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All-Electric Aircraft Nose Wheel Steering System with Two Worm Gears

Transactions of Nanjing University of Aeronautics and Astronautics 2018年第1期35卷 170-180页

作者： Zhang Ming Li Chuang Wu Xin Zhu Yin Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing University of Aeronautics&AstronauticsNanjing 210016P.R.China Shanghai Aircraft Design and Research Institute Shanghai 201210P.R.China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing 211106P.R.China

As all-electric aircraft has many advantages,an aircraft nose wheel steering system would be developed to the all-electric *** the control demand of the nose wheel steering system,based on the basic principles of nose wheel steering system and the design technique of mechanotronics,an all-electric aircraft nose wheel steering system,composed of a nose wheel steering mechanism of two worm gear and a control servo system of fly-by-wire with both steering and anti-shimmy functions is designed to meet the demand for operation control in the nose wheel steering ***,based on the LMS-AMESim software,the simulation model of the system is established to simulate the dynamics for the verification of its steering *** simulation results indicate that the nose wheel steering system is reasonable,and can meet the requirements of the general ***,the prototypes of the steering mechanism and control system are studied to validate the design,and the steering test bench is prepared to test the designed *** test results,such as steer angle,rotate speed of motor are analyzed in details and compared with the theoretical *** analysis and comparison results show that the design is reasonable and the property of the prototype can achieve the design objectives.

关键词： mechanotronics design nose wheel steering system all-electric aircraft design landing gear

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Harnessing Orbital-to-Spin Conversion of Interfacial Orbital Currents for Efficient Spin-Orbit Torques

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Physical Review Letters 2020年第17期125卷 177201-177201页

作者： Shilei Ding Andrew Ross Dongwook Go Lorenzo Baldrati Zengyao Ren Frank Freimuth Sven Becker Fabian Kammerbauer Jinbo Yang Gerhard Jakob Yuriy Mokrousov Mathias Kläui State Key Laboratory for Mesoscopic Physics School of Physics Peking University Beijing 100871 China Institute of Physics Johannes Gutenberg University Mainz Staudingerweg 7 55128 Mainz Germany Graduate School of Excellence Materials Science in Mainz 55128 Mainz Germany Peter Grünberg Institut and Institute for Advanced Simulation Forschungszentrum Jülich and JARA 52425 Jülich Germany School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Beijing Key Laboratory for Magnetoelectric Materials and Devices Beijing 100871 China Center for Quantum Spintronics Department of Physics Norwegian University of Science and Technology NO-7491 Trondheim Norway

Current-induced spin-orbit torques (SOTs) allow for the efficient electrical manipulation of magnetism in spintronic devices. Engineering the SOT efficiency is a key goal that is pursued by maximizing the active interfacial spin accumulation or modulating the nonequilibrium spin density that builds up through the spin Hall and inverse spin galvanic effects. Regardless of the origin, the fundamental requirement for the generation of the current-induced torques is a net spin accumulation. We report on the large enhancement of the SOT efficiency in thulium iron garnet (TmIG)/Pt by capping with a CuOx layer. Considering the weak spin-orbit coupling (SOC) of CuOx, these surprising findings likely result from an orbital current generated at the interface between CuOx and Pt, which is injected into the Pt layer and converted into a spin current by strong SOC. The converted spin current decays across the Pt layer and exerts a “nonlocal” torque on TmIG. This additional torque leads to a maximum colossal enhancement of the SOT efficiency of a factor 16 for 1.5 nm of Pt at room temperature, thus opening a path to increase torques while at the same time offering insights into the underlying physics of orbital transport, which has so far been elusive.

关键词： Spin current Spin torque Spin-orbit coupling

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Relativistic orbital-free kinetic energy density functional for one-particle nuclear systems

arXiv

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arXiv 2025年

作者： Wu, X.H. Ren, Z.X. Liang, H.Z. Zhao, P.W. Department of Physics Fuzhou University Fujian Fuzhou350108 China State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing100871 China Institute for Advanced Simulation Forschungszentrum Jülich JülichD-52425 Germany Helmholtz-Institut für Strahlen-und Kernphysik Bethe Center for Theoretical Physics Universität Bonn BonnD-53115 Germany Department of Physics Graduate School of Science The University of Tokyo Tokyo113-0033 Japan Quark Nuclear Science Institute The University of Tokyo Tokyo113-0033 Japan Wako351-0198 Japan

This letter aims to derive the exact relativistic orbital-free kinetic energy density functional for one-particle nuclear systems in one-dimensional case. The kinetic energy is expressed as a functional of both vector and scalar densities. The functional derivatives of the kinetic energy density functional are also derived. Both the kinetic energy density functional and its functional derivatives are validated to be correct. This serves as a foundation for further exploration of more general relativistic orbital-free kinetic energy density functionals. Copyright © 2025, The Authors. All rights reserved.

