给出适合铁路列车运行噪声特点的几何发散损失计算方法。
A calculation method for geometrical spreading loss is provided which is adapted to the characteristics of running trains noise.
推荐铁路列车运行噪声几何发散损失计算采用偶极子指向性特性的理论计算公式或简化公式。
It recommends that the calculation of geometrical spreading loss of running trains noise adopt the theories calculation formula or the simplified formula of directional characteristic of dipole.
根据基本声学理论，分析具有单极子、中间和偶极子三种指向性的有限长线声源的几何发散损失特性。
Based on the theory of acoustics, this paper analyzes the character of geometrical spreading loss of finite line sound source on three types of directivity-monopole, intermediate pole and dipole.
通过构造不同的图形去解一个几何概型问题，联想到发散思维能力的培养。
By structuring different figure to work out a geometry problem, this article associates to foster divergence thoughts.
根据晶体的对称性、衍射几何和衍射规律，研究了复杂的发散X射线晶体衍射。
Acoording to the crystal symmetry, diffraction geometry and the diffraction laws, the complicated divergent beam X-ray diffraction has been studied.
根据晶体的对称性、衍射几何和衍射规律，研究了复杂的发散X射线晶体衍射。
Acoording to the crystal symmetry, diffraction geometry and the diffraction laws, the complicated divergent beam X-ray diffraction has been studied.
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