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美军航空卫生机动力量快速部署的启示

医学研究与战创伤救治 2024年第5期37卷 522-525页

作者：陈杨马亦飞刘振华周开园张建杰空军军医大学空军卫勤训练基地军事体育教研室西安710032 空军军医大学空军卫勤训练基地卫生勤务教研室西安710032

文章针对美军航空卫生机动力量建设的需求牵引与作用职能,通过研究分析美军航空卫生机动力量在人员架构、作用职能、训练培养等方面的先进做法,对中国人民解放军航空卫生机动力量建设提出启发建议,为实现联合作战条件下的保障打赢提供... 详细信息

文章针对美军航空卫生机动力量建设的需求牵引与作用职能,通过研究分析美军航空卫生机动力量在人员架构、作用职能、训练培养等方面的先进做法,对中国人民解放军航空卫生机动力量建设提出启发建议,为实现联合作战条件下的保障打赢提供理论参考。

关键词：航空医学机动力量快速部署

Stochastic spin-orbit-torque device as the STDP synapse for spiking neural networks

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Science China(Physics,Mechanics & Astronomy) 2023年第5期66卷 188-194页

作者： Haotian Li Liyuan Li kaiyuan zhou Chunjie Yan Zhenyu Gao Zishuang Li Ronghua Liu National Laboratory of Solid State Microstructures Jiangsu Provincial Key Laboratory for NanotechnologySchool of PhysicsNanjing UniversityNanjing 210093China

Neuromorphic hardware,as a non-Von Neumann architecture,has better energy efficiency and parallelism than the conventional ***,with the numerical modeling spin-orbit torque(SOT)device using current-induced SOT and Joule heating effects,we acquire its magnetization stochastic switching probability as a function of the interval time of input current pulses and use it to mimic the spike-timing-dependent plasticity learning behavior like actual brain *** further demonstrate that the artificial spiking neural network(SNN)built by this SOT device can perform unsupervised handwritten digit recognition with an accuracy of 80%and logic operation *** work provides a new clue to achieving SNN-based neuromorphic hardware using high-energy efficiency and nonvolatile spintronics nanodevices.

关键词： spin-orbit torque neuromorphic hardware spiking neural network stochastic magnetization reversal

Temperature-and field angular-dependent helical spin period characterized by magnetic dynamics in a chiral helimagnet MnNb_(3)S_(6)

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Science China(Physics,Mechanics & Astronomy) 2023年第1期66卷 171-177页

作者： Liyuan Li Haotian Li kaiyuan zhou Yaoyu Gu Qingwei Fu Lina Chen Lei Zhang Ronghua Liu National Laboratory of Solid State Microstructures School of Physics and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China New Energy Technology Engineering Laboratory of Jiangsu Province&School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China

The chiral magnets with topological spin textures provide a rare platform to explore topology and magnetism for potential application ***,we study the magnetic dynamics of several spin configurations on the monoaxial chiral magnetic crystal MnNb_(3)S_(6)via broadband ferromagnetic resonance(FMR)technique at cryogenic *** the high-field forced ferromagnetic state(FFM)regime,the obtained frequency f *** field H_(res) dispersion curve follows the wellknown Kittel formula for a single FFM,while in the low-field chiral magnetic soliton lattice(CSL)regime,the dependence of H_(res) on magnetic field angle can be well-described by our modified Kittel formula including the mixture of a helical spin segment and the FFM ***,compared with the sophisticated Lorentz micrograph technique,the observed magnetic dynamics corresponding to different spin configurations allow us to obtain temperature-and field-dependent proportion of helical spin texture and helical spin period ratio L(H)/L(0)via our modified Kittel *** results demonstrated that fieldand temperature-dependent nontrivial magnetic structures and corresponding distinct spin dynamics in chiral magnets can be an alternative and efficient approach to uncovering and controlling nontrivial topological magnetic dynamics.

关键词： chiral helimagnets magnetic solitons ferromagnetic resonance phase diagram

基于STM32的硬件协议NTP网络时钟系统实现

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电子器件 2024年第3期47卷 641-648页

作者：赵瑞康王素珍苗其军邹开元青岛大学电子信息学院山东青岛266071 海信智动精工有限公司山东青岛266520

为解决在操作系统环境下传输及提取NTP信息方法复杂度高、设备冗余的问题,联合STM32F103C8T6微控制器和W5500芯片实现了一种硬件协议的NTP网络时钟系统。使用STM32微控制器通过SPI通信方式配置W5500芯片,实现硬件TCP和UDP协议。工作状... 详细信息

