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High-precision magnetic field measurement system based on a coherent population trapping magnetometer onboard the SATech-01 satellite

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Science China Technological Sciences 2025年

作者： Hongbo XUE Wei SONG Haoran ZHAO Yiteng ZHANG Shanzhi YE Jindong WANG Ran TAO Peng SANG Keli CHEN Xingzi BI Bingjun CHENG Bin ZHOU Yongliang XUE Yingying TANG liu liu Jinsong LI Xiaocheng ZHU Baoquan LI Jinguo liu Wen CHEN Xiaofeng ZHANG Yonghe ZHANG Lei LI State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences Key Laboratory of Solar Activity and Space Weather National Space Science Center Chinese Academy of Sciences Key Laboratory of Electronics and Information Technology for Space Systems National Space Science Center Chinese Academy of Sciences State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Innovation Academy for Microsatellites Chinese Academy of Sciences

On July 27, 2022, a high-precision system for measuring the magnetic field based on a coherent population trapping magnetometer（referred to as the CPT system） was launched onboard the Space Advanced Technology demonstration satellite（SATech-01） by a ZK-1A rocket. The payload comprises a scalar coherent population trapping magnetometer（CPTM）, triaxial anisotropic magnetoresistance magnetometer（AMRM）, and nano star tracker mounted on a non-magnetic telescopic tubular mast. This configuration enables synchronized measurement of scalar and vector geomagnetic fields, as well as the attitude,making the payload with its compact sensors suitable for applications on miniature satellite platforms. On November 7, 2022,the novel telescopic tubular mast was deployed in orbit, extending to a length of 5.28 m. The CPTM, an absolute scalar magnetometer with an omnidirectional sensor, is the first China-developed quantum/atomic magnetometer successfully operating in space. In orbit, the CPTM has sensitivity of ～10 pT/Hz1/2and can automatically operate under complex magnetic field variations. The difference between the scalar fields obtained using the CPTM and CHAOS model has a mean deviation of–3.73 n T and a standard deviation of 26.11 nT（1σ）, without on-orbit calibration or correction. The miniaturized AMRM has a sensitivity of ～0.3 n T/Hz1/2and maintains stable and reliable operation in orbit. The low-power and miniaturized nano star tracker has a measurement uncertainty of 14.23″（1σ） in orbit. The mission has realized the on-orbit technical verification of the integrated and synchronized detection of the vector magnetic field and attitude and fully validated the system's performance,automation level, and reliability.

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大规模突发事件下基于“派单+抢单”的平台配送模式优化模型

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物流科技 2025年第1期48卷 34-38,62页

作者：刘柳孟令鹏武汉华夏理工学院商学院湖北武汉430223 上海海事大学中国(上海)自贸区供应链研究院上海201306

大规模突发事件会导致平台配送面临订单模糊、车辆配送路网复杂、取送货序列配对困难等现实问题。文章提出一种基于平台“派单+抢单”的组合运营模式,充分发挥派单模式高效匹配配送员-订单,以及抢单模式有效提升平台配送灵活性的优势,... 详细信息

大规模突发事件会导致平台配送面临订单模糊、车辆配送路网复杂、取送货序列配对困难等现实问题。文章提出一种基于平台“派单+抢单”的组合运营模式,充分发挥派单模式高效匹配配送员-订单,以及抢单模式有效提升平台配送灵活性的优势,以配送成本最低、客户满意度最高为优化目标,建立多目标混合整数规划模型,并设计基于GA-SA的混合进化算法对配货员的配送路径进行合理规划,保障商家、客户多对关系下的货物取送有序。数值实验表明,所设计的优化算法能够有效解决抢单模式下的即时配送车辆路径问题,具有很好的效率和应用性。

关键词：大规模公共事件即时配送多目标规划模型混合进化算法

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Erratum to “Interference management in 6G space and terrestrial integrated networks: Challenges and approaches” by Shi Yan, Xueyan Cao, Zile liu, and Xiqing liu

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Intelligent and Converged Networks 2021年第1期2卷 83-83页

作者： Shi Yan Xueyan Cao Zile liu Xiqing liu

One sentence“In the International Telecommunication Union Radiocommunication Sector,the frequency sharing issues between the satellite and terrestrial communication networks in the millimeterwave band have been acknowledged and were reported at the 2019 World Radiocommunication Conference”at Page 272 in the article“Interference management in 6G space and terrestrial integrated networks:Challenges and approaches.1”which appeared in vol.1,no.3 of Intelligent and Converged Networks,was not correct in the published *** correct contents are below:“In the International Telecommunication Union Radiocommunication Sector,the frequency sharing issues between the satellite and terrestrial communication networks in the millimeterwave band have been addressed and the results have been reported to the 2019 World Radiocommunication Conference,which has decided to allocate some additional frequency bands to the terrestrial networks in the mobile service.”

关键词： communication Interference networks

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Consensus problem of second-order multi-agent systems with time-varying communication delay and switching topology

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Journal of Systems Engineering and Electronics 2011年第4期22卷 672-678页

作者： Chenglin liu Fei liu Institute of Automation Jiangnan University Wuxi 214122 E R. China

Leader-following stationary consensus problem is investigated for the second-order multi-agent systems with timevarying communication delay and switching topology. Based on Lyapunov-Krasovskii functional and Lyapunov-Razumikhin functions respectively, consensus criterions in the form of linear matrix inequality （LMI） are obtained for the system with time-varying communication delays under static interconnection topology con- verging to the leader＇s states. Moreover, the delay-dependent consensus criterion in the form of LMI is also obtained for the system with time-invariant communication delay and switching topologies by constructing Lyapunov-Krasovskii functional. Numerical simulations present the correctness of the results.

