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A phenomenological equation of state for isospin asymmetric nuclear matter

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Science China(physics,Mechanics & Astronomy) 2009年第10期52卷 1494-1505页

作者： chen LieWen1,2 1 department of physics,shanghai Jiao Tong university,shanghai 2.02.0,China 2 Center of Theoretical Nuclear physics,National Laboratory of Heavy Ion Accelerator,Lanzhou 730000,China department of physics Shanghai Jiao Tong University Shanghai 200240 China Center of Theoretical Nuclear physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China

A phenomenological momentum-independent(MID) model is constructed to describe the equation of state(EOS) for isospin asymmetric nuclear matter,especially the density dependence of the nuclear symmetry energy Esym(ρ).This model can reasonably describe the general properties of the EOS for symmetric nuclear matter and the symmetry energy predicted by both the sophisticated isospin and momentum dependent MDI model and the Skyrme-Hartree-Fock *** find that there exists a nicely linear correlation between Ksym and L as well as between J0/K0 and K0,where L and Ksym represent,respectively,the slope and curvature parameters of the symmetry energy at the normal nuclear density ρ0,while K0 and J0 are,respectively,the incompressibility and the third-order derivative parameter of symmetric nuclear matter at ρ*** correlations together with the empirical constraints on K0,L and Esym(ρ0) lead to an estimation of -477 MeV Ksat,2 -241 MeV for the second-order isospin asymmetry expansion coefficient for the incompressibility of asymmetric nuclear matter at the saturation point.

关键词： equation of state of nuclear matter isospin the symmetry energy

Higher order bulk characteristic parameters of asymmetric nuclear matter

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Science China(physics,Mechanics & Astronomy) 2011年第S1期54卷 124-129页

作者： chen LieWen1,2 1department of physics, shanghai Jiao Tong university, shanghai 2.02.0, China 2Center of Theoretical Nuclear physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China 1. department of physics Shanghai Jiao Tong University Shanghai 200240 China 2. Center of Theoretical Nuclear physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China

The bulk parameters characterizing the energy of symmetric nuclear matter and the symmetry energy defined at normal nuclear density ρ0 provide important information on the equation of state (EOS) of isospin asymmetric nuclear matter. While significant progress has been made in determining some lower order bulk characteristic parameters, such as the energy E0(ρ0) and incompress ibility K0 of symmetric nuclear matter as well as the symmetry energy Esym(ρ0) and its slope parameter L, yet the higher order bulk characteristic parameters are still poorly known. Here, we analyze the correlations between the lower and higher order bulk char acteristic parameters within the framework of Skyrme Hartree-Fock energy density functional and then estimate the values of some higher order bulk characteristic parameters. In particular, we obtain J0 = (-355±95) MeV and I0 = (1473±680) MeV for the third order and fourth-order derivative parameters of symmetric nuclear matter at ρ0 and Ksym = (-100 ± 165) MeV, Jsym = (224 ± 385) MeV, Isym = (-1309 ± 2025) MeV for the curvature parameter, third-order and fourth-order derivative parameters of the symmetry energy at ρ0, using the empirical constraints on E0(ρ0), K0, Esym(ρ0), L, and the isoscalar and isovector nucleon effective masses. Furthermore, our results indicate that the three parameters E0(ρ0), K0, and J0 can reasonably characterize the EOS of symmetric nuclear matter up to 2ρ0 while the symmetry energy up to 2ρ0 can be well described by Esym(ρ0), L, and Ksym.

关键词： equations of state of nuclear matter forces in hadronic systems and effective interactions symmetry energy nuclear density functional theory and extensions asymmetric matter neutron matter

Codimension 3 nonresonant bifurcations of homoclinic orbits with two inclination flips

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Science China Mathematics 2005年第2期48卷 248-260页

作者： SHUI Shuliang & zhu Deming College of Mathematics and physics, Zhejiang normal university, Jinhua 3.1.04, China department of Mathematics, East China normal university, shanghai 200062, China 1. College of Mathematics and physics Zhejiang Normal University 321004 Jinhua China 2. department of Mathematics East China Normal University 200062 Shanghai China

Homoclinic bifurcations in four-dimensional vector fields are investigated by setting up a local coordinate near a homoclinic orbit. This homoclinic orbit is principal but its stable and unstable foliations take inclination flip. The existence, nonexistence, and uniqueness of the 1-homoclinic orbit and 1-periodic orbit are studied. The existence of the two-fold 1-periodic orbit and three-fold 1 -periodic orbit are also obtained. It is indicated that the number of periodic orbits bifurcated from this kind of homoclinic orbits depends heavily on the strength of the inclination flip.

关键词： bifurcation, homoclinic orbit, non-resonance, inclination flip, 1-periodic orbit.

