双凸透镜（Double Convex （DCX）Lenses） 双凸透镜有两个曲率向外的表面，正焦距。 双凸透镜的两个表面都是球面的，通常具有相同的曲率半径，在物距和像距相等或接近相等的情况下，可以最大限度地减少像差，可用于1:1成像系统。 平凹透镜 ...

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New quadrupole magnets for the High-Luminosity LHC will use Nb3Sn conductors for the first time in an accelerator.

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New surveys report that boys are feeling discouraged in the classroom and are less likely to go to college. Is this true in your experience? By Shannon Doyne How do these journalists craft ...