The state equation of Pieoelectric beam is deduced directly from a piezoelectric physical equation in terms of a plane stress problem.
按平面应力问题，直接从压电物理方程出发，导出了压电梁的状态方程。
Heat transfer equation is a kind of basic mathematical-physical equation. The thermal diffusivity is an important thermal physical parameter for soil.
传热方程是一类常见的基本数学物理方程，热导率是土体重要的热物理参数。
The equation is different from other conclusions inferring and quoting curved beam differential physical equation(with same fundamental assumptions) in the correlative literatures.
该方程与相关文献中推导和引用的曲梁微分物理方程（基本假定相同）结论不同。
The stresses at the boundary can be calculated by the physical equation and the geometric equation according to the correlation between the stresses and the traction at the boundary.
构件边界上的应力可由弹性体的边界应力和边界面力的关系，通过物理方程和几何方程求出。
The stresses at the boundary can be calculated by the physical equation and the geometric equation according to the correlation between the stresses and the traction at the boundary.
构件边界上的应力可由弹性体的边界应力和边界面力的关系，通过物理方程和几何方程求出。
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