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Facile synthesis of porous nitrogen-doped holey graphene as an efficient metal-free catalyst for the oxygen reduction reaction

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Nano Research 2017年第1期10卷 305-319页

作者： Li Qin Ruimin Ding Huixiang wang Jianghong Wu Conghui wang Chenghua Zhang Yao Xu liancheng wang Baoliang Lv State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030001 China Key Laboratory of Carbon Materials Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030001 China Synfuels China Technology Co. Ltd. Beijing 101407 China State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'an 710119 China University of Chinese Academy of Sciences Beijing 100049 China

Nitrogen-doped graphene is a promising candidate for the replacement of noble metal-based electrocatalysts for oxygen reduction reactions （ORRs）. The addition of pores and holes into nitrogen-doped graphene enhances the ORR activity by introducing abundant exposed edges, accelerating mass transfer, and impeding aggregation of the graphene sheets. Herein, we present a straightforward but effective strategy for generating porous holey nitrogen-doped graphene （PHNG） via the pyrolysis of urea and magnesium acetate tetrahydrate. Due to the combined effects of the in situ generated gases and MgO nanoparticles, the synthesized PHNGs featured not only numerous out-of-plane pores among the crumpled graphene sheets, but also interpenetrated nanoscale （5-15 nm） holes in the assembled graphene. Moreover, the nitrogen doping configurations of PHNG were optimized by post-thermal treatments at different temperatures. It was found that the overall content of pyridinic and quaternary nitrogen positively correlates with the ORR activity; in particular, pyridinic nitrogen generates the most desirable characteristics for the ORR. This work reveals new routes for the synthesis of PHNG-based materials and elucidates the contributions of various nitrogen species to ORRs.

关键词： porous holey N-dopedgraphene in situ templates post-thermal treatment oxygen reduction reaction

Cargo Hold Structure Optimization of Small and Medium-Sized Duplex Stainless Steel Chemical Tankers

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Journal of Shanghai Jiaotong university(Science) 2020年第3期25卷 340-351页

作者： ZHOU Min GAO Mingze LI Chuang wang liancheng Marine Design and Research Institute of China Shanghai 200011China Beijing COSCO SHIPPING Ship Trading Co. Ltd.Beijing 100027China

A mathematical model of optimization for cargo hold structure of small and medium-sized duplex stainless steel (DSS) chemical tankers based on the rule is *** weight of DSS is defined as the objective *** explicit formulas of the relevant rules,the explicit geometric relations formed by the structural arrangement and the implicit constraints such as layout,lines,expert experience,workmanship and so on are taken as the *** design variables and the algorithm are determined by analyzing the logical relations among the ***,the efficiency of the optimum algorithm is improved by utilizing the distribution law of the optimal ***,the comprehensive optimization of the cargo hold DSS is accomplished by C++ *** weight of the optimized scheme of the example is 4.93% lower than that of the original *** finite element analysis results show that the optimized scheme is satisfied with the requirements of the rules and has a good structure *** optimization method based on the rules and accomplished by the programming is practical for structural preliminary design.

关键词： duplex stainless steel(DSS) chemical tanker structure optimization C++programming finite element analysis

Engineering System Theory─A New Engineering Meta-Discipline

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Journal of Systems Engineering and Electronics 1999年第1期10卷 1-3页

作者： wang liancheng(Beijing Institute of Electronic System Engineering, 100854, P. R. China)(Received July 2, 1998) Beijing Institute of Electronic System Engineering 100854 P. R. China

This paper proposes a new engineering disciplin─Engineering System Theory. It dis cusses rendered background, research objects and contents of the engineering system theory briefly. Finally, the met-discipline standing of the engineering system theory in the whole knowledge system of engineering science and its development potential are pointed out.

关键词： Engineering System Discipline Systems theory.

NONSMOOTH MULTIOBJECTIVE PROGRAMMING

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Systems Science and Mathematical Sciences 1994年第4期7卷 362-366页

作者： wang liancheng DONG Jiali LIU Qinghuai(Mathematics Department, Jilin University of Technology, Changchun 130025,China) 吉林工业大学数学系吉林长春

（ｘ）？Ｓ．Ｉｆｇ（ｘ）＝０，Ｓ＊（ｘ）＝Ｓ＊．ＭｏｍｎｉｔＳ／０ａｎｄｎｉｔＳ（ｘ）２ｎｉｔＳ，ｎｉｔＳ（ｘ）／０．Ｈｅｌｌｃｅ（Ｓ（ｘ））＊＝Ｓ＊（ｘ）ｈａｓａｃｏｍｐａｃｔｃｏｎｖｅｘｂａｓｅ，ｄｅｎｏｔ... 详细信息

