Ji-ping Sun

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A cost effective ZigBee-based wireless mine supervising system is presented in this article. This scheme used intelligent helmets as voice terminal and ultra-low-power nodes of wireless sensor network.The programme adopted ZigBee wireless technology to build wireless sensor networks, realized real-time surveillance with early-warning intelligence on(More)
Using dyadic green's function and the antenna surface boundary conditions, the integral equation of the antenna in a rectangular coal mine tunnel is established. The radiation modes of the line antenna are analyzed, and the unitary transmission powers distributing of electromagnetic wave transmission mode and the maximum transmission power mode are given.(More)
This paper reports a fluorescence chemosensor, N-(benzimidazol-2-yl)salicylaldimine (H2L), for Zn(II) and Al(III) ions. H2L has high selectivity for Al(III) in dimethyl sulfoxide (DMSO) and for Zn(II) in N,N-dimethylformamide (DMF). In methanol, Zn(II) and Al(III) could also be distinguished by H2L with different excitation wavelengths. The fluorescent(More)
An adaptive filter using long-range correlation for the removal of impulse noise from images was proposed. Impulse noise was detected by the method of local extremum at first. Then the background mean square error between signal pixels and noise pixels was computed in the definite search range, and the filtering process was going by the adaptive weight(More)
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