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Multinucleon transfer dynamics in nearly symmetric nuclear reactions

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Nuclear Science and Techniques 2020年第6期31卷 67-74页

作者： Fei Niu peng-hui chen hui-Gan cheng Zhao-Qing Feng School of Physics and Optoelectronic Technology South China University of TechnologyGuangzhou 510641China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100190China

Within the framework of the dinuclear system model,the multinucleon transfer dynamics for nearly symmetric nuclear collisions has been *** reaction mechanism in the systems of 198Pt+198Pt and 204Hg+198Pt was investigated at beam energies around the Coulomb *** was found that the isotopic yields are enhanced with increased incident energy in the domain of proton-rich ***,the production on the neutron-rich side weakly depends on the *** angular distribution with the beam energy was also analyzed in the multinucleon transfer ***-like fragments were produced toward the forward emission with increasing incident *** target-like fragments manifested the opposite trend in the transfer reactions.

关键词： Dinuclear system model Multinucleon transfer reactions Symmetric nuclear collisions Angular distribution

Nuclear dynamics in multinucleon transfer reactions near Coulomb barrier energies

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Nuclear Science and Techniques 2018年第12期29卷 128-133页

作者： peng-hui chen Fei Niu Ya-Fei Guo Zhao-Qing Feng Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 China University of Chinese Academy of Sciences Beijing 100190China South China University of Technology Guangzhou 510641China

The mechanism of multinucleon transfer reactions has been investigated within the dinuclear system model, in which the sequential nucleon transfer is described by solving a set of microscopically derived master equations. The transfer dynamics in the reaction of^(136)Xe+^(208)Pb near Coulomb barrier energies is thoroughly analyzed. It is found that the total kinetic energies of primary fragments are dissipated from the relative motion energy of two touching nuclei and exhibit a symmetric distribution along the fragment mass. The angular distribution of the projectile-like fragments moves forward with increasing beam energy. However, the target-like fragments exhibit an opposite trend. The shell effect is pronounced due to the fragment yields in multinucleon transfer reactions.

关键词：原子动力学转移反应精力库仑相对运动显微镜子转移原子核

Prediction of synthesis cross sections of new moscovium isotopes in fusion‑evaporation reactions

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Nuclear Science and Techniques 2023年第1期34卷 86-101页

作者： peng‑hui chen Hao Wu Zu‑Xing Yang Xiang‑Hua Zeng Zhao‑Qing Feng School of Physical Science and Technology Yangzhou UniversityYangzhou 225009China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China RIKEN Nishina Center WakoSaitama 351‑0198Japan College of Electrical Power and Energy EngineeringYangzhou UniversityYangzhou 225009China School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510641China

In the framework of the dinuclear system model,the synthesis mechanism of the superheavy nuclides with atomic numbers Z=112,114,115 in the reactions of projectiles 40,^(48)Ca bombarding on targets^(238)U,^(242)Pu,and^(243)Am within a wide interval of incident energy has been investigated *** on the available experimental excitation functions,the dependence of calculated synthesis cross-sections on collision orientations has been studied *** total kinetic energy(TKE)of these collisions with fixed collision orientation shows orientation dependence,which can be used to predict the tendency of kinetic energy *** TKE is dependent on incident energies,as discussed in this *** applied the method based on the Coulomb barrier distribution function in our *** allowed us to approximately consider all the collision orientations from tip-tip to *** calculations of excitation functions of^(48)Ca+^(238)U,^(48)Ca+242Pu,and^(48)Ca+^(243)Am are in good agreement with the available experimental *** isospin effect of projectiles on production cross-sections of moscovium isotopes and the influence of the entrance channel effect on the synthesis cross-sections of superheavy nuclei are also discussed in this *** synthesis cross-section of new moscovium isotopes 278−286 Mc was predicted to be as large as hundreds of pb in the fusion-evaporation reactions of^(35,37)Cl+^(248)Cf,^(38,40)Ar+^(247)Bk,^(39,41)K+247 Cm,^(40,42,44,46)Ca+^(243)Am,45 Sc+^(244)Pu,and^(46,48,50)Ti+237Np,51 V+^(238)U at some typical excitation energies.

