Adsorption of ruthenium ions on activated charcoal： influence of temperature on the kinetics of the adsorption process

INTRODUCTION Time dependence study of metal ions adsorptionon solids provides valuable information on the ad-sorption process and its mechanism. Rate of metalions adsorption process is dependent on a number offactors such as agitation of the solution, the state ofmetal ions in solution, concentration of metal ions andtemperature (Benes and Majer, 1980). Temperature isthe parameter generally ignored in most adsorptionstudies (Bangash and Hanif, 1992; Afzal et al., 1993;Atun and Kil…     

Regeneration of nitric oxide chelate absorption solution by two heterotrophic bacterial strains

INTRODUCTIONThecombustionoffossilfuelsgeneratesSO2andNOxpollutantscausingairpollutionandacidrain.Existingfluegasdesulfurization(FGD)scru-bbersareefficientforcontrollingSO2emission,butareincapableofremovingwater-insolublenitricoxide.WeandotherresearcheshadreportedtheuseofmetalchelateadditivesinFGDsystemsforcom-binedremovalofNOxandSO2(Shietal.,1996a;1996b;1996c;1997;LittlejohnandChang,1990;Tsaietal.,1989;Harriottetal.,1993).FeII(EDTA,ethylenediaminetetraacetate)isoneofthemostprom…     

Experimental study on the inhibition of biological reduction of Fe(III)EDTA in NO_x absorption solution

INTRODUCTION Nitrogen oxides (NOx) are significant airborne contaminants resulting from fossil fuels combustion. The use of metal chelate additives for combined re- moval of NOx and SO2 in FGD (flue-gas desulfuriza- tion) systems was investigated by several groups (Harriott et al., 1993; Tsai et al., 1989; Shi et al., 1996a; 1997). Fe(II)EDTA (EDTA, ethylenediami- netetraacetate) as an additive for removing nitric oxide (NO) from flue gas had been extensively stud- ied, with the …     

基于小波包分析的电力系统故障类型的判别

介绍小波包的基本构造原理,讨论了小波包分析方法在电力系统中故障类型判别中的应用。并根据电力系统出现的具体实例,给出了仿真和比较结果。     

水煤浆技术在广东的应用与推广

在介绍水煤浆技术基本知识的基础上,结合广东的实际情况,从政策、社会效益、能源结构和企业利益等多个角度分析了该项技术在广东的应用前景,并对推广过程中应注意的问题作了简要分析和总结。     

浅论高职院校语文教育的定位

高职语文教育应打破传统观念,重新定位.即联系高职人才培养目标,将语文教育与培养学生的人文素养、职业道德、专业技能建设优秀的校园文化等有机结合起来,为培养高职技能人才创造优良的人文环境。     

Science Letters:Effect of nitrogen doping on the reduction of nitric oxide with activated carbon in the presence of oxygen

Nitrogen doping of activated carbon (AC) was performed by annealing both in ammonia and nitric oxide, and the activities of the modified carbons for NO reduction were studied in the presence of oxygen. Results show that nitrogen atoms were incorporated into the carbons, mostly in the form of pyridinic nitrogen or pyridonic nitrogen. The effect of nitrogen doping on the activities of the carbons can be ignored when oxygen is absent, but the doped carbons show desirable activities in the low temperature regime (≤500 ℃) when oxygen is present. The role of the surface nitrogen species is suggested to promote the formation of NO2 in the presence of oxygen, and NO2 can facilitate decomposition of the surface oxygen species in the low temperature regime.     

Effect of nitrogen doping on the reduction of nitric oxide with activated carbon in the presence of oxygen

Nitrogen doping of activated carbon （AC） was performed by annealing both in ammonia and nitric oxide, and the activities of the modified carbons for NO reduction were studied in the presence of oxygen. Results show that nitrogen atoms were incorporated into the carbons, mostly in the form of pyridinic nitrogen or pyridonic nitrogen. The effect of nitrogen doping on the activities of the carbons can be ignored when oxygen is absent, but the doped carbons show desirable activities in the low temperature regime （≤500 ℃） when oxygen is present. The role of the surface nitrogen species is suggested to promote the formation of NO2 in the presence of oxygen, and NO2 can facilitate decomposition of the surface oxygen species in the low temperature regime     

Imbalanced free radicals and antioxidant defense systems in schizophrenia： A comparative study

Objective： To examine changes of blood oxidative-antiovidative level in schizophrenic patients and its relationship with clinical symptoms. Methods： Forty-six Chinese patients met DSM-IV （Diagnostic and Statistical Manual of Mental Disorders-iV） criteria for schizophrenia and fifty age- and sex-matched healthy controls were enrolled in the present study. Baseline psychiatric symptom severity was assessed with brief psychiatric rating scale, positive and negative syndrome scale on the blood draw day. Fresh blood samples were collected to measure levels of nitric oxide and lipid peroxide in plasma as well as activities of superoxide dismutase, catalase and glutathione peroxidase in red blood cells by spectrophotometric assays simultaneously. Results Comparison of the biochemical parameters indicated that the level of nitric oxide and lipid peroxide increased in patient group, which represented a positive correlation with positive scale scores; while the activities of three critical enzymes decreased and showed a negative linear correlation. Conclusion： This study showed that there are dysregulation of free radical metabolism and poor activities of the antioxidant defense systems in schizophrenic patients. Excess free radicals formation may play a critical role in the etiology of schizophrenia. Using antioxidants might be an effective therapeutic approach to partially alleviate or prevent the symptoms of schizophrenia.     

运动训练中NO与心血管系统的研究现状与问题

一氧化氮（NO）对人体具有广泛的生物学效应。国内外对NO与运动训练中心血管的关系已有相关研究,但也存在不少的问题,所以这仍是一个值得研究的问题。     

急性肾功能衰竭家兔心肌损伤的体液机制

目的：观察急性肾功能衰竭（ARF）家兔心肌匀浆自由基、一氧化氮的变化,探讨心肌损伤的体液机制。方法：60只家兔均分为四组（n=15）。ARF模型1组：皮下注射1％HgCl2（1．3ml／kg．bw）;ARF模型2组：肌肉注射50％甘油（10ml／kg．bw）;以等量生理盐水代替HgCl2和甘油作为对照1、2组。24h后,所有动物颈总动脉放血备检,并选择固定位置。制备10％心肌匀浆。经Aeroset型全自动生化分析仪测定血清反映肾功能的生化指标。检测心肌匀浆丙二醛（MDA）、超氧化物歧化酶（SOD）、一氧化氮（NO）及其合酶（NOS）的变化。结果：与相应对照组比较,ARF模型1、2组心匀浆SOD活性下降、MDA含量升高（P〈0．05）,ARF模型1、2组心匀浆NO含量增强、NOS及iNOS活性增强（P〈0．05～0．01）。结论：ARF家兔心肌损伤的机制与自由基损伤及NO升高有关。