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A highly sensitive breathable fuel cell gas sensor with nanocomposite solid electrolyte

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InfoMat 2019年第2期1卷 234-241页

作者： Jing Zhang gaopeng jiang Timothy Cumberland Pan Xu Yalin Wu Stephen Delaat Aiping Yu Zhongwei Chen Department of Chemical Engineering Waterloo Institute for NanotechnologyWaterloo Institute of Sustainable EnergyUniversity of WaterlooWaterlooOntarioCanada

The present work deals with a poly(vinyl alcohol)-based membrane mixed with poly(4-styrenesulfonic acid)to be used as a proton-conducting solid-state electrolyte in an electrochemical gas sensor for the detection of alcohol.A cross-linking bonding semi-interpenetrating network is formed between the polymer backbones,providing the membrane with superior mechanical property and excellent water ***,the graphene oxide nanosheets are incorporated into the polymer fibrous backbones,creating impermeable block layers to limit ethanol gas ***,the modification of graphene oxide facilitates the protons transportation in both in-plane and through-plane channels of the membrane,boosting excellent conductivities of 0.13 S cm^−1(in-plane)and 22.6 mS cm^−1(through-plane)at 75C,*** alcohol fuel cell sensor assembled with this semi-interpenetrating network solid electrolyte membrane is fabricated based on direct ethanol fuel cell principle,exhibiting excellent sensitivity,linearity,as well as low ethanol detection limits of 25 ppm.

关键词： electrochemical gas sensor gel polymer graphene oxide proton conductivity solid electrolyte

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RS-SVM组合模型下煤矿安全风险预测

中国矿业大学学报 2017年第2期46卷 423-429页

作者：汪莹蒋高鹏中国矿业大学(北京)管理学院北京100083

针对煤矿安全风险预测的可靠性与效率问题,构建了基于粗集-支持向量机(RS-SVM)的煤矿安全风险预测模型.在不改变样本分类质量的条件下,运用RS方法作为预处理器约简特征参数,然后基于SVM方法进行分类建模.以煤矿瓦斯爆炸风险预测为例,从... 详细信息

针对煤矿安全风险预测的可靠性与效率问题,构建了基于粗集-支持向量机(RS-SVM)的煤矿安全风险预测模型.在不改变样本分类质量的条件下,运用RS方法作为预处理器约简特征参数,然后基于SVM方法进行分类建模.以煤矿瓦斯爆炸风险预测为例,从人员、环境、设备及管理4方面建立煤矿安全生产预警指标体系.利用遗传算法进行RS粗糙集属性约简,将初始风险因子由31项剔除为5项.将得到的约简集作为新的论域,并基于约简集利用SVM进行样本训练,通过回判法对30个训练样本的计算结果进行验证,得出SVM模型精确可靠的结论.进而利用5个预测样本得到其2015年瓦斯爆炸的风险预测结果,与实际情况完全相符.表明本文建立的RS-SVM组合预测模型对煤矿安全风险预测具有良好的指导作用.

关键词：粗集遗传算法属性约简 RS-SVM 风险预测

基于网络数据包络分析的煤矿开采与环境治理效率评估

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中国矿业大学学报 2018年第2期47卷 421-428页

作者：汪莹蒋高鹏刘佳中国矿业大学(北京)管理学院北京100083

针对煤矿开采与环境治理效率问题,将煤矿运行系统划分为开采系统子系统与环境治理子系统,选用数据包络分析(DEA)模型,通过设计煤矿生产系统的框架结构来构建了两阶段的煤矿运行系统的网络DEA评价模型.根据设计的开采与环境治理两阶段效... 详细信息

针对煤矿开采与环境治理效率问题,将煤矿运行系统划分为开采系统子系统与环境治理子系统,选用数据包络分析(DEA)模型,通过设计煤矿生产系统的框架结构来构建了两阶段的煤矿运行系统的网络DEA评价模型.根据设计的开采与环境治理两阶段效率评价指标体系,对30家样本煤矿企业的开采效率与环境治理效率进行评估,得出两阶段各个样本企业的具体效率评价值,并依据两阶段效率评价值将我国煤矿企业分为3类:两阶段均为有效、开采阶段有效而环境治理阶段无效、开采效率大幅低于环境治理效率.进一步通过DEA模型的计算得到各评价样本具体指标的规模收益参数、每个投入指标的径向改进值、松弛变量改进值及相关指标的目标值,为我国煤炭开采与环境治理投入提供科学决策.

