单跨悬索桥的动力分析

以重庆鱼嘴长江特大桥为研究对象，建立了空间有限元模型，进行了成桥阶段的特征值分析、动力荷载时程分析及地震反应分析，研究了车速对桥梁动力反应的影响。     

大底盘多塔楼结构地震反应

本文采用多串集中质量模型对大底盘单塔楼及多塔楼结构进行了弹性和弹塑性时程分析。在单塔楼结构中，考虑了底盘刚度、高度及承载力对结构地震反应的影响。在多塔结构中，研究了多塔的相互影响，比较了单塔及多塔的地震反应。在大量分析及比较的基础上，对大底盘结构的地震反应有进一步认识，并作了一些概念设计建议。     

非理想性对BZ反应振荡时间影响的研究

本文基于Ｄｅｂｙｅ－Ｈｕｃｋｅｌ强电解质理论，反应活化络合物理论，及三变量微分方程奇点理论，以可逆Ｏｒｅｇｏｎａｔｏｒ为模型研究了非理想性对封闭系ＢＺ反应诱导期，振荡时间及整个过程的持续时间的影响，离子强度增加各时间相应增长。同时进行了实验研究，得到了与理论分析一致的结论。     

常温厌氧接触法处理啤酒废水的试验研究

介绍了啤酒生产的特点及啤酒废水的成分，常温厌氧接触法对啤酒废水进行净化研究的试验方法和处理流程。试验结果表明，温度对厌氧反应有显著影响，厌氧反应对ＣＯＤ的去除效果较好，能产生沼气，反应后的ＰＨ略有提高。     

碱—熟料—矿渣水泥混凝土的碱集料反应研究

采用砂浆测长法研究了碱－熟料－矿渣水泥砂浆的碱集料反应膨胀率；分析了碱组分种类及熟料掺量等因素对该类砂浆碱集料反应膨胀率的影响；综合砂浆测长结果及ＳＥＭ分析，探讨了碱－熟料矿渣水泥系统碱集料反应的特性。     

空间桁架非线性动力反应及例塌分析

本文对空间杵架线性及非线性动力反应进行了研究。通过Ｎｅｗｍａｒｋ数值积分稳定性的推导，结合结构的倒塌机理，提出了判定结构动力倒塌的双重判定准则，分析了北京机场机库结构弹性的弹塑性的地震反应，以及结构在强震下倒塌的全过程。     

有机硅氧烷改性苯丙乳液涂料

在苯乙烯-丙烯酸乳液聚合过程中，加入一定量的有机硅氧烷进行共聚，制得建筑涂料。研究了反应温度、时间、乳化剂用量等因素对反应进程，乳液的稳定性及涂料性能的影响。     

碱集料反应研究的新进展

着重介绍了近年来碱集料反应（alkali-aggregate reaction,AAR）研究的一些最新成就，包括集料中碱的析出、碱集料反应的分类、集料活性的鉴定方法、湿度的影响及碱碳酸盐反应（alkali-carbonate reaction,ACR）。由于在世界各地发生AAR的事例增多，对工程的耐久性影响巨大，因而近年来又重新引起重视，甚至在研究最多、最早的美国，现在也已重新开始了研究，此处所述内容希望对重大工程的决策能有参考价值。     

高强砼聚合物增韧研究

本文作者在制备聚丙烯酸盐凝胶及对其性质进行研究的基础上，通过聚合物反应对砼的凝结时间，强度及韧性等进行了系列试验，得到了合理的聚合物及引发剂掺量，以及丙烯酸盐中金属离子的作用，研究了聚丙烯酸盐对高强砼的增韧效果。     

盒式房屋层间摩擦隔震体系地震反应的过程分析

在建立模型和理论研究的基础上，通过计算机程序编制，应用典型工程实例，进行了地震反应的动力时程计算，并分析了这种减震体系的动力反应特点和规律，得出了具有实际工程意义的结论和建议，从理论分析方面为进一步改进，完善及推广该结构体系提供了依据。     

SiO_2/TiO_2复合膜光催化降解胶片废水的研究

以煤矸石烧结滤料为载体,以SiO2/TiO2复合膜为催化剂,在自制的紫外光光催化反应器中,以去除胶片废水的色度为研究目标,考察了废水色度、pH、曝气/光照对SiO2/TiO2复合膜光催化活性的影响.结果表明,当废水的初始吸光度为0.554、光催化降解的时间为2 h时.SiO2/TiO2复合膜光催化降解胶片废水的脱色率可达到99.4%;脱色率与光照时间呈线性相关(R2=0.994 2),且可用Langmuir-Hinshelwood一级动力学模型进行拟合,表观速率常数为0.027 5min-1;SiO2/TiO2复合膜光催化降解胶片废水的处理费用约为1.2元/m3,较接触氧化工艺的处理成本低,有一定的工程应用价值.     

