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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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Recent progress in metal-organic frameworks(Part II—material application)

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Science China Chemistry 2025年

作者： Jiandong Pang Wentao Jiang Xue-Wen Zhang Hao-Long zhou Yuxiu Sun wei Gong Bin Wang Fuyin Ma linwei He Long chen Qiang chen He-Qi Zheng Yuanjing Cui Wen-Jie Shi Chao Zhang Mei Wang Yue-Biao Zhang Jie-peng Zhang Chongli Zhong Yong Cui Shuao Wang Jian-rong li Guodong Qian Tong-Bu Lu Huan Pang Xian-He Bu Institute for New Energy Materials and Low Carbon Technologies School of Materials Science and Engineering Tianjin University of Technology School of Chemistry and Chemical Engineering Yangzhou University School of Materials Science and Engineering Nankai University School of Physical Science and Technology ShanghaiTech University MOE Key Laboratory of Bioinorganic and Synthetic Chemistry GBRCE for Functional Molecular Engineering School of Chemistry IGCMESun Yat-sen University Department of Chemistry Shantou University School of Chemical Engineering and Technology Tiangong University School of Chemistry and Chemical Engineering Shanghai Jiao Tong University State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences Soochow University College of Materials Science & Engineering Beijing University of Technology State Key Laboratory of Silicon and Advanced Semiconductor Materials Cyrus Tang Center for Sensor Materials and ApplicationsSchool of Materials Science & Engineering Zhejiang University

As a class of functional crystalline porous materials, metal-organic frameworks(MOFs) gained rapid development in the past three decades and a large number of MOFs with ordered structures, high surface areas, and functionalized channels have been investigated. MOFs and MOF-derived/composite materials show great potential in many application fields. In this review, we discussed the main applications of MOFs and MOF-derived/composite materials in small molecule storage, separation, luminescence, sensing, multitype catalysis, and energy storage. In addition, challenges and problems in the future research of MOFsrelated fields are also discussed.

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Comparison of reduction disintegration characteristics of TiO_2-rich burdens prepared with sintering process and composite agglomeration process

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International Journal of minerals,Metallurgy and Materials 2016年第4期23卷 389-398页

作者： Zheng-wei Yu Guang-hui li chen liu Feng zhou zhi-wei peng Tao Jiang School of minerals Processing & Bioengineering Central South University

To reveal the impact of the composite agglomeration process（CAP） on the reduction disintegration properties of TiO_2-rich ironmaking burden for a blast furnace, the reduction disintegration indices（RDIs）, mineral constituents, and microstructure of the products prepared by the CAP and the traditional sintering process（TSP） were investigated. The results showed that, compared to the sinter with a basicity of 2.0 prepared by the TSP, the RDI_（＋6.3） and the RDI_（＋3.15） of the CAP product with the same basicity increased by 28.2wt% and 13.7wt%, respectively, whereas the RDI_（-0.5） decreased by 2.7wt%. The analysis of the mineral constituents and microstructure of the products indicated that the decreasing titanohematite content decreased the volume expansion during reduction. Meanwhile, the decreasing perovskite content decreased its detrimental effect on the reduction disintegration properties. In addition, the higher silicoferrite of calcium and aluminum（SFCA） content improved the strength of the CAP product. Together, these factors result in an improvement of the RDI of the CAP products. In addition, compared to the sinter, the reduced CAP products clearly contained fewer cracks, which also led to mitigation of reduction disintegration.

关键词： ore reduction titanomagnetite agglomeration sintering

Competitive adsorption of heavy metal ions on peat

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Journal of China University of mining and Technology 2008年第2期18卷 255-260页

作者： liu zhi-rong zhou li-min wei peng ZENG Kai WEN Chuan-xi LAN Hui-hua Department of Applied Chemistry East China University of Technology Fuzhou Jiangxi 344000 China Key Laboratory of Nuclear Resources and Environment Ministry of Education of China Nanchang Jiangxi 330013 China

The uptake capacities, and the adsorption kinetics, of copper, Cu（Ⅱ）, nickel, Ni（Ⅱ）, and cadmium, Cd（Ⅱ）, on peat have been studied under static conditions. The results show that the adsorption rates are rapid： equilibrium is reached in twenty minutes. The adsorption of copper, nickel and cadmium is pH dependent over the pH range from 2 to 6. The adsorption kinetics can be excellently described by the Elovich kinetic equation. The adsorption isotherm fits a Langmuir model very well. The adsorption capacities follow the order Cu^2＋〉 Ni^2＋〉 Cd^2＋ in single-component systems and the competitive adsorption capacities fall in the decreasing order Cu^2＋〉 Ni^2＋〉 Cd^2＋ in multi-component systems. The adsorption capacities of these three heavy metal ions on peat are consistent with their observed competitive adsorption capacities.

