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A review of seismo-electromagnetic research in China

Science China Earth Sciences 2022年第7期65卷 1229-1246页

作者： Guoze ZHAO Xuemin ZHANG Juntao CAI Yan ZHAN Qinzhong MA Ji TANG Xuebin DU Bing HAN Lifeng WANG Xiaobin CHEN Qibin XIAO Xiangyu SUN Zeyi DONG Jijun WANG Jihong ZHANG Ye FAN Tao YE State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China Institute of Earthquake Forecasting China Earthquake AdministrationBeijing 100036China National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing 100085China Shanghai Earthquake Agency Shanghai 200062China China Earthquake Administration Lanzhou Institute of Earthquake Lanzhou 730000China Shandong Earthquake Agency Jinan 250014China China Earthquake Network Center Beijing 100045China

The seismo-electromagnetic(EM)method is an important geophysical method that plays a major role in the observation of seismic anomalies related to earthquake *** is the most promising method for a breakthrough in short-term earthquake *** digital transformation and network upgrading implemented in the“Ninth five-year plan”and“Tenth five-year plan”have optimized the original observation system,improved the quality of observed data,enriched the seismicelectromagnetic information,and enhanced the analysis capability and timeliness of seismic-electromagnetic *** improvements are of major importance for the research on seismo-electromagnetics as well as for the development of new *** the beginning of the 21 st century,China has launched a satellite named CSES that was designed for the generation and study of seismo-electromagnetic data and built a high-power transmitting source and a new CSELF observation network that is used specifically for earthquake *** platform has promoted the full-time three-dimensional EM monitoring and the identification of earthquake *** on the study of anomalies related to earthquake precursors,the physical and numerical simulations,and the study on generation mechanism of anomalies in China,we summarize the characteristics of earthquake EM anomalies and discuss the advantages and disadvantages of different EM observation ***,considering the related questions of the seismo-electromagnetic prediction and implementing the recent developments both in China and abroad,we review the current status of seismo-electromagnetic research and propose strategies for future research.

关键词： Seismo-electromagnetism Seismic anomaly Electromagnetic observation experiment and simulation Earthquake prediction Prospect

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The establishment of the normal contact force model for a one‐dimensional sphere chain subjected to impact load

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International Journal of Mechanical System Dynamics 2022年第1期2卷 131-142页

作者： Jun Liu Futian Zhao Zhimin Xiao Yue Wang Zheng Liu Haowen Zheng Institute of Engineering Safety and Disaster Prevention Hohai UniversityNanjingChina College of Civil and Transportation Engineering Hohai UniversityNanjingChina

The normal contact force determines the behavior of a particle *** investigate the normal contact force in a one‐dimensional sphere chain subjected to impact load,by comparing the simulation results of the existing typical normal contact force models embedded in the discrete element program,an improved normal contact force model was proposed in this *** improved model con-sists of two parts:the Cundall model for loading and the Daniel model for ***,a systematic test was designed to verify the accuracy and applicability of the improved *** results showed that the calculated contact force curves agree well with the experimental ***,the improved model is implemented in the solution algorithm without need for complex numerical methods and parameters fitting,leading to more efficient simulations.

关键词： discrete element method experiment and simulation normal contact force one‐dimensional sphere chain

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Optimization of Combustion Characteristics and Fuel Injection Timing of a New Type Dual-Pit Combustor Rotary Engine

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Energy Engineering 2021年第3期118卷 581-603页

作者： Zhongjia Li Jianfeng Pan Hongjun Liu Baowei Fan Wenming Yang Abiodun Oluwaleke Ojo School of Energy and Power Engineering Jiangsu UniversityZhenjiang212013China Department of Mechanical Engineering National University of Singapore119260Singapore

In order to improve the performance of the rotary engine,this paper has designed a new type of dual-pit rotary engine combustion chamber structure,and compares the combustion and emission characteristics with the rotary engine with a traditional combustion *** existence of the dual-pit combustion chamber strengthens the overall vortex intensity in the cylinder,effectively promotes the mixing process of fuel and air in the cylinder,the maximum combustion pressure in the cylinder increased by 8.6%,significantly increases the diffusion combustion speed,and significantly improves the dynamic performance of the rotary *** this basis,the effects of fuel injection timing parameters on fuel distribution,combustion and emission characteristics were *** distribution is more even and dispersed during injection in the later stage of *** the fuel injection timing was 105°BTDC in the middle of the compression phase,the matching effect of fuel distribution law and ignition scheme was the *** the injection timing was 75°BTDC and 85°BTDC in the late compression stage,the mass fraction of NOx remained at a low *** correlation between soot generation and the change of fuel injection timing was *** the injection time was 85°BTDC,the soot generation remained at a relatively high level.

关键词： Rotary engine combustion chamber structure spray combustion characteristics injection strategy experiment and simulation

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