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Weiping Luo,Jun Sun,Jun Ye,Wei Deng,Qiang Liu,Cancheng Guo 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
The liquid-phase catalytic aerobic oxidation of toluene by [T(p-Cl)PPFe]2O was studied in a series of three stirred tank reactors. The effects of operation mode (including semi-batch and continuous operation), reaction temperature, catalyst concentration, average residence time, and air flow rate on the oxidation process were examined. The experimental results showed that continuous oxidation had no advantage over the total yield and selectivity of benzaldehyde and benzyl alcohol in comparison with semi-batch oxidation. And the reaction temperature was the most significant factor influencing on continuous oxidation of toluene. It is also found that adopting sequentially decreased temperature in the three series reactors could improve the yield and selectivity of benzaldehyde and benzyl alcohol in this process. Under which at the higher conversion of toluene, the total yield to benzaldehyde and benzyl alcohol increased 17.05% or 43.62% respectively in comparison with adopting sequentially increased or same temperature in the three series reactors.
Weiping Tian,Shaofei Guo,Li Shi 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.5
Three Ni-based catalysts with different clay as support were prepared and tested in the hydrogenation of maleic anhydride, among which Ni/clay1 showed best activity and selectivity. Over Ni/clay1 catalyst prepared by impregnation method, 97.14% conversion of maleic anhydride and 99.55% selectivity to succinic anhydride were obtained at 180 °C under a pressure of 1 MPa. Catalytic activity was greatly influenced by the temperature and weighted hourly space velocity. Catalyst deactivation studies showed that this catalyst have a long life time, the yield of MA still higher than 90% even after a reaction time of 60 h. X-ray diffraction (XRD) and H2 temperature programmed reduction (TPR) were use to investigate the properties of the catalyst. XRD and TPR studies showed that Ni was present as Ni2+ on the support, which indicated that there was no elemental nickel (Ni0) and Ni2O3 in the unreduced samples. The formation of Ni was strong impact on catalytic activity.
Yongzhen Guo,Yang Luo,Weiping Wang,Xiong Luo,Chao Ge,Jürgen Kurths,Manman Yuan,Yang Gao 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.2
This paper focuses on the dynamical characteristics of complex-valued memristor-based BAM neural network (CVMBAMNN) with leakage time-varying delay. With two different controllers, we have obtained fixedtime and finite-time synchronization criteria respectively in complex domain for our special model, which few work has studied before. Since fixed-time synchronous system can improve communication security, we designed a scheme for RGB image encryption and decryption. In order to satisfy the requirement of much lower error in image secure communication, our approach can get the error of fixed-time synchronization to about 1×10−13. Due to our highly consistent system, we do get good encryption and decryption effect with encryption and decryption scheme. Finally, numerical simulations are included to demonstrate the correctness of our theoretical results.
Tian, Weiping,Guo, Shaofei,Shi, Li Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.5
Three Ni-based catalysts with different clay as support were prepared and tested in the hydrogenation of maleic anhydride, among which Ni/clay1 showed best activity and selectivity. Over Ni/clay1 catalyst prepared by impregnation method, 97.14% conversion of maleic anhydride and 99.55% selectivity to succinic anhydride were obtained at $180^{\circ}C$ under a pressure of 1 MPa. Catalytic activity was greatly influenced by the temperature and weighted hourly space velocity. Catalyst deactivation studies showed that this catalyst have a long life time, the yield of MA still higher than 90% even after a reaction time of 60 h. X-ray diffraction (XRD) and $H_2$ temperature programmed reduction (TPR) were use to investigate the properties of the catalyst. XRD and TPR studies showed that Ni was present as $Ni^{2+}$ on the support, which indicated that there was no elemental nickel ($Ni^0$) and $Ni_2O_3$ in the unreduced samples. The formation of Ni was strong impact on catalytic activity.
Valveless Piezoelectric Micropump of Parallel Double Chambers
Li Guo,Weiping Yan,Yinghua Xu,Yiru Chen 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
The driving performance of the piezoelectric actuator was simulated by ANSYS software, and the relationship between structure parameters and center displacement/frequency of piezoelectric actuator were obtained. The nozzle/diffuser pipes’structure parameters were optimized according to the results of ANSYS numerical simulation, and flow characteristic parameters such as flow rate and pressure distribution in the pipe were researched. The chamber was manufactured on glass, and nozzle/diffuser pipes were fabricated on <100> silicon by selective-wet etch using MEMS technology. These two components were glued with piezoelectric actuator together to form micropumps with single chamber and micropumps with parallel double chambers. The flow rates of micropumps in different conditions were measured by test system. Finally, a comparison between the test results of micropump with double chambers and that of the single chamber micropump is given.
Liwu Wang,Weiping Tian,Linquan Chen,Yunqiang Guo 한국항공우주학회 2021 International Journal of Aeronautical and Space Sc Vol.22 No.1
Based on the serious issue of the significant ablation (erosion) difference of nozzle throat in a solid rocket motor (SRM) during its operation on the ground and in the atmosphere, a numerical and experimental investigation of carbon–carbon (C/C) nozzle throat erosion in solid rocket motor under specific acceleration (overload) conditions was conducted. This paper work’s results show that the erosion rate of nozzle throat in the acceleration direction is significantly higher than it is in the non-overload direction, which is defined as throat deviant ablation. In the case studied in this paper, the nozzle throat’s deviant ablation rate in the overload direction is 5 times greater than it is in the non-overload direction when the lateral overload reaches 30 g. Moreover, a sharp, and nearly linear, rise in the nozzle throat’s deviant ablation is observed as the lateral overload increases. Since the lateral acceleration will change the particles’ trajectory, the particles will move towards the lateral direction. This will in turn aggravate the chemical ablation and mechanical erosion processes, leading to throat deviant ablation. This means that the increase in the throat erosion rate in the overload region is so abominable that it must be taken into account in the design of a nozzle and the prediction of SRM performance under acceleration conditions.
Dynamics and GA-Based Stable Control for a Class of Underactuated Mechanical Systems
Diantong Liu,Weiping Guo,Jianqiang Yi 대한전기학회 2008 International Journal of Control, Automation, and Vol.6 No.1
The control of underactuated mechanical system is very complex for the loss of its control inputs. The model of underactuated mechanical systems in a potential field is built with Lagrangian method and its structural properties are analyzed in detail. A genetic algorithm (GA)-based stable control approach is proposed for the class of under actuated mechanical systems. The Lyapunov stability theory and system properties are utilized to guarantee the system stability to its equilibrium. The real-valued GA is used to adjust the controller parameters to improve the system performance. This approach is applied to the underactuated double-pendulum-type overhead crane and the simulation results illustrate the complex system dynamics and the validity of the proposed control algorithm.