介

The results show that the dielectric constant and dielectric loss of ALT composite ceramics decrease with the increasing frequency.

结果表明：随着频率的增加，不同Al2O3含量的ALT陶瓷复合材料的介电常数和介电损耗均降低，但降低的幅度不同。

So it has important meaning to factual work to have a thorough understanding of the interrelated concepts of dielectric constant.

首先介绍了介质和导体、半导体的区别，然后解释了介电常数的基本概念，并给出相对介电常数的另一种导出定义。

It may decide scope of dielectric constant and microwave loss in a certain extent.

其中相结构影响最为显著，它在很大程度上决定了介电常数、温度系数的范围和介电损耗的数量级。

A small quantity of Ca can increase the dielectric constant and decrease the dielectric loss at the room temperature.

少量的Ca的引入还会提高室温附近的介电常数，降低介电损耗。

This paper firstly introduced the dielectric and its polarization mechanism. The concept and present situation of the dielectric and high dielectric materials as well as the CaCu3Ti4O12 materials were introduced in this thesis.

本文首先介绍了电介质及其极化机制、高介电材料的概念、高介电材料研究背景和目前CaCu3Ti4O12材料的研究情况。

A physical model consists of dielectric polarization at high field and carrier injection at low field and high temperature was proposed.

本论文并讨论a-SiC介电质和其它低介电常数材料如：CDO之高温氧化现象及其晶圆回收应用。

Based on the theory of medium polarization, the dielectric properties of the mixture of oil and water researched, it is found that the best frequency for measuring dielectric constant of the oil-water mixture ranges between 10〓—— 10〓Hz considering medium polarization, EM wave modes, circuit simplification and so on.

本文的主要研究内容和研究成果如下：(1)根据介质极化理论，通过对油水混合介质的介电特性的研究，结合介质极化、电磁波的模式以及简化实现电路等因素，提出了测量油水混合介质介电常数的最佳工作频率在10〓～10〓Hz之间。

It was shown that 1%Eu-PZT films have the highest Rayleigh constant, which indicates the minimal interaction of defect-domain walls and high contributions to dielectric and polarization. The high mobility of domain walls, combined with the obvious improved crystallization of 1%Eu-PZT results in the increase of dielectric constant and remanent polarization.

结果表明，1％Eu-PZT薄膜的瑞利系数最大，缺陷与畴壁之间的相互作用最小，畴壁运动对介电常数和极化强度的贡献最大，加之薄膜明显改善的结晶特性，使1％Eu-PZT呈现较高的介电常数和剩余极化强度。

Its dielectric property and effect of the annealing temperature on the property were also studied and discussed in this paper.

文中同时对薄膜的介电性质进行研究，并讨论了退火温度对薄膜介电性质的影响。

The adding of La and Sr will lead to an increase in the content of the rhombohedral phase and in the degree of the phase diffuseness and the frequency dispersion.

研究了组成、掺杂和工艺等因素对压电和介电性能的影响，首次采用烧结后的退火工艺得到了一系列具有良好压电和介电性能的弛豫铁电陶瓷体系。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。