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Negative thermal expansion (NTE) material Sc2Mo3O12 was prepared by solid-state method. The phase structure, morphology and the thermal stability of the obtained products were examined by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric-differential thermal analysis (TG-DSC), respectively. To study its negative thermal expansion property, two methods were utilized. One is based on the in-situ XRD results and the thermal expansion coefficient (CTE) was calculated by the cell parameters obtained at different temperatures. Another is based on the thermo-mechanical analysis (TMA) and the CTE was calculated by the length of Sc2Mo3O12 bar at different temperatures. The differences between these two methods were also discussed.

A parallel hybrid power unit model has been established on Matlab/Simulink platform. A torque control strategy is put forward in this paper and four working conditions which include starting, acceleration, adding load and unloading are studied. The results of simulation indicates that the control strategy is feasible.