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Towards sustainable and intelligent urban transportation: A novel deep transfer reinforcement learning framework for eco-driving of fuel cell buses

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Energy 2025年 330卷

作者： Ruchen Huang Hongwen He Qicong Su Jingda Wu National Key Laboratory of Advanced Vehicle Integration and Control Beijing Institute of Technology Beijing 100081 China School of Mechanical Engineering Beijing Institute of Technology Beijing 100081 China School of Engineering and Design Technical University of Munich Munich 80333 Germany Department of Aeronautical and Aviation Engineering The Hong Kong Polytechnic University Hong Kong

Eco-driving is a sustainable technology that optimizes both energy management and speed planning for electrified vehicles. Particularly when combined with emerging deep reinforcement learning (DRL) techniques, eco-driving strategies (EDSs) can be more intelligent. However, current research on eco-driving, namely the holistic solution, lags behind the advancements in its sub-problem namely energy management, and the development of DRL-based EDSs remains time-consuming. Since energy management is a sub-task of eco-driving, it offers a potential way to rapidly develop EDSs by reusing pre-trained energy management strategies (EMSs). Based on this, this paper proposes an expedited method for developing soft actor-critic (SAC) based EDSs for fuel cell buses (FCBs) in the vehicle-following scenario. To ensure that SAC-based EMSs can be effectively transferred to EDSs, an innovative heterogeneous deep transfer reinforcement learning framework is designed. Within this framework, all the knowledge learned in the source EMS can be transferred and reused by the target EDS. More importantly, the transferability of heterogeneous deep neural networks and heterogeneous experience replay buffers is particularly verified. simulation results show that the proposed framework provides a 71.01 % acceleration in convergence speed and a 7.30 % improvement in fuel economy. This article contributes to correlating different optimization tasks of FCBs through advanced artificial intelligence technologies.

关键词： Deep reinforcement learning

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One-proton emission from 148−151Lu in the DRHBc+WKB approach

arXiv

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arXiv 2023年

作者： Xiao, Yang Xu, Si-Zhe Zheng, Ru-You Sun, Xiang-Xiang Geng, Li-Sheng Zhang, Shi-Sheng School of Space and Environment Beihang University Beijing102206 China School of Physics Beihang University Beijing102206 China Institut für Kernphysik Institute for Advanced Simulation Jülich Center for Hadron Physics Forschungszentrum Jülich JülichD-52425 Germany School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing100049 China Peng Huanwu Collaborative Center for Research and Education Beihang University Beijing100191 China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang University Beijing102206 China Institute of Modern Physics Chinese Academy of Sciences Guangdong Province Huizhou516000 China

One-proton radioactivity in 149Lu, the latest identified proton emitter, is studied in the Wentzel-Kramers-Brillouin (WKB) approach with the proton-nucleus potential extracted from the deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc) for the first time. The predicted half-life turns out to be consistent with the experimental measurement within uncertainties and (almost) independent of the density functionals in the DRHBc theory. Such a microscopic self-consistent calculation reveals that 149Lu is oblately deformed with a quadrupole deformation β2 ≈ −0.18, and rules out the possibility of a prolate quadrupole deformation suggested in the nonadiabatic quasiparticle model. We also check the validity of this approach in the description of 150,151Lu and their isomeric states. The deviations of the predicted half-lives from their experimental counterparts are mostly smaller than those of the theoretical studies without considering deformation effects. Furthermore, we predict 148Lu to be a more oblately deformed proton-emitter with a longer half-life than that of 149Lu, which can be checked in the future. Our studies show that the DRHBc + WKB approach provides a new alternative method to evaluate the half-lives of well-deformed proton emitters. © 2023, CC BY.

