气固流化床中非线性特性的多尺度分析

Deterministic chaos theory offers useful quantitative tools to characterize the non-linear dynamic behavior of a fluidized bed and the developed complexity theory presents a new approach to evaluate finite sequences. In this paper,the non-linear,hydrodynamic behavior of the pressure flutuation signals in a reactor was discussed by chaos parameters and complexity measures.Coherent results were achieved by our multi-scale analysis,which further exposed the behavior in a gas-solid two-phase system.     

伴有生物质热解的流化床中的混沌传递现象

Experiments of biomass pyrolysis were carried out in a fiuidized bed, and dynamic signals of pressure and temperature were recorded. Correlation dimension was employed to characterize the chaotic behavior of pressure and temperature signals. Both pressure and temperature signals exhibit chaotic behavior, and the chaotic behavior of temperature signals is always weaker than that of pressure signals. Chaos transfer theory was advanced to explain the above phenomena. The discussion on the algorithm of the correlation dimension shows that the distance definition based on rhombic neighborhood is a better choice than the traditional one based on spherical neighborhood. The former provides a satisfactory result in a much shorter time.     

颗粒流体系统的流域特性及其混沌行为

应用混沌动力学方法研究了颗粒流体系统的流域特性以及流域之间的过渡，从奇异吸引子图及波动频率、平均绝对偏差（ＡＡＤ）、Ｋｏｌｍｏｇｏｒｏｖ熵（Ｋ）和相关维数（Ｄ）等动力学参数的角度出发，论证了系统随气速增大依次出现颗粒控制的固定床（Ｐａｒｔｉｃｌｅ－Ｄｏｍｉｎａｔｉｎｇ，ＰＤ）、颗粒流体协调的流化床（Ｐａｒｔｉｃｌｅ－Ｆｌｕｉｄ－Ｃｏｍｐｒｏｍｉｓｉｎｇ，ＰＦＣ）和流体控制的稀相输送（Ｆｌｕｉｄ－Ｄｏｍｉｎａｔｉｎｇ，ＦＤ）等不同流域，讨论了流域之间的过渡。     

混沌理论的起源与动力系统研究

本文讨论了混沌概念和混沌理论研究的历史渊源，混沌的哲学意义，以及在数学上与混沌相对应的动力系统的研究历史情况。     

煤炭需求量预测非线性动力学模型

突破传统分析方法，引入浑沌分析，对煤炭需求量演规律进行探索，以煤炭需求量时间序列数据为基础，从非线性动力学观点出发，研究其所蕴含的动力学特征。求解描述该系统的相空间特征及其吸了，建立煤炭需求量预测非线性动力学模型，采用Ｋｏｌｍｏｇｏｒｏｖ熵分析给出煤炭需求量确定性预测的时间尺度。     

第六届磁流体国际会议学术论文综述

综合评述了磁流体的制作和性能研究以及磁流体技术在生物医学等领域的应用．介绍了磁流体液晶复合材料、磁流体的浑沌状态和表面奇异现象等一些新颖的研究工作．     

Willis环状脑动脉瘤生物数学模型的分枝与浑沌

本文对G.Austin模拟脑动脉瘤的实验进行讨论,归结出脑动脉瘤的一个生物数学模型,再用Melnikov方法研究了模型的周期扰动系统的次谐波分枝和浑沌行为,最后,讨论了其对动脉瘤的影响。     

具有Sinα—bsin2α非线性项的动力系的混沌阈

利用Ｇ．Ｃｉｃｏｇｎａ的改进的Ｍｅｌｎｉｋｏｖ方程，研究了具有ｓｉｎα－ｂｓｉｎ２α非线性项的动力系的混沌阈值，并进行了数值计算。