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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Mechanics & Astronomy) .卷 86-96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 Sciences Shanghai Astronomical Observatory Chinese Academy of Sciences School of Physics and Astronomy Shanghai Jiao Tong University School of Astronomy and Space Science University of Chinese Academy of Sciences Taiji Laboratory for Gravitational Wave Universe (Beijing/Hangzhou) University of Chinese Academy of Sciences Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Province Key Laboratory of Quantum Theory and Applications of MoE Lanzhou University Institute of Theoretical Physics & Research Center of Gravitation Lanzhou University International Centre for Theoretical Physics Asia-Pacific (ICTP-AP) University of Chinese Academy of Sciences (UCAS) Center for Gravitational Wave Experiment National Microgravity Laboratory Institute of Mechanics Chinese Academy of Sciences

One of the primary goals of space-borne gravitational wave detectors is to detect and analyze extreme-mass-ratio inspirals(EMRIs). This task is particularly challenging because EMRI signals are complex, lengthy, and faint. In this work, we introduce a2-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 100. Especially, 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 network. The mass and spin of the SMBH can be determined at 99% and 92% respectively. This 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 model. This 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

Metal organophosphates:electronic structure tuning from inert materials to universal alkali-metal-ion battery cathodes

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Rare Metals 2023年第1期42卷 122-133页

作者： Wu-Jie Dong jia-Bo Le Yan Jin guo-Qing Zhang bin Ye Peng Qin Fu-Qiang Huang State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China

Organic cathodes for alkali-metal-ion batteries attract great attentions in recent years,but the ion storage sites are limited to some finite functional *** is because an organic cathode must have proper lowest unoccupied molecular orbitals(LUMO) to accept electrons at high ***,a novel type of organophosphate-based cathode has successfully been explored by tuning the LUMO energy level of organophosphates through metal ions with an inert electron *** the first time,the P=O of phytate(PA),N,N,N’,N’-ethylenediaminetetrakis(methylene phytate)(EDTMP),and diethylenetriaminepentakis(methyl phytate)(DTPMP) is activated by lead/bismuth(with 6s2electron pair) to storage Li/Na/K ions ***,density functional theory calculations indicate that the LUMO energy of Bi-PA is greatly reduced from-0.99(PA) to-4.61 eV,which shows the first discharge capacity of 173,182 and 206mAh·g-1and the reversibly capacity of 102,102 and 101mAh·g-1with the discharge platform of 2.4,2.1 and 2.4 V for Li/Na/K-ion battery cathodes,***,with proper LUMO energy level,Pb-PA(-4.63 eV),Pb-EDTMP(-3.71 eV),and Pb-DTPMP(-4.45 eV) all exhibit admirable *** unique strategy of organic materials to alkali-metal-ion battery cathodes offers a new avenue for future energy storage systems.

关键词： Organic cathodes Alkali-metal-ion battery Lowest unoccupied molecular orbitals(LUMO) Organophosphates

Redesigned Surface Based Machining Strategy and Method in Peripheral Milling of Thin-walled Parts

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Chinese Journal of Mechanical Engineering 2010年第3期23卷 282-287页

作者： jia Zhenyuan guo Qiang SUN Yuwen guo Dongming Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education Dalian University of Technology Dalian 116024 China

Currently, simultaneously ensuring the machining accuracy and efficiency of thin-walled structures especially high performance parts still remains a challenge. Existing compensating methods are mainly focusing on 3-aixs machining, which sometimes only take one given point as the compensative point at each given cutter location. This paper presents a redesigned surface based machining strategy for peripheral milling of thin-walled parts. Based on an improved cutting force/heat model and finite element method（FEM） simulation environment, a deflection error prediction model, which takes sequence of cutter contact lines as compensation targets, is established. And an iterative algorithm is presented to determine feasible cutter axis positions. The final redesigned surface is subsequently generated by skinning all discrete cutter axis vectors after compensating by using the proposed algorithm. The proposed machining strategy incorporates the thermo-mechanical coupled effect in deflection prediction, and is also validated with flank milling experiment by using five-axis machine tool. At the same time, the deformation error is detected by using three-coordinate measuring machine. Error prediction values and experimental results indicate that they have a good consistency and the proposed approach is able to significantly reduce the dimension error under the same machining conditions compared with conventional methods. The proposed machining strategy has potential in high-efficiency precision machining of thin-walled parts.

