新编民谣

到了天津才知道自己笑话讲不好到了上海才知道自己穿的过时了到了湖南才知道自己辣的吃不了到了四川才知道自己麻的受不了到了山西才知道自己喝醋滋味了到了山东才知道自己爽快有多好到了新疆才知道石油真是不愁了到了内蒙才知道大革原有多么好到了西藏才知道空气真是缺不了     

蠕动的钱程系列报道之二——内忧外患

普遍服务赔本了,报刊自办发行了,商业信函空间缩小了土速递自动发展了,WTO进来了,中国邮政不转型不行了     

运用多媒体技术,提高小学语文课堂教学效率

科学技术的日新月异发展,推进了素质教育的进程,多媒体技术已经走进了课堂,为教师教学开辟了广阔空间。多媒体技术激发了学生浓厚的学习兴趣,化解了教学难点,创设了丰富的教学情境,有效地进行了德育渗透,突出了学生主体地位,提高了课堂教学效率。本文试就小学语文教学运用多媒体技术问题进行了探讨。     

简论多媒体技术在小学语文教学中的应用

科学技术的日新月异发展,多媒体技术已经进入了课堂,优化了课堂教学,提高了教学效率,突出了学生主体地位,激发了学生学习欲望,调动了学生学习的积极性、主动性、创造性,扩大了知识容量,促进了学生想象思维的发展,实现了课堂教学过程的最优化。本文试就多媒体技术在小学语文教学中的应用进行了探讨。     

多媒体技术在小学数学教学中的作用

科学技术的日新月异发展,推动了素质教育的进程,多媒体技术已经走进了课堂,本文阐述了小学数学教学应用多媒体技术,激发了学生浓厚的学习兴趣,化解了教学重点难点,营造了良好的氛围,优化了课堂教学,提高了课堂教学效率。     

时代抛弃落伍者

整个社会仿佛是在一夜之间发生了翻天覆地的变化。我们刚刚经历了主机、个人计算机时代,又一下子迈入今天的云计算、物联网时代。我们有了互联网、有了苹果、有了Android、有了Facebook、有了微博、有了搜索引擎、     

PC变了——微软领跑Media Center

PC变了，变得平易近人了，变得讨大家欢心了，变得没有以前那么刻板了，就连父亲也喜欢上了它，开始用它看大片了。媒体中心电脑的成熟打破了PC传统的操作理念，使它变成了家庭娱乐中心，成为全家人的新宠。     

展望未来的通信 寻找明日的商机——2003年中国国际通信(设备)技术展览会火线报道

我们看到了3G,看到了PHS,看到了IPv6,看到了DSL,看到了各式各样的新鲜装备。此外,我们还看到了设备商献媚运营商,看到了运营商取悦消费者,看到了消费者痴迷新装备……2003年中国乃至亚洲最大规模的通信展会在向我们传递着来自明日通信的全新理念。     

《软件工程》教学改革的探讨与实践

分析了软件工程课程的教学特点,结合遵义师范学院学生学习现状,整合了教学内容、组建了多种教学方式、进行了教学评价改革与实践,提高了学生学习主动性和积极性,培养了学生分析问题、解决问题的能力,提高了教学质量。     

IT融资：冬去春来，谁当领跑

地震震动了人心,奥运鼓舞了人心,金融海啸席卷了人心。 失业了,郁闷;降息了,还银行贷款少了,高兴。人们在悲喜交织中动荡着。     

Feedforward output-feedback control for continuous exothermic reactors with isotonic kinetics

The robust feedforward (FF) output-feedback (OF) control problem of (possibly open-loop unstable) continuous exothermic jacketed reactors with isotonic kinetics with respect to reactant concentration is considered. The volume, temperature, and concentration must be regulated by manipulating the feed, exit and coolant flowrates on the basis of volume and temperature measurements. The problem is addressed as an interlaced controller-observer design within a constructive control framework. The result is a quasi linear-decentralized (qLD) FF-OF dynamic controller which: (i) recovers (up to observer convergence) the behavior of a robust nonlinear FF-SF controller, (ii) has closed-loop stability conditions coupled with conventional-like tuning guidelines, and (iii) constitutes an add-on to the PI control scheme commonly employed in industrial reactors. The approach is tested with an open-loop unstable reactor example through simulations.     

