第三个吻痕 - 何水水

In this article, we introduce a new family of sense preserving harmonic mappings f in the open unit disk and prove that functions in this family are close-to-convex. We give some basic properties such as coefficient bounds, growth estimates, convolution and determine the radius of convexity for the functions belonging to this family. In addition, we construct certain harmonic univalent polynomials belonging to this family.

中国临沂市沂水县水库河流数量众多，加之过去河道水库缺乏系统治理，水患频繁。水土流失、环境恶化，水库河流工程的水旱灾害防御功效减弱。近年来，该县着眼于总结水旱灾害防御工作方面的经验和做法，根据现代化治水、兴水、管水需求，更新理念，采取措施，全面消除水库河道安全隐患，还河库生态，守河库安澜。