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Nash-equilibrium strategies of orbital TargetAttacker-Defender game with a non-maneuvering target

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Chinese Journal of Aeronautics 2024年第10期37卷 365-379页

作者： Yifeng LI Xi LIANG zhaohui DANG school of Astronautics Northwestern Polytechnical UniversityXi’an 710072China Beijing Institute of Astronautical systems.engineering Beijing 100076China

This study investigates the orbital Target-Attacker-Defender(TAD)game problem in the context of space *** this game,the Attacker and the Defender compete for a Target that is unable to maneuver due to its original mission *** paper establishes three TAD game models based on the thrust output capabilities:unconstrained thrust output,thrust constrained by an upper bound,and fixed thrust *** models are then solved using differential game theory to obtain Nash equilibrium solutions for the game problems,and the correctness and effectiveness of the solution methods are verified through ***,an analysis of the winning mechanisms of the game is conducted,identifying key factors that influence the game’s outcomes,including weight coefficients in payoffs,the maximum thrust acceleration limit,and the initial game *** the unique characteristics of space missions,a specific focus is given to the analysis of the Defender’s initial states in the hovering formation and in-plane circling formation,revealing overall success patterns for defense strategies from these two *** summary,this study provides valuable insights into the control strategies and winning mechanisms of orbital TAD games,deepening our understanding of these games and offering practical guidance to improve success rates in real-world s.enarios.

关键词： Target-Attacker-Defender problem Differential game TPBVP Continuous thrust Orbital game

Parametric formation control of multiple nanosatellites for cooperative observation of China space station

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Astrodynamics 2024年第1期8卷 77-95页

作者： Hao Zhou Bohan Jiao zhaohui Dang Jianping Yuan school of Astronautics Northwestern Polytechnical UniversityXi’an710072China National Key Laboratory of Aerospace Flight Dynamics Northwestern Polytechnical UniversityXi’an710072China

This study proposes a parametric formation control method for the cooperative observation of the China space station(Css)using multiple ***,a simplified geometrical model of the Css is constructed using fundamental solids,such as the capsule body and ***,the spacecraft formation configuration for the observation mission is characterized by a three-dimensional(3D)Lissajous curve using related design parameters under the full-coverage observation requirements of specific parts,such as the Css connecting section and collision avoidance ***,a double-layer control law is designed for each nanosatellite,in which the upper layer is a distributed observer for recognizing the target formation configuration parameters,and the lower layer is a trajectory-tracking controller to make the nanosatellite converge to its temporary target position calculated from the upper layer’s *** closed-loop control stability is proven under the condition that the communication network topology of the nanosatellite cluster contains a directed spanning ***,the control method is verified by numerical simulation,where the Css connecting section is selected as the observation target,and ten small nanosatellites are assumed to perform the cooperative observation *** simulation results demonstrate that the double-layer control law is robust to single-point communication failures and suitable for the accompanying missions of large space objects with multiple nanosatellites.

关键词： China space station(Css) cooperative observation parametric formation 3D Lissajous curve double-layer system

enhancing AI system Privacy:An Automatic Tool for Achieving GDPR Compliance in NosQL Databases

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Computers, Materials & Continua 2024年第7期80卷 217-234页

作者： Yifei Zhao zhaohui Li siyi Lv College of Cyber science Nankai UniversityTianjin300350China

The EU’s Artificial Intelligence Act(AI Act)imposes requirements for the privacy compliance of AI *** systems must comply with privacy laws such as the GDPR when providing *** laws provide users with the right to issue a Data subject Access Request(DsAR).Responding to such requests requires database administrators to identify information related to an individual ***,manual compliance poses significant challenges and is *** administrators need to write queries through time-consuming *** demand for large amounts of data by AI systems has driven the development of NosQL *** to the flexible schema of NosQL databases,identifying personal information becomes even more *** paper develops an automated tool to identify personal information that can help organizations respond to *** tool employs a combination of various technologies,including schema extraction of NosQL databases and relationship identification from query *** describe the algorithm used by our tool,detailing how it discovers and extracts implicit relationships from NosQL databases and generates relationship graphs to help developers accurately identify personal *** evaluate our tool on three datasets,covering different database designs,achieving an F1 score of 0.77 to *** results demonstrate that our tool successfully identifies information relevant to the data *** tool reduces manual effort and simplifies GDPR compliance,showing practical application value in enhancing the privacy performance of NOsQL databases and AI systems.

