Relative entropy of entanglement of two-qubit ’X’ states

Two closest single-qubit states could be diagonalised by the same unitary matrix,which helps to find the relative entropy of entanglement of a two-qubit ’X’ state.We formulate two binary equations for the relative entropy of entanglement and the corresponding closest separable state of a given two-qubit ’X’ state.This approach can be applied to get the relative entropy of entanglement of many widely-discussed two-qubit states,such as pure states,Werner states,and so on.     

Thermodynamic Performance Characteristics of a Brownian Microscopic Heat Engine Driven by Discrete and Periodic Temperature Field

A Brownian microscopic heat engine with a particle hopping on a one-dimensional lattice driven by a discrete and periodic temperature field in a periodic sawtooth potential is investigated. In order to clarify the underlying physical pictures of the heat engine, the heat flow via the potential energy and the kinetic energy of the particles are considered simultaneously. Based on describing the jumps among the three states, the expressions of the efficiency and power output of the heat engine are derived analytically. The general performance characteristic curves are plotted by numerical calculation. It is found that the power output-efficiency curve is a loop-shaped one, which is similar to one for a real irreversible heat engine. The influence of the ratio of the temperature of the hot and cold reservoirs and the sawtooth potential on the maximum efficiency and power output is analyzed for some given parameters. When the heat flows via the kinetic energy is neglected, the power output-efficiency curve is an open-shaped one, which is similar to one for an endroeversible heat engine.     

四能级量子制冷循环

本文提出以两个qubit量子纠缠系统为工质的四能级制冷循环模型, 基于量子热力学第一定律和热纠缠概念, 分析了在循环中系统与外界交换的热量、输入功、制冷系数等热力学参数与量子纠缠之间的关系, 结果表明: 制冷系数等高线图是环状曲线, 随纠缠比r增加而非单调变化; 当相互作用常数J比较小时, 量子制冷机运行区间在c₁>c₂, 当增加J值时, 制冷机运行区间在c₁>c₂和 c₁<c₂两个区域; 最大制冷系数ε_max随J值增大而增加.     

德治中国——由先秦儒家传统行政伦理思想看到的

以先秦儒家为代表的中国古代德治思想理论,是中国封建社会基本的治国方针,在长达两千年之久的封建社会中起着重大的作用。儒家不仅十分重视以德治政、以德治官和官德的建设。而且对官德建设的内容、目标和途径等均有相当完备而系统的论述和阐释。本文从先秦儒家的传统行政伦理视角出发,阐述了现代行政管理人员如何提高自身行政道德素养的问题。     

非线性二极管系统构成的不可逆热机性能特征分析

研究了一个非线性二极管系统构成的不可逆热机的性能,它是由分别处于两个温度不同的热库中,完全相同的两个非线性二极管反向连接后并联上一个电容器组成的.运用非线性系统涨落理论计算出从两个热库中吸收的热流,考虑热漏损失后得出热机的功率和效率.通过数值模拟可以绘出热机的性能特征曲线以及优化性能参数随两热库温度比等主要参量的特征曲线.分析了二极管的非线性强度、热漏损失和温度比对热机性能特性的影响.最后,讨论了理想二极管热机的性能特征.     

Kerr介质中单模平衡辐射场与耦合双原子Raman相互作用的光场压缩效应

利用全量子理论，研究了在Kerr介质中单模热辐射场与耦合双原子Raman相互作用过程中的光场压缩效应。结果表明：Kerr介质肛的加入将破坏系统的非经典性质，使系统的非线性性质加强；研究结果还揭示了初始场强度二、原子间耦合系数g以及原子的初始状态（θ，φ）对光场压缩效应的影响。     

Entangled quantum heat engine based on two-qubit Heisenberg XY model

Based on a two-qubit isotropic Heisenberg XY model under a constant external magnetic field,we construct a four-level entangled quantum heat engine(QHE).The expressions for the heat transferred,the work,and the efficiency are derived.Moreover,the influence of the entanglement on the thermodynamic quantities is investigated analytically and numerically.Several interesting features of the variations of the heat transferred,the work,and the efficiency with the concurrences of the thermal entanglement of two different thermal equilibrium states in zero and nonzero magnetic fields are obtained.     

不可逆谐振子量子奥托制冷循环性能特征南昌大学理学院物理系，南昌330031

建立了以谐振子系统为工质的量子奥托制冷循环模型，基于海森堡量子主方程，推导出谐振子系统热力学可观测量的运动方程，得到了量子奥托制冷循环的模拟图．数值分析了平均摩擦功率、制冷率、制冷系数和输入功率与绝热过程时间的关系．进一步分析了热传导和等频率过程时间对循环性能参数的影响．     

成都市城东道路灰尘中典型多环芳烃的液相色谱测定及其来源分析

城市道路灰尘中的多环芳烃在一定程度上可以反映邻近区域多环芳烃的排放情况。作者采用超声波溶剂提取、自制硅胶层析柱净化和高效液相色谱分离,建立了城市道路灰尘中菲和蒽、荧蒽和芘、苯并[a]蒽和等3对多环芳烃同分异构体的分离分析方法。该方法精密度优于4%,检出限(质量分数)为(1.6~4.7)×10-9,回收率为72%~92%。用该方法测定了成都市城东不同功能区道路中6种多环芳烃的含量,总质量分数在(1.57~7.15)×10-6。多环芳烃含量分布表明人口密集、工业活动及交通要道等功能区道路灰尘中多环芳烃含量高。源解析结果显示研究区道路灰尘中多环芳烃主要来源于附近的石油、机动车尾气和有机物质燃烧。