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STGSA:A Novel Spatial-Temporal Graph Synchronous Aggregation Model for Traffic Prediction

IEEE/CAA Journal of Automatica Sinica 2023年第1期10卷 226-238页

作者： Zebing Wei Hongxia Zhao Zhishuai Li Xiaojie Bu Yuanyuan Chen Xiqiao Zhang Yisheng Lv Fei-Yue Wang the State Key Laboratory for Management and Control of Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China the School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100049China the Shandong Key Laboratory of Smart transportation(Preparation) Shandong Jiao Tong UniversityShanghai 200240China the College of Science China University of PetroleumQingdao 266580China the department of transportation Engineering School of Transportation Science and TechnologyHarbin Institute of TechnologyHarbin 150090China IEEE

The success of intelligent transportation systems relies heavily on accurate traffic prediction,in which how to model the underlying spatial-temporal information from traffic data has come under the *** existing frameworks typically utilize separate modules for spatial and temporal correlations ***,this stepwise pattern may limit the effectiveness and efficiency in spatial-temporal feature extraction and cause the overlook of important information in some ***,it is lacking sufficient guidance from prior information while modeling based on a given spatial adjacency graph(e.g.,deriving from the geodesic distance or approximate connectivity),and may not reflect the actual interaction between *** overcome those limitations,our paper proposes a spatial-temporal graph synchronous aggregation(STGSA)model to extract the localized and long-term spatial-temporal dependencies ***,a tailored graph aggregation method in the vertex domain is designed to extract spatial and temporal features in one graph convolution *** each STGSA block,we devise a directed temporal correlation graph to represent the localized and long-term dependencies between nodes,and the potential temporal dependence is further fine-tuned by an adaptive weighting ***,we construct an elaborated spatial adjacency matrix to represent the road sensor graph by considering both physical distance and node similarity in a datadriven ***,inspired by the multi-head attention mechanism which can jointly emphasize information from different r epresentation subspaces,we construct a multi-stream module based on the STGSA blocks to capture global *** projects the embedding input repeatedly with multiple different ***,the predicted values are generated by stacking several multi-stream *** experiments are constructed on six real-world datasets,and numerical results show that the proposed STGSA

关键词： Deep learning graph neural network(GNN) multistream spatial-temporal feature extraction temporal graph traffic prediction

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Irradiation Resistance of CoCrCuFeNi High Entropy Alloy under Successive Bombardment

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金属学报:英文版 2023年第9期36卷 1482-1492页

作者： Rui Li Lei Guo Yu Liu Qingsong Xu Qing Peng School of Mechanical Engineering University of Science and Technology BeijingBeijing100083China Physics department King Fahd University of Petroleum and Minerals31261DhahranSaudi Arabia K.A.CARE Energy Research and Innovation Center at Dhahran 31261DhahranSaudi Arabia Interdisciplinary Research Center for Hydrogen and Energy storage King Fahd University of Petroleum and Minerals31261DhahranSaudi Arabia

With the excellent irradiation resistance due to the chemical complexity,high entropy alloys have attracted considerable attention in the design of nuclear structural ***,their performance under successive bombardments remains *** this study,we have investigated the irradiation resistance of equiatomic CoCrCuFeNi HEA compared with Ni metal using molecular dynamics *** evolution of defects such as point defects,defect clusters and dislocations after 400 times of bombardments is *** results show that CoCrCuFeNi has fewer point defects than Ni ***,CoCrCuFeNi has smaller interstitial clusters size,lower interstitial-type Frank partial dislocation density,shorter average interstitial-type Frank partial dislocation length and higher average vacancy formation *** findings suggest that CoCrCuFeNi has superior radiation resistance under successive bombardments due to its high entropy effect.

