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Dependence of Dilepton Production in the Baryon-Rich Quark-Gluon Fireball on the Initial Temperature

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Chinese Physics Letters 1997年第1期14卷 24-27页

作者： HE Ze-jun zhang jia-ju QIU Xi-jun CCAST(World Laboratory) P.O.Box 8730Beijing 100080 Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800

In the study of dilepton production of a baryon-rich quark-gluon fireball based on the full stopping scenario via a relativistic hydrodynamic model,it is found that for the fixed initial baryon chemical potential with increasing initial temperature a peak indicating the formation of the baryon-rich quark-gluon matter appears in the total dilepton yield.

关键词： quark lepton relativistic

Intermediate Mass Dilepton Production in a Chemically Equilibrating Quark-Gluon Matter

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Chinese Physics Letters 2001年第10期18卷 1331-1333页

作者： HE Ze-jun ZHOU Wen-Jie zhang jia-ju LIU Bo Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion AcceleratorLanzhou 730000 Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 Institute of High Energy Physics Chinese Academy of SciencesBeijing 100039

Dilepton production during the chemical equilibration of quark-gluon matter with a finite baryon density has been studied. We find that due to the slowing down of the cooling rate and the high initial temperature of the quark-gluon matter produced at RHIC energies, the quark phase contribution to dileptons with intermediate masses is significantly heightened and is much larger than that calculated by the evolution of the thermodynamic equilibrium system. The latter has shown an enhancement of intermediate mass dileptons from the quark phase. Therefore, such an enhancement of dileptons should be a signature for quark-gluon matter formation.

关键词： formation. quark phase.

Dilepton Distribution as a Signature for the Baryon-Rich Quark-Gluon Matter

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Chinese Physics Letters 1997年第8期14卷 577-580页

作者： HE Ze-jun zhang jia-ju WANG Zi-xing QIU Xi-jun CCAST(World Laboratory)P.O.Box 8730 Beijing 100080 Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 Computing Center Shanghai BranchChinese Academy of SciencesShanghai 200031

From the full stopping scenario,the dilepton production in the baryon-rich quark-gluon fireball based on a relativistic hydrodynamic model is studied,and it is found that with increasing incident energy a characterist... 详细信息

关键词： quark lepton relativistic

Dilepton Production in an Expanding Hot Baryon-Rich Quark-Gluon Matter

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Chinese Physics Letters 1999年第12期16卷 879-881页

作者： jiaNG Wei-zhou HE Ze-jun ZHU Zhi-yuan zhang jia-ju Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion AcceleratorLanzhou 730000 Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800

Under thermodynamic equilibrium, the initial values of the quark-gluon system from relativistic nucleus-nucleus collisions are obtained. From these initial values we have studied the dilepton production on the basis of the relativistic hydrodynamic model, and found that with increasing incident energy a characteristic plateau indicating the formation of the quark-gluon plasma appears in the total yield.

关键词： relativistic quark lepton

Intermediate Mass Dilepton Production in an Expanding Baryon-rich Quark--Gluon Matter

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Chinese Physics Letters 2001年第2期18卷 199-201页

作者： HE Ze-jun jiaNG Wei-Zhou ZHOU Wen-Jie zhang jia-ju Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion AcceleratorLanzhou 730000 Shanghai Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800

The intermediate mass dileptons from the quark phase,secondary hadronic processes and background sources have been studied based on a relativistic hydrodynamic *** to the effect of the phase boundary on the evolution of the system the contribution from the quark phase is much more important than that from secondary processes and is even comparable with that from background *** leads to a spectrum without the obvious humps of the hadronic phase contribution and the yield increasing with the incident energy of colliding *** is shown that the enhancement of dileptons is a signature for the formation of the quark--gluon plasma.

关键词： quark signature relativistic

Dilepton Production in an Expanding Hot Baryon-Rich Quark-Gluon Matter

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Chinese Physics Letters 1999年第4期16卷 259-261页

作者： He Ze-jun zhang jia-ju jiaNG Wei-Zhou QIU Xi-jun LIU Bo Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion AcceleratorLanzhou 730000 Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 Institute of High Energy Chinese Academy of SciencesBeijing 100039

From the full stopping scenario,a relativistic hydrodynamic model describing the evolution of the baryon-rich quark-gluon matter fire-cylinder has been *** on it,the rapidity Distribution of dileptons with intermediate invariant masses has been *** is found that the quark phase gives the dominant contribution to the dilepton spectrum due to the influence of the phase boundary on the evolution of the system,especially the dilepton yield is strongly suppressed with the increasing rapidity.

