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Studies on the Mechanism of Methyl Methacrylate Polymerization Initiated　by　Volatile　and　Nonvolatile　Products　of　Methyl　Methacrylate　Plasma

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Chemical Research in Chinese Universities 1995年第3期11卷 250-255页

作者： Liu, Xiao-dong Li, Jing ma, yu-gang Shen, Jia-cong NORmaN BETHUNE UNIV MED SCI BASIC MED COLLCHANGCHUN 130023PEOPLES R CHINA JILIN UNIV KEY LAB MOLEC SPECTRA & STRUCTCHANGCHUN 130023PEOPLES R CHINA

he volatile (VPP) and nonvolatile (NVPP) products of methyl methacrylate(Mma) reaction in plasma chamber were used as initiators of Mma polymeriza-tion. From the structure analyses of the two initiators, the measurement of poly-merization kinetics, and the determination of the molecular weight of resultantpolymers , we found tliat Mma polymerization initiated by NVPP is a typical radical mechanism of polymerization which undergoes a process of continuous initiationand bifunction termination , while VPP-initiated polymerization suggested a mech-anism of living radical process fpolymerization with instantaneous initiation , chain-transfer to monomer , without termination).

关键词： Plasma initiated polymerzation Methyl methacrylate Kinetics

Re-examination of Finite-Size Effects in Isobaric Yield Ratios Using a Statistical Abrasion-Ablation Model

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Chinese Physics Letters 2013年第5期30卷 44-47页

作者： ma Chun-Wang WANG Shan-Shan WEI Hui-Ling ma yu-gang Department of Physics Henan Normal UniversityXinxiang 453007 Department of Nuclear Physics Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800

The"finite-size"effects in the isobaric yield ratio(IYR),which are shown in the standard grand-canonical and canonical statistical ensembles(SGC/CSE)method,are claimed to prevent the actual values of physical parameters from being *** conclusion of SGC/CSE may be questionable for neutron-rich nucleus-induced *** investigate whether the IYR has finite-size effects,we re-examine the IYR for the mirror nuclei[IYR(m)]using a modified statistical abrasion-ablation(SAA)*** is found that when the projectile is not so neutron-rich,the IYR(m)depends on the isospin of the projectile,but size dependence can not be *** reactions induced by the very neutron-rich projectiles,contrary results to those of the SGC/CSE models are obtained,i.e.,the dependence of the IYR(m)on the size and the isospin of the projectile is weakened and disappears in both the SAA and experimental results.

关键词： canonical finite mirror

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反物质研究进展

物理学报 2024年第19期73卷 1-24页

作者：马余刚复旦大学现代物理研究所核物理与离子束应用教育部重点实验室上海200433 国家自然科学基金委理论物理专款-上海核物理理论研究中心上海200438

宇宙正反物质的不对称性起源是当今科学的重要未解之谜.本文简要评述反物质研究历程和近期国际上的相关研究热点.重点阐述了近些年来,在相对论重离子碰撞实验中取得的反物质研究进展,包括发现首个反物质超核(反超氚)、反物质氦4、反超氢... 详细信息

宇宙正反物质的不对称性起源是当今科学的重要未解之谜.本文简要评述反物质研究历程和近期国际上的相关研究热点.重点阐述了近些年来,在相对论重离子碰撞实验中取得的反物质研究进展,包括发现首个反物质超核(反超氚)、反物质氦4、反超氢4、反质子相互作用的首次测量、正反超氚核的质量和结合能的精确测量等.在此基础上,我们讨论了(反)轻核产生的不同物理机制.同时,也介绍了反氢原子实验、太空探测反物质等方面取得的最新成果,并讨论这些进展对认识物质结构的启示.

关键词：反物质原子核 CPT对称性 (反物质)轻核产生机制反氢原子

I_κB kinase-beta inhibitor attenuates hepatic fibrosis in mice

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World Journal of Gastroenterology 2011年第47期17卷 5203-5213页

作者： Jue Wei Min Shi Wei-Qi Wu Hui Xu Ting Wang Na Wang Jia-Li ma yu-gang Wang Department of Gastro-enterology Shanghai Changning Central Hospital Shanghai200336 China

AIM: To investigate the anti-fibrosis effect of IκB kinase-beta inhibitor (IKK2 inhibitor IMD0354) in liver fibrosis. METHODS: Twenty male C57BL6 mice were divided into four groups. Five high-fat fed mice were injected with lipopolysaccharide (LPS, 10 mg/kg) intraperitoneally and five high-fat fed mice were without LPS injection to build models of liver injury, and the intervention group (five mice) was injected intraperitoneally with IKK2 inhibitor (IMD 30 mg/kg for 14 d), while the remaining five mice received a normal diet as controls. Hepatic function, pathological evaluation and liver interleukin-6 (IL-6) expression were examined. Western blotting and real-time polymerase chain reaction were used to detect the expressions of nuclear factor-κB (NF-κB), alpha-smooth muscle actin (α-Sma), tumor growth factor-beta1 (TGF-β1), tumor necrosis factor-alpha (TNF-α), typeⅠand type Ⅲ collagen proteins and mRNA. RESULTS: A mouse model of liver injury was successfully established, and IMD decreased nuclear transloca-tion of NF-κB p65 in liver cells. In the IMD-treated group, the levels of alanine aminotransferase (103 ± 9.77 μ/L vs 62.4 ± 7.90 μ/L, P ma (6.19 ± 0.0036 μ/L vs 2.16 ± 0.0023 μ/L, P markedly improved non-alcoholic fatty liver disease in mice by lowering NF-κB activation, which could be

