误差曲线

Theoretically, the error model of maximum direction is more rigorous for describing error of transition curve lines.

通过实例说明了εm模型是理论上更加严密的缓和曲线误差模型，而εσ模型是一种简化的描述模型。

Compared the calculated curve and the real assay curve we can make a conclusion that: this method can calculate the melting time of the fuse at the huge short current (more than 50 times of the current rating) with the error less than 5%; the resistor and time characteristic can also be acquired, it provided the date for overvoltage calculation of the fuse model. The research of the overvoltage during fusing process is based on short circuit test of the fuse.

由计算结果与实际试验曲线对比可得：该种方法能够比较准确地计算出较大短路电流下(熔断器额定电流的50倍以上)熔断器的弧前时间，误差一般在5%以内；同时还可以算得熔断器在弧前的电阻时间特性，为开断过电压仿真计算电路中的熔断器模型提供数据。

Among routine three impulse control system, because reason of " false liquid location" make steam load rise and drop dynamic characteristic when curve asymmetric, degeneration, can't ask out the accurate mathematics model when and there are the systematic parameters, can't design the accurate feedforward controller either, can only realize the static feedforward , can realize that there is not error in the stable state , but does not control dynamic performance well.

而在常规的三冲量控制系统中，由于&虚假液位&的原因使得蒸汽负荷上升和下降时的动态特性曲线不对称，且系统参数具有时变性，不能求出准确的数学模型，也就不能设计出准确的前馈控制器，只能实现静态前馈，能实现稳态无误差，但对动态性能控制不好。

The author briefly introduces the channel estimation methods and decision criterions of both SISO-OFDM system and MIMO-OFDM system, and gets the compared figures about performance of mean square error and bit error ratio.

作者简要介绍了传统SISO-OFDM系统和MIMO-OFDM系统信道估计的方法和判决准则，并给出了这些算法之间的均方误差和比特误码率的性能比较曲线。

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。