驻非营地蚊虫控制三道防线的建立及效果观察

目的为了防范中国驻非洲工程或项目人员被蚊虫叮咬而感染疟疾。方法通过建立三道防线(第一道防线为营地围界与居住建筑物外墙间,第二道防线为营地人居建筑物内外通道,第三道防线为室内人居场所),运用清、诱、灭、防、驱等手段,实施立体、生态、综合控蚊防疟措施。结果营地蚊虫幼虫在施药后36h旱季和雨季平均密度下降率分别为100%和99.54%,成虫在防治后24h旱季和雨季平均密度下降率分别为69.88%和70.18%,营地员工没有出现新发疟疾病例。结论防蚊控疟三道防线的建立,在非洲国家项目驻地预防和控制蚊媒传染病工作中,具有积极的引导意义和广阔的推广应用空间。

Bounded 3-manifolds with Distance n Heegaard Splittings

We prove that for any integer n≥2 and g ≥ 2, there are bounded 3-manifolds admitting distance n, genus g Heegaard splittings with any given bound-aries.

Annulus and Disk Complex Is Contractible and Quasi-convex

The annulus and disk complex is defined and researched. Especially, we prove that this complex is contractible and quasi-convex in the curve complex.