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Preparation of metal oxide doped ACNFs and their adsorption performance for low concentration SO_2

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International Journal of Minerals,Metallurgy and Materials 2013年第11期20卷 1102-1106页

作者： hong-quan yu Yan-bo Wu Tie-ben Song yue Li yu Shen College of Environmental and Chemical Engineering Dalian Jiaotong University

Metal oxide （TiO2 or Co304） doped activated carbon nanofibers （ACNFs） were prepared by electrospinning. These nanofibers were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and Brunner- Emmett-Teller method （BET）. The results show that the average diameters of ACNFs were within the range of 200-500 nm, and the lengths were several tens of micrometers. The specific surface areas were 1146.7 m2/g for TiO2-doped ACNFs and 1238.5 m2/g for Co304-doped ACNFs, respectively. The electrospun nanofibers were used for adsorption of low concentration sulfur dioxide （SO2）. The results showed that the adsorption rates of these ACNFs increased with an increase in SO2concentration. When the SO2 concentration was 1.0 μg/mL, the adsorption rates of TiO2-doped ACNFs and Co3Oa-doped ACNFs were 66.2% and 67.1%, respectively. The adsorption rate also increased as the adsorption time increased. When the adsorption time was 40 min, the adsorption rates were 67.6% and 69.0% for TiO2-doped ACNFs and Co304-doped ACNFs, respectively. The adsorption rate decreased as the adsorption temperature increased below 60℃, while it increased as the adsorption temperature increased to more than 60℃.

关键词： activated carbon nanofibers metal oxides electrospinning adsorption sulfur dioxide

Preparation of a novel PAN/cellulose acetate-Ag based activated carbon nanofiber and its adsorption performance for low-concentration SO_2

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International Journal of Minerals,Metallurgy and Materials 2015年第4期22卷 437-445页

作者： Yan-bo Wu Jun Bi Ting Lou Tie-ben Song hong-quan yu School of Environmental and Chemical Engineering Dalian Jiaotong University

Polyacrylonitrile （PAN）, PAN/cellulose acetate （CA）, and PAN/CA-Ag based activated carbon nanofiber （ACNF） were prepared using electrostatic spinning and further heat treatment. Thermogravimetrylifferential scanning calorimetry （TG-DSC） analysis indicated that the addition of CA or Ag did not have a significant impact on the thermal decomposition of PAN materials but the yields of fibers could be improved. Scanning electron microscopy （SEM） analysis showed that the micromorphologies of produced fibers were greatly influenced by the viscosity and conductivity of precursor solutions. Fourier transform infrared spectroscopy （FT-IR） analysis proved that a cyclized or trapezoidal structure could form and the carbon scaffold composed of C=C bonds appeared in the PAN-based ACNFs. The characteristic dif- fraction peaks in X-ray diffraction （XRD） spectra were the evidence of a turbostratic structure and silver existed in the PAN/CA-Ag based ACNF. Brurmer-Emmett-Teller （BET） analysis showed that the doping of CA and Ag increased surface area and micropore volume of fi- bers; particularly, PAN/CA-Ag based ACNF exhibited the best porosity feature. Furthermore, SO2 adsorption experiments indicated that all the three fibers had good adsorption effects on lower concentrations of SO2 at room temperature; especially, the PAN/CA-Ag based ACNF showed the best adsorption performance, and it may be one of the most promising adsorbents used in the fields of chemical industry and en- vironment protection.