关键词： High entropy alloys Irradiation resistance Defects Dislocations

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The role of Cr content on the corrosion resistance of carbon steel and low-Cr steels in the CO_(2)-saturated brine

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petroleum Science 2023年第2期20卷 1155-1168页

作者： Cai-Lin Wang Hong-Da Guo Jian Fang Sheng-Xian Yu Xiao-Qi Yue Qi-Hui Hu Cui-Wei Liu Jia-Xuan Zhang Rui Zhang Xiu-Sai Xu Yong Hua Yu-Xing Li College of Pipeline and Civil Engineering China University of Petroleum(East China)QingdaoShandong 266580China Shandong Provincial Key Laboratory of Oil&Gas storage and transportation Security China University of Petroleum(East China)QingdaoShandong 266580China School of Materials Science and Engineering China University of Petroleum(East China)QingdaoShandong 266580China Corrosion and Integrity Centre Zhejiang JIULI Hi-Tech Metals Co.LtdHuzhouZhejiang 313000China Institute of Advanced Materials and Technology University of Science and Technology BeijingBeijing100083China Pipechina Engineering Technology Innovation Co. LtdTianjin 300000China

The selection of appropriate materials for the transportation pipelines is of vital importance to ensure the safety operation in Carbon Capture,Utilisation and storage(CCUS).To clarify the effects of Cr content in steel on the resistance against general and localised corrosion,electrochemistry methods combined with pH measurements and various surface analysis techniques were implemented on X65,1Cr,3Cr and 5Cr steel samples in a CO_(2)-saturated solution at 60°C and pH 6.6 during 192 h of ***,thermodynamic and kinetic analyses of the formation of the corrosion products on carbon steel and low-Cr steels were *** results show that the general corrosion resistance increased with rising Cr content without the presence of significant corrosion products ***,with the formation and development of the corrosion products,the general corrosion resistance reduced with the increase in Cr *** formation of the compact crystalline FeCO3 on X65 and 1Cr steel surfaces offered superior general corrosion protection,while cannot provide enough localised corrosion *** contrast,the double-structural corrosion product layers on 3Cr and 5Cr steels notably suppressed the localised corrosion,but providing poor protection against general corrosion over long immersion *** study reveals the contributions of Cr content on general and localised corrosion resistance at various periods,providing references for material selection and evaluation in CO_(2) environments relevant for CCUS.

关键词： CO_(2)corrosion Material selection Cr content CCUS

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A MODEL FOR PREDICTING PHASE INVERSION IN OIL-WATER TWO-PHASE PIPE FLOW

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Journal of Hydrodynamics 2006年第3期18卷 310-314页

作者： GONG Jing LI Qing-ping YAO Hai-yuan YU Da department of Oil and Gas storage and transportation China University of Petroleum （Beijing） Beijing 102249China China National Offshore Oil Cooperation Research Center Jing Xin Mansion Beijing 100027 China

Experiments of phase inversion characteristics for horizontal oil-water two-phase flow in a stainless steel pipe loop （25.7 mm inner diameter,52 m long） are conducted. A new viewpoint is brought forward about the process of phase inversion in oil-water two-phase pipe flow. Using the relations between the total free energies of the pre-inversion and post-inversion dispersions, a model for predicting phase inversion in oil-water two-phase pipe flow has been developed that considers the characteristics of pipe flow. This model is compared against other models with relevant data of phase inversion in oil-water two-phase pipe flow. Results indicate that this model is better than other models in terms of calculation precision and applicability. The model is useful for guiding the design for optimal performance and safety in the operation of oil-water two-phase pipe flow in oil fields.

关键词： two-phase flow oil water phase inversion,prediction model

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Experimental Analysis of the Flow Characteristics of an Adjustable Critical-Flow Venturi Nozzle

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Fluid Dynamics & Materials Processing 2023年第3期19卷 754-765页

作者： Chun Ye Jingjing Gao Zhihui Wang Weibiao Zheng Yibei Wang Xingkai Zhang Ming Liu Cooperative Innovation Center of Unconventional Oil and Gas(Ministry of Education&Hubei Province) Yangtze UniversityWuhan430100China Hubei Oil and Gas storage and transportation Engineering Technology Research Center Wuhan430100China Key Laboratory of Drilling and Production Engineering for Oil and Gas Wuhan430100China Siji petroleum Machinery Company SINOPECJingzhou434000China petroleum Engineering Technology Research Institute of Shengli Oilfield Company SINOPECDongying257000China

The response of an adjustable critical-flow Venturi nozzle is investigated through a set indoor experiments aimed to determine the related critical flow rate,critical pressure ratio,and discharge *** effect of a variation in the cone displacement and liquid content on the critical flow characteristics is examined in detail and it is shown that the former can be used to effectively adjust the critical flow *** critical pressure ratio of the considered nozzle is above 0.85,and the critical flow control deviation of the gas flow is within±3%.Liquid flow can reduce the gas critical mass flow rate accordingly,especially for the cases with larger liquid volume and lower inlet *** set of results and conclusions provided are intended to support the optimization of steam injection techniques in the context of heavy oil recovery processes.

