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Ningtao Wang,Tingting Shi,Ke Peng,Zhipeng Lian,Yiyong Li,Qing Wang,Wen Chen,Bolin Huang 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.4
Fuzzy logic model and entropy model are useful for the geohazard susceptibility zonation in Jianshi County of Qingjiang River Basin. In this paper, the same impact factors were chosen and the geohazard samples were considered in two cases with quantitative analysis method. The first case 162 geohazards chosen as samples and the other one all of 182 geohazards chose as samples. The authors completed the susceptibility zonation in the two different cases using the two models in order to analysis the effects of the two models. The results of the two models in different cases were almost the same in space, except small differences in some areas. The entropy model was more accurate for the analysis of relationship between impact factors and geohazards, but not stable for different geohazard samples. The fuzzy logic model was better for less geohazard samples. According to the analysis process, it was found that the fuzzy γ operation was the best which was defined in terms of the fuzzy algebraic product and the fuzzy algebraic sum. The results of fuzzy logic model were most useful when γ was 0.20. The fuzzy logic model and entropy model were useful for the geohazard susceptibility which was scientific and useful for the government to manage the geohazards and make the preliminary development plans.
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Wang Hanming,Zhao Jinghong,Guo Guoqiang,Chen Hansi,Xiong Yiyong,Yan Sinian 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2
Due to its simple structure, the linear induction motor provides a linear driving force without any intermediate conversion devices. Linear induction motors are gradually used in various applications, including rail transit and the national defense industry. However, linear induction motors are affected by the end-effect phenomenon and suffer from problems such as low efficiencies and low power factors. In this paper, to optimize the performance of short primary double-sided linear induction motors (SP-DLIMs), first, a new analytical model is established based on an equivalent circuit considering both transverse and longitudinal end effects. Second, to analyze the impact of main parameters on the output characteristics of SP-DLIMs, a simple iterative design method (IDM) is presented. Third, a multi-objective optimal design method is proposed to optimize the efficiency, power factor and tooth weight of SP-DLIMs, with proposed design constraints and four different optimization problems. Moreover, an improved differential evolutionary (IDE) algorithm is proposed to optimize the design. A comparison of the results proved that the IDE yielded a competitive performance to those of other advanced heuristic algorithms. Finally, a three-dimensional time-stepping finite-element method was utilized to verify the validity of the optimization results.
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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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