The evolution of void nucleation inα-A12O3 irradiated by En ≥ 1 MeV neutrons of 3× 1020 cm-2 and post-annealed from 100°C to 1050°C is studied by a positron annihilation lifetime technique. The void n...The evolution of void nucleation inα-A12O3 irradiated by En ≥ 1 MeV neutrons of 3× 1020 cm-2 and post-annealed from 100°C to 1050°C is studied by a positron annihilation lifetime technique. The void nucleation starts at 500℃. The radius of created voids is 0.31 urn and the number of voids increases with increasing annealing temperature from 550℃ to 750℃. Afterwards, the radius of voids increases rapidly and reaches 1.21nm at 1050℃.展开更多
BACKGROUND: The purpose of this study is to clarify the latest long-term therapeutic result for cranial base chordomas.We are seeking an improvement of long term therapeutic outcome through a review of cranial base ch...BACKGROUND: The purpose of this study is to clarify the latest long-term therapeutic result for cranial base chordomas.We are seeking an improvement of long term therapeutic outcome through a review of cranial base chordomas treated in展开更多
基金the National Natural Science Foundation (No.19835050) and Nuclear industryScience Foundation (No.H7196BOll6)
文摘The evolution of void nucleation inα-A12O3 irradiated by En ≥ 1 MeV neutrons of 3× 1020 cm-2 and post-annealed from 100°C to 1050°C is studied by a positron annihilation lifetime technique. The void nucleation starts at 500℃. The radius of created voids is 0.31 urn and the number of voids increases with increasing annealing temperature from 550℃ to 750℃. Afterwards, the radius of voids increases rapidly and reaches 1.21nm at 1050℃.
文摘BACKGROUND: The purpose of this study is to clarify the latest long-term therapeutic result for cranial base chordomas.We are seeking an improvement of long term therapeutic outcome through a review of cranial base chordomas treated in
