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Impacts of synoptic circulation on surface ozone pollution in a coastal eco-city in Southeastern China during 2014-2019

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Journal of Environmental sciences 2023年第5期127卷 143-157页

作者： Yu Yan Xuesong Wang Zhengchao Huang Kun Qu Wenbin Shi Zimu Peng Limin Zeng Shaodong Xie Yuanhang Zhang State Key Joint Laboratory of Environmental simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China international Joint Laboratory for Regional Pollution Control Ministry of EducationBeijing 100816China center for Environmental Education and Communications of Ministry of Ecology and Environment Beijing 100020China Beijing Innovation center for engineering Science and Advanced Technology Peking UniversityBeijing 100871China CAS center for Excellence in Regional Atmospheric Environment Chinese Academy of SciencesXiamen 361021China

The coastal eco-city of Fuzhou in Southeastern China has experienced severe ozone(O_(3))episodes at times in recent *** this study,three typical synoptic circulations types(CTs)that influenced more than 80%of O_(3) polluted days in Fuzhou during 2014-2019 were identified using a subjective *** characteristics of meteorological conditions linked to photochemical formation and transport of O_(3) under the three CTs were *** Air Quality Model with extensions was applied to simulate O_(3) episodes and to quantify O_(3) sources from different regions in *** Fuzhou was located to the west of a high-pressure system(classified as“East-ridge”),more warm southwesterly currents flowed to Fuzhou,and the effects of cross-regional transport from Guangdong province and high local production promoted the occurrence of O_(3) *** a uniform pressure field with a low-pressure system occurring to the east of Fuzhou(defined as“East-low”),stagnant weather conditions caused the strongest local production of O_(3) in the atmospheric boundary *** by high-pressure systems over the mainland(categorized as“Inland-high”),northerly airflows enhanced the contribution of cross-regional transport to O_(3) in *** abnormal increases of the“East-ridge”and“Inland-high”were closely related to O_(3) pollution in Fuzhou in April and May 2018,resulting in the annual maximum number of O_(3) polluted days during recent ***,the rising number of autumn O_(3) episodes in 2017-2019 was mainly related to the“Inland-high”,indicating the aggravation of cross-regional transport and highlighting the necessity of enhanced regional collaboration and efforts in combating O_(3) pollution.

关键词： Ozone pollution Synoptic circulation Regional transport Chemical production

Pumping and sliding of droplets steered by a hydrogel pattern for atmospheric water harvesting

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National Science Review 2023年第12期10卷 181-192页

作者： Wei Zhang Qinghua Ji Gong Zhang Zhenao Gu Haozhi Wang Chengzhi Hu Huijuan Liu Zhiyong Jason Ren Jiuhui Qu center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of Environment Tsinghua University Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences University of Chinese Academy of sciences Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education) School of Materials Science and EngineeringTianjin University Department of Civil and Environmental engineering and Andlinger center for Energy and the Environment Princeton University

Atmospheric water harvesting is an emerging strategy for decentralized and potable water supplies. However,water nucleation and microdroplet coalescence on condensing surfaces often result in surface flooding owing to the lack of a sufficient directional driving force for shedding. Herein, inspired by the fascinating properties of lizards and catfish, we present a condensing surface with engineered hydrogel patterns that enable rapid and sustainable water harvesting through the directional pumping and drag-reduced sliding of water droplets. The movement of microscale condensed droplets is synergistically driven by the surface energy gradient and difference in Laplace pressure induced by the arch hydrogel patterns. Meanwhile, the superhydrophilic hydrogel surface can strongly bond inner-layer water molecules to form a lubricant film that reduces drag and facilitates the sliding of droplets off the condensing surface. Thus, this strategy is promising for various water purification techniques based on liquid–vapor phase-change processes.

关键词： atmospheric water harvesting droplet manipulation bio-inspired condensation

Sensitivity Analysis of Electromagnetic Scattering from Dielectric Targets with Polynomial Chaos Expansion and Method of Moments

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Computer Modeling in engineering & sciences 2024年第8期140卷 2079-2102页

作者： Yujing Ma Zhongwang Wang Jieyuan Zhang Ruijin Huo Xiaohui Yuan College of Architecture and Civil engineering Xinyang Normal UniversityXinyang464000China Henan international Joint Laboratory of Structural Mechanics and Computational simulation College of Architecture and Civil EngineeringHuanghuai UniversityZhumadian463000China Academy of Military sciences Beijing100091China Henan New Environmentally-Friendly Civil engineering Materials engineering Research center Xinyang Normal UniversityXinyang464000China

In this paper,an adaptive polynomial chaos expansion method(PCE)based on the method of moments(MoM)is proposed to construct surrogate models for electromagnetic scattering and further sensitivity *** MoM is applied to accurately solve the electric field integral equation(EFIE)of electromagnetic scattering from homogeneous dielectric *** the bistatic radar cross section(RCS)as the research object,the adaptive PCE algorithm is devoted to selecting the appropriate order to construct the multivariate surrogate *** corresponding sensitivity results are given by the further derivative operation,which is compared with those of the finite difference method(FDM).Several examples are provided to demonstrate the effectiveness of the proposed algorithm for sensitivity analysis of electromagnetic scattering from homogeneous dielectric targets.

