Open access peer-reviewed chapter
By Qi-Ye Wen, Huai-Wu Zhang, Qing-Hui Yang, Zhi Chen, Bi-Hui Zhao, Yang Long and Yu-Lan Jing
Submitted: May 26th 2011Reviewed: January 12th 2012Published: May 16th 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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