高 CO_2和低 O_2对鸭梨褐变的诱导

沟藏温度下,通过套袋使 CO_2浓度升高、O_2浓度下降,可致使鸭梨褐变溃烂。褐变前,鸭梨内源乙烯浓度迅速上升,组织电导增加,果实组织的膜结构受到损害。褐变时,多酚氧化酶活力提高。高 CO_2、低 O_2虽可延缓果皮叶绿素的降解而有较好的保绿效果,但果心却发生褐变溃烂。

Low H_(2)O_(2)consumption Fenton-like catalysts for pollutant cleavage based on the construction of a dual reaction center

High energy consumption has seriously hindered the development of Fenton-like reactions for the removal of refractory organic pollutants in water.To solve this problem,we designed a novel Fenton-like catalyst(Cu-PAN3)by coprecipitation and carbon thermal reduction.The catalyst exhibits excellent Fenton-like catalytic activity and stability for the degradation of various pollutants with low H_(2)O_(2)consumption.The experimental results indicate that the dual reaction centers(DRCs)are composed of Cu-N-C and Cu-O-C bridges between copper and graphene-like carbon,which form electron-poor/rich centers on the catalyst surface.H_(2)O_(2)is mainly reduced at electron-rich Cu centers to free radicals for pollutant degradation.Meanwhile,pollutants can be oxidized by donating electrons to the electron-poor C centers of the catalyst,which inhibits the ineffective decomposition of H_(2)O_(2)at the electron-poor centers.This therefore significantly reduces the consumption of H_(2)O_(2)and reduces energy consumption.

常温下不同低氧贮藏对松籽脂肪酸氧化的影响

本研究以朝鲜红松为试材,将松籽置于O2含量分别为2%±1%、5%±1%、10%±1%的密闭容器中,并以空气贮藏的松籽为对照(CK),研究了常温下(20￣30℃)贮藏180d期间松籽的脂肪酸氧化变化。实验结果表明:松籽的总脂肪含量和碘价在贮藏过程中下降,而酸价、过氧化值和皂化值升高;不同浓度低氧贮藏对于防止总脂肪的降解有显著的效果,贮藏180d时低氧贮藏松籽的酸价、过氧化值显著低于CK,而碘价则显著高于CK,2%低氧贮藏对于防止皂化值的升高也有明显作用。低氧能较好的抑制松籽脂肪酸氧化,有利于保持松籽的贮藏品质,其中2%低氧贮藏的效果最好。

智能模糊残氧控制

针对工业加热炉燃烧系统的多扰动、非线性、大滞后等特性，构造模糊控制器，应用控制系统优化技术，在线搜索最佳调整因子，及更新模糊控制规则，实现低氧控制。现场数据仿真获得较好效果。