检索结果-内蒙古大学图书馆

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

New lead-free chemistry for in-situ monitoring of advanced nuclear power plant

Advanced Powder Materials

引用

Advanced Powder Materials 2024年第5期3卷 135-143页

作者： Lexing Liang Xiuling Wang Cong Zhang Kailei Lu Guangfan Tan Yanhao Dong Yanli Shi Jianqi Qi Tiecheng Lu College of Physics Sichuan UniversityChengdu 610065China Key Laboratory of High Energy Density Physics of Ministry of Education Sichuan UniversityChengdu 610065China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Radiation Physics and Technology of Ministry of Education Sichuan UniversityChengdu 610065China

Nuclear power is essential for sustainable energy infrastructure and economic development,necessitating materials for high-radiation environments that can facilitate visualization and *** lead glass is inadequate for future requirements due to radiation-induced darkening,poor mechanical properties,and ***,there is urgent to find new window materials that offer multi-ionization shielding(particularly against deep-penetrating gamma ray,γ,and neutron,n,radiations),desirable opto-mechanical properties,service stability against darkening,and *** this study,we report a family of transparent rare-earth pyrochlore ceramics La_(x)Gd_(2-x)Zr_(2)O_(7),offering unique chemo-physical properties that are ideal for robust radiation shielding ***,we demonstrated the capability of maintaining high transparency under heavy-dose exposure to 1000 kGy ^(60)Coγ*** observed the service stability against radiation darkening can be greatly enhanced with La-rich compositions,while Gd-rich compositions undergo shallow darkening that can be reversibly recovered under visible *** behavior is attributed to mitigated oxygen migration from 48f to 8a in La-rich compositions,which have high pyrochlore phase stability and well-ordered atomic structures,and reversible oxygen migration between 48f and 8a in Gd-rich compositions,which remain active at room *** proposal and demonstration unlock ample opportunities in designing functional transparent ceramics as window materials for demanding applications in high-radiation environments.

关键词： Radiation shielding Transparent ceramics Radiation darkening Oxides Defects

来源：评论

学校读者我要写书评

暂无评论

Image motion and experimental study of a 0.1″space pointing measuring instrument for micro-vibration conditions

引用

Chinese Journal of Aeronautics 2023年第2期36卷 191-200页

作者： Lin LI Li YUAN Li WANG Miaomiao WANG Xiaoxue GONG Jie SUI Yanpeng WU Ran ZHENG Space Optoelectronic Measurement and Perception Lab. Beijing Institute of Control EngineeringBeijing 100190China China Academy of Space Technology Beijing 100094China Science and Technology on Space Intelligent Control Laboratory Beijing 100094China University of Chinese Academy of Sciences Beijing 100049China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Chang Guang Satellite Technology Co. Ltd.Changchun130102China

There exists an increasing need for Milli-Arc-Seconds(MAS)accuracy pointing measurement for current and future space *** meet the 0.1″space pointing measurement accuracy requirements of spacecraft in future,the influence of spacecraft micro-vibration on a 0.1″Space Pointing Measuring Instrument(SPMI)is studied.A Quasi-Zero Stiffness Device(QZSD)with adaptive adjustment and variable stroke was ***,a series of micro-vibration experiments of the SPMI were carried *** influence of the micro-vibration generated by Guidance Navigation Control(GNC)attitude control components under different attitudes on the SPMI was *** spread function of image motion in micro-vibration was also ***,the changes of image motion under the micro-vibration environment were evaluated by extracting the gray centroid of the images,and the experiment processes and results are deeply *** results show that the firstorder frequency of the QZSD system is 0.114 Hz,and it is induced by a double pendulum system;the image motion of single flywheel spinning reached 0.015 pixels;whilst the image motion reached 0.03 pixels when three flywheels are combined *** latest findings provide a beneficial theoretical and technical support for the development of spacecraft with 0·1″pointing accuracy.

