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The influence of calcination temperature on TiO2 nanotubes＇ catalysis for TiO2/UV/03 was investigated. TiO2 nanotubes （TNTs） were prepared via the sol-gel method and calcined at 300--700 ℃, which were labeled as TNTs-300, TNTs-400, TNTs-500, TNTs-600 and TNTs-700, respectively. TNTs were characterized by transmission electron microscopy （TEM） and X-ray diffraction （XRD）. It is found that TNTs calcined at 400 ℃ showed the best thermal stability. When the calcination temperature increased from 400 ℃ to 700 ℃, the special structure of tubes was destroyed and gradually converted into nanorods and/or particles. The transformation from anatase to rutile occurred at 600 ℃, and the rutile phase was enhanced when the calcination temperature was increased to over 600 ℃. The calcina- tion temperature＇s influence on TNTs＇ adsorption activity for for TiO2/UV/O3 was investigated in landfill leachate solution chemical oxygen demand （COD） and catalytic activity In landfill leachate solution, the adsorption activity of COD decreased in the reduced order of TNTs-300, TNTs-400, TNTs-500, TNTs-600 and TNTs-700. In photocatalytic ozonation, TNTs-400 showed the best catalytic activity while TNTs-700 exhibited the worst. In other three processes, the COD removal of TNTs-300/UV/O3 was higher than those of TNTs-500/UV/O3 and TNTs-600/UV/O3 in the first 20 rain, and then became close to those of the latter two in the following 40 rain. Compared with TNTs-300 and TNTs- 400, TNTs-600 had the best anti-fouling activity, while TNTs-500 and TNTs-700 had lower anti-fouling activity than the former three. In photocatalytic ozonation, the calcination temperature of 400 ℃ was appropriate when TNTs were obtained at the synthesis temperature of 105 ℃. 相似文献
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数据中心就是数据大集中而形成的集成IT应用环境,电视行业的人士清楚地认识到一个智能化数据中心,才能稳定、可靠地跨越多种设备和平台为电视台提供服务,在激烈的行业竞争中占得先机。本文从环境设计、线缆分布、设备管理和审计的角度阐述数据中心的设计和实现。 相似文献
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季民 《江苏经贸职业技术学院学报》2004,(4):31-34
商业企业和生产企业的关系是最重要的社会经济关系之一。在“生产决定论”的理论指导下 ,生产企业作为市场的主导 ,对商业零售业和流通业诸企业进行“整合”。这是生产企业所谓的“顺向整合”。在“零售终端决定论”的理论指导下 ,由商业零售业和流通业诸企业 (特别是那些市场占有率特别大的巨型企业 )为市场的主导 ,对生产企业进行的“整合” ,被称为“逆向整合”。在“顺向整合”条件下 ,生产企业对市场有充分的发言权 ;在“逆向整合”条件下 ,商业零售业和流通业企业对市场则有充分的发言权。“谁掌握了零售终端 ,谁就掌握了社会经济发展的未来。”这已经成为现代社会的营销法则。在市场完全开放的今天 ,外资商业零售企业完全可以利用其在中国的采购中心 ,通过提高或者减少某些产品的采购额 ,来促进或者遏制我国某些产业的发展 ,左右我国产业发展的方向。这样的“逆向整合”后果将不堪设想。 相似文献
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随着社会经济的发展。科学技术的进步，车床逐渐演变成录今社会常见的机械生产加工装备，但是它也是非常容易发生故障的，本文在简单讨论葛车床故障分类的基础上，着重对车床主轴、刃架等系统的常见故障展开了分析讨论，并有针对性的提出了维护保养的措施，对于进一步提高车床的弭艮役寿命、减少故障发生率有一定的指导意义。 相似文献
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(晋南儿歌) 全 4 李民词 谢晓妮曲 53 八1 2星」}争 个在 有栓 天上 秋风 厂、 65 11 大果 月亮 湾线 亮线 月穿 个天 有上 56 53 沪一-心~~~~、 匕J。 厂、 16 梦 不 翔的 50 尽， 梦， 1数飞 的 星中 星心 的娃 湾娃 亮家 月农 园， 湾， 6 1 61 26 }.!l，./、_ 1一}1一咋!11些 50 完千 不秋 摘荡 果悠 苹悠 果园里的 抱住苹果 天在转 ︵.二. a.;}5。}旦些 15 金蛋 厂-一--一、 ，一}; 地在转，苹果变成 蛋 天‘在 50 转 ;}5。 在转， 32 }于一万几 卜匕蜜甜 华蛛 卿料 6.地 14梦苹果(晋南儿歌)@季民
@谢晓妮~~… 相似文献
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Allelopathic effects of submerged macrophytes against algae are affected by many environmental factors which can only be measured one by one by traditional methods. Box-Behnken design of response surface methodology was used to optimize three environmental factors(temperature, light intensity and total dissolved solids) of allelopathic effects of Potamogeton pectinatus against Microcystis aeruginosa at the same time. By solving the regression equation and analyzing the response surface contour plots, the optimal conditions of the relatively inhibitory rate of Microcystis aeruginosa were that the temperature was 23℃, the light intensity was 2,700,lx and the total dissolved solids were 4,415,mg/L. Under these conditions, the optimal value of relatively inhibitory rate of Microcystis aeruginosa was 81.9%. According to validation experiments, the results of analysis indicated that the experimental values fitted well with the predicted ones. 相似文献
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