Index series of Subtropical High over the western Pacific was extended to AD 1880 by using of statistical and modeling method. Reconstructed indices by both methods show good accordance each other. Association of the ...Index series of Subtropical High over the western Pacific was extended to AD 1880 by using of statistical and modeling method. Reconstructed indices by both methods show good accordance each other. Association of the indices to the rainfall patterns over eastern China indicated the robustness of the reconstructions.展开更多
A case is reported, during which the Subtropical High over the Western Pacific (hereafter, SHWP in abbreviation) shifted northwestward and met-yu at Chaniiang River valley ended. Several numerical experiments onSHWP a...A case is reported, during which the Subtropical High over the Western Pacific (hereafter, SHWP in abbreviation) shifted northwestward and met-yu at Chaniiang River valley ended. Several numerical experiments onSHWP activity influenced by the heating over south Asia monsoon area are carried out, and the statistic significance of the results is checked. The results indicate that the enhancement of positive heating over South Asia willmotivate a wave-like series of anomaly centers, which propagate northeastward from the maximum heating center.so that a strong positive potential height anomaly center will set up from North China to Japan at Day X resultingin the enhancement of SHWP. Comparison of the influence upon SHWP by the heating over south Asia monsoonarea with that over ITCZ area south to SHWP is also carried out. It is pointed out that the heating over South Asiamonsoon area tends to favor SHWP north\vard movement while the heating over ITCZ area tends to thvor SHWPwestward stretching. As for the time to begin to influence on SHWP, the heating over south Asia monsoon areafavors the enhancement of SHWP atter Day 3 while that over ITCZ south to SHWP effects atter Day 5.展开更多
The timing of the South Asian High(SAH) establishment over the Indochina Peninsula(IP) from April to May and its relations to the setup of the subsequent tropical Asian summer monsoon and precipitation over eastern-ce...The timing of the South Asian High(SAH) establishment over the Indochina Peninsula(IP) from April to May and its relations to the setup of the subsequent tropical Asian summer monsoon and precipitation over eastern-central China in summer are investigated by using NCEP/NCAR daily reanalysis data,outgoing longwave radiation(OLR)data and the daily precipitation data from 753 weather stations in China.It is found that the transitions of the zonal wind vertical shear and convection establishment over tropical Asia are earlier(later) in the years of early(late) establishment of SAH.In the lower troposphere,anti-cyclonic(cyclonic) anomaly circulation dominates the equatorial Indian Ocean.Correspondingly,the tropical Asian summer monsoon establishes earlier(later).Furthermore,the atmospheric circulation and the water vapor transport in the years of advanced SAH establishment are significantly different from the delayed years in Asia in summer.Out-of-phase distribution of precipitation in eastern-central China will appear with a weak(strong) SAH and western Pacific subtropical high,strong(weak) ascending motion in the area south of Yangtze River but weak(strong) ascending motion in the area north of it,and cyclonic(anti-cyclonic) water vapor flux anomaly circulation from the eastern-central China to western Pacific.Accordingly,the timing of the SAH establishment at the upper levels of IP is indicative of the subsequent onset of the tropical Asian summer monsoon and the flood-drought pattern over eastern-central China in summer.展开更多
电源管理芯片在超过可承受温度范围工作时会对自身造成不同程度的损坏,过温保护电路对提高该类芯片的可靠性和鲁棒性具有重要作用。文中设计了一种具有温度过高关断和温度过低提醒等双重功能的高精度过温保护电路。利用正、负温度系数...电源管理芯片在超过可承受温度范围工作时会对自身造成不同程度的损坏,过温保护电路对提高该类芯片的可靠性和鲁棒性具有重要作用。文中设计了一种具有温度过高关断和温度过低提醒等双重功能的高精度过温保护电路。利用正、负温度系数电压对芯片温度进行实时检测,并与带隙基准电路输出端的不同基准电压分别进行比较得到4个逻辑翻转点,进而通过高精度比较器电路和迟滞逻辑电路处理后,输出迟滞逻辑信号来控制芯片的工作状态或进行温度过低提醒。基于0.18μm BCD(Bipolar-Complementary Metal Oxied Semiconductor-Double diffused Metal Oxide Semiconductor)工艺设计并完成了相关仿真验证,仿真结果表明,在电源电压范围为3.0~5.5 V时,该电路输出端的迟滞逻辑翻转信号对应的温度阈值最大偏移量在0.3℃以内,具备较高的精度,可广泛集成于各种需要过温保护功能的电源管理芯片。展开更多
基金This work was supported by the National Key Programme for Developing Basic Sciences (G1998040900-Part-1).
