分次反单根及其分次补根

在群G是有限群时,构造了两个特殊类T,T′,使得K_G=T∪T′,其中K_G是全体有幂等分次心的分次亚直既约环的类;设α,α′分别表示由T,T′所确定的分次上根,则S_G=α∪α′,其中S_G是分次反单根;令R_G,R分别表示S_G,S的(分次)补根,则R_(ref)=R_G,而且R^G≤R_G。

油酸与亚油酸比例对煎炸油中单环氧脂肪酸单体含量的影响

油脂煎炸过程中,脂肪酸会氧化形成具有高吸收率和潜在毒性的单环氧脂肪酸。通过对薯条间歇式煎炸,研究煎炸油的油酸与亚油酸比例对单环氧硬脂酸含量、单环氧油酸含量以及顺、反式单环氧脂肪酸相对含量的影响。结果表明:单环氧脂肪酸含量随煎炸时间的延长呈现增长趋势;油酸含量高的煎炸油倾向于生成更多的单环氧硬脂酸,亚油酸含量高的煎炸油倾向于生成更多的单环氧油酸;煎炸过程逐渐积累更多的反式单环氧脂肪酸,顺式单环氧脂肪酸可能会转化为反式单环氧脂肪酸。

Comparison of Single Loop and Dual Loop PP Reactors and PP Product Development

The present status of PP technology in China is presented. Through a review of single loop and dual loop PP reactor technology as well as development and utilization of PP products it is concluded that import of PP technology should be based on the demand of PP products and market trend with consideration of local conditions. The existing problems and future development of PP technology in China are discussed.