重庆颗粒物自然沉降分布与其显微镜下的物理特征

本文研究了重庆颗粒物自然沉降的分布规律;揭示了市区、郊区颗粒物在显微镜下的物理特征,为研究颗粒物对建筑物体的腐蚀提供了有力的依据。     

Comparison of some atmospheric chemical modeling schemes

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The traffic emission and its impact on air quality in Guangzhou area

A comprehensive field measurement was set up in Guangzhou City of China and the key was placed on NO_x and O₃ pollution. The results indicated that the average driving speed of vehicle was only 14 km/h in downtown with high frequency of idle and acceleration. Upward fluxes of CO and NO were observed in Dongfeng street. NO_x annual mean concentration in urban area increased year by year, and NO_x was identified as the most important pollutant since 1995. Photochemical smog pollution was serious in general,spatial and seasonal distribution of O₃ was observed. O₃ concentration was kept in a high level in autumn, and its formation was restrained in summer due to frequent thunderstorm and high humidity. The numerical simulation showed the average concentration and maximum concentration of O₃ would increase 60%—100% if vehicular emission increased 100% in Guangzhou.     

燃煤烟气中多环芳烃(PAHs)光化学降解的研究

研究了各种条件下，燃煤烟气中多环芳烃（PAHs）的光化学降解。实验结果表明，采用模拟日光中紫外部分的荧光灯照射，PAHs光解率随光照强度、照射时间、温度和水蒸气含量的增加而增大。由此推断，在夏季高温、潮湿和高日照条件下，PAHs一般在数小时内即全部降解。而在冬季低温、干燥和低日照的气候条件下，PAHs降解速率很小，可在大气中停留较长时间，扩散到较远距离。还提出了由烟气中水蒸气产生的气态OH自由基以及未燃尽烃类自由基与激发态PAHs碰撞导致发生PAHs污染物光化学降解的反应机理。     

Photochemical reaction of particle-bound 1-nitropyrene under simulated atmospheric condition

Photoreaction of particle-bound 1-nitropyrehe (1-NP) under simulated atmospheric condition has been studied. When 1-NP coated on the surface of silica gel was suspended in a stream of nitrogen, oxygen or air, respectively, and exposed to intensive light of xenon lamp, photochemical reaction took place. The result of kinetic study showed it to be of the second order. The photoreaction products were identified by off-line HPLC/MS as 1,6-pyrenequinone, 1,8-pyrenequinone, trinitro-hydroxypyrene, dinitrohydroxypyrene, 6,6'- dipyrenenone, etc. The mutagenicity of photochemical reaction products is higher in oxygen and air, and lower in nitrogen than that of the precursor 1-NP, as detected by the Ames Bioassay.     

挤压变形对MB15镁合金及组织性能的影响

对MB15镁合金进行热处理,然后进行挤压试验,挤压变形MB15镁合金组织以剪切条纹和细小的α再结晶等轴晶为基本特征。挤压变形可显著地细化镁合金晶粒并提高镁合金的力学性能。随挤压比的增大,晶粒细化程度增加;强度、硬度随挤压比的增大而增大。所制定的工艺合理,挤压出的管材、型材有较好的力学性能。     

钢铁厂铁鳞、铁红基本物性及还原性研究

对钢铁厂铁鳞、铁红的基本物化性能和还原性能进行了研究。结果表明：粒度较粗、全铁较高铁鳞的还原性较好，适于作为优质海绵铁的原料。粒度极细、全铁高且杂质含量很低的铁红还原性也较好，适于作还原铁粉生产的原料。     

MTO/FCC反应器高温高压设备隔热衬里对金属壳体温度分布的影响

MTO/FCC反应器高温高压设备的隔热衬里发生局部开裂或破碎时,该部分衬里将保持全部或部分隔热功能。以衬里的破坏厚度和破坏高度作为控制变量,研究衬里破坏程度对衬里-金属结构温度分布的影响。结果表明:设计温度为750℃时,随着衬里破坏厚度和破坏高度的增加,衬里-金属结构温度逐渐升高,且存在温度上限;当衬里设备存在"施工缝"缺陷时,随着衬里破坏厚度的增加,衬里-金属结构的温度增高,最大温度为546℃;当衬里破坏厚度超过80%时,金属壳体最高温度为346℃,验证了国外手册中衬里破坏决策书选取350℃为极限温度条件的科学性和适用性。     

细粒酒精模型冰力学性能综合评述

简要介绍现行几种模型冰质量评价指标。对细粒精模型冰的特征进行了归纳和分析。阐明细粒酒精模型冰历史资源的可靠性，从模型冰变形模量与弯曲强度的关系和压缩强度民弯曲强度的关系，以及其它物理和力学数入手，综合评价了细粒酒精模型冰的质量。     

Estimation of primary drainage three-phase relative permeability for organic liquid transport in the vadose zone

The modeling of transport of organic liquid contaminants through the vadose zone often requires three-phase relative permeabilities. Since these are difficult to measure, predictive models are usually used. The objective of this study is to assess the ability of eight common models to predict the drainage relative permeability to oil in a three-phase system (water-oil-air). A comparison of the models' estimates using data set from Oak [Oak, M.J., 1990. Three-phase relative permeability of water-wet Berea. In: Seventh Symposium on Enhanced Oil Recovery, Paper SPE/Doe 20183. Tulsa, OK, April 22-25] showed that they provide very different predictions for the same system. The goodness of the models does not increase with the amount of data or computation that the models require. Also, the calculations showed how different interpretations of the models and of the terminology associated with them can significantly impact the predictions. Thus, considerable error may be introduced into the simulations of organic liquid transport in the vadose zone depending on the selection and interpretation of the three-phase relative permeability model.