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Detachment Behavior of Gecko Toe in Functional Strategies for Bionic Toe

Journal of Bionic Engineering 2024年第2期21卷 707-717页

作者： Qingfei Han wei Wang Huan Shen Xincheng Feng Haoran Zhang Qian Li Yi Sun huapeng Wu Aihong Ji Lab of Locomotion Bioinspiration and Intelligent Robots College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjing210016China Laboratory of Intelligent Machines School of Energy SystemsLappeenranta-Lahti University of Technology53850LappeenrantaFinland State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and AstronauticsNanjing210016China

Geckos can efficiently navigate complex terrains due to their multi-level adhesive system that is present on their toes.The setae are responsible for the gecko’s extraordinary adhesion and have garnered wide attention from the scientific community.The majority of the reported works in the literature that have dealt with the peeling models mainly focus on the gecko hierarchical adhesive system,with limited attention given to investigating the influence of gecko toe structure on the detachment.Along these lines,to gain a deeper understanding of the rapid and effortless detachment abilities of gecko toes,the peeling behavior of gecko toes on vertical surfaces was primarily investigated in this work.More specifically,the detachment time of a single toe on a smooth acrylic plate was measured to be 0.41±0.21 s.Moreover,it was observed that the toe assumed a"U"-shaped structure upon complete detachment.Additionally,Finite Element Analysis(FEA)models for three different types of gecko toes were developed to simulate both the displacement-peel and the moment-peel modes.Increasing the segmentation of the adhesive layer led to a gradual decrease in the resultant force,as well as the normal and tangential components.Lastly,a gecko-inspired toe model was constructed and powered by Shape Memory Alloy(SMA).A systematic comparison between the vertical drag separation and the outward flip separation was also conducted.From our analysis,it was clearly demonstrated that outward peel separation significantly necessitated the reduction of the peeling force,thus confirming the advantageous nature of the outward motion in gecko toe detachment.Our data not only contribute to a deeper understanding of the gecko detachment behavior but also offer valuable insights for the advancement of the wall-climbing robot feet.

关键词： Gecko toes Detachment behavior Finite element analysis Gecko-inspired toe

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Transformers in computational visual media:A survey

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Computational Visual Media 2022年第1期8卷 33-62页

作者： Yifan Xu huapeng wei Minxuan Lin Yingying Deng Kekai Sheng Mengdan Zhang Fan Tang weiming Dong Feiyue Huang Changsheng Xu NLPR Institute of AutomationChinese Academy of SciencesBeijing 100190China School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100040China School of Artificial Intelligence Jilin UniversityChangchun 130012China Youtu Lab Tencent Inc.Shanghai 200233China CASIA-LLVISION Joint Lab Beijing 100190China

Transformers,the dominant architecture for natural language processing,have also recently attracted much attention from computational visual media researchers due to their capacity for long-range representation and high performance.Transformers are sequence-to-sequence models,which use a selfattention mechanism rather than the RNN sequential structure.Thus,such models can be trained in parallel and can represent global information.This study comprehensively surveys recent visual transformer works.We categorize them according to task scenario:backbone design,high-level vision,low-level vision and generation,and multimodal learning.Their key ideas are also analyzed.Differing from previous surveys,we mainly focus on visual transformer methods in low-level vision and generation.The latest works on backbone design are also reviewed in detail.For ease of understanding,we precisely describe the main contributions of the latest works in the form of tables.As well as giving quantitative comparisons,we also present image results for low-level vision and generation tasks.Computational costs and source code links for various important works are also given in this survey to assist further development.

关键词： visual transformer computational visual media(CVM) high-level vision low-level vision image generation multi-modal learning

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集中模式下的省内寄递邮运网络综合管控分析研究

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邮政研究 2024年第2期40卷 60-65页

作者：尚炜许红亮张华鹏邹亮任亮中国邮政集团有限公司河南省信息技术中心河南郑州450000

随着邮政寄递改革的深入推进,为支撑“两集中”模式下的邮运网络管控,强化IT赋能和数据赋能。中国邮政集团有限公司河南省分公司结合本区域实际,深化业技融合,重点围绕邮车装载体积测算、邮件体积测算、入网邮件量预测分析、运输要素管... 详细信息

