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IEEE International Conference on Robotics and Biomimetics

作者： Sheng Zhang Xiangtao Zhuan Yating Fang Jun Cheng School of Electrical and Automation Wuhan University Wuhan China CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institute of Advanced Technology CAS China School of Transportation Science and Engineering Civil Aviation University of China Tianjin China The Chinese University of Hong Kong Hong Kong China

ISBN: (纸本)9781665405362

Lane keeping assistance system is a widely used driving assistance system. When the vehicle enters and exits a curve, the responses related to lateral stability will show significant fluctuations. Smooth lane keeping is the cornerstone of the user’s trust towards the lane keeping assistance, and it is important to smooth the responses related to lateral stability. Therefore, in this paper, a lane keeping control strategy that can achieve smooth steering operation is proposed. First of all, the lateral dynamics model that can be used for lane keeping control conveniently is established. In addition, with the model predictive control (MPC), the control strategy for lane keeping is designed. The main control objective is lateral stability, and performance variables are used to measure the performance during lane keeping process. What’s more, the contribution of this paper is that a reference trajectory in the form of an exponential decay function is set for the performance variables, so that the performance variables approach the optimal value in a smooth manner. Finally, two simulation scenarios for lane keeping are set up, and the control strategy in this paper is verified by simulation experiments.

关键词： Analytical models Fluctuations Smoothing methods Lane departure warning systems Stability analysis Trajectory Vehicle dynamics

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Differences of the oxidation process and secondary organic aerosol formation at low and high precursor concentrations

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Journal of Environmental sciences 2019年第5期31卷 256-263页

作者： Tianzeng Chen Yongchun Liu Biwu Chu Changgeng Liu Jun Liu Yanli Ge Qingxin Ma Jinzhu Ma Hong He State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences University of Chinese Academy of Sciences Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences

Current atmospheric quality models usually underestimate the level of ambient secondary organic aerosol(SOA), one of the possible reasons is that the precursors at different concentrations may undergo different oxidation processes and further affect SOA formation. Therefore, there is a need to perform more chamber studies to disclose the influence. In this work, SOA formation over a wide range of initial precursor concentrations(tens of ppb to hundreds of ppb levels) was investigated in a 30 m3 indoor smog chamber,and mainly through the analysis of multiple generations of VOCs detected from HR-To FPTRMS to expound the difference in the oxidation process between low and high precursor concentrations. Compared to high initial concentrations, gas-phase intermediates formed at low concentrations had a higher intensity by about one order of magnitude, and the lowvolatility compounds also had a higher formation potential due to the competition between semi-volatile intermediates and precursors with oxidants. In addition, the formed SOA was more oxidized with higher f44 value(0.14 ± 0.02) and more relevant to real atmosphere than that formed at high concentrations. This work should help to deeply understand SOA formation and improve the performance of air quality models for SOA simulation.

关键词： Secondary organic aerosol Aromatic hydrocarbons Aerosol mass spectrometer Low-volatility compounds Oxidation processes

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Diffusion mechanism simulation of cloud manufacturing complex network based on cooperative game theory

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Journal of Systems Engineering and Electronics 2018年第2期29卷 321-335页

作者： GENG Chao QU Shiyou XIAO Yingying WANG Mei SHI Guoqiang LIN Tingyu XUE Junjie JIA Zhengxuan Economics and Management School Harbin Institute of Technology at Weihai Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation Center State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System Engineering Science and Technology on Space System Simulation Laboratory Beijing Simulation Center

Cloud manufacturing is a specific implementation form of the "Internet + manufacturing" strategy. Why and how to develop cloud manufacturing platform(CMP), however, remains the key concern of both platform operators and users. A microscopic model is proposed to investigate advantages and diffusion forces of CMP through exploration of its diffusion process and mechanism. Specifically, a three-stage basic evolution process of CMP is innovatively proposed. Then, based on this basic process, a more complex CMP evolution model has been established in virtue of complex network theory, with five diffusion forces identified. Thereafter, simulations on CMP diffusion have been conducted. The results indicate that, CMP possesses better resource utilization,user satisfaction, and enterprise utility. Results of simulation on impacts of different diffusion forces show that both the time required for CMP to reach an equilibrium state and the final network size are affected simultaneously by the five diffusion forces. All these analyses indicate that CMP could create an open online cooperation environment and turns out to be an effective implementation of the "Internet + manufacturing" strategy.

关键词： complex network cloud manufacturing innovation diffusion network effect Gale-Shapley algorithm cooperative game theory

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Erratum: “simulation of chiral motion of excitation within the ground-state manifolds of neutral atoms” [APL Quantum 1, 036109 (2024)]

APL Quantum

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APL Quantum 2024年第3期1卷

作者： Hao-Yuan Tang Xiao-Xuan Li Jia-Bin You Xiao-Qiang Shao Center for Quantum Sciences and School of Physics Northeast Normal University Changchun 130024 China Sino-European Institute of Aviation Engineering Civil Aviation University of China Tianjin 300300 China Institute of High Performance Computing A*STAR (Agency for Science Technology and Research) 1 Fusionopolis Way Connexis Singapore 138632 Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education Northeast Normal University Changchun 130024 China

In the original version of this article initially published,1 there were still some typographical errors that should be corrected.

