综合(指导)类科技期刊发展现状及对策思考

文章分析了目前我国综合(指导)类科技期刊存在的主要问题,提出了综合(指导)类科技期刊要走出困境必须采取的对策措施。     

35t/h工业链条炉计算机控制系统的设计

介绍了35t/h工业链条炉计算机控制系统,论述了各控制系统的实现,阐述了系统软件的设计。     

提高焦炉单孔产焦量实现焦炉增产增效

分析了某焦化厂妁生产现状和装煤操作技术，提出了装煤和平煤的改进措施。     

污水处理自动挖制系统的应用

介绍了PLC自动控制系统结构及配置,并对控制系统的5种操作方式和控制程序的设计进行了论述。     

Feedback stabilization of snap-through buckling in a preloaded two-bar linkage with hysteresis

We study a linearly damped preloaded two-bar linkage that exhibits hysteresis due to the presence of multiple attracting equilibria. The dynamics at the unstable equilibrium, through which a snap-through buckle occurs, are not linearizable due to a solution-dependent singularity. We stabilize the unstable equilibrium using two distinct non-linear controllers. The feedback-linearization controller requires knowledge of the linkage parameters, whereas the robust version of the intrinsic non-linear proportional-derivative controller requires only an upper bound on the stiffness.     

Motion Control by ZV Shaper Synthesis Extended for Fractional Systems and Its Application to CRONE Control

Shaping command input or preshaping is used for reducing system oscillation in motion control. Desired systems inputs are altered so that the system finishes the requested move without residual oscillation. This technique, developed by N.C. Singer and W.P. Seering, is used for example in the aerospace field, in particular in flexible structure control. This paper presents the study of ZV shaper for explicit fractional derivative systems (generalized derivative systems). A robustness study of ZV shaper is then presented and applied to improve second generation CRONE control response time. Results from simulation and from a DC motor bench are also given.     

Passive control of the flow around a square cylinder using porous media

The passive control of bluff body flows using porous media is investigated by means of the penalization method. This method is used to create intermediate porous media between solid obstacles and the fluid in order to modify the boundary layer behaviour. The study covers a wide range of two‐dimensional flows from low transitional flow to fully established turbulence by direct numerical simulation of incompressible Navier–Stokes equations. A parametric study is performed to illustrate the effect of the porous layer permeability and thickness on the passive control. The numerical results reveal the ability of porous media to both regularize the flow and to reduce the drag forces up to 30%. Copyright © 2004 John Wiley & Sons, Ltd.     

采煤工作面瓦斯涌出分析及控制技术

分析了采煤工作面瓦斯涌出规律及其主要影响因素,论述了瓦斯治理及控制技术。     

对五棵树开发区区域环境的研究

通过对建设五棵树开发区周边环境状况影响评价，指出影响环境因素。根据周边环境质量现状，给出建立综合治理污染措施及手段，并对开发区建设后的生态适宜性进行了研究。     

我国高校青年教师流失控制研究

分析了我国高校青年教师的流失现状及特点,分析了高校青年教师流失的影响因素,提出了高校控制青年教师流失的策略。