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Unexpected non-monotonic changing in the heterogeneity of glasses during annealing

Journal of Materials Science & technology 2024年第10期177卷 96-102页

作者： Yu Tong Fucheng Li Lijian Song Yanhui Liu Juntao Huo Jichao Qiao Yao Yao JMPelletier Daniel Crespo Eloi Pineda Jun-Qiang Wang CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 710072China Mateis UMR CNRS5510INSA-LyonUniversitéde LyonVilleurbanne cedex F-69621France Department of Physics Institute of Energy TechnologiesUniversitat Politècnica de CatalunyaBarcelona 08019Spain

The heterogeneity of glasses has critical influences on the *** heterogeneity evolves during annealing is an intriguing cutting-edge *** this work,the heterogeneity of the annealed metal-lic and polymer glasses has been studied systematically by using stress relaxation and nanoindentation *** stress relaxation processes are analyzed using Kohlrausch-Williams-Watts(KWW)*** surprisingly find that the heterogeneous factor βkww in KWW equation does not change monotonously but increases first and then decreases along with the annealing *** two-stage process implies that glasses do not evolve as expected toward the more homogeneous glassy state but become homogeneous first and then more *** is further verified by the evolution of critical shear stress for local *** is revealed that the two-stage process is correlated with different relaxation modes,which is further interpreted using a phenomenological *** findings not only give insights into understanding the nature of glasses,but also are useful for designing glasses with superior properties.

关键词： Glasses Heterogeneity Aging Relaxation

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Improved performance of Insight-HXMT/HE CsI detectors

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Science china(physics,Mechanics & Astronomy) 2025年第7期Mechanics & Astronomy) .卷 108-120页

作者： Chao Zheng Shao-Lin Xiong Cheng-Kui Li Xiao-Bo Li Xu-Fang Li Gang Li Peng Zhang Wang-Chen Xue Yan-Qiu Zhang Cong-Zhan Liu Juan Zhang Bing Li Ming-Yu Ge Li-Ming Song Wen-Jun Tan Chen-Wei Wang Yue Wang Jin-Peng Wang Jia-Cong Liu Sheng-Lun Xie Ce Cai Shuo Xiao Wen-Long Zhang Hao-Xuan Guo Yu-Peng Xu Shu Zhang Shuang-Nan Zhang Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences College of Electronic and Information Engineering Tongji University Institute of Astrophysics Central China Normal University College of Physics and Hebei Key Laboratory of Photophysics Research and Application Hebei Normal University Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guizhou Normal University School of Physics and Electronic Science Guizhou Normal University School of Physics and Physical Engineering Qufu Normal University Department of Nuclear Science and Technology School of Energy and Power EngineeringXi'an Jiaotong University

As one of three primary scientific payloads of Insight-Hard X-ray Modulation Telescope（Insight-HXMT）,the High Energy Xray telescope（HE） consists of 18 Nal/CsI phoswich detectors,and the CsI detectors can detect gamma-rays that penetrate the satellite from all directions,with an energy range of about 60 keV to 3.2 MeV and a total geometric area of about 5100 *** characteristics make the CsI detectors suitable for monitoring GRBs and other high-energy *** calibration and performance studies of the CsI detectors' instrumental response were conducted during the early operation phase *** this work,we refine the cross-calibration of CsI detectors using a large sample of 85 bright *** analysis reveals that the effective area is inversely proportional to the incident angle（θ）,with no correlation observed with the azimuthal angle（θ）.We subsequently incorporated this relationship into the calibration database to correct for systematic biases in the initial ***,we demonstrate that joint spectral analyses incorporating CsI data provide better constraints on highenergy spectral parameters for most ***,we evaluate,for the first time,the energy response of CsI detectors for pointing observation by measuring the Crab Nebula using the Earth occultation *** effort extends the energy range of the Insight-HXMT telescope from 1-250 to 1-750 keV for pointing *** results show that the spectra measured by CsI detectors are consistent with other well-calibrated instruments,validating the reliability and accuracy of the CsI detectors' *** work will contribute to Insight-HXMT's capacity to generate more scientific outputs in the field of time-domain astronomy.

