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Exhaust gas recirculation (EGR) is one of the major technical measures used on diesel engines to restrain NOx emission. Intake oxygen concentration has been proved to be the more substantial parameter to control NOx than EGR rate. However, the mechanism is hard to be utilized due to the difficulty of acquiring the real-time intake oxygen concentration. In the present study, a novel lambda-based intake...
Towards the objective of improving the gas dispersion performance, the dislocated-blade Rushton impeller was applied to the gas–liquid mixing in a baffled stirred vessel. The flow field, gas hold-up, dissolved oxygen, power consumption before and after gassing were studied using the computational fluid dynamics (CFD) technique. Dispersion of gas in the liquid was modelled using the Eulerian–Eulerian...
Taking into more account practical situation of Chinese securities market with non-convex non-concave typical transaction cost and revenue and measuring the risk of the securities by the conditional value at risk, we establish a portfolio model in which the expected income of portfolio is taken as objective function and Conditional Value-at-Risk is taken as a constraint. The model is solved by a particle...
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