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Tetrahedron constellation of gravitational wave observatory

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Science China(physics,Mechanics & Astronomy) 2025年第2期68卷 86-93页

作者： Hong-Bo Jin Cong-Feng Qiao National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China International centre for theoretical physics Asia-Pacific University of Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

For the first time,we have introduced the tetrahedron constellation of gravitational wave observatory(TEGO)composed of four identical spacecrafts(S/Cs).The laser telescopes and their pointing structures are mounted on the S/C platform and are evenly distributed at three locations 120 degrees *** structures form automatically a stable mass center for the *** time delay interferometry(TDI)is used to suppress the frequency noise of gravitational wave(GW)*** unequal-arm Michelson TDI configuration and the Sagnac TDI configuration are equally effective at eliminating the laser frequency noise based on the TEGO ***,compared with the configurations of LISA,Taiji,and Tian Qin,the TEGO has more combinations of optical paths in its TDI system sensitive to GW *** six arms of TEGO are simultaneously sensitive to the six polarization modes of *** sensitivity implies that GW modes beyond the predictions of general relativity(GR)can be detected *** instance,a scalar longitudinal mode of GWs,which is not predicted by GR,has been identified as a dominant polarization *** mode is found to be evident in the response amplitudes of the TEGO arms,such as between S/C1 and S/C4,and S/C3 and S/C4,at certain orbital positions.

关键词： gravitational wave detectors and experiments gravitational waves experimental tests of gravitational theories experimental studies of gravity

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

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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 physics&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

Newtonian Limit in Generalized Brans-Dicke Theory

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Chinese physics Letters 1993年第9期10卷 513-515页

作者： ZHANG Yuan Zhong internatiojial centre for theoretical physics TriesteItaly and Institute of Theoretical PhysicsAcademia SinicaBeijing 100080

Newtonian limit in the generalised Jorclan-Brans-Dicke theory is discussed,and some ambiguities are clarified.

关键词： Brans Dicke Newtonian

Anisotropic quark stars f（R,Lm,T） in gravity

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Chinese physics C 2025年第02期 270-281页

作者： Takol Tangphati ?zzet Sakall Ayan Banerjee Anirudh Pradhan School of Science Walailak University Research Center for theoretical Simulation and Applied Research in Bioscience and Sensing Walailak University physics Department Eastern Mediterranean University Atrophysics Research centre School of MathematicsStatistics and Computer ScienceUniversity of Kwa Zulu–Natal centre for Cosmology Astrophysics and Space ScienceGLA University

We investigated the impact of f（R,Lm,T） gravity on the internal structure of compact stars,expecting this theory to manifest prominently in the high-density cores of such *** considered the algebraic function f（R,Lm,T）=R+αTLm,where a represents the matter-geometry coupling *** specifically chose the matter Lagrangian density Lm=-ρ to explore compact stars with anisotropic *** this end,we employed the MIT bag model as an equation of ***,we numerically solved the hydrostatic equilibrium equations to obtain mass-radius relations for quark stars（QSs）,examining static stability criteria,adiabatic index,and speed of ***,we used recent astrophysical data to constrain the coupling parameter a,which may lead to either larger or smaller masses for QSs,compared to their counterparts in general relativity.

关键词：

First Search for Pulsed CH Maser Emission Stimulated by a Pulsar

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Research in Astronomy and Astrophysics 2025年第2期25卷 62-71页

作者： Mengting Liu Di Li J.R.Dawson Joel M.Weisberg George Hobbs Ningyu Tang Gan Luo Duo Xu Donghui Quan Research Center for Astronomical Computing Zhejiang Laboratory Department of Astronomy Tsinghua University National Astronomical Observatories Chinese Academy of Sciences CSIRO Astronomy & Space Science Australia Telescope National Facility School of Mathematical and Physical Sciences and Astrophysics and Space Technologies Research centre Macquarie University Department of physics and Astronomy Carleton College Department of physics Anhui Normal University Institut de Radioastronomie Millimetrique 300 Rue de la Piscine Canadian Institute for theoretical Astrophysics University of Toronto 60 St.George Street

