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Pure S-waves in land P-wave source VSP data 被引量:2
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作者 Liu Yang Zhang Qinghong +1 位作者 Bao Leiying wei xiucheng 《Applied Geophysics》 SCIE CSCD 2007年第3期173-182,共10页
Conventional land vertical seismic profiling (VSP) exploration usually uses P-wave sources and three-component geophones for receivers, emphasizing P- and converted S-waves. Previous studies show that both dynamite ... Conventional land vertical seismic profiling (VSP) exploration usually uses P-wave sources and three-component geophones for receivers, emphasizing P- and converted S-waves. Previous studies show that both dynamite borehole shots and vertical vibrations from controllable seismic sources at the surface will produce relatively strong pure P-waves and weaker pure S-waves. Interfaces with a large Poisson's ratio difference have a positive influence on the formation of strong transmitted converted S-waves. By a comparative analysis of pure S-waves from sources and converted downgoing S-waves, we believe that the main frequency of pure S-waves is usually lower than pure P-waves while the main frequency of downgoing converted S-waves is close to that of P-waves. We have studied zero-offset and offset VSP data from land P-wave sources. Results show that pure S-waves commonly exist in these data with differences in wave intensity. S-wave velocity can be obtained from the P-wave source zero-offset VSP data. Finally, we discuss the bright future of joint application of VSP P-and S-waves and the full use of S-waves in P-wave source VSP data. 展开更多
关键词 Land VSP P-wave source pure S-wave
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Preparation and electrochemical performance of MWCNTs@MnO_2 nanocomposite for lithium ion batteries 被引量:2
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作者 LIU YingQi LI XiuWan +3 位作者 wei Zhiwei ZHANG LiPing wei xiucheng HE DeYan 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第6期1077-1080,共4页
Tubular nanocomposite with interconnected MnO2 nanoflakes coated on MWCNTs(MWCNTs@MnO2)was fabricated by an aqueous solution method at 80°C.Scanning electron microscopy,X-ray diffraction and galvanostatic charge-... Tubular nanocomposite with interconnected MnO2 nanoflakes coated on MWCNTs(MWCNTs@MnO2)was fabricated by an aqueous solution method at 80°C.Scanning electron microscopy,X-ray diffraction and galvanostatic charge-discharge tests were used to characterize the structures and electrochemical performances of the as-prepared nanocomposite.The capacity reaches 1233.6 mA h g-1 at a current density of 100 mA g-1 for the first discharge,and it can still maintain a capacity of 633.1mA h g-1 after 100 charge-discharge cycles.The results show that MWCNTs with good electrical conductivity as anchors of MnO2 can provide fast electron transport channels for MnO2 in the electrochemical reactions,and the as-prepared MWCNTs@MnO2 nanocomposite is a potential anode material for lithium ion batteries. 展开更多
关键词 manganese dioxide multi-walled carbon nanotubes NANOCOMPOSITE aqueous solution preparation electrochemical performances lithium ion battery
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Study on performance of PVDF piezoelectric film for the separator in Li-ion rechargeable cell 被引量:1
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作者 LIU YingQi LI XiuWan +1 位作者 wei xiucheng HE DeYan 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第11期2646-2648,共3页
The properties of piezoelectric PVDF films as separators are studied in NiO/Li electrodes Li-ion power cell.The results show that the PVDF piezoelectric film with excellent insulation is suitable for the environmental... The properties of piezoelectric PVDF films as separators are studied in NiO/Li electrodes Li-ion power cell.The results show that the PVDF piezoelectric film with excellent insulation is suitable for the environmental energy harvesting application.This is attributable to the compact structure of the piezoelectric PVDF film,and which make it has low leakage current and low charge-discharge current characteristics. 展开更多
关键词 PVDF piezoelectric film Li-ion rechargeable cell SEPARATOR
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