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Kinematic synthesis and simulation of a vegetable pot seedling transplanting mechanism with four exact task poses

International Journal of Agricultural and Biological Engineering 2023年第2期16卷 85-95页

作者： Liang sun Haocong Xu Yuzhu Zhou jiahao Shen Gaohong Yu Huafeng Hu Yuejun Miao Faculty of Mechanical Engineering&Automation Zhejiang Sci-Tech UniversityHangzhou 310018China Zhejiang Province Key Laboratory of Transplanting Equipment and Technology Hangzhou 310018China Hunan Xiangyuan Jinsui Intelligent Equipment Co. LtdLoudi 417700HunanChina Hangzhou Anjie Brake Co. LtdHangzhou 310018China

To obtain a picking and planting integrated transplanting mechanism(PITM)with ideal trajectory shape,reasonable operating attitude,and compact structure for vegetable pot seedling transplanting,a symmetrical structural PITM composed of two planetary carriers and driven by a cam-noncircular gear combination mechanism was proposed in this *** accordance with the requirements of transplanting agronomy,the shape of the motion trajectory and the attitude of the end tip of the clamping claw at several specific positions(the starting and end points of picking seedling,the starting point of pushing seedling,and a special point on the return segment)were *** make the clamping claws of PITM pass through a set of prescribed positions,the mechanism was simplified to an open-chain 3R *** accurate four-position-based method for solving the open-chain mechanism model was adopted to obtain the curves of its fixed hinge point(central point)and dynamic hinge point(circle point).The ratio of adjacent bars’lengths was analyzed to determine the feasible interval of the central and circle point curves and the reasonable link length.A desired closed transplanting trajectory that goes through the given points and the corresponding transmission ratio model of the open-chain mechanism was *** the transmission ratio of each stage of gear and cam pairs was calculated and distributed,the prototype of PITM was designed and ***,the effectiveness and feasibility of the design were verified through a preliminary experiment of the prototype.

关键词： kinematic synthesis transmission ratio non-circular gear planetary carrier

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Negative permittivity derived from inductive characteristic in the percolating Cu/EP metacomposites

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Journal of Materials Science & Technology 2019年第11期35卷 2463-2469页

作者： Kai sun jiahao Xin Yaping Li Zhongyang Wang Qing Hou Xiaofeng Li Xinfeng Wu Runhua Fan Kwang Leong Choy College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai201306China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinan250061China Department of Materials Science and Engineering National University of SingaporeSingapore119077Singapore Department of Chemistry University College LondonLondonWC1H 0AJUK UCL Institute for Materials Discovery University College LondonLondonWC1E 7JEUK

Recently,increasing attention has been concentrated on negative permittivity with the development of the emerging metamaterials composed of periodic array ***,taking facile preparation into consideration,it is important to achieve negative permittivity behavior based on materials'intrinsic properties rather than their artificially periodic *** this paper,we proposed to fabricate the percolating composites with copper dispersed in epoxy(EP)resin by a polymerization method to realize the negative permittivity *** Cu content in the composites reached to 80 wt%,the conductivity abruptly went up by three orders of magnitudes,suggesting a percolation *** the percolation threshold,the conductivity spectra conform to Jonscher's power law;when the Cu/EP composites reached to percolating state,the conductivity gradually reduced in high frequency region due to the skin *** is indicated that the conductive mechanism changed from hopping conduction to electron *** addition,the permittivity did not increase monotonously with the increase of Cu content in the vicinity of percolation threshold,due to the presence of leakage ***,the negative permittivity conforming to Drude model was observed above the percolation *** investigation revealed that there was a constitutive relationship between the permittivity and the *** conductive fillers are slightly above the percolation threshold,the inductive characteristic derived from conductive percolating network leads to the negative *** epsilon-negative materials can potentially be applied in novel electrical devices,such as high-power microwave filters,stacked capacitors,negative capacitance field effect transistors and coil-free *** addition,the design strategy based on percolating composites provides an approach to epsilon-negative materials.