关键词： Kinetic energy

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Li, An, and Morozov Reply:

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Physical Review Letters 2019年第11期123卷 119602-119602页

作者： Guodong Li Qi An Sergey I. Morozov Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of Science Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Chemical and Materials Engineering University of Nevada Reno Reno Nevada 89557 USA Department of Computer Simulation and Nanotechnology South Ural State University Chelyabinsk 454080 Russia

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swTVM: Towards Optimized Tensor Code Generation for Deep Learning on Sunway Many-Core Processor

arXiv

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arXiv 2019年

作者： Li, Mingzhen Liu, Changxi Liao, Jianjin Zheng, Xuegui Yang, Hailong Sun, Rujun Xu, Jun Gan, Lin Yang, Guangwen Luan, Zhongzhi Qian, Depei School of Computer Science and Engineering Beihang University Beijing China State Key Laboratory of Software Development Environment Beijing China National University of Singapore Singapore Singapore State Key Laboratory of Mathematical Engineering and Advanced Computing Wuxi China Science and Technology on Special System Simulation Laboratory Beijing Simulation Center Beijing China Department of Computer Science and Technology Tsinghua University Beijing China

The flourish of deep learning frameworks and hardware platforms has been demanding an efficient compiler that can shield the diversity in both software and hardware in order to provide application portability. Among the existing deep learning compilers, TVM is well known for its efficiency in code generation and optimization across diverse hardware devices. In the meanwhile, the Sunway many-core processor renders itself as a competitive candidate for its attractive computational power in both scientific computing and deep learning workloads. This paper combines the trends in these two directions. Specifically, we propose swTVM that extends the original TVM to support ahead-of-time compilation for architecture requiring cross-compilation such as Sunway. In addition, we leverage the architecture features during the compilation such as core group for massive parallelism, DMA for high bandwidth memory transfer and local device memory for data locality, in order to generate efficient codes for deep learning workloads on Sunway. The experiment results show that the codes generated by swTVM achieves 1.79× on average compared to the state-of-the-art deep learning framework on Sunway, across six representative benchmarks. This work is the first attempt from the compiler perspective to bridge the gap of deep learning and Sunway processor particularly with productivity and efficiency in mind. We believe this work will encourage more people to embrace the power of deep learning and Sunway many-core processor. Copyright © 2019, The Authors. All rights reserved.

关键词： Program compilers

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New insights into the co-locating concept on synergistic co-digestion of sewage sludge and food waste towards energy self-sufficient in future WWTPs

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Bioresource technology Reports 2020年 10卷

作者： Wang, Nan Zheng, Tianlong Ma, Yingqun School of Chemical Engineering University of Science and Technology Liaoning Anshan114051 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences 18 Shuangqing Road Haidian District Beijing100085 China Advanced Environmental Biotechnology Centre Nanyang Environment & Water Research Institute Nanyang Technological University 1 Cleantech Loop Singapore637141 Singapore

An innovative co-locating concept base on synergistic co-digestion of sewage sludge (SS) and food waste (FW) was proposed and verified in this study. The results showed that a biggest synergistic effect happened in the co-digestion of SS and FW in volatile solid (VS) mixing ratio of 1:1 with the highest methane yield of 415.3 mL/g VS. It is estimated that about 5.83 × 109 m3 of methane (equivalent to 22.86 billion kWh electric energy) could be generated from China's SS and FW annually by adopting the proposed co-digestion strategy, which was more than enough to meet the annual electric energy demand in China's WWTPs. The analysis of the engineering feasibility and economic viability clearly suggests that the future WWTPs can be transformed to a powerful profit producer instead of consumer by adopting the proposed co-locating concept, which indeed offer a new insight for future of SS and FW management towards a great environmental and economic sustainability. © 2019 Elsevier Ltd

关键词： Sewage sludge

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Energy Supply System of HVDC Equipment Based on Symmetric Capacitors Coupling

Energy Supply System of HVDC Equipment Based on Symmetric Ca...

