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The occurrence, speciation and transport of heavy metals in 9 coastal rivers from watershed of Laizhou Bay were investigated. The largest dissolved concentrations of Cd, Cu and Zn in water were 6.26, 2755.00, 2076.00 μg/L, respectively, much higher than several drinking water guidelines. The greatest concentrations of Cu, Zn, Cr, Ni, Pb and Cd in sediments were 1462, 1602, 196, 67.2, 63.5 and 1.41 mg/kg,...
Since China joined WTO, a situation of fierce competition emerged in the retailing market. But foreign enterprise groups represented by Wal-Mart of USA and Carrefour SA of France took over Chinese market one after another. These multinational groups compared with the Chinese retail enterprises, apart from its advantages in scale and capital strength, it is more important on the differences in the...
As a pillar industry of the national economy, the logistics shared a great responsibility in low carbon economy. This paper which based on the combination of qualitative analysis and quantitative model indicated that the logistics industry could promote the development of low carbon economy by integrating resources and optimizing configuration. But the effection is inflexible at present, the main...
The purpose of supply chain management is to keep balance between the improvement of customers' level and the cost of system. Nowadays, the customers' expectation index to the whole supply chain is the comprehensive ability of reaction speed, cost, quality and flexibility, which is just the demand for the service standard of third party logistics. With the development of global economy, Chinese logistics...
To provide a reference for management decision-making, evaluation index system and evaluation method are proposed to measure the level and degree of operation coordination between rail transit and bus transit. The idea of object-oriented is adopted to construct evaluation index system for operation coordination. The indexes for three objects are determined finally by modification, which are passenger-oriented...
Existing bus travel time prediction methods only provide a point prediction value of bus travel time. Relevance vector machine (RVM) is proposed for solving the problem. By using a probabilistic Bayesian learning framework, RVM can provide probabilistic prediction and obtain prediction value and variance of prediction error. For making use of historical data and current information, the running time...
This paper analyzed the basic model for the e-payment industry with the agent under the guidance of Two-sided Market, and introduced the 2-stage game of adoption strategies for both the Platform and the Buyer. Then the authors made a deep through case study for three dimensions: speed improving, convenience improving and safety improving, mainly based on the functions of the agents in e-payment application...
In this paper, logit models as well as mixed multinomial logit models(MMNL) were established to model traffic split. The properties of Johnson distribution bounded on both sides distribution was analyzed fisrt and it was found that Johnson distribution which are bounded on both sides can describe uniform preference factors better than normal and log- normal distribution. Based the residents' daily...
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