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Fabricating bio-inspired high impact resistance carbon nanotube network films for multi-protection under an extreme environment

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Nano Research 2024年第9期17卷 7793-7802页

作者： Mingquan Zhu Kailu Xiao Wei Zhang xudong lei Yunxiang Bai Shijun Wang Peng Zhang Feng Gao Congying Wang Wenqiang Xu Huiyong Li Xianqian Wu Chao Wang Hui Zhang Luqi Liu Zhong Zhang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Department of Materials Science and Engineering Texas A&M UniversityCollege StationTexas 77840USA Institute of Mechanics Chinese Academy of SciencesBeijing 100190China School of Astronautics Harbin Institute of TechnologyHarbin150001China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China

The fabrication of light-weight,highly impact-resistant,and energy-absorbent materials is urgently demanded in many facets of the society from body armor to aerospace engineering,especially under an extreme *** nanotubes(CNTs),one of the strongest and toughest materials ever found,also have good conductivity,chemical stability,and thermal stability,etc,making them a competitive candidate as building blocks to help achieve the above *** this work,a kind of CNT network was prepared by using chlorosulfonic acid(CSA)to release the internal stress of super-aligned carbon nanotube films(SA-CNTF)and dendritic polyamide amine(PAMAM)to further introduce multiple hydrogen bonds and interlocking *** fabricated bioinspired carbon nanotube network films(PAMAM@C-CNTF)have a high toughness of 45.97 MJ/m3,showing an increase of 420%compared to neat *** importantly,the anti-impact performance of the films(e.g.,with a maximum specific energy absorption of 1.40 MJ/kg under 80-100 m/s projectile impact)is superior to that of conventional protective materials from steel and Kevlar fiber,and also exceeds that of any other reported carbon-based *** hierarchical energy dissipation mechanism was further revealed through experiment and *** functions including intelligent heating/anti-icing,ultraviolet protection,as well as electromagnetic interference shielding properties make these network films have great potential in practical multi-protection applications,especially under an extreme environment.

关键词： carbon nanotubes composites mechanical properties multi-function

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装甲车辆悬挂系统刚度阻尼快速匹配研究

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车辆与动力技术 2024年第1期 37-40页

作者：唐志勇杨旭雷旭东冯洁陈留重庆铁马工业集团有限公司重庆400050

目前国内对于轮式装甲车悬挂系统刚度和阻尼的匹配研究主要通过经验法和试验法,该方法费时费力,拉长了装甲车辆的研制周期.为了提高了车辆平顺性,缩减研发时间,本文基于单轮二自由度行驶振动模型,分析了悬挂刚度和阻尼对车身加速度响应... 详细信息

目前国内对于轮式装甲车悬挂系统刚度和阻尼的匹配研究主要通过经验法和试验法,该方法费时费力,拉长了装甲车辆的研制周期.为了提高了车辆平顺性,缩减研发时间,本文基于单轮二自由度行驶振动模型,分析了悬挂刚度和阻尼对车身加速度响应影响,推导了加速度、悬挂动挠度和车轮动载荷均方根值的一般计算公式,建立了基于行驶安全性和舒适性的悬挂系统最佳阻尼比数学模型,完成了某型装甲车悬挂系统阻尼比设计.结果表明该方法可以快速准确的完成悬挂系统刚度阻尼匹配设计,缩短了车辆设计研发时间.

关键词：悬挂系统幅频特性刚度阻尼舒适性安全性

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Pore Formation Mechanism in W-C Hard Coatings Using Directed Energy Deposition on Tungsten Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 89-101页

作者： Xinrui Zhang Weijie Fu Chen Wang Zhenglong lei Haoran Sun xudong Li State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China

