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Rockburst mechanism and the law of energy accumulation and release in mining roadway: a case study

International Journal of Coal Science & Technology 2022年第5期9卷 96-112页

作者： Feng Du Ji Ma Xiaofei Guo Tianfeng Wang Xiaohang Dong Jiashuo Li shulei he Dilinaer Nuerjuma Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources China University of Mining and Technology(Beijing)100083 BeijingChina State and Local Joint Engineering Laboratory for Gas Drainage&Ground Control of Deep Mines Henan Polytechnic University454003 JiaozuoHenanChina School of Safety Science and Engineering Henan Polytechnic University454003 JiaozuoHenanChina

The rockburst dynamic disasters in the process of deep coal mining become more and more *** the rockburst occurred in the 23130 working face of Yuejin Coal Mine as the engineering background,we study the characteristics of mining stress feld around roadway,the plastic failure morphological characteristics of surrounding rock and the accumulation/release law of elastic energy before and after *** analysis model quantitatively describing the physical process of rockburst in the mining roadway is established,and the calculation method of dynamic release of elastic energy in the physical process of rockburst is *** mechanism of rockburst in mining roadway is *** results show that an“L-shaped”stress concentration zone is formed within 100 m of the 23130 working face,and the principal stress ratio of the surrounding rock of the transportation roadway is 2.59–*** change of the direction of the maximum principal stress has a signifcant efect on the burst appearance *** failure strength of diferent sections of the mining roadway is characterized by the elastic energy release *** the increase of the working face distance,the elastic energy released by burst failure and the expansion variation of failure boundary radius show a nonlinear variation law that tends to decrease steadily after sharp *** closer to the working face,the higher the burst *** a distance of 10 m from the working surface,the maximum principal stress reaches its maximum *** butterfy-shaped failure system generated by the surrounding rock of the roadway has energy self-sustainability,and the elastic energy released by the sudden expansion of the butterfy leaf is enough to cause a burst damage of 1.9 *** work could provide theoretical support for the prediction and prevention of rockburst.

关键词： Coal Rockburst Mining roadway Plastic failure Dynamic and static load Elastic energy

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太行山坡地植物篱种植对土壤水肥的短期影响

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环境工程技术学报 2024年第5期14卷 1467-1478页

作者：高飞陈艳梅高吉喜郭文芳刘倩愿李鑫贺舒蕾王佳乐河北师范大学地理科学学院河北省环境变化遥感识别技术创新中心河北省环境演变与生态建设重点实验室生态环境部卫星环境应用中心北京林业大学林学院

为探讨生物措施对人工林坡地土壤环境改善效果,在太行山东麓典型坡地布设枸杞、欧李、连翘、金银花、薄荷5种植物篱,并以平行位置的空白裸地为对照,分析不同植物篱及篱带位置对表层土壤水肥的影响。结果表明:1)与土壤水分相关指标中,不... 详细信息

为探讨生物措施对人工林坡地土壤环境改善效果,在太行山东麓典型坡地布设枸杞、欧李、连翘、金银花、薄荷5种植物篱,并以平行位置的空白裸地为对照,分析不同植物篱及篱带位置对表层土壤水肥的影响。结果表明:1)与土壤水分相关指标中,不同植物篱带上、带中位置土壤自然含水量较空白对照提高了14.55%~62.69%,土壤总孔隙度基本高于空白对照,且不同植物篱间差异显著(P薄荷(1.677)>欧李(1.670)>枸杞(1.655)>连翘(1.643)>空白对照(1.527)。5种植物篱短期内均有保持土壤水分和调节土壤肥力能力,其中金银花土壤水肥调节效果最好,可用于修复水土流失较严重的太行山坡地。

关键词：植物篱土壤水肥灰色关联度短期影响太行山

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Several miRNAs derived from serum extracellular vesicles are potential biomarkers for early diagnosis and progression of Parkinson’s disease

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Translational Neurodegeneration 2021年第3期10卷 331-342页

作者： shulei he Lu Huang Ci Shao Tiejian Nie Li Xia Bozhou Cui Fangfang Lu Lin Zhu Bolin Chen Qian Yang Department of Experimental Surgery Tangdu HospitalThe Fourth Military Medical UniversityXi’an 710038China Department of Neurosurgery and Institute for Functional Brain Disorders Tangdu HospitalThe Fourth Military Medical UniversityXi’an 710038China School of Computer Science Northwestern Polytechnical UniversityXi’an 710072China

