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第40届中国控制会议

作者： Yu Zhang Ming Chen Shuo Cai Shengyan Hou Hai Yin Jinwu Gao State Key Laboratory of Automotive Simulation and Control Jilin University Department of Control Science and Engineering Jilin UniversityCampus Nanling Advanced Technology Center Dongfeng Motor Corporation

As a new energy vehicle, fuel cell hybrid electric vehicle（FCHEV） has a broad development prospect and provides a new way of thinking to solve the energy crisis. Energy management strategy is one of the key issues in the research of *** are many power sources of the driveline system. Effective management of energy flows in power sources is the key to improving vehicle performance. Aiming at the FCHEV, an equivalent fuel consumption minimum control strategy（ECMS） was proposed to achieve the optimal fuel economy and real-time ***, the fuel cell hybrid vehicle is modeled based on ADVISOR. Secondly, the online real-time energy management strategy ECMS is designed. Finally, the results of the NEDC and UDDS cycle are compared with the global optimal results of offline dynamic programming（DP）. The results show that compared with the global optimal DP hydrogen consumption, the ECMS control strategy in this paper is only 0.59% and 2.10% different,but 13.31% and 12.28% higher than that of the rule-based CD-CS control strategy. In the following hardware loop experiment,the ECMS energy management strategy also improved by 5.00% and 5.64% compared to the CD-CS results. It is proved that the ECMS strategy in this paper has good control effects.

关键词： Fuel cell hybrid electric vehicle Energy management strategy ADVISOR ECMS Optimization

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Preparation of Sa508 Gr.3 Steel by Selective Laser Melting: Role of Volumetric Energy Density on Densification, Microstructure and Mechanical Properties

SSRN

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SSRN 2022年

作者： Liu, Yiru Ding, Ran Han, Ying Wang, Hui Guo, Qianying Ma, Zongqing Liu, Yongchang State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science and Engineering Tianjin University Tianjin China Key Laboratory of Advanced Structural Materials Ministry of Education School of Materials Science and Engineering Changchun University of Technology Changchun130012 China School of Mechanical Engineering Chengdu University Chengdu China

In this work, the effect of volumetric energy density (VED) on densification, microstructure and mechanical properties of SA508 Gr.3 steel produced by selective laser melting (SLM) was studied. As the VED gradually increases, the relative density of the specimens first increases and then decreases. It is determined that the VED range which can obtain the specimens with the highest relative density (99.4 ± 0.3%) is 111-133 J/mm3. The formation mechanism of the defects in the SLM manufactured specimens with excessively high or low VEDs was explored. In addition, the microstructure of the specimens in the horizontal and vertical planes both exhibit the tempered martensite with a small amount of retained austenite. On the basis, the specimens with the highest relative density (99.4 ± 0.3%) possess the highest hardness (320.04 ± 7 HV), strength (1041 ± 6 MPa) and elongation (19 ± 3%) compared to the other specimens with the excessively high and low VEDs. © 2022, The Authors. All rights reserved.

关键词： Microstructure

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Ternary quasifission in collisions of actinide nuclei

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Physical Review C 2024年第2期109卷 024316-024316页

作者： D. D. Zhang B. Li D. Vretenar T. Nikšić Z. X. Ren P. W. Zhao J. Meng State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing 100871 China Physics Department Faculty of Science University of Zagreb 10000 Zagreb Croatia Institut für Kernphysik Institute for Advanced Simulation and Jülich Center for Hadron Physics Forschungszentrum Jülich D-52425 Jülich Germany Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics Universität Bonn D-53115 Bonn Germany

The microscopic framework of time-dependent covariant density functional theory is applied to a systematic study of ternary quasifission in collisions of pairs of U238 nuclei. It is shown that the inclusion of octupole degree of freedom in the case of head-to-head collisions extends the energy window in which ternary quasifission occurs, and greatly enhances the number of nucleons contained in a middle fragment. Dynamical pairing correlations, included here in the time-dependent Bardeen-Cooper-Schrieffer approximation, prevent the occurrence of ternary quasifission in head-to-head collisions, and have an effect on the location of the energy window in which a middle fragment is formed in tail-to-tail collisions. In the latter case, as well as for tail-to-side collisions, the formation of very heavy neutron-rich systems in certain energy intervals is predicted.

