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Unravelling the anisotropic light-matter interaction in strainengineered trihalide MoCl_(3)

Nano Research 2024年第4期17卷 2981-2987页

作者： Yuxuan Sun Ziang Liu Zeya Li Feng Qin Junwei Huang Caiyu Qiu hongtao yuan National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210000China

Layered trihalides exhibit distinctive band structures and physical properties due to the sixfold coordinated 3d or 4d transition metal site and partially occupied d orbitals,holding great potential in condensed matter physics and advanced electronic *** research focused on trihalides with highly symmetric honeycomb-like structures,such as CrI3 andα-RuCl_(3),while the role of crystal anisotropy in trihalides remains *** particular,the trihalide MoCl_(3) manifests strong in-plane crystal anisotropy with the largest difference in Mo–Mo interatomic *** on such material is imperative to address the lack of investigations on the effect of anisotropy on the properties of ***,we demonstrated the anisotropy of MoCl_(3) through polarized Raman spectroscopy and further tuned the phonon frequency via strain *** showed the Raman intensity exhibits twofold symmetry under parallel configuration and fourfold symmetry under perpendicular configuration with changing the polarization angle of incident ***,we found that the phonon frequencies of MoCl_(3) decrease gradually and linearly with applying uniaxial tensile strain along the axis of symmetry in the MoCl_(3) crystal,while those frequencies increase with uniaxial tensile strain applied *** results shed light on the manipulation of anisotropic light-matter interactions via strain engineering,and lay a foundation for further exploration of the anisotropy of trihalides and the modulation of their electronic,optical,and magnetic properties.

关键词： layered trihalide MoCl_(3) polarized Raman spectroscopy strain engineering anisotropy

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Gate Tunable Labyrinth Domain Structures in a van der Waals Itinerant Ferromagnet Cr_(7)Te_(8)

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Chinese Physics Letters 2024年第9期41卷 122-132页

作者： Kui Meng Zeya Li Yicheng Shen Xiangyu Bi Junhao Rao Yuting Qian Zhansheng Gao Peng Chen Caiyu Qiu Feng Qin Jinxiong Wu Feng Luo Junwei Huang hongtao yuan National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210000China Center for the Physics of Low-Dimensional Materials Henan Joint International Research Laboratory of New Energy Materials and DevicesSchool of Physics and ElectronicsHenan UniversityKaifeng 475004China Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional MaterialsSmart Sensor Interdisciplinary Science CenterSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China

Manipulating magnetic domain structure plays a key role in advanced spintronics *** rationale is that the labyrinthine domain structure,normally appearing in ferromagnetic thin films with strong magnetic anisotropy,shows a great potential to increase data storage density for designing magnetic nonvolatile memory and logic ***,an electrical control of labyrinthine domain structure remains ***,we demonstrate the gate-driven evolution of labyrinthine domain structures in an itinerant ferromagnet Cr_(7)Te_(8).By combining electric transport measurements and micromagnetic finite difference simulations,we find that the hysteresis loop of anomalous Hall effect in Cr_(7)Te_(8)samples shows distinct features corresponding to the generation of labyrinthine domain *** labyrinthine domain structures are found to be electrically tunable via Li-electrolyte gating,and such gate-driven evolution in Cr_(7)Te_(8)originates from the reduction of the magnetic anisotropic energy with gating,revealed by our micromagnetic *** results on the gate control of anomalous Hall effect in an itinerant magnetic material provide an opportunity to understand the formation and evolution of labyrinthine domain structures,paving a new route towards electric-field driven spintronics.

关键词： rational electrolyte ferromagnetic

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基于Hadoop平台的分布式文件云存储系统设计

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软件 2024年第6期45卷 172-174页

作者：袁宏涛天津商务职业学院天津300350

数据量的激增促进了分布式文件系统的迅速发展,Hadoop作为一个开源框架,以其高效的数据存储与处理能力在分布式系统中占据重要地位。通过Hadoop Distributed File System(HDFS)实现大规模数据集的分布式存储,YARN为资源管理提供了弹性调... 详细信息

数据量的激增促进了分布式文件系统的迅速发展,Hadoop作为一个开源框架,以其高效的数据存储与处理能力在分布式系统中占据重要地位。通过Hadoop Distributed File System(HDFS)实现大规模数据集的分布式存储,YARN为资源管理提供了弹性调度,使得Hadoop成为处理大数据问题的理想平台。本文探讨了基于Hadoop平台的分布式文件云存储系统设计,旨在提供一种高效可靠的分布式文件云存储解决方案,以支持大数据时代下的数据存储与处理需求。

