160t铁路铺架机可控硅整流系统移相触发控制器

本文介绍可用于可控硅自动控制系统的一种新型移相触发控制器。这种控制器集成度高，结构简单，调整方便，功耗小，可用于逻辑无环流和错位选触无环流的可逆或不可逆系统中，还可用于双反星形可控整流电路、十二相整流电路等电路中     

Study on the Robot Robust Adaptive Control Based on Neural Networks

Force control based on neural networks is presented. Under the framework of hybrid control, an RBF neural network is used to compensate for all the uncertainties from robot dynamics and unknown environment first. The technique will improve the adaptability to environment stiffness when the end-effector is in contact with the environment, and does not require any a priori knowledge on the upper bound of syste uncertainties. Moreover, it need not compute the inverse of inertia matrix. Learning algorithms for neural networks to minimize the force error directly are designed. Simulation results have shown a better force/position tracking when neural network is used.     

贯彻落实"三个代表"要求扎实做好思想政治工作

探索新时期党委做好思想政治工作的方式、方法，寻求思想政治工作新途径。     

露天矿汽车运输系统网络描述方法

本文建立了露天矿汽车运输系统的基本网络模型;实现了采场任一采掘位置与运输系统基本网络的联接;合理地解决了露天矿复杂的汽车运输系统汽车运输问题;并对网络计算程序和数据输入方法进行了介绍.     

智能型液压位置控制系统

本文提出的智能型液压位置控制系统,利用输入变化和参数补偿法,能够自动测试系统的死区、校正系统的不对称性和非线性增益;系统具有自学习功能,以模糊控制来抑制超调.试验表明,系统具有较高的稳态精度,从而能进行液压位置控制.     

刚体的角速度与基点无关的证明

刚体的角速度与基点无关，这是一个熟知的事实．现在还未见到教课书及刊物给出其严格证明，这里给出其严格的证明。     

试论定位基准的定义

本文讨论了定位基准的概念,试图给出恰当的定位基准的定义。     

儒家中和思想在新时代的意义

进入 2 1世纪以来的现实发展给我们两个深刻教训。第一 ,对和平与发展的追求 ,只靠善良的愿望和对“和”的理念的宣扬、说教 ,是不够的 ,而需要进一步研究“是什么”和“怎么样”的问题。第二 ,太和的理想并不现实 ,对和的追求只能是现实的、历史的。从当前的矛盾和冲突的现状出发 ,寻找求得相对和谐的途径 ,这是我们思考和平与发展问题的现实思路 ,也是我们思考传统中和思想的现代意义的现实思路     

Distribution of tightened end fragments of globular proteins statistically matches that of topohydrophobic positions: towards an efficient punctuation of protein folding?

Using a set of 372 proteins representative of a variety of 56 distinct globular folds, a statistical correlation was observed between two recently revealed features of protein structures: tightened end fragments or 'closed loops', i. e. sequence fragments that are able in three-dimensional (3D) space to nearly close their ends (a current parameter of polymer physics), and 'topohydrophobic positions', i. e. positions always occupied in 3D space by strong hydrophobic amino acids for all members of a fold family. Indeed, in sequence space, the distribution of preferred lengths for tightened end fragments and that for topohydrophobic separation match. In addition to this statistically significant similarity, the extremities of these 'closed loops' may be preferentially occupied by topohydrophobic positions, as observed on a random sample of various folds. This observation may be of special interest for sequence comparison of distantly related proteins. It is also important for the ab initio prediction of protein folds, considering the remarkable topological properties of topohydrophobic positions and their paramount importance within folding nuclei. Consequently, topohydrophobic positions locking the 'closed loops' belong to the deep cores of protein domains and might have a key role in the folding process. Received 1 February 2001; accepted 7 February 2001     

基于模糊的桥式起重机的定位和防摆控制研究

近年来，很多学者对桥式起重机的防摆控制方法进行了研究，以提高起重机的作业效率。针对起重机模型的非线性和不确定性，设计了一种基于模糊的起重机的定位和防摆控制方法，利用两个模糊控制器对小车的位置和负载的摆动分别进行控制。其中，模糊位置控制器的设计是参考一个简单的速度参考曲线，对位置和速度进行有效她控制；而模糊防摆控制器则模仿起重机操作员的实际操作经验设计了一套模糊控制规则来消除负载的摆动。仿真结果证明了该方法的可行性，并且与线性二次型最优控制(LQR)进行了比较，表明了该方法的良好性能，且该方法对不同的绳长和负载有着较好的鲁棒性。