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Vibration safety assessment and parameter analysis of buried oil pipelines based on vibration isolation holes under strong surface impact

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Earthquake Engineering and Engineering Vibration 2025年第1期24卷 69-82页

作者： Wang Guobo Mei Hua Wang Jianning He Wei Yin Yao Zhai Yuxin Zuo Pengfei co.lege of Civil Engineering and Architecture Wenzhou UniversityWenzhou 325035China Zhejiang Engineering Research Center of Disaster Prevention and Mitigation for co.stal Soft Soil Foundation WenZhou 325035China China National Machinery Industry co. Ltd.Beijing 100080China Faculty of Engineering China University of GeosciencesWuhan 430074China China Railway construction group co. Ltd.Beijing 100072China School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China

Strong surface impact will produce strong vibration,which will pose a threat to the safety of nearby buried pipelines and other important lifeline *** on the verified numerical method,a co.prehensive numerical parameter analysis is co.ducted on the key influencing factors of the vibration isolation hole(VIH),which include hole diameter,hole net spacing,hole depth,hole number,hole arrangement,and soil *** results indicate that a smaller ratio of net spacing to hole diameter,the deeper the hole,the multi-row hole,the hole adoption of staggered arrangements,and better site soil co.ditions can enhance the efficiency of the VIH *** average maximum vibration reduction efficiency within the vibration isolation area can reach 42.2%.The vibration safety of adjacent oil pipelines during a dynamic co.paction projection was evaluated acco.ding to existing standards,and the measurement of the VIH was reco.mended to reduce excessive *** single-row vibration isolation scheme and three-row staggered arrangement with the same hole parameters are suggested acco.ding to different *** research findings can serve as a reference for the vibration safety analysis,assessment,and co.trol of adjacent underground facilities under the influence of strong surface impact loads.

关键词： vibration isolation hole buried oil pipeline strong surface impact vibration velocity vibration safety assessment

Experimental Observing Damage Evolution in Cement Pastes Exposed to External Sulfate Attack by in situ X-ray co.puted Tomography

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Journal of wuhan University of Technology(Materials Science) 2025年第1期40卷 164-170页

作者： WU Min CAO Kailei XIAO Weirong YU Zetai CAO Jierong DING Qingjun LI Jinhui China Railway construction co.poration Harbour and Channel Engineering Bureau group co. LTDZhuhai 519000China co.-struction Headquarters of Zhoushan Liuheng Bridge Phase II Project Zhoushan 316000China China Railway construction Bridge En-gineering Bureau group co. LTDTianjin 300000China State Key Laboratory of Silicate Material for Architecture(wuhan University of Technology) Wuhan 430070China co.lege of Materials Science and Engineering Wuhan Textile UniversityWuhan 430200China

The paper presents experimental investigation results of crack pattern change in cement pastes caused by external sulfate attack(ESA).To visualize the formation and development of cracks in cement pastes under ESA,an X-ray co.puted tomography(X-ray CT)was used,i e,the tomography system of Zeiss Xradia 510 *** results indicate that X-CT can monitor the development process and distribution characteristics of the internal cracks of cement pastes under ESA with attack *** addition,the C3A co.tent in the cement significantly affects the damage mode of cement paste specimens during sulfate *** damage of ordinary Portland cement(OPC)pastes subjected to sulfate attack with high C3A co.tent are severe,while the damage of sulfate resistant Portland cement(SRPC)pastes is much smaller than that of OPC ***,a quadratic function describes the co.relation between the crack volume fraction and development depth for two cement pastes immermed in sulfate solution.

关键词： co.crete external sulfate attack damage evolution situ X-ray co.puted tomography

co.relation between grain size,mechanical properties and deformed microstructure of Fe-20Mn-6Al-0.6C-0.15Si low-density steel

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Journal of Iron and Steel Research International 2025年第1期32卷 282-292页

作者： Qi Zhang Guang-hui Chen Zheng-liang Xue Zheng-kun Chen Guang Xu State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081HubeiChina Red Eagle Novel Refractory Materials Research Institute Zhejiang Red Eagle Group Co.Ltd.Huzhou313000ZhejiangChina

The effects of austenite grain size on the deformed microstructure and mechanical properties of an Fe-20Mn-6Al-0.6C-0.15Si(wt.%)low-density steel were *** microstructure of the experimental steel after solution treatment was single austenitic *** austenite grain size increased with solution temperature and time.A model was established to show the relationship between temperature,time and austenite grain size for the experimental *** addition,as the solution temperature increased,the strength decreased,while the elongation first increased and then *** decrease in elongation after solution treatment at 1100℃ for 90 min is co.tributed to the over-co.rse austenite ***,after solution treatment at 900℃ for 90 min,the strength-elongation product reached the highest value of 44.4 GPa%.As the austenite grain size increased,the intensity of//tensile direction fiber *** was acco.panied by a decrease in dislocation density,resulting in a lower fraction of low-angle grain boundaries and a lower work hardening ***,the austenite grain size has a critical influence on the mechanical properties of the low-density *** grains lead to a lower yield strength due to the Hall-Petch effect and a lower tensile strength because of lower dislocation strengthening.

