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Equal-Time Transport Theory for Scalar Particles with Width

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Chinese Physics Letters 1999年第5期16卷 330-332页

作者： zhuang peng-fei Rolf Fauser Department of Physics Tsinghua UniversityBeijing 100084 Theoretical Physics Group Gesellschaft für Schwerionenforschang GSID-64291 DarmstadtGermany

For a Ф^(4)-theory the equal-time transport theory is derived with a collision term by including 4-point *** aћexpansion a set of coupled equations is presented for the first three energy moments of the Wigner functions and the 4-point *** presence of 4-point *** limit n→0 is *** the collision term leads already in this limit to particles with width.

关键词： limit collision theory

Volume Effect of Bound States in Quark-Gluon Plasma

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Communications in Theoretical Physics 2006年第6X期46卷 1040-1046页

作者： MAIO Hong GAO Chong-Shou zhuang peng-fei Physics Department Tsinghua University Beijing 100084 China School of Physics Peking University Beijing 100871 China Institute of Theoretical Physics Academia Sinica Beijing 100080 China

Bound states, such as qq and q^-q, may exist the volume of the bound states may evoke a reduction in investigate qualitatively the volume effect on the properties states start to be completely melted.

关键词： QGP equationof state diquark bag model volume effect

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Sigma Decay at Finite Temperature and Density

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Chinese Physics Letters 2001年第3期18卷 344-346页

作者： zhuang peng-fei YANG Zhen-Wei Department of Physics Tsinghua UniversityBeijing 100084

Sigma decay and its relation with chiral phase transition are discussed at finite temperature and density in the framework of the Nambu-Jona-Lasinio *** decay rate for the processσ→2πto first order in 1/Nc(inverse number of colors)expansion is calculated as a function of temperature T and baryon density *** particular,only when the chiral phase transition happens around the tricritical point,theσdecay results in a non-thermal enhancement of pions in the final state distributions in relativistic heavy ion collisions.

关键词： decay chiral transition

Dissociation Temperature of Strictly Confined Charmonium States

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Chinese Physics Letters 2012年第3期29卷 59-62页

作者： QU Zhen LIU Yun-peng zhuang peng-fei Department of Physics Tsinghua UniversityBeijing 100084

We study the dissociation of strictly confined charmonium states at finite *** strict confinement constraint to the Cornell potential leads to a 10%higher J/(φ)dissociation temperature and in turn a weaker J/(φ)supp... 详细信息

关键词： temperature dissociation strictly

Meson Effects on the Chiral Condensate at Finite Density

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Communications in Theoretical Physics 2002年第8期38卷 181-184页

作者： HUANG Mei zhuang peng-fei ZHAO Wei-Qin Physics Department Tsinghua University Beijing 100084 China CCAST (World Laboratory) P.O. Box 8730 Beijing 100080 China Physics Department Tsinghua University Beijing 100084 China CCAST (World Laboratory) P.O. Box 8730 Beijing 100080 China Institute of High Energy Physics the Chinese Academy of Sciences Beijing 100039 China

Meson corrections on the chiral condensate up to next-to-leading order in a 1/Nc expansion at finite densityare investigated in the NJL model with explicit chiral symmetry breaking. Compared with mean-field results, the chiralphase transition is still of the first order while the properties near the critical density for chiral phase transition are foundto change significantly.

关键词： meson corrections, chiral condensate

Analytic Solution of Strongly Coupling Schrdinger Equations

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Communications in Theoretical Physics 2004年第4期 502-508页

作者： LIAO Jin-Feng zhuang peng-fei Physics Department,Tsinghua University,Beijing 100084,China Physics Department Tsinghua UniversityBeijing 100084China

A recently developed expansion method for analytically solving the ground states of strongly couplingSchr(?)dinger equations by Friedberg,Lee,and Zhao is extended to excited states and applied to power-law central forcesfor which scaling properties are *** examples for application of the extended method,the Hydrogen atomproblem is resolved and the low-lying states of Yukawa potential are approximately obtained.

