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Interfacial strengthening and antibacterial behavior in an ultrafine-graine d Zn-Ag-base d biocomposites fabricated by the Cu_(2)O-induced in situ wetting approach

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Journal of Materials Science & Technology 2023年第21期152卷 109-134页

作者： Xiao Wang tongxin di Wei Li Debao Liu Xiaohao Sun School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China School of Chemistry and Chemical Engineering Tianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Function Materials Education Tianjin University of TechnologyTianjin 300384China Tianjin Key Laboratory for Photoelectric Materials and Devices Tianjin 300384China

Nowadays,Zinc(Zn)-based biocomposites as biodegradable implant materials have been recognized as a promising approach to overcome the insufficient mechanical performance of Zn matrix and to endow the Zn-based materials with ***,the strengthening effect on Zn-based matrix compos-ite remains far from expectation mainly due to the poor interfacial bonding between the reinforcement and Zn matrix,and the relatively coarse grain size of the Zn ***,we have developed a novel in situ wetting strategy to ameliorate the interfacial bonding and mechanical performance of Zn-Ag-based composites using cuprous oxide-modified graphene oxide(Cu_(2)O-GO)sheets as *** en-hanced interfacial bonding between GO sheets and Zn matrix owing to the in situ generated ZnO inter-layer and the ultrafine microstructure with an average grain size of 360 nm were simultaneously achieved in the hot extruded(HEed)1 wt%Cu_(2)O-GO/Zn-2 wt%Ag ***,HEed biocompos-ites possessed excellent tensile properties,including ultimate tensile strength(UTS)of 344.0±2.4 MPa,yield stress(YS)of 314.0±4.8 MPa,and elongation at failure of 15.5%±1.3%.Ultrafine and uniform microstructure of the HEed biocomposites resulted in a relatively uniform corrosion morphology and a degradation rate of 0.195±0.004 mm y^(−1) in simulated body fluid(SBF)*** 2-fold diluted extract of the HEed biocomposites exhibited satisfying cytocompatibility with MC3T3-E1 pre-osteoblast comparable to that of Ti-6Al-4 V ELI *** importantly,the synergistic effect of metallic ions,Ag-rich nanoparticles,and GO sheets contributed to the remarkable antibacterial activity of the experimental biocomposites against both *** and *** results demonstrated that the 1Cu_(2)O-GO/Zn-2Ag biocomposites should be anticipated as a promising biodegradable material for orthopedic applications.

关键词： Zn-based composite In situ reaction Ultrafine microstructure Inerfacial bonding Antibacterial behavior

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Experimental and Numerical Investigation on the Aerodynamic Characteristics of High-Speed Pantographs with Supporting Beam Wind Deflectors

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Fluid Dynamics & Materials Processing 2024年第1期20卷 127-145页

作者： Shiyang Song tongxin Han Postgraduate Department China Academy of Railway SciencesBeijing100081China Locomotive&Car Research Institute China Academy of Railway Sciences Corporation LimitedBeijing100081China

Aiming to mitigate the aerodynamic lift force imbalance between pantograph strips,which exacerbates wear and affects the current collection performance of the pantograph-catenary system,a study has been conducted to support the beam deflector optimization using a combination of experimental measurements and computational fluid dynamics(CFD)*** results demonstrate that the size,position,and installation orientation of the wind deflectors significantly influence the amount of force *** also indicate that the front strip deflectors should be installed downwards and the rear strip deflectors upwards,thereby forming a“π”***,the lift force compensation provided by the wind deflectors increases with the size of the *** wind compensation strategies,such as control circuits,are also discussed,putting emphasis on the pros and cons of various pantograph types and wind compensation approaches.

关键词： High-speed pantograph aerodynamic lift force supporting beam wind deflectors computational fluid dynamics(CFD)

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distributed Cooperative Anti-disturbance Control for High-Order MIMO Nonlinear Multi-Agent Systems

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Journal of Shanghai Jiaotong university(Science) 2024年第4期29卷 656-666页

作者： JIN Feiyu CHEN Longsheng LI Tongshuai SHI tongxin School of Aircraft Engineering Nanchang Hangkong UniversityNanchang330063China

To solve the synchronization and tracking problems,a cooperative control scheme is proposed for a class of higher-order multi-input and multi-output(MIMO)nonlinear multi-agent systems(MASs)subjected to uncertainties and external ***,coupled relationships among Laplace matrix,leader-following adjacency matrix and consensus error are analyzed based on undirected ***,nonlinear disturbance observers(NDOs)are designed to estimate compounded disturbances in MASs,and a distributed cooperative anti-disturbance control protocol is proposed for high-order MIMO nonlinear MASs based on the outputs of NDOs and dynamic surface control ***,the feasibility and effectiveness of the proposed scheme are proven based on Lyapunov stability theory and simulation experiments.

