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Stable and low-resistance polydopamine methacrylamide-polyacrylamide hydrogel for brain-computer interface

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Science China Materials 2022年第8期65卷 2298-2308页

作者： Lanlan Liu Yafeng Liu ruitao tang Jun Ai Yinji Ma Ying Chen Xue Feng Institute of Flexible Electronics Technology of THU ZhejiangJiaxing Key Laboratory of Flexible Electronics based Intelligent Sensing and Advanced Manufacturing TechnologyJiaxing 314000China AML Department of Engineering MechanicsCentre for Flexible Electronics TechnologyTsinghua UniversityBeijing 100084China Qiantang Science and Technology Innovation Center Hangzhou 310016China College of Aerospace Engineering Chongqing UniversityChongqing 400044China

Signal drift and performance instability of brain-computer interface devices induced by the interface failure between rigid metal electrodes and soft human skin hinder the precise data acquisition of electroencephalogram(EEG).Thus,it is desirable to achieve a robust interface for brain-computer interface ***,a kind of polydopamine methacrylamide-polyacrylamide(PDMA-PAAM)hydrogel is *** improve the adhesion,dopamine is introduced into the polyacrylamide hydrogel,through the amino and catechol groups of dopamine in an organic-inorganic interface to build a covalent and non-covalent interaction.A strong attachment and an effective modulus transition system can be formed between the metal electrodes and human skin,so that the peeling force between the PDMAPAAM hydrogel and the porcine skin can reach 22 N m^(-1).In addition,the stable conductivity and long-term operating life of the PDMA-PAAM hydrogel for more than 60 days at room temperature are achieved by adding sodium chloride(NaCl)and glycerol,*** PDMA-PAAM hydrogel membrane fabricated in this work is integrated onto a flexible Au electrode applied in a brain-computer *** comparison,the collected EEG signal intensity and waveform are consistent with that of the commercial *** obviously,the flexible electrode with PDMA-PAAM hydrogel membrane is demonstrated to enable a more stable and userfriendly interface.

关键词： flexible electronics dopamine hydrogels braincomputer interface electroencephalogram

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陶瓷材料宏观动态新本构模型

高压物理学报 2020年第4期34卷 87-97页

作者：唐瑞涛徐柳云文鹤鸣王子豪中国科学技术大学材料力学行为和设计重点实验室安徽合肥230027

基于已有混凝土材料的相关研究,建立了陶瓷材料在动态载荷作用下的宏观本构模型。模型中状态方程采用多项式描述,强度面模型中考虑了压力相关性、Lode角效应、应变率效应、剪切损伤及拉伸软化等的影响。采用一个新的函数来描述陶瓷材料... 详细信息

基于已有混凝土材料的相关研究,建立了陶瓷材料在动态载荷作用下的宏观本构模型。模型中状态方程采用多项式描述,强度面模型中考虑了压力相关性、Lode角效应、应变率效应、剪切损伤及拉伸软化等的影响。采用一个新的函数来描述陶瓷材料的强度面,其在较高压力下趋于一个平台值;并采用动态增强因子(DIF)考察剥除惯性效应后陶瓷材料的真实应变率效应。通过将模型预测的压力-体应变响应、准静态强度面以及应变率效应与相关实验数据进行对比,验证了该模型。单个单元测试模拟得到的结果与三轴实验数据以及侵彻实验数据高度吻合,进一步验证了此模型。为显示模型的优越性,还与JH-2模型的预测结果进行了比较。结果表明:所提出的本构模型能够很好地预测陶瓷材料在不同加载条件下的力学行为,且优于现有的模型。

关键词：陶瓷材料本构模型应变率效应三轴实验 JH-2模型单单元测试

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一种柔性可穿戴式无线胎心电监测系统

中国科学：技术科学 2022年第12期52卷 1912-1922页

作者：杨辉夏建松陈波唐瑞涛陈颖艾骏付际浙江省医疗器械审评中心杭州311121 浙江清华柔性电子技术研究院嘉兴314006

胎心监测可有效反映胎儿在母体内的健康状态,为胎儿疾病诊断提供重要依据,连续精准的胎心监测对优生优育具有重要指导意义.目前胎心监测系统存在设备笨重、操作复杂、运动干扰等诸多问题,不便于随体长程连续监测.本文开发了一种柔性可... 详细信息

