检索结果-内蒙古大学图书馆

12th China Satellite Navigation Conference, CSNC 2021

作者： Yang, Jun Zheng, Ning Cui, Jingzhong Wang, Shiwei Yang, Wei Ma, Pei Liu, Zhidong Chen, Jiang Ma, Yinguang Zhao, Yulong Huang, Liangyu Dong, Pengling Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Space Technology and Physics Lanzhou730000 China

ISBN: (纸本)9789811631450

Spaceborne cesium atomic clock with magnetic selectors (SCAC) has been used in the global navigation satellite system (GNSS), which can not only improve the positioning accuracy, but also enhance the ability of autonomous operation. So a SCAC product is very favored, but it is very difficult to manufacture. Until November 2019, among the world’s four largest GNSS, only GPS in the U.S. and GLONASS in Russia are equipped with the SCACs. But this situation has been changed now, the first SCAC product in China has been developed by improving its cesium beam tube, frequency standard circuit etc. based on the prototype [1]. The product has been carried on the Beidou navigation satellite and its working state is stable in orbit at present. The analysis results of on-ground and in-orbit data show that the key performance indexes such as frequency accuracy, long-term stability and frequency drift rate could meet the application requirements, and that the product has good space environment adaptability. This paper discusses on the ground environmental test items, methods, conclusions and in-orbit verification related to the product, and summarizes some achievements and experiences in tackling the key technology of the SCAC environmental adaptability, which is very helpful for improving the design ability in space environmental adaptability of atomic clocks. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Global positioning system

来源：评论

学校读者我要写书评

暂无评论

High-performance non-Fermi-liquid metallic thermoelectric materials

引用

npj Computational Materials 2023年第1期9卷 1943-1949页

作者： Zirui Dong Yubo Zhang Jun Luo Ying Jiang Zhiyang Yu Nan Zhao Liusuo Wu Yurong Ruan Fang Zhang Kai Guo Jiye Zhang Wenqing Zhang School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Department of Materials Science and Engineering Department of Physicsand Shenzhen Institute for Quantum Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China Shenzhen Municipal Key-Lab for Advanced Quantum Materials and Devices and Guangdong Provincial Key Lab for Computational Science and Materials DesignSouthern University of Science and TechnologyShenzhen 518055China Materials Genome Institute Shanghai UniversityShanghai 200444China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350002China School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China

Searching for high-performance thermoelectric(TE)materials in the paradigm of narrow-bandgap semiconductors is hampered by a *** we report on the discovery of metallic compounds,TiFe_(x)Cu_(2x−1)Sb and TiFe1.33Sb,showing the thermopower exceeding many TE semiconductors and the dimensionless figure of merits zTs comparable with the state-of-the-art TE materials.A quasi-linear temperature(T)dependent electrical resistivity in 2–700 K and the logarithmic T-dependent electronic specific heat at low temperature coexist with the high thermopower,highlighting the strong intercoupling of the non-Fermi-liquid(NFL)quantum critical behavior of electrons with TE *** structure analysis reveals a competition between the antiferromagnetic(AFM)ordering and Kondo-like spin compensation as well as a parallel two-channel Kondo *** T-dependent magnetic susceptibility agrees with the quantum critical scenario of strong local *** work demonstrates the correlation among high TE performance,NFL quantum criticality,and magnetic fluctuation,which opens up directions for future research.

关键词： materials metallic Fermi

来源：评论

学校读者我要写书评

暂无评论

Hexagonal Boron Nitride Nanosheets Filler Infiltrated Polymer Composite Films for Thermal Management Applications 23

Hexagonal Boron Nitride Nanosheets Filler Infiltrated Polyme...