We present the first search for pulsed CH maser emission potentially stimulated by PSR J1644-4559,conducted using the ultra-wide-bandwidth low-frequency receiver on Murriyang,CSIRO's Parkes Radio *** targeted three CHΛ-doublet transitions at 3264,3335,and 3349 MHz,with a variability timescale of78 *** detected ten CH emission features at 3335 and 3349 MHz,and seven features at 3264 MHz,during both pulsar-ON and pulsar-OFF *** observed velocities align with the OH emission and absorption reported by a previous study,suggesting a close spatial association between CH and OH *** derived column densities for CH clouds within the Parkes beam range from 0.05 to 9.8×1013cm-2,indicating that these clouds are likely in diffuse and translucent *** limits for CH column densities within the pulsar beam ranged from 0.3 to 9.8×*** of these column densities suggests that CH clouds may exhibit clumpiness and *** significant stimulated emission feature was detected in the optical depth ***,as part of our search for pulsed stimulated emission,we investigated the potential CH absorption of the pulsar signal and found none,in agreement with astrophysical *** upper limits for the potential maser amplification factors towards PSR J1644-4559 at 3264,3335,and 3349 MHz are 1.014,1.009,and 1.009,*** study demonstrates the feasibility of detecting pulsed CH maser emission in the interstellar medium stimulated by pulsar photons.

关键词： (stars:) pulsars: general ISM: molecules masers

Predictions of H-mode access and edge pedestal instability in the EHL-2 spherical torus

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Plasma Science and Technology 2025年第02期 59-68页

作者：王嵎民李凯黄卓刘一良戴舒宇张洁黄艳清顾翔赵毅航徐帅王二辉郭栋石跃江谢华生梁云峰刘敏胜 the EHL-2 Team Hebei Key Laboratory of Compact Fusion ENN Science and Technology Development Co. Ltd. centre for theoretical and Computational physics College of Physics Qingdao University College of Computer Science South-Central Minzu University Key Laboratory of Materials Modification by Laser Ion and Electron Beams (Ministry of Education)School of Physics Dalian University of Technology Department of Plasma physics and Fusion Engineering University of Science and Technology of China College of physics and Electronic Engineering Hengyang Normal University Forschungszentrum Jülich GmbH Institute of Fusion Energy and Nuclear Waste Management-Plasmaphysik

The EHL-2 spherical torus is designed to demonstrate proton-boron(p-11B) fusion within a compact spherical *** planned heating system includes a negative ion-based neutral beam injection（N-NBI）,two positive ion-based NBI systems（P-NBI）,electron cyclotron resonance heating（ECRH）,ion cyclotron resonance heating（ICRH）,and high harmonic fast wave（HHFW）,with a total power output of 31 *** to scaling law estimates,the device is capable of achieving H-mode *** plasma density,ne,min,at the minimum LH power threshold,PLH,is estimated to be 4.4× *** pedestal parameters were calculated using the REPED *** B as the primary impurity ion,the predicted pedestal width and height are lower compared to the typical case with carbon *** pedestal collisionality for EHL-2 is estimated to range between 0.06 and 0.17,indicating the potential for significant energy loss due to edge localized modes（ELMs）.The heat flux on the divertor plate has been calculated using the JOREK *** peak heat fluxes during ELM bursts are approximately 31.0 MW/m2at the lower inboard target and 39.5 MW/m2at the lower outboard target.A preliminary design of the resonant magnetic perturbation（RMP） coils has been completed to both control type-Ⅰ ELMs and correct error *** system comprises 16coils arranged into 2×4 *** ELM control mode,a 14/2 component is generated at 1.7 G/kAt,with a current of 4.9 kA required to achieve σChirikov=1 at the resonant surface,where the normalized poloidal magnetic flux is *** error field（EF） modulation mode,2/1 and 3/1components are generated at 3.5 G/kAt and 2.8 G/kAt,respectively.

