一、保证积分精度对积分阶次的选择原则 完全积分(Full Integration):高斯积分阶数 等于被积函数所有项次精确积分所需要阶数的 积分方案。 减缩积分：由完全多项式最高方次p选择高斯 积分。
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由表面粗糙度引起的散射光的‘全积分散射’（TIS）与PSD的零级矩有关。
The "Total Integrated Scatter" (TIS) of the scattered light caused by surface roughness is found to be related to the zeroth moment of the PSD.
采用膜内积分与全隐式有限容积相结合的数值方法求解理论模型。
A combination of integral and completely implicit finite volume numerical method was adopted to solve the governing equations.
本文利用全波分析，建立了口径耦合微带天线的谱域积分方程，并用矩量法求其数值解。
Applying the full wave analysis for aperture coupled microstrip antennas, the spectral domain integral equations are founded and solved numerically by the method of moments.
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