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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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Energy exchange process among multiple filamentary femtosecond laser beams in air

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Science China(Physics,Mechanics & Astronomy) 2016年第3期59卷 105-106页

作者： jing Jie Ding Peng Ji Ding Zuo Ye Liu bi tao Hu School of Nuclear Science and Technology Lanzhou University

Dear Editors,Energy exchange between two filamentary pulses was demonstrated in several experiments [ 1-4], and the energy- transfer direction depends on the time delay between filamen- tary pulses, the initial chirp, the laser intensities, the location, the crossing angle and the relative polarization. However, the understanding of the physical mechanisms of energy ex- change in literatures are different and puzzling, including the impulsive Raman nonlinear response of the molecules [1], the plasma-mediated forward stimulated Raman scattering [2], the traveling plasma grating [3], and the classical two beam coupling model [4].

关键词：能量交换双光束飞秒激光交换过程受激拉曼散射空气丝状等离子体

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Exploration of Multiple Access Interference Suppression Based on Multi-user Detection

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Chinese Journal of Electronics 2019年第4期28卷 835-840页

作者： WU tao jing Xiaojun Beijing University of Posts and Telecommunications

A multi-user detection algorithm for multiple access interference suppression combined with the minimum mean squared error and an artificial fish swarm algorithm is proposed. By taking advantage of the artificial fish swarm algorithm, the proposed algorithm can quickly converge to the optimal solution. The variation in the minimum mean squared error based test results is assigned to the artificial fish swarm algorithm, which is regarded as the initial state of artificial fish. The simulation results show that the proposed algorithm has a better multi-user capacity performance and lower bit-error rate than the minimum mean squared error detector.

关键词： Multiple access interference suppression Minimum mean squared error Artificial fish swarm algorithm Multi-user detection algorithm Code division multiple access

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基于卡尔加里-剑桥指南的沙龙培训模式提升全科规培医师医患沟通技能的对照研究

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中国全科医学 2025年第1期28卷 71-76页

作者：彭涛邹川曾欣张焱沈静四川省成都市第五人民医院全科医学科 611130

背景医患沟通技能是全科医生的核心岗位胜任力之一,高水平的医患沟通能力是创建和谐医患关系的基石,有助于提高患者就医获得感和满意度。而我国全科医生沟通能力普遍偏低,有待探索出一种适应我国国情、满足我国全科医生沟通需求的医患... 详细信息

背景医患沟通技能是全科医生的核心岗位胜任力之一,高水平的医患沟通能力是创建和谐医患关系的基石,有助于提高患者就医获得感和满意度。而我国全科医生沟通能力普遍偏低,有待探索出一种适应我国国情、满足我国全科医生沟通需求的医患沟通培训模式来提高其医患沟通能力。目的探索基于卡尔加里-剑桥指南的沙龙培训模式在全科规培医师医患沟通技能培训中的应用效果,为构建适合我国国情的医患沟通培训体系提供参考依据。方法选取成都市第五人民医院2019—2020年度全科规培医师40名作为研究对象,按照随机数字表法分为沙龙组和对照组,每组20名,其中沙龙组使用基于卡尔加里-剑桥指南的沙龙培训模式进行医患沟通培训,对照组设置为空白对照,培训前、培训后1周分别对两组学员采用标准化病人(SP)模式进行接诊,使用医患沟通评价量表(SEGUE量表)进行现场观察评分,比较两组学员的医患沟通培训效果。结果最终纳入28名,其中沙龙组15名,对照组13名,培训后沙龙组规培医师SEGUE量表评分从(11.80±4.36)分提高至(18.07±4.11)分,对照组规培医师SEGUE量表评分从(12.15±4.63)分提高至(14.46±3.71)分。沙龙组培训后的SEGUE量表评分与培训前的比较,差异有统计学意义(t=3.250,P<0.001);对照组培训后的SEGUE量表评分与培训前比较,差异无统计学意义(t=2.582,P=0.624);培训后对SEGUE量表中的25个项目进行分析,沙龙组与对照组SEGUE量表评分比较,差异有统计学意义(P<0.05)。沙龙组以下5个项目结果优于对照组,准备阶段中的“建立个人信任关系”(93.3%比7.7%)、“保护患者的隐私/尊重患者选择权”(53.3%比15.4%);理解患者阶段中的“认同患者为疾病所付出的努力、改变及其遇到的困难”(33.3%比23.1%)、“表达关心,使患者感到温暖/树立信心”(100.0%比69.2%);结束问诊阶段中的“询问患者是否还有其他的问题需要探讨”(66.7%比23.1%)。结论基于卡尔加里-剑桥指南的沙龙培训模式对全科规培医师进行医患沟通技能培训可增强学员主动参加培训的兴趣和积极性,对于医患沟通能力的提升具有较好的培训效果,值得借鉴和推广。