关键词： Negative permittivity Epsilon-negative materials Percolating composites Metacomposites Metamaterials

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New proof of continuity of Lyapunov exponents for a class of smooth Schrödinger cocycles with weak Liouville frequencies

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Frontiers of Mathematics in China 2020年第3期15卷 467-489页

作者： Linlin FU jiahao XU Fan WU Department of Mathematics Sun Yat-sen UniversityGuangzhou 510275China Chern Institute of Mathematics and LPMC Nankai UniversityTianjin 300017China Department of Mathematics Nanjing UniversityNanjing 210093China

We reconsider the continuity of the Lyapunov exponents for a class of smooth Schrödinger cocycles with a C2 cos-type potential and a weak Liouville *** propose a new method to prove that the Lyapunov exponent is conti... 详细信息

关键词： Schrodinger cocycle Lyapunov exponent(LE) weak Liouville frequency C2 cos-type potential large deviation theorem(LDT)

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Metal–organic framework-derived Co_(3)O_(4)modified nickel foam-based dendrite-free anode for robust lithium metal batteries

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Chinese Chemical Letters 2023年第8期34卷 382-386页

作者： Tao Wei jiahao Lu Pan Zhang Guang Yang Cheng sun Yanyan Zhou Quanchao Zhuang Yongfu Tang School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China Hebei Key Laboratory of Applied Chemistry School of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China Li-ion Batteries Lab School of Materials Science and EngineeringChina University of Mining and TechnologyXuzhou 221116China

For several decades,the promise of implementing of lithium(Li)metal anodes for Li batteries has been a"holy grail"for ***,we have proposed a facile design of a MOF-derived Co_(3)O_(4)nanoparticles modified nickel foam,i.e.,Co_(3)O_(4)-NF,as a 3D host to achieve a uniform infusion of the molten *** molten Li was uniformly absorbed on the Co_(3)O_(4)-NF host only in 10 s due to its high Li *** obtained Li-Co_(3)O_(4)-NF composite electrode shows high cycling stability in symmetric cells with low voltage hysteresis even at a high current density of 5 mA/*** full cells of Li-Co_(3)O_(4)-NF/LiFePO_(4)can cycle for more than 500 cycles at 2C without obvious capacity *** after cycling and in situ optical microscope results suggest that the unique 3D host structure of the Li-Co_(3)O_(4)-NF anode plays key roles on suppressing the dendrite growth and decreasing the local current *** believe this work might provide a new strategy for fabricating dendrite-free Li metal anodes and facilitate practical applications in Li batteries.

关键词： All solid-state lithium-ion batteries Metal-organic frameworks(MOFs) Lithium metal anodes Dendrite-free anode Three-dimensional anode

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The effects of amino groups and open metal sites of MOFs on polymer-based electrolytes for all-solid-state lithium metal batteries

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Chinese Journal of Chemical Engineering 2023年第8期60卷 80-89页

作者： jiahao Lu Zhimeng Wang Qi Zhang Cheng sun Yanyan Zhou Sijia Wang Xiangyun Qiu Shoudong Xu Rentian Chen Tao Wei School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China Power&Energy Storage System Research Center College of Mechanical and Electrical EngineeringQingdao UniversityQingdao 266071China College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China Institute of Mechanics and Energy National Research Ogarev Mordovia State UniversitySaransk 430000Russia

Metal-organic frameworks(MOFs) are becoming more and more popular as the fillers in polymer electrolytes in recent years. In this study, a series of MOFs(NH_(2)-MIL-101(Fe), MIL-101(Fe), activated NH_(2)-MIL-101(Fe) and activated MIL-101(Fe)) were synthesized and added to PEO-based solid composite electrolytes(SCEs). Furthermore, the role of the —NH_(2) groups and open metal sites(OMSs) were both examined. Different ratios of MOFs vs polymers were also studied by the electrochemical characterizations. At last, we successfully designed a novel solid composite electrolyte containing activated NH_(2)-MIL-101(Fe),PEO, Li TFSI and PVDF for the high-performance all-solid-state lithium-metal batteries. This work might provide new insight to understand the interactions between polymers and functional groups or OMSs of MOFs better.

关键词： Solid composite electrolytes NH_(2)-MIL-101(Fe) All solid-state lithium metal batteries Metal-organic frameworks(MOFs) Open metal sites(OMSs)

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中药有效成分结合骨组织工程材料用于骨修复

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中国组织工程研究 2025年第10期29卷 2141-2150页

作者：吴尧昆刘成林付佳豪宋伟陈浩席洪钟刘锌杜斌孙光权南京中医药大学附属医院江苏省南京市210029

背景:如何修复骨缺损一直以来是临床难题,中药有效成分在骨修复方面具有良好的生物活性与治疗效果,将中药有效成分与组织工程材料相结合在骨修复领域具有广阔的前景。不同中药有效成分与支架的组合在作用关系方面具有相似之处。目的:搜... 详细信息