关键词： Liver fibrosis IKK2 inhibitor Nuclear factor-kappa B Tumor growth factor-beta1 Interleukin-6 Alpha-smooth muscle actin C57BL mouse

Effects of Neutron Skin Thickness in Peripheral Nuclear Reactions

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Chinese Physics Letters 2011年第10期28卷 66-69页

作者： FANG De-Qing ma yu-gang CAI Xiang-Zhou TIAN Wen-Dong WANG Hong-Wei Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800

Effects of neutron skin thickness in peripheral nuclear collisions are investigated using the statistical abrasion ablation (SAA) model. The reaction cross section, neutron (proton) removal cross section, one-neutron (proton) removal cross section as well as their ratios for nuclei with different neutron skin thickness are studied. It is demonstrated that there are good linear correlations between these observables and the neutron skin thickness for neutron-rich nuclei. The ratio between the (one-)neutron and proton removal cross section is found to be the most sensitive observable of neutron skin thickness. Analysis shows that the relative increase of this ratio could be used to determine the neutron skin size in neutron-rich nuclei.

关键词： observable section Skin

The influence of Multi-Step Sequential Decay on Isoscaling and Fragment Isospin Distribution in GEMINI Simulation

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Chinese Physics Letters 2011年第6期28卷 82-85页

作者： ZHOU Pei TIAN Wen-Dong ma yu-gang CAI Xiang-Zhou FANG De-Qing WANG Hong-Wei Shanghai Institute of Applied Physics Chinese Academy of SciencesPO Box 800-204Shanghai 201800 Graduate School of the Chinese Academy of Sciences Beijing 100049

Extensive calculations on isoscaling behavior with the sequential-decay model GEMINI are performed for the mediate-heavy nuclei in the mass range A=110 and at excitation energies of up to 3 MeV per *** can still be observed after entire−step decays are considered for the light products as in the only first-step decay process *** between the products after the first-step decay and the ones after entire-step decay demonstrates that multi-step secondary sequential decay strongly influences the isoscaling parametersα,βas well as the fragment isospin *** entire−step decays,the isoscaling parametersαandβare decreased and the fragment isospin distribution can better reproduce the isospin distribution shape as the experimental data.

关键词： scaling decay excitation

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.

关键词： vector meson spin alignment global polarization relativistic heavy ion collisions fragmentation

Directed and Elliptic Flows in ^(112)Sn+^(112)Sn Collisions

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Chinese Physics Letters 2001年第6期18卷 756-758页

作者： ZHANG Hu-Yong ma yu-gang yu Li-Ping SHEN Wen-Qing CAI Xiang-Zhou FANG De-Qing ZHONG Chen HAN Ding-Ding Shanghai Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 Department of Physics Ningbo UniversityNingbo 315211 Department of Electronic Engineering East China Normal UniversityShanghai 200062

The directed and elliptic flow in collisions of ^(112)Sn+^(112)Sn at energies from 35 to 90 MeV/nucleon are studied in an isospin-dependent quantum molecule dynamics *** increasing incident energy,the directed flow rises from negative to *** magnitude depends on the nuclear equation of state(EOS).However,the elliptic flow decreases with increasing incident energy and its magnitude is not very sensible to *** studies of the impact parameter dependence and the cluster mass dependence are also *** study of directed flow at intermediate energies thus provides a means of extracting the information on the nuclear equation of state.

关键词： state directed flow

Isospin Effects of Critical Behavior in Lattice Gas Model

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Chinese Physics Letters 1999年第4期16卷 256-258页

作者： ma yu-gang SU Qian-min SHEN Wen-qing WANG Jian-song CAI Xiang-zhou FANG De-qing Shanghai Institute of Nuclear Research Chinese Academy of SciencesShanghai 201800 Fudan-T.D.Lee Physics Laboratory Fudan UniversityShanghai 200433 CCAST(World Laboratory) P.O.Box 8730Beijing 100080

Isospin effects of the critical phenomena were studied via Xe isotopes in the frame of the lattice gas *** the critical temperatures for four Xe isotopes are close to 5.5 MeV at the same freeze-out density of about 0.39ρ*** critical values of power law parameter of mass distribution,mean multiplicity of intermediate mass fragments,information entropy and Campi's second moment show minor dependence on the isospin at the critical point.

关键词： point critical entropy