Abstract:I would also like to thank all of you who have contributed so much to the completion of this thesis. In particular, I would like to express my gratitude to Sabrina Bowen, who has greatly helped me with her English revisions during the process of writing high quality articles.Half of all the successes I have achieved in my life is due to the love and dedication of my beloved parents. My father, who died seven years ago, will surely smile when he sees me receive my PhD. I am dedicated, without giving up under an… Show more
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