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Early warning of coal dynamic disaster by precursor of AE and EMR"quiet period"

International Journal of Coal Science & Technology 2022年第3期9卷 106-119页

作者： Shengquan He Mengli Qin liming qiu Dazhao Song Xiufeng Zhang State Key Laboratory of the Ministry of Education of China for High-Efcient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China Research Institute of Macro-Safety Science University of Science and Technology BeijingBeijing 100083China Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard Xi’an 710077China State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization Pingdingshan 467000China Shandong Energy Group Co Ltd Jinan 250014ShandongChina

Efcient and accurate monitoring and early warning of coal dynamic disaster and other disasters can provide guarantee for the efcient operation of mine transportation ***,the traditional threshold early warning method often fails to warning some *** address above issues,a new early warning method was proposed based on"quiet period"phenomenon of AE and EMR during *** is found that,a"quiet period"of AE and EMR was present before the load reaches the peak stress,which could be used as one of the precursors to warn the imminent failure of coal and rock *** and AE signals increased abnormally followed by the phenomenon of"quiet period"before the occurrence of coal dynamic disaster on site,and the decrease of MS events in the"quiet period"is about 57%–88%compared with that in previous abnormal increase *** the damage evolution of coal and rock,"quiet period"phenomenon usually occurred at 85%–90%of the peak stress,where the slope of damage parameter curve is almost ***"quiet period"of the AE-EMR signals and the low change rate of damage parameter before failure provide a theoretical foundation for the coal dynamic disaster warning based on the"quiet period"precursor found in MS-AE-EMR monitoring *** fndings will help reduce the number of under-reported events and improve early warning accuracy.

关键词： Coal dynamic disaster Early warning AE and EMR Quiet period Precursor characteristics

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A venom protein of ectoparasitoid Pachycrepoideus vindemiae, PvG6PDH, contributes to parasitism by inhibiting host glucose-6-phosphate metabolism

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Insect Science 2022年第2期29卷 399-410页

作者： Lei Yang liming qiu Qi Fang Shaoying Wu Gongyin Ye Hainan University Haikou570228 China State Key Laboratory of Rice Biology&Ministry of Agricultural and Rural Affairs Key Laboratory of Molecular Biology of Crop Pathogens and Insects Institute of Insect SciencesZhejiang UniversityHangzhou310058 China

To achieve successful development,female parasitoids,while laying eggs,introduce various virulence factors,mainly venoms,into host insects to manipulate their *** numerous studies have been conducted to characterize the components of venoms that regulate host immune responses,few systematic investigations have been conducted on the roles of venom proteins in host metabolic *** this investigation,we characterized a novel venom protein in Pachycrepoideus vindemiae called glucose-6-phosphate dehydrogenase(PvG6PDH)and showed it has a vital role in regulating host carbohydrate ***6PDH encodes 510 amino acids and features a signal peptide and two conserved“G6PDH”*** sequence alignment showed it has high amino acid identity with G6PDH from other pteromalids,and quantitative polymerase chain reaction analysis and immunofluorescent staining demonstrated a significantly higher expression of PvG6PDH in the venom apparatus compared with the *** report that PvG6PDH contributes to parasitism by inhibiting the glucose-6-phosphate(G6P)metabolism of host Drosophila melanogaster,as demonstrated by PvG6PDH injection and RNA interference *** tests revealed that the accumulation of host G6P was caused by the transcriptional inhibition of G6P-metabolism-related *** findings greatly contribute to our understanding of venom-mediated host metabolic regulation,further laying the foundation for the development of venom proteins as biological agents for pest control.