关键词： Crab Nebula cross-calibration CsI detectors gamma-ray bursts Insight-HXMT

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Machine learning in nuclear physics at low and intermediate energies

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Science china(physics,Mechanics & Astronomy) 2023年第8期66卷 1-19页

作者： Wanbing He Qingfeng Li Yugang Ma Zhongming Niu Junchen Pei Yingxun Zhang Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai 200438China School of Science Huzhou UniversityHuzhou 313000China Institute of Modern Physics Chinese Academy of SciencesLanzhou 73000China School of Physics and Optoelectronic Engineering Anhui UniversityHefei 230601China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China Department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413China Guangxi Key Laboratory of Nuclear Physics and Technology Guangxi Normal UniversityGuilin 541004China

Machine learning(ML)is becoming a new paradigm for scientific research in various research fields due to its exciting and powerful capability of modeling tools used for big-data processing *** this review,we first briefly introduce the different methodologies used in ML algorithms and *** a snapshot of many applications by ML,some selected applications are presented,especially for low-and intermediate-energy nuclear physics,which include topics on theoretical applications in nuclear structure,nuclear reactions,properties of nuclear matter,and experimental applications in event identification/reconstruction,complex system control,and firmware ***,we present a summary and outlook on the possible directions of ML use in low-intermediate energy nuclear physics and possible improvements in ML algorithms.

关键词： machine learning nuclear physics low and intermediate energies

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Design of a LYSO crystal electromagnetic calorimeter for dark photon detection in the DarkSHINE experiment

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Nuclear Science and Techniques 2025年第3期36卷 69-84页

作者： Zhi-Yu Zhao Qi-Bin Liu Ji-Yuan Chen Jing Chen Jun-Feng Chen Xiang Chen Chang-Bo Fu Jun Guo Kim Siang Khaw Liang Li Shu Li Dan-Ning Liu Kun Liu Si-Yuan Song Tong Sun Jian-Nan Tang Yu-Feng Wang Zhen Wang Wei-Hao Wu Hai-Jun Yang Yu-Ming Lin Rui Yuan Yu-Lei Zhang Yun-Long Zhang Bai-Hong Zhou Xu-Liang Zhu Yi-Fan Zhu Tsung-Dao Lee Institute Shanghai Jiao Tong University1 Lisuo RoadShanghai 201210China Institute of Nuclear and Particle Physics School of Physics and Astronomy800 Dongchuan RoadShanghai 200240China Key Laboratory for Particle Astrophysics and Cosmology(MOE) Shanghai Key Laboratory for Particle Physics and Cosmology(SKLPPC)Shanghai Jiao Tong University800 Dongchuan RoadShanghai 200240China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 201899China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200443China Institute of Modern Physics Fudan UniversityShanghai 200443China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China

This paper presents the design and optimization of a lutetium yttrium oxyorthosilicate(LYSO)crystal electromagnetic calorimeter(ECAL)for the DarkSHINE experiment,which aims to identify dark photons as potential mediators of dark *** ECAL design was evaluated through comprehensive simulations,focusing on optimizing dimensions,material selection,energy distribution,and energy *** configuration consisted of 21×21×11 LYSO crystals,each measuring 2.5 cm×2.5 cm×4 cm,arranged in a staggered layout to enhance signal detection efficiency.A 4 GeV energy dynamic range was established to ensure accurate energy measurements without saturation,which is essential for background rejection and signal identification.A detailed digitization model was developed to simulate scintillation,silicon photomultiplier,and analog-to-digital converter behaviors,providing a realistic representation of the detector's ***,the study assessed radiation damage in the ECAL region,emphasizing the importance of using radiation-resistant scintillators and silicon sensors.

关键词： Electromagnetic calorimeter LYSO Scintillator detector Light dark matter Dark photon

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Low-Complexity Channel Estimation for RIS-Assisted ISAC System

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china Communications 2025年第4期22卷 296-308页

作者： Chen Zhen Li Jianqing Zhang Haijun Zhang Wei The Institute of Microelectronics University of MacaoMacao 999078China School of Computer Science and Engineering Macao University of Science and TechnologyMacao 999078China Beijing Engineering and Technology Research Center for Convergence Networks and Ubiquitous Services University of Science and Technology BeijingBeijing 100083China Henan Academy of Science Applied Physics Institute Co. LtdZhengzhou 450008China

Integrated sensing and communication(ISAC),assisted by reconfigurable intelligent surface(RIS)has emerged as a breakthrough technology to improve the capacity and reliability of 6G wireless ***,a significant challenge in RIS-ISAC systems is the acquisition of channel state information(CSI),largely due to co-channel interference,which hinders meeting the required reliability *** address this issue,a minimax-concave penalty(MCP)-based CSI refinement scheme is *** approach utilizes an element-grouping strategy to jointly estimate the ISAC channel and the RIS phase shift *** previous methods,our scheme exploits the inherent sparsity in RIS-assisted ISAC channels to reduce training overhead,and the near-optimal solution is derived for our studied RIS-ISAC *** effectiveness of the element-grouping strategy is validated through simulation experiments,demonstrating superior channel estimation results when compared to existing benchmarks.

