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The detection,extraction and parameter estimation of extreme-mass-ratio inspirals with deep learning

Science China(physics,Mechanics & Astronomy) 2025年第1期68卷 82-92页

作者： Qianyun Yun Wen-Biao Han Yi-Yang Guo He Wang Minghui Du Hangzhou institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310124China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China School of physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Taiji Laboratory for Gravitational Wave Universe(Beijing/Hangzhou) University of Chinese Academy of SciencesBeijing 100049China Lanzhou Center for Theoretical physics Key Laboratory of Theoretical Physics of Gansu ProvinceKey Laboratory of Quantum Theory and Applications of MoELanzhou UniversityLanzhou 730000China institute of Theoretical {1.&Research Center of Gravitation Lanzhou UniversityLanzhou 730000China International Centre for Theoretical physics Asia-Pacific(ICTP-AP) University of Chinese Academy of Sciences(UCAS)Beijing 100049China Center for Gravitational Wave Experiment National Microgravity LaboratoryInstitute of MechanicsChinese Academy of SciencesBeijing 100190China

One of the primary goals of space-borne gravitational wave detectors is to detect and analyze extreme-mass-ratio inspirals(EM-RIs).This task is particularly challenging because EMRI signals are complex,lengthy,and *** this work,we introduce a 2-layer convolutional neural network(CNN)approach to detect EMRI signals for space-borne detectors,achieving a true positive rate(TPR)of 96.9%at a 1.false positive rate(FPR)for signal-to-noise ratio(SNR)from 50 to ***,the key intrinsic parameters of EMRIs such as the mass,spin of the supermassive black hole(SMBH)and the initial eccentricity of the orbit can also be inferred directly by employing a neural *** mass and spin of the SMBH can be determined at 99%and 92%*** will greatly reduce the parameter spaces and computing cost for the following Bayesian parameter *** model also has a low dependency on the accuracy of the waveform *** study underscores the potential of deep learning methods in EMRI data analysis,enabling the rapid detection of EMRI signals and efficient parameter estimation.

关键词： gravitational wave EMRIs deep-learing

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Morphology engineering of ZnO micro/nanostructures under mild conditions for optoelectronic application

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 498-503页

作者： Liang Chu Haoyu Shen Hudie Wei Hongyu Chen Guoqiang Ma Wensheng Yan institute of Carbon Neutrality and New Energy&School of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018China School of Applied physics and Materials Wuyi UniversityJiangmen 529020China

Zinc oxide(ZnO)serves as a crucial functional semiconductor with a wide direct bandgap of approximately 3.37 *** reaction is commonly used in the synthesis of ZnO micro/nanostructures,given its low cost,simplicity,and easy ***,ZnO morphology engineering has become desirable through the alteration of minor conditions in the reaction process,particularly at room *** this work,ZnO micro/nanostructures were synthesized in a solution by varying the amounts of the ammonia added at low temperatures(including room temperature).The formation of Zn^(2+)complexes by ammonia in the precursor regulated the reaction rate of the morphology engineering of ZnO,which resulted in various structures,such as nanoparticles,nanosheets,microflowers,and single ***,the obtained ZnO was used in the optoelectronic application of ultraviolet detectors.

关键词： morphology engineering low temperature ZnO nanosheets microflowers ultraviolet detector

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The electromagnetic form factors and spin polarization of Λc+ in the process ■

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Chinese physics C 2025年第02期 23-30页

作者：陈诚闫冰谢聚军 institute of Modern {1. Chinese Academy of Sciences School of Nuclear Sciences and Technology University of Chinese Academy of Sciences Southern Center for Nuclear-Science Theory (SCNT) Institute of Modern PhysicsChinese Academy of Sciences

The total cross sections of the process ■ close to the threshold are calculated within the vector meson dominance *** is found that the theoretical results can describe the current experimental *** nontrivial near-threshold energy dependence of the total cross sections of the process ■ can be well reproduced by considering the contributions from charmonium-like states and the Coulomb *** particular,the results for the angular distribution parameters about the differential cross section are consistent with the experiments from the BESⅢ *** addition,the relative phase ΔΦ of the electromagnetic form factors is given,and the spin polarization of Λc+is predicted at center-mass energy 4.7 *** is hopeful that this work will provide a new perspective on the characteristics of the charmed baryon Λc+.

