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Articles by Sun Yan
Total Records ( 2 ) for Sun Yan
  Sun Yan and Zhang Yannan
  In the third generation communication system, all the wireless network use digitalize transfer. Thus the analog transmission to ever proposed fundamentally have changed. WCDMA is one of the three mainstream standards, whose demodulation is also fundamentally different with GSM. This study uses the MATLAB’s M files to model and simulate BPSK and QSPK which are used in WCDMA system, compared with 2ASK and 2FSK at the same time. The purpose of putting AWGN and Rayleigh fading in the different modulation system’s route is to obtain the power spectrum, eye pattern and error rate. At last, from the transmission rate, the bandwidth efficiency and anti-interference performance these aspects, the performance of BPSK, QPSK, 2ASK, 2FSK can be analysed.
  Sun Yan , Liu Jin Guo , Kong Yi Di , Hu Jia Sen and Zhang Xiao Ping
  Background and Objective: Lunar dust is a kind of fine particles exists on the surface of the moon and it has become one of the most important challenges in future space missions. Lunar dust is toxic but the understanding of lunar dust toxicity is very poor. The aim of this study was to investigate the acute lung injury induced by lunar soil simulant and the mechanism of toxicity. Materials and Methods: Wistar rats were randomly divided into four groups including saline control group (tracheal perfusion in a 1 mL volume), two Chinese Academy of Sciences-1(CAS-1) lunar soil simulant groups (tracheal perfusion with 7 and 0.7 mg, respectively in a 1 mL volume) and PM2.5 group (tracheal perfusion with 0.7 mg in a 1 mL volume). The levels of tumor necrosis factor alpha, interleukin 6, immunoglobulin A and immunoglobulin G in the bronchoalveolar lavage fluid were examined and the changes of malondialdehyde, glutathione peroxidase and superoxide dismutase in the lung tissue were later measured after 4 and 24 h. Results: The determination of the cytokines, immunoglobulin and the oxidative stress index in lung tissue showed that the significant immune and oxidative stress response in the respiratory system were caused by lunar soil simulant and the immune and oxidative stress response promoted each other, resulting in toxic effect on pulmonary parenchymal cells and membrane of rats. Conclusion: The overall results showed that the immune response and oxidative stress reaction induced by lunar soil simulant were significant in the respiratory system. They promote each other, so as to cause the toxic effects on the lung parenchyma cells and membrane tissues of rats.
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