背景:如何修复骨缺损一直以来是临床难题,中药有效成分在骨修复方面具有良好的生物活性与治疗效果,将中药有效成分与组织工程材料相结合在骨修复领域具有广阔的前景。不同中药有效成分与支架的组合在作用关系方面具有相似之处。目的:搜集常见的中药有效成分与支架材料组合的案例,基于七情配伍的启发将组织工程支架与中药有效成分类比为产生配伍关系的两类中药,以二者的作用关系为纲进行归纳总结。方法:检索1998年1月至2024年1月Pub Med和中国知网数据库中发表的相关文献,英文检索词:“traditional Chinese medicine,Chinese medicine,traditional Chinese medicine monomers,bone defect,bone repair,bone tissue engineering,tissue engineering,scaffold”,中文检索词:“中药,中药有效成分,中药单体,骨组织工程,骨组织工程支架,支架,组织工程,骨缺损,骨修复”,最终纳入88篇文献进行综述分析。结果与结论:(1)组织工程支架材料与中药有效成分各自均在骨修复领域有广泛的运用,二者在成骨方面优势明显但仍有许多缺陷,许多研究致力于将二者制备成复合材料,希望通过二者间的相互作用发挥减毒增效作用。(2)一些药物与材料在成骨、抗菌、促血管生成方面能互相促进,增强原有的效果,受到传统方剂配伍观念的启发,文章将其归纳为“相须”关系,并举实例佐证。(3)一些药物能提高材料的强度,而某些材料能对负载于其上的药物实现缓释控释效果、增加载药量与稳定性,或是进行靶向递送,文章将这种单方面的提升效果归纳为“相使”关系。(4)一些中药与材料搭配使用能减少对方的毒副反应,文章将这种减毒关系归纳为“相畏相杀”。(5)文章得出了一个由七情配伍关系启发、基于作用关系分类的关于中药复合支架的全新视角,将中药传统观念引入组织工程领域,为后续复合支架的研究者提供新的研究思路,并在选材搭配方面提供一定的便利。

关键词：七情配伍中药有效成分中药单体骨组织工程材料支架骨缺损骨修复减毒增效

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Thermosetting resin modified asphalt:A comprehensive review

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Journal of Traffic and Transportation Engineering(English Edition) 2023年第6期10卷 1001-1036页

作者： Zengping Zhang Hao Liu Xiaoyi Ban Xiaosong Liu Yinxiao Guo Jia sun Yanqi Liu Suyu Zhang jiahao Lei Key Laboratory for Special Area Highway Engineering of Ministry of Education Chang'an UniversityXi'an 710064China School of Transportation Southeast UniversityNanjing 210096China Chang'an Dublin Internaitonal College of Transportation Chang'an UniversityXi'an 710064China College of Future Transportation Chang'an UniversityXi'an 710064China

Thermosetting resins have advantages such as high strength,corrosion resistance,and aging resistance,and have excellent prospects for practical application as asphalt *** order to promote the research of thermosetting resin modified asphalt,to provide direction for its further research,this paper reviews the research progress of thermosetting resin modified asphalt in recent *** material composition,modification mechanism,and curing behavior of epoxy asphalt,thermosetting polyurethane modified asphalt,unsaturated polyester modified asphalt,and other thermosetting resin modified asphalts are *** types of thermosetting resin modified asphalt have different performances,the performance advantages of different thermosetting resin modified asphalts are *** the same time,the existing problems in thermosetting resin modified asphalt and further research directions are *** researchers to produce thermosetting resin modified asphalts using waste or bio-based materials,and to study the recycling technologies and life cycle assessment of thermosetting resin modified *** paper provides a reference for the study of thermosetting resin modified asphalt.

关键词： Pavement Modified asphalt Thermosetting resin Curing behavior Modification mechanism

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Mantle contributions to granitoids associated with Sn mineralization:Geochemical and isotopic evidence from the giant Dachang deposit,South China

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Geoscience Frontiers 2024年第1期15卷 187-208页

作者： Tingyi Wang Qihai Shu Xiaoping Xia Chao Li Yanning Wang jiahao Chen Xiang sun M.Santosh Qingfei Wang State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China Frontiers Science Center for Deep-time Digital Earth China University of Geosciences(Beijing)Beijing 100083China State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China National Research Center for Geoanalysis Chinese Academy of Geological SciencesBeijing 100037China Department of Earth Science University of AdelaideAdelaideSouth Australia 5005Australia State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China

