The relationships between specific heat of PU rigid foam at low. temperature and such parameters as those of temperature, density and ageing time, etc., have been discussed.
讨论了聚氨酯硬泡沫塑料低温比热与密度、温度以及空气中存放时间等参数的关系。
The results indicated that the asphalt quality and its average molecular weights were increased after ageing of short duration at low temperature.
测试结果表明，低温短期老化时沥青的质量增加，平均分子量增加。
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