检索结果-内蒙古大学图书馆

Differentiated regional impacts of future meteorological changes and anthropogenic emission control on PM 2.5 concentrations in China

引用

Sustainable Horizons 2025年 16卷

作者： Yueqi Jiang Yisheng Sun Shengyue Li Dejia Yin Dian Ding Zhaoxin Dong Haotian Zheng Bin Zhao Shuxiao Wang State Key Laboratory of Regional Environment and Sustainability School of Environment Tsinghua University Beijing 100084 PR China Key Laboratory of Sources and Control of Air Pollution Complex Ministry of Ecology and Environment Beijing 100084 PR China Department of Meteorology and Atmospheric Science The Pennsylvania State University University Park PA 16802 USA Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control College of Environment and Energy South China University of Technology Guangzhou Higher Education Mega Center Guangzhou 510006 PR China Nanjing-Helsinki Institute in Atmospheric and Earth System Sciences Nanjing University Nanjing 210023 PR China

Despite great progress in past decades, mitigating ambient fine particulate matter (PM 2.5 ) pollution remains a long-term task for China in protecting human health. Effective strategies must account for the impacts of future meteorological changes and anthropogenic emission variations, which vary substantially across regions and climate change scenarios. In this study, we assessed meteorological conditions, anthropogenic emissions, and PM 2.5 concentrations in 2060 in key regions in mainland China under various climate change scenarios by coupling an integrated assessment model and a regional meteorology/air quality dynamic downscaling simulation system. The results show that surface temperature and humidity are projected to increase across mainland China under all scenarios (SSP126, SSP245, SSP370, SSP585), while other meteorological factors vary by region and scenario. In the Jing-Jin-Ji and Fenwei Plain, meteorological changes are expected to worsen air pollution, leading to PM 2.5 increases of over 3.5 and 1.5 μg/m³, respectively. Conversely, meteorological changes are likely to reduce PM 2.5 in the Yangtze River Delta, Pearl River Delta, and Sichuan Basin in most scenarios. The analysis of anthropogenic emission variations demonstrates that large anthropogenic emissions reductions will significantly decrease PM 2.5 concentrations in all key regions, but the extent of reductions varies due to regional differences in emission sources. Among key regions, the Pearl River Delta usually exhibits the smallest proportional reductions in emissions and the least decline in PM 2.5 concentration across various scenarios. The differentiated regional impact of meteorological changes and anthropogenic emission control on future PM 2.5 concentrations in China highlights the necessity of region-specific policies to mitigate future PM 2.5 pollution.

关键词： Regional air quality Climate change PM 2.5 China

来源：评论

学校读者我要写书评

暂无评论

A General Framework for Chinese Domain Knowledge Graph Question Answering Based on TransE

引用

Journal of Physics: Conference Series 2020年第1期1693卷

作者： Zhongmin Pei Jie Zhang Wei Xiong Li Li Zhangkai Luo Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering University Beijing China Gaojing Network Management and Security Center Beijing China

This paper introduces a general question answering (QA) framework for Chinese domain knowledge graphs to serve various industries. The question is analyzed by shielding invalid characters in this framework, and the TransE calculation of entities and relations is used to search answer, rather than traditional logical queries that rely heavily on predefined rules. In this way, the QA framework can be easily applied to different fields with little manual participation, and reduce the migration cost caused by the lack of scalability of the existing QA systems, which are designed only for specific domains. Then, the proposed framework is operated on the space launch knowledge graph and has achieved HITS@1, HITS@3, HITS@5 scores of 60.60%, 80.87%, 85.61% separately, which is competitive with other restricted domain knowledge graphs. In addition, numerical results on the knowledge graph of the Three Kingdoms and the COVID-19-Character verified the scalability of the QA framework.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Singular Perturbation Approach based Boundary Control of a Flexible Manipulator with High Gain Observer

Singular Perturbation Approach based Boundary Control of a F...

引用

第三十八届中国控制会议

作者： Zhijie Liu Hongjun Yang Yan Yang School of Automation and Electrical Engineering University of Science and Technology Beijing The State Key Laboratory of Management and Control for Complex System Institute of Automation Chinese Academy of Sciences School of Electro-Mechanical Engineering Xidian University

In this study, boundary control of a flexible manipulator is developed on the basis of the dynamic, partial differential equation(PDE) model. One of the main contributions is that the high gain observer is first applied to the PDE model of a flexible manipulator instead of measuring link velocity and end actuator velocity. In addition, using singular perturbation approach the PDE model is divided into two simpler subsystems to simplify the control design. Based on the proposed observer and decoupled PDE model, a sliding mode boundary control is designed to regulate angular position and suppress elastic vibration simultaneously. Numerical simulations demonstrate the effectiveness of the proposed scheme.

关键词： Boundary control flexible manipulator PDE model high gain observer singular perturbation

来源：评论

学校读者我要写书评

暂无评论

Cooperative Collision Avoidance Method for Multi-UAV Based on Kalman Filter and Model Predictive Control

Cooperative Collision Avoidance Method for Multi-UAV Based o...

