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Evidence for particle acceleration approaching PeV energies in the W51 complex

science Bulletin 2024年第18期69卷 2833-2841页

作者： Cao, Zhen Aharonian, F. Axikegu Bai, Y.X. Bao, Y.W. Bastieri, D. Bi, X.J. Bi, Y.J. Bian, W. Bukevich, A.V. Cao, Q. Cao, W.Y. Cao, Zhe Chang, J. Chang, J.F. Chen, 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. Cheng, N. Cheng, Y.D. Cui, M.Y. Cui, s.W. Cui, X.h. Cui, Y.D. Dai, B.Z. Dai, h.L. Dai, Z.G. Danzengluobu Dong, X.Q. Duan, K.K. Fan, J.h. Fan, Y.Z. Fang, J. Fang, J.h. Fang, K. feng, C.F. feng, h. feng, L. feng, s.h. feng, X.T. feng, Y. feng, Y.L. Gabici, s. Gao, B. Gao, C.D. Gao, Q. Gao, W. Gao, W.K. Ge, M.M. Geng, L.s. Giacinti, G. Gong, G.h. Gou, Q.B. Gu, M.h. Guo, F.L. Guo, X.L. Guo, Y.Q. Guo, Y.Y. han, Y.A. hasan, M. he, h.h. he, h.N. he, J.Y. he, Y. hor, Y.K. hou, B.W. hou, C. hou, X. hu, h.B. hu, Q. hu, s.C. huang, D.h. huang, T.Q. huang, W.J. huang, X.T. huang, X.Y. huang, Y. Ji, X.L. Jia, h.Y. Jia, K. Jiang, K. Jiang, X.W. Jiang, Z.J. Jin, M. Kang, M.M. Karpikov, I. Kuleshov, D. Kurinov, K. Li, 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, X.R. Li, Xin Li, Y.Z. Li, Zhe Li, Zhuo Liang, E.W. Liang, Y.F. Lin, s.J. Liu, 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. Luo, Q. Luo, Y. Lv, h.K. Ma, B.Q. Ma, L.L. Ma, X.h. Mao, J.R. Min, Z. Mitthumsiri, W. Mu, h.J. Nan, Y.C. Neronov, A. Ou, L.J. Pattarakijwanich, P. Pei, Z.Y. Qi, J.C. Qi, M.Y. Qiao, B.Q. Qin, J.J. Raza, A. Ruffolo, D. sáiz, A. saeed, M. semikoz, D. shao, L. shchegolev, O. sheng, X.D. shu, F.W. song, h.C. stenkin, Yu.V. stepanov, V. su, Y. sun, D.X. sun, Q.N. sun, X.N. sun, Z.B. Takata, J. Tam, P.h.T. Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China University of Chinese Academy of sciences Beijing 100049 China TIANFU Cosmic Ray Research Center Chengdu China Dublin Institute for Advanced studies 31 Fitzwilliam Place 2 Dublin Ireland Max-Planck-Institut for Nuclear Physics P.O. Box 103980 Heidelberg 69029 Germany s.h.ol of Physical science and Technology & s.h.ol of Information science and Technology Southwest Jiaotong University Chengdu 610031 China s.h.ol of Astronomy and space science Nanjing University Nanjing 210023 China Center for Astrophysics Guangzhou University Guangzhou 510006 China Tsung-Dao Lee Institute & s.h.ol of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Institute for Nuclear Research of Russian Academy of sciences Moscow 117312 Russia hebei Normal University Shijiazhuang 050024 China University of science and Technology of China Hefei 230026 China state Key Laboratory of Particle Detection and Electronics China Key Laboratory of Dark Matter and space Astronomy & Key Laboratory of Radio Astronomy Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210023 China Research Center for Astronomical Computing Zhejiang Laboratory Hangzhou 311121 China Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China s.h.ol of Physics and Astronomy Yunnan University Kunming 650091 China Key Laboratory of Cosmic Rays (Tibet University) Ministry of Education Lhasa 850000 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100101 China s.h.ol of Physics and Astronomy (Zhuhai) & s.h.ol of Physics (Guangzhou) & sino-French Institute of Nuclear Engineering and Technology (Zhuhai) Sun Yat-sen University Zhuhai 519000 & Guangzhou 510275 Guangdong China Institute of Frontier and