关键词： strong coupling Schrdinger equation Yukawa potential

Coupling of RANS and BEM Solvers for Simulation of Propeller Behind the Hull in Full Appended Model

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China Ocean Engineering 2024年第3期38卷 424-438页

作者： Saeed NAJAFI Mehdi POURMOSTAFA LIU peng-fei Iranian National Institute for Oceanography and Atmospheric Science(INIOAS) Tehran 14155-4781Iran Department of Maritime Engineering Amir Kabir University of TechnologyTehran 15875-4413Iran Marine Offshore and Subsea TechnologySchool of EngineeringNewcastle UniversityNewcastle upon TyneNE17RUUK

To design a propeller for ship power plant,the interaction between ship hull and propeller must be taken into *** main concern is to apply the wake effect of ship stern on the propeller *** this paper,a coupled BEM(Boundary Element Method)/RANS(Renolds-Averaged Navier−Stokes)solver is used to simulate propeller behind the hull in the self-propulsion *** motivation of this work is to develop a practical tool to design marine propulsion system without suffering long computational *** unsteady boundary element method which is also known as panel method is chosen to estimate the propeller *** wakes are treated using a time marching wake alignment ***,a RANS code coupled with VoF equation is developed to consider the ship motions and wake field effects in the problem.A coupling algorithm is developed to interchange ship wake field to the potential flow solver and propeller thrust to the RANS *** on the difference between hull resistance and the propeller thrust,a PI controller is developed to compute the propeller RPM in every time *** of the solver is carried out using the towing tank test report of a 50 m oceanography research *** factor and trust deduction coefficient are estimated ***,the wake rollup pattern of the propeller in open water is compared with the propeller in real wake field.

关键词： RANS BEM coupled method ship propeller self-propulsion wake sheet pattern

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Optimization Mechanism of Mechanical Properties of Basalt Fiber-Epoxy Resin Composites by Interfacially Enriched Distribution of Nano-Starch Crystals

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Chinese Journal of Mechanical Engineering 2024年第3期37卷 289-296页

作者： Yanpeng Wei Jiale Zhao Jian zhuang peng Zhang Zhiwu Han College of Biological and Agricultural Engineering Jilin UniversityChangchun 130025China Key Laboratory of Bionics Engineering Ministry of EducationJilin UniversityChangchun 130025China Weichai Lovol Heavy Industry Co. LTDWeifang 261031China

Fibre reinforced polymer composites have become a new generation of structural materials due to their unique advantages such as high specific strength,designability,good dimensional stability and ease of large-area monolithic ***,the problem of interfacial bonding between the resin matrix and the fibres limits the direct use of reinforcing fibres and has become a central difficulty in the development of basalt fibre-epoxy *** paper proposes a solution for enhancing the strength of the fibre-resin interface using maize starch nanocrystals,which are highly yield and ***,in this paper,corn starch nanocrystals(SNC)were prepared by hydrolysis,and were deposited on the surface of basalt fibers by electrostatic *** that,in order to maximize the modification effect of nano-starch crystals on the interface,the basalt fiber-epoxy resin composite samples were prepared by mixing in a pressureless molding *** test results shown that the addition of basalt fibers alone led to a reduction in the strength of the *** of 0.1 wt%SNC on the surface of basalt fibers can make the strength consistent with pure epoxy *** the adsorption amount of SNC reached 0.5 wt%,the tensile strength of the samples was 23.7%higher than that of pure epoxy *** is due to the formation of ether bond homopolymers between the SNC at the fibre-epoxy interface and the epoxy resin,which distorts the originally smooth interface,leading to increased stress concentration and the development of *** enhances the binding of basalt *** conclusions of this paper can provide an effective,simple,low-cost and non-polluting method of interfacial enhancement modification.

关键词： Basalt fibres Epoxy resin Fibre reinforced composites Starch nanocrystals Eco-friendly

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On the Factors Influencing the High Stretch-Flangeability of a Low-Density 1180 MPa Fe-Mn-Al-C-Nbδ-QP Steel

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1291-1300页

作者： Dan‑Dan Cui peng Chen peng‑fei Wang Xiao‑Wu Li Department of Materials Physics and Chemistry School of Materials Science and Engineeringand Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

Low-densityδ-quenching and partitioning(δ-QP)steels with excellent strength and ductility have been recently ***,there are still rare reports on the formability of δ-QP steels,which are critical for satisfying the manufacture of structural parts during the application in automotive *** the present work,an 1180 MPa Fe–Mn–Al–C–Nbδ-QP steel with a high ductility was adopted for the stretch–flangeability ***δ-QP steel was developed by separated quenching and partitioning processes.A good hole expansion ratio(HER)of 34.9±0.9%was obtained in the quenched steel,but it has been further increased to 52.2%by the tempering *** improved stretch–flangeability was attributed to the enhanced austenite stability and deformation *** the one hand,the stability of austenite was increased by carbon partitioning during tempering,which reduced crack possibility via the suppression of the fresh martensite *** the other hand,the tempering treatment released the internal stress caused by martensitic transformation and reduced the difference in strength among different phases,resulting in an increase in the resistance to crack initiation and propagation.

关键词： Hole expansion ratio Low-densityδ-quenching and partitioning(δ-QP)steel Stretch-flangeability Austenite stability Deformation uniformity