关键词： channel estimation element grouping integrated sensing and communication(ISAC) RIS

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Effects of laser conditioning with different pulse widths on picosecond laser-induced damage resistance in HfO2/SiO2 high-reflectivity coatings

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Optical Materials Express 2025年第7期15卷 1467-1482页

作者： Zhou, Yan Shuai, Kun Tao, Chunxian Li, Dawei Xu, Guang Li, Dawei Zhang, Weili Liu, Yuru Lian, Yafei Liu, Xiaofeng Zhao, Yuanan Dai, Yaping Shao, Jianda School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai200093 China Laboratory of Thin Film Optics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Department of Advanced Optical and Microelectronic Equipment Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China National Laboratory on High Power Laser and Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Shanghai Institute of Laser Plasma China Academy of Engineering Physics Shanghai201800 China Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou310024 China

Current optimizations in the fabrication processes of multilayer dielectric (MLD) high-reflectivity (HR) coatings struggle to meet the demand for picosecond (ps) laser damage resistance in high-energy petawatt laser systems. This study investigates laser conditioning (LC) effects of 250 ps, 500 ps, 800 ps, and 10 nanosecond (ns) laser pulses on the ps laser-induced damage resistance of electron beam (e-beam) HfO2/SiO2 HR coatings. Results demonstrate a 12% enhancement in the laser-induced damage threshold (LIDT) under ∼10 ps laser irradiation for 500 ps conditioned samples compared to unconditioned ones, while negligible LIDT variations are observed for other pulse widths. The defect density and damage types in unconditioned and conditioned samples exhibit no statistical alteration. This indicates that LC does not eliminate nanoscale defects but only increases their LIDTs for 500 ps conditioned samples. To reveal the improvement mechanism of 500 ps LC on the ps laser-induced damage resistance, a simulated model of the interaction between sub-ns laser pulses and localized defect states is proposed, combining ionization rate equations with the two-temperature model (TTM). For 500 ps LC, although the initial electron number density of the defect energy level is increased, the defect energy level gap is also widened due to the appropriate lattice temperature. The effect of this widening gap surpasses that of the aforementioned increased initial electron density, making electron ionization more difficult under ∼10 ps laser irradiation. This work provides new strategies and approaches for enhancing the ps laser-induced damage resistance of MLD HR coatings. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Laser damage

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Observation of low thermal expansion behavior and weak thermal anisotropy in M_(3)A_(2)C phases

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Journal of Materials Science & technology 2023年第23期154卷 210-216页

作者： Hongxiang Chen Zhilong Zhang Jun Deng Zhijie Lin Chunfu Hong Shixuan Du Pinqiang Dai School of Materials Science and Engineering Fujian University of Technology Fuzhou 350118 China Institute of Physics & University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100190 China Fujian Provincial Key Laboratory of Advanced Materials Processing and Application Fuzhou 350118 China Center for Advanced Energy and Functional Materials Fujian University of Technology Fuzhou 350118 China Songshan Lake Materials Laboratory Dongguan 523808 China CAS Key Laboratory of Vacuum Physics Beijing 100049 China

M_(3)A_(2)X phases,named 321 phases,are an atypical series of MAX phases featuring in the MA-triangular-prism bilayers,with the A=As/P,exhibiting excellent elastic *** work systematically studies the thermal expansion properties of 321 *** found their average linear thermal expansion coefficients(TECs),α_(L)=5-6μK^(–1),are the lowest among the reported values of MAX *** lowest average TEC was found in Nb_(3)As_(2)C(αa=4.46(4)μK^(–1),αc=5.09(4)μK–1,αL=5.09(4)μK–1).The average TEC and anisotropy factor(αc/αa)of Nb_(3)As_(2)C and Nb_(3)P_(2)C were lower than the ones of the corresponding 211 *** best isotropy performance was found in Nb_(3)P_(2)C (αc/αa=1.11).Moreover,our first-principles calculations demonstrate that the weaker chemical bonding between Nb-As/P than Nb-C induces thermal expansion in M_(3)A_(2)X ***,a relatively weaker anharmonic effect in 321 phases than in the 211 phases was revealed by the as-calculated average Grüneisen parameters,which account for the lower TECs in 321 *** low TECs and enhanced thermal isotropy make 321 phases outstanding among MAX phases,which could be sound candidates for varying-temperature structural-functional components.

