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This article uses data envelopment analysis (DEA) model, the results of some listed companies in Jiangxi validity of an empirical study, through the DEA's analysis of technical efficiency and economies of scale derived: In order to achieve satisfactory operating results, non-DEA effective technical efficiency of listed companies and the slack variable should be in accordance with the values of variables...
This paper analyse the risk of enterprises implementation e-commerce strategy. E-commerce risk is divided into technical risk, operational risk, competition and environmental risks, At last, we address enterprises countermeasures how to avoid these risks.
In this work we present the research on pressure loss for a muffler with CFD method. Through using CFD technique, at a certain engine velocity, the flow field of a muffler is simulated and computed, and the total pressure distribution of gas flow internal the muffler is analyzed. It is opened out that with the inlet velocity increasing, the total pressure loss becomes higher and higher according to...
An efficient smoothed particle hydrodynamics (SPH) method for duct conveying is proposed. The combination of meshless and Lagrangian nature inherent in the SPH methodology avoids the disadvantages of traditional numerical methods in treating large deformations, large inhomogeneities and tracing free surfaces in the duct conveying process. Major physics of the duct conveying can be well captured in...
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