In this study, we construct one 2-dimensional tidal simulation, using an unstructured Finite Volume Coastal Ocean Model （FVCOM）. In the 2-D model, we simulated the tidal turbines through adding additional bottom dra...In this study, we construct one 2-dimensional tidal simulation, using an unstructured Finite Volume Coastal Ocean Model （FVCOM）. In the 2-D model, we simulated the tidal turbines through adding additional bottom drag in the element where the tidal turbines reside. The additional bottom drag was calculated from the relationship of the bottom friction dissipation and the rated rotor efficiency of the tidal energy turbine. This study analyzed the effect of the tidal energy turbine to the hydrodynamic environment, and calculated the amount of the extractable tidal energy resource at the Guishan Hangmen Channel, considering the rotor wake effect.展开更多
Melting and solidification of lunar regolith are pivotal for comprehending the evolutionary dynamics of lunar volcanism,geology,and impact history.Additionally,insights gained from these processes can contribute to th...Melting and solidification of lunar regolith are pivotal for comprehending the evolutionary dynamics of lunar volcanism,geology,and impact history.Additionally,insights gained from these processes can contribute to the advancement of in situ resource utilization technologies,for instance additive manufacturing and resource extraction systems.Herein,we conduct the direct observation of the melting and rapid solidification of lunar particles returned by the Chang'E 5 mission.The melting temperature and melting sequence were obtained.Bubble generation,growth,and release were clearly observed,with a maximum bubble diameter of 5μm,which is supposed to be according to the release of volatiles that embedded in the particles.During the solidification process,evident crystallization occurred with incremental crystal growth rate approximately of 27 nm/s.Scanning electron microscopy and energy-dispersive x-ray spectroscopy results verified that the Fe-rich mineral crystalizes first.These results would improve the understanding of the evolution of lunar volcanism,geology,and impact history.展开更多
Introduction:Over the past two decades,China has experienced rapid economic development,which has not only led to a rapid increase in the use of raw materials but has also created environmental problems.This research ...Introduction:Over the past two decades,China has experienced rapid economic development,which has not only led to a rapid increase in the use of raw materials but has also created environmental problems.This research analyzes the environmental impacts of resource extraction in China at the provincial level,and fully considers the environmental impact of various resources extraction.In addition,it is the first time to quantitatively study the spatial pattern and evolution characteristics of the environmental impacts of China’s resource extraction from multiple perspectives by means of spatial visualization.Outcomes:The results showed that the center of gravity of abiotic depletion potential(ADP)moved northwest,respiratory inorganics(RI)moved southwest and global warming potential(GWP)moved west.The results of the standard deviation ellipse showed that RI and GWP varied over time and space,while ADP showed a discrete trend.In addition,the distribution of the four in the northeast-southwest direction became more prominent.Conclusion:To mitigate the environmental impacts of resource extraction,we recommend that regional governments implement measures to control environmental impacts in the provinces within the distributed ellipse and design targeted policies based on actual conditions.展开更多
基金The Public Science and Technology Research Funds Projects of Ocean under contract No.201305031
文摘In this study, we construct one 2-dimensional tidal simulation, using an unstructured Finite Volume Coastal Ocean Model （FVCOM）. In the 2-D model, we simulated the tidal turbines through adding additional bottom drag in the element where the tidal turbines reside. The additional bottom drag was calculated from the relationship of the bottom friction dissipation and the rated rotor efficiency of the tidal energy turbine. This study analyzed the effect of the tidal energy turbine to the hydrodynamic environment, and calculated the amount of the extractable tidal energy resource at the Guishan Hangmen Channel, considering the rotor wake effect.
基金supported by National Natural Science Foundation of China(Grant No.U22B2092).
文摘Melting and solidification of lunar regolith are pivotal for comprehending the evolutionary dynamics of lunar volcanism,geology,and impact history.Additionally,insights gained from these processes can contribute to the advancement of in situ resource utilization technologies,for instance additive manufacturing and resource extraction systems.Herein,we conduct the direct observation of the melting and rapid solidification of lunar particles returned by the Chang'E 5 mission.The melting temperature and melting sequence were obtained.Bubble generation,growth,and release were clearly observed,with a maximum bubble diameter of 5μm,which is supposed to be according to the release of volatiles that embedded in the particles.During the solidification process,evident crystallization occurred with incremental crystal growth rate approximately of 27 nm/s.Scanning electron microscopy and energy-dispersive x-ray spectroscopy results verified that the Fe-rich mineral crystalizes first.These results would improve the understanding of the evolution of lunar volcanism,geology,and impact history.
基金This research was supported by the National Natural Science Foundation of China(41871204,41701627 and 41971255)Fundamental Research Funds for the Central Universities(N172504026,N182502045)。
文摘Introduction:Over the past two decades,China has experienced rapid economic development,which has not only led to a rapid increase in the use of raw materials but has also created environmental problems.This research analyzes the environmental impacts of resource extraction in China at the provincial level,and fully considers the environmental impact of various resources extraction.In addition,it is the first time to quantitatively study the spatial pattern and evolution characteristics of the environmental impacts of China’s resource extraction from multiple perspectives by means of spatial visualization.Outcomes:The results showed that the center of gravity of abiotic depletion potential(ADP)moved northwest,respiratory inorganics(RI)moved southwest and global warming potential(GWP)moved west.The results of the standard deviation ellipse showed that RI and GWP varied over time and space,while ADP showed a discrete trend.In addition,the distribution of the four in the northeast-southwest direction became more prominent.Conclusion:To mitigate the environmental impacts of resource extraction,we recommend that regional governments implement measures to control environmental impacts in the provinces within the distributed ellipse and design targeted policies based on actual conditions.
