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Recent Progress of Graphene Fiber/Fabric Supercapacitors:From Building Block Architecture,Fiber Assembly,and Fabric Construction to Wearable Applications

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Advanced Fiber Materials 2023年第3期5卷 896-927页

作者： Tuxiang guan Zemei Li Dianchun Qiu guan {2. Jian {2. Liping Zhu Meifang Zhu Ningzhong Bao State Key Laboratory of Materials‑Oriented Chemical engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009People’s Republic of China National engineering Lab for Textile Fiber Materials and Processing technology School of Materials Science and EngineeringZhejiang Sci-Tech UniversityHangzhou 310018People’s Republic of China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620People’s Republic of China

High-performance fiber-shaped power sources are anticipated to considerably contribute to the continuous development of smart wearable *** one-/two-dimensional(1D/2.)frameworks constructed from graphene sheets,graphene fibers and fabrics inherit the merits of graphene,including its lightweight nature,high electrical conductivity,and exceptional mechanical *** as-fabricated graphene fiber/fabric flexible supercapacitor(FSC)is,therefore,regarded as a promis-ing candidate for next-generation wearable energy storage devices owing to its high energy/power density,adequate safety,satisfactory flexibility,and extended cycle *** gap between practical applications and experimental demonstrations of FSC is drastically reduced as a result of technological *** this end,herein,recent advancements of FSCs in fiber element regulation,fiber/fabric construction,and practical applications are methodically reviewed and a forecast of their growth is presented.

关键词： Graphene fibers/fabrics Flexible supercapacitor Element regulation Fiber/fabric construction Wearable application

Laser ultrasonic testing for near-surface defects inspection of 316L stainless steel fabricated by laser powder bed fusion

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china Foundry 2021年第4期18卷 360-368页

作者： Ting Dai Xiao-jian Jia Jun Zhang Jin-feng wu Yi-wei Sun Shu-xian Yuan guan-bing Ma Xiao-jing Xiong {2. Ding school of Materials Science and engineering Southeast UniversityNanjing 211189China school of power and {2. engineering Wuhan UniversityWuhan 430072China CGN Inspection technology Co. Ltd.Suzhou 215100JiangsuChina Monash(Suzhou)engineering technology Co. Ltd.Suzhou 215123JiangsuChina

The laser powder bed fusion(L-PBF)method of additive manufacturing(AM)is increasingly used in various industrial manufacturing fields due to its high material utilization and design freedom of ***,the parts produced by L-PBF usually contain such defects as crack and porosity because of the technological characteristics of L-PBF,which affect the quality of the *** ultrasonic testing(LUT)is a potential technology for on-line testing of the L-PBF *** is a non-contact and non-destructive approach based on signals from abundant waveforms with a wide *** this study,a method of LUT for on-line inspection of L-PBF process was proposed,and a system of LUT was established approaching the actual environment of on-line detection to evaluate the method applicability for defects detection of L-PBF *** detection results of near-surface defects in L-PBF 316L stainless steel parts show that the crack-type defects with a sub-millimeter level within 0.5 mm depth can be identified,and accordingly,the positions and dimensions information can be *** results were verified by X-ray computed tomography,which indicates that the present method exhibits great potential for on-line inspection of AM processes.

关键词： additive manufacturing 316L stainless steel on-line inspection laser ultrasonic testing non-destructive testing

Experimental research of the cavitation bubble dynamics during the second oscillation period near a spherical particle

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Journal of Hydrodynamics 2023年第4期35卷 700-711页

作者： Xiao-yu Wang Hong-chen Su Shao-wei Li guan-hao wu Xiao-xiao Zheng Ya-xin Duan Yu-ning Zhang Key Laboratory of power Station Energy Transfer Conversion and System(Ministry of Education) School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou310027China

In this paper,the dynamic behaviors of the cavitation bubble near a fixed spherical particle during the second oscillation period are analyzed based on the high-speed photographic *** deformation and motion of the bubble during the second period are investigated by changing the distance between the particle and the bubble and the maximum radius of the ***,the variation of the equivalent radius and the centroid motions are analyzed,and the dynamic behaviors of the bubble are categorized according to the bubble morphological characteristics during the second *** this research,it is found that(1)The dynamic behaviors of the bubble during the second oscillation period could be divided into three typical cases:For case 1,a bulge would exist on the bubble interface away from the particle,and for case 2.a bulge would appear on the bubble interface and evolve towards the particle,while for case 3,the bubble would be divided into two parts.(2.The larger the dimensionless distance between the particle and the bubble,the smaller the maximum bubble equivalent radius in the second period,and the shorter the second oscillation period.(3)When the bubble is close to the particle,a counter-jet appears at the bubble interface away from the particle during the rebound stage.