为解决在操作系统环境下传输及提取NTP信息方法复杂度高、设备冗余的问题,联合STM32F103C8T6微控制器和W5500芯片实现了一种硬件协议的NTP网络时钟系统。使用STM32微控制器通过SPI通信方式配置W5500芯片,实现硬件TCP和UDP协议。工作状态控制信息保存到STM32的FLASH存储器中,实现了断电保护功能。系统上电运行,自动读取配置信息,在硬件UDP协议中解析NTP数据,得到NTP时间信息,经过转换和计算后,成为时间基准信号,去同步STM32芯片中设计的本地时钟。经过反复测试得到,时钟系统的误差小于50 ms,工作稳定可靠。它适合网络中无计算机操作系统的设备进行时间同步。

关键词： NTP STM32 TCP W5500芯片时间同步

PBL与OBE理念在“汽车检测与维修”课程教学模式中的应用

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时代汽车 2024年第5期 34-36页

作者：郭文翠高献坤王庆朋周开塬金娥河南农业大学机电工程学院河南省郑州市450002

为了解决学生在课堂中存在的“课堂沉默”“学不能用”的问题,优化汽车检测与维修课程的教学模式。以PBL与OBE理念为基础,首先对课程教学现状进行分析,指出课程教学模式中存在的问题;然后,确定教学模式改革目标;最后,结合PBL与OBE理念... 详细信息

为了解决学生在课堂中存在的“课堂沉默”“学不能用”的问题,优化汽车检测与维修课程的教学模式。以PBL与OBE理念为基础,首先对课程教学现状进行分析,指出课程教学模式中存在的问题;然后,确定教学模式改革目标;最后,结合PBL与OBE理念确定教学模式改进方案。

关键词：教学模式 PBL理念 OBE理念汽车检测与维修

Field-and Current-Driven Magnetization Reversal and Dynamic Properties of CoFeB-MgO-Based Perpendicular Magnetic Tunnel Junctions

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Chinese Physics Letters 2020年第11期37卷 98-103页

作者： Qingwei Fu kaiyuan zhou Lina Chen Yongbing Xu Tiejun zhou Dunhui Wang Kequn Chi Hao Meng Bo Liu Ronghua Liu Youwei Du National Laboratory of Solid State Microstructures School of Physics and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China York-Nanjing Joint Center(YNJC)for Spintronics and Nanoengineering School of Electronics Science and EngineeringNanjing UniversityNanjing 210093China Centre for Integrated Spintronic Devices School of Electronics and InformationHangzhou Dianzi UniversityHangzhou 310018China Key Laboratory of Spintronics Materials Devices and Systems of Zhejiang ProvinceHangzhou 311305China

We report a perpendicular magnetic tunnel junction(p MTJ)cell with a tunnel magnetoresistance(TMR)ratio of nearly 200%at room temperature based on Co Fe B/Ta/Co Fe B as the free layer(FL)and a synthetic antiferromagnetic(SAF)multilayer[Pt/Co]/Ru/[Pt/Co]/Ta/Co Fe B as the reference layer(RL).The field-driven magnetization switching measurements show that the p MTJs exhibit an anomalous TMR hysteresis *** spin-polarized layer Co Fe B of SAF-RL has a lower critical switching field than that of *** reason is related to the interlayer exchange coupling(IEC)through a moderately thick Ta spacer layer among SAF-RLs,which generates a moderate and negative bias magnetic field on Co Fe B of ***,the IEC among RLs has a negligible influence on the current-driven magnetization switching of FL and its magnetization dynamics.

关键词： dynamics. magnetization negligible

航空医疗救援分队训练现状调查及影响因素分析

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空军军医大学学报 2024年第8期45卷 945-948,952页

作者：芦艳春余伟陈新刘振华马亦飞吴坤鹏周开园空军军医大学卫勤训练基地卫生勤务教研室陕西西安710032 空军军医大学基础医学院学员四大队十六队陕西西安710032 解放军96734部队卫生队湖南岳阳414000 空军军医大学卫勤训练基地训练处陕西西安710032

目的通过对航空医疗救援分队的人员特征、参训情况、训练需求和参训满意度进行调查分析,为训练与考核大纲的构建和训练装备的改进提供参考依据,提出促进航空医疗救援事业发展的对策建议。方法通过自编问卷,抽取航空医疗救援队的115名队... 详细信息

