I thank my tutor and professor. Their rigorous and meticulous style has always been an example for me to work and study. Their persuasive teaching and eclectic thinking have given me endless inspiration.

Thanks to my teacher, every experimental detail and every data of this paper can't be separated from your careful guidance. Your cheerful personality and tolerant attitude helped me to integrate into our new laboratory quickly.

Thank my roommates for coming to this strange city from their distant hometown. It is you and I who maintain the brotherhood between each other and the harmony of the dormitory. It's been four years, as if it were yesterday. In the past four years, we have never blushed, quarreled or had anything unhappy that we were worried about before going to college.

It's just that it's rare for everyone to get together for New Year's Eve dinner every year. It doesn't matter. Let's go our separate ways. Take care. I hope I can go to America safely, stay in Fudan happily and leave our dormitory happily. I will remember the days when we were together all my life.

Thanks to my parents, I can't get anything from them, and I can't repay their kindness in raising me. My greatest wish is that you will be healthy and happy forever. When the paper is about to be completed, my mood can't be calm. How many respectable teachers, classmates and friends gave me wordless help from the beginning to the smooth completion of the thesis? Please understand my sincere thanks.