Synthesis of a Cyclic Dimer of Dibenzo-18-crown-6 Containing Rigid 4,4 ′-Bis ( aminomethyl) biphenyl Spacer

Preparation of α-Methylstyrene Cyclic Dimer

α-甲基苯乙烯环二聚体的研制

Study on Synthesis of α-methylstyrene cyclic dimer

阳离子交换树脂催化合成α-甲基苯乙烯环二聚体的研究

It chooses the standardized dimensionless quantity method in this conversion. ( 4) The dissertation constructs an index evaluation model system of the three-dimension financial competitiveness based on the index system of the three-dimension financial competitiveness, which includes synthetic model, matrix model and cubic model.

在设计的三维财务竞争力指数体系基础上，构建了三维财务竞争力指数评价的模型体系，包括综合模型、矩阵模型、立方模型。

Derived from the Newton law and Hertz equation, a dimensionless quantity, called the relative erosion strength, is found to be a constant during the impacting of an abrasive particle on ductile materials.

从牛顿定律和赫兹方程导出一个称为量钢一的量的相对冲蚀强度，发现在磨拉冲击韧度材料过程中保持不变。

The authors suggest a new dimensionless quantity N and try to interpret its physical meaning and predict a "neutral stability curve" in Ma-N map.

文中提出新的无因次量N并解释了其物理意义，还指出Ma-N图上存在一条中性稳定曲线。

Introducing the dimensionless quantity Mo and Eo investigate the trend of break time.

引入无因次量Mo数和Eo数，研究了液膜破裂时间的变化趋势。

Dimensionless Quantity Method, Natural Unit Method, Characteristic Quantity

无量纲化自然单位法特征量

The numerical results of average dimensionless equivalent conduction coefficient Keq obtained in this paper agree well with previous experimental results.

在相同条件下计算结果和实验结果符合很好。

The use of lower dimensionless integrated coefficient and moderate dimensionless support damping coefficient and/ or higher dimensionless rotor external damping coefficient can decrease the unstable region.

采用较低的无量纲综合系数和适当的无量纲支承阻尼系数和／或较大的无量纲转子外阻尼系数可以缩小失稳区；

This paper describes the methods of fan testing and making fan property curve by dimensionless characteristic coefficient for the cooling fan of air-cooled engines.

论述了风冷发动机冷却风扇的试验法和用无因次特性系数法制取风扇特性曲线的方法。

The evolution of 2/ 1 mode relative to the dimensionless viscous coefficient and the distribution of current density is given.

结果给出了2/1模的演变过程对无量纲粘滞系数的依赖关系和电流密度的分布。

A dimensionless coefficient C_b which is dependent on R/ B and bedload friction coefficient is defined This model verifies theoretically the maximal values of rate of bend migration as R/ B is value between 2 and 4.

模式中引入了一个与R/B和床沙摩阻系数有关的无量纲系数C b，从理论上证明了当弯道R/B介于2～4之间时，蠕动速率取最大值。

Dimensionless coefficient method of designing the welding section of axial pressure component with H shape

焊接H形轴压构件截面设计的无量纲系数法

The numerical results show that mass ratio, dimensionless relaxation coefficient and dimensionless elastic constant ratio all have influence on the dynamic characteristics and stability of the viscoelastic pipe conveying fluid.

计算结果表明，质量比、无量纲松弛系数及无量纲弹性常数比对输流管道的动力特性均有影响。

On the other side, the time of gas breakthrough decreases, the oxygen content of the breakthrough gas decreases and the displacement efficiency at gas breakthrough increases with the increase of the temperature when the dimensionless pressure is constant.

无因次压力一定时，随着温度的升高，气体突破时间缩短，突破气体含氧量降低，气体突破时驱油效率增加。

CASE damping constant Jc is an important dimensionless experienced constant during high strain dynamic pile testing.

CASE阻尼系数（Jc）是CASE法高应变动力试桩中一个重要的无量纲经验系数。

Describing the power-split strategy of powertrain and the influence of fuel consumption by introducing the dimensionless separation factor.

通过引入无量纲的分离因子，描述整车动力总成的能量分配策略及其对油耗的影响。

Substance converting heat into electric energy under certain range of temperature is called thermoelectric material, of which converting efficiency is mainly determined by its own intrinsic properties and evaluated by ZT of dimensionless factor.

在一定的温差下，可将热能转换为电能的材料称为温差电材料。其热电转换效率的大小主要取决于材料的性能，通常用无量纲因子ZT来表示。

Using the establishment gap axis fatigue life model, through the computation, the relational expression between the gap radius, the gap open angle, the gap depth and the dimensionless factor has been established.

应用建立的缺口轴疲劳寿命模型，通过计算，得到了缺口半径、缺口张开角和缺口深度与无量纲因子的关系表达式。

Furthermore, desulfurization efficiency model of concentrated alkali dual-alkali FGD system with a dimensionless factor ε was proposed, which can be used to guide the design and optimize the operations.

此外，提出了用一个综合影响因子ε表达的浓碱双碱法脱硫效率模型，该模型可用于工艺参数优化、指导工艺设计。