Impurity seeding has been found effective for divertor detachment operations and the seeding location plays a key role in this process.In this work,we use the fluid code SOLPS-ITER to study the influence of seeding lo...Impurity seeding has been found effective for divertor detachment operations and the seeding location plays a key role in this process.In this work,we use the fluid code SOLPS-ITER to study the influence of seeding locations on divertor and scrape-off layer(D-SOL)plasmas in Experimental Advanced Superconducting Tokamak(EAST)with neon seeding.Simulation results indicate that the neon is a highly effective impurity in mitigating the heat flux and electron temperature peaks on the target of the divertor and achieving the partial detachment on both inner and outer targets.Further,by comparing results of the seeding at the private-flux region(PFR)plate(called‘TP’location)and the outer target(called‘XP’location),we find that the impurity density and power radiation for TP case are higher in core and upstream regions and lower in the divertor region than that for seeding at the XP,and the difference becomes more and more obvious as the seeding rate increases.It clearly demonstrates that the seeding at the XP location is more appropriate than at the TP location,especially in high seeding rate conditions.展开更多
以固相法制备出了磷酸亚铁锂-磷酸钒锂复合正极材料。采用X-射线衍射仪(XRD)、电子扫面电镜(SEM)、激光粒度分析仪、碳硫分析仪以及X-光电子能谱仪等对制备出的复合材料进行表征,发现该材料以磷酸亚铁锂和磷酸钒锂的晶形结构为主,其中...以固相法制备出了磷酸亚铁锂-磷酸钒锂复合正极材料。采用X-射线衍射仪(XRD)、电子扫面电镜(SEM)、激光粒度分析仪、碳硫分析仪以及X-光电子能谱仪等对制备出的复合材料进行表征,发现该材料以磷酸亚铁锂和磷酸钒锂的晶形结构为主,其中有少量的杂质成分;该材料颗粒粒度较细、粒度分布窄且均匀,颗粒表面光滑、碳包裹状况良好,同其它方法制备的复合材料比较在碳含量差不多的情况下具有较优的导电率。对材料进行了电化学性能表征认为该材料的电化学性能比较优异,0.1 C放电容量达到190 mA h g 1以上,10 C可以达到120 mA h g 1,20 C放电容量仍有85 mA h g 1且循环稳定性均较好;1 C进行1000次循环之后仍然保持120 mA h g 1的容量,具有较高的实用价值。展开更多
Powders of strontium hexaferrite (SrFe12O19 - SrF) have been prepared by the sol-gel process. The prepared precursor was calcined in two different calcination techniques, using conventional furnace and microwave furna...Powders of strontium hexaferrite (SrFe12O19 - SrF) have been prepared by the sol-gel process. The prepared precursor was calcined in two different calcination techniques, using conventional furnace and microwave furnace. Thermal analysis studies showed exothermic and endothermic reaction peak at room temperature to 1200°C. An investigation of SrFe12O19 crystalline powder from the structural and magnetic aspect is performed using X-ray diffraction (XRD), High resolution scanning electron microscopy (HR-SEM) and vibrating sample magnetometer (VSM). The average particle diagonal size of SrFe12O19 powder was 80 - 100 nm in conventional and 40 - 70 nm in microwave calcinations respectively. XRD result showed the formation of SrFe12O19 of the sample calcined at 900oC with Fe/Sr: D-Fructose ratio = 12.展开更多
基金supported by the National Key Research and Development Program(No.2018YFE0303105)National MCF Energy R&D Program(No.2019YFE03080300)National Natural Science Foundation of China(No.11975087)。
文摘Impurity seeding has been found effective for divertor detachment operations and the seeding location plays a key role in this process.In this work,we use the fluid code SOLPS-ITER to study the influence of seeding locations on divertor and scrape-off layer(D-SOL)plasmas in Experimental Advanced Superconducting Tokamak(EAST)with neon seeding.Simulation results indicate that the neon is a highly effective impurity in mitigating the heat flux and electron temperature peaks on the target of the divertor and achieving the partial detachment on both inner and outer targets.Further,by comparing results of the seeding at the private-flux region(PFR)plate(called‘TP’location)and the outer target(called‘XP’location),we find that the impurity density and power radiation for TP case are higher in core and upstream regions and lower in the divertor region than that for seeding at the XP,and the difference becomes more and more obvious as the seeding rate increases.It clearly demonstrates that the seeding at the XP location is more appropriate than at the TP location,especially in high seeding rate conditions.
文摘以固相法制备出了磷酸亚铁锂-磷酸钒锂复合正极材料。采用X-射线衍射仪(XRD)、电子扫面电镜(SEM)、激光粒度分析仪、碳硫分析仪以及X-光电子能谱仪等对制备出的复合材料进行表征,发现该材料以磷酸亚铁锂和磷酸钒锂的晶形结构为主,其中有少量的杂质成分;该材料颗粒粒度较细、粒度分布窄且均匀,颗粒表面光滑、碳包裹状况良好,同其它方法制备的复合材料比较在碳含量差不多的情况下具有较优的导电率。对材料进行了电化学性能表征认为该材料的电化学性能比较优异,0.1 C放电容量达到190 mA h g 1以上,10 C可以达到120 mA h g 1,20 C放电容量仍有85 mA h g 1且循环稳定性均较好;1 C进行1000次循环之后仍然保持120 mA h g 1的容量,具有较高的实用价值。
文摘Powders of strontium hexaferrite (SrFe12O19 - SrF) have been prepared by the sol-gel process. The prepared precursor was calcined in two different calcination techniques, using conventional furnace and microwave furnace. Thermal analysis studies showed exothermic and endothermic reaction peak at room temperature to 1200°C. An investigation of SrFe12O19 crystalline powder from the structural and magnetic aspect is performed using X-ray diffraction (XRD), High resolution scanning electron microscopy (HR-SEM) and vibrating sample magnetometer (VSM). The average particle diagonal size of SrFe12O19 powder was 80 - 100 nm in conventional and 40 - 70 nm in microwave calcinations respectively. XRD result showed the formation of SrFe12O19 of the sample calcined at 900oC with Fe/Sr: D-Fructose ratio = 12.
