直流的

This protection machine series product make use of to respond to quickly not the line presses the component , assurance the direct current system is positive, the anode, cathode and as and anodes and the potential difference of the as settle, allowing appear temporary in the direct current system conduct electricity press limit the weak electricity equipments inside the scope, thus insuring the equipments safety movement.

本保护器系列产品利用快速响应的非线性压敏元件，保证直流系统正、负极间，正极与地间及负极与地间的电位差恒定，将直流系统中出现的暂态过电压限制到弱电设备的允许范围内，从而确保设备安全运行。

MIRDC is engaged in the research to develop the coin type blushless motor since 2005. Additionally MIRDC collaborates with Motor Center of National Cheng Kung University to develop the coin type motor under the considerations of basic motor theories and mass production technology.

本研究与成功大学马达中心合作，自基础学理出发，并纳入量产技术的考量，并在94、95年度，分别成功地开发出采用轴向气隙、轴向磁通设计的ψ17mm x t3mm、ψ15mm x t2.5mm扁薄型直流无刷马达。96年度的研发重点在突破国际现有技术水准，预定开发出ψ12mm x t2.5mm的直流无刷扁薄型马达。

Alumina Bayer production desiliconization workshop, easy to coke possession of the road, easy to use separate Pressure Seal Globe Valves valve type, valve seat can be place, and carbide seal pair of DC-style cut-off valve or DC-type throttle valve.

氧化铝拜耳法生产中的脱硅车间、易结焦的管路上，易选用阀体分开式、阀座可去处的、硬质合金密封副的直流式截止阀或直流式节流阀。

Because of the high cost of permanent magnet, optimizing for brushless DC motor design is an inevitable choice, which is a comparatively mature and multiplicate technique after these years developing.

因为永磁材料的成本较高，所以对无刷直流电动机进行优化就成了必然的选择，无刷直流电动机的优化发展至今，已经是一项比较成熟的技术，优化方法也多种多样，各有优异。

A18430 Maximum Ratings: A18430 Pinout: DC input range: 180 - 375V Input surge withstand: 400V for 100ms DC output: 3.3V Programmable output: 10 to 110% Regulation: 0.2% Efficiency: 77.5% Maximum operating temperature: 100C at full load Power density: 60W/cubic inch Height above board: 0.43 in.(10,9 mm) Parallelable, with N+M fault tolerance Low noise ZCS/ZVS architecture

A18430最大额定值： A18430引脚说明：直流输入范围：180 - 375V输入浪涌承受：为100ms的400V的直流输出：3.3V的可编程输出：10至110％调节：0.2％的效率：77.5％最大工作温度：100C读写器在满负荷功率密度：60W/cubic英寸高光明正大：0.43英寸（10.9毫米）可并行与N +男容错低噪音零电流/零电压架构

Exchange power supply system including electrical network height power source, kerosene engine power set emergency power supply (long time emergency power supply), integral part's UPS power source; The cocurrent power supply system by the rectifier, the accumulator cell (short time emergency power supply), the direct-current converter as well as the corresponding power distribution cabinet is composed; The good earth and the antimine device, may improve the correspondence quality, guarantees the communication facility and operator's security.

交流供电系统包括电网高低电源、油机发电机组备用电源、重要部门的UPS电源；直流供电系统则由整流器、蓄电池、直流变换器以及相应的配电柜组成；良好的接地和防雷装置，可以提高通信质量，确保通信设备及操作人员的安全。

At last ,it drew a conclusion that summarined the design thought of permanent magnetic brushless DC motor control system after absenting waves of controllers work . Permanent Magnetic Brushless DC motor control system canbecome main power source in ship electric propulsion field ,and the research have important s signification.

最后，在控制系统实际运行时对波形进行了观测，给出了结论，总结了无刷直流电机控制系统的设计思想，提出永磁无刷直流电机将成为船舶电力推进的主要动力，对其控制系统的研究具有广泛的应用价值。

The main reason of decreasing of AC pollution flashover voltage with the dropping of pressure on the simple plane model is the reducing of the requirement of AC arc to develop under low pressure.

由于气压对于交流电弧发展条件的影响程度大于气压对于直流电弧伏安特性的影响，使得低气压下交流污闪电压的下降指数大于直流污闪电压的下降指数。

Because of its fast and flexible controllability, the voltage source converter based high voltage direct current will be widely applied in power systems, so it is of practical significance to study the dynamic performance of VSC-HVDC in complicated power grids. The quasi steady state response of flexible HVDC system can be simulated in power system simulation software PSS/E.

柔性直流输电系统(voltage sourced converters high voltage direct current，VSC-HVDC)因其快速灵活的可控性在电力工业中将有越来越广泛的应用，研究其在复杂电力网络中的动态性能具有工程实际意义，应用电力系统仿真软件PSS/E可模拟柔性直流输电的准稳态响应。

In this paper ,The inertia load disturbance is included in the double loop DC motor control system, Analysis of the load moment of inertia and The width of the linear area of nonlinear saturation relationship,use the method of "quasi-equivalent" modeling to model the nonlinear state space of the DLM with variable load,tested the speed response of the real system, and used an improved genetic algorithm to accurately identify the model's parameters.

本文将惯量负载的扰动纳入直流电机双闭环调速系统，分析了负载转动惯量与饱和非线性的线性域宽度λ的关系，运用&类等效&建模的方法，建立了变负载直流电机双闭环调速系统非线性状态空间模型。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。