关键词： nonlinear disturbance observer(NDO) higher-order multi-input and multi-output(MIMO)system multi-agent system cooperative control disturbance suppression

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Systematic engineering of BiVO_(4)photoanode for efficient photoelectrochemical water oxidation

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Carbon Energy 2024年第4期6卷 12-21页

作者： Zhiting Liang Meng Li Kai‐Hang Ye tongxin Tang Zhan Lin Yuying Zheng Yongchao Huang Hongbing Ji Shanqing Zhang Guangzhou Key Laboratory of Clean Transportation Energy Chemistry School of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhouChina Chemical Engineering Guangdong Laboratory Jieyang Branch of ChemistryJieyangChina Key Laboratory for Water Quality and Conservation of the Pearl River Delta Institute of Environmental Research at Greater Bay AreaMinistry of EducationGuangzhou UniversityGuangzhouChina State Key Laboratory Breeding Base of Green‐Chemical Synthesis Technology Institute of Green Petroleum Processing and Light Hydrocarbon ConversionCollege of Chemical EngineeringZhejiang University of TechnologyHangzhouChina School of Environment and Science Centre for Catalysis and Clean EnergyGriffith UniversityGold Coast CampusSouthportQueenslandAustralia

BiVO_(4)is one of the most promising photoanode materials for photoelectrochemical(PEC)solar energy conversion,but it still suffers from poor photocurrent density due to insufficient light‐harvesting efficiency(LHE),weak photogenerated charge separation efficiency(Φ_(Sep)),and low water oxidation efficiency(Φ_(OX)).Herein,we tackle these challenges of the BiVO_(4)photoanodes using systematic engineering,including catalysis engineering,bandgap engineering,and morphology *** particular,we deposit a NiCoO_(x)layer onto the BiVO_(4)photoanode as the oxygen evolution catalyst to enhance theΦ_(OX)of Fe‐g‐C_(3)N_(4)/BiVO_(4)for PEC water oxidation,and incorporate Fe‐doped graphite‐phase C_(3)N_(4)(Fe‐g‐C_(3)N_(4))into the BiVO_(4)photoanode to optimize the bandgap and surface areas to subsequently expand the light absorption range of the photoanode from 530 to 690 nm,increase the LHE andΦ_(Sep),and further improve the oxygen evolution reaction activity of the NiCoO_(x)catalytic ***,the maximum photocurrent density of the as‐prepared NiCoO_(x)/Fe‐g‐C_(3)N_(4)/BiVO_(4)is remarkably boosted from 4.6 to 7.4 mA cm^(−2).This work suggests that the proposed systematic engineering strategy is exceptionally promising for improving LHE,Φ_(Sep),andΦ_(OX)of BiVO_(4)‐based photoanodes,which will substantially benefit the design,preparation,and large‐scale application of next‐generation high‐performance photoanodes.

关键词： bismuth vanadate carbon nitride charge separation heterojunction water oxidation

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TiO_(2) nanofiber-supported copper nanoparticle catalysts for highly efficient methane conversion to C1 oxygenates under mild conditions

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Nano Research 2024年第5期17卷 3844-3852页

作者： Wencui Li Yu Ren Zean Xie Yipeng Wang Hang Zhang dianxiang Peng Hengfang Shen Hongfei Shi Jiaxin Cai Peng Wang tongxin Zhang Zhen Zhao State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Beijing 102249China Institute of Catalysis for Energy and Environment College of Chemistry&Chemical EngineeringShenyang Normal UniversityShenyang 110034China Institute of Petrochemical Technology Jilin Institute of Chemical TechnologyJilin 132022China

The selective oxidation of methane under mild conditions remains the“Holy Grail of Catalysis”.The key to activating methane and inhibiting over-oxidation of target oxygenates lies in designing active *** nanoparticles were loaded onto TiO_(2) nanofibers using the photo-deposition *** resulting catalysts were found to effectively convert methane into C1 oxygenated products under mild *** with previously reported catalysts,it delivers a superior performance of up to 2510.7 mmol·g_(Cu)^(-1)·h^(-1) productivity with a selectivity of around 100%at 80℃for 5 *** characterizations and density functional theory(DFT)calculations indicate that TiO_(2) in the mixed phase of anatase and rutile significantly increases the Cu^(+)/CuO ratio of the supported Cu species,and this ratio is linearly related to the formation rate of oxygen-containing *** CuI site promotes the generation of active O species from H_(2)O_(2) dissociation on Cu_(2)O(111).These active O species reduce the energy barrier for breaking the C-H bond of CH_(4),thus boosting the catalytic *** methane conversion mechanism was proposed as a methyl radical pathway to form CH_(3)OH and CH_(3)OOH,and then the generated CH_(3)OH is further oxidized to HOCH_(2)OOH.

