Local pointwise convergence of the 3D finite element

For an elliptic problem with variable coefficients in three dimensions,this article discusses local pointwise convergence of the three-dimensional(3D)finite element.First,the Green's function and the derivative Green's function are introduced.Secondly,some relationship of norms such as L^(2)-norms,W^(1,∞)-norms,and negative-norms in locally smooth subsets of the domainΩis derived.Finally,local pointwise convergence properties of the finite element approximation are obtained.

停服棉酚后人精子的超微结构观察

20例口服棉酚节育者,服药总剂量分别为2—13.95克,停药已2-8年,精子常规计数均曾回升至400万个/ml以上。采其精液作精子电镜观察,以探讨服棉酚停药后精子的超微结构改变。结果:精液中畸形精子数颇多,扫描电镜多见精子的颈、中段有异常膨隆;在透射电镜下,该膨隆区内包含有不规则形或成层板状的膜性小体,它们主要由核后环尾侧的核膜过度增生,向颈、中段胞质延伸而成,亦有反褶入胞核内,成为核内膜性包含体。