Single and dual layers of InGaN quantum dots(QDs)are grown by metal organic chemical vapor deposition.In the former,the density,average height and diameter of QDs are 1.3×10^(9) cm^(−2),0.93 nm and 65.1 nm,respec...Single and dual layers of InGaN quantum dots(QDs)are grown by metal organic chemical vapor deposition.In the former,the density,average height and diameter of QDs are 1.3×10^(9) cm^(−2),0.93 nm and 65.1 nm,respectively.The latter is grown under the same conditions and possesses a 20 nm low-temperature grown GaN barrier between two layers.The density,average height and diameter of QDs in the upper layer are 2.6×10^(10) cm^(−2),4.6 nm and 81.3 nm,respectively.Two reasons are proposed to explain the QD density increase in the upper layer.First,the strain accumulation in the upper layer is higher,leading to a stronger three-dimensional growth.Second,the GaN barrier beneath the upper layer is so rough it induces growth QDs.展开更多
Geothermal with features of large reserves and non-pollution has been one of the most important energy. China has significant geothermal resources. There are rich hydrothermal resources in Xinji, which has been in dev...Geothermal with features of large reserves and non-pollution has been one of the most important energy. China has significant geothermal resources. There are rich hydrothermal resources in Xinji, which has been in development for 5 years. However, hot water continues to decrease because of extensive exploitation and utilization. We selected exploration area as study area, build a set of numerical models of Guantao formation on the basis of actual geological conditions. We get the distribution of hydraulic conductivity from 1.7 m/d to 1.9 m/d by parameter inversion using historical water level monitoring data, and simulation effect is good. We calculate the maximum permissible exploitation under the limitation of 200 m in depth in 50 years which is about 2.2 million m3/a. The results will provide theoretic support for plan making of geothermal exploitation.展开更多
基金Supported by the National Basic Research Program of China under Grant Nos 2011CB301902,and 2011CB301903the National High-Technology Research and Development Program of China under Grant Nos 2011AA03A112,2011AA03A106 and 2011AA03A105+1 种基金the National Natural Science Foundation of China under Grant Nos 60723002,50706022,60977022 and 51002085Beijing Natural Science Foundation under Grant No 4091001.
文摘Single and dual layers of InGaN quantum dots(QDs)are grown by metal organic chemical vapor deposition.In the former,the density,average height and diameter of QDs are 1.3×10^(9) cm^(−2),0.93 nm and 65.1 nm,respectively.The latter is grown under the same conditions and possesses a 20 nm low-temperature grown GaN barrier between two layers.The density,average height and diameter of QDs in the upper layer are 2.6×10^(10) cm^(−2),4.6 nm and 81.3 nm,respectively.Two reasons are proposed to explain the QD density increase in the upper layer.First,the strain accumulation in the upper layer is higher,leading to a stronger three-dimensional growth.Second,the GaN barrier beneath the upper layer is so rough it induces growth QDs.
基金supported by thermal response test(TRT)and numerical modeling with vertical ground heat exchanger in media sand(41302189)the research on the behavior characteristic of As and REE in high temperature geothermal fluid(1415042249)geothermal survey of Xiamen-Qiongbei region in Southeast coastal(12120115045901)
文摘Geothermal with features of large reserves and non-pollution has been one of the most important energy. China has significant geothermal resources. There are rich hydrothermal resources in Xinji, which has been in development for 5 years. However, hot water continues to decrease because of extensive exploitation and utilization. We selected exploration area as study area, build a set of numerical models of Guantao formation on the basis of actual geological conditions. We get the distribution of hydraulic conductivity from 1.7 m/d to 1.9 m/d by parameter inversion using historical water level monitoring data, and simulation effect is good. We calculate the maximum permissible exploitation under the limitation of 200 m in depth in 50 years which is about 2.2 million m3/a. The results will provide theoretic support for plan making of geothermal exploitation.