Background:Blood-based test for predicting disease progression and early diagnosis of Parkinson’s disease(PD)is an unmet need in the *** profiles of microRNAs(miRNAs)are regarded as potential diagnostic biomarkers for human diseases,whereas miRNAs in the periphery are susceptible to the influence of various *** enriched in serum extracellular vesicles(EVs)have demonstrated disease-specific advantages in diagnosis due to their high abundance,stability and resistance to *** study was aimed to screen differentially expressed EV-derived miRNAs between healthy controls and PD patients to aid in diagnosis of ***:A total of 31 healthy controls and 72 patients with a diagnosis of PD at different Hoehn and Yahr stages in Tangdu Hospital were *** total,185 differentially expressed miRNAs were obtained through RNA sequencing of serum EVs as well as edgeR and t-test ***,the weighted gene co-expression network analysis(WGCNA)was utilized to identify the commonly expressed miRNAs in all stages of PD by constructing connections between modules,and specifically expressed miRNAs in each stage of PD by functional enrichment *** aligning these miRNAs with PD-related miRNAs in Human miRNA Disease Database,the screened miRNAs were further validated by receiver operating characteristic(ROC)curves and quantitative real-time polymerase chain reaction(qRT-PCR)using peripheral blood EVs from 40 more ***:WGCNA showed that 4 miRNAs were commonly associated with all stages of PD and 13 miRNAs were specifically associated with different stages of *** the 17 obtained miRNAs,7 were validated by ROC curve analysis and 7 were verified in 40 more participants by *** miRNAs were verified by both methods,which included 2 miRNAs that were commonly expressed in all stages of PD and 4 miRNAs that were specifically expressed in different stages of ***:The 6 serum EV-derived miRNAs,hsa-miR-374

关键词： Parkinson’s disease Hoehn and Yahr stage MicroRNAs Extracellular vesicles Biomarkers Weighted gene co-expression network analysis

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Regulating the intrinsic electronic structure of carbon nanofibers with high-spin state Ni for sodium storage with high-power density

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Journal of Materials Science & Technology 2024年第4期171卷 16-23页

作者： Zhijia Zhang Gang Xie Yuefang Chen Yanhao Wei Mengmeng Zhang shulei Chou Yunxiao Wang Yifang Zhang Yong Jiang School of Materials Science and Engineering Institute of Quantum Materials and DevicesState Key Laboratory of Separation Membrane and Membrane ProcessesTiangong UniversityTianjin 300387China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China Institute for Superconducting and Electronic Materials University of WollongongWollongongNSW 2522Australia

Carbon nanofibers(CNFs)with high specific surface area show great potential for sodium storage as a hard carbon ***,CNFs anchored with Ni nanoparticles(CNFs/Ni)were prepared through chemical vapor deposition and impregnation reduction methods,in situ growing on the three-dimensional porous copper current collector(3DP-Cu).The coupling effect of high-spin state Ni nanopar-ticles leads to the increase of defect density and the expansion of lattice spacing of ***,the 3DP-Cu ensures a high loading capacity of CNFs and short ion/electron transport *** an integral binder-free anode,the 3DP-Cu/CNFs/Ni exhibits excellent electrochemical performance,which demon-strates a high specific capacity with 298.5 mAh g^(-1)at 1000 mA g^(-1)after 1500 cycles,and a high power density with 200 mAh g^(-1)over 1000 cycles at 5000 mA g^(-1).Density functional theory calculation re-sults show that the high-spin state Ni regulates the electronic structure of CNFs,which significantly reduces the adsorption energy for Na^(+)(-2.7 Ev)and thus enables high-rate *** regulation of the electronic structure of carbon materials by high-spin state metal provides a new strategy for developing high-power carbonaceous anode materials for sodium-ion batteries.

关键词： Carbon nanofibers Ni nanoparticles High-spin state Sodium-ion batteries Anode materials Density functional theory calculation

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Improvement of titanium alloy TA19 fatigue life by submerged abrasive waterjet peening:Correlation of its process parameters with surface integrity and fatigue performance

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Chinese Journal of Aeronautics 2024年第1期37卷 377-390页

作者： Gongyu WANG shulei YAO Yuxin CHI Chengcheng ZHANG Ning WANG Yalong CheN Rongsheng LU Zhuang LI Xiancheng ZHANG Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China AECC Commercial Aircraft Engine Co.LTD Shanghai Engineering Research Center for Commercial Aircraft EngineShanghai 201108China

Submerged abrasive waterjet peening(SAWJP)is an effective anti-fatigue manufacturing technology that is widely used to strengthen aeroengine *** study investigated the correlation of SAWJP process parameters on surface integrity and fatigue life of titanium alloy *** with different water pressures and standoff distances(SoDs)was conducted on the TA19 *** surface integrity of the specimens before and after SAWJP with different process parameters was experimentally studied,including microstructure,surface roughness,microhardness,and compressive residual stress(CRS).Finally,fatigue tests of the specimens before and after SAWJP treatment with different process parameters were carried out at room *** results highlighted that the fatigue life of the TA19 specimen can be increased by 5.46,5.98,and 6.28 times under relatively optimal process parameters,which is mainly due to the improved surface integrity of the specimen after SAWJP ***,the fatigue life of specimens treated with improper process parameters is decreased by 0.55 to 0.69 times owing to the terrible surface roughness caused by the material *** work verifies that SAWJP can effectively improve the surface integrity and fatigue life of workpieces,and reveals the relationship between process parameters,surface integrity,and fatigue life,which provides support for the promotion of SAWJP in the manufacturing fields.

