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An observer-based fault estimation strategy is proposed to solve the fault problem of yaw rate sensor. Firstly， considering the uncertainty caused by tire cornering stiffness characteristics and nonlinear disturbance in the system， the mathematical model of vehicle four-wheel steering system is established. Then， an observer-based sensor fault estimation strategy is designed， and the observer gain is solved by Lyapunov function and linear matrix inequality method. Finally， the effectiveness of the sensor fault estimation strategy is verified by Carsim and Simulink simulation. The results show that the proposed strategy can estimate the system state and sensor fault well when the sensor fault occurs. It can provide key information for vehicle safety and stability system， and provide technical support for the next step of sensor fault-tolerant control [ABSTRACT FROM AUTHOR]

Copyright of Journal of Northeastern University (Natural Science) is the property of Dongbei Daxue Xuebao and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Northeastern University (Natural Science) is the property of Dongbei Daxue Xuebao and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Northeastern University (Natural Science) is the property of Dongbei Daxue Xuebao and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A new polymer composite adsorption material of diatomite and chitosan was prepared using a crosslinking agent of glutaraldehyde and its adsorption property of mercury ions (Hg2+ ) in water was studied. The effects of the composite material ratio, initial concentration of Hg2+ , the weight of adsorption material and adsorption time on the Hg2+ removal property were investigated. The results show that the Hg2+ removal rate and adsorption capacity decrease with the increasing diatomite content in the composite. However, the Hg2+ removal rate decreases and adsorption capacity increases with the increasing initial concentration of Hg2 +. The Hg2 + removal rate and adsorption capacity increases with the increasing weight of the adsorption material. When the adsorption time is less than 45 min, the corresponding Hg2 + removal rate and adsorption capacity increases with increasing adsorption time, while they become nearly constant after 45 min. [ABSTRACT FROM AUTHOR]