The structures and chemical states of SiO2/α-FeOOH and SiO2/α-Fe2O3 Ane particles haye been investigated by the technologies of HREM, XPS and CELS. The results show that a crystalline interface layer between SiO2 co...The structures and chemical states of SiO2/α-FeOOH and SiO2/α-Fe2O3 Ane particles haye been investigated by the technologies of HREM, XPS and CELS. The results show that a crystalline interface layer between SiO2 coating and α-FeOOH nucleus is formed, and its chethecal composition is infered to be α-Fe2O3. In view of this, a mechanism of its formation is presented. The results also show that the coating of SiO2/α-Fe2O3 obtained from SiO2/α-FeOOH by a thermal treatment is converted from an amorphous to crystal, line one and its mechanism is discussed. In addtion, the effects of the coating on the structuxe of vacant state above Fermi level of α-FeOOH fine particles have also been studied.展开更多
This paper studies the low-order dynamic modeling and active control of a flexible plate and provides experimental verification. First based on the input-output data of the sys- tem, the Markov parameters of the syste...This paper studies the low-order dynamic modeling and active control of a flexible plate and provides experimental verification. First based on the input-output data of the sys- tem, the Markov parameters of the system are identified using the method of observer/Kalman filter identification （OKID）. Then a low-order state-space model is built using the eigensystem realization algorithm （ERA）. Finally, a linear quadratic Gaussian （LQG） controller is designed based on the low-order state-space model. Experimental results have proved the effectiveness and feasibility of the research.展开更多
文摘The structures and chemical states of SiO2/α-FeOOH and SiO2/α-Fe2O3 Ane particles haye been investigated by the technologies of HREM, XPS and CELS. The results show that a crystalline interface layer between SiO2 coating and α-FeOOH nucleus is formed, and its chethecal composition is infered to be α-Fe2O3. In view of this, a mechanism of its formation is presented. The results also show that the coating of SiO2/α-Fe2O3 obtained from SiO2/α-FeOOH by a thermal treatment is converted from an amorphous to crystal, line one and its mechanism is discussed. In addtion, the effects of the coating on the structuxe of vacant state above Fermi level of α-FeOOH fine particles have also been studied.
基金Project supported by the Key Project (No. 11132001)the General Projects (Nos. 11072146 and 11002087)the National Natural Science Foundation of China
文摘This paper studies the low-order dynamic modeling and active control of a flexible plate and provides experimental verification. First based on the input-output data of the sys- tem, the Markov parameters of the system are identified using the method of observer/Kalman filter identification （OKID）. Then a low-order state-space model is built using the eigensystem realization algorithm （ERA）. Finally, a linear quadratic Gaussian （LQG） controller is designed based on the low-order state-space model. Experimental results have proved the effectiveness and feasibility of the research.