模型跟踪广义预测鲁棒自适应控制器

本文采用滤波CARMA模型,基于内模原理,提出了一种新的广义预测鲁棒自适应控制器,并分析了闭环系统性能,在新的控制器中,引入适当的前馈作用,使得跟踪和调节问题解耦,利用部分状态跟踪、模型参考以及极点配置方法解决跟踪问题,利用多步预测滚动优化方法解决调节问题;适当选择滤波器可以保证对平稳随机扰动有满意的响应,减少可调参数对闭环系统响应的影响,增强系统对未建模动态的鲁棒性,仿真结果表明:该控制器对确定性和非平稳随机扰动具有不变性,对系统时延和阶次变化具有鲁棒性,适用于非最小相位和开环不稳定系统。     

Least-restrictive robust periodic model predictive control applied to room temperature regulation

State-feedback model predictive control (MPC) of constrained discrete-time periodic affine systems is considered. The periodic systems’ states and inputs are subject to periodically time-dependent, hard, polyhedral constraints. Disturbances are additive, bounded and subject to periodically time-dependent bounds. The objective is to design MPC laws that robustly enforce constraint satisfaction in a manner that is least-restrictive, i.e., have the largest possible domain. The proposed design method is demonstrated on a building climate control example. The proposed method is directly applicable to time-invariant MPC.     

Robust containment control in a leader–follower network of uncertain Euler–Lagrange systems

A distributed controller is developed that yields cooperative containment control of a network of autonomous dynamical systems. The networked agents are modeled with uncertain nonlinear Euler–Lagrange dynamics affected by an unknown time‐varying exogenous disturbance. The developed continuous controller is robust to input disturbances and uncertain dynamics such that asymptotic convergence of the follower agents' states to the dynamic convex hull formed by the leaders' time‐varying states is achieved. Simulation results are provided to demonstrate the effectiveness of the developed controller. Copyright © 2016 John Wiley & Sons, Ltd.     

高速铝板轧机液压厚调计算机控制系统研究

本文给出了我国自行研制的并成功地应用于大型铝板冷轧机上的计算机控制液压厚调系 统.系统的工作原理及控制模型比较先进,APC系统响应速度快,厚度控制精度高.实际应 用表明:系统的软硬件工作稳定可靠,操作简便,经济效益显著,可推广应用.     

线性模糊PID控制器的设计与分析

基于模糊语言控制规则描述的模糊控制,已成功地用于工业过程控制并具有广泛的应用前景。用模糊线性PID控制器的数学等效式在MATLAB Simulink和Floulib工具帮助下用Mamdani方法对一阶控制对象进行二维PID模糊控制仿真实验,理论分析与实验证明采用模棚线性PID控制方法比传统的PID控制方法在应用上简便、清晰,具有一定的实用价值。     

Dual-mode Nonlinear MPC via Terminal Control Laws With Free-parameters

The paper presents a new dual-mode nonlinear model predictive control (NMPC) scheme for continuous-time nonlinear systems subject to constraints on the state and control. The idea of control Lyapunov functions for nonlinear systems is used to compute the terminal regions and terminal control laws with some free-parameters in the dual-mode NMPC framework. The parameters of the terminal controller are selected offline to estimate the terminal region as large as possible; and the parameters are optimized online to gain optimality of the terminal controller with respect to given cost functions. Then a dual-mode NMPC algorithm with varying time-horizon is formulated for the constrained system. Recursive feasibility and closed-loop stability of this NMPC are established. The example of a spring-cart is used to demonstrate the advantages of the presented scheme by comparing to the dual-mode NMPC via the linear quadratic regulator (LQR) method.      

A New Control Scheme of Single-link Flexible Manipulators Robust to Payload Changes

A new scheme is presented in this paper to control single-link flexiblemanipulators. The objective is to control the tip position of the flexiblearm in the presence of joint friction and payload changes. The controlscheme is based on two nested loops: an inner feedback loop to control themotor position which is robust to joint friction, and an outer loop tocontrol the tip position which is robust to payload changes. This outer loopis composed of a feedforward term and a feedback term. This results in asimple control law that needs minimal computing effort and, thus, can beused for real time control of flexible arms. The proposed method is generalin the sense that it can be applied to very different arm structures anddiverse sensor systems configurations. Results corresponding to twodifferent arm setups are presented.     

具有比例积分结构的广义预测自校正控制器

本文通过对一般预测控制中目标函数的改进，导出了具有比例积分结构的广义预测自校正控制器，从而极大地改善了控制器性能。仿真结果表明了该算法的有效性，对促进自校正控制器在工业中的应用具有一定意义。     

吊车防摆技术的研究

本文介绍了为消除吊车在吊运货物时引起的摆动进行的实验研究。实验方法都有各自的优缺点和所适用的场所、环境。证明了最优调节器防摆、模糊控制防摆和自适应防摆等都有良好的防摆效果。