成本导向下村镇物流运输系统评价与规划优化方法研究--以重庆市渝北区邮政物流为例

采用复杂网络分析方法,以村镇物流运输系统为研究对象,剖析村镇物流运输系统基本运行机理.通过对网络整体结构与个体特征的测度分析,挖掘控制村镇物流运输系统运行成本的重要设施,量化村镇物流运输环节的成本分布特征,进一步梳理村镇物流运输系统的成本构成规律并提出低成本运输规划模式,总结“精简区域循环、增强镇级职能、末端两段运输”的优化原则.结果显示,规划优化后的村镇物流运输系统总成本较之前降低了22.5%,末端设施成本分别降低了51.3%、26.1%.

Optimizing Reactors Selection and Sequencing: Minimum Cost versus Minimum Volume

The present investigation targets minimum cost of reactors in series for the case of one single chemical reaction, considering plug flow and stirred tank reactor(s) in the sequence of flow reactors. Using Guthrie's cost correlations three typical cases were considered based on the profile of the reaction rate reciprocal versus conversion. Significant differences were found compared to the classical approach targeting minimum total reactor volume.