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Distributed continuous-time aggregative optimization and its applications to power generation systems 认领 引用
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作者 XIAN Chengxin ZHAO Yu LIU Yongfang 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2026年第1期1-8,共8页
This paper investigates the distributed continuoustime aggregative optimization problem for second-order multiagent systems,where the local cost function is not only related to its own decision variables,but also to t... This paper investigates the distributed continuoustime aggregative optimization problem for second-order multiagent systems,where the local cost function is not only related to its own decision variables,but also to the aggregation of the decision variables of all the agents.By using the gradient descent method,the distributed average tracking(DAT)technique and the time-base generator(TBG)technique,a distributed continuous-time aggregative optimization algorithm is proposed.Subsequently,the optimality of the system's equilibrium point is analyzed,and the convergence of the closed-loop system is proved using the Lyapunov stability theory.Finally,the effectiveness of the proposed algorithm is validated through case studies on multirobot systems and power generation systems. 展开更多
关键词 distributed continuous-time aggregative optimization distributed average tracking(DAT) time-base generator(TBG)
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Distributed Event-Triggered Nash Equilibrium Seeking for Aggregative Game With Second-Order Dynamics 认领 引用 被引量：1
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作者 Yi Huang Jian Sun Qing Fei 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第7期1519-1521,共3页
Dear Editor,This letter studies the distributed Nash equilibrium seeking problem of aggregative game,in which the decision of each player obeys second-order dynamics and is constrained by nonidentical convex sets.To s... Dear Editor,This letter studies the distributed Nash equilibrium seeking problem of aggregative game,in which the decision of each player obeys second-order dynamics and is constrained by nonidentical convex sets.To seek the generalized Nash equilibrium(GNE),a projectionbased distributed algorithm via constant step-sizes is developed with linear convergence.In particular,a variable tracking technique is incorporated to estimate the aggregative function,and an event-triggered mechanism is designed to reduce the communication cost.Finally,a numerical example demonstrates the theoretical results. 展开更多
关键词 generalized nash equilibrium gne estimate aggregative functionand linear convergencein aggregative gamein distributed event triggered control reduce th distributed nash equilibrium seeking projectionbased distributed algorithm
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A Survey of Distributed Algorithms for Aggregative Games 认领 引用 被引量：1
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作者 Huaqing Li Jun Li +2 位作者 Liang Ran Lifeng Zheng Tingwen Huang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第5期859-871,共13页
Game theory-based models and design tools have gained substantial prominence for controlling and optimizing behavior within distributed engineering systems due to the inherent distribution of decisions among individua... Game theory-based models and design tools have gained substantial prominence for controlling and optimizing behavior within distributed engineering systems due to the inherent distribution of decisions among individuals.In non-cooperative settings,aggregative games serve as a mathematical framework model for the interdependent optimal decision-making problem among a group of non-cooperative players.In such scenarios,each player's decision is influenced by an aggregation of all players'decisions.Nash equilibrium(NE)seeking in aggregative games has emerged as a vibrant topic driven by applications that harness the aggregation property.This paper presents a comprehensive overview of the current research on aggregative games with a focus on communication topology.A systematic classification is conducted on distributed algorithm research based on communication topologies such as undirected networks,directed networks,and time-varying networks.Furthermore,it sorts out the challenges and compares the algorithms'convergence performance.It also delves into real-world applications of distributed optimization techniques grounded in aggregative games.Finally,it proposes several challenges that can guide future research directions. 展开更多
关键词 Aggregative game distributed algorithm Nash equilibrium(NE) networked control
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Distributed algorithms for aggregative games with multiple uncertain Euler–Lagrange systems over switching networks 认领 引用 被引量：1
