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Isotopic dependence of the yield ratios of light fragments from different projectiles and their unified neutron skin thicknesses

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nuclear Science and Techniques 2024年第3期35卷 228-236页

作者： Ting-Zhi Yan shan Li School of Energy and Power Engineering Northeast Electric Power UniversityJilin 132012China

The yield ratios of neutron-proton(R(n/p))and^(3)H-^(3)He(R(^(3)H∕^(3)He))with reduced rapidity from 0 to 0.5 were simulated at 50 MeV/u even-even ^(36−56)Ca+^(40)Ca,even-even ^(48−78)ni+^(58)ni,and ^(100−139)Sn(every third isotopes)+112 Sn for full reduced impact parameters using the isospin-dependent quantum molecular dynamics(IQMD)*** neutron and proton density distributions and root-mean-square radii of the reaction systems were obtained using the Skyrme-Hartree-Fock model,which was used for the phase space initialization of the projectile and target in *** defined the unified neutron skin thickness asΔRnp=^(1∕2) n−^(1∕2)p,which was negative for neutron-deficient *** unifiedΔRnp values for nuclei with the same relative neutron excess from different isotopic chains were nearly equal,except for extreme neutron-rich isotopes,which is a type of scaling *** yield ratios of the three isotopic chain-induced reactions,which depended on the reduced impact parameter and unified neutron skin thickness,were *** results showed that both R(n/p)and R(^(3)H∕^(3)He)decreased with a reduced impact parameter for extreme neutron-deficient isotopes;however,they increased with reduced impact parameters for extreme neutron-rich isotopes,and increased with theΔRnp of the projectiles for all reduced impact *** addition,a scaling phenomenon was observed betweenΔR np and the yield ratios in peripheral colli-sions from different isotopic chain projectiles(except for extreme neutron-rich isotopes).Thus,R(n/p)and R(^(3)H∕^(3)He)from peripheral collisions were suggested as experimental probes for extracting the neutron or proton skin thicknesses of non-extreme neutron-rich nuclei from different isotopic chains.

关键词： Exotic nuclei Unified neutron skin thickness Yield ratios IQMD

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Greedy Lattice Paths with General Weights

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Acta Mathematica Sinica,English Series 2024年第9期40卷 2213-2222页

作者： Yin shan CHAnG An Qi ZHEnG College of Mathematics Sichuan UniversityChengdu 610065P.R.China

Let{X_(v):v∈Z^(d)}be *** *** S(π)=Σ_(v∈π)X_(v)be the weight of a self-avoiding lattice pathπ.Let M_(n)=max{S(π):πhas length n and starts from the origin}.We are interested in the asymptotics of Mn as n→∞.This model is closely related to the first passage percolation when the weights{X_(v):v∈Z^(d)}are non-positive and it is closely related to the last passage percolation when the weights{X_(v):v∈Z^(d)}are *** general weights,this model could be viewed as an interpolation between first passage models and last passage ***,this model is also closely related to a variant of the position of right-most particles of branching random *** the two assumptions that∃α>0,E(X_(0)^(+))^(d)(log^(+)X_(0)^(+))^(d+α)nd that E[X_(0)^(−)]nite real number M such that Mn/n converges to a deterministic constant M in L^(1)as n tends to *** under the stronger assumptions that∃α>0,E(X_(0)^(+))^(d)(log^(+)X_(0)^(+))^(d+α)nd that E[(X_(0)^(−))^(4)]n)/n converges to the same constant M almost surely as n tends to infinity.

关键词： Last passage percolation first passage percolation greedy lattice path

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The role of m^(6)A RnA methylation in autoimmune diseases: novel therapeutic opportunities

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Genes & Diseases 2024年第1期11卷 252-267页

作者： Yunan shan Wei Chen Yanbin Li The First Clinical Medical College Shandong University of Traditional Chinese MedicineJinanShandong 250013China Department of neurology The First Affiliated Hospital of Shandong First Medical University&Shandong Provincial Qjanfoshan HospitalShandong Institute of NeuroimmunologyShandong Key Laboratory of Rheumatic Disease and Translational MedicineJinanShandong 250013China Department of Gastroenterology Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200233China

n6-methyladenosine m^(6)A modifications,as one of the most common forms of in-ternal RnA chemical modifications in eukaryotic cells,have gained increasing attention in recent *** m^(6)A RnA modifications exert various crucial roles in various biological pro-cesses,such as embryonic development,neurogenesis,circadian rhythms,and *** advances have highlighted that m^(6)A RnA modification plays an important role in im-mune response,especially in the initiation and progression of autoimmune *** this re-view,we summarized the regulatory mechanisms of m^(6)A methylation and its biological functions in the immune system and mainly focused on recent progress in research on the po-tential role of m^(6)A RnA methylation in the pathogenesis of autoimmune diseases,thus providing possible biomarkers and potential targets for the prevention and treatment of auto-immunediseases.

