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Time-efficient Strategic Power Dispatch for District Cooling Systems Considering Evolution of Cooling Load Uncertainties

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CSEE Journal of Power and Energy Systems 2022年第5期8卷 1457-1467页

作者： ge Chen Biao yan Hongcai Zhang Dongdong Zhang Yonghua song State Key Laboratory of Internet of Things for Smart City and Department of Electrical and Computer Engineering University of MacaoMacao 999078China

District cooling system(DCS)provides centralized chilled water to multiple buildings for air conditioning with high energy-efficiency and operational *** is one of the most popular cooling systems for large buildings in modern cities and an important demand response source for power *** order to enhance its energy efficiency and utilize its flexibility,strategic operation is ***,finding an optimal policy for DCS operation is a challenging task because of the high inter-connectivity among *** evolution of cooling load uncertainties further increases the *** paper addresses the aforementioned challenges by proposing a novel optimal power dispatch model for *** proposed model optimizes water temperature and mass flow rates simultaneously to improve the energy efficiency as much as *** also explicitly describes the uncertainty accumulation and ***-constrained programming is employed to guarantee the cooling service *** further propose a more timeefficient formulation to overcome the computational intractability caused by the non-smooth and non-convex *** experiments based on a real DCS confirm that a time-efficient formulation can save about half of solution time with negligible cost increase.

关键词： District cooling system HVAC cooling power dispatch demand-side flexibility chance-constrained programming

Inactivation and risk control of pathogenic microorganisms in municipal sludge treatment:A review

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Frontiers of Environmental Science & Engineering 2022年第6期16卷 23-45页

作者： Mengtian Li ge song Ruiping Liu Xia Huang Huijuan Liu State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Center for Water and Ecology School of EnvironmentTsinghua UniversityBeijing 100084China School of Environment Tsinghua UniversityBeijing 100084China

The rapid global spread of coronavirus disease 2019(COVID-19)has promoted concern over human pathogens and their significant threats to public health *** monitoring and control of human pathogens in public sanitation and health facilities are of great *** sludge is an inevitable byproduct of sewage that contains human and animal feces in wastewater treatment plants(WWTPs).It is an important sink of different pollutants and pathogens,and the proper treatment and disposal of sludge are important to minimize potential risks to the environment and public ***,there is a lack of comprehensive analysis of the diversity,exposure risks,assessment methods and inactivation techniques of pathogenic microorganisms in *** on this consideration,this review summarizes the control performance of pathogenic microorganisms such as enterovirus,Salmonella spp.,and Escherichia coli by different sludge treatment technologies,including composting,anaerobic digestion,aerobic digestion,and microwave irradiation,and the mechanisms of pathogenic microorganism inactivation in sludge treatment processes are ***,this study reviews the diversity,detection methods,and exposure risks of pathogenic microorganisms in *** review advances the quantitative assessment of pathogenic microorganism risks involved in sludge reuse and is practically valuable to optimize the treatment and disposal of sludge for pathogenic microorganism control.

关键词： Sludge treatment Pathogenic microorganisms Inactivation mechanisms Exposure risks Land application

A Novel Adaptive Kalman Filter Based on Credibility Measure

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IEEE/CAA Journal of Automatica Sinica 2023年第1期10卷 103-120页

作者： Quanbo ge Xiaoming Hu Yunyu Li Hongli He Zihao song IEEE the School of Automation Nanjing University of Information Science and TechnologyNanjing 210044 Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET) Nanjing University of Information Science&TechnologyNanjing 210044China KTH Royal Institute of Technology Stockholm 10044Sweden the School of Automation Hangzhou Dianzi UniversityHangzhou 310000China the Testing Institute Chinese Flight Test EstablishmentXi’an 710000China the School of Electrical and Automation Engineering East China Jiaotong UniversityNanchang 330000China

It is quite often that the theoretic model used in the Kalman filtering may not be sufficiently accurate for practical applications,due to the fact that the covariances of noises are not exactly *** previous work reveals that in such scenario the filter calculated mean square errors(FMSE)and the true mean square errors(TMSE)become inconsistent,while FMSE and TMSE are consistent in the Kalman filter with accurate *** can lead to low credibility of state estimation regardless of using Kalman filters or adaptive Kalman ***,it is important to study the inconsistency issue since it is vital to understand the quantitative influence induced by the inaccurate *** at this,the concept of credibility is adopted to discuss the inconsistency problem in this *** order to formulate the degree of the credibility,a trust factor is constructed based on the FMSE and the ***,the trust factor can not be directly computed since the TMSE cannot be found for practical *** on the definition of trust factor,the estimation of the trust factor is successfully modified to online estimation of the *** importantly,a necessary and sufficient condition is found,which turns out to be the basis for better design of Kalman filters with high ***,beyond trust factor estimation with Sage-Husa technique(TFE-SHT),three novel trust factor estimation methods,which are directly numerical solving method(TFE-DNS),the particle swarm optimization method(PSO)and expectation maximization-particle swarm optimization method(EM-PSO)are *** analysis and simulation results both show that the proposed TFE-DNS is better than the TFE-SHT for the case of single unknown noise ***,the proposed EMPSO performs completely better than the EM and PSO on the estimation of the credibility degree and state when both noise covariances should be estimated online.

