针对西南高原地区的地形起伏、地貌复杂等因素对建立基于CGCS 2000的高原地区地方坐标系的影响,采用ALOS World 3D-30m DSM数据来获取区域的地形地貌情况,用以计算、分析每千米边长高程归化改正值。以西南高原地区滇西北某市为例,详细...针对西南高原地区的地形起伏、地貌复杂等因素对建立基于CGCS 2000的高原地区地方坐标系的影响,采用ALOS World 3D-30m DSM数据来获取区域的地形地貌情况,用以计算、分析每千米边长高程归化改正值。以西南高原地区滇西北某市为例,详细阐述了高原地区地方坐标系的最佳中央子午线和抵偿高程面的选取与地方椭球的建立,通过重点精化区域的控制点予以实现高原地区地方坐标系的建立并对其精度进行分析、验证。展开更多
Enhancement in boiling heat transfer performance is significant for addressing thermal management bottlenecks of advanced electronic systems.Reduced graphene oxides(rGO)are regarded as promising candidates for thermal...Enhancement in boiling heat transfer performance is significant for addressing thermal management bottlenecks of advanced electronic systems.Reduced graphene oxides(rGO)are regarded as promising candidates for thermal management due to their excellent thermal properties,chemical stability and adjustable wettability.In this study,rGO coatings with micron pores and controllable oxygen contents are prepared on Al substrate via cathodic electrophoretic deposition and subsequent thermal annealing,leading to enhanced pool boiling performance.The heat transfer coefficient for Al/rGO450is 37.2 kW m-2K-1,which is increased by 112.6%compared with bare Al,also outperformed previously reported Al based substrates.It is assumed that the hydrophilic and aerophobic r GO coatings effectively promote the liquid infiltration and bubble departure during pool boiling process.Importantly,repeatability tests indicate the durable stability of vertically oriented rGO nanosheets.Reverse nonequilibrium molecular dynamics simulation indicates that the interfacial transmission coefficients of Al/rGO increase after thermal annealing,indicative of the enhanced heat transfer performance of heterogeneous interface.Our study opens a new avenue for endowing metal substrates with high pool boiling performance using porous carbon coating nanoengineering strategy with controllable morphology and components.展开更多
文摘针对西南高原地区的地形起伏、地貌复杂等因素对建立基于CGCS 2000的高原地区地方坐标系的影响,采用ALOS World 3D-30m DSM数据来获取区域的地形地貌情况,用以计算、分析每千米边长高程归化改正值。以西南高原地区滇西北某市为例,详细阐述了高原地区地方坐标系的最佳中央子午线和抵偿高程面的选取与地方椭球的建立,通过重点精化区域的控制点予以实现高原地区地方坐标系的建立并对其精度进行分析、验证。
基金supported by the National Natural Science Foundation of China(Grant No.51635005)the 111 Project(Grant No.B18017)。
文摘Enhancement in boiling heat transfer performance is significant for addressing thermal management bottlenecks of advanced electronic systems.Reduced graphene oxides(rGO)are regarded as promising candidates for thermal management due to their excellent thermal properties,chemical stability and adjustable wettability.In this study,rGO coatings with micron pores and controllable oxygen contents are prepared on Al substrate via cathodic electrophoretic deposition and subsequent thermal annealing,leading to enhanced pool boiling performance.The heat transfer coefficient for Al/rGO450is 37.2 kW m-2K-1,which is increased by 112.6%compared with bare Al,also outperformed previously reported Al based substrates.It is assumed that the hydrophilic and aerophobic r GO coatings effectively promote the liquid infiltration and bubble departure during pool boiling process.Importantly,repeatability tests indicate the durable stability of vertically oriented rGO nanosheets.Reverse nonequilibrium molecular dynamics simulation indicates that the interfacial transmission coefficients of Al/rGO increase after thermal annealing,indicative of the enhanced heat transfer performance of heterogeneous interface.Our study opens a new avenue for endowing metal substrates with high pool boiling performance using porous carbon coating nanoengineering strategy with controllable morphology and components.
