BES离线刻度常数管理系统的研究

回顾了BESⅡ离线数据分析中离线刻度常数数据的文件管理方式;提出了利用数据库进行离线刻度常数进行管理的方法,详细描述了在LINUX操作系统下的实现过程,并讨论了用数据库管理BESⅢ离线刻度常数的可行性、优点以及需要进一步研究的问题.     

Remarkable improvement of brightness for the green emissions in Ce and Tb co-activated LaPO4 nanowires

Ce³⁺ and Tb³⁺ co-activated LaPO₄ nanowires (NWs) were synthesized by the hydrothermal method and studied in contrast to corresponding micrometer rods (MRs). The results indicate that electronic transition rate of Ce³⁺ and Tb³⁺ in NWs had only a little variation in comparison with that in MRs, and energy transfer (ET) rate and efficiency of Ce³⁺→Tb³⁺ in NWs reduced. It is interesting to observe that the brightness for ⁵D₄-⁷F₅ of Tb³⁺ via ET of Ce³⁺→Tb³⁺ in NWs increased several times than that in MRs. This was attributed to the decreased energy loss in excited states being higher than ⁵D₄ of Tb³⁺ ions due to hindrance of boundary.     

服务员假期中以概率p进入的M/G/1排队系统的随机分解

该文研究M/G/1多重休假排队系统，其中在服务员休假中到达顾客以概率p(0≤p≤1)进入。通过引进“服务员忙期”和使用拉普拉斯变换或拉普拉斯— —司梯阶变换，我们获得队长瞬态分布的拉普拉斯变换和稳态分布的递推表达式，进一步得到稳态队长分布的随机分解和在特殊情况下相应的一些结果。     

在Δ≤3的图中上独立数和上无赘数的关系

G（V，E）是一个图。β，IR分别是图G的独立数，上无赘数。这篇文章证明文章［6］中提出的一个猜想.     

Gold 3D Brush Nanoelectrode Ensembles with Enlarged Active Area for the Direct Voltammetry of Daunorubicin

3D gold brush nanoelectrode ensembles (BNEEs) consisted of gold nanowires 100 nm in diameter and 300 nm in length were fabricated by combining the technologies of template synthesis and controlled chemical etching of the membrane. The structure and morphology of the BNEEs was imaged by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The real active areas of BNEEs were found to be different when characterized by different redox species. The direct redox of daunorubicin (DNR) at the gold BNEEs exhibited absorption‐controlled characteristics and high current activity. BNEEs are reliable and effective in DNR detection.     

剖分Petersen图得到的新测地块

通过剖分Petersen图我们得到了一类新的测地块．由此成功构造了给定直径为6和围长为11的测地块，解决了近二十年来悬而未决的一个存在性和构造性问题．     

Coexistence of large positive and negative magnetoresistance in La0.7Ca0.3MnO3 films with microcracks

The coexistence of large positive and negative low-field magnetoresistance (LFMR) in the ferromagnetic La_0.7Ca_0.3MnO₃ thin films with ordered microcrack (MC) distributions is reported. For the films with the highest linear density of MC, the negative LFMR can be up to −60% and rapidly changes to the positive value of 25% at 200 Oe field with the increase of temperature. We discuss the effect based on the spin-polarized tunneling and inhomogeneous magnetic state induced by the natural formations of MC in the films.     

基于约瑟夫森器件的超导量子比特

超导量子比特利用了超导约瑟夫森隧道结的非线性效应,采用了半导体集成电路的工艺,以其无能耗,大设计加工自由度,易规模化等优点而倍受注目。本文对超导量子比特的基本原理及发展过程作了简要综述。首先简要回顾了量子计算的历史,然后介绍了超导量子比特的设计及其调控,并对各种超导量子比特的消相干进行了讨论。