关键词： Adjustable critical flow venturi nozzle critical pressure ratio critical mass flow rate gas-liquid two-phase critical flow

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An experimental study on the choked flow characteristics of CO_(2) pipelines in various phases

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Chinese Journal of Chemical Engineering 2021年第4期34卷 17-26页

作者： Yuxing Li Shuaiwei Gu Datong Zhang Qihui Hu Lin Teng Cailin Wang Shandong Provincial Key Laboratory of Oil&Gas storage and transportation Security China University of Petroleum(East China)Qingdao 266555China department of Energy and Power Engineering Tsinghua UniversityBeijing 100084China

High pressure pipeline transportation has been an established technology for economically transporting large amounts of CO_(2).However,there are still issues and associated risks that have to be effectively addressed and adequately *** is well known that a strong JouleThomson Cooling effect can occur when pressurized CO_(2) flows through a choke ***,to investigate the choking characteristics especially the temperature drop of high pressure CO_(2),a new laboratory scale experimental setup(total length of 14.85 m and the inner diameter of 15 mm)was *** choked flow and transient choked flow tests were carried out respectively for pressurized CO_(2) in various initial *** phase transitions and temperature drop characteristics were then studied following the choked flow and the results show that the phase transitions in steady choked flow differs significantly from that in transient choked *** transient choked flow of various initial phases,all the flows downstream would transfer from single phase to gas-liquid twophase ***,the effect of water on transient choked flow of supercritical CO_(2) pipeline was investigated,and the phenomena of solid particles deposition was captured which was paramount importance of ensuring the safety operation of CO_(2)pipelines when throttling by the choke valves.

关键词： CO^(2)pipeline Steady choked flow Transient choked flow Water Temperature drop

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Effect of ammonium based ionic liquids on the rheological behavior of the heavy crude oil for high pressure and high temperature conditions

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petroleum 2022年第4期8卷 552-566页

作者： Sivabalan Sakthivel Sugirtha Velusamy Center for Integrative petroleum Research(CIPR) College of Petroleum Engineering&GeosciencesKing Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia petroleum Engineering Program Department of Ocean EngineeringIndian Institute of Technology MadrasChennai600036India

Heavy crude oil(HCO)production,processing,and transportation forms several practical challenges to the oil and gas industry,due to its higher *** the shear rheology of this HCO is highly important to tackle production and flow *** environmental and economic viability of the conventional methods(thermal or dilution with organic solvents),force the industry to find an *** present study was constructed to investigate the effect of eco-friendly ionic liquids(ILs)on the HCO's rheology,at high temperature and high *** different alkyl ammonium ILs were screened for HCO's shear rheology at the temperatures of 25-100℃ and for pressures 0.1e10 *** addition of ILs reduced the HCO's viscosity substantially from 25 to 33%from their original HCO ***,it aids to reduce the yield stress to about 15-20%at all the studied experimental ***,the viscoelastic property of the HCO was studied for both strain-sweep and frequencysweep and noticed the ILs helps to increase HCO's loss modulus(G00)by reducing storage modulus(G0),it leads to the reduction of the crossover point around 25-32%than the standard *** the ILs addition with HCO converts its solid-like nature into liquid-like ***,the effect ILs chain length was also studied and found the ILs which has lengthier chain length shows better efficiency on the ***,the microscopic investigation of the HCO sample was analyzed with and without ILs and witnessed that these ILs help to fragment the flocculated HCO into smaller *** findings indicate that the ILs could be considered as the better alternative for efficient oil production,processing,and transportation.

