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Granular Ionogel Particle Inks for 3D Printed Tough and Stretchable Ionotronics

Research 2024年第1期2023卷 429-442页

作者： Yuan Yao Yue Hui Zhenhua Wang Hehao Chen Heng Zhu Nanjia Zhou Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024Zhejiang ProvinceChina Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024Zhejiang ProvinceChina School of Chemical Engineering and Advanced Materials the University of AdelaideAdelaide 5005South AustraliaAustralia State Key Laboratory of Fluid Power&Mechatronic System Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceCenter for X-MechanicsDepartment of Engineering MechanicsZhejiang UniversityHangzhou 310027China

Ionogels have garnered great attention as promising soft conducting materials for the fabrication of flexible energy storage devices,soft actuators,and ***,the leakage of the ionic liquids,weak mechanical strength,and poor manufacturability have greatly limited their reliability and ***,we propose a new ionogel synthesis strategy by utilizing granular zwitterionic microparticles to stabilize ionic *** ionic liquids swell the microparticles and physically crosslink microparticles via either electronic interaction or hydrogen *** introducing a photocurable acrylic monomer enables the fabrication of double-network(DN)ionogels with high stretchability(>600%)and ultrahigh toughness(fracture energy>10 kJ/m^(2)).The synthesized ionogels exhibit a wide working temperature of−60 to 90℃.By tuning the crosslinking density of microparticles and physical crosslinking strength of ionogels,we synthesize DN ionogel inks and print them into three-dimensional(3D)*** ionogelbased ionotronics are 3D printed as demonstrations,including strain gauges,humidity sensors,and ionic skins made of capacitive touch sensor *** covalently linking ionogels with silicone elastomers,we integrate the ionogel sensors onto pneumatic soft actuators and demonstrate their capacities in sensing large *** our last demonstration,multimaterial direct ink writing is harnessed to fabricate highly stretchable and durable alternating-current electroluminescent devices with arbitrary *** printable granular ionogel ink represents a versatile platform for the future manufacturing of ionotronics.

关键词： crosslinking utilizing gauge

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HabitAction: A Video Dataset for Human Habitual Behavior Recognition

arXiv

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arXiv 2024年

作者： Li, Hongwu Zhang, Zhenliang Wang, Wei The State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150080 China Beijing100080 China

Human Action Recognition (HAR) is a very crucial task in computer vision. It helps to carry out a series of downstream tasks, like understanding human behaviors. Due to the complexity of human behaviors, many highly valuable behaviors are not yet encompassed within the available datasets for HAR, e.g., human habitual behaviors (HHBs). HHBs hold significant importance for analyzing a person’s personality, habits, and psychological changes. To solve these problems, in this work, we build a novel video dataset to demonstrate various HHBs. These behaviors in the proposed dataset are able to reflect internal mental states and specific emotions of the characters, e.g., crossing arms suggests to shield oneself from perceived threats. The dataset contains 30 categories of habitual behaviors including more than 300,000 frames and 6,899 action instances. Since these behaviors usually appear at small local parts of human action videos, it is difficult for existing action recognition methods to handle these local features. Therefore, we also propose a two-stream model using both human skeletons and RGB appearances. Experimental results demonstrate that our proposed method has much better performance in action recognition than the existing methods on the proposed dataset. All the dataset and codes are available at ***/view/hhb30. Copyright © 2024, The Authors. All rights reserved.

关键词： Video analysis

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In-situ measurement and modeling of mechanical properties of porcine oocytes

In-situ measurement and modeling of mechanical properties of...

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第43届中国控制会议

作者： Yu Cai Yaowei Liu Qili Zhao Mingzhu Sun Mao Sheng Cui Xin Zhao Yue Du Institute of Robotics and Automatic Information System The Tianjin Key Laboratory of Intelligent RoboticsNankai University The Department of Information Technology Qinghai University

ISBN: (数字)9789887581581

ISBN: (纸本)9798350366907

The quality of porcine oocytes determines the developmental potential of early porcine embryos, while the quality of porcine oocytes can be qualitatively described by their mechanical properties. In previous studies, porcine oocytes were often considered as a homogeneous spheroid, which was clearly contrary to its physiological structure consisting of multiple layers of components from the inside out. In this study, we first measured the mechanical properties of different subcellular components of porcine oocytes in situ using atomic force microscopy(AFM). The whole porcine oocyte and cytoplasm were subjected to multiple single-point indentations in situ under ramp mode, and the Young's modulus was obtained by fitting the force curve with the Sneddon model. In ramp mode, when the preset force was reached, the magnitude of the force was kept unchanged and the change of probe position was recorded to obtain the viscoelastic properties of each subcellular component. Then, a finite element model of porcine oocytes was established. Finally, we performed narrow-neck pipette pass-through experiments and suction penetration experiments of porcine oocytes to verify the accuracy of our model. The finite element model of porcine oocytes established by us is of great significance for further study of oocyte micromanipulation under different conditions.

