Zero-dimensional carbon dots have emerged as important nanofillers for the separation membrane due to their small specific size and rich surface functional groups.This study proposed a strategy based on hydrophobic ca...Zero-dimensional carbon dots have emerged as important nanofillers for the separation membrane due to their small specific size and rich surface functional groups.This study proposed a strategy based on hydrophobic carbon dots(HCDs)to regulate water channels for an efficient forward osmosis(FO)membrane.Thin-film composite(TFC)membranes with superior FO performance are fabricated by introducing HCDs as the nanofiller in the polyacrylonitrile support layer.The introduction of HCDs promotes the formation of the support layer with coherent finger-like hierarchical channels and micro-convex structure and an integrated polyamide active layer.Compared to the original membrane,TFC-FO membrane with 10 wt%HCDs exhibits high water flux(15.47 L m^(-2)h^(-1))and low reverse salt flux(2.9 g m^(-2)h^(-1))using 1 mol/L Na Cl as the draw solution.This improved FO performance is attributed to the lower structural parameters of HCDs-induced water channels and alleviated internal concentration polarization.Thus,this paper provides a feasible strategy to design the membrane structure and boost FO performance.展开更多
In the past decades, two large scale coastal engineering projects have been carried out in the Deep Bay surrounded by Shenzhen City and Hong Kong Special Administrative Region. One project is Shenzhen River channel re...In the past decades, two large scale coastal engineering projects have been carried out in the Deep Bay surrounded by Shenzhen City and Hong Kong Special Administrative Region. One project is Shenzhen River channel regulation and the other is the sea reclamation along the seashore on the Shenzhen side. The two projects are very close to the two national nature reserves, specifically Futian in Shenzhen and Mai Po in Hong Kong, which are important wetland ecosystems worldwide. This paper aims to identify and monitor the mangrove wetland changes with time series of Landsat Thematic Mapper images pre and post to the two engineering projects being launched. Coupled analysis of the image interpretation results and tidal data acquired at the same time in the context of the two works reveals that the mangrove wetland area has increased from year 1989 to 1994, and has changed little from year 1994 to 2002. Binary coding is applied to reveal the distribution image of mangrove at each phase, and the coding image shows that the construction of the two coastal engineering projects has caused frequent changes in mangrove spatial distribution. The study also shows that the change is not significant regarding to the precision of the method and the natural evolution of mangrove wetland, and the projects do not cause apparently influences upon the two national mangrove conservation zones at least for the research time period.展开更多
Ryanodine receptors (RyR) are the major Ca2+ release channels in both cardiac and skeletal muscle, they play a crucial role in the Ca2+ signaling pathway that govern the
基金financially supported by the National Key Research and Development Project(No.2019YFC1907801)the Hunan Provincial Science and Technology Plan Projects(No.2019JJ30031)the Innovation-Driven Project of Central South University(No.2020CX007)。
文摘Zero-dimensional carbon dots have emerged as important nanofillers for the separation membrane due to their small specific size and rich surface functional groups.This study proposed a strategy based on hydrophobic carbon dots(HCDs)to regulate water channels for an efficient forward osmosis(FO)membrane.Thin-film composite(TFC)membranes with superior FO performance are fabricated by introducing HCDs as the nanofiller in the polyacrylonitrile support layer.The introduction of HCDs promotes the formation of the support layer with coherent finger-like hierarchical channels and micro-convex structure and an integrated polyamide active layer.Compared to the original membrane,TFC-FO membrane with 10 wt%HCDs exhibits high water flux(15.47 L m^(-2)h^(-1))and low reverse salt flux(2.9 g m^(-2)h^(-1))using 1 mol/L Na Cl as the draw solution.This improved FO performance is attributed to the lower structural parameters of HCDs-induced water channels and alleviated internal concentration polarization.Thus,this paper provides a feasible strategy to design the membrane structure and boost FO performance.
文摘In the past decades, two large scale coastal engineering projects have been carried out in the Deep Bay surrounded by Shenzhen City and Hong Kong Special Administrative Region. One project is Shenzhen River channel regulation and the other is the sea reclamation along the seashore on the Shenzhen side. The two projects are very close to the two national nature reserves, specifically Futian in Shenzhen and Mai Po in Hong Kong, which are important wetland ecosystems worldwide. This paper aims to identify and monitor the mangrove wetland changes with time series of Landsat Thematic Mapper images pre and post to the two engineering projects being launched. Coupled analysis of the image interpretation results and tidal data acquired at the same time in the context of the two works reveals that the mangrove wetland area has increased from year 1989 to 1994, and has changed little from year 1994 to 2002. Binary coding is applied to reveal the distribution image of mangrove at each phase, and the coding image shows that the construction of the two coastal engineering projects has caused frequent changes in mangrove spatial distribution. The study also shows that the change is not significant regarding to the precision of the method and the natural evolution of mangrove wetland, and the projects do not cause apparently influences upon the two national mangrove conservation zones at least for the research time period.
文摘Ryanodine receptors (RyR) are the major Ca2+ release channels in both cardiac and skeletal muscle, they play a crucial role in the Ca2+ signaling pathway that govern the
