特征列

First,the distance ratio between within-class and between-class of each column of mixing matrix is computed by using a distance measurement.Then,for each class,the mixing matrix and independent components are re aligned by sort ascending according to the distance rate,and the columns of the weight matrix with smaller distance ratio and the corresponding features are reserved.Finally,the best feature set is selected by genetic algorithm from these foregoing feature vectors.

首先，使用一种距离度量来计算混合矩阵每一类的类内类间距离比；然后对每一类按该比值由小到大重新排列混合矩阵和独立分量，保留权重矩阵中类间类内距离比大的列，及其对应的特征向量；最后对这些特征向量使用遗传算法选择最优特征组。

Methods The tissue images obtained by ultrasonic examination experienced color conversion with Photoshop, and the corresponding relation between the wavelet coefficient and the local image characteristic after conversion was then analyzed, i.e. the row details in line sequence, the line details in row sequence and the diagonal details in Z sequence.

方法将超声获取的图像组织，再经Fhotoshop技术色彩变换和变换后小波系数与图像局部特征的对应关系进行分析：即行细节按列排序，列细节按行排序，对角线细节按斜Z排序。

MethodsThe tissue images obtained by ultrasonic examination experienced color conversion with Photoshop, and the corresponding relation between the wavelet coefficient and the local image characteristic after conversion was then analyzed, i.e. the row details in line sequence, the line details in row sequence and the diagonal details in Z sequence.

方法将超声获取的图像组织，再经Fhotoshop技术色彩变换和变换后小波系数与图像局部特征的对应关系进行分析：即行细节按列排序，列细节按行排序，对角线细节按斜Z排序。

The paper simplifies the joint diagonalization of matrices into optimization problem which only includes the eigen matrix. For solving the problem conveniently, each row vector of the eigen matrix is parameterized, then utilizes the improved genetic algorithm to get the optimal parameter.

摘要该文首先将矩阵联合对角化问题化简成一个只含有特征矩阵的优化问题，为了便于求解，文中将待求特征矩阵的每一列向量进行参数化处理，并利用改进的遗传算法寻找最优的新参数。

As each source is activated, it generates a wave train that moves downward at a speed determined uniquely by the rock's elastic characteristics.

随着每一个波列源得以被触发，它就产生一个波列，该波列便以一特定速度向下移动，而其下移的速度仅仅取决于岩石的弹性特征。

It is pointed out that the Pacific / North American, the Eurasian , and the North America / Western Europe Patterns comprise the zonally elongated "Seesaw" and wave like structures, while the Asia / North American pattern is dominated by the waveli'ke structure.

结果指出：太平洋/北美型、欧亚型和北美/西欧型由"Seesaw"和波列结构组成，而亚洲/北美型主要呈波列结构，其中"Seesaw"结构及其与西风急流的配置关系、扰动在急流出口区通过正压能量转换从基本气流中获取能量等特征对于夏季北半球遥相关的形成和维持起重要作用。

The polymers substituted with hexyl and octyl on phenylene also show a nematic phase, however, the nematic phase disappears for the polymer substituted with decyl. The polymers substituted with alkoxy on phenylene self-organize into a lamellar structure, and their phase behavior shows obvious dependence on the alkoxy length.

苯环上烷基、烷氧基取代的聚合物都具有纤维状的特征形貌，当烷基、烷氧基碳原子数为6时在高温都存在一个向列液晶相，当烷基碳原子数增加到10时液晶相消失，而烷氧基碳原子数增加到12时该向列液晶相仍然存在。

The characteristic of protargol impregnated specimens was: the single kinety and complex kineties entered the vestibular after they rotated 1.5 coils. the peniculus 3 composed of 3 rows of kineties, of which one near the peniculus 2 was stopped at the joint of peniculus 1 and 3 and the end of the outer row of peniculus 1 had extraversion behavior.

蛋白银制片特征为：单毛基索和复毛基索旋转1.5圈后进入前庭，第3咽膜(P3)起始段由3列毛基索组成，其靠近P2侧的一列毛基索在P1与P3的汇合处终止，P1最外一列的末端外倾。

Stemming from this knowledge, this paper proposes several eigen-analysis-based indices, which are necessary conditions, to estimate the feasibility of islanding control to power systems.

据此，提出基于特征分析的解列可行性判断方法，给出解列可行的3个必要条件，通过对若干典型系统的仿真计算，证明方法的有效性。

This algorithm converts all the existed methods using the multiplier variable approach such as Ritt's algorithm based on Janet division and Wu's algorithm based on Thomas division.

这个算法包含了已有的乘子变量法，例如基于Janet除法的Ritt算法和基于Thomas除法的Wu微分特征列算法。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。