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Observation of Dynamic Behavior in YBa2CuaO7-o/La0.88Ca0.12 MnOa Using Femtosecond Optical Pulses 下载免费PDF全文
Ultrafast pump-optical probe spectroscopy is used to analyze the carrier dynamic behavior in YBa2 Cua 07-o/La0.88 Ca0.12Mn03 (YBCO/LCMO) heterostructure. The change in reflectivity AR/R is induced and is probed by us- ing pulses of 12Ors duration and photon energy 1.55eV from a Ti:sapphire laser. For higher laser power fluence (such as 0.5 mJ/cm^2), the time evolution in transient reflectivity change △R/R exhibits three long relaxation processes. We extract the characteristic relaxation time of the different processes by fitting the data and obtain the long characteristic relaxation time which indicates the enhanced proximity effect of the YBCO/LCMO. 相似文献
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在一种改进的Nagel-Schrekenberg元胞自动机交通流模型的基础上,提出一个高速公路双车 道元胞自动机模型来模拟开放性边界条件下的车流运动,并考虑两车道之间左边界开放程度 的比例系数α及车辆加减速概率p的影响.计算机数值模拟结果表明,在车流状态的演化过程 中,通过确定车道耦合系数b来控制车流量,不同的b值车流量不同,对车辆运动出现堵塞项 的相变点有影响.
关键词:
元胞自动机
交通流模型
耦合效应 相似文献
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