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作者 Zhaocong Liu Jie Huang 《Journal of Automation and Intelligence》 CSCD 2025年第1期2-9,共8页
In this paper,we investigate the distributed Nash equilibrium(NE)seeking problem for aggregative games with multiple uncertain Euler–Lagrange(EL)systems over jointly connected and weight-balanced switching networks.T... In this paper,we investigate the distributed Nash equilibrium(NE)seeking problem for aggregative games with multiple uncertain Euler–Lagrange(EL)systems over jointly connected and weight-balanced switching networks.The designed distributed controller consists of two parts:a dynamic average consensus part that asymptotically reproduces the unknown NE,and an adaptive reference-tracking module responsible for steering EL systems’positions to track a desired trajectory.The generalized Barbalat’s Lemma is used to overcome the discontinuity of the closed-loop system caused by the switching networks.The proposed algorithm is illustrated by a sensor network deployment problem. 展开更多
关键词 Aggregative games Euler-Lagrange systems Jointly connected networks Adaptive control
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Theoretical research on aggregative dynamic pressure damper 认领 引用 被引量：2
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作者 胡军华 《Journal of Chongqing University》 2009年第3期188-194,共7页
To broaden the frequency width and increase the damping coefficient of a dynamic pressure damper, we designed an aggregative dynamic pressure damper (ADPD). Combined with the advantages of traditional dynamic pressure... To broaden the frequency width and increase the damping coefficient of a dynamic pressure damper, we designed an aggregative dynamic pressure damper (ADPD). Combined with the advantages of traditional dynamic pressure dampers (TDPD), ADPD can not only increase the damping coefficient in wide frequency range for valve control system, but also absorb partial pressure pulsations and impacts in the low and high frequency fields. Based on the theoretical research and the analysis compared with TDPD, we concluded that the ADPD was superior to the TDPD in the middle high frequency field, and the main parameters influencing the performance of the damper were the damping stiffness, orifice flow coefficient, pre-charge pressure, and the volume of the damper accumulator. 展开更多
关键词 aggregative dynamic pressure damper damping coefficient pressure pulsation
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Risk of group aggregative behavior during COVID-19 outbreak: A case report 认领 引用
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作者 Hui Zuo Zhi-Bing Hu Feng Zhu 《World Journal of Clinical Cases》 SCIE 2021年第1期170-174,共5页
BACKGROUND At the end of 2019,a new epidemic of viral pneumonia emerged in China and was determined to be caused by a novel coronavirus,which was named coronavirus disease 2019(COVID-19)by the World Health Organizatio... BACKGROUND At the end of 2019,a new epidemic of viral pneumonia emerged in China and was determined to be caused by a novel coronavirus,which was named coronavirus disease 2019(COVID-19)by the World Health Organization.The epidemic quickly spread,causing a worldwide pandemic.Scientists and clinicians across the globe have shifted their research efforts towards understanding the virus itself and its epidemiology.CASE SUMMARY In mid-January 2020,a Chinese family made a visit to a local city,and within the next 2 wk one after another fell ill with COVID-19.At the beginning of their first illness onset,the family had eaten in a restaurant,which led to the subsequent illness onset in another two families.All cases were diagnosed as COVID-19 by real-time fluorescent reverse transcription-polymerase chain reaction.Epidemiological investigation showed that the transmission chain was complete.CONCLUSION This chain of social exposure highlights the danger of group aggregative behavior for spread of COVID-19. 展开更多
关键词 COVID-19 Epidemiological investigation Group aggregative behavior Novel coronavirus Pandemic Social exposure Case report
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Positive Research on China’s Economic Growth Quality——Analyze the Fluctuating Situation of the Factor Input and Aggregative Productivity 认领 引用 被引量：2
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作者 LiBtanhua 《Ecological Economy》 2005年第1期98-105,共8页
