介电常数

High-frequency and high power electronic or microwave devices, because of their excellent properties such as wide band gap, high electron saturation drift velocity, low dielectric constant, high thermal conductivity, good chemical and thermal stability, and so on.

同时由于GaN基材料具有电子漂移饱和速度高、介电常数小、导热性能好、化学和热稳定性好等特点，也非常适合于制作高温、高频及大功率电子器件。

The enhancement of conductivity is due to the local concentration of equipotential lines when conductive current is dominant at high frequencies.

等效介电常数的增强是由于等势线在传导电流为主导时在局部汇集引起的；等效电导率的增强是由于等势线在位移电流为主导时在局部汇集引起的。

This dissertation aims to: improvement in regularity of ladderlike polysiloxane through strong H-bonding template and"half-water-hydrolysis"methods; synthesis of several functional polysilsequioxane with ethoxyl, hydro and aminopropyl groups respectively; and the preparation of nanoporous film with good mechanic properties from ladderlike functional polysilsesquioxane with intermolecular porogen via micro-phase separation process.

本论文旨在利用强氢键模板作用和"半水水解-脱氯化氢缩聚"的改进方法，提高反应性的梯形聚硅氧烷的规整度；合成乙氧基封端、含氢基和氨丙基的几种功能性梯形聚硅氧烷；以及探索利用含分子内成孔剂的梯形聚倍半硅氧烷通过微相分离制备低介电常数二氧化硅纳米微孔膜。

Using ethylamine as a preswelling agent, a detailed study of the effect of solvent, amount of amine added, reaction time has been carried out. Among these the dielectric constant of the solvent has been found to be the most important factor.

以乙胺为预撑剂，详细考察了溶剂、胺的加入量、反应时间等因素的影响，发现溶剂的介电常数是影响这类晶体剥离和嵌入的最重要的因素。

After rolling processing NOMEX the product ability 18~40KV/mm short-time voltage field intensity, does not need with the varnish and the resin makes further processing; Because the NOMEX product has the low coefficient of dielectrical loss, thus causes of electric field distribution between the reason and the cooling medium is evener.

经过压光处理的NOMEX产品能耐18~40KV/mm的短时电压场强，无需用清漆及树脂作进一步的处理；由於NOMEX产品具有低的介电常数，因而使得绝缘和冷却介质间的电场分布更为均匀。

Using a new material with a dielectric constant greater than that of SiO2 to replace SiO2 film as gate dielectrics is an indispensable task.

因此利用高介电常数材料取代现今的二氧化矽成为不可避免的趋势。

PPSQ; cure; spin coating; Gaussian curve fitting; molecular template; low dielectric constant

PPSQ；固化；高斯拟合；旋涂；分子模板法；低介电常数

The results show that in the course of gelation, a certain amount of coupling agent joining the n...

结果表明，在凝胶化过程中，适量的偶联剂不仅起着交联剂的作用，而且能改善复合材料的粒子聚集态；而复合材料的介电常数远远低于BST55陶瓷，且随着PMMA含量的增加而有所降低。

With the increasing of metal wire radius, the group velocity and attenuation amplitude decrease.

采用高介电常数的金属可提高金属丝波导的传输性能。

Why the value of imaginary part of the dielectric function is not zero at E=0?

同理，为什么介电常数虚部在0eV处也不是0呢？

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。