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Mechanism investigation on coal and gas outburst: An overview

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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The reservoir characteristics and their controlling factors of the sublacustrine fan in the Paleogene Dongying Formation, Bohai Sea,China

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Journal of Palaeogeography 2024年第1期13卷 127-148页

作者： Xiao-jun Pang Guan-Min Wang meng Zhao qing-Bin Wang Xue-Fang Zhang School of Geosciences China University of Petroleum(East China)QingdaoShandong 266580China Tianjin Branch of China National Offshore Oil Corporation Limited Tianjin 300459China

Sublacustrine fan is an important element in continental lacustrine basins and is significant for reservoir exploration. Oil and gas resources have been found in the sublacustrine fan sandstone reservoirs of the Paleogene Dongying Formation in the Bohai Sea. In this study, the characteristics of the sublacustrine fan reservoirs and the controlling factors are studied using information from logging, cores, physical properties,casting thin sections, X-ray diffraction of clay minerals, vitrinite reflectance, rock pyrolysis, manometry data,and 3D seismic data. The sublacustrine fans of the Dongying Formation in the LD10, QHD34, and BZ21 structures show high-quality reservoirs with porosity >15 % and permeability >5 m D. The main controlling factors of the high-quality reservoirs are attributed to the favorable sedimentary facies type and negligible compaction,and cementation, substantial dissolution of K-feldspar, overpressure, and the development of faults and fractures. A high-quality sublacustrine fan reservoir model has been established to explain how these factors affected the physical properties. The favorable targets for oil and gas exploration in the Dongying Formation of Bohai Sea include undercompacted sandy debris flow reservoirs showing the dissolution of K-feldspar, and the reservoirs which are connected to the source rocks by faults. This study provides insights to establish the relationship between sedimentology, diagenesis and reservoir quality. The results of this study are significant for the exploration and development of the sublacustrine fan sandstone reservoirs in the Bohai Sea and analogous sandstone reservoirs elsewhere.

关键词： Sublacustrine fan High-quality reservoir Dissolution Overpressure Fault Bohai Sea

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Dielectric and energy storage properties of PbO–SrO–Nb_(2)O_(5)–Na_(2)O–Si thin films by annealing

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Rare Metals 2024年第1期43卷 351-355页

作者： Fei-Hu Tan qing-meng Zhang Feng Wei Hong-Bin Zhao Xiao Zhang jun Du State Key Laboratory of Advanced Materials for Smart Sensing General Research Institute for Nonferrous MetalsBeijing 100088China Advanced Electronic Materials Institute General Research Institute for Nonferrous MetalsBeijing 100088China

Dielectric and energy storage properties of PbOSrO-Na_(2)O-Nb_(2)O_(5)-SiO_(2)(PSNNS) thin films with annealing temperature from 700 to 850 ℃ were investigated by measuring their capacitance-electric filed curve and hysteresis *** results show that the highest dielectric constant and energy density are 81.2 and 17.0 J·cm^(-3),respectively,which is obtained in the sample with annealing temperature of 800 ℃.Annealed from 700 to800 ℃,the dielectric constant and energy storage performance of PSNNS films are continuously ***,with annealing temperature up to 850 ℃,their dielectric constant decreases,which might be related with the removal of interfacial defects as a function of annealing *** is one of the causes of space charge phenomenon,resulting in the increase in dielectric ***,the micro structure analysis by X-ray diffraction(XRD) and transmission electron microscope(TEM) indicates that the change of crystallization phase and interfacial polarization takes responsibility to the results.

