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Exchange interaction and demagnetization process of high-abundance rare-earth magnets sintered using dual alloy method

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Science China(Physics,Mechanics & Astronomy) 2022年第4期65卷 104-111页

作者： Dan Liu Tongyun Zhao Jiaying Jin Tianyu Ma jiefu xiong Baogen Shen Fengxia Hu Jirong Sun Department of Physics School of Artificial IntelligenceBeijing Technology and Business UniversityBeijing 100048China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China State Key Laboratory of Magnetism Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China

The 2:14:1-type rare-earth(RE)-Fe-B permanent magnets prepared by the dual alloy method have been found to possess much superior magnetic properties to those prepared by the single alloy method,providing an appealing route to promote the utilization of high-abundance RE elements Ce and La and balance the use of the RE ***,the relationship between magnetic interactions among different 2:14:1 main phases and superior magnetic properties is still *** this study,we investigated the magnetic interactions and reversal field distribution in these magnets using first-order reversal curve(FORC)*** FORC images showed that(Nd,Pr)27.8(La,Ce)2.7FebalM1.4B1.0(S-9)and(Nd,Pr)19.5(La,Ce)11.0FebalM1.4B1.0(S-36)have the characteristics of multiple main *** reverse magnetic fields corresponding to the soft and hard main phases,as well as the associated exchange coupling,were highly dependent on the La Ce *** higher the La Ce content,the weaker the exchange coupling and the more asynchronous the demagnetization *** addition,the FORC images indicated that the magnetization reversal process also varies with La Ce content,where the nucleation and propagation of reversed domains dominant in the S-9 magnet,while the domain propagation in the S-36 magnet is considerably *** micromagnetic simulations also revealed that the coercivity and exchange coupling of multi-main-phase magnets decrease with increasing La Ce content,correlating well with the experimental *** findings may not only contribute to a better understanding of the complex magnetic interactions between the soft and hard phases and how they affect macroscopic magnetic properties but also help in improving the magnetic performance of the RE-Fe-B magnets with high La Ce content.

关键词： permanent magnets exchange interaction first-order reversal curve micromagnetism high abundance rare-earth magnets

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Tunable In-Plane Anisotropy in Amorphous Sm Co Films Grown on(011)-Oriented Single-Crystal Substrates

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Engineering 2020年第2期6卷 159-164页

作者： Wenhui Liang Houbo Zhou jiefu xiong Fengxia Hu Jia Li Jian Zhang Jing Wang Jirong Sun Baogen Shen Beijing National Laboratory for Condensed Matter Physics and State Key Laboratory of Magnetism Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Fujian Institute of Innovation Chinese Academy of SciencesFuzhou 350108China

Amorphous Sm-Co films with uniaxial in-plane anisotropy have great potential for application in information-storage media and spintronic *** most effective method to produce uniaxial inplane anisotropy is to apply an in-plane magnetic field during ***,this method inevitably requires more complex ***,we report a new way to produce uniaxial in-plane anisotropy by growing amorphous Sm-Co films onto(011)-cut single-crystal substrates in the absence of an external magnetic *** tunable anisotropy constant,kA,is demonstrated with variation in the lattice parameter of the substrates.A kA value as high as about 3.3×10^4J·m^-3 was obtained in the amorphous Sm-Co film grown on a LaAlO3(011)*** analysis indicated that the preferential seeding and growth of ferromagnetic(FM)domains caused by the anisotropic strain of the substrates,along with the formed Sm-Co,Co-Co directional pair ordering,exert a substantial *** work provides a new way to obtain in-plane anisotropy in amorphous Sm-Co films.

关键词： Amorphous Sm-Co films In-plane uniaxial anisotropy Sputtering

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Classification and Prediction of Skyrmion Material Based on Machine Learning

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Research 2023年第4期2023卷 281-291页

作者： Dan Liu Zhixin Liu JinE Zhang Yinong Yin Jianfeng Xi Lichen Wang jiefu xiong Ming Zhang Tongyun Zhao Jiaying Jin Fengxia Hu Jirong Sun Jun Shen Baogen Shen Department of Physics School of Artificial IntelligenceBeijing Technology and Business UniversityBeijing 100048P.R.China School of Integrated Circuit Science and Engineering Beihang UniversityBeijing 100191China Ningbo Institute of Materials Technology&EngineeringChinese Academy of SciencesZhejiang 315201P.R.China School of Physics Inner Mongolia University of Science and TechnologyBaotou 014010P.R.China State Key Laboratory of Magnetism Institute of PhysicsChinese Academy of SciencesBeijing 100190P.R.China School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027P.R.China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190P.R.China