目的通过对航空医疗救援分队的人员特征、参训情况、训练需求和参训满意度进行调查分析,为训练与考核大纲的构建和训练装备的改进提供参考依据,提出促进航空医疗救援事业发展的对策建议。方法通过自编问卷,抽取航空医疗救援队的115名队员进行问卷调查。使用EpiData 3.1软件进行问卷数据录入和处理,采用SPSS 27.0软件进行统计学分析。结果救援队员对救治技能的培训需求较高,但救治理论、实践技能跟自身能力预期存在差异。参加过航空医疗救援任务或训练的队员对航空救援领域的了解度明显高于未参加者,低压氧舱训练、模拟仿真训练与综合流程训练实际需求显著高于实际培训时长(P<0.01)。不同人口学特征的参训满意度存在差异,参加过救援任务的队员对培训组织、装备物资保障、统筹准备、教学内容4个维度的满意度得分均显著高于从未参加过救援任务的队员。结论现行的培训体系和参与救援任务均有助于促进救援队员对航空救援事业的了解,但在目前的训练中仍存在专职人员缺位、训练效率偏低、装备配备滞后等问题,无法充分满足现阶段战斗力生成与保障需求,因此迫切需要加快标准化救援队伍建设和训练体系建设,提升分队训练水平和训练效益,提升救援能力。

关键词：航空医疗救援分队训练现状调查影响因素

Spin-Wave Dynamics in an Artificial Kagome Spin Ice

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Chinese Physics Letters 2021年第4期38卷 117-121页

作者： Qiuyang Li Suqin Xiong Lina Chen kaiyuan zhou Rongxin Xiang Haotian Li Zhenyu Gao Ronghua Liu Youwei Du China Electric Power Research Institute Beijing 100192China School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China School of Physics Nanjing UniversityNanjing 210093China

Artificial spin ice(ASI) structures have significant technological potential as reconfigurable metamaterials and magnetic storage *** investigate the field/frequency-dependent magnetic dynamics of a kagome ASI made of 25-nm-thick permalloy nanomagnet elements,combining magnetoresistance(MR) and microscale ferromagnetic resonance(FMR) *** FMR spectra show a broadband absorption spectrum from 0.2 GHz to 3 GHz at H below 0.3 kOe,where the magnetic configuration of the kagome ASI is in the multidomain state,because the external magnetic field is below the obtained coercive field Hc~0.3 kOe,based on both the low-field range MR loops and simulations,suggesting that the low-field magnetization dynamics of kagome ASI is dominated by a multimode resonance ***,the FMR spectra exhibit five distinctive resonance modes at the highfield quasi-uniform magnetization ***,our micromagnetic simulations provide additional spatial resolution of these resonance modes,identifying the presence of two high-frequency primary modes,localized in the horizontal and vertical bars of the ASI,respectively;three other low-frequency modes are mutually exclusive and separately pinned at the corners of the kagome ASI by an edge-induced dipolar *** results suggest that an ASI structural design can be adopted as an efficient approach for the development of low-power filters and magnonic devices.

关键词： alloy magnetization corners

Enhancement of spin-orbit torque efficiency by tailoring interfacial spin-orbit coupling in Pt-based magnetic multilayers

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Chinese Physics B 2022年第9期31卷 146-151页

作者： Wenqiang Wang Gengkuan Zhu kaiyuan zhou Xiang Zhan Zui Tao Qingwei Fu Like Liang Zishuang Li Lina Chen Chunjie Yan Haotian Li Tiejun zhou Ronghua Liu National Laboratory of Solid State Microstructures School of Physics and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China New Energy Technology Engineering Laboratory of Jiangsu Provence and School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Centre for Integrated Spintronic Devices School of Electronics and InformationHangzhou Dianzi UniversityHangzhou 310018China

We study inserting Co layer thickness-dependent spin transport and spin-orbit torques(SOTs)in the Pt/Co/Py trilayers by spin-torque ferromagnetic *** interfacial perpendicular magnetic anisotropy(IPMA)energy density(Ks=2.7 erg/cm^(2),1 erg=10^(-7) J),which is dominated by interfacial spin-orbit coupling(ISOC)in the Pt/Co interface,total effective spin-mixing conductance(G↑↓eff,tot=0.42×10^(15) Ω^(-1)·m^(-2))and two-magnon scattering(βTMS=0.46 nm2)are first characterized,and the damping-like torque(ξDL=0.103)and field-like torque(ξFL=-0.017)efficiencies are also calculated quantitatively by varying the thickness of the inserting Co *** significant enhancement of ξDL and ξFL in Pt/Co/Py than Pt/Py bilayer system originates from the interfacial Rashba-Edelstein effect due to the strong ISOC between Co-3d and Pt-5d orbitals at the Pt/Co ***,we find a considerable out-of-plane spin polarization SOT,which is ascribed to the spin anomalous Hall effect and possible spin precession effect due to IPMA-induced perpendicular magnetization at the Pt/Co *** results demonstrate that the ISOC of the Pt/Co interface plays a vital role in spin transport and *** finds offer an alternative approach to improve the conventional SOTs efficiencies and generate unconventional SOTs with out-of-plane spin polarization to develop low power Pt-based spintronic via tailoring the Pt/FM interface.

关键词： spin-orbit torque interfacial Rashba-Edelstein effect spin-torque efficiency spin-torque ferromagnetic resonance