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Mechanism and monitoring and early warning technology for rockburst in coal mines

International Journal of Minerals,Metallurgy and Materials 2021年第7期28卷 1097-1111页

作者： xue-qiu he Chao Zhou Da-zhao Song Zhen-lei Li An-ye Cao Shen-quan he Majid Khan School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Coal Resource and Mine Safety China University of Mining and TechnologyXuzhou 221116China

On the basis of the massive amount of published literature and the long-term practice of our research group in the field of prevention and control of rockburst,the research progress and shortcomings in understanding the rockburst phenomenon have been comprehensively *** study focuses on the occurrence mechanism and monitoring and early warning technology for rockburst in coal *** showed that the prevention and control of rockburst had made significant ***,with the increasing mining depth,several unre-solved concerns remain *** the in-depth research and analysis,it can be inferred that rockburst disasters involve three main problems,i.e.,the induction factors are complicated,the mechanism is still unclear,and the accuracy of the monitoring equipment and multi-source stereo monitoring technology is *** monitoring and warning standards of rockburst need to be further clarified and *** with the Internet of Things,cloud computing,and big data,a study of the trend of rockburst needs to be ***-more,the mechanism of multiphase and multi-field coupling induced by rockburst on a large scale needs to be explored.A multisystem and multiparameter integrated monitoring and early warning system and remote monitoring cloud platform for rockburst should be explored and ***-reliability sensing technology and equipment and perfect monitoring and early warning standards are considered to be the de-velopment direction of rockburst in the *** research will help experts and technicians adopt effective measures for controlling rock-burst disasters.

关键词： coal mine rockburst mechanism monitoring and early warning technology multiparameter

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Mechanism investigation on coal and gas outburst: An overview

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International Journal of Minerals,Metallurgy and Materials 2020年第7期27卷 872-887页

作者： Yan-kun Ma Bai-sheng Nie xue-qiu he Xiang-chun Li Jun-qing Meng Da-zhao Song State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology(Beijing)Beijing 100083China Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources China University of Mining and Technology(Beijing)Beijing 100083China Xinjiang Institute of Engineering Urumqi 830023China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 10083China

Coal and gas outburst is a frequent dynamic disaster during underground coal mining *** about 150 years of exploration,the mechanisms of outbursts remain unclear to *** on outburst mechanisms worldwide focused on the physicochemical and mechanical properties of outburst-prone coal,laboratory-scale outburst experiments and numerical modeling,mine-site investigations,and doctrines of outburst *** mechanisms are divided into two categories:single-factor and multi-factor *** multi-factor mechanism is widely accepted,but all statistical phenomena during a single outburst cannot be explained using present *** topics about outburst mechanisms are proposed by summarizing the phenomena that need precise *** most appealing research is the microscopic process of the interaction between coal and *** physical-chemical methods can help characterize the natural properties of outburst-prone *** experiments can compensate for the deficiency of first-hand observation at the *** the original outburst scene by constructing a geomechanical model or numerical model and reproducing the entire outburst process based on mining environment conditions,including stratigraphic distribution,gas occurrence,and geological structure,are *** studies can explore outburst mechanisms at the microscale.

关键词： coal and gas outburst outburst mechanism outburst model outburst simulation microscopic pore structure

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Surface microtopography and micromechanics of various rank coals

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International Journal of Minerals,Metallurgy and Materials 2019年第11期26卷 1351-1363页

作者： Xiang-hui Tian Da-zhao Song xue-qiu he Hui-fang Liu Wei-xiang Wang Zhen-lei Li Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine University of Science and Technology BeijingBeijing 100083China School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China School of Civil Mining and Environmental EngineeringUniversity of WollongongWollongong NSW 2522Australia

For a long time,coalbed gas has brought about various problems to the safety of coal mine *** addition,the mining of gas and coalbed methane(CBM)has attracted much *** occurrence and migration of CBM are believed to be closely related to the micro-surface properties of *** further explore the characteristics of CBM occurrence and migration,in this study,the micro-surface topography,adhesion,and elastic modulus of five metamorphic coals were measured by atomic force microscopy(AFM).The results show that the microtopography of coal fluctuates around 40 nm,reaching a maximum of 66.5 nm and the roughness of the surface decreases with the increase of *** elastic modulus of coal micro-surface varies from 95.40 to 9626.41 MPa,while the adhesion varies from 15.08 to 436.22 nN,and they both exhibit a trend of"M"shape with the increase of ***,a high correlation exists between adhesion and microtopography *** most cases,the adhesion is larger in the concavity area and smaller in the convexity *** research results may provide a new method for revealing the occurrence and migration of CBM and ensure efficient and safe CBM exploitation.

