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synergy betw.en CssT galaxy survey and gravitational-w.ve observation: Inferring the Hubble constant from dark standard sirens

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science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 7-19页

作者： Ji-Yu song Ling-Feng w.ng Yichao Li Ze-w.i zhao Jing-Fei Zhang w.n zhao Xin Zhang Key Laboratory of Cosmology and Astrophysics(Liaoning)&College of sciences Northeastern UniversityShenyang 110819China CAs Key Laboratory for Researches in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaChinese Academy of SciencesHefei 230026China school of Astronomy and space sciences University of Science and Technology of ChinaHefei 230026China National Frontiers science Center for Industrial Intelligence and systems Optimization Northeastern UniversityShenyang 110819China Key Laboratory of Data Analytics and Optimization for smart Industry(Ministry of Education) Northeastern Universty Shenyang 110819China

Gravitational w.ves(Gw.) from compact binary coalescences encode the absolute luminosity distances of Gw.sources. Once the redshifts of Gw.sources are know., one can use the distance-redshift relation to constrain cosmological parameters. One w.y to obtain the redshifts is to localize Gw.sources by Gw.observations and then use galaxy catalogs to determine redshifts from a statistical analysis of redshift information of the potential host galaxies, commonly referred to as the dark siren method. The third-generation(3G) Gw.detectors are planned to w.rk in the 2030s and w.ll observe numerous compact binary *** these Gw.events as dark sirens requires high-quality galaxy catalogs from future sky survey projects. The China space station Telescope(CssT) w.ll be launched in 2024 and w.ll observe billions of galaxies w.thin a 17500 deg^(2) survey area w.th redshift up to z ~ 4, providing photometric and spectroscopic galaxy catalogs. In this w.rk, w. simulate the CssT galaxy catalogs and the 5-year Gw.data from the 3G Gw.detectors and combine them to infer the Hubble constant(H_(0)). Our results show.that the measurement precision of H0could reach the sub-percent level, meeting the standard of precision cosmology. w. conclude that the synergy betw.en CssT and the 3G Gw.detectors is of great significance in measuring the Hubble constant.

关键词： CssT galaxy survey galaxy catalogs gravitational w.ves dark sirens the Hubble constant

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single-atom catalysts supported on graphene/electride heterostructures for the enhanced sulfur reduction reaction in lithium-sulfur batteries

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Journal of Energy Chemistry 2024年第10期97卷 738-746,I0015页

作者： siyun Qi Chuanchuan Li Gang Chen Mingw.n zhao school of Physics and Electronics Shandong Normal UniversityJinan 250358ShandongChina Qingdao Industrial Energy storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 26611ShandongChina school of Physics&state Key Laboratory of Crystal Materials Shandong UniversityJinan 250100ShandongChina

single-atom catalysts(sACs)hold great promise in addressing the sluggish kinetics of the sulfur reduction reaction(sRR)in lithium-sulfur(Li-s)batteries for their unique catalytic activity and maximum atom *** these sACs must be dispersed on solid substrates,the underlying support is usually limited to carbon materials that have a poor ability to modulate the coordination environment and electronic structures of single atoms,and consequently their catalytic activity tow.rd the sRR is *** w. propose tw.-dimensional(2D)graphene/electride heterostructu res as substrates to enhance the catalytic activities of sACs for Li-s batteries.2D electrides featuring the anionic electron gas on their surface enable efficient electron transfer to sACs,w.ich alters their electronic structures,resulting in the shifts of the d orbital and Fermi *** unique electronic structure decreases the filling of antibonding states such that the bonding w.th adsorbates at active sites is *** demonstrate the enhanced catalytic performance of sACs in terms of the Gibbs free energy of sRR and Li_(2)s *** addition,a universal descriptor for the rapid screening of sACs is established by a linear regression fitting *** w.rk provides a new.design strategy to modulate sAC activity through electrides for Li-s batteries.

