乌鲁木齐市彩叶树种种类及应用调查

在对乌鲁木齐市的公园、道路、庭院园林绿化中彩叶树种进行初步调查的基础上,依据文献资料对乌鲁木齐市彩叶树种观赏季节及叶色特性进行了初步分类,说明了其观赏特性与园林绿化应用,提出合理应用彩叶树种的建议,为乌鲁木齐市彩叶树种的引种、选择和应用提供科学依据。     

Assessing the impact of fungicide enostroburin application on bacterial community in wheat phyllosphere

Fungicides have been used extensively for controlling fungal pathogens of plants. However, little is known regarding the effects that fungicides upon the indigenous bacterial communities within the plant phyllosphere. The aims of this study were to assess the impact of fungicide enostroburin upon bacterial communities in wheat phyllosphere. Culture-independent methodologies of 16S rDNA clone library and 16S rDNA directed polymerase chain reaction with denaturing gradient gel electrophoresis (PCR-DGGE) were used for monitoring the change of bacterial community. The 16S rDNA clone library and PCR-DGGE analysis both confirmed the microbial community of wheat plant phyllosphere were predominantly of the γ-Proteobacteria phyla. Results from PCR-DGGE analysis indicated a significant change in bacterial community structure within the phyllosphere following fungicide enostroburin application. Bands sequenced within control cultures were predominantly of Pseudomonas genus, but those bands sequenced in the treated samples were predominantly strains of Pantoea genus and Pseudomonas genus. Of interest was the appearance of two DGGE bands following fungicide treatment, one of which had sequence similarities (98%) to Pantoea sp. which might be a competitor of plant pathogens. This study revealed the wheat phyllosphere bacterial community composition and a shift in the bacterial community following fungicide enostroburin application.     

额济纳天然胡杨林水分利用效率动态变化研究

黑河下游的额济纳绿洲是我国西北地区重要的生态屏障,也是当地人民赖以生存的自然资源,然而由于种种原因,这片绿洲正在衰败并且有消亡的危险.胡杨是典型的潜水旱中生植物,它虽然有较强的耐大气干旱、耐盐碱能力,其生长发育与水分条件的优劣有着十分密切的关系.本文通过研究额济纳天然胡杨的叶水势、蒸腾速率、光合速率的变化规律,综合分析其水分利用效率与叶水势的相关关系,了解胡杨树体内水分运移关系,为揭示胡杨生存现状和合理利用水资源提供理论依据,为合理保护额济纳绿洲胡杨林提供科学支持.     

徐州东亚钢铁有限公司

徐州东亚钢铁有限公司由李廷云、陈垒等股东投资8亿元人民币组建的一家民营钢铁企业。公司法人代表李廷云,注册资金16000万元,厂区占地面积为600hm^2,主要经营项目：钢铁冶炼、铸造生铁、连铸坯扎制、网盘条、棒材、带钢生产与销售等。第一期建成后年产生铁70万t、钢坯产量100万t,螺纹钢及普高线等产量95万t的生产能力。     

Influence of chlorine on methane oxidation

Experiments on CH4/Cl2/O2/N2 oxidation were conducted in an atmospheric pressure flow reactor to understand the influence of chlorine on hydrocarbon oxidation in hazardous waste incineration. The reaction temperature varied from 973 to 1273 K and the chlorine to hydrogen mole ratio (Cl/H) of the inlet mixture varied from 0 to 0.44. The species produced in the reaction were measured online with Fourier transform infrared spectroscopy (FT-IR). It was found that the destruction and removal e ciency of CH4 increased with Cl/H mole ratio. Increasing Cl/H favored COCl2 and CO formation and inhibited the CO oxidation process. As Cl/H approached 0.44, the concentrations of CH2Cl2 and CH3Cl first increased, and then declined. Reaction temperature greatly a ected the reaction system. Increasing temperatures raised the destruction removal e ciency of CH4 and decreased the concentrations of CH3Cl and CH2Cl2. With a certain ratio of Cl/H, the concentrations of CO and COCl2 first increased and then declined. The CO and COCl2 concentration peak was observed around 1100 K and 1023 K, respectively. When the reaction temperature exceeded 1273 K, carbon in CH4 was mostly converted to CO2. It could be concluded that the presence of chlorine enhanced the destruction of CH4, but resulted in the more toxic incomplete combustion products emission such as COCl2 when the reaction temperature was not high enough.     

