期刊,中国科学:技术科学（英文版） 2024年卷12期_国家学术搜索

期刊信息/Journal information

中国科学:技术科学（英文版）

主　　编：周光召

出版周期：月刊

国际刊号：1674-7321

电子邮箱：sales@scichina.org

电　　话：010-64019820

邮政编码：100717

地　　址：北京东黄城根北街16号

中国科学:技术科学（英文版）/Journal Science China Technological SciencesCSCDCSTPCDEISCI

查看更多>>《中国科学》是中国科学院主办、中国科学杂志社出版的自然科学专业性学术刊物。《中国科学》任务是反映中国自然科学各学科中的最新科研成果，以促进国内外的学术交流。《中国科学》以论文形式报道中国基础研究和应用研究方面具有创造性的、高水平的和有重要意义的科研成果。在国际学术界，《中国科学》作为代表中国最高水平的学术刊物也受到高度重视。国际上最具有权威的检索刊物SCI，多年来一直收录《中国科学》的论文。1999年《中国科学》夺得国家期刊奖的第一名。

正式出版

收录年代

Practically fixed-time adaptive consensus control for multiagent systems with prescribed performance

ZHENG ShuaiPengMA HuiREN HongRuLI HongYi...

3867-3876页

查看更多>>摘要：In this paper,the fixed-time consensus tracking control problem of multiagent systems(MASs)subject to unknown nonlinearities and performance constraints is investigated.Initially,an improved fixed-time performance function is designed,which enables the consensus tracking errors to converge to the preset region in fixed time,and alleviates the initial error conditions by setting the parameters appropriately.Moreover,the unknown nonlinearities of MASs are approximated by the radial basis function neural network(RBF NN).Subsequently,a fixed-time prescribed performance controller is designed,which excludes the fractional power of tracking error to prevent potential singularity problems existing in stability proof.Additionally,a fixed-time dynamic surface filter is formulated to eliminate the"explosion of complexity"issue,meanwhile,the filter errors are bounded in fixed time.Utilizing the Lyapunov stability theory,it can be guaranteed that all signals in MASs exhibit practically fixed-time stability,and the consensus errors all approach a small region centered on origin within the prescribed bounds.Finally,simulations are presented to verify the validity of the proposed control strategy.

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万方数据

Fabrication of ridged microstructures on FeCrAl porous metal support enhanced catalyst coating performance by UV-laser micromilling

LI XinYingGAO ChaoCHEN YingZHOU Wei...

3877-3889页

查看更多>>摘要：The enhancement of catalyst coating performance is significantly influenced by the microstructures on the surface of catalyst supports.This study explores the fabrication of ridged microstructures on the surface of the FeCrAl porous metal,which serves as electrified catalyst support for methanol steam reforming(MSR),using ultraviolet(UV)-laser micromilling technology.The formation mechanism of these ridged microstructures was thoroughly analyzed.Surface morphology under different laser processing parameters was examined using scanning electron microscopy(SEM).Surface oxygen context and roughness were measured with energy-dispersive X-ray spectroscopy and a 3D laser confocal microscope,respectively.Contact angles of the microstructures under different laser conditions were observed using a contact angle measuring instrument.After laser pro-cessing,the porous metal supports were loaded with catalysts,and the performance of these catalyst coatings was tested using ultrasonic vibration tests.SEM observations highlighted improved uniformity of the catalyst coating on the support after laser processing.Experimental results showed that supports processed with UV lasers exhibited better hydrophilicity,with contact angles mostly less than 90°,facilitating better diffusion and adhesion of the catalyst solution.Optimal catalyst coating per-formance on FeCrAl porous metal support with ridge microstructure surface was achieved with laser processing parameters set at 200 mm/s speed,40 kHz frequency,and 5 scans.The optimal microstructure surface demonstrated a load mass of approximately 0.5 g and a catalyst coating strength of 87.72％.This represents approximately 17 times and 10 times the performance of unprocessed surfaces,respectively,after 8 min of ultrasonic vibration.

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万方数据

A storm-time ring current model(STRIM)

YU YiQunMA LongXingWEI ZiMingAN DePeng...

