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Acta Metallurgica Sinica(English Letters) 2019年第3期32卷 391-400页

作者： Ming He Xian-Liang Li Xing-An Liu Xiao-Wei Zhu Tie Liu Qiang Wang Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern University School of Metallurgy Northeastern University School of Materials Science and Engineering Northeastern University

Ambient temperature of induction coil is an important factor to influence the implementation of the electromagnetic induction-controlled automated steel-teeming(EICAST) technology. Meanwhile, it also affects the formation of Fe–C alloy blocking layer, which determines the length and installation position of induction coil. An experimental platform was designed to imitate actual working conditions in a ladle with the EICAST system. Ambient temperature of induction coil under high-temperature condition was measured to verify the accuracy of numerical result. After containing molten steel for 120 min and steel teeming for 40 min, the ambient temperature on the upper side of induction coil is 791 °C. In addition, the position of blocking layer in a 110 t ladle was measured by sand-collection and steel-pour methods, and the criterion temperatures of blocking layer in numerical simulation process were corrected. When the refining temperature is1600 °C and the containing time of molten steel is 120 min, the thickness of blocking layer is 130 mm, and the distance between the upper surface of blocking layer and the upper surface of nozzle brick is 154 mm. When the criterion temperatures are 919 °C and 428 °C, the numerical results can be used to confirm the position of blocking layer and the installation position of induction coil.

关键词： Clean steel EICAST technology Heat transfer Blocking layer coil ambient temperature

Flexible liquid metal coil prepared for electromagnetic energy harvesting and wireless charging

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Frontiers in Energy 2019年第3期13卷 474-482页

作者： Shen GUO Peng WANG Jichuan ZHANG Wenpeng LUAN Zishuo XIA Lingxiao CAO Zhizhu HE China Electric Power Research Institute Beijing 100192China Vehicle Engineering College of EngineeringChina Agricultural UniversityBeijing 100083China Tianjin Microfluidic Technology Co. Ltd.Tianjin 300457China

This paper reported a study on a flexible liquid metal coil (LMC) for electromagnetic collection from the transmission line for self-powered sensor and electromagnetic generation for wireless charging of cellular telephone. The room temperature liquid metal of Galinstan was perfused to elastic silicone tube, which is then terminated with galliumplated copper wire. The asprepared liquid metal wire can sustain stretching, twisting, and bending with large deformation, and has a good electrical contact stability with the external circuit. The LMC based magnetic energy harvester was then designed and demonstrated to collect the magnetic field energy induced by a wire carrying alternating current. The power of 260 mW was obtained for the wire carrying current of 10 A. The flexible toroidal inductor was fabricated and tested for magnetic energy harvesting. The flexible spiralshaped LMC was also designed and demonstrated to power cellular telephone through wireless charging. The present study opens the way for further applications of elastic LMC in electromagnetic energy harvesting and charging.

关键词： liquid metal Galinstan flexible coil electromagnetic energy harvesting wireless charging

Modeling and Configuration Design of Electromagnetic Actuation coil for a Magnetically Controlled Microrobot

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Chinese Journal of Mechanical Engineering 2019年第4期32卷 13-25页

作者： Xiaolong Jing Weizhong Guo Institute of Design and Control Engineering for Heavy Equipment School of Mechanical Engineering Shanghai Jiao Tong University

Non-contact actuated microbeads have attracted a lot of attention in recent years because of its enormous potential in medical, biological, and industrial applications. Researchers have proposed a multitude of electromagnetic actuation(EMA) systems consisting of a variety of coil pairs. However, a unified method to design and optimize a coil pair according to technical specifications still does not exist. Initially, this paper presented the modeling of an untethered ferromagnetic particle actuated by externally applied magnetic field. Based on the models, a simple method of designing and optimizing the EMA coil pair according to technical specifications, was proposed. A loop-shaped coil pair generating uniform magnetic and gradient fields was chosen to demonstrate this method clearly and practically. The results of the optimization showed that the best distance to radius ratio of a loop-shaped coil pair is 1.02 for a uniform magnetic field and 1.75 for a uniform gradient field. The applicability of the method to other shapes of coil configuration was also illustrated. The best width to distance ratio for a square-shaped coil pair is 0.558 and 0.958 for uniform magnetic and gradient fields, respectively. The best height to width ratio and distance to width ratio for a rectangle-shaped coil pair is h/w =[0.9,1.1], d/w =[0.5,0.6] for uniform magnetic field and h/w =[1.0,1.2], d/w =[0.9,1.1] for uniform gradient field. Furthermore, simulations of a microparticle tracking the targeted trajectory were conducted to analyze the performance of the newly designed coils. The simulations suggested the ability of manipulating microparticles via the coils designed by our proposed method. The research mainly proposed a unified design and optimization method for a coil pair, which can support researchers while designing a specific coil pair according to the technical requirements. This study is aimed at researchers who are interested in EMA system and microrobots.