Porosity is a common phenomenon and can significantly hinder the quality of the ***,the pore formation mechanism and the characteristics of the single tracks of the W-C coating using directed energy deposition(DED)are systematically *** forming quality of the tracks,the distribution of the pores,and the elemental distribution near the pores are analyzed by the observations of the cross-sections of the *** temperature field of the melt pool is discussed comprehensively to reveal the pore formation *** results confirm that Ni and Co evaporated during the DED process due to the high temperature of the melt *** were continuously produced adjacent to the fusion line when the melt pool was about to solidify since the temperature at the solidification front was higher than the boiling point of *** vaporization area at the fusion line was proposed,where Ni could also evaporate at the time the melt pool started to *** relationship between the solidification rate,the size of the vaporization area and the DED parameters(laser power and scanning speed)was established to discuss the causes of severe pores above the fusion *** work contains a practical guide to reduce or eliminate the porosity in the coating preparation process on the surface of the tungsten alloy.

关键词： Directed energy deposition(DED)process Tungsten alloy W-C coating Pores Binder phase

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Unidirectional movement behavior of underwater bubbles on the wettability gradient mesh via asymmetrical bounce

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Science China Chemistry 2024年第8期67卷 2606-2613页

作者： Yuzhen Ning Zhihong Zhao Shuang Ben Qiang Li Cunming Yu xudong Zhang Huawei Chen Kesong Liu lei Jiang School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology School of ChemistryBeihang UniversityBeijing 100191China Research Institute of Aero-Engine Beihang UniversityBeijing 100191China School of Materials Science and Engineering Shenyang Ligong UniversityShenyang 110159China Tianmushan Laboratory Hangzhou 310023China The Analysis Testing CenterBeihang UniversityBeijing 100191China

The impact of underwater bubbles on solid surfaces with a gradient wettability is important for fundamental science and technological applications. Despite progress in the translational motion of underwater bubbles on asymmetric surface, a fundamental dynamic understanding of asymmetrical bounce behavior of the underwater bubble needs to be further ***, we investigate asymmetrical bounce of underwater bubbles after impacting the wettability gradient copper mesh *** bounce of the underwater bubble on the wettability gradient mesh(WGM) surface is composed by asymmetrical spread in the spread process and asymmetrical recoil in the recoil process, which induce the unidirectional movement ***, effective bubble-size manipulation can be easily implemented due to different volumes of bubbles remaining at different locations of WGM surface. We envision that this work will provide a new understanding of asymmetrical bounce behavior of the underwater bubble on the wettability gradient surface, and propose a novel and feasible strategy for constructing the underwater bubble manipulation system.

关键词： asymmetrical bounce unidirectional movement behavior gradient wettability

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Research and development of prevention and control measures on the transmission of pathogens in compartments of passenger transport

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Transportation Safety and Environment 2024年第1期6卷 1-7页

作者： Hongqi Tian Tiantian Wang lei Xu Miao Sha Shujun Chen Zeyun Yang Yan Zhu Dawei Chen Hengkui Li lei Zhang Bosen Qian xudong Tian Key Laboratory of Traffic Safety on Track of Ministry of Education School of Traffic&Transportation EngineeringCentral South UniversityChangshaHunan 410075China CRRC Qingdao Sifang Co. Ltd.QingdaoShandong 266111China CRRC Changchun Railway Vehicles Co. Ltd.ChangchunJilin 130062China CRRC Tangshan Co. Ltd.TangshanHebei 064000China CRRC Industrial Research Institute(Qingdao)Co. Ltd.QingdaoShandong 266109China

Contagious pathogens like COVID-19 transmitted via respiratory droplets spread effortlessly in the passenger compartments of transport,significantly jeopardizing passengers’safety when taking public *** date,studies on the fundamental theories of airborne droplet transmission and the engineering application of decontamination techniques are insufficient for the prevention and control of pathogens transmitting in the compartments of passenger *** is essential to systematically investigate the control approaches to restrain pathogens from transmitting in passenger ***,a theoretical framework for calculating the transmission of pathogens in a complex compartment environment was proposed,and experimental platforms that satisfy the Biosafety Level-2 Laboratory safety level for compartment environment simulations were built based on a set of real train *** these bases,numerical investigations on the motion of pathogen-laden droplets were conducted,and decontamination techniques were examined ***,control measures on the pathogen transmission and pathogen decontamination schemes were ***,highly efficient decontamination devices were developed,and coping strategies for epidemic emergencies were *** outcomes provide theoretical and technical support for developing the next generation of transportation and the prevention and control measures cooperatively considering regular and pandemic times.

