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Microstructure,microchemistry,and micro-magnetism of dysprosium grain boundary diffused(Nd,Ce)-Fe-B magnets

Journal of Rare Earths 2025年第3期43卷 556-568,I0005页

作者： Yifei Xiao Lele Zhang Tao Liu Qisong Sun Xiaolong Song Yikun Fang Anhua Li Minggang Zhu Wei Li Division of Functional Materials Central Iron and Steel Research InstituteBeijing 100081China Key Laboratory of Advanced Functional Materials Ministry of Education of ChinaCollege of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China

The microstructure of(Nd,Ce)-Fe-B sintered magnets with different diffusion depths was characterized by a magnetic force microscope,and the relationship between the magnetic properties and the local structure of grain boundary diffused magnets is *** domains perpendicular to the c-axis(easy magnetization direction)show a typical maze-like pattern,while those parallel to the c-axis show the characte ristics of plate *** significant gradient change is shown in the concentration of Dy with the direction of diffusion from the surface to the *** diffuses along grain boundaries and(Dy,Nd)_(2)Fe_(14)B layer with a high anisotropy field formed around the *** in-situ electron probe micro-analysis/magnetic force microscopy(EPMA/MFM),it is found that the average domain width decreases,and the proportion of single domain grains increases as diffusion depth *** is caused by both the change of concentration and distribution of *** grain boundary diffusion process changes the microstructure and microchemistry inside the magnet,and these local magnetism differences can be reflected by the configuration of the magnetic domain structure.

关键词： Magnetic microstructures (Nd,Ce)-Fe-B Rare earths Magnetic force microscope Grain boundary diffusion process(GBDP) In-situ

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Application of Unmanned Aerial Vehicle Remote Sensing on Dangerous Rock Mass Identification and Deformation Analysis:Case Study of a High-Steep Slope in an Open Pit Mine

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Journal of Earth Science 2025年第2期36卷 750-763页

作者： Wenjie Du Qian Sheng Xiaodong Fu Jian Chen Jingyu Kang Xin Pang Daochun Wan Wei Yuan State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China China-Pakistan Joint Research Center on Earth Sciences CAS-HECIslamabad 45320Pakistan Panzhihua Iron and Steel Group Mining Co. Ltd.Panzhihua 617000China Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education Shijiazhuang Tiedao UniversityShijiazhuang 050043China

Source identification and deformation analysis of disaster bodies are the main contents of high-steep slope risk assessment,the establishment of high-precision model and the quantification of the fine geometric features of the slope are the prerequisites for the above *** this study,based on the UAV remote sensing technology in acquiring refined model and quantitative parameters,a semi-automatic dangerous rock identification method based on multi-source data is *** terms of the periodicity UAV-based deformation monitoring,the monitoring accuracy is defined according to the relative accuracy of multi-temporal point *** a high-steep slope as research object,the UAV equipped with special sensors was used to obtain multi-source and multitemporal data,including high-precision DOM and multi-temporal 3D point *** geometric features of the outcrop were extracted and superimposed with DOM images to carry out semi-automatic identification of dangerous rock mass,realizes the closed-loop of identification and accuracy verification;changing detection of multi-temporal 3D point clouds was conducted to capture deformation of slope with centimeter *** results show that the multi-source data-based semiautomatic dangerous rock identification method can complement each other to improve the efficiency and accuracy of identification,and the UAV-based multi-temporal monitoring can reveal the near real-time deformation state of slopes.

关键词： high-steep slope UAV remote sensing dangerous rock identification multi-temporal monitoring multi-source data fusion engineering geology

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PDBSCAN: Parallel DBSCAN for Large-Scale Clustering Applications

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Journal of Donghua University(English Edition) 2012年第1期29卷 76-79页

作者：谢永红马延辉周芳刘颖安 School of Computer and Communication Engineering University of Science and Technology Beijing Key Laboratory for Advanced Control of Iron and Steel Process Ministry of Education University of Science and Technology Beijing

Density-based algorithm for discovering clusters in large spatial databases with noise(DBSCAN) is a classic kind of density-based spatial clustering algorithm and is widely applied in several aspects due to good performance in capturing arbitrary shapes and detecting outliers. However, in practice, datasets are always too massive to fit the serial DBSCAN. And a new parallel algorithm-Parallel DBSCAN(PDBSCAN) was proposed to solve the problem which DBSCAN faced. The proposed parallel algorithm bases on MapReduce mechanism. The usage of parallel mechanism in the algorithm focuses on region query and candidate queue processing which needed substantive computation resources. As a result, PDBSCAN is scalable for large-scale dataset clustering and is extremely suitable for applications in E-Commence, especially for recommendation.

