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CO_(2)and Cost-Based Optimum Design of Sustainable Metakaolin-Modified Concrete

Journal of Renewable Materials 2022年第9期10卷 2431-2450页

作者： Xiaoyong Wang Department of Architectural Engineering Department of Integrated Energy and Infra SystemKangwon National UniversityChuncheon-si24341Korea

Metakaolin is a highly reactive pozzolanic material that is widely utilized for enhancing the performance of concrete.This study offers a framework for the mixture design of sustainable metakaolin-modified concrete with low CO_(2)emissions and low costs.Different design strengths after 28 days are first formulated,with values such as 30,40,50,and 60 MPa.A genetic algorithm is then used to determine the optimal mixtures.Minimized CO_(2)and cost are set as the aims of the genetic algorithm.The strength of the concrete,its workability(slump),and carbonation service life with climate change are set as constraints of the genetic algorithm.Five design cases are considered:1)low-CO_(2)concrete with no carbonation,2)low-CO_(2)concrete with carbonation,3)low-material cost concrete with carbonation,4)low-total cost concrete with carbonation,and 5)low-total cost concrete with climate change.Based on the analysis,the following results are found:1)When the design’s strength is 30 MPa,to satisfy the requirement of carbonation durability,the concrete real strength should exceed 30 MPa.Moreover,after considering climate change,the concrete real strength should be further improved.2)When the design strength is 40,50,or 60 MPa for low-total-cost concrete,climate change has no impact on the optimal design because the concrete has sufficient carbonation resistance.3)Low-material-cost concrete has the same mixture as low-total-cost concrete because compared with the material cost,the CO_(2)emission cost is much lower.Moreover,for low-material-cost or low-total-cost concrete,the metakaolin content is at the lower limit because the price of metakaolin is much higher than that of cement.Summarily,the proposed model covered different aspects of sustainable concrete,such as cost and CO_(2)emissions,clarified various decisive factors of mix design,such as strength and carbon durability,and considered different conditions of climate change,such as no climate change and Representative Concentration Pathways(RCP)8.5.The proposed method is val

关键词： Metakaolin CO_(2) cost optimal design carbonation climate change

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Two-Dimensional Reconstruction of Heat Transfer in a Flat Flame Furnace through Computer-Based Tomography and Tunable-Diode-Laser Absorption Spectroscopy

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Fluid Dynamics & Materials Processing 2020年第5期16卷 857-869页

作者： Xiaoyong Wang Huainan Union University Huainan232038China

To explore the inherent characteristics of combustion-induced heat transfer in a flat flame furnace,a sophisticated hybrid method is introduced by combining a computer-based tomography(CT)-algebraic iterative algorithm and Tunable Diode Laser Absorption Spectroscopy(TDLAS).This technique is used to analyze the distribution of vapor concentration and furnace temperature.It is shown that by using this strategy a variety of details can be obtained,which would otherwise be out of reach.

关键词： Computed tomography algorithm flame furnace TDLAS temperature boundary

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Broadband design of acoustic metasurfaces for the stabilization of a Mach 4 boundary layer flow

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Advances in Aerodynamics 2022年第1期4卷 286-303页

作者： Rui Zhao Xiao Liu Chihyung Wen Xiaoyong Wang School of Aerospace Engineering Beijing Institute of TechnologyBeijing100081China Department of Aeronautical and Aviation Engineering The Hong Kong Polytechnic UniversityHong KongChina State Key Laboratory of High Temperature Gas Dynamics Institute of MechanicsChinese Academy of Sciences100190BeijingChina

A piecewise acoustic metasurface is designed to suppress the first mode while marginally amplifying the Mack second mode in a Mach 4 flat-plate boundary layer(BL)flow.The results of linear stability theory(LST)and the eN method demonstrate the stabilization effect and transition delay performance,respectively.However,the direct numerical simulation(DNS)results indicate that the designed broadband acoustic metasurface actually weakly excites the first mode with a slightly larger fluctuating pressure amplitude at the surface,which is in contrast to the analysis of LST.The discrepancies are found to lie in the‘roughness’effect caused by the recirculation zones inside the microslits and the alternating expansion and compression waves induced at the slit edges,which significantly amplifies the first mode.For further clarification of the competitive mechanism between the acoustic stabilization and‘roughness’destabilization effects of metasurfaces on the first mode,a carefully designed metasurface is installed at the maximum growth rate region,which excites the first mode on the metasurface but inhibits its development downstream.

