Xi University of Architecture and Technology, xi Jiaotong University, xidian university, Xi 'an University of Science and Technology, Shaanxi University of Science and Technology, Shaanxi Normal University, Xi University of Technology, Northwestern Polytechnical University, Chang 'an University, Xi Engineering University, Xi University of Technology, Yan 'an University, Baoji University of Arts and Sciences, Northwest A&F University and Northwest University.