由于图形处理器GPU(Graphics Processing Unit)最近几年迅速发展,国内外学者已经将基于GPU的通用计算作为一个新的研究领域[1,2]。在研究国外最新文献的基础上,分析了美国NVIDIA公司推出的Cg(C for Graphics)开发语言本身的特性,阐述了...由于图形处理器GPU(Graphics Processing Unit)最近几年迅速发展,国内外学者已经将基于GPU的通用计算作为一个新的研究领域[1,2]。在研究国外最新文献的基础上,分析了美国NVIDIA公司推出的Cg(C for Graphics)开发语言本身的特性,阐述了在GPU平台上利用Cg语言编写的分组加密程序需要特殊处理的地方,最后以DES算法为实例详细描述了编程的方法和实现过程。展开更多
X80 pipeline steel produced by TMCP has high strength and high toughness with ultrafine grain microstructure. The mi-crostructure coarsens and the toughness worsens at the coarse grained (CG) HAZ apparently after weld...X80 pipeline steel produced by TMCP has high strength and high toughness with ultrafine grain microstructure. The mi-crostructure coarsens and the toughness worsens at the coarse grained (CG) HAZ apparently after weld simulation. The experimental results indicated that the bainitic ferrite and the second phases formed at cooling are differently as the variation of carbon in base metal. In low carbon steels, the bainitic ferrite laths are long and narrow, the second phases are complex including residual austenite, martensite, the M-A constituent and the Fe3C carbide. The formation of Fe3C carbide is the main reason of the poor toughness in CG HAZ. The ultralow carbon in base metal, however, can improve the CG HAZ toughness through restraining the formation of carbides, decreasing the M-A constituent, increasing the residual austenite content, which are beneficial to the CG HAZ toughness.展开更多
文摘由于图形处理器GPU(Graphics Processing Unit)最近几年迅速发展,国内外学者已经将基于GPU的通用计算作为一个新的研究领域[1,2]。在研究国外最新文献的基础上,分析了美国NVIDIA公司推出的Cg(C for Graphics)开发语言本身的特性,阐述了在GPU平台上利用Cg语言编写的分组加密程序需要特殊处理的地方,最后以DES算法为实例详细描述了编程的方法和实现过程。
基金The present work was financially supported by a China National“973”Grant under Contract No.G1998061511.
文摘X80 pipeline steel produced by TMCP has high strength and high toughness with ultrafine grain microstructure. The mi-crostructure coarsens and the toughness worsens at the coarse grained (CG) HAZ apparently after weld simulation. The experimental results indicated that the bainitic ferrite and the second phases formed at cooling are differently as the variation of carbon in base metal. In low carbon steels, the bainitic ferrite laths are long and narrow, the second phases are complex including residual austenite, martensite, the M-A constituent and the Fe3C carbide. The formation of Fe3C carbide is the main reason of the poor toughness in CG HAZ. The ultralow carbon in base metal, however, can improve the CG HAZ toughness through restraining the formation of carbides, decreasing the M-A constituent, increasing the residual austenite content, which are beneficial to the CG HAZ toughness.
