The exact formulae of the acoustical impedance of a narrow slit and its low-frequency approximation are available.
窄缝的声阻抗严格公式以及低频近似公式都存在。
The amount of calculation is greatly decreased over high frequency zones by using high-frequency approximation method.
采用相对相位叠加的高频近似方法，处理天线阵高频区散射的计算，大幅减少了计算量。
The high-frequency approximation solution that includes the caustic region is obtained with the method combining the geometrical optics.
解决了几何光学法无法在焦散区求解的问题。
A new symplectic geometrical high frequency approximation method for solving the propagation of electromagnetic wave in an inhomogeneous medium is presented.
提出了一种基于辛几何的高频近似的新方法，并用此方法求解了电磁波在一非均匀媒质中的传播问题。
A hybrid technique for calculating the scattering of two-dimensional large bodies with slots is developed by combining high-frequency approximation method with low-frequency numerical method.
本文利用高频近似方法与低频数值方法相结合的混合方法计算二维开槽电大目标的散射。
By using MATLAB signal and using window method, frequency sampling and Chebyshev approximation the design of low pass digital filter in the toolbox have been processed.
采用窗函数法、频率抽样法和切比雪夫最佳一致逼近法，通过调用Matlab信号处理工具箱中的函数设计低通数字滤波器。
The polynomial approximation method is also employed to obtain simple formulas for frequency and amplitude correction.
本文利用多项式逼近方法获得了频率和幅值修正的计算公式。
Then the accuracy of approximation, regularity of many-knot splines interpolation method and frequency property of the interpolation kernel are worked out for comparison.
然后分析了多结点样条插值方法的逼近精度、正则性、插值核函数的频域特性。
A series of new formulas for frequency characteristic approximation are worked out and specific approximation method is given.
文中导出了一系列的新公式，并阐述了具体的逼近方法。
For a Doppler radar homing seeker with high pulse repetition frequency, the continuous wave approximation is not only simple, but also has a high calculation accuracy.
对于使用高脉冲重复频率的主动多普勒雷达导引头，连续波近似法不仅计算相对简单，而且可以给出较高的计算精度。
Under the first-order approximation of Taylor expansion, the analytic expression for the defect mode frequency is derived, from which the coupling factor is deduced.
利用泰勒展式的一级近似，得到了缺陷模频率的解析表达式，进而得到紧束缚理论中的耦合因子。
But when the sampling frequency of successive-approximation ADC is too high, the switched capacitor can't be charged properly. And this will result in too big conversion error.
但当逐次比较式adc的采样频率过高时，会使其内部采样保持的开关电容充电不充分，从而导致ADC转换误差过大。
The depth migration with higher-order approximation by time-shift algorithm eliminates the frequency dispersion and amplitude distortion in the calculation process.
本文使用高阶方程深度偏移方法，并且在计算中采用了一种与差分运算等价的时移法解决了计算中出现的频散和振幅失真问题。
The normalized birefringence and modal dispersion as functions of normalized frequency for different aspect ratios are presented and compared with Guassian approximation.
文章比较了多模光纤和塑料光纤的结构参数和模式数量，并对大量的模式色散会严重限制光纤的带宽作了分析。
The normalized birefringence and modal dispersion as functions of normalized frequency for different aspect ratios are presented and compared with Guassian approximation.
文章比较了多模光纤和塑料光纤的结构参数和模式数量，并对大量的模式色散会严重限制光纤的带宽作了分析。
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