关键词： GDPR compliance NosQL databases AI system privacy

Data Quality Control Method of a New Drifting Observation Technology Named Drifting Air-sea Interface Buoy

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Journal of Ocean University of China 2024年第1期23卷 11-22页

作者： LI shuo WANG Bin DenG Zeng’an WU Baoqin ZHU Xiande CHen zhaohui National Ocean Technology Center Tianjin 300112China school of Marine science and Technology Tianjin UniversityTianjin 300072China Key Laboratory of Ocean Observation Technology Ministry of Natural ResourcesTianjin 300112China People’s Liberation Army 92859 Tianjin 300061China Physical Oceanography Laboratory Ocean University of ChinaQingdao 266100China

An integral quality control(QC)procedure that integrates various QC methods and considers the design indexes and operational status of the instruments for the observations of drifting air-sea interface buoy was developed in the order of basic in-spection followed by targeted *** innovative method of combining a moving Hampel filter and local anomaly detection com-plies with statistical laws and physical processes,which guarantees the QC performance of meteorological *** sets of observation data were used to verify the applicability and effectiveness of the QC procedure,and the effect was evaluated using the observations of the Kuroshio Extension Observatory buoy as the *** results showed that the outliers in the time series can be correctly identified and processed,and the quality of data improved *** linear correlation between the quality-controlled observations and the reference increased,and the difference *** correlation coefficient of wind speed before and after QC increased from 0.77 to 0.82,and the maximum absolute error decreased by approximately 2.8ms^(-1).In addition,air pressure and relative humidity were optimized by 10^(-3)–10^(-2) orders of *** the sea surface temperature,the weight of coefficients of the continuity test algorithm was optimized based on the sea area of data acquisition,which effectively expanded the applicability of the algorithm.

关键词： drifting air-sea interface buoy quality control oceanic variables meteorological variables continuity test

The first factor affecting dryland winter wheat grain yield under various mulching measures: spike number

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Journal of Integrative Agriculture 2024年第3期23卷 836-848页

作者： Yingxia Dou Hubing Zhao Huimin Yang Tao Wang Guanfei Liu zhaohui Wang sukhdev Malhi Coliege of Natural Resources and environment Northwest A&F UniversityYangling 712100China Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of Agriculture and Rural AffairsYangling 712100China Department of Renewable Resources University of AlbertaEdmonton T6G 2H1Canada

Water is the key factor limiting dryland wheat grain *** affects crop yield and yield components by affecting soil *** research is needed to determine the relationships between yield components and soil moisture with yield,and to identify the most important factor affecting grain yield under various mulching measures.A long-term 9-yearifeld experiment in the Loess Plateau of Northwest China was carried out with three treatments:no mulch (CK),plastic mulch (M_(P)) and straw mulch (M_(s)).Yield factors and soil moisture were measured,and the relationships between them were explored by correlation analysis,structural equation modeling and significance *** results showed that compared with CK,the average grain yields of M_(P) and M_(s) increased by 13.0and 10.6%,*** average annual grain yield of the M_(P) treatment was 134 kg ha^(–1) higher than the M_(s) *** were no significant differences in yield components among the three treatments (Psoil water storage of the M_(s) treatment was greater than the M_(P) treatment,although the differences were not statistically *** water storage during the summer fallow period (sWssF) and soil water storage before sowing (sWss) of M_(s) were significantly higher than in CK,which increased by 38.5 and 13.6%,*** relationship between M_(P) and CK was not statistically significant for sWssF,but the sWss in M_(P) was significantly higher than in *** terms of soil water storage after harvest (sWsH) and water consumption in the growth period(ET),there were no signi?cant differences among the three *** on the three analysis methods,we found that spike number and ET were positively correlated with grain ***,the relative importance of spike number to yield was the greatest in the M_(P )and M_(s) treatments,while that of ET was the greatest in *** sWssF could indirectly increase spike number and ET in the three treatments.B

