红宝石Cr~(3+)∶Al_2O_3的电子云延伸效应及压力对电子云延伸效应影响(英文)

本文以 Cr3 +自由离子的 3 d电子径向波函数为基础 ,对 Cr3 +∶Al2 O3 中的电子云延伸效应进行了理论研究 ,引入了电子云延伸效应系数 κ,得到了 Cr3 +∶Al2 O3 中 Cr3 +离子的最优化 3 d电子径向波函数 .并研究了压力对电子云延伸效应系数κ的影响     

Note on rare Z-boson decays to double heavy quarkonia

Within the standard model, we have investigated rare Z-boson decays into double heavy quarkonia, \begin{document}$ Z\to VV $\end{document} and \begin{document}$ Z\to VP $\end{document}, with V and P denoting vector and pseudoscalar quarkonia, respectively. It is assumed that the leading-order QCD diagrams would give the dominant contributions to these processes, and the corresponding branching fractions, for instance, \begin{document}$ {\cal B}(Z\to J/\Psi J/\Psi) $\end{document}, have been estimated to be approximately\begin{document}$ 10^{-13} $\end{document} in literature. However, these decays could also happen through electromagnetic transitions \begin{document}$ Z\to V\gamma^* $\end{document} and \begin{document}$ Z\to P\gamma^* $\end{document}, with the virtual photon transforming into V. Interestingly, the smallness of the vector quarkonium mass can give rise to a large factor \begin{document}$ m_Z^2/m_V^2 $\end{document} relative to the QCD contributions, which thus counteracts the suppression from the electromagnetic coupling. We systematically include these two types of contributions in our calculation to predict branching fractions for these decays. Particularly, owing to the virtual photon effects, it is found that \begin{document}$ {\cal B}(Z\to J/\Psi J/\Psi) $\end{document} will be significantly enhanced, up to \begin{document}$ 10^{-10} $\end{document}.     

苄基保护甘露糖羧酸酯的NMR研究

应用NMR技术研究了1-0-(3,5-二硝基苯甲酰基)-2、3、4、6-四-0-苄基-D-吡喃甘露糖的α、β异构体的构型和糖环上碳氢归属情况,总结了苄基保护甘露糖羧酸酯构型的确证方法及影响糖环上碳氢化学位移的一些规律;并对其它13种四苄基甘露糖羧酸酯的NMR谱进行了研究,提供了这些化合物的¹³C和¹H NMR数据.     

Z=18—82原子的同步辐射内壳层光电离积分截面的计算和讨论

此文计算了Ｚ＝１８－８２的原子在北京同步辐射４Ｂ９Ａ束线的白色Ｘ光照射下的光电离积分截面Ｇ值。结果表明，有三个Ｇ值较大的区域，Ｚ＝１８－２０，３９－４７和５９－８２，最大值分别为３．８×１０－６，１．６×１０－５和３．５×１０－５ｐｈｏｔｏｎｓ·ｃｍ２／ｓ。同时，估计了平衡时主要多重电荷态离子数目，分析了用同步辐射和离子阱进行多重电荷态实验的新的候选原子，讨论了有关实验方法和技术。     

掺杂8-羟基喹啉铝薄膜的电致发光特性研究

在具有电致发光(EL)的有机整合染料8-羟基喹啉铝(Alq3)中接以染料罗丹明6G(R6G),用真空热蒸发的方法制备器件,获得了峰值波长575nm的黄色直流薄膜电致发光,从而通过掺杂改变了发光颜色.并在Alq3发光层不同区域插入一掺杂薄层(Alq3:R6G),利用其发光波长与未掺杂部分(Alq3)的不同,以此作为“探测层”,通过对器件光谱及电学特性的测量与分析,探讨了有关发光区域,发光机理,界面对发光影响等基本问题.     

铽－甲基吲哚乙酰丙酮三元配合物发光过程研究

测定和分析了ＲＥ．Ｌ１．Ｌ２（ＲＥ＝Ｔｂ（Ⅲ）、Ｇｄ（Ⅲ），Ｌ１＝３Ｍ（３甲基吲哚－１－乙酰基丙酮），Ｌ２＝ＴＰＰＯ、Ｐｈｅｎ、Ｄｉｐｙ）三元配合物的荧光光谱、磷光光谱、磷光寿命及变温荧光光谱等．讨论了Ｔｂ（Ⅲ）与配体之间的能级匹配和Ｌ１与Ｌ２的三重态之间传能的问题，说明了影响这些三元配合物荧光效率的主要因素及其发光过程．     

光纤编码器的研制

近年来随着光纤技术的发展,各种光纤传感器日臻完善。我们先后制作出光纤微压力传感器、光纤液位传感器、光纤高温传感器以及用于化学溶液的浓度测量等系列光纤传感器。由于社会和生产的需要,在我所过去研究工作的基础上,又研制出光纤编码器的实验样机。本文阐述研制的光纤编码器的工作原理、设计制作及技术指标。并对其应用范围进行讨论。     

ICP－AES法测定富锗酵母中微量元素

本文采用美国ＬｅｅｍａｎＬａｂｓ公司中阶梯光栅光谱仪测定了人工培养的富锗酵母中高含量锗及镁、铜、锌、铁、钾、钠等微量元素，研究了富锗样品的前处理方法，样品加标回收率在９０％－１０３％之间，测量相对标准偏差：锗１０％，镁、铜、锌、铁、钾、钠等元素小于７％。     

Oscillatory Behavior of Solutions for a Class of Second Order Nonlinear Differential Equation with Perturbation

In this paper, a class of second order nonlinear differential equations with perturbation is studied. By using the generalized Riccati transformation, the integral averaging technique and the method of classification, new oscillation criteria are obtained for all solutions of the equations, which generalize and improve some known results.     

An Inexact SQP Newton Method for Convex SC<Superscript>1</Superscript> Minimization Problems

In this paper, we present a globally and superlinearly convergent inexact SQP Newton method for solving large scale convex SC ¹ minimization problems under mild conditions. In particular, the BD-regularity assumption made by Pang and Qi in Journal of Optimization Theory and Applications, 85 (1995), pp. 633–648 is replaced by a much more realistic assumption. Our numerical experiments conducted on least squares semidefinite programming with lower and upper bounds demonstrate that our inexact SQP Newton method is much more efficient than its exact version and is competitive with existing methods when the number of simple constraints is very large.