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装配式风电混塔胶黏拼缝的内聚力本构模型及塔筒承载力研究

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振动与冲击 2025年第04期44卷 71-81页

作者：黄赐荣张栋梁付坤李天昊何澜章家炜中国电建集团华东勘测设计研究院有限公司浙江华东新能科技有限公司

为了探究装配式风电混塔胶黏拼缝的黏结性能以及塔筒整体的承载力，开展了混凝土-结构胶黏结界面的法向拉伸和切向剪切试验。针对混凝土黏结界面位置的裂纹开展以及破坏模式进行了详细考察，明确了黏结界面的法向以及切向的内聚力本构... 详细信息

为了探究装配式风电混塔胶黏拼缝的黏结性能以及塔筒整体的承载力，开展了混凝土-结构胶黏结界面的法向拉伸和切向剪切试验。针对混凝土黏结界面位置的裂纹开展以及破坏模式进行了详细考察，明确了黏结界面的法向以及切向的内聚力本构模型。基于试验得到的内聚力本构模型建立了6节段的装配式风电混塔简化模型，开展了装配式塔筒在纯扭及弯扭荷载工况下的承载能力研究，探究了竖缝结构胶对于装配式混塔承载力的影响。研究表明：混凝土-结构胶-混凝土黏结试件的剪切破坏模式以黏结界面破坏为主，抗剪性能会弱于混凝土本身；而法向拉伸破坏模式以混凝土基材破坏为主，抗拉性能会强于混凝土本身；通过数值模拟计算结果发现，相比于摩擦接触模型，竖缝内聚力模型(cohesive zone model, CZM)的抗扭承载能力有显著提升，但扭矩持续加载导致竖缝内聚力单元破坏后，其抗扭承载力和摩擦接触模型相近。

关键词：陆上风电装配式混塔胶黏拼缝内聚力模型(CZM) 数学本构模型抗扭承载力

Steady State Behavior of the Free Recall Dynamics of Working Memory

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Journal of Systems Science & Complexity 2024年第6期37卷 2424-2450页

作者： li tianhao liU Zhixin liU lizheng HU Xiaoming Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of SciencesSchool of Mathematical SciencesUniversity of Chinese Academy of SciencesBeijing 100190China Academy for Engineering and Technology Fudan UniversityShanghai 200433China Optimization and Systems Theory KTH Royal Institute of TechnologyStockholm 10044Sweden

This paper studies a dynamical system that models the free recall dynamics of working *** model is an attractor neural network with n modules,named hypercolumns,and each module consists of m *** mild conditions on the connection weights between minicolumns,the authors investigate the long-term evolution behavior of the model,namely the existence and stability of equilibria and limit *** authors also give a critical value in which Hopf bifurcation ***,the authors give a sufficient condition under which this model has a globally asymptotically stable equilibrium consisting of synchronized minicolumn states in each hypercolumn,which implies that in this case recalling is *** simulations are provided to illustrate the proposed theoretical ***,a numerical example the authors give suggests that patterns can be stored in not only equilibria and limit cycles,but also strange attractors(or chaos).

关键词： Asymptotic stability bifurcation free recall strange attractor working memory

Delivering quantum dots to lubricants: Current status and prospect

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Friction 2022年第11期10卷 1751-1771页

作者： Wenling ZHANG tianhao li Rong AN Jiong WANG Yu TIAN School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China Herbert Gleiter Institute of Nanoscience School of Material Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Very recently,two-dimensional quantum dots(2D QDs)have been pioneeringly investigated as lubricant additives,which exhibit superior friction-reducing and wear *** with 2D nanoparticles,2D QDs possess small size(~10 nm)and abundant active *** distinguished advantages enable them to quickly disperse into common lube mediums and maintain long-term storage *** good dispersion stability of 2D QDs not only effectively improves their embedding capacity,but also enables continuous supplements of lubricants during the sliding ***,2D QDs are attracting increasing research interest as efficient lubricants with desirable service *** this review,we focus on the latest studies of 2D QDs as liquid lubricant additives(both in polar and nonpolar mediums),self-lubricating solid coatings and gels,*** advanced strategies for synthesis and modification of 2D QDs are summarized.A comprehensive insight into the tribological behavior of a variety of 2D QDs together with the associated mechanism is reviewed in *** superior lubricating performances of 2D QDs are attributed to various mechanisms,including rolling effect,self-mending performance,polishing effect,tribofilm formation,nanostructure transfer and synergistic effects,*** for friction modulation of 2D QDs,including internal factors(surface modification,elemental doping)and extrinsic factors(counter surfaces,test conditions)are discussed,special attentions for achieving intelligent tribology toward superlubricity and bio-engineering,are also ***,the future challenges and research directions regarding QDs as lubricants conforming to the concept of“green tribology”toward a sustainable society are discussed.