关键词： dryland winter wheat plastic mulch spike number straw mulch

Digital Transformation and Green Technology Innovation in Manufacturing enterprises: A study Based on Big Data Text Mining

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Frontiers of Business Research in China 2024年第3期18卷 298-317页

作者： YIN Ximing WANG zhaohui CHen Jin LI Jizhen school of Management and Economics Bejing Institute of TechnologyBejing 100081China HKU Business school The University of Hong KongHong Kong 999077China school of Economics and Management Tsinghua UniversityBejing 100084China

Digital transformation serves as a new driving force and engine for enterprise ***,the national strategy of carbon peaking and carbon neutrality has set new goals and requirements for the green development of the Chinese manufacturing *** the three-dimensional perspective of"strategy-resource-institution,"this paper explores the impact and mechanism of digital transformation on green technology innovation of Chinese manufacturing enterprises and the heterogeneous impact of the institutional logic of ownership *** a sample of 1,016 A-share listed manufacturing companies on the shanghai and s.enzhen stock Exchanges from 2011 to 2019 and based on big data text mining and a negative binomial regression model,this study finds that:(1)Digital strategy significantly enhances green technology innovation capability of enterprises;(2)digital resource investment partially mediates the effect of digital strategy on the enhancement of green technology innovation capability;and(3)the ownership structure of enterprises plays a moderating role in the mediating relationship mentioned ***,compared to state-owned enterprises(sOEs),non-state-owned enterprises(NsOEs)show no significant difference in the stages where digital strategy promotes green technology innovation and guides digital resource ***,they demonstrate higher efficiency in transforming digital resource investment into green technology *** robustness test indicates that the significant effect of digital strategy and resource investment on green technology innovation in enterprises remains valid in the medium term,with a continuous.enabling *** is no significant difference between sOEs and NsOEs in the medium and long term in promoting green technology innovation through digital ***,introducing keyword text networks to explore the structural impact of digital strategy,this study finds that digital product and manufact

关键词： digital transformation carbon peaking and carbon neutrality green technology innovation strategy resource-based view(RBV)

Implications of agricultural success in the Yellow River Basin and its strategy for green development

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Frontiers of Agricultural science and engineering 2024年第1期11卷 122-133页

作者： Gang HE zhaohui WANG Qichao ZHU Jianbo s.en Fusuo ZHANG College of Natural Resources and environment Northwest A&F UniversityYangling 712100China Key Laboratory of Low-carbon Green Agriculture in Northwestern China Ministry of Agriculture and Rural AffairsBeijing 100125China College of Resources and environmental sciences National Academy of Agriculture Green DevelopmentChina Agricultural UniversityBeijing 100193China

The Yellow River Basin is an important food production area and an ecological challenge for China, where environmental protection and water scarcity are the major constraints. For the upper reaches of the Yellow River Basin,optimizing the adoption of chemicals in agricultural production and integrating crops with livestock are the key strategies for protecting the *** dryland agriculture in the middle and upper reaches, this study summarizes four aspects of efficient precipitation techniques in terms of collection,storage, conservation, and use, which have greatly improved crop yields and supported dryland crop production. Irrigated agriculture in the middle and lower reaches is the core area of China's grain production, where the area under water-saving irrigation reached 13.0 Mha in 2018, greatly improving water use. Compared with 1998, cereal production in 2018 increased by 62.2 Mt under similar total water withdrawals(49.7 billion to 51.6 billion m~3),and the annual soil erosion at the Tongguan Hydrological Observatory reduced by 584 million m~3 in 2018, achieving great success in environmental protection and efficient water use. The Chinese government has set a goal for the Yellow River Basin to become the national leader in environmental protection and efficient water use by 2035. such a high demand requires the combined efforts of the whole community, as well as the adoption of new technologies,coordinated basin-wide development, and adequate policy support.

