预应力新工艺——悬浮法张拉在施工中的应用

通过对景德镇市昌江支线I桥系杆张拉中所采用的张拉新工艺一悬浮法，介绍了悬浮法张拉的基本原理、施工要点、注意事项，同时对比普通张拉法与悬浮法张拉的优缺点，得出了悬浮法张拉优于普通法张拉的结论。     

建筑密封材料室外曝晒试验与耐久性

列述了４年中室外曝晒试验及其结果，具体评价了８种建筑密封材料的耐久性。     

地下高空大承载力模板支撑系统设计若干要点分析

在目前我国大中型水利水电地下工程施工技术应用中,普通现浇结构混凝土承重模板支撑系统的施工设计技术理论已经相当成熟,但对于混凝土厚度1.5m以上、高度和跨度均大于15m的结构混凝土承重模板支撑系统的施工设计却几乎没有非常适用的技术理论可以参考,因此,对于大中型水利水电工程施工及验收造成了极大的不便。本文结合工程实践,对高大厚重结构承重模板支撑系统设计从方案比选、结构组合、结构计算等几个方面进行了系统的总结或论述。     

Thermal radiative protection of fire fighters' protective clothing

A method for measuring the thermal radiative protection of actual fire fighters' garments to an incident radiative heat flux of 8.4 kW/m² is described. Typical results obtained with several conventional and prototype garments are presented. These results indicate the time to pain, and second degree burn as well as the pain alarm time. The thermal inertia of the garments is also measured based upon burn exposure time. Differences in physical properties such as garment thickness, total weight and number of layers are examined in order to establish the existence of any correlations.Issued as NRCC 26171. Reference: M. Day and P. Z. Sturgeon, Thermal Radiative Protection of Fire Fighters' Protective Clothing,Fire Technology, Vol. 23, No. 1, February 1987, p. 49.     

中国现代新兴工业城市规划的历史研究——以苏联援助的156项重点工程为中心

从1950年代中国围绕苏联援助的156项重点工程进行的工业建设选址布局入手,研究了新兴工业城市的发展目标、类型与建设发展模式,剖析了新兴工业城市规划的类型与内容,阐述了新兴工业城市规划的本质、作用及其历史地位.     

含水率变化下压实路基土动态回弹模量试验研究与预估模型

路基土动态回弹模量MR是路面设计和使用性能评价采用的关键参数,运营期间受含水率变化影响显著。以压实红黏土为研究对象,制备了6个不同含水率和3种不同压实度的试样,采用滤纸法测试了不同状态下的基质吸力,并通过动三轴试验研究了含水率、压实度、动偏应力和围压对动态回弹模量的影响。试验结果表明:MR随压实度、围压的增大而增大,随动偏应力增大呈非线性减小;MR随含水率增大急剧降低,从最佳含水率增加4.5%时,不同压实度下MR均降低约50%,动偏应力和压实度对MR的影响随含水率增大逐渐减弱;MR随含水率和饱和度的变化规律与土性显著相关,而不同土样的MR随基质吸力变化趋势基本一致。进而引入基质吸力,建立了综合考虑含水率和应力水平影响的压实路基土MR预估模型,通过本文和文献试验数据证实了该模型的适用性,并基于13种土样的试验结果建立了模型参数与物性指标之间的经验关系。     

Patterns and predictors of personal exposure to indoor air pollution from biomass combustion among women and children in rural China

Indoor air pollution (IAP) from domestic biomass combustion is an important health risk factor, yet direct measurements of personal IAP exposure are scarce. We measured 24-h integrated gravimetric exposure to particles < 2.5 μm in aerodynamic diameter (particulate matter, PM?.?) in 280 adult women and 240 children in rural Yunnan, China. We also measured indoor PM?.? concentrations in a random sample of 44 kitchens. The geometric mean winter PM?.? exposure among adult women was twice that of summer exposure [117 μg/m3 (95% CI: 107, 128) vs. 55 μg/m3 (95% CI: 49, 62)]. Children's geometric mean exposure in summer was 53 μg/m3 (95% CI: 46, 61). Indoor PM?.? concentrations were moderately correlated with women's personal exposure (r=0.58), but not for children. Ventilation during cooking, cookstove maintenance, and kitchen structure were significant predictors of personal PM?.? exposure among women primarily cooking with biomass. These findings can be used to develop exposure assessment models for future epidemiologic research and inform interventions and policies aimed at reducing IAP exposure. PRACTICAL IMPLICATIONS: Our results suggest that reducing overall PM pollution exposure in this population may be best achieved by reducing winter exposure. Behavioral interventions such as increasing ventilation during cooking or encouraging stove cleaning and maintenance may help achieve these reductions.     

长沙市住宅建筑室内外VOC浓度的实测与分析

根据10户住宅建筑的VOC浓度现场测试及问卷调查结果，分析了长沙市住宅室内外VOC浓度及个人暴露量的状况。分析了环境温湿度、住宅装修时间、空调气流组织方式等对住宅VOC散发及分布的影响。     

用弹性板理论分析采场覆岩中的关键层

以岩层控制中的关键层理论为指导，应用弹性板理论建立了关键层的刚度条件和强度条件。结果表明，用板理论分析的结果与梁理论推导的结果具有相同的表达形式。最后，用实例证明了覆岩关键层的存在及对地表下沉的影响。     

浅谈耐腐蚀混凝土的机理及施工技术措施

介绍了混凝土结构的腐蚀机理,提出了混凝土结构的腐蚀预防措施,阐述了耐腐蚀混凝土配合比的设计要点和施工要点,以确保施工质量,提高建筑物的耐久性。