天然放射性核素活度γ能谱测量中若干问题的思考

在应用γ谱分析技术从事环境监测等研究工作中,天然放射性核素的活度测量是最通常的工作之一。然而,由于各种原因,测量工作中存在着很多问题。本文叙述了作者在这方面的一些观点。     

纳米监测技术调研及核技术运用可能性分析

纳米科学与技术经过几十年的发展,已经成为具有广阔前景的多学科交叉的科技前沿,本文结合纳米科技的发展状况,考虑纳米系统所面对的人体环境特点,分析了现有的核探测技术结合,运用于纳米系统监测的可能性,作出了最优选择分析。     

Effect of absorption boundary layer on nonlinear flow in low permeability porous media

Taking low permeability cores of Daqing oilfield for example,the flow characteristics at low velocity were studied with the self-designed micro-flux measuring instrument.Considering the throat distribution and capillary model,the thickness of fluid boundary layer under different pressure gradients was calculated,and the mechanism and influencing factors of nonlinear percolation were discussed.The results show that the percolation curve of ultra-low rocks is nonlinear,and apparent permeability is not a const...