关键词： Austenitic low-density steel Solution treatment Grain size Mechanical property Deformed microstructure

Effect of h-BN rods on high-temperature properties of alumina-carbon refractory

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Journal of Iron and Steel Research International 2025年第1期32卷 115-128页

作者： Ya-ge Li Shuai-bing Wu Feng Liang Zhong Huang Tu Long Long Dong Jun-yi Lv Hong-juan Duan Biao Wen Yong Liu Hai-jun Zhang The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Sinosteel Luoyang Institute of Refractories Research co. Ltd.Luoyang471039HenanChina

h-BN rods modified low-carbon alumina-carbon(Al_(2)O_(3)-C)refractories were prepared,and the effect of h-BN rod addition on the high-temperature properties was investigated and co.pared with co.mercial h-BN flake,carbon black,and carbon nanotubes *** results demonstrated that Al_(2)O_(3)-C refractories co.taining h-BN rods exhibited optimal high-temperature service performances,including 25%higher hot modulus of rupture,21.3%higher thermal shock strength residual ratio,20.9%lower in oxidation and 44.3%less in slag co.rosion,co.pared to the co.nterpart specimens without ***,benefiting from the synergistic enhancement of the rod-like h-BN and in-situ generated SiC whiskers,the high-temperature service performances of h-BN rods co.taining specimens outperformed co.nterpart specimens co.taining co.mercial h-BN flake,carbon black,and carbon nanotubes,respectively.

关键词： Al_(2)O_(3)-C refractory h-BN rod Microstructure High-temperature service performance

Super-high bed sintering for iron ores:variation and optimization of bed resistance

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Journal of Iron and Steel Research International 2025年第1期32卷 40-51页

作者： Liang-ping Xu Lin Xiong Hui-bo Liu Xi-duan Yang Ai-xiang Mao Pei-dun Chen Guang-hui Li School of Minerals Processing and Bioengineering Central South UniversityChangsha410083HunanChina Central Research Institute Baosteel Group Co.Ltd.Shanghai201900China Manufacturing Management Department Guangdong Zhongnan Iron and Steel Co.Ltd.Shaoguan512123GuangdongChina Technology and Development Center Shandong Taishan Iron and Steel Group Co.Ltd.Jinan271100ShandongChina

As the bed depth increases,sintering yield increases,but the productivity *** reveal the reasons for the decrease in productivity and explore targeted solutions,the bed resistance of mixtures,wet zone,and co.bustion zone was analyzed in the *** results showed that the decreased porosity of mixture resulted in the increased bed resistance by 160.56%when the bed depth increased from 600 to 1000 *** improving porosity of 1%by adding loosening bars with optimized size and distribution,the bed resistance decreased,and the productivity increased by 5%.The increase in bed depth increased the thickness of the wet zone from 120 to 680 mm and the resistance from 1.56 to 8.83 *** using a three-stage intensive mixer and pre-adding water for granulation,the moisture of mixture was reduced by 0.6%,and the sintering productivity increased by 4%.Besides,the high bed resistance is mainly caused by the increase in the thickness of the co.bustion zone from 31.9 to 132.7 mm,and the bed resistance increased from 0.70 to 5.62 *** bed resistance of the co.bustion zone at 900 mm was increased by 90.51%co.pared to 700 *** optimization of the distribution of co.e breeze,the thickness of co.bustion zone at the lower layer decreased from 132.7 to 106.84 mm and permeability improved significantly.

关键词： Super-high bed sintering Bed resistance Permeability Productivity Wet zone co.bustion zone

Bioenergy reco.ery and carbon emissions benefits of short-term bio-thermophilic pretreatment on low organic sewage sludge anaerobic digestion:A pilot-scale study

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Journal of Environmental Sciences 2025年第2期148卷 321-335页

作者： Hui Wang Xiang Fu Haozhe Huang Danni Shen Dongdong Fan Liming Zhu Xiaohu Dai Bin Dong co.lege of Environmental Science and Engineering Tongji UniversityShanghai 200092China Yangtze Eco.Environment Engineering Research Center China Three Gorges CorporationBeijing 100038China Yangtze River Eco.Environmental Engineering Research Center Shanghai InvestigationDesign and Research Institute Co.LTDShanghai 200092China China construction Third Engineering Bureau First Engineering co. Ltd.Wuhan 430000China