关键词： Adaptive immunity Autoimmune diseases Innate immunity Immune response m^(6)A RnA methylation

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Promoted nH_(3)-SCR activity and hydrothermal stability of Cu-SSZ-50 catalyst synthesized by one-pot method

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Chinese Chemical Letters 2024年第3期35卷 135-139页

作者： Jinpeng Du Jingyi Wang Yulong shan Shichao Han Wenpo shan Hong He Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research StationInstitute of Urban EnvironmentChinese Academy of SciencesNingbo 315800China University of Chinese Academy of Sciences Beijing 100049China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

nitrogen oxide(nO_(x))is one of the most critical contaminants in the air,and the control of nO_(x)emission from diesel vehicles is very ***-based small-pore zeolites have already been applied for nO_(x)abatement on diesel *** the small-pore zeolites,Cu-SSZ-50 catalysts with good nH_(3)-SCR catalytic activity were believed to have potential for *** this study,a one-pot synthesis method for Cu-SSZ-50 catalysts was developed for the first time,using the co-templates of Cu-TEPA and 2,6-dimethyl-n-methylpyridinium *** this synthesis method,Cu-SSZ-50 with various Cu contents can be obtained by adjusting the amount of Cu-TEPA without the need for a further after-treatment *** addition of Cu-TEPA affected the framework atoms and Cu species,and a lower Si/Al ratio and more SCR active Cu species were *** synthesized catalyst with a Cu/Al ratio of 0.40 exhibited over 90%nO_(x)conversion between 200℃and 450℃for the selective catalytic reduction of nO_(x)with nH_(3)(nH_(3)-SCR).Meanwhile,over 80%nO_(x)conversion could be obtained from 250℃to 450℃after hydrothermal aging at 750℃for 16 *** addition,both L-H and E-R mechanisms were proven to exist for the one-pot-synthesized Cu-SSZ-50 by in situ DRIFTS *** simple synthesis procedure,excellent catalytic activity and hydrothermal stability brighten the prospects for the application of Cu-SSZ-50.

关键词： nH_(3)-SCR Cu-SSZ-50 One-pot synthesis Si/Al ratio Cu species distribution Reaction mechanism

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Photocatalytic vinyl radical-mediated multicomponent 1,4-/1,8-carboimination across alkynes and olefins/(hetero)arenes

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Science China Chemistry 2024年第2期67卷 558-567页

作者： shan-shan Li Yu-Shi Jiang Xue-Ling Luo Xuming Ran Yuqiang Li Dong Wu Cheng-Xue Pan Peng-Ju Xia School of Chemistry and Pharmaceutical Sciences Guangxi Normal UniversityGuilin541004China shanghai Artificial Intelligence Laboratory Shanghai200433China The Institute for Advanced Studies Wuhan UniversityWuhan430064China

We developed a highly selective and efficient multicomponent transformation by utilizing alkynes and olefins/(hetero)arenes through photoinduced energy-transfer *** reaction involves the formation of three distinct chemical bonds,namely C(sp~3)–C(sp~2),C(sp~2)–C(sp~3),and C(sp~3)–n,in a single coordinated *** strategy used a vinyl radical-mediated radical relay approach under mild conditions,exhibiting a broad substrate scope(>70 examples),excellent functional-group tolerance,and remarkable regio-and *** the utilization of a combination of experimental techniques and density functional theory(DFT),we delved deeper into the mechanistic intricacies of this distinctive *** revealed that the selective radical addition to electron-deficient alkynes,rather than olefins,was governed by the inherent reactivity of alkyl *** discovery presented a highly effective approach for the synthesis of stereodefined multisubstituted alkenes.