关键词： biological control metabolism Pachycrepoideus vindemiae parasitoid venom

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Experimental study on the infrared precursor characteristics of gas-bearing coal failure under loading

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International Journal of Mining Science and Technology 2021年第5期31卷 901-912页

作者： Shan Yin Zhonghui Li Dazhao Song Xueqiu He liming qiu Quan Lou He Tian School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China School of Municipal and Environmental Engineering Henan University of Urban ConstructionPingdingshan 467036China

The stress and gas pressure in deep coal seams are very high,and instability and failure rapidly and intensely *** is important to study the infrared precursor characteristics of gas-bearing coal instability and *** this paper,a self-developed stress-gas coupling failure infrared experimental system was used to analyse the infrared radiation temperature(IRT)and infrared thermal image precursor characteristics of gas-free coal and gas-bearing *** changes in the areas of the infrared temperature anomalous precursor regions and the effect of the gas on the infrared precursors were *** results show that high-temperature anomalous precursors arise mainly when the gas-free coal fails under loading,whereas the gas-bearing coal has high-temperature and low-temperature anomalous *** area of the high-temperature anomalous precursor is approximately 30%–40%under gasbearing coal unstable failure,which is lower than the 60%–70%of the gas-free *** area of the low-temperature abnormal precursor is approximately 3%–6%,which is higher than the 1%–2%of the gas-free *** increasing gas pressure,the area of the high-temperature anomalous precursor gradually decreases,and the area of the low-temperature anomalous precursor gradually *** highand low-temperature anomalous precursors of gas-bearing coal are mainly caused by gas desorption,volume expansion,and thermal *** presence of gas inhibits the increase in IRT on the coal surface and increases the difficulty of infrared radiation(IR)monitoring and early warning for gas-bearing coal.

关键词： Gas–bearing coal Gas pressure Infrared temperature Infrared thermal image Infrared precursory law

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AFM characterization of surface mechanical and electrical properties of some common rocks

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International Journal of Mining Science and Technology 2022年第2期32卷 435-445页

作者： Xianghui Tian Xueqiu He Dazhao Song Zhenlei Li Majid Khan Huifang Liu liming qiu School of Civil and Resource 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 National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China

The characterization of micro-surface mechanical and electrical properties of the natural rock materials remains inadequate,and their macroscopic performance can be better comprehended by investigating the surface *** this purpose,the present research focuses on characterizing the microsurface morphology,Derjaguin-Muller-Toporov(DMT)modulus,adhesion,and potential of granite,shale,and limestone by employing the atomic force microscope(AFM)as a pioneer *** results show that the micro-surface morphology of the rock fluctuates within hundreds of nanometers,among which the granite micro-surface is comparatively the smoothest,followed by *** morphology of the shale is the roughest,indicating that the regional difference of shale micro-surface is *** distribution of the adhesion on rock micro-surface is uneven;the average adhesion of eight measuring areas for shale is 23.93 n N,accounting for three times of granite and limestone,while the surface DMT modulus of shale is relatively lower than granite and *** is inferred from the obtained results that higher surface adhesion is helpful to the gas adsorption of shale,and the lower surface DMT(elastic)modulus is useful to the formation of fractures and ***,these two are the micromechanical basis of shale gas ***,introducing a method to reduce the surface adhesion will benefit the exploration of unconventional resources such as shale *** micro-surface of the three types of rocks all shows electricity,with average potential ranging from tens of millivolts to hundreds of ***,the micro-surface potential of the rocks are heterogeneous,and both positive and negative points can be *** existence and uneven distribution of micro-surface potential provide a robust physical basis for the electromagnetic radiation generated by rock fracture under *** study offers a new method for revealing the adsorption characteristics of unconven

关键词： AFM Rock Adhesion DMT modulus Surface potential

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Characteristics of electromagnetic vector field generated from rock fracturing

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第2期15卷 457-466页

作者： Menghan Wei Dazhao Song Xueqiu He Quan Lou liming qiu Zhenlei Li Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine University of Science and Technology BeijingBeijingChina School of Civil and Resources Engineering University of Science and Technology BeijingBeijingChina Zhong-An Academy of Safety Engineering BeijingChina School of Municipal and Environmental Engineering Henan University of Urban ConstructionPingdingshanChina

Rock fracturing is often accompanied by electromagnetic *** a vector field,in addition to the intensity that is widely concerned,the generated electromagnetic field also has obvious *** this end,a set of electromagnetic antennas capable of simultaneous three-axis measurement is used to monitor the electromagnetic vector field generated from rock fracturing based on Brazilian *** signal amplitude on each axis can represent the magnitude of actual magnetic flux density component on the three *** intensity and directional characteristics of electromagnetic signals received at different positions are studied using vector *** directionality of electromagnetic radiation measured using a three-axis electromagnetic antenna shows that the direction of the magnetic flux intensity generated by rock fracturing tends to be parallel to the crack surface,and the measured signal intensity is greater in a direction closer to the crack surface.

