According to the spike-liked weld profile in electron beam welding, a penetration model of the combination of moving Gauss area heat source and moving cylindrical volume heat source is presented, which based on the effects of energy absorption and redistribution in the melt pool and keyhole. 针对深熔电子束焊特有的钉形焊缝形貌特征,在综合考虑了熔池和匙孔中能量吸收与再分布效应的基础上,建立了高斯面热源和圆柱体热源组合的移动热输入数值模型。
In situ measurements of soil respiration were carried out in the most dynamic area with respect to soil redistribution in one consecutive growing period ( 2011). 在一个连续的生长期(如在2011年),对最活跃的区域进行关于土壤再分布的土壤呼吸的现场测量。
Road construction in permafrost area will inevitably change the natural hydrothermal conditions of the soil, the redistribution of temperature field will cause the embankment and the limit change of surrounding permafrost, leading to thaw disaster, and then damage pavement performance. 多年冻土区公路修筑不可避免地将改变土体天然水热状况,温度场重新分布将引起路堤及周围多年冻土上限发生改变,进而产生融沉等病害。