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An Aerial–Wall Robotic Insect That Can Land, Climb, and Take Off from Vertical Surfaces

Research 2024年第1期2023卷 149-163页

作者： Qian Li Haoze Li Huan shen Yangguang Yu Haoran He Xincheng Feng Yi Sun Zhiyuan Mao Guangming Chen Zongjun Tian lida shen Xiangming Zheng Aihong Ji College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjingChina College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjingChina State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and AstronauticsNanjingChina

Insects that can perform flapping-wing flight,climb on a wall,and switch smoothly between the 2 locomotion regimes provide us with excellent biomimetic ***,very few biomimetic robots can perform complex locomotion tasks that combine the 2 abilities of climbing and ***,we describe an aerial–wall amphibious robot that is self-contained for flying and climbing,and that can seamlessly move between the air and *** adopts a flapping/rotor hybrid power layout,which realizes not only efficient and controllable flight in the air but also attachment to,and climbing on,the vertical wall through a synergistic combination of the aerodynamic negative pressure adsorption of the rotor power and a climbing mechanism with bionic adhesion *** the basis of the attachment mechanism of insect foot pads,the prepared biomimetic adhesive materials of the robot can be applied to various types of wall surfaces to achieve stable *** longitudinal axis layout design of the rotor dynamics and control strategy realize a unique cross-domain movement during the flying–climbing transition,which has important implications in understanding the takeoff and landing of ***,it enables the robot to cross the air–wall boundary in 0.4 s(landing),and cross the wall–air boundary in 0.7 s(taking off).The aerial–wall amphibious robot expands the working space of traditional flying and climbing robots,which can pave the way for future robots that can perform autonomous visual monitoring,human search and rescue,and tracking tasks in complex air–wall environments.

关键词： robot smoothly Vertical

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SLM铝合金表面喷射电沉积Ni-MoS_(2)自润滑复合涂层

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热加工工艺 2024年第8期53卷 63-68页

作者：柏华文成海霞陈亚娄桂宾沈理达田宗军南京航空航天大学机电学院江苏南京210016

采用喷射电沉积在SLM铝合金表面制备Ni-MoS_(2)自润滑复合涂层。用摩擦磨损试验机评价镀液中MoS_(2)浓度对Ni-MoS_(2)自润滑复合涂层摩擦磨损性能的影响。结果表明:共沉积MoS_(2)微粒能有效降低Ni-MoS_(2)自润滑复合涂层的摩擦系数和磨... 详细信息

采用喷射电沉积在SLM铝合金表面制备Ni-MoS_(2)自润滑复合涂层。用摩擦磨损试验机评价镀液中MoS_(2)浓度对Ni-MoS_(2)自润滑复合涂层摩擦磨损性能的影响。结果表明:共沉积MoS_(2)微粒能有效降低Ni-MoS_(2)自润滑复合涂层的摩擦系数和磨损率。与纯Ni涂层相比,Ni-MoS_(2)自润滑复合涂层与316L钢球对磨的摩擦系数和磨损率显著降低,摩擦系数从0.51降至0.12,磨损率从0.41 mg/m降至0.11 mg/m,为SLM铝合金表面改善摩擦学性能提供了参考。

关键词： Ni-MoS_(2)自润滑复合涂层喷射电沉积增材制造摩擦磨损

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In-situ deposition of apatite layer to protect Mg-based composite fabricated via laser additive manufacturing

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Journal of Magnesium and Alloys 2023年第2期11卷 629-640页

作者： Youwen Yang Changfu Lu lida shen Zhenyu Zhao Shuping Peng Cijun Shuai Institute of Bioadditive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013China Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China shenzhen Institute of Information Technology Shenzhen 518172China NHC Key Laboratory of Carcinogenesis School of basic Medical ScienceCentral South UniversityChangshaHunan 410013China School of energy and machinery engineering Jiangxi University of Science and TechnologyNanchang 330013China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China