关键词： Electromagnetic radiation Directionality Vector field Rock fracturing

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Research on Dam Perspective Based on Numerical Solution

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Computer Aided Drafting,Design and Manufacturing 2005年第1期15卷 20-23页

作者： WANGZi-ru ZHOUHui-cheng liming-qiu SchoolofCivilandHydraulic DalianUniversityofTechnologyDalian116024China DepartmentofForeignLanguages DalianFisheriesUniversityDalian116023China

The numerical solution of dam toe line is solved based on the dam data and topographic map of dam located. The display of dam perspective is also realized by programming of using VC++ and OpenGL. The research results above provide the foundation of construction design, construction lofting and information inquiry, which avoids the drawbacks of only using blueprints to do the same work in the past. The method used is useful in practical engineering.

关键词： dam perspective numerical solution topographic

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Combination and superimposition of source kitchens and their effects on hydrocarbon accumulation in the hinterland of the Junggar Basin,west China

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Petroleum Science 2010年第1期7卷 59-72页

作者： Zhang Zhihuan Qin liming qiu Nansheng Zhong Ningning Zhang Zhenying Li Wei State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China Beijing Institute of Economic Management Hebei 102602 China SINOPEC International Petroleum Exploration and Production Corporation Beijing 100083 China

In the hinterland of the Junggar Basin, there are multiple depressions with multiple sets of source rocks. Therefore, the conditions of hydrocarbon sources are complex, and the geochemical characteristics and sources of hydrocarbon vary in different structural belts. The evolution of the Che- Mo palaeohigh affected the formation of hydrocarbon source kitchens and hydrocarbon migration. We studied the combination and superimposition of hydrocarbon source kitchens, using as an example the hinterland of the Junggar Basin （including the Yongjin, Zhengshacun, Moxizhuang and Luliang uplift areas）. The study was based on geochemical analyses of crude oil and fluid inclusions, and the histories of tectonic evolution and hydrocarbon generation. The results indicated that before the Paleogene there were two hydrocarbon-generating depressions： the Western Well Penl depression and the Changji depression on the south and north sides of the Che-Mo palaeohigh, respectively. The Permian source kitchen had been generating hydrocarbon continuously since Triassic and reached high maturity stage in the Cretaceous period. After Paleogene, the adjustment of the Che-Mo palaeohigh led to the subsidence of the Changji depression and the Jurassic source rocks reached mature stage and became the main source kitchens. However, the Jurassic source rocks in the Western Well Penl depression were still in a low maturity stage and did not generate oil because of the adjustment of tectonic movements. As a result, in the central and southern parts of the Junggar Basin, Jurassic source rocks generated oil, but in the Luliang uplift, the crude oil was from the Permian source rocks in the Western Well Penl depression and the Jurassic source rocks did not contribute. The crude oil in the central Zhengshacun-Moxizhuang belt was from the Permian source rocks in two depressions, and partially from the Jurassic source rocks. The crude oil in the Luliang uplift was from the source rocks of the lower Permian F

关键词： Hinterland of the Junggar Basin hydrocarbon source kitchen oil source combination and superimposition accumulation stage

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Impact frequency variation of self-excited oscillation pulsed supercritical carbon dioxide jets

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Petroleum Exploration and Development 2023年第5期50卷 1261-1268页

作者： SHEN Helian LIU Yong WEI Jianping qiu liming LI Haichao DENG Yujie State Key Laboratory Cultivation Base for Gas Geology and Gas Control Henan Polytechnic UniversityJiaozuo 454000China State Collaborative Innovation Center of Coal Work Safety and Clean-Efficiency Utilization Jiaozuo 454000China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China