关键词： alkyne-olefin coupling DFT studies regio-and anti-stereoselectivity multisubstituted alkenes

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Decentralized Primary Frequency Regulation for Hybrid Multi-terminal Direct Current Power Systems Considering Multi-source Enhancement

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 958-970页

作者： Jialiang Wu Zhen Wang Ruixu Liu Yu shan Chenxuan Wang the College of Electrical Engineering Zhejiang UniversityHangzhou 310027China the Economic Research Institute of State Grid Zhejiang Electric Power Co. Ltd.Hangzhou 310016China

Hybrid multi-terminal direct current(MTDC)transmission technology has been a research focus,and primary frequency regulation(FR)improvement in the receiving-end system is one of the problems to be *** paper presents a decentralized primary FR scheme for hybrid MTDC power systems considering multi-source enhancement to help suppress frequency disturbance in the receiving-end *** the converters only need local frequency or DC voltage signal input to respond to system disturbance without communication or a control center,i.e.,a decentralized control *** proposed scheme can activate appropriate power sources to assist in FR in various system disturbance severities with fine-designed thresholds,ensuring sufficient utilization of each power *** better balance FR performance and FR resource participation,an evaluation index is proposed and the parameter optimization problem is further ***,the validity of the proposed scheme is verified by simulations in MATLAB/Simulink.

关键词： Decentralized control scheme primary frequency regulation(FR) rate of change of frequency(ROCOF) system frequency disturbance

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Yangyin Huowei mixture alleviates chronic atrophic gastritis by inhibiting the IL-10/JAK1/STAT3 pathway

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World Journal of Gastrointestinal Surgery 2024年第7期16卷 2296-2307页

作者： shan-shan Xie Yong Zhi Chang-Ming Shao Bin-Fang Zeng Department of traditional Chinese Medicine Xinjiang Medical UniversityUrumqi 830017Xinjiang Uygur Autonomous RegionChina

BACKGROUnD The Chinese medicine Yangyin Huowei mixture(YYHWM)exhibits good clinical efficacy in the treatment of chronic atrophic gastritis(CAG),but the mechanisms underlying its activity remain *** To investigate the therapeutic effects of YYHWM and its underlying mechanisms in a CAG rat *** Sprague-Dawley rats were allocated into control,model,vitacoenzyme,and low,medium,and high-dose YYHWM *** was induced in rats using nmethyl-n′-nitro-n-nitrosoguanidine,ranitidine hydrochloride,hunger and satiety perturbation,and ethanol *** an 8-wk intervention period,stomach samples were taken,stained,and examined for histopathological *** was utilized to quantify serum levels of PG-I,PG-II,G-17,IL-1β,IL-6,and TnF-α.Western blot analysis was performed to evaluate protein expression of IL-10,JAK1,and *** The model group showed gastric mucosal layer disruption and inflammatory cell *** with the blank control group,serum levels of PGI,PGII,and G-17 in the model group were significantly reduced(82.41±3.53 vs 38.52±1.71,23.06±0.96 vs 11.06±0.70,and 493.09±12.17 vs 225.52±17.44,Pnd TnF-αwere significantly increased(30.15±3.07 vs 80.98±4.47,69.05±12.72 vs 110.85±6.68,and 209.24±11.62 vs 313.37±36.77,Pnd the protein levels of IL-10,JAK1,and STAT3 were higher in gastric mucosal tissues(0.47±0.10 vs 1.11±0.09,0.49±0.05 vs 0.99±0.07,and 0.24±0.05 vs 1.04±0.14,Pnt significantly improved the gastric mucosal tissue damage,increased the levels of PGI,PGII,and G-17(38.52±1.71 vs 50.41±3.53,11.06±0.70 vs 15.33±1.24,and 225.52±17.44 vs 329.22±29.11,Pnd TnF-α(80.98±4.47 vs 61.56±4.02,110.85±6.68 vs 89.20±8.48,and 313.37±36.77 vs 267.30±9.31,Pnd evidently decreased the protein levels of IL-10 and STAT3 in gastric mucosal tissues(1

关键词： Yangyin Huowei mixture IL-10/JAK1/STAT3 pathway Chronic atrophic gastritis Inflammatory factor Gastric secretory function

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n-octyl acrylate is a candidate sex pheromone component involved in courtship in parasitoid wasp Microplitis mediator

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Insect Science 2024年第4期31卷 1200-1210页

