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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 126661页

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.

关键词： Climate change impact Emission inventory Evaporative emission Gasoline vehicles Regional emission variation Volatile organic compounds

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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 NiCoCrFeAl0.8Si0.1(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： Chen, Zhuo Jing, Yongzhi Zhang, Chao Cui, Xiufang Xu, Wei Wang, Xiang Fang, Yongchao Ma, Dechang Jin, Guo 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 Harbin150001 China Northwest Institute for Nonferrous Metal Research Xi an710016 China No.703 Research Institute China State Shipbuilding Co. Ltd. Harbin150078 China The Military Industry Program Evaluation Center of Costind of SASTIND Beijing100048 China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Beijing Beijing Institute of Aeronautical Materials Beijing100095 China

In this study, the feasibility of NiCoCrFeAl0.8Si0.1(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 NiCoCrFeAl0.8Si0.1(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 NiCoCrFeAl0.8Si0.1(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. © 2025 Elsevier B.V.

关键词： Thermal barrier coatings

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Ozonation as an efficient pretreatment method to alleviate reverse osmosis membrane fouling caused by complexes of humic acid and calcium ion

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Frontiers of Environmental Science & Engineering 2019年第4期13卷 89-100页

作者： Xuehao Zhao Yinhu Wu Xue Zhang Xin Tong Tong Yu Yunhong Wang Nozomu Ikuno Kazuki Ishii Hongying Hu Environmental Simulation and Pollution Control State Key Joint Laboratory State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC)School of EnvironmentTsinghua UniversityBeijing 100084China Collaborative Innovation Center for Advanced Nuclear Energy Technology Institute of Nuclear and New Energy TechnologyTsinghua UniversityBeijing 100084China Kurita Water Industries Ltd. Nakano-kuTokyo 164-0001Japan Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen InstituteShenzhen 518055China

Humic acid has been considered as one of the most significant sources in feed water causing organic fouling of reverse osmosis (RO) membranes, but the relationship between the fouling behavior of humic acid and the change of its molecular structure has not been well developed yet. In this study, the RO membrane fouling behavior of humic acid was studied systematically with ozonation as a pretreatment method to control RO membrane fouling. Furthermore, the effect of ozone on the structure ofhumic acid was also explored to reveal the mechanisms. Humic acid alone (10-90 mg/L, in deionized water) was found not to cause obvious RO membrane fouling in 45-h operation. However, the presence of Ca^2+ aggravated significantly the RO membrane fouling caused by humic acid, with significant flux reduction and denser fouling layer on RO membrane, as it was observed by scanning electron microscope (SEM) and atomic force microscope (AFM). However, after the pretreatment by ozone, the influence of Ca^2+ was almost eliminated. Further analysis revealed that the addition of Ca^2+ increased the particle size of humic acid solution significantly, while ozonation reduced the SUVA254, particle size and molecular weight of the complexes of humic acid and Ca^2+(HA-Ca^2+ complexes). According to these results and literature, the bridge effect of Ca^2+ aggregating humic acid molecules and the cleavage effect of ozone breaking HA-Ca^2+ complexes were summarized. The change of the structure of humic acid under the effect of Ca^2+ and ozone is closely related to the change of its membrane fouling behavior.

关键词： Reverse osmosis Membrane fouling Humic acid Ca^2+ Ozone

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Observation of a Strongly Isospin-Mixed Doublet in Si26 via β-Delayed Two-Proton Decay of P26

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Physical Review Letters 2022年第24期129卷 242502-242502页

