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Coalbursts in China: Theory, practice and management

Journal of Rock Mechanics and Geotechnical Engineering 2024年第1期16卷 1-25页

作者： Yishan Pan yimin Song Hao luo Yonghui Xiao Institute of Disaster Rock Mechanics Liaoning UniversityShenyang110036China School of Civil Engineering North China University of TechnologyBeijing100144China College of Computer Science Liaoning UniversityShenyang110036China School of Physics Liaoning UniversityShenyang110036China

Coalburst is one of the most serious disasters that threaten the safe production of coal mines, and this disaster is particularly serious in China. This paper presents an overview of coalbursts in China since 1980s. From the "stress and energy" and "regional and local" perspectives, the achievements in the theory, practice and management of coalbursts in China are systematically summarized. A theoretical system of coalbursts has been formed to reveal the deformational behavior of coalbursts and explain the mechanism of coalbursts. The occurrence conditions of coalbursts are put forward and the critical stress is obtained. The stress index method for risk evaluation of coalbursts before mining is proposed, and the deformation localization prediction method of coalbursts is put forward. The relationship between energy release and absorption in the process of coalbursts is found, and the prevention and control methods of coalbursts, including the regional method, the local method and support, are presented. The safety evaluation index of coalburst prevention and control is put forward. The integrated prevention and control method for coal and gas outbursts is proposed. The prevention and control technology and equipment of coalbursts have also been developed. Amongst them, the distribution law of the critical stress in China coalburst mines is discovered. The technology and equipment for monitoring, prevention and control of coalbursts, as well as for integrated prevention and control of combined coalbursts and other disasters, have been developed. The energy-absorbing and coalburst-preventing support technology for roadways is invented, and key engineering parameters of coalburst prevention and control are pointed out. In China, coalburst prevention and control laws and standards have been developed. Technical standards for coalbursts are formulated, statute and regulations for coal mines are established, and regulatory documents are promoted.

关键词： Coalbursts Rockbursts Dynamic disaster Energy-absorbing support Monitoring and early warning

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Enhancing the electrocatalytic performance of nitrate reduction to ammonia by in-situ nitrogen leaching

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Chinese Chemical Letters 2024年第2期35卷 564-569页

作者： Mimi Fu Yini Mao Hua Wang Wei luo yimin Jiang Wei Shen Ming Li Rongxing He College of Chemistry and Chemical Engineering Southwest UniversityChongqing 400715China

Electrochemical nitrate reduction reaction (NITRR) is regarded as a “two birds-one stone” method for the treatment of nitrate contaminant in polluted water and the synthesis of valuable ammonia, which is retarded by the lack of highly reactive and selective electrocatalysts .Herein, for the first time, nickel foam supported Co_(4) N was designed as a high-performance NITRR catalyst by an in-situ nonmetal leaching-induced strategy.At the optimal potential, the Co_(4) N/NF catalyst achieves ultra-high Faraday efficiency and NH_(3) selectivity of 95.4% and 99.4%, respectively.Ex situ X-ray absorption spectroscopy (XAS), together with other experiments powerfully reveal that the nitrogen vacancies produced by nitrogen leaching are stable and play a key role in boosting nitrate reduction to ammonia.Theoretical calculations confirm that Co_(4) N with abundant nitrogen vacancies can optimize the adsorption energies of NO_(3)^(-) and intermediates, lower the free energy (Δ G ) of the potential-determining step (*NH_(3) to NH_(3) ) and inhibit the formation of N-containing byproducts.In addition, we also conclude that the nitrogen vacancies can stabilize the adsorbed hydrogen, making H_(2) quite difficult to produce, and lowering ΔG from *NO to *NOH, which facilitates the selective reduction of nitrate.This study reveals significant insights about the in-situ nonmetal leaching to enhance the NITRR activity.

关键词： Co4N Nitrate reduction In-situ nonmetal leaching Nitrogen vacancy Mechanism

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Mechanism of thermoviscoelasticity driven solid-liquid interface reducing friction for polymer alloy coating

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Friction 2023年第9期11卷 1606-1623页

作者： Sheng TAN yimin luo Junhua YANG Wei WANG Xia LI Baoguang JIA Zhuangzhu luo Guangan ZHANG School of Materials Sun Yat-sen UniversityShenzhen 518107China The 14th Research Institute of China Electronics Technology Group Corporation Nanjing 210039China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

