鉴于传统调制传递函数(modulation transfer function,MTF)空间域分析结果受实验目标选择影响很大,应用EROS提出的频率域线状地物法对Landsat-8卫星OLI成像仪MTF进行在轨评测,并通过对比实验验证方法。基于目标和传感器特性分析,分别建...鉴于传统调制传递函数(modulation transfer function,MTF)空间域分析结果受实验目标选择影响很大,应用EROS提出的频率域线状地物法对Landsat-8卫星OLI成像仪MTF进行在轨评测,并通过对比实验验证方法。基于目标和传感器特性分析,分别建立目标模型和系统传递函数模型,利用拟合数据求解模型参数,进而计算得到MTF值。并将EROS方法与传统T choi方法测得的MTF值进行对比。实验结果表明,EROS方法能有效应用于Landsat-8卫星OLI成像仪的MTF在轨测量,且明显减少了目标选择对于MTF评测结果的影响。展开更多
M0 S2 is a promising candidate for hydrogen evolution reaction(HER),while its active sites are mainly distributed on the edge sites rather than the basal plane sites.Herein,a strategy to overcome the inertness of the ...M0 S2 is a promising candidate for hydrogen evolution reaction(HER),while its active sites are mainly distributed on the edge sites rather than the basal plane sites.Herein,a strategy to overcome the inertness of the M0 S2 basal surface and achieve high HER activity by combining single-boron catalyst and compressive strain was reported through density functional theory(DFT)computations.The ab initio molecular dynamics(AIMD)simulation on B@MoS2 suggests high thermodynamic and kinetic stability.We found that the rather strong adsorption of hydrogen by B@MoS2 can be alleviated by stress engineering.The optimal stress of -7%can achieve a nearly zero value of △Gh(〜-0.084 eV),which is close to that of the ideal Pt-SACs for HER.The novel HER activity is attributed to(i)the Bdoping brings the active site to the basal plane of M0 S2 and reduces the band-gap,thereby increasing the conductivity;(ii)the compressive stress regulates the number of charge transfer between(H)-(B)-(MoS2),weakening the adsorption energy of hydrogen on B@MoS2.Moreover,we constructed a SiN/B@MoS2 heterojunction,which introduces an 8.6%compressive stress for B@MoS2 and yields an ideal AGh-This work provides an effective means to achieve high intrinsic HER activity for M0 S2.展开更多
文摘鉴于传统调制传递函数(modulation transfer function,MTF)空间域分析结果受实验目标选择影响很大,应用EROS提出的频率域线状地物法对Landsat-8卫星OLI成像仪MTF进行在轨评测,并通过对比实验验证方法。基于目标和传感器特性分析,分别建立目标模型和系统传递函数模型,利用拟合数据求解模型参数,进而计算得到MTF值。并将EROS方法与传统T choi方法测得的MTF值进行对比。实验结果表明,EROS方法能有效应用于Landsat-8卫星OLI成像仪的MTF在轨测量,且明显减少了目标选择对于MTF评测结果的影响。
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.21771182 and 21501177)the Open Project Program of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences.The authors also gratefully acknowledge the Supercomputing Center in Yantai university for providing the computing resources.
文摘M0 S2 is a promising candidate for hydrogen evolution reaction(HER),while its active sites are mainly distributed on the edge sites rather than the basal plane sites.Herein,a strategy to overcome the inertness of the M0 S2 basal surface and achieve high HER activity by combining single-boron catalyst and compressive strain was reported through density functional theory(DFT)computations.The ab initio molecular dynamics(AIMD)simulation on B@MoS2 suggests high thermodynamic and kinetic stability.We found that the rather strong adsorption of hydrogen by B@MoS2 can be alleviated by stress engineering.The optimal stress of -7%can achieve a nearly zero value of △Gh(〜-0.084 eV),which is close to that of the ideal Pt-SACs for HER.The novel HER activity is attributed to(i)the Bdoping brings the active site to the basal plane of M0 S2 and reduces the band-gap,thereby increasing the conductivity;(ii)the compressive stress regulates the number of charge transfer between(H)-(B)-(MoS2),weakening the adsorption energy of hydrogen on B@MoS2.Moreover,we constructed a SiN/B@MoS2 heterojunction,which introduces an 8.6%compressive stress for B@MoS2 and yields an ideal AGh-This work provides an effective means to achieve high intrinsic HER activity for M0 S2.
