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Isospin eigenstates of the color singlet-singlet-type pentaquark states

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Science China(Physics,Mechanics & Astronomy) 2022年第9期65卷 44-51页

作者： Xiu-Wu wang Zhi-Gang Wang Guo-Liang Yu Qi Xin Department of Physics North China Electric Power UniversityBaoding 071003China School of Nuclear Science and Engineering North China Electric Power UniversityBeijing 102206China

In this study,we constructed color singlet-singlet-type five-quark currents with isospins(I,I_(3))=(1/2,1/2)and(3/2,1/2)unambiguously to explore theDΣ_(c),DΣ^(∗)_(c),¯D∗Σc,andD^(∗)Σ^(∗)_(c)pentaquark states via the quantum chromodynamics sum rules for the first time,where¯D,Σc,···represent the color singlet clusters with the same quantum numbers as the corresponding physical mesons or baryons.The numerical results support assigning P_(c)(4312),P_(c)(4380),P_(c)(4440),and P_(c)(4457)as theDΣ_(c),DΣ^(∗)_(c),¯D∗Σc,andD^(∗)Σ^(∗)_(c)pentaquark states,respectively,with the isospin I=1/2.The correspondingDΣ_(c),DΣ^(∗)_(c),¯D∗Σc,andD^(∗)Σ^(∗)_(c)pentaquark states with the isospin I=3/2 have slightly larger masses.The observations of the high pentaquark candidates in the J=Δinvariant mass spectrum would shed light on the nature of the P_(c)states and contribute in distinguishing the scenarios of the color antitriplet-antitriplet-antitriplet-type and color singlet-singlet-type pentaquark states.

关键词： pentaquark states hadronic molecule QCD sum rules

Seasonal coronaviruses and SARS-CoV-2:effects of preexisting immunity during the COVID-19 pandemic

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2022年第6期23卷 451-460页

作者： gang wang Ze XIANG Wei wang zhi CHEN State Key Laboratory for Diagnosis and Treatment of Infectious Diseases National Clinical Research Center for Infectious DiseasesNational Medical Center for Infectious DiseasesCollaborative Innovation Center for Diagnosisand Treatmentof Infectious DiseasesThe First Affiliated HospitalZhejiang University School of Medicine Hangzhou 310003China Zhejiang University School of Medicine Hangzhou 310003China Jiangsu Institute of Parasitic Diseases Wuxi214064China

Although the coronavirus disease 2019(COVID-19)epidemic is still ongoing,vaccination rates are rising slowly and related treatments and drugs are being developed.At the same time,there is increasing evidence of preexisting immunity against severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)in humans,mainly consisting of preexisting antibodies and immune cells(including T cells and B cells).The presence of these antibodies is mainly due to the seasonal prevalence of four common coronavirus types,especially OC43 and HKU1.The accumulated relevant evidence has suggested that the target of antibodies is mainly the S2 subunit of S protein,followed by evolutionary conservative regions such as the nucleocapsid(N)protein.Additionally,preexisting memory T and B cells are also present in the population.Preexisting antibodies can help the body protect against SARS-CoV-2 infection,reduce the severity of COVID-19,and rapidly increase the immune response post-infection.These multiple effects can directly affect disease progression and even the likelihood of death in certain individuals.Besides the positive effects,preexisting immunity may also have negative consequences,such as antibody-dependent enhancement(ADE)and original antigenic sin(OAS),the prevalence of which needs to be further established.In the future,more research should be focused on evaluating the role of preexisting immunity in COVID-19 outcomes,adopting appropriate policies and strategies for fighting the pandemic,and vaccine development that considers preexisting immunity.