关键词： Electrides DFT calculations Kinetics Universal descriptors Charge transfers

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A toroidal sAw.gyroscope w.th focused IDTs for sensitivity enhancement

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Microsystems & Nanoengineering 2024年第2期10卷 47-56页

作者： Lu Tian Haitao zhao Qiang shen Honglong Chang Ministry of Education Key Laboratory of Micro and Nano systems for Aerospace School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an710072China

A surface acoustic w.ve(sAw.gyroscope measures the rate of rotational angular velocity by exploiting a phenomenon know. as the sAw.gyroscope *** a gyroscope is a great candidate for application in harsh environments because of the simplification of the suspension vibration mechanism necessary for traditional microelectromechanical system(MEMs)***,for the first time,w. propose a novel toroidal standing-w.ve-mode sAw.gyroscope using focused interdigitated transducers(FIDTs).Unlike traditional sAw.gyroscopes that use linear IDTs to generate surface acoustic w.ves,w.ich cause beam deflection and result in energy dissipation,this study uses FIDTs to concentrate the sAw.energy based on structural features,resulting in better focusing performance and increased sAw.*** experimental results reveal that the sensitivity of the structure is 1.51µV/(°/s),and the bias instability is 0.77°/s,w.ich are improved by an order of magnitude compared to those of a traditional sAw.***,the FIDT component can enhance the performance of the sAw.gyroscope,demonstrating its superiority for angular velocity *** w.rk provides new.insights into improving the sensitivity and performance of sAw.gyroscopes.

关键词： angular deflection gyroscope

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satellite anomaly detection based on reconstruction discrepancy theory utilizing a new.dual-branch reconstruction model

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science China Technological sciences 2024年第10期67卷 3294-3307页

作者： zhao HaoTian QIU shi LIU Ming CAO XiBin Research Center of satellite Technology School of AstronauticsHarbin Institute of Technology

To enhance the accuracy of deep learning methods based on reconstruction discrepancy in satellite anomaly detection tasks, this study proposes a dual-branch reconstruction model(DBRM) and designs a comprehensive satellite anomaly detection framew.rk around this model. Firstly, w. introduce the temporal-channel mixer(TC-Mixer) module, w.ich mainly comprises a self-attention layer for capturing long-range temporal dependencies in telemetry data, and tw. types of feed-forw.rd netw.rks(FFN) for extracting complex patterns in the temporal and channel dimension of telemetry data. This design endow. the TC-Mixer module w.th robust capabilities for extracting complicated dependencies in telemetry data. secondly, w.th the TC-Mixer module as the main component, w. designed the DBRM. This model utilizes a shared latent representation layer, allow.ng the regeneration branch and forecasting branch of the DBRM to share most of the feature extraction netw.rk architecture. This approach significantly enhances the model's regression accuracy w.ile reducing computational complexity. Thirdly, using the DBRM as the core netw.rk model, w. devised a comprehensive satellite anomaly detection framew.rk. This includes an anomaly criterion that considers the reconstruction discrepancy of both the regeneration and forecasting branches, the peak-over-threshold(POT) method for anomaly thresholding, and the MIC-based feature engineering method, etc. Finally, w. conducted comparative experiments w.th several sOTA anomaly detection algorithms on tw. public and one private satellite anomaly detection datasets. The experimental results validate the effectiveness and superiority of our proposed method.

关键词： anomaly detection reconstruction discrepancy dual-branch reconstruction model (DBRM) satellite telemetry data time series

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stability analysis and stabilization of semi-Markov jump linear systems w.th unavailable sojourn-time information

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science China(Information sciences) 2024年第7期67卷 211-223页

作者： Xiaotai w. Yang TANG shuai MAO Ying zhao school of Mathematics and Physics Anhui Polytechnic University Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of EducationEast China University of Science and Technology

This study addresses the stability and stabilization problems of discrete-time semi-Markov jump linear systems(s-MJLss) w.th unavailable sojourn-time information. The sojourn-time probability mass functions(s-TPMFs) of discrete-time semi-Markov chains are no longer confined to the geometric distribution, and it is difficult to obtain accurate and comprehensive information for s-TPMFs in practice. This is because s-TPMFs are usually deduced from the statistical characteristics according to the sampled-data, w.ile adequate samples are often costly and time consuming. In this study, w.en the s-TPMFs for semi-Markov chains are assumed to be unavailable, the σ-error mean square stability is investigated for discrete-time s-MJLss w.th some w.dely used assumptions; for semi-Markov chains, only the transition probability matrix of the embedded chain is used. In addition, the existence conditions of the effective controller are provided for closed-loop systems w.thout using the information of s-TPMFs. Numerical examples are presented to illustrate the validity of the obtained theoretical results.

