Effects of Quantum Correction on Dynamical Phase Transition in a Single Species Bosonic Josephson Junction

In this paper,by employing Bogliubov backreaction method,we investigate quantum correction effects on dynamical phase transition in a single species bosonic Josephson junction induced by increasing nonlinear interaction.Compared with mean field theory results,we find that the transition point is shifted.The dynamical phase transition is accompanied by a change of the entanglement entropy,which is found to reach a maximum at the transition point of the mean field theory.     

微芯片毛细管电泳电化学/电化学发光同时检测药物分子

提出了基于毛细管电泳芯片的电化学和电化学发光同时检测技术.在此芯片系统中,三联吡啶钌Ru(bpy)₃²⁺[Tris(2,2'-bypiridyl) ruthenium(Ⅱ)]既作为电化学发光(ECL)检测所需的发光试剂与被分析物反应,生成激发态的Ru(bpy)₃^2+*,从而产生电化学发光信号;又具有催化作用参与电极表面的电化学反应,从而得到增强的电流响应.电化学信号与电化学发光信号同时产生并被分别纪录,从而实现了电化学和电化学发光的同时检测.这种芯片由两部分构成,分别是带有分离和进样通道的聚二甲基硅氧烷(PDMS)层和ITO(Indium tin oxide)工作电极底片.PDMS层与ITO电极底片采用可逆键合的方式组成芯片,该芯片大大简化了操作过程,提髙了发光信号的采集效率.在整个实验过程中,ITO电极表现出良好的稳定性,可长时间多次使用.选用山莨菪碱和氧氟沙星两种药物分子作为被分析物,对芯片系统性能进行了表征.     

耦合哈密顿系统中测度同步发生机理的研究

测度同步是在耦合哈密顿系统中发现的一种奇特现象.采用Poincaré截面方法,研究了离散及连续的哈密顿系统中测度同步的发生机理.结果表明,测度同步的发生源于相空间分界线的穿越行为.     

Nonlocal Measure Synchronization in Coupled Bosonic Josephson Junctions

We investigate the measure synchronization （MS） in two coupled bosonic Josephson junctions. By tuning up the coupling between the two dynamical systems, in addition to the normal MS, a nonlocal MS （NLMS） state is observed. Furthermore, with the dynamic stability analysis, we present the exact analytical solution of the transition point to NLMS.     

Measure synchronization in hybrid quantum-classical systems

Measure synchronization in hybrid quantum-classical systems is investigated in this paper. The dynamics of the classical subsystem is described by the Hamiltonian equations, while the dynamics of the quantum subsystem is governed by the Schrödinger equation. By increasing the coupling strength in between the quantum and classical subsystems, we reveal the existence of measure synchronization in coupled quantum-classical dynamics under energy conservation for the hybrid systems.     

塑性变形对钢轨钢磨损影响的试验研究

塑性变形是铁路轮－轨在高接触压力下不可避免的现象，对磨损的发生和发展有重要影响，然而目前尚未见到塑性变形量有效测量方法的文献报道。通过对铁路轮－轨磨损的现场调查与试验研究，提出了一种新的磨损表面形貌测量法。     

Collective dynamics in a non-dissipative two-coupled pendulum system

We study the collective dynamics of a non-dissipative two-coupled pendulum system, including phase synchronization （PS） and measure synchronization （MS）. We find that as the coupling intensity between the two pendulums increases, the PS happens prior to the MS. We also present a three-dimensional phase space representation of MS, from which a more detailed information about evolution can be obtained. Fu~.hermore, the order parameters are introduced to describe the phase transition between PS and MS. Finally, through the analysis of the Poincar6 sections, we show that the system exhibits separatrix crossing behavior right at the MS transition point, and as the total initial energy increases, the Hamiltonian chaos will arise with separatrix chaos at the chaotic MS transition point.     

弯曲振动模式压电超声微马达研究

对一种圆柱状结构、基于弯曲振动模式的压电超声微马达作了一些结构改进性探索和实验研究,并采用有限元方法对其振动模式进行了分析．已研制的直径为15mm、长25mm的微马达样机,显示出非常高的角分辨率（0．01°）、低速（30r／min～70r／min）和大的力矩（0．055N.m）特性,已在激光多维精密控制系统中获得成功的应用．     

Coherent spin dynamics in spin-imbalanced ferromagnetic spinor condensates

We study the coherent spin dynamics of a ferromagnetic spinor Bose–Einstein condensate(BEC)in its domain formation process with an arbitrary spin configuration.Through a simplified schematic view of the domain structure,a semiclassical theory that captures the essential dynamics of the system is presented,and the coherent spin mixing dynamics can be understood in terms of oscillation in the phase space diagram.Using the phase diagram analysis method,we identify new phases,including theπphase oscillation and the running phase for the spin-imbalanced ferromagnetic spinor BEC.