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Collision Direction Dependence of React ion Channels and Reaction Products in Molecular Collisions Between Two C_(60) Molecules

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Chinese Physics Letters 1997年第12期14卷 893-896页

作者： ZHANG Zhao-lin LIANG Qi-min MU Yu-guang XIA Yue-yuan Department of Physics Shandong UniversityJi’nan 250100

The reaction channels and the reaction products in the collisional reactions between two C60 molecules are found to be sensitively dependent on the relative orientation between the colliding *** detailed collision processes and the stable structures of the products are studied by using a molecular dynamics simulation method combined with a Langevin molecular dynamics *** defects of the reaction products are also analyzed.

关键词： scheme C60 collision

Deformation Characteristics of Semi-Solid High Carbon Tool Steel

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Journal of Iron and Steel Research International 2004年第5期11卷 i006-i007页

作者： LIJi-guang KANGYong-lin ZHAOAi-min YUHao UniversityofScienceandTechnologyBeijing Beijing100083China

Design and application of copper/lithium composite anodes for advanced lithium metal batteries

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Rare Metals 2024年第3期43卷 942-970页

作者： Bin Zhang Ji-Ping Ma Yang Zhao Tong Li Jin-lin Yang Zhan-ling Zhang Shi-Zhong Wei guang-min Zhou School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471003China Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore Shenzhen Geim Graphene Center Tsinghua-Berkeley Shenzhen InstituteTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China

Lithium(Li)is a promising candidate for nextgeneration battery anode due to its high theoretical specific capacity and low reduction ***,safety issues derived from the uncontrolled growth of Li dendrite and huge volume change of Li hinder its practical application.C onstructing dendrite-free composite Li anodes can significantly alleviate the above ***(Cu)-based materials have bee n widely used as substrates of the composite electrodes due to their chemical stability,excellent conductivity,and good mechanical ***/lithium(Cu/Li)composite anodes significantly regulate the local current density and decrease Li nucleation overp otential,realizing the uniform and dendrite-free Li *** this review,Cu/Li composite methods including electrodeposition,melting infusion,and mechanical rolling are systematically summarized and ***,design strategies of Cu-based current collectors for high performance Cu/Li composite anodes are *** challenges and future development for Cu/Li composite anodes are presented and *** hope that this review can provide a comprehensive understanding of Cu/Li composite methods of the latest development of Li metal anode and stimulate more research in the future.

关键词： Lithium metal batteries Cu/Li composite anode Electrodeposition Thermal melting infusion Mechanical rolling

Effect of inoculation with arbuscular mycorrhizal fungi on the degradation of DEHP in soil

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Journal of Environmental Sciences 2004年第3期16卷 458-461页

作者： WANGShu-guang linXian-gui YINRui HOUYan-lin ResearchCenterforEco-EnvironmentalSciences.ChimeseAcademyofSciences.Beijing100085.China InstituteofSoilScience ChineseAcademyofSciences.Naujing210008.China

The effect of inoculation with arbuscular mycorrhizal(AM) fungi( Acaulospora lavis ) on the degradation of di(2 ethylhexyl) phthalate(DEHP) in soil was studies. Cowpea plants (Pigna sinensis) were used as host plants and grown in a specially designed rhizobox. The experimental results indicated that, both in sterile and non sterile soil, mycorrhizal colonization rates were much higher in the mycorrhizal plants than in the non mycorrhizal plants. Addition of 4 mg/kg DEHP slightly affected mycorrhizal colonization, but the addition of 100 mg/kg DEHP significantly decreased mycorrhizal colonization. DEHP degradation in the mycorrhizosphere(Ms) and hyphosphere(Hs), especially in the Hs, increased after inoculation with Acaulospora lavis . It is concluded that mycorrhizal hyphae play an important role in the plant uptake, degradation and translocation of DEHP. The mechanism might be attributed to increased numbers of bacteria and actinomycetes and activity of dehydrogenase, urease and acid phosphatase in the Ms and Hs by mycorrhizal fungi.

关键词： AM fungi inoculation DEHP concentration degradation

Hybrid intelligent PID control design for PEMFC anode system

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第4期9卷 552-557页

作者： Rui-min WANG Ying-ying ZHANG guang-yi CAO Fuel Cell Institute Department of Automation Shanghai Jiao Tong University Shanghai 200030 China Institute of Oceanographic Instrument Shandong Academy of Science Qingdao 266001 China

Control design is important for proton exchange membrane fuel cell (PEMFC) generator. This work researched the anode system of a 60-kW PEMFC generator. Both anode pressure and humidity must be maintained at ideal levels during steady operation. In view of characteristics and requirements of the system, a hybrid intelligent PID controller is designed specifically based on dynamic simulation. A single neuron PI controller is used for anode humidity by adjusting the water injection to the hydrogen cell. Another incremental PID controller, based on the diagonal recurrent neural network (DRNN) dynamic identification, is used to control anode pressure to be more stable and exact by adjusting the hydrogen flow rate. This control strategy can avoid the coupling problem of the PEMFC and achieve a more adaptive ability. Simulation results showed that the control strategy can maintain both anode humidity and pressure at ideal levels regardless of variable load, nonlinear dynamic and coupling characteristics of the system. This work will give some guides for further control design and applications of the total PEMFC generator.

