The near-axisfield distribution of circular aperture antennas is obtained by numeric integration method.
采用数值积分方法分析了圆口径天线非轴向近场分布特性。
2
And, if you take a vector field where maybe everything is rotating, a flow that's just rotating about some axis, then you'll find that its divergence is zero.
如果取一个有旋的向量场，流体流动方向是环绕某个坐标轴的，那么就会发现它的散度是零。
3
When an electric field is applied to the electrodes the piezoelectric material translates this into a mechanical strain along its radial axis, causing it to vibrate.