Recently, offshore renewable energy has received significant attentions from most oceanic countries. Its multiple disciplinary nature appears as a hot research spot. Among those resources, offshore wind has been exper...Recently, offshore renewable energy has received significant attentions from most oceanic countries. Its multiple disciplinary nature appears as a hot research spot. Among those resources, offshore wind has been experiencing a rapid growth with strong industrial and governmental support. Among the research topics related to offshore wind turbine, those related to efficiency and safety issue receive most attentions, and they cover hydrodynamics, aerodynamics, structural dynamics, elasticity and so on. Hydrodynamics is considered as the key of these research for offshore wind turbine. This is not only because it is the fundamental of ocean engineering, but also it is similar to low speed aerodynamics which is the key of wind turbine rotor. In order to provide a comprehensive understanding of the important problems of offshore wind turbine hydrodynamics, we briefly review the evolution of offshore wind turbine and discuss the hydrodynamics problem associated with the research and development activities.展开更多
An efficient route to the natural products bupleurynol and its analog（RB-2）,isolated from Bupleuri Radix,was established based on versatile intermediate（15）.In this synthetic route,Sonogashira and CadiotChodkiewic...An efficient route to the natural products bupleurynol and its analog（RB-2）,isolated from Bupleuri Radix,was established based on versatile intermediate（15）.In this synthetic route,Sonogashira and CadiotChodkiewicz coupling as well as Julia-Kocienski olefination are utilized as key steps.The highly efficient synthetic route provides opportunities to explore the biological behavior of bupleurynol and RB-2.展开更多
Three-dimensional morphology and formation process of icosahedral quasicrystal phase have been investigated in a melt-spun AI-18Mn alloy （in wt%）. Three distinct layers corresponding to varying temperature gradient ...Three-dimensional morphology and formation process of icosahedral quasicrystal phase have been investigated in a melt-spun AI-18Mn alloy （in wt%）. Three distinct layers corresponding to varying temperature gradient have been observed on the cross section of the ribbons. 3D morphologies of cellular and dendritic icosahedral phase have been obtained through electro-etching. A model has been proposed to describe the formation process of the icosahedral phase and a-A1 during the rapid solidification. The icosahedral phases are primarily precipitated from the melt into fine cellular and dendritic particles, and subsequently engulfed by the a-A1 which propagates in a planar morphology.展开更多
基金supported by the Ministry of Science and Technology of China(Grant No.2017YFE0132000)the National Natural Science Foundation of China(Grant No.11872248)supported by the Science and Technology on Underwater Test and Control Laboratory Foundation(Grant No.61424070603).
文摘Recently, offshore renewable energy has received significant attentions from most oceanic countries. Its multiple disciplinary nature appears as a hot research spot. Among those resources, offshore wind has been experiencing a rapid growth with strong industrial and governmental support. Among the research topics related to offshore wind turbine, those related to efficiency and safety issue receive most attentions, and they cover hydrodynamics, aerodynamics, structural dynamics, elasticity and so on. Hydrodynamics is considered as the key of these research for offshore wind turbine. This is not only because it is the fundamental of ocean engineering, but also it is similar to low speed aerodynamics which is the key of wind turbine rotor. In order to provide a comprehensive understanding of the important problems of offshore wind turbine hydrodynamics, we briefly review the evolution of offshore wind turbine and discuss the hydrodynamics problem associated with the research and development activities.
基金financially supported by National Natural Science Foundation of China(Nos.21402111,81473415)Basic research program of Shanxi Province(No.2015021039)+1 种基金Shanxi Scholarship Council of China(No.2015-020)science and technology innovation project of Shanxi Province(No.2016115)
文摘An efficient route to the natural products bupleurynol and its analog（RB-2）,isolated from Bupleuri Radix,was established based on versatile intermediate（15）.In this synthetic route,Sonogashira and CadiotChodkiewicz coupling as well as Julia-Kocienski olefination are utilized as key steps.The highly efficient synthetic route provides opportunities to explore the biological behavior of bupleurynol and RB-2.
基金financially supported by the National Natural Science Foundation of China(Nos.51274054, U1332115,51401044)the Keygrant Project of Chinese Ministry of Education(No.313011)+1 种基金the Science and Technology Planning Project of Dalian(No.2013A16GX110)the China Postdoctoral Science Foundation(No.2015T80248)
文摘Three-dimensional morphology and formation process of icosahedral quasicrystal phase have been investigated in a melt-spun AI-18Mn alloy （in wt%）. Three distinct layers corresponding to varying temperature gradient have been observed on the cross section of the ribbons. 3D morphologies of cellular and dendritic icosahedral phase have been obtained through electro-etching. A model has been proposed to describe the formation process of the icosahedral phase and a-A1 during the rapid solidification. The icosahedral phases are primarily precipitated from the melt into fine cellular and dendritic particles, and subsequently engulfed by the a-A1 which propagates in a planar morphology.