关键词： Fission Nuclear density functional theory Nuclear structure & decays

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Revisiting mid-long term ecosystem services projections: Integrating the interaction effects of future climate and land use changes

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Fundamental Research 2024年

作者： Yang, Qing Liu, Gengyuan Gonella, Francesco Wang, Qingrui Chen, Shiju Yang, Zhifeng Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal University Zhuhai 519087 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China Department of Molecular Sciences and Nanosystems Ca’ Foscari University of Venice Venezia Mestre 30170 Italy State Key Laboratory of Coal Combustion Huazhong University of Science and Technology Wuhan 430074 China Beijing Tengjing Big Data Research Institute Beijing 100020 China Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education School of Ecology Environment and Resources Guangdong University of Technology Guangzhou 510006 China

Two of the most critical issues of sustainability are how future ecosystem services (ES) will change under natural and artificial stressors. To answer the above problems accurately with a quantitative manner and develop an intelligent and sustainable management of ecosystems, the projections of ES considering climate change under different Shared Socioeconomic Pathways (SSPs) are needed. However, current ES projection studies often lack quantitative methods to simulate ES dynamics, especially incapability to integrate the interactions between climate and land use changes on ES dynamics. To overcome these challenges, this study proposes a framework for ES simulation under climate and land use change stressors. The framework developed includes four modules: climatic attributes simulation, land use change simulation, scenario design, and ecosystem services simulation modules. Taking China as a case study, this study simulated the evolution of China's ES under the interactions between climate and land use change during the period of 2020–2100. The simulation results show that China's ES increases by 33%, 34%, 9%, and 60% under scenarios SSP1, SSP2, SSP3, and SSP5, respectively. Additionally, the overall growth rate of ES decreases by a gradually slowing rate from the mean at 1% during 2000–2020 to 0.5% during 2020–2100, respectively. Meanwhile, the ES in China shows significantly spatial variability based on simulation results. Shandong province yields the largest potential to be the key area with ES declining in the future. At ecosystem scale, increases in woodland ES are expected to dominate China's ES growth continuously. In the first four decades (2020–2060), development ways under SSP1 scenario are more helpful to promote increase in subtypes of ES, while in the last four decades (2060–2100), ES are expected to increase under SSP5 scenario. The key contributions of this study include tracking the causation and revealing the influencing mechanism of interactions of

关键词： Climate change Ecosystem conservation and management Ecosystem services Land use change Shared socioeconomic pathways (SSPs)

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Research on the design of smart morphing long-endurance UAVs

Research on the design of smart morphing long-endurance UAVs

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作者： Ma, T. Liu, Y. Yang, D. Zhang, Z. Wang, X. Hao, S. Beijing Advanced Subject Center of Advanced Unmanned Aerial Vehicles Key Laboratory of Advanced Technology of Intelligent Unmanned Flight System Ministry of Industry and Information Technology Institute of Unmanned System Beihang University Beijing China School of Aeronautic Science and Engineering Beihang University Beijing China SATM Cranfield University Cranfield United Kingdom School of Aeronautic Science and Engineering Beihang University Beijing China School of Aeronautic Science and Engineering Hiwing General Aviation Equipment Co. LTD Beihang University Beijing China

To improve the endurance performance of long-endurance Unmanned Aerial Vehicles (UAVs), a smart morphing method to adjust the UAV and flight mode continuously during flight is proposed. Using this method as a starting point, a smart morphing long-endurance UAV design is conducted and the resulting improvement in the endurance performance studied. Firstly, the initial overall design of the smart morphing long-endurance UAV is carried out, then the morphing form is designed and various control parameters are selected. Secondly, based on multi-agent theory, an architecture for the smart morphing control system is built and the workflow of the smart morphing control system is planned. The morphing decision method is designed in detail based on the particle swarm optimisation algorithm. Finally, a simulation of the smart morphing approach in the climb and cruise stages is carried out to quantitatively verify the improvement in the endurance performance. The simulation results show that the smart morphing method can improve the cruise time by 4.1% with the same fuel consumption. ©