关键词： Image motion Micro-vibration Milli-arc-seconds Quasi-zero stiffness device Space pointing measuring instrument

来源：评论

学校读者我要写书评

暂无评论

Flexible liquid metal electromagnetic shielding materials

引用

science China(Technological sciences) 2023年第10期66卷 2757-2774页

作者： BAI YunLong ZHANG Jie ZHANG MingKuan RAO Wei Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Beijing Key Lab of CryoBiomedical Engineering and Key Lab of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100039China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of TechnologyTianjin 300384China

The demand for flexible shielding has been rapidly growing in recent *** materials using solid metals,carbon materials,or MXenes as shielding units usually have difficulty in combining high shielding and flexibility(stretching and bending characteristics),and thus they gradually fail to meet the shielding needs of flexible ***,shielding materials with both flexibility and high conductivity are urgent to fill this ***-based room temperature liquid metal(LM)is an emerging functional material with a low melting point,low viscosity,low modulus,and easy ***,due to wettability and compatibility issues,it is difficult to apply bulk LMs directly in the field of electromagnetic shielding(EMS).The article reviews the fabrication methods,performance,and applications of LMs EMS materials from three perspectives:Macroscopic LMs,micro/nano-LMs,and LM-based *** gallium-based liquid EMS materials demonstrate the characteristics of high shielding performance with stretchability and a wide shielding *** this review,different types of gallium-based LM materials are described from macroscopic to microscopic,from liquid to semi-solid,from high density to low density,from room temperature to ultra-low temperature,and from monolayer structure to multilayer *** prospect of LM materials as amorphous high-performance EMS materials is demonstrated in various applications,such as mobile communication,astronomical observation,radar,and medical detection,showing tremendous potential in the EMS field.

关键词： liquid metal electromagnetic shielding flexibility

来源：评论

学校读者我要写书评

暂无评论

Realizing simultaneously excellent energy storage and discharge properties in AgNbO_(3)based antiferroelectric ceramics via La^(3t)and Ta^(5+)co-substitution strategy

引用

Journal of Materiomics 2023年第2期9卷 410-421页

作者： Yuqi Zhou Shuaibing Gao Jie Huang Meng Shen Shenglin Jiang Yunbin He Qingfeng Zhang Hubei Key Lab of Ferro&Piezoelectric Materials and Devices School of Materials Science&EngineeringHubei UniversityWuhan430062China School of Physics and Electronic Science Hubei UniversityWuhan430062China School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China

AgNbO_(3)based antiferroelectric(AFE)ceramics have large maximum polarization and low remanent polarization,and thus are important candidates for fabricating dielectric ***,their energy storage performances have been still large difference with those of lead-based AFEs because of their room-temperature ferrielectric(FIE)*** this study,novel La^(3+)and Ta^(5+)co-substituted AgNbO_(3)ceramics are designed and *** introduction of La^(3+)and Ta^(5+)decreases the tolerance factor,reduces the polarizability of B-site cations and increases local structure heterogeneity of AgNbO_(3),which enhance AFE phase stability and refine polarization-electric field(PeE)***,adding La^(3+)and Ta^(5+)into AgNbO_(3)ceramics causes the decrease of the grain sizes and the increase of the band gap,which contribute to increased *** a consequence,a high recoverable energy density of 6.79 J/cm3 and large efficiency of 82.1%,which exceed those of many recently reported AgNbO_(3)based ceramics in terms of overall energy storage properties,are obtained in(Ag0.88La0.04)(Nb0.96Ta0.04)O_(3)***,the discharge properties of the ceramic with discharge time of 16 ns and power density of 145.03 MW/cm3 outperform those of many lead-free dielectric ceramics.

