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Deep view of composite SNR CTA1 with LHAASO in γ-rays up to 300 TeV

Science China(Physics,Mechanics & Astronomy) 2025年

作者： Zhen Cao F.Aharonian Axikegu Y.X.Bai Y.w.Bao D.Bastieri X.J.Bi Y.J.Bi w.Bian A.V.Bukevich Q.Cao w.Y.Cao Zhe Cao J.Chang J.F.Chang A.M.chen E.S.chen H.X.chen Liang chen Lin chen Long chen M.J.chen M.L.chen Q.H.chen S.chen S.H.chen S.Z.chen T.L.chen Y.chen N.cheng Y.D.cheng M.C.Chu M.Y.Cui S.w.Cui X.H.Cui Y.D.Cui B.Z.Dai H.L.Dai Z.G.Dai Danzengluobu X.Q.Dong k.k.Duan J.H.Fan Y.Z.Fan J.Fang J.H.Fang k.Fang C.F.Feng H.Feng L.Feng S.H.Feng X.T.Feng Y.Feng Y.L.Feng S.Gabici B.Gao C.D.Gao Q.Gao w.Gao w.k.Gao M.M.Ge T.T.Ge L.S.Geng G.Giacinti G.H.Gong Q.B.Gou M.H.Gu F.L.Guo J.Guo X.L.Guo Y.Q.Guo Y.Y.Guo Y.A.Han O.A.Hannuksela M.Hasan H.H.He H.N.He J.Y.He Y.He Y.k.Hor B.w.Hou C.Hou X.Hou H.B.Hu Q.Hu S.C.Hu C.Huang D.H.Huang T.Q.Huang w.J.Huang X.T.Huang X.Y.Huang Y.Huang Y.Y.Huang X.L.Ji H.Y.Jia k.Jia H.B.Jiang k.Jiang X.w.Jiang Z.J.Jiang M.Jin M.M.kang I.karpikov D.khangulyan D.kuleshov k.kurinov B.B.Li C.M.Li cheng Li Cong Li D.Li F.Li H.B.Li H.C.Li Jian Li Jie Li k.Li S.D.Li w.L.Li w.L.Li X.R.Li Xin Li Y.Z.Li Zhe Li Zhuo Li E.w.Liang Y.F.Liang S.J.Lin B.Liu C.Liu D.Liu D.B.Liu H.Liu H.D.Liu J.Liu J.L.Liu M.Y.Liu R.Y.Liu S.M.Liu w.Liu Y.Liu Y.N.Liu Q.Luo Y.Luo H.k.Lv B.Q.Ma L.L.Ma X.H.Ma J.R.Mao Z.Min w.Mitthumsiri H.J.Mu Y.C.Nan A.Neronov k.C.Y.Ng L.J.Ou P.Pattarakijwanich Z.Y.Pei J.C.Qi M.Y.Qi B.Q.Qiao J.J.Qin A.Raza D.Ruffolo A.Sáiz M.Saeed D.Semikoz L.Shao O.Shchegolev X.D.Sheng F.w.Shu H.C.Song Yu.V.Stenkin V.Stepanov Y.Su D.X.Sun Q.N.Sun X.N.Sun Z.B.Sun J.Takata P.H.T.Tam Q.w.Tang R.Tang Z.B.Tang w.w.Tian L.H.wan C.wang C.B.wang G.w.wang H.G.wang H.H.wang J.C.wang kai wang kai wang L.P.wang L.Y.wang P.H.wang R.wang w.wang X.G.wang X.Y.wang Y.wang Y.D.wang Y.J.wang Z.H.wang Z.X.wang Zhen wang Zheng wang D.M.wei J.J.wei Y.J.wei T.wen C.Y.wu H.R.wu Q.w.wu S.wu X.F.wu Y.S.wu S.Q.Xi J.Xia G.M.Xiang D.X.Xiao G.Xiao Y.L.Xin Y.Xing D.R.Xiong Z.Xiong D.L.Xu R.F.Xu R.X.Xu w.L.Xu L.Xue D.H.Yan J.Z.Yan T.Yan C.w.Yang C.Y.Yang F.Yang F.F.Yang L.L.Yang M.J.Yang R.Z.Yang w.X.Yang Y.H.Yao Z.G.Yao L.Q.Yin N.Yin X.H.You Z.Y.You Y.H Southwest Jiaotong University School of Astronomy and Space Science Nanjing University Center for Astrophysics Guangzhou University Tsung-Dao Lee Institute & School of Physics and Astronomy Shanghai Jiao Tong University Institute for Nuclear Research of Russian Academy of Sciences Hebei Normal University University of Science and Technology of China LHAASO Collaboration State key Laboratory of Particle Detection and Electronics key Laboratory of Dark Matter and Space Astronomy & key Laboratory of Radio Astronomy Purple Mountain Observatory Chinese Academy of Sciences Research Center for Astronomical Computing Zhejiang Laboratory key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical Observatory Chinese Academy of Sciences School of Physics and Astronomy key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center Yunnan University key Laboratory of Cosmic Rays (Tibet University) Ministry of Education Department of Physics The Chinese University of Hong kong key Laboratory of Radio Astronomy and Technology National Astronomical Observatories Chinese Academy of Sciences School of Physics and Astronomy (Zhuhai) & School of Physics (Guangzhou) & Sino-French Institute of Nuclear Engineering and Technology (Zhuhai) Sun Yat-sen University Institute of High Energy Physics Institute of Frontier and Interdisciplinary Science Shandong University APC Université Paris Cité CNRS/IN2P3 CEA/IRFU Observatoire de Paris Department of Engineering Physics & Department of Astronomy Tsinghua University School of Physics and Microelectronics Chinese Academy of Sciences Zhengzhou University Yunnan Observatories Chinese Academy of Sciences China Center of Advanced Science and Technology College of Physics Sichuan University School of Physics Peking University Guangxi key Laboratory for Relativistic Astrophysics School of Physical Science and Technology University of Chinese Academy of Sciences Guangxi University Department of Physics Faculty of Science Mahidol University Moscow Institute

