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- 저자 : Jialiang Yuan (검색결과 2 건)
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A Simplified Synchronous Pulse-Width Modulation Method for Three-level Inverter of High-speed Train
Fei Lin,Qiaona Lian,Jialiang Yuan,Zhongping Yang,Zhiqiang Zhang,Yue Xu,Jinghai Jiao 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.12
The synchronous Pulse-Width Modulation (PWM) is quite complex for three-level neutral point-clamped (NPC) inverter. A simple central 60° synchronous modulation method is presented in this paper for three-level NPC inverter used in the multi-mode PWM strategy. For the fundamental voltage command, the switching angle could be real-time calculated based on this modulation method with different carrier frequency ratios. The switching strategy between these modes is discussed for multi-mode PWM. According to this method, a simulation model of the drive system with three-level inverter and induction motor is built. The simulation results at asynchronous modulation, central 60° synchronous modulation and square wave area, show that the output voltage values can meet the requirements with a good symmetry even in the case of low carrier frequency ratio. The smooth switching among different modes is also accomplished with low impulse current.
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Removal of Cr(VI) from aqueous solution by rice husk derived magnetic sorbents
Ruifeng Yang,Shangru Zhai,Yuan Fan,Zhimin Lei,Na Liu,Jialiang Lv,Bin Zhai,Lei Wang 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.4
−A novel magnetic porous sorbent obtained from agricultural waste rice husk was successfully synthesized through a simple carbon-thermal method. The sorbent was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, vibrating sample magnetometer, N2 sorption analysis, and X-ray photoelectron spectroscopy. The removal efficiency of the sorbent for Cr(VI) was also investigated. Chromium adsorption was fitted by the pseudo-second-order and Langmuir models. The maximum chromium adsorption capacity, Brunauer-Emmett-Teller surface area, and average Barrett-Joyner-Halenda pore size of the magnetic sorbent were 157.7mg·g−1, 134.1m2·g−1, and 4.99 nm, respectively. The saturated magnetization of the novel adsorbent was 77.8 emu·g−1, indicating that the material can facilitate separation and recovery from aqueous systems. The removal mechanisms of Cr(VI) were also discussed. The result illustrates that rice husk-derived magnetic carbonaceous materials are a potential adsorbent for Cr(VI) pollution treatment and provide a suitable method for the effective conversion of biomass waste, which may solve the problem of waste disposal and widen the applications of the materials.
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