溶剂热的条件下合成的金属有机框架[Cd(ABTC)(H2O)2(DMA)]·4DMA(JLNU-4,JLNU=Jilin Normal University)具有三维孔道结构,对该化合物的碘吸附性能研究发现其吸附效率可以达到92.9%,且吸附和释放后,晶型并未发生改变,具有较高稳定性...溶剂热的条件下合成的金属有机框架[Cd(ABTC)(H2O)2(DMA)]·4DMA(JLNU-4,JLNU=Jilin Normal University)具有三维孔道结构,对该化合物的碘吸附性能研究发现其吸附效率可以达到92.9%,且吸附和释放后,晶型并未发生改变,具有较高稳定性,可以作为一种方便、经济以及环境友好型材料开发其在I2吸附领域的应用。展开更多
针对Sentinel-2卫星影像拥有3个对植被生长状况非常敏感、空间分辨率为20 m的红边波段(705、740、783 nm),其空间分辨率与可见光和近红外波段10 m的空间分辨率不一致,使Sentinel-2影像应用受到限制的问题,基于多光谱多分辨率估计的超分...针对Sentinel-2卫星影像拥有3个对植被生长状况非常敏感、空间分辨率为20 m的红边波段(705、740、783 nm),其空间分辨率与可见光和近红外波段10 m的空间分辨率不一致,使Sentinel-2影像应用受到限制的问题,基于多光谱多分辨率估计的超分辨率(Super-resolution for multispectral multiresoltion estimation,Sup Re Me)算法将空间分辨率20 m的6个波段重建为10 m;以重建后的影像为数据源,耦合PROSAIL辐射传输模型和随机森林模型反演玉米冠层叶面积指数(LAI),并以野外实测LAI验证其反演精度。结果表明,采用Sup Re Me算法对Sentinel-2影像进行重建后,在保持光谱特性不变的同时提高了影像的空间细节;基于重建影像和原始影像的LAI反演决定系数R2分别为0.70、0.68,均方根误差RSME分别为0.240、0.262。研究表明,利用Sup Re Me算法重建后的Sentinel-2卫星影像,能够在提高玉米冠层LAI反演空间分辨率的同时提高反演精度,在挖掘高分辨率农作物生长信息方面具有很大潜力。展开更多
人教版(Go for it!)初中英语教材Section A 2d的教学一直是初中英语听说课教学中的难点。由于教师教材分析意识、文本解读意识和策略渗透意识的缺失,目前的2d教学存在很多问题。以2d的深度开发和应用为例,提出“感知—理解—提炼—替换...人教版(Go for it!)初中英语教材Section A 2d的教学一直是初中英语听说课教学中的难点。由于教师教材分析意识、文本解读意识和策略渗透意识的缺失,目前的2d教学存在很多问题。以2d的深度开发和应用为例,提出“感知—理解—提炼—替换—提升”教学模式,旨在提高学生的口头表达能力。展开更多
A set of CH2-,NH-,and O-substituted 2,1,3-benzothiadiazole(BTD)-based derivatives have been investigated theoretically in order to explore their electronic,optical,and charge transport properties.The calculation resul...A set of CH2-,NH-,and O-substituted 2,1,3-benzothiadiazole(BTD)-based derivatives have been investigated theoretically in order to explore their electronic,optical,and charge transport properties.The calculation results show that the electronic and optical properties of the pristine molecule can be easily tuned through changing the S substituent in the central aromatic ring.Based on the calculated maximum emission wavelength,we predict that CH2-,NH-,and O-substituted BTD-based derivatives could be used as red,green,and orange light-emitting materials,respectively.After CH2-,NH-or O-substitution,the oscillator strengths of the emission spectra are enhanced with respect to that of the pristine molecule,implying that these compounds have larger fluorescence intensity.Finally,it can be deduced that CH2-,NH-,and O-substituted BTD-based derivatives may act as hole transport materials in organic light-emitting diodes.展开更多
文摘溶剂热的条件下合成的金属有机框架[Cd(ABTC)(H2O)2(DMA)]·4DMA(JLNU-4,JLNU=Jilin Normal University)具有三维孔道结构,对该化合物的碘吸附性能研究发现其吸附效率可以达到92.9%,且吸附和释放后,晶型并未发生改变,具有较高稳定性,可以作为一种方便、经济以及环境友好型材料开发其在I2吸附领域的应用。
文摘针对Sentinel-2卫星影像拥有3个对植被生长状况非常敏感、空间分辨率为20 m的红边波段(705、740、783 nm),其空间分辨率与可见光和近红外波段10 m的空间分辨率不一致,使Sentinel-2影像应用受到限制的问题,基于多光谱多分辨率估计的超分辨率(Super-resolution for multispectral multiresoltion estimation,Sup Re Me)算法将空间分辨率20 m的6个波段重建为10 m;以重建后的影像为数据源,耦合PROSAIL辐射传输模型和随机森林模型反演玉米冠层叶面积指数(LAI),并以野外实测LAI验证其反演精度。结果表明,采用Sup Re Me算法对Sentinel-2影像进行重建后,在保持光谱特性不变的同时提高了影像的空间细节;基于重建影像和原始影像的LAI反演决定系数R2分别为0.70、0.68,均方根误差RSME分别为0.240、0.262。研究表明,利用Sup Re Me算法重建后的Sentinel-2卫星影像,能够在提高玉米冠层LAI反演空间分辨率的同时提高反演精度,在挖掘高分辨率农作物生长信息方面具有很大潜力。
基金support from the Education Office of Jilin Province (2010142)the Institute Foundation of Siping City (2010009)supports from State Key Laboratory of Theoretical and Computational Chemistry of Jilin University
文摘A set of CH2-,NH-,and O-substituted 2,1,3-benzothiadiazole(BTD)-based derivatives have been investigated theoretically in order to explore their electronic,optical,and charge transport properties.The calculation results show that the electronic and optical properties of the pristine molecule can be easily tuned through changing the S substituent in the central aromatic ring.Based on the calculated maximum emission wavelength,we predict that CH2-,NH-,and O-substituted BTD-based derivatives could be used as red,green,and orange light-emitting materials,respectively.After CH2-,NH-or O-substitution,the oscillator strengths of the emission spectra are enhanced with respect to that of the pristine molecule,implying that these compounds have larger fluorescence intensity.Finally,it can be deduced that CH2-,NH-,and O-substituted BTD-based derivatives may act as hole transport materials in organic light-emitting diodes.