胎心监测可有效反映胎儿在母体内的健康状态,为胎儿疾病诊断提供重要依据,连续精准的胎心监测对优生优育具有重要指导意义.目前胎心监测系统存在设备笨重、操作复杂、运动干扰等诸多问题,不便于随体长程连续监测.本文开发了一种柔性可穿戴式无线胎心电监测系统,通过5个柔性电极贴片构成多个测量通道和干扰消除通道,结合奇异值分解算法,提高胎心电测量精度.该系统基于微加工工艺和叠层封装技术,设计柔性电极、互连导线、处理电路多单元一体化结构,采用柔性印刷电路和蛇形互连设计实现整体器件的可延展性.信号采集器件重量仅12.5 g,电极贴片厚度仅0.25 mm,可与母体腹壁共形贴合,提升佩戴舒适度,同时采集信号通过蓝牙无线传输,便于随体长时间连续的胎心监护.临床应用结果表明,该系统可准确检测胎心率、母体心率和宫缩活动,经与商用飞利浦胎儿监护仪对比,结果具有良好的一致性.同时,该无线胎心电监测系统可实现6 h以上的连续胎心电监测,为胎儿的健康监护提供有力保障.

关键词：胎心电微纳加工柔性制造柔性可穿戴系统长程无线监测

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磨粒排布对加压内冷却砂轮磨削性能的影响

机械科学与技术 2018年第4期37卷 586-591页

作者：彭锐涛李仲平唐新姿周专湘潭大学机械工程学院湖南湘潭411105

考虑磨粒排布方式对砂轮磨削效率和性能有重要影响,设计制备磨粒无序和有序排布的加压内冷却砂轮,利用砂轮表面形貌检测和图像识别技术,建立砂轮磨削GH4169高温合金的三维有限元模型。采用不同磨粒排布的砂轮开展磨削GH4169高温合金的... 详细信息

考虑磨粒排布方式对砂轮磨削效率和性能有重要影响,设计制备磨粒无序和有序排布的加压内冷却砂轮,利用砂轮表面形貌检测和图像识别技术,建立砂轮磨削GH4169高温合金的三维有限元模型。采用不同磨粒排布的砂轮开展磨削GH4169高温合金的实验研究,对比分析磨削力、磨削温度、加工表面粗糙度以及表面微观形貌,研究磨粒无序和有序两种排布方式对砂轮磨削性能的影响。结果表明:对于加压内冷却砂轮而言,相对磨粒无序排布,磨粒有序排布方式能获得更优良的加工表面质量,磨削力、磨削温度和表面粗糙度均降低,且工件表面形貌更加规则完整。

关键词：加压内冷却磨粒排布图像识别有限元模拟磨削性能

工程教育专业认证理念下的机械工程类专业建设——以湘潭大学为例

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当代教育论坛 2017年第2期 101-106页

作者：彭锐涛唐新姿陈睿湘潭大学机械工程学院湘潭大学湘潭大学机电工程系

日益激烈的国际竞争趋势是知识经济全球化背景下各国工程技术人员的机遇和挑战,工程教育专业认证不仅是国际工程教育发展趋势,更是我国高校工科专业促进专业建设、提高工程技术人才培养质量的重要契机。本文从当前机械设计制造及自动化... 详细信息

日益激烈的国际竞争趋势是知识经济全球化背景下各国工程技术人员的机遇和挑战,工程教育专业认证不仅是国际工程教育发展趋势,更是我国高校工科专业促进专业建设、提高工程技术人才培养质量的重要契机。本文从当前机械设计制造及自动化专业的工程教育现状出发,以工程教育专业认证的认证标准和基本理念为主线,确定专业的培养目标,明确培养目标与毕业要求之间的支撑关系,构建满足认证标准要求的课程体系,通过不断地持续改进加强专业建设,促进专业人才培养质量的提高。

关键词：工程教育专业认证机械工程专业建设

Fabrication and boiling heat transfer characterization of multiscale microgroove surfaces

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Science China(Technological Sciences) 2022年第12期65卷 3010-3019页

作者： tang Heng GUO Bin tang Yong WU XiaoYu PENG ruitao SUN YaLong Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518000China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510640China School of Mechanical Engineering Xiangtan UniversityXiangtan 411105China

Microstructural functional surfaces play an important role in energy conversion applications including power generation,air conditioning,and thermal management of electronics through the boiling *** this study,multi-scale microgroove surfaces were fabricated by the combination of wire electrical discharge machining(WEDM)and electrical discharge shaped machining(EDSM)to achieve a better boiling *** WEDM,with the advantage of high efficiency,was used to fabricate the first microgroove array,and rougher surfaces were formed by intense discharge.A wavy electrode was used in EDSM to fabricate the second microgroove *** cavities at the intersections of microgrooves and rougher micro fins with spacing distribution were formed after *** boiling performance of the multi-scale microgroove surface was studied with water as the working medium under atmospheric *** results indicated that the boiling performance of the microgroove surface is significantly *** critical heat flux and maximum heat transfer coefficient of microgroove surface were higher than the surfaces fabricated only by WEDM or EDSM,which were 2.34 and 3.29 times that of smooth copper plate,*** study demonstrated that the combination of WEDM and EDSM is a convenient and effective method to fabricate high-performance microgroove boiling surfaces.

