9种补脑健脑食物

<正>随着年纪的增长,记忆力好像也越来越差了!下面推荐的9款平日常见的食物,具有较强的补脑健脑功效,日常饮食中可适当补充。鸡蛋大脑活动功能、记忆力强弱与大脑中乙酰胆碱含量密切相关。实验证明,吃鸡蛋的妙处在于:当蛋黄中所含丰富的卵磷脂被酶分解后,能产生出丰富的乙酰胆碱,进入血液又会很快到达脑组织中,可增强记忆力。国外研究证实,每天吃一两个鸡蛋就可以向机体供给足够的胆碱,对保护大脑、提高记忆力大有好处。     

循环冷却水水垢中锌含量测定优化实验研究

对工业循环冷却水水垢中锌含量的测定方法进行了系统优化,主要考察了样品酸度、缓冲溶液添加量、试剂时效性、样品中铁离子量、掩蔽剂量和滴定剂浓度对锌含量检测效果的影响。结果表明:样品酸度控制在pH=4.9~5.1范围内,乙酸-乙酸钠缓冲溶液添加量为30 m L时,锌含量检出值最大,指示剂灵敏度最佳;试剂乙酸-乙酸钠在20 d内使用、二甲酚橙指示剂即配即用对滴定终点的判断效果较好;锌含量测定前应先检测样品中铁离子含量,若铁离子≥40%则应先沉淀过滤后方可进行测定;锌含量检出值随掩蔽剂添加量呈先升后降的趋势,并在3.2 g时滴定效果最佳;滴定剂浓度为0.010 mol/L时锌含量检出值最高;优化实验测定结果接近真实值,方法准确可靠。     

日本离岛辐射监测系统概述

日本离岛辐射监测系统包括10处监测点,均建设于受人类活动影响较小的离岛之上,采用在线监测与实验分析相结合的方式,主要目的为对国内外核事故及国外核试验进行预警及对环境影响进行评估,在福岛核事故期间,该系统从空气吸收剂量率、气溶胶、沉降物、土壤和地表水中放射性物质含量对核泄漏对环境造成的影响进行评估,通过其监测结果,可见气溶胶及沉降物中134Cs和137Cs在事故后发生微量上升。     

填埋场中多酚氧化酶活性测定条件优化

以填埋场垃圾为研究对象,在土壤酶测定方法为基础上,对垃圾降解过程中多酚氧化酶活性测定方法进行优化.通过单因素实验和正交实验确定最优反应条件,并验证其精确度及稳定性.最终确定垃圾降解过程中多酚氧化酶活性测定的最优条件为基质取用10 mL、反应温度为30℃、缓冲液为8mL、反应时间为1.5h、萃取剂量为20 mL、萃取时间为50 min,且优化后测定条件实验结果的RSD小于2.22％,测定结果较传统方法提高了41％ ～ 90％,说明优化后结果准确可靠,为垃圾中多酚氧化酶的活性测定提供了新的方法基础.     

首信尾矿重金属环境地球化学实验研究

为了评估首信秘鲁矿业股份有限公司拟建选厂选矿实验中所产生的尾矿中重金属物质可能对环境造成的潜在影响,本文根据秘鲁能矿部环境事务总局的要求,以首信选厂选矿试验中的尾矿样品为研究对象,分别进行了尾矿摇瓶法试验(Shake Flask Extraction,SFE)、实验室尾矿风化湿筒试验(ASTM D5744-07标准)研究.试验结果表明:首信尾矿中重金属在酸性环境条件下最容易发生迁移转化,其次是模拟海水条件,最难的是超纯水环境。     

污水处理厂氨氮在线验收监测的现状及问题

氨氮在线监测仪近年已在污水处理厂得到广泛应用。通过在线监测技术提高污水处理厂处理效率是未来污水处理系统发展的重要方向之一。以辽宁省某污水处理厂水质在线监测系统为研究对象,采用对比实验的方法,对氨氮在线监测仪在验收过程中遇到的问题进行了总结,并提出了相应的建议。     

Experimental study on the impact of temperature on the dissipation process of supersaturated total dissolved gas

Water temperature not only affects the solubility of gas in water but can also be an important factor in the dissipation process of supersaturated total dissolved gas （TDG）. The quantitative relationship between the dissipation process and temperature has not been previously described. This relationship affects the accurate evaluation of the dissipation process and the subsequent biological effects. This article experimentally investigates the impact of temperature on supersaturated TDG dissipation in static and turbulent conditions. The results show that the supersaturated TDG dissipation coefficient increases with the temperature and turbulence intensity. The quantitative relationship was verified by straight flume experiments. This study enhances our understanding of the dissipation of supersaturated TDG. Furthermore, it provides a scientific foundation for the accurate prediction of the dissipation process of supersaturated TDG in the downstream area and the negative imp）acts of high dam projects on aquatic ecosystems.     

Experimental study of NO2 reduction in N2/Ar and O2/Ar mixtures by pulsed corona discharge

Non-thermal plasma technology has been regarded as a promising alternative technology for NOx removal. The understanding of NO2 reduction characteristics is extremely important since NO2 reduction could lower the total NO oxidation rate in the plasma atmosphere. In this study, NO2 reduction was experimentally investigated using a non-thermal plasma reactor driven by a pulsed power supply for different simulated gas compositions and operating parameters. The NO2 reduction was promoted by increasing the specific energy density （SED）, and the highest conversion rates were 33.7%, 42.1% and 25.7% for Ar, N2/Ar and O2/Ar, respectively. For a given SED, the NO2 conversion rate had the order N2/Ar 〉 Ar 〉 02/Ar. The highest energy yield of 3.31 g/kWh was obtained in N2/Ar plasma and decreased with increasing SED; the same trends were also found in the other two gas compositions. The conversion rate decreased with increasing initial NO2 concentration. Furthermore, the presence of N2 or O2 led to different reaction pathways for NO2 conversion due to the formation of different dominating reactive radicals.     

复合式缺氧-好氧膜生物反应器优化参数研究

设计具有同步脱氮除磷功能的复合式缺氧-好氧膜生物反应器,在保证COD去除率90%左右的基础上,对NH3-N去除率在85%~90%左右,对TP去除率在65%,能较好地实现对有机物的去除和同步脱氮除磷。并且通过优化运行操作参数改变混合液性质减缓膜污染。考察对膜污染影响因素的临界变量,延缓了膜污染。     

基于正交实验的电絮凝法预处理兰炭废水

采用电絮凝法预处理兰炭废水中COD。在装有可溶铁阳极、石墨阴极的PVC电解槽中进行了COD的去除研究,针对影响电絮凝工艺的主要影响因素(反应时间、进水pH、电流密度及极板间距)进行了正交实验。结果表明,在电絮凝进水pH为9~11条件下,极板间距为主要的影响因素。当进水COD为22 920 mg/L时,在电絮凝反应时间为3 h、进水pH为10、电流密度120 A/m2和极板间距为20 mm的条件下,COD去除率为22.9%;在此条件下,去除1 kgCOD消耗电能0.464 kW·h,消耗铁0.17 kg。