The ultra-high-energy（UHE） gamma-ray source 1LHAASO J0007+7303u is positionally associated with the composite SNR CTA1 that is located at high Galactic Latitude b ≈ 10.5°. This provides a rare opportunity to spatially resolve the component of the pulsar wind nebula（PwN） and supernova remnant（SNR） at UHE. This paper conducted a dedicated data analysis of 1LHAASO J0007+7303u using the data collected from December 2019 to July 2023. This source is well detected with significances of 21σ and 17σ at 8-100 TeV and >100 TeV, respectively. The corresponding extensions are determined to be 0.23°±0.03°and 0.17°±0.03°. The emission is proposed to originate from the relativistic electrons accelerated within the PwN of PSR J0007+7303. The energy spectrum is well described by a power-law with an exponential cutoff function dN/dE =（42.4 ± 4.1）(E/（20 TeV）)-2.31±0.11exp(-E/（110±25 TeV）) TeV-1cm-2s-1in the energy range from 8 to 300 TeV, implying a steady-state parent electron spectrum dNe/dEe∝(Ee/（100 TeV）)-3.13±0.16exp[(-Ee/（373±70 TeV）)2] at energies above ≈ 50 TeV. The cutoff energy of the electron spectrum is roughly equal to the expected current maximum energy of particles accelerated at the PwN terminal shock. Combining the X-ray and gamma-ray emission, the current space-averaged magnetic field can be limited to≈ 4.5 μG. To satisfy the multi-wavelength spectrum and the γ-ray extensions, the transport of relativistic particles within the PwN is likely dominated by the advection process under the free-expansion phase assumption.

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LHAASO detection of very-high-energy γ-ray emission surrounding PSR J0248+6021

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Science China(Physics,Mechanics & Astronomy) 2025年

we report the detection of an extended very-high-energy(VHE) γ-ray source coincident with the location of middle-aged(62.4 kyr) pulsar PSR J0248+6021, by using the LHAASO-wCDA data of live 796 d and LHAASO-kM2A data of live 1216d. A significant excess of γ-ray induced showers is observed both by wCDA in energy bands of 1-25 Te V and kM2A in energy bands of >25 TeV with 7.3σ and 13.5σ, respectively. The best-fit position derived through wCDA data is R.A. = 42.06°± 0.12°and Dec. = 60.24°± 0.13°with an extension of 0.69°±0.15°and that of the kM2A data is R.A.= 42.29°± 0.13°and Dec. =60.38°± 0.07°with an extension of 0.37°±0.07°. No clear extended multiwavelength counterpart of this LHAASO source has been found from the radio band to the GeV band. The most plausible explanation of the VHE γ-ray emission is the inverse Compton process of highly relativistic electrons and positrons injected by the pulsar. These electrons/positrons are hypothesized to be either confined within the pulsar wind nebula or to have already escaped into the interstellar medium, forming a pulsar halo.

