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RISS 인기검색어
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- 저자 : Xiaomin Xing (검색결과 4 건)
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Mechanism of Tungsten Recovery from Spent Cemented Carbide by Molten Salt Electrodeposition
Hongxuan Xing,Zhen Li,Enrui Feng,Xiaomin Wang,Hongguang Kang,Yiyong Wang,Hui Jin,Jidong Li The Korean Electrochemical Society 2023 Journal of electrochemical science and technology Vol.14 No.1
The accumulation of spent carbide (YG8), not only pollutes the environment but also causes waste of tungsten, cobalt and other rare metal resources. To better address this issue, we proposed a combined electrochemical separation process of low-temperature aqueous solution and high-temperature molten salt for tungsten and cobalt. H<sub>2</sub>WO<sub>4</sub> was obtained from spent carbide in an aqueous solution, and we calcined it to obtain WO<sub>3</sub>, which was used as a raw material to obtain tungsten by using molten salt electrodeposition. The influence of the current efficiency and the electrochemical behavior of the discharge precipitation of W(VI) were also studied. The calcination results showed that the morphology of WO<sub>3</sub> was regular and there were no other impurities. The maximum current efficiency of 82.91% was achieved in a series of electrodeposition experiments. According to XRD and SEM analysis, the recovered product was high purity tungsten, which belongs to the simple cubic crystal system. In the W(VI) reduction mechanism experiments, the electrochemical process of W(VI) in NaCl-Na<sub>2</sub>WO<sub>4</sub>-WO<sub>3</sub> molten salt was investigated using linear scanning voltammetry (LSV) and chronoamperometry in a three-electrode system. The LSV showed that W(VI) was reduced at the cathode in two steps and the electrode reaction was controlled by diffusion. The fitting results of chronoamperometry showed that the nucleation mechanism of W(VI) was an instantaneous nucleation mode, and the diffusion coefficient was 7.379×10<sup>-10</sup> cm<sup>2</sup>·s<sup>-1</sup>.
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Xuebin Xu,Kan Meng,Xiaomin Xing,Chen Chen 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.3
Palmprint recognition has drawn increasingly attentions in the past decade due to its uniqueness and reliability. Traditional palmprint recognition methods usually use high-resolution images as the identification basis so that they can achieve relatively high precision. However, high-resolution images mean more computation cost in the recognition process, which usually cannot be guaranteed in mobile computing. Therefore, this paper proposes an improved low-resolution palmprint image recognition method based on residual networks. The main contributions include: 1) We introduce a channel attention mechanism to refactor the extracted feature maps, which can pay more attention to the informative feature maps and suppress the useless ones. 2) The ResStage group structure proposed by us divides the original residual block into three stages, and we stabilize the signal characteristics before each stage by means of BN normalization operation to enhance the feature channel. Comparison experiments are conducted on a public dataset provided by the Hong Kong Polytechnic University. Experimental results show that the proposed method achieve a rank-1 accuracy of 98.17% when tested on low-resolution images with the size of 12dpi, which outperforms all the compared methods obviously.
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Selective Adsorption and Reusability for Pb<SUP>2+</SUP> of Chitosan-based Microporous Polymer
Jie Yu,Jidong Zheng,Quanfang Lu,Xing Wang,Xiaomin Zhang,Qizhao Wang,Wu Yang 한국고분자학회 2017 폴리머 Vol.41 No.3
A green and simple glow-discharge electrolysis plasma (GDEP) technique was used to synthesize the chitosan/attapulgite/poly(acrylic acid-co-2-acrylamido-2-methyl-1-propanesulfonic acid) (CS/ATP/P(AA-co-AMPS)) microporous polymer. The results showed that the optimum pH for the adsorption of Pb<SUP>2+</SUP>, Cd<SUP>2+</SUP>, Co<SUP>2+</SUP>, and Cu<SUP>2+</SUP> is 4.8, and time of adsorption equilibrium is 60 min. Adsorption kinetics fits well to the pseudo-second-order model. The maximum adsorption capacities for Pb<SUP>2+</SUP>, Cd<SUP>2+</SUP>, Cu<SUP>2+</SUP> and Co<SUP>2+</SUP> are 500.0, 301.7, 180.0 and 151.7 mg g<SUP>-1</SUP>, respectively. The microporous polymer has higher adsorption selectivity toward Pb<SUP>2+</SUP> with the coexistence of Cd<SUP>2+</SUP>, Co<SUP>2+</SUP>, and Cu<SUP>2+</SUP>. The CS/ATP/P(AAco-AMPS) possesses promising regeneration and reusability using 2.0 g L–1 ethylenediamine tetraacetic acid tetrasodium salt (EDTA-4Na) solution as eluent. CS/ATP/P(AA-co-AMPS) can be used as a very promising absorbent for the separation purification and selective recovery of Pb<SUP>2+</SUP> in aqueous solution containing Cd<SUP>2+</SUP>, Co<SUP>2+</SUP>, and Cu<SUP>2+</SUP> ions.
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Kaili Zhu,Hongsheng Tan,Yajie Wang,Changheng Liu,Xiaomin Ma,Jie Wang,Haini Xing 한국섬유공학회 2019 Fibers and polymers Vol.20 No.4
The effect of two different continuous carbon fibers (CCF1 and CCF2) with different material properties onstructure-properties of continuous carbon fibers reinforced polyether-ether-ketone prepreg tapes (CCF/PEEKPT) prepared bya wet powder impregnation process were investigated. The effects of fiber content on the tensile properties, dynamicmechanical behavior, crystallization melting behavior and fracture morphology of prepared prepreg tapes were performed bythe dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC) and scanning electron microscope (SEM)etc. The results showed that, the tensile strength of CCF1/PEEKPT increased with increasing of the carbon fiber contentwithin 50-75 wt%. Meanwhile, the tensile strength of 50-65 wt% CCF2/PEEKPT had the same change trend, but thendecreased when the fiber content of composites was higher than 65 wt%. The storage modulus (E′) of composites increasedwith adding content of carbon fiber. The composites still maintained high deformation resistance when the temperature roseto 290 oC. Compared with pure PEEK, the crystallinity and crystallization rate of the composites both increased with theoccurrence of fiber inducing PEEK crystallization, but the crystallization onset temperature, crystallization temperature andmelting temperature of CCF/PEEKPT moved to low temperatures with adding of fiber content. In general, these observationssuggested that CCF hindered the movement of the polymer chain segment and constrained the spherulites growth of PEEKfor CCF/PEEKPT.
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