含Eu3+离子的Na2O-K2 O-SiO2-Al2O3系统玻璃的制备及其变温发射光谱与结构特性

通过高温熔融法制备了含Eu^3 离子的Na2O-K2O-SiO2-Al2O3系统玻璃。在488nm波长光的激发下，系统地研究了上述玻璃从77K到700K温度范围的变温发光特征。发现总的荧光强度首先随温度的升高而大幅度升高，然后随温度的升高而减少，用声子辅助吸收与热激活过程及温度淬灭效应定性地解释了上述强度的变化，同时测量与分析了Eu^3 离子的晶格场参量。结果表明，Eu^3 离子与氧离子的距离随着温度升高而变短，而Eu^3 离子的配位数不随温度而变化。     

新型噁二唑有机电致发光小分子光电性质研究

通过升降温差热分析(DSC)曲线、偏光显微镜、紫外吸收光谱、电化学行为曲线以及多层器件等,研究了噁二唑衍生物小分子的电学和光学性质,发现其同时具有液晶性、电子和空穴传输性、发光性等优良性能.引进R-OXD(En)层后的多层器件在低于3 V时就能得到可见光发射,在7 V时可以得到光亮度为1000 cdm^-2.此系列小分子可降低有机电致发光器件开启电压,提高发光亮度和发光效率,是一种非常具有吸引力的有机电致发光小分子.     

Minimal Martingale Measures for Discrete-time Incomplete Financial Markets

Abstract In this note, we give a characterization of the minimal martingale measure for a general discrete-time incomplete financial market.Then we concretely work out the minimal martingale messure for a specificdiscrete-time market model in which the assets'returns in different times are independent.     

A novel binucleating macrocyclic ligand with two alcohol pendants

A novel binucleating 24‐membered macrocyclic ligand, 6,20‐bis(2‐hydroxy­ethyl)‐3,6,9,17,20,23‐hex­aza­tri­cyclo­[23.3.1.1^11,15]triaconta‐1(29),11(30),12,14,25,27‐hexaene (L), was synthesized and crystallized as the tetra­hydro­bromide salt, i.e. 6,20‐bis(2‐hydroxy­ethyl)‐6,20‐di­aza‐3,9,17,23‐hexa­azoniatri­cyclo­[23.3.1.1^11,15]­triaconta‐1(29),11(30),­12,14,25,27‐hexaene tetrabromide tetrahydrate, C₂₈H₅₀N₆O₂⁴⁺·­4Br^?·4H₂O. A crystallographic inversion center is located in the macrocyclic cavity and the two hydroxy­ethyl pendants are on opposite sides of the macrocyclic plane. The benzene rings of the macrocycle are parallel to each other and a π–π‐stacking interaction exists between the benzene rings of adjacent macrocycles, which are separated by 3.791 (9) Å. An infinite intermolecular hydrogen‐bond network stabilizes the crystal.     

PERSISTENCE AND STABILITY OF A DISCRETE PERIODIC PREDATOR-PREY MODEL

In this paper,we investigate the persistence and global asymptotic stability of a discrete predator-prey system.Based on Lyapunov functions,several crite- ria are established concerning the persistence and globally asymptotic stability of difference systems.     

A New Method for Real Root Isolation of Univariate Polynomials

A new algorithm for real root isolation of univariate polynomials is proposed, which is mainly based on exact interval arithmetic and bisection method. Although exact interval arithmetic is usually supposed to be inefficient, our algorithm is surprisingly fast because the termination condition of our algorithm is different from those of existing algorithms which are mostly based on Descartes’ rule of signs or Vincent’s theorem and we decrease the times of Taylor shifts in some cases. We test our algorithm on a large number of examples from the literature and report the performance.      

光子扫描隧道显微镜的光电成像系统研究

本文论述了光子扫描隧道显微镜（ＰＳＴＭ）的显微成像机理、成像规律，针对具体的物理模型进行数值模拟计算，并得到了与实际探测相一致的场分布规律。采用自行研制的光子扫描隧道显微镜（ＰＳＴＭ）的显微实验系统对多种样品进行了表面显微成像研究，获得了关于样品表面三维立体图像信息，通过多种图像处理手段对原始图像进行后期处理，得到了更具视觉效果、更为逼真的样品表面图像。     

催化电聚吡咯对苯二酚及邻苯二酚电催化反应的研究

本文通过循环伏安法研究了催化电聚吡咯膜（ＰＰＹＥ）对对苯二酚及邻苯二酚的电催化反应。讨论了酸度，膜厚度，扫速及浓度等条件对催化过程的影响，同时对二者的电催化反应过程进行了分析和比较。     

运动对小白鼠乳酸脱氢酶(LDH)同工酶的影响初探

经总酶活性测定和凝胶电泳图谱分析发现:剧烈运动后,小白鼠六种组织LDH总酶活性,骨骼肌有显著升高,(p<0.05),其余五种组织均变化不显著;心肌、骨骼肌、肾脏的M型LDH相对活性显著升高(P<0.05),而H型LDH相对活性显著下降(p<0.05);相应地,A亚基比例显著升高,B亚基比例显著下降,这种变化似能反应剧烈运动对小白鼠厌氧代谢的明显影响.     

乙苯氧化脱氢钨硅酸催化剂的研究

考察了钨硅酸及其盐对乙苯氧化脱氢制苯乙烯的催化行为。认为表面积碳物是活性中心,苯乙烯的收率随积碳物C/H增大而增加;载体的比表面积对活性有明显影响。还发现有苯甲酸生成,CO_2主要来自表面积碳物的氧化。