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本文讨论了具有两个非线性项的四阶方程零解的稳定性问题。
In this paper, the problem about the stability of the zero solution of a set of four-order equations with two nonlinear terms is discussed.
通过四阶方程拟合实验数据和热力学数据得到的稳定带厚度更接近实际情况；
The calculated thickness of stability zone by the four-order polynomial using the experiment and thermodynamics data is close to practice.
研究一类四阶微分方程解的存在性，利用上下解及单调迭代的方法，得出这类四阶方程的最大解和最小解的存在。
We obtain the existence of extremal solutions of the boundary value problem by using the method of lower and upper solutions coupled with monotone iterative technique.
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