For now, NASA wants to keep them shuttered most of the time to protect the fused silica glass from orbital debris.
根据美国宇航局的要求，为了保护这些石英玻璃窗不被轨道碎片击碎，它们大部分时间应该处于关闭状态。
A high purity silica mending material with pure fused quartz as material for glass kiln has been developed.
以高纯熔融石英为主要原料研制了一种高纯硅质玻璃窑用热补料。
Singlet and multielement lenses are available in a wide variety of configurations and materials, including glass, fused silica, sapphire, and calcium fluoride.
单谱线多元件透镜可以有不同的外形和材料，有玻璃的，二氧化硅的，蓝宝石的和钙氟化合物的。
The performance of radome materials are discussed such as microcrystalline glass, slip-cast fused silica, and silicon nitride etc in the paper.
介绍了微晶玻璃、石英陶瓷、氮化硅等几种天线罩材料的性能，重点探讨了可控密度氮化硅陶瓷材料的特点及在导弹天线罩上的应用。
The performance of radome materials are discussed such as microcrystalline glass, slip-cast fused silica, and silicon nitride etc in the paper.
介绍了微晶玻璃、石英陶瓷、氮化硅等几种天线罩材料的性能，重点探讨了可控密度氮化硅陶瓷材料的特点及在导弹天线罩上的应用。
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