关键词： parallel DBSCAN clustering MapReduce large-scale applications

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Burden Distribution Calculation of Bell-Less Top of Blast Furnace Based on Multi-Radar Data

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Journal of iron and steel Research International 2013年第6期20卷 33-37页

作者： ZHU Qiao L Cheng-long YIN Yi-xin CHEN Xian-zhong School of Automation and Electrical Engineering University of Science and Technology Beijing Key Laboratory of Advanced Control of Iron and Steel Process

The burden distribution real-time estimation problem of multi-loop charging based on the real multi-radar data is *** , an iterative algorithm is introduced to calculate the radial coordinate of the *** , based on the multi-radar data , the burden profile is estimated by a cubic-curve equation at the end of the multi-loop *** , the burden profile before the next multi-loop charging is calculated based on multi-radar data by considering the impact of burden *** the basis of these burden profiles , a more accurate thickness ratio of ore to coke （ RO/C ） at the radial direction of blast furnace can be *** , an example is given to calculate the burden profiles and RO/C by using the real multi-radar data sampled from Baosteel , which shows the effectiveness of the method introduced.

关键词： blast furnace multi-radar data burden distribution multi-loop charging RO/C

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Robust Attitude Decentralized Tracking control for a 3-DOF Helicopter with Unknown Input Time-delay

Robust Attitude Decentralized Tracking Control for a 3-DOF H...

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第25届中国控制与决策会议

作者： Yao Yu Chang-Yin Sun School of Automation & Electrical Engineering University of Science and Technology Beijing Key Laboratory of Advanced Control of Iron and Steel Process Ministry of Education

ISBN: (纸本)9781467355339

Robust attitude decentralized tracking control problem for a 3-DOF helicopter is investigated. The model of the 3-DOF helicopter is described as a MIMO strict-feedback form system with unknown parameters, bounded disturbances, nonlinear uncertain coupling effects and unknown input-delay. A new design method based on signal compensation technique and back-stepping strategy is proposed. Based on the signal compensation method, at each backstepping design step, a robust controller consists of a nominal controller and a robust compensator. Robust practical tracking stability condition is derived in terms of linear matrix inequalities （LMIs）. Experimental results demonstrate the effectiveness of the proposed control strategy.

关键词： Backstepping robust tracking linear decentralized controller input time-delay.

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Design of 2-D MIMO Antenna Arrays for High Resolution Burden Surface Imaging

Design of 2-D MIMO Antenna Arrays for High Resolution Burden...

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2013 IEEE 11th International Conference on Electronic Measurement & Instruments

作者： Chen Xianzhong Zhou Ping Hou Qingwen Wang Zhengpeng School of Automation & Electrical Engineering University of Science and Technology Beijing Key Laboratory of Advanced Control for Iron and Steel Process (Ministry of Education China)

ISBN: (纸本)9781479907571

In this paper, 2-D MIMO antenna arrays suitable for high resolution burden surface imaging radar operating in frequency band 24-26GHz are proposed. In order to eliminate the cross-range resolution degradation when the antenna beam radiates to the burden surface in nonperpendicular angle, MIMO antenna arrays with elliptical cross-section beam are specially designed. To suppress the high side lobe level of these designed MIMO arrays, two MIMO array sparse methods by symmetrically sparse the arrays with denser elements in the centre and sparse elements around are presented and analyzed. Patterns of the designed MIMO arrays are simulated, which verified the effectiveness of the MIMO arrays for burden surface imaging.

关键词： MIMO antenna array design, burden surface imaging, high resolution, nonperpendicular radiation, side lobe suppression.