关键词： Thin film Pulse laser deposition Annealing temperature Energy storage density

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NLRP3-mediated autophagy dysfunction links gut microbiota dysbiosis to tau pathology in chronic sleep deprivation

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Zoological Research 2024年第4期45卷 857-874页

作者： Na Zhao Xiu Chen Qiu-Gu Chen Xue-Ting Liu Fan Geng meng-meng Zhu Fu-Ling Yan Zhi-jun Zhang qing-Guo Ren Department of Neurology School of MedicineSoutheast UniversityNanjingJiangsu 210009China Department of Neurology Affiliated Zhongda HospitalSoutheast UniversityNanjingJiangsu 210009China

Emerging evidence indicates that sleep deprivation(SD)can lead to Alzheimer’s disease(AD)-related pathological changes and cognitive ***,the underlying mechanisms remain *** the present study,we identified the existence of a microbiota-gut-brain axis in cognitive deficits resulting from chronic SD and revealed a potential pathway by which gut microbiota affects cognitive functioning in chronic *** findings demonstrated that chronic SD in mice not only led to cognitive decline but also induced gut microbiota dysbiosis,elevated NLRP3 inflammasome expression,GSK-3βactivation,autophagy dysfunction,and tau hyperphosphorylation in the *** with the“SD microbiota”replicated the pathological and behavioral abnormalities observed in chronic sleep-deprived ***,both the deletion of NLRP3 in NLRP3-/-mice and specific knockdown of NLRP3 in the hippocampus restored autophagic flux,suppressed tau hyperphosphorylation,and ameliorated cognitive deficits induced by chronic SD,while GSK-3βactivity was not regulated by the NLRP3 inflammasome in chronic ***,deletion of NLRP3 reversed NLRP3 inflammasome activation,autophagy deficits,and tau hyperphosphorylation induced by GSK-3βactivation in primary hippocampal neurons,suggesting that GSK-3β,as a regulator of NLRP3-mediated autophagy dysfunction,plays a significant role in promoting tau ***,gut microbiota dysbiosis was identified as a contributor to chronic SD-induced tau pathology via NLRP3-mediated autophagy dysfunction,ultimately leading to cognitive ***,these findings highlight GSK-3βas a regulator of NLRP3-mediated autophagy dysfunction,playing a critical role in promoting tau hyperphosphorylation.

关键词： Chronic sleep deprivation Tau pathology NLRP3 inflammasome Autophagy GSK-3β Microbiota-gut-brain axis

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Reducing Operation Emissions and Improving Work Efficiency Using a Pure Electric Wheel Drive Tractor

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Engineering 2024年第6期37卷 230-245页

作者： Chang-Kai Wen Wen Ren qing-Zhen Zhu Chun-Jiang Zhao Zhen-Hao Luo Sheng-Li Zhang Bin Xie Zhi-jun meng Research Center of Intelligent Equipment Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China State Key Laboratory of Intelligent Agricultural Power Equipment Beijing 100097China BYD Company Limited Shenzhen 518118China College of Agricultural Engineering Jiangsu UniversityZhenjiang 212013China College of Engineering China Agricultural UniversityBeijing 100083China

In response to the problems of excessive greenhouse-gas and particulate emissions and the low traction efficiency of conventional diesel tractors in the field,a purely electric wheel-side drive tractor was studied,including an electric motor drive system,a battery ballast system,and an electro–hydraulic suspension *** paper develops a dynamics model of an electric tractor-ploughing unit under complex soil conditions,leading to the proposal of an active control method for drive wheel torque and a joint control method for the traction force of the suspension system and the front-and rear-axle loads of a ***,the tractor is prototyped and assembled,and ploughing tests are carried *** ploughing results show that the active torque-distribution control method proposed in this study reduces the tractor slip by 14.83%and increases the traction efficiency by 10.28%compared with the average torquedistribution *** with the conventional traction control mode,the joint control method for traction and ballast proposed in this paper results in a 3.7%increase in traction efficiency,a 15.05%decrease in slip,and a 4.9%reduction in total drive motor energy *** study will help to improve the operation quality and traction efficiency of electric tractors in complex soil conditions.

