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Laser-induced breakdown spectroscopy as a method for millimeter-scale inspection of surface flatness

Plasma Science and Technology 2024年第9期26卷 148-155页

作者： Jinrui YE Yaju LI Zhao zhang Xinwei WANG Kewei TAO Qiang ZENG Liangwen CHEN Dongbin QIAN shaofeng zhang Lei YANG Xinwen MA Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000People’s Republic of China Advanced Energy Science and Technology Guangdong LaboratoryHuizhou 516000People’s Republic of China University of the Chinese Academy of Sciences Beijing 100049People’s Republic of China Key Laboratory of Atomic and Molecular Physics&Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070People’s Republic of China Queen Mary University of London Engineering School Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China

A non-contact method for millimeter-scale inspection of material surface flatness via Laser-Induced Breakdown Spectroscopy(LIBS)is investigated *** experiment is performed using a planished surface of an alloy steel sample to simulate its various flatness,ranging from 0 to 4.4 mm,by adjusting the laser focal plane to the surface distance with a step length of 0.2 *** is found that LIBS measurements are successful in inspecting the flatness differences among these simulated cases,implying that the method investigated here is *** is also found that,for achieving the inspection of surface flatness within such a wide range,when univariate analysis is applied,a piecewise calibration model must be *** is due to the complex dependence of plasma formation conditions on the surface flatness,which inevitably complicates the inspection *** solve the problem,a multivariate analysis with the help of Back-Propagation Neural Network(BPNN)algorithms is applied to further construct the calibration *** detailed analysis of the model performance,we demonstrate that a unified calibration model can be well established based on BPNN algorithms for unambiguous millimeter-scale range inspection of surface flatness with a resolution of about 0.2 mm.

关键词： laser-induced breakdown spectroscopy machine learning surface flatness

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“词藻”与“身心”:明代庐陵罗氏家族的举业与儒学

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新余学院学报 2024年第4期29卷 107-113页

作者：张少锋暨南大学文学院广东广州510632

明代庐陵罗氏在《尚书》上的家学传承,帮助家族成员在科举上取得巨大成功。与此同时,明代科举取士中出现了所谓的重首场现象,让士子们将绝大部分的精力投入制艺之上,儒家历来所强调的修养功夫开始被置于次要位置。这引起了罗氏家族成员... 详细信息

明代庐陵罗氏在《尚书》上的家学传承,帮助家族成员在科举上取得巨大成功。与此同时,明代科举取士中出现了所谓的重首场现象,让士子们将绝大部分的精力投入制艺之上,儒家历来所强调的修养功夫开始被置于次要位置。这引起了罗氏家族成员的高度警惕,其中以“罗氏三凤”即罗钦顺、罗钦德、罗钦忠为代表,三人在求学时便注重对义理之学的探讨,在科考有所成之后,更是把“治道”奉为首位。庐陵罗氏对“词藻”之学与“身心”之学的选择、反思与实践,对于揭示明代中后期士大夫的思想世界以及儒学家族传承具有较高的价值。

关键词：罗钦顺制艺 “身心”之学罗氏家族庐陵

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不同流道截面下PEMFC传质特性研究

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当代化工 2024年第8期53卷 1939-1943页

作者：张少峰兰州理工大学石油化工学院甘肃兰州730050

以不同气体流道截面以及不同压力工况作为自变量,通过Fluent软件模拟分析了质子交换膜燃料电池系统的传质特性,同时应用场协同原理,对传质过程进行了理论分析。分析结果表明:与矩形截面相比,三角形截面的流道传质性能最优,六边形截面的... 详细信息

以不同气体流道截面以及不同压力工况作为自变量,通过Fluent软件模拟分析了质子交换膜燃料电池系统的传质特性,同时应用场协同原理,对传质过程进行了理论分析。分析结果表明:与矩形截面相比,三角形截面的流道传质性能最优,六边形截面的流道传质性能最差;当提高操作压力时,阳极侧气体流道的传质性能明显增强,而阴极侧气体流道的传质性能对操作压力不敏感;气体流道内的速度场与浓度场之间的协同角越小,流道内的传质性能越好。

