新疆城市园林绿地生态系统建设应符合自然"绿脉"的发展方向

对新疆城市园林绿地系统的发展现状和存在的问题做了分析探讨,在充分分析论证了园林绿地系统形成过程中自然“绿脉”在调节城市生态环境的显著作用后,指出只有根据新疆本地特点,注重可持续发展的环境保护和向自然再投资,因地制宜的科学合理规划并形成一定规模的城市园林绿地生态系统,才是走新疆城市园林绿地生态系统建设可持续发展的正确道路.     

一种处理烟气的新方法：脉冲电晕等离子法

脉冲电晕等离子法烟气脱硝是近年来发展起来的一种物理和化学相结合高新技术，具有广阔的应用前景。本文介绍了脉冲电晕等离子法的电源和电极结构，阐明了此法烟气脱过脱硝的原理，去除效率及其影响因素，并提出了今后研究的方向和前沿课题。     

美国国会“电磁脉冲攻击对美国的威胁评估委员会”及其评估报告简析

为评估美国面临的电磁脉冲攻击威胁，并为美国电网等国家关键基础设施遭受敌国电磁脉冲攻击提出预防、保护和修复的建议，监督指导政府部门和军方开展电磁脉冲防御工作，美国国会从2001财年至2018财年，先后组建了四届电磁脉冲攻击威胁评估委员会。截至目前，该委员会已发布三次评估报告，其评估结论与建议为美国政府部门、研究机构等，社会各界开展各类评估、应对方案、提案提供了重要参考和依据。历届电磁脉冲攻击威胁评估委员会的成立，在美国电磁脉冲防御工作发展过程中都具有重要意义。简述了历届委员会的情况、评估要点和结论，重点分析了最新公布的2016财年委员会评估报告要点。     

脉冲放电粒子荷电机理的研究

脉冲电晕放电在脉冲期间产生大量的高能电子，形成粒子在电场中的电子荷电．依据粒子附近的电子密度Ｂｏｌｔｚｍａｎ分布和电子在粒子表面传输的速率方程，在电子的动能大于或等于粒子表面势垒能的边界条件基础上得到粒子在脉冲电晕场中粒子荷电的速率方程，并利用龙格库塔法求解荷电速率方程得到粒子在脉冲放电条件下的荷电量．计算结果表明脉冲放电下的粒子荷电量平均是直流电晕放电的离子荷电量的１８倍，最大荷电量是０５—１５μｍ范围内的粒子，荷电量是直流电晕的２６倍．这一结果不仅与Ｄａｖｉｄ的粒子自由电子荷电理论结果相似，而且与微细粒子电子荷电量测试结果基本一致．     

In situ IR,pulse reaction and TPD-ITD study of catalytic performance of room-temperature carbon monoxide oxidation on supported gold catalysts

With in situ IR, two different CO adsorption bands were detected on various chemical state gold catalysts. One band is attributed to the linear CO on an oxidized gold catalyst(2100 cm i ), the other one is ascribed to the bridged CO on metallic gold (2085 cm- i ). CO pulse reaction showed that Au/Fe203 catalyst had a room-temperature activity even in the presence of moisture. The produced CO2 was detained and more easily desorbed from supported gold catalyst than support oxide. TPD-IDT results indicated that the 02- superoxide ions are the possible active oxygen species.     

脉冲电晕等离子体烟气脱硫脱硝中试装置

简要介绍了建造于四川绵阳科学城热电厂的烟气处理量为 12 0 0 0～ 2 0 0 0 0Nm3 h的脉冲电晕等离子体烟气脱硫脱硝中试装置。给出了装置的工艺流程和平面布置 ,对装置系统各单元作了技术性描述。试验表明 :当能耗低于 5Wh Nm3 ,SO2 和NOX 的脱除率分别达 85 %、5 0 %以上     

Effect of activated NH3 on SO2 removal by pulse coronadischarge plasma in flue gas