关键词： Uncertainty analysis

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Preface

Engineering Applications of Computational Methods

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Engineering Applications of Computational Methods 2023年 13卷 V页

作者： Wen, Chih-Yung Jiang, Yazhong Shi, Lisong Department of Aeronautical and Aviation Engineering Faculty of Engineering The Hong Kong Polytechnic University Hong Kong Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of Science Wuhan University of Technology Hubei Wuhan China

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Hierarchical negative stiffness mechanical metamaterials

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Smart Materials and Structures 2025年第6期34卷 065008-065008页

作者： Qibo Qin Xin Liu Jianhao Man Bo Cao Bing Wang Xiaojun Tan School of Civil Aviation Northwestern Polytechnical University Xi’an 710072 Shaanxi People’s Republic of China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150080 Heilongjiang People’s Republic of China School of Mechanical Engineering Hebei University of Technology 300401 Tianjin People’s Republic of China

Negative stiffness mechanical metamaterials (NSMMs) have enormous application potential in fields such as energy absorption due to their unique mechanical properties. Currently, a large number of NSMMs with novel configurations have been proposed, greatly enriching the concept of such structural materials. However, the hierarchical structural design approach, commonly used in periodic structures, has not been applied in the design of NSMMs. This study proposes a new type of NSMM with hierarchical structural characteristics. Through experiments and numerical simulations, the mechanical properties and energy absorption performance of this hierarchical negative stiffness metamaterial were studied. The effects of structural parameters on the performance characteristics were analyzed, and a comparison was made between this hierarchical structure and traditional structures. The study shows that the hierarchical design can effectively optimize the mechanical response curve of NSMMs, constructing a flatter stress platform, which promotes the enhancement of energy absorption performance for such structures.

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Fully secure decentralized ciphertext-policy attribute-based encryption in standard model 14th

Fully secure decentralized ciphertext-policy attribute-based...

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14th International Conference on Information Security and Cryptology, Inscrypt 2018

作者： Ma, Chuangui Ge, Aijun Zhang, Jie Army Aviation Institute Beijing China Key Laboratory of Cryptologic Technology and Information Security Ministry of Education Shandong University Jinan China State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

ISBN: (纸本)9783030142339

In this paper, we introduce a new multi-authority ciphertext policy attribute-based encryption (MA-CP-ABE) system. In our system, there are multiple central authorities (CAs) and attribute authorities (AAs). The CAs will not need to coordinate or even be aware of each other, and so do the AAs. In particular, we present two constructions that will be proved secure in the standard model. Our first scheme is fully secure under static assumptions in composite-order bilinear group, and can work for any monotone access structure. The second one achieves constant size ciphertexts for AND-gate policy in prime-order group. The security can be proved under the decisional linear (DLIN) assumption. © 2019, Springer Nature Switzerland AG.

关键词： Cryptography

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General way to define tunneling time

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Chinese Physics B 2019年第5期28卷 27-31页

作者： Zheng Shu Xiaolei Hao Weidong Li Jing Chen Institute of Applied Physics and Computational Mathematics Institute of Theoretical Physics and Department of Physics State Key Laboratory of Quantum Optics and Quantum Optics DevicesCollaborative Innovation Center of Extreme Optics Shanxi University High Energy Density Physics Simulation (HEDPS) Center for Applied Physics and Technology Peking University Center for Advanced Material Diagnostic Technology Shenzhen Technology University

With the development of attosecond science, tunneling time can now be measured experimentally with the attoclock technique. However, there are many different theoretical definitions of tunneling time and no consensus has been ***, we bridge the relationship between different definitions of tunneling time based on a quantum travel time in onedimensional rectangular barrier tunneling problem. We find that the real quantum travel time t_(Re) is equal to the Bohmian time t_(Bohmian), which is related to the resonance lifetime of a bound state. The total quantum travel time τt can perfectly retrieve the transversal time t_x and the Büttiker–Landauer time τ_(BL) in two opposite limits, regardless of the particle energy.

