单组分聚氨酯防水涂料的研制

介绍了单组分湿固化型聚氨酯防水涂料的反应机理；报道了研制成果：分析了各组分和添加剂以及工艺条件对产品性能的影响：并得出结论：选择合适比例的混合聚醚多元醇与二甲苯基二异氰酸酯，精选各种填料和助剂，在适宜的反应条件下，可以制备出符合国家标准的单组分湿固化型聚氨酯防水涂料。     

Toxic metals in the atmosphere in Lahore, Pakistan

Aerosol mass (PM₁₀ and PM_2.5) and detailed elemental composition were measured in monthly composites during the calendar year of 2007 at a site in Lahore, Pakistan. Elemental analysis revealed extremely high concentrations of Pb (4.4 μg m^− 3), Zn (12 μg m^− 3), Cd (0.077 μg m^− 3), and several other toxic metals. A significant fraction of the concentration of Pb (84%), Zn (98%), and Cd (90%) was contained in the fine particulate fraction (PM_2.5 and smaller); in addition, Zn and Cd were largely (≥ 60%) water soluble. The 2007 annual average PM₁₀ mass concentration was 340 μg m^− 3, which is well above the WHO guideline of 20 μg m^− 3. Dust sources were found to contribute on average (maximum) 41% (70%) of PM₁₀ mass and 14% (29%) of PM_2.5 mass on a monthly basis. Seasonally, concentrations were found to be lowest during the monsoon season (July-September). Principle component analysis identified seven factors, which combined explained 91% of the variance of the measured components of PM₁₀. These factors included three industrial sources, re-suspended soil, mobile sources, and two regional secondary aerosol sources likely from coal and/or biomass burning. The majority of the Pb was found to be associated with one industrial source, along with a number of other toxic metals including As and Cr. Cadmium, another toxic metal, was found at concentrations 16 times higher than the maximum exposure level recommended by the World Health Organization, and was concentrated in one industrial source that was also associated with Zn. These results highlight the importance of focusing control strategies not only on reducing PM mass concentration, but also on the reduction of toxic components of the PM as well, to most effectively protect human health and the environment.     

空调使用费构成及影响因素分析

介绍了空调使用费的构成和计算原则，给出了计算实例。认为空调使用费应分固定费用和变动费用计取。对影响空调使用费的关键因素制冷站能耗系数、当量满负荷运行小时数、初投资、系统容量等进行了分析，指出了降低空调使用费的途径。     

大气吸收系数的研究与应用

定义了大气吸收系数的概念．通过试验及理论分析．得出我国各地区大气吸收系数推荐值，并时体育场场地照明照皮计算进行修正。     

我国混凝土结构吊装工程技术的新进展——新版《建筑施工手册》第21章内容精选

随着我国工程建设的迅猛发展 ,10余年来 ,我国混凝土结构吊装在起重机械、吊装工艺等方面有了很大发展 ,新编《建筑施工手册》对这些内容进行了重点介绍。     

高强轻集料混凝土组成与性能的试验研究

本文选用三种高强陶粒为粗骨料，在不同水胶比和掺合料下，通过进行系统地配制试验，探讨陶粒混凝土性能与组成的关系。结果表明：陶粒混凝土强度与胶水比在一定的胶水比范围内存在着线性关系，但范围随陶粒种类不同而不同，陶粒的特性(密度、粒型等)是影响混凝土性能的重要因素。     

外包碳纤维约束混凝土刚性元件

利用外包碳纤维约束混凝土柱加卸载曲线的特点 ,得到了刚度与极限压应变均较大的刚性元件 ,并用该刚性元件测得了完整的混凝土应力 -应变全过程曲线 ,证实了此种刚元件是一种新型的较好的刚性元件。     

楼地面沿板缝方向裂缝的原因分析及预防措施

详细分析了楼地面沿板缝方向产生纵向裂缝的原因,从重视和提高嵌缝质量、选择合理的板侧构造形式、清洗板面、加强楼板构件的质量管理等方面提出了纵向裂缝的防治措施,以保证楼地面的正常安全使用。     

智能化剪力墙设计软件的研究

论述了智能化剪力墙软件发展的必要性,并对剪力墙设计的内容、难题和涉及的相关规范以及设计过程及特点进行剖析、研究,提出了实现智能化剪力墙设计软件中要解决的关键问题及解决方法。     

Contribution of marine and continental aerosols to the content of major ions in the precipitation of the central Mediterranean

The region of the investigated receptor is situated in the southern part of the Adriatic Sea in the Mediterranean. The measuring station is located on the seashore, which, being considered as a border area, is representative for the qualitative and quantitative estimation of the influence of marine and continental aerosols on the content of major ions in precipitation. In the sampling period, precipitation in the region of the investigated receptor was more abundant during the summer and autumn than during the winter and spring. The most frequent precipitation heights were up to 20 mm, while high precipitation came exclusively from the continental region. The results of the measurements of ions readily soluble in water were used for the differentiation of marine from continental contributions of primary and secondary aerosols to their content in the precipitation. Using PCA, it was shown that main contribution of Cl(-), Na(+) and Mg(2+) came from primary marine aerosols, while the contribution from continental sources was dominant for the content of SO(4)(2-), NO(3)(-), NH(4)(+) and Ca(2+) in the precipitation. The continental origin of Ca(2+) was from a primary source, while SO(4)(2-), NO(3)(-) and NH(4)(+) were representatives of secondary aerosols produced by reactions between acid oxides and alkaline species in the atmosphere, but SO(4)(2-) and NO(3)(-) also exist in the precipitation as free acids. The origin of the trace elements Cd, Cu, Pb and Zn in the precipitation came from anthropogenic emission sources. The results obtained in this work are based on experimental data from 609 samples collected during the period 1995-2000.