介电常数

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。

Ferroelectric material is a kind of functional material, besides its ferroelectricity, it has many special properties such as high dielectric permittivity, piezoelectricity, pyroelectricity, electrooptics and so on, and can be utilized in various devices such as High-K material in capacitors, acoustic wave devices, piezoelectric sensors, MEMs, thermal detector and electroopic devices. Therefore research and development effort in ferroelectric materials and devices have now hit a feverish pitch.

铁电材料是一种功能材料，它不仅具备铁电特性，而且具有高介电常数、压电效应、热释电效应、电光效应等特殊性质，可以应用于High-K介质材料、声学探测器、压电传感器件、微机械系统领域、热电探测器、铁电光阀显示器等等；因此，铁电体以其独特的物理、化学性质越来越引起人们对其技术应用的重视。

Indicate that IBLC theory can explain the variety of parameter perfectly.

表明IBLC理论能较好的解释巨介电响应里的各个参数（比如介电常数，损耗因子）的变化。

And the permittivity and dissipation factor on Si substrate were 342 and 0.05 respectively.

在低阻Si上制备的BST薄膜介电常数为342，介电损耗为0.05。

The thesis presents the measurement principle and its disturbance factors, as well as the method to obtain the complex permittivity of pressboard with a lumped circuit model.

论文详尽介绍了介电测量技术的原理及影响因素，并提出了利用集总电路模型求被测绝缘纸板的复介电常数的方法。

With increasing the ceramic volume fraction,d_(33) increased until it reaches a saturation value the and relative permittivity constant rose linear.

压电常数d_(33)随着纤维体积含量的增加迅速增大，最后趋于饱和，介电常数随着纤维体积含量的增加几乎呈线性增加。

We got the simple and high accurate eigenvalue equations and cutoff frequency formulae of all propagation modes. Second, to the optical fiber with homogeneous cladding, we defined the "permittivity ratio", and we got the simple and high accurate connection of cutoff frequency to the ratio. Third, to the fiber with inhomogeneous cladding, we analyzed the dispersive and power-frequency characteristics.

第二，对于具有各向同性包层的弱渐变光纤，引入了介电比，找到了精度高且形式简洁的截止频率对折射率参数的依赖关系；第三，对于具有各向异性包层的弱渐变光纤，首次通过包层的轴向与横向的介电常数比分析了该类光纤的色散和功率特性。

Incipient ferroelectrics or quantum paraelectrics constitutes a very unique subject of current interest due to its high value of dielectric constant , low dielectric losses and high degree of tenability by the external electric field and temperature .

等由于其高介电常数，低介电损耗，对外场和温度高度的可调协性等独特的性质和应用价值一直是一类人们广泛研究的晶体材料。

However, mobility degradation and threshold voltage instability are the mainly concern.

然而，在高介电常数的介电质中所产生的迁移率衰减与临界电压的不稳定都是其主要的存在问题。

It is found thatthe fractal dimension D=1.25 corresponds to the lowest criticalcoupling constant αc=1.9,D=1.73 corresponds to the highest criticalratio of dielectric constants ηc=0.163,and when D≤1.145 bipolaronscan not exist at any rate.In chap,4,we will propose a novelapproach to the calculation of the exciton ground-state energy for thestrong-coupling case.Different from all previous methods,the wavefunction of the phonon part is assumed to take a form related to thewave function of the relative motion.We obtain the exciton energy bysolving the derived integrodifferential equation rather than select ahydrogen-like form to minimize the energy expectation.

结果发现，分数维的维数D＝1.25对应最小的临界的电-声耦合常数(αo＝1.9)，D＝1.73对应最大的临界的介电常数比(ηc＝0.163)，当分数维的维数D≤1.145时，双极化子无论如何也不可能存在，在第四章中，我们将提出一种新颖的变分方法来计算强耦合的激子-声子系统的基态能，不同于以前所有的方法，我们取声子的波函数与相对运动波函数有关的形式，而不是假定一个固定的关于相对运动坐标r的函数形式，得到相对运动波函数所满足的非线性的微分积分方程，我们数值求解这个微分积分方程得到系统基态能，而不是选择一个类氢原子的波函数变分使得能量的期待值最小。

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。