1. Shijiazhuang Campus of PLA Army Engineering University,Shijiazhuang, Hebei,China
2. Hebei Jiaotong vocational and technical college,Shijiazhuang, Hebei,China
3. Baotou Weifeng Rare Earth Electromagnetic Materials Co. Ltd.,Inner Mongolia, Baotou,China
4. Peoples Liberation Army Engineering University-Shijiazhuang,Shijiazhuang, Hebei,China