因此本文的内容主要是在总结一些成熟的研究经验的基础上,对有开洞墙体的框支梁在不同的结构条件下其内力变化的规律进行研究。
The variation equation describing distance dependence of the beam waist of a fundamental Gaussian beam with high intensity propagating in logarithmically saturable nonlinear media has been deduced.导出了在对数饱和非线性介质中传播的强激光基模高斯光束宽度随传播距离变化的方程。
Some factors such as oblique beam radiation and background intensity variation are also further discussed. These factors can decrease the precision of measure system.讨论了斜光束照射、背景光强变化等因素,这些因素降低了系统的测量精度。