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Effect of electron beam irradiation on surface molecule and flashover voltage of epoxy composites

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High Voltage 2024年第3期9卷 528-536页

作者： mingru li Huan Niu Kai Shang Jianyu Lang Yafang Gao Bingnan li Jiuhui Zhao Zhen li Yang Feng Shengtao li State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anShaanxiChina Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbinHeilongjiangChina

The unsatisfactory insulating properties of solid–gas interfaces seriously restrict the development of high-voltage electrical equipment and threaten their power supply ***-beam irradiation(EBI)can effectively improve the surface flashover voltage of ***,the underlying mechanism of EBI in tailoring the surface trap and improving the flashover voltage remains *** this study,the surface morphologies and chemical compositions of epoxy composites treated with EBI were *** addition,the surface wetting properties,surface charge migration pa-rameters,and surface flashover voltages were experimentally *** was found that EBI aggravated the surface morphology,changed the surface chemical components,and repressed surface charge *** a result,the contact angle was reduced from 103.7°to 78.43°,and the flashover voltage in SF6 was increased from 35.26 to 38.90 *** calculations showed that the newly generated C–O–H and C=O bonds on the surface molecules after EBI formed charge centres at the molecular electrostatic potential,which enhanced the trapping effect of the surface deep *** a result,surface charge migration was repressed,and the surface flashover voltage was *** study could promote the further development of EBI on materials modification.

关键词： composites surface beam

Pore Structure Characteristics of Baking-Free Slag-Sludge Bricks and Its Correlations to Mechanical Properties

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Journal of Renewable Materials 2021年第10期9卷 1805-1819页

作者： Lei Guo Pingping Chen lixia Guo Zhilong Xue Zi Guan mingru li School of Water Conservancy North China University of Water Resources and Electric PowerZhengzhou450046China Henan Water Valley Research Institute Zhengzhou450046China Henan Key Laboratory of Water Environment Simulation and Treatment Zhengzhou450002China Henan Water Conservancy Investment Yuyuan Water Ecology Co.Ltd. Pingyu463400China

In order to explore the relationship between the macroscopic properties and pore structure characteristics of baking-free slag-sludge bricks,the compressive strength and water absorption rate using aluminum industrial slag and sludge of different substitution rates were *** instruments and image analysis software were used to measure the parameters of the pore ***,a fractal model was built based on the fractal theory,in which the fractal dimension was used as the characteristic index of the pore structure to analyze the correlation and interaction mechanism between the fractal dimension and the macroscopic mechanical *** on this study,conclusions were drawn as follows:(1)The plane pore structure of baking-free bricks shows good fractal *** the increase of the aluminum industrial slag content,the fractal dimension becomes smaller and the pore structure develops well;with the increase of the sludge content,the fractal dimension becomes larger and the pore structure becomes worse;(2)As the fractal dimension of the plane pore structure increases,the compressive strength of baking-free bricks falls,and the porosity and water absorption rise;(3)The optimum content of baking-free slag-sludge bricks is aluminum industrial slag 30%and sludge 10%.After 7 days of curing,baking-free bricks boast higher performance,and fully meet the performance requirements of solid concrete bricks(MU40),which can reduce time costs,and enhance enterprise revenue.

关键词： Aluminum industrial slag sludge baking-free brick mechanical property fractal dimension

Effects of Recycled Aggregate Content on Pervious Concrete Performance

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Journal of Renewable Materials 2020年第12期8卷 1711-1727页

作者： Lei Guo Zi Guan lixia Guo Weiping Shen Zhilong Xue Pingping Chen mingru li School of Water Conservancy North China University of Water Resources and Electric PowerZhengzhou450046China Henan Water Valley Research Institute Zhengzhou450046China Henan Key Laboratory of Water Environment Simulation and Treatment Zhengzhou450002China

