析。

Instead of using continuous variables topology optimization, discrete variables topology optimization is used in multi-damage identification of two-dimensional structure with the hole damages to avoid the possible negative impaction which is brought by the threshold parameter determination in using continuous variables topology optimization.

采用离散变量变量拓扑优化代替连续变量拓扑优化对发生孔洞损伤形式的二维结构进行损伤识别，避免了利用连续变量拓扑优化进行损伤识别时参数阈值的确定可能给识别结果带来的不良影响。

Objective To inquire into the mechanism of the impaction of the third molar.

目的探讨下颌第三磨牙阻生的机理。