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simulation of chiral motion of excitation within the ground-state manifolds of neutral atoms

APL Quantum

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APL Quantum 2024年第3期1卷

Laser-induced gauge fields in neutral atoms serve as a means of mimicking the effects of a magnetic field, providing researchers with a platform to explore behaviors analogous to those observed in condensed matter systems under real magnetic fields. Here, we propose a method to generate chiral motion in atomic excitations within the neutral atomic ground-state manifolds. This is achieved through the application of polychromatic driving fields coupled to the ground–Rydberg transition, along with unconventional Rydberg pumping. The scheme offers the advantage of arbitrary adjustment of the effective magnetic flux by setting the relative phases between different external laser fields. In addition, the effective interaction strength between the atomic ground states can be maintained at 10 kHz, surpassing the capabilities of the previous approach utilizing Floquet modulation. Notably, the proposed method can be readily extended to implement a hexagonal neutral atom lattice, serving as the fundamental unit in realizing the Haldane model.

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Finite element simulation and experimental test of the wear behavior for self-lubricating spherical plain bearings

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Friction 2018年第3期6卷 297-306页

作者： Yahong XUE Jigang CHEN Sumin GUO Qingliang MENG Junting LUO School of Mechanical Engineering Yanshan University Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing Yanshan University Education Ministry Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University

In this study, based on the classical Archard adhesion wear theory, a three-dimensional finite element model was established, with the aim of simulating the failure process of self-lubricating spherical plain bearings in the swinging wear condition. The results show that the self-lubricating spherical plain bearings go through two different stages during the wear process, namely, initial wear stage and stable wear stage. Because the large contact points wear out during the initial wear stage, the maximum contact pressure decreases as the test period increases. The relatively larger wear depth region shows elliptical distribution, and the maximum distribution appears in the central contact area. The wear depth reaches 0.974 mm after swinging 25,000 times. PTFE fibers, which possess a good friction performance but poor abrasion resistance, abundantly exist on the friction surfaces of the fabric liner. Consequently, the friction torque during the initial wear stage is slightly smaller than the friction torque during the stable wear stage; however, the wear rate during the initial wear stage is high. The reliability and effectiveness of the finite element model are verified by experiment. The developed finite element model can be used for the analysis of the wear mechanisms of bearings and the prediction of the service life of bearings.

关键词： spherical plain bearing wear mechanisms wear depth contact pressure simulation

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Role of Left-Hand Cut Contributions on Pole Extractions from Lattice Data: Case Study for Tcc(3875)+

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Physical Review Letters 2023年第13期131卷 131903-131903页

作者： Meng-Lin Du Arseniy Filin Vadim Baru Xiang-Kun Dong Evgeny Epelbaum Feng-Kun Guo Christoph Hanhart Alexey Nefediev Juan Nieves Qian Wang School of Physics University of Electronic Science and Technology of China Chengdu 611731 China Institut für Theoretische Physik II Ruhr-Universität Bochum D-44780 Bochum Germany CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Peng Huanwu Collaborative Center for Research and Education Beihang University Beijing 100191 China Institute for Advanced Simulation Institut für Kernphysik and Jülich Center for Hadron Physics Forschungszentrum Jülich D-52425 Jülich Germany Jozef Stefan Institute Jamova 39 1000 Ljubljana Slovenia CeFEMA Center of Physics and Engineering of Advanced Materials Instituto Superior Técnico Avenida Rovisco Pais 1 1049-001 Lisboa Portugal Instituto de Física Corpuscular (centro mixto CSIC-UV) Institutos de Investigación de Paterna Apartado 22085 46071 Valencia Spain Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University Guangzhou 510006 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing Center South China Normal University Guangzhou 510006 China

We discuss recent lattice data for the Tcc(3875)+ state to stress, for the first time, a potentially strong impact of left-hand cuts from the one-pion exchange on the pole extraction for near-threshold exotic states. In particular, if the left-hand cut is located close to the two-particle threshold, which happens naturally in the DD* system for the pion mass exceeding its physical value, the effective-range expansion is valid only in a very limited energy range up to the cut and as such is of little use to reliably extract the poles. Then, an accurate extraction of the pole locations requires the one-pion exchange to be implemented explicitly into the scattering amplitudes. Our findings are general and potentially relevant for a wide class of hadronic near-threshold states.

