Although I cannot disguise the pleasure I feel upon approaching the end of the my college life, the pleasure is only the latest part of the joy of my research life.

I have experienced in participating in many fascinating scientific adventures, adventures in which all my friends, mentors and colleagues have been fellow travelers. I would like to express my heartfelt thanks to them for the continuous guidance, support, and patience over the years because I have benefited significantly from these experienced and talented friends. Thanks to their efforts and inspiration as well as many others whom I lack space to name here.

Special thanks go towards Prof. Fu Shixiao and Prof. Yi Hong who motivate me, inspire me and especially help me start understanding how to approach the right direction of doing research as a passionate scientist and energetic engineer. Working with them is a hugely rewarding experience.