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On the Multi-q Characteristics of Magnetic Ground States of Honeycomb Cobalt Oxides

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Chinese physics Letters 2025年第2期42卷 98-108页

作者： Yuchen Gu Xianghong Jin Yuan Li International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Beijing National Laboratory for Condensed Matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

The Kitaev honeycomb model has received significant attention due to its exactly solvable quantum spin liquid ground states and fractionalized *** cobalt oxides have been considered as a promising platform for realizing this ***,in contrast to the conventional wisdom regarding the single-q zigzag magnetic order inferred from previous studies of the candidate materials Na_(2)IrO_(3) and α-RuCl_(3),recent experiments on two representative honeycomb cobalt oxides,hexagonal Na_(2)Co_(2)TeO_(6) and monoclinic Na_(3)Co_(2)SbO_(6),have uncovered evidence for more complex multi-q zigzag order *** review surveys the experimental strategies used to distinguish between single-and multi-q orders,along with the crystallographic symmetries of cobalt oxides,in comparison with previously studied *** general formation mechanism of multi-q order is also briefly *** goal is to provide a solid ground for examining the relevance of multi-q order in honeycomb cobalt oxides and discuss its implications for the microscopic model of these intriguing quantum magnets.

关键词： cobalt oxides quantum

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Impact of nonextensivity on the transport coefficients of strongly interacting QCD matter

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Chinese physics C 2025年第02期 93-109页

作者： Dhananjay Singh Arvind Kumar Department of physics Dr.B R Ambedkar National Institute of Technology Jalandhar

Tsallis nonextensive statistics is applied to study the transport coefficients of strongly interacting matter within the Polyakov chiral SU（3） quark mean field model（PCQMF）.Nonextensivity is introduced within the PCQMF model through a dimensionless parameter q to examine the viscous properties,such as shear viscosity（η）and bulk viscosity（ζb）,and conductive properties,such as electrical conductivity(σel) and thermal conductivity（κ）.Additionally,some key thermodynamic quantities relevant to the transport coefficients,such as the speed of sound(csq2) and specific heat at constant volume(evq),are *** temperature dependence of the transport coefficients is explored through a kinetic theory approach with the relaxation time *** results are compared to those of the extensive case where q approaches *** nonextensive q parameter is found to have a significant effect on all transport *** find that the nonextensive behaviour of the medium enhances specific shear viscosity η/sq,as well as conductive coefficients σel/T and κ/*** contrast,the normalized bulk viscosity ζb/sqis found to decrease as the nonextensivity of the medium *** also studied the transport coefficients for finite values of chemical *** magnitudes of η,σel,and κ increase at lower temperatures,while ζbis found to decrease for systems with non-zero chemical potential.

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Efficient large-area flexible organic photovoltaic modules on transparent thin silver electrodes

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Science China Chemistry 2025年第3期 1199-1206页

作者： Cong Xie Zedong Xiong Xinlu Liu Wen Wang Yang Liu Xueshi Jiang Xin Lu Lulu Sun Yinhua Zhou Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Kunming institute of {1.

Large-area flexible organic photovoltaic（OPV） modules are challenging to achieve high power conversion efficiency（PCE）.Electrical shunts or shortages generally occur in large-area OPV modules due to the ultrathin（1.0–200 nm） and soft active *** the surface smoothness of bottom transparent electrode will be able to suppress the shunts and *** this work,we report a method to fabricate smooth and flexible transparent electrodes based on thin silver film,and further to fabricate efficient large-area flexible OPV *** fabricated thin silver transparent electrodes simultaneously have high conductivity,high optical transmittance,good mechanical flexibility and low surface *** exposure（h.e.）treatment on MoO3effectively facilitates the continuous growth of the thin transparent silver electrode.6 nm silver film on MoO3（h.e.） on plastic substrate shows a transmittance up to 89%,a sheet resistance of 1. Ω/sq,and a low surface roughness with a rootmean-square value of 0.276 ***,52-cm2flexible organic solar modules（1. subcells） showed a certified PCE of 1..66%.Furthermore,a 1.50 cm2flexible component assembled by 25 pieces of 52–55 cm2modules showed certified PCE of 1..1.% with an open-circuit voltage of 62.85 V.