关键词： Electric tractor Ploughing unit Torque distribution Active ballast Traction performance

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Iron oxide/CNT-based artificial nacre for electromagnetic interference shielding

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Nano Research 2024年第7期17卷 6560-6566页

作者： Cheng-Xin Yu Yu-Feng meng Bo Yang jun Pang Xiang-Sen meng Zi-Ye Zhao qing-Yue Wang Li-Bo Mao Zhi-Kun Wu Shu-Hong Yu Institute of Physical Science and Information Technology Anhui UniversityHefei 230601China Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and NanotechnologyCAS Center for Excellence in NanoscienceInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China Department of Chemistry New Cornerstone Science LaboratoryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China

Biological structural materials,despite consisting of limited kinds of compounds,display multifunctionalities due to their complex hierarchical *** some biomimetic strategies have been applied in artificial materials to enhance their mechanical stability,the simultaneous optimization of other functions along with the mechanical properties via biomimetic designs has not been thoroughly ***,iron oxide/carbon nanotube(CNT)-based artificial nacre with both improved mechanical and electromagnetic interference(EMI)shielding performance is fabricated via the mineralization of Fe_(3)O_(4)onto a CNTincorporated *** micro-and nano-structures of the artificial nacre are similar to those of natural nacre,which in turn improves its mechanical *** alternating electromagnetic wave-reflective CNT layers and the wave-absorptive iron oxide layers can improve the multiple reflections of the waves on the surfaces of the reflection layers,which then allows sufficient interactions between the waves and the absorption ***,compared with the reflection-dependent EMI-shielding of the non-structured material,the artificial nacre exhibits strong absorption-dependent shielding behavior even with a very low content of wave-absorptive *** to the high mechanical stability,the shielding effectiveness of the artificial nacre that deeply cut by a blade is still maintained at approximately 70%−96%depending on the incident wave *** present work provides a new way for designing structural materials with concurrently enhanced mechanical and functional properties,and a path to combine structural design and intrinsic properties of specific materials via a biomimetic strategy.

关键词： artificial nacre electromagnetic interference shielding biomineralization biomimetic material hierarchical structure

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Integral precession calibration method of PIGA on linear vibration table

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Chinese Journal of Aeronautics 2024年第3期37卷 219-236页

作者： Chuang SUN Shun-qing REN jun-wei CAO Ru HUO Department of Automation Tsinghua UniversityBeijing 100084China School of Astronautics Harbin Institute of TechnologyHarbin 150001China Beijing National Research Center for Information Science and Technology Tsinghua UniversityBeijing 100084China Faculty of Information technology Beijing University of TechnologyBeijing 100124China

Linear vibration table can provide harmonic accelerations to excite the nonlinear error terms of Pendulous Integrating Gyro Accelerometer(PIGA).Integral precession calibration method is proposed to calibrate PIGA on a linear vibration table in this *** on the precise expressions of PIGA’s inputs,the error calibration model of PIGA is *** angular velocity errors of PIGA are suppressed by integer periodic precession and the errors caused by non-integer periods vibrating are *** complete calibration process,including planning,preparation,PIGA testing,and coefficient identification,is designed to optimize the test operations and evaluate the calibration *** effect of the main errors on calibration uncertainty is analyzed and the relative sensitivity function is proposed to further optimize the test *** and simulation results verify that the proposed 10-position calibration method can improve calibration uncertainties after compensating for the related *** order of calibration uncertainties of the second-and third-order coefficients are decreased to 10^(-8)(rad.s^(-1))/g^(2)and 10^(-8)(rad.s^(-1))/g3,*** with the other two classical calibration methods,the calibration uncertainties of PIGA’s nonlinear error coefficients can be effectively reduced and the proportional residual errors are decreased less than 3×10-6(rad.s^(-1))/g by using the proposed calibration method.

关键词： PIGA Linear vibration table Vibration measurement Calibration Error analysis Uncertainty analysis

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和平、民主、面包与俄共(布)公信力的形成

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湖南师范大学社会科学学报 2012年第2期41卷 55-63页

作者：吴家庆卿孟军湖南师范大学公共管理学院

第一次世界大战使俄国经济濒临崩溃,广大人民群众生活水平迅速下降,工人、农民和士兵提出了"和平、土地、面包"的要求。布尔什维克的反战政策赢得了人民群众的信任。十月革命胜利后,苏俄退出帝国主义战争,为人民群众争得了宝贵的和平喘... 详细信息

