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Hard-rock tunnel lithology identification using multiscale dilated convolutional attention network based on tunnel face images

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Frontiers of Structural and Civil Engineering 2023年第12期17卷 1796-1812页

作者： Wenjun ZHANG Wuqi ZHANG Gaole ZHANG Jun HUANG minggeng li Xiaohui WANG Fei YE Xiaoming GUAN School of Civil Engineering Tianjin UniversityTianjin 300350China School of Civil Engineering and Architecture Guangxi UniversityNanning 530004China Jiangxi Communications Design and Research Institute Co. Ltd.Nanchang 330000China China Railway 18th Bureau Group Co. Ltd.Tianjin 300222China School of Highway Chang'an UniversityXi'an 710064China School of Civil Engineering Qingdao University of TechnologyQingdao 266033China

For real-time classification of rock-masses in hard-rock tunnels,quick determination of the rock lithology on the tunnel face during construction is *** by current breakthroughs in artificial intelligence technology in machine vision,a new automatic detection approach for classifying tunnel lithology based on tunnel face images was *** method benefits from residual learning for training a deep convolutional neural network(DCNN),and a multi-scale dilated convolutional attention block is *** block with different dilation rates can provide various receptive fields,and thus it can extract multi-scale ***,the attention mechanism is utilized to select the salient features adaptively and further improve the performance of the *** this study,an initial image data set made up of photographs of tunnel faces consisting of basalt,granite,siltstone,and tuff was first *** classifying and enhancing the training,validation,and testing data sets,a new image data set was generated.A comparison of the experimental findings demonstrated that the suggested approach outperforms previous classifiers in terms of various indicators,including accuracy,precision,recall,F1-score,and computing ***,a visualization analysis was performed to explain the process of the network in the classification of tunnel lithology through feature ***,this study demonstrates the potential of using artificial intelligence methods for in situ rock lithology classification utilizing geological images of the tunnel face.

关键词： hard-rock tunnel face intelligent lithology identification multi-scale dilated convolutional attention network image classification deep learning

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爆炸性环境电感分断放电引燃能力及本安性能评价方法

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煤炭学报 2020年第S2期45卷 867-874页

作者：赵永秀王骑王瑶李明庚西安科技大学电气与控制工程学院陕西西安710054

应用于煤矿井下的电子电气设备必须通过本质安全评价,以确保其正常工作与发生规定故障时均不具备引燃爆炸性气体的能力。为了探究电感分断放电引燃能力的影响因素及其关系,通过IEC火花试验平台对简单电感电路进行分断放电试验,分析发现... 详细信息

应用于煤矿井下的电子电气设备必须通过本质安全评价,以确保其正常工作与发生规定故障时均不具备引燃爆炸性气体的能力。为了探究电感分断放电引燃能力的影响因素及其关系,通过IEC火花试验平台对简单电感电路进行分断放电试验,分析发现电弧电流极限值为分断初始电流,电弧电压极限值随电源电压与电感增大而增大;得到电弧电压极限值对应电弧电流变化率随电感变化的拟合关系式,发现其绝对值随电感增大近似呈幂函数关系减小;将简单电感电路等效为时变电压源的电阻电路模型分析发现电弧功率极限值随分断初始电流、电源电压与电感的增大而增大。基于试验数据和易燃易爆环境下的纯电阻电路与简单电感电路的临界引燃曲线,推导出以临界引燃功率与能量描述爆炸性环境电感分断放电引燃能力的数学表达式,发现电源电压、分断初始电流及电感的增大均使得分断放电的引燃能力增强;基于此,提出了爆炸性环境电感分断放电的本安性能评价方法,对其分析发现:仅当电感能量小于临界引燃电感能量,且电弧功率极限值小于临界引燃功率时,该简单电感电路不具有引燃能力,为本质安全电路。通过与现有本安性能评价方法以及基于IEC火花试验装置的爆炸性试验评价结果对比,证明了所提出引燃能力评价方法的可行性与可靠性,并可良好适用于电感较小等极端场合。