High-temperature ablation is a common failure phenomenon that limits the service life of the transmission parts on heavy-duty machines used in heavy load,high temperature,high shock conditions due to in-sufficient supply of lubricating oil and grease.Traditional self-lubricating coatings prepared by inorganic,organic or organic-inorganic hybrid methods are prone to be oxidated at high temperatures to lose their friction reducing function,so that it is difficult to meet the engineering requirements of high-temperature lubrication.We design viscoelastic polymer coatings by a high-temperature self-lubricating and wear-resistant strategy.Polytetrafluoroethylene(PTFE,T_(m)=329℃)and polyphenylene sulfide(PPS,T_(g)=84℃,T_(m)=283℃)are used to prepare a PTFE/PPS polymer alloy coating.As the temperature increases from 25 to 300℃,the PTFE/PPS coating softens from glass state to viscoelastic state and viscous flow state,which is owing to the thermodynamic transformation characteristic of the PPS component.Additionally the friction coefficient(μ)decreased from 0.096 to 0.042 with the increasing of temperature from 25 to 300℃.The mechanism of mechanical deformation and surface morphology evolution for the PTFE/PPS coating under the multi-field coupling action of temperature(T),temperature–centrifugal force(T–F_(ω)),temperature–centrifugal force–shearing force(T–F_(ω)–F_(τ))were investigated.The physical model of“thermoviscoelasticity driven solid–liquid interface reducing friction”is proposed to clarify the self-lubricating mechanism determined by the high-temperature viscoelastic properties of polymers.The high-temperature adjusts the viscosity(η)of the coating,increases interface slipping and intensifies shear deformation(τ),reducing the friction coefficient.The result is expected to provide a new idea for designing anti-ablation coatings served in high temperature friction and wear conditions.

关键词： self-lubricating polymer coating viscoelastic state solid-liquid interface friction reduction hightemperature tribology

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代谢功能障碍相关脂肪性肝病新药临床试验现状和挑战

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中华肝脏病杂志 2024年第4期32卷 300-302页

作者：罗听陆伦根茅益民上海交通大学医学院附属第一人民医院消化内科上海200080 上海交通大学医学院附属仁济医院消化内科上海200001

代谢功能障碍相关脂肪性肝病(MASLD)是巨大的公共卫生问题,严重影响人类的健康,目前针对MASLD新药研发取得了一些不错的进展,但仍有极大的探索空间。现总结目前针对MASLD新药研发的临床现状与面临的挑战,并对原因进行分析。

关键词：脂肪肝代谢功能障碍相关脂肪性肝病药物靶点临床试验研究进展

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基于ADI格式的多尺度图像分解

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数学物理学报（A辑） 2024年第1期44卷 160-172页

作者：罗肖义韩欢张贻民武汉理工大学数学科学研究中心武汉430070 武汉理工大学数学系武汉430070

针对文献[Xu R et al.,IEEE Trans.Biomed.Eng.,2014]的多尺度图像分解模型,该文提出了Alternating Direction Implicit (ADI)格式下的多尺度图像分解算法,并证明了在该模型下ADI格式的收敛性和稳定性,进一步,通过对不同图像的数值实验... 详细信息

针对文献[Xu R et al.,IEEE Trans.Biomed.Eng.,2014]的多尺度图像分解模型,该文提出了Alternating Direction Implicit (ADI)格式下的多尺度图像分解算法,并证明了在该模型下ADI格式的收敛性和稳定性,进一步,通过对不同图像的数值实验,验证了该文提出的算法具有更好的纹理提取效果.

关键词：变分模型图像分解 ADI 多尺度

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莎士比亚的文学价值

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广东外语外贸大学学报 2024年第2期35卷 22-39页

作者：罗益民西南大学外国语学院

莎士比亚有众多的身份,比如剧作家、诗人、演员等,但作为文学家的身份是他的一个基本而重要的一面。就他的戏剧而言,他究竟有什么样的文学价值,一直是学界不曾系统探讨的一个话题。莎士比亚作为文学家的价值是文学在历史的积淀中体现出... 详细信息

莎士比亚有众多的身份,比如剧作家、诗人、演员等,但作为文学家的身份是他的一个基本而重要的一面。就他的戏剧而言,他究竟有什么样的文学价值,一直是学界不曾系统探讨的一个话题。莎士比亚作为文学家的价值是文学在历史的积淀中体现出来的,因为除他的诗歌以外,他的戏剧作品也具有文学性。这些主要体现在:(1)多姿多彩的文体;(2)丰富无比的主题;(3)超级大的词汇量和语言表现力;(4)精彩纷呈、令人难忘的艺术形象;(5)高山仰止的思想深度和智慧高度。这些因素构成了莎士比亚伟大的文学艺术大厦及其恒久的艺术魅力与价值。

关键词：莎士比亚文学价值

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絮凝沉淀与生物曝气滤池结合处理杨木心材生物化学机械法制浆废水

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中国造纸学报 2024年第1期39卷 38-46页

作者：牛虎军谢益民罗文琪周安乡薛超湖北工业大学制浆造纸研究院湖北武汉430068 湖北工业大学绿色轻工材料湖北省重点实验室湖北武汉430068 湖北华海纤维科技股份有限公司湖北南漳441500

本研究利用白腐菌Trametes sp.48424预处理杨木心材,结合絮凝沉淀与生物曝气滤池(BAF),处理化学机械法制浆过程中产生的综合废水,研究废水回用对生物化学机械法制浆及BAF的影响,探究处理后废水回用的可行性。结果表明,采用白腐菌预处理... 详细信息

