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Theoretical characterization of the temperature-dependent saturation magnetization of magnetic metallic materials

Chinese Physics B 2024年第7期33卷 577-585页

作者：吴金龙董攀贺屹马艳丽李梓源姚沁远邱俊麻建坐李卫国 State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China College of Aerospace Engineering Chongqing UniversityChongqing 400044China College of Intelligent Systems Science and Engineering Hubei Minzu UniversityEnshi 445000China College of Mechanical Engineering and Automation Chongqing Industry Polytechnic CollegChongqing 401120China

Based on the force-heat equivalence energy density principle,a theoretical model for magnetic metallic materials is developed,which characterizes the temperature-dependent magnetic anisotropy energy by considering the equivalent relationship between magnetic anisotropy energy and heat energy;then the relationship between the magnetic anisotropy constant and saturation magnetization is ***,we formulate a temperature-dependent model for saturation magnetization,revealing the inherent relationship between temperature and saturation *** model predicts the saturation magnetization for nine different magnetic metallic materials at different temperatures,exhibiting satisfactory agreement with experimental ***,the experimental data used as reference points are at or near room *** to other phenomenological theoretical models,this model is considerably more accessible than the data required at 0 *** index included in our model is set to a constant value,which is equal to 10/3 for materials other than Fe,Co,and *** transition metals(Fe,Co,and Ni in this paper),the index is 6 in the range of 0 K to 0.65T_(cr)(T_(cr) is the critical temperature),and 3 in the range of 0.65T_(cr) to T_(cr),unlike other models where the adjustable parameters vary according to each *** addition,our model provides a new way to design and evaluate magnetic metallic materials with superior magnetic properties over a wide range of temperatures.

关键词： magnetic metallic materials temperature dependent saturation magnetization modeling

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Investigation on full distribution CNC system based on SERCOS bus

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Journal of Systems Engineering and Electronics 2008年第1期19卷 52-57页

作者： guo wei Chen Zongyu li Congxin National Die & Mould CAD Engineering Research Center Shanghai Jiaotong Univ. Shanghai 200030 P. R. China

A full distribution CNC system based on SERCOS bus is studied in accordance with the limitations of traditional PC-based motion card. The conventional PC-based motion control card is dispersed into several autonomous intelligent servo-control units with the function of servo driver. The autonomous intelligent servocontrol units realize the loop control of position, velocity and current. Interpolation computation is completed in PC and the computational results are transferred to every autonomous intelligent servo-control unit by high speed SERCOS bus. Software or hardware synchronization technology is used to ensure all servomotors are successive and synchronously running. The communication and synchronization technology of SERCOS are also researched and the autonomous intelligent servo-control card is developed byself. Finally, the experiment of circle contour process on a prototype system proves the feasibility.

关键词： offline interpolation full distribution CNC autonomous intelligent servo-control unit SERCOS bus communication and synchronization.

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Electrochemical behavior of different shelled microcapsule composite copper coatings

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International Journal of Minerals,Metallurgy and Materials 2011年第3期18卷 377-384页

作者： Xiu-qing Xu Yan-hong guo wei-ping li li-qun Zhu School of Materials Science and Engineering Beihang University Beijing 100191 China

Copper/liquid microcapsule composite coatings with polyvinyl alcohol （PVA）, gelatin or methyl cellulose （MC） as shell materials were prepared by electrodeposition. The influence of shell materials on the corrosion resistance of the composite coatings in 0.1 M H2SO4 was investigated by means of electrochemical techniques, scanning electron microscopy （SEM）, and energy dispersion spectrometry （EDS）. The results show that the participation of microcapsules can enhance the corrosion resistance of the composite coatings compared with the traditional copper layer. Based on the analysis of electrochemical test results, the release ways of microcapsules were deduced. Gelatin and MC as the shell materials of microcapsules are easy to release quickly in the composite coating. On the contrary, the releasing speed of PVA microcapsules is relatively slow due to their characteristics.

