Tetrahedral platinum (Pt) nanocrystals (3-8 nm) are synthesized in high selectivity (ca. 80%) from hydrogen reduction of......

The h-version adaptive finite element method for 3-D seepage problem is presented in this paper.The adaptive system incl......

该文主要研究R3中四面体的Bonnesen型与逆Bonnesen型等周不等式.对于R3中给定的四面体,利用其表面积、体积、内切球半径及外接球半......