The study indicates that there is no second-order nonlinearity for the cross-interaction of two different plane wave components, and that the sum of second-order cumulative wave caused by the self-interaction of each plane wave component constitutes ultimate second-order cumulative field of the finite acoustic beam. 结果表明,任意两个平面波相互作用不产生二阶积累波,伴随有限声束传播所发生的二阶积累波仅是各个平面波非线性自作用的结果。
Health behavior is a very complex phenomenon and it is the result of cross-interaction, penetration, impact and constraints among many factors. 健康行为是一个极为复杂的现象,它是许多因素相互交叉、渗透、影响和制约的结果。