本研究利用白腐菌Trametes sp.48424预处理杨木心材,结合絮凝沉淀与生物曝气滤池(BAF),处理化学机械法制浆过程中产生的综合废水,研究废水回用对生物化学机械法制浆及BAF的影响,探究处理后废水回用的可行性。结果表明,采用白腐菌预处理技术,能够抵消添加2%(相对于原料绝干质量)的NaOH所产生的CODCr。絮凝沉淀处理后,CODCr的最高去除率为49.9%。BAF处理后COD_(Cr)最高去除率可达91.8%,出水CODCr浓度降至39.8 mg/L,达到制浆废水回用和排放的标准。废水回用会降低BAF的整体效率,且处理后的废水回用于制浆系统,对浆料的成纸性能也会产生一定的影响;回用1次后出水CODCr浓度升至76.3 mg/L,故处理后的废水只能回用1次。

关键词：白腐菌生物化学机械浆絮凝沉淀法生物曝气滤池废水回用

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互联网时代电商产业集群空间集聚机制研究——以江苏省睢宁县沙集镇为例

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上海城市规划 2024年第1期174卷 80-88页

作者：杨易旻罗震东袁超君南京大学建筑与城市规划学院南京大学空间规划研究中心

互联网时代生产方式的转型改变了以地理邻近为核心的传统产业区位理论,电商产业集群作为实体集聚和虚拟集聚双重作用的产物,同时受到实体空间重构和数字经济转型的深刻影响。以江苏省睢宁县沙集家具电商产业集群为例,一方面规模报酬递... 详细信息

互联网时代生产方式的转型改变了以地理邻近为核心的传统产业区位理论,电商产业集群作为实体集聚和虚拟集聚双重作用的产物,同时受到实体空间重构和数字经济转型的深刻影响。以江苏省睢宁县沙集家具电商产业集群为例,一方面规模报酬递增的放大强化了实体集聚和虚拟集聚的双重集聚,加强了制造业和物流业的规模化、专业化发展;另一方面,交易成本的降低推动了产业在更大区域实现分工,当集群内高端生产服务环节向大城市集聚,简单加工与配套环节向下一级乡镇转移后,与其竞争优势相匹配的核心业务则进一步在地强化,并持续发生空间集聚。

关键词：互联网电商产业集群空间集聚交易成本沙集镇

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Fabrication of green one-part geopolymer from silica-rich vanadium tailing via thermal activation and modification

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International Journal of Minerals,Metallurgy and Materials 2022年第1期29卷 177-184页

作者： Shenxu Bao Yongpeng luo yimin Zhang Hubei Key Laboratory of Mineral Resources Processing and Environment Wuhan University of TechnologyWuhan 430070China School of Resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Wuhan University of Science and TechnologyWuhan 430081China Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources Wuhan University of Science and TechnologyWuhan 430081China

The aim of this investigation was to prepare geopolymeric precursor from vanadium tailing(VT)by thermal activation and modification.For activation,a homogeneous blend of VT and sodium hydroxide was calcinated at an elevated temperature and then modified with metakaolin to produce a geopolymeric precursor.During the thermal activation,the VT was corroded by sodium hydroxide and then sodium silicate formed on the particle surfaces.After water was added,the sodium silicate coating dissolved to release silicon species,which created an alkaline solution environment.The metakaolin then dissolved in the alkaline environment to generate aluminum species,which was followed by geopolymerization.The VT particles were connected by a gel produced during geopolymerization,which yielded a geopolymer with excellent mechanical performance.This investigation not only improves the feasibility of using geopolymer technology for large-scale and in-situ applications,but also promotes the utilization of VT and other silica-rich solid wastes.

关键词： vanadium tailing thermal activation geopolymeric precursor compressive strength leaching behavior

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Distributed game strategy for unmanned aerial vehicle formation with external disturbances and obstacles

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Frontiers of Information Technology & Electronic Engineering 2022年第7期23卷 1020-1031页

作者： Yang YUAN yimin DENG Sida luo Haibin DUAN State Key Laboratory of Virtual Reality Technology and Systems School of Autonomous Science and Electrical EngineeringBeihang UniversityBeijing 100083China School of Mechanical Engineering&Automation Beihang UniversityBeijing 100191China Peng Cheng Laboratory Shenzhen 518000China

We investigate a distributed game strategy for unmanned aerial vehicle(UAV)formations with external disturbances and obstacles.The strategy is based on a distributed model predictive control(MPC)framework and Levy flight based pigeon inspired optimization(LFPIO).First,we propose a non-singular fast terminal sliding mode observer(NFTSMO)to estimate the influence of a disturbance,and prove that the observer converges in fixed time using a Lyapunov function.Second,we design an obstacle avoidance strategy based on topology reconstruction,by which the UAV can save energy and safely pass obstacles.Third,we establish a distributed MPC framework where each UAV exchanges messages only with its neighbors.Further,the cost function of each UAV is designed,by which the UAV formation problem is transformed into a game problem.Finally,we develop LFPIO and use it to solve the Nash equilibrium.Numerical simulations are conducted,and the efficiency of LFPIO based distributed MPC is verified through comparative simulations.

关键词： Distributed game strategy Unmanned aerial vehicle(UAV) Distributed model predictive control(MPC) Levy flight based pigeon inspired optimization(LFPIO) Non-singular fast terminal sliding mode observer(NFTSMO) Obstacle avoidance strategy

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