电极化的

Using DC and AC poling methods, three groups of polarized PZT/P 70/30composites have been prepared by poling only the ceramic phase(1), both ceramic and polymerphases in the same(2) and opposite(3) directions. Piezoelectric coefficients of group 1 compositesincrease as the PZT content increasing, while for group 2 composites, the piezoelectric coefficientschange the sign with increasing PZT content because piezoelectricity of copolymer is increasinglycompensated by that of PZT, and PZT content for zero-〓 isn't that for zero-〓. The experimentdata of both group 1 and 2 composites agree well with EMT-Shin model.

对复合材料的压电性能：只极化PZT粒子相的复合材料的压电系数随陶瓷分数的增大而增大，PZT粒子相与共聚物基体同向极化的复合材料的压电系数由于两相效应的部分抵消，随陶瓷含量的增大，发生符号的改变，且〓和〓零点不重合，它们与EMT-Shin模型都符合较好；而两相反向极化的复合材料的压电系数由于AC反向极化会导致陶瓷相极化程度的下降，导致实验值和理论预期偏差较大，尤其在PZT粒子高含量区。

P. P. Raevski〓, and pointed that this polarization at grain boundary between WO〓 monoclinic and triclinic phases causes a modification to Schottky barrier is origin of nonlinear electrical characteristic of tungsten oxide polycrystalline ceramics.

Raevski〓的铁电半导体非线性电输运理论模型的框架内，我们重点考虑了铁电极化对WO〓陶瓷非线性电输运特性的影响，指出由于三斜和单斜晶相的共存，在其晶界处存在的电极化可以对Schottky势垒产生一种修正，是导致出现压敏现象的一个重要因素。

Mathematics model of dielectric under uniform electric field is built up, and total current is separated into three parts such as conductive current, instantaneous current and relaxation polarization current, then polarization and depolarization of linear and non-linear dielectric are simulated under step excitation, the results show that nonlinearity of non-linear conductivity is reflected by measuring surface potential attenuation during the process of self-discharge of non-linear dielectric.

论文首先对处于均匀电场下的电介质进行电路建模，把电介质的总电流分为电导电流、位移极化电流和松弛极化电流三部分来分析，然后以此为基础利用Matlab软件中的Simulink平台对直流阶跃激励下线性和非线性绝缘介质的极化和退极化过程进行了仿真，结果表明可以通过测试非线性绝缘介质自放电过程的表面电位衰减来反映其非线性电导的非线性程度信息。

A series of experiments were done to substantiate the feasibility of the different piezoelectric cochlea implants in vitro and in vivo . The unpoled ceramic had no piezoelectric characteristic and no ability to decrease the threshold, while the poled ceramic had obvious piezoelectric effect to recover the hearing. Based on these results, it can be affirmed that the piezoelectric cochlea implant can activate the nerve and decrease the threshold.

本研究通过未极化与极化的高灵敏性压电陶瓷的对比，从体外模拟实验中的声电响应曲线和动物体内植入实验的结果中得到：未极化的压电陶瓷没有压电响应，而极化后的压电陶瓷能够将声音信号转化为电信号，证实了压电陶瓷的压电特性的确可以刺激动物的听神经，从而降低听阈阈值。

A series of experiments were done to substantiate the feasibility of the different piezoelectric cochlea implants in vitro and in vivo. The unpoled ceramic had no piezoelectric characteristic and no ability to decrease the threshold, while the poled ceramic had obvious piezoelectric effect to rec

本研究通过未极化与极化的高灵敏性压电陶瓷的对比，从体外模拟实验中的声电响应曲线和动物体内植入实验的结果中得到：未极化的压电陶瓷没有压电响应，而极化后的压电陶瓷能够将声音信号转化为电信号，证实了压电陶瓷的压电特性的确可以刺激动物的听神经，从而降低听阈阈值。

Specific subjects Ab initio and Density functional theory calculations of electric polarizability and hyperpolarizability, intermolecular forces, aromaticity, molecular design, electric properties of solvated molecules, NLO materials, Raman intensisties, polarizability of metal and semiconductor clusters, relativistic effects on electric properties, and more.

具体科目和从头计算密度电极化和超极化率，分子间作用力，芳香性，分子设计，溶剂化分子，非线性光学材料，拉曼intensisties，金属和半导体产业集群，对电性能的相对论效应极化电性质的密度泛函理论计算，更。

Dynamics theory of ferroelectric polarons, which was developed from the shielding theory of ferroelectricity, is used to explain the polarization switch of ferroelectricity.

在铁电屏蔽理论的基础上发展铁电极化子动力学理论，用来解释铁电体的极化反转现象。

Spin injection make the spin density of the polarons different at the different position in the organic semiconductor.

计算结果表明，极化子电导的自旋相关性是自旋注入引起的，和电流的自旋极化率密切相关；在自旋注入发生后，有机半导体内不同位置上极化子自旋态密度不同，由此产生的极化子电导也不相同，极化子电导是位置的函数。

The reduction in switchable polarization of ferroelectric thin film is a major problem in ferroelectric mem...

铁电薄膜开关过程中可反转的极化随开关次数而降低，即铁电极化疲劳，这是铁电存储器应用中遇到的一个大问题。

The reduction in switchable polarization of ferroelectric thin film is a major problem in ferroelectric memories.

铁电薄膜开关过程中可反转的极化随开关次数而降低，即铁电极化疲劳，这是铁电存储器应用中遇到的一个大问题。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。