组合方法

Using the linear combination of normal probability density functions to fit histograms of mean durations, it has the advantage of visualigation.

该方法用多正态密度函数（正态密度函数的线性组合）拟合平均持续时间的直方图，具有可视性的优点。

This method first calculates joint probability distribution of any two images,and then calculates the normalized mutual information according to it.All the normalized mutual information of two images forms a vector,the normalized mutual information vector.

这种方法先计算任意两幅图像间的联合概率分布，然后根据联合概率分布计算它们间的归一化互信息，把所有两幅图像组合得到的归一化互信息组成一个向量，最后计算该归一化互信息向量的熵。

An input phase voltage is divided into a main range and a transition range in which new P, M, N conditions and PM, NP, MN transition conditions are defined, some null vector is selected and the condition combination sequence of bidirectional power switches are adjusted in each modulation period to realize the safe, reliable and rapid commutation and the stable operation of the matrix converter.

本发明属于矩阵变换器控制技术，为一种用于矩阵变换器的控制方法，通过把输入相电压划分为主区间和过渡区间、在过渡区间定义新的P、M、N状态和PM、NP、MN暂态以及在每个调制周期内选择特定的零矢量并调整双向功率开关状态组合顺序，实现矩阵变换器安全、可靠、快速换流和稳定运行。

But there are a few of methods of interval number linear programming for the portfolio investment.

本文作者主要采用区间数线性规划方法研究不确定型的证券组合投资问题。

At present, many interval and foreign scholars all study interval number linear programming problem .

区间数线性规划问题是目前研究的热点问题之一，但有关证券组合投资的区间数线性规划方法较少。

To develop the missile quasi-linear model, a state space model is established for missile dynamics, and function substitution method is used to describe the nonlinear dynamics of missile as linear combinations of functions of given time-varying parameters. With the minimizing variation range of model parameters over the whole design envelope as the optimum aim, linear programming optimum arithmetic is used to determine the model parameters at selected grid points.

为了建立导弹准线性化模型，将导弹动力学描述为状态空间形式；采用函数替换方法将导弹的非线性动力学描述为关于特定时变参数的函数的线性组合形式；以整个设计区间内模型参数变化范围最小为优化目标，采用线性规划优化算法确定了所选网格点上的模型参数。

Using combinatorial thoughts and topological methods,a closed curve system that contains the most number of non-contractible,pair-wise disjoint and pair-wise non-homotopic closed curves on the orientable surface is investigated.

利用组合数学的思想、拓扑的方法研究在可定向曲面上，一类含有个数最多的不可收缩的、两两不相交、互不同伦的圈系统及其性质，得出了关于这些圈的一些拓扑定性性质，并给出这些圈在曲面上的位置分布。

As we know, modified duration is one of the methods to measure a bond portfolio's sensitivity to a parallel shift in the yield curve.

我们知道，修正期限是用来衡量债券组合对收益率曲线平行移动的敏感性的一种方法。

Key Rate Duration As we know,modified duration is one of the methods to measure a bond portfolio＇s sensitivity to a parallel shift in the yield curve.

关键利率久期我们知道，修正久期是用来衡量债券组合对收益率曲线平行移动的敏感性的一种方法。

Using hybrid CSG/Brep representation, the whole solid model is a CSG tree made of leaf nodes with basic Brep, which include triangular mesh, subdivision surface control mesh and basic geometries with parametric representation.

该方法采用混合CSG/Brep表示，实体模型在整体上用CSG树表示，整个模型为基本边界表示的叶节点的组合，叶结点可以是三角网格、细分曲面控制网格或参数表示的基本几何体。

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。