北极涛动对华北沙尘暴频次的影响

This study has investigated the influence of Arctic Oscillation (AO) on dust storm frequency in North China in spring seasons during 1961-2007. There is a significant linkagebetween dust storm frequency and AO; a negative (positive) AO phase is related to an in-creased (decreased) dust storm frequency in North China. This relationship is closely related to changes in the cold air activity in Mongolia. The cold air activity exerts large impacts on the dust storm frequency; the frequency of cold air activity over Mongolia not only positively cor-relates with the dust storm frequency in North China, but also shows a long-term decreasing trend that is an important reason for the long-term decreasing of dust storm frequency in North China. The AO has large influence on the frequency of cold air activity over Mongolia; a negative (positive) AO phase is highly related to an increased (decreased) frequency of cold air activity over Mongolia, which results in an increased (decreased) dust storm frequency in North China.     

合成超重核~(270)Hs的最佳反应

宏观-微观模型[1]预言,在Z=108存在强的质子形变壳,而相应的中子壳位于N=162,预计270Hs是一“双幻数”形变核。因此,实验上合成270Hs,进而研究其核结构将很有意义。然而超重核合成截面很低,在pb(10-12barn)数量级,因而难度大。为了能成功的合成超重核,选择最佳弹靶组合和轰击能     

双源噪声驱动下布朗马达定向输运的分析

将系统利用非平衡涨落能量做功，看作是布朗马达受到内、外噪声作用的结果，并建立相应的含阻尼、双噪声的扩散模型。通过解析计算和数值模拟，在一维惯性锯齿势中，分析了粘滞阻力对定态流的影响。作为应用，初步解释了单个生物马达蛋白梯跳运动的实验现象。