随着邮政寄递改革的深入推进,为支撑“两集中”模式下的邮运网络管控,强化IT赋能和数据赋能。中国邮政集团有限公司河南省分公司结合本区域实际,深化业技融合,重点围绕邮车装载体积测算、邮件体积测算、入网邮件量预测分析、运输要素管控等方面,开展邮运网络综合管控分析研究,助力企业提质增量、降本增效,推进省内寄递网运生产高质量发展。

关键词： “两集中” 机器学习图像识别回归预测运输要素后评估

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Mold-free self-assembled scalable microlens arrays with ultrasmooth surface and record-high resolution

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Light(Science & Applications) 2023年第7期12卷 1318-1326页

作者： Zhihao Liu Guangwei Hu huapeng Ye Miaoyang wei Zhenghao Guo Kexu Chen Chen Liu Biao Tang Guofu Zhou Guangdong Provincial Key Laboratory of Optical Information Materials and Technology&Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China National Center for International Research on Green Optoelectronics South China Normal UniversityGuangzhou 510006China School of Electrical and Electronic Engineering 50 Nanyang AvenueNanyang Technological UniversitySingapore 639798Singapore Shenzhen Guohua Optoelectronics Tech.Co.Ltd Shenzhen 518110China

Microlens arrays(MLAs)based on the selective wetting have opened new avenues for developing compact and miniaturized imaging and display techniques with ultrahigh resolution beyond the traditional bulky and volumetric optics.However,the selective wetting lenses explored so far have been constrained by the lack of precisely defined pattern for highly controllable wettability contrast,thus limiting the available droplet curvature and numerical aperture,which is a major challenge towards the practical high-performance MLAs.Here we report a mold-free and self-assembly approach of mass-production of scalable MLAs,which can also have ultrasmooth surface,ultrahigh resolution,and the large tuning range of the curvatures.The selective surface modification based on tunable oxygen plasma can facilitate the precise pattern with adjusted chemical contrast,thus creating large-scale microdroplets array with controlled curvature.The numerical aperture of the MLAs can be up to 0.26 and precisely tuned by adjusting the modification intensity or the droplet dose.The fabricated MLAs have high-quality surface with subnanometer roughness and allow for record-high resolution imaging up to equivalently 10,328 ppi,as we demonstrated.This study shows a cost-effective roadmap for mass-production of high-performance MLAs,which may find applications in the rapid proliferating integral imaging industry and high-resolution display.

关键词： record pattern precise

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新型冠状病毒感染并发呼吸机相关性肺炎的感染特征

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热带医学杂志 2024年第4期24卷 470-474页

作者：段鸿露郑芳莉许玉成于化鹏王君丽赵卫李华南方医科大学公共卫生学院广东广州510515 南方医科大学深圳医院呼吸与危重症医学科广东深圳518110 深圳市福田区疾病预防控制中心传染病管理科广东深圳518040

目的了解行机械通气的新型冠状病毒感染患者发生呼吸机相关性肺炎(VAP)的概率、影响因素和感染的病原菌分布。方法回顾性统计深圳某综合医院2022年10月1日-2023年9月30日收治的733例行机械通气住院患者的临床资料和病原学检查结果,感染... 详细信息

目的了解行机械通气的新型冠状病毒感染患者发生呼吸机相关性肺炎(VAP)的概率、影响因素和感染的病原菌分布。方法回顾性统计深圳某综合医院2022年10月1日-2023年9月30日收治的733例行机械通气住院患者的临床资料和病原学检查结果,感染新型冠状病毒的患者为Cov组(n=112),非新冠的其他感染患者为n-Cov组(n=621);Cov合并VAP者为Cov-VAP组(n=37),n-Cov合并VAP者为n-Cov-VAP组(n=95)。对各组相关临床资料进行分析。结果Cov组患肾功能不全、慢性肾脏病、冠心病、心力衰竭/心功能不全、呼吸衰竭、贫血等基础疾病的比例分别为23.2%(26/112)、9.8%(11/112)、16.1%(18/112)、19.6%(22/112)、40.2%(45/112)、35.7%(40/112),显著高于n-Cov组,差异均有统计学意义(χ^(2)=9.189、4.881、4.357、14.981、63.312、17.630,P均<0.05)。Cov-VAP组中患糖尿病、心力衰竭/心功能不全的比例分别为48.6%(18/37)和24.3%(9/37),显著高于n-Cov-VAP组,差异均有统计学意义(χ^(2)=11.843、6.002,P均<0.05)。Cov-VAP组死亡率为43.2%(16/37),显著高于n-Cov-VAP组22.1%(21/95),差异有统计学意义(χ^(2)=5.898,P<0.05)。Cov-VAP组的呼吸道标本共分离出25株病原菌,主要病原菌依次为鲍曼不动杆菌(6株)、铜绿假单胞菌(4株)、肺炎克雷伯菌(4株)、嗜麦芽窄食单胞菌(4株);n-Cov-VAP组的呼吸道标本共分离出27株病原菌,主要病原菌依次为嗜麦芽窄食单胞菌(9株)、铜绿假单胞菌(7株)、肺炎克雷伯菌(6株),未分离出鲍曼不动杆菌。结论VAP在行机械通气的新型冠状病毒患者中有较高的发病率和死亡率,高龄、患有肾功能不全、冠心病等基础疾病是高危因素,感染的病原菌主要为革兰阴性菌。

