洁净钢生产中氮含量的控制

从氮在钢液中的危害出发,结合唐钢二钢轧厂PC钢冶炼情况,分析了PC钢BOF—LF—CC过程中钢液增氮的影响因素,提出减少钢液增氮的措施。     

酸性成纤维细胞生长因子对人脐静脉血管内皮细胞一氧化氮生成的影响

目的：观察人酸性成纤维细胞生长因子（haFGF）及其非促分裂型突变体（nmhamF）对人脐静脉血管内皮细胞（HEC）一氧化氮（NO）生成的影响。方法：实验分3组,分别为haFGF组、nmhaFGF组和对照组。用Griess反应法检测细胞培养上清NO相对含量（N嘎）。结果：haFGF和nmhaFGF都能诱导内皮细胞NO的生成,但同样条件下,nmhaFGF组诱导产生NO的相对含量与对照组比较在0．10、1．00、10．00、50．00、100．00ng／mL时均高（P〈0．01）。与haFGF组比较在0．10、1．00、10．00、50．00ng／mL时nmhaFGF组诱导产生NO的相对含量明显下降（P〈0．01）,在0．01和100．00ng／mL时也有降低（P〈0．05）。结论：nmhaFGF仍保留一定的诱导内皮细胞产生NO的作用,但NO生成量有显著下降。     

人工湿地系统处理上海崇明高浊度富营养化水体的研究

介绍了一种低技术系统——人工湿地应用于中国上海崇明岛处理农村高浊度富营养化水体。该系统由氧化塘和人工湿地复合而成。氧化塘内利用生态纤维填料强化微生物的种类和浓度,形成了藻菌共生体系;人工湿地底部基质采用比表面积大的陶粒,易于微生物挂膜和吸附悬浮颗粒物。结果表明:COD,TN,TP和浊度的去除率较高,平均去除率分别为43.60%,38.30%,65.38%和95.48%;处理效果呈现季节性变化,夏季净化效果最好。     

氮素营养诊断方法的应用现状及展望

阐述了土壤、植物氮素营养诊断方法的原理、优缺点及其应用情况，提出应用高光谱遥感和叶绿素荧光进行氮素营养诊断的可能性，并对完善氮素营养诊断方法和拓宽诊断内容提出了见解。     

马36区块氮气泡沫水交替驱室内评价研究

应用马36-5-5井地面分离器油气样按气油比24.7 m3/t进行配样,并用马36井区新下23和新下24-5的两组天然岩心进行了长岩心实验测试,研究注氮气泡沫水交替的驱油效率。研究表明,在水驱的基础上,第一组岩心新下23氮气/水交替提高采收率6%左右,氮气/泡沫水交替提高采收率10%左右,如若继续实验,采收率还会进一步提高。第二组岩心新下24-5氮气/水交替提高采收率3%左右,氮气/泡沫水交替提高采收率8%左右,同样如若继续实验,采收率仍会进一步提高。注泡沫水交替效果明显,获得的采收率更高。但是注泡沫水交替的时间较长,注入体积较大,注入压力上升快。     

Sodium Acetate Stimulates PHB Biosynthesis in Synechocystis sp. PCC 6803

IntroductionA large variety of bacteria are able to synthesizepolyhydroxyalkanoic acids (PHAs) and to depositlarge amounts of these polyesters as insolubleinclusions in cytoplasm[1 ] . PHAs have attractedthe interest of the chemical industry because oftheir biodegradable properties for applications invarious technical,medical,and pharmaceuticalapplications[2 ] .Poly-β-hydroxybutyrate(PHB) isatypical PHA that is produced by heterotrophicbacteria,such as Alcaligenes eutrophus andEscherichi…     

化学沉淀法脱除焦化废水中的氨氮

研究了pH值、温度、化学试剂Na2HPO4·12H2O和MgCl2·6H2O的加入量等对焦化废水中氨氮脱除效果的影响。实验结果表明,当焦化废水中添加的Na2HPO4·12H2O和MgCl2·6H2O使NH4+∶Mg2+∶PO3-4的比率为1∶1∶1时,在pH=8～10的条件下,无论是均合池的生化进水还是混沉池的生化外排水,都可以将其氨氮含量脱除至10mg/L以下。     

氨氮废水的处理

探讨了经Al3+改性并煅烧的膨润土对含氨氮废水的吸附特性,考察了pH、反应温度、反应时间、改性膨润土的用量等因素对改性膨润土吸附性能的影响.结果表明,经Al3+改性的膨润土对氮有很好的吸附性能,且当膨润土中Al3+质量分数为2.0%、经300℃煅烧2 h,在pH=6,Al3+改性的膨润土的用量为8 g/L,吸附时间为30 min的条件下,对100 mg/L含氮废水的去除率可达到92%,处理后的废水含氮量小于15 mg/L,达到了国家一级排放标准.     

Relations between the underground biomass and soil organic carbon and nitrogen of the alpine meadow at the Eastern Margin of the Qinghai-Tibet Plateau

This article, by combining field investigation with laboratorial analysis, studies diverse alpine meadow at the Eastern Margin of the Qinghai-Tibet Plateau for the underground biomass dynamics, vertical distribution of the content of soil carbon and nitrogen, the connection between the biomass and the content of carbon and nitrogen. The studies show that underground biomass in the herb layer of upland meadow is more than that in the terrace meadow, while underground biomass in the upland shrubland is the most. The vertical distribution of underground biomass of each type is obvious as in shape of＂T＂. As to the distribution of the content of soil organic carbon in the three sample grounds, it showed that the deeper the soil the less the content of soil organic carbon. In May, unlike at terrace meadow, the underground biomass and the content of soil organic carbon in positive proportion, such revelation at upland meadow and upland shrubland is not apparent. In July, at upland meadow and terrace meadow the underground biomass and the content of soil total nitrogen in positive proportion, such revelation at upland shrubland is not apparent either.     

空分常见“氮塞”故障分析及排除

空分产品氧取出量过大、上塔主冷中液氧液位过高或下塔液空纯度过低等异常都会引发氮塞故障,给氩系统的精馏工况,甚至企业的经济效益带来很大影响.对空分行业多种常见氮塞故障进行了分析,并提出了相应的排除方法.