正射线

本文分析了两只λ／4相位延迟片对正入射线偏振光的复合效应。

The compound effect of two λ / 4 retarders is given by the method of matrix optics .

一个设计良好的B-A计，利用其正反向X射线光电流间的自抵消使测量下限拓宽到10~（-11）Pa或更小是可能的。

It is possible to extend the low pressure limit in B-A gauge down to 10 ~ ( - 11 ) Pa or less by means of self-cancellation between the X-ray currents .

对于起伏地表条件下的地震叠前正演，射线追踪法可以灵活地处理起伏的地表条件，但是只包含了波的运动学特征，而且对复杂构造会出现盲区；

For seismic pre-stack forward modeling under rugged surface conditions , ray-tracing method can flexibly handle the rugged surface conditions , but it can only reflect the kinematical features of waves and blind areas might appear when the structures are complex .

依据正入射软X射线显微成像系统对聚光镜的要求，论述了采用掠入射聚光镜是最佳选择。

The optimum choice of grazing incidence on the basis of the demands soft X ray normal incidence microscopic optics is presented .

患者主要表现腰背痛及胸椎和腰椎正侧位X射线显示的骨质稀疏，椎体变形。

The main manifestations of the patients were low lack pain , and osteoporosis in thoracic spine and lumbar spine and vertebral deformation shown by X ray from frontal and lateral positions .