本文按照美国防火标准设计了一种将用于波士顿地铁车辆的地板结构方案,经过对试制的地板测试样件进行加载耐火测试试验,样件在30min内的隔热性、完整性和垂向变形均符合ASTM E 119的规定,证明我们成功研制出一种能够满足美国防火标准的...本文按照美国防火标准设计了一种将用于波士顿地铁车辆的地板结构方案,经过对试制的地板测试样件进行加载耐火测试试验,样件在30min内的隔热性、完整性和垂向变形均符合ASTM E 119的规定,证明我们成功研制出一种能够满足美国防火标准的地铁地板结构,属于国内首次研制成功,表明我国地铁地板结构耐火设计达到了国际水平。本文将设计过程及验证过程中的技术难点和重点进行了总结,以便其他人员参考借鉴。展开更多
The effect of vertical wind shear(VWS)directions on the change in western North Pacific tropical cyclone(TC)intensity is revisited in this study.Results show that the differences in the correlations between VWS in dif...The effect of vertical wind shear(VWS)directions on the change in western North Pacific tropical cyclone(TC)intensity is revisited in this study.Results show that the differences in the correlations between VWS in different orientations and the change in TC nondimensional intensity highly diminish,although slight differences are still present.The subtle differences in the correlations are likely associated with different synoptic-scale patterns at upper and lower levels.This result suggests that,in addition to thermodynamic effects,dynamic roles of the synoptic-scale patterns associated with the VWS should also be taken into account when the authors examine how VWS in different directions affects TC intensity change.展开更多
文摘本文按照美国防火标准设计了一种将用于波士顿地铁车辆的地板结构方案,经过对试制的地板测试样件进行加载耐火测试试验,样件在30min内的隔热性、完整性和垂向变形均符合ASTM E 119的规定,证明我们成功研制出一种能够满足美国防火标准的地铁地板结构,属于国内首次研制成功,表明我国地铁地板结构耐火设计达到了国际水平。本文将设计过程及验证过程中的技术难点和重点进行了总结,以便其他人员参考借鉴。
基金This work was jointly supported by the National Key Research and Development Program of China[grant numbers 2018YFC1507103 and 2017YFC1501601]the Key Program of the Ministry of Science and Technology of China[grant number 2017YFE0107700]National Natural Science Foundation of China[grant numbers 41875054,41730961,41730960,and 41775065].
文摘The effect of vertical wind shear(VWS)directions on the change in western North Pacific tropical cyclone(TC)intensity is revisited in this study.Results show that the differences in the correlations between VWS in different orientations and the change in TC nondimensional intensity highly diminish,although slight differences are still present.The subtle differences in the correlations are likely associated with different synoptic-scale patterns at upper and lower levels.This result suggests that,in addition to thermodynamic effects,dynamic roles of the synoptic-scale patterns associated with the VWS should also be taken into account when the authors examine how VWS in different directions affects TC intensity change.
