设计并完成了一个B/S结构的天气影响的城市交通实验平台。首先对出租车定位数据进行预处理,包括统计上下客坐标、上下客时间等。然后将数据映射到公开地图Open Street Map中进行可视化展示,确定了机场区域和地铁口区域,设计了机场车流...设计并完成了一个B/S结构的天气影响的城市交通实验平台。首先对出租车定位数据进行预处理,包括统计上下客坐标、上下客时间等。然后将数据映射到公开地图Open Street Map中进行可视化展示,确定了机场区域和地铁口区域,设计了机场车流量分析和地铁口车流量分析模块,筛选指定区域内的出租车出行数据。在此实验平台上,利用ASP.NET、Java Script等技术实现分析与统计结果以图表展示。展开更多
Quaternary chalcogenide Cu2FeSnS4 （CFTS） nanoparticles, as a kind of potential absorber layer material in thin film solar cells （TFSCs）, were successfully synthesized by using a convenient solvothermal method. Alk...Quaternary chalcogenide Cu2FeSnS4 （CFTS） nanoparticles, as a kind of potential absorber layer material in thin film solar cells （TFSCs）, were successfully synthesized by using a convenient solvothermal method. Alkali element K is incorporated into CFTS thin films in order to fiLrther improve the surface morphology and the optical properties of related films. X-ray diffraction （XRD）, Raman spectroscopy and field emission scanning electron microscopy （FESEM） were used to characterize the phase purity, morphology and composition of CFTS particles and thin films. The results show that the particle elemental ratios of Cu/（Fe＋Sn） and Fe/Sn are 1.2 and 0.9, respectively, which are close to the characteristics of stoichiometric CFTS. The band gaps of CFTS films before and after doping K ions are estimated to be 1.44 eV and 1.4 eV with an error of ±0.02 eV.展开更多
Cu_2NiSnS_4 nanoparticles were prepared for the first time using a facile solid-phase process at a temperature of 180 °C. The crystalline structure, morphology and optical properties of the Cu_2NiSnS_4 nanopartic...Cu_2NiSnS_4 nanoparticles were prepared for the first time using a facile solid-phase process at a temperature of 180 °C. The crystalline structure, morphology and optical properties of the Cu_2NiSnS_4 nanoparticles were characterized by means of X-ray diffraction(XRD), field emission scanning electron microscopy(FESEM), transmission electron microscope(TEM) and ultraviolet-visible(UV-vis) spectrophotometer. The band gap and conversion efficiency of Cu_2NiSnS_4 nanoparticles were studied at various temperature. The results showed that the Cu_2NiSnS_4 nanoparticles exhibited an optimum band gap of 1.58 e V and a conversion efficiency of 0.64% at 180 °C, indicating that it maybe be useful in low-cost thin film solar cells.展开更多
文摘设计并完成了一个B/S结构的天气影响的城市交通实验平台。首先对出租车定位数据进行预处理,包括统计上下客坐标、上下客时间等。然后将数据映射到公开地图Open Street Map中进行可视化展示,确定了机场区域和地铁口区域,设计了机场车流量分析和地铁口车流量分析模块,筛选指定区域内的出租车出行数据。在此实验平台上,利用ASP.NET、Java Script等技术实现分析与统计结果以图表展示。
基金supported by National Natural Science Foundation of China(No.51674026)the Fundamental Research Funds for the Central Universities in 2015(No.FRF-BD-15-004A)
文摘Quaternary chalcogenide Cu2FeSnS4 （CFTS） nanoparticles, as a kind of potential absorber layer material in thin film solar cells （TFSCs）, were successfully synthesized by using a convenient solvothermal method. Alkali element K is incorporated into CFTS thin films in order to fiLrther improve the surface morphology and the optical properties of related films. X-ray diffraction （XRD）, Raman spectroscopy and field emission scanning electron microscopy （FESEM） were used to characterize the phase purity, morphology and composition of CFTS particles and thin films. The results show that the particle elemental ratios of Cu/（Fe＋Sn） and Fe/Sn are 1.2 and 0.9, respectively, which are close to the characteristics of stoichiometric CFTS. The band gaps of CFTS films before and after doping K ions are estimated to be 1.44 eV and 1.4 eV with an error of ±0.02 eV.
基金supported by the Fundamental Research Funds for the Central Public Welfare Research Institutes (No.TKS20200311)。
文摘Cu_2NiSnS_4 nanoparticles were prepared for the first time using a facile solid-phase process at a temperature of 180 °C. The crystalline structure, morphology and optical properties of the Cu_2NiSnS_4 nanoparticles were characterized by means of X-ray diffraction(XRD), field emission scanning electron microscopy(FESEM), transmission electron microscope(TEM) and ultraviolet-visible(UV-vis) spectrophotometer. The band gap and conversion efficiency of Cu_2NiSnS_4 nanoparticles were studied at various temperature. The results showed that the Cu_2NiSnS_4 nanoparticles exhibited an optimum band gap of 1.58 e V and a conversion efficiency of 0.64% at 180 °C, indicating that it maybe be useful in low-cost thin film solar cells.
