Abstract:Deep level impurities in the background were found to be vital for the luminescence of QW,grown by solid source Si MBE.The samples grown on undoped and heavily doped substrates,i.e.Sb-doped in QW and B-doped in cap layers were studied.Impurity contamination causes deep levels,which severely reduces radiative efficiency of SiGe/Si QWs.

Abstract:The technology proposed in the image target recognition consists of image segmentation,invariant feature extraction and target classification. In this paper,a knowledge-based approach is proposed for adaptive image segmentation. Invariant features about image targets are extracted by Zernike moments.object classification is completed by the MPNN model.The experimental results show that the proposed system can be used to recognize objects from the complicated background.

Abstract:在１０Ｋ低温下对分子束外延（ＭＢＥ）生长的ＣｄＴｅ（１１１）Ｂ／ＧａＡｓ（１００）／ＣｄＴｅ（２１１）Ｂ／ＧａＡｓ（２１１）Ｂ外延膜进行了光致发光（ＰＬ）测量，得到了ＰＬ谱和带边激子辐射的精细结构．计算得到束缚激子的半峰宽（ＦＷＨＭ）分别为０．２～０．ｓｍｅＶ和１～２ｍｅＶ．实验结果表明外廷膜的质量和生长工艺均良好．

Abstract:采用３个特征频率的声子模型，较好地拟合了ＣｄＴｅ的０￣３０Ｋ反常线膨胀系数ａ和０￣３００Ｋ能隙Ｅｋ的温度关系实验曲线，结果表明ＴＡ声子是导致ＣｄＴｅ低温线膨胀系数反常的原因，能隙随温度的漂移主要受电子－ＴＡ声子相互作用的影响。

Abstract:An optical incoherent shadow-casting system based on programmable LEDs arrays is proposed to implement median filtering of binary images.By time-sequential threshold decomposition,this system can perform median filtering of gray-scale images.The system is compact and convenient in changing the median filtering function and thresholding.

Abstract:在Ｃ６０花生酸复合ＬＢ膜中实现了立体简并四波混频和多重前向光学相位共轭输出，观察到了共轭光输出的累积效应，采用相对测量法测得Ｃ６０ＬＢ膜的Ｘ（３）为（１．８±０．４）×１０－８ｅｓｕ，分析了前向共轭光强与信号光、泵浦光强的关系，最后讨论了非线性效应产生的原因．

Abstract:The knowledge-based system Vision Language,its feature,performance and application are presented

Abstract:The dynamics of the intersubband relaxation of carriers in the InGaAs/GaAs and InGaAs/AIGaAs quantum wells with different well-widths was investigated with the use of time-resolved spectroscopy in the temperature range from 11 to 90K.The different scattering mechanisms,which are dominant in the carriers relaxation processes in the quantum wells of the two systems were discussed.