Conversion efficiency of soft X-ray from 0.35μm pulse laser-irradiated aluminium planar target at laser intensities 10^13- 10^15 W/cm^2 on the Xingguang-Ⅱ facility （laser energy 5 - 90 J, focal spot - Φ 200μm ful...Conversion efficiency of soft X-ray from 0.35μm pulse laser-irradiated aluminium planar target at laser intensities 10^13- 10^15 W/cm^2 on the Xingguang-Ⅱ facility （laser energy 5 - 90 J, focal spot - Φ 200μm full width of half maximun （FWHM） 400 - 800 ps） was measured. A simple model was given to explain soft X-ray conversion efficiency. In this model, because of the heat conduction from the laser-heated spot, the conversion was very small at lower irradiance limit, while at higher limit it was bounded by the energy lost in blow off plasma. Consequently, at the laser intensity around 2×10^14 W/cm^2 , the X-ray conversion efficiency reaches a maximum.展开更多
We report on fabrication and photovoltaic characteristics of InxGa1-xN/GaN multiple quantum well solar cells with different indium compositions and barrier thicknesses. The as-grown samples are characterized by high- ...We report on fabrication and photovoltaic characteristics of InxGa1-xN/GaN multiple quantum well solar cells with different indium compositions and barrier thicknesses. The as-grown samples are characterized by high- resolution x-ray diffraction and reciprocal space mapping. The results show that the sample with a thick barrier thickness （lO.Onm） and high indium composition （0.23） has better crystalline quality. In addition, the dark current density-voltage （J-V） measurement of this device shows a significant decrease of leakage current, which leads to high open-circuit voltage Vow. Through the J-V characteristics under an Air Mass 1.5 Global （AM 1.5 G） illumination, this device exhibits a Voc of 1.89 V, a short-circuit current density Ysc of 3.92mA/cm2 and a fill factor of 50.96%. As a result, the conversion efficiency （77） is enhanced to be 3.77% in comparison with other devices.展开更多
为研究不同海拔下SCR系统性能,分别在80、90、100 k Pa大气压力下对一台满足国五排放标准的高压共轨柴油机进行性能与排放试验,以研究排气温度、排气流量和海拔变化对NO_(x)转化率和NH_(3)泄漏量的影响。结果表明:在排气流量为350 kg/h...为研究不同海拔下SCR系统性能,分别在80、90、100 k Pa大气压力下对一台满足国五排放标准的高压共轨柴油机进行性能与排放试验,以研究排气温度、排气流量和海拔变化对NO_(x)转化率和NH_(3)泄漏量的影响。结果表明:在排气流量为350 kg/h情况下,NO_(x)转化率随排气温度升高呈现先增后减的趋势,不同温度下NO_(x)转化率最大差值为43.4百分点;NH_(3)泄漏量随着温度的升高大体上呈下降趋势,不同温度下NH_(3)泄漏量最大差值为328×10^(-6);NO_(x)转化率随排气流量升高呈现先增后减的趋势,在250℃时,不同排气流量下NO_(x)转化效率最大相差21.5百分点;NH_(3)泄漏量随排气流量的增大而增加,在250℃时,不同排气流量下NH_(3)泄漏量最大差值为90.8×10^(-6)。相同工况下,海拔越高,NO_(x)转化率越高,NH_(3)泄漏量越小,大气压力为80和100 k Pa下NO_(x)转化率最大相差20.1百分点,NH_(3)泄漏量最大相差54.6×10^(-6)。展开更多
The presented work reports the selective catalytic reduction(SCR)of NO_(x) assisted by dielectric barrier discharge plasma via simulating marine diesel engine exhaust,and the experimental results demonstrate that the ...The presented work reports the selective catalytic reduction(SCR)of NO_(x) assisted by dielectric barrier discharge plasma via simulating marine diesel engine exhaust,and the experimental results demonstrate that the low-temperature activity of NH_(3)-SCR assisted by non-thermal plasma is enhanced significantly,particularly in the presence of a C_(3)H_(6) additive.Simultaneously,CeMnZrO_(x)@TiO_(2) exhibits strong tolerance to SO_(2) poisoning and superior catalytic stability.It is worthwhile to explore a new approach to remove NO_(x) from marine diesel engine exhaust,which is of vital significance for both academic research and practical applications.展开更多
基金Project suppoted by Shanghai Leading Academic Discipline Foundation （Grant No. T0104）, and Science Foundation of Shanghai Mtmicipal Commission of Education （Grant No. 214680）
文摘Conversion efficiency of soft X-ray from 0.35μm pulse laser-irradiated aluminium planar target at laser intensities 10^13- 10^15 W/cm^2 on the Xingguang-Ⅱ facility （laser energy 5 - 90 J, focal spot - Φ 200μm full width of half maximun （FWHM） 400 - 800 ps） was measured. A simple model was given to explain soft X-ray conversion efficiency. In this model, because of the heat conduction from the laser-heated spot, the conversion was very small at lower irradiance limit, while at higher limit it was bounded by the energy lost in blow off plasma. Consequently, at the laser intensity around 2×10^14 W/cm^2 , the X-ray conversion efficiency reaches a maximum.