关键词： Crude oil Ionic liquids Loss modulus Microscopy storage modulus Viscosity reduction

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Mathematical Model of Natural Gas Desulfurization Based on Membrane Absorption

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China petroleum Processing & Petrochemical Technology 2014年第4期16卷 79-88页

作者： Wang Shuli Ma Jun Wang Ganyu Zhou Heng Jiangsu Key Laboratory of Oil-gas storage and transportation Technology Changzhou University School of petroleum Engineering Changzhou University Changzhou Institute of Engineering Technology

Models of mass transfer kinetics combined with mass transfer differential equation and mass transfer resistance equation were established on the basis of double-film theory. Mass transfer process of H2 S absorption by means of polypropylene hydrophobic microporous hollow fiber membrane contactor was simulated using MDEA(N-methyldiethanolamine) as the absorption liquid and corresponding experiments of natural gas desulfurization were performed. The simulation results indicated that the removal rate of hydrogen sulfide showed positive dependence on the absorption liquid concentration and gas pressure. However, the desulfurization rate showed negative dependence on gas flow. The simulated values were in good agreement with the experimental results. The in-tube concentration of hydrogen sulfide at the same point increased with increase in the gas velocity. Axial concentration of hydrogen sulfide decreased rapidly at the beginning, and the decrease saw a slowdown during the latter half period. Hydrogen sulfide concentration dropped quickly in the radial direction, and the reduction in the radial direction was weakened with the increase of axial length due to the gradual reduction of hydrogen sulfide concentration along the tube. The desulfurization rate under given operating conditions can be predicted by this model, and the theoretical basis for membrane module design can also be provided.

关键词： membrane based absorption H2S simulation mass transfer

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Investigation of flow behavior of crude oils with emphasis to upper Assam Basin,India

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petroleum Research 2022年第2期7卷 263-268页

作者： Bondita Robidas Subrata Borgohain Gogoi department of petroleum Technology Dibrugarh UniversityDibrugarhAssamIndia

This paper attempts to investigate the viscoelastic nature of eight Crude Oil(CO)samples from the Upper Assam Basin,*** was studied using Dynamic Mechanical Analysis(DMA)where shear stress was applied to the CO samples and the resulting displacement(shear strain)was *** transportation through pipelines face serious problems due to their high pour(PP)point and *** this work,Dynamic Modulus(G*)was calculated using which the storage and the loss modulus were determined to study the elastic and viscous nature of the samples at 30C as the average Pour Point(PP)of the CO samples was near 30***,especially during the extreme winter season in Assam,when the ambient temperature falls drastically,the lighter components come out from the liquid and precipitates in the inner wall of the pipeline which affects the flow through the ***,a better understanding of the flow behavior of CO is very important as this will help to identify whether flow improving methods are required or ***,in this work viscoelastic properties of the CO samples were investigated from where yield point was *** points or the Yield Point(YP)of the samples were determined to understand the flow characteristics before and after the crossover *** the CO samples were observed to be viscous after the yield point except for two CO *** stress and yield strain of the samples were calculated from the YP,which exhibited non-Newtonian behavior with maximum yield stress up to *** reaching the YP,the CO samples showed the dominance of viscous nature over elastic nature except for two *** tangent or tan q was also calculated to validate the viscoelasticity of the *** study was done to investigate the flow behavior of CO samples of the Upper Assam Basin for pipeline transportation.

关键词： Viscoelasticity Shear strain Yield stress Dynamic modulus Loss tangent

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Interactions between the fluid and an isolation tool in a pipe:laboratory experiments and numerical simulation

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petroleum Science 2016年第4期13卷 746-759页

作者： Hong Zhao Yi-Xin Zhao Zhi-Hui Ye College of Mechanical and transportation Engineering China University of PetroleumBeijing department of Mining China University of Mining and TechnologyBeijing College of petroleum Engineering China University of PetroleumBeijing

A remote-control tether-less isolation tool is a mechanical device that is normally used in pipelines to block the flow at a given position by transforming a blocking module. In this study, the interactions between the fluid and the plug module of the isolation tool were investigated. Simulations of the plug process and particle image velocimetry measurements were performed to study the flow characteristics. Numerical solutions for the continuity, momentum, and energy equations were obtained by using commercial software based on finite-volume techniques. Box–Behnken design was applied, and response surface methodology（RSM）-based CFD simulation analysis was conducted. The dynamic model in the plug process was built by RSM and used to evaluate the influences of the main mechanical parameters on the pressure during the plug process. The diameter of the isolation tool and the diameter of the plug module have strong influences on the process, and the length of the isolation tool has only a little influence on the plug process.

关键词： Isolation tool Numerical simulation Transformation Blockage Response surface methodology

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