关键词： Hadron-hadron interactions Heavy quark effective theory Lattice QCD Phenomenology Exotic mesons

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Ferroelectric control of single-molecule magnetism in 2D limit

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science Bulletin 2020年第15期65卷 1252-1259,M0003页

作者： Xinwei Wang Chengcheng Xiao Chao Yang Miaogen Chen Shengyuan A.Yang Jun Hu Zhaohui Ren Hui Pan Wenguang Zhu Zhu-An Xu Yunhao Lu State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Departments of Materials and the Thomas Young Centre for Theory and Simulation of Materials Imperial College LondonLondon SW72AZUK Department of Physics China Jiliang University.Hangzhou 310018China Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingapore 487372Singapore School of Physical Science and Technology Soochow UniversitySuzhou 215006China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao SARChina ICQD Hefei National Laboratory for Physical Science at the MicroscaleKey Laboratory of Strongly-Coupled Quantum Matter PhysicsChinese Academy of SciencesDepartment of Physicsand Synergetic Innovation Center of Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310027China Collaborative Innovation Centre of Advanced Microstructures Nanjing UniversityNanjing 210093China

The electric control of magnetic properties based on magnetoelectric effect is crucial for the development of future data storage ***,based on first-principles calculations,a strong magnetoelectric effect is proposed to effectively switch on/off the magnetic states as well as alter the in-plane/perpendicular easy axes of metal-phthalocyanine molecules(MPc)by reversing the electric polarization of the underlying two-dimensional(2D)ferroelectric a-In2Se3 substrate with the application of an external electric *** mechanism originates from the different hybridization between the molecule and the ferroelectric substrate in which the different electronic states of surface Se layer play a dominant ***,the magnetic moments and magnetic anisotropy energies(MAE)of OsPc/In2Se3 can be further largely enhanced by a functionalized atom atop the OsPc *** I-OsPc/In2Se3 system possesses large MAE up to 30 meV at both polarization directions,which is sufficient for room-temperature *** findings provide a feasible scheme to realize ferroelectric control of magnetic states in 2D limit,which have great potential for applications in nanoscale electronics and spintronics.

关键词： Magnetoelectric effect Two-dimensional ferroelectric Single-molecular magnets In2Se3 Metal-phthalocyanine molecules

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Numerical investigation of screech tones in 3-D modes by using an inviscid approach 48

Numerical investigation of screech tones in 3-D modes by usi...

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48th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2019 MADRID

作者： Lee, Incheol Lee, Duck Joo Beijing Aeronautical Science and Technology Research Institute of COMAC Beijing Key Laboratory of Simulation Technology for Civil Aircraft Design China North of Future Science Park Changping District Beijing102211 China Korea Advanced Institute of Science and Technology 291 Daehak-Ro Yuseong-Gu Daejeon34141 Korea Republic of

ISBN: (纸本)9788487985317

Screech tones from supersonic inviscid jet were numerically investigated using computational aeroacoustics methods. A fourth order optimized compact scheme and fourth order Runge-Kutta scheme were used to solve three dimensional Euler equations. The tool was validated at the conditions of two supersonic flows: one is a perfectly expanded jet, and the other is three under-expanded jets. Extensive analysis was performed to investigate the characteristics of two three-dimensional modes, known as B and C modes, of screech tones including two mode transitions for various Mach numbers from 1.2 to 1.9. The directivity of a B-mode screech is investigated with the spectra of a Mach 1.3 jet. The directivity of B-mode screech tones is similar to the directivity of an acoustic dipole, whereas the directivity of C-mode screech tones is close to the directivity of an acoustic monopole. The wavelengths and amplitude of the reproduced screech tones showed good agreement with other results. The azimuthal directivity of both B and C modes becomes asymmetric after the second mode transition. It can be concluded that the present inviscid tool can numerically reproduce the screech tone including its non-linear mode transition without considering a viscous effect. © INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering. All Rights Reserved.

关键词： Feedback

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Microstructures and mechanical properties of friction stir welds on 9% Cr reduced activation ferritic/martensitic steel

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Journal of Materials science & technology 2018年第5期34卷 756-766页

作者： Chao Zhang Lei Cui Yongchang Liu Chenxi Liu Huijun Li State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science & EngineeringTianjin University Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and EngineeringTianjin University

In this study,the microstructures and mechanical properties of 9%Cr reduced activation ferritic/martensitic（RAFM） steel friction stir welded joints were *** a W-Re tool is used,the recommended welding parameters are 300 rpm rotational speed,60 mm/min welding speed and10 kn axial *** stir zone（SZ）,austenite dynamic recrystallization induced by plastic deformation and the high cooling rates lead to an obvious refinement of prior austenite grains and martensite *** microstructure in SZ contains lath martensite with high dislocation density,a lot of nano-sized MX and M3C phase particles,but almost no M23C6 *** thermal mechanically affect zone（TMAZ）and heat affect zone（HAZ）,refinement of prior austenite and martensitic laths and partial dissolution of M（23）C6 precipitates are obtained at relatively low rotational ***,with the increase of heat input,coarsening of martensitic laths,prior austenite grains,and complete dissolution of M23C6 precipitates are *** toughness of SZ at-20℃ is slightly lower than that of base material（BM）,and exhibits a decreasing trend with the increase of rotational speed.

关键词： Friction stir welding Reduced activation ferritic/martensitic steel Microstructure evolution Impact toughness

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