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本文以一维均匀环为基础, 通过添加有限数量的长程连接构造出了一维有限能量约束下的空间网络, 环上任意节点i与j之间存在一条长程连接的概率满足pijα dij-α (α≥ 0),其中dij为节点i与j之间的网格距离, 并且所有长程连接长度总和受到总能量∧=cN(c≥ 0)的约束, N为网络节点总数.通过研究该空间网络上的随机游走过程,存在最优幂指数α0 使得陷阱问题的平均首达时间最短.进一步研究发现,平均首达时间与网络规模N之间存在着幂律关系, 随着网络规模N和总能量∧的增加,最优幂指数α0单调增加,并趋近最优值1.5. 相似文献
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THECALCULATIONOFEIGENVALUESFORTHESTATIONARYPERTURBATIONOFCOUETTE-POISEUILLEFLOWSongJinbao(宋金宝)ChenJianning(陈建宁)(ReceivedDec.3... 相似文献
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Detection resolution is crucial for improvement of the measurement precision in the device and instrument. Because of the limited resolution, a fuzzy area with the truth-value as its center is found during the detection. The finding for improving the measurement precision by the border of fuzzy area is first introduced. The higher resolution can be captured by the higher resolution stability which makes the different detection results of the inner and outer fuzzy area on the border reflected more sensitively between the measure and the reference quantity. The system resolution obtained only depends on the stability of measurement resolution, which is much better than the mea~surement resolution itself. Based on the finding, the measurement precision can be improved two or three orders of magnitude. The finding can be used in various kinds of high precision measurement. 相似文献
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Pure blue and white light electroluminescence in a multilayer organic light-emitting diode using a new blue emitter
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We characterized the 6,12-bis{[N-(3,4-dimethylphenyl)-N-(2,4,5-trimethylphenyl)]amino} chrysene (BmPAC), which has been proven to be a blue fluorescent emission with high EL efficiency. The blue fluorescent device exhibits good performance with an external quantum efficiency of 5.8% and current efficiency of 8.9 cd/A, respectively. Using BmPAC, we also demonstrate a hybrid phosphorescence/fluorescence white organic light-emitting device (WOLED) with high efficiency of 36.3 cd/A. In order to improve the relative intensity of blue light, we plus a blue light-emitting layer (BEML) in front of the orange light emitting layer (YEML) to take advantage of the excess singlet excitons. With the new emitting layer of BEML/YEML/BEML, we demonstrate the fluorescence/phosphorescence/fluorescence WOLED exhibits good performance with a current efficiency of 47 cd/A and an enhanced relative intensity of blue light. 相似文献
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人们在学习的时候,经常是记住了这个又忘记了那个。如果把一些知识把它们串起来,就可加深记忆。把知识点串起来的方法很多,现在以热力学的内容为例,介绍一下如何采用顺口溜的方式将知识点串在一起。 相似文献
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本文考虑的问题是二维粘性渠流,对0到2000之间的雷诺数,计算了平稳扰动的Couette-Poiseuille流的下游特征值,其特征方程类似于Orr-Sommerfeld方程,所用的方法是谱方法和初值方法(复合矩阵方法),就几种有趣的流量,给出了相应的特征值的计算结果,这些特征值确定了扰动的衰减率。 相似文献
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最近,Li等研究了在Kleinberg导航模型中引入总能量/l=cⅣ约束后的最优导航问题,其中4为网络中所有长程连边的长度之和,C为正常数,Ⅳ为网络节点总数.他们通过在1维和2维导航模型中的模拟结果推测,在有限能量约束下Kleinberg导航模型中按照幂律方式添加长程连边的最优幂指数应该是α=d+1,其中d为导航模型的维数.本文在平均场理论下,建立了2维有限能量约束下的导航过程的动态微分方程,通过对该方程进行数学分析以及数值求解,从理论上证明了当网络规模足够大且总能量相对较小时,2维有限能量约束下的最优导航幂指数确实为α=3,这一结果证实了Li等之前的推测. 相似文献