关键词： Adaptive polynomial chaos expansion method method of moments radar cross section electromagnetic scattering

Fuel efficient model predictive control strategies for a group of connected vehicles incorporating vertical vibration

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Science China(Technological sciences) 2017年第11期60卷 1732-1746页

作者： QIAN LiJun QIU LiHong CHEN Peng ABDOLLAHI Zoleikha PISU Pierluigi Department of Vehicle engineering Hefei University of Technology international center for Automotive Research Clemson University

This paper presents a decentralized fuel efficient model predictive control(MPC) strategy for a group of connected vehicles incorporating vertical vibration. To capture the vehicle vibration dynamics, the dynamics of the suspension system is integrated with the longitudinal dynamics of the vehicle. Furthermore, a MPC framework with finite time horizon is formulated to calculate the optimal velocity profile that compromises fuel economy, mobility and ride comfort for every individual vehicle with the safety and physical constraints considered. In the MPC framework, the target velocity is calculated using signal phase and timing(SPAT)information to reduce the number of stoppage at red lights, and the vertical acceleration is calculated parallel to the calculation of the fuel consumption. The MPC optimal problem is solved with fast-MPC approach which enhances the computational efficiency via exploiting the structure of the control system and approximate methods. simulation studies are conducted over different SPATs and connectivity penetration rates and the results validate the advantages of the proposed control architecture.

关键词： model predictive control connected vehicles fuel economy vertical vibration intelligent transportation system

Design and optimization of equivalent consumption minimization strategy for 4WD hybrid electric vehicles incorporating vehicle connectivity

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Science China(Technological sciences) 2018年第1期61卷 147-157页

作者： QIU LiHong QIAN LiJun ZOMORODI Hesam PISU Pierluigi Department of Vehicle engineering Hefei University of Technology international center for Automotive Research Clemson University

This paper presents an optimized equivalent consumption minimization strategy(ECMS) for four-wheel-drive(4 WD) hybrid electric vehicles(HEVs) incorporating vehicle connectivity. In order to be applicable to the 4 WD architecture, the ECMS is designed based on a rule-based strategy and used under the condition that a certain propulsion mode is activated. Assuming that a group of 4 WD HEVs are connected and position information can be shared with each other, we formulate a decentralized model predictive control(MPC) framework that compromises fuel efficiency, mobility, and inter-vehicle distance to optimize the velocity profile of each individual vehicle. Based on the optimized velocity profile, an optimization problem considering both fuel economy and battery state of charge(SOC) sustainability is formulated to optimize the equivalent factors(EFs) of the ECMS for HEVs over an appropriate time window. MATLAB User Datagram Protocol(UDP) is used in the codes run on multiple computers to simulate the wireless communication among vehicles, which share position information via UDP-based communication, and dSPACE is used as a software-in-the-loop platform for the simulation of the optimized ECMS. simulation results validate the control effectiveness of the proposed method.

关键词： equivalent consumption minimization strategy(ECMS) hybrid electric vehicles(HEVs) model predictive control(MPC) connected vehicles signal phase and timing(SPAT) optimization

Monte Carlo forecasting of time series data using Polynomial-Fourier series model

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international Journal of Modeling, simulation, and Scientific Computing 2021年第3期12卷 112-124页

作者： Salim Jibrin Danbatta Asaf Varol software engineering Department Firat University Elazig CenterElazigTurkey Computer engineering Department Maltepe University College of Engineering and Natural Sciences Maltepe University34857 Maltepe/IstanbulTurkey

The perishable nature of tourism products and services makes forecasting an important tool for tourism planning,especially in the current COVID-19 pandemic *** forecast assists tourism organizations in decision-making regarding resource allocations to avoid *** study is motivated by the need to model periodic time series with linear and nonlinear trends.A hybrid Polynomial-Fourier series model that uses the combination of polynomial and Fourier fittings to capture and forecast time series data was *** proposed model is applied to monthly foreign visitors to Turkey from January 2014 to August 2020 dataset and diagnostic checks show that the proposed model produces a statistically good *** improve the model forecast,a Monte Carlo simulation scheme with 100 simulation paths is applied to the model *** mean of the 100 simulation paths within±2σbounds from the model curve was taken and found to give statistically acceptable results.