关键词： Oocyte Mechanical Properties In-situ measurements Finite element model

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Satellite altimeter observed surface water increase across lake-rich regions of the Arctic

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The Innovation 2024年第6期5卷 29-30页

作者： Nan Xu Wenyu Li Peng Gong Hui Lu College of Geography and Remote Sensing Key Laboratory of Hydrologic-Cycle and Hydrodynamic-System of Ministry of Water ResourcesHohai UniversityNanjing 210098China Department of Geography and Planning University of TorontoTorontoON M5S 3G3Canada Department of Geography Department of Earth ScienceUniversity of Hong KongHong Kong 999077China Department of Earth System Science Ministry of Education Key Laboratory for Earth System ModelingInstitute for Global Change StudiesTsinghua UniversityBeijing 100084China State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing 100084China Tsinghua University(Department of Earth System Science)-Xi’an Institute of Surveying and Mapping Joint Research Center for Next-Generation Smart Mapping Beijing 100084China

On our planet,the Arctic region has numerous and widely distributed *** lakes are fundamental components of regional water cycles,carbon cycles,and the energy balance and also play a crucial role in providing habitats for wildlife,maintaining biodiversity,and supplying *** to satellite observations,in situ measurements,and climate models,the Arctic is the fastest-warming region on Earth.

关键词： Arctic warming Earth

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Changes in albedo and its radiative forcing of grasslands in East Asia drylands

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Ecological Processes 2024年第1期13卷 237-251页

作者： Qingsong Zhu Jiquan Chen Liangxu Wu Yuting Huang Changliang Shao Gang Dong Zhe Xu Xianglan Li State Key Laboratory of Remote Sensing Science College of Global Change and Earth System ScienceFaculty of Geographical ScienceBeijing Normal UniversityBeijingChina Department of Geography Environmentand Spatial SciencesMichigan State UniversityEast LansingMI 48823USA State Key Laboratory of Efficient Utilization of Arid and Semi‑Arid Arable Land in Northern China National Hulunber Grassland Ecosystem Observation and Research StationInstitute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijingChina School of Life Science Shanxi UniversityTaiyuanChina

Background Grasslands in drylands are increasingly influenced by human activities and climate change,leading to alterations in albedo and radiative energy balance among *** biophysical properties and their interactions change greatly following ***,our understanding of these processes and their climatic impacts remains *** this study,we used multi-year observations from satellites and eddy-covariance towers to investigate the response of albedo to variables closely associated with human disturbances,including vegetation greenness(EVI)and surface soil volumetric water content(VWC),as well as snow cover and clearness index(T_(a))for their potential *** EVI and VWC during the growing season were the primary factors influencing *** and VWC were negatively correlated with albedo,with VWC's total direct and indirect impacts being slightly smaller than those of *** the non-growing season,snow cover was the most influential factor on *** and Ta negatively affected albedo throughout the *** estimated the impact of variations in EVI and VWC on climate to be in the range of 0.004 to 0.113 kg CO_(2)m^(-2)yr^(-1)in CO_(2)*** This study indicates the significant impacts of climate change and human disturbances on vulnerable grassland ecosystems from the perspective of altered *** in vegetation greenness and soil properties induced by climate change and human activities may have a substantial impact on albedo,which in turn feedback on climate change,indicating that future climate policies should take this factor into consideration.

关键词： Albedo Global warming potential Grassland Disturbance

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Thermally Drawn Monolithic Polymer Continuum Robot with Laser Cutting Profile

Thermally Drawn Monolithic Polymer Continuum Robot with Lase...

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2023 IEEE International Conference on robotics and Biomimetics, ROBIO 2023

作者： Liu, Huanghua Zou, Yun Xu, Zheng Gao, Anzhu Shanghai Jiao Tong University Institute of Medical Robotics Department of Automation China Ministry of Education Key Laboratory of System Control and Information Processing Shanghai200240 China Institute of Medical Robotics Shanghai Jiao Tong University Shanghai200240 China

