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Observation of the γ-ray emission from w43 with LhAASO

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

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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基于特征选择的NGO-RF热轧h型钢水平辊轧制力预测

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锻压技术 2025年第1期50卷 122-133页

作者：臧德宇吴龙林太阳潘建洲福建农林大学机电工程学院三明学院机电工程学院北京科技大学材料科学与工程学院福建三钢(集团)有限公司

为了得到较为精确的水平辊轧制力，收集福建罗源闽光钢铁轧钢厂的实际轧制参数，并进行相关参数计算与预处理，构建包含多输入特征及多规格的h型钢水平辊轧制力数据集。为有效预测h型钢的水平辊轧制力，首先，运用孤立森林算法和树模型... 详细信息

为了得到较为精确的水平辊轧制力，收集福建罗源闽光钢铁轧钢厂的实际轧制参数，并进行相关参数计算与预处理，构建包含多输入特征及多规格的h型钢水平辊轧制力数据集。为有效预测h型钢的水平辊轧制力，首先，运用孤立森林算法和树模型进行离群点检测与特征选择；其次，划分数据集并采用随机森林模型作为基础模型进行训练与验证；再次，应用北方苍鹰优化算法优化随机森林模型；最后，输入处理后的h型钢水平辊轧制力测试集数据，输出轧制力预测值。将所建模型(NGO-RF)与未经优化的随机森林模型、支持向量机模型、多层感知神经网络模型、卷积神经网络模型，以及经过北方苍鹰优化算法优化的支持向量机模型和多层感知神经网络模型对比，结果显示，所建模型在预测性能上优于上述所有模型，具有较高的准确性与适用性。此外，利用所建模型对h型钢588 mm×300 mm×12 mm×20 mm新规格产品的轧制力进行预测，对比模型预测值与实测值，平均误差仅为6.05%,进一步证实了所建模型能够较好地实现对h型钢水平辊轧制力的预测。

关键词： h型钢水平辊轧制力随机森林北方苍鹰优化算法特征选择

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Deep ResNet Strategy for the Classification of wind Shear Intensity Near Airport Runway

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Computer Modeling in Engineering & Sciences 2025年第2期142卷 1565-1584页

作者： Afaq Khattak Pak-wai Chan Feng Chen Abdulrazak h.Almaliki Department of Civil Structural and Environmental EngineeringTrinity College DublinDublinD02 PN40Ireland hong Kong Observatory 134A Nathan RoadKowloonHong Kong999077China College of Transportation Engineering Tongji UniversityShanghai201804China Department of Civil Engineering College of EngineeringTaif UniversityTaif21944Saudi Arabia

Intense wind shear(I-wS)near airport runways presents a critical challenge to aviation safety,necessi-tating accurate and timely classification to mitigate risks during takeoff and *** study proposes the application of advanced Residual Network(ResNet)architectures including ResNet34 and ResNet50 for classifying I-wS and Non-Intense wind Shear(NI-wS)events using Doppler Light Detection and Ranging(LiDAR)data from hong Kong International Airport(hKIA).Unlike conventional models such as feedforward neural networks(FNNs),convolutional neural networks(CNNs),and recurrent neural networks(RNNs),ResNet provides a distinct advantage in addressing key challenges such as capturing intricate wS dynamics,mitigating vanishing gradient issues in deep architectures,and effectively handling class imbalance when combined with Synthetic Minority Oversampling Technique(SMOTE).The analysis results revealed that ResNet34 outperforms other models with a Balanced Accuracy of 0.7106,Probability of Detection of 0.8271,False Alarm Rate of 0.328,F1-score of 0.7413,Matthews Correlation Coefficient of 0.433,and Geometric Mean of 0.701,demonstrating its effectiveness in classifying I-wS *** findings of this study not only establish ResNet as a valuable tool in the domain of wS classification but also provide a reliable framework for enhancing operational safety at airports.

