气溶胶直接辐射效应对全球陆地生态系统碳循环的影响

论文利用通用陆面模式CLM4.0-CN对全球陆地生态系统生物地球化学循环过程进行模拟,分析气溶胶直接辐射效应对全球陆地生态系统碳循环的影响。结果表明：气溶胶直接辐射效应使2007年全球陆地生态系统平均总初级生产力（GPP）、净初级生产力（NPP）、异养呼吸（R_H）、自养呼吸（R_A）以及净生态系统生产力（R_eco）都呈现出增加的态势。具体的变化特征则随着地区不同而表现出极大的差异,在非洲中西部、中国中东部、美国东南部和欧洲中南部地区GPP增加,在南美洲亚马逊地区及东南亚等地区GPP减少。NPP和R_A与GPP的分布基本一致。分析发现,气溶胶直接辐射效应导致陆地生态系统碳循环发生变化有如下两方面原因： 1）散射施肥效应,即植被阴生叶可以吸收的散射辐射（光合有效辐射）增加使其光合速率增加;2）辐射变化导致温度和湿度条件发生变化,从而改变植物生物物理和化学过程速率。     

通信机房热环境下接续性电磁辐射点信息检测研究

提出一种改进双耦合Duffing系统自适应检测方法,并利用改进的滤波器对放大后电磁辐射点信号进行自适应滤波处理,消除信号中噪声干扰,降低电磁辐射点中含有的噪声,在此基础上,在双耦合Duffing系统中引入信号变尺度处理和自适应调整驱动力幅值的方法,实现通信机房热环境下接续性电磁辐射点信息检测.实验结果表明,所提方法能够有效抑制接续性电磁辐射点信号噪声,保证接续性电磁辐射点信息检测的准确性和完整性.     

微波循环热解对污泥固态产物特性的影响研究

文章以微波热解污泥固态产物为研究对象,考察6次循环热解对固态产物吸收微波能特性及吸附特性的影响,结果表明：微波热解污泥固态产物在6次循环热解过程中均可6分钟快速升温至750℃,具有较好的吸波特性;其吸附特性随循环热解次数的增加呈明显下降趋势。分析认为：粉末化、烧结熔融是破坏其孔径结构的重要因素,减少固态产物循环用作微波能吸收物质次数是保证其吸附特性的重要基础。     

Effects of UV-B radiation on the growth interaction of Ulva pertusa and Alexandrium tamarense

Enhanced UV-B(280-320nm) radiation resulting from ozone depletion is one of global environmental problems. Not only marine organisms but also marine ecosystems can be affected by enhanced UV-B radiation. The effects of UV-B radiation on interaction of macro-algae and micro-algae were investigated using Ulva pertusa Kjellman and Alexandrium tamarense as the materials in this study. The results demonstrated that UV-B radiation could inhibit the growth of Ulva pertusa and Alexandrium tamarense when they were both mono-cultured, and the growth inhibition of algae was more significant with increasing doses of UV-B radiation. Alexandrium tamarense could inhibit the growth of Ulva pertusa in mixed culture, and the growth inhibition was more significant when increasing the initial cell density. However, Ulva pertusa could inhibit the growth of Alexandrium tamarense in early phase and stimulate the growth in latter phase when they were grown in mixed culture. Lower initial cell density(10^2 cell/ml) of Alexandrium tamarense could inhibit the growth of Ulva pertusa under UV-B radiation treatment,however, with the initial cell density increasing( 10^3 and 10^4 cell/ml), the growth of Ulva pertusa was stimulated under lower dose of UV-B radiation and inhibited under higher dose of UV-B radiation by Alexandrium tamarense. Compared with that in mixed culture, Ulva pertusa showed more positive inhibition to the growth of Alexandrium tamarense under UV-B radiation treatment.     