关键词： Dinuclear system model Superheavy nuclei Complete fusion reactions Production cross-section

Production of neutron-rich actinide isotopes in isobaric collisions via multinucleon transfer reactions

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Nuclear Science and Techniques 2023年第10期34卷 166-177页

作者： peng-hui chen Chang Geng Zu-Xing Yang Xiang-Hua Zeng Zhao-Qing Feng School of Physical Science and Technology Yangzhou UniversityYangzhou 225009China RIKEN Nishina Center WakoSaitama 351‑0198Japan College of Electrical Power and Energy EngineeringYangzhou UniversityYangzhou 225009China School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510641China

We systematically calculated the multinucleon transfer reactions of ^(208)Os,^(208)Pt,^(208)Hg,^(208)Pb,^(208)Po,^(208)Rn,^(208)Ra,and ^(132,136) Xe when bombarded on ^(232) Th and ^(248) Cm at Coulomb barrier energies within the dinuclear system *** results are in good agreement with the available experimental *** influence of Coulomb and shell effects on actinide production in these reactions has been rigorously *** calculated and analyzed the potential energy surface (PES) and total kinetic energy (TKE) mass distributions for the reactions involving ^(208)Hg,^(208)Pb,and ^(208) Po with ^(248) Cm and ^(232)*** PES and TKE spectra shed light on the fragment formation mechanisms in multinucleon transfer reactions,with clear indications of isospin and shell *** production cross sections for multinucleon transfer products show a strong dependence on isobar projectiles with a mass number A=*** projectiles with high N/Z ratios are advantageous for generating neutron-rich target-like ***,products induced by isobar projectiles with larger charge numbers tend to shift toward proton-rich *** intertwining of the Coulomb potential and shell effect is evident in the production cross sections of actinide *** from reactions induced by radioactive projectiles,we anticipate the discovery of several new actinide isotopes near the nuclear drip lines,extending our reach into the superheavy nuclei domain.

关键词： Dinuclear system model Isobaric collisions Multinucleon transfer reactions Neutron-rich actinides

Corticostriatal Neurons in the Anterior Auditory Field Regulate Frequency Discrimination Behavior

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Neuroscience Bulletin 2023年第6期39卷 962-972页

作者： Zhao-Qun Wang hui-Zhong Wen Tian-Tian Luo peng-hui chen Yan-Dong Zhao Guang-Yan Wu Ying Xiong Department of Neurobiology Chongqing Key Laboratory of NeurobiologyArmy Medical UniversityChongqing400038China Experimental Center of Basic Medicine Army Medical UniversityChongqing400038China

The anterior auditory field(AAF)is a core region of the auditory cortex and plays a vital role in discrimination ***,the role of the AAF corticostriatal neurons in frequency discrimination remains ***,we used c-Fos staining,fiber photometry recording,and pharmacogenetic manipulation to investigate the function of the AAF corticostriatal neurons in a frequency discrimination task.c-Fos staining and fiber photometry recording revealed that the activity of AAF pyramidal neurons was significantly elevated during the frequency discrimination *** inhibition of AAF pyramidal neurons significantly impaired frequency *** addition,histological results revealed that AAF pyramidal neurons send strong projections to the ***,pharmacogenetic suppression of the striatal projections from pyramidal neurons in the AAF significantly disrupted the frequency ***,our findings show that AAF pyramidal neurons,particularly the AAF–striatum projections,play a crucial role in frequency discrimination behavior.

关键词： Anterior auditory field Corticostriatal neuron Frequency discrimination AAF-striatum projection

Isospin effect in peripheral heavy-ion collisions at Fermi energies

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Chinese Physics C 2018年第12期42卷 132-139页

作者： Ya-Fei Guo peng-hui chen Fei Niu Zhao-Qing Feng Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100190China School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China

The isospin effect in peripheral heavy-ion collisions was thoroughly investigated within the framework of the Lanzhou quantum molecular dynamics （LQMD） transport model. A coalescence approach was used to recognize the primary fragments formed in nucleus-nucleus collisions. described using the statistical code GEMINI. The production The secondary decay process of these fragments was mechanism and isospin effect of the projectile-like and target-like fragments were analyzed using the combined approach. It was found that the isospin migration from the high-isospin density to the low-density matter occurred in the neutron-rich nuclear reactions, i.e., ^48Ca＋^208Pb, ^86Kr＋^48SCa/^208Pb/^124Sn,^136Xe＋^208Pb, ^124Sn＋^124Sn, and ^136Xe＋^136Xe. A hard symmetry energy was available for creating the neutron-rich fragments, particularly in the medium-mass region. The isospin effect of the neutron-to- proton （n/p） ratio of the complex fragments was reduced when the secondary decay process was included. However, a soft symmetry energy enhanced the n/p ratio of the light particles, particularly at kinetic energies greater than 15 MeV/nucleon.

