Traffic dynamics on layered complex networks

To minimize traffic congestion, understanding how traffic dynamics depend on network structure is necessary. Many real-world complex systems can be described as multilayer structures. In this paper, we introduce the idea of layers to establish a traffic model of two-layer complex networks. By comparing different two-layer complex networks based on random and scale-free networks, we find that the physical layer is much more important to the network capacity of two-layer complex networks than the logical layer. Two-layer complex networks with a homogeneous physical topology are found to be more tolerant to congestion. Moreover, simulation results show that the heterogeneity of logical and physical topologies makes the packet-delivery process of two-layer networks more efficient in the free-flow state, without the occurrence of traffic congestion.     

CO_2亚临界压力区物性的快速计算——基于马丁-侯方程的显式快速计算模型

基于马丁-侯方程,提出二氧化碳亚临界压力区具有统一形式的热力性质和传输特性的显式计算模型。显式形式保证了热物理性质计算的高速性和稳定性;同时所有热物性的计算模型形式统一,便于系统仿真的调用。以REFPROP7的计算结果作为数据源,对环保制冷剂中重要的工质二氧化碳的热物性在压力为三相点压力至临界压力,过热度0—200K,过冷度0—100K的数据范围内进行拟合,并将该计算模型与REFPROP7相应公式的计算结果和计算速度进行对比。对比结果表明,所有快速计算模型的总平均偏差小于0.7%,最大偏差小于12.928%;计算速度较REFPROP7提高了2个数量级。。     

Surface plasmon resonance sensors based on Ag-metalized nanolayer in microstructured optical fibers

Surface plasmon resonance sensors based on Ag-metalized nanolayer in microstructured optical fibers are theoretically analyzed by using finite element method (FEM). In our simulations we use Drude-Lorentz model to describe the metal dielectric constant. The numerical results show that the sensitivity of Ag-metalized SPR sensor could reach 1167 nm/RIU and corresponding resolution is 8.57×10⁻⁵ RIU. Compared to conventional Au-metalized SPR sensors the performance of our device is obviously better.     

Analysis of shallow spherical shell with circular base under eccentrically applied concentrated loads

In this paper,problems of a shallow sphericalshell with circular base under eccentrically appliedconcentrated loads are discussed.The solutions forsix cases of eccentrically applied concentrated loadsare given,namely:(1)Normal concentrated load,(2)Meridional tangential concentrated load,(3)Circumferential tangential concentrated load;(4)Concentrated moment in the tangential plane,(5)Concentrated moment in the meridional normalplane,(6)Concentrated moment in the circumferentialnormal plane.From the solutions of concentrated loads,thesolutions of distributed line loads in the form ofcosnθalong the circle are obtained.     

抗坏血酸钛对鱼类、贝类及无尾两栖类的毒性研究

抗坏血酸钛对鲢鱼、草鱼、金鱼及泥鳅的毒性都很低,其96h TLm值为1736～10930mg/l。（敏感性顺序:鲢鱼>草鱼>金鱼>泥鳅）抗坏血酸钛对湖螺的48h TLm值与对蟾蜍蝌蚪的96hTLm值分别为12847.2与1886.5mg/l。经皮下注射,抗坏血酸钛对中华大蟾蜍的LD50为2.87g/kg。微核试验表明,钛试     

江西柘林水库大型底栖动物群落结构

2012年8月至2013年4月对柘林水库大型底栖动物进行了4次调查,共采集到底栖动物32种,隶属3门18科31属,其中软体动物门12种、节肢动物门12种、环节动物门8种。优势种为中华颤蚓Tubifex sinicus。柘林水库大型底栖动物年平均密度为620.42ind./m2,年平均生物量为16.05g/m2。密度季节变化为春季高,夏季低,生物量季节变化为春季高,秋季低。库湾及库区底栖动物较为丰富。功能摄食群中撕食者、滤食者和收集者季节变化明显,刮食者与捕食者变化较为平稳。水库中底栖动物优势类群多为耐低氧的寡毛类。更多还原     

两斑块间具有非对称双向脉冲扩散的周期单种群模型

研究了两斑块间具有脉冲扩散的周期单种群模型。利用脉冲微分方程的比较原理和一些分析方法,得到了系统持久性的充分条件,然后利用Brouwer不动点理论和构造Lyapunov函数的方法,得到了系统正周期解全局渐近稳定的充分条件。     

有效点、弱有效点和真有效点的锥刻画

利用集合在某点的相依切锥、法向锥和可行方向锥等研究向量优化问题的有效点、 弱有效点和真有效点的特征,对局部有效点、局部弱有效点和局部真有效点与集合的各 锥之间的关系作了刻画.     

On the Action of a Groupoid on a Manifold

In this paper,some properties of reduction for symplectic F-spaces are discussed.The properties of stable subgroups are discussed.We find that the symplectic action of a symplectic groupoid on a symplectic manifold can induce a symplectic map between reduced symplectic manifolds.This symplectic action can be characterized by the action of its induced symplectic groupoid on a symplectic manifold.Lastly,we shall discuss Poisson reduction and give a Poisson reduction theorem.