关键词： peat copper nickel cadmium competitive adsorption

Migration regularities of impurity aluminum and copper in purification of metal lanthanum by solid-state electrotransport

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Rare Metals 2021年第8期40卷 2307-2312页

作者： zhi-Qiang Wang Zong-An li Jia-min Zhong De-Hong chen xiao-wei Zhang lin zhou National Engineering Research Center for Rare Earth Materials Grirem Advanced Materials Co.Ltd.General Research Institute for Nonferrous MetalsBeijing100088China

In view of the previous studies on the migrations of impurity aluminum(Al)and copper(Cu)in purification of rare earth metal by solid-state electrotransport(SSE),there are still some questions about that which direction they migrate to and whether there are significant migrations or *** metal lanthanum(La)was used as research object,and the effects of migration temperature and time on the distributions and migration regularities of impurity Al and Cu were investigated in the present study by increasing concentration of impurity Al and Cu in raw metal *** impurity migration direction and removal difficulty were intuitively judged by the residual rate distribution curve of *** is indicated that metal impurity Al and Cu in metal La at 800℃ with direct current are found to significantly migrate to anode and their residual rates near cathode decrease with the increase in migration temperature and prolongation of migration *** relatively large vapor pressure of Al and Cu makes their residual rate distribution curves being low in middle and high in *** metal La was continuously purified for 100 h at 800℃ by SSE,the residual rates of impurity Al and Cu at 20 mm from cathode are 68.43%and 57.43%,respectively,showing that Cu is much easier to be removed than Al.

关键词： Solid-state electrotransport Purification Residual rate Rare earth metal Lanthanum

Electrode connection optimization for both temperature difference and purification of lanthanum rod during solid-state electrotransport

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Rare Metals 2023年第2期42卷 713-718页

作者： Jia-min Zhong Zong-An li xiao-wei Zhang lin zhou zhi-Qiang Wang De-Hong chen National Engineering Research Center for Rare Earth Materials Grirem Advanced Materials Co.Ltd.General Research Institute for Nonferrous MetalsBeijing100088China

In order to solve the problem of large temperature difference between the center and ends of the metallic rod in the purification process of solid-state electrotransport(SSE),three types of electrode connections of tantalum and the corresponding rods of metallic lanthanum were designed,the temperature distributions of three kinds of rod were measured,and the influence of temperature difference on the purification effect of solid-state electrotransport was *** results indicate that the maximum temperature difference of the rod will be significantly reduced through decreasing the cross section of electrode connection to make its unit length resistance close to that of rod,or increasing the unit length resistance of the section at both ends of the *** these two measures are adopted at the same time,the effect of decreasing rod temperature difference is the best in the present study,and the maximum temperature difference of the rod can be reduced to 29℃when the maximum temperature of the rod is 820℃.The migration velocity of the impurities at rod ends can be obviously improved after the rod temperature difference is reduced,which enables the purification effect and efficiency of solid-state electrotransport to be greatly raised;it is also found that the major impurities iron in metallic lanthanum migrates more easily than oxygen and carbon during the purification of metal lanthanum with solid-state electrotransport.

关键词： Solid-state electrotransport Electrode connection Temperature difference Metallic lanthanum Purification effect

A numerical local orthogonal transform method forstratified waveguides

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Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第12期11卷 998-1008页

作者： peng li wei-zhou ZHONG Guo-sheng li zhi-hua chen School of Economies and Finance Xi'an Jiaotong University Xi'an 710061 China Department of Mathematics North China University of Water Conservancy and Electric Power Zhengzhou 450045 China Department of Mathematics Zhongyuan University of Technology Zhengzhou 450007 China Science Department Zhijiang College of Zhejiang University of Technology Hangzhou 310027 China

Flattening of the interfaces is necessary in computing wave propagation along strati?ed waveguides in large range step sizes while using marching methods. When the supposition that there exists one horizontal straight line in two adjacent interfaces does not hold, the previously suggested local orthogonal transform method with an analytical formulation is not feasible. This paper presents a numerical coordinate transform and an equation transform to perform the transforms numerically for waveguides without satisfying the supposition. The boundary value problem is then reduced to an initial value problem by one-way reformulation based on the Dirichlet-to-Neumann (DtN) map. This method is applicable in solving long-range wave propagation problems in slowly varying waveguides with a multilayered medium structure.