（ｘ）？Ｓ．Ｉｆｇ（ｘ）＝０，Ｓ＊（ｘ）＝Ｓ＊．ＭｏｍｎｉｔＳ／０ａｎｄｎｉｔＳ（ｘ）２ｎｉｔＳ，ｎｉｔＳ（ｘ）／０．Ｈｅｌｌｃｅ（Ｓ（ｘ））＊＝Ｓ＊（ｘ）ｈａｓａｃｏｍｐａｃｔｃｏｎｖｅｘｂａｓｅ，ｄｅｎｏｔｅｄｂｙＡ，ａｎｄｔｈｅｃｏｍｐａｃｔｃｏｎｖｅｘｂａｓｅｏｆＱ＊ｉｓｄｅｎｏｔｅｄｂｙＢ．｛０｝＊＝Ｒｅ．ＬｅｔＣ＝｛ｘＥＲｅ：ＩＩｘｌｌ＝１｝．ＴｈｅｎＣｉｓａｃｏｍｐａｃｔｂａｓｅｏｆ｛０｝＊．Ｌｅｔｓｕｐｐｏｓｅｔｈａｔ（３ｄＯＥＲ＂）（ＶＰＥＶ＊＼｛０｝）（ＰＴｐ）＂（ｘ；ｄｏ）＜０，ｆｒｏｍＬｅｍｍａ２．３ｔｈｅｒｅｅｄｅｓｔｓａｄＥＲ＂ｔｏｇｅｔｈｅｒｗｉｔｈｂ＞０ｓｕｃｈｔｈａｔＩｎｐａｒｔｉｃｕｌａｒ，ｆｉｘｉｎｇＴＥＢａｎｄＡ６Ａ，ｓｅｔｔｉｎｇｐ￣（ＥＴ，ａｃ，￣）ＥＶ＊ｗｉｔｈＥ＞０ａｎｄｕｅＣ，ｗｅＩｎｄｅｅｄ，ｉｆｔｈｅｒｅｅｘｉｓｔｓａａｌＥ（０，６）ｓｕｃｈｔｈａｔｈ（ｘ＋ａ＇ｄ）／０，ｗｅｃａｎｃｈｏｏｓｅＦＩＥＣｓａｔｉｓｆｙｉｎｇＵ，＂ｈ（ｘ＋ａ＇ｄ）＞０．Ｉｎ（４），ｌｅｔｔｉｎｇＥ－０，ｉｔｆｏｌｌｏｗｓｔｈａｔＵ＂ｈ（ｘ＋ｒｓ＇ｄ）＜０，ｗｈ?

关键词： Nonsmooth multiobjective programming weak minimum necessary and sufficient condition

OPTIMALITY CONDITIONS IN NONSMOOTH MULTIOBJECTIVE PROGRAMMING

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Systems Science and Mathematical Sciences 1994年第3期7卷 250-255页

作者： wang liancheng DONG Jiali LIU Qinghuai (Depertment of Mathematics, Jilin University of Technology, Changchun 130025, China)

ＯＰＴＩＭＡＬＩＴＹＣＯＮＤＩＴＩＯＮＳＩＮＮＯＮＳＭＯＯＴＨＭＵＬＴＩＯＢＪＥＣＴＩＶＥＰＲＯＧＲＡＭＭＩＮＧ￥ＷＡＮＧＬｉａｎｃｈｅｎｇ；ＤＯＮＧＪｉａｌｉ；ＬＩＵＱｉｎｇｈｕａｉ（ＤｅｐｅｒｔｍｅｎｔｏｆＭａｔ... 详细信息

ＯＰＴＩＭＡＬＩＴＹＣＯＮＤＩＴＩＯＮＳＩＮＮＯＮＳＭＯＯＴＨＭＵＬＴＩＯＢＪＥＣＴＩＶＥＰＲＯＧＲＡＭＭＩＮＧ￥ＷＡＮＧＬｉａｎｃｈｅｎｇ；ＤＯＮＧＪｉａｌｉ；ＬＩＵＱｉｎｇｈｕａｉ（ＤｅｐｅｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＪｉｌｉｎＵｎｉ...

关键词： Multiobjective programming generalized gradient separation theorem weak Pareto-efficient solution.

Effect of Current Density on Al Alloy Microplasma Oxidation

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Journal of Materials Science & Technology 2001年第6期17卷 657-660页

作者： Shigang XIN, Zhaohua JIANC, Fuping wang, Xiaohong WU and liancheng ZHAO Harbin Institute of Technology, Harbin 150001, China Tadao SHIMIZU Department of Industrial Chemistry. Chiba Institute of Technology, Japan [Manus Harbin Inst Technol Harbin 150001 Peoples R China Chiba Inst Technol Dept Ind Chem Chiba Japan

The microplasma oxidation process of LY 12 Al alloy in Na2SiO3-KOH-NaAL2 system has been studied. The voltage-time curve of oxidation process is changed with the variation of current ... 详细信息

The microplasma oxidation process of LY 12 Al alloy in Na2SiO3-KOH-NaAL2 system has been studied. The voltage-time curve of oxidation process is changed with the variation of current densities. The voltage breakdown and hardness of coating increase with increasing current density. The phase composition, morphologies, element and the distribution of ceramic coating are investigated by XRD, EPMA.

