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By the reason of the balance between water and air, the porosity property seems to be the most important parameter of substrate quality among these characters. This article tried out the results which the 5 different granule sizes vermiculite affect on the physical characters, water constants and maidenhair.

本试验研究了5种不同颗粒粒径的蛭石对其物理性质、水分常数和孔雀草苗期生长的影响，结果表明，基质总孔隙度在70%～90%，大小孔隙比在1：2左右时均能满足作物苗期生长的要求。

How to perform data manipulation in order to extract information such as reaction order and rate constants from experimental kinetic data

怎样对所获得的动力学实验数据进行处理，以获得诸如反应级数和速率常数的资料

It also supports physical and mathematical constants like pi number or electron mass.

还支持物理和诸如圆周率或者大规模电子数值的计算。

Making use of unit stiffness matrix of the lead rubber bearing, obtained nine material constants of the orthotropic material unit by using back analysis.

利用铅芯橡胶支座的单元刚度矩阵，反分析出其作为一个正交各向异性材料单元的九个材料常数。

The constants in the curves are estimated by a mathematical programming method to be in agreement with the maximum likelihood principle. Availability of the approach has been indicated by an analysis of the S-N data of 45＃ carbon stell-notched specimens (kt=2.0) subjected to fully reversed axial loads.

曲线中的材料常数按极大似然原理采用数学规划法求出。45＃碳钢缺口试样kt＝20）对称循环加载试验数据的分析说明了方法的有效性。

According to the values of pHPZNC, N s and structural negative charge density measured, the intrinsic surface reaction equilibrium constants, p K of 1-p K model, p K a1int and p K a2int of 2-p K model, were directly calculated to be 3.37, 2.42 and 4.32, respectively, for the meadow brown soil in northeast of China.

根据实验测定的pHPZNC， N s和结构电荷密度值直接计算得出东北草甸棕壤样品的界面反应特征平衡常数即1-p K 模型中的p K ， 2-p K 模型中p K a1int和p K a2int，分别为3.37， 2.42和4.32，与文献报道的沉积物和蒙脱土的值相吻合。

In the chapter 3,we base on the existence of periodic solution ,using the method of linearization and applying the mean value theorem and the variation-of-constants formula, we get the sufficient condition of the exponential stability of periodic solution of a class of nonlinear functional differential system .

在第三章中，建立在系统周期解存在的基础上，利用线性化的方法，根据微分中值定理和常量变差公式，得到了一类非线性泛函微分系统周期解指数稳定的充分条件。

At the same time, we calculated the reaction rate constants of the mercuric oxidation by chlorine species to compare with the corresponding experimental data.

同时对煤燃烧过程的氯化汞系列化合物的反应动力学常数进行了理论计算。

Crystal lattice constants are close to other experiment results. Three kinds of chemical bonds exist among Mg and B atoms, between magnesium and boride is ionic bond and metallic bond is the predominant interaction in the layer formed by magnesium atoms. A strong covalent bond in the form of sp2 hybrid between boride atoms is the most important factors which can affect the transition temperature of MgB2. Population analysis clearly shows that electrons are transferred from Mg to B, as a result, the electron-phonon coupling in the layer of B is very strong.

规范保守赝势的计算结果表明，晶格常数与实验值误差在很小的范围内，分析了引起MgB2(001)面结构超导转变时电子浓度和偏态密度的变化情况，发现构成该超导体结构的成键有3种，着重从结构的电子浓度变化分析了其超导特性，六角蜂窝状结构中硼原子间相互作用为sp2杂化的共价键，镁原子和硼原子之间是离子键结合，镁原子层是金属键结合，镁原子的价电子部分转移到硼原子的pz轨道，部分电子为镁原子层共用。

The modification of address constants to compensate for a change in origin of a module, program, or control section.

修改一个模块、程序或控制节中的地址常数，以补偿它们起始地址的改变。

A historical region of southwest France between the Pyrenees and the Garonne River. The duchy of Aquitaine was joined with France after the marriage of Eleanor of Aquitaine to King Louis VII in1137, but its possession was disputed after her subsequent marriage to Henry II of England.

阿基坦法国西南部一个历史地区，位于比利牛斯山和加隆河之间，在1137年阿基坦的埃莉诺与国王路易斯七世结婚之后阿基坦公国加入法国，但当她再嫁英国亨利二世后，其归属权便受到争议

There are moments when I look at the smiling , happy faces of my expectant staff and wonder how they will cope when confronted by an outraged housemaster along with an unrepentant and recalcitrant bleached blond teenager in 18 years ' time .

有时候，我看着那些满怀期待的员工微笑，幸福的脸，想着当他们遇到一位愤怒的宿舍管理员和一位不知悔改，叛逆，而且将头发染成白色的18岁少年时，他们会如何处理。