基于偏振成像技术的目标探测研究进展及分析

简述了利用偏振成像技术进行目标探测的物理特性,介绍了偏振成像技术的应用优点,概括分析了我国利用偏振成像技术进行目标探测的发展状况,指出了发展中存在的问题,叙述了国外在该研究方向所取得的主要成就。总结分析了基于偏振成像技术的目标探测的研究进展,并对其未来发展方向进行了展望。     

利用双面腔制备n原子GHZ态

提出了一种利用双面腔制备多原子GHZ态的方法.当腔中囚禁原子处于特定态时,腔可能反射入射的单光子脉冲,也可能透射它.这个特性可以引起囚禁原子和输入腔肠的纠缠.数值模拟显示制备的多原子GHZ态具有很高的保真度和成功率.而且原子自发辐射等内禀噪声只对成功率有影响,而对保真度几乎没有影响.另外,对高Q腔和原子的L-D条件的不要求,提升了试验实现的可行性.     

气液耦合振动对热声发动机性能的影响

进行了气液耦合振动驻波型热声发动机定量模拟.重点比较分析了单纯气体振动系统和引入[EMIM][BF_4]室温离子液体作为液体活塞的气液耦合振动系统的运行参数,并考察了液体活塞的质量对热声发动机谐振频率、压力振幅以及板叠热端温度等的影响.     

金属载氧体可持续循环能力特性研究

在化学链燃烧技术中,可持续循环能力是判断载氧体性质优劣的一个非常重要的指标,决定载氧体的使用寿命和经济性.分别利用热天平、SEM、XRD实验研究了Fe和Cu基载氧体的持续循环能力.实验数据表明,制备后的金属载氧体无论是反应速率还是可持续循环能力都得到了大幅度提升;Fe基载氧体较Cu基载氧体具有更好的可持续循环能力.     

丙烷-氢气-空气预混层流燃烧特性研究

利用高速纹影摄像法和球型发展火焰研究了常温常压下丙烷-氢气-空气预混层流燃烧特性,获得了不同氢气体积分数和当量比下混合气的层流燃烧速率、Markstein数、Zeldovich数和Lewis数.结果表明:随着氢气比例的提高,层流燃烧速率增加,火焰厚度降低;当氢气体积分数小于60%时,随着当量比的增加,Markstein数降低,当氢气体积分数大于60%时,随着当量比的增加,Markstein数增加.当量比小于1.2时,随着氢气比例增加,Markstein数降低.当量比大于1.2时,随着氢气比例增加,Markstein数增加.随着氢气比例的增加,Zeldovich数降低,全局Lewis数降低.     

纱线飞行的理论分析与试验研究

主喷嘴是喷气织机引纬系统的重要部件,将纱线速度从零提高到正常引纬速度.本文从理论上推导纱线在主喷嘴出口处速度的计算公式,通过搭建测试实验台及借助粒子图像测速技术,获得主喷嘴出口气场,实测不同纱线的飞行速度,分析比较理论值和实测值的差异,并讨论分析影响纱线飞行速度的主要因素.     

Influence of angular momentum in axially symmetric potentials with octupole deformation

The chaotic classical single-particle motion in an oblate octupole deformed potential with a nonzero z-component of angular momentum Lz is investigated. The stability analysis of the trajectories shows that with increasing rotation of the system, the unstable negative curvature regions of the effective potential surface decrease, which converts the chaotic motion of the system into a regular one.     

Temperature Insensitivity of Optical Properties of InAs/GaAs Quantum Dots due to a Pregrown InGaAs Quantum Well

Both the peak position and linewidth in the photoluminescence spectrum of the InAs/GaAs quantum dots usually vary in an anomalous way with increasing temperature. Such anomalous optical behaviour is eliminated by inserting an In0.2Ga0.8As quantum well below the quantum dot layer in molecular beam epitaxy. The insensitivity of the photoluminescence spectra to temperature is explained in terms of the effective carrier redistribution between quantum dots through the In0.2Ga0.8As quantum well.     

Influence of Oxygen Vacancy on Transport Property in Perovskite Oxide Heterostructures

Effect of oxygen vacancy on transport property of perovskite microstructures is studied theoretically. Compared with calculated and measured I-V curves, it is revealed that electron conduction plays an important role in the oxygen nonstoichiometry perovskite heterostructures even with hole-doped or un-doped material due to the oxygen vacancies. In addition, a detailed understanding of the influence of oxygen vacancy concentration and temperature on the conduction characteristics of oxide heterojunction with both forward and reverse biases is obtained by calculation.     

Acceptor Concentration Effects on Photovoltaic Response in the La1-xSrxMnO3/SrNbyTi1-yO3 Heterojunction

Photovoltaic response in the heterojunction of La1-x SrxMnO3/SrNby Ti1-yO3 （LSMO/SNTO） is analyzed theoretically based on the drift-diffusion model. It is found that the decrease of acceptor concentration in the La1-xSrxMnO3 layer of hereto junction can increase the peak value of photovoltaic signal and the speed of photovoltaic response, whereas the changing of donor concentration in the SrNby Ti1-yO3 layer has no such evident effect. Furthermore, the result also indicates that the modulation of Sr doping in La1-xSrxMnO3 is an effective method to accommodate the sensitivity and the speed of photovoltaic response for LSMO/SNTO photoelectric devices.