单糖和寡糖的离子色谱法分析研究

单糖和寡糖作为糖蛋白和多种复合糖类的一个组分在生物体内起着重要的作用。研究这些糖类分子的结构与功能关系,有必要建立一种快速、简便、灵敏的单糖和寡糖的分析方法。经典的层析法分辨率低,分析时间长,定量测定困难。气相色谱法主要用于分析单糖,     

Vapour Recoil Effect on a Vapour Liquid System with a Deformable Interface

A new two-sided model of vapour-liquid layer system with a deformable interface is proposed. In this model, the vapour recoil effect on the Marangoni-Bénard instability of a thin evaporating liquid layer can be examined only when the interface deflexion is considered. The instability of a liquid layer undergoing steady evaporation induced by the coupling of vapour recoil effect and the Marangoni effect is analysed using a linear stability theory. We modify and develop the Chebyshev-Tau method to solve the instability problem of a deformable interface system by introducing a new equation at interface boundary. New instability behaviour of the system has been found and the self-amplification mechanism between the evaporation flux and the interface deflexion is discussed.     

Teleportation for an Ionic Entangled Internal State by Entanglement Swapping

We present an effective scheme to teleport an unknown ionic entangled internal state via trapped ions without joint Bell-state measurement. In the constructed quantum channel process, we adopt entanglement swapping to avoid decrease of entanglement during the distribution of particles. Thus our scheme provides new prospects for quantum teleportation over longer distance. The distinct advantages of our scheme are that our scheme is insensitive to heating of vibrational mode and can be generalized to teleport an N-ion electronic entangled GHZ class state. Furthermore, in our scheme the success probability can reach 1.     

快离子辐照损伤能深度分布理论计算

本文描述了一个用于计算快离子在无定形结构靶材料中引起的损伤能量分布的计算程序HEDEP-1.程序中采用了I.Manning等发展的近似计算方法,在处理入射离子与靶原子碰撞过程中考虑了核力影响,在电子阻止本领计算中选用了最新发表的J.F.Ziegler等数据.程序适用的能量范围是较宽的,从L.S.S.能区一直延伸到弹-核系统的库仑势垒以上,可以计算单质和多至四种元素组成的均匀靶材料.     

粘滞液体中落球运动的实验研究

一、引言对于粘滞液体中小球的自由下落运动,一般理论分析认为,小球进入液体之后最初一段做加速运动,经过一段路程l_0后呈现匀速运动。该匀速运动的速度(即收尾速度)v_0可由下式表述 v_0=2/9 (ρ-ρ′)/η gr~2 式中ρ——球体密度;ρ′——粘滞液体密度;r——小球半径;g——重力加速度;η——粘滞液体的粘滞系数。其中从液面至小球开始做匀速运动这段距离l_0是人们极为关注的。然而,粘滞液体中落球运动的整体规律,从液面至进入匀速段的距离l_0的确定,底     

落球法测液体粘度实验公式中两补正系数的实验求法

当半径为r0的光滑小圆球,以速度v在均匀的无限宽广的液体中运动时,若速度不大,球也很小,在液体中不产生涡流的情况下,根据斯托克斯公式,球在液体中所受到的阻力F为F=6πηvr (1)式中η为液体的粘度.