Papers by Author: Shao Jie Wang

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Authors: Bo Wang, M. Zhang, W.H. Liu, Shao Jie Wang
Authors: Z.L. Peng, S.Q. Li, Y.Q. Dai, H. Liu, H.Q. Xie, Shao Jie Wang
Authors: Shao Jie Wang, Z. Tang, Z.Q. Chen, Z.Y. Wu, L. Ma
Authors: W.G. Hu, Z. Wang, Y.Q. Dai, Shao Jie Wang, Y.W. Zhao
Authors: Chun Qing He, Jun Cheng Wang, Jun Zhu, Shao Jie Wang
Abstract: A simple pulsed slow positron beam based on a Penning-trap has been designed and is being constructed in Wuhan University. The cooled positrons from the trap with very low energy dispersion are dumped and chopped to pulses of a few tens of ns in width. Positron pulses are bunched by adjusting the potential of drift tube using an arbitrary wave generator, then accelerated to the target. Influences of the pulse width, the energy dispersion of positrons etc. on the time resolution of bunched positron pulse are simulated. The result shows that lower energy dispersion of positrons leads to much narrower positron pulses, indicating that a trap-based slow positron beam has a great advantage in developing a pulsed slow positron beam.
Authors: Zhe Chen, W. Huang, Wen Yu, Peng Fei Fang, Shao Jie Wang, J. Xiong, Y.S. Xu
Abstract: The free volume property and intermolecular interaction (especially hydrogen bonding) of poly (ether-urethane) (PEU) irradiated by neutron under different atmosphere has been studied by positron annihilation lifetime spectroscopy (PALS) and Fourier transform infrared (FTIR). The results suggested that the hydrogen-bonding interactions and free volume property in PEU depended strongly on the neutron irradiation dose.
Authors: Yi Chu Wu, C.Q. Chen, Y.Q. Chen, Y. Hu, J. Cheng, Shao Jie Wang, Yan Ching Jean
Abstract: Hydrogen- and corrosion -related defects of pure iron and AISI 304 and 316 stainless steels were investigated by measuring Doppler broadening energy spectra of positron annihilation. The significant increase in S-parameter after corrosion in iron was interpreted as due to the formation of defects and voids during corrosion processes. However, a decrease of the S-parameter in AISI 304 and 316 stainless steels after corrosion was interpreted as dissolution of passivity oxide film. Furthermore, similar results in iron and stainless steels after hydrogen-charging were observed. Hydrogen damage between the surface and the bulk has a significant variation with depth. The larger increase in S-parameter near the surface after hydrogen-charging mainly comes from the formation of large-size defects (e.g. voids); however the increase in S-parameter in the bulk after hydrogen-charging mainly comes from the production of small-size defects.
Authors: Wan Chuan Qiu, Q. Dong, F.X. Gan, Shao Jie Wang
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