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据此，得到了SI电路的一般双二次实现。A general biquadratic realization is also proposed with this SI circuit.

本文主要研究双二次多项式的动力系统。D dissertation is concerned with the dynamics of biquadratic polynomials.

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二是基于双二次B样条局部插值的图像缩放算法。The second algorithm is to resize an image based on biquadratic B-spline local interpolation.

第三章研究了一个一维的四阶铁磁链方程。In chapter 3, a one-dimensional isotropic biquadratic Heisenberg spin chain equation is considered.

研究具有各向异性特征的双二次元对抛物积分微分方程进行了逼近。The approximation of the parabolic integro-differential equations is studied with anisotropic biquadratic finite element.

公式表明，不完全双二次多项式的DEM传递误差与双线性多项式的传递误差相同。The formula shows that the propagation error from biquadratic polynomial is the same as the error from linear polynomial.

本文研究具有各向异性特征的双二次元对二阶抛物方程的逼近。In this paper, the approximation of the second order parabolic equation is studied with the anisotropic biquadratic element.

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另外，本文还应用双二次元，讨论了抛物方程在全离散格式下的超逼近性质，同样得到了理想的结果。In this paper, the approximation of the second order parabolic equation is studied with the anisotropic biquadratic element.

特征波数的计算涉及到张量运算、矩阵运算、公式化简等。Parametric biquadratic equation whose roots are characteristic wave numbers is obtained after setting the determinant of eigen matrix to zero.

本文用四次方程代替常用的几个二次方程曲线的回转体，来描述对称裂交的大形变过程。In the paper, large deformation of symmetry fission has been described by a biquadratic surface revolution instead of several quadratic equations.

用倍角公式可将该三角函数方程转化成一个四次代数方程，然后用求根公式直接求出解析解。Double angle formula can transform the circular function equation to a biquadratic algebraic equation, and the analysis solution can be solved by extract equation directly.