Meanwhile, we put forward symmetric correction to resolve inherent error cumulation of point-by-point imaging modality.

同时进一步提出对称校正的方法以解决逐点成像法固有的误差累积。

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In this paper, we present a kind of symmetric modified finite volume element method for nonlinear parabolic problems, and give the optimal order energy norm error estimates for full discrete schemes.

本文对一类非线性抛物型方程提出对称修正有限体积元方法，给出能量模最优阶误差估计，并证明了对称修正有限体积元方法的解与一般有限体积元方法的解之差是一个更高阶项。

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