新疆苔藓植物的研究进展

苔藓植物是植物界的一个重要门类,植株矮小,适应性广.新疆苔藓植物的研究主要集中在经典分类学、苔藓植物区系、形态解剖学、专科、专属等方面.而苔藓植物生态学及苔藓植物多样性方面的研究才刚刚起步.本文扼要介绍了20多年来苔藓植物各个分支学科的研究现状,探讨了苔藓植物研究今后的发展趋势.文中,还对我区苔藓植物研究工作今后的研究方向提出了作者的见解.     

离子对高效液相色谱法测定果汁中的合成色素

采用聚酰胺吸附前处理果汁饮料,用离子对反相液相色谱法测定柠檬黄、日落黄、苋菜红、胭脂红四种合成色素。以含对离子试剂四丁基溴化铵0．005mol／L的甲醇：水=45：55(V／V)为流动相,15min内可完成四种合成色素的分离,回收率为89．8％～102．2％,变异系数为1．81％～2．22％。     

Deterministic quantum teleportation and information splitting via a peculiar W-class state

In the paper ({\em Phys. Rev.} 2006 A {\bf 74} 062320) Agrawal {\em et al}. have introduced a kind of W-class state which can be used for the quantum teleportation of single-particle state via a three-particle von Neumann measurement, and they thought that the state could not be used to teleport an unknown state by making two-particle and one-particle measurements. Here we reconsider the features of the W-class state and the quantum teleportation process via the W-class state. We show that, by introducing a unitary operation, the quantum teleportation can be achieved deterministically by making two-particle and one-particle measurements. In addition, our protocol is extended to the process of teleporting two-particle state and splitting information.     

Generation of a four-particle entangled state via cross-Kerr nonlinearity

We propose a scheme for generating a genuine four-particle polarisation entangled state ︱χ00 that has many interesting entanglement properties and potential applications in quantum information processing. In our scheme, we use the weak cross-Kerr nonlinear interaction between field-modes and the non-demolition measurement method based on highly efficient homodyne detection, which is feasible under the current experiment conditions.     

磁场对激波冲击R22重气柱作用过程影响的数值模拟

为研究平面入射激波与磁化R22重质圆形气柱的作用过程,首先通过数值方法得到了不同初始条件下激波诱导R22气柱的Kelvin-Helmholtz (KH)及Richtmyer-Meshkov (RM)不稳定性导致的重气柱变形过程,并详细讨论了不同情况下透射激波在气柱内聚焦诱导射流的过程;然后在加入磁场的情况下,采用CTU+CT算法进行数值模拟,以保证数值结果满足任意时刻磁场的散度为零。计算结果表明:磁场对激波诱导R22气柱不稳定性具有抑制作用;法向磁场和流向磁场都可以很好地抑制RM不稳定性;对于KH不稳定性,法向磁场的控制效果更好,不仅可以抑制界面上涡串的卷起,还可以阻止主涡的发展,而流向磁场做不到后者;磁场对射流影响不大,射流处的磁能量可以一定程度上抑制射流的衰减,同时法向磁场可以减小聚焦时压力及速度峰值。     

超细二氧化硅粉体对淀粉火焰抑制的实验研究

为了探究不同粒径二氧化硅粉体抑制效果上的差异,采用小尺寸竖直燃烧管道系统,研究添加10 μm和30 nm二氧化硅粉体时,不同粒径小麦淀粉燃烧的火焰传播、温度、速度等参数特性的变化。实验结果表明:超细二氧化硅粉体能减弱小麦淀粉燃烧反应强度;30 nm二氧化硅粉体抑制效果优于10 μm二氧化硅,当小麦淀粉粒径小于25 μm时,质量浓度为0.43 kg/m3、粒径30 nm的超细二氧化硅粉体可使小麦淀粉火焰亮度明显下降,最高温度下降38.07%,最大速度和平均速度分别下降42.25%、65.59%;超细二氧化硅粉体主要起物理抑制作用,抑制效果与小麦粒径成反比关系,小麦粒径越小,二氧化硅抑制效果越好。     

Entangling two oscillating mirrors in an optomechanical system via a flying atom

We propose a novel scheme for generating the entanglement of two oscillating mirrors in an optomechanical system via a flying atom. In this scheme, a two-level atom, in an arbitrary superposition state, passes through an optomechanical system with two oscillating cavity-mirrors, and then its states are detected. In this way, we can generate the entangled states of the two oscillating mirrors. We derive the analytical expressions of the entangled states and make numerical calculations. We find that the entanglement of the two oscillating mirrors can be controlled by the initial state of the atom,the optomechanical coupling strength, and the coupling strength between the atom and the cavity field. We investigate the dynamics of the system with dissipations and discuss the experimental feasibility.     

利用交叉克尔非线性效应实现纠缠转移

提出了一种基于交叉克尔非线性效应的纠缠态转移方案.利用该方案可以将离散变量光场态之间的纠缠关系转移到连续变量光场态(相干态)上.通过适当设置初始相干态的振幅,该方案可以使转移后的纠缠相干态处于最大纠缠态. 关键词： 交叉克尔效应 纠缠转移 纠缠相干态     

问题与解答

一本期问题‘__1已知某等差数列的S一s二,二斗”,求葱正占。不.二0。2求锐角。的值,使方程劣2一铭co:a十2=O和方程x’一4x‘.:二一2二.有公共根。3一个四位数,若加上195完全平方数,则称这个四位数为’数的个数。5后就成为一个“好数”,求好山东高青一中不查表求证lo若函数f(x)胡称亚提供g:万+10多。万)2.对于任意正数a、bf(a二f(a)(a/b)二f 已知方程 +f(b),求证(a)一(b)满足xZ+1.一十众=器有一个根是吐事上其中幼负数,求k。翔能挤者二申肖继才提撰 7设才 (x+百)(夕+ (言+x)(劣+样的关系?今。,要使下列三式同时成立.”zx,(沙+之)(之+劣)。x…     

纠缠播送与解纠缠

近年来,人们发现在量子信息领域存在的许多的"no-going"理论.在研究纠缠的产生的同时也开始研究解纠缠.