Based on an analysis of the waterproof mechanism and cause of durability failure,a time-dependent aging model concerning the contact stress relaxation of waterproof material was developed and accele-(rated) thermal oxidization test on the ethylene-propylene-diene monomer(EPDM) gasket employed in Shanghai Yangtze river tunnel was conducted.

Hygrothermal aging life model of a composite solid propellant;

Protective effect of collagen polypeptides from Apostichopus japonicus on the skin of photoaging-model mice induced by ultraviolet irradiation;

The aging kinetic models in the parameter of n-pentane asphaltene were determined for simply discovering the antiaging property of asphalt added ultraviolet absorption antiaging agent.