This paper is dedicated to Professor LIU YouCheng on the occasion of his 90th birthday. This work was supported by the National High-Tech Re- search & Development Program of China (2007AAO2Z143).
<正>The highly pathogenic avian influenza virus H5N1 attracted much attention in 2009,when the human death toll due to infection with this virus in China create
Based on the principle and fabrication of the optical waveguide laser,and through the configuration of the energy level of Er3+/Yb3+ co-doped system,the time-de