关键词： redesigned surface tool path part deflection error prediction finite element method

Bilayer Compounded Polytetrafluoroethylene Membrane for Enhanced Oil-Water Emulsion Separation

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Chinese Journal of Polymer Science 2024年第6期42卷 838-850页

作者： Yu-Liang Yang Tai-Ran Zhang Yan-Ting Han Shao-Yun guo Qin-Gong Rong jia-bin Shen State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversitySichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing TechnologyChengdu610065China West China Hospital/West China School of Nursing Sichuan UniversityChengdu610041China Shandong Senrong New Materials Co. Ltd.Zibo256401China

In order to achieve efficient and durable oil-water emulsion separation,the membranes possessing high separation efficiency and mechanical strength attract extensive attention and are in great *** present study,a kind of polytetrafluoroethylene(PTFE)-based bilayer membrane was fabricated by electrospinning fibrous PTFE(fPTFE)on an expanded PTFE(ePTFE)*** morphological observation revealed that the fibrous structure of the fPTFE layer could be tailored by controlling the formulation of spinning *** addition of appropriate polyoxyethylene(PEO)would make the fibers in the fPTFE layer finer and more *** a result,the compounded membrane exhibited a small pore size of approximately 1.25µm and a substantial porosity nearing 80%.This led to super-hydrophobicity,characterized by a high water contact angle(WCA)of 149.8°,and facilitated rapid oil *** water-in-oil emulsion separation experiment further confirmed that the compounded membrane not only had a high separation efficiency closing 100%,but such an outstanding separation capacity could be largely retained,either through multiple cycles of use or through strong acid(pH=1),strong alkali(pH=12),or high-temperature(100°C)***,the mechanical behavior of the bilayer membrane was basically contributed by that of each layer in terms of their volume *** significantly,the poor creep resistance of fPTFE layer was suppressed by compounding with ePTFE ***,this study has laid the groundwork for a novel approach to create PTFE-based compounded membranes with exceptional overall characteristics,showing promise for applications in the realm of emulsion separation.

关键词： ePTFE Electrospinning membrane Bilayer compounding Emulsion separation

Petrov-Galerkin Spectral Element Method for Mixed Inhomogeneous Boundary Value Problems on Polygons

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Chinese Annals of Mathematics,Series B 2010年第6期31卷 855-878页

作者： Hongli jia Benyu guo Department of Mathematics Shanghai Normal University Shanghai 200234 China Department of Mathematics Donghua University Shanghai 200065 China. Department of Mathematics Shanghai Normal University Scientific Computing Key Laboratory of Shanghai Universities Shanghai E-institute for Computational Science Shanghai 200234 China

The authors investigate Petrov-Galerkin spectral element method. Some results on Legendre irrational quasi-orthogonal approximations are established, which play important roles in Petrov-Galerkin spectral element method for mixed inhomogeneous boundary value problems of partial differential equations defined on polygons. As examples of applications, spectral element methods for two model problems, with the spectral accuracy in certain Jacobi weighted Sobolev spaces, are proposed. The techniques developed in this paper are also applicable to other higher order methods.

关键词： Legendre quasi-orthogonal approximation Petrov-Galerkin spectral element method Mixed inhomogeneous boundary value problems

A NEW PSEUDOSPECTRAL METHOD ON QUADRILATERALS

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Journal of Computational Mathematics 2016年第4期34卷 365-384页

作者： Benyu guo Hongli jia Shanghai Normal University 200234 Shanghai P.R. China Scientific Computing Key Laboratory of Shanghai Universities Division of Computational Science of E-institute of Shanghai Universities Department of Mathematics Donghua University 200065 Shanghai P.R. China

In this paper, we investigate a new pseudospectral method for mixed boundary value problems defined on quadrilaterals. We introduce a new Legendre-Gauss type interpolation and establish the basic approximation results, which play important roles in pseudospectral method for partial differential equations defined on quadrilaterals. We propose pseudospee- tral method for two model problems and prove their spectral accuracy. Numerical results demonstrate their high efficiency. The approximation results developed in this paper are also applicable to other problems defined on complex domains.

关键词： Legendre-Gauss type interpolation on quadrilaterals Pseudospectral methodof mixed boundary value problems.

