强CO_2激光退火时离子注入Si的光学性质

本文测量了砷离子(As~+)注入的Si在连续CO_2激光辐照下光的椭圆偏振参数、反射率、表面薄层电阻率随时间的变化。从(?)、△、R、ρ的变化看出Si注入层的激光退火是在一定的时间、温度条件下迅速完成的。     

Photoluminescence of silicone oil treated by fluorocarbon plasma

We investigated photoluminescence characteristics of silicone oils treated by C2F6 and CHF3 plasma. The silicone oil treated by the C2F6 plasma emitted a white light mainly composed of 415 nm, 469 nm, and 554 nm emissions, while that treated by the CHF3 plasma emitted a pink light (415 nm). Fourier transformed infrared spectroscopy and Raman spectroscopy studies showed that the photoluminescence was correlated with the Si-C bond, the carbon-related defects and the oxygen vacancies. It was suggested that the light emitting at 554 nm was related to the Si-C bond and the carbon-related defects, while the pink emission at 415 nm was related to the oxygen vacancies.     

弯曲对大血管流动的影响

以主动脉弓血液流动为原型,在D300,Re500的条件下,用二维LDA测量了U型和S型圆截面弯曲流道内流动的速度分布。流动介质经配制Δn<10~(-3)。实验结果表明:1.现有弯管流动理论不适用于象主动脉弓血流那样的高Dean数流动;2.当Dean数不高时,流动分离属异常分离;当Dean数较高时,二次流流型复杂,但未观测到回流现象,多为正常分离;3.用高剪应力或低剪应力来解释动脉粥样硬化病理过程的流体动力学影响似嫌过于简单化。二次流型、壁面剪应力随位置的急剧变化等流体动力因素对于血管内皮细胞的作用可能具有重要意义。