关键词： Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2) Coronavirus disease 2019(COVID-19) Preexisting immunity Seasonal coronaviruses Vaccine

Artificially regulated synthesis of nanocrystals in live cells

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National Science Review 2022年第6期9卷 189-199页

作者： An-An Liu En-Ze Sun Zhi-Gang Wang Shu-Lin Liu Dai-Wen Pang State Key Laboratory of Medicinal Chemical Biology Tianjin Key Laboratory of Biosensing and Molecular Recognition Frontiers Science Center for New Organic MatterResearch Center for Analytical SciencesCollege of ChemistrySchool of MedicineFrontiers Science Center for Cell Responses Nankai University College of Chemistry and Molecular Sciences Wuhan University

Live cells, as reservoirs of biochemical reactions, can serve as amazing integrated chemical plants where precursor formation, nucleation and growth of nanocrystals, and functional assembly, can be carried out accurately following an artificial program. It is crucial but challenging to deliberately direct intracellular pathways to synthesize desired nanocrystals that cannot be produced naturally in cells, because the relevant reactions exist in different spatiotemporal dimensions and will never encounter each other spontaneously.This article summarizes the progress in the introduction of inorganic functional nanocrystals into live cells via the ‘artificially regulated space–time-coupled live-cell synthesis’ strategy. We also describe ingenious bio-applications of nanocrystal–cell systems, and quasi-biosynthesis strategies expanded from live-cell synthesis. Artificially regulated live-cell synthesis—which involves the interdisciplinary application of biology, chemistry, nanoscience and medicine—will enable researchers to better exploit the unanticipated potentialities of live cells and open up new directions in synthetic biology.

关键词： cell synthesis nanocrystal quantum dot artificial metabolism

Analysis of the excited Ω_(c) states as the 1/2^(±) pentaquark states with QCD sum rules

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Communications in Theoretical Physics 2021年第3期73卷 78-93页

作者： Hui-Juan wang Zun-Yan Di Zhi-Gang Wang Department of Physics North China Electric Power UniversityBaoding 071003China School of Nuclear Sicence and Engineering North China Electric Power UniversityBeijing 102206China

We construct both the scalar-diquark-scalar-diquark-antiquark type and axialvector-diquark-axialvector-diquark-antiquark type interpolating currents to study the charmed pentaquark:states suscu with J^(p)=1/2^(±).We employ the QCD sum rules to investigate the masses and pole residues of the charmed pentaquark states by taking into account the vacuum condensates up to dimension 13 in the operator product expansion.Our calculation results indicate that the scalar-diquark-scalar-diquark-antiquark type and axialvector-diquark-axialvector-diquark-antiquark type charmed pentaquark states suscu with J^(p)=1/2^(-) can be possible candidates of the excited states observed in the LHCb collaboration.

关键词： charmed baryon states charmed pentaquark states QCD sum rules

Production of high-energy neutron beam from deuteron breakup

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Nuclear Science and Techniques 2022年第7期33卷 125-132页

作者： Ren-Sheng wang Li Ou zhi-gang Xiao School of Radiation Medicine and Protection Medical College of Soochow UniversitySuzhou215123China Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions Suzhou215123China College of Physics and Technology Guangxi Key Laboratory of Nuclear Physics and TechnologyGuangxi Normal UniversityGuilin541004China Department of Physics Tsinghua UniversityBeijing100084China

The deuteron breakup on heavy targets has been investigated in the framework of an improved quantum molecular dynamics model,focusing on the production of neutrons near zero degrees.The experimental differential cross sections of neutron production in the 102 MeV d+C reactions were reproduced by simulations.Based on the consistency between the model prediction and experiment,the feasibility of producing a neutron beam through the breakup of deuteron on a carbon target was demonstrated.Because of the nucleon Fermi motion inside the deuteron,the energy spectrum of the inclusive neutron near 0°in the laboratory exhibits considerable energy broadening in the main peak,whereas the long tail on the low-energy side is suppressed.By coincidentally measuring the accompanying deuteron breakup proton,the energy of the neutron can be tagged with an intrinsic uncertainty of approximately 5%(1σ).The tagging efficiency of the accompanying proton on the forward-emitted neutron can reach 90%,which ensures that the differential cross section in the(d,np)channel remains two orders higher than that in(p,n)after considering the measurement of accompanying protons.This enables the application of a well-defined energy neutron beam in an event-by-event scheme.