The γ-ray emission from the W51 complex is widely acknowledged to be attributed to the interaction between the cosmic rays (CRs) accelerated by the shock of supernova remnant (sNR) W51C and the dense molecular clouds in the adjacent star-forming region, W51B. however, the maximum acceleration capability of W51C for CRs remains elusive. Based on observations conducted with the Large high Altitude Air shower Observatory (LhAAsO), we report a significant detection of γ rays emanating from the W51 complex, with energies from 2 to 200 TeV. The LhAAsO measurements, for the first time, extend the γ-ray emission from the W51 complex beyond 100 TeV and reveal a significant spectrum bending at tens of TeV. By combining the "π0-decay bump" featured data from Fermi-LAT, the broadband γ-ray spectrum of the W51 region can be well-characterized by a simple pp-collision model. The observed spectral bending feature suggests an exponential cutoff at ∼400 TeV or a power-law break at ∼200 TeV in the CR proton spectrum, most likely providing the first evidence of sNRs serving as CR accelerators approaching the PeV regime. Additionally, two young star clusters within W51B could also be theoretically viable to produce the most energetic γ rays observed by LhAAsO. Our findings strongly support the presence of extreme CR accelerators within the W51 complex and provide new insights into the origin of Galactic CRs. © 2024 science China Press

关键词： Cosmic rays

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h-and J-aggregation of conjugated small molecules in organic solar cells

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Journal of Energy Chemistry 2024年第6期93卷 174-192,I0005页

作者： Qiaoqiao Zhao feng he state Key Laboratory of Biobased Material and Green Papermaking Qilu University of TechnologyShandong Academy of SciencesJinan 250353ShangdongChina shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and TechnologyShenzhen 518055GuangdongChina Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and TechnologyShenzhen 518055GuangdongChina

As.h.and J-aggregation receive more and more attention in the research of organic solar cells(OsCs),especially in small molecular systems,deep understanding of aggregation behavior is needed to guide the design of conjugated small molecular structure and the fabrication process of OsC *** this end,this review is ***,the review firstly introduced the basic information about h-and J-aggregation of conjugated small molecules in ***,the characteristics of h-and J-aggregation and the methods to identify them were ***,it reviewed the research progress of h-and J-aggregation of conjugated small molecules in OsCs,including the factors influencing h-and J-aggregation in thin film and the effects of h-and J-aggregation on OPV performance.

关键词： h-aggregation J-aggregation Organic solar cells small molecules Efficiency stability

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Oxygen vacancy boosting Fenton reaction in bone scaffold towards fighting bacterial infection

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International Journal of Extreme Manufacturing 2024年第1期6卷 296-311页

作者： Cijun shuai Xiaoxin shi feng Yang haifeng Tian Pei feng state Key Laboratory of Precision Manufacturing for Extreme service Performance College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083People’s Republic of China Institute of Additive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013People’s Republic of China College of Mechanical Engineering Xinjiang UniversityUrumqi 830017People’s Republic of China

