1 . prevent electromagnetic radiation , protect eyes , refresh yourself . negative ion form the wall between computer monitor and computer operator , it neutralizes the positive electricity , reduce radiation caused by static to brain and eyes . iii 1 .防电磁辐射护眼提神：负离子能在电脑主机及显示器与人之间形成一道负离子墙，它与显示器释放的“ ”电荷缓润中和，降低静电对大脑和眼睛的辐射。
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The xrd results confirmed that the nanocomposite oxide has two kinds of material with sno2 and a - fe2o3 ; the uv spectra has more variety with the proportion changing of the two kinds oxide ; the fisps indicated that photoelectric property increased with the adding positive electricity field , and the biggest strength could reach 50 ~ 60 times . with an increment for negative electricity field , the photoelectric property reduced largely Xrd结果证实了所制备的纳米粒子为两种材料的复合氧化物;紫外可见吸收随两种氧化物复合比例的改变有较大的变化; fisps表明复合材料的光伏响应强度随所加正电场的增加而增加，最大强度可增加50 ~ 60倍，随所加负电场的增加而大大减弱。
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