Circuit implementation and multiform intermittency in ahyper-chaotic model extended from Lorenz system

<正>This paper presents a non-autonomous hyper-chaotic system,which is formed by adding a periodic driving signal to a four-dimensional chaotic model extended from the Lorenz system.The resulting non-autonomous hyper-chaotic system can display any dynamic behaviour among the periodic orbits,intermittency,chaos and hyper-chaos by controlling the frequency of the periodic signal.The phenomenon has been well demonstrated by numerical simulations,bifurcation analysis and electronic circuit realization.Moreover,the system is concrete evidence for the presence of Pomeau-Manneville Type-Ⅰintermittency and crisis-induced intermittency.The emergence of a different type of intermittency is similarly subjected to the frequency of periodic forcing.By statistical analysis,power scaling laws consisting in different intermittency are obtained for the lifetime in the laminar state between burst states.     

纯交换经济环境中的双人贝叶斯机制研究

将Dutta和Sen(1994)关于不完全信息环境中二人贝叶斯执行问题扩展到纯交换经济环境中,建立了纯交换经济的双人贝叶斯机制模型,给出当偏好关系和初始禀赋都是不完全信息环境下,一个社会选择规则贝叶斯可执行的充分条件和必要条件.     

Micromorphic continuum. Part III: Small deformation plasticity coupled with damage

Properties of the micromorphic theory proposed in Part II are discussed for the case of small deformations. Model responses for beam specimens under bending loading and plates with circular holes under tension loading are calculated by employing the finite element method. The results reported are concerned with the capabilities of the theory to predict size effects.     

A novel one equilibrium hyper-chaotic system generated upon Lü attractor

By introducing an additional state feedback into a three-dimensional autonomous chaotic attractor Lü system, this paper presents a novel four-dimensional continuous autonomous hyper-chaotic system which has only one equilibrium. There are only 8 terms in all four equations of the new hyper-chaotic system, which may be less than any other four-dimensional continuous autonomous hyper-chaotic systems generated by three-dimensional (3D) continuous autonomous chaotic systems. The hyper-chaotic system undergoes Hopf bifurcation when parameter c varies, and becomes the 3D modified Lü system when parameter k varies. Although the hyper-chaotic system does not undergo Hopf bifurcation when parameter k varies, many dynamic behaviours such as periodic attractor, quasi periodic attractor, chaotic attractor and hyper-chaotic attractor can be observed. A circuit is also designed when parameter k varies and the results of the circuit experiment are in good agreement with those of simulation.     

嵌入式电子节能控制器的设计与实现

节能控制能够有效降低能耗,对保护环境等方面具有重要影响。但目前大多数电子节能控制器都是通过采用单片机技术和双向晶闸管过零触发交流调压电路对电子节能控制器进行设计。通过介绍电子的负荷特点和节能原理,分析电子节能控制器的硬件组成电路,并对电子节能控制器的主要软件程序的流程图进行设计,完成电子节能控制器设计。但这种方法节能控制效果较低,难以保证电子节能控制器性能,为此,提出一种基于模糊PID控制的嵌入式电子节能控制器设计与实现方法。首先通过对嵌入式电子节能控制器的处理器、电源电路、复位电路、系统时钟电路、JTAG接口电路、D/A转换电路、功放电路、双极性电源电路以及嵌入式电子节能控制器硬件PCB板器件布局等的设计,完成嵌入式电子节能控制器硬件设计。在此基础上,选用模糊PID控制方法对嵌入式电子节能控制器进行设计。通过分析模糊PID控制原理,介绍加入自调节因子的模糊PID控制的算法设计,以此确定输入输出隶属度函数,再利用模糊推理和模糊规则,得到电子节能控制器的模糊控制过程,从而完成嵌入式电子节能控制器的设计。实验证明,所提方法能够有效提高嵌入式电子节能控制器的节能控制效果,具有良好的使用价值。     

Complexity analysis and numerical implementation of a short-step primal-dual algorithm for linear complementarity problems

In this paper we deal with the study of the polynomial complexity and numerical implementation for a short-step primal-dual interior point algorithm for monotone linear complementarity problems LCP. The analysis is based on a new class of search directions used by the author for convex quadratic programming (CQP) [M. Achache, A new primal-dual path-following method for convex quadratic programming, Computational and Applied Mathematics 25 (1) (2006) 97-110]. Here, we show that this algorithm enjoys the best theoretical polynomial complexity namely , iteration bound. For its numerical performances some strategies are used. Finally, we have tested this algorithm on some monotone linear complementarity problems.     

基于小波分析的高斯脉冲成形的递归实现

基于小波分析的指数衰减信号高斯脉冲成形滤波器,可以进一步表示为高斯函数及其导数的线性组合.以高斯函数及其导数的递归近似实现算法为基础,研究了基于小波分析的指数衰减信号高斯脉冲成形的递归近似实现算法.仿真指数衰减信号和实际采样指数衰减信号的高斯脉冲成形表明,递归近似高斯脉冲成形与直接卷积高斯脉冲成形符合得非常好,体现了基于小波分析的高斯脉冲成形的特点.研究成果为进一步研究高斯脉冲成形在数字芯片上的实现提供了必要的数字算法基础. 关键词： 高斯脉冲成形 递归实现 小波分析     

Generating multi-scroll chaotic attractors by thresholding

This Letter proposes a novel thresholding approach for creating multi-scroll chaotic attractors. The general jerk circuit and Chua's circuit with sine nonlinearity are then used as two representative examples to show the working principle of this method. The controlled jerk circuit can generate various limit cycles and multi-scroll chaotic attractors by tuning the thresholds and the width of inner threshold plateau. The dynamic mechanism of threshold control is further explored by analyzing the system dynamical behaviors. In particular, this approach is effective and easy to be implemented since we only need to monitor the threshold variables or their functions and then reset them if they exceed the desired thresholds. Furthermore, two simple block circuit diagrams with threshold controllers are designed for the implementations of 1, 2, 3-scroll chaotic attractors. It indicates the potential engineering applications for various chaos-based information systems.     

OFDM水声通信实时处理系统的多处理器并行

OFDM(正交频分复用)充分利用频带,具有较高的数据传输速率;ADSP-TS101是具有高速并行处理能力的高性能数学信号处理芯片。针对OFDM水声通信的实时处理要求,本文设计并研制了具有实时处理能力的水声通信系统。该系统包括由多片ADSP-TS101构成的松/紧联合耦合的并行处理结构作为处理核心、无相位偏差的多通道同步采样模块和FPGA(现场可编程门阵列)逻辑控制模块。湖上实验结果表明该系统具有良好的稳定性和实时处理能力,满足工程设计要求。     

一个新四维非自治超混沌系统的分析与电路实现

在以Lorenz系统为基础的一个新超混沌系统上,加入一个驱动信号,组成了一个四维非自治超混沌系统.该系统基本动力学特性的变化,主要是通过控制外界输入信号的频率实现的.在不同的频率参数下,该系统体现出了周期轨、二维环面、混沌以及超混沌不同的动力学特性,其中周期轨特性较为显著.这个现象在数值仿真以及分形分析上得到了很好地验证.最后设计一个模拟电路,通过实验结果进一步验证了与数值仿真的一致性.