关键词： Hadoop平台分布式文件云存储系统系统设计

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基于CFD的汽车运输滚装船参数横摇与减摇研究

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船舶工程 2024年第2期46卷 34-39页

作者：朱璇窦培林袁洪涛刘明琛张文江苏科技大学船舶与海洋工程学院江苏镇江212003 上海外高桥造船有限公司上海200137

为探究船舶参数横摇发生条件,以一艘汽车运输滚装船为研究对象,采用计算流体力学(CFD)软件STAR-CCM+建立虚拟水池并进行数值模拟。通过模拟静水中船舶横摇自由衰减,计算出船舶的横摇固有周期;采用控制变量法分别探究波高、波长、航速和... 详细信息

为探究船舶参数横摇发生条件,以一艘汽车运输滚装船为研究对象,采用计算流体力学(CFD)软件STAR-CCM+建立虚拟水池并进行数值模拟。通过模拟静水中船舶横摇自由衰减,计算出船舶的横摇固有周期;采用控制变量法分别探究波高、波长、航速和遭遇频率等对船舶参数横摇的影响;为该船设计并搭载减摇水舱,分析减摇水舱对参数横摇的抑制效果。结果表明:在迎浪规则波中,当波浪达到一定高度,且波浪遭遇频率为船舶横摇固有频率的2倍时,该船的参数横摇最为剧烈;当减摇水舱固有周期等于该船的横摇固有周期时,减摇水舱对参数横摇现象有较好的抑制效果。

关键词：计算流体动力学汽车运输滚装船参数横摇减摇水舱

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基于船体变形数值仿真的FPSO管道应力分析

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造船技术 2024年第3期52卷 25-30,70页

作者：卜宗儒窦培林袁洪涛王超江苏科技大学船舶与海洋工程学院江苏镇江212100 上海外高桥造船有限公司上海200137

为区别于传统经验公式计算管道应力的方法,采用有限元方法计算浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)船体变形,提取具体管道支架的位移值,并利用CAESARⅡ软件进行管道应力计算。有限元预报得到的管道应... 详细信息

为区别于传统经验公式计算管道应力的方法,采用有限元方法计算浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)船体变形,提取具体管道支架的位移值,并利用CAESARⅡ软件进行管道应力计算。有限元预报得到的管道应力更加准确,而经验公式得到偏保守的结果。建议在对FPSO管道进行初步设计时可采用经验公式方法,在进行详细设计和局部管道应力校核时可采用数值仿真方法。

关键词：浮式生产储卸油装置管道应力分析船体变形数值仿真有限元经验公式

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2016—2017年中国7~17岁儿童青少年血压异常现况——4种标准比较

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卫生研究 2024年第4期53卷 532-539,560页

作者：李彧格苑弘弢蔡姝雅李福胜南晶杨宇祥朴玮赵丽云于冬梅中国疾病预防控制中心营养与健康所北京100050 国家卫生健康委公共营养与健康重点实验室北京100050

目的基于2017年美国儿科协会(American Academy of Pediatrics,AAP)的《儿童青少年高血压筛查和管理临床实践指南》(美国AAP标准)、国际儿童青少年血压偏高百分位参考值(国际标准)、中华人民共和国卫生行业标准《7岁~18岁儿童青少年血... 详细信息

目的基于2017年美国儿科协会(American Academy of Pediatrics,AAP)的《儿童青少年高血压筛查和管理临床实践指南》(美国AAP标准)、国际儿童青少年血压偏高百分位参考值(国际标准)、中华人民共和国卫生行业标准《7岁~18岁儿童青少年血压偏高筛查界值(WS/T 610—2018)》(行业标准)以及《中国高血压防治指南(2018年修订版)》(指南标准),描述及分析2016—2017年中国7~17岁儿童青少年各年龄组正常高值血压和血压偏高检出率,并对4种判定标准进行一致性检验。方法数据来源于2016—2017年中国儿童与乳母营养健康监测,该调查采用多阶段分层整群抽样方法,从31个省(自治区、直辖市)的275个监测点中抽取调查对象,经数据清理共纳入7~17岁研究对象67231名。血压测量采用电子血压计在同一时点重复测量3次的血压均数分别作为研究对象的收缩压及舒张压。为与抽样设计方法相匹配,采用国家统计局提供的第六次人口普查数据对结果进行加权调整,考虑各层抽样权重。结果中国7~17岁儿童青少年正常高值血压检出率由高到低依次为美国AAP标准(20.15%)>指南标准(17.29%)>行业标准(13.14%)>国际标准(12.66%),血压偏高检出率由高到低依次为指南标准(24.31%)>国际标准(21.34%)>美国AAP标准(20.59%)>行业标准(19.96%)。检出率随年龄的升高而下降。结论尽管美国AAP标准和国际标准与我国两项标准的一致性均为中高度一致,但检出率差异较大,考虑到种族差异,在应用国外标准判断我国儿童青少年血压情况时应持谨慎态度。