关键词： Credibility expectation maximization-particle swarm optimization method(EM-PSO) filter calculated mean square errors(MSE) inaccurate models Kalman filter Sage-Husa true MSE(TMSE)

Technological innovations on direct carbon mitigation by ordered energy conversion and full resource utilization

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Carbon Neutrality 2022年第1期1卷 598-619页

作者： Liejin Guo Zhisong Ou ya Liu Zhiwei ge Hui Jin Guobiao Ou Mengmeng song Zihao Jiao Wenhao Jing State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityNo.28Xianning West RoadXi’an 710049People’s Republic of China

Coal consumption leads to over 15 billion tons of global CO_(2) emissions annually,which will continue at a considerable intensity in the foreseeable *** remove the huge amount of CO_(2),a practically feasible way of direct carbon mitigation,instead of capturing that from dilute tail gases,should be developed;as intended,we developed two innovative supporting technologies,of which the status,strengths,applications,and perspective are discussed in this *** is supercritical water gasification-based coal/biomass utilization technology,which orderly converts chemical energy of coal and low-grade heat into hydrogen energy,and can achieve poly-generation of steam,heat,hydrogen,power,pure CO_(2),and *** other one is the renewables-powered CO_(2) reduction techniques,which uses CO_(2) as the resource for carbon-based fuel *** combining the above two technical loops,one can achieve a full resource utilization and zero CO_(2) emission,making it a practically feasible way for China and global countries to achieve carbon neutrality while creating substantial domestic benefits of economic growth,competitiveness,well-beings,and new industries.

关键词： Carbon neutrality Coal utilization Direct carbon mitigation Supercritical water gasification Renewable energy CO_(2)reduction

Spatiotemporal Variations and Controls on Anthropogenic Heat Fluxes in 12 Selected Cities in the Eastern China

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Chinese geographical Science 2021年第3期31卷 444-458页

作者： CAO Zheng WEN ya song song HUNG Chak Ho SUN Hui School of geographical Sciences Guangzhou UniversityGuangzhou 510006China Guangdong Province Engineering Technology Research Center for geographical Conditions Monitoring and Comprehensive Analysis Guangzhou 510006China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China College of Resources and Environment South China Agricultural UniversityGuangzhou 510642China S.Department of Urban Planning and Design The University of Hong KongHong Kong 999077China

Spatiotemporal variations of anthropogenic heat flux(AHF)is reported to be associated with global ***,confined to the low spatial resolution of energy consumption statistical data,details of AHF was not well *** obtain high spatial resolution data of AHF,Defense Meteorological Satellite Program/Operational Linescan System(DMSP/OLS)nighttime light time-series product and Moderate Resolution Imaging Spectroradiometer(MODIS)satellite monthly normalized difference vegetation index(NDVI)product were applied to construct the human settlement *** on the spatial regression relationship between human settlement index and energy consumption data.A 1-km resolution dataset of AHF of 12 selected cities in the eastern China was *** least-squares(OLS)model was applied to detect the mechanism of spatial patterns of *** showed that industrial emission in selected cities of the eastern China was accountable for 63%of the total *** emission in megacities,such as Tianjin,Jinan,Qingdao,and Hangzhou,was most *** increasing speed in most areas in the chosen cities was quite *** growth or extremely high growth of AHF were located in central downtown *** Beijing,Shanghai,Guangzhou,Jinan,Hangzhou,Changzhou,Zhaoqing,and Jiangmen,a single kernel of AHF was *** influencing factors showed that precipitation,temperature,elevation,normalized different vegetation index,gross domestic product,and urbanization level were positive with ***,this investigation implied that urbanization level and economic development level might dominate the increasing of AHF and the spatial heterogeneousness of *** urbanization level or economic development level resulted in high increasing speeds of *** findings provide a novel way to reconstruct of AHF and scientific supports for energy management strategy development.

关键词： anthropogenic heat flux(AHF) Defense Meteorological Program/Operational Linescan System(DMSP/OLS)data spatiotemporal variations influencing factors eastern China

Constitutive Modeling for Thixoforming of 9Cr18 Semi-solid Alloy and 3D Forecast Mapping

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Journal of Iron and Steel Research International 2016年第12期23卷 1309-1315页

作者： ya-ping LI Ren-bo song Yong-jin WANG School of Materials Science and Engineering University of Science and Technology Beijing

Thixotropic Compression tests were carried out on 9Cr18 semi-solid alloy through Gleeble-1500 thermal simulation machine. According to the experiment analysis, macro separation occurred during thixoforming. The liquid film was extruded outside to the surface and solidified to form eutectic structure. The solid particles were connected with each other and underwent plastic deformation. According to the comparison between Zhou-Guan model and modified Zhou-Guan model, it could be observed that the adding of thixotropic factor played an important role in the regression and the latter one was more credible. The modified Zhou-Guan model could well describe the thixoforming behavior. 3D forecast mapping was built for 9Cr18 semi solid alloy in thixoforming temperature range. It would provide valuable information for selecting process parameters during thixoforming in the manufacture process.