Rapid Fabrication of Electrodes for Symmetrical Solid Oxide Cells by Extreme Heat Treatment

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Energy & Environmental Materials 2024年第05期7卷 353-360页

作者： Weiwei Fan zhu Sun Manxi Wang Manxian Li Yuming chen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University department of Nuclear Science and Engineering Massachusetts Institute of Technology Cambridge School of Materials Science and Engineering Shanghai Jiao Tong University Zhangjiang Institute for Advanced Study (ZIAS) Shanghai Jiao Tong University College of Environmental Science and Engineering and College of physics and Energy Fujian Normal University

Symmetrical solid oxide cells （SSOCs） are very useful for energy generation and conversion. To fabricate the electrode of SSOC, it is very time-consuming to use the conventional approach. In this work, we design and develop a novel method, extreme heat treatment （EHT）, to rapidly fabricate electrodes for SSOC. We show that by using the EHT method, the electrode can be fabricated in seconds （the fastest method to date）, benefiting from enhanced reaction kinetics. The EHT-fabricated electrode presents a porous structure and good adhesion with the electrolyte. In contrast, tens of hours are needed to prepare the electrode by the conventional approach, and the prepared electrode exhibits a dense structure with a larger particle size due to the lengthy treatment. The EHT-fabricated electrode shows desirable electrochemical performance. Moreover, we show that the electrocatalytic activity of the perovskite electrode can be tuned by the vigorous approach of fast exsolution,deriving from the increased active sites for enhancing the electrochemical reactions. At 900℃, a promising peak power density of 966mWcm-2is reached. Our work exploits a new territory to fabricate and develop advanced electrodes for SSOCs in a rapid and high-throughput manner.

关键词： electrochemical performance extreme heat treatment perovskite electrode symmetrical solid oxide cells

Cavity-enhanced metrology in an atomic spin-1 Bose−Einstein condensate

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Frontiers of physics 2024年第3期19卷 185-196页

作者： Renfei zheng Jieli Qin Bing chen Xingdong Zhao Lu Zhou School of physics Hefei University of TechnologyHefei 230009China State Key Laboratory of Precision Spectroscopy Department of PhysicsSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China School of physics and Materials Science Guangzhou University230 Wai Huan Xi RoadGuangzhou Higher Education Mega CenterGuangzhou 510006China department of physics Henan Normal UniversityXinxiang 453007China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Atom interferometer has been proven to be a powerful tool for precision metrology. Here we propose a cavity-aided nonlinear atom interferometer, based on the quasi-periodic spin mixing dynamics of an atomic spin-1 Bose−Einstein condensate trapped in an optical cavity. We unravel that the phase sensitivity can be greatly enhanced with the cavity-mediated nonlinear interaction. The influence of encoding phase, splitting time and recombining time on phase sensitivity are carefully studied. In addition, we demonstrate a dynamical phase transition in the system. Around the criticality, a small cavity light field variation can arouse a strong response of the atomic condensate, which can serve as a new resource for enhanced sensing. This work provides a robust protocol for cavity-enhanced metrology.

关键词： nonlinear atom interferometer spin-1 Bose−Einstein condensate spin-mixing dynamics quantum Fisher information parameter estimation

Discovery and characterization of naturally occurring covalent inhibitors of SARS-CoV-2 M^(pro)from the antiviral herb Ephedra

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Chinese Journal of Natural Medicines 2024年第9期22卷 797-807页

作者： HU Qing ZHANG Yiwen chen Pengcheng ZHANG Yani zhu Guanghao LIU Wei WANG Chaoran zheng Shuilian SHEN Nonger WANG Haonan HUANG Ping GE Guangbo Center for Clinical Pharmacy Cancer CenterDepartment of PharmacyZhejiang Provincial People’s Hospital(Affiliated People’s Hospital)Hangzhou Medical CollegeHangzhou 310014China shanghai Frontiers Science Center of TCM Chemical Biology Institute of Interdisciplinary Integrative Medicine ResearchShanghai University of Traditional Chinese MedicineShanghai 201203China Shuguang Hospital Affiliated to shanghai university of Traditional Chinese Medicine Shanghai 200021China Dalian Institute of Chemical physics Chinese Academy of SciencesDalian 116023China