A recycled aggregate(RA)was prepared by crushing and sieving demolished discarded concrete pavements and was subsequently tested and analyzed to determine its various physical *** this basis,pervious concrete(PC)mix proportions were *** RA particles with sizes of 5–10 and 10–20 mm were *** specimens were prepared with a water–cement ratio of 0.3,an aggregate–cement ratio of 4.5,the substitute rates of RA with 0,25%,50%,75%and a single-/double-gap-graded RA mix(mass ratio of particles with sizes of 5–10 mm to particles with sizes of 10–20 mm:1:1,1:2,2:1,2:3 and 3:2).Various properties of the RA-containing PC(RPC)were determined by analyzing the compressive strength,splitting tensile strength,effective porosity,permeation coefficient and impact and abrasion resistance of the *** results showed the following:The density of the RPC decreased with an increasing RA replacement *** density of the RPC prepared with a double-gapgraded RA mix was lower than that prepared with a single-gap-graded RA(particle size:10–20 mm)*** permeation coefficient of the RPC increased with increasing *** splitting tensile strength of the RPC was positively correlated with its compressive *** compressive strength of the RPC decreased with increasing *** regression analysis showed that the impact and abrasion resistance of the RPC increased with increasing compressive *** addition,all of the RPC specimens met the strength and permeation require*** study can provide theoretical support for the application of RPC.

关键词： Recycled aggregate recycled pervious concrete strength permeability wear resistance mix proportion

低能N^+注入芽孢杆菌与酵母菌的Monte-Carlo模拟与分析

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基因组学与应用生物学 2015年第8期34卷 1729-1733页

作者：李明儒毛培宏新疆大学物理科学与技术学院离子束生物技术中心乌鲁木齐830046

低能离子注入技术和方法已广泛应用于微生物诱变育种,为了进一步理解低能N+注入原核微生物与真核微生物细胞的离子输运过程与效应,本文根据腊样芽孢杆菌和酿酒酵母菌的化学组成与细胞结构,建立了两种简化的微生物靶材料模型,利用Monte-C... 详细信息

低能离子注入技术和方法已广泛应用于微生物诱变育种,为了进一步理解低能N+注入原核微生物与真核微生物细胞的离子输运过程与效应,本文根据腊样芽孢杆菌和酿酒酵母菌的化学组成与细胞结构,建立了两种简化的微生物靶材料模型,利用Monte-Carlo方法计算了能量15 Ke V的N+注入在两种不同类型微生物细胞中的离子射程分布、径迹结构、能量沉积及靶损伤情况,比较了N+注入对微生物细胞的损伤效应,对芽孢杆菌死亡率高于酵母菌死亡率的机理进行了理论分析。

关键词：低能N+注入芽孢杆菌酵母菌 Monte-Carlo模拟损伤效应

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《红楼梦》预示艺术比较研究述评

河南教育学院学报（哲学社会科学版） 2013年第1期32卷 18-21页

作者：李明茹安徽师范大学文学院

20世纪80年代以来,学界开始重视《红楼梦》预示艺术的比较研究,并作别开生面的认知和阐释,取得了一些成绩,也存在认识不足或缺少理论支撑等问题。

关键词：《红楼梦》预示艺术比较研究述评

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铝合金模板降本增效的技术经济可行性研究

铁道建筑技术 2024年第5期 184-186,204页

作者：李明儒北京中铁建建筑科技有限公司北京100040

随着铝合金模板在高层住宅建筑中广泛使用,铝合金模板租赁价格随着市场竞争的日益激烈而逐渐下降,利润空间逐渐降低。在这种背景下,降低铝合金模板成本并提高周转效率显得尤为重要。本文分析铝合金模板传统工艺需解决的问题,研究降低成... 详细信息

随着铝合金模板在高层住宅建筑中广泛使用,铝合金模板租赁价格随着市场竞争的日益激烈而逐渐下降,利润空间逐渐降低。在这种背景下,降低铝合金模板成本并提高周转效率显得尤为重要。本文分析铝合金模板传统工艺需解决的问题,研究降低成本的技术重难点和解决方案,优化模板设计,改进技术工艺,替换原有材料,实现铝合金模板降本增效并持续为企业创造利润。结果表明,通过对铝合金模板的设计、生产和供应链等环节进行优化,可实现降低铝合金模板生产成本,提高企业竞争力和经济效益。

关键词：铝合金模板降本增效技术研发工艺改进材料替代供应链优化

日本非洲研究六十年:学科发展与机构建设——基于日本科研补助金数据库的调查

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中国非洲学刊 2023年第2期4卷 130-154,160页