关键词： contagious pathogen airborne transmission passenger compartment of transport decontamination technique

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基于手机的声学超宽带室内定位

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电讯技术 2016年第4期56卷 436-442页

作者：雷旭东禹健中北大学计算机与控制工程学院太原030051

针对室内定位技术部署复杂、成本高的问题,提出了一种利用手机接收声学信号通过脉冲压缩进行室内定位的方法。通过借鉴雷达系统中的脉冲压缩技术,将信号和噪声分离,并提取出信号到达时延估计。为了减小定位误差,研究了手机的声学特性,... 详细信息

针对室内定位技术部署复杂、成本高的问题,提出了一种利用手机接收声学信号通过脉冲压缩进行室内定位的方法。通过借鉴雷达系统中的脉冲压缩技术,将信号和噪声分离,并提取出信号到达时延估计。为了减小定位误差,研究了手机的声学特性,设计了声学超宽带信号的信道模型,将应答节点时延回传,进一步减小信号传播的时延估计。在停车场的试验结果表明:定位结果和实际位置相符,平均定位误差在30 cm以内。

关键词：超宽带室内定位脉冲压缩延时估计信道模型匹配滤波

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Advancements in life-on-a-chip: The impact of “Beyond Limits Manufacturing” technology

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Chinese Chemical Letters 2024年第5期35卷 13-16页

作者： Weiwei He Hongbo Zhang xudong Lin Lili Zhu Tingting Zheng Hao Pei Yang Tian Min Zhang Guoyue Shi lei Wu Jianlong Zhao Gulinuer Wumaier Shengqing Li Yufang Xu Honglin Li Xuhong Qian Shanghai Key Laboratory of New Drug Design School of PharmacyEast China University of Science and TechnologyShanghai 200237China School of Mechanical and Power Engineering East China University of Science and TechnologyShanghai 200237China Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument School of Biomedical EngineeringShenzhen Campus of Sun Yat-sen UniversityShenzhen 518000China Shanghai Key Laboratory of Green Chemistry and Chemical Processes Department of ChemistrySchool of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200241China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China Department of Pulmonary and Critical Care Medicine Huashan HospitalFudan UniversityShanghai 200040China Innovation Center for AI and Drug Discovery East China Normal UniversityShanghai 200062China Lingang Laboratory Shanghai 200031China

This review explores the concept of life-on-a-chip,which involves the creation of miniaturized biological systems,such as organs,tissues,and model organisms,on microscale platforms called microfluidic *** chips consist of intricately etched channels,wells,and chambers that enable precise control and observation of fluids,cells,and biochemical reactions,facilitating the simulation of various aspects of human or animal physiology and the study of responses to different stimuli,drugs,or disease *** review highlights the application of a novel technology,“Beyond Limit Manufacturing”(BLM),in the development of sophisticated three-dimensional cell models and model organism ***-on-a-chip and organ-on-a-chip(OoC)are among the thriving developments in the field of microfluidics,allowing for the reconstruction of living microenvironments and implementation of multiple *** review discusses the latest advancements in life-on-a-chip technology using BLM and outlines potential future research directions,emphasizing the significant role of these chips in studying complex biological processes in a controlled and scalable manner.

