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GH2907合金VIM+VAR 3t钢锭1190℃均质化过程中Nb和Si的扩散行为 被引量:4
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作者 王志刚 文嘉利 +3 位作者 杨贵新 郑振宇 廖凯 韩光炜 《特殊钢》 2021年第4期17-19,共3页
利用光学显微镜、扫描电镜等研究了GH2907(0.02C,38.20Ni,13.92Co,4.92Nb,1.60Ti,0.32Si)合金Φ508 mm 3 t钢锭Nb和Si在1190℃的扩散规律。研究表明,GH2907合金Φ508 mm钢锭的枝晶间距大约110μm,Nb和Si在1190℃的表观扩散系数分别为D=(... 利用光学显微镜、扫描电镜等研究了GH2907(0.02C,38.20Ni,13.92Co,4.92Nb,1.60Ti,0.32Si)合金Φ508 mm 3 t钢锭Nb和Si在1190℃的扩散规律。研究表明,GH2907合金Φ508 mm钢锭的枝晶间距大约110μm,Nb和Si在1190℃的表观扩散系数分别为D=(0.704±0.041)×10^(-14) m^(2)/s,和D=(1.870±0.511)×10^(-14) m^(2)/s。理论计算表明,1190℃Nb扩散44.8~50.3 h,Si扩散14.0~24.5 h可使其残余偏析指数δi达到0.02。 展开更多
关键词 GH2907合金 1190扩散 表观扩散系数 偏析
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Some Remarks on the Individual Contribution to Climate Change 被引量:1
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作者 Andreas Oberheitmann 《American Journal of Climate Change》 2013年第3期198-202,共5页
Climate change is one of the most important challenges of the 21st Century. As greenhouse gas concentration of the atmosphere has reached the 400ppm threshold of a 2°C global warming on 9 May 2013 and irreversibl... Climate change is one of the most important challenges of the 21st Century. As greenhouse gas concentration of the atmosphere has reached the 400ppm threshold of a 2°C global warming on 9 May 2013 and irreversible tipping points of the climatic system at some point of time have got even more likely, the question of the individual contribution to climate change becomes more and more virulent. For a long time, the absorption capacity of the environment has been regarded as limitless, and based on this perception, the economic entities used the environment for hundreds of years without constraints. Today, with progress of scientific knowledge, we are now aware of the possible negative impacts of climate change to environmental, economic and social systems on Earth. This awareness, however, did not lead to a significant change of individual behavior, because the perceived individual contribution to both the anthropogenic cause of climate change and its mitigation is still regarded as marginal. To encounter this misperception or “diffusion of environmental responsibility”, this article presents an alternative calculation of the individual contribution to climate change taking the incremental approach to a tipping point or a 2°C global warming threshold into account. 展开更多
关键词 Climate Change Individual Contribution Tragedy of the Commons diffusion of Environmental Responsibility Tipping Points 2 Global Warming
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