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Articles by XU Zheng
Total Records ( 2 ) for XU Zheng
  Liu Zunxiong , Xu Zheng , Feng Xingle and Lu Zhaogan
  In current 4G system given in recent literatures, channel estimation overhead and complexity of Multi-User Detectors (MUD), may lead to bad performance in fast fading channel scenarios when large number of users exists. So, a novel 4G system with TDD/TDMA as duplex and wireless access is designed to reduce channel estimation spending and avoid MUD, as only one user can be active to communicate with base station. Under the requirement of 4G systems, radio frame structure is elaborately designed to fit for fast fading channel scenarios. The system architecture with consideration of link adaptations for a novel eigenmodes coupled universal space-time codes, is given and evaluated for performance of TDD/TDMA 4G systems. Results show the proposed TDD/TDMA 4G can meet the requirement of 4G system under the classical ITU channel profiles.
  YUAN Feng , MIAO Yong-Wang , LI Da-Lin , TANG Shou-Kun , XU Zheng , HUO Jin-Long and QI Hong
  The prolactin exerts obvious adjustment and control function for mammary gland development, lactation and milk protein gene expression in water buffalo. In this study the sequence features and polymorphisms of the exon 4 in prolactin gene were examined in 385 individuals which came from 12 river and swamp type buffalo populations using DNA direct sequencing and PCR-SSCP methods. The results showed that the sequence of exon 4 in prolactin gene was consists of 180 nucleotides, the fragment had high conservative character in different species. The e4. 109 C>T substitution was detected in nine swamp buffalo populations, and it was a silent mutation and was not associated with the traits of milk yield in buffalo. The PBA gene was the predominant gene in seven swamp type buffalo populations, while PBB gene was the dominant gene in Dehong and Fuzhong populations. The frequencies of PBA in swamp type buffalo was 0.400 − 0.917 and the average value was 0.629±0.049. The polymorphism wasn’t found in river buffalo, all the samples from river buffalo were holding nucleotides e4.109 C. The results indicate that there is distinct genetic differentiation between swamp and river type buffalo.
 
 
 
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