文摘Index series of Subtropical High over the western Pacific was extended to AD 1880 by using of statistical and modeling method. Reconstructed indices by both methods show good accordance each other. Association of the indices to the rainfall patterns over eastern China indicated the robustness of the reconstructions.
文摘A case is reported, during which the Subtropical High over the Western Pacific (hereafter, SHWP in abbreviation) shifted northwestward and met-yu at Chaniiang River valley ended. Several numerical experiments onSHWP activity influenced by the heating over south Asia monsoon area are carried out, and the statistic significance of the results is checked. The results indicate that the enhancement of positive heating over South Asia willmotivate a wave-like series of anomaly centers, which propagate northeastward from the maximum heating center.so that a strong positive potential height anomaly center will set up from North China to Japan at Day X resultingin the enhancement of SHWP. Comparison of the influence upon SHWP by the heating over south Asia monsoonarea with that over ITCZ area south to SHWP is also carried out. It is pointed out that the heating over South Asiamonsoon area tends to favor SHWP north\vard movement while the heating over ITCZ area tends to thvor SHWPwestward stretching. As for the time to begin to influence on SHWP, the heating over south Asia monsoon areafavors the enhancement of SHWP atter Day 3 while that over ITCZ south to SHWP effects atter Day 5.
基金Major Program of the Natural Science Researches for Colleges and Universities in Jiangsu Province(14KJA170004)Natural Science Foundation of Jiangsu Province(BK20131432)+1 种基金"Qing Lan"Project of Jiangsu Province"333"Project of Jiangsu Province
文摘The timing of the South Asian High(SAH) establishment over the Indochina Peninsula(IP) from April to May and its relations to the setup of the subsequent tropical Asian summer monsoon and precipitation over eastern-central China in summer are investigated by using NCEP/NCAR daily reanalysis data,outgoing longwave radiation(OLR)data and the daily precipitation data from 753 weather stations in China.It is found that the transitions of the zonal wind vertical shear and convection establishment over tropical Asia are earlier(later) in the years of early(late) establishment of SAH.In the lower troposphere,anti-cyclonic(cyclonic) anomaly circulation dominates the equatorial Indian Ocean.Correspondingly,the tropical Asian summer monsoon establishes earlier(later).Furthermore,the atmospheric circulation and the water vapor transport in the years of advanced SAH establishment are significantly different from the delayed years in Asia in summer.Out-of-phase distribution of precipitation in eastern-central China will appear with a weak(strong) SAH and western Pacific subtropical high,strong(weak) ascending motion in the area south of Yangtze River but weak(strong) ascending motion in the area north of it,and cyclonic(anti-cyclonic) water vapor flux anomaly circulation from the eastern-central China to western Pacific.Accordingly,the timing of the SAH establishment at the upper levels of IP is indicative of the subsequent onset of the tropical Asian summer monsoon and the flood-drought pattern over eastern-central China in summer.
文摘电源管理芯片在超过可承受温度范围工作时会对自身造成不同程度的损坏,过温保护电路对提高该类芯片的可靠性和鲁棒性具有重要作用。文中设计了一种具有温度过高关断和温度过低提醒等双重功能的高精度过温保护电路。利用正、负温度系数电压对芯片温度进行实时检测,并与带隙基准电路输出端的不同基准电压分别进行比较得到4个逻辑翻转点,进而通过高精度比较器电路和迟滞逻辑电路处理后,输出迟滞逻辑信号来控制芯片的工作状态或进行温度过低提醒。基于0.18μm BCD(Bipolar-Complementary Metal Oxied Semiconductor-Double diffused Metal Oxide Semiconductor)工艺设计并完成了相关仿真验证,仿真结果表明,在电源电压范围为3.0~5.5 V时,该电路输出端的迟滞逻辑翻转信号对应的温度阈值最大偏移量在0.3℃以内,具备较高的精度,可广泛集成于各种需要过温保护功能的电源管理芯片。