关键词： Micro-robot/particle coil configuration design and optimization Electromagnetic actuation Trajectory tracking

A coil Constant Calibration Method Based on the Phase-Frequency Response of Alkali Atomic Magnetometer

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Photonic Sensors 2019年第2期9卷 189-196页

作者： Danyue MA Junpeng ZHAO Jixi LU Ming DING School of Instrumentation Science and Opto-electron ics Engineering Beihang University Beijing 100191 China

We propose an in-situ method to calibrate the coil constants of the optical atomic magnetomete. This method is based on measuring the Larmor precession of spin polarized alkali metal atoms and has been demonstrated on a K-Rb hybrid atomic magnetomete. Oscillation fields of different frequencies are swept on the transverse coil. By extracting the resonance frequency through phase-frequency analysis of electron spin projection, the coil constants are calibrated to be 323.1±0.28 nT/mA, 108±0.04nT/Ma, and 185.8±1.03 nT/mA along the X,Y, and Z directions, respectively.

关键词： Optical atomic magnetometer coil constant calibration phase-frequency analysis Larmor precession

Experimental Study of Effect of Air Duct Structures on Heat Dissipation of Heating-Only Fan coil

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湖南大学学报（自然科学版） 2009年第S1期36卷 102-105页

作者： WU Xiao-zhou,ZHAO Jia-ning(School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin,Heilongjiang 150090,China) School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

Heating-only fan coil(HFC)is one of the suited end users,which is not only compact but also highly *** the major factors affecting the heat dissipation performance of HFC include leakage through coil bypass,distance between fan and coil,fan structure and air inlet *** natural air convection or forced,experimental studies were made on the effects of these factors upon the heat dissipation performance of *** results show that:1)After reducing the leakage through coil bypass,the heat dissipation of HFC increases 16.9% under natural convection,and increases 8.3% under forced convection.2)After the distance between fan and coil be raised from 23.2cm to 41.7cm,the heat dissipation of HFC decreases 21.3% under natural convection,but increases12.8% under forced convection.3)After changing the fan structure,the heat dissipation of HFC increases 41.8% under natural convection,and the heat dissipation per motor power increases 96.1% under forced convection.4)The heat dissipations of HFC with round pass,slit and strip type of air inlet are different,whose proportion is about 100%,110%,136% under natural convection,and 100%,105%,116% under forced convection.

关键词： heating-only fan coil heat dissipation performance air duct structure natural convection forced convection

Parametric effect of large impulse current excited coil on electromagnetic force in coil-sheet system

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中国有色金属学会会刊：英文版 2009年第S3期19卷 806-810页

作者：许威方洪渊曹军丁文斌单平 School of Material Science and Engineering Tianjin University Technology Department of Offshore Oil Offshore Oil Engineering Company Ltd. Research Center of China Offshore Oil Corporation State Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology

Based on the method of controlling welding stress with trailing, the electromagnetic force in coil-sheet system was simulated with finite element software ANSYS. The effect of parameters of coil on the electromagnetic force density fy was analyzed. The results show that the maximum electromagnetic force density fy, max in sheet appears in the position near the inner radius of single-turn coil. The position is independent of section shape of coil. fy, max for flat coil is larger than that for long coil and the coil with wedge shape section, while section areas of all coils are equal to each other. The effect of turn number of multiple-turn coil on fy is dependent on the loop resistance in circuit. The kind of coil with more turns and larger inductance is commended while there is larger loop resistance in circuit. fy increases in a certain magnitude while a magnetic core is located in coil. However, the magnitude of fy is limited by saturating magnetic flux of the core.

关键词： electromagnetic force parameters of coil impulse current sheet

Nano-hydroxyapatite formation via co-precipitation with chitosan-g-poly（N-isopropylacrylamide） in coil and globule states for tissue engineering application

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Frontiers of Chemical Science and Engineering 2013年第4期7卷 388-400页

作者： Yang YU Hong ZHANG Hong SUN Dandan XING Fanglian YAO School of Chemical Engineering and Technology Key Laboratory of Systems Bioengineering of Ministry of Education Tianjin University Tianjin 300072 China Consolidated Research Institute for Advanced Science and Medical Care Waseda University (ASMeW) Shinjuku-ku Tokyo 162-0041 Japan Basic Medical College Hebei United University Tangshan 063000 China

With the excellent biocompatibility and osteo- conductivity, nano-hydroxyapatite （nHA） has shown significant prospect in the biomedical applications. Con- trolling the size, crystallinity and surface properties of nHA crystals is a critical challenge in the design of HA based biomaterials. With the graft copolymer of chitosan and poly（N-isopropylacrylamide） in coil and globule states as a template respectively, a novel composite from chitosan-g-poly（N-isopropylacrylamide） and nano-hydro- xyapatite （CS-g-PNIPAM/nHA） was prepared via co- precipitation. Zeta potential analysis, thermogravimetric analysis and X-ray diffraction were used to identify the formation mechanism of the CS-g-PNIPAM/nHA compo- site and its morphology was observed by transmission electron microscopy. The results suggested that the physical aggregation states of the template polymer could induce or control the size, crystallinity and morphology of HA crystals in the CS-g-PNIPAM/nHA composite. The CS-g-PNIPAM/nHA composite was then introduced to chitosan-gelatin （CS-Gel） polyelectronic complex and the cytocompatibility of the resulting CS- Gel/composite hybrid film was evaluated. This hybrid film was proved to be favorable for the proliferation of MC 3T3-E1 cells. Therefore, the CS-g-PNIPAM/nHA compo- site is a potential biomaterial in bone tissue engineering.