引用

International Conference on Unmanned systems and Artificial Intelligence

作者： Hanqiao Huang Huan Zhou Meiyun Zheng Cheng Xu Xiaofeng Zhang Wei Xiong Unmanned System Research Institute Northwest Polytechnical University Xi'an China Aeronautical Engineering College Air Force Engineering University Xi'an China School of Marine Science and Technology Northwest Polytechnical University Xi'an China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China UAV Researc Center Army Aviation Institute Beijing China

ISBN: (数字)9781728158594

ISBN: (纸本)9781728158600

Collision avoidance is the primary problem to be solved in formation flight of multiple Unmanned aerial vehicles(UAVs). Firstly, a cooperative collision avoidance architecture of multiple UAVs is designed according to the requirement of autonomous collision avoidance of single UAV. Then a new cooperative collision avoidance method of multiple UAVs based on Kalman filter and model predictive control(MPC) is proposed. In this method, extended Kalman filter(EKF) is used to estimate the state of obstacles and target points in uncertain environment space, and to predict the trajectory of obstacles and target points. At the same time, relevant performance index functions and constraints are set up. On the basis of sharing environmental information, model predictive control strategy is used to guide and make cooperative collision avoidance decisions for multiple UAVs. The simulation results show that the proposed method is effective in uncertain environment perception and UAV collision avoidance, and the cooperative mechanism has obvious advantages.

关键词： UAV cooperative decision collision avoidance Kalman filter state estimation MPC Collision avoidance Kalman filters Unmanned Aerial Vehicle State estimation Maximum Allowable Concentration drone honey bees environmental perception Formation flight

来源：评论

学校读者我要写书评

暂无评论

Refined recognition and intelligent smart interference of radar signal

Refined recognition and intelligent smart interference of ra...

引用

IEEE International Conference on Unmanned systems (ICUS)

作者： Jianquan Yuan Yunong Bu Shuyuan Yang Qingxi Chi Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing Electro-Mechanical Engineering Institute Beijing China Beijing Electro-Mechanical Engineering Institute Beijing China Xidian University Xi’an China

ISBN: (纸本)9781728137933

Facing the complex electromagnetic environment on the battlefield, how to effectively identify important radar signals by jammers and how to implement strong and effective electromagnetic interference to the enemy's huge radar detection system under the condition of limited jamming resources will be the difficult problems that need to be solved continuously in the electronic warfare field. The solution of these problems will be the premise of effective interference for wartime jammers. In this paper, the technical gap of traditional jammers is analyzed. For radar signal perception, a refined perception and recognition method is proposed, forming the algorithm idea of multi-scale feature extraction and recognition based on radar fingerprint and multi-channel integrated multi-label recognition and classification based on radar radiation source. For interference implementation, the idea of smart interference based on deep GAN is put forward, laying the ground for further research on cognitive electronic warfare.

关键词： Cognitive electronic warfare Smart interference Wartime application RADAR SIGNALS jammers Recognition (Psychology) Electromagnetic environments Electromagnetic fields electronic warfare PROBLEM SOLUTION PREMISES interference interference Battlefields

来源：评论

学校读者我要写书评

暂无评论

Hybrid algorithm for two-objective software defect prediction problem

引用

International Journal of Innovative Computing and Applications 2017年第4期8卷 207-212页

作者： Rong, Xiaotao Cui, Zhihua Complex System and Computational Intelligence Laboratory Taiyuan University of Science and Technology Shanxi030024 China

Static software defect prediction problem is one crucial problem in software test, to measure the performance, several indexes are introduced. In this paper, a two-objective software defect prediction model is employed, while probability of false alarm rate and probability of detection are taken as two objectives. To solve this model, one hybrid algorithm combined with support vector machine (SVM) and cuckoo search algorithm is designed. SVM is one general tool for this problem, and the performance is significantly influenced by two parameters. To provide a good classification results, one multi-objective cuckoo search algorithm is designed to optimise these two parameters. In this algorithm, the global best position is extended to be one collection including all non-dominated solutions, and the local search manner is changed to increase the local search speed. Simulation results show our hybrid algorithm is effective. Copyright © 2017 Inderscience Enterprises Ltd.

关键词： Support vector machines

来源：评论

学校读者我要写书评

暂无评论

Sources of atmospheric glyoxal and methylglyoxal in Beijing and its impact on wintertime secondary organic aerosol formation

Sources of atmospheric glyoxal and methylglyoxal in Beijing ...