Major Sn deposits are commonly linked to crust-derived and highly evolved granites,with magma generation aided by mantle ***,whether and how the mantle components contribute to Sn polymetallic mineralization remains *** this study,in combination with a compilation of equivalent data in the region,we provide new constraints on this issue based on detailed investigations on the petrogenesis and metallogenic significance of granitoids including the causative batholith and later granodiorite porphyry dike in the giant Dachang Sn deposit from South *** former has zircon U-Pb ages of 93-91 Ma and belongs to highly evolved S-type biotite granite,which experienced fractionation of massive *** latter shows zircon U-Pb ages of 90 Ma and displays I-type granite *** batholith was mainly derived from the dehydration melting of biotite in the metasedimentary sources,as revealed by the relatively low whole-rock Pb contents(850℃),whole-rock Mg#(52 to 58),apatiteεNd(t)(-9.2 to-6.5)and zirconεHf(t)(-7.6 to 2.5)values but lower zirconδ18O values(6.33 to 8.30‰)of the later granodiorite porphyry dike than those of the batholith also suggest that mantle material was involved in the generation of the dikes,which is evident by the variational features of zircon and apatite trace *** addition,at the zircon Hf0.05,the higher zirconΔFMQ values(mostly from-1.8 to 2.0)and H2O contents(100-1100 ppm)of the Dachang

关键词： Highly evolved S-type biotite granite I-type granodiorite porphyry dike Crust-mantle mixing Mantle contributions Dachang Sn mineralization

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High-Efficiency Dynamic Terahertz Deflector Utilizing a Mechanically Tunable Metasurface

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Research 2024年第3期2023卷 585-594页

作者： Zhenci sun Chao Liang Chen Chen Xiayu Wang Enze Zhou Xiaomeng Bian Yuanmu Yang Rui You Xiaoguang Zhao jiahao Zhao Zheng You Department of Precision Instrument Tsinghua UniversityBeijing 100084China State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua UniversityBeijing 100084China Beijing Advanced Innovation Center for Integrated Circuits Beijing 100084China School of Instrument Science and Opto-Electronic Engineering Beijing Information Science and Technology UniversityBeijing 100016China.

Terahertz (THz) wave manipulation, especially the beam deflection, plays an essential role in various applications, such as next-generation communication, space exploration, and high-resolution imaging. Current THz optical components and devices are hampered by their large bulk sizes and passive responses, limiting the development of high-performance, miniaturized THz microsystems. Tunable metasurfaces offer a powerful dynamic optical platform for controlling the propagation of electromagnetic waves. In this article, we presented a mechanically tunable metasurface (MTM), which can achieve terahertz beam deflection and vary the intensity of the anomalous reflected terahertz wave by changing the air gap between the metallic resonator (MR) array with phase discontinuities and Au ground plane. The absence of lossy spacer materials substantially enhances deflection efficiency. The device was fabricated by a combination of the surface and bulk-micromachining processes. The THz beam steering capability was characterized using terahertz time domain spectroscopy. When the air gap is 50 μm, the maximum deflection coefficient reaches 0.60 at 0.61 THz with a deflection angle of ~44.5°, consistent with theoretical predictions. We further established an electrically tunable miniaturized THz device for dynamic beam steering by introducing a micro voice coil motor to control the air gap continuously. It is shown that our designed MTM demonstrates a high modulation depth of deflection coefficient (~ 62.5%) in the target steered angle at the operating frequency. Our results showcase the potential of the proposed MTM as a platform for high-efficiency THz beam manipulation.

关键词： tunable Efficiency resonator

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MOF-Derived Materials Enabled Lithiophilic 3D Hosts for Lithium Metal Anode—A Review

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Chinese Journal of Chemistry 2023年第15期41卷 1861-1874页

作者： Tao Wei jiahao Lu Mengting Wang Cheng sun Qi Zhang Sijia Wang Yanyan Zhou Daifen Chen Ya-Qian Lan School of Energy and Power Jiangsu University of Science and TechnologyZhenjiangJiangsu 212003China School of Chemistry South China Normal University55 West Zhongsan Rd.GuangzhouGuangdong 510006China

Comprehensive Summary This work systematically reviews recent progresses in the applications of MOF-derived materials modified 3D porous conductive framework as hosts for uniform lithium deposition in LMBs.A series of commonly used lithiophilic materials and several kinds of representative MOF-derivation-modified 3D hosts as lithium metal anode(LMA)are ***,the challenges and future development of employing MOF-derived materials to modify the 3D porous conductive framework for LMA are included.

关键词： Metal-organic frameworks(MOFs) Lithium metal anode(LMA) Lithiophilic materials Three-dimensional(3D)host MOF-derived materials Interfacial modification Lithium-metal batteries Electrochemistry

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