极性

The influence of impulse voltage waveshape on particle-initiated breakdown voltage of a GIS system in SF6 and SF6/Air mixtures is reported. The results are compared with the characteristics of air gaps. For the SF6 gaps, breakdown voltage depends on wave-front duration but almost independs on wavetail duration. For the gaps in SF6/Air mixtures, the influence of impulse waveshape also depends on SF6 contents and electrical field non-uniformity

作者研究比较了正极性冲击电压波形对SF_6、空气、SF_6/空气的 GIS 电极装置由固定导电微粒引发的击穿电压的影响，结果表明：SF_6间隙的击穿电压受冲击电压波前时间长短的影响较大，而与波长的关系不大，当采用SF_6/空气混合气体时，则这种影响随SF_6含量增大而愈明显，并与电场不均匀程度有关。

This also means that the polarity of the voltages must be correct for the type of transistor.

这也说明电压极性必须根据晶体管的类型来改变。

At the same time,this thesis also determined the in vitro and in vivo antioxidant activity of different fractions,discussed the source of antioxidants in vinegar and compared the antioxidant activitydifference of different kinds of vinegars.

本论文在系统研究食醋功能的相关研究文献和现代自由基医学的有关氧化损伤与疾病关系的理论和实验基础上，以自由基医学理论为指导，应用现代生物技术研究了食醋不同极性、不同分子量分离组分的抗氧化活性，确定较高自由基清除活性组分；对食醋不同组分的体外抗氧化活性进行综合评价；对食醋的体内抗氧化性进行研究；并对食醋中抗氧化性成分的来源、不同品种食醋抗氧化性差异进行了探讨。

Building time and jitter of the Marx generator are mainly depend on work state of spark gap switch during operating. Meanwhile they are related to amplitude and polarity of trigging voltage.

Marx发生器建立时间及抖动与Marx发生器中球隙开关的工作状态有关，同时与开关的触发电压幅值及极性有关。

In highly polar semiconductors like GaAs and ZnSe, the electrons will lose their excess energy and thermalize with the lattice predominantly by emission of LO phonons.

在像GaAs和ZnSe这样的极性半导体中，电子主要通过释放纵波光学声子失去多余的能量，与晶格达到热平衡。

But SPME was suitable to extract the substances such as terpenes,aldehyde ketones and small polar hydrocarbon compound with the low boiling point.

而SPME萃取的物质主要是低沸点的萜类、醛酮类和小极性的烃类。

Secondly, the experimental research advances of cyclopeptide nanotubes using as the templets to produce biosensors by synthesis with functional nanomaterials such as electronic, optical and magnetic ones.

首先介绍了带合适疏水性侧链的环肽纳米管在模拟生物跨膜离子通道方面的实验和理论研究进展，重点论及环肽纳米管的结构、极性和侧链的疏水性等对离子通道传输行为的影响以及分子动力学模拟研究水通道的进展。

Secondly, the experimental research advances of cyclopeptide nanotubes using as the templets to produce biologic sensors by synthesis with functional nanomaterials such as electronic, optical and magnetic ones.

进而介绍了环肽纳米管用作生物传感器模板，与功能性纳米材料合成制备生物传感器的实验研究进展，接着介绍了环肽纳米管作为药物或药物载体潜在的应用前景，特别是在某些抗菌和抗感染药物开发设计中的应用以及环肽在不同极性的环境中自组装过程微观机制的MD模拟研究进展，最后介绍了环肽纳米管作为模板，制备磁性、电性纳米材料方面的实验和理论研究进展。

B Somatic embryos had no obvious suspensors.

体细胞胚具明显的极性。

Examples of suitable polar volatile liquid are amines ethers especially lower alkyl ethers organic acids esters ketones glycols alcohols amides ureas sulphoxides sulphones and water.

合适的极性挥发性液体的例子有胺，醚，尤其是低级烷基醚，有机酸，酯类，酮类，乙二醇，乙醇，酰胺，尿素，sulphoxides，砜和水。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。