浅析多环特性半导体封装测试系统的性能

半导体封装测试行业已经进入了一个快速发展的时期,面对市场规模的增长和产业竞争的加剧,对半导体封装测试系统的性能进行评估分析,对系统进行合理规划,具有重要的意义。

原煤中多环芳烃含量特性的初步研究

为了掌握煤燃烧过程中多环芳烃的排放特性 ,针对我国具有代表性的 5个煤种 2 0个煤样 ,经过索氏抽提、浓缩、纯化等步骤 ,对 17种多环芳烃进行了气相色谱的分析测定。在干燥无灰基碳含量 4 5 %～ 90 %之间 ,于 80 %～ 85 %区域多环芳烃的总量最大。随煤化程度提高 ,高环芳烃含量呈增加趋势 ,且原煤中碳含量、挥发分含量、氧碳摩尔比、氢碳摩尔比等参数与

Permeation Characteristics of Light Hydrocarbons Through Poly（amide-6-β-ethylene oxide） Multilayer Composite Membranes

In this paper, poly(amide-6-β-ethylene oxide) (PEBA1657) copolymer was used to prepare multilayer polyetherimide (PEI)/polydimethylsiloxane (PDMS)/PEBA1657/PDMS composite membranes by dip-coating method. Permeation behaviors of ethylene, ethane, propylene, propane, n-butane, methane and nitrogen through the multilayer composite membranes were investigated over a range of operating temperature and pressure. The permeances of light hydrocarbons through PEI/PDMS/PEBA1657/PDMS composite membranes increase with their increasing condensability, and the olefins are more permeable than their corresponding paraffins. For light hydrocarbons, the gas permeances increase significantly as temperature increasing. When the transmembrane pressure difference increases, the gas permeance increases moderately due to plasticization effect, while their apparent activation energies for permeation decrease.