关键词： Ecological agriculture drylands agriculture irrigation water-saving technology policy support

High cerium content(Nd-Pr-Ce)_(2)Fe_(14)B melt-spun ribbons with high coercivity

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Journal of Rare Earths 2024年第4期42卷 690-695页

作者： Yujiang Zhong Junming Wang Zikai Yuan Ruijin Liu Minggang Zhu Zhe Liu Xin Chen Wei Li zhaohui Guo Division of Functional Materials Central Iron and Steel Research InstituteBeijing100081China Ningbo Jinji strong Magnetic Material Co. Ltd.Ningbo315172China Jiangxi Jiangwu Rare Metal New Material Co. Ltd.Nanchang330013China

The effects of wheel speeds on the magnetic properties and microstructures of[(Nd,Pr)_(1-x)Ce_(x)]-Fe-B meltspun ribbons were *** to melt-spun ribbons with low cerium(Ce)content(x=0.2),amorphous formation can be suppressed at high wheel speed in the ribbons with a relatively high Ce content(x=0.8),and with the increase of the wheel speed,the magnetic properties of the ribbons with high Ce content raise *** high wheel speed,the coercivity mechanism of melt-spun ribbons is mainly pinning field,and the high wheel speed introduces a large number of defects into the matrix as pinning ***,ribbons with high Ce content form a fine and uniform grain structure,so the grain boundary area enlarges,which further hinders the movement of domain *** combined effects of the above factors.enable ribbons with high Ce content to have excellent magnetic properties(Hcj=0.977 T,Mr=64 m^(2) A/kg)at the wheel speed of 35 m/s.

关键词： Wheel speed Cecontent Microstructure Magnetic properties Rare earths

Comparative Effectiveness of Mobile Health-Based Comprehensive smoking Cessation Modalities and Traditional Clinic-Delivered Treatments—Beijing Municipality,China,May 2022 to April 2024

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China CDC weekly 2024年第22期6卷 516-521页

作者： shuilian Chu Hang Jing Di Zhang Yuan Cao Yunliang Qian Xiurong Liu Lin Xiao zhaohui Tong Lirong Liang Department of Research on Tobacco Dependence Therapies Beijing Institute of Respiratory Medicine and Beijing Chao-Yang HospitalCapital Medical UniversityBeijingChina Beijing Center for Disease Prevention and Control BeijingChina Tobacco Control Office Chinese Center for Disease Control and PreventionBeijingChina Department of Respiratory and Critical Care Medicine Beijing Institute of Respiratory Medicine and Beijing Chao-Yang HospitalCapital Medical UniversityBeijingChina

What is already known about this topic?Most Chinese smokers have not accessed professional help due to a lack of sufficient smoking cessation *** health(mHealth)can mitigate obstacles related to time and transportation,thereby providing effective support for smokers seeking to *** is added by this report?This study offers real-world evidence supporting the effectiveness of mHealth-based comprehensive smoking cessation *** findings indicate that these modalities can significantly enhance abstinence rates,albeit to a lesser extent compared to traditional clinicbased *** to the intervention was identified as a critical factor influencing the effectiveness of smoking cessation *** are the implications for public health practice?The mHealth-based comprehensive smoking cessation modalities,with or without mailing cessation medications,present a promising approach to enhancing access to and utilization of smoking cessation *** strategy addresses the significant challenge of limited smoking cessation resources in China.

关键词： smoke Health thereby