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磁屏蔽室内磁性样品所产生干扰磁场的探讨 被引量:2
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作者 葛坤朋 刘青松 朱日祥 《地球物理学进展》 CSCD 北大核心 2011年第3期843-849,共7页
磁屏蔽室内岩石和各种沉积物样品所受的地磁场影响可以被有效地压制,然而磁性样品本身也会产生次级干扰磁场.本文通过理论模拟计算,定量评估了这种次级干扰磁场的影响.结果发现无论是单个还是聚集在一起的磁性样品,其产生的干扰磁场一... 磁屏蔽室内岩石和各种沉积物样品所受的地磁场影响可以被有效地压制,然而磁性样品本身也会产生次级干扰磁场.本文通过理论模拟计算,定量评估了这种次级干扰磁场的影响.结果发现无论是单个还是聚集在一起的磁性样品,其产生的干扰磁场一般都低于磁屏蔽室的本底值(~300 nT).因此,弱磁性样品的相互影响可以忽略不计.这为进一步理解古地磁数据的可靠性提供了理论依据. 展开更多
关键词 磁学样品 磁屏蔽室 干扰磁场
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Laccase biosensor using magnetic multiwalled carbon nanotubes and chitosan/silica hybrid membrane modified magnetic carbon paste electrode 被引量:1
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作者 庞娅 曾光明 +3 位作者 汤琳 章毅 李贞 陈丽娟 《Journal of Central South University》 SCIE EI CAS 2011年第6期1849-1856,共8页
A simple and rapid strategy to construct laccase biosensor for determination of catechol was investigated. Magnetic multiwalled carbon nanotubes (MMCNT) which possess excellent capability of electron transfer were pre... A simple and rapid strategy to construct laccase biosensor for determination of catechol was investigated. Magnetic multiwalled carbon nanotubes (MMCNT) which possess excellent capability of electron transfer were prepared by chemical coprecipitation method. Scanning electron microscope (SEM) and vibrating sample magnetometer (VSM) were used to identify its surfacetopography and magnetization, respectively. Laccase was immobilized on the MMCNT modified magnetic carbon paste electrode by the aid of chitosan/silica (CS) hybrid membrane. Using current-time detection method, the biosensor shows a linear response related to the concentration of catechol in the range from 10-7 to 0.165×10-3 mol/L. The corresponding detection limit is 3.34×10-8 mol/L based on signal-to-noise ratios (S/N) ≥3 under the optimized conditions. In addition, its response current retains 90% of the original after being stored for 45 d. The results indicate that this proposed strategy can be expected to develop other enzyme-based biosensors. 展开更多
关键词 magnetic multiwalled carbon nanotubes PARAMAGNETISM chitosan/silica sol laccase biosensor catechol
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