Biodegradable magnesium(Mg) and its alloy show huge potential as temporary bone substitute due to the favorable biocompatibility and mechanical compatibility. However, one issue deserves attention is the too fast degradation. In this work, mesoporous bioglass(MBG)with high pore volume(0.59 cc/g) and huge specific surface area(110.78 m^(2)/g) was synthesized using improved sol-gel method, and introduced into Mg-based composite via laser additive manufacturing. Immersion tests showed that the incorporated MBG served as powerful adsorption sites, which promoted the in-situ deposition of apatite by successively adsorbing Ca2+and HPO42-. Such dense apatite film acted as an efficient protection layer and enhanced the corrosion resistance of Mg matrix, which was proved by the electrochemical impedance spectroscopy measurements. Thereby, Mg based composite showed a significantly decreased degradation rate of 0.31 mm/year. Furthermore,MBG also improved the mechanical properties as well as cell behavior. This work highlighted the advantages of MBG in the fabrication of Mg-based implant with enhanced overall performance for orthopedic application.

关键词： Laser addictive manufacture Mg-based composite Mesoporous bioglass In-situ deposition Degradation behavior

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Microstructure development and biodegradation behavior of additively manufactured Mg-Zn-Gd alloy with LPSO structure

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Journal of Materials Science & Technology 2023年第13期144卷 1-14页

作者： Youwen Yang Chenrong Ling Yageng Li Shuping Peng Deqiao Xie lida shen Zongjun Tian Cijun Shuai Institute of Additive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China The Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education Xiangya HospitalCentral South UniversityChangsha 410078China NHC Key Laboratory of Carcinogenesis of Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine Cancer Research InstituteSchool of Basic Medical ScienceCentral South UniversityChangsha 410013China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China

Biodegradable magnesium(Mg)alloy has been considered as a new generation of orthopedic implant ***,local corrosion usually occurs since the severe micro-galvanic behavior amongα-Mg and precipitates,and results in too rapid *** this study,porous Mg-Zn-Gd part was fabricated using laser additive manufacturing combined with solution heat *** heat treatment,the precipitatedβ-(Mg,Zn)_(3) Gd phase dissolved inα-Mg,and reduced the energy threshold of stacking faults on basal planes,which finally triggered the formation of long period stacking ordered(LPSO)*** LPSO phases owned minor potential difference withα-Mg,thus causing less micro-galvanic corrosion ten-dency as compared toβ-(Mg,Zn)_(3) Gd *** importantly,they were uniformly distributed within theα-Mg grains and showed different orientations between adjacent *** a result,the LPSO-reinforced Mg-Zn-Gd tended to expand laterally during corrosion evolution,and achieved uniform degradation with a considerably reduced degradation rate of 0.34 mm/***,in-vitro cell tests further proved its favorable *** work highlighted the additively manufactured Mg-Zn-Gd with LPSO structure showed great potential for orthopedic application.

关键词： Additive manufacturing Mg alloy LPSO structure Biodegradation behavior Biocompatibility

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A bifunctional bone scaffold combines osteogenesis and antibacterial activity via in situ grown hydroxyapatite and silver nanoparticles

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Bio-Design and Manufacturing 2021年第3期4卷 452-468页

作者： Youwen Yang Yun Cheng Fang Deng lida shen Zhenyu Zhao Shuping Peng Cijun Shuai Institute of Bioadditive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013China Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China shenzhen Institute of Information Technology Shenzhen 518172China NHC Key Laboratory of Carcinogenesis School of Basic Medical ScienceCentral South UniversityChangsha 410013China School of Energy and Machinery Engineering Jiangxi University of Science and TechnologyNanchang 330013China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China

Hydroxyapatite(HA)nanoparticles and silver(Ag)nanoparticles are expected to enable desirable bioactivity and antibac-terial properties on biopolymer ***,interfacial adhesion between HA/Ag and the biopolymer is poor due to the large physicochemical differences between these *** this study,poly L-lactic acid(PLLA)powder was first surface-modified with bioactive polydopamine(PDA)in an alkaline ***,HA and Ag nanoparticles were grown in situ on the PDA-coated PLLA powder,which was then adhered to the porous bone scaffold using a selective laser-sintering *** showed that HA and Ag nanoparticles were homogenously distributed in the matrix,with enhanced mechanical *** body fluid bioactivity tests showed that the in situ grown HA-endowed scaffold shows excellent *** vitro tests confirmed that the scaffold exhibits favorable biocompatibility with human umbilical cord mesenchymal stem cells,as well as strong antibacterial activity against Gram-negative Escherichia ***,in vivo assays indicated that the scaffold promoted bone generation,with a new bone area fraction of 71.8%after 8 weeks’implantation,without inflammation.

