查询词典 diffusion

The mutual diffusion coeffcients between diluent and nonsolvents were calculated and discussed relating to membrane formation.

膜结构的不同和稀释剂与冷却介质之间的相互扩散速度、冷却介质的传热系数有关。

Microstructure properties of gas diffusion layer in PEM fuel cells were described by fractal dimension s in fractal theory.

采用分形理论中的重要参数分形维对质子交换膜燃料电池扩散层的微结构特征进行描述。

The process of dip pen lithography involves the adsorption of ink molecules on AFM tip ,the formation of water meniscus ,the transport of ink molecules ,and diffusion of ink molecules on the substrate .More factors such as temperature ,humidity ,tip ,scanning speed and so on will influence the process of dip pen lithography .

蘸水笔技术的刻蚀过程包括AFM 针尖对墨水分子的吸附、针尖与基底间弯月液桥的形成、墨水分子在液桥中的传输、墨水分子在基底的扩散等四个阶段，并受温度、湿度、针尖、扫描速度等多种因素的影响。

When there are diffusion effects and Dirichlet boundary conditions, we firstly obtain the conditions such that the system exists positive equilibrium solutions and give the asymptotic expression of these positive equilibrium solutions.

在具有扩散影响和Dirichlet边界条件时，首先利用隐含数定理获得了系统存在正平衡解的条件和正平衡解的渐近表达式。

This paper,in which the blow-up rate of the blowup solutions is evaluated with appropriate hypotheses,considers the blow-up rate of a degenerate reaction-diffusion system with homogeneous Dirichlet boundary conditions.

文中考虑了一类退化反应扩散系统在齐次D irichlet边界条件下的爆破速率。在适当的假设条件下，得到了爆破解的爆破速率估计

In Chapter 1, we use the upper and lower solutions method, the bootstrap technique and the Schauder fixed point theorem to investigate the existence of periodic solutions and the asymptotic behavior of general time-dependent solutions for periodic reaction-diffusion systems of the following three types:(1) Quasimonotone nondecreasing system;(2) Mixed quasimonotone system;(3) A nonquasimonotone 2-system. The boundary conditions are assumed to be either the Dirichlet condition or linear Robin conditions.

在第一章，我们应用上、下解方法，bootstrap技巧和Schauder不动点定理考察如下三类周期反应扩散方程组的周期稳态解的存在性和一般的时变解的渐近性态：（1）拟单增系统；（2）混拟单调系统；（3）一个非拟单调2-系统，其边界条件是Dirichlet条件或线性Robin条件。

Second, we consider the strongly coupled elliptic system with homogeneous Dirichlet boundary conditions. The prior estimates for thesolution of nonlinear elliptic system are derived. It is shown that there is no coexistence state if diffusion rates are strong, or if the intrinsic growth rates are slow.

第二章研究带齐次Dirichlet边界条件的强耦合椭圆系统，首先推出非线性椭圆系统解的先验估计，然后证明了当食饵和捕食者的扩散率足够大，或者出生率足够小时，系统不存在共存现象，并给出半平凡解存在的充分条件。

Furthermore a definition of the Dirichlet problem with vibrational boundary for the diffusion equation is given.

lder连续函数。本文解决了上述扩散方程的随机Dirichlet问题的解在S_3内存在性及唯一性问题。

In part two, we study the Dirichlet problem for a reaction-diffusion system of three species: a predator, a mutualist-prey and a mutualist.

第二章讨论了一类具有扩散的捕食-食饵-互助系统共存态的存在性问题。

Since the dismutation of superoxide radicals by SOD is a reaction that is rate-limited by diffusion and enhanced by electrostatic guidance, all these structural features may be related to GP-MnSOD's high catalytic activity: first, Lys38 may increase the effective enzyme-substrate association rate by enhancing the electrostatic gradient at its substrate channel; second, an excess of acidic over basic residues makes the negative surface potential of GP-MnSOD more larger than those of other known MnSODs. This may enhance the reaction rate by reducing futile collisions of superoxide radicals with GP-MnSOD's surface.

因此，GP-MnSOD的上述结构特征可能与GP-MnSOD的较高酶活有关：首先，Lys38增加了底物通道口的正静电势梯度，从而可能促进了GP-MnSOD的活性中心与底物的有效结合速率；其次，GP-MnSOD表面覆盖的过量酸性残基使得它比其它MnSOD在底物通道以外的蛋白表面更多地被负静电势所覆盖，这可能有效地减少了超氧阴离子与GP-MnSOD表面的无效碰撞，从而提高了反应速率。

Sodium citrate; calcium carbonate; calcium hydroxide; potassium bicorbonate; magnesium carbonate; ferrous sulphate; Zinc sulphate; copper sulphate; manganese sulphate; potassium iodide; sodium selenite.

柠檬酸钠；碳酸钙；氢氧化钙；碳酸氢钾；碳酸镁；硫酸亚铁；硫酸锌；硫酸铜；硫酸锰；碘化钾；亚硒酸钠。

All this to say that I'm glad filmmaking hasn't become completely ironic. I can enjoy an ironic film as much as the next person, but they usually involve a message of some sort. One that's delivered in a smirkingly clever way that requires little in the way of talent.

所有这些都是说，我很高兴电影制作没有变成完全讽刺艺术，我可以和下一个人一样享受讽刺电影的乐趣，虽然他们经常会被划归到一定级别，技术方面不需要很高的才能。