Pressure-induced transition-temperature reduction in ZnS nanoparticles
The study of the structural transition in nanoscale materials is of particular interest for their potential applications. In the present study, we have observed a lower temperature T = 250??C for the phase transition from the sphalerite structure to the wurtzite structure in ZnS nanoparticles under a pressure of 1?GPa, as compared to those, T = 400 and 1020??C, for ZnS nanoparticles and bulk ZnS under normal pressure, respectively. The reduced transition temperature is attributed to the applied pressure leading to tight particle?particle contacts, which change the surface (or interfacial) environment of the nanoparticles and thus their surface (or interfacial) energy.
Directed against the principle of count by time-sharing and based on the parameter model of electrolytic zinc process,an optimization model of power supply for electrolytic zinc is established in this paper.Particle swarm optimization algorithm is applied in time-sharing power supply optimal dispatching system,obtaining optimal time-sharing power supply scheme to production.Results show that this system can effectively decrease the power consumption and create great economic profits.