Treatment of textile dyehouse wastewater by TiO2 photocatalysis

The oxidative degradation of an actual textile dyehouse wastewater was investigated by means of photocatalysis in the presence of TiO2. The UV-A-induced photocatalytic oxidation over TiO2 suspensions was capable of decolorizing the effluent completely, as well as reducing chemical oxygen demand (COD) sufficiently (COD reduction generally varied between about 40% and 90% depending on the operating conditions) after 4 h of treatment. Two crystalline forms of TiO2, viz. anatase and rutile, were tested for their photocatalytic activity and anatase was found to be more active than rutile. The extent of photocatalytic degradation was found to increase with increasing TiO2 concentration up to 0.5 g/L TiO2, above which degradation remained practically constant, reaching a plateau. Furthermore, textile effluent degradation was enhanced at acidic conditions (i.e. pH = 3) and in the presence of hydrogen peroxide. To assess catalyst activity on repeated use, experiments were performed where the catalyst was recovered and reused; after three successive uses, TiO2 had sufficiently retained its photocatalytic activity. Finally, the luminescent marine bacteria Vibrio fischeri was used to assess the acute ecotoxicity of samples prior to and after the photocatalytic treatment and it was found that ecotoxicity was fully eliminated following photocatalytic oxidation.     

Photocatalytic degradation of Reactive Red 22 in aqueous solution by UV-LED radiation

Photocatalytic processes using TiO(2) as a catalyst have attracted extensive attention for decomposition of organic contaminants. The determination of optimum reactor design and operational conditions are the major concerns for the development and potential application of the photocatalytic process. Various photoreactor types, photocatalyst arrangements, light sources, and operation conditions were reported. This study was focused on the application of the ultraviolet light emitting diode (UV-LED) as the UV light source for the photocatalytic decomposition of Reactive Red 22 (RR 22). The temporal behavior of the photocatalytic decomposition of RR 22 in aqueous solution by the UV-LED/TiO(2) with a rectangular planar fixed-film reactor operated in a recirculation mode was studied under various conditions including initial dye concentration, periodic illumination, light intensity, and arrangements of TiO(2) coating. The decomposition of RR 22 in aqueous solution by TiO(2) photocatalytic processes with the UV-LED was found to be technically feasible with a high TiO(2) coated weight (1.135g) and low pH value (pH 2). A Langmuir-Hinshelwood-type kinetic equation was adequate for modeling the photocatalytic decomposition of RR 22 by the UV-LED/TiO(2) photocatalytic processes. The experimental results indicated that the photonic efficiency with periodic illumination was much higher than those with continuous illumination. The photonic efficiencies with the quartz-liquid-catalyst (QLC) arrangement were higher than those with the quartz-catalyst-liquid (QCL) arrangement for experiments conducted at lower applied light intensity; however, the photonic efficiencies for these two arrangements were nearly identical for experiments conducted at higher light intensities.     

光催化混凝土物理力学性能研究

光催化混凝土是将光催化技术应用于混凝土中,通过光照等自然条件发生光催化反应,开发出环境友好的混凝土材料,改善空气质量和生活环境。选取不同掺量的纳米TiO2,设计平行试验制备光催化混凝土并对其各方面性能进行测试分析。结果表明,随着纳米TiO2掺量的增加,光催化混凝土的吸水率下降,软化系数提高,7、28 d抗压强度以及不同时段的光催化性能都先升高后降低;一定量硅藻土的掺入对于光催化混凝土的物理力学性能具有积极的影响。     

净化空气多功能内墙涂料的制备及其性质研究

加入纳米TiO2作为光催化粉体,对传统建筑内墙涂料进行改性,使之具有较强的净化空气、杀菌抑菌的功能。从分散剂用量的确定、纳米TiO2用量的确定、PVC的确定三个方面来提高涂料本身的性能。对其光催化氧化降解甲醛进行了初步测试表明,对室内有害气体污染有较大的改善作用。     

纳米TiO2-AC负载膜光催化降解偶氮染料

以钛酸四丁酯和活性炭为主要原料，采用溶胶-凝胶-浸渍法制备纳米TiO2-AC负载膜催化剂，并借助流化床反应器分别对两种典型的偶氮类染料橙黄C、活性艳红X-3B模拟废水进行了UV光降解、暗态吸附及光催化降解研究，探讨了pH值、外加氧化剂对光催化去除率的影响，同时对催化剂进行回收再生利用试验。结果表明：纳米TiO2-AC负载膜具有很好的光催化活性、吸附特性及可再生性，两种染料1h的光催化降解率最高分别可达99．71％和97．12％。反应过程中固、液、气三相能够有效分离，实现了反应与分离的一体化。     

Photocatalytic degradation of Acid Red 4 using a titanium dioxide membrane supported on a porous ceramic tube

