Natural gas hydrate (NGH)is considered as one of the new clean energy sources of the 21st century with the highest potential.The environmental issues of NGH production have attracted the close attention of scientists ...Natural gas hydrate (NGH)is considered as one of the new clean energy sources of the 21st century with the highest potential.The environmental issues of NGH production have attracted the close attention of scientists in various countries.From May 10 to July 9,2017,the first offshore NGH production test in the South China Sea (SCS)was conducted by the China Geological Survey.In addition,environmental security has also been effectively guaranteed via a comprehensive environmental monitoring system built during the NGH production test.The monitoring system considered sea-surface atmosphere methane and carbon dioxide concentrations,dissolved methane in the sea water column,and the seafloor physical oceanography and marine chemistry environment.The whole process was monitored via multiple means, in multiple layers,in all domains,and in real time.After the production test,an environmental investigation was promptly conducted to evaluate the environmental impact of the NGH production test. The monitoring results showed that the dissolved methane concentration in seawater and the near-seabed environment characteristics after the test were consistent with the background values,indicating that the NGH production test did not cause environmental problems such as methane leakage.展开更多
This study reviews all South China Sea species belonging to the families Rathkeidae and Zancleopsidae. Morphological characters of Lizzia blondina Forbes, 1848 （formerly recorded as Podocoryne/Hydractinia minuta）, L...This study reviews all South China Sea species belonging to the families Rathkeidae and Zancleopsidae. Morphological characters of Lizzia blondina Forbes, 1848 （formerly recorded as Podocoryne/Hydractinia minuta）, L. gracilis （Mayer, 1900）, L. octostyla （Haeckel, 1879） and Podocorynoides minima （Trinci, 1903） （formerly recorded as Podocoryne/ Hydractinia minima） are redescribed. One new species, Zancleopsis oblongus Xu, Huang ＆ Wang, sp. nov. from South China Sea, is described and illustrated. The keys to all medusa genera of Rathkeidae and Zancleopsidae and to all species of Zancleopsis are presented. The type specimen is deposited in the Third Institute of Oceanography, State Oceanic Administration, China.展开更多
A highly novel and direct synthesis of benzoxazinones was developed via Cp*Co(Ⅲ)-catalyzed C-H activation and[3+3]annulation between sulfoxonium ylides and dioxazolones.The reaction is conducted under base-free condi...A highly novel and direct synthesis of benzoxazinones was developed via Cp*Co(Ⅲ)-catalyzed C-H activation and[3+3]annulation between sulfoxonium ylides and dioxazolones.The reaction is conducted under base-free conditions and tolerates various functional groups.Starting from diverse readily available sulfoxonium ylides and dioxazolones,a variety of benzoxazinones could be synthesized in one step in 32%-75%yields.展开更多
文摘Natural gas hydrate (NGH)is considered as one of the new clean energy sources of the 21st century with the highest potential.The environmental issues of NGH production have attracted the close attention of scientists in various countries.From May 10 to July 9,2017,the first offshore NGH production test in the South China Sea (SCS)was conducted by the China Geological Survey.In addition,environmental security has also been effectively guaranteed via a comprehensive environmental monitoring system built during the NGH production test.The monitoring system considered sea-surface atmosphere methane and carbon dioxide concentrations,dissolved methane in the sea water column,and the seafloor physical oceanography and marine chemistry environment.The whole process was monitored via multiple means, in multiple layers,in all domains,and in real time.After the production test,an environmental investigation was promptly conducted to evaluate the environmental impact of the NGH production test. The monitoring results showed that the dissolved methane concentration in seawater and the near-seabed environment characteristics after the test were consistent with the background values,indicating that the NGH production test did not cause environmental problems such as methane leakage.
基金supported by National Natural Science Foundation of China(41406216)Global Climate Change and Ocean Atmosphere Interaction Research(GASI-01-02-02-03,GASI-01-02-04,GASI-01-02-02-01)+2 种基金National Special Project on Gas Hydrate(GZH201100311)the Marine Biological Sample Museum of the Chinese Offshore Investigation and Assessmentthe National Basic Research Program of China(2011CB403604)
文摘This study reviews all South China Sea species belonging to the families Rathkeidae and Zancleopsidae. Morphological characters of Lizzia blondina Forbes, 1848 （formerly recorded as Podocoryne/Hydractinia minuta）, L. gracilis （Mayer, 1900）, L. octostyla （Haeckel, 1879） and Podocorynoides minima （Trinci, 1903） （formerly recorded as Podocoryne/ Hydractinia minima） are redescribed. One new species, Zancleopsis oblongus Xu, Huang ＆ Wang, sp. nov. from South China Sea, is described and illustrated. The keys to all medusa genera of Rathkeidae and Zancleopsidae and to all species of Zancleopsis are presented. The type specimen is deposited in the Third Institute of Oceanography, State Oceanic Administration, China.
基金financial support from the Hunan Provincial Innovation Foundation for Postgraduate(No.CX20190267)Natural Science Foundation of Hunan Province(No.2020JJ4171)。
文摘A highly novel and direct synthesis of benzoxazinones was developed via Cp*Co(Ⅲ)-catalyzed C-H activation and[3+3]annulation between sulfoxonium ylides and dioxazolones.The reaction is conducted under base-free conditions and tolerates various functional groups.Starting from diverse readily available sulfoxonium ylides and dioxazolones,a variety of benzoxazinones could be synthesized in one step in 32%-75%yields.
