The quadratic monotone interpolation characteristic difference method is proposed to overcome these defects.
为克服其不足，建立和研究了二次单调插值特征差分方法。
The present stage common method is utilize electric conduction nature and dielectric characteristic difference to recognize fluids, for example conductance method, electric capacity law and so on.
现阶段运用最多的是利用油气与水的导电性质和介电特性的差异识别井内流体的方法，例如电导法，电容法等。
First, the partial differential equations are transformed into discrete space, discrete time nonlinear difference equations through characteristic method and finite difference approach.
首先，通过特征线法和有限差分法得到了时间离散和空间离散的非线性状态方程。
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