Brain oscillatory activity during motor imagery in EEG-fMRI coregistration

The purpose of the present work was to investigate the correlation between topographical changes in brain oscillatory activity and the blood oxygenation level-dependent (BOLD) signal during a motor imagery (MI) task using electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) coregistration.     

一汽轿车的发展及其对吉林省经济发展的影响

通过对吉林省一汽轿车股份有限公司的发展现状、影响一汽轿车市场发展的有关因素的描述和分析，阐明了一汽轿车的发展对吉林省经济发展的作用，并对未来十年一汽轿车的发展对吉林省经济发展所产生的影响进行了预测和分析。     

永磁同步电动机混沌系统的控制研究

采用自适应控制方法对永磁同步电机混沌系统进行控制研究,当该混沌系统参数未知时,基于Lyapunov稳定性理论,设计了相应的控制器和参数自适应律,使系统的状态控制到任意一个不稳定平衡点,并运用Barbalat引理,在理论上证明了受控系统的渐进稳定性,从而消除了混沌,仿真结果证明了该方法的有效性.     

基于DSP技术的无位置传感器的无刷直流电动机控制

主要介绍对于基于DSP技术的无位置传感器的无刷直流电动机控制系统设计，重点介绍了如何采用单电阻检测相电流和转子位置估算的问题，同时，对于无刷直流电动机的启动控制也提出了解决方案。     

分数阶同步磁阻电机的混沌与控制

利用分数阶Caputo微分及其理论,讨论了分数阶同步磁阻电机的混沌及其控制问题.首先利用分岔图、最大Lyapunov指数以及相图和时序图,分析了分数阶同步磁阻电机的混沌特性,研究了阶次对混沌行为的影响,得出同量分数阶系统出现混沌运动的最低阶次约为2.94.其次基于分数阶系统的稳定性理论,构造Lyapunov函数,设计合理的控制器,使其达到全局渐进稳定.最后通过数值仿真验证了该方法的有效性.     

多步进电机控制算法研究

采用单台PC机，也就是用单CPU，代替多个CPU控制多个步进电机。根据步进电机工作的特性曲线，计算出单个步进电机运行的时间控制数组，然后把多个步进电机的相对时问控制数组合并成为一个相对时间控制结构数组，利用此一个相对时间控制数组同时对多个步进电机进行控制。     

Stochastic mechano-chemical kinetics of molecular motors: A multidisciplinary enterprise from a physicist’s perspective

A molecular motor is made of either a single macromolecule or a macromolecular complex. Just like their macroscopic counterparts, molecular motors “transduce” input energy into mechanical work. All the nano-motors considered here operate under isothermal conditions far from equilibrium. Moreover, one of the possible mechanisms of energy transduction, called Brownian ratchet, does not even have any macroscopic counterpart. But, molecular motor is not synonymous with Brownian ratchet; a large number of molecular motors execute a noisy power stroke, rather than operating as Brownian ratchet. We review not only the structural design and stochastic kinetics of individual single motors, but also their coordination, cooperation and competition as well as the assembly of multi-module motors in various intracellular kinetic processes. Although all the motors considered here execute mechanical movements, efficiency and power output are not necessarily good measures of performance of some motors. Among the intracellular nano-motors, we consider the porters, sliders and rowers, pistons and hooks, exporters, importers, packers and movers as well as those that also synthesize, manipulate and degrade “macromolecules of life”. We review mostly the quantitative models for the kinetics of these motors. We also describe several of those motor-driven intracellular stochastic processes for which quantitative models are yet to be developed. In part I, we discuss mainly the methodology and the generic models of various important classes of molecular motors. In part II, we review many specific examples emphasizing the unity of the basic mechanisms as well as diversity of operations arising from the differences in their detailed structure and kinetics. Multi-disciplinary research is presented here from the perspective of physicists.