反应系数

A gas chromatographic method to determine the conversion of asymmetric hydrosilylation of acetophenone has been established.

建立了由气相色谱法测定苯乙酮不对称硅氢化反应转化率的定量方法，操作简便、迅速，重复性和精密度较好，多个样品各重复6次的变异系数均小于1％，且结果与1HNMR法测定结果一致。

We gain conditions for persistence for three-species of the system and global asymptotic stability for positive periodic solution of the system.

研究了一类具有扩散系数和 Holling 类功能反应的一捕两食三种群非自治捕食系统，得到了系统持久生存和周期系统存在唯一全局渐近稳定的周期解的条件。

Results indicate that the fluctuation of back electromotive force...

计算表明，受电枢反应和换向电感的影响，反电动势有较大波动，定位力矩的大小同磁化方向长度和极弧系数成正比关系。

It may be attributed to the segregated Ge acting as a diffusion barrier layer at the interface of 〓.

这可归结为〓界面的富Ge层充当了Co向Si〓Ge〓扩散的阻挡层，导致Co的有效扩散系数减小，降低了反应速率。

In Chapter 3,we discuss the Cauchy problem for reaction-diffusion system of Fujita'stype with singular coefficients.

第三章讨论具有奇异系数的Fujita型反应扩散方程组的Cauchy问题。

In a medium with pH 9.0 DBQADHP reacts with cobalt to form a green complex,exhibiting maximum absorbance at 670 nm,and the molar absorptivity is 7.6×104 L·mol-1·cm-1. Beers law is obeyed for 0～6 μg of cabalt in 25 mL solution.

实验结果表明：在pH9.0的缓冲体系中，显色剂与钴发生灵敏显色反应，形成绿色配合物，其最大吸收波长位于670nm，表观摩尔吸光系数为7.6×104L·mol-1·cm-1，钴量在0～6μg/25mL范围内遵守比尔定律。

On the basis of a great deal of the experimental data processing and analysis, the combustion converted account reaction rate constant, the unstable heat-exchange coefficient variation law between the airflow and the roadway rock and the codomain determined under different fire conditions have been provided with the correctness of the theoretical calculation formula for description of the airflow energy loss of the fire area tested and verified, a large number of the basic data concerning mine fires obtained.

通过大量实验数据的整理分析，给出了矿井火灾时期燃烧折算反应速率常数、风流与巷道岩石间的不稳定换热系数的变化规律及不同火灾条件下的取值范围，验证了火区风流能量损失理论计算式的正确性，并获得了大量的矿井火灾基础数据。

The paper includes:The author calculate the structures inner force and displacement of the free end , analyze the influence of the height and the value of pretress of cable by making use of ANSYS 9.0 soft, pose the concept of critical prestress,conclude the function relation between displacement of the free end, initial strain and the height of cable ,analyze the dynamic properity and point out that Newmark-β method should be adopted when we analyze the dynamic properity of the cable-stayed spatial structure with direct integral test to guarantee the contribution of high mode,finally conclude the functional relation among coefficient of earthquake inner force, initial strain and the height of cable, wish to get some helpful conclusion applied to cable-stayed spatial truss design.

本文系统介绍了斜拉空间桁架竖向地震反应的分析理论与方法、详细分析了斜拉空间桁架结构在静力和竖向地震作用下的受力性能，主要内容包括：利用通用有限元软件ANSYS9.0计算了斜拉空间桁架在静力和竖向地震作用下内力及自由端位移分布规律并得出地震内力系数与节间位置、预应力以及斜拉索高度之间的函数关系；详细分析了斜拉索中施加的预应力以及斜拉索高度的变化对于该种结构内力及自由端位移的影响并提出了斜拉空间桁架的临界预应变概念，进而得到了自由端位移与初始预应变以及斜拉索高度的函数关系，即：△=-(40h+2180)ε+9.8；分析了该种结构的动力性能，并指出：在时域内采用直接积分法计算该种结构的动力响应时，应该考虑采用不引起振幅率减小的Newmark-β法，以保证高阶模态响应的贡献仍然保留在响应中而不致于被忽略。

Model tests show that the calculation and analysis of the observational data regression coefficient of determination r2, NSC respectively, can predict the reaction process residues of the TOC.

检验表明模型的计算与观测数据回归分析的决定系数r2、NSC值分别为，可以预测反应过程TOC的残留量。

Because of the smaller diffusion coefficient, the diffusion of Li〓 in solid phase is usually the rate determining step.

由于扩散系数较小，因此Li〓在固相中的扩散一般为反应的速控步骤。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。