关键词： TiO_(2)nanofiber copper nanoparticles photo-deposition method methane oxidation C1 oxygenates

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FL-Online:An x-ray crystallographic web-server for atomic-scale structure analysis of biomolecule

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Chinese Physics B 2024年第7期33卷 37-42页

作者：王宾堂牛彤欣范海福丁玮 Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Center for Biological Imaging Core Facilities for Protein ScienceInstitute of BiophysicsChinese Academy of SciencesBeijing 100101China

FL-Online(http://***) is an out-of-box modern web service featuring a user-friendly interface and simplified parameters, providing academic users with access to a series of online programs for biomolecular crystallography, including SAPI-online, OASIS-online, C-IPCAS-online and a series of upcoming software releases. Meanwhile, it is a highly scalable and maintainable web application framework that provides a powerful and flexible solution for academic web development needs. All the codes are open-source under MIT licenses in GitHub.

关键词： graphical web service OASIS IPCAS direct methods protein crystallography

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针对高速列车受电弓气动特性仿真的不同湍流模型适用性研究

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中国铁道科学 2024年第2期45卷 164-174页

作者：宋诗扬韩通新中国铁道科学研究院研究生部北京100081 中国铁道科学研究院集团有限公司机车车辆研究所北京100081

为探究高速受电弓气动特性仿真时不同湍流模型在不同运行环境中的适用性,基于k-ε,SST k-ω和Spalart-Allmaras 3个湍流模型的理论基础和计算流体力学仿真方法,通过线路试验对仿真结果进行验证后,对比不同模型在开阔环境和隧道环境中的... 详细信息

为探究高速受电弓气动特性仿真时不同湍流模型在不同运行环境中的适用性,基于k-ε,SST k-ω和Spalart-Allmaras 3个湍流模型的理论基础和计算流体力学仿真方法,通过线路试验对仿真结果进行验证后,对比不同模型在开阔环境和隧道环境中的精确度和计算效率。结果表明:在300 km·h^(-1)速度下,SST k-ω与k-ε模型在开阔环境中的闭口和开口方向气动抬升力计算结果差异分别为0.7%和1.5%,与Spalart-Allmaras模型计算结果差异分别为7.1%和5.5%;SST k-ω和k-ε模型在边界层预测均匀,Spalart-Allmaras模型在边界层分离区的预测准确性较低,但在隧道环境中它的精确度高于k-ε模型;在计算效率方面,Spalart-Allmaras模型的迭代次数和收敛速度优于SST k-ω模型;在适用性方面,开阔环境中k-ε模型的精确度和计算效率表现优异,更为适用,而在隧道环境中Spalart-Allmaras模型具有较高的精确度和计算效率,更为适用,但在对精确度要求高且可忽略计算效率因素的情况下SST k-ω模型具有较好适用性和高精确度,更为适用。

关键词：高速列车受电弓气动特性湍流模型适用性气动抬升力计算流体力学仿真

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有序信息在空间立方体抽样中的拓展研究

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系统科学与数学 2024年第2期44卷 508-522页

作者：李毅王童欣石中玉山西财经大学信息学院太原030000 山西财经大学统计学院太原030000

在空间调查领域中,分布良好的样本中很少会同时出现彼此接近的单元.将地理坐标作为平衡变量的立方体法存在无法捕捉总体单元的空间依赖性的不足.文章在立方体法能有效捕获总体空间趋势的基础上,创新性地引入系统抽样的思想.文章提出的... 详细信息

在空间调查领域中,分布良好的样本中很少会同时出现彼此接近的单元.将地理坐标作为平衡变量的立方体法存在无法捕捉总体单元的空间依赖性的不足.文章在立方体法能有效捕获总体空间趋势的基础上,创新性地引入系统抽样的思想.文章提出的抽样设计方法在保持单元空间相对位置的同时,充分利用地理坐标信息,集中相似单元点获得有序总体,使原先总体具有“空间趋势”.首先,在保持空间相关性的前提下,将抽样单元排序问题转换为单源最短路径问题.然后,利用dijkstra算法获得有序总体,在快速立方体法的飞行阶段更新初始包含概率进行有序空间抽样.最后,通过模拟研究和实证分析表明对空间总体按照相似单元彼此靠近的原则进行排序,可减少抽样误差,获得较为均衡的样本,从而验证所提抽样思路的可行性.