To analyze China’s fluctuating situation of the factor input and aggregative productivity is not only the main method to seek the source of the economic growth but also the main way to weigh the level of economic gro... To analyze China’s fluctuating situation of the factor input and aggregative productivity is not only the main method to seek the source of the economic growth but also the main way to weigh the level of economic growth quality.As to economic growth ofa country,the improvementofthe productivity is extremely important.The growth of the output can be realized through two kinds of ways: increasing the quantity of factor input of or improving the efficiency of the input and output.There fore, the level of economic growth quality does not mainly depend on the amount of invested factor,but the importance of improving the productivity since resources are rare. The relative improvement of efficiency in use of the invested factor marks the economic growing quality.So,in order to understand the economic growth quality of China to some extent, it must analyze Chinese factor input and aggregative productivity. This is the main topic that this text will be probed into. 展开更多
关键词 factor input contribution rate of factors aggregative productivity quality of increasing
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Rapid Detection Method for Enteroaggregative Escherichia coliUsing Simple Clump Formation and Aggregative Assay 认领 引用
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作者 Miyuki Fujioka Chowdhury Rafiqul Ahsan Yoshimitsu Otomo 《Advances in Microbiology》 CAS 2013年第8期552-556,共5页
Enteroaggregative Escherichia coli (EAggEC) strains cause the persistent diarrhea in infants and compromised hosts in developing countries. These strains are currently defined as E. coli that adheres to HEp-2 cells in... Enteroaggregative Escherichia coli (EAggEC) strains cause the persistent diarrhea in infants and compromised hosts in developing countries. These strains are currently defined as E. coli that adheres to HEp-2 cells in an aggregative adherence (AA) pattern. In this study, we compared 4 different rapid methods for the detection of EAggEC using a PCR assay, clump formation test, glass slide adherence assay, and the HEp-2 cell adherence assay. Out of 683 E. coli strains isolated from diarrheal stool samples, we detected 17 aggR and/or clump-positive strains, and identified 2 aggR-positive, clump-negative strains and 2 aggR-negative, clump-positive strains. All the aggR positive and clump positive strains also showed positive results in glass slide adherence and HEp-2 cell adherence assays. From all these results, we suggest the following procedure for the rapid identification of EAggEC strains: first, screen E. coli strains with the clump formation test and subsequently perform the glass slide adherence assay to observe AA for confirmation. 展开更多
关键词 Escherichia coli Aggregative Adherence Clump Formation Rapid Detection
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Distributed Multi-Energy Trading in Energy Internet:An Aggregative Game Approach 认领 引用 被引量：1
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作者 Jingwei Hu Enhui An +1 位作者 Qiuye Sun Bonan Huang 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2025年第4期1786-1796,共11页
Generally,energy trading in smart grid is realized by microgrids.Correspondingly,energy trading in energy internet relies on small-scale energy systems,named as Weenergies(WEs).Previous works on the distributed energy... Generally,energy trading in smart grid is realized by microgrids.Correspondingly,energy trading in energy internet relies on small-scale energy systems,named as Weenergies(WEs).Previous works on the distributed energy trading focused on the trading platform or trading mechanism based on distributed communication.However,most ignored the fact that there is no express delivery of energy trading,and the transmission of energy depends on a fixed physical topology.Energy transactions without considering the transmission distance will increase the difficulty of energy scheduling and the transmission cost of energy.Aiming at this problem,an aggregation game among WEs is proposed for two-way multi-energy trading,and a distributed algorithm is designed to solve the Nash equilibrium.Since each WE only needs to communicate with its neighbors to exchange information,this distributed process reduces communication burden and improves information security.Furthermore,a multi-energy transmission optimization model is established to determine the transmission path of the transmission energy,which can minimize the transmission cost.Subsequently,to reduce the influence of real-time fluctuations of renewable energy and load,a receding horizon control algorithm is designed to improve the reliability of the proposed game.Finally,the effectiveness in dealing with two-way multi-energy trading of the proposed strategy is verified through simulations on the five connected WEs. 展开更多
关键词 Aggregative game multi-energy trading multienergy transmission Nash equilibrium we-energy
