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Phase diagram and thermal properties of strong-interaction matter

Physical Review D 2016年第9期93卷 094019-094019页

作者： Fei Gao Jing Chen Yu-Xin Liu Si-Xue Qin Craig D. Roberts Sebastian M. Schmidt Department of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Center for High Energy Physics Peking University Beijing 100871 China Division of Physics Argonne National Laboratory Argonne Illinois 60439 USA Institute for Advanced Simulation Forschungszentrum Jülich and JARA D-52425 Jülich Germany

We introduce a novel method for computing the (μ, T)-dependent pressure in continuum QCD, from which we obtain a complex phase diagram and predictions for thermal properties of the dressed-quark component of the syst... 详细信息

关键词： Finite temperature field theory Quark-gluon plasma Strong interaction Nonperturbative methods

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Distribution amplitudes of radially-excited π and K mesons

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Physical Review D 2016年第11期93卷 114033-114033页

作者： B.-L. Li L. Chang F. Gao C. D. Roberts S. M. Schmidt H.-S. Zong Department of Physics Nanjing University Nanjing Jiangsu 210093 China School of Physics Nankai University Tianjin 300071 China Department of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Physics Division Argonne National Laboratory Argonne Illinois 60439 USA Institute for Advanced Simulation Forschungszentrum Jülich and JARA D-52425 Jülich Germany State Key Laboratory of Theoretical Physics Institute of Theoretical Physics CAS Beijing 100190 China

A symmetry-preserving truncation of the two-body bound state problem in relativistic quantum field theory is used to compute the leading-twist parton distribution amplitudes (PDAs) for the first radial excitations of the π and K mesons. In common with ground states in these channels, the PDAs are found to be dilated with respect to the relevant conformal-limit form and skewed toward the heavier valence quark in asymmetric systems. In addition, the PDAs of radially excited pseudoscalar mesons are not positive definite, owing to the fact that dynamical chiral symmetry breaking (DCSB) forces the leptonic decay constant of such states to vanish in the chiral limit. These results highlight that DCSB is expressed visibly in every pseudoscalar meson constituted from light quarks. Hence, so long as its impact is empirically evident in the pseudoscalar members of a given spectrum level, it is unlikely that chiral symmetry is restored in any of the hadrons that populate this level.

关键词： Leptonic, semileptonic & radiative decays Quantum chromodynamics Exotic mesons Hadrons

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Measuring effects of different noises in a model using ISI-distance methods

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International Journal of Biomathematics 2015年第4期8卷 17-36页

作者： Jingyi Qu Rubin Wang Ying Du Tianjin Key Laboratory for Advanced Signal Processing College of Electronic Information EngineeringCivil Aviation University Tianjin 300300 P. R. China Institute for Cognitive Neurodynamics School of Science East China University of Science and Technology Shanghai 200237 P. R. China

This paper examines the effects of current and conductance noises in a minimal Hodgkin- Huxley type model of a cold receptor neuron. Current noise enters the membrane equation directly while conductance noise is propagated through the activation variables. Compared with common used interspike interval method, ISI-distance is a simple complementary approach to measure the different effects of current and conductance noises. ISI-distance extracts information from the interspike intervals by evaluating the ratio of instantaneous firing rates, which is parameter-free, time scale-independent and easy to visualize. simulation results show that the most significant differences between different noise implementations in a pacemaker-like tonic firing regime at the transition to chaotic burst discharges.

关键词： Neural spike train current and conductance noise ISI-distance cold receptormodel impulse pattern.

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Dual roles of hydroxyl radicals and effects of competition on ozonation kinetics of two phenazone-type pollutants

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Emerging Contaminants 2015年第1期1卷 2-7页

作者： Zhang, Siyu Zhao, Yue Yu, Gang Wang, Bin Huang, Jun Deng, Shubo State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment POPs Research Center Tsinghua University Beijing 100084 China Veolia Environment Joint Research Center for Advanced Technology Tsinghua University Beijing 100084 China Key Laboratory of Pollution Ecology and Environmental Engineering Institute of Applied Ecology Chinese Academy of Science Shenyang 110016 China

