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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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Dflow, a Python framework for constructing cloud-native AI-for-Science workflows

arXiv

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arXiv 2024年

作者： Liu, Xinzijian Han, Yanbo Li, Zhuoyuan Fan, Jiahao Zhang, Chengqian Zeng, Jinzhe Shan, Yifan Yuan, Yannan Xu, Wei-Hong Liu, Yun-Pei Zhang, Yuzhi Wen, Tongqi York, Darrin M. Zhong, Zhicheng Zheng, Hang Cheng, Jun Zhang, Linfeng Wang, Han DP Technology Beijing100080 China Institute of Molecular Science and Applied Chemistry School of Chemistry Xi'an Jiaotong University Xi'An710049 China Department of Mechanical Engineering The University of Hong Kong Hong Kong School of Physics Peking University Beijing100871 China AI for Science Institute Beijing100080 China HEDPS CAPT College of Engineering Peking University Beijing100871 China Laboratory for Biomolecular Simulation Research Center for Integrative Proteomics Research Department of Chemistry and Chemical Biology Rutgers University PiscatawayNJ08854-8087 United States Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China IKKEM Xiamen361005 China State Key Laboratory of Physical Chemistry of Solid Surface Collaborative Innovation Center of Chemistry for Energy Materials College of Chemistry and Chemical Engineering Xiamen University Xiamen361005 China Department of Physics University of Science and Technology of China Hefei230026 China Suzhou Institute for Advanced Research University of Science and Technology of China Suzhou215123 China Institute of Artificial Intelligence Xiamen University Xiamen361005 China Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing100094 China

In the AI-for-science era, scientific computing scenarios such as concurrent learning and high-throughput computing demand a new generation of infrastructure that supports scalable computing resources and automated workflow management on both cloud and high-performance supercomputers. Here we introduce Dflow, an open-source Python toolkit designed for scientists to construct workflows with simple programming interfaces. It enables complex process control and task scheduling across a distributed, heterogeneous infrastructure, leveraging containers and Kubernetes for flexibility. Dflow is highly observable and can scale to thousands of concurrent nodes per workflow, enhancing the efficiency of complex scientific computing tasks. The basic unit in Dflow, known as an Operation (OP), is reusable and independent of the underlying infrastructure or context. Dozens of workflow projects have been developed based on Dflow, spanning a wide range of projects. We anticipate that the reusability of Dflow and its components will encourage more scientists to publish their workflows and OP components. These components, in turn, can be adapted and reused in various contexts, fostering greater collaboration and innovation in the scientific community. Copyright © 2024, The Authors. All rights reserved.

关键词： Reusability

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The Effects of Parameter Variations on the Torque Control of Induction Motor

The Effects of Parameter Variations on the Torque Control of...

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Conference on Vehicle Control and Intelligence (CVCI)

作者： Feixiang Zhao Jianwei Zhang Dongmei Wu Guoqing Liu Wensong Lang Pinglai Wang Automotive Research Institute China National Heavy Duty Truck Group Co.ltd. Jinan China State Key Laboratory of Automotive Simulation and Control Jilin University Changchun China Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan China

ISBN: (数字)9781728184975

ISBN: (纸本)9781728184982

By analyzing the principle and method of the direct vector control torque control method for induction motor, an analysis method of the influence of motor parameter changes on the accuracy of motor electromagnetic torque control under steady-state conditions is proposed, and the application of four common flux observations is derived. In direct vector control, the error function of the electromagnetic torque is estimated. The influence of the change of induction motor parameters on the torque control accuracy is theoretically analyzed, and the simulation is verified by Simulink. The simulation proves that the method can correctly analyze the torque control accuracy under the condition of induction motor vector control without complicated calculations.

关键词： Resistance Inductance Torque Induction motors Torque control Stators Observers

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Omitted variable bias in single-pollutant epidemiological models for estimating long-term health effects of ambient fine particulate matter and ozone

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Journal of Hazardous Materials 2025年 494卷 138590页

作者： Xue, Tao Deng, Jianyu Ni, Xueqiu Kang, Ning Tong, Mingkun Li, Pengfei School of Public Health Peking University Health Science Centre Beijing100191 China Advanced Institute of Information Technology Peking University Hangzhou311215 China State Key Joint Laboratory of Environment Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing100871 China Institute of Medical Technology Peking University Health Science Centre Beijing100191 China