关键词： Boundary layer stabilization Acoustic metasurfaces Mack modes High-speed flow

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A Hierarchical LSTM-Based Vehicle Trajectory Prediction Method Considering Interaction Information

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Automotive Innovation 2024年第1期7卷 71-81页

作者： Haitao Min xiaoyong Xiong Pengyu wang Zhaopu Zhang State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130012China

Trajectory prediction is an essential component in autonomous driving systems,as it can forecast the future movements of surrounding vehicles,thereby enhancing the decision-making and planning capabilities of autonomous driving systems.Traditional models relying on constant acceleration and constant velocity often experience a reduction in prediction accu-racy as the forecasted timeframe extends.This limitation makes it challenging to meet the demands for medium to long-term trajectory prediction.Conversely,data-driven models,particularly those based on Long Short-Term Memory(LSTM)neural networks,have demonstrated superior performance in medium to long-term trajectory prediction.Therefore,this study introduces a hierarchical LSTM-based method for vehicle trajectory prediction.Considering the difficulty of using a single LSTM model to predict trajectories for all driving intentions,the trajectory prediction task is decomposed into three sequential steps:driving intention prediction,lane change time prediction,and trajectory prediction.Furthermore,given that the driving intent and trajectory of a vehicle are always subject to the influence of the surrounding traffic flow,the predictive model proposed in this paper incorporates the interactional information of neighboring vehicle movements into the model input.The proposed method is trained and validated on the real vehicle trajectory dataset Next Generation Simulation.The results show that the proposed hierarchical LSTM method has a lower prediction error compared to the integral LSTM model.

关键词： Autonomous vehicles Trajectory prediction Long Short-Term Memory Driving intention prediction

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A scheme for realizing nonreciprocal interlayer coupling in bilayer topological systems

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Frontiers of Optoelectronics 2023年第4期16卷 71-80页

作者： Xiaoxiao wang Ruizhe Gu Yandong Li Huixin Qi xiaoyong Hu Xingyuan wang Qihuang Gong State Key Laboratory for Mesoscopic Physics and Department of Physics Collaborative Innovation Center of Quantum Matter&Frontiers Science Center for Nano-OptoelectronicsBeijing Academy of Quantum Information SciencesPeking UniversityBeijing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Hefei National Laboratory Hefei 230088China College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China

Nonreciprocal interlayer coupling is difcult to practically implement in bilayer non-Hermitian topological photonic systems.In this work,we identify a similarity transformation between the Hamiltonians of systems with nonreciprocal interlayer coupling and on-site gain/loss.The similarity transformation is widely applicable,and we show its application in one-and two-dimensional bilayer topological systems as examples.The bilayer non-Hermitian system with nonreciprocal interlayer coupling,whose topological number can be defned using the gauge-smoothed Wilson loop,is topologically equivalent to the bilayer system with on-site gain/loss.We also show that the topological number of bilayer non-Hermitian C6v-typed domaininduced topological interface states can be defned in the same way as in the case of the bilayer non-Hermitian Su–Schrieffer–Heeger model.Our results show the relations between two microscopic provenances of the non-Hermiticity and provide a universal and convenient scheme for constructing and studying nonreciprocal interlayer coupling in bilayer non-Hermitian topological systems.This scheme is useful for observation of non-Hermitian skin efect in three-dimensional systems.

