查询词典 diffusion constant

The purpose of this thesis is to present a direct perturbative method to solving certain Fokker-Planck equation, which have constant diffusion coefficients and some small parameters in the drift coefficients.

中文摘要本篇论文应用微扰法来解某些Fokker-Planck方程式，而这种Fokker- Planck方程式具有扩散系数是常数以及漂移系数是很小的参数的特徵。

Using the probability relaxation model,we obtainedthat the diffusion constant and the relaxation time have the same temperaturedependence,denoting our view is correct.

分子动力学模拟计算的扩散系数和弛豫时间都遵从Vogel-Fucher关系，进一步支持了过冷液体的非指数弛豫的粒子逃离笼子的机制。

In the second part, a method studying stochastic transition which is the master equation method is introduced, and explicit solutions of velocity V and diffusion constant D of the steady state are obtained when a particle hops among a dimensional and periodic N states.

第二部分介绍了一种研究随机跃迁的方法—主方程方法，着重推导了粒子做一维周期性N态随机跃迁时达到稳态的速度、扩散系数的一般表达式。

In HgCdTe with low dislocation density, the main component is a Guassian like distribution and can be described by the Fick's law with a constant diffusion coefficient with a limited source as the boundary condition.

在缺陷密度比较低的碲镉汞材料中，砷扩散的主体符合恒定扩散系数的有限源扩散模型，呈现出浓度随深度的高斯分布。

The model was used to fit the release profiles of the above three different actives, and the diffusion coefficient and dissolution rate constant were obtained. Based on the modeling study, the relationship of porous microspheres structure, actives performances and release behavior was found, hence a theoretical basis was provided to optimize the microsphere synthesis and desired actives release profile.

采用提出的模型对三种活性物的体外释放实验数据进行拟合，求得不同活性物的有效扩散系数和溶解速率常数，揭示了微球结构、活性物性质和释放性能关系的一些基本规律，为指导微球合成、改善和控制活性物的释放性能提供了基础。

In order to exploit this effect to enhance diffraction efficiency, experiments of non-continuous holographic exposure were designed and conducted, The diffusion time constant of the material was obtained to be 21 s by fitting the experimental data of dark enhancement with theoretical model.

为了利用暗增长过程提高衍射效率，设计并实施了非连续曝光实验，使曝光与暗增长过程交替进行。

And then, the direct boundary integral equation of convection-diffusion was obtained by using inverse transformation, which is a discrete by using constant elements.

然后，通过逆变换推导出对流扩散方程的直接边界积分方程和解的积分表达式，并采用常单元来离散边界积分方程，完成对流扩散方程的求解。

The diffusion coefficient of Li〓 in solid phase determined by constant potential step method is about 10〓cm〓/s.

采用恒电位阶跃方法测定Li〓在固相中的扩散系数为~10〓cm〓/s。

The general diffusion process can be obtained as a limiting case, so that we have a unified framework in understanding existing models in option pricing theory, including the geometric Brownian Motion, the model of Constant Elasticity of Varianc, the Residual Volatility and term structure of interest rates. Our model is capable of demonstrating volatility smile and stable relative deviation from real data.

我们建立的一般框架可以统一理解目前已经熟知的几何布朗运动、广义方差常弹性、残余波动率、利率的期限结构等理论模型，也能描写观察到的波动率微笑和稳定的相对偏差。

Accordingly, the accident of sulfide stress corrosion cracking should be taken into account.The SSCC sensitivity and cracking time of 16Mn steel used to make the cold-high pressure segregator and common 16Mn steel in solutions with various H2S contents and pH values, simulated solution and operating solution were investigated by constant strain bend and slow strain rate test.Hydrogen diffusion coefficients of 16Mn steel, 16Mn steel and their welded seams were also tested by the electrolyte hydrogen charged method.Safety evaluation of the cold-high pressure segregator was given with above results.

针对制造过程中由于开孔失误而进行补焊的冷高压分离器在高压、高浓度的H2S环境的使用安全问题，采用了电化学充氢、恒应变和慢拉伸的实验方法，研究了制造冷高压分离器的主体材料16Mn钢和普通的16Mn钢及其焊缝的氢扩散系数，在不同H2S浓度、pH值，模拟冷高压分离器操作环境溶液和实际溶液中的腐蚀规律和硫化氢应力腐蚀开裂敏感性，结合实际腐蚀环境的检测和分析结果，对补焊后的冷高压分离器的使用安全给出了综合评估。

The changes of the HAF after liver injury may be related to the volume of blood loss, the intraabdominal pressure and the pneumoperitoneum duration.

肝撞击伤伴失血后肝动脉血流量的变化与失血量、气腹压力以及气腹持续时间等有密切联系。

Reneging on our commitments to the world's poor cannot be an austerity measure, she said.

放弃我们给世界上的穷国的承诺不能成为一种紧缩措施。