关键词：质子交换膜燃料电池强化传质场协同数值模拟

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电气自动化技术在新能源系统中的应用

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电子技术（上海） 2024年第4期53卷 280-281页

作者：张少峰中国电建集团河北工程有限公司河北050021

阐述电气工程自动化技术在新能源系统中的特点,提出加强发电技术的研发与创新、降低发电设备成本、规划建设更高效的新能源发电场站、实现发电场站运维智能化。

关键词：自动化技术新能源系统智能化管理

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中国高质量发展政策评价研究——基于政策文本的量化分析

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华东经济管理 2024年第9期38卷 61-72页

作者：张少峰陈昕魏玖长中共安徽省委党校(安徽行政学院)决策咨询部安徽合肥230022 山东科技大学经济管理学院山东青岛266590 中国科学技术大学管理学院安徽合肥230026

高质量发展是中国式现代化的本质要求,而政策文本是顶层设计逐级落实并指导实践的关键载体。文章采用文本共现网络和PMC指数模型,基于“政策主体—政策议题—政策效果”的理论分析框架,对中国高质量发展政策文本进行全景式分析。研究发... 详细信息

高质量发展是中国式现代化的本质要求,而政策文本是顶层设计逐级落实并指导实践的关键载体。文章采用文本共现网络和PMC指数模型,基于“政策主体—政策议题—政策效果”的理论分析框架,对中国高质量发展政策文本进行全景式分析。研究发现:国家层面文件具有战略引领作用,省级文件则以专项政策为主,政策体系具有战略部署—专项执行的层级特征;高质量发展政策核心议题呈现放射性网络,国家政策与省级政策各有特点,且有四个子议题对高质量发展政策目标形成支撑;高质量发展政策平均为“可接受”水平,国家政策效果明显优于省级政策。在中国高质量发展“一盘棋”的背景下,要进一步强化政策议题的协调性,为高质量发展创造良好的制度条件。

关键词：中国式现代化高质量发展政策文本 PMC指数模型文本共现网络

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Estimating the grain size of microgranular material using laser-induced breakdown spectroscopy combined with machine learning algorithms

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Plasma Science and Technology 2024年第5期26卷 129-137页

作者：张朝李亚举杨光辉曾强李小龙陈良文钱东斌孙对兄苏茂根杨磊张少锋马新文 Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070People’s Republic of China Advanced Energy Science and Technology Guangdong LaboratoryHuizhou 516000People’s Republic of China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000People’s Republic of China University of the Chinese Academy of Sciences Beijing 100049People’s Republic of China School of Nuclear Science and Technology University of the Chinese Academy of SciencesBeijing 100049People’s Republic of China

Recent work has validated a new method for estimating the grain size of microgranular materials in the range of tens to hundreds of micrometers using laser-induced breakdown spectroscopy(LIBS).In this situation,a piecewise univariate model must be constructed to estimate grain size due to the complex dependence of the plasma formation environment on grain *** the present work,we tentatively construct a unified calibration model suitable for LIBS-based estimation of those grain ***,two unified multivariate calibration models are constructed based on back-propagation neural network(BPNN)algorithms using feature selection strategies with and without considering prior *** detailed analysis of the performances of the two multivariate models,it was found that a unified calibration model can be successfully constructed based on BPNN algorithms for estimating the grain size in the range of tens to hundreds of *** was also found that the model constructed with a priorguided feature selection strategy had better prediction *** study has practical significance in developing the technology for material analysis using LIBS,especially when the LIBS signal exhibits a complex dependence on the material parameter to be estimated.

关键词： laser-induced breakdown spectroscopy machine learning randomly packed microgranular materials

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Estimating the yield stress of soft materials via laser-induced breakdown spectroscopy

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Chinese Physics B 2024年第3期33卷 428-432页

作者：龚书航李亚举钱东斌叶晋瑞赵扣曾强陈良文张少锋杨磊马新文 Advanced Energy Science and Technology Guangdong LaboratoryHuizhou 516000China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

Taking three typical soft samples prepared respectively by loose packings of 77-,95-,and 109-μm copper grains as examples,we perform an experiment to investigate the energy-dependent laser-induced breakdown spectroscopy(LIBS)of soft *** discovered a reversal phenomenon in the trend of energy dependence of plasma emission intensity:increasing initially and then decreasing separated by a well-defined critical *** trend reversal is attributed to the laser-induced recoil pressure at the critical energy just matching the sample's yield *** a result,a one-to-one correspondence can be well established between the samples'yield stress and the critical energy that is easily obtainable from LIBS *** allows us to propose an innovative method for estimating the yield stress of soft materials via LIBS with attractive advantages including in-situ remote detection,real-time data collection,and minimal destructive to sample.