关键词： quantum dots(QDs) design diversity dispersibility embedding stability lubrication

Heterocyclic Carbene-Catalyzed Hydride Transfer in the Hydroboration of Carbonyl Compounds

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Chinese Journal of Chemistry 2019年第7期37卷 679-683页

作者： tianhao li Jianying Zhang Chunming Cui State Key Laboratory of Elemento-Organic Chemistry Nankai University 94 Weijin Road Tianjin 300071 China

N-Heterocyclic carbene (NHC) enabled the highly efficient catalytic hydroboration of a wide range of ketones and aldehydes under mild conditions,and a new mechanism of catalytic hydroboration reaction which involves d... 详细信息

关键词： Hydride Transfer Carbonyl Compounds

In situ photocatalytically enhanced thermogalvanic cells for electricity and hydrogen production

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Chinese Journal of Structural Chemistry 2024年第1期43卷 1-2页

作者： tianhao li Wenguang Tu Zhigang Zou School of Science and Engineering The Chinese University of Hong KongShenzhenGuangdong518172PR China

Converting low-grade thermal energy into electricity through ther-mogalvanic cells offers a promising approach to addressing environ-mental challenges[1].However,thermogalvanic cells face obstacles,due to limited thermopower,connected to differences in solvent-dependent entropy(ΔS)among redox anions and varying concentration ratios(ΔC)between hot and cold sides[2,3].A typical strategy to enhance the thermopower involves the improvement ofΔS of the redox ***-fortunately,ΔC tends to approach zero spontaneously due to the ther-modynamic instability and redox ion ***,the challenge is to maintain significantΔC for both redox ions and unravel the intricate modulation mechanisms[4].

关键词： redox maintain entropy

An improved large signal model of InP HEMTs

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Journal of Semiconductors 2018年第5期39卷 48-53页

作者： tianhao li Wenjun li Jun liu Key Laboratory for RF Circuits and Systems of Ministry of Education Hangzhou Dianzi University

An improved large signal model for InP HEMTs is proposed in this *** channel current and charge model equations are constructed based on the Angelov model *** the equations for channel current and gate charge models were all continuous and high order drivable,and the proposed gate charge model satisfied the charge *** the strong leakage induced barrier reduction effect of InP HEMTs,the Angelov current model equations are *** channel current model could fit DC performance of devices.A 2×25μm×70 nm InP HEMT device is used to demonstrate the extraction and validation of the model,in which the model has predicted the DC I–V,C–V and bias related S parameters accurately.

关键词： InP HEMT large-signal model

MOF synthesis using waste PET for applications of adsorption, catalysis and energy storage

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Green Energy & Environment 2024年第11期9卷 1650-1665页

作者： Hongmei li Jinming Lei liying Zhu Yanling Yao Yuanhua li tianhao li Chuntian Qiu College of Food and Bioengineering Chengdu UniversityChengdu610106China ZJU-Hangzhou Global Scientifc and Technological Innovation Center Zhejiang UniversityHangzhou311215China School of Chemistry and Materials Engineering Huizhou UniversityHuizhou516007China Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energy School for Materials and EnergySouthwest UniversityChongqing400715China Yibin Academy of Southwest University University RoadYibinSichuan644005China

