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      저자 : Shanjun He (검색결과 3 건)
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        Preparation and thermodynamic equilibrium analysis of neodymium disilicate via sol-precipitation and sintering

        Shanjun Ke,Yanmin Wang,Zhidong Pan,He-Ping Zeng 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.3

        Neodymium disilicate powders were synthesized via a sol-precipitation method with different precipitants (i.e., ammonia,ammonium bicarbonate and urea) and subsequent sintering. The samples were characterized by X-ray diffraction. In addition,a theoretical relationship between neodymium ion concentrations in different precipitation equilibrium solutions was alsoinvestigated and analyzed based on thermodynamic equilibrium calculation. The results show that the precipitant type has animpact on the phase compositions of the precursors and the sintered products. In the synthesis, neodymium ions can becompletely precipitated as amorphous neodymium hydroxide with ammonia as a precipitate at pH 8~9. For ammoniumbicarbonate as a precipitate, the precursor type is related to both carbon concentration and pH value. The excessive hydroxideforms neodymium hydroxycarbonate in a heated urea solution. The possible formation mechanism of silicon sol in the presenceof different precipitants was discussed.

      • KCI등재

        Neodymium disilicate ceramic pigment synthesized by solid-state method with pre-grinding and mineralizer

        Shanjun Ke,Yanmin Wang,Zhidong Pan,He-Ping Zeng 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.3

        A ceramic pigment of neodymium disilicate (i.e., Nd2Si2O7) was synthesized via solid-state reaction with pre-grinding assistanceand a mineralizer. The effects of pre-grinding and mineralizer (i.e., lithium chloride, boric acid and calcium fluoride) on thephase, microstructure and coloring properties of ceramic pigment were investigated by differential thermal analysis, X-raydiffraction, scanning electron microscopy and reflectance spectra in the visible range from 400 nm to 700 nm, respectively. Theresults show that the reaction temperature of Nd2Si2O7 can be decreased by pre-grinding, and the temperature of forming soleNd2Si2O7 phase is further decreased by 200 oC when lithium chloride is used as a mineralizer. Boric acid as a mineralizer canlead to an uneven distribution of Nd and Si components. The sample synthesized with calcium fluoride as a mineralizer cannotobtain Nd2Si2O7 phase. Nd2Si2O7 can be synthesized effectively when lithium chloride is used as a mineralizer.

      • The Design of System about Cow Activity Based on SVM

        Weizheng Shen,Congcong Chen,Shuang Zheng,Shanjun He,Mingda Li 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.3

        In view of the cow extensive farming, which lacks modern management tools, the cow estrus determine are often laid off. In this paper, a cow behavioral characteristic is designed. The system collects X, Y, Z axis acceleration data through triaxial accelerometer ADXL345, by ZigBee wireless network and RS485 sent to the information center, it’s based on the support vector of binary tree to classify their behavior. The result shows, the algorithm for cow’s stationary and moving classification accuracy was 93.26%, a slight and sharp motion accuracy was 84.81%, It provides an effective basis in judging cows in heat or in physical abnormalities. That system contributes to the refinement of cows feeding and health culture,and has great significance for the stable and healthy development of the dairy industry.

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