本文提出了海洋平台结构系统疲劳可靠性分析的一阶二次矩方法。
A first order second moment formulation for systems fatigue reliability assessment of offshore structures is presented.
3方差的专业定义是随机变量的二次中心矩，与期望值之差的平方的加权平均值。
The technical definition of variance is the random variable's second central moment, the weighted average of the square of the differences from the expected value.
从空域与时域的相似性出发，把克尔介质近似为时域二次折射率介质，从而得到了脉冲在该介质中的解析形式，并给出了相应的时域传输矩。
From the analogy between pulses propagation in time and the paraxial optics, the nonlinear Kerr media is approached by a time quadratic index media.
本文利用矩量法和基于二次插值法的优化方法对电抗加载定向天线阵进行了分析计算。
Analysis and computation of reactively loaded directive arrays is done by using the method of Moments (MOM) and an optimization procedure based on a quadratic interpolation method.
采用矩量法确定了盐酸大观霉素溶析结晶二次成核和晶体生长动力学经验方程。
The empirical equations for secondary nucleation and crystal growth kinetics were determined by moment method.
定理表明：辐射型配电网任何逆流路径的二次电流矩等于该路径的功率损失。
The theorem indicates that QCM equals network power loss of the upstream path of the node.
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。
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.
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