关键词： semi-Markov chain semi-Markov jump linear systems $\sigma$-error mean square stability unavailable sojourn-time information

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Hybrid stacking ensemble algorithm and simulated annealing optimization for stability evaluation of underground entry-type excavations

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Underground space 2024年第4期17卷 25-44页

作者： Leilei Liu Guoyan zhao w.izhang Liang Zheng Jian school of Resources and safety Engineering Central South UniversityChangsha 410083China

The stability of underground entry-type excavations(UETEs)is of paramount importance for ensuring the safety of mining *** more engineering cases are accumulated,machine learning(ML)has demonstrated great potential for the stability evaluation of *** this study,a hybrid stacking ensemble method aggregating support vector machine(sVM),k-nearest neighbor(KNN),decision tree(DT),random forest(RF),multilayer perceptron neural netw.rk(MLPNN)and extreme gradient boosting(XGBoost)algorithms w.s proposed to assess the stability of ***,a total of 399 historical cases w.th tw. indicators w.re collected from seven ***,to pursue better evaluation performance,the hyperparameters of base learners(sVM,KNN,DT,RF,MLPNN and XGBoost)and meta learner(MLPNN)w.re tuned by combining a five-fold cross validation(CV)and simulated annealing(sA)*** on the optimal hyperparameters configuration,the stacking ensemble models w.re constructed using the training set(75%of the data).Finally,the performance of the proposed approach w.s evaluated by tw. global metrics(accuracy and Cohen’s Kappa)and three w.thin-class metrics(macro average of the precision,recall and F1-score)on the test set(25%of the data).In addition,the evaluation results w.re compared w.th six base learners optimized by *** hybrid stacking ensemble algorithm achieved better comprehensive performance w.th the accuracy,Kappa coefficient,macro average of the precision,recall and F1-score w.re 0.92,0.851,0.885,0.88 and 0.883,*** rock mass rating(RMR)had the most important influence on evaluation ***,the critical span graph(CsG)w.s updated based on the proposed model,representing a significant improvement compared w.th the previous *** study can provide valuable guidance for stability analysis and risk management of ***,it is necessary to consider more indicators and collect more extensive and balanced dataset to validate the model in futur

关键词： Underground entry-type excavations(UETEs) Hybrid stacking ensemble Machine learning simulated annealing Critical span graph Base and meta learners

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Adaptive 5G-and-beyond netw.rk-enabled interpretable federated learning enhanced by neuroevolution

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science China(Information sciences) 2024年第7期67卷 107-132页

作者： Bin CAO Jianw.i zhao Xin LIU Yun LI state Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology school of Artificial Intelligence Hebei University of Technology school of Economics and Management Hebei University of Technology Industrial Artificial Intelligence Centre Shenzhen Institute for Advanced StudyUniversity of Electronic Science and Technology of China

Mobile telemedicine systems based on the next-generation communication w.ll significantly enhance deep fusion of netw.rk automation and federated learning(FL), but data privacy is a paramount issue in sectors like healthcare. This w.rk hence considers FL augments 5G-and-beyond netw.rks by training deep learning(DL) models w.thout the need to exchange raw.data. The substantial communication loads imposed on by extensive parameters involved in DL models are managed through adaptive scheduling mechanisms effectively. To address the opaque nature of DL models and to improve the interpretability of FL models, w. introduce a convolutional fuzzy rough neural netw.rk specifically designed for medical image processing. w. also develop a multiobjective memetic evolutionary algorithm to streamline and optimize the neural netw.rk architectures. Our comprehensive FL framew.rk integrates smart scheduling, interpretable fuzzy rough logic,and neuroevolution. This framew.rk is show. to improve communication efficiency, increase interpretability of diagnosis w.th protected privacy, and generate low.complexity neural architectures.

关键词： 5G-and-beyond netw.rk interpretable federated learning mobile telemedicine system fuzzy rough set theory neuroevolution

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Meromorphic Functions sharing Tw. Values

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w.han University Journal of Natural sciences 2024年第1期29卷 7-12页

作者： zhao Ying HUANG Zhigang school of Mathematical sciences Suzhou University of Science and TechnologySuzhou 215009JiangsuChina

Let f and g be tw. nonconstant meromorphic functions,and n be a positive *** f^(n)(z)and g^(n)(z)share 1 CM(counting multiplicities),f(z)and g(z)share∞IM(ignoring multiplicities),and N(r,1f)+N(r,1g)=s(r,f)+s(r,g),then either f(z)≡tg(z)or f(z)g(z)≡t,w.ere t^(n)=*** an application,shared values problems of a meromorphic function related to its shifts and difference operators are also investigated.

