Based on the concentrations of CO2,PM2.5 and PM1.0,and conventional meteorological observation data from 2016 to 2018 at Taiyuan station,which belongs to the Shanxi greenhouse gas observation network,the CO2 concentra...Based on the concentrations of CO2,PM2.5 and PM1.0,and conventional meteorological observation data from 2016 to 2018 at Taiyuan station,which belongs to the Shanxi greenhouse gas observation network,the CO2 concentration monthly and daily distribution characteristics,the weekend effect,and the variation characteristics on haze days and non-haze days,are analyzed.By using the Hybrid Single-Particle Lagrangian Integrated Trajectorymodel(backward trajectory model)and surface wind data,the transmission characteristics of atmospheric CO2 in Taiyuan are studied in various seasons.The results show that,in Taiyuan,the CO2 mole fraction in autumn and winter is higher than that in spring and summer,and on haze days is higher than that on non-haze days.The diurnal variation characteristic of CO2mole fraction in each season is‘single peak and single valley’with the peak value around 0700(hereafter refers to Beijing Time)and the valley value around 1600.The CO2 mole fraction on workdays is slightly higher than that on non-workdays and obviously different around 0800 of the early peak.Horizontal diffusion can reduce the CO2 mole fraction,while breezy weather is not beneficial to CO2 diffusion.The wind direction and speed in the upper levels are different from those near the surface,and the close air masses in the southwest–west–northwest sector raise the CO2 concentration in Taiyuan obviously.This indicates that the CO2 in Taiyuan is mainly contributed by local sources.展开更多
Simulation method is used to provide a guideline f or ultra thin body(UTB) MOSFET designs.Three important parameters of the UTB MOS FE T,i.e.the raised S/D height,Ge mole fraction of the Ge xSi 1-x gate,and the ...Simulation method is used to provide a guideline f or ultra thin body(UTB) MOSFET designs.Three important parameters of the UTB MOS FE T,i.e.the raised S/D height,Ge mole fraction of the Ge xSi 1-x gate,and the silic on body thickness,are comprehensively analyzed and optimized.The optimal region of feasible Ge mole fraction and the silicon body thickness for low operating po wer device are given.As the simulation results show that through changing Ge mole fraction coupl ed with the silicon body thickness tuning,UTB device with good performance can b e obtained.展开更多
Experimental and numerical studies were carried out for the behavior of hydrogen in a three-phase electro- slag furnace using double electrode series technique during electroslag remelting （ESR） process. The effect ...Experimental and numerical studies were carried out for the behavior of hydrogen in a three-phase electro- slag furnace using double electrode series technique during electroslag remelting （ESR） process. The effect of water vapor content of furnace gas on the hydrogen content of ingots was studied through the ＂gas-slag-metal＂ osmosis ex- periment. Based on the experimental results, a mathematical model was set up for the behavior of hydrogen pick-up during ESR process. Then the flow of furnace gas during ESR process was studied through a commercial code FLU- ENT, and the relationship between the water vapor content of furnace gas and argon gas flux in practical production was derived. Finally, the desired reasonable argon gas flow for controlling the hydrogen content of ingots below 2 × 10-6 in practice was obtained.展开更多
基金This paper was supported by the Key Research and Development Project of Shanxi Province[grant number 201803D31220]the General Program of Shanxi Provincial Meteorological Bureau[grant numbers SXKMSDW20205214 and SXKQNDW20205241].
文摘Based on the concentrations of CO2,PM2.5 and PM1.0,and conventional meteorological observation data from 2016 to 2018 at Taiyuan station,which belongs to the Shanxi greenhouse gas observation network,the CO2 concentration monthly and daily distribution characteristics,the weekend effect,and the variation characteristics on haze days and non-haze days,are analyzed.By using the Hybrid Single-Particle Lagrangian Integrated Trajectorymodel(backward trajectory model)and surface wind data,the transmission characteristics of atmospheric CO2 in Taiyuan are studied in various seasons.The results show that,in Taiyuan,the CO2 mole fraction in autumn and winter is higher than that in spring and summer,and on haze days is higher than that on non-haze days.The diurnal variation characteristic of CO2mole fraction in each season is‘single peak and single valley’with the peak value around 0700(hereafter refers to Beijing Time)and the valley value around 1600.The CO2 mole fraction on workdays is slightly higher than that on non-workdays and obviously different around 0800 of the early peak.Horizontal diffusion can reduce the CO2 mole fraction,while breezy weather is not beneficial to CO2 diffusion.The wind direction and speed in the upper levels are different from those near the surface,and the close air masses in the southwest–west–northwest sector raise the CO2 concentration in Taiyuan obviously.This indicates that the CO2 in Taiyuan is mainly contributed by local sources.
文摘Simulation method is used to provide a guideline f or ultra thin body(UTB) MOSFET designs.Three important parameters of the UTB MOS FE T,i.e.the raised S/D height,Ge mole fraction of the Ge xSi 1-x gate,and the silic on body thickness,are comprehensively analyzed and optimized.The optimal region of feasible Ge mole fraction and the silicon body thickness for low operating po wer device are given.As the simulation results show that through changing Ge mole fraction coupl ed with the silicon body thickness tuning,UTB device with good performance can b e obtained.
基金Item Sponsored by National Natural Science Foundation of China(51274057)Key Projects in National Science and Technology Pillar Program of China(2011BAE13B03)National High-Tech Research and Development Program of China(2013AA03092,2012AA03A508)
文摘Experimental and numerical studies were carried out for the behavior of hydrogen in a three-phase electro- slag furnace using double electrode series technique during electroslag remelting （ESR） process. The effect of water vapor content of furnace gas on the hydrogen content of ingots was studied through the ＂gas-slag-metal＂ osmosis ex- periment. Based on the experimental results, a mathematical model was set up for the behavior of hydrogen pick-up during ESR process. Then the flow of furnace gas during ESR process was studied through a commercial code FLU- ENT, and the relationship between the water vapor content of furnace gas and argon gas flux in practical production was derived. Finally, the desired reasonable argon gas flow for controlling the hydrogen content of ingots below 2 × 10-6 in practice was obtained.