ＩｎｔｒｏｄｕｃｔｉｏｎＮｏｗＳＯ2 ｉｓｔｈｅｏｎｅｏｆｍａｉｎｇａｓｐｏｌｌｕｔａｎｔｓａｎｄｔｈｅｍａｉｎｃａｕｓｅｏｆａｃｉｄｒａｉｎｐｒｏｂｌｅｍ .ＳＯ2ｒｅｍｏｖａｌｂｙ ｐｕｌｓｅｃｏｒｏｎａｄｉｓｃｈａｒｇｅｉｓａｎｅｗＤｅ ＳＯ2 ｔｅｃｈｎｉｑｕｅｄｅｖｅｌｏｐｅｄｄｕｒｉｎｇｌａｓｔｔｅｎ ｙｅａｒｓ(Ｍａｓｕｄａ ,1 993;Ｍｉｚｕｎｏ ,1 986 ;Ｄｉｎｅｌｌｉ,1 990 ) .ＳＯ2 ｉｎｆｌｕｅｇａｓｉｓｏｘｉｄｉｚｅｄｂｙａｃｔｉｖａｔｅｄｒａｄｉｃａｌ(ｓｕｃｈａｓＯＨ ,ＨＯ2 ,ＮＨ2 ,Ｏ)ｗ…     

Electrochemical analysis of endosulfan using a C18-modified carbon-paste electrode

Successful applications of different analytical procedures to determine quantitatively endosulfan and its metabolites in aqueous media can be found in recent literature. Fundamentally, they have made use of solid-phase extraction (SPE) and gas (GC) or liquid chromatography (LC), sometimes coupled to mass spectrometry (MS). In this paper, a new and alternative methodology to determine quantitatively endosulfan in aqueous media is reported. A C18-modified carbon-paste electrode has been used to determine voltammetrically endosulfan, despite its unfavourable electrochemical properties and behaviour. The methodology proposed is based on the decrease experienced by the peak intensity corresponding to voltammetric signals of Cu(II) when successive and constant additions of endosulfan are carried out. This decrease is directly proportional to the concentration of endosulfan what allows to perform an indirect quantification of the pesticide. The detection limit obtained is 40 ng l⁻¹, this value being under the limits specified by European norms and EPA reports.     

Polybrominated diphenyl ethers (PBDEs) in soils along a rural-urban-rural transect: sources, concentration gradients, and profiles

This study reports concentrations of PBDEs in surface soil samples collected along a 140 km transect across Kuwait to assess the role of urban centers as sources of persistent organic pollutants to the surrounding environment. The ΣPBDE concentrations varied by a factor of ∼250 and ranged from 289 to 80,078 pg g⁻¹ d.w. The concentrations of PBDEs in Kuwait City were significantly higher (p < 0.01) than those collected from sites outside the city supporting the hypothesis that urban centers are sources of PBDEs. The congener profiles were dominated by BDE-209, accounting for 93% of the PBDEs in the soil samples. The concentrations of all congeners (except BDE-209) were highly correlated with percent organic carbon (%OC) (p > 0.05) when the data from Kuwait City was omitted from the analysis. These findings suggest that soil concentrations outside the urban centers were close to equilibrium with the atmosphere.     

The performance of passive flow monitors and phosphate accumulating passive samplers when exposed to pulses in external water flow rate and/or external phosphate concentrations

Passive samplers are typically calibrated under constant flow and concentration conditions. This study assessed whether concentration and/or flow pulses could be integrated using a phosphate passive sampler (P-sampler). Assessment involved three 21-day experiments featuring a pulse in flow rate, a pulse of filterable reactive phosphate (FRP) concentration and a simultaneous concentration and flow pulse. FRP concentrations were also determined by parallel grab sampling and the P-sampler calibrated with passive flow monitors (PFMs) and direct measurement of flow rates. The mass lost from the PFM over the deployment periods predicted water velocity to within 5.1, 0.48 and 7.1% when exposed to a flow rate pulse (7.5-50 cm s⁻¹), concentration pulse (5-100 μg P L⁻¹), or both simultaneously. For the P-sampler, good agreement was observed between the grab and passive measurements of FRP concentration when exposed to a pulse in flow (6% overestimation) or concentration (2% underestimation).