关键词： composite coatings shell materials copper microcapsules electrochemical properties corrosion resistance electrodeposition

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CIRCpedia v2: An Updated Database for Comprehensive Circular RNA Annotation and Expression Comparison

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Genomics, Proteomics & Bioinformatics 2018年第4期16卷 226-233页

作者： Rui Dong Xu-Kai Ma guo-wei li li Yang CAS Key Laboratory of Computational Biology CAS-MPG Partner Institute for Computational Biology Shanghai Institute of Nutrition and Health Shanghai Institutes for Biological Sciences University of Chinese Academy of Sciences Chinese Academy of Sciences School of life Science and Technology ShanghaiTech University

Circular RNAs （circRNAs） from back-splicing of exon（s） have been recently identified to be broadly expressed in eukaryotes, in tissue-and species-specific manners. Although functions of most circRNAs remain elusive, some circRNAs are shown to be functional in gene expression regulation and potentially relate to diseases. Due to their stability, circRNAs can also be used as biomarkers for diagnosis. Profiling circRNAs by integrating their expression among different samples thus provides molecular basis for further functional study of circRNAs and their potential application in clinic. Here, we report CIRCpedia v2, an updated database for comprehensive circRNA annotation from over 180 RNA-seq datasets across six different species. This atlas allows users to search, browse, and download circRNAs with expression features in various cell types/tissues, including disease samples. In addition, the updated database incorporates conservation analysis of circRNAs between humans and mice. Finally, the web interface also contains computational tools to compare circRNA expression among samples. CIRCpedia v2 is accessible at http：//***/rnomics/circpedia.

关键词： Circular RNACircRNA Back-splicing Database CIR Cpedia

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Analysis of Electronic Structures for SmCo5 Compound

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Journal of Rare Earths 2004年第Z1期22卷 103-106页

作者： Zhang Changwen li Hua guo Yongquan li wei Dong Jianmin School of physics and Microelectronics Shandong University Jinan 250100 China School of physics and Microelectronics Shandong University Jinan 250100 China Institute of Functional Materials Central Iron &Steel Research Institute Beijing 100081 China Institute of Functional Materials Central Iron &Steel Research Institute Beijing 100081 China School of physics and Microelectronics Shandong University Jinan 250100 China

The spin-polarized MS-Xα method is employed to study the electronic structure and the magnetic property of the SmCo5 *** to the calculated results, the magnetic moment per Sm is 1.29μB in the SmCo5 compound, which agrees with that of *** analyzed result reveals that some negative exchange couplings occurring at six energy levels induce the distinct decrease of Curie temperature and the magnetic moment per *** valence electron numbers of 2.48, which are derived from the orbital hybridization from s, p, d and f functions between Sm and Co atoms, are transferred to Sm(5d0) ***, the exchange interactions between 3d ～ 5d electrons lead to the magnetic coupling between Sm and Co, which results in the long-range ferromagnetic-order inside the SmCo5 compound.

关键词： electronic structure atomic magnetic moment exchange coupling Curie temperature

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Highly efficient Knoevenagel condensation reactions catalyzed by a proline-functionalized polyacrylonitrile fiber

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Chinese Chemical Letters 2013年第1期24卷 52-54页

作者： guo-wei li Jia Xiao Wen-Qin Zhang Department of Chemistry School of SciencesTianjin University

A new proline-functionalized fiber catalyst was employed for the first time to catalyze the Knoevenagel condensation reactions between aromatic aldehydes and ethyl cyanoacetate or malononitrile. This fiber catalyst exhibits a high efficiency （0.5-2 tool% of catalyst with yields of 90%-99%） and excellent reusability （up to 20 times） without the need for additional treatments.

关键词： Polyacrylonitrile fiberProlineSupported catalystsKnoevenagel condensation reaction

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Effects of overburden, rock strength and pillar width on the safety of a three-parallel-hole tunnel

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第11期10卷 1581-1588页

作者： Shong-loong CHEN guo-wei li Meen-wah GUI Department of Civil Engineering National Taipei University of Technology Taipei Department of Civil Engineering National Chiao-Tung University Hsinchu

During the excavation of three-parallel-hole tunnel, the tunnel might collapse due to over-stress as a result of inadequate rock pillar width. Treating the rock overburden depth, rock strength, and rock pillar width as variables, a series of 3D numerical analysis was carried out to examine the effect of each variable on the safety of the tunnel, in particular the rock pillar. A stress strength ratio (SSR) was used to define whether the safety of the rock pillar was exceeded. A simple design chart for the case of three-parallel-hole tunnel, which took into account the influence of overburden depth, rock pillar width, and rock strength, was also proposed for used in the preliminary design stage.