引用

IEEE Electronic Power Grid (eGrid)

作者： Yang Gao Hui Pang Dong Liu Zhiyuan He Chong Gao Chang Lin State Key Laboratory of Advanced Transmission Technology Global Energy Interconnection Research Institute Ltd. Changping District Beijing China Beijing Key Laboratory of DC Grid Technology and Simulation Global Energy Interconnection Research Institute Ltd. Changping District Beijing China

ISBN: (数字)9781728157047

ISBN: (纸本)9781728157054

In order to solve the problem of power supply for control drivers of HVDC transmission equipment, a novel energy supply system for HVDC equipment is proposed based on capacitor DC isolation characteristic and inductance-capacitance series resonance principle, which realizes efficient transmission from ground-potential side power supply to high-potential side power supply. In this paper, the working principle of the proposed energy supply system is analyzed, and a parameter design for the topology is carried out. The simulation results of the specific examples are verified by the PSIM simulation software, which verifies the correctness and effectiveness of the proposed energy supply system.

关键词： Power supplies Capacitors Electric potential HVDC transmission RLC circuits Inductance Circuit breakers

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β-delayed two-proton decay of S27 at the proton-drip line

引用

Physical Review C 2021年第6期103卷 L061301-L061301页

作者： G. Z. Shi (石国柱) J. J. Liu (刘嘉健) Z. Y. Lin (林喆阳) H. F. Zhu (朱浩钒) X. X. Xu (徐新星) L. J. Sun (孙立杰) P. F. Liang (梁鹏飞) C. J. Lin (林承键) J. Lee (李晓菁) C. X. Yuan (袁岑溪) S. M. Wang (王思敏) Z. H. Li (李智焕) H. S. Xu (徐瑚珊) Z. G. Hu (胡正国) Y. Y. Yang (杨彦云) R. F. Chen (陈若富) J. S. Wang (王建松) D. X. Wang (王东玺) H. Y. Wu (吴鸿毅) K. Wang (王康) F. F. Duan (段芳芳) Y. H. Lam (蓝乙华) P. Ma (马朋) Z. H. Gao (高志浩) Q. Hu (胡强) Z. Bai (白真) J. B. Ma (马军兵) J. G. Wang (王建国) F. P. Zhong (钟福鹏) C. G. Wu (武晨光) D. W. Luo (罗迪雯) Y. Jiang (蒋颖) Y. Liu (刘洋) D. S. Hou (侯东升) R. Li (李忍) N. R. Ma (马南茹) W. H. Ma (马维虎) G. M. Yu (余功明) D. Patel S. Y. Jin (金树亚) Y. F. Wang (王煜峰) Y. C. Yu (余悦超) Q. W. Zhou (周清武) P. Wang (王鹏) L. Y. Hu (胡力元) X. Wang (王翔) H. L. Zang (臧宏亮) P. J. Li (李朋杰) Q. R. Gao (高祺锐) H. Jian (简豪) S. X. Zha (查思贤) F. C. Dai (戴凡超) R. Fan (范锐) Q. Q. Zhao (赵青青) L. Yang (杨磊) P. W. Wen (温培威) F. Yang (杨峰) H. M. Jia (贾会明) G. L. Zhang (张高龙) M. Pan (潘敏) X. Y. Wang (汪小雨) H. H. Sun (孙浩瀚) X. H. Zhou (周小红) Y. H. Zhang (张玉虎) M. Wang (王猛) M. L. Liu (柳敏良) H. J. Ong (王惠仁) W. Q. Yang (杨维青) CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing 100049 China School of Physics and Engineering Zhengzhou University Zhengzhou 450001 China Department of Physics The University of Hong Kong Hong Kong China Department of Nuclear Physics China Institute of Atomic Energy Beijing 102413 China Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516003 China School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China College of Physics and Technology Guangxi Normal University Guilin 541004 China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen University Zhuhai 519082 China State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing 100871 China College of Science Huzhou University Huzhou 313000 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Institute of Modern Physics Fudan University Shanghai 200433 China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin 150001 China Department of Physics Sardar Vallabhbhai National Institute of Technology Surat 395007 India School of Physics and Astronomy Yunnan University Kunming 650091 China School of Physical Science and Technology Southwest University Chongqing 400044 China School of Physics and Nuclear Energy Engineering Beihang University Beijing 100191 China RCNP Osaka University Osaka 567-0047 Japan Joint Department for Nuclear Physics Lanzhou University and Institute of Modern Physics CAS Lanzhou 730000 China

The β-delayed two-proton (β2p) decay of S27 was studied using a state-of-the-art silicon array and Clover-type HPGe detectors. An energy peak at 6372(15) keV with a branching ratio of 2.4(5)% in the decay-energy spectrum was identified as a two-proton transition via the isobaric-analog state in P27 to the ground state of Al25 in the β decay of S27. Two-proton angular correlations were measured by the silicon array to study the mechanism of two-proton emission. Based on experimental results and Monte Carlo simulations, it was found that the main mechanism for the emission of β2p by S27 is of sequential nature.