关键词： Antennas

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Association of PM_(2.5)Reduction with Improved Kidney Function:A Nationwide Quasiexperiment among Chinese Adults

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Health Data Science 2022年第1期2022卷 115-123页

作者： Yiqun Han Tao Xue Frank J.Kelly Yixuan Zheng Yao Yao Jiajianghui Li Jiwei Li Chun Fan Pengfei Li Tong Zhu Environmental Research Group MRC Centre for Environment and HealthImperial College LondonLondonUK BIC-ESAT and SKL-ESPC College of Environmental Sciences and EngineeringCenter for Environment and HealthPeking UniversityBeijing 100871China Institute of Reproductive and Child Health/Ministry of Health Key Laboratory of Reproductive Health and Department of Epidemiology and Biostatistics School of Public HealthPeking UniversityBeijingChina Center of Air Quality Simulation and System Analysis Chinese Academy of Environmental Planning100012 BeijingChina China Center for Health Development Studies Peking UniversityBeijingChina College of Computer Science and Technology Zhejiang UniversityHangzhouChina Computer Center Peking University and Peng Cheng LaboratoryChina Advanced Institute of Information Technology Peking UniversityChina

*** evidence from human studies has revealed the adverse impact of ambient fine particles(PM_(2.5))on health outcomes related to metabolic disorders and distant *** exposure to ambient PM_(2.5)leads to kidney impairment remains *** rapid air quality improvement driven by the clean air actions in China since 2013 provides an opportunity for a quasiexperiment to investigate the beneficial effect of PM_(2.5)reduction on kidney *** on two repeated nationwide surveys of the same population of 5115 adults in 2011 and 2015,we conducted a difference-indifference *** in long-term exposure to ambient PM_(2.5)were associated with changes in kidney function biomarkers,including estimated glomerular filtration rate by serum creatinine(GFRscr)or cystatin C(GFRcys),blood urea nitrogen(BUN),and uric acid(UA).*** a 10μg/m^(3)reduction in PM_(2.5),a significant improvement was observed for multiple kidney functional biomarkers,including GFRscr,BUN and UA,with a change of 0.42(95%confidence interval[CI]:0.06,0.78)mL/min/1.73m^(2),-0.38(-0.64,-0.12)mg/dL,and-0.06(-0.12,-0.00)mg/dL,respectively.A lower socioeconomic status,indicated by rural residence or low educational level,enhanced the adverse effect of PM_(2.5)on kidney *** results support a significant nephrotoxicity of PM_(2.5)based on multiple serum biomarkers and indicate a beneficial effect of improved air quality on kidney function.

关键词： Kidney organs ambient

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The Study of Pt/Zeolites for Co Oxidation: Effects of Skeleton Structure and Si/Al Ratio

SSRN

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SSRN 2023年

作者： Tian, Xudong Shan, Yulong Yu, Yunbo Zhang, Jian Yan, Zidi Sun, Yu Ding, Wenqing School of Rare Earths University of Science and Technology of China Hefei230026 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing100029 China

Effects of framework and Si/Al of Pt/zeolites on CO catalytic oxidation were investigated. CO conversion increased with decreasing pore size and increasing Si/Al. The optimized Pt/CHA with Si/Al of 17 showed the highest activity, achieving complete CO conversion below 140 °C. The large CHA cavity plays important role, which lead to higher CO conversion of Pt/CHA than Pt/BEA and Pt/MFI zeolites. Increasing Si/Al favors the presence of Pt0, which showed excellent CO catalytic oxidation ability. The framework with high Si/Al protected Pt0 from accumulating and dealumination during hydrothermal aging, resulting in high hydrothermal stability. © 2023, The Authors. All rights reserved.

关键词： Zeolites

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A New SINS/USBL Integration Navigation with the Unknown Position of the Transponder

A New SINS/USBL Integration Navigation with the Unknown Posi...