Long-term exposure to PM2.5 and O3 is linked to various adverse health outcomes. However, many epidemiological studies on their health effects use single-pollutant models, leading to omitted variable bias (OVB). The percent bias, based on the classical OVB formula, depends on the PM2.5-O3 correlation and unobservable true effects. Data were sourced from two recent meta-analyses of the log-linear link between all-cause mortality and per-unit exposure to PM2.5 or O3. We then developed a new meta-regression method to correct biases, and its performance was verified through simulation. The OVB for PM2.5 or O3 can vary greatly from positive to negative across different spatial scales (like country, sub-national region, or city). By applying this method to 24 individual estimates, we found that a 10 μg/m³ increase in PM2.5 was linked to a 7.4 % increase in all-cause mortality risk, while O3’s association with all-cause mortality was not significant, which implies that PM2.5 must be considered in epidemiological analyses to obtain reliable effect estimates for O3. Our findings offer novel methodologies for the systematic assessment of the health effects of multiple pollutants. This contribution holds significant potential in fortifying health intervention strategies and minimizing the health risks posed by air pollution to the public. © 2025 Elsevier B.V.

关键词： Air quality

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Giant anomalous Nernst effect in noncollinear antiferromagnetic Mn-based antiperovskite nitrides

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Physical Review Materials 2020年第2期4卷 024408-024408页

作者： Xiaodong Zhou Jan-Philipp Hanke Wanxiang Feng Stefan Blügel Yuriy Mokrousov Yugui Yao Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of Education School of Physics Beijing Institute of Technology Beijing 100081 China Peter Grünberg Institut and Institute for Advanced Simulation Forschungszentrum Jülich and JARA 52425 Jülich Germany Institute of Physics Johannes Gutenberg University Mainz 55099 Mainz Germany

The anomalous Nernst effect (ANE)—the generation of a transverse electric voltage by a longitudinal heat current in conducting ferromagnets or antiferromagnets—is an appealing approach for thermoelectric power generation in spin caloritronics. The ANE in antiferromagnets is particularly convenient for the fabrication of highly efficient and densely integrated thermopiles as lateral configurations of thermoelectric modules increase the coverage of heat source without suffering from the stray fields that are intrinsic to ferromagnets. In this work, using first-principles calculations together with a group theory analysis, we systematically investigate the spin-order-dependent ANE in noncollinear antiferromagnetic Mn-based antiperovskite nitrides Mn3XN(X=Ga, Zn, Ag, and Ni). The ANE in Mn3XN is forbidden by symmetry in the R1 phase but amounts to its maximum value in the R3 phase. Among all Mn3XN compounds, Mn3NiN presents the most significant anomalous Nernst conductivity of 1.80AK−1m−1 at 200 K, which can be further enhanced if strain, electric, or magnetic fields are applied. The ANE in Mn3NiN, being one order of magnitude larger than that in the famous Mn3Sn, is the largest one discovered in antiferromagnets so far. The giant ANE in Mn3NiN originates from the sharp slope of the anomalous Hall conductivity at the Fermi energy, which can be understood well from the Mott relation. Our findings provide a host material for realizing antiferromagnetic spin caloritronics that promises exciting applications in energy conversion and information processing.

关键词： Spintronics Thermoelectric effects Antiferromagnets First-principles calculations

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Control strategy of doubly-fed induction generator during the grid voltage swell

Control strategy of doubly-fed induction generator during th...

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作者： Le, Zou Xueguang, Wu Longze, Kou Dong, Liu Fangyuan, Li Mingxiao, Han North China Electronic Power University Beijing China Global Energy Interconnection Research Institute Beijing China Beijing Key Laboratory of DC grid Technology and Simulation Beijing China State Key Laboratory of Advanced Power Transmission Technology Beijing China

This study firstly derives the relationship between the grid voltage and the rotor current of doubly-fed induction generator (DFIG) during the grid voltage swell. Then, an effective control strategy aiming to restrain rotor over-current is proposed and the control strategy of the grid-side converter is also improved. The proposed rotor current suppression and grid voltage suppression method, cooperating with the DC chopper, can not only solve the problem of short circuit of the rotor side converter resulting from the frequent switching of crowbar device, but also maximally improve the capability of wind turbine in dynamic reactive power support without adding any other power electronic devices. With the help of this control strategy, the wind turbine could maintain its normal operation even during the fault and the high voltage ride through of wind turbine can be achieved. As a result, the stability of the wind power integration is significantly improved. Finally, the simulations and analysis in the power systems computer aided design (PSCAD)/electromagnetic transients including DC (EMTDC) verify the effectiveness and feasibility of the proposed control scheme. © 2019 Institution of Engineering and *** right reserved.

