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OALib Journal期刊

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Spatiotemporal modulation induced coexistence of meandering spiral wave and travelling spiral wave
时空调制引起的漫游螺旋波与旅行螺旋波共存现象

Qian Yu,<br>
物理学报 , 2013,
Abstract: Spiral dynamics induced by spatiotemporal modulation is investigated in the generic excitable Barkley model. The coexistence of meandering spiral wave and travelling spiral wave in the same medium is discovered under proper spatiotemporal modulation. The underlying mechanism behind this coexistence phenomenon is analyzed. And the two necessary conditions which are needed to observe the coexistence of meandering spiral wave and travelling spiral wave in the excitable Barkley model are discussed.
Turbulence synchronization and suppression by coupling in excitable media
可激发介质湍流的耦合同步及控制

Qian Yu,Song Xuan-Yu,Shi Wei,Chen Guang-Zhi,Xue Yu,<br>,宋宣玉,时伟,陈光旨,
物理学报 , 2006,
Abstract: The turbulence synchronization is achieved in the excitable media via the mutual coupling method, the coupling coefficient is given and the largest transverse Lyapunov exponent is calculated. Turbulence is suppressed in two ways by coupling with two systems in different states.
基于微分动态逻辑的铁路道口控制分析
磊?,文生?
计算机科学 , 2013,
Abstract: 利用微分动态逻辑对铁路道口控制进行形式化分析与建模。在火车从发送接近信号到进入道口的运动过程中,根据火车到达道口时间上的要求,将火车速度控制问题抽象成一个混成系统的安全性性质,用微分动态逻辑来描述,并使用混成系统证明工具keymaera对系统的安全性进行验证,以实现对火车进入道口前速度的正确控制。
Analysis of genetic diversity of three geographic populations of Pomacea canaliculata by AFLP
福寿螺3个地理群体遗传多样性的AFLP分析

xu jianrong,<br>徐建荣,韩晓磊,李宁,建锋,春花,包振民
生态学报 , 2009,
Abstract: 应用AFLP分子标记技术对我国江苏苏州、福建漳州和广东珠海3个地理群体福寿螺进行了遗传多样性分析.8对选择性引物在3个群体的90个个体中,共扩增出382个位点,多态位点369个.江苏、福建和广东3个福寿螺群体的多态位点比率和Shannon's指数分别为84.82%、85.08%、79.06%,0.4259、0.4308、0.4079;表明3个群体遗传多样性在同一水平上.不同地理来源的福寿螺个体归群分析聚成3类,与地理分布一致,表明3个地理群体间已出现遗传分化,广东群体和福建群体首先聚在一起,再与江苏群体聚类.Shannon's指数和AMOVA分析估算均显示福寿螺的遗传变异主要来自于群体内个体间.综上所述,3个福寿螺群体具有丰富的遗传多样性而且已形成相对独立的遗传结构;并找到了3个群体间遗传特异性AFLP标记,可用于群体间分子鉴定和辅助分类.
Study of Modulation Spectrum of Semiconductor Quantum Wells
半导体量子阱材料的调制光谱研究

