查询词典 coefficient of diffusion

Fourth, in the view of technological system, the intrinsic characteristics of innovation diffusion are embodied in the diffusion process of technological knowledge.

所转移的技术知识涉及的不仅是边际交易费用为零的纯粹科学知识。

Secondly, regarding the diffusion rate as a bifurcation parameter, we show that the one-dimensional competition diffusion system with infinite delay and Dirichlet boundary condition exhibits the spatiotemporal structure near the steady state of the system.

介绍问题的生物学背景，概述Logistic模型和Volterra模型的研究历程并提出我们所研究的课题，另外还给出了所需的基础理论。

Rate constant of ONOO〓 formation, which is access to diffusion-controlled limit, is as three times as that of dismutation of O〓〓· by superoxide dismutase, and much faster than that of reaction of NO with hemecontaining proteins, thus demonstrating that ONOO〓 can form as long as NO meets O〓〓· during their diffusion in biological milieu.

ONOO〓在体内生成有较充分的理论依据。ONOO〓的生成速率接近于受控制的弥散极限，比超氧化物歧化酶歧化O〓〓·的速度快3倍，远远超过NO与血红素蛋白的反应速度。

Chapter 1 gives the background,current research process of relatedproblems and summarizes this thesis\'s work.In chapter 2,we study the Brownian motion with holding and jumping on the boundary.We use the resolvent method to obtain the infinitesimal generator because the domain of the infinitesimal generator is essentially the same as the range of the resolvent.Knowledge of this range and of the differential operator determines uniquely the infinitesimal generator.Since the semigroup generated by the DHJ is not strongly continuous,to use the nice property of strongly continuous semigroup in analytic theory,in chapter 3 we show that the dual is strongly continuous and derive ergodicity through spectral radius formulas and finally obtain the ergodic theorem by duality. In chapter 4,we discuss a class of a more general process---one dimensional Feller diffusion proposed by W.Feller in 1954.The Feller diffusion allows the possibility of jumps from boundary to boundary,not only from boundary to the interior.We give the stationary distribution of this process.

具体地，本文的结构如下：第一章给出了问题产生的背景，研究现状及本文的主要工作；第二章研究了在边界上逗留后随机跳的布朗运动，我(来源：3dABC论文网www.abclunwen.com)们用预解算子的方法得到其无穷小生成元，因为无穷小生成元的定义域本质上就是预解算子的值域，知道这个值域和微分算子形式就能唯一地决定无穷小生成元；由于DHJ过程产生的半群不是强连续的，为利用强连续半群的一些漂亮性质，在第三章中我们证明其对偶半群是强连续的，然后由谱半径公式得到遍历性并且最后由对偶得到遍历定理；第四章讨论了Feller在1954年引入的更广的一类过程----一维Feller扩散过程，Feller扩散过程允许有从边界到边界的跳发生，即不仅仅局限于从边界到内部的跳，在这一章中，我们给出了一维Feller扩散过程的平稳分布；在第五章，我们讨论了一些相关的问题，给出了DHJ过程对应的PDE问题及特征值与收敛速度的关系。

Decreasing N diffusion width and distance between N diffusion and emitter of minority carriers current can increase MAAP efficiency.

由模拟结果可知，减小N型扩散区的宽度，减小N型扩散区与少数载流子发射极之间的距离，增加P型扩散区的掺杂浓度以及使第二个衬底接触浮空可以有效地提升多环有源保护结构的效率。

Theoretical analysis and comparison between computational results and experiments show that crossflow diffusion caused by grid lines is the most important error and grid line justification is the effective way to decrease crossflow diffusion.

理论分析和数值与实验间的比较结果表明，由于网格线的不合理布置导致的伪扩散误差是切向燃烧流场模拟中的主要误差。

After simplification of the Jou model,a diffusion dynamic equation, which was characterized with hyperbolic type, was obtained, then simulative analysis for three combined dimensionless parameters was done to research various diffusion behavior resulted from the change of model parameters.

经过对Jou模型的简化处理，得到了双曲型的扩散动力学方程，通过对模型中3个组合参数的仿真分析，研究了参数的变化可能导致的不同的扩散行为。

Thin film equations; nonlinear cross-diffusion systems; two-dimensional nonlinear reaction-diffusion equations; invariant subspace method; invariant sets

基础科学，数学，数学分析薄膜方程；非线性交错扩散方程组；二维非线性反应扩散方程；不变子空间方法；不变集

All enhancers did not significantly change the transcorneal lag time of ENX. The irritancy of poloxamer and Azone was observed.? The results of in vitro release studies showed that the ENX gel based 3% HPMC K4M and 3%HPMC F4M povided sustained release of the drug over an 8-h period in vitro.Diffusion area has significantly effect on drug release, and pH value of medium and rotation rate have effcet on drug release.However, the diffusion shield has no effect on drug release. The P_ value of the preparation based on 3% HPMC F4M was 1.34-fold of conventional eye drops of ENX.

体外溶出度试验结果表明，以3％的HPMC K4M和F4M为基质制备的ENX凝胶剂的体外释放行为符合眼用缓释制剂的要求；体外释放度影响因素试验结果表明，释放面积对释放度有显著性影响，pH值和转速略有影响，而扩散屏障没有影响；离体角膜透过实验结果表明，以F4M为基质制备的凝胶剂中ENX的表观渗透系数P_(app是对照组的1.34倍，说明F4M与眼角膜的相容性较好，是一种理想的眼用制剂增稠剂，可以在眼用制剂中广泛采用。

Active sites of a certain concentration are distributed randomly over inactive sites, forming the model of two- dimensional lattice of active sites distribution. Diffusion, especially directional diffusion, of the adsorbed particles is taken into account on the basis of ZGB model.

模型假设，一定浓度的活性位随机分布在非活性位上，形成了活性位分布的二维格子模型反应器，并在ZGB模型的基础上，考虑了氧原子和CO分子的表面扩散，特别是引进了吸附粒子的定向表面扩散。

Metrorrhagia is also gynaecological problems of common diseases.

崩漏是妇科常见病也是疑难症。

WordFTP gives you the convenience and timesaving you need.

wordftp让您的方便和省时您所需要的。