关键词： Beyond Limit Manufacturing Model-organism-on-a-chip Organ-on-a-chip

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中华口腔医学会口腔颌面创伤及正颌专业委员会第三次学术会议纪要

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中华口腔医学杂志 2024年第3期59卷 288-289页

作者：张雷田磊王旭东上海交通大学医学院附属第九人民医院颅颌面科、上海交通大学口腔医学院、国家口腔医学中心、国家口腔疾病临床医学研究中心、上海市口腔医学重点实验室、上海市口腔医学研究所上海200011 第四军医大学口腔医院颌面创伤正颌外科、口颌系统重建与再生全国重点实验室、国家口腔疾病临床医学研究中心、陕西省口腔疾病临床医学研究中心西安710032

由中华口腔医学会口腔颌面创伤及正颌专业委员会主办、第四军医大学口腔医院承办的中华口腔医学会口腔颌面创伤及正颌专业委员会第三次学术会议于2023年10月26—28日在西安国际会展中心成功举办。本次会议由中华口腔医学会口腔颌面创伤... 详细信息

由中华口腔医学会口腔颌面创伤及正颌专业委员会主办、第四军医大学口腔医院承办的中华口腔医学会口腔颌面创伤及正颌专业委员会第三次学术会议于2023年10月26—28日在西安国际会展中心成功举办。本次会议由中华口腔医学会口腔颌面创伤及正颌专业委员会与口腔正畸专业委员会联合举办,不仅开创了专业委员会联合举办学术年会的先河,促进了两大学科在正畸-正颌联合治疗领域的交叉融合,更进一步推进了两大学科的全方位合作与交流。

关键词：中华口腔医学会口腔颌面创伤口腔医院第四军医大学正颌学术会议纪要交叉融合合作与交流

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一种混沌鲸鱼-旗鱼复合型算法的永磁同步电机PI控制

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现代制造工程 2022年第12期 125-130,143页

作者：胡启国王泽霖陈思祥雷旭东重庆交通大学机电与车辆工程学院重庆400074 宝鸡石油机械有限责任公司宝鸡721002 重庆铁马工业集团有限公司重庆400050

针对永磁同步电机PI控制参数凭经验设定易造成较大的控制误差等问题,提出了一种基于混沌鲸鱼-旗鱼复合型算法的永磁同步电机PI控制参数优化方法。集鲸鱼算法与旗鱼算法为一体,设计了一种复合型算法:该算法中,鲸鱼算法被用作局部搜索,为... 详细信息

针对永磁同步电机PI控制参数凭经验设定易造成较大的控制误差等问题,提出了一种基于混沌鲸鱼-旗鱼复合型算法的永磁同步电机PI控制参数优化方法。集鲸鱼算法与旗鱼算法为一体,设计了一种复合型算法:该算法中,鲸鱼算法被用作局部搜索,为进一步增强算法的局部寻优能力,在鲸鱼算法中提出双向螺旋更新策略并融入黄金正弦算法;旗鱼算法被用作全局搜索,为进一步提高算法的全局寻优能力,引入灰狼算法的等级制度于旗鱼算法;采用分段混沌映射法初始化算法种群,以使种群具有多样性。通过优化永磁同步电机PI控制参数得出的结果表明:相比采用凭经验设定及经其他算法优化PI控制参数,采用复合型算法优化的PI控制参数的永磁同步电机明显改善了系统的稳态抖振、收敛能力及抗干扰能力等。

关键词：复合型算法鲸鱼算法旗鱼算法分段混沌映射永磁同步电机 PI控制

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基于MATLAB的非独立悬架振动特性分析

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重庆交通大学学报（自然科学版） 2012年第1期31卷 133-136页

作者：胡启国王文静孙宝贤雷旭东重庆交通大学机电与汽车工程学院重庆400074

为研究非独立悬架在路面行驶时外界环境对车身振动响应的影响,建立了简化的四自由度1/2车辆悬架系统的线性模型;运用随机振动的基本理论,以路面不平度的功率谱密度为输入分析路面不平度等级、行驶车速和车身质量对车身振动的影响。通过M... 详细信息

为研究非独立悬架在路面行驶时外界环境对车身振动响应的影响,建立了简化的四自由度1/2车辆悬架系统的线性模型;运用随机振动的基本理论,以路面不平度的功率谱密度为输入分析路面不平度等级、行驶车速和车身质量对车身振动的影响。通过MATLAB实例分析,表明车身振动随车速和路面不平度的增加而增大,在不超载的情况下提高承载质量有利于减小车身的振动。

关键词： matlab 路面不平度振动模型非独立悬架

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