According to the result of analysis , it is advisable to invoke the general evaporation model should the avoidance of the overestimation on the strain energy release rate for very thin package cases be desired 此外，计算结果还显示：影响“爆米花”式断裂的主要可控因素是扩散系数d 。和蒸发系数f卜其中，蒸发系数f 。
Abstract : the average diffusion coefficient of carbon in surface layer of steel 20 rare ea rth carburized at 880 and 900 for 8 h was calculated by substituting the mea sured layer depths into the diffusion equation 文摘:通过对20钢常规气体渗碳和稀土渗碳层深的测定，计算出稀土渗碳时碳在奥氏体中的平均扩散系数。
The calculated results show that the main reason why the g as carburizing process is accelerated is due to the obvious increase in the diff usion coefficient and transfer coefficient of carbon resulted from the addition of re 稀土元素加速渗碳过程的主要原因是增加了碳在奥氏体中的扩散系数，同时提高了碳的界面传递系数。
1 . the moisture diffusion in plastic electronic packaging was investigated from both experiment and finite element simulation . the diffusion coefficient and the saturate concentration were determined on the pick ' s law 利用实验称重和fick扩散方程模拟塑封材料对水的吸收过程，得到水汽在实验塑封材料中的扩散系数和饱和浓度。
The experiments showed that , as compared to the conventional dyeing , the diffusion coefficients increased more with raising the bath voltage and temperature , indicating the dye uptake rate could be improved with electro - chemical dyeing 实验表明：当槽电压和温度增加时，扩散系数均比常规染色增加，说明电化学染色可以增加染料的上染速率。
From the concentration dependence of bsa apparent diffusion coefficients , protein interaction parameters have been regressed . it bears a net effective charge of - 9 . 0 and has a hamaker constant of 2 . 8ket 根据扩散系数随蛋白浓度变化的斜率与离子浓度变化的相关性，回归出了蛋白相互作用参数，蛋白所带的有效电荷zp二一9 . oe 、 hamaker常量= 2
And the diffusion coefficient of leakproof laminate is tested to get the diffusion time in seawater , which shows that the properties of leakproof laminate can meet the technology requirements of leakproof in two years 同时测定了防渗漏层的扩散系数，确定了防渗漏层抗人工海水的扩散时间，结果表明防渗漏层可达到防渗、抗渗2年的技战术指标。