关键词： Fatigue testing Process parameters Submerged abrasive waterjet peening Surface integrity Surface treatment Titanium alloy TA19

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An Assembly of Pyrano[3,2-b]indol-2-ones via NHC-Catalyzed[3+3]Annulation of Indolin-3-ones with Ynals

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Chinese Journal of Chemistry 2024年第13期42卷 1487-1492页

作者： Xia Wang shulei Zhang Shao-Jie Wang Hao An Xiaolan Xin Haonan Lin Zhifeng Tu Shenci Lu Frontiers Science Center for Flexible Electronics(FSCFE) Shaanxi Institute of Flexible Electronics(SIFE)&Shaanxi Instituteof Biomedical Materials and Engineering(SiBME)Northwestern Polytechnical University(NPU)127 West Youyi RoadXi'anShaanxi 710072China School of Chemistry and Chemical Engineering Northwestern Polytechnical University(NPU)127 West Youyi RoadXi'anShaanxi 710072China

We report herein an unprecedented N-heterocyclic carbene-catalyzed formal[3+3]annulation of ynals with N-Ts indolin-3-ones under the oxidation condition affording the functionalized pyrano[3,2-b]*** alkynyl acylazoliums via the combination of a carbene with ynals in the presence of oxidate proved to be the important intermediates for the success of this *** method features a broad substrate scope and mild conditions,including axially chiral skeletons with suitable substitutions.

关键词： N-heterocyclic carbene Annulation Organocatalysis Atropisomerism Carbazole Aldehydes heterocycles Asymmetric catalysis

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Seasonal compensation implied no weakening of the land carbon sink in the Northern hemisphere under the 2015/2016 El Niño

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Science China Earth Sciences 2024年第1期67卷 281-294页

作者： Fangzhong SHI Xiuchen WU Xiaoyan LI Philippe CIAIS Hongyan LIU Chao YUE Yuting YANG shulei ZHANG Shushi PENG Yi YIN Benjamin POULTER Deliang CheN State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation Qinghai Normal UniversityXining 810016China Research and Development Center for Watershed Environmental Eco-Engineering Beijing Normal University(Zhuhai)Zhuhai 519085China Laboratoire des Sciences du Climat et de l’Environnement(LSCE) CEA-CNRS-UVSQUMR821291191Gif-sur-YvetteFrance College of Urban and Environmental Science MOE Laboratory for Earth Surface ProcessesPeking UniversityBeijing 100871China State Key Laboratory of Hydroscience and Engineering Department of Hydraulic EngineeringTsinghua UniversityBeijing 100084China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) School of Atmospheric SciencesSun Yat-sen UniversityGuangzhou 510275China California Institute of Technology PasadenaCA 91125USA Biospheric Sciences Laboratory NASA Goddard Space Flight CenterGreenbeltMaryland 20771USA Regional Climate Group Department of Earth SciencesUniversity of GothenburgGothenburg SE-40530Sweden

The recurrent extreme El Niño events are commonly linked to reduced vegetation growth and the land carbon sink over many but discrete regions of the Northern hemisphere(NH).However,we reported here a pervasive and continuous vegetation greening and no weakened land carbon sink in the maturation phase of the 2015/2016 El Niño event over the NH(mainly in the extra-tropics),based on multiple evidences from remote sensing observations,global ecosystem model simulations and atmospheric CO_(2)*** discovered a significant compensation effect of the enhanced vegetation growth in spring on subsequent summer/autumn vegetation growth that sustained vegetation greening and led to a slight increase in the land carbon sink over the spring and summer of 2015(average increases of 23.34%and 0.63%in net ecosystem exchange from two independent datasets relative to a 5-years average before the El Niño event,respectively)and spring of 2016(6.82%),especially in the extra-tropics of the NH,where the water supply during the pre-growing-season(November of the previous year to March of the current year)had a positive *** seasonal compensation effect was much stronger than that in 1997 and 1998 and significantly alleviated the adverse impacts of the 2015/2016 El Niño event on vegetation growth during its maturation *** legacy effect of water supply during the pre-growing-season on subsequent vegetation growth lasted up to approximately six *** findings highlight the role of seasonal compensation effects on mediating the land carbon sink in response to episodic extreme El Niño events.

