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Mapping the antiparallel aligned domain rotation by microwave excitation

CHINESE PHYSICS B 2024年第9期33卷 599-605页

作者： Zhang, Jing Cui, Yuanzhi Wang, Xiaoyu Wang, Chuang Liu, Mengchen Xu, Jie Li, Kai Zhao, Yunhe lu, zhenyan Pan, Lining Jin, Chendong Liu, Qingfang Wang, Jianbo Cao, Derang Qingdao Univ Qingdao 266071 Peoples R China Qingdao Univ Natl Demonstrat Ctr Expt Appl Phys Educ Qingdao 266071 Peoples R China Chinese Acad Sci Inst Semicond SKLSM Beijing 100083 Peoples R China Lanzhou Univ Key Lab Special Funct Mat & Struct Design Minist Educ Lanzhou 730000 Peoples R China Northeast Forestry Univ Coll Chem Chem Engn & Resource Utilizat Harbin 150040 Peoples R China Hunan Univ Sci & Technol Sch Phys & Elect Hunan Prov Key Lab Intelligent Sensors & Adv Senso Xiangtan 411201 Peoples R China Chinese Acad Sci Ningbo Inst Mat Technol & Engn Guiyang 315201 Peoples R China Hebei Univ Hebei 071002 Peoples R China Lanzhou Univ Key Lab Magnetism & Magnet Mat Minist Educ Lanzhou 730000 Peoples R China

The evolution process of magnetic domains in response to external fields is crucial for the modern understanding and application of spintronics. In this study, we investigated the domain rotation in stripe domain films of varying thicknesses by examining their response to microwave excitation in four different orientations. The resonance spectra indicate that the rotation field of stripe domain film under an applied magnetic field approaches the field where the resonance mode of sample changes. The saturation field of the stripe domain film corresponds to the field where the resonance mode disappears when measured in the stripe direction parallel to the microwave magnetic field. The results are reproducible and consistent with micromagnetic simulations, providing additional approaches and techniques for comprehending the microscopic mechanisms of magnetic domains and characterizing their rotation.

关键词： stripe domain magnetic film microwave excitation micromagnetic simulation 75.78.-n 75.78.Fg 76.50.+g 75.70.Kw

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夸克物质对称能与夸克星潮汐形变的研究

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原子核物理评论 2024年第1期41卷 325-330页

作者：徐建峰崔磊夏铖君陆振烟宿迁学院文理学院江苏宿迁223800 扬州大学引力与宇宙学研究中心物理科学与技术学院江苏扬州225009 湖南科技大学物理与电子科学学院湖南湘潭411201

近十年的研究表明,夸克物质对称能对夸克物质的状态方程有重要影响。在本研究中,通过采用等效质量模型并在夸克质量标度中引入同位旋依赖项来研究夸克物质的稳定窗口。研究结果表明,足够大的同位旋强度依赖参数C_I可以显著地增大奇异夸... 详细信息

近十年的研究表明,夸克物质对称能对夸克物质的状态方程有重要影响。在本研究中,通过采用等效质量模型并在夸克质量标度中引入同位旋依赖项来研究夸克物质的稳定窗口。研究结果表明,足够大的同位旋强度依赖参数C_I可以显著地增大奇异夸克物质的稳定窗口,从而使计算结果可以同时满足天文观测数据PSR J1614-2230具有1.928±0.017倍太阳质量和双中子星并合事件GW170817中得到的潮汐形变70≤A_(1.4)≤580的约束。与奇异夸克物质的情况相反,u-d夸克物质的稳定窗口会随着同位旋强度依赖参数的增大而减小,从而使u-d夸克星无法支持相应的天文观测数据。最后,发现奇异夸克物质的对称能远大于u-d夸克物质的对称能,并且夸克间的单胶子交换相互作用会导致奇异夸克物质的对称能变软。

关键词：对称能夸克物质夸克星潮汐形变稳定窗口

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Two-flavor quark matter in the perturbation theory with full thermodynamic consistency

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Science China(Physics,Mechanics & Astronomy) 2015年第4期58卷 24-29页

作者： XU JianFeng PENG GuangXiong lu zhenyan CUI ShuaiShuai School of Physics University of Chinese Academy of Sciences Institute of High Energy Physics Chinese Academy of Science

Direct extrapolation of the strong interaction between quarks in pure perturbative calculation has a problem of thermodynamic inconsistency. A new term determined by thermodynamic consistency requirement could resolve it. This new term plays an important role at lower density in describing the equation of state of quark matter, while it is negligible at high density. Accordingly, the density behavior of the sotmd velocity becomes more reasonable, and the maximum mass of quark stars can be as large as two times the solar mass.

关键词： perterbative QCD quark model thermodynamic consistency

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Density isomer of nuclear matter in an equivalent mass approach

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Nuclear Science and Techniques 2013年第5期24卷 24-30页

作者： GAO Li 2lu zhenyan PENG Guangxiong College of Physics University of Chinese Academy of Sciences Department of Physics Shandong University of Technology Theoretical Physics Center for Science Facilities Institute of High Energy Physics

The equation of state of symmetric nuclear matter is studied with an equivalent mass *** equivalent mass of a nucleon has been expanded to order 4 in *** first determine the first-order expansion coefficient in the quantum hadron dynamics,then calculate the coefficients of the second to fourth order for the given binding energy and incompressibility at the normal nuclear saturation *** is found that there appears a density isomeric state if the incompressibility is smaller than a critical *** model dependence of the conclusion has also been checked by varying the first-order coefficient.