3890-3908页

查看更多>>摘要：The ring current,one of the most important current systems around the Earth,intensifies during geomagnetic storms and is believed to be the main reason for large-scale magnetic field perturbations in the geospace environment.Understanding how the ring current builds up and evolves during geomagnetic storms is of great importance not only for advancing the knowledge of the Sun-Earth system but also for improving the modeling capability of predicting hazardous space weather events.Focusing on the national strategic needs in the space weather prediction,in this study,we establish a ring current model named storm time ring current model(STRIM).The STRIM comprehensively embraces key physical processes in association with ring current dynamics,including plasma source injections from the nightside plasmasheet and transport around the Earth,charge-exchange with neutral hydrogens,Coulomb collisions with thermal plasma,wave-particle interactions,field line curvature scattering,and precipitation loss down to the upper atmosphere.The electric fields needed for particle motion can be optionally taken from empirical models or self-consistently calculated,while the magnetic field configuration is obtained from Tsyganenko 2005 model.Simulation results are verified against the published literature and validated with in-situ satellite or ground-based observations and are found to have the same high-level capability and fidelity as other well-known published models.We also discuss future tasks of fostering the model's performance and potential applications.

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万方数据

High-energy electron spectrometer on Macao Science Satellite-1

YE YuGuangLIU YingZOU HongZONG QiuGang...

3909-3924页

查看更多>>摘要：Macao Science Satellite-1(MSS-1)is a two-star constellation mission sponsored jointly by the China National Space Ad-ministration(CNSA)and the Macau University of Science and Technology(MUST).The mission aims to explore the geo-magnetic field and space particle radiation environment in low-inclination low Earth orbit.The satellite A of MSS-1(MSS-1 A)carries the third-generation high-energy electron spectrometer(HES),developed by Peking University,to detect high-energy electrons.The HES sensor head utilizes a conventional AE-E silicon detector telescope,enabling measurements of high-energy electrons within a 45°cone angle field of view,ranging from 0.3 to 3.0 MeV.As a new generation of high-energy electron detectors(HEDs),the HES operates by default in the in-orbit multi-channel mode,allowing 128 segmented linear distributed energy bin counting measurements with a time resolution of 1 s.High energy resolution observations of high-energy electrons in the inner radiation belt by the HES onboard MSS-1 A can help investigate the following questions:Do MeV electrons exist in the inner radiation belt?What is the production mechanism of relativistic electrons in the inner radiation belt?

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万方数据

Effects of mechanical interfaces on magnetic levitation systems and analysis of self-excited vibration mechanisms in coupled systems

TANG JingHuLI ChaoFengZHOU JinWU ZhiWei...

3925-3939页

查看更多>>摘要：Magnetic levitation is a non-self-stabilizing system that requires high control performance.The system's stability is affected by the mechanical interface between the levitation object and the loading device,with self-excited vibration generated in the operation process.This paper proposes to consider the mechanical behavior of the contact interface in the magnetic levitation system.Since electromagnetic and control systems are mechanically equivalent,the coupled electric-magnetic-mechanical model is established by adopting the lumped mechanical modeling method.Furthermore,the effect of the contact clearance on the mechanical behavior of the system is analyzed using the Routh-Hurwitz theory.The research results show that with the decrease in the contact clearance,the vibration frequency increases.When the vibration frequency exceeds the critical value,a continuous vibration phenomenon occurs in the system under the joint action of feedback and energy mechanisms.Finally,the effect of interface parameters on the vibration characteristics is analyzed using the fourth-order Runge-kutta numerical method.The analyses show that the interface contact leads to combination frequency and frequency multiplication components in the coupled system.

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万方数据

Low-carbon and economic operation of energy hub considering cooperative operation strategy with wind farm and photovoltaic station

HUANG YuJingLIU NianCHEN ZhengXU JieYan...

3940-3955页

查看更多>>摘要：With growing demands for carbon emission reductions,stringent policies necessitate the transition towards low-carbon,cost-effective energy hub(EH)operations.Leveraging the integration of renewable energy sources,especially wind farms(WF)and photovoltaic(PV)stations,offers a significant opportunity for carbon emission reduction in EHs.This study introduces a method promoting low-carbon,economical operations for EHs in collaboration with WFs and PV stations.The research first outlines carbon emission dynamics for EHs in both cooperative and independent scenarios.Next,the study develops operational benefit models for WFs,PV stations,and EHs,factoring in the multifaceted electricity transactions between these entities and the main power grid.An optimization approach rooted in Nash bargaining gets introduced for the combined operation of WFs,PV stations,and EHs,accompanied by a decentralized algorithm to determine the Nash solution.The case study reveals that,against standalone operations,the cooperative strategy enhances operational gains for WFs and PV stations by 17.28％and 11.58％respectively while reducing EH operational costs and carbon emissions by 9.31％and 6.75％.

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