School of Science Changchun University of Science and Technology Changchun 130012 China;
School of Science Changchun University of Science and Technology Changchun 130012 China;
School of Science Changchun University of Science and Technology Changchun 130012 China;
School of Physical Science and Technology Baotou Teachers' College Baotou 014030 China;
School of Science Changchun University of Science and Technology Changchun 130012 China;