The discovery and study of skyrmion materials play an important role in basic frontier physics research and future information *** database of 196 materials,including 64 skyrmions,was established and predicted based on machine learning.A variety of intrinsic features are classified to optimize the model,and more than a dozen methods had been used to estimate the existence of skyrmion in magnetic materials,such as support vector machines,k-nearest neighbor,and ensembles of *** is found that magnetic materials can be more accurately divided into skyrmion and non-skyrmion classes by using the classification of electronic *** that the rare earths are the key elements affecting the production of *** accuracy and reliability of random undersampling bagged trees were 87.5%and 0.89,respectively,which have the potential to build a reliable machine learning model from small *** existence of skyrmions in LaBaMnO is predicted by the trained model and verified by micromagnetic theory and experiments.

关键词： frontier earths verified

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Coupling of BiOCl Ultrathin Nanosheets with Carbon Quantum Dots for Enhanced Photocatalytic Performance

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Transactions of Tianjin University 2024年第3期30卷 211-220页

作者： Pin Song Xiaoyu Fang Wei Jiang Yuyang Cao Daobin Liu Shiqiang Wei Jun Du Lang Sun Lei Zhao Song Liu Yuzhu Zhou Jun Di Chade Lv Bijun Tang jiefu Yang Tingting Kong Yujie xiong Key Laboratory of Functional Molecular Solids Ministry of EducationAnhui Engineering Research Center of Carbon NeutralityCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241000China National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceSchool of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230029China School of Chemistry and Chemical Engineering National Special Superfi ne Powder Engineering Research CenterNanjing University of Science and TechnologyNanjing 210094China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China School of Materials Science&Engineering Nanyang Technological UniversitySingapore 639798Singapore

Over the past few decades,photocatalysis technology has received extensive attention because of its potential to mitigate or solve energy and environmental pollution *** novel materials with outstanding photocatalytic activities has become a research hotspot in this *** this study,we prepared a series of photocatalysts in which BiOCl nanosheets were modified with carbon quantum dots(CQDs)to form CQDs/BiOCl composites by using a simple solvothermal *** photocatalytic performance of the resulting CQDs/BiOCl composite photocatalysts was assessed by rhodamine B and tetracycline degradation under visible-light *** with bare BiOCl,the photocatalytic activity of the CQDs/BiOCl composites was significantly enhanced,and the 5 wt%CQDs/BiOCl composite exhibited the highest photocatalytic activity with a degradation efficiency of 94.5%after 30 min of ***,photocatalytic N_(2)reduction performance was significantly improved after introducing *** 5 wt%CQDs/BiOCl composite displayed the highest photocatalytic N_(2)reduction performance to yield NH_3(346.25μmol/(g h)),which is significantly higher than those of 3 wt%CQDs/BiOCl(256.04μmol/(g h)),7 wt%CQDs/BiOCl(254.07μmol/(g h)),and bare BiOCl(240.19μmol/(g h)).Our systematic characterizations revealed that the key role of CQDs in improving photocatalytic performance is due to their increased light harvesting capacity,remarkable electron transfer ability,and higher photocatalytic activity sites.

关键词： Carbon quantum dots BiOCl Rhodamine B Tetracycline Photocatalysis

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Flight control of a flying wing aircraft based on circulation control using synthetic jet actuators

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Chinese Journal of Aeronautics 2023年第10期36卷 152-164页

作者： Zhijie ZHAO xiong DENG Zhenbing LUO Wenqiang PENG Jianyuan ZHANG jiefu LIU College of Aeronautics and Astronautics National University of Defense TechnologyChangsha 410073China

To achieve the nice stealth performance and aerodynamic maneuverability of a Flying Wing Aircraft(FWA),a longitudinal aerodynamic control technology based on circulation control using trailing-edge synthetic jet actuators was proposed without the movement of *** on the longitudinal aerodynamic characteristics of a small-sweep FWA were ***,flight tests were carried out to verify the control abilities,providing a novel technology for the design of a future rudderless *** show that synthetic jets could narrow the dead zone area,improve the flow velocity near the trailing edge,and then move the trailing-edge separation point and the leading-edge stagnation point downwards,which make the effective Attack of Angle(AOA)increase,thereby enhancing the pressure envelope *** control based on synthetic jets could improve the lift,drag and nose-down *** variations of lift and nosedown moment decrease with the growth of AOA caused by the improved reverse pressure gradient and the weakened circulation control ***,synthetic jet actuators were integrated into the trailing edge of a small-sweep FWA,which could realize the roll and pitch control without deflections of rudders during the cruise stage,and the maximum roll and pitch angular velocity are 12.64(°)/s and 8.51(°)/s,respectively.