关键词：网络DEA 煤矿开采环境治理效率评估

“一带一路”倡议下中国煤炭资源协同开发策略研究

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国际贸易 2019年第6期 87-96页

作者：蒋高鹏童磊芦翠杰中国矿业大学(北京)管理学院

随着“一带一路”倡议实施的不断深化,各国之间的经济合作与贸易规模不断扩张,全球能源消费格局也逐渐演变和调整。统计数据显示,世界能源消费中心正快速向“一带一路”沿线国家转移,而沿线国家能源消费结构长期以煤炭为主并有增长势头... 详细信息

随着“一带一路”倡议实施的不断深化,各国之间的经济合作与贸易规模不断扩张,全球能源消费格局也逐渐演变和调整。统计数据显示,世界能源消费中心正快速向“一带一路”沿线国家转移,而沿线国家能源消费结构长期以煤炭为主并有增长势头,这一趋势给我国煤炭资源发展既带来了机遇也带来了挑战,为了提升我国煤炭行业的全球化发展水平,必须在“一带一路”倡议的基础上,制定我国煤炭行业的协同开发策略,这对我国推动能源供给侧改革,促进国内能源转型有重要的战略意义。

关键词：一带一路煤炭资源协同开发

Effective inhibition of anomalous grain coarsening in cast AZ91 alloys during fast cooling via nanoparticle addition

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Journal of Magnesium and Alloys 2023年第12期11卷 4575-4588页

作者： Haonan Li Kui Wang gaopeng Xu Haiyan jiang Qudong Wang Yingxin Wang National Engineering Research Center of Light Alloy Net FormingShanghai Jiao Tong University200240ShanghaiP.R.China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University200240ShanghaiP.R.China

In this work, the effects of Ti CN and γ-Al_(2)O_(3) nanoparticle(NP) addition on the microstructural evolution of cast AZ91 alloys at the cooling rate ranging from 15 to 120 K/s have been systematically investigated. Experimental results reveal that grain coarsening occurs in cast AZ91 alloys when the cooling rate exceeds 90 K/s, while it can be effectively inhibited upon addition of NPs. The marked inhibition effect may originate from the formation of Ti CN or γ-Al_(2)O_(3) NP-induced undercooling zone ahead of solid/liquid(S/L) front of α-Mg, which not only can restrict grain growth effectively, but also can reactivate the native nucleants that are inactive in AZ91 melts to participate in nucleation events. And if possessing high nucleation potency, NPs can also promote further nucleation events and lead to significant grain refinement. An analytical model has been established to quantitatively account for the restriction effect of NPs on grain growth. The present work may shed a new light on the grain coarsening of cast alloys during fast cooling and provide an effective approach to circumvent it.

关键词： Grain coarsening Nanoparticles Undercooling zone Fast cooling

Development of a low-frequency magnetic lightning mapping system(LFM-LMS)in North China:validation and preliminary results

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Earth and Planetary Physics 2023年第4期7卷 460-470页

作者： Xiao Li gaopeng Lu FanChao Lyu HongBo Zhang Kainat Qamar RuBin jiang School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Key Laboratory of Atmospheric Optics Anhui Institute of Optics and Fine MechanicsHFIPSChinese Academy of SciencesHefei 230031China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjing 210044China Key Laboratory of Transportation Meteorology of China Meteorological Administration Nanjing Joint Institute for Atmospheric SciencesNanjing 210000China Key Laboratory for Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

A low-frequency magnetic lightning mapping system(LFM-LMS)was built during the SHAndong Triggered Lightning Experiment(SHATLE),based on continuous measurements of magnetic field radiation from *** hardware and source-mapping techniques used by the LFM-LMS were introduced;both Monte Carlo simulations and the observation of rocket-triggered lightning examples were employed to examine the location accuracy and detection effectiveness of the *** estimated that the system’s location accuracy about 100−200 m horizontally and~200 m vertically.A natural intra-cloud lightning flash and a rocket-triggered lightning flash,both with intricate structures and discharging processes,were examined using the three-dimensional mapping *** progressing path of negative lightning leaders is usually well-defined,and its propagation speed is estimated to be(0.5−1.4)×10^(6)m/*** summary,the LFM-LMS can reconstruct the three-dimensional morphology of lightning flashes;this technology provides a efficient method for investigating the characteristics of lightning development,as well as the overall electrical strucuture of thunderstorms.