关键词： Aviation safety wind shear deep residual network Doppler LiDAR

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The effect of cation size(h^+, Li^+, Na^+, and K^+) on McLafferty-type rearrangement of even-electron ions in mass spectrometry

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Science China Chemistry 2014年第5期57卷 662-668页

作者： ChAI YunFeng pan YuanJiang Department of Chemistry Zhejiang University

Protonation and alkali-metal cation adduction are the most important ionization processes in soft-ionization mass *** on the fragmentation mechanism of protonated and alkali-metal-cationized compounds in tandem mass spectrometry are essential and helpful for structural *** some cases,it was often observed that a compound attached by different alkali-metal cations(or proton)exhibits similar fragmentation patterns but the relative abundances of product ions are *** difference was considered to derive from the different electrostatic interactions of alkali-metal cations(or the bonded effect of proton)with the *** alkali-metal cation with a smaller ionic radius shows stronger electrostatic interaction with the molecule because of its higher charge *** addition,the bonded effect of the proton is stronger than the electrostatic interaction of the alkali-metal *** the present study,which used McLafferty-type rearrangements of even-electron ions([M+Cat]+,Cat=h,Li,Na,K)as model reactions,the effect of cation size in mass spectrometric fragmentation reactions is *** considerations were also successfully applied to interpret the similar but distinct fragmentation behavior of proton and alkali-metal cation adducts of a synthetic compound(2-(acetamido(phenyl)methyl)-3-oxobutanoate)and a drug(entecavir).

关键词： even-electron ion alkali-metal cation McLafferty rearrangement charge-remote fragmentation ionic radius

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Effects of Cerium-Rich Rare Earth and Al-Ti-B Composite Addition on Microstructure and Mechanical Properties of Al-Mg-Si Alloys

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稀有金属材料与工程 2025年第1期54卷 50-61页

作者： Chong Yufan Du Zhaoxin Gong Tianhao Sun Baoan pan Zheru Qi Lele Xie Chengcheng Cheng Jun School of Materials Science and Engineering Inner Mongolia University of TechnologyHohhot 010051China Institute of Physics Chinese Academy of SciencesBeijing 100190China Northwest Institute for Nonferrous Metal Research Xi'an 710016China

Modification of 6061 aluminum alloy was conducted through composite addition of cerium-rich rare earths and *** show that the composite addition of Al-Ti-B and Ce/La element at a specific ratio notably promotes the refinement of the alloy's *** and La elements are combined with Si and other elements to form rare earth phases,improving the morphology and distribution of precipitates and mitigating the adverse effects ofβ-Fe phases on the microstructure and mechanical properties of ***,excessive rare earth content poses challenges;it not only leads to a decrease in Mg-Si strengthening phase by binding with Si but also promotes the formation of larger or numerous rare earth phases that may act as initiation points for cracks,thereby impeding the improvement of the structure and performance of *** composite addition of cerium-rich rare earths and Al-Ti-B not only preserves the strength of the alloy but also significantly enhances the plasticity of the 6061 as-cast *** a composite addition ratio of Al-Ti-B:RE=2:1,the newly developed 6061-RE aluminum alloy exhibits increased average elongation by 50%and 45%in its as-cast and homogenized states,respectively,compared to the baseline 6061 alloy,facilitating subsequent deformation *** solution treatment at 540℃for 1 h and aging at 180℃for 5 h,the average ultimate tensile strength and yield strength of 6061-RE alloys reach 313.2 and 283.1 MPa,increased by 12.3%and 14.5%compared with those of the original alloy,respectively,and the average elongation is improved by 41%.

