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Almost Disturbance Decoupling for a Class of Inherently Nonlinear Systems
Yan-Ming Fu,Guang-Ren Duan,Ai-Guo Wu 제어·로봇·시스템학회 2009 International Journal of Control, Automation, and Vol.7 No.2
The problem of almost disturbance decoupling (ADD) for a class of inherently nonlinear systems is considered. The controlled systems are beyond triangular form and possess uncontrollable linearization. The performance of ADD is characterized in terms of L2-L2p gain. By using the tool of adding a power integrator, under a set of growth conditions a smooth sate feedback controller is explicitly constructed to attenuate the influence of the disturbance on the output with an arbitrary degree.
Yan-Ming Fu,Yang Lu,Mao-Rui Zhang 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.5
This paper deals with the model reference tracking control problem of continuous-time periodic linearsystems when the actuator occurs jumping fault. The main contribution is to formulate the parametric designalgorithm for the systems by utilizing the parametric solution of the generalized Sylvester matrix equations. Theexistence condition of the controller is deduced based on the Lyapunov stability theory. The controller consistsof the additive contribution of two terms: a feedback term and a feedforward term. The feedback term is thefeedback control law which can stabilize the system with finite expected cost. The feedforward term is the completeparametric feedforward tracking compensator. The simulation for flying around mission is carried out about twospacecrafts in elliptical orbit. The simulation results show the effectiveness of the proposed approach.
Molecule-based electrorheological material with luminescence property
Ming-Xing Chen,Fu-Hui Liao,Yan-Li Shang,Yun-Ling Jia,Jun-Ran Li 한국유변학회 2013 Korea-Australia rheology journal Vol.25 No.1
Molecule-based electrorheological (ER) materials with luminescence property, based on β-cyclodextrin [(C6O5H10)7, β-CD] inclusion compounds between β-CD (host) and the rare earth (RE) (RE=Tb, Eu) complex (guest), have been synthesized as a novel type of ER materials using β-CD, Tb(NO3)3, Eu(NO3)3, sulphosalicylic acid (C7H6O6S·2H2O, SSA) and m-phthalic acid (C8H6O4, MPA) as original materials. The composition, ER performance, luminescence property and dielectric property of the materials have been studied. The results show that the rare earth complex in the cavity of β-CD may enhance the ER performance of β-CD, and the complex (Tb-SSA) of Tb3+ can improve more effectively the ER activity of β-CD than that (Eu-MPA) of Eu3+ among both of the complexes. The composition and structure are the dominant factors in improving the ER effect. The fluorescence intensity, fluorescence lifetime and emission quantum yield of the particle materials and their suspensions in silicone oil have been tested, and fine luminescence performance has been detected. The material with ER activity and luminescence performance is a novel multifunctional material which would have wide application prospect.
Yan-Fu Lin,Jiann-Rong Chen,Jo-Ming Tseng,Shu-Yu S. Wang,Chi-Min Shu 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.3
Methyl ethyl ketone peroxide (MEKPO) is an unstable material that is classified as an explosive substance. We evaluated MEKPO 10 mass% under mixing with three inorganic acids (6 N HNO3, 6 N H3PO4, and 6 N H2SO4) by adiabatic system of vent sizing package 2 (VSP2). Results from evaluation and testing indicated that these three inorganic acids could increase the degree of hazard while combined with pure MEKPO. Therefore, information on the hazards and phenomena of runaway reaction should be provided in order to lessen the degree of hazard.
Preparation of Si3N4 powder by combustion synthesis
Jin-fu Li,Kang Li,Guo-bin Li,Dong-ming Yan 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.3
The present paper addresses a possible route for the manufacturing of silicon nitride (Si3N4) powder under rather a low pressure of nitrogen using a combustion synthesis (CS) method. Reactant mixtures were diluted by 30-50 wt% of Si3N4 to avoid the melting of silicon during combustion. Si3N4 powders with α/(α + β) ratios were prepared in a loose powder mixture state in the temperature range of 1500-2200 oC with dwell times from 10 to 60 minutes. The influence of the amount of ammonium fluoride (NH4F) in the mixture with silicon, the silicon particle size distribution, and the nitrogen pressure on the extent of silicon conversion into silicon nitride was experimentally studied. It was revealed that a small ammonium fluoride addition to silicon powder allowed the production of silicon nitride powder with a good output for industrialization. Because of the existence of the NH4F, the reaction involves not only the silicon nitriding mechanism, the growth of α-Si3N4 occurred partially by a vapor-crystal growth mechanism, and a vapor-liquid-solid (VLS) mechanism works during the rod-like β-Si3N4 growth. The as-synthesized samples were characterized using X-ray diffraction and scanning electron microscopy analyses. Possible mechanisms of CS Si3N4 particle growth are discussed. CS technology has the advantage over traditional technology in simple equipments, low cost, high quality and relative good sintering activity. The present paper addresses a possible route for the manufacturing of silicon nitride (Si3N4) powder under rather a low pressure of nitrogen using a combustion synthesis (CS) method. Reactant mixtures were diluted by 30-50 wt% of Si3N4 to avoid the melting of silicon during combustion. Si3N4 powders with α/(α + β) ratios were prepared in a loose powder mixture state in the temperature range of 1500-2200 oC with dwell times from 10 to 60 minutes. The influence of the amount of ammonium fluoride (NH4F) in the mixture with silicon, the silicon particle size distribution, and the nitrogen pressure on the extent of silicon conversion into silicon nitride was experimentally studied. It was revealed that a small ammonium fluoride addition to silicon powder allowed the production of silicon nitride powder with a good output for industrialization. Because of the existence of the NH4F, the reaction involves not only the silicon nitriding mechanism, the growth of α-Si3N4 occurred partially by a vapor-crystal growth mechanism, and a vapor-liquid-solid (VLS) mechanism works during the rod-like β-Si3N4 growth. The as-synthesized samples were characterized using X-ray diffraction and scanning electron microscopy analyses. Possible mechanisms of CS Si3N4 particle growth are discussed. CS technology has the advantage over traditional technology in simple equipments, low cost, high quality and relative good sintering activity.
Hui-Ming Xiang,Rui-Yan Ma,Hong-Liang Diao,Xian-Wei Li,Xiao-Juan He,Yong-Fu Guo 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.4
The oriental fruit moth (OFM), Grapholita molesta (Lepidoptera: Tortricidae), is a serious pest of stone and pome fruit trees worldwide. G. molesta can switch hosts and produce multiple generations per year. Both the primary and secondary host plants of G. molesta emit aldehydes. Here, we tested whether these aldehydes are helpful for host switching of G. molesta. SPME (Solid Phase Microextraction)-GC–MS analysis identified four aldehydes (octanal, nonanal, decanal, and benzaldehyde) from volatiles of late-season yellow peach fruits. Of the four aldehydes, eletroantennogram analysis showed that nonanal produced the strongest response from the antennae of virgin and mated females. In Y-tube bioassays, only nonanal was attractive to mated G. molesta females amongst the four aldehydes, suggesting that nonanal is important for host recognition in G. molesta. In a field trial, each of the four aldehydes was tested as an attractant for both sexes of G. molesta. The traps baited with nonanal captured more female G. molesta, as compared to traps with other aldehydes and control; the traps baited with benzaldehyde captured most male G. molesta. Our research investigations provide theoretical foundation for biological control of G. molesta females. Future G. molesta lure designs should take into account sex-specific differences in the response to individual aldehydes.