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International Conference on Robotics and Automation Engineering (ICRAE)

作者： Maodong Xia Tao Zhang Liang Zhang Bo Yang School of Instrument Science & Engineering Southeast University Nanjing China Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology Ministry of Education Southeast University Nanjing China Interdisciplinary Division of Aeronautical and Aviation Engineering Hong Kong Polytechnic University Hong Kong China

Autonomous underwater vehicles (AUV) are viewed as the carrier for marine resource exploitation and utilization, which need accurate navigation information. The main navigation mode of AUV is based on the strap-down inertial system (SINS), assisted by the ultra-short baseline system (USBL). Traditional SINS/USBL integration navigations are under the assumption that the precise position of the transponder is obtained in advance by the long baseline system (LBL), which increases the complexity of system operations. Therefore, a new integration navigation with the unknown position of the transponder is proposed. State vectors are augmented, which additionally contain the position errors of the transponder. Modified state and measurement equations are established, respectively. The optimal position errors of AUV and the transponder are got simultaneously by the Kalman filter. The mathematical simulation is performed to show the superiority of the proposed algorithm.

关键词： Autonomous underwater vehicles Automation Navigation Systems operation Filtering algorithms Mathematical models Calibration

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Harmonic Stability Analysis and Damping Strategy for DC system of MMC-HVDC Across Wide Frequency Range

Harmonic Stability Analysis and Damping Strategy for DC syst...

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International Conference on Power System technology (POWERCON)

作者： Longze Kou Yixuan Peng Ke Ji Lin Zhu Feng Ji Dong Liu State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co. Ltd Beijing China Beijing Key Laboratory of DC Grid Technology & Simulation Global Energy Interconnection Research Institute Co. Ltd Beijing China

ISBN: (纸本)9781665407380

The harmonic resonance and instability problems become prominent in recent years with the development and application of modular multilevel converter (MMC) based HVDC system. The impedance model of MMC can be used to facilitate the analysis of harmonic stability and the design of mitigation method. In this paper, the accurate dc impedance model of MMC is firstly derived based on harmonic state space (HSS) method. The internal dynamics and control actions (control loop delay included) of MMC are considered in the derivation process. With consideration of impedance characteristics of dc transmission lines, the harmonic stability for the dc system of MMC-HVDC are theoretically analyzed across a wide frequency range and the possible harmonic resonance problems are revealed. On this basis, a modified dc damping control is proposed to mitigate the harmonic resonances and improve the harmonic stability at all possible frequency points. At last, the proposed model and control method are validated by simulation results.

关键词： Damping Analytical models Resonant frequency Power system stability Harmonic analysis Stability analysis Impedance

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key Techniques on Unified Identity Authentication in OpenMBEE Integration

Key Techniques on Unified Identity Authentication in OpenMBE...

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IEEE International Conference on Electronics and Communication Engineering (ICECE)

作者： Junjie Xue Junhua Zhou Guoqiang Shi Chaoqun Feng Penghua Liu Hongyan Quan Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing Simulation Center Beijing China State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System Engineering Beijing China Beijing Simulation Center Science and Technology on Space System Simulation Laboratory Beijing China School of Computer Science and Technology East China Normal University Shanghai China

ISBN: (纸本)9781728188577

In order to make full use of the concept of model-based systems engineering (MBSE) and the collaborative design capability of the open model-based engineering environment (OpenMBEE) in establishing complex product development platform, we propose an effective method to solve the problem of unified identity authentication in OpenMBEE integration. The proposed method is based on the Model View Controller(MVC) architecture in OpenMBEE, which has the characteristics strong plasticity and can be benefit for expanding the function in the controller layer. In our research, we make full use of the Software Development Kit (SDK) of OpenMBEE to expand the existing functions in the controller layer, and increase the function of communicating with the application development platform, then realize the function of sharing user authentication information between the development platform and OpenMBEE. After expansion, the system includes three modules, including the Front-end Service Module(FSM), MQ based Information Receiving Service Module(IFRSM), and the OpenMBEE Backend Server Module(BSM). The effectiveness of the proposed strategies is verified by some practical instances, which verifies that our study can provide an effective design idea for the identity authentication in OpenMBEE integration.

关键词： Analytical models Databases Authentication Computer architecture Control systems Data models Software

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