关键词： rare earth alloy Al-Mg-Si alloy cerium-rich rare earth mechanical property microstructure

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Tuning the morphologies of SiC nanowires via the change of the Co_xSi_y melts

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Nano-Micro Letters 2010年第1期2卷 11-17页

作者： J.J.Chen Y.pan w.h.Tang Q.Shi Department of Physics Center for Optoelectronics Materials and Devices Zhejiang Sci-Tech University Department of Materials Science and Engineering Zhejiang University Key Laboratory of Advanced Textile Materials and Manufacturing Technology (Zhejiang Sci-Tech University) Ministry of education

SiC nanowires and SiC/SiO2 core-shell structural nanowires were synthesized via a simple thermal evaporation of CoxSiy melts at the temperature of 1500?C. The morphologies and yields of those SiC nanowires can be tuned by altering the composition of CoxSiy. Nanowires obtained by thermal evaporation of Co Si are composed of SiC/SiO2 core-shell nanostructures with lengths up to several hundreds of micrometers, diameters of 4050 nm, and the thickness of amorphous SiO2 wrapping shell about 20 nm. SiC nanowires prepared by thermal evaporation of Co Si2 and Co2 Si melt are found to be hexagonal-prism-shaped nanorods, and the diameter of those nanorods is about 150 nm and the length is about 10 microns. All the SiC nanowires obtained possess [111] preferred growth direction with a high density stacking faults and twin defects. Taking into consideration the binary alloy diagram of Co Si and the participation of oxygen, we propose the vapor-solid growth mechanism of SiC nanowires and discuss the effect of the supersaturation of Si O on the morphology and yields of SiC nanowires.

关键词： Silicon carbide Nanowires Morphology

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Medication Reconciliation at the Admission of the Medical Emergency Unit of Teaching Pediatric hospital of Ouagadougou, Burkina Faso

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Pharmacology & Pharmacy 2025年第1期16卷 20-30页

作者： Moussa Ouédraogo Geoffroy w. Dibri Emile w. Ouédraogo Kampadilemba Ouoba Guembre Adama Charles B. Sombie Alice Ouédraogo hubert Yoni Aïssata Kabore Estelle N. h. Youl Unit de Formation et de Recherche Sciences de la Sant Universit Joseph KI-ZERBO Ouagadougou Burkina Faso Centre hospitalier Universitaire Charles de Gaulles Ouagadougou Burkina Faso

Introduction and Problem Statement: Many medication errors occur during the community and hospital transition. Indeed, the world health Organization launched the international “high 5S” project to implement medication reconciliation in healthcare facilities to reduce them and ensure patients a safe, high-quality healthcare pathway. Objective: This study aimed to detect medication errors by reconciling drug treatments and assess the relevance and feasibility of this standardized practice within the Medical Emergency Unit of the Teaching Pediatric hospital of Ouagadougou (Burkina Faso). Methods: Patients whose parents gave their consent at their entrance were enrolled. For each patient, the pharmacy team completed a reconciliation form that included the patient’s usual treatment, which was taken and in progress and received upon admission to the medical emergency unit. Patients’ treatments were reviewed to detect and characterize discrepancies. The data of each form were reported and analyzed using KoboCollect, an Android application. Results: 135 records and 412 medication lines were captured over six weeks. The average time of treatment reconciliation per patient was 57 minutes. One thousand one hundred ninety-eight (1198) intentional discrepancies were detected, of which 6.09% were documented. Seventy-one (71) unintentional discrepancies were collected, including 39 omissions, 24 regimen dosing errors, and 8 pharmaceutical form dosage errors. Forty-nine (49) unintentional discrepancies, or 69.01%, were corrected by formulated pharmaceutical interventions toward physicians. Conclusion: Medical treatment reconciliation during hospital admission is critical because discrepancies can compromise the efficacy and/or safety of the patient’s hospital medication.