关键词： Bone scaffold In situ growth Hydroxyapatite Antibacterial properties Surface modification

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Simulation and Analysis of Electromagnetic Force in Laser Melting Deposition by Electromagnetic Impact

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第4期35卷 702-709页

作者： Xie Na Zhao Jianfeng Xie Deqiao Sun Jie Tian Zongjun shen lida College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics

Magnetic field was introduced in laser melting deposition to reduce the pores in *** 3-D model of the coil-deposition layer-substrate was *** results show that the electromagnetic force in deposition layer mainly concentrates in the projection area of the *** electromagnetic force shows repulsion in one *** experimental results indicate that the magnetic field is beneficial for grain refinement,microhardness increasement and decline of quantities and average sizes of pores.

关键词： laser melting deposition(LMD) finite element method electromagnetic force coil microstructure

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Trabecular-like Ti-6Al-4V scaffolds for orthopedic: fabrication by selective laser melting and in vitro biocompatibility

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Journal of Materials Science & Technology 2019年第7期35卷 1284-1297页

作者： Huixin Liang Youwen Yang Deqiao Xie Lan Li Ning Mao Changjiang Wang Zongjun Tian Qing jiang lida shen College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China Jiangxi University of Science and Technology Ganzhou 341000China Department of Sports Medicine and Adult Reconstructive Surgery Nanjing University Medical School Affiliated Drum Tower HospitalNanjing 210008China Department of Engineering and Design University of SussexSussex HouseBrighton BN19RHUnited Kingdom Suzhou fCangli Orthopedics Instrument Co. Ltd. Suzhou 215624China

Porous metal scaffolds play an important role in the orthopedic field, due to their wide applications in prostheses implantation. Some previous studies showed that the scaffolds with trabecular bone structure reconstructed via computed tomography had satisfactory biocompatibility. However, the reverse modeling scaffolds were inflexible for customized design. Therefore, a top-down designing biomimetic bone scaffold with favorable mechanical performances and cytocompatibility is urgently demanded for orthopedic implants. An emerging additive manufacturing technique, selective laser melting, was employed to fabricate the trabecular-like porous Ti-6Al-4 V scaffolds with varying irregularities(0.05-0.5) and porosities(48.83%–74.28%) designed through a novel Voronoi-Tessellation based method. Micro-computed tomography and scanning electron microscopy were used to characterize the scaffolds’ ***-static compression tests were performed to evaluate the scaffolds’ mechanical properties. The MG63 cells culture in vitro experiments, including adhesion, proliferation, and differentiation, were conducted to study the cytocompatibility of scaffolds. Compressive tests of scaffolds revealed an apparent elastic modulus range of 1.93–5.24 GPa and an ultimate strength ranging within 44.9–237.5 MPa, which were influenced by irregularity and porosity, and improved by heat treatment. Furthermore, the in vitro assay suggested that the original surface of the SLM-fabricated scaffolds was favorable for osteoblasts adhesion and migration because of micro scale pores and ravines. The trabecular-like porous scaffolds with full irregularity and higher porosity exhibited enhanced cells proliferation and osteoblast differentiation at earlier time, due to their preferable combination of small and large pores with various shapes. This study suggested that selective laser melting-derived Ti-6Al-4 V scaffold with the trabecular-like porous structure designed through Voronoi-Tessellation m

关键词： Irregular porous structure Selective laser melting Voronoi-Tessellation Mechanical performance In vitro study

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Preparation and characterization of nanostructured Al_2O_3-13wt.%TiO_2 ceramic coatings by plasma spraying

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Rare Metals 2009年第5期28卷 465-470页

作者： WANG Dongsheng TIAN Zongjun shen lida LIU Zhidong HUANG Yinhui Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