A photocatalytic membrane supported on a porous ceramic tube was described, in which permeation of solutes through the membrane and tube and photocatalytic reaction occur simultaneously. In this photocatalytic membrane reactor, TiO(2) catalyst was coated on the surface of a porous ceramic tube and all experiments were conducted in one pass dead-end system. The objectives of this study are to demonstrate the predominance of dead-end operation and to determine the reaction kinetics model of the photocatalytic reaction. Acid Red 4 (AR 4) dye was used as a model pollutant. A detailed study of physical parameters including flow configurations (dead-end and cross-flow), flow rate, initial dye concentration, light intensity and catalyst loading has been performed to obtain the reaction kinetics. The simultaneous effect of light intensity and catalyst loading was also determined experimentally. Experiments were also conducted to compare the photocatalytic degradation of AR 4 in the dead-end and cross-flow system. The major findings of this study are: (1) the decomposition ratios for dead-end system were three and five times higher than cross-flow system at flow rates of 6.67x10(-8) and 4.00x10(-7)m(3)/s, respectively. (2) The decomposition ratio increased with increasing catalyst loading and light intensity, but remained constant at higher catalyst loading. (3) The decomposition ratio was found to be decreased with increasing flow rate.     

纳米TiO2-ACF光催化净化室内空气污染物试验

本文提出了纳米TiO2-ACF复合光催化净化室内空气技术,分析了不同条件下复合光催化净化网的净化效率,对ACF吸附网、纳米TiO2光催化净化网和纳米TiO2-ACF复合光催化净化网净化甲醛的净化性能进行了对比分析.复合光催化净化网在高风速且污染物质量浓度较低时净化效率高于其他两种净化网的净化效率近15%.该净化网对无机和有机污染物具有较强的吸附氧化能力、较小的空气阻力、无中间副产物生成,实现了ACF的原位再生,延长了净化网的使用周期.     

Visible-light-induced photocatalysis of low-level methyl-tertiary butyl ether (MTBE) and trichloroethylene (TCE) using element-doped titanium dioxide

While the photocatalytic degradation of various volatile organic compounds in conjunction with UV light has been widely reported, visible-light-induced photocatalytic degradation of low-levels of the pollutants MTBE and TCE, which have been linked to potential adverse health effects, is rarely reported. The present study examined whether visible-light-activated S- or N-doped TiO₂ photocatalytic technology can be used to control indoor concentrations of MTBE and TCE. This study consists of the characterization of the doped TiO₂ powders, as well as an investigation of their photocatalytic activities. In regards to both powders, a shift of the absorbance spectrum towards the visible light region was observed. An activity test suggested that these photocatalysts exhibited reasonably high degradation efficiencies towards MTBE and TCE under visible light irradiation. The degradation efficiencies of MTBE and TCE by S- and N-doped photocatalysts exceeded 75 and 80%, respectively, at input concentrations (IC) of 0.1 ppm. Degradation efficiency was dependent on both IC and relative humidity. TCE could enhance the degradation efficiency of MTBE even under visible-light irradiation. The estimated mineralization efficiencies (MEs) were comparable to those of previous studies conducted with UV/TiO₂ systems. Similar to the relative degradation efficiencies, the ME of TCE was higher in comparison to that of MTBE. The CO production measured during the photocatalytic processes represented a negligible addition to indoor CO levels. These results suggest that visible-light-activated S- and N-doped TiO₂ photocatalysts may prove a useful tool in the effort to improve indoor air quality.     

The effect of activated carbon adsorption on the photocatalytic removal of formaldehyde

Photocatalysis is an emerging and promising technology for indoor air purification. This photocatalytic method is effective in the case of a higher pollutant concentration, but its wide application in indoor air purification is limited due to the low level of indoor air contaminants. In order to improve the removal of pollutants in indoor air, we evaluated the photocatalytic performance over the nanosized TiO₂ particles immobilized on the surface of activated carbon (AC) filter for the removal of formaldehyde (HCHO). It is shown that the photocatalytic reaction rate increased because the AC could adsorb the pollutants from the diluted air stream to generate a high concentration of the pollutants on the catalyst surfaces. The photocatalytic reaction took place from the diffusion control process to the photocatalytic reaction control process with the rise in flow velocity. In the former process, the photocatalytic reaction rate increased, whereas in the later process photocatalytic reaction rate changed little with increasing flow velocity. The flow velocity was lower over the TiO₂/AC catalyst than over the TiO₂/glass catalyst when the photocatalytic reaction was switched from the diffusion control process to the photocatalytic reaction control process. It is also observed that the indoor low-concentration HCHO could be photocatalytically degraded over TiO₂/AC, with the HCHO concentration in the product mixture falling into the standard range that is specified by the indoor air quality standard of China.