Conclusion:Chinese patients after heart valve replacement should use lower initiation dosage,which has equal efficacy and higher safety than higher dosage,especially for female and old patients with biological valve or valve ring replacement.

Radiation vulcanization of natural rubber latex is investigated and the effects of ingredients of NRL, content of n BA , radiation doses and storage time on tensile strength at break of films are discussed.

At low radiation dose of 15-35kGy and high radiation dose of 500kGy, the ILSS of AFRP increases more, but the radiation dose rate has less effect.

By using trimethylolpropane triacrylate(TMPTA) to take the cross-linking agent,EVA(VA content 28%) to take the modifier and Co60γ-ray to take the radiation source,the effects of TMPTA,EVA and irradiation dose on the gel content and the mechanics performance of PVC cable material were studied.

The effect of irradiation doses on flexural strength of AFRC was investigated by means of unidirectional fiber reinforced plastics flexural property test and SEM.

And the modified membranes with different grafting ratio are obtained by changing the conditions,such as solvent,irradiation dose,and irradiation dose rate.

And the modified membranes with different grafting ratio are obtained by changing the conditions,such as solvent,irradiation dose,and irradiation dose rate.

A total dose radiation hardened power VDMOS device is fabricated by growing the thin gate SiO2 after the P-body diffusion and using a double passivation layer (Si3N4-SiO2).

By comparing the MOS structure’s responses to hot-carrier injection and total dose radiation,the correlation between them is investigated.