关键词： Al Cu Effect of Current Density on Al Alloy Microplasma Oxidation

Nonlinear morphological characteristics of debris flow in Dongcheng area of Helong,Jilin

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Global Geology 2009年第4期12卷 221-225页

作者： wang Qian LI Guangjie wang liancheng ZHENG Baigong LIMing College of Construction Engineering Jilin University Changchun 130026 China College of Geoexploration Science ＆ Technology Jilin University Changchun 130026 China Jilin Team of Geological Survey of China Building Materials Industry Changchun 130033 China

Helong City is located in the northeastern Changbai Mountain with a poor geological environment,there often occur debris flows,collapses and landslides;especially debris flows restrict the local economic development. Based on fractal theory and the surveying data of 34 debris flows,the authors studied fractal feature of debris flow gully and its various situations of fractal dimensions in different observation scales. The nonlinear relation reveals the development of non-uniformity and self similarity of debris flow gully.

关键词： debris flow nonlinear fraetal theory self similarity Helong Jilin

Nanohole array structured GaN-based white LEDs with improved modulation bandwidth via plasmon resonance and non-radiative energy transfer

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Photonics Research 2021年第7期9卷 1213-1217页

作者： RONGQIAO WAN GUOQIANG LI XIANG GAO ZHIQIANG LIU JUNHUI LI XIAOYAN YI NAN CHI liancheng wang State Key Laboratory of High Performance Complex Manufacturing College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083China Department of Communication Science and Engineering Key Laboratory for Information Science of Electromagnetic Waves(MoE)Fudan UniversityShanghai 200433China Semiconductor Lighting Technology Research and Development Center Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 101408China

Commercial white LEDs (WLEDs) are generally limited in modulation bandwidth due to a slow Stokes process,long lifetime of phosphors,and the quantum-confined Stark effect. Here we report what we believe is a novel plasmonic WLED by infiltrating a nanohole LED (H-LED) with quantum dots (QDs) and Ag nanoparticles(NPs) together (M-LED). This decreased distance between quantum wells and QDs would open an extra non-radiative energy transfer channel and thus enhance Stokes transfer efficiency. The presence of Ag NPs enhances the spontaneous emission rate significantly. Compared to an H-LED filled with QDs (QD-LED),the optimized M-LED demonstrates a maximum color rendering index of 91.2,a 43% increase in optical power at 60 m A,and a lowered correlated color temperature. Simultaneously,the M-LED exhibits a data rate of 2.21 Gb/s at low current density of 96 A∕cm2(60 m A),which is 77% higher than that of a QD-LED. This is mainly due to the higher optical power and modulation bandwidth of the M-LED under the influence of plasmon,resulting in a higher data rate and higher signal-to-noise ratio under the forward error *** believe the approach reported in this work should contribute to a WLED light source with increased modulation bandwidth for a higher speed visible light communication application.

关键词： transfer radiative white

Phosphor-free single chip GaN-based white light emitting diodes with a moderate color rendering index and significantly enhanced communications bandwidth

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Photonics Research 2020年第7期8卷 1110-1117页

作者： Rongqiao Wan Xiang Gao liancheng wang Shuo Zhang Xiongbin Chen Zhiqiang Liu Xiaoyan Yi Junxi wang Junhui Li Wenhui Zhu Jinmin Li State Key Laboratory of High Performance Complex Manufacturing College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083China Semiconductor Lighting Technology Research and Development Center Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 101408China State Key Laboratory of Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

To achieve high quality lighting and visible light communication(VLC)simultaneously,Ga N based white light emitting diodes(WLEDs)oriented for lighting in VLC has attracted great ***,the overall bandwidth of conventional phosphor converted WLEDs is limited by the long lifetime of phosphor,the slow Stokes transfer process,the resistance-capacitance(RC)time delay,and the quantum-confined Stark effect(QCSE).Here by adopting a self-assembled In Ga N quantum dots(QDs)structure,we have fabricated phosphor-free single chip WLEDs with tunable correlated color temperature(CCT,from 1600 K to 6000 K),a broadband spectrum,a moderate color rendering index(CRI)of 75,and a significantly improved modulation bandwidth(maximum of150 MHz)at a low current density of 72 A∕cm^*** broadband spectrum and high modulation bandwidth are ascribed to the capture of carriers by different localized states of In Ga N QDs with alleviative QCSE as compared to the traditional In Ga N/Ga N quantum well(QW)*** believe the approach reported in this work will find its potential application in Ga N WLEDs and advance the development of semiconductor lighting-communication integration.

关键词： diodes rendering lighting