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1一种提取ENSO—东亚冬季风稳定关系的可能方法显示文摘很多研究曾指出,厄尔尼诺—南方涛动(ENSO)与东亚冬季风存在显著的统计关系;且当北太平洋年代际涛动(PDO)处于正位相时,ENSO与东亚冬季风的统计关系不再显著。本文从动力学的角度,探索如何提取ENSO与东亚冬季风之间的稳定关系。结果表明,在剔除ENSO中PDO的线性信号之后,ENSO与东亚冬季气温呈现出持续,稳定的显著统计关系;该结果在多套再分析资料中得到了证实。其中的主要原因是:正位相的PDO能够抑制太平洋—东亚大气遥相关的建立,当剔除ENSO中PDO的线性信号之后,沃克环流对西北太平洋大气环流的影响加强,使得西北太平洋异常的反气旋能够向北延伸至黑潮地区;从而有利于太平洋—东亚大气遥相关的建立,进而有利于ENSO影响东亚冬季气温的变化。FAN Genchang LV Feng ZHANG Jinglong FU Jiao 2020Atmospheric and Oceanic Science Letters2020,13,4:0
2Effect of carbon addition on microstructure and mechanical properties of a typical hard-to-deform Ni-base superalloy显示文摘In this paper,the as-cast microstructure,microsegregation,and mechanical properties of GH4151 superalloys with a carbon addition were studied by scanner electron microscopy(SEM),transmission electron microscope(TEM),electron probe microanalysis(EPMA),differential thermal analyzer(DSC),and electron backscattered diffraction(EBSD).The results show that the solid solution effect of carbon in alloys is limited,the addition of C from 0.01 to 0.08wt%significantly refines the secondary dendrite spacing(SDAS)from 61.7 to 57.4 and 51.8μm.Due to the influence of thermal solutal convection,the most severe segregation is found in the C-0.04 alloy,and the solidification ranges of C-0.01,C-0.04,and C-0.08 alloys are 87℃,96℃,and 83℃,respectively.Owing to the reduced solidification pores and formed finely dispersed carbides,C-0.04 shows excellent ultimate tensile strength(442MPa)and superior total elongation(1.368%)at 1100℃ much better than that of C-0.01(130.7MPa,0.085%)and C-0.08(248MPa,1.026%).Lei Jia Heng Cui Shufeng Yang Shaomin Lv Xingfei Xie Jinglong Qu 2023Progress in Natural Science:Materials International2023,33,2:0
3Epidemiological and Clinical Characteristics of COVID-19 in Adolescents and Young Adults显示文摘BACKGROUND Adolescents and young adults might play a key role in the worldwide spread of Coronavirus Disease 2019(COVID-19)because they are more likely to be involved in overseas study,business,work,and travel.However,the epidemiological and clinical characteristics remain unknown.Jiaqiang Liao Shibing Fan Jing Chen Jianglin Wu Shunqing Xu Yuming Guo Chunhui Li Xianxiang Zhang Chuansha Wu Huaming Mou Chenxi Song Feng Li Guicheng Wu Jingjing Zhang Lian Guo Huawen Liu Jinglong Lv Lixin Xu Chunhui Lang 2020The Innovation2020,1,1:0
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