In this paper, the reactance silencer with axis symmetry is analyzed in finite element method so as to establish a mathematic model for the programming of calculation of the trans-mission loss.
通过对轴对称抗式消声器进行有限元分析，建立其数学模型，对传递损失编制程序计算。
2
Eukaryotic gene cis-acting element includes the promoter, enhancer, silencer, which are the specific DNA sequences regulating gene transcription.