关键词： Beta decay Lifetimes & widths Nuclear structure & decays Proton emission 20 ≤ A ≤ 38

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Constraints on the two-dimensional pseudospin-12 Mott insulator description of Sr2IrO4

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Physical Review B 2022年第24期105卷 245130-245130页

作者： B. Zwartsenberg R. P. Day E. Razzoli M. Michiardi M. X. Na G. Zhang J. D. Denlinger I. Vobornik C. Bigi B. J. Kim I. S. Elfimov E. Pavarini A. Damascelli Quantum Matter Institute University of British Columbia Vancouver Canada BC V6T 1Z4 Department of Physics and Astronomy University of British Columbia Vancouver Canada BC V6T 1Z1 Max Planck Institute for Chemical Physics of Solids Nöthnitzer Straße 40 01187 Dresden Germany Key Laboratory of Materials Physics Institute of Solid State Physics HFIPS Chinese Academy of Sciences Hefei 230031 People's Republic of China Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Istituto Officina dei Materiali (IOM)-CNR Laboratorio TASC in Area Science Park S.S.14 Km 163.5 I-34149 Trieste Italy Dipartimento di Fisica Universit di Milano Via Celoria 16 I-20133 Milano Italy Department of Physics Pohang University of Science and Technology Pohang 790-784 South Korea Center for Artificial Low Dimensional Electronic Systems Institute for Basic Science (IBS) 77 Cheongam-Ro Pohang 790-784 Republic of Korea Max Planck Institute for Solid State Research Heisenbergstraße 1 D-70569 Stuttgart Germany Institute for Advanced Simulation Forschungszentrum Jülich D-52425 Jülich Germany JARA High-Performance Computing Forschungszentrum Jülich D-52425 Jülich Germany

Sr2IrO4 has often been described via a simple, one-band pseudospin-12 model subject to electron-electron interactions on a square lattice, fostering analogies with cuprate superconductors believed to be well described by a similar model. In this work we argue—based on a detailed study of the low-energy electronic structure by circularly polarized spin and angle-resolved photoemission spectroscopy combined with dynamical mean-field theory calculations—that a pseudospin-12 model fails to capture the full complexity of the system. We show instead that a realistic multiband Hubbard Hamiltonian, accounting for the full correlated t2g manifold, provides a detailed description of the interplay between spin-orbital entanglement and electron-electron interactions and yields quantitative agreement with experiments. Our analysis establishes that the j3/2 states make up a substantial percentage of the low-energy spectral weight, i.e., approximately 74% as determined from the integration of the j-resolved spectral function in the 0 to −1.64eV energy range. The results in our work are of relevance not only to Ir-based materials but also more generally to multiorbital materials with closely spaced energy scales.

关键词： Spin-orbit coupling High-temperature superconductors Mott insulators Angle-resolved photoemission spectroscopy Dynamical mean field theory Hubbard model Spin-resolved photoemission spectroscopy

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Correlation analysis in control rod worth uncertainty quantification

Correlation analysis in control rod worth uncertainty quanti...

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2018 International Conference on Physics of Reactors: Reactor Physics Paving the Way Towards More Efficient Systems, PHYSOR 2018

作者： Wang, Yizhen Hao, Chen Wu, Yingjie Wang, Lidong Guo, Jiong Li, Fu Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing100084 China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin150001 China

ISBN: (纸本)9781713808510

Precise calculation of control rod worth (CRW) is important for nuclear reactor core design which can be used to assess reactor shutdown margin, design reactivity insertion experiments and so on. Uncertainties inevitably exist in selected nuclear data library and these uncertainties will propagate to the keffand CRW. One of the issues in quantifying CRW uncertainty propagated from keffis the analysis of correlation among keffunder varying insertion depths of control rod. In this paper, based on sensitivities of keffto few-group macroscopic cross section, correlation coefficients among different keffare studied firstly. And a preliminary uncertainty quantification method of CRW is proposed with such correlation information of keffas well as their uncertainties resulting from nuclear data library. A mini core model is established and statistical sampling on CRW is conducted to validate the uncertainty of CRW obtained by the method proposed in this work. © 2018 International Conference on Physics of Reactors, PHYSOR 2018: Reactor Physics Paving the Way Towards More Efficient Systems. All rights reserved.

关键词： Reactor shutdowns

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