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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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Facile synthesis of the dodecahydridododecaborate (B12H122-) from borane Lewis base adducts

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Science China Chemistry 2025年

作者： Yi Jing Xin-Ran liu Xing-Hua Wang Hui Han Sha-Sha Liang Xi-Meng Chen Dong-Hui wei Lai-Sheng Wang Xue-Nian Chen College of Chemistry Zhengzhou University School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced MaterialsHenan Normal University Department of Chemistry Brown University

Polyhedral boranes are a class of well-known boron molecular clusters widely used in energy,chemistry,medicine,and materials science because of their unique physical and chemical *** efforts have been made in the past decades to find more effective synthetic methods for this important class of boron ***,existing synthetic methods suffer from low efficiency and low ***,we report a facile one-pot synthesis of[（CH3）3S]2B12H12with moderate yields at mild *** mechanisms for the multi-step chemoselective synthesis of B12H122-without other by-products are elucidated based on theoretical results and our previous *** Lewis base used in B–H bond condensation reaction,which acts as a hydrogen or to balance the newly generated polyhedral borane charges,is proposed and studied in *** current study has led to a more effective and selective synthetic method for B12H122-and has also implicated the syntheses of other new polyhedral boranes.

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AN EXPERIMENTAL STUDY ON EFFECTS OF THE BETA TOPOGRAPHY ON SURFACE FLOWS IN A ROTATING ANNULUS SUBJECT TO RAdiAL TEMPERATURE GRAdiENT

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Journal of Hydrodynamics 2005年第5期17卷 558-563页

作者： LIN Shang-jin wei Gang liu Li-long liu Yu-di School of Science PLA University of Science and Technology Nanjing 211101 China School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai 200030 China

Beta effects on surface flows in a rotating annulus with a radial temperature gradient and a sloping bottom were studied experimentally. An azimuthal jet was produced by the action of the Coriolis force in the convective region between the two side walls of the annulus. Propagating velocity and patterns of the baroclinic wave on the surface were obrained by using a frequency-meter and a streak photograph respectively. It is shown that there exists the nonlinear interaction between the baroelinic and beta effects. The beta effect exerts little influence on the stratification flows and constrains the baroclinic instability, and it prompts the instability of the weak stratification flows and results in the surface pattern of waves with higher frequency. It is also indicated that the beta effect can reduce the propagating speed of the surface waves in the jet, and increase the thermal Rossby number for those same surface patterns under a given Taylor number.

关键词： rotating annulus baroclinic wave beta effect instability stratification

Interfacial strengthening and antibacterial behavior in an ultrafine-graine d Zn-Ag-base d biocomposites fabricated by the Cu_(2)O-induced in situ wetting approach

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Journal of Materials Science & Technology 2023年第21期152卷 109-134页

作者： Xiao Wang Tongxin di wei Li Debao liu Xiaohao Sun School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China School of Chemistry and Chemical Engineering Tianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Function Materials Education Tianjin University of TechnologyTianjin 300384China Tianjin Key Laboratory for Photoelectric Materials and Devices Tianjin 300384China

Nowadays,Zinc(Zn)-based biocomposites as biodegradable implant materials have been recognized as a promising approach to overcome the insufficient mechanical performance of Zn matrix and to endow the Zn-based materials with ***,the strengthening effect on Zn-based matrix compos-ite remains far from expectation mainly due to the poor interfacial bonding between the reinforcement and Zn matrix,and the relatively coarse grain size of the Zn ***,we have developed a novel in situ wetting strategy to ameliorate the interfacial bonding and mechanical performance of Zn-Ag-based composites using cuprous oxide-modified graphene oxide(Cu_(2)O-GO)sheets as *** en-hanced interfacial bonding between GO sheets and Zn matrix owing to the in situ generated ZnO inter-layer and the ultrafine microstructure with an average grain size of 360 nm were simultaneously achieved in the hot extruded(HEed)1 wt%Cu_(2)O-GO/Zn-2 wt%Ag ***,HEed biocompos-ites possessed excellent tensile properties,including ultimate tensile strength(UTS)of 344.0±2.4 MPa,yield stress(YS)of 314.0±4.8 MPa,and elongation at failure of 15.5%±1.3%.Ultrafine and uniform microstructure of the HEed biocomposites resulted in a relatively uniform corrosion morphology and a degradation rate of 0.195±0.004 mm y^(−1) in simulated body fluid(SBF)*** 2-fold diluted extract of the HEed biocomposites exhibited satisfying cytocompatibility with MC3T3-E1 pre-osteoblast comparable to that of Ti-6Al-4 V ELI *** importantly,the synergistic effect of metallic ions,Ag-rich nanoparticles,and GO sheets contributed to the remarkable antibacterial activity of the experimental biocomposites against both *** and *** results demonstrated that the 1Cu_(2)O-GO/Zn-2Ag biocomposites should be anticipated as a promising biodegradable material for orthopedic applications.

