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。
Based on the thermodynamics for getting activity coefficient, a symmetry equation was established for calculating inter-diffusion coefficient . the calculated data coincide well with the experimental ones found in literatures t匕较而台,二种复合材料中scs一6sic/tizainb的界面反应程度较轻,与热力学预测结果一致。
The paper amends the calculation method of both diffusion coefficient and inducing coefficient and thus makes the coefficients more meaningful and clarifies the economic meaning of two coefficients 评论:此文摘只有一句话,由两个分句组成,用的是一般现在时,两个分句均用的是主动语态,表明了文章的目的和意义,值得借鉴。
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。
Measurement of the steady and non-steady-state chloride diffusion coefficients in a migration test by means of monitoring the conductivity in the anolyte chamber comparison with natural diffusion tests 很多混凝土科学工作者都在积极努力的发展氯离子传输和检测理论及试验室方法,目前理论及试验室检测标准众多,但尚无明确的现场检测标准。
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。
Dynamic light scattering ( dls ) is a new experimental technique . it can measure diffusion coefficient of macromolecule in solutions rapidly and exactly, and the size or dynamic radius of macromolecule can be obtained 动态光散射技术是一门新兴的实验技术,利用该方法能快速、准确地测定溶液中大分子的平动扩散系数,从而得知其大小或流体力学半径及其分布。
By analyzing of the potentiostatic transients, the diffusion coefficient d of the depositing nickel ions and saturated nucleus number density nsat were estimated, the effects of applied potential on nucleation and growth ware also discussed 通过分析恒电位暂态曲线,求出镍离子的扩散系数d,以及不同外加电位下的饱和晶核数密度n_(sat),探讨了外加电位对成核作用的影响。