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Spin transport of half-metal Mn_(2)X_(3) with high Curie temperature:An ideal giant magnetoresistance device from electrical and thermal drives

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Frontiers of physics 2024年第4期19卷 125-135页

作者： Bin Liu Xiaolin Zhang Jingxian Xiong xiuyang pang Sheng Liu Zixin Yang Qiang Yu Honggen Li Sicong Zhu Jian Wu Hubei Province Key Laboratory of Systems Science in Metallurgical Process The State Key Laboratory for Refractories and MetallurgyCollaborative Innovation Center for Advanced SteelsInternational Research Institute for Steel TechnologyWuhan University of Science and TechnologyWuhan 430081China Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education and School of Physical and Technology Wuhan UniversityWuhan 430072China College of Advanced Interdisciplinary Studies Nanhu Laser LaboratoryNational University of Defense TechnologyChangsha 410073China Department of Mechanical Engineering National University of SingaporeSingapore 117575Singapore i-Lab&Key Laboratory of Nanodevices and Applications&Key Laboratory of Nanophotonic Materials and Devices Suzhou Institute of Nano-Tech and NanoBionicsChinese Academy of SciencesSuzhou 215123China Institute of Optical Science and Technology School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China

Currently,magnetic storage devices are encountering the problem of achieving lightweight and high integration in mobile computing devices during the information *** a result,there is a growing urgency for twodimensional half-metallic materials with a high Curie temperature(TC).This study presents a theoretical investigation of the fundamental electromagnetic properties of the monolayer hexagonal lattice of Mn_(2)X_(3)(X=S,Se,Te).Additionally,the potential application of Mn_(2)X_(3) as magneto-resistive components is *** three of them fall into the category of ferromagnetic *** particular,the Monte Carlo simulations indicate that the TC of Mn2S3 reachs 381 K,noticeably greater than room *** findings present notable advantages for the application of Mn2S3 in spintronic ***,a prominent spin filtering effect is apparent when employing non-equilibrium Green’s function simulations to examine the transport *** resulting current magnitude is approximately 2×10^(4) nA,while the peak gigantic magnetoresistance exhibits a substantial value of 8.36×10^(16)%.It is noteworthy that the device demonstrates a substantial spin Seebeck effect when the temperature differential between the electrodes is *** brief,Mn_(2)X_(3) exhibits outstanding features as a highTC half-metal,exhibiting exceptional capabilities in electrical and thermal drives spin ***,it holds great potential for usage in spintronics applications.

关键词： half-metals Mn_(2)X_(3) high Curie temperature electrical and thermal GMR

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Predicting Users’ Latent Suicidal Risk in Social Media: An Ensemble Model Based on Social Network Relationships

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Computers, Materials & Continua 2024年第6期79卷 4259-4281页

作者： xiuyang Meng Chunling Wang Jingran Yang Mairui Li Yue Zhang Luo Wang School of Information Science and Technology Beijing Forestry UniversityBeijing100083China Engineering Research Center for Forestry-Oriented Intelligent Information Processing of National Forestry and Grassland Administration Beijing100083China

Suicide has become a critical concern,necessitating the development of effective preventative *** media platforms offer a valuable resource for identifying signs of suicidal *** progress in detecting suicidal ideation on social media,accurately identifying individuals who express suicidal thoughts less openly or infrequently poses a significant *** tackle this,we have developed a dataset focused on Chinese suicide narratives from Weibo’s Tree Hole feature and introduced an ensemble model named Text Convolutional Neural Network based on Social Network relationships(TCNN-SN).This model enhances predictive performance by leveraging social network relationship features and applying correction factors within a weighted linear fusion *** is specifically designed to identify key individuals who can help uncover hidden suicidal users and *** model,assessed using the bespoke dataset and benchmarked against alternative classification approaches,demonstrates superior accuracy,F1-score and AUC metrics,achieving 88.57%,88.75%and 94.25%,respectively,outperforming traditional TextCNN models by 12.18%,10.84%and 10.85%.We assert that our methodology offers a significant advancement in the predictive identification of individuals at risk,thereby contributing to the prevention and reduction of suicide incidences.