关键词： chitosan poly(N-isopropylacrylamide),hydroxyapatite coil globule bone tissue engineering

Amino acid substitutions of GLY98, LEU245 and GLU543 in coil distinctively affect jasmonate-regulated male fertility in Arabidopsis

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Science China(Life Sciences) 2014年第1期57卷 145-154页

作者： HUANG Huang WANG CuiLi TIAN HaiXia SUN Yu XIE DaoXin SONG SuSheng Tsinghua-Peking Center for Life Sciences MOE Key Laboratory of Bioinformatics School of Life Sciences Tsinghua University Beijing 100084 China

Jasmonate （JA） regulates various plant defense and developmental processes. The F-box protein CORONATINE INSENSITIVE 1 （coil） perceives JA signals to mediate diverse plant responses including male fertility, root growth, antho- cyanin accumulation, and defense against abiotic and biotic stresses. In this study, we carried out genetic, physiological and biochemical analysis on a series of coil mutant alleles, and found that different amino acid mutations in coil distinctively af- fect JA-regulated male fertility in Arabidopsis. All the JA responses are disrupted by the coil mutations W467＂ in coil-l, Q343＂（coil-6）, G369E （coil-4）, G98D （coil-5）, G155E （coil-7）, D452A （coil-9） and L490A （coil-10）, though the coil-5 mutant （coilG98D） contains adequate coil protein （~60% of wild-type）. Interestingly, the low basal level of coilE543K in the coil-8 mutant （-10% of wild-type coil level） is sufficient for maintaining male fertility （-50% of wild-type fertility）; the coil-2 mutant with low level of coilLz45F （-10% of wild-type） is male sterile under normal growth condition （22℃） but male fertile （~80% of wild-type fertility） at low temperature （16℃）; however, both coil-2 and coil-8 are defective in the other JA responses （root growth, anthocyanin accumulation, and plant response to the pathogen Pst DC3000 infection）.

关键词： coil coil-2 coil-5 coil-8 jasmonate male fertility

Central retinal artery occlusion after endovascular coil embolization for internal carotid artery aneurysm

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International Journal of Ophthalmology(English edition) 2019年第3期12卷 520-522页

作者： Ying-Li Wang Yan-Nian Hui Ran Chen Yang-Yang Jin Jun Tao Yu-Mei Zhou Department of Ophthalmology Meitan General Hospital Department of Ophthalmology Xijing Hospital Fourth Military Medical University

Dear Editor,We are writing this letter to report an unexpected rare caseofcentralretinalarteryocclusion(CRAO)happened after stent-assisted coiling for internal carotid artery(ICA)aneurysm in a female *** is a devastating ocular emergency with poor visual prognosis and no universal *** witharterialhypertension,diabetesmellitus,renaldisease.

关键词： Figure Central retinal artery occlusion after endovascular coil embolization for internal carotid artery aneurysm ICA FFA

coil-rod-coil刚柔嵌段共聚物在选择性溶剂中的自组装

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高分子学报 2014年第4期24卷 514-522页

作者：陈增磊何林李温州大学物理与电子信息工程学院温州325035

采用耗散粒子动力学方法(dissipative particle dynamics,DPD)研究了coil-rod-coil(CRC)三嵌段刚柔共聚物在选择性溶剂中的自组装.在链选择性溶剂中,刚性棒长Lr与柔性链长Lc都影响着CRC溶液的自组装及相转变.随Lr的增大,棒与溶剂的接触... 详细信息

采用耗散粒子动力学方法(dissipative particle dynamics,DPD)研究了coil-rod-coil(CRC)三嵌段刚柔共聚物在选择性溶剂中的自组装.在链选择性溶剂中,刚性棒长Lr与柔性链长Lc都影响着CRC溶液的自组装及相转变.随Lr的增大,棒与溶剂的接触面变大界面能升高,为减小体系的自由能,棒嵌段趋向聚集以减少接触面与界面能.随Lc的增大,链的自由伸展构象熵增大,影响着棒嵌段聚集体结构的形成,使棒嵌段的分布更加分散.在研究溶剂性质aCS与棒长Lr对体系自组装影响的情况中,观察到两类有趣的相结构:球形相和胶束相.随着参数aCS从亲链变为中性再到亲棒,在球形相内部,不仅棒相区由球体内部移向球表面,而且棒相区与链相区的层次分布也发生了明显地变化.同样,Lr的改变也影响着球形相内部相区的分布,同时诱导了不同球形相间的构型转变.胶束相包括分段胶束和螺旋胶束两种,形成于棒长较长的情况,胶束相中棒嵌段的排列呈现出明显的液晶相结构.

关键词：耗散粒子动力学 coil—Rod coil 选择性溶剂自组装界面能