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A Compressed Gradient Tracking Method for Distributed Aggregative Optimization 认领 引用
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作者 WANG Tongyu LEI Jinlong 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2025年第6期2428-2453,共26页
In this paper,the authors propose a distributed gradient tracking algorithm with compressed communication to address an aggregative optimization problem under communication constraints.The problem involves minimizing ... In this paper,the authors propose a distributed gradient tracking algorithm with compressed communication to address an aggregative optimization problem under communication constraints.The problem involves minimizing the sum of local cost functions,where each cost function depends on both local and global state variables.The authors aim to solve this optimization problem through local computation and efficient communication among agents in a network,without the need for a central coordinator.The proposed algorithm combines the variable tracking method to estimate global state variables and a compressed communication scheme to reduce communication costs during the optimization process.Among which,the compressed scheme can encompass both biased and unbiased compressors.Despite the loss of some transmitting information due to quantization,the proposed algorithm can still achieve the exact optimal solution with a linear convergence rate.The authors validate the theoretical results through simulation experiments on an optimal placement problem. 展开更多
关键词 Aggregative optimization compression communication distributed algorithm gradient tracking
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Land use type shapes carbon pathways in Tibetan alpine ecosystems:Characterization of 13C abundance in aggregates and density fractions 认领 引用 被引量：1
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作者 Xin Wan Dangjun Wang +7 位作者 Junya Li Shuaiwen Zhang Linyang Li Minghui He Zhiguo Li Hao Jiang Peng Chen Yi Liu 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2026年第2期448-459,共12页
Insight into the carbon turnover in soil aggregates and density fractions is essential for reducing the uncertainty in estimating carbon pools on the Tibetan Plateau,and how they vary with land use type is unclear.In ... Insight into the carbon turnover in soil aggregates and density fractions is essential for reducing the uncertainty in estimating carbon pools on the Tibetan Plateau,and how they vary with land use type is unclear.In this study,the effect of land use type on carbon storage and fractionation was quantified based on organic carbon and its13C abundance at the microscale of soil aggregates and density fractions in Tibetan alpine ecosystems.The sequence of soil aggregate destruction in the land use types of plantation(13.1%)<shrubland(32.7%)<grassland(47.9%)<farmland(61.8%)shows that plantations strengthen the soil structure.Plantation land had a greater contribution of light fraction organic carbon(28.3%)but a lower contribution of mineral-associated organic carbon(40.6%)to the carbon stock compared to farmland(13.5 and 70.3%).Interestingly,plantation land enhanced the aggregational differentiation of organic carbon and13C in each density fraction,whereas no such phenomenon existed in the soil organic carbon.Carbon isotope analyses revealed that carbon transfer in the plantation land occurred from the light fraction in macroaggregates(–24.9‰)to the mineral-associated fraction in microaggregates(–19.9‰).When compared to the other three land use types,the low transferability of carbon in aggregates and density fractions in plantation land provides a stable carbon pool for the Tibetan Plateau.This study shows that plantations can mitigate global climate change by slowing carbon transfer and increasing carbon storage at the microscale of aggregates and density fractions in alpine regions. 展开更多
关键词 land use type soil aggregate density fractions carbon transfer Tibetan Plateau
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Influence of aggregate particle size on fracture behavior and energy evolution of cemented rockfill in the post-peak stage 认领 引用 被引量：1
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作者 Zhu Li Weibing Zhu +4 位作者 Qingdong Qu Jialin Xu Guorui Feng Chunlei Guo Jingmin Xu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第3期667-685,共19页
