气压传动在正压氧气呼吸器中的应用研究

正压氧气呼吸器是一种小型、轻便、简洁的隔绝式、具有闭路呼吸循环系统的供氧保护装置。由于氧气是由高压氧气瓶供给的。不受外界气体的影响，因此，这种呼吸器可以在各种有毒气体或缺氧环境中使用。是矿山救护队的基本技术装备，是救护队员在抢险救灾中必须佩戴的器具。可广泛应用于矿山救护、石油、化工、消防、冶金、国防、核工业等领域。     

非传统安全环境下对我国水资源安全的思考

阅读提示在非传统安全视野下,水资源安全是国家安全的组成部分,是指在现有的经济、技术条件下,一国水资源能够满足该国经济建设和社会发展需要,公民依法享有的水资源不受污染和破坏的权利,以及政府依法履行公共权力确保水资源的自然循环系统不受到破坏或威胁,     

Preliminary study on treatment of waste organic matter from livestock by bacteria-mineral technology

The present study dealt with relationships between the degradation and humification process that the organic matter underwent during bacteria-mineral technology.An inverse correlation was found between the protein,lipid,and some of the humification indices considered,suggesting that the humification theory is actually humic substances produced from simple-structured natural organic substrates.Weight-average molecular weight (Mw),number-average molecular weight(Mn),and the ratio Mw/Mn of dissolved organic matters at difierent stages of the process were measured by gel permeation chromatography.The results showed that Mn and Mw increased with reaction time from 352 to 17,191,and from 78,707 to 104,564,respectively.The ratio of Mn/Mw decreased from 223.3 to 6.1.This reflected the growth of the polymerization degree of dissolvable organic matters in the process;furthermore,it indicated the formation of complex molecules (humic substances) from more simple molecules.Bacteria-mineral water(BMW) (the effluent of the process) treatments can exert hormone-like activity for enhanced seed germination of wheat and rice and greatly improved chlorophyll synthesis in wheat and rice leaves.Major polyamines (plant regulators) putrescine,spermidine,and spermine,were found in BMW by a high performance liquid chromatography (HPLC) method,which may explain the hormone-like activity of BMW.