关键词：核物质状态方程饱和密度质量方针异构体等效量子强子动力学质量模型膨胀系数

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流体阻力和抛射高度对抛射体运动规律的影响研究

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物理通报 2024年第2期 27-30,34页

作者：易婉周琪陆振烟麻志君周海霞湖南科技大学物理与电子科学学院湖南湘潭411201 智能传感器与新型传感材料湖南省重点实验室湖南湘潭411201

从动力学方程出发,定量分析阻力大小和抛射高度对抛体运动最佳抛射角的影响.结果表明,阻力系数不为零且给定抛射高度时,最佳抛射角先是随初速度的增加而急剧上升,到达某一个极大值后转为平缓地单调下降.而当阻力系数保持不变时,最佳抛... 详细信息

从动力学方程出发,定量分析阻力大小和抛射高度对抛体运动最佳抛射角的影响.结果表明,阻力系数不为零且给定抛射高度时,最佳抛射角先是随初速度的增加而急剧上升,到达某一个极大值后转为平缓地单调下降.而当阻力系数保持不变时,最佳抛射角随初速度的变化行为与抛射高度密切相关.但不管阻力系数和抛射高度取任何非负值,抛体运动最佳抛射角均小于45°.另外,在其他参量保持不变的前提下,抛体运动最佳抛射角均是随抛射高度和阻力系数的增大而单调减小.

关键词：抛体运动阻力抛射高度最佳抛射角

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颅内动脉瘤破裂伴血肿夹闭术预后模型构建

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中国现代医生 2024年第21期62卷 21-25页

作者：郭晓竑方军康陆珍燕武弋洪鹏超方小康东阳市人民医院神经外科浙江东阳322100

目的探究颅内动脉瘤破裂伴血肿患者夹闭术后预后不良的影响因素并构建临床预测模型。方法选取2017年9月至2023年10月东阳市人民医院收治的151例动脉瘤性颅内血肿患者。术后3个月,采用改良Rankin量表(modified Rankin scale,mRS)进行评... 详细信息

目的探究颅内动脉瘤破裂伴血肿患者夹闭术后预后不良的影响因素并构建临床预测模型。方法选取2017年9月至2023年10月东阳市人民医院收治的151例动脉瘤性颅内血肿患者。术后3个月,采用改良Rankin量表(modified Rankin scale,mRS)进行评分分组,预后良好组93例,预后不良组58例。采用单因素分析和多因素Logistic回归分析探究影响患者术后预后不良的风险因素,构建颅内动脉瘤破裂伴血肿患者夹闭术后预后不良预测模型,采用受试者操作特征曲线下面积(area under the curve,AUC)反映模型的鉴别效度,采取Hosmer-Lemeshow检验建立模型的拟合度。结果Hunt-Hess分级Ⅳ~Ⅴ级(OR=5.339)、改良Fisher分级Ⅲ~Ⅳ级(OR=5.145)、血肿量≥50ml(OR=7.426)、血肿清除率≤50%(OR=8.381)、责任动脉瘤直径>5mm(OR=3.053)、手术时间窗>5h(OR=2.659)、术中血管区操作时间>3h(OR=2.305)为颅内破裂动脉瘤伴血肿患者夹闭术后预后不良的独立风险因素(P5mm、手术时间窗>5h、术中血管区操作时间>3h为颅内动脉瘤破裂伴血肿患者夹闭术后预后不良的风险因素。本研究构建的模型预测效能较高,可为临床开颅夹闭术患者治疗及术后康复提供指导。

关键词：颅内动脉瘤破裂血肿开颅夹闭术预后模型构建

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Fast Cross-Platform Binary Code Similarity Detection Framework Based on CFGs Taking Advantage of NLP and Inductive GNN

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Chinese Journal of Electronics 2024年第1期33卷 128-138页

作者： Jinxue PENG Yong WANG Jingfeng XUE zhenyan LIU School of Computer Science and Technology Beijing Institute of Technology

Cross-platform binary code similarity detection aims at detecting whether two or more pieces of binary code are similar or not. Existing approaches that combine control flow graphs(CFGs)-based function representation and graph convolutional network(GCN)-based similarity analysis are the best-performing ones. Due to a large amount of convolutional computation and the loss of structural information, the use of convolution networks will inevitably bring problems such as high overhead and sometimes inaccuracy. To address these issues, we propose a fast cross-platform binary code similarity detection framework that takes advantage of natural language processing(NLP)and inductive graph neural network(GNN) for basic blocks embedding and function representation respectively by simulating extracting structural features and temporal features. GNN’s node-centric and small batch is a suitable training way for large CFGs, it can greatly reduce computational overhead. Various NLP basic block embedding models and GNNs are evaluated. Experimental results show that the scheme with long short term memory(LSTM)for basic blocks embedding and inductive learning-based Graph SAGE(GAE) for function representation outperforms the state-of-the-art works. In our framework, we can take only 45% overhead. Improve efficiency significantly with a small performance trade-off.

