Based on diffraction theory a theoretical method for evaluating the three-dimensional focusing performances of the compound X-ray lenses is presented.
给出了基于衍射理论的评价X射线聚焦组合透镜三维聚焦性能的理论方法。
But the principle of focusing rays through an aperture onto a two-dimensional surface remains the same.
但其原理通过孔径聚焦光线在一个二维表面是保持不变的。
Years of focusing on close, two-dimensional work causes most children to become at least slightly nearsighted by the age of 10, say the researchers.
研究者表示，多年的近距离的、二维的课业使绝大多数孩子在10岁之前至少是轻度近视。
Three dimensional coordination polymers show self defocusing or self focusing effects depending on the valence shell structures of the central ions.
三维结构配位聚合物的自聚焦或自散焦效应主要受中心金属离子价层电子构型的影响。
One dimensional Fresnel zone phase correcting plate has its focusing characteristics similar to that of the paraboloid cylinder.
一维菲涅尔区相位修正结构具有类似于抛物柱面的聚焦特点。
Abstract : Focusing on the data lost or unavailable reference in cloud storage, a secure cloud storage method based on Three-Dimensional model (TD-model)was proposed.
本文针对云存储节点失效问题，提出了基于三维立体模型的安全云存储方法。
Using simple one-dimensional model, the parameters of the focusing properties such as the reflection efficiency can be calculated.
利用简单的一维模型，计算出X射线经微通道板后的反射效率等一系列聚焦参数。
Using simple one-dimensional model, the parameters of the focusing properties such as the reflection efficiency can be calculated.
利用简单的一维模型，计算出X射线经微通道板后的反射效率等一系列聚焦参数。
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