Qian Shixiong/,<br>士雄,袁述,吴建耀,,T.G.Andersson
半导体学报 , 1991,
Abstract: Using the phototransmission spectrum technique, we have measured the phototransmissionspectra from In_xGa_(1-x)As/GaAs single quantum well samples.The clear modulation structureof different excitons in InGaAs well has been got. From the fitting based on the electric field-modulation mechanism,the exciton energies have been obtained which are in good agreementwith other measurements and theoretical calculation.
液相色谱-质谱联用分析紫杉醇和多西他赛中流动相体系的优化
,韵秋
复旦学报(医学版) , 2012, DOI: 10.3969/j.issn.16728467.2012.06.011
Abstract: 目的分别通过质谱的两种进样方式——直接进样和色谱进样,考察并比较两种进样方式、不同添加剂条件下紫杉醇和多西他赛的离子化规律。方法将含有不同添加剂的紫杉醇和多西他赛混合溶液分别通过针泵或液相系统导入电喷雾电离源进行质谱检测,获取待测化合物的质谱图或色谱图。研究溶液或流动相中添加剂的种类、浓度、pH值对紫杉醇和多西他赛离子化效率的影响。结果两种进样方式所呈现的待测化合物质谱响应的变化情况一致,均以1mmol/L甲酸铵溶液(pH6.5)为添加剂所展现的离子化效率最高、响应强度最大。结论在建立紫杉醇或多西他赛的液相色谱质谱联用(LC-MS/MS)定量方法时,采用质谱直接进样方式对流动相中的水相组成进行优化的方法是高效、便捷和可靠的。在此基础上建立的人血浆中紫杉醇浓度的LC-MS/MS分析方法,经方法学验证表明灵敏度高、结果重现性好。
基于aadl的无线传感器网络的建模与分析
,文生,朱明华?
计算机科学 , 2012,
Abstract: 利用结构分析与设计语言aadi_(architccturcanalysisanddcsignlanguagc)对无线传感器网络进行建模,并对其中一个节点进行了详细的分析。介绍aadl语言以及它在嵌入式系统中建模的优势,展示了无线传感器网络的特征和关键技术。结合aadl,针对温度传感器案例,对温度传感器的结构及功能进行了详细描述,充分体现了此传感器节点的工作原理与内部结构,有助于提高其结构上的可改进性和扩展性,以进一步应用到传感器网络中。
A car-following model with stochastically considering the relative velocity in a traffic flow
随机计及相对速度的交通流跟驰模型

Xue Yu,<br>薛
物理学报 , 2003,
Abstract: In this paper, the car-following model with stochastically considering the relative velocity in a traffic flow is presented through investigating the vehicle a cceleration process with uncertainty. The stability criterion superior to the Ba ndo's model is derived by the linear stability analysis. The density wave is inv estigated analytically with the perturbation method. The results show that the o ccurrence of traffic jamming transitions can be described by the kink solution o f the modified Korteweg-de Vries equation. The effects of stochastic relative ve locity on the traffic flow are simulated and analyzed. It is shown that the chan ge rate of velocity in the new model is smaller than that of the Bando's model u nder the same condition and depends on the probability p. As the probability p i ncreases, a small initial disturbance does not magnify and influence on the traf fic flow, but fades away for a long time. The stable region in the new model is larger than in the Bando's model in the phase diagram. The existent initial hyst eresis in the new model will approach to a small region with the increase of tim e in the headway-velocity plot, which is exactly different from that in the Band o's model.In contrast,the hysteresis region in Bando's model will be continuousl y extended to cause traffic flow instability.
Lattice models of the optimal traffic current
优化车流的交通流格子模型

Xue Yu,<br>薛
物理学报 , 2004,
Abstract: Based on the lattice model of traffic flow, the lattice models which consider the next-nearest-neighbour flow on traffic and pay attention to the following vehicle as well as the preceding vehicle are presented, respectively. The stability criterion is derived by the linear stability analysis. The evolution of density wave has been investigated analytically with the perturbation method. The results show that the occurrence of traffic jamming transitions is described by the kink solution of the modified KdV equation. The theoretical results are in good agreement with the simulation. Moreover, the simulation indicates that the lattice models considering the next-nearest-neighbour interaction can stabilize the traffic flow, but the other model is just in opposition to the former model.
Multivariable Generalized Predictive Control and Its Application in Investment Decision
多变量广义预测控制及其在投资决策中的应用

Jin Yuanyu,<br>金元
系统工程理论与实践 , 1992,
Abstract: The multivariable predictive Control proposed by kinnaert is based on multistep optimazation. It overcome the weaknesses of the minimum variance control which is based on one-step optimization, but its algorithm is complex and computational effort is great1] . We modifiea kinnaerts algorithm , . In this Paper, We modified furacteristies of the economic systems, so it furnishea effictive decision schemes for multivariabit economic systems.
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