| 查看: 268 | 回复: 0 | ||
zhaofeng3211木虫 (正式写手)
|
[求助]
求翻译两段英文
|
|
The radiation shield is preferably made of silicon, graphite, or silicon carbide (SiC). The material for the radiation shield is not limited to the above though. The radiation shield can be made of any one or combination of two or more selected from the group consisting of, including the above-mentioned materials, silicon carbide-coated material, silicon nitrides (nitrified silicons), silicon oxides, aluminum oxides, boron nitrides, molybdenum or molybdenum-based alloys, tungsten or tungsten-based alloys, tantalum or tantalum-based alloys, silica-based porous materials, aluminosilicate-based porous materials, gold-coated porous materials, gold-coated materials, platinum-coated porous materials, platinum-coated materials, silica-coated porous materials, silica-coated materials, silver-coated porous materials, silver-coated materials, and perlite. The radiation shield reduces the thermal energy loss from the polysilicon rod by at least one of the following effects; thermal shielding effect by a hot emittance (>400° C.), shielding effect by multiple layers of radiation shields, shielding effect by a low emissivity of the radiation shield material, and insulating effect by reduction of thermal conductivity due to thickness. The efficiency of the shield is strongly dependent on its physical position within the reaction chamber. The shield must be placed in such a way that its source-facing surface (surface facing the heated polysilicon rod) is maintained hot (high temperature) by intercepting the thermal radiant energy leaving the heated rods. |
回复此楼» 猜你喜欢
环境专硕调剂
已经有7人回复
-
求调剂
已经有23人回复
-
301求调剂
已经有15人回复
-
304求调剂（085602，过四级，一志愿985）
已经有17人回复
-
302分求调剂 一志愿安徽大学085601
已经有12人回复
-
288环境专硕,求调材料方向
已经有23人回复
-
22408 调剂材料
已经有6人回复
-
285求调剂
已经有12人回复
-
求调剂
已经有6人回复
-
085600材料与化工301分求调剂院校
已经有19人回复
