In order to define this irrotationality condition mathematically, let us consider the equation of motion in terms of velocities.

为了从数学上确定此无旋性条件，我们考虑以速度为未知函数运方程。

A class of nonconforming finite elements are applied to hyperbolic equation with semidiscretization on anisotropic meshes, the optimal error estimates are derived.

摘向异性条件下，讨论了双曲型方程一类非协调有限元逼近，给出了半离散格式下最优误差佑计。

The condensability of liquid,the Westphal's effect and the continuous flow condition are not only comprehensively considered,but also the dynamic property of the ball valve being established.

结合场试验,根据直线电机采油泵运特性,综合考虑了液体可压缩性、魏氏效应、液体连续流条件和球阀特性,建立了直线电机采油泵球阀运规律精确运微分方程组。

The one dimensional continuity equations of n-on-p planar PN junction are solved at different boundary conditions. Generalized solutions of photocarrier concentration are given in this paper.

摘对一维情况下平面PN结连续性方程进行了求解，给出了不同边界条件下光生载流子浓度一般形式解，并对结果进行了分析讨论。