基金Supported by the National Basic Research Program of China(No 2012CB619303)the National High-Technology Research and Development Program of China(No 2011AA050514)
文摘We report on fabrication and photovoltaic characteristics of InxGa1-xN/GaN multiple quantum well solar cells with different indium compositions and barrier thicknesses. The as-grown samples are characterized by high- resolution x-ray diffraction and reciprocal space mapping. The results show that the sample with a thick barrier thickness （lO.Onm） and high indium composition （0.23） has better crystalline quality. In addition, the dark current density-voltage （J-V） measurement of this device shows a significant decrease of leakage current, which leads to high open-circuit voltage Vow. Through the J-V characteristics under an Air Mass 1.5 Global （AM 1.5 G） illumination, this device exhibits a Voc of 1.89 V, a short-circuit current density Ysc of 3.92mA/cm2 and a fill factor of 50.96%. As a result, the conversion efficiency （77） is enhanced to be 3.77% in comparison with other devices.
文摘为研究不同海拔下SCR系统性能,分别在80、90、100 k Pa大气压力下对一台满足国五排放标准的高压共轨柴油机进行性能与排放试验,以研究排气温度、排气流量和海拔变化对NO_(x)转化率和NH_(3)泄漏量的影响。结果表明:在排气流量为350 kg/h情况下,NO_(x)转化率随排气温度升高呈现先增后减的趋势,不同温度下NO_(x)转化率最大差值为43.4百分点;NH_(3)泄漏量随着温度的升高大体上呈下降趋势,不同温度下NH_(3)泄漏量最大差值为328×10^(-6);NO_(x)转化率随排气流量升高呈现先增后减的趋势,在250℃时,不同排气流量下NO_(x)转化效率最大相差21.5百分点;NH_(3)泄漏量随排气流量的增大而增加,在250℃时,不同排气流量下NH_(3)泄漏量最大差值为90.8×10^(-6)。相同工况下,海拔越高,NO_(x)转化率越高,NH_(3)泄漏量越小,大气压力为80和100 k Pa下NO_(x)转化率最大相差20.1百分点,NH_(3)泄漏量最大相差54.6×10^(-6)。
基金supported by National Key Research and Development Project of China(No.2019YFC1805503)National Engineering Laboratory for Mobile Source Emission Control Technology(No.NELMS2019A13)+1 种基金the Open Project Program of the State Key Laboratory of Petroleum Pollution Control(No.PPC2019013)Major Science and Technology Projects of Shanxi Province(No.20181102017)。
文摘The presented work reports the selective catalytic reduction(SCR)of NO_(x) assisted by dielectric barrier discharge plasma via simulating marine diesel engine exhaust,and the experimental results demonstrate that the low-temperature activity of NH_(3)-SCR assisted by non-thermal plasma is enhanced significantly,particularly in the presence of a C_(3)H_(6) additive.Simultaneously,CeMnZrO_(x)@TiO_(2) exhibits strong tolerance to SO_(2) poisoning and superior catalytic stability.It is worthwhile to explore a new approach to remove NO_(x) from marine diesel engine exhaust,which is of vital significance for both academic research and practical applications.