关键词： second-order multi-agent system time-varyingcommunication delay switching topology Lyapunov-Krasovskii,Lyapunov-Razumikhin.

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Surface modification of nanozymes

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Nano Research 2017年第4期10卷 1125-1148页

作者： Biwu liu Juewen liu Department of Chemistry Waterloo Institute for Nanotechnology University of Waterloo Waterloo Ontario N2L 3G 1 Canada

Nanoparticles and proteins are similar in a number of aspects, and using nanoparticles to mimic the catalytic function of enzymes is an interesting yet challenging task. Impressive developments have been made over the past two decades on this front. The term nanozyme was coined to refer to nanoparticle- based enzyme mimics. To date, many different types of nanozymes have been reported to catalyze a broad range of reactions for chemical, analytical, and biomedical applications. Since chemical reactions happen mainly on the surface of nanozymes, an interesting aspect for investigation is surface modification. In this review, we summarize three types of nanozyme materials catalyzing various reactions with a focus on their surface chemistry. For metal oxides, cerium oxide and iron oxide are discussed as they are the most extensively studied. Then, gold nanoparticles and graphene oxide are reviewed to represent metallic and carbon nanomaterials, respectively. Types of modifications include ions, small molecules, and polymers mainly by physisorption, while in a few cases, covalent modifications were also employed. The functional aspect of such modification is to improve catalytic activity, substrate specificity, and stability. Future perspectives of this field are speculated at the end of this review.

关键词： enzyme-mimics nanozymes adsorption peroxidases biosensors

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The polynomial-like iterative equation for PM functions

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Science China Mathematics 2017年第8期60卷 1503-1514页

作者： liu liu GONG XiaoBing Department of Mathematics Southwest Jiaotong University Department of Mathematics Neijiang Normal University

The polynomial-like iterative equation is an important form of functional equations, in which iterates of the unknown function are linked in a linear combination. Most of known results were given for the given function to be monotone. We discuss this equation for continuous solutions in the case that the given function is a PM(piecewise monotone) function, a special class of non-monotonic functions. Using extension method, we give a general construction of solutions for the polynomial-like iterative equation.

关键词： functional equation iteration non-monotonicity continuous solution leading coefficient problem

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Energy Management and Optimization of Vehicle-to-grid Systems for Wind Power Integration

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CSEE Journal of Power and Energy Systems 2021年第1期7卷 172-180页

作者： Wei Wang liu liu Jizhen liu Zhe Chen the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China the School of Control and Computer Engineering North China Electric Power UniversityBeijing 102206China with the Department of Energy Technology Aalborg University9220 AalborgDenmark

An approach to smoothing the fluctuations of largescale wind power is investigated using vehicle-to-grid(V2G)***,an energy management and optimization system is designed and *** using the wavelet packet decomposition method,the target grid-connected wind power,the required electric vehicle(EV)power,and supercapacitor power are *** energy management model for EVs is then developed by introducing a knapsack problem that can evaluate the needs of an EV ***,an optimized dispatch strategy for EVs and wind power is developed by using a dynamic programming method.A case study demonstrates that the energy management and optimization method for V2G systems achieves noticeable performance improvements over benchmark techniques.

关键词： Dynamic programming electric vehicle knapsack problem wavelet packet decomposition wind power integration

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Linear stability analysis of convection in two-layer system with an evaporating vapor-liquid interface

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Acta Mechanica Sinica 2006年第2期22卷 109-119页

作者： Rong liu Qiusheng liu Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China

Classical theories have successfully provided an explanation for convection in a liquid layer heated from below without evaporation. However, these theories are inadequate to account for the convective instabilities in an evaporating liquid layer, especially in the case when it is cooled from below. In the present paper, we study the onset of Marangoni convection in a liquid layer being overlain by a vapor layer. A new two-sided model is put forward instead of the one-sided model in previous studies. Marangoni-Béard instabilities in evaporating liquid thin layers are investigated with a linear instability analysis. We define a new evaporation Blot number, which is different from that in previous studies and discuss the influences of reference evaporating velocity and evaporation Blot number on the vapor-liquid system. At the end, we explain why the instability occurs even when an evaporating liquid layer is cooled from below.

关键词： Evaporation Marangoni-Bénard instability Convection

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Study on Metallurgical Reaction in Molten Steel with Coal-Oxygen Injection

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Journal of Iron and Steel Research International 1998年第1期5卷 1-7页

作者： liu liu Central Iron and Steel Research Institute MMI

By technological experiments on bottom pulverized coal injection in a 10 t converter,the metallurgical reaction of continuous coal-oxygen injected into molten steel was *** assumption of direct burning of coal in molten steel is proposed and the result that low carbon steel can also be produced with coal injection is *** formulae for decarburization of melting bath were *** apparent desulphurization rate constant is measured and activation energy of dephosphorization *** influence of coal injection on nitrogen pick-up is studied too.

关键词： converter physical chemistry of coal injection decarburization coal-oxygen injection

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Application of Al-free deoxidizer in rail steel manufacture

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Journal of University of Science and Technology Beijing 2008年第5期15卷 534-537页

作者： Wei Wu liu liu Metallurgical Technology Research Department Central Iron ＆ Steel Research Institute Beijing 100081 China

Because there are a lot of influences of alumina inclusions on the performance of rail steel,it is reasonable to adopt the deoxidization method with Al-free deoxidizer. According to the characteristics of Al-free deoxidization process,the control of aluminum content,the deoxidization with ladle furnace（LF） slag,the deoxidization process under vacuum by carbon,and the inclusions modification technology by calcium treatment were studied. All of them were applied to practical production. The results indicate that the adoption of Al-free deoxidization process leads to the total oxygen content in the steel below 20 ppm,which meets the requirement of clean rail steel.

关键词： rail steel deoxidizer refining oxygen activity

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