站立工作者如何自我保健

镉是一种重金属,广泛应用于冶炼、合金制作、电镀、玻璃、油漆、颜料、照相材料、光电池、蓄电池、原子反应堆等工业项目。1993年,国际癌症研究机构将镉列为人类致癌物。目前,我国每年由工业废弃物排放到环境中的镉总量达680余吨。     

利用光能巨大磁效应有望开发光电池

据美国物理学家组织网近日报道,密歇根大学研究人员发现光也能产生巨大的磁效应,有望开发卅存储太阳能的“光电池”,替代传统的半导体太阳能电池。该研究发表在最近出版的《应用物理学》杂志上,校方正在为该方法申请专利保护．     

Pyrolysis of EVA and its application in recycling of photovoltaic modules

The basic pyrolysis behaviour of ethylene vinyl acetate(EVA) copolymer, which is often used as a lamination agent in solar modules, was investigated in thermogravimetry, differential thermal analysis(DTA) and thermovolumetry. The TG analysis showed that the EVA pyrolysis can be accelerated under the partial oxidizing atmosphere but the end pyrolysis temperature must be higher than in nitrogen, to eliminate the coke formed. Meanwhile, a strong exothermal peak occurs at about 450% under the air condition and gets weaker obviously at the oxygen content lower than 10 vol. %. The mass balance of EVA pyrolysis was given through the thermovolumetry with the output of l0 wt. % permanent gas, 89.9 wt. % condensate and 0.1% residual coke. Besides, the composition of the permanent gas and condensate at different pyrolysis stages were analysed and interpreted on the known pyrolysis mechanism.