查询词典 varistors

The degradation characteristics of ZnO-glass varistors have it's own features. For the first time, degradation phenomena of varistors under direct biasing, alternative field and pulse current are examined respectively in this thesis.

ZnO-玻璃系压敏电阻的老化有其自身的特点，论文首先分析了压敏电阻在直流、交流和脉冲电流作用下的老化实验现象，在此基础上，分析了各种条件下的老化机制。

The four varistors form the Wheatstone full bridge. Two lateral sides of cantilever and overload protection structure are fabricated using DRIE technology. A novel overload protection curvature is designed to be similar to the cantilever bending shape which is bearing the greatest acceleration. This design increases the overload protection and improves the vibration damping of accelerometer to the critical damping.

悬臂梁两侧面和过载保护曲面采用DRIE技术加工，过载保护曲面设计成近似于冲击加速度传感器承受最大加速度时悬臂梁弯曲曲面的形状，一方面提高了悬臂梁过载保护能力，另一方面可以调节加速度传感器的工作阻尼至临界阻尼，有效提高了加速度传感器的工作频率带宽。

Adding a certain amount of monovalent and trivalent cations is essential for improving ZnO varistors's characteristics.

一价离子、三价离子以及其它氧化物掺杂改性对于获得高性能压敏电阻也十分关键。

The research and development of high potential gradient zinc oxide varistors including the chemical compositions,microstructure and processing are summarized in this paper.

从材料组成、显微结构控制和制备工艺等方面综述了国内外高电位梯度 ZnO压敏电阻片的研究进展，并展望了提高ZnO压敏电阻片电位梯度和通流容量的途径。

In this thesis, three major achievements were made in theoretical study: conditions and rules for preparing nano-powders by chemical precipitation are analyzed from the point of view of thermodynamics and kinetics, the principle, standards and experimental method for the aqueous dispersion of nano-scaled metal oxide powders were proposed and verified, mathematical model of nano-filming addition of dopants by chemical coprecipitation was established. In experimental research, nm-ZnO, nm-Bi〓O〓, nm-Co〓O〓 and nm-MnO powder with spherical shape, narrow particle size distribution and small particle size were prepared successfully, highly stable and dispersive aqueous suspensoid of nm-ZnO, nm-TiO〓, nm-Co〓O〓 and nm-MnO powder were prepared successfully and surface modification on these nano-powders was also achieved, 0-3 nanocomposite ZnO varistors with nm-ZnO, nm-TiO〓and nm-MnO respectively were prepared successfully by conventional mechanical attrition, and exhibited much better electrical properties than those of conventional varistors.

综上所述，本文在理论研究方面取得了三项成果：（1）从热力学和动力学角度推导并分析了液相化学沉淀法制备纳米粉体的反应条件和规律，（2）提出了纳米氧化物的水分散体系的设计原理、规范和通用实验步骤，（3）提出了共沉淀的数学模型和计算方法；在实验方面所取得的成果有：（1）成功制备了粒度小、分布窄、形貌对称的纳米氧化锌、纳米氧化铋、纳米氧化钴和纳米氧化亚锰，（2）成功地制备了纳米氧化锌、纳米二氧化钛、纳米氧化钴和纳米氧化锰的高稳定分散悬浮液并实现了干粉体的表面改性，（3）成功地进行了纳米氧化锌、纳米二氧化钛和纳米氧化锰对压敏电阻的0—3复合掺杂实验，试样性能远优于常规压敏电阻，为实现压敏电阻的高能高压化提供了新的方法和思路。

Temperature and, unlike the zener diode, the multilayer varistors have the added advantage that, when operated up to

与齐纳二极管不同，叠层片式压敏电阻器具有低漏电流特性，在最高工作温度下，漏电流不超过500μA。

The influence of thickness d of ZnO varistors on the residual voltage ratio K \-r has been experimentally studied.It is showed that K \-r also has dimensioned effect. The results show that there is a residual voltage ratio K \-r decreases propor tonally with E \- 1mA ,and increase μ as grain mean size.

实验研究了厚度d 对ZnO压敏电阻片残压比Kr 的影响规律，表明残压比同样存在几何效应；实验还表明残压比Kr 随电位梯度E1m A成反比例下降，随平均晶粒尺寸μ的增大而增大；找到了一个综合微观结构参数平均晶粒尺寸μ和晶粒尺寸方差σ2 的乘积（σ2μ），能较好地反映电性能与微观结构参数的关系。

In ZnO varistors with antimony oxide, zinc antimony spinel produced during sintering process results a higher non-linearity and stability. The non ohmic property can also be enhanced by adding cobalt oxide or magnate oxide, but their effects are different, Co is more effective compared with Mn.

材料中添加Sb〓O〓时，烧结过程中生成的〓尖晶石相大大提高了材料的非线性和工作稳定性，Co〓O〓和MnO〓的加入有效增强了压敏电阻的非线性特性，而Co〓增强非线性特性的效果则更加显著。

ZnO Varistors have extremely nonlinear current-voltage characteristics and therefore are widely used in electronic circuits and el...

ZnO压敏电阻具有优异的非线性特性，它在电子和电力系统中得到了广泛的应用。

In this paper, research works on the improvement of the voltage gradient and energy-handling capability of the ZnO varistors are reviewed. The main methods to improve varistor voltage gradient (4.0kV/cm) and energy-handling capability (300J/cm3) of the ZnO varistors are presented.

综述分析了国内外用于交直流系统避雷器的高电位梯度、大能量吸收能力的新型ZnO压敏电阻片的研究开发和应用进展，总结了提高ZnO压敏电阻片电位梯度(达4.0kV/cm)和能量吸收能力(达300J/cm3)的主要途径。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。