关键词： AgNbO_(3)antiferroelectrics Grain sizes Tolerance factor Energy storage Discharge properties

来源：评论

学校读者我要写书评

暂无评论

Local symmetry enhanced Majorana zero modes in one-dimensional fermionic systems with particle-number preserving interactions

引用

Physical Review B 2024年第23期110卷 235423-235423页

作者： Xing-Shuo Xu Xiang-Fa Zhou Guang-Can Guo CAS Key Lab of Quantum Information University of Science and Technology of China Hefei 230026 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei 230026 China Anhui Center for Fundamental Sciences in Theoretical Physics University of Science and Technology of China Hefei 230026 China and Hefei National Laboratory University of Science and Technology of China Hefei 230088 China

The realization and manipulation of topological Majorana zero modes (MZMs) have been pivotal in both theoretical and experimental research. In this paper, we present a symmetry enhanced topological model that supports stable, localized MZMs in a one-dimensional interacting fermionic system. The MZMs in our model, induced by particle-number conserving interactions, are fully decoupled from the chain's interior and remain degenerate regardless of chain length, allowing for simulations in extremely short fermionic chains. The topological phase transition is driven by changes in coupling parameters, transitioning to a trivial phase without affecting the MZMs' independence or degeneracy, only their topological protection. Additionally, local symmetries in the model enhance MZMs' stability and reveal unique odd-even effects across different chain lengths.

关键词： Topology

来源：评论

学校读者我要写书评

暂无评论

Defect Passivation on Lead-Free CsSnI_(3) Perovskite Nanowires Enables High-Performance Photodetectors with Ultra-High Stability

引用

Nano-Micro Letters 2022年第12期14卷 481-490页

作者： Zheng Gao Hai Zhou Kailian Dong Chen Wang Jiayun Wei Zhe Li Jiashuai Li Yongjie Liu Jiang Zhao Guojia Fang International School of Microelectronics Dongguan University of TechnologyDongguan 523808GuangdongPeople’s Republic of China Key Lab of Artificial Micro-and Nano-Structures of Ministry of Education of China School of Physics and TechnologyWuhan UniversityWuhan 430072People’s Republic of China Faculty of Physics and Electronic Science Hubei UniversityWuhan 430062People’s Republic of China

In recent years,Pb-free CsSnI_(3) perovskite materials with excellent photoelectric properties as well as low toxicity are attracting much atten-tion in photoelectric ***,deep level defects in CsSnI_(3),such as high density of tin vacancies,structural deformation of SnI_(6)−octahedra and oxidation of Sn^(2+)states,are the major challenge to achieve high-performance CsSnI_(3)-based photoelectric devices with good *** this work,defect passivation method is adopted to solve the above issues,and the ultra-stable and high-performance CsSnI_(3) nanowires(NWs)photodetectors(PDs)are fabricated via incorporating 1-butyl-2,3-dimethylimidazolium chloride salt(BMIMCl)into *** materials analysis and theoretical calculations,BMIM+ions can effectively passivate the Sn-related defects and reduce the dark current of CsSnI_(3) NW *** further reduce the dark current of the devices,the polymethyl methacrylate is introduced,and finally,the dual passivated CsSnI_(3) NWPDs show ultra-high performance with an ultra-low dark current of 2×10^(-11) A,a responsivity of up to 0.237 A W^(−1),a high detectivity of 1.18×10^(12) Jones and a linear dynamic range of 180 ***,the unpackaged devices exhibit ultra-high stability in device performance after 60 days of storage in air(25℃,50% humidity),with the device performance remaining above 90%.

关键词： Pb-free Perovskite CsSnI_(3) Photodetector Nanowire

来源：评论

学校读者我要写书评

暂无评论

Analysis of In-Orbit Data of Domestic Space-Borne Cesium Atomic Clock 12th

Analysis of In-Orbit Data of Domestic Space-Borne Cesium Ato...

