光的偏振特性在机动车安全驾驶中的应用

根据光的偏振特性,利用偏振片制作机动车前大灯和偏振片眼镜,实践证明,可以提高机动车夜间行车的安全性.     

不可思议的文具店

正某个镇子上,有一家小小的文具店。那真是一家小店。入口只不过是两扇玻璃门,里头三个顾客就挤满了。而在店里头静静地守着柜台的,永远是一个戴着圆眼镜的老爷子。不过,在一部分孩子中间,这家店可是相当有名气的。另外,在一部分大人中间,它也挺有名。为什么呢?因为这家店里摆着的净是古里古怪的东西。比方说,飘着真正的花香的铅笔(绝对不是香料)。从彩虹上取来的颜色     

巴姆教授

 巴姆教授是个近视眼,总是神不守舍的样子。他总是埋头想着什么或是看点什么,很少注意身外的事。有一天,风和日丽,他在乡间的一条小路上漫步。     

Raman and optical absorption spectroscopic investigation of Yb-Er codoped phosphate glasses containing SiO_2

Yb-Er codoped Na2O-Al2O3-P2O5-xSiO2 glasses containing 0 - 20 mol% SiO2 were prepared successfully. The addition of SiO2 to the phosphate glass not only lengthens the bond between pS＋ and non-bridging oxygen but also reduces the number of P=O bond. In contrast with silicate glass in which there is only four-fold coordinated Si4＋, most probably there coexist [SiO4] tetrahedron and [SiO6] oetahedron in our glasses. Within the range of 0 - 20 mol% SiO2 addition, the stimulated emission cross-section of Era＋ ion only decreases no more than 10%. The Judd-Ofelt intensity parameters of Er3＋, Ω2 does not change greatly, but Ω4 and Ω6 decrease obviously with increasing SiO2 addition, because the bond between Er3＋ and O2- is more strongly eovalently bonded.     

裸眼观看3D图像的新技术

近日，美国帕洛阿尔托惠普（HP）实验室的研究人员发明了一种新的3D技术，利用该技术，影视观看者不仅不需要佩戴特殊的眼镜，而且还可以实现多角度观看。这项技术的进步将推进移动3D设备以及电视的发展。