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  is necessary to
    Hence, in order to supervise and manage the market members’ behavior, it is necessary to study the market power of generation companies.
    为了规范电力厂商的行为,加强市场监管,有必要对电力市场下电力企业,特别是发电公司的市场力进行理论研究。
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    It is necessary to quantitatively calculate the losses of HVDC system to reduce its loss and improve its economy.
    为进一步降低直流输电系统的网损,提高直流输电系统的经济性,有必要对直流输电系统的网损进行定量计算。
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    In order to detect early and avoid misadjusting, it is necessary to carry out faults real-time monitoring and diagnosis in the excitation system.
    因此,有必要对励磁系统进行故障实时监测、诊断,在故障发生时能迅速发现、及时处理,避免误调节,减少损失。
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    Therefore it is necessary to study on it.
    因此有必要对其进行研究。
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    For the power cables in service, it is necessary to carry out on-line insulation monitoring and diagnosis so as to master its insulation condition.
    对运行中的电缆,为了掌握其绝缘状况,有必要对之进行在线的绝缘监测及诊断。
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    In order to avoid the case, we should study the dynamic characteristics of frame and core during the process of design and manufacture.
    为了避免这种情况的发生,因此在发电机的设计制造过程中有必要对定子机座、铁芯的动力特性进行研究。
    So according as the fact of Chongqing power system,the paper will investigates the 110kV power transmission line because lightning often stroked the line last years.
    重庆电力公司110kV输电线路承担着重要的输电任务,但防雷运行资料表明,110kV输电线路雷击跳闸率在110kV及以上电压等级线路中最高,雷击故障频繁,因此有必要对重庆110kV输电线路防雷问题进行深入研究,提出提高110kV输电线路防雷性能的综合措施,减低雷击跳闸率。
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    In order to improve the modelling of the erosion process, it is imperative to measure the instantaneous current density on arc root.
    为了深入了解电弧弧根功率输入过程,从而对侵蚀过程进行合理建模,有必要对触头弧根瞬时电流密度进行测量。
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    The results of study show the flue gas after desulfuration affects strongly upon the 10CrMnCuTi, it is neccessary to carry out anticorrosive treatment for the chimney after the wet desulfuration system.
    试验结果表明,脱硫后烟气对10CrMnCuTi有强烈的腐蚀作用,有必要对脱硫后烟囱进行防腐蚀处理。
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    With the progressive establishment of socialist market economy,oil-fired thermal plant should no longer be a limit for the each power system in China.
    随着社会主义市场经济体制的逐步建立,燃油机组将不再成为限制,因此有必要对各种可能的替代电源进行分析比较。
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It is necessary to modify the structure of digital control systems and develop new control algorithms, which is done in this paper.
      
It is necessary to test for varying dispersion in generalized nonlinear models.
      
It is necessary to select the catalyst with proper Pt loading when the anode of a direct-methanol fuel cell is prepared.
      
Therefore, it is necessary to implement automatic mitigation which can detect worm and drop its packet.
      
It is necessary to consider such limit behaviors when we consider the properties of infinite objects in computer science, such as infinite logic programs, the symbolic solutions of infinite polynomial equations.
      
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It is pointed out, while expounding the principle of chopper speed variation, that the value of peak current can affect the service life of components and so it is necessary to control. After studying the law of variation for transient current, the author brings out the basic thought for its control. With the example of practical current samples, the paper describes the function of circuits in all sections consisted in the speed variation diagram of GTO chopper which is microcomputer controlled, showing the...

It is pointed out, while expounding the principle of chopper speed variation, that the value of peak current can affect the service life of components and so it is necessary to control. After studying the law of variation for transient current, the author brings out the basic thought for its control. With the example of practical current samples, the paper describes the function of circuits in all sections consisted in the speed variation diagram of GTO chopper which is microcomputer controlled, showing the system diagram or block diagram for currcnt control. In the end, a description of the driving operation process for electrically-powered vehicle is given with its transient current controlled by microcomputer.

文章阐述了斩波调速原理,指出峰值电流的大小会影响元器件的寿命,所以有必要对瞬时电流的大小进行控制。通过讨论瞬时电流的变化规律,提出控制瞬时电流的基本思路。文章以实际电流采样为例,讨论了微机控制的GTO斩波调速电路图中各部分电路的作用,列出了电流控制的程序图及程序框图,最后还对电动车辆在瞬时电流微机控制下的司机操作运行过程作了说明。

The general performances of the DC precise temperature control circuitry have been reported up to now. But as the circuitries practically designed are varied, it is necessary to study in detail the performances for each kind of circuitry, In this paper, an analysis and comparison of the most typical circuitries are made and the effects of the linearity of the amplifier gain on the accuracy of temperature control are discussed. Based on the results obtained, some problems of the circuit design and the circuit...

The general performances of the DC precise temperature control circuitry have been reported up to now. But as the circuitries practically designed are varied, it is necessary to study in detail the performances for each kind of circuitry, In this paper, an analysis and comparison of the most typical circuitries are made and the effects of the linearity of the amplifier gain on the accuracy of temperature control are discussed. Based on the results obtained, some problems of the circuit design and the circuit debug are indicated for improving the performances of the circuitry.

直放式温控电路的一般性质,已有文献报导,但因实际的直放式温控电路形式多样,因此有必要对各类电路的性能进行详细的研究.本文将对最典型的电路就放大器增益的线性程度对控温精度的影响,进行分析比较,以便更深入地了解各类电路的性能.

When new type of fly-back transformer (FBT) with smaller inductance in its primary coil L_p is used in color display, collector current I_(cp) flowing through the saturated on horizontal output transistor consists of not only the forward sawtooth current I_(γcp) flowing in deflection york L_y, but also the not to be ignored forward sawtooth current I_(Fcp) flowing in the primary coil of the FBT, i. e., the peak current I_(cp) (6.1A)=I_(γcp)(3.9A)+I_(Fcp).(2.2A) in card CGA. Therefore it is necessary to modify...

When new type of fly-back transformer (FBT) with smaller inductance in its primary coil L_p is used in color display, collector current I_(cp) flowing through the saturated on horizontal output transistor consists of not only the forward sawtooth current I_(γcp) flowing in deflection york L_y, but also the not to be ignored forward sawtooth current I_(Fcp) flowing in the primary coil of the FBT, i. e., the peak current I_(cp) (6.1A)=I_(γcp)(3.9A)+I_(Fcp).(2.2A) in card CGA. Therefore it is necessary to modify the formula used to calculate the current in the circuit of horizontal output stage.

当彩色显示器使用初级线圈电感量L_P较小的新逆程变压器时,流过饱和导通行输出管的集电极电流I_(CP),不但包括偏转线圈L_Y中的正向锯齿波电流I_(YCP),还有不能忽略的FBT初级线圈中的正向锯齿电流I_(FCP),即CGA卡时峰值电流I_(CP)(6.1A)=I_(YCP)(3.9A)+I_(FCP)(2.2A)。因此有必要对行输出级电路的电流计算公式作相应的修正和补充。

 
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