By using a numerical method, the effect of changing in magnetic field upon vibration frequency and coefficientofreduction is presented.
最后给出数值结果，表明磁场的变化对振动频率及衰减系数的影响。
2
In situ magnetization X-ray powder diffraction method is firstly applied to measure magnetostriction coefficientofreduction iron powder.
首次报导X射线粉末衍射法测量铁粉晶胞的磁致伸缩系数。
3
The result shows that average absorption coefficient and noise reductioncoefficient separately equal to0.58and0.60 and fine property of sound absorption at middle-low frequency.