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Multi-Path Routing and Resource Allocation in Active Network

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Wuhan University Journal of Natural Sciences 2005年第2期10卷 398-404页

作者： XUWu-ping YANPu-liu wuming SchoolofElectronicInformation WuhanUniversityWuhan430072HubeiChina

An algorithm of traffic distribution called active multi-path routing (AMR)in active network is proposed. AMR adopts multi-path routing and applies nonlinear optimizeapproximate method to distribute network traffic among multiple paths. It is combined to bandwidthresource allocation and the congestion restraint mechanism to avoid congestion happening and *** network performance can be improved greatly. The frame of AMR includes adaptive trafficallocation model, the conception of supply bandwidth and its' allocation model, the principle ofcongestion restraint and its' model, and the implement of AMR based on multi-agents system in activenetwork. Through simulations, AMR has distinct effects on network performance. The results show AMRisa valid traffic regulation algorithm.

关键词： multi-path routing resource allocation congestion control active network multi-agent system

Amorphization activated FeB_(2) porous nanosheets enable efficient electrocatalytic N_(2) fixation

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Journal of Energy Chemistry 2021年第2期30卷 82-89,I0004页

作者： Ke Chu Weicong Gu Qingqing Li Yaping liu Ye Tian wuming liu School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070GansuChina Department of Physics College of ScienceHebei North UniversityZhangjiakou 075000HebeiChina Institute of Physics Chinese Academy of SciencesBeijing 100190China

Designing active,robust and cost-effective catalysts for the nitrogen reduction reaction(NRR) is of paramount significance for sustainable electrochemical NH3 ***-metal diborides(TMB_2)have been recently theoretically predicted to be a new class of potential NRR catalysts,but direct experimental evidence is still ***,we present the first experimental demonstration that amorphous FeB_2 porous nanosheets(a-FeB_2 PNSs) could be a highly efficient NRR catalyst,which exhibited an NH3 yield of 39.8 μg h^(-1) mg^(-1)(-0.3 V) and a Faradaic efficiency of 16.7%(-0.2 V),significantly outperforming their crystalline counterpart and most of existing NRR ***-principle calculations unveiled that the amorphization could induce the upraised d-band center of a-FeB_2 to boost d-2π~* coupling between the active Fe site and ~*N_2 H intermediate,resulting in enhanced ~*N_2 H stabilization and reduced reaction *** study may facilitate the development and understanding of earth-abundant TMB_2-based catalysts for electrocatalytic N_2 fixation.

关键词： Electrocatalytic nitrogen fixation Transition-metal diborides Amorphization Density functional theory

Identifying anomalous Floquet edge modes via bulk-edge correspondence

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Chinese Physics B 2020年第4期29卷 434-438页

作者： Huanyu Wang wuming liu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Floquet engineering appears as a new protocol for designing topological states of matter,and features anomalous edge modes pinned at quasi-energy π/T with vanished topological *** propose how to predict the anomalous edge modes via the bulk Hamiltonian in frequency space,and use Zak phase to quantitatively index the topological *** above methods are clarified by the example of time periodic Kitaev chain with chemical potential of harmonic driving and pulse driving,and topological phase transitions are manifested at different driving frequencies.

关键词： Floquet energineering bulk-edge correspondence Zak phase

Testing the Intermediate-Range Force at Separations Around 50 Meters

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Chinese Physics Letters 1991年第7期8卷 329-332页

作者： YANG Xinshe liu wuming ZHAO Hailong LI Jingtian Institute of Geophysics Academia SinicaBeijing 100101 Department of Physics Mengzi Teachers CollegeMengzi 661100 Department of Physics Yunnan Normal UniversityKunming 650092

We use a LaCoste-Romberg model D gravimeter to measure the gravitational forces at fixed positions when a large cylindrical reservoir is full and when it is *** differences determine the intermediate-range force at va... 详细信息

关键词： reservoir cylindrical separation

Amorphous MoS_(3) enriched with sulfur vacancies for efficient electrocatalytic nitrogen reduction

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Journal of Energy Chemistry 2021年第2期30卷 132-138,I0005页

作者： Ke Chu Haifeng Nan Qingqing Li Yali Guo YeTian wuming liu School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070GansuChina Department of Physics College of ScienceHebei North UniversityZhangjiakou 075000HebeiChina Institute of Physics Chinese Academy of SciencesBeijing 100190China

Developing low-priced,yet effective and robust catalysts for the nitrogen reduction reaction(NRR) is of vital importance for scalable and renewable electrochemical NH3 ***,we provide the first demonstration of MoS_3 as an efficient and durable NRR catalyst in neutral *** prepared amorphous MoS_3 naturally possessed enriched S vacancies and delivered an NH3 yield of 51.7 μg h^(-1) mg^(-1)and a Faradaic efficiency of 12.8% at-0.3 V(RHE) in 0.5 M LiClO_4,considerably exceeding those of MoS_2 and most reported NRR *** functional theory calculations unraveled that S vacancies involved in MoS_3 played a crucial role in activating the NRR via a consecutive mechanism with a low energetics barrier and simultaneously suppressing the hydrogen evolution reaction.