Cemented rockfill(CRF)combines structural support with sustainable reuse of coal-derived solid waste.This study integrates digital image correlation,acoustic emission monitoring,and finite-discrete element simulations... Cemented rockfill(CRF)combines structural support with sustainable reuse of coal-derived solid waste.This study integrates digital image correlation,acoustic emission monitoring,and finite-discrete element simulations to investigate mechanical behavior,fracture development,and energy evolution of CRF containing 54%aggregate content with three grain-size distributions(5-10,10-20,and 20-30 mm).Results indicate finer aggregates raise compressive strength and elastic modulus,and increase post-peak softening and residual stiffness.Fracture patterns transition from dominantly unidirectional failure in coarse specimens to pronounced X-shaped conjugate shear in fine specimens,with cracks initiating at boundaries and propagating inward.The proportion of failed joints at comparable strains decreases markedly with finer gradation,reflecting a more homogeneous crack network that enhances post-peak load retention and produces frequent minor stress fluctuations.Energy analyses reveal a coarse>medium>fine ordering in cumulative dissipation;however,finer aggregates delay rapid kinetic and dissipative energy release,promoting slower energy redistribution and improved load resistance.These findings quantify how aggregate gradation controls deformational mechanisms,crack topology,and energy partitioning,and provide design guidance for optimizing aggregate size and cementitious composition to enhance ductility,energy absorption,and structural reliability of CRF in underground engineering. 展开更多
关键词 Cemented rockfill(CRF) Aggregate particle size Post-peak bearing characteristics Crack propagation Energy evolution
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Influence of grazing patterns on the stability of soil aggregates in semi-arid grasslands 认领 引用 被引量：1
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作者 LI Haonian MENG Ruibing +2 位作者 MENG Zhongju GE Rile WU Xiaolong 《Journal of Arid Land》 SCIE CAS CSCD 2026年第2期322-338,共17页
Global grassland degradation necessitates the identification of sustainable grazing management strategies.In semi-arid regions,grazing exclusion(GE),cold-season grazing(CG),and free grazing(FG)represent common practic... Global grassland degradation necessitates the identification of sustainable grazing management strategies.In semi-arid regions,grazing exclusion(GE),cold-season grazing(CG),and free grazing(FG)represent common practices in grassland ecosystems,yet the long-term ecological consequences of these patterns on plant community structure and soil aggregate stability remain inadequately elucidated.In this study,we evaluated the effects of GE,CG,and FG on soil organic carbon,soil water content,soil bulk density,soil aggregates,and vegetation indicators in Xilamuren steppe,a semi-arid grassland in northern China through field sampling and laboratory analyses in 2024.Our findings revealed that,compared to CG and FG,GE significantly enhanced aboveground and belowground biomass,species diversity,and soil physical-chemical properties in the 0–30 cm layer.The dominant plant species in GE and CG sites were Stipa krylovii,Leymus chinensis,and Agropyron cristatum,whereas Stipa krylovii,Artemisia frigida,and Leymus chinensis were predominant in FG site.Different grazing patterns led to distinct soil aggregate distributions,with>2.00 andCG>FG.Furthermore,random forest modeling identified plant species diversity,plant growth traits,and grazing patterns as the primary determinants of soil aggregate stability.Collectively,these results offer valuable insights into the sustainable management and ecological restoration of semi-arid grasslands under different grazing pressures. 展开更多
关键词 soil aggregate stability grazing patterns grazing exclusion species diversity soil physical-chemical properties semi-arid grasslands
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Numerical Mesoscale Analysis of Rubber Size, Rubber Content, and Specimen Size Effects on Crumb Rubber Concrete Using BFEM 认领 引用 被引量：1
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作者 Mahmoud M.A.Kamel Yu Fu +2 位作者 S.Z.Abeer Zaman Mohamed Al-Delfi Yijiang Peng 《Computers, Materials & Continua》 SCIE EI 2026年第6期1045-1063,共19页
Crumb rubber concrete(CRC)has emerged as a sustainable solution to the environmental challenges posed by rubber waste.This study introduces an advanced mixed-random-aggregate mesoscale model for CRC based on the Base ... Crumb rubber concrete(CRC)has emerged as a sustainable solution to the environmental challenges posed by rubber waste.This study introduces an advanced mixed-random-aggregate mesoscale model for CRC based on the Base Force Element Method(BFEM)and the complementary energy principle.The model incorporates different rubber substitution ratios(0%-30%),rubber particle sizes(2 mm and 4 mm),and specimen dimensions(edge lengths of 100,150,and 300 mm).These parameters are considered to investigate their effects on the mechanical properties and failure mechanisms of CRC.Accordingly,the numerical results include stress-strain