Nonlinear sampled-data output feedback receding horizon control

In this paper, we present an output feedback receding horizon control for a class of SISO nonlinear systems. A globally stabilizing state feedback receding horizon control scheme is combined with a discretized high gain observer. This is motivated by the fact that measurable system’s outputs are only available at specific sampling intervals. Our result follows from the application of a separation principle applicable to a class of sampled-data nonlinear systems. It is shown that the output-feedback scheme recovers the performance (rate of convergence) achieved under state feedback receding horizon control for a sufficiently large observer gain and sampling frequency.     

R407C组分分离特性实验研究

针对H407C三元混合工质的非共沸特性，在组分分离实验台上进行了相应的分离实验。结果表明：不同的分离器在不同的加热功率下的分离效果不同；经过组分分离实验，R407C的组分有明显的改变，并且在一定的实验工况下可以得到较好的分离效果。经分离后，轻、重组分最高比例可达48．71％和98．23％。     

Internet/Intranet智能岛系统的设计与实现

随着网络技术的发展和应用，网络安全问题已成为政府，企业以及广大网络用户最关心的问题之一。Internet/Intranet智能岛系统的实现解决了政府机关网络不允许直接与Internet物理连接，但又要利用Internet资源的矛盾问题，确保了内部网的封闭性和安全性。     

总温分离的首要条件

本文从总能量守恒方程出发，导出了引起总温变化的三大因素，并证明了在无传热的条件下，涡流管中总温分离是由不定常和粘性所引起的。     

乙烯装置混合碳五的综合利用

介绍了北京东方石化公司东方化工厂乙烯装置中汽油加氢工艺、碳五分离工艺的特点，并且对碳五分离后产品的性质和用途进行了分析。     

Reduced frequency effects on the near-wake of an oscillating elliptic airfoil

An experimental study was carried out to investigate the reduced frequency effect on the near-wake of an elliptic airfoil oscillating in pitch. The airfoil was sinusoidally pitched around the center of the chord between -5° and +25° angles of attack at an airspeed of 3.4 m/s. The chord Reynolds number and reduced frequencies were 3.3 X104, and 0.1, 0.7, respectively. Phase-averaged axial velocity and turbulent intensity profiles are presented to show the reduced frequency effects on the near-wake behind the airfoil oscillating in pitch. Axial velocity defects in the near-wake region have a tendency to increase in response to a reduced frequency during pitch up motion, whereas it tends to decrease during pitch down motion at a positive angle of attack. Turbulent intensity at positive angles of attack during the pitch up motion decreased in response to a reduced frequency, whereas turbulent intensity during the pitch down motion varies considerably with downstream stations. Although the true instantaneous angle of attack compensated for a phase-lag is large, the wake thickness of an oscillating airfoil is not always large because of laminar or turbulent separation.     

Separation of W from Ta, Hf, Lu and Mo by BPHAC_5H_(11)OH/HCl extraction system (Model experiments for chemical study of seaborgium, the 106th element)

1 INTRODUCTIONIn the past years, the study of chemical property of transactinide elements gaineda broad interest from both experimental and theoretical chefests to determine theirpositions in the element periodic tabl.[1-4J. However, due to the "relativistic effect" oftransactinide elements, the deviation from regulaxity of the periodic table was not suitablefor .the transactinide elements compared with their lighter homologue elements. A fewOf modelling experiments aimed at studying the …     

DVB通用接口的关键技术及实现方法

本文首先介绍了DVB条件接收系统的发展现状以及基本原理，然后针对机卡分离的DVB—CI通用接口技术和通用接口协议栈作了详细的阐述，对其接口从应用层到底层的协议特性和功能进行了分析和研究，并提出了通用接口的软件设计方法，实现数字电视条件接收功能，指明了DVB通用接口在条件接收系统中的作用重要性和广阔的应用前景。