作者： J. J. Liu (刘嘉健) X. X. Xu (徐新星) L. J. Sun (孙立杰) C. X. Yuan (袁岑溪) K. Kaneko (金子和也) Y. Sun (孙扬) P. F. Liang (梁鹏飞) H. Y. Wu (吴鸿毅) G. Z. Shi (石国柱) C. J. Lin (林承键) J. Lee (李晓菁) S. M. Wang (王思敏) C. Qi (亓冲) J. G. Li (李健国) H. H. Li (李红蕙) Latsamy Xayavong Z. H. Li (李智焕) P. J. Li (李朋杰) Y. Y. Yang (杨彦云) H. Jian (简豪) Y. F. Gao (高雨枫) R. Fan (范锐) S. X. Zha (查思贤) F. C. Dai (戴凡超) H. F. Zhu (朱浩钒) J. H. Li (李金海) Z. F. Chang (常志芳) S. L. Qin (覃淑炼) Z. Z. Zhang (张朝展) B. S. Cai (蔡博帅) R. F. Chen (陈若富) J. S. Wang (王建松) D. X. Wang (王东玺) 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) 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) L. Y. Hu (胡力元) X. Wang (王翔) H. L. Zang (臧宏亮) K. L. Wang (王凯龙) B. Ding (丁兵) 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) H. S. Xu (徐瑚珊) X. H. Zhou (周小红) Y. H. Zhang (张玉虎) Z. G. Hu (胡正国) 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 Department of Physics The University of Hong Kong Hong Kong China Department of Nuclear Physics China Institute of Atomic Energy Beijing 102413 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing 100049 China Advanced Energy Science and Technology Guangdong Laboratory Huizhou 516003 China School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China National Superconducting Cyclotron Laboratory Michigan State University East Lansing Michigan 48824 USA Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen University Zhuhai 519082 China Department of Physics Kyushu Sangyo University Fukuoka 813-8503 Japan State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing 100871 China College of Physics and Technology & Guangxi Key Laboratory of Nuclear Physics and Technology Guangxi Normal University Guilin 541004 China Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) Institute of Modern Physics Fudan University Shanghai 200433 China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan University Shanghai 200438 China KTH Royal Institute of Technology SE-100 44 Stockholm Sweden Department of Physics Faculty of Natural Sciences National University of Laos Vientiane 01080 Laos College of Science Huzhou University Huzhou 313000 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 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 6

β decay of proton-rich nuclei plays an important role in exploring isospin mixing. The β decay of P26 at the proton drip line is studied using double-sided silicon strip detectors operating in conjunction with high-purity germanium detectors. The T=2 isobaric analog state (IAS) at 13 055 keV and two new high-lying states at 13 380 and 11 912 keV in Si26 are unambiguously identified through β-delayed two-proton emission (β2p). Angular correlations of two protons emitted from Si26 excited states populated by P26 β decay are measured, which suggests that the two protons are emitted mainly sequentially. We report the first observation of a strongly isospin-mixed doublet that deexcites mainly via two-proton decay. The isospin mixing matrix element between the Si26 IAS and the nearby 13 380-keV state is determined to be 130(21) keV, and this result represents the strongest mixing, highest excitation energy, and largest level spacing of a doublet ever observed in β-decay experiments.

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

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Unusual Ordering Behavior of Co3al-Based Γ′ Phase with L12 Structure Predicted by the Thermodynamic Model with Support of First-Principles Calculations

SSRN

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SSRN 2022年

作者： Ali, Hamid Chen, Rong Chen, Hailian Zhao, Yan Zhao, Panhong Yang, Shuwen Wu, Bo Wen, Jiansen Zhang, Chubo Weng, Liangji Xie, Tianliang Cai, Qi Zhang, Longkun He, Zhihan Yao, Qipeng Zhang, Haifeng Sa, Baisheng Wen, Cuilian Lin, Maohua Liu, Yu Wang, Chunxu Multiscale Computational Materials Facility Key Laboratory of Eco-Materials Advanced Technology College of Materials Science and Engineering Fuzhou University Fuzhou350100 China Materials Design and Manufacture Simulation Facility School of Advance Manufacturing Fuzhou University Jinjiang 362200 China Department of Ocean and Mechanical Engineering Florida Atlantic University Florida Boca Raton33431 United States Central Iron & Steel Research Institute Group Beijing100081 China

The temperature and composition-dependent site preferences of the binary Co3Al, ternary, and quaternary Co3Al-based γ′ phase alloyed with Mi (Mi = Cr, Cu, Fe, Mn, Mo, Ni, Re, Ta, Ti, V, or W) were calculated for the first time using a two-sublattice thermodynamic model involving site occupying fractions (SOFs). The SOFs were calculated using a thermodynamic software package based on a thermodynamic database established in this work, where the temperature-dependent thermodynamic data were obtained using first-principles and phonon spectrum calculations. There is an obvious order-disorder transition for the stoichiometric and non-stoichiometric binary Co3Al as well as in ternary and quaternary Co3Al-based γ′ phase around the solvus temperature, while this character was not found in its counterpart Ni3Al-based γ′ phase. The additional alloying elements Mi modulate the order-disorder transition characteristics of Co3Al-based γ′-precipitate with different amplitudes. Based on the causal relationship of structure and mechanical properties, according to the modulating amplitude of the order-disorder transition behavior, we recommend that adding the additional alloying elements such as Cu, Mn, and Mo atoms make the mechanical properties degrade gradually, and thus the structural components avoid sudden damage, which is beneficial for the safety of the engine component at high operating temperature. © 2022, The Authors. All rights reserved.

