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Research on Economic Performance of Mining Enterprises Based on Stakeholders
Yunxiang Peng,Guixian Tian 한국정보처리학회 2023 Journal of information processing systems Vol.19 No.6
Conventional mining enterprises, particularly coal-related ones, exhibit substantial environmental pollution andhigh energy consumption, while those involved in new energy resources, such as lithium and cobalt, face severeresource shortages. Consequently, the economic efficiency of China’s mining enterprises is significantlyconstrained. This study examines data from nine representative listed enterprises in China spanning 2016 to2021. Employing the DEA model—i.e., BCC (VRS) model, we analyze the economic efficiency of miningenterprises with a focus on stakeholders. The paper provides static and dynamic analyses, offering insights andrecommendations for enhancing technology, reducing costs, and fortifying social relationships.
Deling Li,Guanghui Li,Qing Zhang,Guixian Su,Hongxia Zhang 한국고분자학회 2016 폴리머 Vol.40 No.4
Grafting polymerization of methyl methacrylate (MMA) from vinyl modified silica mediated by 2-(2-cyanopropyl) dithiobenzoate was first conducted. Surface radicals generated by the addition reaction of “free” polymeric radicals with surface vinyl could initiate reversible addition-fragmentation chain transfer (RAFT) grafting polymerization of MMA from silica. The RAFT grafting polymerization of MMA from silica exhibited a living character, evident from the linear relationship of grafting ratio with monomer conversion. Grafting polymerization rate appeared dependent on target molecular weight and initiator concentration because of diffusion-controlled RAFT process on silica. The PMMA-grafted silica allowed for a second-step grafting polymerization due to the existence of dithioester group on the chain ends of grafted PMMA. In this case, surface radicals were generated by the reaction of “free” polymeric radicals with the surface RAFT agents, which differed from the RAFT process of grafting polymerization from vinyl modified silica. This method could be extended to prepare a variety of block copolymers from silica.
Liu, Wenzhong,Cao, Guoqing,Zhou, Zhongxiao,Zhang, Guixian Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.5
Growth records over six generations of 686 pigs in SD-II Swine Line were used to estimate the genetic and phenotypic covariance functions for body weight as longitudinal data. A random regression model with Legendre polynomials of age as independent variables was used to estimate the (co)variances among the regression coefficients, thus the coefficients of genetic and permanent environmental covariance functions by restricted maximum likelihood employing the average information algorithm. The results showed that, using litter effect as additional random effect, a reduced order of fit did not describe the data adequately. For all five orders of fit, however, the change trends of genetic and phenotypic (co)variances were very similar from ${\kappa}$=3 onwards.