TlBaCaCuO外延膜的光响应

在波长γ＝６３２．８ｎｍ，入射功率约０．８ｍ的Ｈｅ－Ｎｅ激光照射下，对ＴｌＢａ２Ｃａ２ＣｕＯ２（Ｔｌ－２２１２）外延膜的光响应行为进行了实验研究。结果显示：在样品转变温度（Ｔｃ＝１０５．５Ｋ）附近，ＴｌＢａ－ＣａＣｕＯ外延膜的光响应行为表现为辐射热与非辐射热效应共存现象。光响应信号电平与样品温度、偏置电流、及入射光束的调制频率等诸因素有密切关系的关系。实验结果还表明，辐射热与非辐射热效应的响应行为     

用时间微分扰动角关联技术表征MO／γ－Al_2O_3加氢脱硫催化剂──Ⅱ．还原态Mo／γ－Al_2O_3催化剂

用时间微分扰动角关联技术表征ＭＯ／γ－Ａｌ＿２Ｏ＿３加氢脱硫催化剂──Ⅱ．还原态Ｍｏ／γ－Ａｌ＿２Ｏ＿３催化剂孙桂大，于延云，鲁琴，焦阳，任立国，阎富山（抚顺石油学院石油化工系，抚顺１１３００１）倪新伯（中国科学院上海原子核研究所，上海２０１８００）...     

基于数学形态学滤波的多刻度法

本文主要讨论了用数学形态学开运算滤波形成二维图形的刻度空间图象,给出了保证开滤波单调性的定理,即当开滤波参数从较细刻度向粗刻度变化时,作为图象特征的过零点数目不增。所得结论不同于Poggio等人关于Gauss滤波器是唯一具有这种单调性的滤波器之结论。此外,开滤波运算的计算量比Gauss滤波要少得多。     

热噪声对约瑟夫森结I-V特性及微波感应台阶的影响研究

采用数值仿真的方法研究了热噪声对约瑟夫森结I-V特性及微波感应台阶的影响。研究表明,热噪声导致约瑟夫森结的I-V特性曲线呈现"圆拱化",也使得微波感应台阶高度减小。得出了取不同约瑟夫森结临界电流和结电阻时,热噪声对台阶的影响规律     

A NEW METHOD OF ADAPTIVE ARRAY PROCESSING FOR SIGNALS OF UNKNOWN CHARACTERISTICS

This paper describes a new method of adaptive array processing for signals of unknown frequencycharacteristics.Under practical circumstances,it is easier to obtain the estimation of the power spec-trum in the observed direction than to obtain that of the frequency characteristics.Thus the maximumentropy spectral analysis can be used to incorporate with the adaptive array processing. In this paper the autocorrelation function is calculated from the power spectrum and the predictedcoefficients of MEM(maximum entropy method)can be obtained by solving the normal equation of thecorrelation matrix,and the predicted coefficients are used as the constrained conditions of the algorithmfor adaptive array processing. The above method is further extended and an adaptive array processor is presented for the moregeneral cases,in which the signal characteristics in the observed direction are completely unknown.Firstly the space filtering of the adaptive array is performed by the all-pass constrained conditions inthe fr     

实空间高分辨象模拟计算中的动态收敛判据

给出实空间多片层(RSMS)法的动态收敛判据(RSMSD法),利用与晶体结构有关的截断条件,动态地确定了每两片层间传播因子的展开级数,完全克服了RSMS法固有的发散问题。RSMSD法的计算结果与快速傅里叶变换多片层(FFTMS)法的相应结果符合很好,这说明动态收敛判据是正确、有效的。 关键词：