Papers by Author: Wen Qing Shi

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Authors: Qing Xiang Chen, Zheng Ye Xiong, Wen Qing Shi, Jing Yun Peng
Abstract: In order to provide some useful suggestions for the development of selective light fishing techniques, fishing experiments with two sets of Light Emission Diode (LED) lamps were carried out in China coastal waters. Amberfish (Decapterus maruadsi) and Horse Mackerel (Trachurus japonicas) catches of white and blue LED lamps were analyzed, t-test analysis of the catches’ data confirmed that the white light LED lamp is significantly better than the blue light LED lamp for catching amber fish and Horse Mackerel. The reasons for the differences of catches were also given in the paper.
Authors: Jing Min Chen, Zheng Ye Xiong, Qiang Tang, Zhan Mi Peng, Wen Qing Shi, Yu Jun Feng
Abstract: Quartz grains were extracted from volcano ash beside Huguang Maar Lake, and the thermoluminescence (TL) of the grains was measured. Based on the thermoluminescence data of quartz the paleodose of volcanic ash beside Huguang Maar Lake was calculated with sensitized revise technique. The calculated TL dose depending on TL about 315C is 75.3±4.8Gy, while the calculated dose depending on TL about 407C is 115±8Gy. A physical model is set up to analyze the difference of the two calculation doses, and it can be seen that the latter is relatively veracious.
Authors: Zheng Ye Xiong, Ping Ding, Qiang Tang, Jing Min Chen, Wen Qing Shi
Abstract: Lithium tetraborate (LBO or LTO) single crystal seems to be a promising new material for thermoluminescent dosimeter (TLD) and SAW resonators. In the present work, thermoluminescence (TL) characteristic and TL spectra of LTO single crystal grown by Bridgman method were measured, the kinetic parameters of TL traps were calculated, and TL spectra were analyzed. The result shows: The primary glow peaks are at about 186oC and 313oC. The activation energies of the traps corresponding to the two TL peaks are 0.96eV and 1.56eV, and the frequency factors are about 7.94×109s-1 and 6.31×1012s-1. The TL spectra of LTO crystal extends from 350nm to 460nm, and has its maximum at about 381nm. The intrinsic luminescent centers can send the energy from crystal lattice to Cu+ ions, because the activation energies of two are quite similar, and the Cu+ ions become new luminescent centers to increase TL sensitivity when Cu ions are doped into LTO crystals.
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