responses,elastic modulus,and damage progression patterns.The results indicate that increasing rubber content leads to a pronounced reduction in both tensile and compressive strengths.This drop occurs mainly because rubber particles have a much lower elastic modulus.Thus,they represent stress concentrators and weak points,which accelerate the sample failure.Moreover,for the same replacement ratio,CRC with smaller rubber particles(2 mm)exhibits lower strength than CRC with larger particles(4 mm).This reduction occurs because the finer particles create more interfacial areas,introducing more sites for defect initiation and micro-cracks.In addition,increasing specimen size is associated with reduced strength and elastic modulus,highlighting size-dependent phenomena in CRC.The numerical predictions show good agreement with experimental results reported in the literature. 展开更多
关键词 Base force element method(BFEM) complementary energy principle crumb rubber concrete(CRC) meso-damage analysis random aggregate model
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Cold-bonded lightweight aggregates as replacement materials for road applications 认领 引用 被引量：1
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作者 Yu Liu Zhenzhen He +3 位作者 Chengwang Zhou Yulin He Zhen Leng Jiaji Ma 《Journal of Road Engineering》 EI CAS 2026年第2期177-200,共24页
The development of road materials as alternatives to mineral aggregates has become an important research direction.This paper proposes cold-bonded lightweight aggregates(R-CBLA)as substitutes for conventional aggregat... The development of road materials as alternatives to mineral aggregates has become an important research direction.This paper proposes cold-bonded lightweight aggregates(R-CBLA)as substitutes for conventional aggregates and prepares lightweight aggregate-modified soil(LA-Soil)and lightweight aggregate-hydraulic bound mixtures(LA-HBM)for subgrade and base applications.By adjusting the rotation speed of the extrusion granulator,feeding rate,and raw material moisture,R-CBLA can be produced with a granulation rate higher than 90%.Its water absorption shows a significant negative correlation with strength,while bulk density exhibits a significant positive correlation,thus providing a theoretical basis for optimizing performance.In LA-Soil,incorporating 40%–50%R-CBLA with natural coarse grains develops a skeleton-dense structure,which enhances dry density,CBR,and resilient modulus,while still maintaining durability under freeze-thaw cycles.In LA-HBM,two critical replacement thresholds are identified,performance changes are limited below 25%,performance decreases moderately but remains technically feasible between 25%and 75%,the skeleton structure becomes unstable and performance declines sharply beyond 75%.Cost analysis further shows that R-CBLA offers advantages in materials,transportation,and construction,with maximum cost reductions reaching 87%.This economic benefit is especially pronounced in resource-scarce regions.In conclusion,the study verifies the feasibility of R-CBLA in road engineering,proposes a long-life pavement design concept,and emphasizes largescale production,systematic performance optimization,and long-term durability as priorities for future research. 展开更多
关键词 Road engineering materials Cold-bonded lightweight aggregate Lightweight aggregate-modified soil(LA-Soil) LA-hydraulically bound mixture(LA-HBM) Mechanical properties and cost-performance
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Mix Proportion Optimization of RAC Based on Dry-Wet Close Packing Model 认领 引用
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作者 SUN Bo ZHANG Meixiang +3 位作者 YANG Xiaolin DING Yahong WANG Xingguo ZHANG Xianggang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第2期448-462,共15页
To explore mix proportion design of RAC with aggregates tightly packed,the dry and wet packing density of recycled coarse aggregates mixture system and recycled coarse and fine aggregates were tested,then the influenc... To explore mix proportion design of RAC with aggregates tightly packed,the dry and wet packing density of recycled coarse aggregates mixture system and recycled coarse and fine aggregates were tested,then the influence of replacement rate and particle size ratio on the packing density of particle system was explored,the packing density prediction model of recycled coarse aggregates based on particle morphology was constructed,and the mix proportion optimization for recycled aggregate concrete with dry-wet packing model was carried out.The experimental results show that,with the increasing of recycled aggregate replacement rate or fine-grained volume ratio,the dry packing density of recycled coarse aggregates decreases gradually.With the increasing of replacement rate,the