一维点阵的电子态

本文利用A、B构成序列有不同排列方式,模拟出晶体、孪晶、准晶和无序的一维结构。应用紧束缚模型,对各结构的电子态进行计算研究,系统地分析比较了各序列的电子能谱、态密度、局域度以及波函数图象,得出准晶体结构是一种新的结构,其电子态不同于晶体、孪晶及无序体的电子态等结论。     

掺杂晶体表面顶位、桥位和心位化学吸附的研究

本文用Green函数方法研究了不同类型的杂质对简立方晶体(SCC)(100)面顶位、桥位和心位化学吸附的影响。并讨论了分裂态的产生与吸附位置。杂质(△ε)以及吸附原子和衬底之间的相互作用势(v)之间的关系。     

SU(1,1)群BG相干态的叠加态

本文研究了SU(1,1)李群Barut—Girardell(BG)相干态的叠加态的非经典性质与叠加系数之间的关系。发现在一般情况下叠加态仅出现压缩性或反聚束性,但叠加系数取值在某个特定范围内时,可同时出现压缩性及反聚束性。     

An improved Cass-Koopmans model with endogenous fertility under the CES production technology

Under the CES production technology, an improved Cass-Coopmans model with solvable endogenous fertility is given. We prove that there are multiple growth paths and multiple steady states when CES 0<δ<1 and the technology level is high enough; the growth path and the steady state is unique when δ>1 and the ratio of capital is smaller than a constant. So, the dynamic system which describes the model undergoes a bifurcation when δ=1 We discuss the economic sense of the main results we give. Cai Donghan, born in Sep. 1960, Ph.D graduate student     

光场纠缠态制备

利用Ｒａｍｓｅｙ场以及大失谐民政部下的二能级子与光场的色散作用可以制备光场的Ｅｉｎｓｔｅｉｎ－Ｐｏｄｏｌｓｋｙ－Ｒｏｓｅｎ（ＥＰＲ）态和多光场的纠缠态，得出这些量子态之间的距离最大并且上人有最大纠 度和是了大冯．诺依曙熵．最乒指出这些态在量子信息光学中的应用。     

Amyloid fibrils from the viewpoint of protein folding

In amyloid related diseases, proteins form fibrillar aggregates with highly ordered -sheet structure regardless of their native conformations. Formation of such amyloid fibrils can be reproducible in vitro using isolated proteins/peptides, suggesting that amyloid fibril formation takes place as a result of protein conformational change. In vitro studies revealed that perturbation of the native structure is important for the fibril formation, and it is suggested that the mechanisms of amyloid fibril formation share the mechanisms of protein folding. In particular, amyloid fibril formation is similar to one of the common features of proteins, i.e. amorphous aggregation upon partial unfolding, which is likely driven by hydrophobic interactions through exposed protein interior. However, these molecular associations are distinct phenomena, and identifying factors that lead to amyloid fibril formation would precede our understanding of the mechanisms of amyloid fibrillization. The necessity of understanding the nature of protein denatured states is also suggested.Received 6 July 2003; accepted 19 August 2003     

一维准周期体系中电子态的延展性研究

利用转移矩阵方法,研究了一系列一维准周期体系的电子性质,该一维准周期体系由递推关系S_(t 1)={S_l~(2j-1),S_(l-1)~(2i)}构造,其中l≥1,i和j为正整数,而初始条件为S_0和S_1,研究发现,该一维准周期体系中存在延展的电子态。     

2-(4-甲苯基)-4-(取代)苯基-1,3,4-哒嗪-5-酮构效关系的T.Kohonen网络研究

本文运用Ｔ．Ｋｏｈｏｎｅｎ自组织人工神经网络建立了杀螨剂２－（４－甲苯基）－４－（取代）苯基－１，３，４－口恶哒嗪－５－酮的杀螨活性与其结构特征参数间的非线性关系．结果表明，该方法识别成功率较高，可望成为研究药物构效关系的有效辅助手段