关键词： coal atomic force microscopy microtopography adhesion elastic modulus

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On Social-technical Control of Safety Development in Economic Transition Background

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Frontiers of Engineering Management 2015年第3期2卷 234-240页

作者： xue-qiu he Song Li School of Civil and Environment Engineering University of Science&Technology Beijing Anhui University of Science and Technology

Industrial safety and economic growth, two vital and inextricable forces affecting national culture and development, are worthy of much more interest and attention than this article can hope to generate. Following economic growth, industrial safety remains as a high priority in this nation's quest for sustainable *** present, while China is on its way to transforming its economic structure and growth models, talk of industrial safety appears with special regularity, for it also is undergoing profound changes as an important facet of modern China.

关键词： safety development economic growth economic transition social-technical control

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Spatial structure evolution of overlying strata and inducing mechanism of rockburst in coal mine

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Transactions of Nonferrous Metals Society of China 2014年第4期24卷 1255-1261页

作者：窦林名何学秋贺虎何江范军中国矿业大学煤炭资源与安全开采国家重点实验室徐州221116 中国安全生产科学研究院北京100012 中国矿业大学资源与地球科学学院徐州221116

Spatial structure of overlying strata existed and evolved dynamically with the exploitation scope （boundary conditions） changes in coal mines and to induce rockburst. Based on the“key strata”theory, the integrated spatial structure of overlying strata was put forward, which was composed of “O-X” structure in the plane section and “F” structure in the vertical section. The formation and ongoing instability of the“O-X”and“F”structures were called as dynamic evolution cycle of the overlying strata. Three basic categories of “O-X”, “F” and “T” structures were defined, and the strata behaviors of each spatial structure were analyzed. According to energy theory, mechanism of rockburst induced by spatial structure instability was discussed. The research expanded the scope of traditional ground pressure theory and provided a guide for the prevention of rockburst and mining tremors induced by structure instability of overlying

关键词： spatial structure overlying strata rockburst key strata

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英语教学模式的选择——课堂活动

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山东外语教学 2003年第6期24卷 22-25页

作者：邱学和大庆石油学院外语系黑龙江大庆163318

语言教学必须是一种双向的动态实践活动.基于这样的活动特点涌现出各式各样的教学模式,而"以学生为中心的主题教学模式"是其中的一种.本文作者在使用浙江大学编著的过程中受到一些启发,体会到该模式的科学合理性.本文围绕着活动教学法... 详细信息

语言教学必须是一种双向的动态实践活动.基于这样的活动特点涌现出各式各样的教学模式,而"以学生为中心的主题教学模式"是其中的一种.本文作者在使用浙江大学编著的过程中受到一些启发,体会到该模式的科学合理性.本文围绕着活动教学法阐述个人及他人的看法,从理论内容、开展步骤及注意事项上,介绍自己的有益尝试和取得的相应效果,并提出了改进建议.

关键词：教学模式课堂活动主题教学激励程序交际能力英语教学活动教学法高校

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Substituent Effect on Infrared Spectra and Thermodynamic Properties of Polynitroamino Substituted Cyclopentane and Cyclohexane

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Chinese Journal of Chemical Physics 2008年第6期21卷 526-534页

作者： Ling qiu xue-dong Gong he-ming Xiao Institute for Computation in Molecular and Material Science School of Chemical Engineering Nanfing University of Science and Technology Nanjing 210094 China Key Laboratory of Nuclear Medicine Ministry of Health Jiangsu Institute of Nuclear Medicine Wuxi 214063 China

Density functional theory method was employed to study the effect of the nitroamino group as a substituent in cyclopentane and cyclohexane, which usually construct polycyclic or caged nitramines. Based on the optimized molecular structures of two groups of monocyclic nitramines at the B3LYP/6-31G^＊＊ level, the infrared （IR） spectra were obtained and assigned by harmonic vibrational analysis. The calculated results agree reasonably with the available experimental data. According to the principles of statistic thermodynamics, thermodynamic properties were derived from the IR spectra, which were linearly correlated with the number of nitroamino groups as well as the temperature. The contributions of nitroamino groups to thermodynamic properties are in accord with the group additivity.