关键词： Synthetic jets Flying wing aircraft Circulation control Control mechanism Flight test

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Novel yaw effector of a flying wing aircraft based on reverse dual synthetic jets

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Chinese Journal of Aeronautics 2023年第12期36卷 151-163页

作者： Zhijie ZHAO Zhenbing LUO xiong DENG Jianyuan ZHANG Zhaofeng DONG jiefu LIU Shiqing LI College of Aeronautics and Astronautics National University of Defense TechnologyChangsha 410073China

For achieving the nice stealth performance and aerodynamic maneuverability of a Flying Wing Aircraft(FWA),a novel yaw effector based on Reverse Dual Synthetic Jets(RDSJ)was proposed without the movement of *** on aerodynamic characteristics of a small-sweep FWA and control mechanism were investigated by numerical ***,reverse dual synthetic jet actuators were integrated into a real FWA and flight tests were firstly carried *** results show that RDSJ could make drag coefficient increase and weaken lift coefficient,which generate a yawing moment and a rolling moment in the same direction,realizing control of heading attitudes,but strong coupling with the pitching moment occurs at large angles of *** control mechanism,RDSJ could produce two reverse synthetic jets out of phases,improve the reverse pressure gradient and hence form alternate recirculation zones or even early large-area separation,which cause the rise of pressures before exits and the dip of pressures behind exits,achieving improvement of drag and the yawing *** results of flight tests support that RDSJ could realize control of heading attitudes without deflections of rudders during the cruise stage and achieve the maximal yaw angular velocity of 10.12(°)/s,verifying the feasibility of this novel yaw effector.

关键词： Control mechanism Dual synthetic jets Flight tests Flying wing aircraft Yaw control

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Novel roll effector based on zero-mass-flux dual synthetic jets and its flight test

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Chinese Journal of Aeronautics 2022年第8期35卷 1-6页

作者： Zhenbing LUO Zhijie ZHAO jiefu LIU xiong DENG Mu ZHENG Hang YANG Qingyang CHEN Shiqing LI College of Aeronautics and Astronautics National University of Defense TechnologyChangsha 410073China

The autonomous and controllable Dual Synthetic Jet Actuator(DSJA)is firstly integrated into the Unmanned Aerial Vehicle(UAV),and flight tests without the deflection of rudders are carried out to verify the viability of DSJA to control the attitudes of UAV during *** is improved into an actuator with two diaphragms and three cavities,which has higher energy ***,differentially distributed on both sides of the wings,are installed on the trailing edge close to the wing *** tests,containing Differential Circulation Control(DCC)using double-side actuators,Positive Circulation Control(PCC)using left-side actuators and Negative Circulation Control(NCC)using right-side actuators,are implemented at cruising speed of 25 m/*** show that roll attitude control without rudders could be realized by *** and NCC can generate the rightward roll and yaw angular velocity,prompting UAV to turn *** stronger controlling ability can be achieved by DCC,with the maximum roll angular velocity of 15.62(°)/*** can generate a rightward roll moment,but a leftward yaw moment will be produced at the same *** yaw induces the leftward rolling moment,which weakens the roll control effect,making UAV keep to yaw to the left with a small slope.

关键词： Active flow control Actuators with two diaphragms and three cavities Circulation control Dual synthetic jets Flight test Roll attitude control

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合成射流吹/吸程环量控制数值模拟研究

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Acta Mechanica Sinica 2023年第6期39卷 31-45页

作者：李石清罗振兵邓雄王林赵志杰刘杰夫 College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410000China

通过数值模拟手段在NACA0015翼型上对合成射流环量控制过程进行了研究,并通过流场结果分析了吸程和吹程的控制机制.基于翼型弦长(c)和来流速度(U_(∞))的雷诺数(Re)为250000.合成射流出口分别布置在翼型的上后缘和下后缘.结果表明,在上... 详细信息

通过数值模拟手段在NACA0015翼型上对合成射流环量控制过程进行了研究,并通过流场结果分析了吸程和吹程的控制机制.基于翼型弦长(c)和来流速度(U_(∞))的雷诺数(Re)为250000.合成射流出口分别布置在翼型的上后缘和下后缘.结果表明,在上后缘和下后缘施加合成射流控制有显著增升效果,其控制效果与动量系数(C_(μ))和无量纲频率(F^(+))有关.合成射流的吹程和吸程都有助于提升升力.当上后缘施加合成射流控制时,增升效果随无量纲频率增加略有减弱.相反地,下后缘合成射流控制效果随无量纲频率增加而增加.无论合成射流环量控制布置在上后缘或下后缘,控制效果都随着动量系数的增加而增加.