关键词：空间抽样空间自相关立方体法有序总体地理坐标

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火干扰对森林土壤氮素循环与转化的影响研究进展

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生态学杂志 2024年第2期43卷 372-382页

作者：胡同欣丁海磊孙龙东北林业大学林学院森林生态系统可持续经营教育部重点实验室哈尔滨150040

森林火灾是森林生态系统最重要的干扰因素之一,林火的发生改变了森林土壤生态环境,影响着土壤氮素循环与转化的生物与非生物因子,对土壤氮库以及氮素循环过程有着重要影响。阐明火干扰下森林土壤氮组分的变化特征,对于理解森林土壤氮素... 详细信息

森林火灾是森林生态系统最重要的干扰因素之一,林火的发生改变了森林土壤生态环境,影响着土壤氮素循环与转化的生物与非生物因子,对土壤氮库以及氮素循环过程有着重要影响。阐明火干扰下森林土壤氮组分的变化特征,对于理解森林土壤氮素循环与转化对火干扰的响应机理至关重要。而现有关于火干扰对土壤氮素循环与转化的影响研究结果还不尽一致,其影响机制尚不明晰。笔者通过查阅大量相关文献,重点论述了火干扰对土壤氮循环中氮素损失、氮素固持、氮矿化、反硝化和气态氮排放等关键过程的影响,以及火干扰对土壤氮素循环与转化的影响机制,认为土壤氮素循环与转化的特征主要受到火烧因子(火烧强度、火烧频率、火烧后恢复时间、火后恢复方式、火后产物黑碳和灰分)、植被类型及土壤性质3个方面的影响,并从火干扰对土壤氮循环的影响机制、火干扰对土壤氮素循环的长期影响、火干扰后产物对土壤氮素循环影响等3个方面进行探讨与展望,以期深入了解火干扰下土壤氮素循环的特征。

关键词：火干扰森林土壤植被类型氮循环氮素转化

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计划火烧对红松人工林细根生物量的影响

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生态学杂志 2024年第2期43卷 362-371页

作者：孙龙胡春雨胡同欣东北林业大学林学院森林生态系统可持续经营教育部重点实验室哈尔滨150040

细根作为植物重要的功能器官,是植物和土壤养分传输的重要通道。计划火烧是重要的营林方式。研究计划火烧对细根生物量的影响,将有助于深入了解植物群落组成和生态系统的地下竞争作用。本研究以鹤岗红松人工林为对象,设置对照和火烧两... 详细信息

细根作为植物重要的功能器官,是植物和土壤养分传输的重要通道。计划火烧是重要的营林方式。研究计划火烧对细根生物量的影响,将有助于深入了解植物群落组成和生态系统的地下竞争作用。本研究以鹤岗红松人工林为对象,设置对照和火烧两种样地,于2018年11月初开展计划火烧,利用内径7 cm的土壤钻进行细根和土壤的采集,样品分为0~10和10~20 cm上、下两层,测得细根生物量组成变化,分析计划火烧后土壤性质变化以及细根生物量的主要影响因子。结果表明:计划火烧后上、下层活细根生物量分别显著减少5.7%~16.3%和6.1%~12.4%,上、下层死细根生物量分别显著增加8.5%~17.4%和5.1%~14.1%。计划火烧后乔木上、下层细根生物量分别显著减少17%和10%,草本上、下层细根生物量分别显著增加14%和9%。此外,计划火烧显著增加上、下层吸收根生物量与运输根生物量的比例5.7%~12.9%和4.2%,提高吸收根在细根中所占的比例。计划火烧前后细根生物量对土壤因子做出不同的响应。根据RDA分析可知,计划火烧后的细根生物量主要受土壤温度、含水率和铵态氮含量影响。温度升高促进细根生物量的增加,乔木和草本吸收根生物量与土壤含水率呈显著正相关。乔木吸收根生物量与铵态氮含量呈显著正相关。综上所述,红松人工林细根生物量在植物生活型、细根功能类型组成和土壤影响因子上对计划火烧做出响应。本研究揭示了计划火烧对红松人工林细根生物量的影响,为合理开展计划火烧提供理论支持。

关键词：计划火烧细根生物量土壤理化性质功能类型影响因子

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