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线路频率
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     Bus Service Frequency Optimal Model
     公交线路发车频率优化模型
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     ON FREQUENCIES
     频率
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     X—Band Microstrip Low Noise Frequency MuItiplier
     频率指示器
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     Optimal model of urban bus frequency determination
     城市公交线路调度发车频率优化模型
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     An Approach to CAD in Electronic Circutis
     电子线路CAD
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  line frequency
It is shown that the hysteretic dependence of the spectral line frequency on the applied pulse amplitude may take place for both one and several simultaneously generated harmonics.
      
The line frequency varies from 12 to 60 Hz depending on activity of ionospheric ionization sources and local characteristics of a meteor shower, time of day, etc.
      
The electronic resolution is 0.1 s, giving a relative standard deviation σrel, which is determined by the stability of the line frequency at sufficiently long retention times.
      
Its DSP-based realization is also presented, which is characterized by time-variant rate sampling, quasi synchronous sampling, and synchronous operation among the line frequency, PWM generating and sampling in A/D unit.
      
Cesium-clock referenced, frequency chain measurements of the resultant line frequency are presented together with detailed studies of the line shift sensitivities to various operating parameters.
      
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This paper presents the frequency response of the single and multi-stages analog amplifier circuit. And the formula of calculating general angles for the multi-stage amplifier circuit is deduced.

本文讨论了单级和多级耦合模拟放大线路的频率特性 ,并推导出计算多级耦合模拟放大线路总相移角的公式

Aiming at the inherent electrical parameters of cables and using monolithic processor as the process core, the design principles and basic configuration of a cable testing instrument are introduced. With this instrument the frequency characteristics of the cable line can be fastly detected, and the nature of the broken, short circuit faults and the mixed line faults of cables as well as the fault locations can be judged and located.

 介绍了以电缆固有的电参数为检测对象,以单片机为处理核心的电缆测试仪的设计原理及其基本组成。应用该仪表可快速检测电缆线路的频率特性,判断并定位电缆的断、短、混线故障的性质及故障点。

According to the frequency characteristic of an even transmission line,when the frequency is lower than fm,the input impedance of an unloaded even transmission line is capacitive,and the line maybe modeled as a capacitor.The healthy line is unloaded for zero-sequence component when a single-phase fault occurs in a non-solid earthed network.The zero-sequence angle-frequency characteristic of the lines are studied based on it and the characteristics of transient zero-sequence current in different frequency bands...

According to the frequency characteristic of an even transmission line,when the frequency is lower than fm,the input impedance of an unloaded even transmission line is capacitive,and the line maybe modeled as a capacitor.The healthy line is unloaded for zero-sequence component when a single-phase fault occurs in a non-solid earthed network.The zero-sequence angle-frequency characteristic of the lines are studied based on it and the characteristics of transient zero-sequence current in different frequency bands when a single-phase fault occurs in a non-solid earthed network are found.In SFB(Selected Frequency Band),the polarity of transient zero-sequence current in faulty line is opposite to that in healthy ones.The wavelet packet is used to decompose transient zero-sequence current and the coefficients represent the polarity of the current.Comparison of coefficient signs can find out the faulty line.The EMTDC simulations indicate that the method can find out the faulty line correctly and prove that the analysis of the angle-frequency characteristic of zero impedance of the line is correct.

根据均匀传输线路的频率特性,对于空载线路,当频率小于fm时,线路输入阻抗呈容性,线路可用一集中电容等效。小电流接地系统发生单相接地故障时,对零序分量而言,非故障线路相当于空载。根据这一特点,对小电流接地系统中线路的零序参数相频特性进行研究,得出系统发生单相接地故障时不同频带上暂态零序电流特性。在选定频带SFB(SelectedFrequencyBand)内,非故障线路零序电流极性和故障线路相反。应用小波包对各线路的暂态零序电流进行分解,小波包系数的符号代表了相应频带零序电流的极性,通过比较SFB内小波包系数的符号,便可找出故障线路。EMTDC仿真试验结果表明该方法可以准确地实现单相故障选线,并验证了文章对输电线路零序输入阻抗相频特性分析的正确性。

 
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