关键词： Three-parallel-hole tunnel Tunnels interaction Rock pillar Numerical analysis Stress strength ratio (SSR)

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Cooling Rate Sensitivity of RE-Containing Grain Refiner and Its Impact on the Microstructure and Mechanical Properties of A356 Alloy

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Acta Metallurgica Sinica(English Letters) 2016年第5期29卷 414-421页

作者： Hua-Rui Zhang Zhen-Bang liu Zi-Zhuo li guo-wei li Hu Zhang School of Materials Science and Engineering BeihangUniversityBeijing 100191China Beijing Key Laboratory for Advanced Functional Materialand Thin Film Technology Beihang UniversityBeijing 100191China SMX Dicastal Wheel Manufacture Company Sanmenxia 472000China

The cooling rate sensitivities of A1TiB, RE and A1TiB-RE refiners were investigated using laboratory experiments and the actual industrial applications of A356 automotive wheel via low pressure die casting technology. Their impact mechanisms on the microstructure and mechanical properties of the A356 alloy were discussed. The results demonstrated that the AITiB-RE refiner possessed most effective and synergetic refinement effects compared to the individual A1TiB or RE refiners. The A1TiB-RE refiner exhibited the least sensitivity to the cooling rate changes than the other refiners. The comprehensive properties of alloy wheel refined by the A1TiB-RE refiner were improved significantly. The tensile strength, yield strength, and elongation of wheel spoke improved by approximately 11.3%, 10.8% and 44.1%, respectively. The property difference values of the tensile strength, yield strength, and elongation in different positions of the wheel decreased from 14.8%, 31.2% and 47.7% to 8.6%, 27.1% and 30.9%, respectively.

关键词： Grain refinement Cooling rate sensitivity A356 alloy Microstructure Mechanicalproperties

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Design of intelligent detecting system based on wireless transmission

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第3期8卷 490-494页

作者： guo li-wei liU Dong-hui ZHANG Xin-ling SUN Xiao-yun Department of Electrical and lnformation. Huazhong University of Science and Technology Wuhan 430074 China Department of Electrical and Information. Hebei University of Science and Technology Shijiazhuang 050054 China

An intelligent detecting system based on wireless transmission is designed. Its hardware includes the card reading module, the wireless digital transmission module, the LCD module, the random password keyboard module and a 16×16 lattice word database based on e-Flash MM36SB020. Its software is a communication protocol between the central control computer and the entrance management base station. To resolve the conflicting problems occurred during the data transmission, a method of delaying time at random is proposed.

关键词： Communication protocol Delaying time Random entrance management base station Random password keyboard Wireless digital transmission

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Microstructure and mechanical properties of Mg-4Zn-xGd(x=0,0.5,1,2)alloys

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Journal of Magnesium and Alloys 2020年第2期8卷 441-451页

作者： Cui-ju Wang Jin-wen Kang Kun-kun Deng Kai-bo Nie wei liang wei-guo li Shanxi Key laboratory of advanced magnesium-based materials College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024PR China Engineering training center Taiyuan University of TechnologyTaiyuan 030024PR China

The present work inainly focuses on tlie effect of minor cofiteut of Gd cicmcnt on the micrGstmcturc and mechanical properties of Mg Zn *** Mg-4Zn-xGd(x=0,0.5,1,2)alloys were fabricated and subjected to extrusion at 280℃ with the ratio of 25:*** revealed that the addition of Gd could inhibit the dynamic recrystallization(DRX)of Mg-4Zn alloy,and both the size and volume fraction of DRXed grains demonstrated a decreasing tendency as the Gd content increased from 0.5 to 2 wt.%.It is the weakening effect on DRX behavior that lead to the smaller amount of fine precipitate and the stronger texture *** compared with the Mg-4Zn alloy,the yield strength and ultimate tensile strength of Mg-4Zn-xGd alloys were improved obviously by the addition of minor content of Gd,however,at the expense of *** tensile properties with the yield strength of〜369.8 MPa and ultimate tensile strength of〜400.3 MPa were obtained when the Gd content was 2 wt.%.

关键词： Magnesium alloy Dynamic recrystallization Dynamic precipitation Microstructure Mechanical properties

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