self modulation meaning in Chinese

自调制
自动调制

A new type of resonant in x - band is given . the eigenfrequencies and eigenfunctions of tm mode of three four and five - cavity resonant is studied . the self modulation of the working modes which are 2 / 4 mode in three - cavity , 3 / 5 mode in four - cavity , 4 / 6 mode in five - cavity is simulated by pic code magic
采用粒子模拟的方法分别研究了电子束与三腔、四腔、五腔的互作用，研究结果表明：三腔中2 / 4模、四腔中3 / 5模、五腔中4 / 6模是工作模式。