Photocatalytic degradation of mixed gaseous carbonyl compounds at low level on adsorptive TiO2/SiO2 photocatalyst using a fluidized bed reactor

An adsorptive silica-supported titania photocatalyst TiO(2)/SiO(2) was prepared by using nanosized titania (anatase) immobilized on silica gel by the sol-gel technique with the titanium tetra isopropoxide as the main raw material and acetic acid as the acid catalyst. Meanwhile the structure and properties of the TiO(2)/SiO(2) photocatalyst were studied by means of many modern analysis techniques such as TEM, XRD, and BET. Gas-solid heterogeneous photocatalytic decomposition of four carbonyl compounds mixture at low concentration levels over ultraviolet irradiated TiO(2)/SiO(2) photocatalyst were carried out with high degradation efficiencies in a coaxial triple-cylinder-type fluidized bed photocatalytic reactor, which provided efficient continuous contact of ultraviolet photons, silica-supported titania photocatalyst, and gaseous reactants. Experimental results showed that the photocatalyst had a high adsorption performance and a good photocatalytic activity for four carbonyl compounds mixture. Some factors influencing the photocatalytic decomposition of the mixed carbonyl compounds, i.e. the gas flowrate, relative humidity, concentration of oxygen, and illumination time, were discussed in detail. It is found that the photocatalytic reaction rate of four carbonyl compounds decreased in this order: propionaldehyde, acetone, acetaldehyde and formaldehyde.     

Chromium adsorption by aligned carbon nanotubes supported ceria nanoparticles

Ceria nanoparticles supported on aligned carbon nanotubes (CeO(2)/ACNTs), a novel adsorbent for Cr(VI) from drinking water, were prepared by chemical reaction of CeCl(3) with NaOH in aligned carbon nanotube solution and subsequent heat treatment. The best Cr(VI) adsorption effect of CeO(2)/ACNTs occurs at a pH range of 3.0-7.4. The largest adsorption capacity of CeO(2)/ACNTs reaches 30.2 mg g(-1) at an equilibrium Cr(VI) concentration of 35.3 mg l(-1) at pH 7.0. The experiment results suggest that CeO(2)/ACNTs have great potential applications in environmental protection.     

Field data: a study on trend and prediction of fatal traffic injuries prevalence in Shanghai

OBJECTIVE: The main objectives of the study are to analyze fatal traffic-injury trends in 1987-2003 in Shanghai and predict its prevalence in near future and provide scientific data for the local governmental decision on developing practical working methods on traffic-injury prevention and control. METHODS: In this study, epidemiological method and Grey dynamic model GM (1,1) were introduced to analyze and forecast traffic-injury mortality rates respectively. RESULTS: There was an apparent increasing trend of traffic-related injuries in Shanghai from 1987 to 2003 with the rate of growth in motorization. The average rates of annual increase are 3.59% in fatalities (from 7.78 per 100,000 population to 14.18 per 100,000 population) during the period. Pedestrians were the most common type of victims (29.6%), followed by bicyclists (25.1%), and motorcyclists (24.1%). Males accounted for the majority of all victims, over 69%. The population of high-school and lower high-school education level represented 66.4% victims of total road-traffic injuries. And if no special factors effect its development, the traffic fatalities would be up to 17.84 per 100,000 population in 2010, when calculating from equations we found and validated Y(t) = 359.90 x e0.027(t-1)-352.13, (t = 1, 2, ..., N) for Shanghai. CONCLUSION: Our data indicate the risk of fatal traffic injuries has increased in recent years and will go on growing in the near future in Shanghai. The findings showed that Grey dynamic model GM (1,1) is eligible on the prediction and can be a tool for injuries forecasting, implementing effective policies, programs, and interventions for reducing traffic injuries in the big cities.     

Inhibition mechanism of fermentation broth extract of Phomopsis sp. Strain S4 on cell membranes of Magnaporthe oryzae北大核心CSCD

The secondary metabolites of endophytic Phomopsis sp. strain S4 show antifungal activity against a variety of plant pathogens, which implies that strain S4 has potential prospect in crop disease control. The aim of this study was to explore the inhibition mechanisms of S4 against plant pathogenic fungi. Magnaporthe oryzae was used as the main pathogenic material for the research. Cell membrane changes were detected using antifungal experiments, scanning electron microscopy, Q RT-PCR, and cell content leaking experiments. The results of scanning electron microscopy showed that M. oryzae mycelia, after treatment with S4 fermented product extract, decreased in size, suggesting the integrity of the cell membrane was destroyed. The genes related to ergosterol synthesis, which plays an important role in membrane integrity, were studied though Q RT-PCR. The results showed that the expression levels of ERG1, ERG11, and ERG6 genes were down-regulated by 2.0, 1.40, and 2.7-fold, respectively, whereas that of ERG7 was up-regulated by 1.38-fold, which means the ergosterol synthesis pathway was destroyed. The physiological experiments also showed that the cell contents of M. oryzae mycelia treated with S4 fermented product extract leaked significantly, which was consistent with the Q RT-PCR results. The results showed that S4 fermentation broth exact could destroy the cell membrane integrity by inhibiting ergosterol synthesis, and eventually inhibit M. oryzae cell growth. © 2018 Science Press. All rights reserved.     

井场含油固体废物综合治理及应用研究

在井下作业中,原油、废水与地表土壤及铺垫井场地面的废钢渣等相混合,形成了特殊的作业井场含油固体废物。为此,采用了两种处理方法对该类含油固体废物进行综合治理研究。一是向受油污染的土壤中直接投放营养物,促进土壤里的细菌和微生物繁殖;二是将受油污染的土壤集中堆积在处理场进行统一处理。试验结果表明:第一种处理工艺要求较高,目前还难以推广应用。选用含油固体废物替代部分粉煤灰来烧制红砖,这种处理方法符合国家倡导的发展绿色环保型建筑材料的方向,为建材行业提供了优质的助燃材料。该技术比其他处理技术成本低,因此具有推广和应用价值。     

立式储罐变形评估的三维激光扫描实验

针对常规储罐检测工作量大、效率低的问题,利用三维激光扫描仪对某储罐进行外部检测,获取高精度的储罐三维点云数据,通过建模形成一个拟合罐体,与理想罐体进行3D比较得到储罐变形的整体情况,该方法能够对储罐的变形评估做出准确判断,距离储罐底板0.3 m处有最大径向偏差51.63 mm,0.9 m处有最大倾斜度0.177°,基于三维激光扫描技术为储罐罐壁变形检测提供了一种可靠的新方法。     

关于档案管理信息化与数字化的探索

随着电子技术、网络通信技术的迅速发展,档案信息化建设随之兴起.推进档案信息化建设,必需从档案信息标准化、档案信息数字化和档案信息网络化三方面着手,统一规划,加强管理,加大资金投入,加强专业技术人员培训.