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Hebei Normal Univ, Coll Phys, Shijiazhuang 050024, Peoples R China
Hebei Chem & Pharmaceut Coll, Dept Mech & Elect Engn, Shijiazhuang 050026, Peoples R China
Hebei Univ Sci & Technol, Sch Informat Sci & Engn, Shijiazhuang 050018, Peoples R China Hebei Normal Univ, Coll Phys, Shijiazhuang 050024, Peoples R China