关键词：电感分断放电放电特性极限值引燃能力电弧功率本安判据

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暗挖隧道近接并行下穿既有铁路安全性研究

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铁道建筑技术 2024年第10期 164-167,213页

作者：李明耿中铁十八局集团有限公司天津300222

随着地下暗挖隧道大规模建设,近接并行下穿既有铁路工程越来越多,施工风险也随之升高。新建隧道近接既有铁路施工会对周围土体产生扰动,引起地层损失及轨道路基沉降,因此研究暗挖隧道近接并行下穿既有铁路的安全性对于控制轨道变形、保... 详细信息

随着地下暗挖隧道大规模建设,近接并行下穿既有铁路工程越来越多,施工风险也随之升高。新建隧道近接既有铁路施工会对周围土体产生扰动,引起地层损失及轨道路基沉降,因此研究暗挖隧道近接并行下穿既有铁路的安全性对于控制轨道变形、保证运营安全十分重要。本文基于某市政暗挖隧道近接既有铁路工程,结合工程特点确定铁路安全控制标准值,通过数值模拟分析隧道并行和下穿两种近接情况对既有铁路变形影响,并进行安全性研究。结果表明:新建暗挖隧道施工对既有铁路结构影响较小,变形满足相关安全控制标准,可为实际工程施工提供理论依据和有益指导。

关键词：暗挖隧道近接施工并行下穿既有铁路安全性数值分析

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清代医家梁廉夫辨治小儿痘证经验探析

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中国中医急症 2024年第5期33卷 899-901页

作者：李明庚戴铭广西中医药大学广西南宁530200

清代医家梁廉夫在辨治小儿痘证方面有其独到之处。梁氏认为小儿痘证乃体内胎毒受时邪侵入触动而发;辨治时强调需辨痘与伤寒之别,辨气病血病,辨表里寒热。在治疗痘证方面,提出了三宜三忌:宜细察虚实,忌妄投医药;宜益气补血,忌克伐气血;... 详细信息

清代医家梁廉夫在辨治小儿痘证方面有其独到之处。梁氏认为小儿痘证乃体内胎毒受时邪侵入触动而发;辨治时强调需辨痘与伤寒之别,辨气病血病,辨表里寒热。在治疗痘证方面,提出了三宜三忌:宜细察虚实,忌妄投医药;宜益气补血,忌克伐气血;宜健脾益肾,忌清热败毒。本文通过研究其著作《不知医必要》,浅析梁氏辨治小儿痘证的学术经验,以期为现代临床诊疗提供参考。

关键词：小儿痘证《不知医必要》梁廉夫辨治经验

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有源箝位反激变换器能量传输模式及输出纹波电压分析

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河南师范大学学报（自然科学版） 2022年第3期50卷 119-125页

作者：赵永秀蔡培军李明庚王骑西安科技大学电气与控制工程学院西安710054

为了给有源箝位反激变换器的设计和制作提供理论指导,对其能量传输模式进行深入研究,根据流过副边整流二极管电流的连续与断续状态,将有源箝位反激变换器划分为连续导电模式(CCM)和不连续导电模式(DCM),发现其工作于CCM时,存在2种能量... 详细信息

为了给有源箝位反激变换器的设计和制作提供理论指导,对其能量传输模式进行深入研究,根据流过副边整流二极管电流的连续与断续状态,将有源箝位反激变换器划分为连续导电模式(CCM)和不连续导电模式(DCM),发现其工作于CCM时,存在2种能量传输模式;工作于DCM时,存在1种能量传输模式.推导出各模式的输出纹波电压解析式并进行对比分析,指出变换器工作于DCM模式时,输出纹波电压随变压器电感和箝位电容的增大而减小;工作于CCM模式时,输出纹波电压与变压器电感无关,随箝位电容的增大而减小.仿真和实验验证了理论分析的正确性.