作者： Yu-Xiao Tao Shuang shan Youssef Dewer shan-ning Wang Adel Khashaveh Rui-Jun Li Yong-Jun Zhang State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina College of Plant Protection Agricultural University of HebeiBaodingHebei ProvinceChina Bioassay Research Department Central Agricultural Pesticide LaboratorySabahia Plant Protection Research StationAgricultural Research CenterAlexandriaEgypt Beijing Key Laboratory of Environment Friendly Management on Fruit Diseases and Pests in north China Institute of Plant ProtectionBeijing Academy of Agriculture and Forestry SciencesBeijingChina

Sex pheromones are considered to play critical roles in partner communication of most parasitic ***,the identification of sex pheromone components remains limited to a few families of parasitoid *** this study,we functionally characterized a candidate sex pheromone component in Microplitis mediator(Hymenoptera:Braconidae),a solitary parasitoid of noctuidae *** found that the body surface extract from female wasps could significantly stimulate courtship behavior of *** chromatography-electroantennographic detection(GC-EAD)analysis revealed that a candidate semiochemical from extract triggered significant electrophysiological response of antennae of *** performing gas chromatography-mass spectrometer(GC-MS)measurement,GC-EAD active compound was identified as n-octyl acrylate,a candidate sex pheromone component in female *** electroantennogram(EAG)tests,antennae of male wasps showed significantly higher electrophysiological responses to n-octyl acrylate than those of females.Y-tube olfactometer assays indicated that male wasps significantly chose n-octyl acrylate compared with the ***,male wasps showed a remarkable preference for n-octyl acrylate in a simulated field condition behavioral trial;simultaneously,n-octyl acrylate standard could also trigger significant courtship behavior in *** propose that n-octyl acrylate,as a candidate vital sex pheromone component,could be utilized to design behavioral regulators of *** to implement the protection and utilization of natural enemies.

关键词： behavioral assay courtship behavior GC-EAD analysis Microplitis mediator sex pheromone

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Unbound^(28)O,the heaviest oxygen isotope observed:a cutting-edge probe for testing nuclear models

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nuclear Science and Techniques 2024年第2期35卷 1-2页

作者： Jian-Guo Li Bai-shan Hu Shuang Zhang Fu-Rong Xu School of Physics and State Key Laboratory of Nuclear Physics and TechnologyPeking UniversityBeijing 100871China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Southern Center for nuclear-Science Theory(SCnT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China

The beyond-dripline oxygen isotopes^(27,28)O were recently observed at RIKEn,and were found to be unbound decaying into^(24)O by emitting *** unbound feature of the heaviest oxygen isotope,^(28)O,provides an excellent test for stateof-the-art nuclear *** atomic nucleus is a self-organized quantum manybody system comprising specific numbers of protons Z and neutrons n.

关键词： testing quantum system

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Efficient Pt/KFI zeolite catalysts for the selective catalytic reduction of nOxby hydrogen

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Journal of Environmental Sciences 2024年第4期138卷 102-111页

作者： Ligang Zhang Yulong shan Zidi Yan Zhongqi Liu Yunbo Yu Hong He School of Rare Earths University of Science and Technology of ChinaHefei 230026China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341119China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Aiming at purification of nO_(x)from hydrogen internal combustion engines(HICEs),the hydrogen selective catalytic reduction(H_(2)-SCR)reaction was investigated over a series of Pt/KFI zeolite catalysts.H_(2)can readily reduce nO_(x)to n_(2)and n_(2)O while O_(2)inhibited the denO_(x)efficiency by consuming the reductant H_(2).The Pt/KFI zeolite catalysts with Pt loading below 0.1wt.% are optimized H_(2)-SCR catalysts due to its suitable operation temperature window since high Pt loading favors the H_(2)-O_(2)reaction which lead to the insufficient of *** to metal Pt^(0)species,Pt^(δ+)species showed lower activation energy of H_(2)-SCR reaction and thought to be as reasonable active ***,Eley-Rideal(E-R)reaction mechanism was proposed as evidenced by the reaction orders in kinetic ***,the optimized reactor was designed with hybrid Pt/KFI catalysts with various Pt loading which achieve a high nO_(x)conversion in a wide temperature range.

关键词： Pt/KFI zeolite Pt loading H_(2)-SCR Reaction conditions Kinetics studies

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