The acquisition of digital regional-scale information and ecological environmental data has high requirements for structural texture,spatial res-olution,and multiple parameter categories,which is challenging to achiev...The acquisition of digital regional-scale information and ecological environmental data has high requirements for structural texture,spatial res-olution,and multiple parameter categories,which is challenging to achieve using satellite remote sensing.Considering the convenient,facilitative,and flexible characteristics of UAV(unmanned air vehicle)remote sensing tech-nology,this study selects a campus as a typical research area and uses the Pegasus D2000 equipped with a D-MSPC2000 multi-spectral camera and a CAM3000 aerial camera to acquire oblique images and multi-spectral data.Using professional software,including Context Capture,ENVI,and ArcGIS,a 3D(three-dimensional)campus model,a digital orthophoto map,and multi-spectral remote sensing map drawing are realized,and the geometric accuracy of typical feature selection is evaluated.Based on a quantitative remote sensing model,the campus ecological environment assessment is performed from the perspectives of vegetation and water body.The results presented in this study could be of great significance to the scientific management and sustainable development of regional natural resources.展开更多
Recent years have seen a surge in the use of low-dimensional transition metal dichacolgenides,such as MoS_(2),as catalysts for the electrochemical hydrogen evolution reaction.In particular,sulfur vacancies in MoS_(2)c...Recent years have seen a surge in the use of low-dimensional transition metal dichacolgenides,such as MoS_(2),as catalysts for the electrochemical hydrogen evolution reaction.In particular,sulfur vacancies in MoS_(2)can activate the inert basal plane,but that requires an unrealistically high defect concentration(~9%)to achieve optimal activity.In this work,we demonstrate by firstprinciples calculations that assembling van der Waals heterostructures can enhance the catalytic activity of MoS_(2)with low concentrations of sulfur vacancies.We integrate MoS_(2)with various two-dimensional nanostructures,including graphene,h-BN,phosphorene,transition metal dichacolgenides,MXenes,and their derivatives,aiming to fine-tune the free energy of atomic hydrogen adsorption.Remarkably,an optimal free energy can be achieved for a low sulfur vacancy concentration of~2.5%in the MoS_(2)/MXene-OH heterostructure,as well as high porosity and tunability.These results demonstrate the potential of combining two-dimensional van der Waals assembly with defect engineering for efficient hydrogen production.展开更多
基金supported by the National Natural Science Foundation of China (Grant No.42171311)the Open Fund of State Key Laboratory of Remote Sensing Science (Grant No.OFSLRSS202218)+1 种基金the Key Research and Development Program of the Hainan Province,China (Grant No.ZDYF2021SHFZ105)the Training Program of Excellent Master Thesis of Zhejiang Ocean University.
文摘The acquisition of digital regional-scale information and ecological environmental data has high requirements for structural texture,spatial res-olution,and multiple parameter categories,which is challenging to achieve using satellite remote sensing.Considering the convenient,facilitative,and flexible characteristics of UAV(unmanned air vehicle)remote sensing tech-nology,this study selects a campus as a typical research area and uses the Pegasus D2000 equipped with a D-MSPC2000 multi-spectral camera and a CAM3000 aerial camera to acquire oblique images and multi-spectral data.Using professional software,including Context Capture,ENVI,and ArcGIS,a 3D(three-dimensional)campus model,a digital orthophoto map,and multi-spectral remote sensing map drawing are realized,and the geometric accuracy of typical feature selection is evaluated.Based on a quantitative remote sensing model,the campus ecological environment assessment is performed from the perspectives of vegetation and water body.The results presented in this study could be of great significance to the scientific management and sustainable development of regional natural resources.
基金This work was supported by the National Natural Science Foundation of China(11674042)the Science Challenge Project(TZ2018004)+1 种基金the Fundamental Research Funds for the Central Universities(106112016CDJXY120001)the Thousand Youth Talents Program of China.
文摘Recent years have seen a surge in the use of low-dimensional transition metal dichacolgenides,such as MoS_(2),as catalysts for the electrochemical hydrogen evolution reaction.In particular,sulfur vacancies in MoS_(2)can activate the inert basal plane,but that requires an unrealistically high defect concentration(~9%)to achieve optimal activity.In this work,we demonstrate by firstprinciples calculations that assembling van der Waals heterostructures can enhance the catalytic activity of MoS_(2)with low concentrations of sulfur vacancies.We integrate MoS_(2)with various two-dimensional nanostructures,including graphene,h-BN,phosphorene,transition metal dichacolgenides,MXenes,and their derivatives,aiming to fine-tune the free energy of atomic hydrogen adsorption.Remarkably,an optimal free energy can be achieved for a low sulfur vacancy concentration of~2.5%in the MoS_(2)/MXene-OH heterostructure,as well as high porosity and tunability.These results demonstrate the potential of combining two-dimensional van der Waals assembly with defect engineering for efficient hydrogen production.