关键词： Cavitation bubble dynamics particle-bubble interaction second oscillation period high-speed photography

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电液伺服泵控系统的速度控制实验研究

组合机床与自动化加工技术 2016年第9期 61-63,67页

作者：吴楝华喜冠南孙春亚朱建新南通大学机械工程学院江苏南通226019 上海交通大学机械与动力工程学院上海200240

在提高电液伺服系统位置控制精度的同时,系统的响应速度也不容忽略。对试验台采用的电液伺服泵控系统进行了分析;设定目标位移为130mm,估算了系统液压缸到目标位置所需的最短理论时间;采用分段模糊PID控制策略,获得最优PID参数;设定位移... 详细信息

在提高电液伺服系统位置控制精度的同时,系统的响应速度也不容忽略。对试验台采用的电液伺服泵控系统进行了分析;设定目标位移为130mm,估算了系统液压缸到目标位置所需的最短理论时间;采用分段模糊PID控制策略,获得最优PID参数;设定位移前100mm为快速运动阶段,调节该阶段泵输出的流量与压力。实验结果发现,流量模拟量从3000增至6000时,运动至100mm的时间变化不明显,而当压力模拟量从1000增加至2.00时,运动至100mm的时间可由1.41s缩短为0.78s,系统迟滞时间也从0.2.s降至0.16s。结果表明,增大流量模拟量对液压缸速度提高的效果影响较小,而增大压力模拟量对液压缸速度提高效果的影响较为明显。

关键词：电液伺服系统速度控制分段模糊PID控制压力控制

薄壁大尺寸铌铪合金零件强力旋压的数值模拟研究

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锻压技术 2023年第7期48卷 64-70页

作者：闫静锴雒亚涛李冰关铂镔周兵营吴向东北京航空航天大学机械工程及自动化学院北京100191 西安航天发动机有限公司陕西西安710100

探究了工艺参数对薄壁大尺寸铌铪合金零件强力旋压工艺的影响规律,以指导实际的生产过程。在实际工艺的基础上,利用Abaqus/Explicit软件建立其强力旋压的有限元模型,并通过正交试验极差分析法对旋轮与芯模间隙、旋轮进给比以及旋轮与旋... 详细信息

探究了工艺参数对薄壁大尺寸铌铪合金零件强力旋压工艺的影响规律,以指导实际的生产过程。在实际工艺的基础上,利用Abaqus/Explicit软件建立其强力旋压的有限元模型,并通过正交试验极差分析法对旋轮与芯模间隙、旋轮进给比以及旋轮与旋压件之间的摩擦因数等工艺参数对旋压件贴模性的影响规律进行研究。结果表明,强力旋压过程中旋轮进给比对旋压件贴模性的影响程度最大,而旋轮与芯模间隙的影响程度最小。对于薄壁大尺寸铌铪合金零件,当旋轮进给比为0.2. mm·r^(-1)、旋轮与旋压件间的摩擦因数为0.05、旋轮与芯模间隙为3 mm时,强力旋压的贴模性最好,平均贴模间隙均值仅为1.003 mm。采用得到的工艺参数进行试验,进一步验证了有限元仿真分析的准确性。

关键词： NbHf10-1铌铪合金强力旋压贴模性进给比贴模间隙

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水泥稳定掘进煤矸石公路基层应用试验研究

公路 2023年第11期68卷 20-29页

作者：尉晓雪杨彪吴靖江姚贤华汪德才管俊峰中国建筑第七工程局有限公司郑州市450000 华北水利水电大学土木与交通学院郑州市450000

通过室内144个试件和现场300 m试验段13个试件的试验研究,进行了掘进煤矸石基本物理化学特性以及水泥稳定掘进煤矸石的力学性能、抗冻性能研究,并通过扫描电镜(SEM)分析了水泥稳定掘进煤矸石的微观结构变化规律。试验结果表明,室内试件... 详细信息

通过室内144个试件和现场300 m试验段13个试件的试验研究,进行了掘进煤矸石基本物理化学特性以及水泥稳定掘进煤矸石的力学性能、抗冻性能研究,并通过扫描电镜(SEM)分析了水泥稳定掘进煤矸石的微观结构变化规律。试验结果表明,室内试件7 d无侧限抗压强度随水泥掺量的增加而增大,最小值为6.2.MPa(水泥掺量4%),满足高速公路和一级公路极重、特重交通基层要求;最大值为9.2.MPa(水泥掺量6%),比《公路路面基层施工技术细则》(JTG/T F2.—2.15)中要求的强度最大值提高了31.4%。基于回归分析,建立了现场与室内无侧限抗压强度关系模型。室内冻融循环试验表明,水泥掺量5.5%的室内试件抗冻性能较好;微观结构表明,由于现场施工工艺(碾压、铺摊等)的影响,现场试件出现少量裂缝。

关键词：水泥稳定掘进煤矸石力学性能抗冻性能微观结构