关键词： thixoforming constitutive model liquid fraction thixotropic factor 3D forecast

An Inf-Sup Stabilized Finite Element Method by Multiscale Functions for the Stokes Equations

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Advances in Applied Mathematics and Mechanics 2009年第2期1卷 273-287页

作者： Zhihao ge Yinnian He Lingyu song School of Mathematics and Information Science Henan UniversityKaifeng 475001P.R.China School of Science Xi’an Jiaotong UniversityXi’an 710049P.R.China School of Science Chang’an UniversityXia’an 710064P.R.China

In the paper,an inf-sup stabilized finite element method by multiscale functions for the Stokes equations is *** key idea is to use a PetrovGalerkin approach based on the enrichment of the standard polynomial space for the velocity component with multiscale *** inf-sup condition for P_(1)-P_(0)triangular element(or Q_(1)-P_(0)quadrilateral element)is *** optimal error estimates of the stabilized finite element method for the Stokes equations are obtained.

关键词： stabilized finite element method multiscale functions Petrov-Galerkin approach inf-sup condition

Experimental study of evaporation of sessile water droplet on PDMS surfaces

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Acta Mechanica Sinica 2013年第6期29卷 799-805页

作者： Ying-song Yu Zi-Qian Wang ya-Pu Zhao Department of Engineering Mechanics School of Civil Engineering & ArchitectureHubei University of Technology State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of Sciences

Evaporation of sessile water droplet on polydimethylsiloxane （PDMS） surfaces with three different curing ratios （5：1, 10：1, and 20：1） was experimentally investigated in this paper. We show that the constant contact radius （CCR） evaporation on surface with high curing ratio lasts longer than that with low curing ratio. We also measured Young＇s moduli of PDMS films by using atomic force microscopy （AFM） and simulated surface deformation of PDMS films induced by sessile water droplet. With increasing curing ratio of PDMS film, Young＇s modulus of PDMS film is getting lower, and then there will be larger surface deformation and more elastic stored energy. Since such energy acts as a barrier to keep the three-phase contact line pinned, thus it will result in longer CCR evaporation on PDMS surface with higher curing ratio.

关键词： Droplet evaporation PDMS Constant contact radius mode Constant contact angle mode Force- displacement curve Surface deformation Liquid-vapor interfacial tension

Human-induced pluripotent stem cell-derived neural stem cell exosomes improve blood-brain barrier function after intracerebral hemorrhage by activating astrocytes via PI3K/AKT/MCP-1 axis

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Neural Regeneration Research 2025年第2期20卷 518-532页

作者： Conglin Wang Fangyuan Cheng Zhaoli Han Bo yan Pan Liao Zhenyu Yin Xintong ge Dai Li Rongrong Zhong Qiang Liu Fanglian Chen Ping Lei Department of geriatrics Tianjin Medical University General HospitalTianjinChina School of Medicine Nankai UniversityTianjinChina Tianjin Neurological Institute TianjinChina

Cerebral edema caused by blood-brain barrier injury after intracerebral hemorrhage is an important factor leading to poor ***-induced pluripotent stem cell-derived neural stem cell exosomes(hiPSC-NSC-Exos)have shown potential for brain injury repair in central nervous system *** this study,we explored the impact of hiPSC-NSC-Exos on blood-brain barrier preservation and the underlying *** results indicated that intranasal delivery of hiPSC-NSC-Exos mitigated neurological deficits,enhanced blood-brain barrier integrity,and reduced leukocyte infiltration in a mouse model of intracerebral ***,hiPSC-NSC-Exos decreased immune cell infiltration,activated astrocytes,and decreased the secretion of inflammatory cytokines like monocyte chemoattractant protein-1,macrophage inflammatory protein-1α,and tumor necrosis factor-αpost-intracerebral hemorrhage,thereby improving the inflammatory *** sequencing indicated that hiPSC-NSC-Exo activated the PI3K/AKT signaling pathway in astrocytes and decreased monocyte chemoattractant protein-1 secretion,thereby improving blood-brain barrier *** with the PI3K/AKT inhibitor LY294002 or the monocyte chemoattractant protein-1 neutralizing agent C1142 abolished these *** summary,our findings suggest that hiPSC-NSC-Exos maintains blood-brain barrier integrity,in part by downregulating monocyte chemoattractant protein-1 secretion through activation of the PI3K/AKT signaling pathway in astrocytes.

关键词： AKT astrocyte blood-brain barrier cerebral edema exosomes human-induced pluripotent stem cells intracerebral hemorrhage neural stem cells neuroinflammation PI3K