第一次世界大战使俄国经济濒临崩溃,广大人民群众生活水平迅速下降,工人、农民和士兵提出了"和平、土地、面包"的要求。布尔什维克的反战政策赢得了人民群众的信任。十月革命胜利后,苏俄退出帝国主义战争,为人民群众争得了宝贵的和平喘息时机;苏维埃政权实行工人监督,把土地无偿交给农民使用,保障了人民当家做主的权利;新经济政策以粮食税代替余粮征集制,调动了农民的生产积极性,满足了农民的面包要求;文化革命坚持唯物主义,巩固了马克思主义在俄国的指导地位。

关键词：俄共(布) 公信力和平民主面包

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和平、战争与斯大林时期苏共公信力的提升

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湖南师范大学社会科学学报 2011年第6期40卷 37-45页

作者：吴家庆卿孟军湖南师范大学公共管理学院湖南长沙410081

苏联卫国战争爆发之前,苏联对外政策遵循两种社会制度国家和平共处原则,加强与西方国家的经济交往,既促进了苏联社会主义工业化,又维护了世界和平。苏联卫国战争爆发后,苏联党和政府鼓舞和组织广大人民群众参加反法西斯战争,主导世界反... 详细信息

苏联卫国战争爆发之前,苏联对外政策遵循两种社会制度国家和平共处原则,加强与西方国家的经济交往,既促进了苏联社会主义工业化,又维护了世界和平。苏联卫国战争爆发后,苏联党和政府鼓舞和组织广大人民群众参加反法西斯战争,主导世界反法西斯统一战线的形成,为世界反法西斯战争的胜利做出了巨大的贡献。苏联卫国战争胜利后,苏联对外政策忠于社会主义国际主义原则,维护了欧亚人民民主国家的利益,为保卫世界和平与民主做出了新的贡献。苏联在和平与战争问题上的正确立场,使苏维埃政权经历了伟大卫国战争的严峻考验,苏共公信力也因此得到进一步的提升。

关键词：斯大林时期苏共公信力和平战争

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Antibacterial Activity of Plants in Cirsium:A Comprehensive Review

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Chinese Journal of Integrative Medicine 2024年第9期30卷 835-841页

作者： TANG Xiao-meng XIE Ming-xia GOU jun-li CHEN Liang TIAN Jin-long ZHANG Xia LU You-yuan WANG Han-qing College of Pharmacy Ningxia Medical UniversityYinchuanNingxia750004China College of Traditional Chinese Medicine Hunan University of Chinese MedicineChangsha410007China General Hospital of Ningxia Medical University YinchuanNingxia750004China Ningxia Regional Characteristic Traditional Chinese Medicine Collaborative Innovation Center Co-constructed by the Province and Ministry Ningxia Engineering and Technology Research Center for Modernization of Regional Characteristic Traditional Chinese MedicineNingxia Medical UniversityYinchuan750004China Key Laboratory of Ningxia Minority Medicine Modernization Ministry of EducationYinchuan750004China

As ethnic medicine,the whole grass of plants in Cirsium was used as *** review focuses on the antimicrobial activity of plants in Cirsium,including antimicrobial components,against different types of microbes and bacteriostatic *** results showed that the main antimicrobial activity components in Cirsium plants were flavonoids,triterpenoids and phenolic acids,and the antimicrobial ability varied according to the species and the content of *** them,phenolic acids showed a strong antibacterial ability against Acinetobacter baumannii,Pseudomonas aeruginosa,and Enterococcus *** antibacterial mechanisms include:(1)damaging the cell membrane,cell walls,mitochondria and nucleus of bacteria;(2)inhibiting the synthesis of proteins and nucleic acids;(3)suppressing the synthesis of enzymes for tricarboxylic acid cycle pathways and glycolysis,and then killing the bacteria via inhibition of energy ***,most research results on antimicrobial activity of Cirsium plants are reported based on in vitro *** evidence from clinical data and comprehensive evaluation are needed.

关键词： Cirsium traditional use antibacterial active components bacteriostatic activity bacteriostatic mechanism Chinese medicine

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