无系统的

In order to eliminate the harm brought by the wave aberrance of voltage and current, it is necessary to control the harmonic wave and compensate the reactive power. So it is very important to test the electric parameters.

为了消除电压、电流的波形畸变产生的危害，就必须对电力系统进行谐波抑制和无功补偿，因此对电力系统中的电气参数进行测试和分析就显得尤为重要。

The measure error of circumstantialities is less than 5 percent. 2. The optimizing of circumstantialities reduces T/NH3 cost over 3 percent. 3. Hydrogen and nitrogenous eligible rate reach over 98 percent on the condition that less change of the amount. SanYuan Chincon Co., Ltd asseverate:"consumers can reimbursement if disinvestment can't be achieved in three months."

ZF—4系统属投资小，见效快的技改项目，它的技术指标有： 1、炉况测量误差小于5% 2、炉况优化降低吨氨入炉煤3%以上 3、氢氮比控制在无大加减量的情况下，合格率大于98%安徽三元公司郑重承诺：引进ZF—4系统若三个月收不回投资，用户可以退货。

In this paper, the change of back electromotive force current with the different PWM modes are analyzed in detail on the base of BLDCM model. According to theory and experiment ,ON-PWM type restrains the peak value of back electromotive force current and brings the lest effect to the motor control system.

基于无刷直流电动机的数学模型，分析比较了不同PWM调制方式下反电势电流的变化规律，并通过理论推导和仿真实验证明了当电机系统采用ON-PWM调制方式时，能有效地抑制反电势电流的峰值且对电机控制系统造成的影响最小。

This paper precisely conducts the special topic research in view of some important technologies of the digitized control module.(1) AC motor control circuit of PAN/TILT is designed ,which speed is controlled by AT89C51 MCU. DC motor control circuit of LENS is designed too.(2) The hardware and software of automatic temperature control is designed, which used in camera protect box without A/D IC. A kind of single wire communication IC is used in the circuit. So, the program is given.(3) A method of video switch without picture shock is discussed in this paper, and 16x8 video switch circuit is designed. AT89C51 can carry out time sequence logical control with the sync signals by request..(4) The module of real-time clock is designed, in which, LCM is used, a kind of three-wire communication IC is used too.

1给出了一种由89C51单片机控制的简单易行的交流云台转动变速控制电路，实现了云台及其电动三可变镜头的控制；(2)给出了无需外加A/D、单线通信的防护罩自动温度控制电路，完成了单片机温度控制软件的设计；(3)提出了"无抖动"视频切换的设计思想，给出了16×8的视频切换电路，利用单片机在视频信号的场消隐期控制切换，从而实现了"无抖动"切换；(4)给出了一种三线接口通信的液晶显示实时时钟电路，完成了程序设计；(5)提出了在视频监控系统数字控制模块中，用CAN总线取代传统的RS-485总线，实现PELCO-P协议传输的方案。

In thethesis we present a method to calculate the dielectric function of therandom composite and give the expression of the effective dielectricfunction.

在本文中，我们将计算周期性结构介电函数的表达式推广到无规系统，给出了无规系统有效介电函数的级数表达式，并得到了稀浓度时的解析表达式。

Finally, the article expounds the completed design of knowledge in the course of accounting Computerize, whether the design of knowledge is good or not is an important aspect to evaluate whether there is practical value ornot in this system.

最后，阐述了本系统中已完成的《会计电算化》课程的知识点设计工作，知识点设计的好坏是本系统有无实际价值的一个重要方面。

It is also proved that the controller based on the reduction method stabilizes more systems than the existing memoryless controllers in the case of a degenerate model.

文中还证明了系统在退化模型情况下使用还原法所设计的控制器与传统的无记忆控制器相比能够镇定更多的系统。

The paper is mainly about the use of the embedded system in the digital recorder and the method to design the driver in the embedded system.

本课题主要研究嵌入式系统在无纸记录仪中的应用和嵌入式系统中的驱动程序的设计方法。1。

The parameter of distribution network equivalented was identified by using genetic algorithm.

将辨识后的系统同辨识前的系统在同样扰动下，对扰动过程中的电压、电流、有功、无功进行了比较。

They are particularly very promising energy storage systems to replace traditional secondary batteries for space application since URFCs have distinctive advantages over secondary batteries in that they are long-term energy storage systems with extreme high specific energy and without permanent losses by self discharge and capacity limit.

一体式可再生燃料电池是可再生燃料电池中最先进的一种，它是在同一组件上既可以实现燃料电池功能又可以实现水电解功能的储能和供电系统，具有能量密度高、使用寿命长、使用中无自放电且无放电深度及电池容量的限制等优点，是极有希望在空间、军事及可移动电源领域替代传统二次电池的储能系统。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。