关键词：全科医学全科医师规范化培训医患沟通沟通培训卡尔加里-剑桥指南

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Microwave dielectric properties and microstructure of a new kind Eu-based Eu(Mg_(0.5)Ti_(0.5))O_3 ceramic

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Rare Metals 2018年第11期37卷 913-918页

作者： tao Shi jing Zhu National Center for Electron Microscopy in Beijing Tsinghua University School of Materials Science and Engineering Tsinghua University The State Key Laboratory of New Ceramics and Fine Processing Tsinghua University Laboratory of Advanced Materials Tsinghua University

A new Eu-based microwave dielectric ceramic,Eu(MgTi)O(EMT for short), was prepared through conventional solid-state reactions. The EMT ceramics were well densified at 1425 ℃ and exhibit good microwave dielectric properties with permittivity of 23.92, high quality factor(Q*f) of 66,957 GHz at 8.93 GHz and relatively low-temperature coefficient of resonant frequency of-20.3 10/K. Additionally, the variations of dielectric constants among Ln(MgTi)O(Ln represents rare earth elements, LMT) compounds were analyzed. Ionic radii of Ln, associated with the tolerance factors of the perovskite structure of LMT, were investigated to be the key factor to influence the permittivity. These results indicate that EMT ceramics might be one of the promising candidates as microwave resonators.

关键词： Microwave dielectrics Eu(Mg_(0.5)Ti_(0.5))O_3 Complex perovskite Solid-state reactions

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Preparation and characterization of HMX/EVA/hBNNSs microcomposites with improved thermal stability and reduced sensitivity

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Defence Technology（防务技术） 2021年第2期17卷 650-656页

作者： Yue Yang Xiao-dong Li Yan-tao Sun Jian-an Tian Hui-min Liu bi-dong Wu jing-yu Wang School of Environment and Safety Engineering North University of ChinaTaiyuan030051ShanxiChina Shanxi Engineering Technology Research Center for Ultrafine Powder North University of ChinaTaiyuan030051ShanxiChina

Hexagonal boron nitride nanosheets(HBNNSs)have huge potential in the field of coating materials owing to their remarkable chemical stability,mechanical strength and thermal ***-layer hBNNSs were obtained by a liquid-phase exfoliation of h-BN powders and incorporated into EVA coatings for improving the safety performance of 1,3,5,7-tetranitro-1,3,5,7-tetrazocane(HMX).HBNNSs and ethylene-vinyl acetate copolymer(EVA)were introduced to HMX by a solvent-slurry *** comparison,the HMX/EVA and HMX/EVA/graphene(HMX/EVA/G)composites were also prepared by a similar *** morphology,crystal form,surface element distribution,thermal decomposition property and impact sensitivity of HMX/EVA/hBNNSs composites were contrastively *** showed that as prepared HMX/EVA/hBNNSs composites were well coated with hBNNSs and EVA,and exhibited better thermal stability and lower impact sensitivity than that of HMX/EVA and HMX/EVA/G composites,suggesting superior performance of desensitization of hBNNSs in explosives.

关键词： Energetic materials 2D(two dimensional)materials HBNNSs(hexagonal boron nitride nanosheets) HMX(1,3,5,7-Tetranitro-1,3,5,7-tetrazocane) Thermal stability Mechanical sensitivity

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Methods for Detection of Subsurface Damage:A Review

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Chinese Journal of Mechanical Engineering 2018年第3期31卷 23-36页

作者： jing-fei Yin Qian Bai bi Zhang Key Laboratory for Precision and Non-traditional Machining of Ministry of Education Dalian University of Technology Department of Mechanical and Energy Engineering South University of Science and Technology

Subsurface damage is easily induced in machining of hard and brittle materials because of their particular mechani?cal and physical properties. It is detrimental to the strength,performance and lifetime of a machined part. To manu?facture a high quality part,it is necessary to detect and remove the machining induced subsurface damage by the subsequent processes. However,subsurface damage is often covered with a smearing layer generated in a machining process,it is rather di cult to directly observe and detect by optical microscopy. An e cient detection of subsur?face damage directly leads to quality improvement and time saving for machining of hard and brittle materials. This paper presents a review of the methods for detection of subsurface damage,both destructive and non?destructive. Although more reliable,destructive methods are typically time?consuming and confined to local damage infor?mation. Non?destructive methods usually su er from uncertainty factors,but may provide global information on subsurface damage distribution. These methods are promising because they can provide a capacity of rapid scan and detection of subsurface damage in spatial distribution.

