STUDIES ON THE WITTIG REACTION(ⅰ) The Stereochemistry of 1, 3,-diene Synthesis

The electrical properties of, and in the resistivity, dielectric constant are control at the proper level.

电性能, 又如电阻率 、 介电常数等均应控制在适当水平.

To satisfy these requirements, high dielectric constant composites attract more and more attentions.

这就要求人们不断研究和制备高介电常数复合材料.

The dielectric constant and thermal expansion coefficient of samples increase with the increase of ZnO content.

样品的介电常数和膨胀系数随着氧化锌的增加而增加.

Dielectric constant of materials depended on dipole polarization, electron polarization and atom polarization inner materials.

介电常数取决于改性材料内部的偶极极化 、 电子极化和原子极化.

Computer to use shielded cable, use a small dielectric constant, high-pressure polyethylene for insulation.

电子计算机用屏蔽电缆, 选用介电常数小的高压聚乙烯作绝缘.

With the increasing content of silica, the absorption reduced and the dielectric constant is not variable.

随着二氧化硅含量的增加, 薄膜的吸水率降低,介电常数基本不变.

Excessive sintering aids could lead to glass state material separating out and dielectric constant decreasing.

过量的助烧剂会导致玻璃态物质析出并使介电常数减小.

PCIP can only exist dielectric with smaller state dielectric constant ε0.

界面极化子只能存在于静态介电常数较小的一侧.

Considering these difficulties, the author develops a new type dielectric loss tangent tester for capacitive-type equipment.

本文针对以上技术难点, 研制了一种新型 电容型 电气设备介质损耗测试仪.

PbO deficiency only affected dielectric loss very weakly.

而铅欠缺对介电损耗影响很小.

And proper content of nano-Al 2 O 3 could improve dielectric breakdown strength of these composites.

适量纳米Al2O3可以提高材料的电击穿强度.

The short-pulsed liquid dielectric breakdown characteristic is the basis of the application of pulse-power technique.

快脉冲下液体绝缘介质击穿特性是脉冲功率技术应用的基础.

Properties of dielectric breakdown of 2 2 piezoelectric composites in series were studied.

研究了串联2-2型复合材料的介电击穿特性.

The accuracy of dielectric strength testing result if vital to ensure the safety of electronic products.

保持抗电强度试验结果的准确性对于确保电子产品的安全至关重要.

The electrical characteristics of insulation materials mainly include electric conductivity, dielectric property and stress of insulation.

绝缘材料的电气性能,主要表现在电场作用下材料的导电性能 、 介电性能及绝缘强度.

Applications for Measuring Voltage from High Resistance Sources : Capacitor dielectric absorption and electrochemical measurements.

2各种高阻源电压测量的应用: 电容器的介电吸收和电化学测量等.

Figure 4-2 illustrates the basic circuit that uses an electrometer to determine dielectric absorption.

图 4-2 说明使用静电计确定介电吸收的基本电路.

Dielectric absorption is calculated from the residual voltage value as described in the previous paragraph.

按照前一节介绍的方法,从剩余电压的数值就能计算出介电吸收.

The results showed that the decoction increased the stability of WBC, increased the phagocytic and digestive power of depressed macrophages and enhanced the recovery of T-cell immunity from depression.

结果表明，本方剂对小鼠白细胞（WBC）有稳定作用，能增强受抑制巨噬细胞（Mφ）的吞噬能力和增进Mφ对吞噬物的消化能力，并可促进受抑制T细胞免疫功能恢复。

Papain of a higher digestive power may be reduced to the official standard by admixture with papain of lower activity, lactose, or other suitable diluents.

具有较高的消化能力的木瓜蛋白酶也许可以通过掺加低活力的木瓜蛋白酶，乳糖或者其他合适的填充物来降低消化能力以达到官方的标准。