关键词： Time series forecasting Monte Carlo Fourier series polynomial COVID-19.

Implementation of LDA+ Gutzwiller with Newton's method

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Chinese Physics B 2017年第1期26卷 391-398页

作者： Jian Zhang Ming-Feng Tian Guang-Xi Jin Yuan-Feng Xu Xi Dai Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China LCP Institute of Applied Physics and Computational Mathematics Beijing 100088 China CAEP software center for High Performance Numerical simulation Beijing 100088 China Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang 621900 China

In order to calculate the electronic structure of correlated materials, we propose implementation of the LDA＋Gutzwiller method with Newton＇s method. The self-consistence process, efficiency and convergence of calculation are improved dramatically by using Newton＇s method with golden section search and other improvement *** compare the calculated results by applying the previous linear mix method and Newton＇s method. We have applied our code to study the electronic structure of several typical strong correlated materials, including SrVO3, LaCoO3, and La2O3Fe2Se2. Our results fit quite well with the previous studies.

关键词： LDA+Gutzwiller strongly correlated electrons Newton's method

Architecture of Co-layered double hydroxide nanocages/graphene composite electrode with high electrochemical performance for supercapacitor

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Journal of Energy Chemistry 2018年第2期27卷 507-512页

作者： Xianyu Chu Ting Deng Wei Zhang Dong Wang Xiaofei Liu Cai Zhang Tingting Qin Liyun Zhang Bingsen Zhang Chengmeng Chen Weitao Zheng State Key Laboratory of Automotive simulation and Control and Department of Materials Science and International Center of Future Science and Electron Microscopy Center Jilin University Changchun 130012 Jilin China Institute of Metal Research Chinese Academy of sciences Shenyang 110016 Liaoning China CAS Key Laboratory of Carbon Materials Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030001 Shanxi China

A facile hydrolysis method was applied to fabricate high-performance Co-layered double hydroxide（LDH）nanocages/graphene composites for supercapacitors. The materials exhibit enhanced rate capability than the counterpart electrode free of graphene while maintaining a high specific capacitance. In addition,such Co-LDH nanocages/graphene composites display an excellent cycling stability; the capacitance retention of Co-LDH nanocages/graphene composite electrode remains 90.4% after 10000 cycles at a current density of 2 A g（-1）. The integration of high capacity of double hydroxide and outstanding conductivity of graphene makes the delicately-designed composites promising candidates for electrode materials for supercapacitors.

关键词： Co-LDH nanocages Graphene Hydrolysis Rate capability Supercapacitor

A Novel Method for Solving Time-Dependent 2D Advection-Diffusion-Reaction Equations to Model Transfer in Nonlinear Anisotropic Media

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Communications in Computational Physics 2019年第6期26卷 233-264页

作者： Ji Lin Sergiy Reutskiy C.S.Chen Jun Lu State Key Laboratory of Hydrology-Water Resources and Hydraulic engineering International Center for Simulation Software in Engineering and SciencesCollege of Mechanics and MaterialsHohai UniversityNanjing 211100China State Institution"Institute of Technical Problems of Magnetism of the National Academy of sciences of Ukraine" Industrialnaya St.1961106KharkovUkraine Department of Mathematics University of Southern MississippiHattiesburgMS 39406USA Nanjing Hydraulic Research Institute Nanjing 210029China State Key Laboratory of Hydrology Water Resources and Hydraulic engineering Nanjing 210098China

This paper presents a new numerical technique for solving initial and bound-ary value problems with unsteady strongly nonlinear advection diffusion reaction(ADR)*** method is based on the use of the radial basis functions(RBF)for the approximation space of the *** Crank-Nicolson scheme is used for approximation in *** results in a sequence of stationary nonlinear ADR *** equations are solved sequentially at each time step using the proposed semi-analytical technique based on the *** approximate solution is sought in the form of the analytical expansion over basis functions and contains free *** basis functions are constructed in such a way that the expansion satisfies the boundary conditions of the problem for any choice of the free *** free parameters are determined by substitution of the expansion in the equation and collocation in the solution *** the case of a nonlinear equation,we use the well-known procedure of *** transforms the original equation into a sequence of the linear ones on each time *** numerical examples confirm the high accuracy and robustness of the proposed numerical scheme.

关键词： Advection diffusion reaction time-dependent fully nonlinear anisotropic media Crank-Nicolson scheme meshless method