关键词： Zn-based composite In situ reaction Ultrafine microstructure Inerfacial bonding Antibacterial behavior

Design strategy and comprehensive performance assessment towards Zn anode for alkaline rechargeable batteries

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Journal of Energy Chemistry 2023年第7期82卷 122-138,I0004页

作者： di Yang Jinsheng Li Changpeng liu wei Xing Jianbing Zhu State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022JilinChina School of Applied Chemistry and Engineering University of Science and Technology of Chin1 Hefei 230026AnhuiChina

Alkaline Zn-based primary batteries have been commercialized in the past ***,their success has not been extended to secondary batteries due to the poor cycle reversibility of Zn *** some research has been conducted on alkaline Zn anodes,their performance is still far from commercial requirements.A variety of degradation mechanisms,including passivation,dendrites,morphological changes,and hydrogen precipitation,are claimed responsible for the failure of alkaline Zn metal ***’s worse,these constraints always interact with each other,which leads to a single strategy being unable to suppress all the ***,a comprehensive evaluation of the positive and negative effects of various strategies on performance is important to promote the commercialization of alkaline Zn ***,the recent progress and performance of improvement strategies for Zn anode in alkaline conditions are reviewed ***,the principles and challenges of alkaline Zn anodes are briefly ***,various design strategies for alkaline Zn anodes from the perspectives of ion and electron regulation are ***,through a comprehensive summary of various performance parameters,the advantages and disadvantages of different strategies are compared and *** the basis of this assessment,we aim to provide more insights into the anode design of high-performance alkaline rechargeable Zn batteries.

关键词： Alkaline aqueous batteries Zinc anode Regulation strategies Performance assessment

Escobar-Lichnerowicz-Reilly type eigenvalue estimate for the weighted p-Laplacian on manifolds with integral Ricci curvature

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Acta Mathematica Sinica,English Series 2025年

作者： Yong Tao liu School of Mathematics and Statistics Ningxia University

Under the assumption of integral m-Bakry-émery Ricci curvature, we give an Escobar-LichnerowiczReilly type eigenvalue estimate for the weighted p-Laplacian on compact smooth metric measure spaces with or without boundaries. This conclusion is a generalization and improvement of Wang-Li’s result in the case of integral Bakry-émery Ricci curvature, and of Seto-wei’s one to the compact metric measure space setting. Our main tools are the weighted p-Bochner formula and the weighted p-Reilly formula.

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Air concentration distribution in the impact zone of spillway aerator

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Journal of Hydrodynamics 2022年第1期34卷 156-161页

作者： Rui-di Bai Fa-xing Zhang wei Wang Shan-jun liu State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu610065China

The chute aerators separate the flow from the chute bottom,and the violent turbulence is generated after the flow impacts the *** the chute aerators were widely investigated experimentally,the air concentration distribution of the lower jet in the impact zone remains to be explored *** the impact zone,it is observed that a portion of the air stays in the rollers instead of traveling with the flow,decreasing the air transportation *** on extensive tests,a comprehensive formula is developed to compute the air concentration distribution in the impact zone,with results in good agreement with the model tests.

关键词： Chute aerator impact zone air concentration cavity length experimental data

中国蓝藻新记录种--纤细双色藻(Cyanobium gracile)

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湖泊科学 2025年第1期37卷 229-237页

作者：刘洋委雅菲李效宇张榜军河南省水生态毒理与健康防护国际联合实验室新乡453007 河南师范大学生命科学学院新乡453007 河南省丹江口水库水域生态系统野外科学观测研究站南阳474450

随着基因测序技术的发展,环境中一些微藻不断被发现,超微蓝藻便是其中之一,但关于超微蓝藻的多相分类学研究在我国报道较少。本研究首次在某自来水厂分离纯化获得了一株超微蓝藻藻株Cyanobium gracile HNU001,并对其形态学、超微结构和... 详细信息

随着基因测序技术的发展,环境中一些微藻不断被发现,超微蓝藻便是其中之一,但关于超微蓝藻的多相分类学研究在我国报道较少。本研究首次在某自来水厂分离纯化获得了一株超微蓝藻藻株Cyanobium gracile HNU001,并对其形态学、超微结构和分子特征进行了研究。形态学研究发现,其藻细胞呈椭圆形或椭球形,在分裂过程中平行于短的细胞轴对称存在;超微结构显示了细胞二分裂繁殖以及类囊体膜平行于细胞膜排列;16S rRNA基因序列显示,该藻株与双色藻属Cyanobium的序列相似性大于99.9%,分子系统树聚为一束;该藻株与Cyanobium gracile PCC 6307的D1-D1′、Box-B螺旋结构一致。综合以上结果,将其命名为纤细双色藻(Cyanobium gracile),是在我国的首次报道。

关键词：蓝藻超微蓝藻双色藻分类分子系统

融合注意力与自适应加权特征金字塔的铝型材缺陷检测

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光电子·激光 2025年第1期36卷 53-60页

作者：赵伟刘国华天津工业大学机械工程学院天津市现代机电装备技术重点实验室

本文提出了一种新的铝型材缺陷检测方法，以解决现有方法在精度和小目标缺陷检测方面存在的问题。首先在特征提取网络中引入坐标注意力机制(coordinate attention, CA),以防止信息丢失，从而避免缺陷漏检。其次，引入自适应加权特征金字... 详细信息

本文提出了一种新的铝型材缺陷检测方法，以解决现有方法在精度和小目标缺陷检测方面存在的问题。首先在特征提取网络中引入坐标注意力机制(coordinate attention, CA),以防止信息丢失，从而避免缺陷漏检。其次，引入自适应加权特征金字塔(adaptive weighted feature pyramid, AWFPN),优化特征图的感受野和注意力融合，从而提升缺陷特征的捕获和利用效率。同时，改进了边界框回归损失函数，更好地处理缺陷尺度变化和定位误差，从而在提高检测精度的同时加快了模型的收敛速度。实验结果显示，该方法在提升检测效果方面取得显著进展，尤其在脏点和划痕等缺陷的识别能力上有明显提升。

关键词：铝型材缺陷检测注意力机制深度学习 YOLOv5