关键词： Max phase Layered ceramics Thermal expansion Anisotropy X-ray diffraction

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Electronic structure of cuprate-nickelate infinite-layer heterostructure

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Chinese physics B 2023年第8期32卷 391-396页

作者：陈大川 Paul Worm 司良张春小邓凤麟蒋沛恒钟志诚 CAS Key Laboratory of Magnetic Materials and Devices&Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China Institut für Festkörperphysik TU WienVienna 1040Austria School of Physics Northwest UniversityXi'an 710127China School of Physics and Optoelectronic Engineering Shandong University of TechnologyShandong 250049China

The discovery of superconductivity in Sr/Ca-doped infinite-layer nickelates Nd(La)NiO_(2)thin films inspired extensive experimental and theoretical ***,research on the possibilities of enhanced critical temperature by interface heterostructure is still *** to the similarities of the crystal structure and band structure of infinite-layer nickelate La NiO_(2)and cuprate CaCuO_(2),we investigate the crystal,electronic and magnetic properties of La NiO_(2):CaCuO_(2)heterostructure using density functional theory and dynamical mean-field *** theoretical results demonstrate that,even a very weak inter-layer z-direction bond is formed,an intrinsic charge transfer between Cu-3d_(x^(2)-y^(2))and Ni-3d_((x^(2)-y^(2)))orbitals is *** weak interlayer hopping between Cu and Ni leaves a parallel band contributed by Ni/Cu-3d_((x^(2)-y^(2)))orbitals near the Fermi *** an infinite-layer heterostructure with negligible interlayer interaction and robust charge transfer opens a new way for interface engineering and nickelate superconductors.

关键词： nickelate superconductor infinite-layer oxide perovskite heterostructure

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Grey Markov model based horizontal scaling strategy for Kubernetes

Grey Markov model based horizontal scaling strategy for Kube...

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IEEE Advanced Information Management,Communicates,Electronic and Automation Control Conference (IMCEC)

作者： Pengxiang Gao Han Wang Ziyang Meng Yakun Zhang Institute of Computer Application China Academy of Engineering Physics Mianyang China

ISBN: (数字)9798350316537

ISBN: (纸本)9798350316544

With the rapid development and wide application of cloud computing technology, Kubernetes has attracted much attention as the most mainstream container cluster management tool. Aiming at the shortcomings of the horizontal auto-scaling strategy of Kubernetes itself, this paper proposes a horizontal auto-scaling optimization strategy based on the grey Markov model, which can effectively achieve fast scaling up to meet the sudden task requests and slow scaling down to reduce the SLA violation rate. Finally, the effectiveness of the algorithm is verified through experiments.

关键词： computers Cloud computing Computational modeling Predictive models Containers Prediction algorithms Information management

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An Improved Verification Method Based on Asynchronous Verification

An Improved Verification Method Based on Asynchronous Verifi...

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Artificial Intelligence and Intelligent Manufacturing (AIIM), International Symposium on

作者： Yiqi Wang Yulong Wang Junyan Ye Yubing Duan Ke Ye Mingyong Yin Institute of Computer Application China Academy of Engineering Physics Mianyang China

ISBN: (数字)9798331541729

ISBN: (纸本)9798331541736

With the rapid development of Industrial Internet of Things (IIoT) technology, its applications have permeated various aspects of life and multiple industry sectors, significantly enhancing convenience. However, the large-scale deployment of HoT devices has also triggered numerous security issues, especially in enterprise-level applications. Although some current methods have alleviated these problems to a certain extent, they still face many challenges in practical applications. This paper proposes an improved solution based on asynchronous verification methods, integrating Risk Assessment Based on Security Baseline, Business Security Mechanisms, and Global Access Control List into the algorithms of the Verification Server. The aim of this method is to enhance internal traffic security by rejecting access from high-risk hosts, ensuring minimal API access authorization, and enforcing security policies, thereby avoiding the rapid depletion of resources at the Verification Server due to excessive malicious failed requests.

关键词： Authorization Data security Authentication Clustering algorithms Regulation Security Servers Risk management Business Industrial Internet of Things

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