Z. L. Wang thanks the support from NSF, the NASA Vehicle Systems Program and Department of Defense Research and Engineering (DDR&E), and the Defense Advanced Research Projects Agency (Award No. N66001-04-1-8903). N. S. X. thanks the support of the project from the NSF of China (Grant No. 50 021 202, 50 329 201, and 90 201 020), Ministry of Science and Technology of China (Grant No. 2003CB314700 and 2002AA313010), Ministry of Education of China, Science and Technology Department of Guangdong Province, Education Department of Guangdong Province, and Science and Technology Department of Guangzhou City. J. Zhou thanks the KAISI FUND from SunYat-Sen (Zhongshan) University. We thank the help of Y. Ding, Rusen Yang, Jin Liu, Wenjie Mai, Y. Y. Zhang, and Gang Bao. Supporting Information is available online from Wiley InterScience or from the author.