Monitoring the ecology and physiology of corals,sediments,planktons,and microplastic at a suitable spatial resolution is of great importance in oceanic scientific research.To meet this requirement,an underwater micros...Monitoring the ecology and physiology of corals,sediments,planktons,and microplastic at a suitable spatial resolution is of great importance in oceanic scientific research.To meet this requirement,an underwater microscope with an electrically controlled variable lens was designed and tested.The captured microscopic images of corals,sediments,planktons,and microplastic revealed their physical,biological,and morphological characteristics.Further studies of the images also revealed the growth,degradation,and bleaching patterns of corals;the presence of plankton communities;and the types of microplastics.The imaging performance is majorly influenced by the choice of lenses,camera selection,and lighting method.Image dehazing,global saturation masks,and image histograms were used to extract the image features.Fundamental experimental proof was obtained with micro-scale images of corals,sediments,planktons,and microplastic at different magnifications.The designed underwater microscope can provide relevant new insights into the observation and detection of the future conditions of aquatic ecosystems.展开更多
Coral reef-like Ni/Al2O3 catalysts were prepared by co-precipitation of nickel acetate and aluminium nitrate with sodium carbonate aqueous solution in the medium of ethylene glycolye.Methanation of syngas was carried ...Coral reef-like Ni/Al2O3 catalysts were prepared by co-precipitation of nickel acetate and aluminium nitrate with sodium carbonate aqueous solution in the medium of ethylene glycolye.Methanation of syngas was carried out over coral reef-like Ni/Al2O3 catalysts in a continuous flow type fixed-bed reactor.The structure and properties of the fresh and used catalysts were studied by SEM,N2 adsorption-desorption,XRD,H2-TPR,O2-TPO,TG and ICP-AES techniques.The results showed that the coral reef-like Ni/Al2O3 catalysts exhibited better activity than the conventional Ni/Al2O3-H2O catalysts.The activities of coral reef-like catalysts were in the order of Ni/Al2O3-673Ni/Al2O3-573Ni/Al2O3- 473Ni/Al2O3-773.Ni/Al2O3-673-EG catalyst showed not only good activity and improved stability but also superior resistance to carbon deposition,sintering,and Ni loss.Under the reaction conditions of CO/H2（molar ratio）=1：3,593 K,atmospheric pressure and a GHSV of 2500 h-1,CH4 selectivity was 84.7%,and the CO conversion reached 98.2%.展开更多
On the basis of the three-dimensional(3D)random aggregate&mortar two-phase mesoscale finite element model,C++programming was used to identify the node position information of the interface between the aggregate an...On the basis of the three-dimensional(3D)random aggregate&mortar two-phase mesoscale finite element model,C++programming was used to identify the node position information of the interface between the aggregate and mortar elements.The nodes were discretized at this position and the zero-thickness cohesive elements were inserted.After that,the crack energy release rate fracture criterion based on the fracture mechanics theory was assigned to the failure criterion of the interface transition zone(ITZ)elements.Finally,the three-phase mesomechanical model based on the combined finite discrete element method(FDEM)was constructed.Based on this model,the meso-crack extension and macro-mechanical behaviour of coral aggregate concrete(CAC)under uniaxial compression were successfully simulated.The results demonstrated that the meso-mechanical model based on FDEM has excellent applicability to simulate the compressive properties of CAC.展开更多
继6月份推出了MetalvacG金属纸之后,西班牙Lecta纸业近日又推出了新型自然白Coral Book Natural 1.2纸种(图1),这种纸是Coral Book系列品种之一,是一种未涂布化学浆纸,主要用于出版印刷行业。Coral Book Natural 1.2纸种主打优良的可印...继6月份推出了MetalvacG金属纸之后,西班牙Lecta纸业近日又推出了新型自然白Coral Book Natural 1.2纸种(图1),这种纸是Coral Book系列品种之一,是一种未涂布化学浆纸,主要用于出版印刷行业。Coral Book Natural 1.2纸种主打优良的可印刷性,定量有70g/m2、80g/m2、90g/m2、100g/m2、110g/m2和120g/m2等类型,使用天然可再生原材料生产,纸浆进行了无元素氯漂白(ECF漂白技术)。加上这一纸种,Lecta纸业的Coral Book系列将有Coral Book White纯白、Coral Book Ivory象牙白、Coral Book Ivory1.5和Coral Book Ivory1.65产品。展开更多
基金This study is supported by the Key Research and Development Plan of Zhejiang Province,China(Grant number:2020C03012).
