室内装修苯类污染的解析及防控     

钱德俊  张翔 《淮南职业技术学院学报》2008,8(1):39-40

检测发现,在装修后的室内空气中,以苯类和甲醛为主的有害气体含量有几百种之多;根据办公室和住宅装修后苯污染实测数据和苯的毒性分析,对比国家标准提出防控途径和治理措施,旨在提高人们对室内苯系物污染的认识并有效地进行防控。  相似文献   

对GridView控件高级应用的研究与实现     

顾正刚  毕海峰 《宁波职业技术学院学报》2008,12(2):25-28

进一步对ASP.NET 2.0中的GridView控件进行了深入分析与研究,探讨了GridView控件的更多高级应用。在扩展GridView控件的应用功能时主要采用.htc文件来进行代码封装。提出了对GridView控件的若干高级应用的思路,并给出了其实现方法。通过具体软件项目的应用与实践验证,取得了预期的效果。  相似文献   

锂带卷取的恒张力控制     

许文 《新疆职业大学学报》2008,16(3):70-72

本文对卷取机恒张力控制的原理进行分析,利用磁粉离合器的激磁电流与转矩成线性关系这一特性,设计了一闭环张力控制系统。  相似文献   

非线性系统特性及其控制策略研究     

杨国诗 《淮南师范学院学报》2008,10(5):37-38

分析控制系统非线性的来源,介绍非线性系统的主要特性,讨论传统的非线性控制研究方法及其局限性。综述现代非线性控制策略,最后展望非线性控制的发展趋势。  相似文献   

高校会计信息系统的内部控制方法   总被引：1，自引：0，他引：1  

倪江陵 《湖南科技学院学报》2008,29(4):165-166

网络的发展,使得高校会计的内部控制出现了许多新的特征,高校会计信息系统也发生了很大的变化.本文就高校会计信息系统的组织控制和日常业务控制提出了一些内控方法.  相似文献   

基于sweep法的自动引导车路径追踪调节器设计与仿真     

王杰  周永年  刘金锋 《安阳工学院学报》2008,(4)

提出了一种基于sweep法的自动引导车路径追踪调节器的设计方法。根据自动引导车的状态空间模型,采用成本函数最小的标准来推导求解反馈矩阵的最佳控制问题．并对该两端点边界值问题引入sweep法解得要求的时变最佳控制。仿真实验结果表明,自动引导车在该路径跟踪调节器的速度及加速度补偿作用下可以很快消除3个追踪误差量,保证自动引导车具有准确跟随预定路径的能力。  相似文献   

Suboptimal reliable guaranteed cost control for continuous-time systems with multi-criterion constraints     

Deng-feng Zhang  Hong-ye Su  Jian Chu  Zhi-quan Wang 《浙江大学学报(A卷英文版)》2008,9(8):1024-1033

The suboptimal reliable guaranteed cost control （RGCC） with multi-criterion constraints is investigated for a class of uncertain continuous-time systems with sensor faults. A fauk model in sensors, which considers outage or partial degradation of sensors, is adopted. The influence of the disturbance on the quadratic stability of the closed-loop systems is analyzed. The reliable state-feedback controller is developed by a linear matrix inequalities （LMIs） approach, to minimize the upper bound of a quadratic cost fimction under the conditions that all the closed-loop poles be placed in a specified disk, and that the prescribed level of H∞ disturbance attenuation and the upper bound constraints of control inputs＇ magnitudes be guaranteed. Thus, with the above muki-criterion constraints, the resulting closed-loop system can provide satisfactory stability, transient property, a disturbance rejection level and minimized quadratic cost performance despite possible sensor faults.  相似文献   

Delay-dependent robust control for uncertain discrete singular systems with time-varying delay   总被引：1，自引：0，他引：1  

Hui-jiao Wang  Xiao-dong Zhao  An-ke Xue  Ren-quan Lu 《浙江大学学报(A卷英文版)》2008,9(8):1034-1042

The design problem of delay-dependent robust control For uncertain discrete singular systems with time-varying delay is addressed in this paper. The uncertainty is assumed to be norm-bounded. By establishing a finite sum inequality based on quadratic terms, a new delay-dependent robust stability condition is derived and expressed in terms of linear matrix inequalities （LMIs）. A suitable robust state feedback control law is presented, which guarantees that the resultant closed-loop system is regular, causal and stable for all admissible uncertainties. Numerical examples are given to demonstrate the applicability of the proposed method.  相似文献   

SOFC temperature evaluation based on an adaptive fuzzy controller     

Xiao-juan Wu  Xin-jian Zhu  Guang-yi Cao  Heng-yong Tu 《浙江大学学报(A卷英文版)》2008,9(5):688-694

The operating temperature of a solid oxide fuel cell （SOFC） stack is a very important parameter to be controlled, which impacts the performance of the SOFC due to thermal cycling. In this paper, an adaptive fuzzy control method based on an affine nonlinear temperature model is developed to control the temperature of the SOFC within a specified range. Fuzzy logic systems are used to approximate nonlinear functions in the SOFC system and an adaptive technique is employed to construct the controller. Compared with the traditional fuzzy and proportion-integral-derivative （PID） control, the simulation results show that the designed adaptive fuzzy control method performed much better. So it is feasible to build an adaptive fuzzy controller for temperature control of the SOFC.  相似文献   

沥青路面平整度分析及控制措施探讨     

吕长德 《石家庄铁路职业技术学院学报》2008,7(1):21-25

沥青路面平整度是影响行车安全性和舒适性的重要因素.根据多条高速公路的施工经验,通过分析各种可能的影响因素,对提高平整度提出相应的控制措施,许扶高速路面的施工实践,证明这些措施行之有效.  相似文献