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H?rmander oscillatory integral operators: A revisit

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Science China Mathematics 2025年第04期 873-890页

作者： Chuanwei Gao Zhong Gao Changxing Miao School of Mathematical Sciences Capital Normal University institute of Applied {1. and Computational Mathematics

In this paper, we present new proofs for both the sharp Lpestimate and the decoupling theorem for the H?rmander oscillatory integral operator. The sharp Lpestimate was previously obtained by Stein（1.86） and Bourgain and Guth（201.） via the TT*and multilinear methods, respectively. We provide a unified proof based on the bilinear method for both odd and even dimensions. The strategy is inspired by Barron's work（2022） on the restriction problem. The decoupling theorem for the H?rmander oscillatory integral operator can be obtained by the approach in Beltran et al.（2020）, where the key observation can be roughly formulated as follows: in a physical space of sufficiently small scale, the variable setting can be essentially viewed as *** contrast, we reprove the decoupling theorem for the H?rmander oscillatory integral operator through the Pramanik-Seeger approximation approach(Pramanik and Seeger（2007）). Both proofs rely on a scale-dependent induction argument, which can be used to deal with perturbation terms in the phase function.

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The GECAM ground search system for gamma-ray transients

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Science China(physics,Mechanics & Astronomy) 2025年第3期68卷 161-174页

作者： Ce Cai Yan-Qiu Zhang Shao-Lin Xiong Ping Wang Jian-Hui Li Xiao-Bo Li Cheng-Kui Li Yue Huang Shi-Jie Zheng Li-Ming Song Shuo Xiao Qi-Bin Yi Yi Zhao Sheng-Lun Xie Rui Qiao Yan-Qi Du Zhi-Wei Guo Wang-Chen Xue Chao Zheng Jia-Cong Liu Chen-Wei Wang Wen-Jun Tan Yue Wang Jin-Peng Zhang Chao-Yang Li Guo-Ying Zhao Xiao-Yun Zhao Xiao-Lu Zhang Zhen Zhang Wen-Xi Peng Xiang Ma Jing-Yan Shi Dong-Ya Guo Jin Wang Xin-Qiao Li Xiang-Yang Wen Zheng-Hua An Fan Zhang College of physics and Hebei Key Laboratory of Photophysics Research and Application Hebei Normal UniversityShijiazhuang050024China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China University of Chinese Academy of Sciences Beijing100049China School of physics and Electronic Science Guizhou Normal UniversityGuiyang550001China Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guizhou Normal UniversityGuiyang550001China School of physics and Optoelectronics Xiangtan UniversityXiangtan411105China School of Computer and Information Dezhou UniversityDezhou253023China institute of Astro{1. Central China Normal UniversityWuhan430079China

In the era of time-domain,multi-messenger astronomy,the detection of transient events on the high-energy electromagnetic sky has become more important than *** gravitational wave high-energy electromagnetic counterpart all-sky monitor(GECAM)is a dedicated mission to monitor gamma-ray transients,launched in December,2020.A real-time on-board trigger and location software,using the traditional signal-to-noise ratio(SNR)method for blind search,is constrained to relatively bright signals due to the limitations in on-board computing resources and the need for real-time *** this work,we developed a ground-based pipeline for GECAM to search for various transients,especially for weak bursts missed by on-board *** pipeline includes both automatic and manual mode,offering options for blind search and targeted *** targeted search is specifically designed to search for interesting weak bursts,such as gravitational wave-associated gamma-ray bursts(GRBs).From the ground search of the data in the first year,GECAM has been triggered by 54 GRBs and other transients,including soft gamma-ray repeaters,X-ray binaries,solar flares,terrestrial gamma-ray *** report the properties of each type of triggers,such as trigger time and light *** this search pipeline and assuming a soft Band spectrum,the GRB detection sensitivity of GECAM is increased to about 1.1.1.^(-8)erg cm^(-2)s^(-1.(1.-1.00 ke V,burst duration of 20 s).These results demonstrate that the GECAM ground search system(both blind search and targeted search)is a versatile pipeline to recover true astrophysical signals which were too weak to be found in the on-board search.