文摘Monitoring the ecology and physiology of corals,sediments,planktons,and microplastic at a suitable spatial resolution is of great importance in oceanic scientific research.To meet this requirement,an underwater microscope with an electrically controlled variable lens was designed and tested.The captured microscopic images of corals,sediments,planktons,and microplastic revealed their physical,biological,and morphological characteristics.Further studies of the images also revealed the growth,degradation,and bleaching patterns of corals;the presence of plankton communities;and the types of microplastics.The imaging performance is majorly influenced by the choice of lenses,camera selection,and lighting method.Image dehazing,global saturation masks,and image histograms were used to extract the image features.Fundamental experimental proof was obtained with micro-scale images of corals,sediments,planktons,and microplastic at different magnifications.The designed underwater microscope can provide relevant new insights into the observation and detection of the future conditions of aquatic ecosystems.
基金financially supported by Independent Research Subject from Ministry of Science and Technology of China(No.2008BWZ005)
文摘Coral reef-like Ni/Al2O3 catalysts were prepared by co-precipitation of nickel acetate and aluminium nitrate with sodium carbonate aqueous solution in the medium of ethylene glycolye.Methanation of syngas was carried out over coral reef-like Ni/Al2O3 catalysts in a continuous flow type fixed-bed reactor.The structure and properties of the fresh and used catalysts were studied by SEM,N2 adsorption-desorption,XRD,H2-TPR,O2-TPO,TG and ICP-AES techniques.The results showed that the coral reef-like Ni/Al2O3 catalysts exhibited better activity than the conventional Ni/Al2O3-H2O catalysts.The activities of coral reef-like catalysts were in the order of Ni/Al2O3-673Ni/Al2O3-573Ni/Al2O3- 473Ni/Al2O3-773.Ni/Al2O3-673-EG catalyst showed not only good activity and improved stability but also superior resistance to carbon deposition,sintering,and Ni loss.Under the reaction conditions of CO/H2（molar ratio）=1：3,593 K,atmospheric pressure and a GHSV of 2500 h-1,CH4 selectivity was 84.7%,and the CO conversion reached 98.2%.
基金supported by the Key Projects of the National Science Foundation of China(Nos.52178190,52078250,11832013)
文摘On the basis of the three-dimensional(3D)random aggregate&mortar two-phase mesoscale finite element model,C++programming was used to identify the node position information of the interface between the aggregate and mortar elements.The nodes were discretized at this position and the zero-thickness cohesive elements were inserted.After that,the crack energy release rate fracture criterion based on the fracture mechanics theory was assigned to the failure criterion of the interface transition zone(ITZ)elements.Finally,the three-phase mesomechanical model based on the combined finite discrete element method(FDEM)was constructed.Based on this model,the meso-crack extension and macro-mechanical behaviour of coral aggregate concrete(CAC)under uniaxial compression were successfully simulated.The results demonstrated that the meso-mechanical model based on FDEM has excellent applicability to simulate the compressive properties of CAC.
文摘继6月份推出了MetalvacG金属纸之后,西班牙Lecta纸业近日又推出了新型自然白Coral Book Natural 1.2纸种(图1),这种纸是Coral Book系列品种之一,是一种未涂布化学浆纸,主要用于出版印刷行业。Coral Book Natural 1.2纸种主打优良的可印刷性,定量有70g/m2、80g/m2、90g/m2、100g/m2、110g/m2和120g/m2等类型,使用天然可再生原材料生产,纸浆进行了无元素氯漂白(ECF漂白技术)。加上这一纸种,Lecta纸业的Coral Book系列将有Coral Book White纯白、Coral Book Ivory象牙白、Coral Book Ivory1.5和Coral Book Ivory1.65产品。