关键词：新型冠状病毒肺炎呼吸机相关性肺炎病原菌

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Infrared stimulated emission with an ultralow threshold from low-dislocation-density InN films grown on a vicinal GaN substrate

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Fundamental Research 2022年第5期2卷 794-798页

作者： huapeng Liu Bowen Sheng Tao Wang Konstantin Kudryavtsev Artem Yablonskiy Jiaqi wei Ali Imran Zhaoying Chen Ping Wang Xiantong Zheng Renchun Tao Xuelin Yang Fujun Xu weikun Ge Bo Shen Boris Andreev Xinqiang Wang State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China Institute for Physics of Microstructures Russian Academy of SciencesNizhny Novgorod 603950Russia Collaborative Innovation Center of Quantum Matter Beijing 100871China

Near-infrared stimulated emission from a high-quality InN layer under optical pumping was observed with a threshold excitation power density of 0.3 and 4 kW cm^(−2) at T=8 and 77 K,respectively.To achieve such a low threshold power density,vicinal GaN substrates were used to reduce the edge-component threading dislocation(ETD)density of the InN film.Cross-sectional transmission electron microscopy images reveal that the annihilation of ETDs can be divided into two steps,and the ETD density can be reduced to approximately 5×10^(8) cm^(−2) near the surface of the 5-μm-thick film.The well-resolved phonon replica of the band-to-band emission in the photoluminescence spectra at 9 K confirm the high quality of the InN film.As a result,the feasibility of InN-based photonic structures and the underlying physics of their growth and emission properties are demonstrated.

关键词： InN Stimulated emission Vicinal substrate Phonon replica Molecular beam epitaxy

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认罪认罚自愿性的话语表达与实践逻辑

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中国政法大学学报 2023年第5期 100-110页

作者：魏化鹏《上海政法学院学报》编辑部

时至今日,认罪认罚从宽制度已经进入实践的深水区,在程序运行和制度设计层面凸显出来的问题不一而足,如法检两家对确定刑量刑建议的认识并未统一,速裁程序的适用率不高等,但综观全局,制度的核心还是认罪认罚自愿性和真实性的保障问题。... 详细信息

时至今日,认罪认罚从宽制度已经进入实践的深水区,在程序运行和制度设计层面凸显出来的问题不一而足,如法检两家对确定刑量刑建议的认识并未统一,速裁程序的适用率不高等,但综观全局,制度的核心还是认罪认罚自愿性和真实性的保障问题。其中,值班律师功能的虚化,量刑建议协商性不足,量刑协商过程呈现单向和压制性,被告人对量刑协商参与不充分等因素,对于认罪认罚自愿性的保障都是不利的。本文以实践为样本,着眼于审前和庭审程序,重新审视认罪认罚自愿性保障问题,并提出“问答式”的庭审审查程序等制度设计。

关键词：认罪认罚自愿性 “问答式” 量刑协商

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ZIF-L晶体尺寸与形貌调控及其吸附性能研究

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化工新型材料 2023年第7期51卷 190-195,201页

作者：宋华朋王晓东黄伟太原理工大学省部共建煤基能源清洁高效利用国家重点实验室太原030024

分别通过改变合成温度,以1-甲基咪唑为配体调节剂,CTAB和PVP做封端剂调控了ZIF-L晶体的形貌和尺寸,并考察了制备的ZIF-L晶体对苯酚溶液中苯酚的吸附性能。结果表明:PVP对ZIF-L晶体的调控效果最好,可以得到单分散、棒状、粒径均一的ZIF-... 详细信息