Polyethylene terephthalate (PET) as one of non-degradable wastes has become a huge threat to the environment and human *** Recycle of PET is a sustainable way to release 1,4-benzenedicarboxylic acid (BDC) the monomer of PET as common used organiclinker for synthesis of functional Metal–organic-frameworks (PET-derived MOFs) such as UiO-66, MIL-101, etc. This sustainable and costeffective“Waste-to-MOFs” model is of great signiﬁcant to be intensively investigated in the past years. Attributes of substantial porosity, speciﬁcsurface area, exposed metal centers, uniform structure, and ﬂexible morphology render PET-derived MOFs are well-suited for applications inadsorption, energy storage, catalysis, among others. Herein, in the present work, we have summarized recent advances in synthesis of PETderived MOFs using ex-situ and in-situ methods for typical applications of adsorption, catalysis and energy storage. Despite those improvementsin synthesis methods and potential applications, challenges still remain in development of green and economical routes to fully utilize waste PETfor massive manufacture of valuable MOF materials and chemicals. This review provides insights into the conversion of non-degradable PETwaste to value-added MOF materials, and further suggests promising perspectives to develop the sustainable “Waste-to-MOFs” model inaddressing environmental pollution and energy crises.

关键词： Plastic waste Polyethylene terephthalate Chemical recycle 1,4-benzenedicarboxylic acid Metal organic frameworks

Tailoring circular dichroism via the Born-Kuhn model for meta-holograms

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Science China(Physics,Mechanics & Astronomy) 2022年第10期65卷 83-92页

作者： He Wang Hongqiang Zhou tianhao li Zhe Qin Chenchen li Xin li Yongfeng li Jieqiu Zhang Shaobo Qu lingling Huang Department of Basic Sciences Air Force Engineering UniversityXi’an 710051China Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China Department of Physics and Optoelectronics Faculty of ScienceBeijing University of TechnologyBeijing 100124China

Chirality, as one of the ubiquitous properties in nature, has aroused striking attention in the fields of physics and materials sciences. For tailoring of light with more degree of freedom, circular dichroism has been considered as the auxiliary dimension to improving such an issue. Inspired by the Born-Kuhn plasmonic oscillation model, we demonstrate and discuss a chiral resonator to reveal reverse circular dichroism within two separate frequency bands in the microwave regime. The underlying physical mechanisms of bonding and anti-bounding modes are analyzed via transmission/reflection spectra and surface current distributions for different chiral enantiomers. To leverage the proposed paradigm to the application levels, especially for metaholography, we conduct the numerical simulation and experimental demonstration of two proofs of principles. Based on the Pancharatnam-Berry phase/amplitude modulation and complex-amplitude manipulation, respectively, the meta-holograms with independent targets of reconstructing images in full-space and reflected regions are achieved. Significantly, our paradigm may promise further applications in spin-controlled meta-devices for image processing, information encryption, anti-counterfeiting,remote sensing, and radar systems.

关键词： circular dichroism Born-Kuhn model meta-hologram electromagnetic manipulation

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Effect of silane coupling agents on flowability and compressibility of compound for bonded NdFeB magnet

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Journal of Rare Earths 2022年第5期40卷 772-777,I0004页

作者： Xiaowei Zhang Zilong Wang tianhao li Shengjie Zhu Dunbo Yu Wenlong Yan Yang Luo National Engineering Research Center for Rare Earth Materials GRINM Group Co.Ltd.Beijing 100088China GRIREM Advanced Materials Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China

Based on the difference of the Y-terminal functional group of the silane coupling agent(Y-Si(X)_(3)),four different silane coupling agents were employed to pretreat the surface of the NdFeB *** effects of silane coupling agents on the flowability and compressibility of compounds for preparing bonded NdFeB magnets were *** is indicated that compounds pretreated by silane coupling agents have weaker friction and meshing *** apparent density is increased by 0.3 g/cm^(3 )compared with the compound without silane coupling agent,and the radial crushing strength is significantly increased by about 3-4 *** addition,the epoxy resin is more evenly distributed on the surface of the compounds treated by silane coupling agents observed by scanning electron microscopy,and some agglomerated particles are ***,the compressibility of compounds with silane coupling agents is significantly improved due to the fact that hardening exponents are ***,the addition of silane coupling agents has almost no effect on the magnetic properties of bonded *** special energy was used to manifest the flowability of magnetic powder particles representing the macroscopic performance of the force between powder particles,providing a new direction for the study of the interface compatibility of two-phase or multiphase composite materials.

关键词： Bonded NdFeB magnets Silane coupling agent Flowability Special energy Compressibility Rare earths