阶矩

As there is not finite second order moments in alpha stable noise,the least square propagator cannot be used.

由于在α稳定分布噪声的环境下不存在有限的二阶矩，因此采用最小二乘方法来求解传播算子的算法将不再适用。

Considering the characters of the waveform of impulsive noise, on the base of robust statistics, the thesis uses the robust statistical function mending the customary adaptive algorithm based on second order statistic, applies it to the system identification problem.

考虑到α-稳定分布波形的性质，在稳健估计理论的基础上，利用稳健估计函数改进了原有的基于二阶矩的自适应算法。

Then based on the second-order moment method, the closed-form expression of the beam width is obtained, and the beam waist width and waist location for elegant cosh square Gaussian and Sinh square Gaussian beams are also deduced.

基于二阶矩定义，分别推导了复宗量双曲余弦平方-高斯光束和双曲正弦平方-高斯光束的光斑尺寸、束腰宽度及其位置，并对结果作了详细的分析和讨论。

The objective of this study is to investigate systematic risk in asset pricing with higher moments, especially for skewness and ku...

本研究的目的，在于探讨偏态与峰态等高阶矩系统风险对资产定价的影响。

By introducing the NCP function, the KKT conditions of POPF system are transformed equivalently. Based on the transformed nonsmooth nonlinear algebraic equations, the FOSMM is used to determine the POPF model expressed by the numerical characteristic of variables. The model includes nonsmooth functions, so it can be solved by a semismooth L-M method based on the subdifferential.

将概率最优潮流表述为随机非线性规划问题后，利用非线性互补函数将该问题的KKT条件进行转化，基于转化后的非线性代数方程组，利用一次二阶矩法确定了以待求量的数字特征表示的概率最优潮流模型，由于该模型包含不光滑函数，因此采用基于次微分的半光滑L-M方法求解。

In the POPF model, wind farm is modeled by the probabilistic wind farm model considering the reactive power-slip characteristic, and the inequality constraints include not only the unit output constraints, the ratio constraints, the voltage constraints and the line current constraints but also the reactive compensation capacity constraints in wind farm and the system climbing capacity constraints per minute. By introducing the NCP function, the KKT conditions of POPF system are transformed equivalently. Based on the transformed nonsmooth nonlinear algebraic equations, the FOSMM is used to determine the POPF model expressed by the numerical characteristic of variables. The model includes nonsmooth functions, so it can be solved by a semismooth Newton-type method based on the subdifferential.

概率最优潮流模型中，风电场采用考虑无功功率—滑加热器差特性的风电概率模型，不等式约束中除了机组出力约束、有载调压变压器变比约束、电压约束和支路电流约束，也考虑了风电场无功补偿容量约束、系统的分钟级爬坡能力约束；使用非线性互补函数将概率最优潮流的KKT条件转化为一组包含有不光滑函数的非线性代数方程组，然后基于一次二阶矩法确定了以待求量的数字特征表示的POPF模型，由于该模型包含不光滑函数，因此采用基于次微分的半光滑牛顿型方加热器法求解。

In this paper,the problem of the rate of uniform convergence in the normal approximations of the Von Mises Statistics will be considered.

本文讨论了Von Mises统计量向正态逼近的一致收敛速度问题，在核函数仅满足二阶矩条件下，给出了上述收敛速度的上、下界，所得结果改进了 [2 ]中相应结论

Part Ⅰ: Since the study about breaking onset criteria base on the downward acceleration or on the wave slope shows great discrepancy, the models that estimating breaking probability and whitecap coverage according to these two criteria are problematic.

第一部分：因所采用的动力学或波陡判据的不确定性和海浪谱四阶矩的难以确定，现已提出的关于风浪破碎率和白浪覆盖率的统计模式有一定的不确定性。

Firstly, the geometrical structure of the target is approximated by bilinear surface technology. Then, surface integral equations are formed. Finally, simulation calculation to representative dielectrically completely coated targets is conducted. Compared the high order MoM results with the results of literatures, good agreement is found between them.

建立目标的双线性表面几何模型，基于等效原理建立表面电磁积分方程，以典型的完全涂敷目标为例，采用高阶矩量法进行仿真计算。

Based on the second order moment method recommended in ISO11146 international standard,the facular of the sender after focused by using CCD can be measured and divided into several parts to get the factor M2 of the sender of laser fuse.

以ISO11146标准中的二阶矩法为基础，使用CCD采集聚焦后的光斑图像，并对光斑图像进行分块处理，从而得到激光引信发射组件的M2因子。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。