关键词：血压儿童青少年营养监测

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Gate-tunable spin valve effect in Fe_(3)GeTe_(2)-based van der Waals heterostructures

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InfoMat 2023年第3期5卷 1-10页

作者： Ling Zhou Junwei Huang Ming Tang Caiyu Qiu Feng Qin Caorong Zhang Zeya Li Di Wu hongtao yuan National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjingthe People's Republic of China

Magnetic tunnel junctions(MTJs),a prominent type of spintronic device based on the spin valve effect,have facilitated the development of numerous spintronic *** technical appeal for the next-generation MTJ devices has been proposed in two directions:improving device performance by utilizing advanced two-dimensional(2D)ferromagnetic materials or extending device functionalities by exploring the gate-tunable magnetic properties of *** on the recent development of 2D magnets with the ease of external stimuli,such as electric field,due to their reduced dimensions,reliable prospects for gate-tunable MTJ devices can be achieved,shedding light on the great potential of next-generation MTJs with multiple functionalities for various application *** the electrical gate-tunable MTJ device is highly desirable for practical spintronic devices,it has not yet been ***,we demonstrate the experimental realization of a spin valve device by combining a vertical Fe_(3)GeTe_(2)/h-BN/Fe_(3)GeTe_(2) MTJ with an electrolyte *** magnetoresistance ratio(MR ratio)of 36%for the intrinsic MTJ confirms the good performance of the *** electrolyte gating,the tunneling MR ratio of Fe_(3)GeTe_(2)/h-BN/Fe_(3)GeTe_(2) MTJ can be elevated 2.5 times,from 26%to 65%.Importantly,the magnetic fields at which the magnetoresistance switches for the MTJ can be modulated by electrical gating,providing a promising method to control the magnetization configuration of the *** work demonstrates a gate-tunable MTJ device toward the possibility for gate-controlled spintronic devices,paving the way for performing 2D magnetism manipulations and exploring innovative spintronic applications.

关键词： Fe_(3)GeTe_(2)magnetic tunnel junction magnetoresistance spin valve van der Waals heterostructure

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导管消融术治疗老年持续性心房颤动的疗效分析

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中华老年心脑血管病杂志 2024年第3期26卷 267-270页

作者：孙瑜黄金焕谢鹏国建萍苑洪涛时向民郭红阳黄亚单兆亮解放军总医院第一医学中心心血管内科北京100853

目的分析导管消融术治疗老年持续性心房颤动的疗效和术后复发的独立危险因素。方法纳入2019年1月至2021年12月于解放军总医院第一医学中心心血管内科接受导管消融术的持续性心房颤动患者194例,根据年龄分为老年组99例(≥60岁)及非老年... 详细信息

目的分析导管消融术治疗老年持续性心房颤动的疗效和术后复发的独立危险因素。方法纳入2019年1月至2021年12月于解放军总医院第一医学中心心血管内科接受导管消融术的持续性心房颤动患者194例,根据年龄分为老年组99例(≥60岁)及非老年组95例(<60岁)。比较2组患者手术特征、术后并发症及复发情况,分析老年组患者术后复发的独立危险因素。结果老年组年龄、B型钠尿肽、高血压、冠心病、CHA_(2)DS_(2)-VASc评分及HAS-BLED评分高于非老年组,男性、估算肾小球滤过率低于非老年组(P<0.05,P<0.01)。老年组左心房纤维化比例高于非老年组(30.3%vs 8.4%,P=0.001)。老年组术后出现1例心包积液,2例穿刺部位血肿,均经治疗后好转。老年组与非老年组术后1年成功率比较无显著差异(71.7%vs 69.5%,P=0.763);老年组与非老年组空白期复发率比较无显著差异(21.2%vs 21.1%,P=0.981)。心房颤动持续时间(HR=1.020,95%CI:1.007~1.032,P=0.002)和空白期复发(HR=6.781,95%CI:3.078~14.935,P=0.001)是老年组患者术后复发心房颤动的独立危险因素。结论导管消融术治疗老年持续性心房颤动安全有效,心房颤动持续时间长和空白期复发的老年患者术后1年内更容易出现复发。

