河南省流通优势面临的挑战及再造对策建议

流通连接生产和消费,是实现国民经济循环畅通的关键环节,是国民经济的基础性、先导性和战略性产业。在消费升级、产业加速变革、技术不断创新的大环境下,先进、畅通、高效的流通业支撑着产业链、供应链、价值链的有效连接,决定着经济循环的速度与质量。近年来,河南省在交通区位、现代物流、流通规模、枢纽地位等方面形成了一定优势,但同时面临交通枢纽地位追兵渐近、流通主体竞争力有待增强、平台集聚效应有待提升、流通先导性发挥不充分等挑战。提升交通物流能级、做大做强流通主体、扩大平台集聚效应、推动产业融合发展、构建流通良好生态等措施对推进河南物流业发展具有积极意义。

Promoting effect of ethanol on dewetting transition in the confined region of melittin tetramer

To study the influence of ethanol molecules on the melittin tetramer folding,we investigated the dewetting transition of the melittin tetramer immersed in pure water and 8%aqueous ethanol solution(mass fraction) by the molecular dynamics simulations.We found that the marked dewetting transitions occurred inside a nanoscale channel of the melittin tetramer both in pure water and in aqueous ethanol solution.Also,ethanol molecules promoted this dewetting transition.We attributed this promoting effect to ethanol molecules which prefer to locate at the liquidvapor interface and decrease the liquid-vapor surface energy.The results provide insight into the effect of ethanol on the water dewetting phenomena.

三相四线电能表中性线烧毁的原因和预防

本文首先分析三相四线电能表的应用优势,分析对三相四线电能表中性线烧毁现象造成的问题,并探讨三相四线电能表中性线烧毁的原因与预防措施。