关键词：有源箝位反激能量传输模式输出纹波电压

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适用于露天矿时序形变监测的优化DS-InSAR技术

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金属矿山 2023年第1期 110-118页

作者：李鸣庚张书毕高延东李世金张艳锁贾义琨孔令辰中国矿业大学环境与测绘学院江苏徐州221116 自然资源部国土环境与灾害监测重点实验室江苏徐州221116

露天矿形变监测对矿区安全开采具有重要意义。针对常规监测手段存在的效率低、成本高、难以获取某一地区内露天矿区大范围、长时序的地表形变特征的问题,提出了一种采用复相干矩阵分解法进行相位优化的优化分布式目标In SAR(Distributed... 详细信息

露天矿形变监测对矿区安全开采具有重要意义。针对常规监测手段存在的效率低、成本高、难以获取某一地区内露天矿区大范围、长时序的地表形变特征的问题,提出了一种采用复相干矩阵分解法进行相位优化的优化分布式目标In SAR(Distributed Target Interferometric Synthetic Aperture Radar,DS-InSAR)时序地表形变监测方法。该方法在通过快速同质点识别算法Fa SHPS(Fast Statistically Homogeneous Pixels Selection,FaSHPS)提取同质像元的基础上,采用复相干矩阵特征值分解法实现相位优化,融合永久散射体(Persistent Scatterers,PS)获取时序地表形变信息。利用50景Sentinel-1A SAR影像,获取了2020年1月—2021年8月辽宁省鞍山地区齐大山矿、大孤山矿、鞍千矿3个矿区的时序地表形变特征。结果表明:监测时段内大孤山矿、齐大山矿与鞍千矿共存在5处形变区,最大累积形变量为-493.43 mm,各形变区时序形变特征与露天矿开采活动高度相关;与常规时序In SAR技术相比,该技术有效提高了获取的同质像元密度及可靠性,获取的监测点数量是后者的1.253倍,点位空间分布更为均匀,获取的形变场更加完整;两者相同点位形变量监测结果的相关系数为0.8556,证明所采用的DS-InSAR技术可靠性较高,能够较好地实现对露天矿区高精度、大范围、长时序的地表形变监测。

关键词：露天矿山 DS-InSAR 地表形变形变监测

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Constraints on holographic QCD phase transitions from PTA observations

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 71-78页

作者： Song He li li Sai Wang Shao-Jiang Wang Center for Theoretical Physics and College of Physics Jilin University School of Physical Science and Technology Ningbo University Max Planck Institute for Gravitational Physics (Albert Einstein Institute) CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences (UCAS) School of Physical Sciences University of Chinese Academy of Sciences (UCAS) Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences

The underlying physics of QCD phase transition in the early Universe remains largely unknown due to its strong-coupling nature during the quark-gluon plasma/hadron gas transition, yet a holographic model has been proposed to quantitatively fit the lattice QCD data while with its duration of the first-order phase transition(FoPT) left undetermined. At specific baryon chemical potential, the first-order QCD phase transition agrees with the observational constraint of baryon asymmetry. It, therefore, provides a scenario for phase transition gravitational waves(GWs) within the standard model of particle physics. If these background GWs could contribute dominantly to the recently claimed common-spectrum red noise from pulsar timing array(PTA) observations, the duration of this FoPT can be well constrained, and the associated primordial black holes are still allowed by current observations.

