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Our new method makes use of a CAD-based automatic modeling tool, MCAM, for geometry modeling and ray tracing of particle transport in method of characteristics (MOC). It was found that it could considerably enhance the capability of MOC to deal with more complicated models for neutron transport calculation. In our study, the diamond-difference scheme was applied to MOC to reduce the spatial discretization errors of the fiat flux approximation. Based on MCAM and MOC, a new 2D MOC code was developed and integrated into the SuperMC system, which is a Super Multi-function Computational system for neutronics and radiation simulation. The numerical results demonstrated the feasibility and effectiveness of the new method for neutron transport calculation in MOC. 相似文献
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商务部近日表示,1999-2005年,我国累计引进技术近5万项,总金额超过1000亿美元,其中技术费达623亿美元,占合同金额的57.6%。2005年我国引进技术支出费用达118.3亿美元,占技术引进合同总金额的62.3%,比1999年提高31个百分点。这表明在政府政策的引导下,企业重设备轻技术的技术引进观念已得到转变,软技术在我国技术引进中逐渐占据主导地位。 相似文献
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近日,中国政府网举行网上座谈会。届时,农业部、商务部、卫生部、工商总局、质检总局、食品药品监管局等6部门相关司局负责人,以及有关专家和2位消费者代表到中国政府网,以“做好食品安全工作”为主题进行网上座谈。 相似文献
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