Yiyuan Cheng

Learn More
A capillary electrophoresis approach with capacitively coupled contactless conductivity detection method has been developed for the determination of inorganic metabolites (thiocyanate, nitrite and nitrate) in human saliva. Field amplified sample injection, as a simple sample stacking technique, was used in conjunction for online preconcentration of above(More)
A new method based on discrete particle swarm optimization (dPSO) algorithm is proposed to solve the branch-cut phase unwrapping problem of MRI data. In this method, the optimal order of matching the positive residues with the negative residues is first identified by the dPSO algorithm, then the branch cuts are placed to join each pair of the opposite(More)
The exchangers on the top of tower exposed to wash erosion seriously when Shengli refinery processed Middle-east crude oil. Used grey system theory, aimed at general tube-shell exchangers and helix-baffled structure, tube of 20 carbon steel with TH847 coating, 20 steel aluminizing, 316L and dual phase steel, carried on grey decision. For exchangers(More)
The exchangers on the top of distillation tower exposed to wash erosion seriously when Shengli refinery processed Middle-east crude oil. Considered the heat transfer efficiency, manufacture fee, maintenance fee, manufacture difficulty and safety in exchangers rebuilding project, established mathematics model with grey system theory, and carried on grey(More)
Laser quenching and nitriding treatment has been performed on 35CrMoA steel, and the microstructure, hardness and wear resistance of laser quenching/nitrided layer were investigated by means of OM, XRD and TEM, microhardness tester and wear equipment compared with the gas nitrided layers. The results show that both nitrided layer consisted of ε,(More)
  • 1