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An exploration of meteorological effects on PM_(2.5) air quality in several provinces and cities in Vietnam

Journal of Environmental Sciences 2024年第11期145卷 139-151页

作者： Giang Tran Huong Nguyen Luan Thien La Huy Hoang-Cong Anh Hoang Le Faculty of Chemistry and Environment Dalat UniversityLam Dong ProvinceVietnam Environmental Protection Agency Lam Dong Province Department of Natural Resources and EnvironmentLam Dong ProvinceVietnam Northern Center for Environmental Monitoring Environmental Pollution Control DepartmentHa Noi CityVietnam Faculty of Environment University of ScienceHo Chi Minh CityVietnam Vietnam National University Ho Chi Minh CityVietnam

Linking meteorology and air pollutants is a key *** study investigated meteorological effects on PM_(2.5)concentration using the advanced convergent cross mapping method,utilizing hourly PM_(2.5)concentration and six meteorological factors across eight provinces and cities in *** demonstrated that temperature(ρ=0.30)and radiation(ρ=0.30)produced the highest effects,followed by humidity(ρ=0.28)and wind speed(ρ=0.24),while pressure(ρ=0.22)and wind direction(ρ=0.17)produced the weakest effects on PM_(2.5)*** theρvalues showed that temperature,wind speed,and wind direction had greater impacts on PM_(2.5)concentration during the dry season whereas radiation had a more influence during the wet season;Southern stations experienced larger meteorological ***,humidity,pressure,and wind direction had both positive and negative influences on PM_(2.5)concentration,while radiation and wind speed mostly had negative *** PM_(2.5)pollution episodes,there wasmore contribution ofmeteorological effects on PM_(2.5)concentration indicated byρ*** contaminated levels,humidity(ρ=0.45)was the most dominant factor affecting PM_(2.5)concentration,followed by temperature(ρ=0.41)and radiation(ρ=0.40).Pollution episodes were pointed out to be more prevalent under higher humidity,higher pressure,lower temperature,lower radiation,and lower wind ***ρcalculation also revealed that lower temperature,lower radiation,and higher humidity greatly accelerated each other under pollution episodes,further enhancing PM_(2.5)*** findings contributed to the literature on meteorology and air pollution interaction.

关键词： Fine particulate matter Air pollution Meteorological effect Convergent cross mapping causality analysis Vietnam

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A novel structural modeling and analysis of VLSI interconnect with an RLC tree network system using a BG/SEBD approach

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Science China(Information Sciences) 2011年第9期54卷 1968-1985页

作者： CHANG RueyFong KAO WenShiow TSENG KuoHsiung HUANG ShihYing Department of Electrical Engineering National Taipei University of Technology Department of Environmental Resources Management Transworld Institute of Technology

A practical and effective novel graphical structural modeling and analysis approach is *** approach is used for solving the state interactions modeling problem caused by the model approximations in VLSI interconnect for RLC tree network *** bond graph (BG) energy model with a simulink energy-based block diagram (SEBD) algorithm is *** dynamic behaviors of an example of VLSI interconnect with a 20th-order RLC tree are *** of sequent structuring and the delineation of dynamic interactions can be provided for users applying the BG/SEBD algorithms in the development of structural *** is shown that the new BG/SEBD structural modeling approach requires neither mathematical higher-order reduction nor physically based model ***,useful information can be extracted from the BG/SEBD representation of physical RLC tree network *** time-domain and frequency-domain simulation results are applied to analyze the dynamic response of energy-storing elements using BG/SEBD algorithm combined with Matlab/Simulink ***,a causal analysis of the system zeros plot from the shortest causal path method is proposed,to predict the dynamic response of energy-storing elements and the system performance for design and verification *** dynamic response outputs from different node points were revealed,and the obtained physical information is significant which suggests feasible directions for design (re-design) improvement toward better overall system performance.

关键词： higher-order RLC tree interconnect network (RLC-TIN) bond graph (BG) structural modeling time-domain and frequency-domain analysis causality analysis

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