particle gradation can be optimized by increasing coarsegrained volume ratio.There is a significant effect for particle morphology parameter K and the particle size ratio on the packing density of the binary mixed system,and the packing density prediction model of recycled coarse aggregates based on particle morphology was constructed.The maximum increase in compressive strength and tensile strength of RAC with mix proportion optimized by the dry-wet packing model are 12.94%and 11.09%,and the cementitious materials is reduced by 21.83%,then the superiority of the mix proportion optimization of RAC with the dry-wet close packing model is confirmed.The results of this paper can provide a theoretical basis for the mix proportion design of RAC. 展开更多
关键词 recycled aggregate concrete mix proportion design wet packing model aggregate morphology packing density
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Effect of Strength Grade on Frost Resistance of Recycled Aggregate Concrete and Performance of Second-Generation Recycled Aggregate 认领 引用
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作者 ZHU Pinghua FU Miaorui +2 位作者 CHEN Xintong JIANG Feifei LIU Ronggui 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第3期717-722,共6页
The usage and recyclability of recycled aggregate concrete(RAC)are critical for addressing construction waste disposal.However,there is still uncertainty about the reusability of freeze-thaw damaged RAC when using 100... The usage and recyclability of recycled aggregate concrete(RAC)are critical for addressing construction waste disposal.However,there is still uncertainty about the reusability of freeze-thaw damaged RAC when using 100%recycled aggregates.The frost durability and recyclability of fully replaced recycled concrete with different strength grades(C40,C50,and C60)were investigated.The recyclability was evaluated based on the physical properties of the second-generation recycled aggregate(2nd-RCA).The results showed that all the RAC met the target compressive strength requirements.The tensile strength of C50 RAC was close to that of C60 RAC.The higher cement content in C60 RAC made it more brittle.C60 RAC exhibited the best frost resistance,in terms of mass loss and relative dynamic modulus of elasticity.However,during the crushing process to prepare the 2nd-RCA,the excessively high strength made it difficult for the adhesive mortar to peel off from C60 RAC,and the additional crushing process caused microcracks.The 2nd-RCA produced from C50 RAC was of the best quality and had the highest output rate.Nonetheless,all the 2nd-RCA from the three strength grades of RAC demonstrated the capability for cyclic use in freeze-thaw environments. 展开更多
关键词 strength grade frost resistance recycled aggregate concrete second-generation recycled coarse aggregate
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Crop rotation-induced soil aggregate restructuring enhances fertilizer nitrogen retention on the Loess Plateau of China 认领 引用
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作者 Haidi Wang Bin Yan +6 位作者 Xingkang Ma Yuhong Gao Zhengjun Cui Bing Wu Yifan Wang Jing Han Mingli Wan 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2026年第8期3427-3439,共13页
Soil aggregates highly regulate nitrogen(N)turnover,yet their functions in regulating N retention under long-term crop rotation remain unclear.This study used15N-labeled fertilizer N to investigate how different-si... Soil aggregates highly regulate nitrogen(N)turnover,yet their functions in regulating N retention under long-term crop rotation remain unclear.This study used15N-labeled fertilizer N to investigate how different-sized soil aggregates regulate fertilizer N retention and redistribution under long-term crop rotation systems.The results revealed that large macroaggregates exhibited a more pronounced depletion of fertilizer N(enrichment factor,Ef:0.73-0.95)than of total N(Ef:0.93-1.00).In contrast,macroaggregates and microaggregates enriched fertilizer N(Ef:1.00-1.16).Crucially,we found a temporal divergence:after harvest(with new15N-labeled fertilizer application),macroaggregates preferentially sequestered new N(current-season fertilizer N),whereas microaggregates dominated the stabilization of old N(previous-year fertilizer N)in the absence of15N-labeled fertilizer in 2024.This functional specialization is driven by aggregate turnover,whereby disintegrating macroaggregates release old N for stabilization in microaggregates,while reforming macroaggregates encapsulate new N.The accelerated release of fertilizer N from these macroaggregates during crop cultivation supplies N to crops,while their reformation concurrently enriches new N.This process underscores the dual functions of macroaggregates in both supplying N to crops and enriching new N.Ultimately,crop rotations reinforce this beneficial dynamic by restructuring soil aggregation,leading to a marked expansion of the soil N pool,with fertilizer N storage increasing by 27.11-111.68%and total N storage by 2.94-14.22%compared to continuous cropping.Our findings establish the functional heterogeneity of soil aggregates as a key mechanism for long-term fertilizer N retention and stabilization.This provides a mechanistic basis for optimizing N management under crop rotations. 展开更多