关键词： Admission Medication Reconciliation Medication-Error Medical Emergency Unit Pediatric Burkina Faso

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Li掺杂对4h-SiC光电性质影响的理论研究

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原子与分子物理学报 2025年第2期42卷 151-158页

作者：李萍尹伟潘学聪庞国旺马亚斌杨亚宏杨菲宇张盼秦彦军新疆理工学院理学院阿克苏843100 新疆理工学院机电工程学院阿克苏843100

采用基于密度泛函理论的第一性原理方法,计算了Li掺杂4h-SiC体系的电子结构及光学性质.结果表明,掺杂前后的4h-SiC均为间接带隙半导体,Li原子间隙掺杂后形成n型半导体,Li原子替位式掺杂体系的禁带中出现了杂质能级,降低了电子跃迁时所... 详细信息

采用基于密度泛函理论的第一性原理方法,计算了Li掺杂4h-SiC体系的电子结构及光学性质.结果表明,掺杂前后的4h-SiC均为间接带隙半导体,Li原子间隙掺杂后形成n型半导体,Li原子替位式掺杂体系的禁带中出现了杂质能级,降低了电子跃迁时所需的能量;对电荷差分密度图的分析表明,Li原子失去电子,导致Li-C键和Li-Si键的共价性降低,以离子性为主;在可见光区域,相比于4h-SiC体系,掺杂体系的吸收率峰值均有所提高,其中Li间隙掺杂体系吸收带边最小,吸收率峰值最大,掺杂后的4h-SiC体系对红外、可见光、紫外均能够有所吸收,说明Li掺杂能够有效拓宽4h-SiC对光的响应范围.

关键词： Li掺杂 4h-SiC 电子结构光学性质第一性原理

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Ultra-low potential formaldehyde electrooxidation to formate and h_(2) on an Ag/Ag_(2)O heterostructure catalyst

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Nano Research 2025年第2期18卷 131-140页

作者： haitao Shi Rui Zhang Chongchong wang Xiaoping Kong Linlin pan Meijie wei wei wang weixin Lv Lei wang School of Chemistry and Chemical Engineering Yancheng Institute of TechnologyYancheng 224051China Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang UniversityHarbin 150080China

Formaldehyde oxidation reaction(FOR)is a promising reaction alternative to the anodic oxygen evolution reaction(OER)owing to its ultra-low electrolysis potential and ability to produce formate and hydrogen *** this work,the electrode for FOR is prepared using Ag/Ag_(2)O nanoparticles(Ag/Ag_(2)O NPs)covered with Nafion membrane as the catalysts modified onto nickel foam(NF).Ag/Ag_(2)O NPs@NF exhibits significantly higher FOR activity than Ag NPs@NF and Ag_(2)O NPs@*** 100 mA·cm^(-2),the FOR potential on the Ag/Ag_(2)O NPs@NF electrode is only 0.16 V(***).Meanwhile,the Faradaic efficiencies can reach up to 100% for both formate and h_(2) produced by *** functional theory(DFT)calculations indicate that the Ag/Ag_(2)O heterostructure exhibits lower reaction energy barriers for generating formate and h2 than pure Ag and Ag_(2)*** work introduces a new synthetic approach for developing novel FOR catalysts and offers insights into the potential application prospects of FOR.

关键词： formaldehyde oxidation ultra-low potential heterostructure 200%hydrogenation formate production

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Adaptive h_∞ Control for Nonlinear hamiltonian Systems with Time Delay and Parametric Uncertainties

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International Journal of Automation and computing 2014年第4期11卷 368-376页

作者： pan wang wei-wei Sun Institute of Automation Qufu Normal University School of Electrical Information and Automation Qufu Normal University

This paper addresses the adaptive h∞ control problem for a class of nonlinear hamiltonian systems with time delay and parametric uncertainties. The uncertainties under consideration are some small parameter perturbations involved in the structure of the hamiltonian system. Both delay-independent and delay-dependent criteria are established based on the dissipative structural properties of the hamiltonian systems and the Lyapunov-Krasovskii functional approach. In order to construct the adaptive h∞controller, the situation that the parameter perturbation is inexistent in the system is also studied and the controller is *** adaptive h∞ control problem is solved under some sufficient conditions which ensure the asymptotic stability and the L2 gain performance of the resulted closed-loop system. Numerical example is given to illustrate the applicability of the theoretical results.

关键词： Nonlinear hamiltonian systems time delay h∞ control uncertainties Lyapunov-Krasovskii function

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