This book includes 25 chapters, which are rewritten from 25 most representative publications, and aims to partially summarize our work and motivate further research in this field. All of these achievements stem from joint efforts of all members in our laboratory, including teachers and postgraduates participating in this field of research. We are especially grateful to these teachers for their contributions: Prof. Dr. Zheng-Bo He, Prof. Dr. Liang Qiao, Prof. Dr. Yu-Juan Zhang, Prof. Dr. Ting-Jing Li, Dr. Feng-Ling Si, Dr. Zhen-Tian Yan, Dr. Wen-Bo Fu, Dr. Yong Zhou, Dr. Qi-Yi He, Dr. Shu-Lin He, Dr. Shuang Ren, Dr. Yi-Yun Wei, Dr. Cao Zhou.