关键词： multi-scale microgroove electrical discharge machining reentrant cavity boiling performance

Rapid and Efficient Investigation of Ciliate Nuclear Development During Conjugation Through Optimizing Hoechst33342 Staining Workflow

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Journal of Ocean University of China 2024年第6期23卷 1666-1676页

作者： JIANG Yaohan ZHANG Xue LIU Dan tang Xianglin GONG ruitao School of Marine Sciences Ningbo UniversityNingbo 315800China Institute of Evolution and Marine Biodiversity Ocean University of ChinaQingdao 266003China Yantai Institute China Agricultural UniversityYantai 264670China

Ciliates are eukaryotic unicellular organisms with complex morphology and developmental processes,including asexual and sexual *** is a form of sexual process that renews genetic ***,visualizing conjugation in ciliates is a challenge due to the complexity and dynamics of the process,while traditional staining methods are often insufficient for the *** study introduces a new method for visualizing developmental progression in the nuclei during conjugation using Hoechst33342 *** describes how to proceed from cell culture,conjugation induction and synchronization,staining preparation,and observation to statistical *** combination of fluorescent staining with the‘volume-fixing'technique eliminates the fixation and dehydration steps,thus reducing the overall operation time to just 20 *** method offers several advantages over traditional staining techniques for studying the nuclei during *** improves image quality and workflow efficiency and enables real-time observation of live cell *** solutions to challenges that may arise during experimental procedures are introduced and references and guidelines for cytological research are provided in this paper.

关键词： ciliates conjugation nucleus cytology Hoechst33342 staining

An internal cooling grinding wheel:From design to application

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Chinese Journal of Aeronautics 2023年第11期36卷 465-482页

作者： Xiangwu XIAO Yufeng JIN Meiliang CHEN ruitao PENG Heng tang Jiangxiong GAO School of Mechanical Engineering Xiangtan UniversityXiangtan 411105China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518000China Zhuzhou Huarui Precision Tools Co.LTD Zhuzhou 412000China

The cooling and lubrication conditions during the grinding process significantly impact the nickel-based superalloy’s final service *** existing jet cooling and heat pipe technology can solve the heat conduction problem in the grinding process of ***,managing cooling,lubrication,and chip removal are *** paper describes the design and fabrication of a novel central fluid-through internal cooling slotted grinding wheel with an ordered grain pattern to improve the grinding machinability of a nickel-based *** pressurized grinding fluid was ejected into the grinding zone via the pipe and tool holder from the lower-end face of the inner cooling *** structure of the grinding wheel was optimized using computational fluid dynamics(CFD).The flow field in the grinding area achieved the highest overall flow rate,distribution homogeneity,and effective exit flow when the internal flow channel had four *** exit for the inner runner is located at the abrasive edge and diamond staggered ***-layer brazing was used to create cubic boron nitride(CBN)abrasive rings with various abrasive *** internal cooling wheel matrix and various components were prepared according to the optimized grinding wheel geometry model.A grinding test bench was built to conduct an experimental study of grinding the nickel-based alloy *** results show that,under the same conditions,a diamond-shaped staggered pattern obtains lower grinding temperature,lower surface roughness,better surface morphology,and more significant residual compressive stress distribution than an abrasive cluster diagonal circular staggered pattern or disordered *** average effective flow rate calculated by CFD is increased by 42.3%when compared to the disordered *** the experiment,compared to the disordered arrangement,with the increase of grinding wheel’s rotating speed and coolant pressure,the average grinding temperature of abras

关键词： Flow field analysis Grinding experiment Internal cooling grinding wheel Ordered pattern Surface hardening

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落球法测量液体粘滞系数的研究与改进

实验科学与技术 2024年第2期22卷 26-29页

作者：余森源唐锐涛余其旺卞小贝王茂香南京理工大学物理实验中心南京210094

该文对落球法测量透明液体粘滞系数的实验进行了改进和深入研究。介绍了视频分析法测量液体粘滞系数实验步骤,使用开源软件Kinovea对小球下落过程进行录像追踪,剔除不合格实验过程,对合格实验过程进行逐帧分析。该方法将实验测量精度提... 详细信息

该文对落球法测量透明液体粘滞系数的实验进行了改进和深入研究。介绍了视频分析法测量液体粘滞系数实验步骤,使用开源软件Kinovea对小球下落过程进行录像追踪,剔除不合格实验过程,对合格实验过程进行逐帧分析。该方法将实验测量精度提高至240帧/S,实验误差减小至少50%。同时深入研究了尺寸效应、边缘效应对实验测量结果的影响。

关键词：液体粘滞系数落球法视频分析法实验误差