Threats of a trade war between the world’stwo economic powerhouses faded on June 29after Japan and the United States struck a dealin their long and bitter feud over car markets.Week-long talks in Geneva drew to a clo...Threats of a trade war between the world’stwo economic powerhouses faded on June 29after Japan and the United States struck a dealin their long and bitter feud over car markets.Week-long talks in Geneva drew to a close onJune 28 with both sides hailing victory afternearly two years of dispute.展开更多
On June 2, US President Bill Clinton renewedthe Most-Favoured Nation trade status for Chinafor another year on the recommendation of USSecretary of State Warren Christopher.
Struggling to rebuild a mission near collapse,the UN Security Council voted on June 16 toenlarge its force in Bosnia to include up to12500 heavily armed troops.
Chinese Premier Li Peng said on June 10 that Sino-Peruvian trade and economic ties will improve. Li told Peruvian President Alberto Fujimori in Beijing that, as developing countries, the two nations shared similar vie...Chinese Premier Li Peng said on June 10 that Sino-Peruvian trade and economic ties will improve. Li told Peruvian President Alberto Fujimori in Beijing that, as developing countries, the two nations shared similar views on展开更多
A communique issued on June 16in Singapore at the end of a two-day Asean (Association of South-east Asian Nations) foreignministerial meeting called onall countries including theSoviet Union to urge Viet Nam toleave K...A communique issued on June 16in Singapore at the end of a two-day Asean (Association of South-east Asian Nations) foreignministerial meeting called onall countries including theSoviet Union to urge Viet Nam toleave Kampuchea.展开更多
)The 2008 IEEE World Congress on Computational Intelligence (WCCI 2008) will be held at the HongKong Convention and Exhibition Centre during June 1-6, 2008. WCCI 2008 will be the fifth milestone inthis series with a g...)The 2008 IEEE World Congress on Computational Intelligence (WCCI 2008) will be held at the HongKong Convention and Exhibition Centre during June 1-6, 2008. WCCI 2008 will be the fifth milestone inthis series with a glorious history from WCCI 1994 in Orlando, WCCI 1998 in Anchorage, WCCI 2002in Honolulu, to WCCI 2006 in Vancouver. Sponsored by the IEEE Computational Intelligence Society,展开更多
太阳活动低年夏季,低纬电离层F区场向不规则体表现出与太阳活动高年和其他季节明显不同的特征.本文利用我国三亚站(18.4°N,109.6°E,地磁倾角纬度dip latitude 12.8°N)VHF雷达、电离层测高仪、GPS闪烁监测仪和美国C/NOFS...太阳活动低年夏季,低纬电离层F区场向不规则体表现出与太阳活动高年和其他季节明显不同的特征.本文利用我国三亚站(18.4°N,109.6°E,地磁倾角纬度dip latitude 12.8°N)VHF雷达、电离层测高仪、GPS闪烁监测仪和美国C/NOFS卫星观测数据,研究了太阳活动低年夏季我国低纬电离层F区场向不规则体的基本特征.分析发现无论磁静日还是磁扰日,夏季电离层F区不规则体回波主要出现于地方时午夜以后,回波出现的时间较短,高度范围较小,伴随着扩展F出现,但没有同时段的L波段电离层闪烁.太阳活动低年夏季午夜后的低纬电离层F区不规则体回波,可能并不总是与赤道等离子体泡沿磁力线向低纬地区的延伸相关,而可能由本地Es等扰动过程引起.展开更多
基于江淮流域近53年(1961—2013年)逐日降水观测资料和NCEP/NCAR再分析资料,利用百分位法定义了江淮流域6—7月极端强降水阈值,通过经验正交分解(EOF)方法将极端强降水事件分为沿淮型、沿江型和江南型三种类型。选取各类型极端强降水事...基于江淮流域近53年(1961—2013年)逐日降水观测资料和NCEP/NCAR再分析资料,利用百分位法定义了江淮流域6—7月极端强降水阈值,通过经验正交分解(EOF)方法将极端强降水事件分为沿淮型、沿江型和江南型三种类型。选取各类型极端强降水事件的典型个例,对环流形势进行诊断分析,结果表明:三种典型极端强降水事件发生时,850 h Pa上均存在由华南西部向长江中下游的低空西南急流,沿淮型急流强度最强、急流轴位置最北,沿江型次之,江南型最弱、急流轴位置最南;500 h Pa西太平洋副热带高压脊线和西伸脊点异常主要通过改变急流轴位置,来影响极端强降水的落区;200 h Pa上高空西风急流均表现出强度偏强,急流带偏窄,高空急流入口的右侧与对流层低层西南急流北侧相重合。在高低空急流的共同作用下,极端强降水发生区域上方垂直速度异常偏强,比湿异常偏大,梅雨锋位置的差异决定了极端强降水的发生区域;无论是沿淮型、沿江型还是江南型极端强降水事件发生时水汽主要来自孟加拉湾到中国南海附近海域。展开更多
文摘Threats of a trade war between the world’stwo economic powerhouses faded on June 29after Japan and the United States struck a dealin their long and bitter feud over car markets.Week-long talks in Geneva drew to a close onJune 28 with both sides hailing victory afternearly two years of dispute.
