QingNian Zhang

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In this paper, from the perspective of spatial economics, we studied the spatial spillover of public services and their effect on factor income. We establish a Nonlinear General Equilibrium Model, which contains " two regions, two sectors and two elements". For the determination of the spill-over effect, using Matlab mathematical software to draw a furger,(More)
With the shortage of resource and deterioration of environment, sustainable development and the circular economy have been the theme of the world today, and the reclaimed and recycle campaign of disused household appliances have arose the government and societypsilas highly attention. On the basis of summarizing domestic and overseas research about reverse(More)
Logistics costs often represent a large portion of the expenses of companies. In order to reduce them, location allocation and vehicle routing are crucial. In the administrative decision of the logistics, location allocation problems (LAP) and vehicle routing problems (VRP) are interdependent. But most of time, they are considered separately. This can not(More)
Supplier selection is a complicated and important work because of the fierceness of the contemporary market competition, supplier of the same kind of products is in large quantities, enterprises can not investigate each enterprise on the spot. Generally speaking, the supplier selectionpsila st.andard is mainly in quality, the price, deliver goods, service(More)
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