The School of Mathematics and Physics Lanzhou Jiaotong University Lanzhou 730070 China;
The School of Mathematics and Physics Lanzhou Jiaotong University Lanzhou 730070 China;
The School of Mathematics and Physics Lanzhou Jiaotong University Lanzhou 730070 China;
Institute of Materials Science Technische Universitat Darmstadt 64287 Darmstadt Germany;
Key Laboratory of Mechanics on Western Disaster and Environment Ministry of Education College of Civil Engineering and Mechanics Key Laboratory of Special Function Materials and Structure Design of Ministry of Education Lanzhou University Lanzhou 730000 China;
The School of Mathematics and Physics Lanzhou Jiaotong University Lanzhou 730070 China;
School of Physical Science and Technology Guangxi University Nanning 530004 China;