The toxicity of asbestos has been constantly an active research topic.Although asbestos has lots of advantages owing to its stable physicochemical properties and economic characteristics,nations enforce policies prohi...The toxicity of asbestos has been constantly an active research topic.Although asbestos has lots of advantages owing to its stable physicochemical properties and economic characteristics,nations enforce policies prohibiting or limiting its use because of its critical impact on human health.Especially in Korea 96% of imported asbestos are slate construction materials and with the influence of Saemaul movement,thatched roofs have been drastically replaced with slate roofs.Efforts to know the distribution characteristics of extensively used asbestos cement slates and to find out the removal method that suits the distribution characteristics are still in an insufficient state.The purpose of this work was to probe into the distribution of asbestos cement slate buildings in Korea and provide basic data of distribution characteristics for policy making in which consideration of the differences between rural and urban regions is necessary based on findings of the studies so far.It is considered helpful in many ways to solving asbestos cement slate related problems in countries where asbestos usage is increasing even after the 2000s including China.展开更多
Roof greening can increase areas of green and improve ecological environment in city.Based on roof greening in low energy demo building of Tsinghua University,This paper analyses the temperature distributed character ...Roof greening can increase areas of green and improve ecological environment in city.Based on roof greening in low energy demo building of Tsinghua University,This paper analyses the temperature distributed character and ecological effect of roof greening.The result show that roof greening can adjust the microclimate.The cool effect of vegetation roof is very distinctness at 12:00 to 16:00.It decrease temperature 4 ℃ and reduce the duration time of high temperature in summer,with seasonal variation,the cool effect is decreased.The temperature distribution in autumn is similar with summer.The preserve heat in winter is not obvious than the cool effect in summer.The mean temperature on vegetation roof is higher than cement roof,and the effect is an accumulative process.The thermal distributions is important to relation of roof greening and environment,it can provide scientific basis for the construction and development of roof greening.展开更多
基金Funded by a grant(12High-tech C20)from High-tech Urban Development Program from by Ministry of Land,Transport and Maritime Affairs of Korea
文摘The toxicity of asbestos has been constantly an active research topic.Although asbestos has lots of advantages owing to its stable physicochemical properties and economic characteristics,nations enforce policies prohibiting or limiting its use because of its critical impact on human health.Especially in Korea 96% of imported asbestos are slate construction materials and with the influence of Saemaul movement,thatched roofs have been drastically replaced with slate roofs.Efforts to know the distribution characteristics of extensively used asbestos cement slates and to find out the removal method that suits the distribution characteristics are still in an insufficient state.The purpose of this work was to probe into the distribution of asbestos cement slate buildings in Korea and provide basic data of distribution characteristics for policy making in which consideration of the differences between rural and urban regions is necessary based on findings of the studies so far.It is considered helpful in many ways to solving asbestos cement slate related problems in countries where asbestos usage is increasing even after the 2000s including China.
文摘Roof greening can increase areas of green and improve ecological environment in city.Based on roof greening in low energy demo building of Tsinghua University,This paper analyses the temperature distributed character and ecological effect of roof greening.The result show that roof greening can adjust the microclimate.The cool effect of vegetation roof is very distinctness at 12:00 to 16:00.It decrease temperature 4 ℃ and reduce the duration time of high temperature in summer,with seasonal variation,the cool effect is decreased.The temperature distribution in autumn is similar with summer.The preserve heat in winter is not obvious than the cool effect in summer.The mean temperature on vegetation roof is higher than cement roof,and the effect is an accumulative process.The thermal distributions is important to relation of roof greening and environment,it can provide scientific basis for the construction and development of roof greening.