In order to obtain the impact frequency of resonant coal breaking by self-excited oscillation pulsed supercritical carbon dioxide(SC-CO_(2))jet,large eddy simulation was used to analyze the formation and development process of self-excited oscillation pulsed SC-CO_(2)jet,the variation of jet impact frequency in the nozzle and the free flow field,and the variation of jet impact frequency at different positions in the jet axis and under different cavity *** test device of jet impact frequency was developed,and experiments were performed to verify the conclusions of the numerical *** results show that the frequency of the self-excited oscillation pulsed SC-CO_(2)jet is different in the nozzle and the free flow *** the nozzle,the frequency generated by the fluid disturbance is the same,and the jet frequency at the exit of the nozzle is consistent with that inside the *** the free flow field,due to the compressibility of CO_(2),the pressure,velocity and other parameters of SC-CO_(2)jets have obvious fluctuation *** feature causes the impact frequency of the self-excited oscillation pulsed SC-CO_(2)jet to decrease gradually in the *** the cavity length allows the adjustment of the jet impact frequency in the free flow field by affecting the disturbance frequency of the self-excited oscillation pulsed SC-CO_(2)jet inside the nozzle.

关键词： self-excited oscillation plused SC-CO_(2)jet resonant coal-breaking jet impact frequency cavity length

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西部地区国有企业激励机制构建研究

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改革与战略 2015年第9期31卷 32-35页

作者：邱黎明四川工程职业技术学院四川德阳618000

深入贯彻落实党的西部大开发战略要求我们必须重视国有企业改革,而构建行之有效的激励机制是实现国有企业改革的重要途径之一,也是关键的环节。文章立足于经济学视角,对当前西部地区国有企业激励机制难以充分发挥其自身作用的原因进行... 详细信息

深入贯彻落实党的西部大开发战略要求我们必须重视国有企业改革,而构建行之有效的激励机制是实现国有企业改革的重要途径之一,也是关键的环节。文章立足于经济学视角,对当前西部地区国有企业激励机制难以充分发挥其自身作用的原因进行了深入分析,并提出西部国有企业一定要及时更新观念,创新激励制度,提高现代化企业管理水平等建议。

关键词：西部地区国有企业激励机制

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冲击倾向性煤不同损伤程度声发射分形特征研究

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煤炭科学技术 2021年第9期49卷 38-46页

作者：郭海峰宋大钊何学秋娄全邱黎明北京科技大学土木与资源工程学院北京100083 School of Civil Mining and Environmental EngineeringUniversity of WollongongWollongong NSW 2522Australia 中安安全工程研究院北京100083 河南城建学院市政与环境工程学院河南平顶山467036

为研究冲击倾向性煤单轴压缩过程中不同损伤程度声发射分形特征,对冲击倾向性煤进行了单轴压缩试验,基于声发射振铃次数损伤模型和声发射参数时间序列分形维数计算模型,对煤样破坏过程中的损伤演化和不同损伤程度分形维数进行了研究。... 详细信息

为研究冲击倾向性煤单轴压缩过程中不同损伤程度声发射分形特征,对冲击倾向性煤进行了单轴压缩试验,基于声发射振铃次数损伤模型和声发射参数时间序列分形维数计算模型,对煤样破坏过程中的损伤演化和不同损伤程度分形维数进行了研究。研究表明:煤样有大破裂产生时,声发射会出现阶段性增高的现象,较大振铃次数的产生是裂纹扩展、集聚过程中能量释放的结果,冲击煤声发射活动频发大都发生在应力应变全过程的后期;煤样的损伤应变过程可分为3个阶段:初始损伤阶段,损伤演化阶段、损伤持续增长阶段,各阶段的声发射振铃次数占比分别为1.61%、14.83%、83.56%,冲击煤损伤持续增长阶段的时间占比少,但声发射振铃多。随着煤样损伤程度的增加,声发射分形维数先增大,当煤样损伤程度达到30%后突然下降,然后保持波动上升,在煤样损伤程度达到80%时,达到局部峰值后,发生突降,整体变化趋势呈现倾斜的“M”型。分形维数达到峰值后发生突降的现象可作为煤样失稳破坏的前兆信息。

关键词：冲击倾向性振铃次数损伤程度声发射分形维数

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