排序方式: 共有74条查询结果,搜索用时 31 毫秒
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考虑网络外部性和规模不经济的影响,对捆绑手机供应链的决策展开研究.构建了捆绑手机供应链的分散决策模型和集中决策模型,并对模型进行了比较分析.研究表明:1)规模不经济系数会阻碍系统利润的增长,而网络外部性系数促进系统利润的增长.2)手机制造商或电信运营商主导系统时所获利润远高于其不主导系统时的情形.同时手机制造商主导系统时,系统的利润要高于电信运营商主导系统时的利润.3)在分散决策下,手机制造商和电信运营商的利润均未达到最优:集中决策下,合约机套餐价格较低,总的销量更高,系统的利润更高.通过“补贴联合收益共享”协调契约,可以实现手机制造商和电信运营商的收益最大化. 相似文献
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基于N-乙基咔唑-2-乙烯基-8-羟基喹啉锌的黄绿色有机电致发光器件的性能 总被引:3,自引:0,他引:3
通过用一种既具有空穴传输特性又具有发光特性的新型荧光染料N-乙基咔唑-2-乙烯基-8-羟基喹啉锌((E)-2-(2-(9-ethyl-9H-carbazol-3-yl)vinyl) quinolato-zinc, CzHQZn)作为受主, 制备了结构为ITO/2T-NATA (30 nm)/CBP: 6%Ir(ppy)3:wCzHQZn(20 nm)/Alq3(50 nm)/LiF/Al(ITO: indium-tin oxide, 2T-NATA: 4,4',4'-{N,N-(2-naphthyl)-N-phenylamino}-triphenylamine, CBP: 4,4-N,N'-dicarbazole-biphenyl, Ir(ppy)3: factris (2-phenylpyridine) iridium, Alq3: tris(8-quinolinolato) aluminum; w 是CzHQZn 的质量分数)的黄绿色有机电致发光器件(OLEDs). 研究了掺杂体系在不同掺杂浓度(w=5%、10%、12%、15%)时的电致发光(EL)特性. 结果表明, CzHQZn 掺杂浓度为10%的器件在11 V 电压下实现了黄绿光发射, 色坐标为(0.4045, 0.5113), 最大发光亮度为16110 cd·m-2; 而在7 V电压下的最大发光效率为2.19 cd·A-1, 最大外量子效率为0.775%. 相似文献
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In the paper the nonlinear dynamic equation of a harmonically forced elliptic plate is derived, with the effects of large
deflection of plate and thermoelasticity taken into account. The Melnikov function method is used to give the critical condition
for chaotic motion. A demonstrative example is discussed through the Poincaré mapping, phase portrait and time history. Finally
the path to chaotic motion is also discussed. Through the theoretical analysis and numerical computation some beneficial conclusions
are obtained.
Foundation item: the National natural Science Foundation of China (19672038); the Natural Science Foundation of Shanxi Provence (1880342). 相似文献
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Anomalous dynamics response of nonlinear elastic bar 总被引:1,自引:0,他引:1
IntroductionInresentyears,thechaoticbehaviorofbeamssubjectedtoperiodicloadbringsmoreandmorescholars’interests.In 1 983 ,FCMoonetal.[1]studiedthechaoticmotionsofbeamsinnonlinearboundaryconditions.In 1 994 ,S .AnanthaRamuandTSSankaretal.[2 ]analyzedbifurcationandCata… 相似文献
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A fractional order hyperchaotic system derived from a Liu system and its circuit realization 下载免费PDF全文
In this paper we propose a novel four-dimensional fractional order hyperchaotic system derived from a Liu system.Electronics workbench(EWB) and Matlab simulations show the dynamical behavior of the proposed four-dimensional fractional order hyperchaotic system.Finally,after separately using EWB and Matlab,an electronic circuit is designed to realize the novel four-dimensional fractional order hyperchaotic system and the experimental circuit results are obtained which are identical to software simulations. 相似文献