关键词： El Niño Seasonal compensation effect Vegetation greening Land carbon sink Net ecosystem exchange Legacy effect

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Identifying the origin of porous evolution of microsized bismuth in potassium-ion batteries

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Science China Chemistry 2024年第7期67卷 2234-2239页

作者： Shenxu Chu Kaixiang Lei Qian Yang Jiaxin Li Yuqing Zhao Mengjia Gu Lin Li Xing Hu Yu Zhang Zhuo Chen Shuo Shi shulei Chou Shijian Zheng Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin 300401China Institute for Carbon Neutralization Technology College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

Microsized bismuth(Bi)with in-situ constructed three-dimensional(3D)porous network has been considered as a promising anode for high-performance potassium-ion batteries(PIBs).However,the mechanism of the in-situ porous evolution of microsized Bi during the charge/discharge process is still ***,various electrolytes are employed to disclose the origin of porous evolution of microsized Bi in *** and theoretically,the 3D porous network originates from the uniform interfacial charge distribution on the Bi surface in the linear ether-based *** addition,the universality of the interfacial charge distribution mechanism was verified by microsized Sn and *** in-situ constructed 3D porous network of Bi enables a superior potassium storage performance in a wide temperature range from-40 to 40℃.More importantly,the K_(0.9)Mn_(0.7)Ni_(0.3)O_(2)||Bi full cell delivers excellent cycling stability(a high capacity retention of 88.44%even after 2,000 cycles)and good temperature *** work gives a distinct clarification of the origin of the porous evolution of microsized Bi during cycling,which is critical for developing high-performance PIBs.

关键词： potassium-ion batteries microsized Bi porous evolution linear ether-based electrolyte interfacial charge distribution

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Rh(Ⅲ)-catalyzed late-stage C-H alkenylation and macrolactamization for the synthesis of cyclic peptides with unique Trp(C7)-alkene crosslinks

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Chinese Chemical Letters 2024年第8期35卷 270-277页

作者： shulei Hu Yu Zhang Xiong Xie Luhan Li Kaixian Chen Hong Liu Jiang Wang Department of Medicinal Chemistry School of PharmacyChina Pharmaceutical UniversityNanjing 211198China State Key Laboratory of Drug Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China Lingang Laboratoty Shanghai 200031China School of Life Science and Technology ShanghaiTech UniversityShanghai 200031China

heterocycle-braced cyclic peptides have demonstrated enhanced metabolic stability,increased potency and ***,we present a rapid synthesis method for constructing Trp(C7)-alkene(E)-crosslinked cyclic peptides with potent anti-proliferative activities against cancer cells,through C-H alkenylation and *** report addresses critical challenges associated with the installation and removal of the directing group N-Piv,configuration selectivity of the olefin,and intramolecular ***-tably,this method exhibits mild reaction conditions,traceless removal of the directing group,and high configuration selectivity.

关键词： C-H functionalization Rh(Ⅲ)-catalyzed Alkenylation Cyclic peptides Macrolactamization

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论南戏《牧羊记》的昆曲化演进

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文学遗产 2024年第4期 155-169页

作者：孙书磊南京大学文学院

南戏《牧羊记》现存较完整的版本是清咸丰八年(1858)宝善堂本,其底本的形成至迟在明初,底本内容的原创则在元末《琵琶记》创作之前。宝善堂本杂元代原创、明初改编和明清昆曲演出的诸多信息。通过对南戏《牧羊记》现存文献流变的考察,... 详细信息

南戏《牧羊记》现存较完整的版本是清咸丰八年(1858)宝善堂本,其底本的形成至迟在明初,底本内容的原创则在元末《琵琶记》创作之前。宝善堂本杂元代原创、明初改编和明清昆曲演出的诸多信息。通过对南戏《牧羊记》现存文献流变的考察,发现南戏主要通过叙事的折子戏化、曲唱的清唱化、曲体的格律化和念白的苏白化等方式实现其从南戏体制向昆曲艺术的演变。宝善堂本所体现的基于行当应工而对剧情的选择性扬弃是南戏的昆曲折子戏化的关键路径,对曲唱的清唱化、曲体的格律化处理是南戏借助雅化走向昆曲舞台的重要原则,念白的苏白化是南戏经雅化后扎根民间的有效手段。南戏昆曲化的高潮在明万历至清康熙年间,乾隆至咸丰年间仍有余绪。

关键词：南戏《牧羊记》昆曲化宝善堂本文献衍变

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