关键词： Helmholtz equation Local orthogonal transform Dirichlet-to-Neumann (DtN) reformulation Marching method Internal interface

Plasma big endothelin-1 is an effective predictor for ventricular arrythmias and end-stage events in primary prevention implantable cardioverter-defibrillator indication patients

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Journal of Geriatric Cardiology 2020年第7期17卷 427-433页

作者： xiao-Yao li Shuang ZHAO xiao-Han FAN Ke-Ping chen wei HUA zhi-min liu xiao-Di XUE Bin zhou Shu ZHANG Arrhythmia Center State Key Laboratory of Cardiovascular DiseaseFuwai HospitalNational Center for Cardiovascular DiseasesChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina

Objective To investigate whether plasma big endothelin-1(ET-1) predicts ventricular arrythmias(VAs) and end-stage events in primary prevention implantable cardioverter-defibrillator(ICD) indication patigents. Methods In total, 207 patients fulfilling the inclusion criteria from Fuwai Hospital between January 2013 and December 2015 were retrospectively analyzed. The cohort was divided into three groups according to baseline plasma big ET-1 tertiles: tertile 1( 0.7 pmol/L, n = 70). The primary endpoints were VAs. The secondary endpoints were end-stage events comprising all-cause mortality and heart transplantation. Results During a mean follow-up period of 25.6 ± 13.9 months, 38(18.4%) VAs and 78(37.7%) end-stage events occurred. Big ET-1 was positively correlated with NYHA class(r = 0.165, P = 0.018), serum creatinine concentration(Scr;r = 0.147, P = 0.034), high-sensitivity C-reactive protein(hs-CRP;r = 0.217, P = 0.002), Lg NT-pro BNP(r = 0.463, P lic diameter(LVEDD;r = 0.234, P = 0.039) and negatively correlated with left ventricular ejection fraction(LVEF;r =-0.181, P = 0.032). Kaplan-Meier analysis showed that elevated big ET-1 was associated with increased risk of VAs and end-stage events(P litate ICD-implantation risk stratification.

关键词： Big endothelin-1 End-stage events Implantable cardioverter-defibrillator implantation Primary prevention Ventricular arrythmias

Design optimization of plastic scintillators with wavelength-shifting fibers and silicon photomultiplier readouts in the top veto tracker of the JUNO-TAO experiment

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Nuclear Science and Techniques 2023年第7期34卷 99-112页

作者： Guang Luo Y.K.Hor Pei-zhi Lu zhi-min Wang Ru-Hui li min li Yi-chen li liang Zhan wei Wang Yue-Huan wei Yu chen Xiang xiao Feng-peng An School of Physics Sun Yat-sen UniversityGuangzhou 510275China Institute of High Energy Physics Beijing 100049Chin a 3 University of Chinese Academy of Sciences Beijing 100049China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China

Plastic scintillators(PSs)embedded with wavelength-shifting fibers are widely used in high-energy particle physics,such as in muon taggers,as well as in medical physics and other *** this study,a simulation package was built to evaluate the effects of the diameter and layout of optical fibers on the light yield with different *** optimal optical configuration was designed based on simulations and validated using two PS prototypes under certain experimental condi-tions.A top veto tracker(TVT)for the JUNO-TAO experiment,comprising four layers of 160 strips of PS,was designed and *** threshold was evaluated when the muon tagging efficiency of a PS strip was>99%.The efficiency of three layer out of four layer of TVT is>99%,even with a tagging efficiency of a single strip as low as 97%,using a threshold of 10 photoelectrons and assuming a 40%silicon PM photon detection efficiency.

关键词： Plastic scintillator WLS fiber light yield Optical transmission performance Muon tagging efficiency JUNO-TAO