特征参数

Results showed that fractal dimensions of different disfigurement categories have better distributivity aiming at the mean values and mean square values of nine characteristic quantities,and it was feasible to use feature parameter to describe wood surface disfigurement.

针对这九个特征量的均值和均方差值做了分析，结果表明不同缺陷类别的分形维数有较好的分布性，用这些特征参数描述木材表面缺陷是可行的。

Morphology of small drainage basin is in principle the same as general basins,disregarding its scale.

通过流域特征量的统计，我们看到，与一般流域相比，泥石流小流域的特征参数之间的关系形式上相同，而在数值上不同，这从一个方面肯定了流域演化存在着普遍规律，同时也证明泥石流是流域演化历史的"特殊一幕"。

For Mode III problems,the local nonhomogeneity of interlayer and thedistribution parameter determine the stress intensity factor and strain energy releaserate.

对于III型问题，界面层材料局部非均匀性及分布特征参数反映了应力强度因子和应变能释放率的特征。

Firstly, Dempster-Shafer is developed by not only considering the certainty of the evidence, but also considering the average support of the evidence to different subsets in the assignment framework so that it can give more reliable combination result. Secondly, amplitude ratio feature and Euclid distance of the probability density distribution function in Pearson graph from different temporal SAR images are extracted to present change feathers in different scales. Finally, the improved Dempster-Shafer algorithm is applied to fuse the two different features to detect change information of SAR images.

首先通过综合考虑证据本身的确信度和证据对辨别框架中子集的平均支持度进行证据间的加权合成，改进证据理论对证据的合成，提高其可靠性；然后提取不同时相图像间的散射幅度的对比度和概率密度分布函数在皮尔逊图中的欧式距离，两种特征参数代表了像元级和区域级不同空间尺度下微波遥感图像中关于地表变化的信息；最后将改进的证据理论用于两特征之间的融合处理，得到地表的变化信息。

Then according to the characteristic of LFMCW fuze signal,the characteristic parameter is extracted based on periodic ambiguity function.

该方法首先对侦察接收到的信号作二维自相关变换，分析LFMCW引信信号的周期模糊函数特征，然后结合LFMCW引信信号本身的特性，在相关域提取LFMCW引信信号的特征参数。

The results showed that the coefficient of raicel decreased firstly in a short distance, and then kept stable form radicel base to radicel apical.

通过对胚根分支系数研究表明：从根基部到根尖，呈现出先递减，然后保持稳定的趋势，采用经验分布函数表示；同时，用四种分支类型已能描述玉米胚根分支特征，且它们的特征参数在一定范围内随机分布。

Classify glass defect by computing rotundity degree and slightness degree as characteristic vector.

最后针对分割图像，提取缺陷目标的面积和周长等特征参数，计算出图像中缺陷的圆形度和伸长度指标，组成特征矢量来对缺陷种类进行识别分类，为进一步的优化玻璃切割系统提供详尽的数据。

When studying the fractal characteristics of natural textures, this dissertation introduces a new parameter named fractal scale.

在研究自然纹理图像的分形特征时，本论文定义一种新的特征参数——分形尺度，提出了计算分形尺度的截距线性度法。

Species richness and diversity of arborous layer were higher than herbaceous layer but lower than shrub layer in various vegetations except deciduous broad-leaved forest at vertical structure.

从群落特征参数值来看，人为干扰对植物群落特征和结构造成了一定的影响，同种干扰类型下，平均树高、平均胸径、立术密度等表现出相似的规律。

Because of the existence of natural detecting blind area o f general radar on detecting flying object flying in veryˉ low altitude, it is so essential to put forward a suspended bomb t heory which would make use of sound wave's characˉ teristic parameters as its wavelength and spectrum to get the obje ct's direction and position, and to discuss its orientaˉ tion method and embattle model.

由于现有的常规雷达探测超低空飞行的来袭兵器有其固有的盲区，作为雷达的必要补充，利用声音的大小、频谱等特征能够反映声源的方位等特征参数的特性，提出了一种被动声学探测悬浮弹理论，并对其定位算法和布阵模式进行探讨，目的是防御拦截低空超声速巡航导弹。

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。