<正>通过外加不同强度的电磁场处理滨梅茎段外植体，以促进其不定芽的增殖。结果表明：对滨梅外植体施加强度为97kA/m磁场，处理10min，可明显地促进不定芽的增殖。其增殖倍数是对照的2.3倍。将经过97kA/m磁处理的外植体接种在培养基MS+ZT（2mg/L）+IBA（0.2mg/L）+Vc（30mg/L）上。芽的增殖倍数与幼苗高度、鲜重、干重都优于接种在培养基MS+ZT（2mg/L）+NAA（0.2mg/L）+Vc（30mg/L）和对照的情况?经97kA/m磁处理的外植体接种于优化生根培养基1/2MS+NAA（0.1mg/L）+IBA（0.1mg/L）+牛血清白蛋白（30mg/L）?诱导的不定根平均根长（5.39±0.68）cm，显著高于对照。说明培养基的优化与一定强度的磁场能有效地促进滨梅组培苗的增殖分化与生长。

A finite element analysis model of 20-node isoparametric elements was established by the commerce FEM software ABAQUS based on the of fracture mechanics theory. The crack at the bottom of the semi-rigid base course was numerically analyzed, and the crack extension life was evaluated by P-M rule and Paris formula. In the course of base crack extension the change of the stress intensity factor (SIF) (K1 and K2) was discussed, and the effect of pavement parameters on base fatigue life was studied. The results reflected that the law of pavement could provide scientific basis for anti-crack design of highway engineering.