The results indicate that this ion exchange process is controlled by particle diffusion;
结果表明，该离子交换过程近似符合颗粒扩散控制；
This simple result is at the root of the arithmetic and algebra of Brownian motion and particle diffusion.
这个简单的结果是粒子扩散和布朗运动的算术和代数基础。
The mechanism of particle diffusion control for ion exchange process was determined by indirect judgment method.
通过间接判断法，确定离子交换过程为颗粒扩散控制过程。
When intra-particle diffusion limitation is important, the use of non-cylindrical catalysts can increase superficial reaction rate markedly.
对于颗粒内扩散控制的催化反应过程，采用异形催化剂可以显著提高表观反应速度；
Adsorption was controlled by interfacial diffusion and particle diffusion, and this two kinds of adsorption process happened at the same time.
吸附受界面扩散和颗粒内扩散控制，两种吸附过程同时进行。
It was found that the rate of ion exchange depends on the migration of individual ions and that the particle diffusion coefficient changes with the fractional attainment of equilibrium.
个别离子的迁移率对交换速率有影响，粒子扩散系数随平衡分数而改变。
Calculating results show that it is available to study the tiny particle diffusion by means of measuring and analyzing the room airflow movement in an air conditioning and cleaning room.
计算结果表明，在空调净化房间通过测量分析气流的运动规律来研究气流中微小粒子的扩散规律是可行的。
Finally, under the three-dimensional ECOM model, the Particle-tracing Method is applied to the numerical modeling of the Changjiang Estuary sewage diffusion.
最后，本文在三维ecom模型下把质点跟踪法应用到了对长江口污染物扩散的数值模拟中。
The diffusion of a particle or molecule with respect to a stationary frame of reference was discussed in the preceding chapter.
一个粒子或者分子相对于稳定参考系统的扩散已在前一章中作过讨论。
The results show: external diffusion is control process for mass transfer, and increasing air velocity and decreasing particle diameter are effective measures to decrease mass transfer resistance.
研究结果表明：外扩散过程是传质的控制步骤，增大风速、减小吸附剂颗粒直径是减少传质阻力的有效措施。
This model can reduce the computer memory and save time, simulate the complex process of the particle phase and use Lagrange method to reduce the false diffusion.
此模型在不过分耗费计算机存储量及机时的条件下，能够模拟有复杂经历的颗粒相，而且颗粒相用拉各朗日方法可以减小伪扩散。
The importance of diffusion processes can be gauged by comparing the distances which a particle travels under the influence of gravity and diffusion.
扩散过程的重要性可以通过比较粒子在扩散和重力影响下经过的距离来衡量。
The results show: external diffusion is the main resistance for mass transfer, and increasing air velocity and decreasing particle diameter are effective measures to decrease mass transfer resistance.
研究结果表明，外扩散过程是传质的主要阻力，增大风速、减小吸附剂颗粒直径是减少传质阻力的有效措施。
The direct motion of Brownian particle is considered as a result of system derived by external non-equilibrium fluctuation. A corresponding diffusion model is proposed.
将布朗粒子的定向运动，看作是系统受到外部非平衡涨落作用的结果，并建立相应的扩散模型。
The Random Particle-Track model simulate the turbulent diffusion.
颗粒的湍流扩散是通过随机轨道模型来模拟的。
Results showed that the smaller the diameter of aerosol particle was, the bigger the Brownian diffusion deposition was.
结果表明，气溶胶粒子的粒径越小，布朗扩散越显著；
A numerical model for turbulent fluctuation and diffusion of gas-particle flows is presented.
本文提出了气固两相流动的湍流扩散数学模型。
This is a particle model. A Random particle method is used to simulate the diffusion process.
这是一个使用粒子追踪方法的模型，利用随机走步法模拟扩散过程。
Studying Brownian motion by the difference equation, We can find that the partial differential equation describing the Brownian particle motion is a diffusion equation in mathematical physics.
引入差分方程研究布朗运动，会发现极限情况下的布朗运动所遵循的偏微分方程就是数学物理方程中的扩散方程。
Diffusion is inversely proportional to the mass of matter, and the smaller the particle is, the more serious the diffusion is.
扩散与物质的质量成反比，颗粒越小扩散越严重。
The particle transport consists of outward diffusion and inward convection.
粒子输运由向外扩散和向内对流构成。
The differential equations of coal particle gas diffusion under the third kind boundary condition and its analytical solution have obtained on the basis of theoretical analysis.
基于理论分析建立了第三类边界条件下的煤粒瓦斯扩散方程，并给出了解析解。
This paper presents a new concept that particle concentration enrichment process through deceleration and diffusion process is the basis of fuel rich combustion technology.
提出了颗粒的滞止浓缩过程与弥散过程是浓缩煤粉燃烧技术的基础这一新概念，并分析了滞止浓缩过程与弥散过程的原理。
Not only convection but also random diffusion of substantial particle and their sediment are considered in the model.
该模型不仅考虑了质点在海水中的对流运动，而且还用大量质点的随机扩散模拟湍扩散过程。
Fifthly, based on the consideration of sediment diffusion because of sediment particle interaction, the equation of vertical distribution of sediment concentration is derived.
五是在考虑泥沙颗粒碰撞扩散的基础上，推导了泥沙浓度沿垂线的分布规律。
Without repeated interpolations such as in ELM, the Particle-tracing Method reduces the numerical diffusion quite a lot.
因为没有像欧拉·拉格朗日方法那样反复插值，所以质点跟踪法极大地降低了数值耗散。
In this paper, the finite difference method is used to solve the diffusion equation and the spherical particle is discretized with iso-spacing grids and iso-volumetric grids respectively.
采用有限差分法数值求解扩散方程，分别利用等距网格和等体积网格划分计算区域。
The gas diffusion through the inter-particle and the product layer was the mainly factor on the reaction rate.
一定温度下的速率先增加后减少最后趋于平缓．这是由气相在吸收剂颗粒间的扩散和在产物层内的扩散引起的。
Objective in the accident conditions, the radioactive particle size and diffusion characteristics and its inhalation risk of plutonium dioxide were further investigated.
目的进一步研究在事故状态下，氧化钚放射性微粒的扩散特征和粒度特征及其吸入危险性。
Objective in the accident conditions, the radioactive particle size and diffusion characteristics and its inhalation risk of plutonium dioxide were further investigated.
目的进一步研究在事故状态下，氧化钚放射性微粒的扩散特征和粒度特征及其吸入危险性。
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