关键词： tunneling time Büttiker–Landauer time Bohmian time

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New insights into the oscillations of the nucleon electromagnetic form factors

arXiv

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arXiv 2022年

作者： Yang, Qin-He Guo, Di Dai, Ling-Yun Haidenbauer, Johann Kang, Xian-Wei Meisner, Ulf-G. School of Physics and Electronics Hunan University Changsha410082 China Hunan Provincial Key Laboratory of High-Energy Scale Physics and Applications Hunan University Changsha410082 China Institute for Advanced Simulation Institut für Kernphysik Jülich Center for Hadron Physics Forschungszentrum Jülich JülichD-52425 Germany Key Laboratory of Beam Technology of the Ministry of Education College of Nuclear Science and Technology Beijing Normal University Beijing100875 China Institute of Radiation Technology Beijing Academy of Science and Technology Beijing100875 China Helmholtz Institut für Strahlen- und Kernphysik Bethe Center for Theoretical Physics Universität Bonn BonnD-53115 Germany Tbilisi State University Tbilisi0186 Georgia

The electromagnetic form factors of the proton and the neutron in the timelike region are investigated. Electron-positron annihilation into antinucleon-nucleon (N¯ N) pairs is treated in distorted wave Born approximation, including the final-state interaction in the N¯ N system. The latter is obtained by a Lippmann-Schwinger equation for N¯ N potentials derived within SU(3) chiral effective field theory. By fitting to the phase shifts and (differential) cross section data, a high quality description is achieved. With these amplitudes, the oscillations of the electromagnetic form factors of the proton and the neutron are studied. It is found that each of them can be described by two fractional oscillators. One is characterized as 'overdamped' and dominates near the threshold, while the other is 'underdamped' and plays an important role in the high-energy region. These two oscillators are essential to understand the distributions of polarized electric charges induced by hard photons for the nucleons. Copyright © 2022, The Authors. All rights reserved.

关键词： Born approximation

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Localised evaporative emission inventory of gasoline vehicle volatile organic compounds (VOCs) in China: Insights into regional variations and driving behaviours

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Environmental Pollution 2025年 382卷

作者： Chunxiao Hao Dailin Yin Junfang Wang Hang Yin Xiao Guo Jia Ke Qingyan Liu Yunshan Ge Guangyu Dou National Laboratory of Automotive Performance & Emission Test School of Mechanical Engineering Beijing Institute of Technology Beijing 100081 China Key Laboratory of Vehicle Emission Control and Simulation of Ministry of Ecology and Environment Chinese Research Academy of Environmental Sciences Beijing 100012 China CATARC Automotive Test Center Tianjin Co. Ltd Tianjin 300300 China Institute of Advanced Technology University of Science and Technology of China Hefei 230026 China

Evaporative emission from gasoline vehicles is a major source of volatile organic compounds (VOCs) in China. This study developed a localised evaporative emission model that incorporated key factors, such as fuel vapour pressure, temperature variations, fuel tank volume, carbon canister size, mileage, and parking behaviour. Drawing from the American MOVES and European COPERT models and combining with the real situation in China, the study created an emission inventory categorised by vehicle types, emission standards, emission processes, and regions. It also estimated changes in evaporative emissions under the influence of climate change. The results revealed that, in 2020, evaporative emissions from gasoline vehicles in China reached 517,000 tonnes, with diurnal and hot soak emissions contributing the largest share (63 %). By 2025, these emissions are projected to increase to 602,000 tonnes before declining to 408,000 tonnes by 2030. Furthermore, the characteristics of evaporative emissions vary significantly by region and driving behaviour, with particularly high emissions observed in Guangdong and other provinces. Therefore, future air pollution prevention and control strategies in China should consider these regional and behavioural variations. From the perspective of the classification of this study, targeting evaporative emissions in 13 key provinces can effectively control 66 % of the total VOCs emissions of the nation.

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Modeling of service correlation for service composition in cloud manufacturing 31

Modeling of service correlation for service composition in c...

