Considering fuel flow effect of reactor, neutron dynamic model was derived based on particle conservation equation and coupled with flow and heat transfer model. We developed a three-dimensional neutron/thermal-hydraulic coupled code and analyzed psychical property and thermal hydraulic characteristic of MOSART in transient state. It indicates that thermal hydraulic parameters influence greatly to psychical property of the core. Temperature negative feedback of liquid-fuel MSR is obvious.

Based on density functional perturbation theory, phonon properties and electron-phonon interaction in Bi₄Se₃ film system are studied with first-principles calculations. It shows that dynamic of Bi₄Se₃ film system for two terminations is stable. There exists mismatch in projected phonon density of states between Bi₂ bilayer and Bi₂Se₃quintuple layer. It prevents part phonons to transport in Bi₄Se₃ film, which leads to thermal conductivity reduce and improves thermoelectric performance of material. Besides, electron-phonon coupling constant of Bi₄Se₃ film in two kinds of termination are small (about 0.278), which is in favour of electronic device in room temperature.