A physically based numerical model to predict the microstructure evolution and yield strength of high Cu-to-Mg mass ratio Al-Cu-Mg-Ag alloys during the whole ageing process was developed.A thermodynamically-based prec...A physically based numerical model to predict the microstructure evolution and yield strength of high Cu-to-Mg mass ratio Al-Cu-Mg-Ag alloys during the whole ageing process was developed.A thermodynamically-based precipitation model,employing the classical nucleation and growth theories,was adapted to deal with the precipitation kinetics (evolution of radius and volume fraction of precipitates for Ω phase) of aged Al-Cu-Mg-Ag alloys.The model gives an estimation of the precipitation kinetics (evolution of radius and density of precipitates for both θ' and Ω phases) of the alloy.The strengthening model based on Orowan mechanism was deduced.The microstructural development and strength predictions of the model are generally in good agreement with the experimental data.展开更多
This paper focuses on how aging can affect performance of safety-related structures in nuclear power plant (NPP). Knowledge and assessment of impacts of aging on structures are essential to plant life extension analys...This paper focuses on how aging can affect performance of safety-related structures in nuclear power plant (NPP). Knowledge and assessment of impacts of aging on structures are essential to plant life extension analysis,especially performance to severe loadings such as loss-of-coolant-accidents or major seismic events. Plant life extension issues are of keen interest in countries (like the United States) which have a large,aging fleet of NPPs. This paper addresses the overlap and relationship of structure aging to severe loading performance,with particular emphasis on containment structures.展开更多
At present, the world＇s aging population is developing at an unprecedented rate, how to deal with the community service for the elderly has become a top priority. For it not only relates to the community＇s harmony b...At present, the world＇s aging population is developing at an unprecedented rate, how to deal with the community service for the elderly has become a top priority. For it not only relates to the community＇s harmony but also to the whole social＇s stability. This paper summarized some experiences and practices from some typical foreign countries on their community endowment, such as the British community care model, the Japan＇s aged care at home, the PACE mode of United States, the Germany＇s long-term care services, the Australian＇s old-age community security. On the basis of a comparative analysis, this paper concluded some experience and enlightenment of serving the old in abroad urban community, this include： Give full play to the function and role of the community in the pension, take law as safeguard on the implementation of community endowment, professional services, government-led and multiple subject participation, provide comprehensive and diversified service, etc. Combined with China＇s national conditions, this paper puts forward some countermeasures and suggestions in the end to further perfect China＇s elderly community service.展开更多
基金Project(2005CB623705-04) supported by the National Basic Research Program of ChinaProject(1810-752300020) supported by Central South University and Ministry of Education of China for the Domestic Exchange PhD student
文摘A physically based numerical model to predict the microstructure evolution and yield strength of high Cu-to-Mg mass ratio Al-Cu-Mg-Ag alloys during the whole ageing process was developed.A thermodynamically-based precipitation model,employing the classical nucleation and growth theories,was adapted to deal with the precipitation kinetics (evolution of radius and volume fraction of precipitates for Ω phase) of aged Al-Cu-Mg-Ag alloys.The model gives an estimation of the precipitation kinetics (evolution of radius and density of precipitates for both θ' and Ω phases) of the alloy.The strengthening model based on Orowan mechanism was deduced.The microstructural development and strength predictions of the model are generally in good agreement with the experimental data.
文摘This paper focuses on how aging can affect performance of safety-related structures in nuclear power plant (NPP). Knowledge and assessment of impacts of aging on structures are essential to plant life extension analysis,especially performance to severe loadings such as loss-of-coolant-accidents or major seismic events. Plant life extension issues are of keen interest in countries (like the United States) which have a large,aging fleet of NPPs. This paper addresses the overlap and relationship of structure aging to severe loading performance,with particular emphasis on containment structures.
文摘At present, the world＇s aging population is developing at an unprecedented rate, how to deal with the community service for the elderly has become a top priority. For it not only relates to the community＇s harmony but also to the whole social＇s stability. This paper summarized some experiences and practices from some typical foreign countries on their community endowment, such as the British community care model, the Japan＇s aged care at home, the PACE mode of United States, the Germany＇s long-term care services, the Australian＇s old-age community security. On the basis of a comparative analysis, this paper concluded some experience and enlightenment of serving the old in abroad urban community, this include： Give full play to the function and role of the community in the pension, take law as safeguard on the implementation of community endowment, professional services, government-led and multiple subject participation, provide comprehensive and diversified service, etc. Combined with China＇s national conditions, this paper puts forward some countermeasures and suggestions in the end to further perfect China＇s elderly community service.