关键词：

Overview of the physics design of the EHL-2 spherical torus

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Plasma Science and Technology 2025年第02期 9-28页

作者：梁云峰谢华生石跃江顾翔姜欣辰董力立王雪韵杨丹可刘文军孙恬恬王嵎民李直蔡剑青宋显明谭沐芝杨光赵寒月董家齐彭元凯宋绍栋陈正元李颖颖刘兵罗迪杨圆明刘敏胜 Jianqing CAI Zhengyuan CHEN Jiaqi DONG Lili DONG Kaiming FENG Xingxin GE Xiang GU Dong GUO Lei HAN Hairong HUANG Kunwei HUANG Xianli HUANG Xinchen JIANG Dongxu LI Hongyue LI Pengmin LI Songjian LI Yingying LI Zhi LI Yunfeng LIANG Bing LIU Minsheng LIU Shuo LIU Wenjun LIU Yong LIU Xiuchun LUN Di LUO Wenwu LUO Yueng-Kay Martin PENG Ji QI Yuejiang SHI Shaodong SONG Xianming SONG Tiantian SUN Muzhi TAN Renyi TAO Hanqing WANG Xueyun WANG Yu WANG Yumin WANG Xiao XIAO Huasheng XIE Qifeng XIE Danke YANG Enwu YANG Guang YANG Xu YANG Yuanming YANG Baoshan YUAN Hong ZANG Wenwei ZHANG Hanyue ZHAO Xin ZHAO Yihang ZHAO Peihai ZHOU Hongfeng ZHU Xiaojun ZHU Debu BANERJEE Zhongyong CHEN Shuyu DAI Di HU Jiankun HUA Yanqing HUANG Zhuo HUANG Kai LI Li LI Chengyue LIU Tong LIU Yiliang LIU Zhifang LIN Haojie MA Zhiwei MA Erhui WANG Feng WANG Fuqiong WANG Zhengxiong WANG Shuai XU Qingwei YANG Jie ZHANG Pingwei ZHENG Wei ZHENG Hebei Key Laboratory of Compact Fusion Forschungszentrum Jülich GmbH Institute of Fusion Energy and Nuclear Waste Management-Plasmaphysik ENN Science and Technology Development Co. Ltd. Southwestern Institute of physics DISAT Polytechnic University of Turin Huazhong University of Science and Technology Key Laboratory of Materials Modification by Laser Ion and Electron Beams (Ministry of Education) School of physics Dalian University of Technology Beihang University Hengyang Normal University College of Computer Science South-Central Minzu University centre for theoretical and Computational physics College of physics Qingdao University College of physics Donghua University School of physics Hefei University of Technology School of Electrical Engineering& Automation Jiangsu Normal University School of Liberal Arts and Sciences North China Institute of Aerospace Engineering Zhejiang University Department of Plasma physics and Fusion Engineering University of Science and Technology of China University of South China

ENN is planning the next generation experimental device EHL-2 with the goal to verify the thermal reaction rates of p-11B fusion,establish spherical torus/tokamak experimental scaling laws at 10's keV ion temperature,and provide a design basis for subsequent experiments to test and realize the p-11B fusion burning *** on 0-dimensional（0-D） system design and 1.5-dimensional transport modelling analyses,the main target parameters of EHL-2 have been basically determined,including the plasma major radius,R0,of 1.05 m,the aspect ratio,A,of 1.85,the maximum central toroidal magnetic field strength,B0,of 3 T,and the plasma toroidal current,Ip,of 3 *** main heating system will be the neutral beam injection at a total power of 17 *** addition,6 MW of electron cyclotron resonance heating will serve as the main means of local current drive and MHD instabilities *** physics design of EHL-2 is focused on addressing three main operating scenarios,i.e.,（1） high ion temperature scenario,（2） high-performance steady-state scenario and（3） high triple product *** scenario will integrate solutions to different important issues,including equilibrium configuration,heating and current drive,confinement and transport,MHD instability,p-11B fusion reaction,plasma-wall interactions,*** that,there are several unique and significant challenges to address,including● establish a plasma with extremely high core ion temperature(Ti,0> 30 keV),and ensure a large ion-to-electron temperature ratio(Ti,0/Te,0> 2),and a boron concentration of 10%-15% at the plasma core;● realize the start-up by non-inductive current drive and the rise of MA-level plasma toroidal *** is because the volt-seconds that the central solenoid of the ST can provide are very limited;● achieve divertor heat and particle fluxes control including complete detachment under high P/R（> 20 MW/m） at relatively low electron *** overview will introduce the advanced progress in the ph

