利用多声子辐射和无辐射跃迁理论，讨论了实验结果。
The experimental results are analysed by means of the theory of multi-phonon radiative and non-radiative transitions.
由于辐射声子携带能量很少，需要多次散射过程使得电、声子趋于热平衡。
Because emitted phonons carry only little energy, multiple scattering processes is needed for electrons and phonons to reach thermal equilibrium.
我们数值地研究了镶嵌在方形排列的声子晶体中声源的能量辐射角度分布。结果表明，能量辐射角度分布和增强因子强烈地取决于源相对于所处单胞的位置的对称性。
The angular distributions of power and radiation enhancement factor strongly depend on the position of acoustic source relative to the unit-cell where the source is placed.
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