关键词：合成射流环量控制增升效果动量系数无量纲频率吹程雷诺数控制机制

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基于前缘合成双射流的飞翼布局纵向气动控制特性研究

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空气动力学学报 2022年第5期40卷 79-90页

作者：邓雄赵志杰王秋旺罗振兵刘杰夫国防科技大学空天科学学院长沙410073 西安交通大学能源与动力工程学院西安710049

为兼顾飞翼布局飞行器的隐身性和气动操控性,提出了一种基于合成双射流的飞翼布局纵向气动控制技术,研究其对小后掠飞翼布局大攻角下的气动操控能力。采用数值模拟方法,分析了前缘阵列式合成双射流与不同攻角飞翼布局流场的相互作用,探... 详细信息

为兼顾飞翼布局飞行器的隐身性和气动操控性,提出了一种基于合成双射流的飞翼布局纵向气动控制技术,研究其对小后掠飞翼布局大攻角下的气动操控能力。采用数值模拟方法,分析了前缘阵列式合成双射流与不同攻角飞翼布局流场的相互作用,探究其对飞翼布局纵向气动特性的影响,最后对比了传统合成射流控制,突出了其优势。结果表明:前缘阵列式合成双射流可有效提高大攻角升力、减小阻力,增大升阻比,同时还会使俯仰力矩出现非线性变化,具备大攻角滚转姿态操控能力;合成双射流在前缘形成周期性涡结构,增强了边界层底部低速流体与主流的动量交换,提高了边界层抗逆压梯度的能力;攻角8°~10°时,合成双射流可完全抑制前缘分离,但攻角10°时,在靠近后缘处形成分离区,使升力略有减小;攻角12°时,合成双射流可推迟流动分离,分离线移动至机翼中段;攻角14°~16°时,合成双射流虽然仅可有效抑制靠近展向分离起始位置处的流动分离,但同时也增加了分离区内的流动能量,有效提高升力;攻角18°时,吸力面近乎完全分离,合成双射流虽未能有效抑制分离,但会使前缘吸力峰值回升,仍有增升、减阻的效果;与合成射流相比,合成双射流控制产生的气动变化量更大,更具应用潜力。

关键词：飞翼布局合成双射流流动分离纵向气动控制增升减阻

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基于分布式合成双射流的飞行器无舵面三轴姿态控制飞行试验

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力学学报 2022年第5期54卷 1220-1228页

作者：赵志杰罗振兵刘杰夫邓雄彭文强李石清国防科技大学空天科学学院长沙410073

将自主可控的合成双射流激励器集成于常规布局飞行器中,进行了三轴无舵面控制飞行试验,验证了分布式合成双射流对飞行器巡航时的无舵面姿态调控能力.对合成双射流激励器进行改进,设计了分布式三轴姿态控制合成双射流激励器,滚转环量控... 详细信息

将自主可控的合成双射流激励器集成于常规布局飞行器中,进行了三轴无舵面控制飞行试验,验证了分布式合成双射流对飞行器巡航时的无舵面姿态调控能力.对合成双射流激励器进行改进,设计了分布式三轴姿态控制合成双射流激励器,滚转环量控制激励器分别安装于两侧机翼翼尖处后缘,射流出口靠近压力面;偏航反向合成双射流控制激励器分别安装于靠近两侧机翼翼尖20%弦长处,上、下沿展向均匀布置;俯仰环量控制激励器安装于V尾下的平尾后缘,射流出口靠近压力面.针对巡航速度为30 m/s的飞行器,进行了三轴姿态控制飞行试验,结果表明:分布式合成双射流实现了飞行器巡航时的三轴无舵面姿态操控;横航向控制存在耦合,滚转环量控制激励器实现了飞行器的双向滚转操控,能产生的最大滚转角速度达16.87°/s,偏航反向合成双射流控制激励器实现了飞行器的双向偏航操控,能产生的最大偏航角速度达9.09°/s;俯仰环量控制激励器实现了飞行器的纵向控制,能产生的最大俯仰角速度达7.68°/s.

关键词：分布式合成双射流环量控制反向合成双射流控制三轴姿态操控飞行试验

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