关键词： Suicide risk prediction social media social network relationships Weibo Tree Hole deep learning

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数字经济背景下虚增信用行为刑法应对的反思

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政治与法律 2024年第8期 45-63页

作者：左袖阳北京市社会科学院北京100101

数字经济的虚拟性、无界性特点,造成交易参与者之间天然存在信任危机。信用评价体系作为危机解决方案之一,成为维系卖方、买方和平台之间信任关系的重要渠道。出于惩罚虚增信用的考虑,存在司法入罪论、立法入罪论两种对立的应对主张。... 详细信息

数字经济的虚拟性、无界性特点,造成交易参与者之间天然存在信任危机。信用评价体系作为危机解决方案之一,成为维系卖方、买方和平台之间信任关系的重要渠道。出于惩罚虚增信用的考虑,存在司法入罪论、立法入罪论两种对立的应对主张。但司法入罪论在违法构成和法益定位上不符合虚增信用行为;立法入罪论虽然在侵害本体结论上正确,但没有考虑到信用评价业务法益的自我保护能力和信用评价体系内在缺陷的救济容忍问题。考虑到互联网时代刑法控制论的变革和刑法的补充性原则,以刑法手段治理虚增信用不仅可能因无法化解遵守禁令与生存的矛盾而无功,而且可能会对社会子系统自我治理的积极性形成遏制。因此应特别慎重考虑虚增信用行为的刑法应对,将重心置于非刑事法律手段的完善。

关键词：数字经济虚增信用刑法应对反思

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Occurrence and Reduction of Hepatitis B Vaccine Hesitancy Among Medical University Students—Shanxi Province,China,2020

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China CDC weekly 2024年第19期6卷 431-436,I0005-I0007页

作者： Huijuan Kong Xufeng Cui Ying Zhang Qiang Xue Jing Shi Tian Yao Yana Guo xiuyang Xu Suping Wang Yongliang Feng School of Public Health Shanxi Medical UniversityTaiyuan CityShanxi ProvinceChina Center of Clinical Epidemiology and Evidence Based Medicine Shanxi Medical UniversityTaiyuan CityShanxi ProvinceChina Key Laboratory of Coal Environmental Pathogenicity and Prevention(Shanxi Medical University) Ministry of EducationTaiyuan CityShanxi ProvinceChina First Hospital/First Clinical Medical College of Shanxi Medical University Taiyuan CityShanxi ProvinceChina

Summary What is already known about this topic?Previous research has primarily examined the issue of hepatitis B vaccine hesitancy in migrant workers and other adult ***,there is a lack of studies that have specifical... 详细信息

关键词： Shanxi primarily workers

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Exploring the Path of Implementing the Home-School Co-education Model from the Perspective of Moral Education Field

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Asian Agricultural Research 2024年第5期16卷 36-41页

作者： Li WU xiuyang WANG Dandan CHEN Qiuyun WANG Lixia CHEN Faculty of Teacher Education Zhaoqing UniversityZhaoqing 526060China School of Education Zhaoqing UniversityZhaoqing 526060China School of Foreign Studies Zhaoqing UniversityZhaoqing 526060China

As a social psychological field derived from the concept of physical field,the moral education field plays a very important role in guiding the construction of a home-school co-education *** this paper,by analyzing the internal power system of the moral education field,with a policy oriented approach and combined with contemporary factors,it aims to empower the traditional home-school co-education *** by combining home education and school education,supplemented by social policy guidance,strengthening the construction of the"trinity"community,creating a harmonious and stable ecological interactive moral education field,expanding the path of home-school cooperation,strengthening the boundary of home and school responsibility,and innovating the form of home-school co-education,can it support the bright future of education.