引用

23rd IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, ITherm 2024

作者： Ravichandran, Vanmathi Varrla, Eswaraiah Srm Institute of Science and Technology Sustainable Nanomaterials and Technologies Lab Department of Physics and Nanotechnology Chengalpattu Tamil Nadu Kattankulathur603203 India

ISBN: (纸本)9798350364330

Thermally conductive and electrically insulating nanofillers are ideal materials in a polymer for the synthesis of thermal compounds to dissipate the heat from sensitive electronic devices. However, the practical application of existing thermal compounds is limited by the insufficient heat transfer pathways and usage of extremely high-filler loading. This affects the processability and synergistic effect of nanocomposites and consequently deterioration in mechanical properties. To improve the distribution and orientation of the fillers, here we have used a spray coating followed by hot pressing method with the help of exfoliated hexagonal boron nitride nanosheets (h-BNNS) with the aspect ratio ~130 is used as filler in the ethylene vinyl acetate (EVA) matrix. The thermal management application for the composite film was demonstrated with the help of a 10 W light-emitting diode bulb. It was found that the thermal compound film with the addition of 15 wt.% h-BNNS shows the surface temperature reduction by~9 °C compared to the pure EVA matrix. This work provides a simple, scalable, and high heat-spreading thermal compound composite that may be used for next-generation heat dissipation in consumer electronics. © 2024 IEEE.

关键词： Boron nitride

来源：评论

学校读者我要写书评

暂无评论

Single-Molecule Confinement Induced Intrinsic Multi-Electron Redox-Activity to Enhance Supercapacitor Performance

引用

Energy & Environmental Materials 2023年第4期6卷 227-238页

作者： Su Yang Meiling Wang Yong Zhang Pinyi He Wenhua Cong Chongji Wang Qiankun Yang Xuguang Liu Tian Wang Xianming Zhang Jiadong Zhou College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of TechnologyBeijing 100081China School of Materials Science and engineering Central South UniversityChangsha 410083China Department of Chemistry National University of Singapore3 Science Drive 3117543Singapore Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education (Taiyuan University of Technology)Taiyuan 030024China

Aggregation of polyoxometalates(POM)is largely responsible for the reduced performance of POM-based energy-storage *** address this challenge,here,the precise confinement of single Keggin-type POM molecule in a porous carbon(PC)of unimodal super-micropore(micro-PC)is *** precise single-molecule confinement enables sufficient activity center exposure and maximum electron-transfer from micro-PC to POM,which well stabilizes the electron-accepting molecules and thoroughly activates its inherent multi-electron *** particular,the redox-activities and electron-accepting properties of the confined POM molecule are revealed to be super-micropore pore size-dependent by experiment and spectroscopy as well as theoretical ***,the molecularly dispersed POM molecules confined steadily in the“cage”of micro-PC exhibit unprecedented large-negative-potential stability and multiple-peak redox-activity at an ultra-low loading of~11.4 wt%.As a result,the fabricated solid-state supercapacitor achieves a remarkable areal capacitance,ultrahigh energy and power density of 443 mF cm^(-2),0.12 mWh cm^(-2)and 21.1 mW cm^(-2),*** work establishes a novel strategy for the precise confinement of single POM molecule,providing a versatile approach to inducing the intrinsic activity of POMs for advanced energy-storage systems.

关键词： intrinsic redox-activity polyoxometalates single-molecule confinement supercapacitor

来源：评论

学校读者我要写书评

暂无评论

Van der Waals materials-based floating gate memory for neuromorphic computing

引用

Chip 2023年第4期2卷 27-44页

作者： Qianyu Zhang Zirui Zhang Ce Li Renjing Xu Dongliang Yang Linfeng Sun Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quan-tum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Key Lab of Nanophotonics&Ultra-fine Optoelectronic Systems School of PhysicsBeijing Institute of TechnologyBeijing 100081China Thrust of Microelectronics of Function Hub The Hong Kong University of Science and Technology(Guangzhou)Guangzhou 511400China

With the advent of the“Big Data Era”,improving data storage density and computation speed has become more and more urgent due to the rapid growth in different types of *** memory with a floating gate(FG)structure is attracting great attention owing to its advantages of miniaturization,low power consumption and reli-able data storage,which is very effective in solving the problems of large data capacity and high integration ***,the FG memory with charge storage principle can simulate synaptic plasticity perfectly,breaking the traditional von Neumann computing ar-chitecture and can be used as an artificial synapse for neuromorphic computations inspired by the human *** many candidate materials for manufacturing devices,van der Waals(vdW)materials have attracted widespread attention due to their atomic thickness,high mobility,and sustainable miniaturization *** to the arbitrary stacking ability,vdW heterostructure combines rich physics and potential 3D integration,opening up various possibilities for new functional integrated devices with low power consumption and flexible *** paper provides a comprehensive review of memory devices based on vdW materials with FG structure,including the working principles and typical structures of FG structure devices,with a focus on the introduction of various highperformance FG memories and their versatile applications in neuro-morphic ***,the challenges of neuromorphic devices based on FG structures are also *** review will shed light on the design and fabrication of vdW material-based memory devices with FG engineering,helping to promote the development of practical and promising neuromorphic computing.

