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( Jianguo Duan ),( Nan Xie ),( Lianhui Li ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.4
In the design of production system, buffer capacity allocation is a major step. Through polymorphism analysis of production capacity and production capability, this paper investigates a buffer allocation optimization problem aiming at the multi-stage production line including unreliable machines, which is concerned with maximizing the system theoretical production rate and minimizing the system state entropy for a certain amount of buffers simultaneously. Stochastic process analysis is employed to establish Markov models for repairable modular machines. Considering the complex structure, an improved vector UGF (Universal Generating Function) technique and composition operators are introduced to construct the system model. Then the measures to assess the system’s multi-state reliability and structural complexity are given. Based on system theoretical production rate and system state entropy, mathematical model for buffer capacity optimization is built and optimized by a specific genetic algorithm. The feasibility and effectiveness of the proposed method is verified by an application of an engine head production line.
Jianguo Liao,Yanqun Li,Xiali Guan,Jingxian Liu,Yongxiang Zhang,Yufen Xie,Zhengpeng Yang,Xingze Duan,Aiguo Zhou,Jiangnan Zhu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.10
Hydroxyapatite and strontium-substituted hydroxyapatite nanoparticles (n-HA and Sr-HA) were prepared by microwave-assisted solution synthesis with aqueous solutions of various Sr/(Sr+Ca) molar ratios ranging from 0% to 15%. The structural properties of the hydroxyapatite powders were investigated by X-ray powder diffraction, Fourier transform infrared spectroscopy and Raman spectra, field emission scanning electron microscopy coupled with energy dispersive X-ray spectrometry and transmission electron microscopy. The results confirmed that strontium ions had been incorporated into the hydroxyapatite lattice. The synthetic n-HA and Sr-HA nanocrystalline consisted of hydroxyapatite crystalline phase with hexagonal structure, and the particle size was 30–40 x 60–70 nm and 40–50 x 70–80 nm, respectively. The calcined HA particle size ranged from about 120 nm to 150 nm, the calcined Sr-HA products were composed of spherical aggregates with a size of about 70–100 nm. The incorporation of Sr ions lead to the formation of vacancies in the crystal structure of the HA. The results indicated that the strontium substitution did not change the crystal structures. More Sr resulted in less calcined crystallites and formed agglomerates owing to the size effect.
Qi Meng,Jianguo Duan,Ying-Jie Zhang,Peng Dong 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
In this study, a novel efficient and environmentally friendly recycling process is developed to recoverspent LiMn2O4 powder as raw materials for high-performance LiMnPO4/C nanocomposites. The processcomprises a mechanochemical liquid-phase activation of the precursor mixture followed by a single-stepsolid-state heat treatment. The results indicate that the recovered LiMnPO4/C nano-composite has apromising electrochemical performance with discharge capacities of 148.5, 136.1, and 116.5 mA h g 1 at0.05, 0.2, and 1C rate, respectively, in the voltage range of 2.5–4.5 V. A perfect cyclic performance is alsodisplayed with a capacity retention of 98% after 100 cycles at 1C rate.
Use of grape seed as reductant for leaching of cobalt from spent lithium-ion batteries
Ying-Jie Zhang,Qi Meng,Peng Dong,Jianguo Duan,Yan Lin 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.66 No.-
The grape seed was novelly used as reductant for leaching of spent LiCoO2 material, which is idea of “waste + waste → resources”. About 92% Co and 99% Li could be leached under the optimized conditions of grape seed 0.6 g/g, malic acid 1.5 mol/L, 180 min, 80 °C, and slurry density 20 g/L. The catechin, EC and EGCG contained in grape seed could be employed as efficient reductants during leaching. The leaching process is controlled by combination of surface chemical reaction and diffusion with apparent activation energy of 11.96 kJ/mol, which is related to the form of Co(OH)3.