关键词： laser-induced breakdown spectroscopy soft materials yield stress

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均压技术在矿井防灭火中的应用

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中国高新科技 2024年第9期 77-78,96页

作者：章少峰开滦集团蔚州矿业公司单侯矿河北张家口075700

为了避免毒害气体在煤矿工作面的大面积扩散,防止矿井发生火灾隐患,文章采用均压防灭火技术对单侯矿采区及回采工作面采空区进行了风压调控及防灭火管理。通过均压技术在采区之间风压调节、回采工作面回采结束的封闭及火区控制中的实践... 详细信息

为了避免毒害气体在煤矿工作面的大面积扩散,防止矿井发生火灾隐患,文章采用均压防灭火技术对单侯矿采区及回采工作面采空区进行了风压调控及防灭火管理。通过均压技术在采区之间风压调节、回采工作面回采结束的封闭及火区控制中的实践应用可知,均压防灭火技术的应用能够有效保障矿工的生命安全,推动煤矿的安全稳定可持续发展。

关键词：均压技术调节风墙调节风窗防灭火局部通风机

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State-selective charge exchange cross sections in collisions of highly-charged sulfur ions with helium and molecular hydrogen

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Chinese Physics B 2024年第2期33卷 29-33页

作者：朱小龙崔述成邢大地徐佳伟 B.Najjari 赵冬梅郭大龙高永张瑞田苏茂根张少锋马新文 Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070China Joint Laboratory of Atomic and Molecular Physics Northwest Normal University and Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730070China Advanced Energy Science and Technology Guangdong LaboratoryHuizhou 516000China

The state-selective cross section data are useful for understanding and modeling the x-ray emission in celestial *** the present work,using the cold target recoil ion momentum spectroscopy,for the first time we investigated the state-selective single electron capture processes for S^(q+)–He and H_(2)(q=11–15)collision systems at an impact energy of q×20 keV and obtained the relative state-selective cross *** results indicate that only a few principal quantum states of the projectile energy level are populated in a single electron capture *** particular,the increase of the projectile charge state leads to the population of the states with higher principal quantum *** is also shown that the experimental averaged n-shell populations are reproduced well by the over-barrier *** database is openly available in Science Data Bank at 10.57760/sciencedb.j00113.00091.

关键词： highly charged sulfur ion charge exchange state-selective cross sections COLTRIMS

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The n-resolved single-electron capture in slow O^(6+)-Ne collisions

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Chinese Physics B 2024年第7期33卷 16-20页

作者：崔述成邢大地朱小龙苏茂根高永郭大龙赵冬梅张少锋符彦飙马新文 Key Laboratory of Atomic and Molecular Physics Functional Material of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

A study of single-electron capture(SEC) in 18-240 keV O^(6+)-Ne collisions has been conducted employing a combination of experimental and theoretical *** a reaction microscope,state-selective SEC cross sections and projectile scattering angle distributions were *** translational energy spectra for SEC reveal the prevailing capture into n=3 states of the projectile ion,with a minor contribution from n=4 ***,as the projectile's energy increases,the relative contribution of SEC n=4 states increases while that of SEC n=3 states ***,we computed state-selective relative cross sections and angular differential cross sections employing the classical molecular Coulomb over-the-barrier model(MCBM) and the multichannel Landau-Zener(MCLZ) model.A discernible discrepancy between the state-selective cross sections from the two theoretical models is apparent for the considered impact ***,regarding the angular differential cross sections,an overall agreement was attained between the current experimental results and the theoretical results from the MCLZ model.

关键词： charge exchange state-selective cross sections angular differential cross sections COLTRIMS

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