关键词： Primary and secondary schools Moral education Home-school co-education

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Underwater wireless optical NOMA communication experiment system exploiting GaN-based micro-LED array grouping

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Chinese Optics Letters 2024年第3期22卷 1-6页

作者：梁彦军殷洪玺黄安季秀阳王建英 School of Information and Communication Engineering Dalian University of TechnologyDalian 116024China

This paper has proposed an experimental system for non-orthogonal multiple access(NOMA)wireless optical communication in challenging underwater turbulent environments,employing the gallium nitride(GaN)-based micro-LED *** design of the GaN-based micro-LED array enables the independent transmission of signals from distinct data streams within the NOMA framework,facilitating direct optical power-domain superposition of NOMA *** experimental setup involves emulating oceanic turbulence channels,characterized by varying the level of scintillation intensity,to thoroughly investigate the bit error rate(BER)*** outcomes unequivocally demonstrate the superiority of our proposed NOMA scheme,as compared to conventional circuit-driven optical NOMA systems utilizing fixed LED array grouping,particularly in the presence of turbulent underwater *** proposed NOMA scheme exhibits consistently superior BER performance and maintains excellent linearity at the lower frequencies while effectively mitigating signal distortion at the higher frequencies.

关键词： optical non-orthogonal multiple access gallium nitride-based micro-LED array oceanic turbulence channels bit error rate

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Half-precessional cycle revealed by environment magnetism of stalagmite in Shizhu Cave from southwestern China during the Last Glacial

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Journal of Earth Science 2024年

作者： Huihui Yang Yu-Min Chou xiuyang Jiang Wenyue Xia Hai Li Yi Zhong Jingyu Zhang Yaoqi He Tsai-Luen Yu Qingsong Liu Chuan-Chou Shen College of Tourism and Air Service Guizhou Minzu University Research Center for Future Earth Taiwan University Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) School of Environment Harbin Institute of Technology High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC) Department of Geosciences Taiwan University Key Laboratory of Humid Subtropical Eco-Geographical Processes College of Geography Science Fujian Normal University Center for Marine Magnetism (CM2) Department of Ocean Science and Engineering Southern University of Science and Technology

The environmental magnetic proxies of stalagmites hold significant potential for reconstructing regional hydroclimate changes by revealing the content and grain size of magnetic particles within stalagmites. In this study， we present the contents and grain sizes of magnetic particles within a stalagmite SZ-1， from Shizhu Cave in southwestern China from 70.4 to 22.3 thousand years ago (ka) during the last glacial period. Specifically， the parameters IRMsoft， soil-derived magnetic minerals， and ARM/SIRM (anhysteretic remanent magnetization/saturation isothermal remanent magnetization)， the ratio of fine magnetic particles to total ferrimagnetic particles preserved in stalagmite SZ-1， indicate the fluctuation of regional precipitation. Obvious half-precessional cycles are evident in these two proxies， indicating that hydroclimatic variations in southwestern China may predominantly arise from the heat and moisture transported from tropical oceans. These variations are likely influenced by shifts in the Intertropical Convergence Zone and fluctuations in the Asian summer monsoon.

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踏面匹配与初始裂纹形态交互作用下车轮多轴疲劳裂纹扩展特性

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材料导报 2024年第4期38卷 187-191页

作者：黄奎龙余刚方修洋张昊楠西南交通大学机械工程学院成都610031 江西科技学院人工智能学院南昌330096

地铁车辆车轮裂纹常萌生于车轮踏面及亚表面,亚表面裂纹是影响车轮寿命的关键因素之一。借助有限元仿真方法,在轮轨接触三维模型亚表面处插入初始裂纹,研究了不同轮轨匹配形式、不同初始裂纹形态对亚表面疲劳裂纹扩展特性的影响。结果显... 详细信息

地铁车辆车轮裂纹常萌生于车轮踏面及亚表面,亚表面裂纹是影响车轮寿命的关键因素之一。借助有限元仿真方法,在轮轨接触三维模型亚表面处插入初始裂纹,研究了不同轮轨匹配形式、不同初始裂纹形态对亚表面疲劳裂纹扩展特性的影响。结果显示,车轮亚表面3 mm处接触应力数值最大,在锥形、LM型、LMA型三种踏面类型中,采用LM型踏面时车轮亚表面等效应力最大,最容易发生疲劳破坏;裂纹扩展均呈现出多轴疲劳裂纹扩展特性,锥形踏面工况下裂纹的扩展速率高于其余两种踏面类型下的裂纹扩展速率;不同初始裂纹角度中,45°初始裂纹角度是最危险的角度;初始裂纹深度对裂纹的扩展路径基本无影响。本研究结果对车轮亚表面埋藏裂纹缺陷评判及剩余寿命预测有一定的工程及理论指导意义。