关键词： Nonreciprocal Bilayer Interlayer coupling Topological photonics

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Investigation of the seismic behavior of grouted sandy gravel foundations using shaking table tests

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Frontiers of Structural and Civil Engineering 2022年第9期16卷 1196-1211页

作者： Tiancheng wang Yu LIANG xiaoyong ZHANG Zhihuan RUAN Guoxiong MEI Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education College of Civil Engineering and ArchitectureGuangxi UniversityNanning 530004China Ocean College Zhejiang UniversityZhoushan 316021China

Sandy gravel foundations exhibit non-linear dynamic behavior when subjected to strong ground motions,which can have amplification effects on superstructures and can reveal insufficient lateral resistance of foundations.Grouting methods can be used to improve the seismic performance of natural sandy gravel foundations.The strength and stiffness of grouted sandy gravel foundations are different from those of natural foundations,which have unknown earthquake resistance.Few studies have investigated the seismic behavior of sandy gravel foundations before and after grouting.In this study,two shaking table tests were performed to evaluate the effect of grouting reinforcement on seismic performance.The natural frequency,acceleration amplification effect,lateral displacement,and vertical settlement of the non-grouted and grouted sandy gravel foundations were measured and compared.Additionally,the dynamic stress-strain relationships of the two foundations were obtained by a linear inversion method to evaluate the seismic energy dissipation.The test results indicated that the acceleration amplification,lateral displacement amplitude,and vertical settlement of the grouted sandy gravel foundation were lower than that of the non-grouted foundation under low-intensity earthquakes.However,a contrasting result was observed under high-intensity earthquakes.This demonstrated that different grouting reinforcement strategies are required for different sandy gravel foundations.In addition,the dynamic stress-strain relationship of the two foundations exhibited two different energy dissipation mechanisms.The results provide insights relating to the development of foundations for relevant engineering sites and to the dynamic behavior of grouted foundations prior to investigating soil-structure interaction problems.

关键词： sandy gravel foundation grouting-treated reinforcement shaking table test seismic behavior

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The Forced Secondary Circulation of the Mei-yu Front

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Advances in Atmospheric Sciences 2020年第7期37卷 766-780页

作者： Zipeng YUAN xiaoyong ZHUGE Yuan wang School of Atmospheric Sciences and Key Laboratory of Mesoscale Severe Weather of Ministry of EducationNanjing UniversityNanjing 210023China Liaoning Provincial Meteorological Information Center Shenyang 110160China

Using National Centers for Environmental Prediction reanalysis data for the period 28 June to 12 July during 2001 to2013,the secondary circulation(SC)associated with the mei-yu front was quantitatively diagnosed by numerically solving a primitive version of the Sawyer-Eliassen equation.Results demonstrate that a direct SC exists near the mei-yu front zone during mid-summer and the synoptic-scale geostrophic deformations are the main factors determining SC structures.About94%of the sinking strength and 61%of the ascending strength in the SC are induced by the geostrophic deformations.Other terms,such as diabatic heating,ageostrophic dynamical forcing,and frictional forcing,mainly influence the fine flow pattern of the SC.The forced SC produces a frontogenesis area tilting to the north with altitude.Further diagnosis clarifies the positive feedback involving the geostrophic shear forcing and vorticity frontogenesis in the upper-level mei-yu front zone.Furthermore,statistical results indicate that all 34 deep convection cases that occurred in the warm region of the meiyu front over the period 2004-2013 experienced high-level frontogenesis associated with along-jet cold advection.The cyclonic shear forcing"moved"the monsoon SC’s subsidence branch to the warm side of the mei-yu front and caused the subsidence branch to extend downwards to the lower troposphere,conducive to the initiation of deep convection in the warm region of the mei-yu front.