Response of aerobic sludge to AHL-mediated QS:Granulation,simultaneous nitrogen and phosphorus removal performance

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Chinese Chemical Letters 2021年第11期32卷 3402-3409页

作者： jia Shuai Xiaoling Hu bin Wang Wanlin Lyu Rongfan Chen Wenbin guo Hongyu Wang Dao Zhou School of Civil Engineering Wuhan UniversityWuhan 430072China

The effects of different species and concentrations’signal molecules on aerobic activated sludge system were investigated through batch *** showed that the fastest NH^(+)_(4)-N oxidization rate and the most extracellular polymeric substances(EPS)secretion were obtained by adding 5 nmol/L N-hexanoyl-l-homoserine lactone(C_(6)-HSL)into the aerobic activated *** study investigated the correlation among N-acyl-homoserine lactones-mediated quorum sensing(AHLs-mediated QS),nutrient removal performances and microbial communities with the long-term addition of 5 nmol/L C_(6)-*** was found that C_(6)-HSL-manipulation could enhance the stability and optimize the decontamination performance of aerobic granular sludge(AGS)*** compositions considerably shifted with long-term C_(6)-*** C_(6)-HSL-manipulation inhibited quorum quenching-related(QQ-related)activities and enhanced QS-related activities during the stable *** proposed C_(6)-HSL-manipulation might be a potential technology to inhibit the growth of harmful bacteria in AGS,which could provide a theoretical foundation for the realization of more stable biological wastewater treatments.

关键词： Quorum sensing(QS) Aerobic granular sludge(AGS) Simultaneous nitrogen and phosphorus removal(SNDPR) N-acyl-homoserine lactones(AHLs) N-hexanoyl-L-homoserine lactone(C_(6)-HSL) Nitrogen transformation

Regulating the Photoisomerization of Covalent Organic Framework for Enhanced Photocatalytic Hydrogen Evolution

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Chinese Journal of Chemistry 2024年第21期42卷 2621-2626页

作者： Xingye Huang jia guo State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai200438 China

Covalent organic framework(COF)is a desirable platform to tailor electronic properties for improving photocatalytic ***,the study on excited-state configurations that determine photogenerated carrier dynamics has long been ***,we concentrate on the molecular design ofβ-ketoenamine-linked COFs to drive their photoisomerization via the excited-state intra-molecular proton transfer(ESIPT),which can induce the partial keto-to-enol tautomerization and accordingly rearrange the photoinduced charge *** demonstrate that the push-pull electronic effect of functional side groups attached on the framework linkers is directly correlated with the ESIPT *** phenylene linkers modified with electron-withdrawing cyano-groups reinforce the ESIPT-induced tautomerization,leading to the in situ partial enolization for extendedπ-conjugation and rearranged electron-hole *** contrast,the electron-rich linkers limit the photoisomerization of COF and suppress the photoinduced electron ***,the maximum hydrogen evolution rate is achieved by the cyano-modified COF,reaching as high as 162.72 mmol·g^(-1)·h^(-1) with an apparent quantum efficiency of 13.44%at 475 nm,which is almost 11.5-fold higher than those of analogous COFs with electron-rich *** work opens up an avenue to control over the excited-state structure transformation for enhanced photochemical applications.

关键词： Covalent organic framework Hydrogen evolution reaction Photoisomerization PhotocatalysisI Charge separation Watersplitting

Epigenetic changes in colorectal cancer

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Chinese Journal of Cancer 2013年第1期32卷 21-30页

作者： Yan jia Mingzhou guo Department of Gastroenterology & Hepatology Chinese PLA General Hospital Medical College of Nankai University

Epigenetic changes frequently occur in human colorectal *** global hypomethylation,gene promoter region hypermethylation,histone modifications,and alteration of miRNA patterns are major epigenetic changes in colorectal *** of imprinting(LOI) is associated with colorectal *** deficiency may cause colorectal carcinogenesis by inducing gene-specific hypermethylation and genomic global *** inhibitors and demethylating agents have been approved by the FDA for myelodysplastic syndrome and leukemia ***-coding RNA is regarded as another kind of epigenetic marker in colorectal *** review is mainly focused on DNA methylation,histone modification,and microRNA changes in colorectal cancer.

关键词：遗传变化大肠癌表观 microRNA 甲基化剂组蛋白修饰基因启动子区非编码RNA