八光子相干态的高阶压缩特性

提供了一种计算多光子相干态高阶压缩的简便方法，并对八光子相干态的高阶压缩特性进行了详细的研究，还提出了一些多光子相干态高阶压缩的普遍性质。     

从关联理论的角度研究广告中的双关

关联理论认为交际是一种明示推理的过程，是听话者对说话者的意图进行识别的认知过程。广告是一种特殊的交际行为。本文从关联理论视角出爰，对广告中的双关语进行分析。     

0.1meV能量分辨率扫描隧道谱的发展及其在单自旋态探测中的应用

本研究利用低温扫描隧道显微镜研究了吸附在超导体表面上的磁性杂质诱导的束缚态。通过提高扫描隧道谱的能量分辨率,可以观察到对应于不同角动量散射通道的多重束缚态。该工作提供了一种探测单个自旋态以及研究磁性与超导相互竞争等的灵敏实验手段。     

On forecasting counts

Forecasting for a time series of low counts, such as forecasting the number of patents to be awarded to an industry, is an important research topic in socio‐economic sectors. Recently (2004), Freeland and McCabe introduced a Gaussian type stationary correlation model‐based forecasting which appears to work well for the stationary time series of low counts. In practice, however, it may happen that the time series of counts will be non‐stationary and also the series may contain over‐dispersed counts. To develop the forecasting functions for this type of non‐stationary over‐dispersed data, the paper provides an extension of the stationary correlation models for Poisson counts to the non‐stationary correlation models for negative binomial counts. The forecasting methodology appears to work well, for example, for a US time series of polio counts, whereas the existing Bayesian methods of forecasting appear to encounter serious convergence problems. Further, a simulation study is conducted to examine the performance of the proposed forecasting functions, which appear to work well irrespective of whether the time series contains small or large counts. Copyright © 2008 John Wiley & Sons, Ltd.     

过渡元素原子"例外"电子层结构的浅释

过渡元素原子电子层结构是长期教学过程的难点，本文用原子轨道能、洪特规则、相对论性效应的概念较好地解释了过渡元素原子“例外”电子层结构。     

浅析服装广告语中的语用预设

语用预设是广告语言中经常使用的策略,在广告语中扮演着十分重要的角色。本文回顾了语用预设的理论,用实例阐释了语用预设的五大特征,最后,选取了很少有人分析的服装广告语作为研究对象,分析了其中存在的语用预设以及其在广告中产生的效应。     

Solvent effects of photoinduced electron transfer reactions of triplet fluorenone with amines

The property of the lowest excited triplet state of fluorenone (FL) in acetonitrile, ethyl acetate, toluene, cyclohexane has been investigated using time-resolved laser flash photolysis. The appearances of the corresponding cation radicals and anion radicals suggest that the electron transfer reaction occurs between ³FL* and amines. Experimental results show a decrease in the quenching rate constants along with reducing solvent polarity. The change of quenching rate constants of the FL excited triplet with the three N,N-dimethylaniline derivatives are explained using the Hammett constant.     

XXZ自旋信道中的纠缠演化

本文系统地研究了XXZ型自旋信道的纠缠演化,发现对于某些初态,纠缠在演化的过程中会出现突然死亡的现象;进一步研究了自旋信道的长度和各向异性对纠缠演化的影响,发现自旋个数的增加会使退相干得到加强,并且使得纠缠死亡的时间延长,而各向异性参数对纠缠演化也有很大影响,死亡时间会随参数增大而缩短,而纠缠的回复则会变弱.     

清华大学物理系原子核结构实验研究进展

在清华大学百年校庆之际,我们对近年来清华大学物理系有关原子核结构实验研究的主要进展作一介绍,内容包括在A≈140缺中子核区核的形状驱动效应研究,如扁椭形变带、形状共存等;在A≈110丰中子核区核的多声子γ振动带结构、新手征二重带、新的准粒子带结构研究等;在A≈150丰中子核区核的八极形变研究等.研究成果对原子核结构的理解提供许多新的重要信息.     

高师化学专业多媒体教学效果的调查及分析

从6个方面调查化学专业学生对多媒体教学形式的态度反应,对所得数据进行统计学分析,以获得对教学效果评价的反馈.调查结果表明,在化学专业教学中,多媒体技术与传统教学手段相比,有明显优势,但必须注意到多媒体技术作为教学的辅助手段和一种认知工具,不能完全替代传统教学.此外,多媒体教学也受到学校教学硬件设施等客观因素制约.