Shaanxi University of Science and Technology, Shaanxi University of Science and Technology, Shaanxi University of Science and Technology, Shaanxi University of Science and Technology, Shaanxi University of Science and Technology, Shaanxi University of Science and Technology, Shaanxi University of Science and Technology, Shaanxi University of Science and Technology, Shaanxi University of Science and Technology, Shaanxi University of Science and Technology, affiliation not provided to SSRN, Shaanxi Gildland Science and Technology Company Ltd. and Shaanxi Gildland Science and Technology Company Ltd.