关键词：车轮轮轨型面匹配初始裂纹亚表面疲劳裂纹扩展

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Snβ制备工艺对其催化果糖转化生成乳酸甲酯性能的影响

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高校化学工程学报 2024年第1期38卷 105-112页

作者：蒋雨希魏茜文任傲天吕喜蕾吕秀阳浙江大学生物质化工教育部重点实验室浙江大学化学工程与生物工程学院浙江杭州310058 浙江恒逸石化研究院有限公司浙江杭州311209

乳酸甲酯(MLA)是重要的生物质基平台化合物。Snβ分子筛催化生物质糖醇解制备MLA技术具有重要的工业化应用前景。针对Snβ分子筛催化剂制备工艺对其活性和重复使用性能影响的研究非常不系统、不全面等问题,详细考察了Snβ分子筛催化剂... 详细信息

乳酸甲酯(MLA)是重要的生物质基平台化合物。Snβ分子筛催化生物质糖醇解制备MLA技术具有重要的工业化应用前景。针对Snβ分子筛催化剂制备工艺对其活性和重复使用性能影响的研究非常不系统、不全面等问题,详细考察了Snβ分子筛催化剂制备过程中脱铝、浸渍和焙烧等3步的工艺参数对其结构及催化果糖转化生成MLA性能的影响。结果表明,Snβ分子筛制备过程中市售Hβ分子筛脱铝步骤需要强酸,其中硝酸较佳;Hβ分子筛的硅铝比(物质的量比(n(Si):n(Al))、酸处理过程中酸浓度、浸渍液中SnCl_(2)浓度和焙烧温度都存在较佳条件,具体为:以n(Si):n(Al)=60的Hβ分子筛为原料、经质量分数为47%的HNO_(3)脱铝、再在浓度为0.1 mol·L^(-1)的SnCl_(2)乙醇溶液中浸渍、最后在550℃下焙烧得到的催化剂具有较佳的反应活性,用该催化剂180℃下催化果糖反应6 h时MLA收率最高可达53.6%;此外,该催化剂还具有良好的重复使用性能;表征结果显示,采用上述工艺制备的催化剂,Sn可以进入β分子筛骨架。本研究可为生物质非均相催化醇解制备MLA技术的工业化提供参考。

关键词：果糖乳酸甲酯 Snβ分子筛催化剂制备工艺

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用于产生红外脉冲的碲烯纳米片的化学气相输运生长

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中国激光 2023年第1期50卷 230-237页

作者：庞修洋赵新新俞强邓海芹刘方奇张严殳博王贤天浩朱思聪吴坚侯义锋张凯姜宗福国防科技大学前沿交叉学科学院脉冲功率激光技术国家重点实验室高能激光技术湖南省重点实验室湖南长沙410073 中国科学院苏州纳米技术与纳米仿生研究所创新实验室纳米器件与应用重点实验室纳米光子材料与器件重点实验室江苏苏州215123 武汉科技大学耐火材料和冶金学国家重点实验室湖北武汉430081 上海交通大学物理与天文学院上海200240 梧州学院电子与信息工程学院广西梧州543001

碲烯具有宽带吸收、高迁移率和独特的拓扑性质,在红外光学应用领域被寄予厚望。本团队利用化学气相输运方法制备了高结晶性碲烯纳米片;结合精准的端面转移技术,获得了利于光纤集成的可饱和吸收体;基于碲烯的非线性饱和吸收特性,在1.55μ... 详细信息

碲烯具有宽带吸收、高迁移率和独特的拓扑性质,在红外光学应用领域被寄予厚望。本团队利用化学气相输运方法制备了高结晶性碲烯纳米片;结合精准的端面转移技术,获得了利于光纤集成的可饱和吸收体;基于碲烯的非线性饱和吸收特性,在1.55μm波段实现了稳定的被动调Q脉冲输出,中心波长约为1558 nm,脉冲宽度约为1.44μs,重复频率在87~133 kHz范围内可调。本研究结果拓展了新型碲烯纳米材料的应用场景,为可调谐脉冲激光提供了解决方案。

关键词：激光器纳米材料可饱和吸收体被动调Q 可调谐脉冲激光碲烯

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