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Observation of the γ-ray emission from w43 with LHAASO

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Science China(Physics,Mechanics & Astronomy) 2025年

In this paper, we report the detection of the very-high-energy (VHE, 100 Ge V100 TeV) γ-ray emissions from the direction of the young star-forming region w43, observed by the Large High Altitude Air Shower Observation (LHAASO). The extended γ-ray source was detected with a significance of～16σby kM2A and～17σby wCDA, respectively. The angular extension of this γ-ray source is about 0.5 degrees, corresponding to a physical size of about 50pc. we discuss the origin of the γ-ray emission and possible cosmic ray acceleration in the w43 region using multi-wavelength data. Our findings suggest that w43 is likely another young star cluster capable of accelerating cosmic rays (CRs) to at least several hundred TeV.

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基于复数卷积和注意力机制的并行磁共振成像重建

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北京航空航天大学学报 2025年第1期51卷 85-93页

作者：段继忠肖琛昆明理工大学信息工程与自动化学院昆明650500

针对并行磁共振成像的重建,提出深度复数注意力网络(DCANet)模型。根据磁共振成像数据的复数性质,该模型使用复数卷积替换常规实数卷积;由于并行磁共振成像的数据中每个线圈获取到的数据有所不同,该模型还使用逐通道的注意力机制来重点... 详细信息

针对并行磁共振成像的重建,提出深度复数注意力网络(DCANet)模型。根据磁共振成像数据的复数性质,该模型使用复数卷积替换常规实数卷积;由于并行磁共振成像的数据中每个线圈获取到的数据有所不同,该模型还使用逐通道的注意力机制来重点关注有效特征较多的通道;该模型使用数据一致性层保留采样过程中的原始数据,最终形成级联网络。使用3个不同的采样模式对2个不同磁共振成像数据序列进行实验,实验结果表明:DCANet模型具有较好的重建效果,能够获得更高的峰值信噪比(PSNR)和结构相似性指数(SSIM),以及更低的高频误差范数(HFEN),其中,PSNR相比磁共振成像级联通道注意力网络(MICCAN)、Deepcomplex、双倍频网络(DONet)这3种模型平均分别提高了4.52 dB、2.30 dB和1.21 dB。

关键词：并行磁共振成像图像重建深度学习复数卷积网络注意力机制

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LncRNAs:expanding horizons in drug development and disease treatment Author links open overlay panel

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Science Bulletin 2025年第3期70卷 287-289页

作者： Zhizhuo wang Junfeng wang wenfei wu chengyu Shi Ying wang Yu chen Fangzhou Liu Shanshan Xie Aifu Lin International School of Medicine International Institutes of MedicineThe 4th Affiliated Hospital of Zhejiang University School of MedicineYiwu 322000China MOE Laboratory of Biosystem Homeostasis and Protection College of Life SciencesZhejiang UniversityHangzhou 310058China Children’s Hospital Zhejiang University School of MedicineNational Clinical Research Center for Child HealthHangzhou 310052China Department of Cell Biology Zhejiang University School of MedicineHangzhou 310058China Cancer Center Zhejiang UniversityHangzhou 310058China key Laboratory for Cell and Gene Engineering of Zhejiang Province Hangzhou 310058China Future Health Laboratory Innovation Center of Yangtze River DeltaZhejiang UniversityJiaxing 314100China key Laboratory of Cancer Prevention and Intervention China National Ministry of EducationHangzhou 310009China Faculty of Health Sciences University of MacaoMacao 999078China

Extensive genome profiling studies have identified thousands of long non-coding RNAs(lncRNAs)associated with human *** are emerging elements through which the complex process of cancer development and progression can be ***,it is crucial to include an examination of lncRNAs when studying human cancer,especially when researching the clinical challenges of relapse and recurrence following targeted therapy[1].

