中部崛起重在"三农"问题的解决

中部拥有我国1／3的农村人口和粮食产量，因此，解决“三农”问题就成为中部崛起的重点和难点。要做到这一点，必须积极推进农业现代化，壮大县城经济，大力发展农产品加工业，促进农村劳动力转移，增加农民收入，妥善处理各种经济、社会关系。此外，还需要中央政府的政策支持。     

基于改进型球结构支持向量机的故障诊断方法及其应用

1引言涡轮泵等是极易发生故障的机械设备,近几年来,神经网络等智能技术在此类设备的故障诊断领域中得到广泛的应用[1]。故障支持向量机是Vapnik等在20世纪90年代研究并迅速发展起来的一种新型的机器学习方法[2],它是专门针对有限样本情况的,其目标是得到现有信息下的最优解而不     

APPLICATION OF DIRECT BTT GUIDANCE LAW BASED ON NONLINEAR INVERSE SYSTEM THEORY TO INTEGRATED FIRE／FLIGHT SYSTEMS（IFFS）

ＡＰＰＬＩＣＡＴＩＯＮ　ＯＦ　ＤＩＲＥＣＴ　ＢＴＴ　ＧＵＩＤＡＮＣＥ　ＬＡＷ　ＢＡＳＥＤ　ＯＮ　ＮＯＮＬＩＮＥＡＲ　ＩＮＶＥＲＳＥ　ＳＹＳＴＥＭ　ＴＨＥＯＲＹ　ＴＯ　ＩＮＴＥＧＲＡＴＥＤ　ＦＩＲＥ／ＦＬＩＧＨＴ　ＳＹＳＴＥＭＳ（ＩＦＦＳ）ＭａＸｉａｏ...     

基于鲁棒故障观测器的非线性离散系统容错控制设计

针对存在执行器故障以及未知干扰的非线性离散系统,提出了一种鲁棒故障估计与容错控制方法。首先在未知系统干扰作用下,设计鲁棒故障观测器实现系统状态和执行器故障的同步估计;然后根据鲁棒故障观测器得到的系统状态估计和故障估计信息设计容错控制器,进行状态反馈容错控制,同时基于D稳定与H_∞控制理论对鲁棒故障观测器和容错控制器进行设计,实现了多约束条件下的故障估计与容错控制;最后用飞行控制系统模型验证了所提方法的有效性。     

一个－阶逻辑公理系统独立性的证明

独立性是公理系统的重要性质之一．给出了一个－阶逻辑的公理系统，采用语义解释和公式变换的方法，证明了它的独立性．     

远程空空导弹作战体系

探讨实现远程空空导弹作战的有效技术途径.将各种可调用的探测及通讯手段,组成远程目标运动信息获取及导弹制导指令信息传输网,与导弹载机以及导弹共同组成作战体系,实现对远程目标的攻击.提出了远程空空导弹作战体系方案,建立了各个组成的相关数学模型,分析了信息探测、传输、融合误差对作战效果的影响,完成了作战体系的仿真.结果表明该远程空空导弹作战体系方案是有效的.     

具有层次结构的模糊决策

本文将AHP的层次结构引入模糊决策中,建立了具有层次结构的模糊决策模型,从而避免了因将模糊判断引入AHP中而产生的某些困难,并将之试用于简化了的飞机成本分析。     

A novel two-stage extended Kalman filter algorithm for reaction flywheels fault estimation

This paper investigates the problem of two-stage extended Kalman filter(TSEKF)-based fault estimation for reaction flywheels in satellite attitude control systems(ACSs). Firstly, based on the separate-bias principle, a satellite ACSs with actuator fault is transformed into an augmented nonlinear discrete stochastic model; then, a novel TSEKF is suggested such that it can simultaneously estimate satellite attitude information and actuator faults no matter they are additive or multiplicative; finally, the proposed approach is respectively applied to estimating bias faults and loss of effectiveness for reaction flywheels in satellite ACSs, and simulation results demonstrate the effectiveness of the proposed fault estimation approach.     

Invariant and energy analysis of an axially retracting beam

The mechanism of a retracting cantilevered beam has been investigated by the invariant and energy-based analysis. The time-varying parameter partial differential equation governing the transverse vibrations of a beam with retracting motion is derived based on the momentum theorem. The assumed-mode method is used to truncate the governing partial differential equation into a set of ordinary differential equations (ODEs) with time-dependent coefficients. It is found that if the order of truncation is not less than the order of the initial conditions, the assumed-mode method can yield accurate results. The energy transfers among assumed modes are discussed during retrac-tion. The total energy varying with time has been investigated by numerical and analytical methods, and the results have good agreement with each other. For the transverse vibrations of the axially retracting beam, the adiabatic invariant is derived by both the averaging method and the Bessel function method.