特征方向

A new method for filtering out singular points in damped harmonic vibration signal;2. Region of interest of a fingerprint image is extracted according to the position and direction of the singular points .

该算法根据奇异点的位置和方向，提取指纹图像的感兴趣区域，并使用二维主成分分析(2DPCA)的方法进行统计特征的提取和识别。

The results show that: the general variable trend of its spatial structure is of deconcentration,and the factors,including economic development,the change of industrial layout,the transformation of management policies of the port system,the dema...

鉴于此，运用模糊聚类、货种区位商等分析技术，对其体系内的港口等级层次、职能结构的基本特征进行探讨，并在此基础上提出了各港口职能分工的发展方向。

The distribution of the sedimentary microfacies of each sublayer of Chang 6 reservoir is studied, It is concluded that the hydrocarbon accumulation is controlled by sedimentary microfacies. The subaqueous distributary channel of delta front and distributary channel of delta plain are the most favorable facies belts for reservoir distribution and development.

同时对长6油层组各小层沉积微相的时空展布特征进行了分析，认为油气聚集受沉积微相的控制，三角洲前缘亚相的水下分流河道微相和三角洲平原亚相的分流河道微相是砂岩储层分布和发育的最有利相带，也是今后勘探开发的方向。

In this precondition, Digital Library should carry on the building of digital resources and digital services designedly and cooperatively.

本文旨在通过I以S的发展历程，分析中国图书馆信息化建设各个阶段的基本特征，从而对图书馆信息化建设的未来发展方向提出参考

In view of the usual vertical-horizontal elastic mesh's shortage in left falling stroke and right falling stroke, we present a new elastic mesh structure method—diagonal elastic mesh, which is composed of diagonal beelines of and , and divides the Chinese character image into many diamonds.

针对通常的纵横弹性网格对汉字"撇、捺"笔画特征提取的不足，提出一种新的网格构造技术——对角弹性网格，它由45°和135°的对角直线构成，将汉字图像划分为多个菱形，能够很好地适应汉字在"撇、捺"方向的变化。

In diatropism the plant part is orientated at right angles to the direction of the stimulus.

植物的具横向性特征的部分，其生长方向同刺激成直角。

Identification based on the human fingerprint is an important research direction in pattern recognition field.

中文摘要：基于人体指纹特征的身份识别是模式识别领域中的一个重要研究方向。

The fractures of marlite, sandstone, faults and the disconformity between Sha San member and Sha Er member are three main conduit systems. For this low maturity of the oil kitchen, The fractures of marlite that coexist with source rock might as well be an important bridge to link oil kitchen and reservoir.

通过对德南洼陷输导体空间分布及物性特征分析，揭示并论证了本区特殊的输导层主要是与源岩共生的泥灰岩、泥质白云岩及白云岩中的裂缝系统，为进一步寻找有关油气藏指出方向。

Compared with the traditional discrete wavelet transform, the dual tree complex wavelet transform has the properties of approximate shift invariance and more directionality. These properties are good for tracing, locating and preserving image features.

与常用的离散小波变换相比，该方法具有逼近的平移不变性和更多的方向选择性，有利于特征的跟踪、定位和保留。

The contourlet transform used in the system was constructed by dual tree complex wavelet transform followed by critically subsampled directional filter banks, sub-bands energy and standard deviations were cascaded to form feature vectors, and the similarity metric was Canberra distance. The performance of retrieval system was compared including original contourlet transform, non-subsampled contourlet transform, semi-subsampled contourlet transform and CCT under the same system structure.

该系统采用的复数轮廓波变换由双树复小波变换级联临界下采样方向滤波器构成，特征向量采用子带系数的能量和标准偏差连接而成，以Canberra距离为相似度度量标准；比较了基于同样架构的基本轮廓波变换、无下采样轮廓波变换、半下采样轮廓波变换和CCT纹理检索系统的性能。

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。