稳定电阻

CuI is a P-type semiconductor material with 3.2eV bandwidth and stable performance in chemistry and physics. Its resistivity can be changed with concentration, and CuI film is transparent for visible band of light.

CuI是一种高带隙宽度的P型半导体材料，带宽为3.2ev，物理化学性质稳定，制备成本低廉，电阻率可随浓度改变，在可见光范围内透明等优点。

In the design of the power supply, the main circuit topology frame uses half-bridge series resonant switching and parallel load connection, in which, an IGBT is adopted as the power switches, and features high operation frequency, high output power and fast response. In addition, the IGBT in the switch mode power supply has no hard turn-on or turn –off situation in transition, thus the disturbance to the power system is avoided.

相应的激光电源采用半桥软开关技术，串联谐振并联输出，IGBT 为主控制元件，实现了高频工作、高功率多路输出，响应快速；脉冲模式工作时避免了开关管的硬开关，减小了高次谐波对电网的干扰；无需镇流电阻也可实现气体稳定放电等特性。

In the design of the power supply, the main circuit topology frame uses full-bridge series resonant switching and parallel load connection, in which, four MOSFETs are adopted as the power switches, and by four pulses which UC3879 produces, high frequency operation and fast response are realized. In addition, the MOSFET in the switching power supply has no hard turn-on or turn-off situation in transition, thus the disturbance to the power system is avoided. Especially,by the use of high frequency transformer, PQ50/50, the switching power system can provide the steady discharge current without any amperite.

此开关电源采用全桥软开关技术、串联谐振并联输出，四个MOSFET管为主控制开关元件，通过脉冲产生电路UC3879产生的四路相关脉冲实现了高频交替开关，同时能快速响应输出的各种变化；避免了开关管的硬开关，提高了转换效率，另外通过采用高频变压器PQ50/50隔离了原副边，减小了高次谐波对电网干扰；无需镇流电阻也可实现气体稳定放电。

During the process of calculating the stable temperature rise of an electromagnet, the power in the cold state can be used as a heat source if electrical resistance changes of the coil from the cold state to the stable state have few effects on the power.

在计算电磁铁的稳态温升时，若线圈电阻从冷态到稳定发热时的变化对发热功率影响不大，可将冷态时的发热功率当作热源进行计算，应用稳态热路法计算线圈的稳态温升。

The results show that, 3D Dufort-Frankel method is unconditional stable; the diffusion velocity of transient field is related to sample interval and resistivity contrast.

结果表明：三维DuFort-Frankel差分算法是无条件稳定的，瞬变电磁场的扩散速度与采样时间间隔和电阻率差异有关。

Lead dioxide is characterized by low electrical resistivity, stable chemical property, anticorrosion, high electric conductivity, etc, and applied in a variety of electrolysis production of organic and inorganic substance, sewage disposal and the production of superpure water widely, and so is attached importanced to by interrelated scientists.

随着电化学工业的不断发展，传统的阳极材料越来越表现出其局限性，二氧化铅电极具有电阻率低、化学性质稳定、耐蚀性好、导电性好等特性，广泛应用于各类有机物和无机物的电解生产、污水处理及高纯水制备过程中，受到相关科学家的重视。

In chapter three, various theories and experience on the dispersion of nano-powders proposed by former researchers were generalized and reviewed. Technical standards and experimental process for determining technological parameters were suggested for the dispersion of nano-scaled metal oxides in aqueous medium according to their surface wettability, surface charge, the dependence of surface charge on pH and the compatibility of surfactants with pH and pH adjusting agents. Based on these suggested standards and experimental method, highly stable and dispersive aqueous suspensoid of nm-ZnO, nm-TiO〓, nm-Co〓O〓 and nm-MnO powders were prepared successfully and surface modification on these nano-powders was also achieved.

本文第三章通过大量的文献调研，归纳总结了前人在纳米粒子分散技术方面的理论和经验，并在此基础上根据纳米氧化物粉体的表面润湿性、表面电性及其与分散介质pH值的关系、表面活性剂及其与pH调节剂的配伍关系设计了纳米氧化物水分散体系的工艺规范以及确定工艺参数的通用实验步骤，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，为纳米材料在氧化锌压敏电阻中的应用创造了第二个前提条件。

Compared with formerly used crude mica and polyquadrifuorethene, Fluorocrytal Mica with its purity has high body resistivity (100 times than crude mica), low loss in high frequency medium ( 1 time smaller than crude mica), moderate dielectric constant, safe use temperature up to 1100℃, good intensity, elasticity, unaging, and consequently good electric stability.

与原来使用的天然云母和聚四氟乙烯比较，氟晶云母由于质地纯净，具有较高的体电阻率（比天然云母高约1000倍），高频介质损耗低（比天然云母小1倍），介电常数适中，且安全使用温度可达1100℃、强度好、富有弹性、不易老化，因而其电性能非常稳定。

The Al/PAR/Al structure could be described as a simple circuit equivalent to parallel connection of a variable resistor and a capacitor.

Al/PAR/Al结构可以简单等效为电阻与电容的并联，而退火与自然放置将使薄膜结构趋于稳定。

Optimum designs of fundamental circuits such as analog switch, reference resistor ladder and voltage comparator are also carried out.

首次提出并联方式参考电压电阻网络结构，有效地提高了参考电压的精度，加快了输出稳定速度。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了