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条件，我们考虑以速度为未知函数的运动。

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

要在各向异条件下，讨论了双曲型的一类非协调有限元逼近，给出了半离散格式下的最优误差佑计。

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,综合考虑了液体的可压缩、魏氏效应、液体连续流动条件和球阀的动力,立了直线电机采油泵球阀运动规律的精确运动微分组。

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.

要对一维情况下平面PN结的连续进行了求解，给出了不同边界条件下光生载流子浓度的一般形式解，并对结果进行了分析讨论。