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Prussian Blue Analogue‑Templated Nanocomposites for Alkali‑Ion Batteries:Progress and Perspective

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Nano-Micro Letters 2025年第1期17卷 216-261页

作者： Jian‑En Zhou Yilin Li Xiaoming Lin Jiaye Ye Key Laboratory of theoretical Chemistry of Environment Ministry of EducationSchool of ChemistrySouth China Normal UniversityGuangzhou 510006People’s Republic of China School of Chemistry and physics Faculty of ScienceQueensland University of Technology2 George StreetBrisbaneQLD 4000Australia centre for Materials Science Queensland University of Technology2 George StreetBrisbaneQLD 4000Australia

Lithium-ion batteries(LIBs)have dominated the portable electronic and electrochemical energy markets since their commercialisation,whose high cost and lithium scarcity have prompted the development of other alkali-ion batteries(AIBs)including sodium-ion batteries(SIBs)and potassium-ion batteries(PIBs).Owing to larger ion sizes of Na^(+)and K^(+)compared with Li^(+),nanocomposites with excellent crystallinity orientation and well-developed porosity show unprecedented potential for advanced lithium/sodium/potassium *** enticing open rigid framework structures,Prussian blue analogues(PBAs)remain promising self-sacrificial templates for the preparation of various nanocomposites,whose appeal originates from the well-retained porous structures and exceptional electrochemical activities after thermal *** review focuses on the recent progress of PBA-derived nanocomposites from their fabrication,lithium/sodium/potassium storage mechanism,and applications in AIBs(LIBs,SIBs,and PIBs).To distinguish various PBA derivatives,the working mechanism and applications of PBA-templated metal oxides,metal chalcogenides,metal phosphides,and other nanocomposites are systematically evaluated,facilitating the establishment of a structure–activity correlation for these *** on the fruitful achievements of PBA-derived nanocomposites,perspectives for their future development are envisioned,aiming to narrow down the gap between laboratory study and industrial reality.

关键词： Prussian blue analogues Self-sacrificial template Lithium-ion batteries Sodium-ion batteries Potassium-ion batteries

Axial coordinated iron-nitrogen-carbon as efficient electrocatalysts for hydrogen evolution and oxygen redox reactions

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Chinese Chemical Letters 2025年第1期36卷 637-642页

作者： Yanan Zhou Li Sheng Lanlan Chen Wenhua Zhang Jinlong Yang School of Material Science and Chemical Engineering Institute of Mass SpectrometryNingbo UniversityNingbo 315211China Department of Chemical physics University of Science and Technology of ChinaHefei 230026China Department of Material Science and Engineering University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Materials for Energy Conversion and Synergetic Innovation Centre of Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China

Designing highly active electrocatalysts for the hydrogen evolution reaction(HER)and oxygen evolution and reduction reactions(OER and ORR)is pivotal to renewable energy ***,based on density functional theory(DFT)calculations,we systematically investigate the catalytic activity of iron-nitrogen-carbon based covalent organic frameworks(COF)monolayers with axially coordinated ligands(denotes as Fe N_(4)-X@COF,X refers to axial ligand,X=-SCN,-I,-H,-SH,-NO_(2),-Br,-ClO,-Cl,-HCO_(3),-NO,-ClO_(2),-OH,-CN and-F).The calculated results demonstrate that all the catalysts possess good thermodynamic and electrochemical *** different ligands axially ligated to the Fe active center could induce changes in the charge of the Fe center,which further regulates the interaction strength between intermediates and catalysts that governs the catalytic ***,FeN_(4)-SH@COF and Fe N_(4)-OH@COF are efficient bifunctional catalysts for HER and OER,FeN_(4)-OH@COF and FeN_(4)-I@COF are promising bifunctional catalysts for OER and *** findings not only reveal promising bifunctional HER/OER and OER/ORR catalysts but also provide theoretical guidance for designing optimum ironnitrogen-carbon based catalysts.

关键词： Axial coordinated ligands DFT calculation Hydrogen evolution reaction Oxygen evolution reaction Oxygen reduction reaction