日光辐照草酸铁盐体系降解水中低浓度混合药物及产物的生物毒性评价

在太阳光辐照下以三草酸合铁酸钾为催化剂,分解H2O2产生·OH,对水中的甲硝唑、双氯芬酸钠、磺胺甲基异唑和布洛芬4种常见的痕量药物污染物间歇降解与矿化,并且对降解前后水溶液的毒性进行了评价.以体系的总有机碳为指标,探讨了H2O2的初始浓度、三草酸合铁酸钾的投加量、体系的pH值等因素对水溶液中TOC去除率的影响,确定了最佳操作条件,根据4种药物的化学结构解释了它们在水中的降解速度.以药物水溶液对小球藻的EC50值为指标,对4种药物的联合毒性,以及降解中间产物的生物毒性做出了评价.结果表明,当4种药物的初始浓度都为20mg·L-1时,降解过程适宜条件是pH值为3,H2O2的初始浓度为300mg·L-1,三草酸合铁酸钾的投加量为75mg·L-1.4种药物的降解速度为:甲硝唑布洛芬磺胺甲基异唑双氯芬酸钠.随着中间产物的生成与降解,药物水溶液的生物毒性有先增大后迅速减小的趋势.最后给出了Solar/FeOx/H2O2体系降解水中低浓度药物的表达式.     

海水淡化浓盐水太阳能加热性能研究

实验采用真空管太阳能集热器系统,研究了太阳能对6波美度海水淡化浓盐水的加热性能。实验采用了自动采集与监测系统,主要考察了太阳能辐照度、环境温度、湿度、风速等四个气象因子以及进水流量、温度单因素对浓盐水太阳能集热性能的影响。研究结果表明,浓盐水的集热速率与太阳辐照强度关系最为密切,其他因子对浓盐水太阳能集热性能无显著影响。     

A solar hybrid thermoelectric generator and distillation system

A solar still of a single basin-slope coupled with a finned condensing chamber and installed thermoelectric modules at the bottom of the water basin has been presented in this paper. A mathematical model under steady state conditions has been introduced and improved to investigate the system performance. An increase of solar radiation and ambient temperature or a decrease in wind velocity affect positively the distillation rate, the still efficiency, and the system efficiency. Integrating a condenser and finned condenser increases the distillation rate of the proposed system. The results of the simulation have been verified by comparing them with published theoretical and experimental results, and the comparison shows very good agreement.     

某省医用电子直线加速器治疗室辐射环境监测分析

通过对省内医用电子直线加速器辐射环境监测,对比不同等级医院医用电子直线加速器辐射防护水平的差异,为放射治疗工作正常开展提供放射防护数据参考,确保放射工作人员、受检者及公众健康安全.按照标准方法采用辐射剂量仪AT1123及中子周围剂量当量仪BH3105E对加速器治疗室周围环境进行光子及中子的监测,采用热释光法对放疗科放射...     

左手材料在武器装备系统中的应用

论述了左手材料的奇异电磁特性以及各奇异电磁特性的潜在应用,分析了目前LHM在武器装备系统中的典型应用及其目前的发展现状,并对典型应用中的具体实例进行了详细分析,指出了左手材料在未来武器装备系统中的发展潜力及其重要意义。     

Degradation of Reactive Yellow 86 with photo-Fenton process driven by solar light

The decolorization of Reactive Yellow 86(RY 86),one of reactive azo dyes,was investigated in the presence of Fenton reagent under solar light irradiation.The decolorization rate was strongly influenced by pH,initial concentrations of H 2 O 2 and Fe(II),and so on.An initial concentration of 40 mg/L was decolored more than 90% after 20 min under optimum conditions.The activation energy of the solar photo-Fenton reaction was 1.50 kJ/mol for RY 86 in the temperature range of 10-60°C.In the kinetic study,the rate constant of RY 86 with OH· radicals could be estimated to be 1.7 × 10 10 L/(mol·sec).The decolorization efficiency of RY 86 under solar light irradiation was comparable to the artificial light irradiation.The decrease of TOC as a result of mineralization of RY 86 was observed during photo-Fenton process.The rate of RY 86 mineralization was about 83% under UV irradiation after 24 hr.The formation of chloride,sulfate,nitrate and ammonium ions as end-products was observed during the photocatalytic process.The decomposition of RY 86 gave two kinds of intermediate products.The degradation mechanism of RY 86 was proposed on the base of the identified intermediates.