关键词： activated carbon nanofibers polyacrylonitrile electrospinning adsorption sulfur dioxide

MXene Hybridized Polymer with Enhanced Electromagnetic Energy Harvest for Sensitized Microwave Actuation and Self‑Powered Motion Sensing

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Nano-Micro Letters 2025年第3期17卷 265-279页

作者： yu‑Ze Wang yu‑Chang Wang Ting‑Ting Liu quan‑Liang Zhao Chen‑Sha Li Mao‑Sheng Cao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China School of Materials Science and Engineering Peking UniversityBeijing 100871People’s Republic of China School of Mechanical and Material Engineering North China University of TechnologyBeijing 100144People’s Republic of China Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang UniversityHarbin 150080People’s Republic of China

Polymeric microwave actuators combining tissue-like softness with programmablemicrowave-responsive deformation hold great promise for mobile intelligentdevices and bionic soft robots. However, their application is challenged by restricted electromagneticsensitivity and intricate sensing coupling. In this study, a sensitized polymericmicrowave actuator is fabricated by hybridizing a liquid crystal polymer with Ti3C2Tx(MXene). Compared to the initial counterpart, the hybrid polymer exhibits unique spacechargepolarization and interfacial polarization, resulting in significant improvements of230% in the dielectric loss factor and 830% in the apparent efficiency of electromagneticenergy harvest. The sensitized microwave actuation demonstrates as the shortenedresponse time of nearly 10 s, which is merely 13% of that for the initial shape memory polymer. Moreover, the ultra-low content of MXene (upto 0.15 wt%) benefits for maintaining the actuation potential of the hybrid polymer. An innovative self-powered sensing prototype that combinesdriving and piezoelectric polymers is developed, which generates real-time electric potential feedback (open-circuit potential of ~ 3 mV) duringactuation. The polarization-dominant energy conversion mechanism observed in the MXene-polymer hybrid structure furnishes a new approachfor developing efficient electromagnetic dissipative structures and shows potential for advancing polymeric electromagnetic intelligent devices.

关键词： Microwave absorption Electromagnetic response Energy harvest Self-sensing Soft actuator

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应答器上行链路信号自适应解调方法

交通运输工程学报 2013年第6期13卷 107-112,118页

作者：赵会兵全宏宇梁迪北京交通大学电子信息工程学院北京100044 北京交通大学轨道交通控制与安全国家重点实验室北京100044

分析了应答器上行链路信号特点,提出一种自适应解调方法对上行链路信号进行信号解调。采用自适应LMS算法跟踪上行链路信号的频率,计算跟踪误差,并根据跟踪误差进行信号解调。按照欧洲应答器测试规范对其解调性能进行仿真验证,并与过零... 详细信息

分析了应答器上行链路信号特点,提出一种自适应解调方法对上行链路信号进行信号解调。采用自适应LMS算法跟踪上行链路信号的频率,计算跟踪误差,并根据跟踪误差进行信号解调。按照欧洲应答器测试规范对其解调性能进行仿真验证,并与过零检测法和非相干解调法进行了比较。仿真结果表明:自适应解调方法在上行链路信号参数存在极端偏移时同样能够满足解调性能要求;当信噪比为7dB时,自适应解调方法的误码率接近0,而过零检测法和非相干解调法的误码率分别为0.163、0.001。自适应解调方法实现简单且具有较强的抗干扰能力,为应答器在电磁环境相对恶劣的场所中可靠应用提供基础。

关键词：铁路信号列车运行控制系统应答器上行链路信号自适应解调抗干扰

应答器传输系统的电磁耦合机理及工程安装优化研究

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铁道学报 2014年第5期36卷 64-70页

作者：梁迪赵会兵全宏宇张艳宁北京交通大学轨道交通控制与安全国家重点实验室北京100044 北京交通大学电子信息工程学院北京100044

应答器传输系统是一种基于电磁耦合机理的自动识别系统,目前已广泛应用于国内外的高速铁路及城市轨道交通系统。为了解决应答器传输系统在工程应用中存在的问题(如安装模式优化、系统可靠性等),有必要对该系统的电磁耦合机理做深入的研... 详细信息