关键词： horizon expanding treatment

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Potassium ions and cyano group modified g-C_(3)N_(4) for effective generation of H_(2)O_(2) through two-electron oxygen reduction

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Science China Chemistry 2025年第1期68卷 192-200页

作者： Dongying wang Shulan Pu Yongmin chen ke Lei Yujie Duan Linjiao Mao Xuhui Zeng Xi Luo Yuntao Zhang Yuqin Dong Jin Zhong Zhang Yan Sun School of Mechanical Engineering Chengdu UniversityChengdu 610106China Department of Chemistry and Biochemistry University of CaliforniaSanta CruzCA 95064USA

Potassium ions(k^(+))doped graphitic carbon nitride(g-C_(3)N_(4))was prepared by a thermal etching method using potassium hydroxide(kOH)as an ion *** transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS)results showed that the generation of the cyano group was detected while introducing k^(+).Under simulated sunlight irradiation,the sample with a k^(+)doping amount of 10%showed the highest hydrogen peroxide(H_(2)O_(2))generation rate of2,140.2μmol h^(-1)g^(-1).The apparent quantum yield(AQY)at 400 nm and the solar-to-chemical conversion(SCC)are 4.35%and1.23%,respectively.k^(+)acted as a bridge between g-C_(3)N_(4)layers,which enhanced charge transfer ***,the cyano group enhanced the adsorption capacity of protons(H^(+))and promoted the yield of H_(2)O_(2).The catalyst exhibited excellent photocatalytic stability based on four-cycle *** addition,a mechanism study showed that superoxide radicals(·O_(2)^(-))were the most important active species in the reaction *** production of H_(2)O_(2)was achieved through consecutive single-electron *** study deepens the understanding of the oxygen reduction reaction process and opens up a new venue for improving H_(2)O_(2)generation.

关键词： photocatalysis hydrogen peroxide oxygen reduction reaction potassium doping cyano group

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Emerging organic carbonyl small molecules cathode materials in alkali-ion batteries: Principles, recent progresses, strategies and prospects

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Progress in Natural Science:Materials International 2025年第01期 31-50页

作者： Suping chen Xijun Xu Tao Yang weizhen Fan Jingwei Zhao Yanping Huo School of Chemical Engineering and Light Industry Guangdong University of Technology Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center Research and Development Center Guangzhou Tinci Materials Technology Co. Ltd. Analytical&Testing Center Guangdong University of Technology

Carbonyl small molecule compounds hold great potential as cathode materials for alkali-ion batteries（AIBs） due to their environmental friendliness, structural designability, and high theoretical capacity. However, it's practical application is hindered by intrinsic drawbacks, such as low electrical conductivity and high solubility in organic electrolytes. Additionally, most carbonyl small molecule cathodes can't be charged first in half-cells due to the absence of detachable Li+/Na+/k+ions, diminishing their appeal when assembled into full cells with alkali-free anodes. This review provides a detailed overview of carbonyl-contained small molecule cathode materials centered around oxygen, including their charge storage mechanisms, solutions to overcome their drawbacks, and the latest research advancements in AIBs. This review also summarizes the electrochemical performance of carbonyl small molecules as cathodes that have been assembled in batteries. Finally, the review outlines the prospects and directions for future research on carbonyl small molecule cathodes. It is hoped that this review will offer meaningful guidance for the development of carbonyl small-molecule cathode materials in AIBs.

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BEHAVIOR OF FLOw STRESS OF ALUMINUM SHEETS USED FOR PRESSURE CAN DURING COMPRESSION AT ELEVATED TEMPERATURE

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Acta Metallurgica Sinica(English Letters) 2005年第6期18卷 756-762页

作者： G.S. Fu w.Z. chen k. w. Qian School of Mechanical Engineering Fuzhou University Fuzhou 350002 China

The behavior of flow stress of Al sheets used for pressure can prepared by different melt-treatment during plastic deformation at elevated temperature was studied by isothermal compression test using Gleeble1500 dynamic hot-simulation testing machine. The results show that the AI sheets possess the remarkable characteristic of steady state flow stress when they are deformed in the temperature range of 350-500℃ at strain rates within the range of 0.01-10.0s^-1. A hyperbolic sine relationship is found to correlate well the flow stress with the strain rate, and an Arrhenius relationship with the temperature, which implies that the process of plastic deformation at elevated temperature for this material is thermally activated. Compared with the AI pieces prepared by no or conventional melt-treatment, hot deformation activation energy of AI sheets prepared by high-efficient melt-treatment is the smallest （ Q= 168.0kJ/mol）, which reveals that the hot working formability of this material is very better, and has directly to do with the effective improvement of its metallurgical quality.

