从第15届男篮世锦赛看中国男篮与世界强队的差距

通过第15届男篮世锦赛的排名及中国男篮的全部比赛,根据数据分析和中国男篮的现场表现,对参加本届世锦赛篮球比赛的中国男篮进行了较为客观的定位,指出了中国男篮与世界强队的主要差距,并着重提出了参加2008年奥运会篮球比赛,中国男篮亟待解决的问题和需采取的措施。     

三峡库区某滑坡稳定性分析及治理方案

结合滑坡实例,从滑坡地质环境出发,通过对滑坡变形特征机制和稳定性分析,认为前缘的临空面,坡体倾向与基岩面基本一致以及暴雨是诱发该滑坡的主导因素,并根据具体工程对治理方案进行了比较,提出了合理的治理方案。     

学报编辑工作规范化初探

在实践的基础上，提出了学报编辑完整的操作方案．     

金寨台低频电磁扰动观测的降雨影响与校正

本文描述了金寨地震台DPDC-2低频电磁扰动仪和GS-2000电磁扰动仪的观测原理及其运行环境,利用金寨地震台最近两年的数字观测资料,分析该台电磁波变化与降雨的关系,认为两者之间存在着一定的相关关系,降雨是造成电磁波突变的主要原因,并尝试通过数学方法剔除资料中的降雨影响。     

蒙城地震台地电场观测干扰排查

蒙城地震台大地电场观测于2000年1月投入使用以来,观测系统,数据资料稳定连续。观测数据在2012年12月突然出现不明原因干扰,NS测向、EW测向及N45W测向长短极距出现突跳和锯齿形变化。通过一系列的外线路检查及数据分析,寻找干扰产生的原因。     

Dark Lump Excitations in Bose—Einstein Condensates

We investigate the dynamics of two-dimensional matter-wave pulses in a Bose-Einstein condensate with diskshaped traps.For the case of repulsive atom-atom interactions,a Kadomtsev-Petviashvili equation with positive dipersion is derived using the method of multiple scales.The results show that it is possible to excite dark lump-like two-dimensional nonlinear excitations in the Bose-Einstein condensate.     

EAST ƫ����V ��������ȴˮ�ܵķ���ʴ����

针对EAST前几轮实验中出现的偏滤器DOME板和外靶板间隙区域冷却水管被等离子体烧蚀破坏的问题,提出延伸外靶板石墨瓦结构以扩大打击面积和给冷却水管加装护套两种解决方案,并通过分析确定了具体参数。研究表明,适度的延伸外靶板可有效地防止高能粒子轰击靶板后水管,且对偏滤器区域流导影响不大;采用5mm壁厚高温耐熔钼管护套可有效地保护水管。后一轮的实验结果证明,该方案较好的解决了问题。     

Faraday rotation in a resonant five-level system via electromagnetically induced transparency

We study the Faraday rotation of polarization of a probe field in a cold, coherently driven five-level system with an M-type configuration. By means of a method of multiple scales we derive two coupled nonlinear envelope equations, which govern the evolution of two circularly polarized components of the probe field. It is shown that due to the quantum interference effect induced by two control fields, one can obtain a large rotation angle with a very low absorption of the probe field. In addition, an efficient control over the polarization state of the probe field in the system can also be easily realized.     

Landau damping of collective modes in a harmonically trapped Bose--Einstein condensate

This paper proposes a method for calculating the Landau damping of a low-energy collective mode in a harmonically trapped Bose--Einstein condensate. Based on the divergence-free analytical solutions for ground-state wavefunction of the condensate and eigenvalues and eigenfunctions for thermally excited quasiparticles, obtained beyond Thomas--Fermi approximation, this paper calculates the coupling matrix elements describing the interaction between the collective mode and the quasiparticles. With these analytical results this paper evaluates the Landau damping rate of a monopole mode in a spherical trap and discusses its dependence on temperature, particle number and trapping frequency of the system.     

一种新型结构的黄光有机电致发光器件

用有机荧光染料罗丹明B(Rhodamine B)作为掺杂剂, 采用双量子阱结构制备了一种新型的黄光有机电致发光器件,器件结构及各层厚度为：ITO/CuPc(6 nm)/NPB(20 nm)/Alq₃(3 nm)/Alq₃：Rhodamine B(3 nm)/Alq₃(3 nm)/Alq₃：Rhodamine B(3 nm)/Alq₃(30 nm)/Liq(5 nm)/Al(30 nm)。研究发现Rhodamine B的掺杂浓度对该器件的发光亮度和发光效率有较大影响。当Rhodamine B的掺杂浓度为1.5 wt％时, 得到了最大电流效率1.526 cd·A-1,最大发光亮度1 309 cd·m-2的黄光有机电致发光器件。由器件的电致光谱曲线,可以看到在发光层之间存在着Alq₃向RhB传递能量的过程。由于量子阱的斯托克斯效应与RhB染料分子间的自极化作用,随着掺杂浓度的增加,λ_max出现明显红移。