Ozonation has been proved to be a promising approach for eliminating emerging pollutants in wastewater. In previous studies, emerging pollutants including diverse pharmaceuticals were found to exhibit significantly different ozonation reactivity. However, how the structural differences of emerging pollutants determine ozonation reactivity and mechanisms are still ambiguous. In this work, ozonation of dimethylaminophenazone (DMP) and acetylaminophenazone (AAA) with the same parent structure of phenazone but different substitution groups was investigated, in order to probe influencing mechanisms of structural differences on ozonation reactivity. Results show that DMP reacts with ozone and HO[rad] almost 2 and 1 order of magnitude faster than AAA, respectively. At pH 8, HO[rad] accelerates ozonation of DMP, but decreases ozonation of AAA. Competition simultaneously decreases degradation rate of the two phenazones, but effects on AAA are more significant than that on DMP. According to theoretical calculation results, differences in ozonation reactivity and mechanisms of the two phenazones can be mainly attributed to different substitution groups. The dimethylamino group in the structure of DMP increases the ozonation reactivity of phenazone by increasing reaction orbital energies and altering reaction sites, while the acetylamino group in the structure of AAA decreases the reaction orbital energy and therefore lowers the reactivity. © 2015 The Authors

关键词： Competition Hydroxyl radical Ozonation Phenazone-type pollutants Substitution groups

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Anti-controlling Hopf-Hopf interaction bifurcations on Poincaré map of a three-degree-of-freedom vibro-impact system with clearance

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Zhendong Gongcheng Xuebao/Journal of Vibration Engineering 2015年第6期28卷 952-959页

作者： Xu, Hui-Dong Wen, Gui-Lin Wu, Xin Zhang, Si-Jin College of Mechanics Taiyuan University of Technology Taiyuan030024 China State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan University Changsha410082 China College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China Key Laboratory of Advanced Design and Simulation for Special Equipment Ministry of Education Hunan University Changsha410082 China

Anti-controlling Hopf-Hopf interaction bifurcation on Poincaré map in a three-degree-of-freedom vibratory system with clearance is addressed in this paper. Firstly, a six-dimensional Poincaré map of the vibro-impact system is established. As the analytical expressions of all eigenvalues of Jacobi matrix for six-dimensional map are unavailable, the classical critical criteria of Hopf-Hopf interaction bifurcation described by the properties of eigenvalues have a great limitation in obtaining control gains. Aiming at the limitation, a new bifurcation criterion including eigenvalue assignment, transversality condition and non-resonance condition is established. The established criteria are equivalent to the classical critical criteria, but they do not depend on eigenvalue computations of Jacobi matrix. Then, for the difficulty of implicit Poincaré map created by discontinuity of vibro-impact motions in anti-control design of bifurcation of the close-loop system, a linear feedback control method is developed. Finally, numerical simulation shows that a torus solution of Hopf-Hopf interaction bifurcation on Poincaré map is created in a desired parameter location and verifies theoretical analysis. © 2015, Nanjing University of Aeronautics an Astronautics. All right reserved.

关键词： Eigenvalues and eigenfunctions

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A parking management system based on background difference detecting algorithm

A parking management system based on background difference d...

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International Conference on Quality of Service in Heterogeneous Wired/Wireless Networks (QSHINE)

作者： Xiaoling Wu Yanwen Wang Hainan Chen Kangkang Liang Lei Shu Guangdong University of Technology China Information Technology Research Base of Civil Aviation Administration of China Civil Aviation University of China China Shenzhen Institutes of Advanced Technology China Guangzhou Institute of Advanced Technology Chinese Academy of Sciences China Guangdong Provincial Key Laboratory of Petrochemical Equipment Fault Diagnosis Guangdong University of Petrochemical Technology China

ISBN: (纸本)9781479982172

The number of vehicles in cities has increased dramatically due to rapid economic development. However, the infrastructure for accommodating these vehicles has grown relatively slow. Alleviating the pressure on the urban transport system and solving the `parking difficulty' problem have thus become hot topics recently. In this paper, an intelligent parking system based on geomagnetic field variations is presented to solve this problem. An algorithm which detects the presence of vehicles in parking spaces in a parking lot is designed and field test results are presented. Our results show that this system has an acceptably high accuracy with low cost, high feasibility, high efficiency and hence is recommended for wide use.

关键词： Cities and towns Generators Robustness Magnetic sensors Radiofrequency identification Accuracy

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Hybrid phase-locked loop with fast locking time and low spur in a 0.18-μm CMOS process

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Chinese Physics B 2014年第7期23卷 748-753页

作者：朱思衡司黎明郭超史君宇朱卫仁 Beijing Key Laboratory of Millimeter Wave and Terahertz Technology Department of Electronic Engineering School of Information and ElectronicsBeijing Institute of Technology Advanced Computing and Simulation Laboratory (AχL) Department of Electrical and Computer Systems EngineeringMonash University