Nanostructured and conventional Al2O3-13wt.%TiO2 ceramic coatings were prepared by plasma spraying with nanostructured agglomerated and conventional powders, respectively. The microstructure and microhardness of the coatings were investigated using scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS）, and microhardness measurement. Meanwhile, the friction and wear behaviors were analyzed and compared using a ball-on-disk tribometer. The results show that the conventional coating has lamellar stacking characteristic and has some pores. However, the nanostructured coating shows a bimodal microstructure, which is composed of both fully melted regions and partially melted regions. According to the microstructural difference, the partially melted regions can be divided into liquid-phase sintered regions （a three-dimensional net or skeleton-like structure： Al2O3-rich submicron particles embedded in the TiO2-rich matrix） and solid-phase sintered regions （remained nanoparticles）. The microstructural characteristics of the liquid-phase sintered region are formed due to the selective melting of TiO2 nanoparticles during plasma spraying. On the other hand, the TiO2 and Al2O3 nanoparticles of the solid-phase sintered regions are all unmelted during plasma spraying. Due to the existence of nanostructured microstructures, the nanostructured coating has a higher microhardness, a lower friction coefficient, and a better wear resistance than the conventional coating.

关键词： surface coating nanostructured coating plasma spraying microstructure microhardness wear resistance

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Paleontology Knowledge Graph for Data-Driven Discovery

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Journal of Earth Science 2024年第3期35卷 1024-1034页

作者： Yiying Deng Sicun Song Junxuan Fan Mao Luo Le Yao Shaochun Dong Yukun Shi Linna Zhang Yue Wang Haipeng Xu Huiqing Xu Yingying Zhao Zhaohui Pan Zhangshuai Hou Xiaoming Li Boheng shen Xinran Chen Shuhan Zhang Xuejin Wu lida Xing Qingqing Liang Enze Wang School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and PaleoenvironmentChinese Academy of SciencesNanjing 210008China School of Earth Sciences and Engineering and Frontiers Science Center for Critical Earth Material Cycling Nanjing UniversityNanjing 210023China State Key Laboratory for Mineral Deposits Research Nanjing UniversityNanjing 210023China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China Centre for Research and Education on Biological Evolution and Environment Nanjing UniversityNanjing 210023China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesBeijing 100083China School of the Earth Sciences and Resources China University of GeosciencesBeijing 100083China

A knowledge graph(KG)is a knowledge base that integrates and represents data based on a graph-structured data model or *** have made efforts to construct geosciencerelated KGs to overcome semantic heterogeneity and facilitate knowledge representation,data integration,and text ***,there is currently no comprehensive paleontology KG or data-driven discovery based on *** this study,we constructed a two-layer model to represent the ordinal hierarchical structure of the paleontology KG following a top-down construction *** ontology containing 19365 concepts has been defined up to *** this basis,we derived the synonymy list based on the paleontology KG and designed corresponding online functions in the OneStratigraphy database to showcase the use of the KG in paleontological research.

关键词： paleontology knowledge graph ontology synonymy list OneStratigraphy big data ge-ology.

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扫描方式及激光重熔对激光选区熔化成形Inconel 718力学性能的影响

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热加工工艺 2023年第2期52卷 10-16页

作者：李军谢德巧吕非周凯沈理达南京航空航天大学机电学院江苏南京210016 南京航空航天大学能源与动力学院江苏南京210016 南京航空航天大学、江苏省精密与微细制造技术重点实验室江苏南京210016

采用激光选区熔化技术成形Inconel 718合金,通过对抗拉强度、断后延伸率、硬度和致密度以及组织形貌的探讨,研究了扫描方式及激光重熔的工艺对Inconel 718合金力学性能的影响。结果表明,扫描方式和激光重熔对力学性能都有一定的影响。... 详细信息

采用激光选区熔化技术成形Inconel 718合金,通过对抗拉强度、断后延伸率、硬度和致密度以及组织形貌的探讨,研究了扫描方式及激光重熔的工艺对Inconel 718合金力学性能的影响。结果表明,扫描方式和激光重熔对力学性能都有一定的影响。扫描方式对抗拉强度影响较大,对致密度影响较小,连续型扫描的抗拉强度最高为1059 MPa且高于铸件,不同扫描方式下的断后延伸率均高于21%;激光重熔减少了孔隙缺陷,致密度提高至99%以上,但会引发晶粒粗化和裂纹扩展,重熔前后不同扫描方式样件的抗拉强度差别都小于1%。在高温下,连续型扫描下的断后伸长率提高了15%。

关键词：激光选区熔化 Inconel 718 扫描方式激光重熔力学性能

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