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莫莉华 《科技情报开发与经济》2012,22(13):56-58,65
阐述了图书馆信息文化的含义和特征,分析了高职图书馆的特点和信息文化缺失的原因,指出构建图书馆信息文化应从营造信息文化氛围、构筑信息文化环境、进行信息文化教育、制定信息文化发展战略、创新文化体制等几方面入手。 相似文献
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Neutron-induced single event upset simulation in Geant4 for three-dimensional die-stacked SRAM
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Three-dimensional integrated circuits(3D ICs)have entered into the mainstream due to their high performance,high integration,and low power consumption.When used in atmospheric environments,3D ICs are irradiated inevitably by neutrons.In this paper,a 3D die-stacked SRAM device is constructed based on a real planar SRAM device.Then,the single event upsets(SEUs)caused by neutrons with different energies are studied by the Monte Carlo method.The SEU cross-sections for each die and for the whole three-layer die-stacked SRAM device is obtained for neutrons with energy ranging from 1 MeV to 1000 MeV.The results indicate that the variation trend of the SEU cross-section for every single die and for the entire die-stacked device is consistent,but the specific values are different.The SEU cross-section is shown to be dependent on the threshold of linear energy transfer(LETth)and thickness of the sensitive volume(Tsv).The secondary particle distribution and energy deposition are analyzed,and the internal mechanism that is responsible for this difference is illustrated.Besides,the ratio and patterns of multiple bit upset(MBU)caused by neutrons with different energies are also presented.This work is helpful for the aerospace IC designers to understand the SEU mechanism of 3D ICs caused by neutrons irradiation. 相似文献
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