Desorption and Ripening of Low Density InAs Quantum Dots

In this paper, combining low deposition rate with proper growth temperature, we have developed a way to prepare very low-density quantum dots (QDs) suited for the study of single OD properties without resorting to submicron lithography. Experiment results demonstrate that InAs desorption is significant during growing the low density QDs. Ripening of InAs QDs is clearly observed during the post-growth annealing. Photoluminescence spectroscopy reveals that the emission wavelength of low density InAs QDs arrives at 1332.4 nm with a GaAs capping layer.

Desorption and Ripening of Low Density InAs Quantum Dots

In this paper, combining low deposition rate with proper growth temperature, we have developed a way to prepare very low-density quantum dots (QDs) suited for the study of single OD properties without resorting to submicron lithography. Experiment results demonstrate that InAs desorption is significant during growing the low density QDs. Ripening of InAs QDs is clearly observed during the post-growth annealing. Photoluminescence spectroscopy reveals that the emission wavelength of low density InAs QDs arrives at 1332.4 nm with a GaAs capping layer.

中华猕猴桃果实后熟过程中生理生化变化及氧和二氧化碳的气调效应

本文就中华猕猴桃采收后贮藏与后熟过程中的生理生化变化及O2、CO2的气调效用进行了初步探讨。 结果表明，在贮藏和后熟过程中，中华猕猴桃果实的呼吸强度和乙烯释放存在明显的高峰期，两者同时到达。硬毛变种的呼吸强度与乙烯产率较软毛变种低硬度、Vc、叶绿素随着采后时间的延长逐渐下降，可溶性固形物、蛋白质、chla/chlb则增加。果肉与果心组织中，SOD、MDA及蛋白质存在明显差异，显示了两者生理状态的不同。伴随后熟进程，SOD逐渐下降，脂类过氧化产物丙二醛（MDA）增加，显示了它们在中华猕猴桃的后熟过程中起着重要作用。 3% O2抑制了中华猕猴桃后熟过程中的生理生化变化，如抑制了呼吸和乙烯的上升，硬度的下降及可容性固形物的增加等。低氧保持了猕猴桃果实的良好品质。 20% CO2短期处理，抑制了呼吸作用，但刺激了乙烯的产生，同时加速了果实软化和腐烂的产生，表明中华猕猴桃对高CO2敏感，20%的浓度足可以产生伤害。