Adaptive generalized matrix projective lag synchronization between two different complex networks with non-identical nodes and different dimensions

<正>The adaptive generalized matrix projective lag synchronization between two different complex networks with non-identical nodes and different dimensions is investigated in this paper.Based on Lyapunov stability theory and Barbalat’s lemma,generalized matrix projective lag synchronization criteria are derived by using the adaptive control method.Furthermore,each network can be undirected or directed,connected or disconnected,and nodes in either network may have identical or different dynamics.The proposed strategy is applicable to almost all kinds of complex networks.In addition,numerical simulation results are presented to illustrate the effectiveness of this method,showing that the synchronization speed is sensitively influenced by the adaptive law strength,the network size,and the network topological structure.     

离子色谱法同时测定蛋白胨中氯离子、硫酸根离子、碘离子

建立离子色谱法测定蛋白胨中氯离子、硫酸根离子、碘离子3种阴离子的含量。采用氢氧化钾淋洗液发生器产生的KOH溶液为流动相,进行梯度淋洗,流量为1.0 mL/min。氯离子、硫酸根离子的质量浓度分别在0.5～200μg/mL范围内与色谱峰面积呈良好的线性关系,碘离子的质量浓度在0.75～50μg/mL范围内与色谱峰面积呈良好的线性,线性相关系数均不小于0.999,检出限分别为0.003,0.01,0.22μg/mL。样品加标回收率为92.94%～96.59%,测定结果的相对标准偏差为2.42%～5.70%(n=9)。该方法灵敏、高效,可用于蛋白胨中氯离子、硫酸根离子、碘离子的快速准确测定。     

PSO优化LS-SVM在模拟电路故障预测中的应用

针对模拟电路故障预测的特点,提出一种基于PSO优化LS-SVM惩罚因子和核参数的模拟电路故障预测方法。利用小波包分解重构构造能量特征向量,通过计算PPMCC和欧氏距离来表征电路中元件的健康程度,定义为健康度,由此推导出电路发生故障时该元件的故障阈值。应用PSO优化的LS-SVM模型来实现模拟电路的故障预测,预测各个时间点的健康度变化轨迹并估计模拟电路的剩余寿命。通过仿真实验得知,该方法简单便捷,能够有效实现模拟电路的故障预测,具有较好的实用性。     

The synchronization of a fractional order hyperchaotic system based on passive control

This paper investigates the synchronization of a fractional order hyperchaotic system using passive control. A passive controller is designed, based on the properties of a passive system. Then the synchronization between two fractional order hyperchaotic systems under different initial conditions is realized, on the basis of the stability theorem for fractional order systems. Numerical simulations and circuitry simulations are presented to verify the analytical results.     

Experimental Confirmation of a Modified Lorenz System

We experimentally demonstrate the butterfly-shaped chaotic attractor we have proposed before lint. J. Nonlin. Sci. Numerical Simulation 7 （2006） 187]. Some basic dynamical properties and chaotic behaviour of this new butterfly attractor are studied and they are in agreement with the results of our theoretical analysis. Moreover, the proposed system is experimental demonstrated.     

基于ARM Cortex-M3的某新型装备信息采集系统设计

根据某新型装备特点,介绍了一种基于ARM Cortex-M3和SD卡的数据采集系统的硬件设计和软件设计。硬件部分包括信号调理电路、微控制器外围电路和SD卡接口电路三个方面。其中微控制器是基于ARM Cortex-M3微处理器设计的STM32F205VG,本设计采用微控制器自带的ADC模数转换器完成模数转换。软件部分包括系统软件和应用软件两部分,其中系统软件主要有主程序模块、初始化程序模块等;应用软件主要有信息采集、SD卡读写程序等。本系统设计采用ARM微处理器,充分利用了ARM的低功耗、高效率、体积小的优点,具有广泛的应用前景。     

隧道下穿地铁拟换乘车站施工监测与安全分析

隧道下穿地铁既有车站为重大风险工程，下穿拟换乘车站时更应进行严格的风险评估与控制，以保证工程施工前后地铁车站的安全运营。本文主要就某新建隧道下穿北京地铁拟换乘车站万寿路站的风险评估和第三方监测进行研究。新建隧道施工可诱发既有车站结构的沉降，造成车站轨道过量变形，进而影响地铁安全运营，本工程采用了结构检测、施工影响模拟预测和第三方监测等工程风险评估和控制手段，结果表明万寿路站受隧道施工影响较小，地铁运营未受影响。     

硫脲树脂富集-电感耦合等离子体质谱法测定地质样品中的超痕量金、银、铂、钯

研究了硫脲树脂富集，ICP-MS同时测定地质样品中超痕量金、银、铂、钯的方法。确定了仪器的最佳条件，并从吸附酸度、时间、树脂用量、解脱条件、干扰情况等方面进行了详细的考察。方法的检出限（3a）分别为Au：0．1lng／mL；Ag：0．35ng／mL；Pt：0．095ng／mL；Pd：0．08ng／mL。方法的RSD为（n=12）Au4．1％、Ag2．1％、Pt3．1％、Pd3．8％。测定了国家一级地球化学标准物质中的痕量Au、Ag、Pt、Pd，结果与标准值相吻合。     

A general method for synchronizing an integer-order chaotic system and a fractional-order chaotic system

This paper investigates the synchronization between integer-order and fractional-order chaotic systems.By intro-ducing fractional-order operators into the controllers,the addressed problem is transformed into a synchronization one among integer-order systems.A novel general method is presented in the paper with rigorous proof.Based on this method,effective controllers are designed for the synchronization between Lorenz systems with an integer order and a fractional order,and for the synchronization between an integer-order Chen system and a fractional-order Liu system.Numerical results,which agree well with the theoretical analyses,are also given to show the effectiveness of this method.     

A new four-dimensional hyperchaotic Lorenz system and its adaptive control

Based on the Lorenz chaotic system, this paper constructs a new four-dimensional hyperchaotic Lorenz system, and studies the basic dynamic behaviours of the system. The Routh--Hurwitz theorem is applied to derive the stability conditions of the proposed system. Furthermore, based on Lyapunov stability theory, an adaptive controller is designed and the new four-dimensional hyperchaotic Lorenz system is controlled at equilibrium point. Numerical simulation results are presented to illustrate the effectiveness of this method.