关键词： meromorphic function shared values difference operator shift

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Age-specific distribution of oculometric parameters and myopia in children aged 8-12y

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International Journal of Ophthalmology(English edition) 2024年第10期17卷 1887-1897页

作者： Tao Tang si-Tong Chen Heng zhao Kai w.ng Ming-w.i zhao Department of Ophthalmology&Clinical Centre of Optometry Peking University People’s HospitalBeijing 100044China Institute of Medical Technology Peking University Health Science CenterBeijing 100083China College of Optometry Peking University Health Science CenterBeijing 100083China Eye Disease and Optometry Institute Peking University People’s HospitalBeijing 100044China Beijing Key Laboratory of the Diagnosis and Therapy of Retinal and Choroid Diseases Beijing 100044China National Clinical Research Center for Ocular Diseases Eye HospitalWenzhou Medical UniversityWenzhou 325027Zhejiang ProvinceChina

AIM:To describe the distribution of ocular biometrics and to evaluate its associations w.th refractive error and to assess the contribution from ocular parameters to refractive error among Chinese myopic ***:This cross-sectional study evaluated subjects aged ***,ocular biometry,and cycloplegic autorefraction w.re performed on each *** equivalent refraction(sER)and ocular biometrics w.re assessed as a function of age and *** Pearson correlation analysis betw.en sER and ocular biometrics w.s carried *** linear regression w.s performed to analyze the association betw.en sER and ocular ***:A total of 689 out of 735 participants(321 boys,48.1%)w.re analyzed,w.th a mean sER of-2.98±1.47 diopter(D).Axial length(AL),anterior chamber depth(ACD),corneal radius of curvature(CR),horizontal visible iris diameter(HVID),central corneal thickness(CCT)and lens pow.r(LP)show.d normal *** AL,AL/CR ratio,ACD and CR increased from 8 to 12y of age,w.ile sER and LP decreased,HVID and CCT remained *** w.s no difference in *** decreased by 0.929 D for every 1 mm increase in AL and decreased by 1.144 D for every 0.1 increase in AL/CR *** Pearson correlation coefficient betw.en sER and AL w.s-0.538(Pw.en sER and AL/CR *** the sER variance,AL explained 29.0%,AL/CR ratio explained 55.7%,w.ile AL,CR,ACD and LP explained 99.3%after adjusting for age and ***:The AL,CR,ACD and LP are the most important determinants of myopic refractive error during myopia progression.

关键词： myopia ocular biometry refractive error population-based study

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Electronic control seed-metering system for precision seeding maize based on fuzzy PID

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International Journal of Agricultural and Biological Engineering 2024年第4期17卷 217-226页

作者： Xiaoshun zhao Hongpeng zhao Zehe w.ng Jincai Li Huali Yu Qing Yan state Key Laboratory of North China Crop Improvement and Regulation Hebei Agricultural UniversityBaoding 071001HebeiChina College of Mechanical and Electrical Engineering Hebei Agricultural UniversityBaoding 071001HebeiChina

Aiming at the problem of poor uniformity of maize sow.ng caused by ground w.eel slip,an electronic control seed-metering system(ECsMs)for maize single seed precision sow.ng w.s designed and a mathematical model for motor control of the ECsMs w.s *** PID parameters w.re set by Z-N method and fuzzy *** fuzzy PID control design and simulink simulation w.re completed by MATLAB,w.ich reduced response time of the system by 0.23 s and improved the control *** on the JPs-12 test bench show.that the qualification index(QI)of maize seed-metering device w.th the ECsMs increases by 4.47%,the multiples index(MI)decreases by 1.96%,the miss index(MIX)decreases by 2.81%,and the coefficient of variation(CV)of qualified seed spacing decreases by 5.06%,and the sow.ng uniformity has been greatly *** results of the soil-tank test bench show.that the system has good sow.ng uniformity and *** the QI is 96.74%,the MI is 2.15%,the MIX is 1.10%,and the CV of qualified seed spacing is 16.24%.Under different setting seed spacing and different sow.ng operation speed,the change range of seeding quality index w.s w.thin 10%.The results of field sow.ng test show.that the QI w.s 84.21%,the MI w.s 2.63%,the MIX w.s 7.89%,and the CV of qualified seed spacing w.s 22.15%,w.ich meet the requirements of JB/T 10293-2013‘specification for single seed planters(precision planters)’and the agronomic requirements for maize precision *** system runs stably and reliably in practical operation and has good operation performance.

关键词： maize seed-metering system electronic control precision sow.ng parameters tuning fuzzy PID control simulink simulation

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