Controlling the collision between two solitons in the condensates by a double-barrier potential

We present an analytical solution of two solitons of Bose-Einstein condensates trapped in a double-barrier potential by using a multiple-scale method.In the linear case,we find that the stable spots of the soliton formation are at the top of the barrier potential and at the region of barrier potential absence.For weak nonlinearity,it is shown that the height of the barrier potential has an important effect on the dark soliton dynamical properties.Especially,in the case of regarding a double-barrier potential as the output source of the solitons,the collision spots between two dark solitons can be controlled by the height of the barrier potential.     

Growth of deuterium clusters in a gas jet and ion energy spectrum of clusters in ultra-short laser field

Large deuterium clusters are generated using a cryogenic pulse valve with a cone nozzle (21 mm long, 4° open angle). Rayleigh scattering experiment is carried out to obtain the scaling relation between scattering signal SR and backing pressure P0. A method using the Coulomb explosion model is proposed to verify that the clusters continue to grow after their leaving the nozzle. Our experiments suggest a tentatively optimized position for laser cluster interaction.     

液晶/水界面上的氢键作用诱导液晶取向转变

本文提出液晶/水界面上氢键作用可以诱导热致型液晶(戊基联苯氰,简称: 5CB)发生取向转变.当液晶5CB膜接触酚类(如对硝基苯酚)水溶液的时候,由于酚类物质的酚羟基与液晶5CB分子中的氰基在液晶水界面上形成了氢键,在氢键的作用下使得液晶5CB由平行取向转变成了垂直取向.此外,还利用了液晶传感器可视化了酚类物质与牛血清蛋白(BSA)之间的相互作用.本文的研究结果可为研究液晶/水界面上的界面现象提供新的思路,并且有望开发出基于氢键作用的液晶生物化学传感技术.     

Entanglement Dynamics of Two Atoms in a Double Damping Jaynes-Cummings System

The entanglement between two stationary qubits is a kind of valuable quantum resources in quantum information or quantum network. This paper investigates the time evolution of the entanglement between two atoms, which are initially prepared in the Bell states and each of which interacts with its own cavity field in the identical and non-identical double damping Jaynes-Cummings (J-C) system. It mainly considers the effect of the atomic spontaneous decay Γ and the decay of cavity field κ on the two-qubit entanglement in such system. While causing the decay of entanglement, Γ and κ can also play a positive role in the entanglement evolution, which may imply a way to better control and maintain the entanglement. What is more, the rules governing the transfer of entanglement between two-qubit subsystems in strong coupling regime are finally studied by taking Γ and κ into consideration.     

新型晶态层状载体聚(苯乙烯-苯乙烯基膦酸)-磷酸锌轴向固载手性Salen Mn(Ⅲ)的合成及催化烯烃的环氧化性能

在温和条件合成了新型晶态层状有机聚合物-无机杂化载体材料聚(苯乙烯-苯乙烯基膦酸)-磷酸锌, 结合实验数据提出了其可能的理想结构模型. 对该载体进行氯甲基化和酚羟基化修饰后, 轴向配位固载手性Salen Mn(Ⅲ), 合成了一类新型的多相催化剂. 以间氯过氧苯甲酸为氧源, 考察了其对α-甲基苯乙烯及茚不对称环氧化反应的催化性能. 结果表明, 这类固载催化剂具有与均相Jacobsen催化剂相当或更高的催化活性和对映选择性, 并具有优良的重复使用性. 特别是在该氧化体系中, 当无助催化剂N-甲基吗啉氮氧化物(NMO)参与时, 固载催化剂获得更高的转化率及e.e.值, 这为其扩大化生产增加了可能性.     

混沌背景中信号参数估计的新方法

怎样提取混沌背景中信号的参数具有重要意义.在重构的相空间中,叠加有其他信号的混沌信号时间序列重构的点集会偏离混沌吸引子所在光滑流形,依据这一性质并综合利用混沌背景中信号本身的特性,提出一种参数估计的新方法：最小相对奇异值(MRSV)法.该方法先建立逆滤波器,由其输出重构相空间,然后改变其参数,使输出信号在嵌入空间中作局部奇异值分解的相对奇异值最小,来实现参数估计.AR模型参数和正弦信号频率估计的仿真结果验证了该方法的有效性. 关键词： 混沌 参数估计 最小相对奇异值(MRSV) 逆滤波器     

利用瞬态吸收光谱技术研究水体中苯与亚硝酸的交叉反应机理

利用瞬态吸收光谱技术进行了有氧、无氧条件下苯与亚硝酸水溶液复相体系的交叉反应机理研究 ,初步考察了这些瞬态物种的生长与衰减等行为 ;并对其光解产物进行了GC/MS分析 .研究表明 ,HNO2 在 3 5 5nm紫外光的照射下可产生·OH和NO+ ,·OH自由基和苯反应生成C6H6 OHadduct ,反应速率常数为 8 9× 10 9L·mol-1·s-1,在有氧条件下C6H6 OHadduct进一步氧化为C6H6 OHO2 ,反应速率常数 3 3× 10 8L·mol-1·s-1;NO+ 自由基和苯作用形成C6H6 NO+ πcomplex ,然后进一步分解     

一类环丙烷螺环化合物的简易合成和结构表征

以乙二醇二甲醚为溶剂,在K2CO3及痕量水存在下,鉮盐和多取代贫电子烯烃反应,高立体选择性合成了顺-1-甲氧羰基-2-取代芳基-6-环己烷基-5,7-二氧杂螺-〔2,3〕-4,8-二酮。采用IR、MS、1H NMR、13C NMR、DEPT及二维核磁共振技术对所合成的化合物进行了结构表征,并以NOESY实验确定了该化合物为顺式结构的环丙烷衍生物。     

1.06μm 激光直接驱动烧蚀靶内爆压缩特性

介绍了直接驱动内爆压缩特性实验研究的实验靶型和测量方法.在神光Ⅱ激光装置上采用多种高时空分辨和高能谱分辨的组合型诊断设备获取了内爆压缩相关信息，得到了靶丸辐照均匀性、内爆压缩对称性、径向会聚比、内爆速度以及靶丸球壳平均电子温度，获得的 结果可作为优化靶结构与参数及激光辐照条件的依据.给出了实验中获得的典型结果，并对结果进行了简要的分析讨论. 关键词： 激光烧蚀 直接驱动 诊断技术