关键词： Van der Waals materials Floating gate memory Memristor Neuromorphic computing

来源：评论

学校读者我要写书评

暂无评论

Synthesis and Characterization of Laser Ablated Vanadium Disulfide Quantum Dots for Optical Limiting Applications

Synthesis and Characterization of Laser Ablated Vanadium Dis...

引用

2024 Applications of Lasers for Sensing and Free Space Communications, LS and C 2024

作者： Elamkulavan, Hasana Jahan Vinu, Vijisha Mullassery Purayil, Anagha Keloth, Chandrasekharan Laser and Nonlinear Optics Lab Department of Physics National Institute of Technology Kerala Calicut673601 India International School of Photonics Cochin University of Science & Technology Kerala Cochin682022 India

We introduce the synthesis of vanadium disulfide quantum dots by pulsed laser ablation of a vanadium disulfide target in diacetone alcohol. We demonstrate the ability of these fluorescent quantum dots to be used in op... 详细信息

关键词： Laser ablation

来源：评论

学校读者我要写书评

暂无评论

Mott insulating phase and coherent-incoherent crossover across magnetic phase transition in 2D antiferromagnetic CrSBr

引用

science China(physics,Mechanics & Astronomy) 2025年第6期68卷 179-186页

作者： Fan Wu Xuefeng Zhang Yi Chen Ding Pei Mengwen Zhan Zicheng Tao Cheng Chen Shipeng Lu Jingzhi Chen Shujie Tang Xia Wang Yanfeng Guo Lexian Yang Yan Zhang Yulin Chen Qixi Mi* Gang Li Zhongkai Liu School of Physical Science and Technology ShanghaiTech Laboratory for Topological PhysicsShanghaiTech UniversityShanghai 201210China Lingang Laboratory Shanghai 200031China Synchrotron SOLEIL L’Orme des MerisiersSaint-Aubin 91190France Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800China State Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China 2020 X-Lab Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China .7 International Center for Quantum Materials Peking UniversityBeijing 100084China Analytical Instrumentation Center School of Physical Science and TechnologyShanghaiTech UniversityShanghai 201210China State Key Laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Department of Physics Clarendon LaboratoryUniversity of OxfordOxford OX13PUUK

In two-dimensional van der Waals magnetic materials,the interplay between magnetism and electron correlation can give rise to new ground states and lead to novel transport and optical properties.A fundamental question in these materials is how the electron correlation manifests and interacts with the magnetic *** this study,we demonstrate that the recently discovered 2D antiferromagnetic material,CrSBr is a Mott insulator,through the combined use of resonant and temperature-dependent angle-resolved photoemission spectroscopy techniques,supplemented by dynamical mean-field theory ***,we found that as the system transitions from the antiferromagnetic to the paramagnetic phases,its Mott bands undergo a reconfiguration,and a coherent-incoherent crossover,driven by the dissolution of the magnetic *** findings reveal a distinctive evolution of band structure associated with magnetic phase transitions,shedding light on the investigation of the intricate interplay between correlation and magnetic orders in strongly correlated van der Waals magnetic materials.

关键词： two-dimensional magnetic material strongly correlated electrons angle-resolved photoemission dynamical mean field theory

来源：评论

学校读者我要写书评

暂无评论

Fast evaluating phonon life time and thermal conductivity determined by Grüneisen parameter and phase space size of three-phonon scattering

引用

Frontiers of physics 2025年第1期20卷 83-91页

作者： Yi Wang Shenshen Yan Xi Wu Jie Ren Center for Phononics and Thermal Energy Science China-EU Joint Lab on NanophononicsShanghai Key Laboratory of Special Artificial Microstructure Materials and TechnologySchool of Physics Science and EngineeringTongji UniversityShanghai 200092China Shanghai Research Institute for Intelligent Autonomous Systems Tongji UniversityShanghai 200092China

