CAXA电子图版中的尺寸驱动

计算机绘图软件如AutoCADR14,CAXA电子图版等,它们中都有尺寸编辑功能——尺寸驱动,它给图形的规整和修改带来很多方便,但CAXA电子图版中的"尺寸驱动"仍存在着许多缺陷。     

基于D-S 理论的目标识别

利用目标回波所提供的信息 ,在 D- S理论的基础上 ,综合利用各种目标识别方法进行目标识别 ,在很大程度上提高了目标识别率及识别结果的可信度 ,且有更好的目标分类效果。     

一种新的“相对论”导出方法

本文从狭义相对论的基本原理出发,建立了满足光速不变原理和相对性原理的四维运动坐标系（倾斜坐标系）,从而导出狭义相对论的主要内容和基本结论．     

弱总体维数为1的局部环

讨论了具有弱总体维数为1的局部环的一些性质,并证明了一类环是弱总体维数为1的局部环．     

分形中的局部维数及其动力学方程

提出了局部维数的概念,并在对Ｈａｕｓｄｏｒｆ维数推广的基础上推导出局部信息维数及局部填充维数与维数ｎ及概率密度的关系,进而推导出了经典分形场的动力学方程及量子体系分形场方程,从而有效地诠释了一些自然现象及生物现象中存在自相似结构的动力学机制。     

多目标模糊优选法及其在船舶主尺度优选中的应用

介绍了基于相对隶属度和相对隶属度函数的模糊优选模型,首次引入目标对决策的影响度因子的概念,对目标相对优属度公式进行改进,通过该模型在船舶主尺度优选中的应用,证明新模型较诉模糊综合评判方法具有更大的优越性。     

Reconstructing the state space of chaotic BZ reaction system using power spectrum method

The BZ reaction in continuous-flow stirred tank reactor (CSTR) is selected, and the chaotic time series in low CSTR flow rates have been achieved. The power spectrum method (PSM) from physics and mathematics is introduced to compute the time delayT, the embedded dimensionm so as to reconstruct the state space of the chaotic BZ reaction system by the time delayed coordinates. Further analysis and characterizations on the reconstructed chaotic attractor show that the results are in agreement with the references. It indicates that PSM is faster, simpler and reliable for processing the chaotic chemical system.     

Fractal analysis for root growth of plant seedlings under doubled CO2 concentration

Fractal geometry was applied and box dimension was used as an indicator to analyze the effects of doubled CO₂ concentration on the root growth of plant seedlings. Results showed that doubled CO₂ concentration displayed different effects on root branching characteristics of C₃ and C₄ plants. There was an obvious increase of root branches in spring wheat while there were no significant effects on roots of sweet sorghum. In different soil layers, root branching of spring wheat was stimulated and this promotion was most significant in the second layer (10–20 cm), which denoted that elevated CO₂ altered the root branching pattern. That means higher CO₂ concentration influences not only root growth but also its differentiation and development.     

Net measure properties of Moran sets and applications

The Hausdorff and packing dimensions for a class of Moran sets are obtained.     

豫北地区城镇体系演化特征的R/S分析

运用分形理论和Ｒ／Ｓ分析方法讨论了豫北地区城镇体系的演化特征。研究区内的城市人口,产值,规模分布的分维等指标的Ｈｕｒｓｔ指数都大于０．５,但数值有差异。