关键词： gamma-ray sources gravitational waves data analysis gamma-ray telescopes

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Constructing 2D bismuth-based heterostructure for highly efficient photocatalytic CO2 reduction

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Tungsten 2025年第1期7卷 71-79页

作者： Ruo-Hang Xu Hao-Yu Jiang Dan-Dan Cui Kun-Rong Du Hong-Run Zhang Sheng-Jie Xu Ya-Qi Li Zhi-Zhen Ren Liang Wang Wei-Chang Hao Yi Du School of physics and BUAA-UOW Joint Research Centre Beihang University Shenzhen institute of Beihang University Centre for Catalysis and Clean Energy School of Environment and Science Griffith University

Reforming carbon dioxide（CO2） into fuels and valuable chemicals using solar energy holds significant potential for emission reduction and addressing energy supply *** recombination of photocarriers remains a major obstacle,however,to enhancing solar energy conversion efficiency in the photocatalytic reaction *** two-dimensional materials,constructing heterogeneous structures has emerged as an effective strategy to enhance the separation of photoexcited carriers by leveraging the internal electric field at the heterogeneous ***,we present a facile strategy for preparing Bi4NbO8Br/Bi2WO6plate-on-plate Z-scheme junctions with a strong internal electric field by in situ *** unique heterostructure facilitates efficient separation and transport of photoexcited charges by harnessing the internal electric field induced by chemical bonding at the lateral ***,the Bi4NbO8Br/Bi2WO6heterostructure exhibits enhanced CO2photoreduction properties,along with a CO yield rate of approximately 35 μmol·g-1.h-1.nder full light *** work offers novel insights into the synthesis of unique hetero structures intended to enhance the efficiency of photocatalytic CO2reduction.

关键词： Bi4NbO8Br/Bi2WO6 CO2 reduction Heterostructures Photocatalysts

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Combustion aerosols and suspended dust with controlled processes in Lhasa:Elemental analysis and size distribution characteristics

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Journal of Environmental Sciences 2025年第2期148卷 591-601页

作者： Jinglin Li Zhuoga Deqing Jie Liang Tao Guo Jian Yao Wei Liu Shanghai institute of Applied {1. Chinese Academy of ScienceShanghai 201800China University of Chinese Academy of Science Beijing 100049China Meteorological Bureau of Tibet Autonomous Region Lhasa 850000China

To explore air contamination resulting from special biomass combustion and suspended dust in Lhasa,the present study focused on the size distribution and chemical characteristics of particulate matter(PM)emission resulting from 7 types of non-fossil pollution *** investigated the concentration and size distribution of trace elements from 7 pollution sources collected in *** Lhasa’s atmospheric particulate matter data,enrichment factors(EFs)have been calculated to examine the potential impact of those pollution sources on the atmosphere quality of *** highest mass concentration of total elements of biomass combustion appeared at PM_(0.4),and the second highest concentration existed in the size fraction 0.4-1.m;the higher proportion(1.%)of toxicmetals was produced by biomass *** elemental composition of suspended dust and atmospheric particulate matter was close(except for As and Cd);the highest concentration of elements was all noted in PM_(2.5-1.)(PM3-1.).Potassium was found to be one of the main biomass *** proportion of Cu in suspended dust is significantly lower than that of atmospheric particulate matter(0.53%and 3.75%),which indicates that there are other anthropogenic *** EFs analysis showed that the Cr,Cu,Zn,and Pb produced by biomass combustion were highly enriched(EFs>1.0)in all particle *** EFs of most trace elements increased with decreasing particle size,indicating the greater influence of humanfactors on smaller particles.

关键词： Size distribution Trace elements Particulate matter Enrichment factors Lhasa

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