Bacterial infection is a major issue after artificial bone transplantation due to the absence of antibacterial function of bone scaffold,which seriously causes the transplant failure and even amputation in severe *** this study,oxygen vacancy(OV)defects Fe-doped Ti O2(OV-FeTiO2)nanoparticles were synthesized by nano TiO2and Fe3O4via high-energy ball milling,which was then incorporated into polycaprolactone/polyglycolic acid(PCLGA)biodegradable polymer matrix to construct composite bone scaffold with good antibacterial activities by selective laser *** results indicated that OV defects were introduced into the core/shell-structured OV-FeTiO2nanoparticles through multiple welding and breaking during the high-energy ball milling,which facilitated the adsorption of hydrogen peroxide(h2O2)in the bacterial infection microenvironment at the bone transplant *** accumulated h2O2could amplify the Fenton reaction efficiency to induce more hydroxyl radicals(·Oh),thereby resulting in more bacterial deaths through·Oh-mediated oxidative *** antibacterial strategy had more effective broad-spectrum antibacterial properties against Gram-negative Es.h.richia coli(***)and Gram-positive staphylococcus aureus(***).In addition,the PCLGA/OV-FeTiO2scaffold possessed mechanical properties that match those of human cancellous bone and good biocompatibility including cell attachment,proliferation and osteogenic differentiation.

关键词： bacterial infection bone scaffold selective laser sintering Fenton reaction antibacterial properties

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Editorial for Multiscale&Multifield Coupling in Geomechanics

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 1919-1921页

作者： Min Wang Pengzhi Pan Andrew h.C.Chan Y.T.feng T-3 Fluid Dynamics and solid Mechanics Theoretical DivisionLos Alamos National LaboratoryNew MexicoUSA Institute of Rock and soil Mechanics Chinese Academy of SciencesWuhanChina s.h.ol of Engineering University of TasmaniaTasmaniaAustralia College of Engineering Swansea UniversityWalesUK

We are delighted to serve as guest editors for this special issue in the Journal of Rock Mechanics and Geotechnical *** purpose of this special issue is dedicated to gathering the latest research work on Multiscale&Multifield Coupling in Geomechanics,where we delve into the intricate interplay of various fields and scales that govern the behavior of *** total,30 manuscripts from UsA,China,UK,Germany,Canada,India and United Arab Emirates are selected to be included in this issue.

关键词： materials. gathering mechanics

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An effective bimetallic oxide catalyst of RuO_(2)-Co_(3)O_(4) for alkaline overall water splitting

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Nano Research 2024年第5期17卷 3785-3793页

作者： Fangfang Ren Jiayu Xu Ligang feng College of Chemical and Environmental Engineering Yancheng Teachers UniversityYancheng 224007China s.h.ol of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

The rational design of effective bifunctional electrocatalysts is of paramount importance for overall water-splitting technology in sustainable energy ***,bimetallic oxide catalysts(RuO_(2)-Co_(3)O_(4))derived from Ru combined MOF-derivatives(MOF=metal-organic framework)were demonstrated effective for overall water splitting in an alkaline solution,owing to the combined merits such as the two-dimensional interconnected network structure,the synergetic coupling effects and increased chemical *** as-prepared RuO_(2)-Co_(3)O_(4) only requires an overpotential of 260 mV for oxygen evolution and 75 mV for hydrogen evolution at 10 mA/cm^(2) in 1 M KOh solution;a low cell voltage of 1.54 V was required to reach the kinetic current density of 10 mA/cm^(2) for the water electrolysis when supporting on glass carbon electrode,and very good stability for 40 h was *** and theoretical results demonstrated the electronic structure optimization of bimetallic RuO_(2)-Co_(3)O_(4) compared to the individual metal oxide,which promoted interface charges redistribution and the d-band center downshift,resulting in increased activity and stability for water-splitting *** work provides a feasible approach for developing bimetallic oxides for application in energy-relevant electrocatalysis reactions.

