It is common practice to describe propagation of one-dimensional acoustic waves in media possessing quadratic elastic nonlinearity and relaxation properties by the integro-differential equation [1] ((partial deriv) V)/((partial deriv) x) + α/(C_0~2) V (((partial deriv) V)/((partial deriv) τ)) = m/(2C_0) (partial deriv)/((partial deriv)τ) * ∫_(-∞)~τ ((partial deriv)V(τ_1))/((partial deriv)τ_1) exp (-(τ-τ_1)/T)dτ_1.
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机译：通常的做法是通过积分微分方程[1]（（偏导数）V）/（（偏导数）x）+α/（）描述一维声波在具有二次弹性非线性和弛豫特性的介质中的传播。 C_0〜2）V（（（偏导数）V）/（（偏导数τ））= m /（2C_0）（偏导数）/（（偏导数τ）*∫_（-∞）〜τ（ （偏导数）V（τ_1）/（（偏导数）τ_1）exp（-（τ-τ_1）/ T）dτ_1。
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