极性效应

插入序列IS2的研究&Ⅱ.突变体的极性效应和DNA序列分析

The Study of Insertion Sequence IS 2 ⅱ . Polarity Effect of the Mutant and DNA Sequence Analysis

合成绝缘子直流污闪极性效应的研究

Polarity effect of DC contamination flashover of composite insulators

并认为，与其他两种PAN相比，CO2PAN等规立构规整度偏低的原因是由于所采用的CO2溶剂的非极性效应所致。

The reason for the isotacticity of CO_2PAN being lower than the other two kinds of PAN was probably due to the nonpolar property of solvent used .

本文对大电流区域交流半波中SF6旋转电弧的发展变化过程及零前500μs内的电弧形态作了较细致的观察，对电弧电压和速度的极性效应进行了分析。

Observations on the variation processes of high current rotating arc during half cycle and arc shapes within 500 μ s before current zero have been performed . The arc voltage and polarity effects of velocities have been discussed .

其直流击穿特性具有极性效应，正极性击穿电压低于负极性。

The positive breakdown voltage is below the negative under DC voltage .

低气压覆冰条件下直流绝缘子的极性效应

Effect of Polarity of DC Insulator Under Icing and Low Atmospheric Pressure Condition

混粉电火花加工中极性效应的研究

Study on Polarity Effects of Powder-mixed EDM

研究结果对有效地利用静电干燥和极性效应来合理设计静电干燥装置的结构具有重要意义。

For accelerating drying , the polarity characteristics should be considered in the drying equipment design .

极性效应σ~值计算

Calculation of the polar effects values

IS2左右插入后的极性效应不同。

The polarities were different when IS_2 was inserted from the left side or the right side .

作者认为影响聚合物等规度的因素主要是取代基的极性效应。

The tacticity of polymers is mainly influenced by the polarity of substituent group of vinyl monomer .

本文通过各电极结构在不同频率、电压情况下的电流波形分析，发现随着电压和频率的升高，极性效应减弱。

In this paper , We found the polarity effect reduced , as the he voltage and frequency increasing .

硫酸铁水合物催化乙酸与取代甲醇酯化反应的极性效应和空间效应的分离

Polar and Steric Effects of the Esterification of Acetic Acid with Substituted Methyl Alcohols under the Catalysis of Ferric Sulfate Hydrate

通过电火花修整试验研究了修整过程中的极性效应以及不同电参数对修整效率和整形精度的影响。

Polarity effects and the influences of different electrical parameters on wheel dressing efficiency and accuracy were studied in the experiments .

这种极性效应可用表面电荷积聚的影响来解释。

For the spacers with corrugated surge a slight influence of charge accumulation on the impulse flashover level can be found .

真实模型在全桥情况下的极性效应不明显，但是当存在空气间隙时，极性效应是存在的。

There are not polarity effects of the model and under heavy icing condition , whereas it is evident when the air gap exists .

结果表明，利用膜中乳胶粒子间微通道的极性效应可以有效地分离醇/水混合物中的醇，且优先脱醇效果明显，分离性能良好。

The results showed that the polarity effect of micro-channel between the particles in the membrane was used to separate the ethanol from ethanol-water mixtures .

通过试验研究首次得到：合成绝缘子闪络特性的极性效应不明显；

It is elicited by a large of tests that : the polarity effect of the composite insulators ' AC flashover characteristic is not obvious .

试验结果表明：覆冰状态对其闪络电压的极性效应有影响，且无论在正极性还是负极性，其平均冰闪电压随着海拔升高、覆冰量的增加以及覆冰水电导率的增加而降低。

Test results indicated that the average flashover voltage is reduced with the hoist of altitude , the increase of ice amount and the rise of pollutant .

正极性电弧金属阳极侧产生高电阻区所处位置的差异使得瓷和玻璃绝缘子串具有明显的极性效应；

The position difference of the high resistance district in method anode side results in that porcelain insulator cluster and glass insulator cluster have an evident effect of polarity ;

直流电压下，气固混合两相体的起晕电压存在极性效应，不同的占空比下存在不同的极性效应；

No matter what voltage type is used , corona onset voltage of air-solid mixture will always decrease as long as the solid medium 's volume ratio or permittivity increases .

硅橡胶合成绝缘子正被日益广泛地用于电力系统外绝缘领域，但迄今为止，对合成绝缘子直流污闪是否存在极性效应这一问题未作详细研究。

Silicone rubber composite insulators have been extensively accepted in the region of external insulation , but up to now , it is not clear yet whether their DC contamination flashovers have polarity effect .

仿真研究了极性效应对放电率和加工效率的影响，负极性加工时放电间隙比正极性小，其放电率也比正极性高。

The polarity effect on spark rate and machining efficiency is studied by simulation . The gap of negative machining is smaller than positive machining to achieve the same electric strength , and its spark rate is higher than positive machining .

从气体介质的电导与击穿、气体介质电火花加工的极性效应以及气体介质电火花加工电极材料的蚀除过程等三个方面阐述了气体介质电火花加工理论。

The theory of electrical discharge machining in gas is composed of three parts , which are the the conductance of gas medium , the polarity effect of electrical discharge machining in gas and the material removal process of electrical discharge machining .

其荧光光谱表现出明显的溶剂极性效应、浓度效应和温度效应，不同的环境条件下可发射芘单体的荧光、分子内电荷转移络合物的荧光及分子间电荷转移络合物的荧光。

Its fluorescence spectrum shows distinct solvent , concentration and temperature effects . Under different experimental conditions , the fluorescence may emit from pyrenyl monomer , intramolecular charge transfer complex ( Intra CT ) and intermolecular charge transfer complex ( Inter CT ) .

并研究了等能量脉冲线切割加工具有提高脉冲利用率、提高单脉冲的蚀除量、强化极性效应、延长电极丝的使用寿命等特点。

Another , using the isopulse generator , characteristic of WEDM was studied . The WEDM with equal pulse 's energy has the advantages of improving rate of use pulse , increasing quantity eroded of pulse , strengthening polarity effect and extending life of wire electrode .

由于PGA纤维能够平行排列成束，有极性诱导效应，且细胞悬液易于渗透，有利于成肌干细胞的体外生长和极性分化。

As the PGA fibers arranged in parallel bundles and made the cells suspension permeated well , it is beneficial to growth and polarity differentiation of skeletal muscle stem cells .

一种新型的有机电双稳薄膜及其极性记忆效应

A New Organic Bistable Film and Its Polarized Memory Effect

电解质种类和浓度影响磷酸根解吸的机理研究高分子阳离子导体的极性基效应

Effect of ionic strength and cation on phosphate desorption

高分子阳离子导体的极性基效应

Effect of polar group in cation-conducting polymer