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    AC small signal equivalent circuit model on RTD is the basis for analysing the AC characteristics of RTD,and also is the dependence of AC parameters extraction and cut-off frequency fR calculation from S-parameters measurement by network analyzer.
    RTD交流小信号等效电路模型是分析RTD交流特性的基础,也是用网络分析仪测量S参数,拟合提取交流参数和计算截止频率fR的依据。
    3. Based on the relations among Et, Ht and Hz,or Ht, Et,and Ez in rightangular coordinate, and cylindrical coordinate, the procedure of calculating cutoff frequency and attenuation coefficient with FDM has been presented for determining the parameters of waveguides, the rectangular waveguide, circular waveguide, fan-shaped waveguide, and isosceles-right triangular waveguide have been analyzed.
    3.从直角坐标系、柱坐标系等具体坐标系中TE波、TM波电磁场的纵横关系出发,以矩形波导、圆形波导、等腰直角三角形波导、扇面波导等规则波导为例,总结分析了计算截止频率和衰减常数的步骤;
    In this study, we also examined the influences of the temperature-dependence of the absorption coefficients of water vapor, the upper level cutoff and the integration step for altitude, and substituting a quasi-grey approximation for the exact integration over wave number, on the calculation of infrared cooling rate due to water vapor.
    同时,我们还考查了水汽吸收系数的温度效应,计算截止高度和高度积分步长的取法以及用准灰体近似代替精确的频率积分等对水汽红外冷却率计算的影响.
    In this paper, the equivalent index of symmetrical periods is extended to the complex-number fields, then the reflectance in the stop band is calculated with the aid of the formulas of complex function.
    首先把对称周期的等效折射率推广到复数范围,然后利用复变函数公式来计算截止带中的反射率.
    The experimental set-up and the measurement on the cut-off wavelength of the conventional SM fibers are also described. The results are in fundamental agreement with that of communication power method and the calculation of matrix cut-off wavelength.
    文中还介绍了角向测试法的实验装置及对常规单模光纤进行了截止波长测试,测试结果与传输功率法测试结果及矩阵法计算的截止波长基本相符。
    The causes of the lower results to calculate cut-off grade according to the averaga recovery of mieral procesing was analyzed.
    分析了按平均选矿回收率计算截止品位时,计算结果偏低的原因。
    The calculating formula of cut-off grade was proposed by the average recovery or the recovery corresponding to cut-off grade. While there are some difficulties in this calculation.
    提出了按平均选矿回收率或按截止品位对应的回收率计算截止品位的计算公式,同时指出了计算上的困难。
 

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