应答器传输系统是一种基于电磁耦合机理的自动识别系统,目前已广泛应用于国内外的高速铁路及城市轨道交通系统。为了解决应答器传输系统在工程应用中存在的问题(如安装模式优化、系统可靠性等),有必要对该系统的电磁耦合机理做深入的研究,探究其蕴含磁现象的物理本质。本文深入分析了车载天线与地面应答器之间能量和数据的传输过程,建立了应答器I/O特性、射频磁场分布、信号辐射模式等理论模型,给出了计算应答器作用距离的一般步骤;并在此基础上,研究了地面应答器横向、纵向2种安装模式的本质差异,评估了2种安装模式对不同安装高度、横向偏移的适应性,给出了2种安装模式的优化参数。实测数据与理论分析相符,表明该理论分析方法能够有效地分析应答器系统的物理本质,对于应答器系统的优化、工程安装模式的选择具有一定的指导意义。

关键词：应答器电磁耦合安装模式参数优化

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应答器报文优选及快速编码方法的研究

铁道学报 2015年第2期37卷 52-57页

作者：张艳宁赵会兵全宏宇张菊北京交通大学电子信息工程学院北京100044

应答器是列控系统中用于地-车信息传输的关键设备。本文从降低传输误码率的角度提出连"0/1"个数评分、报文码逻辑"0"和"1"切换频率、同步偏离解析条件、欠采样条件4个报文优选指标,以实现应答器传输报文的优选。通过构造反向查询的字母... 详细信息

应答器是列控系统中用于地-车信息传输的关键设备。本文从降低传输误码率的角度提出连"0/1"个数评分、报文码逻辑"0"和"1"切换频率、同步偏离解析条件、欠采样条件4个报文优选指标,以实现应答器传输报文的优选。通过构造反向查询的字母表、减少检查字母表条件的字数、优选指标与整形约束条件检查同时进行的方式,进一步实现优选报文的快速编码。随机选取武广客运专线真实应答器用户报文进行测试验证。结果表明:根据优选指标能够实现应答器传输报文的优选,采用所提出的快速编码算法生成优选报文的速度比规范定义编码方法提高了97%左右,优选合法报文的误码率明显低于常规合法报文的误码率,满足报文编码的实时性和可靠性的要求。

关键词：应答器报文优选快速编码误码率

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矿用电动机电压波动解决方法

陕西煤炭 2009年第3期28卷 81-82页

作者：全红玉河南省义马煤炭高级技工学校河南义马472300

根据电网电压波动可能对煤矿生产造成较大影响的问题,介绍了煤矿类电动机解决电压波动的方法,并进行了简要分析。

关键词：电网电压波动煤矿用电动机再启动晃电

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斜井提升钢丝绳的损坏及预防

陕西煤炭 2008年第4期27卷 76-77页

作者：全红玉河南省义马高级技工学校河南义马472300

针对斜井提升钢丝绳的损坏特征进行了系统分析,提出了预防保护措施。

关键词：斜井提升钢丝绳损坏保护

基于电接触理论的轨道电路分路电阻计算方法研究

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铁道学报 2014年第3期36卷 31-36页

作者：孙上鹏赵会兵陈德旺全宏宇宁滨北京交通大学轨道交通控制与安全国家重点实验室北京100044 北京交通大学电子信息工程学院北京100044

轨道电路中,分路电阻主要由在轨道上走行车辆的轮对自身材料的电阻和轮轨接触电阻构成。分路不良可严重影响铁路运输的安全和效率,而分路电阻过高是导致分路不良的主要原因。本文基于电接触理论对轮轨接触表面进行分析,提出一种轨道电... 详细信息

轨道电路中,分路电阻主要由在轨道上走行车辆的轮对自身材料的电阻和轮轨接触电阻构成。分路不良可严重影响铁路运输的安全和效率,而分路电阻过高是导致分路不良的主要原因。本文基于电接触理论对轮轨接触表面进行分析,提出一种轨道电路分路电阻的计算方法,并对其变化规律及影响因素进行定量分析。实验结果表明,轮对的材料电阻通常比轮轨接触电阻小得多,因此实际分路电阻可近似为轮轨接触电阻。轮轨接触电阻主要受轮轨间存在的污染膜层的影响,加强对污染膜层特性的研究,对消除分路不良现象有重要的意义。

关键词：轨道电路分路不良接触电阻污染膜层