不同稳定机制对SiC颗粒分散稳定性的影响

选用纳米级SiC颗粒为原料，分别采用单一静电稳定机制、加入PEG的空间位阻稳定机制和加入PMAA—NH4的电空间稳定机制，制备固相体积分数为1vol％的SiC水悬浮液，通过Zeta电位、沉降实验和粘度测定及粒度分析等手段，最终分别获得了碱性条件下高分散、高稳定的SiC水悬浮液。     

智能鲁棒控制算法的初步探讨

对一种智能鲁棒控制算法(IRC)进行了理论上的探讨,并对部分模型进行了仿真.该算法具有对内部结构不确定和外部环境干扰的不敏感性和控制算法的灵活性,通过仿真发现,在知识集完备的基础上,IRC算法具有鲁棒性、灵活性,可适用于大范围的被控对象,是很有前途的控制算法.     

关于含延迟坐标系统镇定混沌的算法

基于极点配置推导出含延迟坐标系统镇定嵌入混沌吸引子中不稳定不动点的ＯＧＹ控制算法和预迭代控制算法，从而具体地揭示了极点配置与控制混沌镇定方案之间的联系．     

浅议高校青年教师的流失与稳定

近几年来,随着改革的不断深化,各高校普遍存在着青年教师流失的局面,他们的流失给高校带来诸多问题,影响着高校的建设与发展.本文分析了青年教师流失的类型和青年教师流失的原因,并提出了稳定教师队伍的对策,以减少青年教师流失.     

浅议"注意"规律在体育教学中的应用

通过时“注意”的概念及其发展规律的阐述，提出了体育教学应加强学生“注意”品质的培养；并应用注意规律列举了集中学生注意力，提高体育教学效果一些具体方法。     

基于运动矢量的鲁棒视频去抖动算法

This paper proposes a new robust video stabilization algorithm to remove unwanted vibrations in video sequences. A complete theoretical analysis is first established for video stabilization, providing a basis for new stabilization algorithm. Secondly, a new robust global motion estimation (GME) algorithm is proposed. Different from classic methods, the GME algorithm is based on spatlal-temporal filtered motion vectors computed by block-matching methods. In addition, effective schemes are employed in correction phase to prevent boundary artifacts and error accumulation. Experiments show that the proposed algorithm has satisfactory stabilization effects while maintaining good tradeoff between speed and precision.     

Multi-objective robust controller synthesis for discrete-time systems with convex polytopic uncertain domain

Multi-objective robust state-feedback controller synthesis problems for linear discrete-time uncertain systems are addressed. Based on parameter-dependent Lyapunov functions, the Gl2 and GH2 norm expressed in terms of LMI (Linear Matrix Inequality) characterizations are further generalized to cope with the robust analysis for convex polytopic uncertain system.Robust state-feedback controller synthesis conditions are also derived for this class of uncertain systems. Using the above results,multi-objective state-feedback controller synthesis procedures which involve the LMI optimization technique are developed and less conservative than the existing one. An illustrative example verified the validity of the approach.     

高炉煤气洗涤水系统堵塞情况调查和原因分析

高炉煤气洗涤循环水中的悬浮物以及炉尘、大气灰尘和垢物等在循环系统中存在,且相互增强,从而引起高炉煤气洗涤循环水系统的堵塞.对系统增加磁化辅助处理、研制和试验更有效的水稳剂、旁滤1～3%的循环水,适当提高管网内水的流速以及定期清理系统等方法,或将这些方法合理地组合实施,则有望解决系统的堵塞问题.     

Nonlinear H∞ robust control applied to F-16 aircraft with mass uncertainty using control surface inverse algorithm

In this paper, an analytic solution of nonlinear H_∞ robust controller is first proposed and used in a complete six degree-of-freedom nonlinear equations of motion of flight vehicle system with mass and moment inertia uncertainties. A special Lyapunov function with mass and moment inertia uncertainties is considered to solve the associated Hamilton-Jacobi partial differential inequality (HJPDI). The HJPDI is solved analytically, resulting in a nonlinear H_∞ robust controller with simple proportional feedback structure. Next, the control surface inverse algorithm (CSIA) is introduced to determine the angles of control surface deflection from the nonlinear H_∞ control command. The ranges of prefilter and loss ratio that guarantee stability and robustness of nonlinear H_∞ flight control system implemented by CSIA are derived. Real aerodynamic data, engine data and actuator system of F-16 aircraft are carried out in numerical simulations to verify the proposed scheme. The results show that the responses still keep good convergence for large initial perturbation and the robust stability with mass and moment inertia uncertainties in the permissible ranges of the prefilter and loss ratio for which this design guarantees stability give same conclusion.     

一组多输入非线性系统的同时镇定(英文)

考虑设计一个控制器同时镇定一组多输入非线性系统的问题.利用李雅普诺夫函数方法, 给出了时不变同时镇定状态反馈控制器存在地充分条件,然后给出构造同时镇定一组系统的连续控制器的统一公式. 该结果是对文献[1]中讨论的单输入系统的结论的推广.