Organophosphate esters (OPEs) are used widely as additive in flame retardants, plasticizers, lubricants, consumer chemicals, and foaming agents. They can accumulate in aquatic organisms from water (waterborne exposure) and food (dietary exposure). However, the bioaccumulation characters and...

The emergence of a sharing economy increases the utilization of existing products/services and reduces the consumption of new resources. We consider a market where consumers are differentiated in their consumption level of the product and develop an analytical model to study how a sharing market...

Purpose With the continuous increase of users, resources and tags, social tagging systems gradually present the characteristics of “big data” such as large number, fast growth, complexity and unreliable quality, which greatly increases the complexity of recommendation. The contradiction...