关键词： Electrocatalytic N_2 reduction Amorphous materials Vacancy N_(2)activation

玻色的生平与物理思想--纪念玻色诞辰130周年

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自然杂志 2024年第5期46卷 389-394页

作者：李再东南雪萌刘伍明天津理工大学理学院天津市量子光学与智能光子学重点实验室天津300384 天津理工大学电气工程与自动化学院天津300384 中国科学院物理研究所北京100190

文章聚焦于20世纪初杰出的印度物理学家萨特延德拉·纳特·玻色(Satyendra Nath Bose,1894—1974)的生平和物理成就。通过对全同粒子不可分辨性和概率解释的考虑,玻色发现了光子气体在量子力学中的统计规律,并由此推导出普朗克的黑体辐... 详细信息

文章聚焦于20世纪初杰出的印度物理学家萨特延德拉·纳特·玻色(Satyendra Nath Bose,1894—1974)的生平和物理成就。通过对全同粒子不可分辨性和概率解释的考虑,玻色发现了光子气体在量子力学中的统计规律,并由此推导出普朗克的黑体辐射公式。他的工作导致了玻色-爱因斯坦统计和玻色-爱因斯坦凝聚的发现,这些成就体现了玻色在推动量子物理发展中作出的卓越贡献。

关键词：玻色量子物理普朗克公式

Quantum information and many body physics with cold atoms

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Chinese Science Bulletin 2012年第16期57卷 1910-1918页

作者： ZHANG XiaoFei CHEN YaoHua liu GuoCai WU Wei WEN Lin liu wuming Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China College of Science Honghe UniversityMengzi 661100China School of Science Hebei University of Science and TechnologyShijiazhuang 050018China

We review our recent theoretical advances in quantum information and many body physics with cold atoms in various external potential, such as harmonic potential, kagome optical lattice, triangular optical lattice, and honeycomb lattice. The many body physics of cold atom in harmonic potential is investigated in the frame of mean-field Gross-Pitaevskii equation. Then the quantum phase transition and strongly correlated effect of cold atoms in triangular optical lattice, and the interacting Dirac fermions on honeycomb lattice, are investigated by using cluster dynamical mean-field theory and continuous time quantum Monte Carlo method. We also study the quantum spin Hall effect in the kagome optical lattice.

关键词：量子信息理论冷原子物理 Gross-Pitaevskii方程多体平均场理论蒙特卡罗方法光晶格相互作用

Comparison of Additives in Anode:The Case of Graphene,MXene,CNTs Integration with Silicon Inside Carbon Nanofibers

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Acta Metallurgica Sinica(English Letters) 2021年第3期34卷 337-346页

作者： Min Jiang Miaomiao Jiang Hong Gao Junliang Chen wuming liu Yuanyuan Ma Wei Luo Jianping Yang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgyShanghai UniversityShanghai 200444China

Recently,graphene oxide(GO),MXene,carbon nanotubes(CNTs) have been used for compounding with other materials as anodes and cathodes to achieve excellent electrochemical properties for metal-ion ***,few researches have focused on the differences between the three ***,silicon,as a typical anode,is selected to integrate with MXene,GO and CNTs in carbon nanofibers(CNFs) and form Si/MXene@CNFs,Si/GO@CNFs and Si/CNTs@CNFs,*** with the results,it can be realized that these CNFs with a significant improved performance compared with pure Si@CNFs show superiority in different aspects of electrochemical ***,the reasons for the superiority are also discussed in this *** addition of MXene can improve the cycle stability of the electrodes,thereby obtaining a high capacity retention rate,CNTs are favorable for the enhancement of rate performance,and the electrodes reversible capacity can be increased due to the addition of ***,the studies on three additives may contribute to the rational design of silicon-based and other anode materials.

关键词： Silicon alloy Graphene oxide MXene Carbon nanotubes Lithium-ion battery

Nanodevices engineering and spin transport properties of MnBi_(2)Te_(4) monolayer

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npj Computational Materials 2021年第1期7卷 414-421页

作者： Yipeng An Kun Wang Shijing Gong Yusheng Hou Chunlan Ma Mingfu Zhu Chuanxi Zhao Tianxing Wang Shuhong Ma Heyan Wang Ruqian Wu wuming liu School of Physics&Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials Henan Normal UniversityXinxiangChina Department of Physics and Astronomy Mississippi State UniversityStarkvilleMSUSA Department of Chemistry Mississippi State UniversityStarkvilleMSUSA Key Laboratory of Polar Materials and Devices(MOE)&Department of Optoelectronics East China Normal UniversityShanghaiChina Department of Physics and Astronomy University of CaliforniaIrvineCAUSA School of Physics Sun Yat-Sen UniversityGuangzhouChina School of Physics and Technology Suzhou University of Science and TechnologySuzhouJiangsuChina Hebi National Lighting Co.Ltd HebiChina Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhouChina Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijingChina

Two-dimensional(2D)magnetic materials are essential for the development of the next-generation spintronic ***,layered van der Waals(vdW)compound MnBi2Te4(MBT)has attracted great interest,and its 2D structure has been reported to host coexisting magnetism and ***,we design several conceptual nanodevices based on MBT monolayer(MBT-ML)and reveal their spin-dependent transport properties by means of the first-principles *** pn-junction diodes and sub-3-nm pin-junction field-effect transistors(FETs)show a strong rectifying effect and a spin filtering effect,with an ideality factor n close to 1 even at a reasonably high *** addition,the pip-and nin-junction FETs give an interesting negative differential resistive(NDR)*** gate voltages can tune currents through these FETs in a large ***,the MBT-ML has a strong response to *** results uncover the multifunctional nature of MBT-ML,pave the road for its applications in diverse next-generation semiconductor spin electric devices.

关键词： temperature ideality transport