In this paper, we construct the general Darboux transformation on the Sasa-Satsuma equation and represent the iterated solutions in terms of the three-component Wronskian. From the onceiterated solution, we derive the breather as well as the single-and double-hump solitons. We also analyze three types of collisions: soliton-soliton, breather-breather and soliton-breather collisions. The surprising result is that the soliton-breather collision may exhibit the shapechanging phenomena, that is, one breather (or soliton) may change into a soliton (or breather) when interacting with another breather. Such novel collision phenomena may be applied in alloptical information processing, optical switching and routing of optical signals.
To research the reasons for the unsatisfactory hydraulic conditions of the reciprocating baffled flocculation tank, this paper investigates its flow field through PIV (Particle Image Velocimetry) laboratory experiment tests and numerical simulation. Three numerical schemes, the standard model, RNG model and realizable model, are calibrated and validated with the experimental data gained in this study. They are adopted for comparative study of their validity and accuracy for modeling the effect of the hydraulic characteristics of the flow field on flocculation. The best validated model is then applied to explain the reasons for the low flocculation efficiency and is applied to improve the structure of the reciprocating baffled flocculation tank.
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