关键词：心房颤动导管消融术危险因素心房颤动持续时间

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Strain engineering of anisotropic light-matter interactions in onedimensional P-P chain of SiP_(2)

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Nano Research 2022年第8期15卷 7378-7383页

作者： Fanghua Cheng Junwei Huang Feng Qin Ling Zhou Xueting Dai Xiangyu Bi Caorong Zhang Zeya Li Ming Tang Caiyu Qiu Yangfan Lu Huiyang Gou hongtao yuan National Laboratory of Solid State Microstructures and Jiangsu Key Laboratory of Artificial Functional Materials College of Engineering and Applied SciencesNanjing UniversityNanjing 210000China College of Materials Science and Engineering National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400030China Center for High Pressure Science and Technology Advanced Research Beijing 100094China

Strain engineering can serve as a powerful technique for modulating the exotic properties arising from the atomic structure of *** have been demonstrated that one-dimensional(1D)structure can serve as a great platform for modulating electronic band structure and phonon dispersion via strain ***,in a van der Waals material silicon diphosphide(SiP_(2)),quasi-1D zigzag phosphorus–phosphorus(P–P)chains are embedded inside the crystal structure,and can show unique phonon vibration modes and realize quasi-1D *** those optical properties by the atom displacements via strain engineering is of great interest in understanding underlying mechanism of such P–P chains,however,which remains ***,we demonstrate the strain engineering of Raman and photoluminescence(PL)spectra in quasi-1D P–P chains and resulting in anisotropic manipulation in SiP_(2).We find that the phonon frequencies of SiP_(2)in Raman spectra linearly evolve with a uniaxial strain along/perpendicular to the quasi-1D P–P chain ***,by applying tensile strain along the P–P chains,the band gap energy of strained SiP_(2)can significantly decrease with a tunable value of~55 *** on arsenic(As)element doping into SiP_(2),the strain-induced redshifts of phonon frequencies decrease,indicating the stiffening of the phonon vibration with the increased arsenic doping *** results provide an opportunity for strain engineering of the light–matter interactions in the quasi-1D P–P chains of SiP_(2)crystal for potential optical applications.

关键词： strain engineering silicon diphosphide Raman photoluminescence

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Temperature-driven reversible structural transformation and conductivity switching in ultrathin Cu_(9)S_(5)crystals

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Nano Research 2023年第7期16卷 10515-10521页

作者： Lei Zhang Zeya Li Ying Deng Li Li Zhansheng Gao Jiabiao Chen Zhengyang Zhou Junwei Huang Weigao Xu Xuewen Fu hongtao yuan Feng Luo Jinxiong Wu Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional MaterialsSmart Sensor Interdisciplinary Science CenterSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Ultrafast Electron Microscopy Laboratory The Ministry of Education(MOE)Key Laboratory of Weak-Light Nonlinear PhotonicsSchool of PhysicsNankai UniversityTianjin 300071China School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210093China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200093China

Two-dimensional(2D)materials with reversible phase transformation are appealing for their rich physics and potential applications in information ***,up to now,reversible phase transitions in 2D materials that can be driven by facile nondestructive methods,such as temperature,are still ***,we introduce ultrathin Cu_(9)S_(5)crystals grown by chemical vapor deposition(CVD)as an exemplary *** the first time,their basic electrical properties were investigated based on Hall measurements,showing a record high hole carrier density of~1022 cm^(-3) among 2D ***,an unusual and repeatable conductivity switching behavior at~250 K were readily observed in a wide thickness range of CVD-grown Cu_(9)S_(5)(down to 2 unit-cells).Confirmed by in-situ selected area electron diffraction,this unusual behavior can be ascribed to the reversible structural phase transition between the room-temperature hexagonalβphase and low-temperatureβ’phase with a *** work provides new insights to understand the physical properties of ultrathin Cu_(9)S_(5)crystals,and brings new blood to the 2D materials family with reversible phase transitions.

关键词： ultrathin Cu_(9)S_(5)crystals ultrahigh carrier density reversible phase transition conductivity switching chemical vapor deposition

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