关键词： Binary alloys

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Flexible rotor optimization design with considering the uncertainty of unbalance distribution

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International Journal for simulation and Multidisciplinary Design Optimization 2020年第1期11卷

作者： Jia, Shengxi Zheng, Longxi Mei, Qing School of Power and Energy Northwestern Polytechnical University Xi'an710072 China Collaborative Inovation Center of Advanced Aero-Engine Beijing100191 China Aviation Key Laboratory of Aeroengine Vibration Technology AVIC Aviation Powerplant Research Institute Zhuzhou412000 China

A flexible rotor optimization design considering the uncertainty of the unbalance is carried out in this paper. Assuming that the magnitude and phase of unbalance obey normal distribution and uniform distribution respectively, the uncertainty can be quantitatively described. The classical 6 Sigma method is used to perform uncertain optimization design of the rotor system considering this uncertainty. The theoretical results are verified by experiments in which 36 sets of unbalance are artificially distributed to the rotor to simulate the uncertainty. In experiment, the amplitude response of the two disks and the acceleration response of the two bearings are decreased by 14%, 21.5%, 37.2% and 46% respectively in terms of standard deviation. It can be concluded that the optimization design considering the uncertainty can reduce the fluctuation of the response and improving the robustness of the results. © S. Jia et al., published by EDP Sciences, 2020.

关键词： Normal distribution

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Monitoring of sugarcane crop based on time series of sentinel-1 data

Monitoring of sugarcane crop based on time series of sentine...

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2019 SAR in Big Data Era, BIGSARDATA 2019

作者： Li, HongZhong Yuan, Xing Han, Yu Chen, JinSong Chen, XiaoNing Shenzhen Institutes of Advanced Technology CAS Key Laboratory of Urban Land Resources Monitoring and Simulation Ministry of Land and Resources Shenzhen China CAS Shenzhen Institutes of Advanced Technology Shenzhen China College of Geomatics Xian University of Science and Technology Xi'an China

ISBN: (纸本)9781728126531

Monitoring the spatial pattern and growth of sugarcane timely and accurately is of great importance at regional and global scales. In this paper, the focus was on sugarcane identification in Southern China with FuSui country as the study area. Classification was based on sentinel-1 different polarizations and sugarcane phenology. In order to explore the optimum periods and polar metric characters, time series of C-band dual polarization sentinel-1 data in 2017 totally 130 images were collected over the whole sugarcane growth season. Then the growth curve was built based on the former exploration. After that, there was a following analysis by combining growth curve and polarimetric characters of sugarcane, which contributes to setting attribute to identity. At last, the advanced rules were built to identify sugarcane according to growth curve above and subordinating degree function. Sugarcane extraction accuracy was verified by numerous ground data. The conclusions are as follows: (1)The results of this study show the importance of using C-band muti-temporal dual polarization data on crop identification especially for sugarcane comparing with traditional optical data. In other words, it's crucial for crop identification to extract the backscattering coefficient. When combining with a part of samples, the curve of crop growth used for classification can be portrayed. To deepen the difference between sugarcane and other typical features, additional three kinds of reference object like eucalyptus, water and buildings, all of which distributes in the experimental area, with an extensive representation. (2)The analysis of polarimetric characters has shown that the inherent SAR backscatter feature VH is superior in classification accuracy to the VV, which achieved an accuracy of 88.07%. During the stage of seedling and tillering, the amplitude from sugarcane is higher than that in other objects, proving the advantage of VV in sugarcane identification. On the contrary, the

关键词： Time series

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Correction: a novel non-vacuum packaged triaxial accelerometer with differential dual-axis resonantors and torsional elements

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Microsystem Technologies 2023年第1期30卷 45-45页

作者： Li, Jinhui Xia, Dunzhu Wang, Songli Yang, Xiuhua Zhang, Bing Key Laboratory of Micro-lnertial Instruments and Advanced Navigation Technology Ministry of Education Nanjing China School of Instrument Science and Engineering Southeast University Nanjing China Xi’an Flight Automatic Control Research Institute of Aviation Industry Xi’an China

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