We propose a novel hybrid phase-locked loop （PLL） architecture for overcoming the trade-off between fast locking time and low spur. To reduce the settling time and meanwhile suppress the reference spurs, we employ a wide-band single-path PLL and a narrow-band dual-path PLL in a transient state and a steady state, respectively, by changing the loop bandwidth according to the gain of voltage controlled oscillator （VCO） and the resister of the loop filter. The hybrid PLL is implemented in a 0.18-μm complementary metal oxide semiconductor （CMOS） process with a total die area of 1.4×0.46 mm2. The measured results exhibit a reference spur level of lower than -73 dB with a reference frequency of 10 MHz and a settling time of 20 μs with 40 MHz frequency jump at 2 GHz. The total power consumption of the hybrid PLL is less than 27 mW with a supply voltage of 1.8 V.

关键词： phase-locked loop （PLL） fast locking time low spur complementary metal oxide semiconductor（CMOS）

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An optimal time model for the DCV trajectory planning

An optimal time model for the DCV trajectory planning

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International Conference on Information and Automation (ICIA)

作者： Gang Mao Mingqian Du Yi Chen Xiuqing Yang Kun Wang Civil Aviation Logistics Technology Co. Ltd Chengdu Sichuan China Civil Aviation Logistics Technology Co. Ltd Chengdu Sichuan China Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology School of Mechanical Engineering Jiangnan University Wuxi China

An optimal time model for the path planning is proposed in this paper. In this model, the trajectory planning based on an optimal time which limited by the maximal velocity and acceleration. Considering the optimal time planning in the acceleration level, the velocity planning is divided into three segments, namely, acceleration segment, constant segment, and deceleration segment. Besides, we construct the optimal time model based on the simulations and engineering applications. At the end of this paper, simulation and experimental results are also shown to verify this optimal time model.

关键词： Planning Motion segmentation Acceleration Trajectory Splines (mathematics) Mathematical model

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Virtual geographic environment based coach passenger flow forecasting

Virtual geographic environment based coach passenger flow fo...

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IEEE International Conference on Computational Intelligence and Virtual Environments for Measurement Systems and Applications

作者： Zhihan Lv Xiaoming Li Jinxing Hu Ling Yin Baoyun Zhang Shengzhong Feng Shenzhen Institute of Advanced Technology(SIAT) Chinese Academy of Science Shenzhen Ministry of Land and Resources Key Laboratory of Urban Land Resources Monitoring and Simulation Shenzhen China Shenzhen Research Center of Digital City Engineering Shenzhen China Jining Institute of Advanced Technology(JIAT) Chinese Academy of Sciences Jining

ISBN: (纸本)9781479960934

There are lacks of integrated analysis and visual display of multiple real-time dynamic traffic information. This research proposed a deep research and application examples on this basis which is conducted in virtual geographic environment. Currently, there are many kinds of traffic passenger flow forecasting models, and the common models include regression forecasting model and time series prediction model. The coach passenger flow shows strong regularity and stability without long-term change trend, so this research adopts regression forecasting model to forecast the coach passenger flow.

关键词： Transportation Predictive models Junctions Cities and towns Three-dimensional displays Forecasting Data models

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Studies on thermal conductivity prediction of fiber reinforced material with microscopic structure identification 45th

Studies on thermal conductivity prediction of fiber reinforc...

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45th AIAA Thermophysics Conference, 2015

作者： Jiang, Hua Mao, Jun-Kui TU, Ze-Can Shen, Kai Song, Jin-Rong Guo, Wen Huang, Wei-Na College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Jiangsu Province Key Laboratory of Aerospace Power System NanjingJiangsu210016 China Collaborative Innovation Center for Advanced Aero-Engine Beijing100191 China College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics NanjingJiangsu210016 China Gas Turbine Establishment Aviation Industry Corporation of China ChengduSichuan610500 China

ISBN: (纸本)9781624103612

The aim of this article is to establish an innovative thermal conductivity prediction method based on microstructure features recognition. Digital image processing technology is applied to analyze electron micrograph of typical long fiber reinforced composites (FRC). A novel practice and the criteria of determining the critical size of Representative Volume Element(RVE) are proposed. The mean value and the standard deviation of equivalent thermal conductivity could be achieved，which can represent more real physical meanings due to considering the real random distribution of fibers. The thermal conductivity of a typical carbon fiber reinforced epoxy matrix was predicted by this novel method. Meanwhile laser flash experimental method was applied to get the equivalent the thermal conductivity. The results of calculation fit well with the measured value, the relative error is a 10.1%. © 2015, American Institute of Aeronautics and Astronautics Inc. All Rights Reserved.

关键词： Fiber reinforced plastics

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