关键词 15N-labeled fertilizer long-term crop rotation soil aggregates aggregates function nitrogen turnover
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Unveiling vegetation restoration effect on the heavy metal immobilization and aggregate-associated organic carbon in lead-zinc tailings 认领 引用
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作者 Tao Tian Chunyue Wu +2 位作者 Chuangye Yao Shuai Yi Zulfiqar Ali Sahito 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第5期687-696,共10页
Tailings contaminated with multiple metals represents a significant environmental concern owing to their toxicity,persistence,and capacity to bioaccumulate within the food chain.Heavy metal distribution in tailings is... Tailings contaminated with multiple metals represents a significant environmental concern owing to their toxicity,persistence,and capacity to bioaccumulate within the food chain.Heavy metal distribution in tailings is closely linked to aggregate-related characteristics.To elucidate the effect of vegetation restoration on heavy metals and organic carbon in lead-zinc tailings,this study investigated tailing aggregates across four different vegetation coverage types:dense area(DA),sparse area(SA),bare area(BA),and control group(CK).The results showed that the heavy metals in lead-zinc tailings were mainly Pb,Cd,Cu,and Zn.Heavy metals in tailings accumulate more readily in microaggregates,while macroaggregates have lower heavy metal concentrations.With the improvement of vegetation restoration,the form transformation of heavy metals occurred,and the residual-state Pb,Cd,Cu,and Zn in tailings increased.In addition,vegetation restoration promoted macroaggregate formation and enhanced aggregate stability in tailings.Macroaggregates in tailings contained higher organic carbon contents relative to microaggregates,and vegetation restoration enhanced the sequestration and accumulation of organic carbon in tailing aggregates.Correlation analysis indicated that the tailing pH was negative correlated with acid-soluble Cd,acid-soluble Cu,and acid-soluble Zn in tailings.A positive correlation was found between aggregate stability and macroaggregate-associated organic carbon,along with a strong negative correlation between organic carbon in<0.05 mm and acid-soluble Cd,Cu,and Zn.These findings suggest that vegetation restoration regulates heavy metal concentrations,enhances aggregate stability,and promotes organic carbon sequestration in lead-zinc tailings. 展开更多
关键词 Heavy metals Vegetation restoration Aggregates Organic carbon Lead-zinc tailings
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Effect of Fly Ash on Frost Resistance and Regeneration of Recycled Aggregate Concrete 认领 引用
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作者 ZHU Pinghua CHRISTIAN Bihoza +3 位作者 CHEN Xintong WANG Xingjie LIU Hui YAN Xiancui 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第1期138-146,共9页
We investigated the effects of fly ash(FA)content on the mechanical properties of recycled aggregate concrete(RAC)and its regeneration potential under freeze and thaw(F-T)cycles.The physical properties of second-gener... We investigated the effects of fly ash(FA)content on the mechanical properties of recycled aggregate concrete(RAC)and its regeneration potential under freeze and thaw(F-T)cycles.The physical properties of second-generation recycled concrete aggregates(RCA)were used to analyze the regeneration potential of RAC after F-T cycles.Scanning electron microscopy was used to study the interfacial transition zone microstructure of RAC after F-T cycles.Results showed that adding 20%FA to RAC significantly enhanced its mechanical properties and frost resistance.Before the F-T cycles,the compressive strength of RAC with 20%FA reached 48.3 MPa,exceeding research strength target of 40 MPa.A majority of second-generation RCA with FA had been verified to attain class Ⅲ,which enabled their practical application in non-structural projects such as backfill trenches and road pavement.However,the second-generation RCA with 20%FA can achieve class Ⅱ,making it ideal for 40 MPa structural concrete. 展开更多
关键词 fly-ash content frost resistance recycled aggregate concrete microstructure regeneration potential
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