关键词： ruthenium dioxide cobalt oxide metal-organic frameworks heterostructures overall water splitting

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Plasma-assisted ammonia synthesis under mild conditions for hydrogen and electricity storage:Mechanisms,pathways,and application prospects

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Frontiers in Energy 2024年第4期18卷 418-435页

作者： feng GONG Yuhang JING Rui XIAO Key Laboratory of Energy Thermal Conversion and Process Measurement and Control of the Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

Ammonia,with its.h.gh hydrogen storage density of 17.7 wt.%(mass fraction),cleanliness,efficiency,and renewability,presents itself as a promising zero-carbon ***,the traditional haber−Bos.h.h−B)process for ammonia synthesis necessitates.h.gh temperature and pressure,resulting in over 420 million tons of carbon dioxide emissions annually,and relies on fossil fuel *** contrast,dielectric barrier dis.h.rge(DBD)plasma-assisted ammonia synthesis operates at low temperatures and atmos.h.ric pressures,utilizing nitrogen and hydrogen radicals excited by energetic electrons,offering a potential alternative to the h−B *** method can be effectively coupled with renewable energy sources(such as solar and wind)for environmentally friendly,distributed,and efficient ammonia *** review delves into a comprehensive analysis of the low-temperature DBD plasma-assisted ammonia synthesis technology at atmos.h.ric pressure,covering the reaction pathway,mechanism,and catalyst system involved in plasma nitrogen *** from current research,it evaluates the economic feasibility of the DBD plasmaassisted ammonia synthesis technology,analyzes existing dilemmas and challenges,and provides insights and recommendations for the future of nonthermal plasma ammonia processes.

关键词： plasma catalysis nitrogen fixation ammonia synthesis hydrogen storage catalyst carbon neutralization

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honokiol Prevents Intestinal Barrier Dysfunction in Mice with severe Acute Pancreatitis and Inhibits JAK/sTAT1 Pathway and Acetylation of hMGB1

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Chinese Journal of Integrative Medicine 2024年第6期30卷 534-542页

作者： LI Jie ChEN Ya-feng GAO Lei LI Yi-jie feng Dian-xu Department of General surgery Putuo HospitalShanghai University of Traditional Chinese MedicineShanghai200062China

Objective To investigate the effect of honokiol(hON)and the role of high-mobility group protein B1(hMGB1)on the pathogenesis of severe acute pancreatitis(sAP).Methods Thirty mice were numbered according to weight,and randomly divided into 5 groups using a random number table,including control,sAP,sAP and normal saline(sAP+Ns),sAP and ethyl pyruvate(sAP+EP),or sAP+hON groups,6 mice in each *** of pancreas,intestine,and blood were collected 12 h after sAP model induction for examination of pathologic changes,immune function alterations by enzyme linked immunosorbent assay(ELIsA),and Western *** vitro experiments,macrophages were divided into 5 groups,the control,lipopolysaccharide(LPs),LPs+DMsO(DMsO),LPs+anti-hMGB1 monoclonal antibody(mAb),and LPs.h.N *** tight connection level was determined by transmission electron microscopy and fluorescein *** location and acetylation of hMGB1 were measured by Western ***,pyridone 6 and silencing signal transducer and activator of the transcription 1(sisTAT1)combined with honokiol were added to determine whether the Janus kinase(JAK)/sTAT1 participated in the regulation of honokiol on *** protein expression levels of hMGB1,JAK,and sTAT1 were detected using Western *** Mice with sAP had inflammatory injury in the pancreas,bleeding of intestinal tissues,and cells with disrupted *** in the sAP+hON group had significantly fewer pathological *** with sAP also had significant increases in the serum levels of amylase,lipase,hMGB1,tumor necrosis factor-α,interleukin-6,diamine oxidase,endotoxin-1,and *** in the sAP+hON group did not show these abnormalities(Pstudies of Caco-2 cells indicated that LPs increased the levels of occludin and claudin-1 as well as tight junction permeability,decreased the levels of junctional adhesion molecule C,and elevated intercellular permeability(PhON treatment blocked these *** of

关键词： severe acute pancreatitis intestinal barrier dysfunction honokiol high-mobility group protein B1 Januskinase signal transducerand activatorof transcription1

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Attractor for the Extensible Beam Equation with Nonlocal Weak Damping on Time–Dependent space

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Acta Mathematica sinica,English series 2024年第4期40卷 1115-1126页

