The article study widening band of longitudinal mode piezoelectric transducers.
本文研究纵向振动压电换能器的频带展宽问题。
The attenuation factor of longitudinal wave was changing linearly, whereas the attenuation factor of the slow shear wave kept nearly constant with a low frequency on the exploration seismic band.
纵波的衰减系数在地震频带内基本上呈线性变化，而横波的衰减系数在地震频带内除低频外基本保持稳定。
The microstructure of longitudinal section in rebar was banded ferrite and pearlite and the ferrite band density reduced gradually along radius of rebar.
纵截面上，在铁素体基体上分布着沿轧向呈纤维状的珠光体，铁素体条带密度从边缘至芯部呈逐渐减少的趋势。
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