The Chinese herb Ephedra(also known as Mahuang)has been extensively utilized for the prevention and treatment of coronavirus-induced diseases,including coronavirus disease 2019(COVID-19).However,the specific anti-SARS-CoV-2 compounds and mechanisms have not been fully *** main protease(M^(pro))of SARS-CoV-2 is a highly conserved enzyme responsible for proteolytic processing during the viral life cycle,making it a critical target for the development of antiviral *** study aimed to identify naturally occurring covalent inhibitors of SARS-CoV-2 M^(pro)from Ephedra and to investigate their covalent binding *** results demonstrated that the non-alkaloid fraction of Ephedra(ENA)exhibited a potent inhibitory effect against the SARS-CoV-2 M^(pro)effect,whereas the alkaloid fraction did ***,the chemical constituents in ENA were identified,and the major constituents'anti-SARS-CoV-2 M^(pro)effects were *** the tested constituents,herbacetin(HE)and gallic acid(GA)were found to inhibit SARS-CoV-2 M^(pro)in a time-and dose-dependent *** combination displayed a significant synergistic effect on this key ***,various techniques,including inhibition kinetic assays,chemoproteomic methods,and molecular dynamics simulations,were employed to further elucidate the synergistic anti-M^(pro)mechanisms of the combination of HE and ***,this study deciphers the naturally occurring covalent inhibitors of SARS-CoV-2 M^(pro)from Ephedra and characterizes their synergistic anti-M^(pro)synergistic effect,providing robust evidence to support the anti-coronavirus efficacy of Ephedra.

关键词： Main protease Ephedra Ephedra non-alkaloid fraction Covalent inhibitors Synergistic effect

Robust asymmetric Cherenkov radiation in tilted anisotropic medium

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Science China(physics,Mechanics & Astronomy) 2024年第1期67卷 46-51页

作者： Shuwen Xue Yadong Xu Linkang Han Zhi Ning chen Qiaoliang Bao Shan zhu Huanyang chen Institute of Electromagnetics and Acoustics and department of physics College of Physical Science and TechnologyJiujiang Research InstituteXiamen UniversityXiamen 361005China School of Physical Science and Technology Institute of Theoretical and Applied PhysicsSoochow UniversitySuzhou 215006China department of Electrical and Computer Engineering National University of SingaporeSingapore 8117583Singapore Institute of Energy Materials Science(IEMS) University of Shanghai for Science and TechnologyShanghai 200093China

Cherenkov radiation(CR)is available for a wide variety of terahertz(THz)radiation sources,but its efficiency is deeply affected by intrinsic *** find that if the tilted angle(α)of anisotropic material and radiation angle(θ)meet the condition ofθ+α=π/2,the intensity of radiation fields for the charged particle bunch(CPB)moving from left to right cannot be influenced by intrinsic losses,which means long-distance radiation can be ***,we observe an asymmetric CR when the CPB moves from the opposite *** addition,we select natural van der Waals(vd W)materialα-MoO3as an example,further confirming that the radiation field can reach the far field and the asymmetric CR radiation can also be *** wonderful properties with long-distance radiation will extend the application of CR to a certain extent for future design and fabrication.

关键词： asymmetric Cherenkov radiation intrinsic losses long-distance radiation

Anticoagulation property and security of artificial heart valve material

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Science China(Technological Sciences) 2005年第2期48卷 145-162页

作者： WANG Xianghui1, , LIU Xianghuai1,22, 3, ZHANG Feng2, LI Changrong2, YU Liujiang2, zheng Zhihong2, WANG Xi2, JIANG Zhenbin4, chen Anqing4 & XU Jingfang3.1. department of physics, East China normal university, shanghai 200062, China 2. Ion Beam Lab, shanghai Institute of Mini-system and information, Chinese Academy of Sciences,shanghai 200050, China 3. department of Electronics, School of Information Science and Technology, East China normal Univer- sity, shanghai 200062, China 4. shanghai Cardiovascular Institute, Zhongshan Hospital, shanghai 200032, China 1. department of physics East China Normal University 200062 Shanghai China 2. Ion Beam Lab Shanghai Institute of Mini-system and information Chinese Academy of Sciences 200050 Shanghai China 3. department of Electronics School of Information Science and Technology East China Normal University 200062 Shanghai China 4. shanghai Cardiovascular Institute Zhongshan Hospital 200032 Shanghai China

Heart valve diseases threaten human health. One reliable way to save lives of such patients is to replace the pathologically changed heart valves by artificial ones. Over 2 million patients have received LTI-carbon heart valve’s implantation. However, the thrombosis after the implantation is one of the difficulties that need to be solved. In order to improve the blood compatibility and security of mechanical heart valves, ion beam technology was used to modify the surface properties of the materials. The investigation results have been summarized in this paper.

关键词： artificial heart valve, ion implantation, plasma immersed ion implantation, ion beam enhanced deposition.

N-Soliron-like Solution of Ito Equation

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Communications in Theoretical physics 2004年第11期 641-644页

作者： ZHANG Yi~(1,2,) chen Deng-Yuan~2 ~1department of Mathematics,Zhejiang normal university,Jinhua 3.1.04,China ~2department of Mathematics,shanghai university,shanghai 200436,China department of Mathematics，Zhejiang normal university，Jinhua 3.1.04，China department of Mathematics，shanghai university，shanghai 200436，China department of Mathematics，shanghai university，shanghai 200436，China

By using the extended Hirota’s method,the N-soliton-like solution of the Ito equation is ***-thermore,we also investSgate the soliton-like solution interaction and find singularity.

关键词： soliton-like solution Ito equation Hirota method