关键词： Training Semantics Process control Binary codes Feature extraction Natural language processing Graph neural networks

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秩序的重建:1940年代的中国与世界跨国史论坛综述

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抗日战争研究 2023年第2期 139-145,M0004页

作者：陆祯严复旦大学历史学系

2023年3月25—26日,秩序的重建:1940年代的中国与世界跨国史论坛在复旦大学召开。本次论坛由中国社会科学院近代史研究所《抗日战争研究》编辑部、复旦大学历史学系联合主办,首都师范大学历史学院协办。来自中国社会科学院、北京大学、... 详细信息

2023年3月25—26日,秩序的重建:1940年代的中国与世界跨国史论坛在复旦大学召开。本次论坛由中国社会科学院近代史研究所《抗日战争研究》编辑部、复旦大学历史学系联合主办,首都师范大学历史学院协办。来自中国社会科学院、北京大学、清华大学、复旦大学、浙江大学、南京大学、中国人民大学、首都师范大学等国内30余所科研机构和高等院校的70余位学者参会。本次论坛旨在打通历史学与国际关系学、国际政治研究的边界。与会学者立足跨国史视角.

关键词：首都师范大学科研机构中国人民大学中国社会科学院南京大学国际政治研究复旦大学高等院校

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The suitability assessment on site selection for bottom seeding scallop culture based on analytic hierarchy process

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Journal of Oceanology and Limnology 2024年第2期42卷 647-663页

作者： Ziniu ZHANG zhenyan WANG Guihua LI Meihan ZHAO Wenjian LI School of Earth Sciences and Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Mineral Resources National Laboratory for Marine Science and TechnologyQingdao 266237China University of Chinese Academy of Sciences Beijing 100049China

Scallop culture is an important way of bottom-seeding marine ranching,which is of great significance to improve the current situation of fishery ***,there are some problems in site-selection evaluation of marine ranching,such as imperfect criteria system,complex structure,untargeted criteria quantification,*** addition,no site-selection evaluation method of bottom-seeding culture areas for scallops is ***,we established a hierarchy structure model according to the analytic hierarchy process(AHP)theory,in which social,physical,chemical,and biological environments are used as main criteria,and marine functional zonation,water depth,current,water temperature,salinity,substrate type,water quality,sediment quality,red tide,phytoplankton,and zooplankton are used as sub-criteria,on which a multi-parameter evaluation system is set ***,the dualism method,assignment method,and membership function method were used to quantify sub-criteria,and a quantitative evaluation for the entire criteria was added,including the evaluation and analysis of two types of unsuitable environmental *** overall consideration in scallop yield,quality,and marine ranching construction objectives,the weight of the main criteria could be *** grades in the suitability corresponding to the evaluation result were divided,and the Python language was used to create an evaluation system for efficient calculation and intuitive presentation of the evaluation *** marine cases were simulated based on existing survey data,and the results prove that the method is feasible for evaluating and analyzing the site selection of bottom-seeding culture areas for scallops under various environmental *** proposed evaluation method can be promoted for the site selection of bottom-seeding marine *** study provided theoretical and methodological references for the site selection evaluation of other types of marine ranching.

关键词： marine ranching bottom-seeding scallops site selection evaluation analytic hierarchy process evaluation system

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An Asymmetric Galactic Stellar Disk Traced by OB-type Stars from LAMOST DR7

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Research in Astronomy and Astrophysics 2024年第6期24卷 38-51页

作者： Xiaopeng Liu Hao Tian Wenyuan Cui Linlin Li Jiaming Liu zhenyan Huo Yawei Gao Department of Physics Hebei Normal UniversityShijiazhuang 050024China Guo Shoujing Institute for Astronomy Hebei Normal UniversityShijiazhuang 050024China Key Laboratory of Space Astronomy and Technology National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China

Using 9943 OB-type stars from LAMOST DR7 in the solar neighborhood,we fit the vertical stellar density profile with the model including a single exponential distribution at different positions(R,Φ).The distributions of the scale heights and scale length show that the young disk traced by the OB-type stars is not *** scale length decreases versus the azimuthal angleΦ,i.e.,from.■kpc withΦ=-3°to■kpc withΦ=9°.Meanwhile we find signal of non-symmetry in the distribution of the scale height of the north and south of the disk *** scale height in the north side shows signal of flaring of the disk,while that of the south disk stays almost constant around h_(s)=130 *** distribution of the displaceeent of the disk plane Z_(0)also shows variance versus the azimuthal angleΦ,which displays significant differences with the warp model constrained by the Cepheid *** also test different values for the position of the Sun,and the distance between the Sun and the Galactic center affects the scale heights and the displacement of the disk significantly,but that does not change our conclusion that the disk is not axisymmetric.

关键词： Galaxy:disk galaxies:spiral stars:early-type stars:massive

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