Evolution mechanism of logistics node system;

Method on Establishing the System Structure of Railway Logistics Nodes;

Location model of urban logistics nodes based on DPSO;

55 is generally used as flow conversion coefficient for distributing the way leak flow into the near node flow,and the error of calculation result is large sometimes,even exceeds the range of engineering precision.

The simulated calculation of nodal flow in sewage pipe network system is the essential work for the planning design and operation management of the urban sewage pipe network system.

In order to undertake the hydraulic analysis of urban sanitary sewer networks, the stochastic simulation of the nodal flow series is conducted in the paper.

This paper puts forward a new method of theoretic calculation pondering the random changes of nodal flow being determined by pressures,which can reach solutions with nodal flow and pressure,and computational example are induced showing the correctness and applicability of the method.

With a classification of goods and their logistics nodes (centers or facilities), and according to goods movements and other external conditions of the target year, this paper formulates planning scenarios for determining the final candidates from a preliminary selection of logistics nodes after consulting with local stakeholders.

The construction of regional logistics network should make clear about the target of service,take regional geography,economy and logistics into account,and define logistics nodes,routes and relationship clearly.

On the basis of the layout planning and the variety of logistics movements of multi-commodity logistics nodes,an optimization model was proposed.