China has experienced an unprecedented urbanization and industrialization in the past decades. In this research, we examined the dynamics of construction lands and impervious surface areas (ISA) based on land use/cove...China has experienced an unprecedented urbanization and industrialization in the past decades. In this research, we examined the dynamics of construction lands and impervious surface areas (ISA) based on land use/cover change and ISA datasets between 2000 and 2008, which were provided by the national resources and environmental remote sensing information platform. The results indicated that the construction areas and ISA increased by 3468.30 and 2212.24 km 2 /a in this period primarily due to the implementation of national macro-development strategies and fast-growing economy. In 2008, ISA accounted for 0.86% of the total land area in China. Urban land areas increased by 43.46% between 2000 and 2008. The annual growth rate of 1788.22 km 2 /a in this period was 2.18 times that in the 1990s. In particular, urban ISA increased by 53.30% between 2000 and 2008 with an annual growth rate of 1348.85 km 2 /a. During the 8 years, the ISA in China increased rapidly, especially in the Beijing-Tianjin-Tangshan Metropolitan Region, Pearl River Delta, Yangtze River Delta, and the western China region. The increasing ISA may influence potentially water environmental quality in the major basins. In particular, the number of subbasins having ISA of greater than 10% increased considerably, which were primarily distributed in the Haihe River, Yangtze River and Pearl River basins. In 2008, 14.42% of the basin areas were affected by the increased ISA.展开更多
RISC-V是一个基于精简指令集原则的开源指令集架构(Instruction Set Architecture,ISA)。首先对RISC-V的产生背景、指令集编码格式以及特点进行了相关阐述,并与现有指令集架构比较了各自的优缺点,其次重点分析了采用RISC-V架构的开源处...RISC-V是一个基于精简指令集原则的开源指令集架构(Instruction Set Architecture,ISA)。首先对RISC-V的产生背景、指令集编码格式以及特点进行了相关阐述,并与现有指令集架构比较了各自的优缺点,其次重点分析了采用RISC-V架构的开源处理器以及SoC,并对其性能进行分析比较,然后详细介绍了国内一些公司采用RISC-V架构设计的商业IP;最后展望RISC-V的发展前景。展开更多
基金supported by the Young Scientist Fund of National Natural Science Foundation of China (40901224)the National Basic Research Program of China (2010CB950900)+2 种基金the National Water Special Project(2009ZX-07207-011)the National Key Technology R&D Program(2012BAJ15B02)the National High-Tech R&D Program of China(2009AA122002)
文摘China has experienced an unprecedented urbanization and industrialization in the past decades. In this research, we examined the dynamics of construction lands and impervious surface areas (ISA) based on land use/cover change and ISA datasets between 2000 and 2008, which were provided by the national resources and environmental remote sensing information platform. The results indicated that the construction areas and ISA increased by 3468.30 and 2212.24 km 2 /a in this period primarily due to the implementation of national macro-development strategies and fast-growing economy. In 2008, ISA accounted for 0.86% of the total land area in China. Urban land areas increased by 43.46% between 2000 and 2008. The annual growth rate of 1788.22 km 2 /a in this period was 2.18 times that in the 1990s. In particular, urban ISA increased by 53.30% between 2000 and 2008 with an annual growth rate of 1348.85 km 2 /a. During the 8 years, the ISA in China increased rapidly, especially in the Beijing-Tianjin-Tangshan Metropolitan Region, Pearl River Delta, Yangtze River Delta, and the western China region. The increasing ISA may influence potentially water environmental quality in the major basins. In particular, the number of subbasins having ISA of greater than 10% increased considerably, which were primarily distributed in the Haihe River, Yangtze River and Pearl River basins. In 2008, 14.42% of the basin areas were affected by the increased ISA.
文摘RISC-V是一个基于精简指令集原则的开源指令集架构(Instruction Set Architecture,ISA)。首先对RISC-V的产生背景、指令集编码格式以及特点进行了相关阐述,并与现有指令集架构比较了各自的优缺点,其次重点分析了采用RISC-V架构的开源处理器以及SoC,并对其性能进行分析比较,然后详细介绍了国内一些公司采用RISC-V架构设计的商业IP;最后展望RISC-V的发展前景。