文摘On June 2, US President Bill Clinton renewedthe Most-Favoured Nation trade status for Chinafor another year on the recommendation of USSecretary of State Warren Christopher.
文摘Struggling to rebuild a mission near collapse,the UN Security Council voted on June 16 toenlarge its force in Bosnia to include up to12500 heavily armed troops.
文摘Chinese Premier Li Peng said on June 10 that Sino-Peruvian trade and economic ties will improve. Li told Peruvian President Alberto Fujimori in Beijing that, as developing countries, the two nations shared similar views on
文摘A communique issued on June 16in Singapore at the end of a two-day Asean (Association of South-east Asian Nations) foreignministerial meeting called onall countries including theSoviet Union to urge Viet Nam toleave Kampuchea.
文摘)The 2008 IEEE World Congress on Computational Intelligence (WCCI 2008) will be held at the HongKong Convention and Exhibition Centre during June 1-6, 2008. WCCI 2008 will be the fifth milestone inthis series with a glorious history from WCCI 1994 in Orlando, WCCI 1998 in Anchorage, WCCI 2002in Honolulu, to WCCI 2006 in Vancouver. Sponsored by the IEEE Computational Intelligence Society,
文摘太阳活动低年夏季,低纬电离层F区场向不规则体表现出与太阳活动高年和其他季节明显不同的特征.本文利用我国三亚站(18.4°N,109.6°E,地磁倾角纬度dip latitude 12.8°N)VHF雷达、电离层测高仪、GPS闪烁监测仪和美国C/NOFS卫星观测数据,研究了太阳活动低年夏季我国低纬电离层F区场向不规则体的基本特征.分析发现无论磁静日还是磁扰日,夏季电离层F区不规则体回波主要出现于地方时午夜以后,回波出现的时间较短,高度范围较小,伴随着扩展F出现,但没有同时段的L波段电离层闪烁.太阳活动低年夏季午夜后的低纬电离层F区不规则体回波,可能并不总是与赤道等离子体泡沿磁力线向低纬地区的延伸相关,而可能由本地Es等扰动过程引起.
文摘基于江淮流域近53年(1961—2013年)逐日降水观测资料和NCEP/NCAR再分析资料,利用百分位法定义了江淮流域6—7月极端强降水阈值,通过经验正交分解(EOF)方法将极端强降水事件分为沿淮型、沿江型和江南型三种类型。选取各类型极端强降水事件的典型个例,对环流形势进行诊断分析,结果表明:三种典型极端强降水事件发生时,850 h Pa上均存在由华南西部向长江中下游的低空西南急流,沿淮型急流强度最强、急流轴位置最北,沿江型次之,江南型最弱、急流轴位置最南;500 h Pa西太平洋副热带高压脊线和西伸脊点异常主要通过改变急流轴位置,来影响极端强降水的落区;200 h Pa上高空西风急流均表现出强度偏强,急流带偏窄,高空急流入口的右侧与对流层低层西南急流北侧相重合。在高低空急流的共同作用下,极端强降水发生区域上方垂直速度异常偏强,比湿异常偏大,梅雨锋位置的差异决定了极端强降水的发生区域;无论是沿淮型、沿江型还是江南型极端强降水事件发生时水汽主要来自孟加拉湾到中国南海附近海域。