关键词： rocket-triggered lightning low-frequency magnetic field lightning mapping observation location accuracy

Review on corrosion resistance of mild steels in liquid aluminum

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Journal of Materials Science & Technology 2021年第12期71卷 12-22页

作者： gaopeng Xu Kui Wang Xianping Dong Lei Yang Mahmoud Ebrahimi Haiyan jiang Qudong Wang Wenjiang Ding National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Key Laboratory of High Temperature Materials and Precision Forming Shanghai Jiao Tong UniversityShanghai 200240China Nano Life Science Institute(WPI-NanoLSI) Kanazawa UniversityKakuma-machiKanazawa 920-1192Japan COMP Centre of Excellence Department of Applied PhysicsAalto UniversityHelsinki FI-00076Finland

The corrosion of mild steels by liquid aluminum is an intractable issue in aluminum *** review aims to provide an overview of the corrosion behavior of mild steels in the static liquid aluminum with an emphasis on the thermodynamic and kinetic *** corrosion mechanisms of mild steels in liquid aluminum are discussed systematically,based on which four corrosion control approaches including alloying,introducing secondary phase,matrix microstructure control and surface treatment are ***,a combination of improvement approaches may have a great potential for further enhancement in corrosion resistance.

关键词： Corrosion resistance Liquid aluminum Mild steel Microstructure Control Surface treatment

Nano-mechanical and tribological properties of copper matrix composites reinforced by graphene nanosheets

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Progress in Natural Science:Materials International 2018年第4期28卷 416-421页

作者： Xiancong He gaopeng Zou Yongxiang Xu Haochun Zhu Hao jiang Xiaofan jiang Wei Xia Jingtao Chen Jiawei Wu Shaofeng Yang jiangsu Key Laboratory of Advanced Structural Materials and Application Technology and School of Materials Science and Engineering Nanjing Institute of Technology

The impacts of graphene nanosheets content on microstructure, nano-mechanical and tribological properties of the copper matrix composites were investigated. The graphene nanosheets randomly distributed in copper matrix, which obviously hindered its grain growth. The elastic modulus and nano-hardness of the copper matrix composite with 0.2 wt% graphene nanosheets were enhanced 47.5% and 54.7% compared to these of pure copper, respectively. The average creep degree(5.1%) was lower than that(11.8%) of pure copper in holding stage. The creep rate(ca. 0.016 nm/s) decreased 10 times as that(ca. 0.16 nm/s) of pure copper in steady-state creep. The tribological performances were improved dramatically with increase of graphene nanosheets content.

关键词： Copper matrix composites Graphene nanosheets Nano-mechanical properties

In-Situ Synthesis of CQDs/BiOBr Material via Mechanical Ball Milling with Enhanced Photocatalytic Performances

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Chinese Journal of Structural Chemistry 2022年第8期41卷 44-51页

作者： Xingwang Yan Bin Wang Mengxia Ji Qi jiang gaopeng Liu Pengjun Liu Sheng Yin Huaming Li Jiexiang Xia Key Laboratory of Medicinal and Edible Plants Resources of Hainan Province Hainan Vocational University of Science and TechnologyHaikou 571126China School of Chemistry and Chemical Engineering Institute for Energy ResearchJiangsu UniversityZhenjiang 212013China

Designing simple, efficient, and environmentally friendly methods to construct high-efficient photocatalysts is an important strategy to promote the further development of the field of photocatalysis. Herein, flower-like carbon quantum dots(CQDs)/Bi OBr composite photocatalysts have been prepared via in-situ synthesis by mechanical ball milling in the existence of ionic liquid. The CQDs/Bi OBr composites exhibit higher photo-degradation performance for tetracycline(TC) than Bi OBr monomer and the commercial Bi_(2)O_(3) under visible light irradiation. For comparison, the different Br sources and synthetic methods are chosen to prepare Bi OBr and CQDs/Bi OBr composites. Photocatalysts prepared by ball milling and ionic liquid present significantly enhanced photocatalytic performance for removing TC. In addition, the introduction of CQDs could distinctly enhance the photocatalytic performances of pure Bi OBr. The reason is that CQDs as electron acceptor effectively separate electrons and holes and inhibit their recombination. The intermediates during photocatalytic degradation were tested using liquid chromatography-mass spectrometry(LC-MS) and possible degradation pathways were given. During degradation, ·OH, O_(2)^(·-)and h^(+) were identified to be the main active species based on electron spin resonance(ESR) spectra and free radical trapping experiments. A possible mechanism of CQDs/Bi OBr with enhanced photocatalytic performances was further proposed.

关键词： CQDs BiOBr photocatalysis pollutant degradation