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Vector meson's spin alignments in high energy reactions

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 5-20页

作者： Jin-Hui Chen Zuo-Tang Liang yu-gang Ma Xin-Li Sheng Qun Wang Key Laboratory of Nuclear Physics and Ion-beam Application (MoE) Institute of Modern PhysicsFudan University Institute of Frontier and Interdisciplinary Science Key Laboratory of Particle Physics and Particle Irradiation (MOE)Shandong University INFN-Firenze Department of Modern Physics University of Science and Technology of China School of Mechanics and Physics Anhui University of Science and Technology

The global spin alignment of vector mesons has been observed by the STAR collaboration at the Relativistic Heavy Ion Collider （RHIC） at Brookhaven National Laboratory （BNL）.It provides a unique opportunity to probe the correlation between the polarized quark and antiquark in the strongly coupled quark-gluon plasma （sQGP） produced in relativistic heavy ion collisions,opening a new window to explore the properties of s *** addition,spin alignments of vector mesons have also been observed in other high-energy particle collisions such as e+e-annihilations at high energies where hadron production is dominated by quark fragmentation *** results obtained are quite different from those obtained in heavy ion collisions where quark coalescence/combination mechanism dominates suggesting strong dependence on hadronization *** comprehensive studies in different hadronization processes are *** this article,we present a brief review of theoretical and experimental advances in the study of vector meson’s spin alignments in a variety of high-energy particle collisions,with emphasis on hadronization mechanisms.

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Emerging contaminant control:From science to action

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Frontiers of Environmental Science & Engineering 2022年第6期16卷 171-174页

作者： Bin Wang gang yu Beijing Laboratory of Environmental Frontier Technology Beijing Key Laboratory of Emerging Organic Contaminants ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China Research Institute for Environmental Innovation(Suzhou) TsinghuaSuzhou 215163China

Since the concept of emerging contaminants(ECs)was first proposed in 2001,the global scientific research of ECs has developed *** the past decades,great progress has been achieved in the scientific research of ECs in China,including the establishment of EC analysis method system,the evaluation of the pollution status,pollution characteristics and environmental risk of ECs in typical regions of China,and establishment of EC control technology *** progress in scientific research of ECs promoted China’s action on EC *** is planned that the environmental risk of ECs will be generally controlled by 2035 in *** ECs should be screened for environmental *** great efforts have been made,the EC control in China still faces tremendous *** is necessary to bridge the gap between scientific research and decision-making *** on the science and technology study,various measures such as engineering,policy management and public participation should be combinedly adopted for EC control.

关键词： Emerging contaminants Priority pollutants PPCPs POPs Control policy

Hypernuclei as a laboratory to test hyperon–nucleon interactions

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Nuclear Science and Techniques 2023年第6期34卷 5-8页

作者： yu-gang Ma Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai200438China

Directed flow(v_(1))of the hypernuclei ^(3)_(Λ)H and ^(4)_(Λ)H have been observed in mid-central Au+Au collisions at√^(s)NN=3 GeV at *** measurement opens up a new possibility for studying hyperon–nucleon(Y–N)interaction under finite *** addition,multi-strangeness hypernuclei provide a venue to probe hyperon–nucleon–nucleon(Y–N–N)and even hyperon–hyperon–nucleon(Y–Y–N)*** are important for making connection between nuclear collisions and the equation of state which governs the inner structure of compact stars.

关键词： nucleon addition equation

New type of double‑slit interference experiment at Fermi scale

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Nuclear Science and Techniques 2023年第1期34卷 175-177页

作者： yu‑gang Ma Key Laboratory of Nuclear Physics and Ion‑beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai 200438China

A new approach that using polarized photon–gluon collisions reported by STAR Collaboration is used to do tomography of the ultrarelativistic *** collision can be treated as a double-slit experiment at Fermi scale and... 详细信息

关键词： Fermi double radius

Nuclear Zpif-Type Plots

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Chinese Physics Letters 2000年第5期17卷 340-342页

作者： MA yu-gang Shanghai Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 CCAST(World Laboratory) P.O.Box 8730Beijing 100080

Isospin dependent classical molecular dynamics model is used to investigate the nuclear disassembly of^(129)***-type plot in the field of linguistics is tested for the rank-classified cluster arrangement from this *** is found that the average cluster charge(or mass)of rank n in the charge(or mass)list is exactlyinverse to its rank,*** exists Zpif's law at the point of the liquid gas phase *** novel criterioncan be used to diagnose the nuclear liquid gas phase transition experimentally and theoretically.