关键词： Wind turbines

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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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Study on the Dissolution Mechanism of aviation Hydraulic Oil–Nitrogen Gas Based on Molecular Dynamics

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Processes 2025年第5期13卷 1564-1564页

作者： Qingtai Guo Changming Zhang Hui Zhang Tianlei Zhang Dehai Meng School of Mechanical Engineering Shaanxi University of Technology Hanzhong 723001 China Engineering Research Center of Manufacturing and Testing for Landing Gear and Aircraft Structural Parts Universities of Shaanxi Province Hanzhong 723001 China Shaanxi Key Laboratory of Advanced Manufacturing and Health Management for Aviation Components Universities of Shaanxi Province Hanzhong 723001 China Shaanxi Provincial “Four Main Bodies and One Union” University-Enterprise Joint Research Center for Aircraft Landing Gear Advanced Manufacturing and Aviation Component Performance Test Shaanxi University of Technology Hanzhong 723001 China School of Materials Science and Engineering Shaanxi University of Technology Hanzhong 723001 China School of Chemical and Environmental Sciences Shaanxi University of Technology Hanzhong 723001 China

The shock absorbers in the landing gear absorb and dissipate a significant amount of kinetic energy generated from impacts during the landing and taxiing phases to ensure the stability and safety of the aircraft. The nitrogen–oil binary system is a commonly used energy absorption medium in these shock absorbers. Nevertheless, the interplay of interfacial mass transfer dynamics, microscopic dissolution behavior, and pressure drop in the aviation hydraulic oil–N2 system under landing conditions necessitates further elucidation. Thus, we investigated the interfacial mass transfer characteristics of the oil–gas mixing process using molecular dynamics (MD) for analyzing the dissolution mechanism of N2 in the aviation hydraulic oil system. The results show that as system pressure and temperature increase, the degree of oil–gas mixing intensifies. Under conditions of 373 K, 35 MPa and 433 K, 20 MPa, the diffusion coefficient, interfacial thickness, and system energy reach their maximum values. An increase in system pressure facilitates the occurrence of oil–gas mixing until the interface disappears at the minimum miscibility pressure (MMP), with the obtained MMP value being 107 MPa. Finally, the solubility of N2 molecules in aviation hydraulic oil under different conditions was statistically analyzed, which is identified as the root cause of the pressure drop in the shock absorber’s gas chamber. This study innovatively applies molecular dynamics simulations to unveil, for the first time, the dissolution mechanism of N2 in aviation hydraulic oil at the molecular scale, overcoming experimental limitations in observing extreme pressure–temperature conditions. This research elucidates the behavior of aviation hydraulic oil and N2 under different thermodynamic conditions, making it easier to capture the patterns of phenomena that are difficult to observe in extreme environments. The research findings not only enhance the microscopic understanding of oil–gas mixing within the sh

关键词： molecular dynamics simulation oil–gas miscibility N dissolved interface characteristic microscopic mechanism

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Microstructure and Mechanical Properties of AISI 304L Austenitic Stainless Steel Processed by Various Schedules of Rolling 7

Microstructure and Mechanical Properties of AISI 304L Austen...

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7th All-Russian Conference on Nanomaterials, NANO 2020

作者： Raab, A.G. Raab, G.I. Tokar, A.A. Rybalchenko, O.V. Belyakov, A.N. Dobatkin, S.V. La, P. Institute of Physics of Advanced Materials Ufa State Aviation Technical University K. Marx st. 12 Ufa450008 Russia A A Baikov Institute of Metallurgy and Materials Science of Ras Leninsky pr. 49 Moscow119334 Russia Belgorod State University Pobeda st. 85 Belgorod308015 Russia State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou China National University of Science and Technology "misis" Leninskiy pr. 4 Moscow119049 Russia

The paper studies various rolling schedules implemented at 500°C (incl. direct, reverse, and cross rolling) and their effect on the structure formation and mechanical properties in AISI 304L stainless steel samples. Both TEM and SEM research techniques were applied. An ultrafine grain-subgrain microstructure was found to be formed inside elongated original grains. Rolling-processed microstructural elements were close in their size with the minimum value observed after a reverse rolling (240 nm). Mechanical properties were studied using microhardness measurements and tensile testing revealing a considerable increase in strength accompanied by a density reduction upon deformation. The strength values in the material subjected to all three rolling schedules are relatively close to the highest yield strength and ultimate tensile stress observed after reverse rolling with a strain degree of 70%. © Published under licence by IOP Publishing Ltd.

关键词： Tensile testing

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