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31st European Modeling and simulation Symposium, EMSS 2019

作者： Wang, Fei Laili, Yuanjun Zhang, Lin Xing, Chi Guo, Liqin School of Automation Science and Electrical Engineering Beihang University China Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation Center China State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System Engineering Beijing Simulation Center China Science and Technology on Space System Simulation Laboratory Beijing Simulation Center China

ISBN: (纸本)9788885741263

Cloud manufacturing (CMfg), integrating distributed manufacturing resources as services to cloud center, aims at intelligent, green, and economic customized manufacturing. The optimal composition of services to fulfill particular manufacturing requirement is a core issue to realize efficient cloud manufacturing. Many researchers have studied the problem considering the Quality-of-Service (QoS) of independent services. However, the correlation between services is rarely considered. In this paper, the importance of service correlation is emphasized. Two kinds of service correlation, service exclusion and service collaboration, are modeled for service composition. An improved algorithm DET, which combines Differential Evolution Algorithm (DE) with a Tabu table based on service exclusive and collaborative relationships, is designed to filter composable services and find better solutions for complex tasks. Experiments have shown the effects of service correlation on the quality of composed services and demonstrated the effectiveness of the proposed method DET compared with traditional DE. © 2019 Dime Universita di Genova, DIMEG University of Calabria.

关键词： Quality of service

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Feasibility study of NiCoCrFeAl0 .8 Si 0.1 (NbMoTaW) 0.1 denary alloy as a bond coat for thermal barrier coatings: from structural stability to high-temperature oxidation behavior

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Surface and Coatings technology 2025年 512卷

作者： Zhuo Chen Yongzhi Jing Chao Zhang Xiufang Cui Wei Xu Xiang Wang Yongchao Fang Dechang Ma Guo Jin Institute of Surface/Interface Science and Technology Key Laboratory of Superlight Material and Surface Technology of Ministry of Education College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001 China Northwest Institute for Nonferrous Metal Research Xi an 710016 China No.703 Research Institute China State Shipbuilding Co. Ltd. Harbin 150078 China The Military Industry Program Evaluation Center of Costind of SASTIND Beijing 100048 China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Beijing Beijing Institute of Aeronautical Materials Beijing 100095 China

In this study, the feasibility of NiCoCrFeAl 0.8 Si 0.1 (NbMoTaW) 0.1 complex concentrated alloy as a bond coat for thermal barrier coatings (TBCs) was investigated. The alloy bond coat was prepared using plasma spraying technology and compared with the conventional NiCoCrAlY bond coat. The phase composition and microstructural changes of the NiCoCrFeAl 0.8 Si 0.1 (NbMoTaW) 0.1 alloy before and after plasma deposition were analyzed, and the thermal expansion coefficients, microhardness, and oxidation resistance of the two coatings were evaluated. Additionally, a Yttria-Stabilized Zirconia (YSZ) ceramic layer was deposited on the surfaces of both bond coats, forming a complete TBC system, and the evolution of the thermally grown oxide (TGO) layer was studied under different oxidation stages. Results indicate that after plasma spraying, the denary alloy bond coat maintains a single-phase BCC structure with slight compositional segregation, dense microstructure, and effective suppression of segregation of refractory elements due to its high aluminum content. The thermal expansion coefficient of the alloy is comparable to that of NiCoCrAlY, but its microhardness is nearly double that of NiCoCrAlY, with a more uniform hardness distribution. Oxidation testing at 1100 °C revealed that the TGO growth rate of the NiCoCrFeAl-based bond coat TBC is 36 % lower than that of the NiCoCrAlY-based system, demonstrating superior oxidation resistance. This improvement is attributed to the active elements such as Si, Nb, and Mo, which promote the formation of a protective Cr/Al dual-layer oxide film, effectively slowing down further oxidation, internal stress, and the formation of spinel. These findings suggest that the NiCoCrFeAl 0.8 Si 0.1 (NbMoTaW) 0.1 complex concentrated alloy has the potential to serve as a high-performance bond coat in TBC systems, providing superior oxidation resistance, thermal expansion matching, and mechanical integrity at high temperatures.

关键词： Thermal barrier coatings

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