关键词： transition cluster rank

Effects ofmodulenumberand firing conditiononchargethermal safetyingunchamber

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Defence Technology（防务技术） 2022年第1期18卷 27-37页

作者： Huan-yu Qian Yong-gang yu Jing Liu School of Energy and Power Engineering Nanjing University of Science and Technology Narjing 21094 China Acudemny of Opto-Electroric China Electronis Technology Group Corporation(AOE CETC)Tianjin300308China

Thermal safety of modular charge which is fed into and retained in the chamber after gun fires consecutively is first investigated with cook-off method,A two-dimensional cook-off model of modular charge in gun chamber is established and the cook-off process of modular charge in gun chamber is numerically *** the effects of module number and firing condition on charge thermal safety are evaluated by researching the cook-off response characteristics of *** results show that under conditions of different module numbers the cook-off responses all occur on the module closest to the boundary of missile,and the single-base propellants located at the inner surface of cartridge ignite *** the number of loaded module changes from 1 to 6,the cook-off response temperatures vary little,only in a small range of 478.1 K-482.4 *** cook-off response times decrease logarithmically in the range of 211.25-166.7 s with the increasing length of residual air gap in gun *** simulation results are well matched with the experimental ***,different firing conditions have greatinfluence on the cook-off response time,minor influence on the initial response position and little in-fluence on the response *** the three conditions of consecutive 32 launches with 5 rounds/min,43 launches with 1 round/min,and 41 launches with different firing frequencies,the cook off response temperatures are 479.2 K,481.1 K and 479.9 K respectively and the response times are 709.25,211.2 s and 214.4 s *** response position is near the middle area of the inner cartridge surface in the former condition and near the right area in the latter two conditions.

关键词： Thermal safety Modular charge Cook-off Firing condition

α-clustering effect on flows of direct photons in heavy-ion collisions

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Nuclear Science and Techniques 2021年第6期32卷 122-132页

作者： Chen-Zhong Shi yu-gang Ma Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China University of the Chinese Academy of Sciences Beijing 100080China

In this study,we reconstruct theγ-photon energy spectrum,which is in good agreement with the experimental data of ^(86)Kr+^(12)C at E/A=44 Me V within the framework of the modified EQMD *** directed and elliptic flows of free protons and direct photons were investigated by considering theα-clustering structure of ^(12)*** with free protons,direct photon flows provide clearer information about the early stage of a nuclear *** difference in the collective flows between different configurations of ^(12)C is observed in this *** indicates that the collective flows of direct photons are sensitive to the initial ***,theγbremsstrahlung process might be taken as an alternative probe to investigate theα-clustering structure in a light nucleus from heavy-ion collisions within the Fermienergy region.

关键词： Nuclear reaction Direct photon Collective flow α-clustering configuration

Incipient Gear Fault Detection Using Adaptive Impulsive Wavelet Filter Based on Spectral Negentropy

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Chinese Journal of Mechanical Engineering 2022年第1期35卷 156-178页

作者： Mang Gao gang yu Changning Li School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518055China School of Electronic and Information Engineering Suzhou University of Science and TechnologySuzhou 215009China

Adaptive wavelet filtering is a very important fault feature extraction method in the domain of condition monitoring;however, owing to the time-consuming computation and difficulty of choosing criteria used to represent incipient faults, the engineering applications are limited to some extent. To detect incipient gear faults at a fast speed, a new criterion is proposed to optimize the parameters of the modified impulsive wavelet for constructing an optimal wavelet filter to detect impulsive gear faults. First, a new criterion based on spectral negentropy is proposed. Then, a novel search strategy is applied to optimize the parameters of the impulsive wavelet based on the new criterion. Finally,envelope spectral analysis is applied to determine the incipient fault characteristic frequency. Both the simulation and experimental validation demonstrated the superiority of the proposed approach.

关键词： Incipient fault diagnosis Negentropy Spectral kurtosis Gear Adaptive wavelet

MARKETING OBJECTIVES OF RETAILERS WITH DIFFERENTIATED GOODS:AN EVOLUTIONARY PERSPECTIVE

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Journal of Systems Science and Systems Engineering 2006年第3期15卷 359-374页

作者： Tiaojun XIAO gang yu School of Management Science and Engineering Nanjing University Nanjing Jiangsu 210093 China Department of Management Science and Information Systems McCombs School of Business The University of Texas at Austin Austin Texas 78712-1175 USA

In the real world, revenue maximization behavior may prevail in various markets. To understand this phenomenon, we develop a two-population model with two-vertically integrated channels. Every channel consists of one manufacturer and many （a sufficiently large number of） retailers that sell products in different markets by adopting pure marketing objective strategies： profit maximization and revenue maximization. We study the marketing objective behaviors in the quantity-setting duopoly and the price-setting duopoly situations respectively from an indirect evolutionary point of view. In the quantity-setting duopoly situation, we find that whether the equilibrium is an evolutionarily stable strategy depends on the type of strategic iateraction （substitutes or complements）, relative unit cost, market scale, etc. We extend it to the case with continuous preferences. We argue that revenue maximization may be an evolutionarily stable strategy and profit maximization strategy may be unstable. Under proper conditions, revenue maximization behavior can coexist with profit maximization behavior. In the price-setting duopoly situation with linear demand functions, we find that profit maximization is always an evolutionarily stable strategy and revenue maximization behavior will gradually become extinct. The extended model has a similar result but the retailers may compromise the two pure strategies.

关键词： Evolutionary game theory ESS marketing objective complements and substitutes