InP中的Be、P共注入及其退火特性研究

本文对InP中的Be单注入和Be、p共注入及其退火特性进行了比较.SIMS和电化学C-V测试结果表明:采用Be、P共注入可以抑制退火过程中的Be扩散再分布,提高载流子的激活率,改善Pn结的电特性.与单注入相比,共注入样品Be的激活率提高了近一倍.pn结的击穿电压提高,漏电流明显减小.文中对共注入改善退火特性的机理进行了讨论.     

用激光激发从溶液中萃取钯

用激光激发从溶液中萃取钯从溶液中萃取铂族金属的兴趣是由原子能废料中制出这些金属的高出产率决定的。例如，铂族金属的浓度可达４～１９ｋｇ／Ｔ［１］，是天然矿物浓度的数百倍。但是这些惰性金属的传统化学革取法效率不高［１］，并使放射性废料的比例不合理的增大。...     

可用作传感器的表面等离激元共振干涉仪

表面等离子体激元共振是研究薄膜和界面附近介质性质的有效方法[1]，它已成功地用于生物传感器和化学传感器[2]。该法的高灵敏度由金属表面的激光反射参数与该面接触的介质折射率共振关系决定。在这种情况下，通常利用反射束强度最小的角度变化作信息参数‘”由菲涅尔公式可知，金属表面反射率的变化伴随光束反射相位的变化」W。在表面等离激元共振条件下，椭圆测量法记录了类似的相位变化。但是，这种测量的复杂性和实际实验的繁琐性导致灵敏度降低，很难将椭圆测量法用于生物和化学传感系统。作者在文中提出，在表面等离激元共振条件下使…     

激光扫描速度对WC—B4C—SiC—Co熔覆层组织和性能的影响

本文介绍了用大功率ＣＯ２激光束在４５钢表面进行ＷＣ－Ｂ４Ｃ－ＳｉＣ－Ｃｏ激光熔覆处理。对不同扫描速度下熔覆层的显微组织和性能进行了测试分析。结果表明：扫描速度对激光熔覆组织和性能影响比较显著。     

Dynamic Behaviour of Self-Diffraction in Bacteriorhodopsin Film

We investigate the dependences of the diffraction efficiency of the first order self-diffracted beam in bacteriorhodopsin (bR) films on the illumination time, the intensity and wavelength of the incident light. When the blue light (λ = 488 nm) and low intensity red light (λ = 632.8 nm) are incident on the bR film respectively,the diffraction efficiencies increase from zero to a stable value with the illumination time. When the green light (λ = 533 nm) and high-intensity red light illuminate the bR film respectively, the diffraction efficiencies increase from zero to the maximum and then decrease to a stable value with the illumination time. Rise and decay times are dependent on the intensity and wavelength of the incident light. The maximal diffraction efficiency of the red light is twice as high as that of the green light. The highest diffraction efficiency of 5.4% is obtained at 633nm.The diffraction efficiency change with the time for the green light is larger than that for the blue and red light.