The expressions for calculating second order susceptibility are deduced, and the numerical calculation is performed.
推导了二阶极化率的表达式，并进行了数值计算。
This method could efficiently overcome the numerical oscillation and improve the calculation accuracy in spatial to second order.
普通的迎风差分格式只有一阶精度，修正的迎风差分格式可以把空间的计算精度提高到二阶。
The advanced first order and second moment iterative method are employed for calculation on reliability index and failure probability.
采用改进的一次二阶矩法对腐蚀管道的可靠性指标和失效概率进行了分析和计算。
Based on ideal trajectory calculation, characteristic points are chosen. On each point, plant is simplified as a second order one.
在理想弹道计算的基础上选取特征点，在每个特征点，将对象简化为一个二阶环节来近似。
The influence of atomic motion, the field structure and intensity of photons on second-order correlation function and two-mode correlation function are obtained by numerical calculation.
通过数值计算分析了原子运动速度、场模结构参数和平均光子数对光场二阶相干度和模间相干度的影响。
The algorithm avoids the singular decomposition that commonly used in off-line calculation, and only the second order statistics of the signals is used, so the algorithm has low computing cost.
该算法避免了离线计算所采用的特征值分解等复杂运算，并且只利用信号的二阶统计量信息，计算工作量低。
The main conclusions obtained in this thesis are as follow:(1) Based on FOSM, Second-order second-moment method modifies the results of FOSM, and has better calculation accuracy.
本文的主要结论有：（1）二次二阶矩法是以一次二阶矩法为基础，并对一次二阶矩法的计算结果进行二次修正，在多数情况下有着更好的计算精度。
The main conclusions obtained in this thesis are as follow:(1) Based on FOSM, Second-order second-moment method modifies the results of FOSM, and has better calculation accuracy.
本文的主要结论有：（1）二次二阶矩法是以一次二阶矩法为基础，并对一次二阶矩法的计算结果进行二次修正，在多数情况下有着更好的计算精度。
应用推荐