The stress relaxation of 8 types of vulcanizates during the atmospheric aging test has been evaluated.

对8种不同类型的硫化橡胶在大气老化试验时的应力松弛变化进行了探讨。

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The research progress of the aeronautical perspex aging is presented including aging properties experimental method and atmospheric aging lifetime.

摘要介绍了航空有机玻璃老化的研究现状，包括老化性能研究、实验方法研究和老化寿命研究。

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The research progress of the aeronautical Perspex aging is presented including aging properties, experimental method, and atmospheric aging lifetime.

介绍了航空有机玻璃老化的研究现状，包括老化性能研究、实验方法研究和老化寿命研究。

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In April, at a conference in New Orleans, he blasted the Hurricane Center's parent agency, the National Oceanic and Atmospheric Administration, NOAA, for not making plans to replace an aging satellite considered vital in tracking hurricanes.

NPR: Hurricane Center Weathers Own Storm