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动方程。

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

摘要在性条件下，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动特性,综合考虑了液体可压缩性、魏氏效应、液体连续流动条件和动力特性,建立了直线电机采油泵运动规律精确运动微分方程组。

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.

摘要对一维情况下平面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。