Efficiently and fast seeking specific lattices with targeted phonon thermal conductivityκ_(L)plays an important role in the thermal design and thermal management of *** to efficiently and accurately evaluate the phonon lifetime determined by anharmonicity becomes a critical bottleneck when high-throughput ***,we propose a method of fast evaluating three-phonon scattering induced lifetime based on the many-body theory of phonon *** the high temperature limit,the phonon scattering rate is simply determined by the product of only two anharmonic parameters:the square of Grüneisen parameter and the phase space size of three-phonon scattering,both of which can be quickly derived from the harmonic phonon *** demonstrate the effectiveness of the method in high-throughput evaluatingκ_(L)the in firstprinciples calculation,which exhibits a good consistence with our collected experimental *** method shows promising application potential in exploring material screening of the targetedκ_(L),which by improving the ability of characterizing phonon anharmonicity will further enhance the performanceκ_(L)of prediction.

关键词： many-body theory thermal conductivity anharmonic properties three-phonon scattering first-principles calculation highthroughput calculations

来源：评论

学校读者我要写书评

暂无评论

High-Temperature Wear and Oxidation Behavior of (Crnbtamovw)N High Entropy Films Deposited by Reactive Magnetron Sputtering

SSRN

引用

SSRN 2023年

作者： Feng, Xingguo Zheng, Yugang Wang, Keliang Hu, Hanjun Zhang, Kaifeng Zhou, Hui Science and Technology on Vacuum Technology and Physical Laboratory Lanzhou Institute of Physics Lanzhou730000 China

With rapid advances in industrial technology, a great number of mechanical parts are required to work at high temperatures. High entropy alloy film is a candidate material for high-temperature resistant film that will be used to control friction and reduce wear. For this objective, the (CrNbTaMoVW)N high-entropy films were prepared on YG6 cemented carbide using reactive DC magnetron sputtering, and the oxidation and tribological performance of the films from room temperature (RT) to 800 ℃ were investigated. Oxidation results showed that the (CrNbTaMoVW)N film maintained its simple FCC structure up to 600 ℃ in air for 3h. As the oxidation temperature increased to 800 ℃, the film was completely oxidized, and the structure changed from FCC to complex metal oxides and metal oxynitrides. The hardness and modulus of HEAs film reached the maximum values of 30.6 GPa and 301.7 GPa after oxidation at 600 ℃ for 3h. Tribological results showed that the friction coefficient and wear rate increased when the test temperature increased. However, the (CrNbTaMoVW)N film showed a wear rate of about 10-15 m3/N•m from RT to 600 ℃, indicating excellent high-temperature tribological properties. Due to the formation of loose metal oxides and low hardness at 800, the wear resistance of (CrNbTaMoVW)N film was greatly degraded compared to the test temperature of 600℃. © 2023, The Authors. All rights reserved.

关键词： Entropy

来源：评论

学校读者我要写书评

暂无评论

A four-dimensional model for the information storage/output of life

引用

Nano Research 2023年第2期16卷 2630-2634页

作者： Bo Song Lei Jiang Key Laboratory of Optical Technology and Instrument for Medicine Ministry of EducationShanghai Key Lab of Modern Optical SystemSchool of Optical-Electrical Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China

A large amount of progress has achieved in neuroscience,however,there is still a lack of reasonable model for the storage/output(S/O)of life *** cyclical motion of cardio-and pulmonary-myocyte is a typical process of the life information S/O,while the opening and closing sites of Ca^(2+)ion channels during the motion can form a genetically programmed time-dependent three-dimensional(3D)*** phenomena indicate a strong correlation of the information S/O model of these myocytes with the time-sequence 3D ***,based on the time-dependent Ca^(2+)fluorescence imaging during the motion of cardio-and pulmonary-myocyte,here we suggest a four-dimensional(4D)code of information S/O model in cell and nervous *** from the fact of pulmonary myocyte motion able to be controlled by brain,it is deduced that the 4D code in brain has a role of controlling muscles through a pathway of the central nervous system,peripheral nervous system,neuromuscular junction,and muscle *** addition,we also suggested the 4D code of non-innate skill that can be programmed by the learning/training of a long time(~3 years),such as walking,writing,painting,sports,speech,singing,and ***,this 4D S/O model is reasonable for the ultralow energy consumption of life information transmission.

关键词： four-dimensional(4D)storage/output model life information cell nervous system

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：