It is rather complicated to compute the neutral axis in partially pre-stressed concrete beams after cracking, since we have to solve a cubic equation.
计算部分预应力混凝土梁开裂后截面应力时，需求解中和轴高度的三次方程，使计算显得比较复杂。
It is shown that the positions of phase saddles and vortices depend on the off-axis parameter, beam width, phase and relative amplitude of beams.
研究表明干涉场中的相位鞍点以及涡旋点的位置与光束的离轴参数、束腰宽度、相位以及相对振幅有关。
The study on collimation properties of semiconductor laser beams is valuable and the off-axis model can characterize accurately the output beams of semiconductor laser.
对半导体激光器光束准直场的研究具有重要的意义，半导体激光器的远轴模型能精确描述其发出的光束。
The vectorial properties of paraxial beams propagating along the optical axis of uniaxial left-handed materials are studied.
研究了沿光轴入射的傍轴光束在单轴左手介质中传输的矢量性质。
The fanning of the primary bundle of light beams (411) is achieved by refraction on rotationally symmetric interfaces (471, 472), which are variably inclined in relation to the optical axis (417).
所述初级光束（411）的发 散通过在多个以不同角度朝所述光轴（417）倾斜的旋转对称界面（471，472） 上发生折射而实现。
With the help of some formulae and simple iteration procedures the table and the diagram mentioned above can also be used for locating neutral axis of t beams.
对于截面形式较复杂的T形梁，提出了有关的参数计算式，仍可利用图表，通过简单迭代过程，求得T形截面开裂后的中和轴位置。
A new synthesis method for synthesizing on-axis flat-topped beams by using a defocusing telescope system;
提出了用平顶多高斯光束作为理想光束和使用离焦望远镜系统合成轴上平顶光束的一种新方法。
A new synthesis method for synthesizing on-axis flat-topped beams by using a defocusing telescope system;
提出了用平顶多高斯光束作为理想光束和使用离焦望远镜系统合成轴上平顶光束的一种新方法。
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