Laboratory simulation of SO2 heterogeneous reactions on hematite surface under di erent SO2 concentrations

The variations of sulfate formation and optical coe cients during SO2 heterogeneous reactions on hematite surface under di erent SO2 concentrations were examined using in situ di use reflectance infrared Fourier transform spectroscopy (DRIFTS) and ion chromatograph (IC). Laboratory experiments revealed that within ambient SO2 of 0.51–18.6 ppmv, sulfate product, producing velocity, absorption and backward scattering coe cients showed an increasing trend with SO2 concentration. Under given SO2 concentration, the velocity of sulfate producing performed an evolution of initial increasing, midterm decreasing and final stabilizing. The reactive uptake and Brunauer-Emmett-Teller (BET) uptake coe cients of heterogeneous reactions rose with SO2 and exhibited high reactivities. Considering global warming, this result is important for the knowledge of heterogeneous reactions of SO2 on mineral particle surface in the atmosphere and the assessment of their impacts on radiative forcing.     

废聚氨酯硬泡热处理特性及产物检测分析

利用热重分析仪和管式炉研究了废弃聚氨酯硬泡热处理特性并对热处理产物进行了检测分析。研究结果表明,废聚氨酯硬泡热处理过程呈单一剧烈失重峰,热失重主要发生在200～440℃之间,600℃热分解基本完成;FTIR谱图初步分析发现加热分解过程中有大量CO和CO2产生,且热处理过程中可能有O-H、C-H、C=O及带有苯环的物质生成。通过GC/MS检测分析结果显示热处理液体产物中检出多元醇以及苯胺、p-苯胺、苯甲腈等多种芳香类化合物,气体产物以低碳的烷烃和烯烃为主,可见FTIR和GC/MS分析结果有很好的一致性。研究结果显示,气体产物检测出有机氯化合物,这可能是聚氨酯硬泡生产过程中加入的氟利昂类发泡剂所致。     

纳米TiO_2的溶胶-微波法合成及其光催化性能研究

以钛酸四正丁酯为原料,采用溶胶-凝胶法、溶胶-水热法及溶胶-微波法三种方法合成出纳米TiO2,借助XRD、UV-Vis吸收光谱等测试手段对其进行了表征,并以甲基橙为模型污染物,考察了样品的光催化性能。物相分析表明,所得样品均为锐钛矿相TiO2,与其它两种方法相比,溶胶-微波法合成的样品衍射峰明显宽化,强度明显降低,说明该法合成出纳米TiO2粒径较小;UV-Vis吸收光谱表明,溶胶-微波法合成的样品在可见光区和紫外光区对光均呈现更强的吸收,说明该法合成的粉末对光具有更高的利用率。光催化实验表明,溶胶-微波法合成样品的光催化活性高于另两种方法,紫外灯连续照射5h,甲基橙溶液脱色率为99.06%。此外,将该样品用于延安卷烟厂蒸叶车间废水的光催化氧化处理,效果较好,太阳光照射3d后COD去除率为77.4%。     

基于同步辐射光源的X射线荧光分析技术研究匐枝青藓对铅污染的生物响应

为了研究苔藓植物对铅元素的富集特征和对铅污染的生物响应特性,选用多年生、植株体较大、分布广泛且易于采集的匐枝青藓(Brachythecium procumbens)为试验材料,在试验区使用不同浓度(0-3.0 mmol·L-1的Pb2+污染液对人工栽植的匐枝青藓进行了动态胁迫试验(7-28d).使用同步辐射光源的x射线...     

Biosorption of mercury by Macrocystis pyrifera and Undaria pinnatifida: Influence of zinc, cadmium and nickel

The article investigated the adsorption of Hg(II) on Macrocystis pyrifera and Undaria pinnatifida in monometallic system and in the presence of Zn(II), Cd(II) and Ni(II).