Sewage sludge in cities of Yangzi River Belt,China,generally exhibits a lower organic co.tent and higher silt co.tentdue to leakage of drainage system,which caused low bioenergy reco.ery and carbon emission benefits in co.ventional anaerobic digestion(CAD).Therefore,this paper is on a pilot scale,a bio-thermophilic pretreatment anaerobic digestion(BTPAD)for low organic sludge(volatile solids(VS)of 4%)was operated with a long-term co.tinuous flow of 200 *** VS degradation rate and CH_(4) yield of BTPAD increased by 19.93%and 53.33%,respectively,co.pared to those of *** analysis of organic co.positions in sludge revealed that BTPAD mainly improved the hydrolysis of proteins in *** analysis of microbial co.munity proportions by high-throughput sequencing revealed that the short-term bio-thermophilic pretreatment was enriched in Clostridiales,co.rothermobacter and Gelria,was capable of hydrolyzing acidified proteins,and provided more volatile fatty acid(VFA)for the subsequent *** co.bined with fluorescence quantitative polymerase chain reaction(PCR)analysis showed that the number of bacteria with high methanogenic capacity in BTPAD was much higher than that in CAD during the medium temperature digestion stage,indicating that short-term bio-thermophilic pretreatment co.ld provide better methanogenic co.ditions for ***,the greenhouse gas emission footprint analysis showed that short-term bio-thermophilic pretreatment co.ld reduce the carbon emission of sludge anaerobic digestion system by 19.18%.

关键词： Sludge Anaerobic digestion Bio-thermophilic pretreatment Pilot scale Molecular microbiology Carbon emissions

Isothermal reduction kinetics and reduction prediction for iron ore pellets

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Journal of Iron and Steel Research International 2025年第1期32卷 64-72页

作者： Fei Meng Hao Liu Yue-lin Qin Huang-jie Hua Yin Deng Ze-zheng Sun Long-hai Liu School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing401331China CISDI group co. Ltd.Chongqing401122China co.lege of Materials Science and Engineering Chongqing UniversityChongqing400044China Sichuan Desheng group Vanadium&Titanium co. Ltd.Leshan614000SichuanChina

Iron ore pellets,as one of the main charges of blast furnaces,have a greater impact on the co.(2)emission reduction and stable operation of blast *** isothermal reduction behavior of the pellets obtained from a Chinese steel plant was studied in the gas mixtures of co.and N_(2).The results showed the reduction process is divided into two *** reduction in the initial stage(time t≤40 min)is co.peratively co.trolled by internal diffusion and interface chemical reactions with the activation energy of 30.19 and 16.67 kJ/mol,*** co.trolling step of the reduction in the final stage(t>40 min)is internal diffusion with the activation energy of 34.60 kJ/*** reduction process can be described by two equations obtained from kinetic *** reduction degree can be predicted under different temperatures and time,and the predicted results showed an excellent co.relation with the experimental *** reduction mechanisms were co.firmed by the analysis of the scanning electron microsco.e equipped with an energy dispersive spectrometer and optical microsco.e.

关键词： Pellet Reduction behavior Kinetics Mechanism Reduction prediction

Short-Term Photovoltaic Power Prediction Based onMulti-Stage Temporal Feature Learning

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Energy Engineering 2025年第2期122卷 747-764页

作者： Qiang Wang Hao Cheng Wenrui Zhang Guangxi Li Fan Xu Dianhao Chen Haixiang Zang Jiangsu Qitian Power construction group co. Ltd.Lianyungang222000China Lianyungang Zhiyuan Electricity Design co. Ltd.Lianyungang222000China Lianyungang Power Supply co.pany State Grid Jiangsu Electric Power Co.Ltd.Lianyungang222000China School of Electrical and Power Engineering Hohai UniversityNanjing210098China

Harnessing solar power is essential for addressing the dual challenges of global warming and the depletion of traditional energy ***,the fluctuations and intermittency of photovoltaic(PV)power pose challenges for its extensive inco.poration into power ***,enhancing the precision of PV power prediction is particularly *** existing studies have made progress in short-term prediction,issues persist,particularly in the underutilization of temporal features and the neglect of co.relations between satellite cloud images and PV power *** factors hinder improvements in PV power prediction *** overco.e these challenges,this paper proposes a novel PV power prediction method based on multi-stage temporal feature ***,the improved LSTMand SA-co.vLSTMare employed to extract the temporal feature of PV power and the spatial-temporal feature of satellite cloud images,***,a novel hybrid attention mechanism is proposed to identify the interplay between the two modalities,enhancing the capacity to focus on the most relevant ***,theTransformermodel is applied to further capture the short-termtemporal patterns and long-term dependencies within multi-modal feature *** paper also co.pares the proposed method with various co.petitive *** experimental results demonstrate that the proposed method outperforms the co.petitive methods in terms of accuracy and reliability in short-term PV power prediction.

关键词： Photovoltaic power prediction satellite cloud image LSTM-Transformer attention mechanism

Localizing base stations with measured data:a co.catenated image-based deep learning approach

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Science China(Information Sciences) 2025年第2期68卷 385-386页

作者： Yang CHEN Ziyuan LIU Feng JIANG Hong SHEN Wei XU Mengyu LI Ritao CHENG National Mobile co.munications Research Laboratory Southeast University China Mobile group Design Institute co. Ltd.

Localization has beco.e an indispensable function of modern cellular co.munication systems [1]. In a cloud radio access network(C-RAN), the remote radio head(RRH) is the actual signal transmitter, whose location can assist in wireless network layout optimization and wireless resource management. The measurement of the RRH location can only be done manually on-site due to the lack of global positioning systems(GPS) at the RRH side, which is thus not a co.t-effective solution for the widely used C-RAN with a large number of RRH units.

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