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- 저자 : Wenhan Xu (검색결과 3 건)
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Wenhan Song,Shuzhong Wang,Donghai Xu,Yang Guo,Chuang Yang,Jiandong Zhang,Yanhui Li 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.10
Hydrothermal liquefaction (HTL) of seven algae was conducted at both 280 and 350 oC with a reaction time of 30min and a mass ratio of 1/4 of algae to water to evaluate the utilization potential of bio-oil production and nutrient recycling in the aqueous by-product and solid residue particles. Chlorella and Nannochloropsis sp. exhibited the highest bio-oil yields at 280 oC (36.5% from Nannochloropsis sp.) and 350 oC (38.1% from Chlorella). Additionally, temperature had little effect on the energy recovery from Chlorella, Nannochloropsis sp., Spirulina, Cyanophyta and Euglena. The carbohydrates and lipids in the algae were primarily related to monoaromatic and single-ring heterocyclic compound generation in bio-oil. In addition, carbohydrates and proteins significantly affected oxygenated compound production. The sizable total carbon, ammonia nitrogen, total nitrogen and phosphate contents in the aqueous byproducts showed great potential as nutrient sources for algal cultivation and the production of value-added chemicals through recycling. Higher temperatures increased the percentage of ammonia nitrogen in the total nitrogen and reduced the phosphate concentration in the aqueous by-product. According to potential evaluation factors, Chlorella, Nannochloropsis sp., Spirulina, Cyanophyta and Euglena totally showed higher potential in terms of bio-oil production and aqueous nutrient recycling than Dunaliella salina and Enteromorpha prolifera, in which Nannochloropsis sp. exhibited the greatest utilization potential at investigated conditions.
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Yanwei Li,Wenhan Xu,Jinhuan Yao,Bin Huang,Shunhua Xiao,Jianwen Yang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-
Rational utilization of jarosite residue is significantly important from the view of environmental protectionand resource recycling. Herein, we report a facile preparation of porous amorphous FePO4/reducedgraphene oxide (rGO) composite by utilizing the iron resource in jarosite residue with a selective chemicalprecipitation method, and demonstrate its great potential as a high-performance anode material oflithium-ion batteries (LIBs). The FePO4/rGO composite exhibits superior cyclic performance(812.7 mA h g1 over 300 cycles at 500 mA g1) and high-rate capability (335.2 mA h g1 even at a highcurrent density of 10 A g1) in a half cell. More importantly, the full LIB assembled with FePO4/rGO anodeand commercial Li(Ni0.5Co0.2Mn0.3)O2 (NCM523) cathode still delivers a high and stable capacity of 674. 9/528.7 mA h g1 upon 100/300 cycles at 200/500 mA g1, indicating the great potential of this FePO4/rGO composite as a new anode material with high lithium storage performance. This work proposes asimple, feasible, and cost-effective strategy for the high-valued utilization of jarosite residue and providesa reference for the design and development of FePO4-based anode materials for LIBs.
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Adaptive Sliding Mode Control of a Transport Aircraft for Heavyweight Airdrop
Ri Liu,Xiuxia Sun,Wenhan Dong,Guangzhi Xu 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
This paper investigates the problem of designing a novel sliding mode controller of a transport aircraft for airdrop modes in the presence of bounded nonlinear uncertainty and actuator fault without the prior knowledge of the bounds. On the basis of feedback linearization of the aircraft-cargo dynamic model, an autopilot inner-loop which combines sliding mode control with adaptive function approximation is developed. The complex nonlinear uncertainty of the model is factorized into a known matrix and an uncertainty function. An adaptive approximation approach is used to estimate the function, and it overcomes the conservation drawback of the sliding mode control that relies on the bounds on the uncertainty/actuator fault. Notably, the adaptation law formed using the projection operator can bound the estimated function, and this avoids singularity of the control signal. Simulations verify the good performance of the control system, which can satisfy the airdrop mission performance indexes well, even in the presence of ±20% aerodynamic coefficients uncertainty and 20% actuator fault.
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