关键词： quark lepton invariant

An Embedded Consensus ADMM Distribution Algorithm Based on Outer Approximation for Improved Robust State Estimation of Networked

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Journal of Modern Power Systems and Clean Energy 2024年第4期12卷 1217-1226页

作者： Zifeng zhang Yuntao ju State Grid Information&Telecommunication Group Co. Ltd.Beijing BranchBejingChina School of Electrical and Control Engineering North China University of TechnologyBeijingChina

Networked microgrids(NMGs)are critical in theaccommodation of distributed renewable ***,theexisting centralized state estimation(SE)cannot meet the demandsof NMGs in distributed energy *** currentestimator is also not robust against bad *** study introducesthe concepts of relative error to construct an improvedrobust SE(IRSE)optimization model with mixed-integer nonlinearprogramming(MINLP)that overcomes the disadvantage ofinaccurate results derived from different measurements whenthe same tolerance range is considered in the robust SE(RSE).To improve the computation efficiency of the IRSE optimizationmodel,the number of binary variables is reduced based on theprojection statistics and normalized residual methods,which effectivelyavoid the problem of slow convergence or divergenceof the algorithm caused by too many integer ***,an embedded consensus alternating direction of multiplier method(ADMM)distribution algorithm based on outer approximation(OA)is proposed to solve the IRSE optimization *** algorithm can accurately detect bad data and obtain SE resultsthat communicate only the boundary coupling informationwith *** tests show that the proposed algorithmeffectively detects bad data,obtains more accurate SE results,and ensures the protection of private information in all microgrids.

关键词： Distributed optimization alternating direction of multiplier methods(ADMM) robust state estimation(RSE) mixed-integer nonlinear programming(MINLP) networked microgrid(NMG)

Distributed dynamic task allocation for unmanned aerial vehicle swarm systems:A networked evolutionary game-theoretic approach

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Chinese Journal of Aeronautics 2024年第6期37卷 182-204页

作者： Zhe zhang ju jiaNG Haiyan XU Wen-An zhang College of Automation Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China College of Economics and Management Nanjing University of Aeronautics and AstronauticsNanjing 211106China College of Information Engineering Zhejiang University of TechnologyHangzhou 310023China

Task allocation is a key aspect of Unmanned Aerial Vehicle(UAV)swarm collaborative *** an continuous increase of UAVs’scale and the complexity and uncertainty of tasks,existing methods have poor performance in computing efficiency,robustness,and realtime allocation,and there is a lack of theoretical analysis on the convergence and optimality of the *** paper presents a novel intelligent framework for distributed decision-making based on the evolutionary game theory to address task allocation for a UAV swarm system in uncertain scenarios.A task allocation model is designed with the local utility of an individual and the global utility of the ***,the paper analytically derives a potential function in the networked evolutionary potential game and proves that the optimal solution of the task allocation problem is a pure strategy Nash equilibrium of a finite strategy ***,a PayOff-based Time-Variant Log-linear Learning Algorithm(POTVLLA)is proposed,which includes a novel learning strategy based on payoffs for an individual and a time-dependent Boltzmann *** former aims to reduce the system’s computational burden and enhance the individual’s effectiveness,while the latter can ensure that the POTVLLA converges to the optimal Nash equilibrium with a probability of *** simulation results show that the approach is optimal,robust,scalable,and fast adaptable to environmental changes,even in some realistic situations where some UAVs or tasks are likely to be lost and increased,further validating the effectiveness and superiority of the proposed framework and algorithm.

关键词： Task allocation Unmanned Aerial Vehicles(UAV) Game theory Log-linear learning Distributed optimization algorithm

Road map for, and technical challenges of, carbon-nanotube integrated circuit technology

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National Science Review 2024年第3期11卷 14-16页

作者： jia Si Panpan zhang Zhiyong zhang Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics School of Electronics Peking University State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

The past decade has witnessed an explosion of research on carbon-nanotube(CNT) electronics due to their outstanding properties, including an ultrathin body, a high carrier mobility and a high saturation velocity.

关键词： TRANSISTORS