基于分形耦合结构的微带带通滤波器设计

设计了一个中心频率为2GHz的传统结构的微带阶梯耦合带通滤波器,采用分形耦合结构进行谐波抑制,仿真结果表明:采用分形耦合单元比传统结构的耦合单元使滤波器二次谐波减小了25dB,通带插入损耗小于-0.55dB;通过对分形耦合单元进行优化,可使滤波器二次谐波抑制性能进一步改善37dB,而通带性能几乎不受影响。测量结果与仿真结果基本吻合。

内燃机进排气系统流动计算的分形耦合贴体网格的设计

阐述内燃机进排气系统分形耦合椭圆型贴体网格生成的方法，并应用这一方法按照多维流动计算的要求对YC6105柴油机进排气管进行了贴体网格设计计算。其结果表明，该方法不仅适用于结构形状复杂的内燃机进排气系统，而且可推广应用于其它结构形状复杂的流场，对提高可压流体流动计算的精度大有裨益。

MPC 增压系统正交全三维分形耦合贴体网格生成

阐述了ＭＰＣ增压系统多分支、变曲率、变截面管系的流动计算的正交全三维分形耦合贴体网格的生成方法。应用这一方法编制计算程序，对一ＭＰＣ模块进行了网格构筑，其计算结果表明，这种方法生成的网格能满足流动计算中气动方程差分求解的要求，是一种较完备的网格生成方法。

投资者反馈交易视角下证券流动性多重分形波动的内在机理分析

针对证券流动性存在多重分形波动特征但鲜有成果探究其内在机理的背景下,本文基于投资者普遍采用正反馈和负反馈交易行为的客观事实,从投资者交易行为出发,结合分形市场假说,独辟蹊径地构建了分形耦合少数-多数派博弈(fractal coupling minority-majority game,FCMMG)模型,推演出投资者在正反馈和负反馈交易策略行为间的动态多样化选择驱使着证券流动性的多重分形波动。在此基础上,通过实证发现,仿真流动性具有多重分形波动特征,使用FCMMG解释证券流动性呈现多重分形波动特征具有合理性和有效性。研究结果既为探究证券流动性多重分形波动特征开拓了视角,也为利用证券流动性的多重分形波动进行风险预警奠定了基础。

Convex Variational Formulation with Smooth Coupling for Multicomponent Signal Decomposition and Recovery

A convex variational formulation is proposed to solve multicomponent signal processing problems in Hilbert spaces.The cost function consists of a separable term, in which each component is modeled through its own potential,and of a coupling term, in which constraints on linear transformations of the components are penalized with smooth functionals.An algorithm with guaranteed weak convergence to a solution to the problem is provided.Various multicomponent signal decomposition and recovery applications are discussed.

Splitting and Restoration of Kondo Peak in a Deformed Molecule Quantum Dot Coupled to Ferromagnetic Electrodes

We adopt the nonequilibrium Green＇s function method to theoretically study the Kondo effect in a deformed molecule, which is treated as an electron-phonon interaction （EPI） system. The self-energy for phonon part is calculated in the standard many-body diagrammatic expansion up to the second order in EPI strength. We find that the multiple phonon-assisted Kondo satellites arise besides the usual Kondo resonance. In the antiparallel magnetic configuration the splitting of main Kondo peak and phonon-assisted satellites only happen for asymmetrical dot-lead couplings, but it is free from the symmetry for the parallel magnetic configuration. The EPI strength and vibrational frequency can enhance the spin splitting of both main Kondo and satellites. It is shown that the suppressed zero-bias Kondo resonance can be restored by applying an external magnetic field, whose magnitude is dependent on the phononic effect remarkably. Although the asymmetry in tunnel coupling has no contribution to the restoration of spin splitting of Kondo peak, it can shrink the external field needed to switch tunneling magnetoresistance ratio between large negative dip and large positive peak.

OPTIMAL DESIGN OF SMART ANTENNA ARRAY

This letter investigates an efficient design procedure integrating the Genetic Algorithm (GA) with the Finite Difference Time Domain (FDTD) for the fast optimal design of Smart Antenna Arrays (SAA). The FDTD is used to analyze SAA with mutual coupling. Then,on the basis of the Maximal Signal to Noise Ratio (MSNR) criteria, the GA is applied to the optimization of weighting elements and structure of SAA. Finally, the effectiveness of the analysis is evaluated by experimental antenna arrays.

Upper Triangular Matrix of Lie Algebra and a New Discrete Integrable Coupling System

The upper triangular matrix of Lie algebra is used to construct integrable couplings of discrete solition equations. Correspondingly, a feasible way to construct integrable couplings is presented. A nonlinear lattice soliton equation spectral problem is obtained and leads to a novel hierarchy of the nonlinear lattice equation hierarchy. It indicates that the study of integrable couplings using upper triangular matrix of Lie algebra is an important step towards constructing integrable systems.

Coupling analysis-based false monitoring information identification of production system in process industry

False monitoring information is a major problem in process production system and several ineffective methods have been proposed to identify false monitoring information in the production system. In this paper, a new method is proposed to identify false monitoring information based on system coupling analysis and collision detection from the perspective of data analysis. Coupling multifractal features are extracted to reflect the changes in coupling relationship by utilizing the multifractal detrended cross-correlation analysis (MF-DXA). Each monitoring variable in process production system has more than one coupled variable, which can be regarded as multi-source. To achieve low redundancy in features and uniform description of coupling relationship, the feature level information fusion is studied based on modified Mahalanobis Taguchi system (MTS). False alarms are identified when the coupling relationships among the coupled monitoring variables collide. Analysis results of coupled R?ssler and Henon datasets indicate the feasibility of this method for selecting the effective coupling feature and uniform description of coupling relationship. The compressor system case of Coal Chemical Ltd. Group is studied and false monitoring information is identified.

Land Use Effects on the Distribution and Speciation of Heavy Metals and Arsenic in Coastal Soils on Chongming Island in the Yangtze River Estuary, China

The reclamation of tidal fiats has been one of the important approaches to replenish the arable lands in the coastal areas; pollution status of reclaimed soils has received wide attention recently, especially for the study of heavy metals due to the relative high pollutant concentrations in wetlands. To understand the impact of land use change on heavy metal and arsenic （As） geochemistry by the reclamation of wetlands for agriculture, surface soils and soil profiles were collected from the agricultural land reclaimed in the 1990s and the intertidal flat wetland at Dongtan on Chongming Island in the Yangtze River Estuary, China. The soil samples were analyzed for total concentrations and chemical speciation of chromium （Cr）, zinc （Zn）, copper （Cu）, lead （Pb）, nickel （Ni）, cadmium （Cd） and As using inductively coupled plasma mass spectrometry （ICP-MS）. Results showed that soil properties （salinity, total organic carbon and grain-size distribution） and the concentrations of heavy metals and As in the soils differed under the different land use types. The conversion of wetland to forest had caused obvious losses of all the measured heavy metals. In paddy field and dryland with frequent cultivation, the concentrations of Cr, Zn, Cu, Ni and As were higher when compared to forest land which was disturbed rarely by human activities. Speciation analysis showed that Cr, Zn, Cu, Ni and As were predominated by the immobile residual fraction, while Pb and Cd showed relatively higher mobility. In general, metal （except Ni） and As mobility decreased in the following order： wetland 〉 dryland 〉 paddy field 〉 forest land, which suggested that the reclaimed soils had lower metal and As mobility than the intertidal fiat wetland. The results of this study contribute to a better understanding of the effects of land use on heavy metals and As in the reclaimed soils of the study area and other similar coastal areas.