作者： Chun Xiang ZhAO feng Juan MENG Institute of Applied system Analysis Jiangsu UniversityZhenjiang 212013P.R.China s.h.ol of Mathematics and Physics Jiangsu University of TechnologyChangzhou 213001P.R.China

In this article,we consider the long-time behavior of extensible beams with nonlocal weak damping:ε(t)u_(tt)+Δ^(2)u-m(‖▽u‖^(2))Δu+‖u_(t)‖^(p_(u_(t)))+f(u)=h,whereε(t)is a decreasing function vanishing at *** the theory of process on time-dependent spaces,we investigate the existence of the time-dependent attractor by using the Condition(C_(t))method and more detailed *** results obtained essentially improve and complete some previous works.

关键词： Time-dependent attractor extensible beams equation nonlocal weak damping

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Impacts of pancreatic exocrine insufficiency on gut microbiota

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Journal of Zhejiang University-science B(Biomedicine & Biotechnology) 2024年第4期25卷 271-279页

作者： Yulin GUO feng CAO Fei LI Department of General surgery Xuanwu Hospital of Capital Medical UniversityBeijing 100053China Acute Pancreatitis Clinical Center of Capital Medical University Beijing 100053China

Pancreatic exocrine insufficiency(PEI)can be induced by various kinds of diseases,including chronic pancreatitis,acute pancreatitis,and *** main pathogenetic mechanism of PEI involves the decline of trypsin synthesis,disorder of pancreatic fluid flow,and imbalance of secretion *** studies.h.ve shown that PEI could induce gut bacterial overgrowth and dysbiosis,with the abundance of Lactobacillus and Bifidobacterium increasing the most,which could be partially reversed by pancreatic enzyme replacement *** studies.h.ve also confirmed the association between PEI and the dysbiosis of gut *** exocrine secretions and changes in duodenal p h as well as bile salt malabsorption brought about by PEI may affect and shape the abundance and composition of gut *** turn,the gut microbiota may impact the pancreatic exocrine acinus through potential bidirectional *** forward,more and higher-quality studies are needed that focus on the mechanism underlying the impact of PEI on the gut microbiota.

关键词： Pancreatic exocrine insufficiency Gut microbiota Gut microbiome Pancreatic enzyme replacement therapy

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Effect of hot isostatic pressure on the microstructure and tensile properties of γ'-strengthened superalloy fabricated through induction-assisted directed energy deposition

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 1089-1097页

作者： Jianjun Xu hanlin Ding Xin Lin feng Liu Analytical&Testing Center Northwestern Polytechnical UniversityXi’an 710072China state Key Laboratory of solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

The microstructure characteristics and strengthening mechanism of Inconel738LC(IN-738LC) alloy prepared by using induction-assisted directed energy deposition(IDED) were elucidated through the investigation of samples subjected to IDED under 1050℃ preheating with and without hot isostatic pressing(hIP,1190℃,105 MPa,and 3 h).Results show that the as-deposited sample mainly consisted of epitaxial columnar crystals and inhomogeneously distributed γ’ phases in interdendritic and dendritic core *** hIP,grain morphology changed negligibly,whereas the size of the γ’ phase became increasingly *** further heat treatment(hT,1070℃,2 h + 845℃,24 h),the γ’ phase in the as-deposited and hIPed samples presented a bimodal size distribution,whereas that in the as-deposited sample showed a size that remained *** comparison of tensile properties revealed that the tensile strength and uniform elongation of the hIP + hTed sample increased by 5% and 46%,respectively,due to the synergistic deformation of bimodal γ’phases,especially large cubic γ’ ***,the relationship between phase transformations and plastic deformations in the IDEDed sample was discussed on the basis of generalized stability theory in terms of the trade-off between thermodynamics and kinetics.

关键词： directed energy deposition Ni-based superalloys high-temperature preheating hot isostatic pressing microstructure tensile properties

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