引用

第二十四届大气污染防治技术研讨会

作者： Xionghui Qiu Shuxiao Wang Qi Ying Lei Duan Jia Xing Jingyuan Cao Di Wu Xiaoxiao Li Chengzhi Xing Xiao Yan Cheng Liu Jiming Hao MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and Engineering North China Electric Power University State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Zachry Department of Civil Engineering Texas A&M University College Station School of Earth and Space Sciences University of Science and Technology of China National Engineering Research Center of Urban Environmental Pollution Control Beijing Municipal Research Institute of Environmental Protection Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China

Atmospheric glyoxal(GLY) and methylglyoxal(MGLY) are key precursors of secondary organic aerosol(SOA). However, anthropogenic emissions of GLY and MGLY and their contribution to surface GLY and MGLY concentrations, as well as the secondary organic aerosol(SOA) formation, are not well quantified. By developing an emission inventory of anthropogenic GLY and MGLY and improving Community Multiscale Air Quality Model(CMAQ) with SOA formation from irreversible surface uptake of GLY and MGLY, as well as a precursor-origin resolved technique, we quantified the source contributions of GLY and MGLY and their impact on wintertime SOA formation in Beijing, China. The total emissions of GLY and MGLY in Beijing in 2017 are 1.1×10～4 kmol and 7.0×10～3 kmol, respectively. Anthropogenic primary emissions are found to be the dominant contributor to GLY and MGLY concentrations(～74% for GLY and ～63% for MGLY). Anthropogenic primary emissions of GLY and MGLY contributes to 30% of GLY/MGLY SOA daily average concentration and accounts for up to 45% of nighttime GLY/MGLY SOA. The study suggests that the anthropogenic GLY and MGLY emissions, mainly from gasoline vehicles and cooking, are important for SOA formation and shall be strictly controlled in Chinese megacities.

关键词： SOA Sources of atmospheric glyoxal and methylglyoxal in Beijing and its impact on wintertime secondary organic aerosol formation

来源：评论

学校读者我要写书评

暂无评论

Publisher's Note: “Coupling analysis of transient aerodynamic and dynamic response of articulated heavy vehicles under crosswinds” [Phys. Fluids 34, 017106 (2022)]

引用

Physics of Fluids 2022年第2期34卷

作者： Qianwen Zhang (张倩文) Chuqi Su (苏楚奇) Makoto Tsubokura (坪倉誠) Zhen Hu (胡振) Yiping Wang (汪怡平) 1Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Wuhan 430070 China 2Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan University of Technology Wuhan 430070 China 3Hubei Research Center for New Energy and Intelligent Connected Vehicle Wuhan University of Technology Wuhan 430070 China 4Graduate School of System Informatics Kobe University Kobe Hyogo 657-8501 Japan 5Complex Phenomena Unified Simulation Research Team RIKEN Advanced Institute for Computational Science Kobe Hyogo 650-0047 Japan 6Shanghai Huawei Technology Co. Shanghai 201206 China

This article was originally published online on 7 January 2022 with an incorrect page number. The correct page number is 017106. All online versions of this art

关键词：

来源：评论

学校读者我要写书评

暂无评论

Fast reaction of AlNPs promoted by oxide shell

Fast reaction of AlNPs promoted by oxide shell

引用

中国力学大会（CCTAM 2019）

作者： Bao Wu FengChao Wu YinBo Zhu AnMin He Pei Wang HengAn Wu CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics CAS Center for Excellence in Complex System Mechanics University of Science and Technology of China Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics

Combustion of Aluminum nanoparticles(AlNPs) has long been investigated experimentally because of its use in various energetic formulations for propellants and explosives. But the limited spatio-temporal resolution in experiments in particular makes it challenging to explore the microstructural evolution of AlNPs oxidation and associated mechanisms. Here we perform large-scale reactive molecular dynamics simulations to study the structural evolution of AlNPs with 2-4 nm thick oxide shell in oxygen environment. We find the temporal hollowing processes of AlNPs for both symmetrical and asymmetrical oxidations, in which the morphological evolution can be understood by discrepant electric field and temperature distributions for different system. In the early time, core Aluminum atoms experience a fast reaction with oxide shell. Environmental oxygen does not react with AlNPs until the surface O/Al ratio decreases to ～1.2. Moreover, based on our simulation results, previous experimental data agree well with the proposed model, which can well describe the relationship between combustion efficiency and oxide shell thickness, reveling that oxide shell promotes other than hinders combustion of AlNPs. The molecular insights obtained here would be significant for understanding the underlying mechanism and further modelling of AlNPs combustion

关键词： Fast reaction of AlNPs promoted by oxide shell

来源：评论

学校读者我要写书评

暂无评论

Optimization of Missile Path Planning Based on APMO-HV Algorithm

Optimization of Missile Path Planning Based on APMO-HV Algor...

引用

IEEE International Conference on Unmanned systems (ICUS)

作者： Hu Zhang Shuai Wang Tonglin Liu Aimin Zhou Yi Zhang Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing Electro-mechanical Engineering Institute Beijing China School of Mechanical Engineering Changzhou University Changzhou China Shanghai Key Laboratory of Multidimensional Information Processing School of Computer Science and Technology East China Normal University Shanghai China

In this paper, with considerations of low efficiency of missile path planning (MPP) by traditional aggregation technology, it uses affinity propagation based multi-objective evolutionary algorithm with hypervolume environment selection (APMO-HV) to solve the problem of MPP after establishing the MPP model. The experimental part compares and analyzes APMO-HV with six state-of-the-art algorithms, and applies it to address the MPP problem. The experimental results show that compared with the other six algorithms, APMO-HV has achieved the best solution performance in both the GLT test suite and MPP problem. This not only validates the effect of the proposed algorithm, but also enriches and improves the research results of MPP.

关键词： Missiles Optimization Path planning Turning Planning Target tracking Sociology

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：