引用

12th China Satellite Navigation Conference, CSNC 2021

作者： Ma, Pei Xie, Jun Cui, Jingzhong Liu, Zhidong Dong, Pengling Wang, Shiwei Chen, Jiang Yang, Wei Wang, Lu Wang, Ji Ma, Yinguang Wang, Jianxiang Lian, Jiqing Huang, Liangyu Yang, Jun Zhao, Yulong Zheng, Ning Wang, Dongjun Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Space Technology and Physics Lanzhou730000 China Institute of Telecommunication and Navigation Satellites CAST Beijing100089 China

ISBN: (纸本)9789811631450

Space-borne cesium clock is the load of space time keeping system of navigation system, which provides frequency information with high accuracy and high stability for positioning and timing. Satellite-borne cesium clock has the characteristics of low drift, high frequency accuracy and high environmental adaptability. The Beidou Navigation Satellite carried a cesium clock, which is the first time that China has sent a domestic cesium clock into space. The performance of the cesium clock can be characterized by frequency stability, accuracy and drift. Taking the passive hydrogen clock as a reference, the output frequency signal of the cesium clock was measured and transmitted down to the ground. Based on the phase comparison data of 29.17 million valid data points, Allan Deviation was used to calculate the frequency stability of the space-borne cesium clock, which was 1.91E−12 per second, 4.95E−14 per 100,000 s. And the frequency accuracy was 1.73E−12. The frequency drift rate was 1.12E−16/day. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Frequency stability

来源：评论

学校读者我要写书评

暂无评论

General Lipschitz: Certified Robustness Against Resolvable Semantic Transformations via Transformation-Dependent Randomized Smoothing 27

General Lipschitz: Certified Robustness Against Resolvable S...

引用

27th European Conference on Artificial Intelligence, ECAI 2024

作者： Korzh, Dmitrii Pautov, Mikhail Tsymboi, Olga Oseledets, Ivan Skolkovo Institute of Science and Technology Moscow Russia Artificial Intelligence Research Institute Moscow Russia ISP RAS Research Center for Trusted Artificial Intelligence Moscow Russia Moscow Institute of Physics and Technology Moscow Russia Sber AI Lab Moscow Russia

ISBN: (纸本)9781643685489

Randomized smoothing is the state-of-the-art approach to constructing image classifiers that are provably robust against additive adversarial perturbations of bounded ***, it is more complicated to compute reasonable certificates against semantic transformations (e.g., image blurring, translation, gamma correction) and their *** this work, we propose General Lipschitz (GL), a new flexible framework to certify neural networks against resolvable semantic *** the framework, we analyze transformation-dependent Lipschitz-continuity of smoothed classifiers *** parameters and derive corresponding robustness *** assess the effectiveness of the proposed approach, we evaluate it on different image classification datasets against several state-of-the-art certification methods. © 2024 The Authors.

关键词： Image classification

来源：评论

学校读者我要写书评

暂无评论

Self-assembled synthesis of oxygen-doped g-C3N4 nanotubes in enhancement of visible-light photocatalytic hydrogen

引用

Journal of Energy Chemistry 2021年第3期30卷 36-44页

作者： Yizeng Zhang Zhiwu Chen Jinliang Li Zhenya Lu Xin Wang School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640GuangdongChina Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhou 510632GuangdongChina

Currently,photocatalytic water splitting is regarded as promising technology in renewable energy ***,the conversion efficiency suffers great restriction due to the rapid recombination of charge *** designed the structure and doping elements become important alternative routes to improve the performance of *** this work,we rational designed oxygen-doped graphitic carbon nitride(OCN)nanotubes derived from supermolecular intermediates for photocata lytic water *** as prepared OCN nanotubes exhibit an outstanding hydrogen evolution rate of 73.84μmol h^(-1),outperforming the most of reported one dimensional(1D)g-C_(3)N_(4) *** to the rational oxygen doping,the band structure of g-C_(3)N_(4) is meliorated,which can narrow the band gap and reduce the recombination rate of photogene rated ***,the hollow nanotube structure of OCN also provide multiple diffuse reflection during photocata lytic reaction,which can significantly promote the utilization capacity of visible light and enhance the photocatalytic water splitting *** is believed that our work not only rationally controls the nanostructure,but also introduces useful heteroatom into the matrix of photocatalyst,which provides an effective way to design high-efficiency g-C_(3)N_(4) photocatalyst.

关键词： Graphitic carbon nitride Oxygen-doped Nanotube Photocatalytic water splitting Reaction process

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：