比较原理

On the basis of the above results of detecting methods, the instruction signal calculating circuit is designed according to i〓, i〓 calculating mode. Compensation current generating circuit is also designed and implemented. Its current following circuit is designed according to the instantaneous value comparing mode that used constant time control. The source current detection based control mode and composite control mode and their implementation are firstly introduced in our country. The method and the principle of dc side capacitor voltage control are explained clearly.

根据检测方法的研究成果，采用i〓、i〓运算方式构成并联型电力有源滤波器的指令电流运算电路；对补偿电流发生电路进行了电路设计和实施，其中电流跟踪控制电路采用电流跟随性能好、可靠性高的定时控制瞬时值比较方式；在国内首次研究并实施检测电源电流控制方式和复合控制方式；清楚地阐明了并联型电力有源滤波器直流侧电压控制的原理和方法，并在装置中实施。

Calorimetric is very novelty and effective as an important way of heat-analysis technology. DSC, ITC etc stress on their mechanism and application in the science of life were introduced.

微量热法作为热分析技术中的一种重要的方式，是一种比较新颖而且有效的热分析技术，介绍了DSC，ITC等2种典型的微量热法的原理及其在生命科学研究中的应用。

Here is our offer is simple and economical pseudolarix Chrysanthemum bubble bath Principle: the chrysanthemum as compositae chrysanthemum and varieties of micro capitulum, cold, taste bitter, lung, liver into the role.

以下是本店提供比较特色又简便经济的中草药材菊花泡澡原理：菊花为菊科植物菊及其变种的头状花序，性微寒，味甘、苦，入肺、肝经作用。

The possibility was discussed that the conventional mechanic carding machine was modified with a computer automatic controlling system based on the artificial neural network.

探讨了利用人工神经网络进行粗梳毛纺毛条质量控制的原理及方法，探讨了用基于人工神经网络的计算机自动控制系统改造传统机械式梳毛机的可能性，通过比较基于人工神经网络的计算机自动控制系统与一般自动控制系统提出了基于人工神经网络的计算机自动控制系统，经对实测数据验算，控制精度十分理想。

Then the performance of the system was compared with the other systems, and a kind of time synchronization and carrier wave synchronization method was introduced.

分析了其调制原理，和体制性能，与其他体制作了简单比较，并针对解调结合现有算法，提出了载波同步和定时同步的实现。

Introducing the user algorithm of the broadcast ephemeris, the algorithms are explained on principle, which are Lagrange Interplation and Chebyshev polynomial simulation. Then comparisons of calculating of satellite coordinate with broadcast ephemeris and with precise ephemeris are made.

推导了广播星历用户算法，对GPS数据处理中常用的拉格朗日内插和切比雪夫多项式拟合从原理上进行了阐述，并对广播星历卫星坐标计算和精密星历卫星坐标计算进行了分析比较。

This exhibit displays the inner structure of a cinematograph, the working principle of a motion-picture camera, mechanism for time-lapse photography, sound reproduction of an optical track-changing sound track, and a comparison of film and TV signal definition.

展示了放影机的内部构造，间歇抓片机构工作原理，视觉暂留机理，变积式光学声迹声音还原，比较电影与电视的清晰程度。

The essay compares the output rate of class AB power amplifier with calss D s,and affirms the advantages of class D in high efficiency,and sums up its principle of work,and also carries on the design and analysis of class D power parameter.

分析比较了 AB类功率放大器与D类功率放大器的输出率，肯定了D类功率放大器效率高的优点，总结了D类功率放大器的工作原理，并对D类功率参数进行了设计分

In the one half part, according to the strontium nature, thermodynamic calculation of correlative reaction and the principle of the vacuum aluminothermy reduction process, with the laboratory findings of preparation strontium by vacuum aluminothermy reduction compared and analyzed in different parameter conditions, a variety of factors which effect the decomposition rate of SrCO_3 and the percent reduction of strontia are gotten out. The factors include that the decomposition rate of SrCO_3 is influenced by different addition and pressure. They also include that the percent reduction of strontia is influenced by excess coefficient of reducing agent aluminium powder, the particle size of raw material or reducing agent, the pressure of barbecuing, temperature and reduction time. According to those, we can draw the conclusion as follows:(1) Decomposition temperature of SrCO_3 is decreased by adding carbon and alumina in different degree.(2) With quantitative carbon added under the vacuum condition, the decomposition temperature of SrCO_3 is decreased obviously, which can fall 150℃ compared with atmospheric pressure.(3) In keeping 1150℃ of 2.5h, under the 5Pa vacuum condition, the decomposition rate of SrCO_3 nearly keeps in 99% steadily.

在前半部分的真空铝热还原法中，根据锶的性质、相关反应的热力学计算及真空铝热还原法原理，通过对不同参数条件下的真空铝热还原法生产金属锶的实验结果的分析比较，得出了影响SrCO_3的分解率和氧化锶的还原率的种种因素，具体因素包括不同添加剂、不同气压对SrCO_3分解率的影响，还原剂铝粉的过量系数、原料与还原剂的粒度、制团压力、温度和还原时间等对氧化锶还原率的影响，得出具体结论如下：(1)添加碳和Al_2O_3能不同程度的降低SrCO_3的分解温度；(2)真空条件下加入一定量的碳可显著降低SrCO_3的分解温度，比之常压下可降低150℃之多；(3)在1150℃恒温2.5h、真空度达到5Pa的条件下，SrCO_3的分解率几乎保持稳定在99％；(4)氧化锶的还原率随还原剂过量系数的增大而增大，但是趋势越来越小，当过量系数超过25％后，氧化锶的还原率几乎不再增加；(5)氧化锶的还原率随原料与还原剂的粒度的变细而增加；(6)氧化锶的还原率随制团压力的增加而增加，但超过一定值后，氧化锶的还原率反而会下降；(7)氧化锶的还原率随还原温度的升高而增加；(8)氧化锶的还原率随还原时间延长而增加，在本实验条件下，超过2.5h趋于稳定。

This paper introduces the principle and technique of river way immersed tube construction, and compare with traditional river way cofferdam construction.

本文介绍了河道沉管法施工原理和工艺，并与传统的河道围堰施工作了一定的比较。

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。