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      • KCI등재

        Customer-based Concentration and Firm Innovation

        Huayu Shen,Ning Xia,Jun Zhang 한국증권학회 2018 Asia-Pacific Journal of Financial Studies Vol.47 No.2

        Based on a sample of listed companies in Shanghai and Shenzhen, China from 2007 to 2015, this paper discusses the relationship between customer concentration and corporate innovation. The results show that this relationship is nonlinear and U-shaped. In addition, this paper finds that when the bargaining power of large customers is weak and the level of supply chain integration is high, the U-shaped relationship becomes more significant. Additional analyses show that the U-shaped relationship between customer concentration and corporate innovation is more significant for non-state-owned enterprises and those with lower levels of cash holding.

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        Adsorption properties of Friedel’s salt for the nitrate in the landfill

        Dongsheng Shen,Jun Yao,Qingna Kong,Huayue Zhu,Zhen Zhang 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.2

        Adsorption characteristics of nitrate on Friedel’s salt under the landfill circumstance were investigated to explore the effect of Friedel’s salt on the migration of nitrate in the landfill. Friedel’s salt was synthesized by a coprecipitation method and characterized by XRD and FTIR spectroscopy. The kinetics and isotherm of the adsorption were studied. The effect of the variation of landfill circumstance on the adsorption was also discussed. The result showed that the adsorption capacity of Friedel’s salt for nitrate was 2.494mg g−1. The adsorption process was exothermic and could be well described by pseudo-second-order kinetics and Langmuir-Freundlich equation. Cl− could enhance the adsorption, while SO4 2−, PO4 3− and organic matter could restrict the adsorption. The results suggested that the migration of nitrate in the landfill could be altered by Friedel’s salt, which was related to the variation of the landfill circumstance.

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