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Improved Digital Costas Loop Design in Spread Spectrum Communication

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电子学报(英文版) 2011年第2期20卷 299-302页

作者： WANG Hongbo DENG Li MA Zhonggui TU Xuyan School of Information Engineering University of Science and Technology Beijing Beijing 100083 China Key Laboratory of Advanced Control of Iron and Steel Process （Ministry of Education） University of Science and Technology Beijing Beijing 100083 China

1 Im proved Digital Costas Loop Design in Spread Spectrum C om m UnlCat lon .WANG Hongbo,DENG Li,MA Zhonggui and TU Xuyan (School of Information Engineering,University of Science and Technology Beijing,Beijing 100083,China) (key laboratory of advanced control of iron and steel process(ministry of education),University of Science and Technology Bering,Beijing 1 00083,China) A bstract-Based on software radio technique.

关键词：扩频通信环路设计 QPSK调制解调软件无线电技术调制解调器塔设计结构数学推导 Spread spectrum communication, Digital Costas loop, Carrier recovery, Software radio.

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A pattern recognition approach to model a class of complex systems

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Journal of Computational Information Systems 2011年第13期7卷 4636-4643页

作者： Xu, Zhengguang Wu, Jinxia Wang, Yongmao School of Automation University of Science and Technology Beijing Beijing 100083 China Key Laboratory of the Ministry of Education for Advanced Control of Iron and Steel Process University of Science and Technology Beijing Beijing 100083 China

This paper details a novel approach for describing dynamics of complex systems by pattern recognition techniques. It is a new statistical modeling method to solve the problems that some production processes can not be described precisely. Different from traditional pattern recognition method, moving pattern is presented to describe the dynamics directly. Based on the actual running status data, pattern moving space is constructed and a moving variable-pattern class variable is defined to reflect the moving of pattern. The prediction model is also designed based on pattern class variable. Simulation results are presented to support the theoretical development for a class of production process systems. © 2011 Binary Information Press December, 2011.

关键词： Information systems

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Disturbance Rejection in Hydraulic Automation Position control System for Rolling Mills

Disturbance Rejection in Hydraulic Automation Position Contr...

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第三十二届中国控制会议

作者： WANG Lijun LI Qing TONG Chaonan YIN Yixin GAO Zhiqiang ZHENG Qinling School of Automation & Electrical Engineering University of Science and Technology Beijing Key Laboratory of Advanced Control of Iron and Steel Process(Ministry of Education) Center for Advanced Control Technologies Cleveland State University

ISBN: (纸本)9781479900305

The hydraulic automation position control(HAPC) system for rolling mills is always difficult to design with high accuracy due to the uncertainties and other external *** a linear,low-order and optimization parameters, the high-order uncertain dynamics and unknown disturbances in plant dynamics is estimated by extended state observer(ESO). The resulting active disturbance rejection control(ADRC) is simple to use,easy to *** results show that the proposed ADRC has better robustness and adaptability than PID.

关键词： Disturbance rejection Uncertainty Extended state observer Hydraulic automation position control

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Effect of Microstructure Scale on Negative Thermal Expansion of Antiperovskite Manganese Nitride

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Journal of Materials Science & Technology 2014年第9期30卷 903-909页

作者： Zhonghua Sun Xiaoyan Song College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsEducation Ministry of China Beijing University of Technology Hebei Iron and Steel Technology Research Institute

The negative thermal expansion （NTE） properties of the antiperovskite manganese nitrides with micron-scale, submicron-scale and nanometer-scale microstructures, respectively, were investigated using the Mn3Cu0.5Ge0.5N composition as an example. It was discovered that the NTE start temperature, NTE operation temperature range and coefficient of NTE change obviously in a wide range with decreasing the grain size level of the microstructure. The mechanisms for the broadening of the NTE operation temperature range and the decrease in the absolute value of NTE coefficient were proposed based on the grain-size-dependence of the frustrated magnetic interactions and magnetic ordering. The present study indicates that the NTE properties of the antiperovskite manganese nitrides can be tailored by the control of the microstructure scale.

关键词： Negative thermal expansion Antiperovskite manganese nitride Magnetic interaction Microstructure scale

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