作者：李明儒日本同志社大学国际研究院

日本的非洲研究已经走过60多年的历程,其研究领域从最初以人类学研究为主导逐渐向语言学、地理学、农学、兽医学等领域扩展,形成了其独有的研究特色。本文基于对日本科研补助金数据库(KAKENHI)的调查,一方面从其历史发展的视角出发,概... 详细信息

日本的非洲研究已经走过60多年的历程,其研究领域从最初以人类学研究为主导逐渐向语言学、地理学、农学、兽医学等领域扩展,形成了其独有的研究特色。本文基于对日本科研补助金数据库(KAKENHI)的调查,一方面从其历史发展的视角出发,概括日本对非研究中核心领域的成就与贡献;另一方面从研究机构的视角出发,通过对日本关西地区、关东地区、中部地区以及北海道地区代表性学术机构的调查,探索日本非洲研究的地域性特征。通过对日本非洲研究发展路径的多维度探讨,本文旨在对日本非洲研究的特点做出总结与概括,以期为我国非洲研究的发展提供新的借鉴与思考。

关键词：日本非洲研究日本科研补助金数据库学科发展机构建设

纳米TiO_(2)-MWCNTs掺杂提升环氧绝缘材料真空直流沿面闪络性能

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绝缘材料 2021年第8期54卷 39-44页

作者：申巍李明儒李枕李盛涛国网陕西省电力公司电力科学研究院陕西西安710199 西安交通大学电力设备电气绝缘国家重点实验室陕西西安710049

选用两种纳米填料:纳米氧化钛(TiO_(2))和多壁羟基碳纳米管(MWCNTS),向环氧树脂中单独或同时加入两种粒子,制备16种不同的环氧纳米复合电介质。通过体积电阻率测试、表面电位衰减试验与真空直流沿面闪络试验,探究纳米粒子对环氧纳米复... 详细信息

选用两种纳米填料:纳米氧化钛(TiO_(2))和多壁羟基碳纳米管(MWCNTS),向环氧树脂中单独或同时加入两种粒子,制备16种不同的环氧纳米复合电介质。通过体积电阻率测试、表面电位衰减试验与真空直流沿面闪络试验,探究纳米粒子对环氧纳米复合电介质沿面闪络特性的影响。结果表明:环氧纳米复合电介质的沿面闪络电压与填料的质量分数有关,适量的纳米填料会提升复合电介质的沿面闪络电压。单独加入纳米TiO_(2)与MWCNTS分别将闪络电压提升了14.49%和23.11%,同时加入两种填料可进一步将闪络电压提升至44.99 kV,提升幅度高达36.06%。通过表面电位衰减曲线计算了材料的表面陷阱特性。分析深陷阱与沿面闪络电压的关系发现,闪络电压与深陷阱能级线性相关,陷阱能级越深,闪络电压越高。同时添加两种纳米粒子可以提高材料的深陷阱深度,从而抑制材料表面电子发射和电荷输运过程,提高沿面闪络电压。

关键词：沿面闪络陷阱特性纳米复合材料环氧树脂

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活性焦烟气脱硫技术研究

四川化工 2018年第2期21卷 22-25页

作者：李明儒巴中市环境监测中心站四川巴中636000

二氧化硫是造成我国酸雨的主要污染物质,主要来自于化石燃料的燃烧。目前烟气脱硫技术(FGD)是重要的脱硫手段,而活性焦因其高比表面积、发达的孔隙结构、丰富的官能团和高机械强度,被认为是极具前景的干法FGD技术。本文主要对活性焦烟... 详细信息

二氧化硫是造成我国酸雨的主要污染物质,主要来自于化石燃料的燃烧。目前烟气脱硫技术(FGD)是重要的脱硫手段,而活性焦因其高比表面积、发达的孔隙结构、丰富的官能团和高机械强度,被认为是极具前景的干法FGD技术。本文主要对活性焦烟气脱硫技术进行了介绍,以及其在国内外工业上的应用进行了综述,分析了各种技术的优缺点,并总结了存在的问题。

关键词：活性焦烟气脱硫脱硫再生