关键词： forcing subsidence altitude

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Synthesis of poly(silyl ether)s via copper-catalyzed dehydrocoupling polymerization

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Chinese Chemical Letters 2022年第5期33卷 2639-2642页

作者： Xiaoqing wang Yuqing Bai xiaoyong Zhai Bo Wu Yonggui Zhou Department of Fine Chemicals State Key Laboratory of CatalysisDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China

The development of efficient method to prepare poly(silyl ether)s(PSEs)is highly desirable.Herein,an environmentally sustainable copper-catalyzed dehydrocoupling polymerization was developed with good yields and high molecular weight(up to 48,400 of Mn and up to 97%yield).Monomers of different types(AB type or AA and BB type)are suitable to afford PSEs.The PSEs show good thermal stability and low glass-transition temperature.

关键词： Poly(silyl ether)s CuH catalysis Dehydrocoupling Environmental and economic benign Good thermal stability

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Objective Identification and Climatic Characteristics of Heavy-Precipitation Northeastern China Cold Vortexes

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Advances in Atmospheric Sciences 2023年第2期40卷 305-316,I0009,I0010页

作者： Xu CHEN xiaoyong ZHUGE Xidi ZHANG Yuan wang Daokai XUE Key Laboratory of Mesoscale Severe Weather of Ministry of Education and School of Atmospheric SciencesNanjing UniversityNanjing 210023China Key Laboratory of Transportation Meteorology of China Meteorological Administration Nanjing Joint Institute for Atmospheric SciencesNanjing 210041China National Meteorological Center Beijing 100081China

The northeastern China cold vortex(NCCV)plays an important role in regional rainstorms over East Asia.Using the National Centers for Environmental Prediction Final reanalysis dataset and the Global Precipitation Measurement product,an objective algorithm for identifying heavy-precipitation NCCV(HPCV)events was designed,and the climatological features of 164 HPCV events from 2001 to 2019 were investigated.The number of HPCV events showed an upward linear trend,with the highest frequency of occurrence in summer.The most active region of HPCV samples was the Northeast China Plain between 40°–55°N.Most HPCV events lasted 3–5 days and had radii ranging from 250 to 1000 km.The duration of HPCV events with larger sizes was longer.About half of the HPCV events moved into(moved out of)the definition region(35°–60°N,115°–145°E),and half initiated(dissipated)within the region.The initial position was close to the western boundary of the definition region,and the final position was mainly near the eastern boundary.The locations associated with the precipitation were mostly concentrated within 2000 km southeast of the HPCV systems,and they were farther from the center in the cold season than in the warm season.

关键词： northeastern China cold vortex heavy precipitation objective identification climatological features

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Sb_(2)WO_(6)/BiOBr 2D nanocomposite S-scheme photocatalyst for NO removal

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Journal of Materials Science & Technology 2020年第21期56卷 236-243页

作者： Yanyu wang Kai wang Jinlong wang xiaoyong Wu Gaoke Zhang Hubei Key Laboratory of Mineral Resources Processing and Environment State Key Laboratory of Silicate Materials for ArchitecturesWuhan University of TechnologyWuhan430070China

Photocatalysis technology is an efficient method for removing nitrogen oxides at low concentrations.Herein,dimension-matched Sb_(2)WO_(6)/BiOBr photocatalysts were synthesized at room temperature via precipitation-deposition way.Under visible light irradiation,the as-obtained Sb_(2)WO_(6)/Bi OBr photocatalysts showed enhanced photocatalytic performance compare with the pure Sb_(2)WO_(6) and BiOBr for removal of NO.The optimal ratio for photocatalytic performance of Sb_(2)WO_(6)/BiOBr composite was found to be 30 wt.%of Sb_(2)WO_(6),which showed excellent recycling property even after 5 runs.Moreover,in situ DRIFT was carried out to reveal the time-dependent evolution of reaction intermediates during photocatalytic NO oxidation.The probable photocatalytic mechanism was considered based on the active species capture experiments.The enhanced photocatalytic performance for the Sb_(2)WO_(6)/BiOBr composite photocatalyst perhaps is attributed to the interaction between BiOBr and Sb2WO6 and S-scheme charge transfer path.

关键词： Sb_(2)WO_(6) BiOBr Photocatalytic NO removal S-scheme

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