Open access peer-reviewed chapter
By Shi Tianyun, Wang Yingjie, Li Ping, Guo Ge, Ma Xiaoning, Lu Wenlong, Wu Yanhua and Shi Yi
Submitted: June 2nd 2011Reviewed: February 6th 2012Published: April 20th 2012
© 2012 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution 3.0 License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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