关键词： Subsurface damage Hard and brittle material Taper polishing Measurement Laser scattering

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Allocation and Scheduling of Network Resource for Multiple Control Applications in SDN

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China Communications 2015年第6期12卷 85-95页

作者： FENG tao bi Jun WANG Ke Institute for Network Sciences and Cyberspace Tsinghua University Department of Computer Science and Technology Tsinghua University Tsinghua National Laboratory for Information Science and Technology Department of Electronic Engineering Tsinghua University

The network resource allocation in SDN for control applications is becoming a key problem in the near future because of the conflict between the need of the flow-level flexibility control and the limited capacity of flow *** on the analysis of the difference of the definition of network resource between SDN and traditional IP network,the idea of the integrated allocation of link bandwidth and flow table for multiple control applications in SDN is proposed in this ***,a price-based joint allocation model of network resource in SDN is built by introducing the price for each of the resources,which can get the proportional fair allocation of link bandwidth and the minimum global delay at the same *** have also designed a popular flow scheduling policy based on the proportional fair allocation of link bandwidth in order to achieve the minimum global delay.A flow scheduling module has been implemented and evaluated in Floodlight,named virtual forwarding space(VFS).VFS can not only implement the fair allocation of link bandwidth and minimum delay flow scheduling in data plane but also accelerate packet forwarding by looking up control rules in control plane.

关键词： resource allocation SDN multi-ple applications

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Tangling and instability effect analysis of initial in-plane/out-of-plane angles on electrodynamic tether deployment under gravity gradient

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Chinese Journal of Aeronautics 2021年第1期34卷 1-9页

作者： jing CUI tao SHEN tao WEI Zhongyi CHU School of Mechanical Engineering and Applied Electronics Beijing University of TechnologyBeijing 100124China School of Instrumental Science ami Opto-electronics Engineering Beihang UniversityBeijing 100191China Shenzhen Polytechnic Shenzhen 518055China

The space debris occupies the orbit resources greatly,which seriously threats the safety of spacecraft for its high risks of *** theories about space debris removal have been put forward in recent *** Electro Dynamic Tether(EDT),which can be deployed under gravity gradient,is considered to be an effective method to remove debris in low orbit for its low power ***,in order to generate sufficient Lorentz force,the EDT needs to be deployed to several kilometers,which increases the risks of tangling and the instability of the EDT *** the deployment process,different initial in-plane/out-of-plane angles,caused by direction error at initial release or the initial selection of ejection,affect the motion of EDT system *** order to solve these problems,firstly,this paper establishes the dynamic model of the EDT ***,based on the model,safety metrics of avoiding tangling and assessing system stability during EDT deployment stage are designed to quantitatively evaluate the EDT system ***,several numerical simulations are established to determine the safety ranges of the initial in-plane/out-of-plane angles on the EDT deployment.

关键词： Assembly the electrodynamics tether system Electrodynamics tether deployment In-plane/out-of-plane angles Tangling risks

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Experimental and numerical study on dynamic mechanical behaviors of shale under true triaxial compression at high strain rate

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International Journal of Mining Science and Technology 2024年第2期34卷 149-165页

作者： Xiaoping Zhou Linyuan Han jing bi Yundong Shou School of Civil Engineering Wuhan UniversityWuhan 430072China College of Civil Engineering Guizhou UniversityGuiyang 550025China

High-energy gas fracturing of shale is a novel,high efficacy and eco-friendly mining technique,which is a typical dynamic perturbing *** effectively extract shale gas,it is important to understand the dynamic mechanical properties of *** experiments on shale subjected to true triaxial compression at different strain rates are first conducted in this *** dynamic stress-strain curves,peak strain,peak stress and failure modes of shale are *** results of the study indicate that the intermediate principal stress and the minor principal stress have the significant influence on the dynamic mechanical behaviors,although this effect decreases as the strain rate *** characteristics of compression-shear failure primarily occur in shale subjected to triaxial compression at high strain rates,which distinguishes it from the fragmentation characteristics observed in shale under dynamic uniaxial ***,a numerical three-dimensional Split Hopkinson Pressure Bar(3D-SHPB),which is established by coupling PFC3D and FLAC3D methods,is validated to replicate the laboratory characteristics of *** dynamic mechanical characteristics of shale subjected to different confining stresses are systematically investigated by the coupling PFC3D and FLAC3D *** numerical results are in good agreement with the experimental data.

关键词： Dynamic behaviors True triaxial compression High strain rates Dynamic failure mechanism PFC3D-FLAC3D coupled method

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