关键词： Proton exchange membrane fuel cell (PEMFC) Anode system Single neuron Diagonal recurrent neural network (DRNN) PID controller

Microstructure and mechanical properties of WC-Co-based cemented carbide with bimodal WC grain size distribution

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Rare Metals 2023年第8期42卷 2809-2815页

作者： Rui-Jun Cao Chen-guang lin Xing-Cheng Xie Zhong-Kun lin Powder Metallurgy and Special Materials Department General Research Institute for Nonferrous MetalsBeijing 100088China

In order to improve the wear resistance of coarse-grained WC-Co cemented carbides,the fine WC powder were used to reinforce the metallic *** WC-Co-based cemented carbides having bimodal WC grain size distributions were synthesized by liquid phase *** comparison,the cemented carbides having unimodal WC grain size distributions were *** microstructure,hardness,fracture toughness and wear resistance of these cemented carbides were *** results show that adding fine WC powder is an effective method to improve the wear resistance of coarsegrained WC-Co cemented *** WC size,mean free path and fracture toughness decrease with the addition of fine WC powder,while the hardness exhibits an opposite *** impact-wear coefficient of bimodal distribution cemented carbides is noticeably lower than that of the unimodal one with the same hardness,which means that the cemented carbides with bimodal grain structure have better combination of hardness and impact-abrasive wear *** impact-abrasive wear mechanism of the bimodal cemented carbides is that the fine WC grains prevent abrasive wear and the coarse WC grains prevent impact wear.

关键词： WC-Co cemented carbide Impact wearing Bimodal distribution Hardness Mean free path

Every Graph Embedded on the Surface with Euler Characteristic Numberε=-1 is Acyclically 11-choosable

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Acta Mathematica Sinica,English Series 2023年第11期39卷 2247-2258页

作者： lin SUN guang Long YU Xin LI School of Mathematics and Statistics Lingnan Normal UniversityZhanjiang 524000P.R.China

A proper vertex coloring of a graph G is acyclic if there is no bicolored cycles in G.A graph G is acyclically k-choosable if for any list assignment L={L(v):v∈V(G)}with|L(v)|≥k for each vertex v∈V(G),there exists an acyclic proper vertex coloringφof G such thatφ(v)∈L(v)for each vertex v∈V(G).In this paper,we prove that every graph G embedded on the surface with Euler characteristic numberε=-1 is acyclically 11-choosable.

关键词： Acyclic coloring choosability graphs embedded on the surface Euler characteristic number

New hybrid model of proton exchange membrane fuel cell

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第5期8卷 741-747页

作者： WANG Rui-min CAO guang-yi ZHU Xin-jian Institute of Fuel Cell Department of Automation Shanghai Jiao Tong University Shanghai 200240 China

Model and simulation are good tools for design optimization of fuel cell systems. This paper proposes a new hybrid model of proton exchange membrane fuel cell (PEMFC). The hybrid model includes physical component and black-box com-ponent. The physical component represents the well-known part of PEMFC, while artificial neural network (ANN) component estimates the poorly known part of PEMFC. The ANN model can compensate the performance of the physical model. This hybrid model is implemented on Matlab/Simulink software. The hybrid model shows better accuracy than that of the physical model and ANN model. Simulation results suggest that the hybrid model can be used as a suitable and accurate model for PEMFC.

关键词： Proton exchange membrane fuel cell (PEMFC) Artificial neural network (ANN) Hybrid model Physical model

Visible light induced photodegradation of organic pollutants on nitrogen and fluorine co-doped TiO_2 photocatalyst

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Journal of Environmental Sciences 2005年第1期17卷 76-80页

作者： WANGZheng-peng XUJun CAIWei-min ZHOUBao-xue HEZheng-guang CAIChun-guang HONGXiao-ting SchoolofEnvironmentalScienceandEngineering ShanghaiJiaotongUniversityShanghai200240China

The nitrogen and fluorine co doped TiO 2 polycrystalline powder was synthesized by calcinations of the hydrolysis product of tetra butyl titanate with ammonium fluoride. Nitrogen and fluorine co doping causes the absorption edge of TiO 2 to shift to a lower energy region. The photocatalytic activity of co doped TiO 2 with anatase phases was found to be 2 4 times higher than that of the commercial TiO 2 photocatalyst Degussa P25 for phenol decomposition under visible light irradiation. The co doped TiO 2 powders only contain anatase phases even at 1000℃. Apparently, ammonium fluoride added retarded phase transformation of the TiO 2 powders from anatase to rutile. The substitutional fluorine and interstitial nitrogen atoms in co doped TiO 2 polycrystalline powder were responsible for the vis light response and caused the absorption edge of TiO 2 to shift to a lower energy region.

关键词： photocatalyst visible light nitrogen and fluorine co-doped phenol band gap