分别通过改变合成温度,以1-甲基咪唑为配体调节剂,CTAB和PVP做封端剂调控了ZIF-L晶体的形貌和尺寸,并考察了制备的ZIF-L晶体对苯酚溶液中苯酚的吸附性能。结果表明:PVP对ZIF-L晶体的调控效果最好,可以得到单分散、棒状、粒径均一的ZIF-L晶体,晶体最小可达1.5μm;改变合成温度,可以得到2μm的叶片状晶体;均小于目前文献报道的5.6μm的叶片状晶体。棒状晶体对苯酚溶液中的苯酚显示出良好的吸附性能,1.5μm棒状ZIF-L晶体在25℃下,对苯酚的吸附量可达21.9mg/g,与文献报道的对苯酚有吸附能力的其他材料相比,显示出一定的优势。

关键词： ZIF-L晶体尺寸形貌吸附

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Effects of scutellarin on PKG in HCMECs after hypoxia roxygenation

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中国药理学与毒理学杂志 2015年第S1期29卷 33-34页

作者： YangLI Zhi-yingWENG MinZHANG ChenCHEN Xiao-huaDU Pei-huapeng Wen-juanWU XuanLIU wei-minYANG School of Pharmaceutical Science & Yunnan Key Laboratory of Pharmacology for Natural Products Kunming Medical University Kumming 650500 China First Affiliated Hospital of Kunming Medical University Kumming 650032 China Shanghai Institute of Materia Medica Chinese Academy of Sciences Shanghai 201203 China

OBJECTIVE This study discusses the effects of scutellarin(SCU),which is one of effective component of Erigeron breviscapus(Vant.)Hand-Mazz,on cGMP dependent protein kinase(PKG)in human cardiac microvascular endothelial cells(HCMECs)after hypoxia roxygenation(HR).METHODS Based on a model of HCMECs cells with HR injury,cell viability is examined by MTT assay.Protein expression of PKG is analyzed by Western blotting and its enzyme activity is investigated by ELISA technology.RESULTS The results of MTT assay- indicate that SCU(1,10μmol·L1)could protect HCMECs against HR injury.SCU(0.1,1 and 10μmol·L-1)canenhance PKG-I expression in control and HR injury cells.Furthermore,SCU(1,10μmol·L-1 significantly increase PKG activity in control cells(P<0.01),and also SCU(100μmol·L-1)appears similar on enzyme activity in HR injury cells(P <0.05).CONCLUSION SCU appears protective effects on endothelial cells against HR damage.While its mechanisms may be related to the influence of SCU on PKG activity in HCMECs.

关键词： scutellarin hypoxia roxygenation PKG human cardiac

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基于正交实验法的弓网耦合除冰数值模拟

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南京航空航天大学学报:英文版 2023年第S1期40卷 29-41页

作者：吴磊徐梦楠张华鹏吴蔚丁建明西南交通大学机械工程学院成都610031 中国空气动力研究与发展中心结冰与防除冰重点实验室绵阳621000 西南交通大学牵引动力国家重点实验室成都610031

基于正交实验方法和有限元仿真方法,设计五因素四水平正交实验表,研究了作业速度、覆冰厚度、弓头质量、弓头刚度以及弓头阻尼对除冰率的影响。建立了接触网‑覆冰有限元模型和受电弓‑接触网耦合有限元模型,并通过对比理论值和仿真值验... 详细信息

基于正交实验方法和有限元仿真方法,设计五因素四水平正交实验表,研究了作业速度、覆冰厚度、弓头质量、弓头刚度以及弓头阻尼对除冰率的影响。建立了接触网‑覆冰有限元模型和受电弓‑接触网耦合有限元模型,并通过对比理论值和仿真值验证了有限元模型的准确性。仿真结果表明:作业速度和弓头质量对接触力和接触线抬升量影响较大,进而影响除冰率,但弓头质量大于17 kg后影响程度趋于平缓。正交实验结果表明:列车运行速度、弓头质量和覆冰厚度是影响除冰率的主要因素,而弓头刚度和阻尼对除冰率影响不显著。这些结果可为提高列车行驶安全性、改善弓网耦合除冰技术提供参考。

关键词：正交试验法有限元分析弓网耦合机械除冰

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