关键词： Deuteron breakup Monochromatic neutron High energy Quantum molecular dynamics

INCREASED SPHERULITIC GROWTH RATES OF SEMICRYSTALLINE POLYMER DUE TO ENHANCED LIMITED LOCAL CHAIN SEGMENTAL MOBILITY AT THE INTERFACE OF DOUBLE-LAYER THIN FILMS

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Chinese Journal of Polymer Science 2013年第9期31卷 1276-1283页

作者： Ya-qiong Zhang Zhi-Gang Wang CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China

In this work the nucleation and growth of spherulites for the below polylactide （PLA） layer in poly（ε- caprolactone）/polylactide （PCL/PLA） double-layer films during isothermal crystallization at various temperatures above the melting point of PCL have been investigated by using polarized optical microscopy （POM）. It is revealed that two types of spherulitic morphologies are observed in PCL/PLA double-layer films. One is the well defined highly birefringent spherulites, and the other one is the coarse spherulites. It is interesting to find that the spherulitic growth rate of the coarse spherulites is higher than that of the well defined spherulites. It is thought that the coarse spherulites nucleate and grow with the assistance of the interfaces between the PCL and PLA layers, and the well defined highly birefringent spherulites only nucleate and grow in the PLA layer.

关键词： Polylactide Poly（ε-caprolactone） Interface Crystallization Spherulite.

Strange cousin of Z_(c) (4020/4025) as a tetraquark state

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Chinese Physics C 2022年第12期46卷 135-144页

作者：王志刚 Department of Physics North China Electric Power UniversityBaoding 071003China

Motivated by the analogous properties of Z_(c)(3900/3885)and Z_(cs)(3985/4000).we tentatively assign Z_(c)(4020=4025)as the AA^(-)-type hidden-charm tetraquark state with J^(PC)=1^(+-),where A denotes the axialvector diquark states,and explore AA^(-)-type tetraquark states without strange,with strange,and with hidden-strange via QCD sum rules in a consistent manner.We then explore the hadronic coupling constants in the two-body strong decays of tetraquark states without and with strange via QCD sum rules based on rigorous quark-hadron duality and acquire partial and total decay widths.The present calculations support assigning Z_(c)(4020=4025)as theAA^(-)-type tetraquark state with J^(PC)=1^(+-),while the predictions for its strange cousin Z_(cs)state can be confronted with experimental data in the future.

关键词： tetraquark state QCD sum rules

Endometrial Carcinoma Arising in Didelphic Uterus Accompanied by Right Renal Agenesis： A Case Report

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Chinese Medical Sciences Journal 2016年第3期31卷 200-202页

作者： zhi-qiang wang Zhi-Gang Wang Pan Li Hong-bing Cai Department of Gynecological Oncology Zhongnan Hospital Wuhan University Wuhan 430071 China Department of Cardiothoracic Surgery Nanjing Drum Tower Hospital Medical School of Nanjing University Nanjing 210008 China

MüLLERIAN duct anomalies(MDA)are abnormalities occurring in the müllerian duct due to abnormal development of the uterus,cervix and vagina.Reported prevalence of this malformation in general population was 4%-5%.But real figure may be greater because of unawareness of these diseases due to its asymptomatic nature.~1Bicornuate and didelphic uteri are two common

关键词：子宫内膜癌发育不全发育异常肾 MDA 子宫颈总人口疾病

An accelerated aging assisted by electric current in a Fe-Mn-Al-C low-density steel

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China Foundry 2022年第5期19卷 395-402页

作者： Zhi-Gang Wang Chu-lun Shen Jian-lei Zhang Chang-jiang Song Qi-jie Zhai Center for Advanced Solidification Technology(CAST) School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

An aging method assisted by electric current was applied to a Fe-18Mn-9Al-1C(wt.%)low-density steel.It improves the microstructure and therefore significantly increases both the yield strength and ductility of the steel.This current-assisted aging method can increase the yield strength by 178 MPa and elongation by 1.16 times in only 0.5 min at 450℃.However,the yield strength is increased only 90 MPa by the traditional aging method(heat conduction)at 450℃ for 180 min,and the elongation is even decreased from 42.0%to 31.6%.The obvious improvement in yield strength by the current-assisted aging for a short time is resulted from the fact that the current-assisted aging promotes a rapid precipitation of nano-scaleκ-carbides inγ-austenite by reducing the thermodynamic barrier and accelerating the atomic diffusion.This work demonstrates that this current-assisted aging method is significantly time saving and cost-effective for low-density steels,with potential for various industrial applications.

关键词： low-density steel current-assisted aging κ-carbide