关键词： symmetry energy nuclear fragmentation reaction neutron-rich nuclei LQMD transport model

A Putative NES Mediates Cytoplasmic Localization of Apoptin in Normal Cells

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Acta Biochimica et Biophysica Sinica 2004年第12期36卷 817-823页

作者： Qing-Ming WANG*, Guo-Cai FAN, Ji-Zhong chen, hui-peng chen, and Fu-Chu HE* Department of Genomics and Proteomics, Beijing Institute of Radiation Medicine, Beijing 100850, China Department of Genomics and Proteomics Beijing Institute of Radiation MedicineBeijing 100850 China

Apoptin, a protein expressed by chicken anemia virus, is found predominantly in the cytoplasm in normal cells, whereas it localizes in the nucleus in transformed and malignant cells. However, the mecha- nisms that regulate the different subcellular localization of Apoptin in normal and tumor cells have not been fully clarified. In this work, a putative nuclear export signal (NES) in Apoptin was predicted. It was testified that the putative NES (pNES) of Apoptin was not a functional NES, but actually acted as a cytoplasmic retention signal. Deletion of the pNES led to the nuclear accumulation of Apoptin in normal cells. In addition, when a strong nuclear localization signal was introduced into Apoptin, it exclusively translocated to the nucleus in normal cells. These observations indicated that the cytoplasmic localization of Apoptin in normal cells results from the balance between cytoplasmic retention and nuclear import. On the other hand, the pNES was also proved to be necessary for Apoptin multimerization. Mutants lacking the pNES did not form obviously visible globular aggregates in normal or tumor cells.

关键词： Apoptin nuclear localization signal cytoplasmic retention signal nuclear export signal

Receptor-binding domain of SARS-Cov spike protein: Soluble expression in ***, purification and functional characterization

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World Journal of Gastroenterology 2005年第39期11卷 6159-6164页

作者： Jing chen Lin Miao Jia-Ming Li Yan-Ying Li Qing-Yu Zhu Chang-Lin Zhou Hong-Qing Fang hui-peng chen Institute of Biotechnology Academy of Military Medical Science Beijing 100071 China The Pharmaceutical University of China Nanjing 210009 Jiangsu Province China Institute of Microbiology and Epidemiology Academy of Military Medical Sciences Beijing 100071 China

AIM： To find a soluble and functional recombinant receptor-binding domain of severe acute respiratory syndrome-associated coronavirus （SARS-Cov）, and to analyze its receptor binding ability. METHODS： Three fusion tags （glutathione S-transferase, GST; thioredoxin, Trx; maltose-binding protein, MBP）, which preferably contributes to increasing solubility and to facilitating the proper folding of heteroprotein, were used to acquire the soluble and functional expression of RBD protein in Escherichia coli （BL21（DE3） and Rosetta-gamiB （DE3） strains）. The receptor binding ability of the purified soluble RBD protein was then detected by ELISA and flow cytometry assay. RESULTS： RBD of SARS-Cov spike protein was expressed as inclusion body when fused as TrxA tag form in both BL21 （DE3） and Rosetta-gamiB （DE3） under many different cultures and induction conditions. And there was no visible expression band on SDS-PAGE when RBD was expressed as MBP tagged form. Only GST tagged RBD was soluble expressed in BL21（DE3）, and the protein was purified by AKTA Prime Chromatography system. The ELISA data showed that *** antigen had positive reaction with anti-RBD mouse monoclonal antibody 1A5. Further flow cytometry assay demonstrated the high efficiency of RBD＇s binding ability to ACE2 （angiotensin-converting enzyme 2） positive Vero E6 cell. And ACE2 was proved as a cellular receptor that meditated an initial-affinity interaction with SARS-Cov spike protein. The geometrical mean of GST and *** binding to Vero E6 cells were 77.08 and 352.73 respectively. CONCLUSION： In this paper, we get sufficient soluble N terminal GST tagged RBD protein expressed in EcoliBL21 （DE3）; data from ELISA and flow cytometry assay demonstrate that the recombinant protein is functional and binding to ACE2 positive Vero E6 cell efficiently. And the recombinant RBD derived from *** can be used to developing subunit vaccine to block S protein binding with receptor and to neutralizing SARS-Cov infection.

关键词： Receptor-binding domain SARS-Cov Spike protein expression E.coli

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提高焦炭质量的研究

钢铁 2005年第6期40卷 14-16,39页

作者：彭陈辉涟源钢铁集团公司技术中心湖南娄底417009

介绍了焦炭质量变化对高炉操作的影响以及大高炉生产对焦炭质量的要求。通过完善煤质管理、改善焦炉炉温均匀性、重视焦炭的热性质、优化配煤结构、改善焦炭强度等途径,提高焦炭质量。提出在炼焦煤资源紧张的情况下,采取选择粉碎、煤干... 详细信息

介绍了焦炭质量变化对高炉操作的影响以及大高炉生产对焦炭质量的要求。通过完善煤质管理、改善焦炉炉温均匀性、重视焦炭的热性质、优化配煤结构、改善焦炭强度等途径,提高焦炭质量。提出在炼焦煤资源紧张的情况下,采取选择粉碎、煤干燥、煤水分控制、煤干燥风选压块、干法熄焦等配煤炼焦新技术,可以提高涟钢焦炭质量,满足大高炉生产需要。

关键词：高炉生产焦炭质量改善