特征参数

Design_by_feature, variational design and parametrical design are some key trends of CAD/CAM technology.

特征设计、变量设计、参数设计是当前CAD/CAM技术的发展方向。

This paper proposed a new type of feature extraction arithmetic for texture image, based on parametrical log polar translation. This arithmetic is robust to geometric distortions.

提出一种细化参数的对数极坐标变换图像纹理特征提取算法，可以有效地消除旋转、缩放和平移等几何形变的影响。

Chapter 1 gives a summary of the parametrical design history, analyses the design_by_feature approach, discusses the representation of dimension and tolerance, and introduces the work done by the author.

作者在研究特征设计、变量设计、参数设计的基础上，开发了一个原型系统—VP系统。本文总结了该系统的设计思想。

We can draw conclusions from the results that in this model we can clearly observe the forming and ending process of pluglike flow and wavelike flow from their 4 -scale wavelet transform charts, and then get smooth oscillograms and detailed oscillograms, it can effectively identify flow regimes accordingly.

小波变换具有可对信号进行时频局部分析、信号局部特征提取和时变滤波等特点。本文通过对信号在不同尺度提取特征值，对气液两相流流型进行判别，从而建立了有效的参数检测软测量模型。

In this paper, SVM is used in classification of polarimetric SAR images based on feature extraction, and effect of several important parameters of SVM on classification performance is analyzed.

该文在极化SAR特征提取的基础上，将SVM应用于极化SAR图像分类，分析了分类器参数对分类性能的影响。

Artificial neural networks have been widely used in sewage purification system simulation and prediction as a promising approach because of their distinguishing features:self-organized,self-adaptive, error-contained and parallel,however the application is still in primar...

人工神经网络具有自组织、自适应、容错性、并行性等显著特征，在活性污泥工艺水质参数模拟与预测方面应用逐渐增多，但应用还不够深入，对网络结构和性能的优化探讨的还比较少，模拟效果不佳。

Through this material one could setup an overall impression of the study content and the study method.In order to investigate the basic heat transfer characteristics of regeneratively cooled scramjet, in the second chapter, one dimensional heat transfer model of regeneratively cooled scramjet was developed. In this model, N-R correlations were used to describe hot gas-side and coolant-side convection heat transfer. Simple model of gas properties was also used.

为了初步了解超燃冲压发动机再生冷却传热的基本特征，第二章建立了超燃冲压发动机再生冷却的一维传热数理模型，采用了准则关系式描述燃气侧和冷却剂侧的对流换热，采用了简化的燃气物性模型，并对衬层材料、衬层厚度和冷却剂流量进行了参数研究。

Thermal-hydraulics design and analysis have been investigated by RELAP 5 code, and pipe optimization, equipments layout and stress analyses have been finished by CAESAR code.

介绍了拟建的高温高压氦气实验回路的主要目标、特征以及回路中各设备的性能、参数，应用RELAP5程序完成了回路的热工设计分析，CAESAR程序优化了管路和设备的布置及应力分析，结果表明设计具备工程可行性。

Considering near field observation and parameter interp retation of source mechanics, the authors think that the low or higt velocity be lts in Tengchong volcano areas are closely related to the magma activities of th e volcanoes.

根据本文成析成象结果，结合数字化近场地震观测资料及震源力学参数特征解释，分析认为，腾冲火山区地壳不同深度存在的低速带或高速带均与火山作用的岩浆活动有密切关系。

Based on the statistic feature of block matching moving vector, the method calculates the basic translation vector between current frame and referenced frame through a revisable parameter, and adaptively chooses processing algorithm for image sources with different characteristics.

该方法从分析块匹配运动矢量统计特性出发，通过引入一个可预设置参数，计算当前帧与参考帧之间的基本平移矢量，并自适应地采取混合全局运动、局部运动估计的算法处理不同特征的源数据。

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。