关键词： pulsar timing array QCD phase transition gravitational waves primordial black holes

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Cell polarization in ischemic stroke: molecular mechanisms and advances

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Neural Regeneration Research 2025年第3期20卷 632-645页

作者： Yuanwei li Xiaoxiao Xu Xuan Wu Jiarui li Shiling Chen Danyang Chen Gaigai li Zhouping Tang Department of Neurology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei ProvinceChina

Ischemic stroke is a cerebrovascular disease associated with high mortality and disability rates. Since the inflammation and immune response play a central role in driving ischemic damage, it becomes essential to modulate excessive inflammatory reactions to promote cell survival and facilitate tissue repair around the injury site. Various cell types are involved in the inflammatory response, including microglia, astrocytes, and neutrophils, each exhibiting distinct phenotypic profiles upon stimulation. They display either proinflammatory or anti-inflammatory states, a phenomenon known as ‘cell polarization.’ There are two cell polarization therapy strategies. The first involves inducing cells into a neuroprotective phenotype in vitro, then reintroducing them autologously. The second approach utilizes small molecular substances to directly affect cells in vivo. In this review, we elucidate the polarization dynamics of the three reactive cell populations(microglia, astrocytes, and neutrophils) in the context of ischemic stroke, and provide a comprehensive summary of the molecular mechanisms involved in their phenotypic switching. By unraveling the complexity of cell polarization, we hope to offer insights for future research on neuroinflammation and novel therapeutic strategies for ischemic stroke.

关键词： astrocyte polarization immune regulation inflammation ischemic injury microglia polarization neutrophil polarization signaling pathways stroke

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Design of a cationic accelerator enabling ultrafast ion diffusion kinetics in aqueous zinc-ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 377-384页

作者： Yawei Xiao Qianqian Gu Haoyu li Mengyao li Yude Wang National Center for International Research on Photoelectric and Energy Materials School of Materials and Energy Yunnan University Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources School of Chemistry and Chemical Engineering Hainan University College of Chemical Engineering Fuzhou University Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies Yunnan University

Aqueous zinc-ion batteries are highly favored for grid-level energy storage owing to their low cost and high safety,but their practical application is limited by slow ion *** address this,a strategy has been developed to create a cation-accelerating electric field on the surface of the cathode to achieve ultrafast Zn2+diffusion *** employing electrodeposition to coat MoS2on the surface of BaV6O16·3H2O nanowires,the directional built-in electric field generated at the heterointerface acts as a cation accelerator,continuously accelerating Zn2+diffusion into the active *** optimized Zn2+diffusion coefficient in CC@BaV-6O16·3H2O@MoS2(7.5×10～8cm2s-1) surpasses that of most reported V-based ***,MoS2serving as a cathodic armor extends the cycling life of the Zn-CC@BaV6O16·3H2O@MoS2full batteries to over 10000 *** work provides valuable insights into optimizing ion diffusion kinetics for high-performance energy storage devices.

关键词： Internal electric field Cationic accelerator Ion diffusion kinetics Cathode modification strategy Aqueous zinc ion battery

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Preparation of silver nanoparticles through the reduction of straw-extracted lignin and its antibacterial hydrogel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 504-514页

作者： Lou Zhang Shuo li Fu Tang Jingkai Zhang Yuetong Kang Hean Zhang lidong li State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Silver nanoparticles(Ag NPs)have attracted attention in the field of biomaterials due to their excellent antibacterial ***,the reducing and stabilizing agents used for the chemical reduction of Ag NPs are usually toxic and may cause water *** this work,Ag NPs(31.2 nm in diameter)were prepared using the extract of straw,an agricultural waste,as the reducing and stabilizing *** analysis revealed that the straw extract contained lignin,the structure of which possesses phenolic hydroxyl and methoxy groups that facilitate the reduction of silver salts into Ag *** surfaces of Ag NPs were negatively charged due to the encapsulation of a thin layer of lignin molecules that prevented their *** the prepared Ag NPs were added to the precursor solution of acrylamide,free radical polymerization was triggered without the need for extra heating or light irradiation,resulting in the rapid formation of an Ag NP-polyacrylamide composite *** inhibition zone test proved that the composite hydrogel possessed excellent antibacterial ability due to the presence of Ag *** prepared hydrogel may have potential applications in the fabrication of biomedical materials,such as antibacterial dressings.

关键词： silver nanoparticles hydrogel straw extraction antibacterial

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