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    题名 作者 年代 出处 被引量
1A new ent-atis-16-ene type diterpenol from Euphorbia sieboldiana显示文摘From the acetone extract of the root of Euphorbia sieboldiana,a new ent-atis-16-ene typediterpenol was isolated and its structure was demonstrated as ent-atis-16-ene-13 α-hydroxy-3,14-dione(1)based on the chemical as well as NMR and MS spectroscopic evidences,and finally confirmed by X-ray diffraction,DING,Yi-Li JIA,Zhong-Jian WANG,Qi-Guang CHEN,Ji-Hong LIU,Yu-Ting Institute of Organic Chemistry,Lanzhou University,Lanzhou 730000 Department of Chemistry,Xingjiang University. 1991Chinese Journal of Chemistry1991,9,2:5
2Concentration-cancellation phenomena for the velocity fields in incompressible fluid flows显示文摘A more intuitive sufficient condition is given for the concentration cancellation phenomena in 2- or 3-D incompressible fluid flows; that is,if the projection of concentration set of the weak-star defect measure associated with the approximate solution sequence onto space Rxn(n=2,3) is a set with Hausdorff dimension less than 1,then the weak L2 limit of the approximate solution sequence is a classical weak solution of Euler equation.Using this condition,an example is given to elucidate concentration-cancellation phenomena.郑琴 仇庆久 1997Science China Mathematics1997,40,11:0
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