关键词： Density functional theory Substituent effect Monocyclic nitramine Infrared spectrum Thermodynamic property

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Theoretical Studies on the Thermodynamic Properties and Detonation Performances of Bicyclic Nitramines:TNAD Isomers

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Chinese Journal of Structural Chemistry 2006年第11期25卷 1309-1320页

作者： qiu Ling XIAO he-Ming GONG xue-Dong JU xue-Hai Institute for Computation in Molecular and Material Science School of Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 China

Ab initio molecular orbital calculations have been performed at Hartree-Fock （HF）, second-order Mrller-Plesset （MP2）, and hybrid density functional theory （DFT） B3LYP levels with 6-31G^＊＊ basis set to investigate the low sensitive explosive trans-1,4,5,8-tetranitro-1,4,5,8- tetraazadecalin （TNAD） and its seven bicyclic isomers. Their molecular geometries, electronic structures, thermodynamic properties, and detonation performances were predicted and compared. The relationships between structures and various properties were discussed in detail. The calculated results agree well with the available experimental data, and suggest that some compounds may be novel potential candidates of high energy density materials （heDMs） with performances better than TNT （2,4,6-trinitrotoluene） and similar to RDX （1,3,5-trinitro-1,3,5-triazacyclohexane）.

关键词： bicyclic nitramine Hartree-Fock method MP2 method density functional theory thermodynamic properties detonation performances

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Multimode human–machine interface using a single-channel and patterned triboelectric sensor

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Nano Research 2022年第10期15卷 9352-9358页

作者： Zhiping Feng Qiang he xue Wang Jing Liu Jing qiu Yufen Wu Jin Yang Department of Optoelectronic Engineering Key Laboratory of Optoelectronic Technology and Systems Ministry of EducationChongqing UniversityChongqing 400044China College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing401331China

Triboelectric interfaces have already been extensively researched in the area of human–machine interaction owing to their selfsustainability,low cost,easy manufacturing,and diverse ***,some limitations(e.g.,a large number of electrodes,multiple lines,and chunks)observed in previous works hinder the further development of human–machine interaction ***,a triboelectric encoding interface is proposed by designing the reverse polarity of the tribo-layers to encode the triboelectric output *** to the inversion of the tribo-layers and the number of strip electrodes,this encoding method can realize multipurpose interactive commands by using fewer electrodes and a simple structure only in one macroscopic triboelectric device,which greatly reduces the size of the device as well as the influence of external factors on the coded signal *** a demonstration,a ring with the patterned triboelectric interface(15 mm×20 mm)achieves slide presentation and remote electric device *** addition,the triboelectric sensor has good sensitivity(1.55 V/N)and durability(>30,000 cycles).This new encoding mode shows the high applicability of the operation mode in diversified interactive applications,which provides more design strategies for intelligent control.

关键词： human-machine interfaces smart control triboelectric sensor single electrode nanostructure

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Three-dimensional ultrasound subwavelength arbitrary focusing with broadband sparse metalens

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Science China(Physics,Mechanics & Astronomy) 2022年第2期65卷 50-56页

作者： xue Jiang JiaJie he ChuanXin Zhang HuaLiang Zhao WeiQi Wang DeAn Ta Cheng-Wei qiu Center for Biomedical Engineering School of Information Science and TechnologyFudan UniversityShanghai 200433China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore

Ultrasound focusing in three-dimensional(3 D)space is of crucial and enduring significance in a variety of biomedical and industrial *** ultrasound focusing based on active phase array or passive geometry of bulky size is unable to realize the 3 D arbitrary focusing with subwavelength *** metamaterial of complex deep-subwavelength microstructure has facilitated the advanced airborne-sound-focusing but is inevitably not applicable for underwater ultrasound,restricted by the law between the multi-modes coupling/thermal viscosity and the feature size of the ***,we aim to circumvent the restriction by increasing the feature size of the metamaterial while keeping the compact overall geometry,and realize the robust subwavelength ultrasound focusing with the sparse metalens of the wavelength-scale *** theoretically propose and demonstrate numerically and experimentally the broadband arbitrary ultrasound focusing in 3 D *** axial and off-axis ultrasound focusing with the subwavelength resolution(FWHMhe spatially sparse and compact metalens within one-octave *** advantages of 3 D freewheeling focusing,subwavelength resolution,spatial sparsity,geometric simplicity,and broadband,the sparse metalens would offer more initiatives to advanced researches in ultrasound focusing and empower applications such as precise biomedical imaging and therapy,nondestructive evaluation,integrated and multiplexed ultrasound devices.

关键词： broadband ultrasound focusing sparse metalens subwavelength resolution three-dimensional focusing

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