关键词： Al sheets used for can melt-treatment plastic deformation at elevatedtemperature flow stress hot deformation activation energy

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Boosting hydrogen evolution via work-function-accelerated electronic reconfiguration of Mo-based heterojunction

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Science China Materials 2025年第1期68卷 189-198页

作者： Xiang chen Shuai Feng Song Xie Yaping Miao Biao Gao Xuming Zhang Li Huang Yun Li Paul k.Chu Xiang Peng Hubei key Laboratory of Plasma Chemistry and Advanced Materials Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationSchool of Materials Science and EngineeringWuhan Institute of TechnologyWuhan 430205China Department of Physics Department of Materials Science and Engineeringand Department of Biomedical EngineeringCity University of Hong KongHong Kong 999077China School of Textile Science and Engineering Xi’an Polytechnic UniversityXi’an 710048China The State key Laboratory of Refractories and Metallurgy Institute of Advanced Materials and NanotechnologyWuhan University of Science and TechnologyWuhan 430081China Guizhou wujiang Hydropower Development Co. Ltd.Guiyang 550002China

Molybdenum-based catalysts have demonstrated significant potential in the electrocatalytic hydrogen evolution reaction(HER).However,the limited exposure of active sites and strong hydrogen adsorption result in suboptimal ***,a Mo_(2)N±MoSe_(2) heterojunction is prepared on carbon cloth(MNS/CC)to enhance the *** strong electronic interaction between Mo_(2)N and MoSe_(2),combined with the lower work function of Mo_(2)N,creates an intrinsic electric field at the heterojunction interface,which markedly improves charge transfer ***,the optimized electronic structure of Mo sites further enhances charge transfer and intrinsically catalytic activity in *** a result,MNS/CC requires overpotentials of mere 65 and 210 mV to achieve current densities of 20 mA cm^(−2) and 1 A cm^(−2),respectively,with a Tafel slope of only 96 mV dec−***,MNS/CC maintains stable operation at 1 A cm^(−2) for 240 h without significant *** results offer insights into the design of non-precious metal-based electrocatalysts for industrial hydrogen production.

关键词： water splitting hydrogen evolution reaction molybdenum-based catalyst heterojunction electronic interaction

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Epigenetic basis for the establishment of ruminal tissue-specific functions in bovine fetuses and adults

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Journal of Genetics and Genomics 2025年第1期52卷 78-92页

作者： Jing wang wen Yuan Fang Liu Guangbo Liu Xiaoxiong Geng chen Li chenchen Zhang Nan Li Xueling Li State key Laboratory of Reproductive Regulation&Breeding of Grassland Livestock Research Center for Laboratory Animal ScienceInner Mongolia UniversityHohhotInner Mongolia 010070China College of Chemistry and Chemical Engineering Engineering Research Center of Dairy Quality and Safety Control TechnologyMinistry of EducationInner Mongolia UniversityHohhotInner Mongolia 010070China

Epigenetic regulation in the rumen,a unique ruminant organ,remains largely unexplored compared with other tissues studied in model *** this study,we perform an in-depth analysis of the epigenetic and transcriptional landscapes across fetal and adult bovine tissues as well as pluripotent stem *** the extensive methylation differences across various stages and tissues,we identify tissue-specific differentially methylated regions(tsDMRs)unique to the rumen,which are crucial for regulating epithelial development and energy *** tsDMRs cluster within super-enhancer regions that overlap with transcription factor(TF)binding *** models indicate that DNA methylation,along with H3k27me3 and H3k27ac,can be used to predict enhancer *** upstream TFs,including SOX2,FOSL1/2,and SMAD2/3,primarily maintain an inhibitory state through bivalent modifications during fetal *** functional genes are maintained mainly in a stable repressive state via DNA methylation until differentiation is *** study underscores the critical role of tsDMRs in regulating distal components of rumen morphology and function,providing key insights into the epigenetic regulatory mechanisms that may influence bovine production traits.

关键词： Rumen Epigenetics DNA methylation tsDMRs Enhancers

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