ISBN: (纸本)9798350325706

Continuum robots have the great potential in endoluminal diagnosis and intervention toward narrow and confined workspace. However, fabrication of continuum robots still poses a grant challenge in its miniaturization. To solve this, this paper designs a thermally drawn monolithic polymer continuum robot with laser cutting profile. First, the continuum robot is designed with two degrees of freedom (DOF) for shape deflection, and it consists of four optical fibers with the fiber Bragg grating (FBG) sensor on each for tension sensing as driving cables. Second, its main body is a multi-channel polycarbonate (PC) tube produced by thermal drawing process, and a series of rectangular cutouts are made on it via laser cutting process. By combining these two fabrication processes, the developed continuum robot realizes the integration of the multi-channel structure and the notch feature. Third, a control framework of puller-follower controller using the integrated tension sensing is proposed for teleoperation control. Finally, experimental setup is built for the robot validation, and results show that the repeated positioning accuracy of the robot is 1.08 mm. Moreover, a micro endoscope and a needle are added to the end of the continuum robot, and a phantom study of auripuncture and drug delivery is completed to verify the preliminary feasibility. And the proposed fabrication approach enables the miniaturization and complex structure for the cable-driven continuum robots. © 2023 IEEE.

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Design, Analysis, and Experiment of a Novel Ultrasonic Printing system

Design, Analysis, and Experiment of a Novel Ultrasonic Print...

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2022 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale, 3M-NANO 2022

作者： Pei, Zhichao Zhao, Haoxiang Li, Dongjie Wang, Lefeng Rong, Weibin Sun, Lining Harbin Institute of Technology State Key Laboratory of Robotics and Systems Harbin China Harbin University of Science and Technology Heilongjiang Provincial Key Laboratory of Complex Intelligent System and Integration Harbin China

ISBN: (数字)9781665475433

ISBN: (纸本)9781665475433

Ultrasonic-driven printing technology is widely used in bioprinting because of its high precision, good biocompatibility, and low cost. However, the conventional ultrasonic printing technology still has problems such as cross-contamination of bio-ink during storage, transportation, and processing, and cumbersome ink replacement process. Therefore, a new ultrasonic printing device is developed in this paper, which uses PZT plates as the driving element. And a fluid sub-system has been fabricated based on the self-made glass micro-nozzle, which is connected to the drive element using ultrasonic couplant gel. The separation of the fluid system and the drive system has been realized through the modular design, thereby realizing the rapid replacement of different inks and this relatively independent fluid system is of great benefit to better sealing and aseptic operation. In addition, a digital model is built to analyze its working mechanism. And an experimental system is established to characterize the performance of the device. The results show that the system can generate droplets stably and accurately, and the droplet volume can be controlled by the excitation voltage amplitude and pulse width. © 2022 IEEE.

关键词： Biocompatibility

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Air pollution health burden embodied in China's supply chains

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Environmental Science and Ecotechnology 2023年第4期16卷 147-155页

作者： Hongyan Zhao Ruili Wu Yang Liu Jing Cheng Guannan Geng Yixuan Zheng Hezhong Tian Kebin He Qiang Zhang Center for Atmospheric Environmental Studies School of EnvironmentBeijing Normal UniversityBeijing100875China Ministry of Education Key Laboratory for Earth System Modelling Department of Earth System ScienceTsinghua UniversityBeijing100084China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China State Environmental Protection Key Laboratory of Quality Control in Environmental Monitoring China National Environmental Monitoring CentreBeijing100012China Center of Air Quality Simulation and System Analysis Chinese Academy of Environmental PlanningBeijing100012China

Product trade plays an increasing role in relocating production and the associated air pollution impact among sectors and *** a comprehensive depiction of atmospheric pollution redistribution through trade chains is missing,which may hinder targeted clean air cooperation among sectors and ***,we combined five state-of-the-art models from physics,economy,and epidemiology to track the anthropogenic fine particle matters(PM_(2.5))related premature mortality along the supply chains within China in *** results highlight the key sectors that affect PM_(2.5)-related mortality from both production and consumption *** consumption-based effects from food,light industry,equipment,construction,and services sectors,caused 2e22 times higher deaths than those from a production perspective and totally contributed 63%of the national *** a cross-boundary perspective,25.7%of China's PM_(2.5)-related deaths were caused by interprovincial trade,with the largest transfer occurring from the central and northern regions to well-developed east coast *** investment dominated the cross-boundary effect(56%of the total)by involving substantial equipment and construction products,which greatly rely on product exports from regions with specific *** supply chain-based analysis provides a comprehensive quantification and may inform more effective joint-control efforts among associated regions and sectors from a health risk perspective.

关键词： China Air pollution Mortality Trade Supply chain

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Exploring the Effects of Different Windowing Methods on Asynchronous SSVEP-Based Brain-Computer Interface

Exploring the Effects of Different Windowing Methods on Asyn...

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2024 IEEE International Conference on robotics and Biomimetics, ROBIO 2024

作者： Li, Songwei Meng, Jianjun Shanghai Jiao Tong University Department of Mechanical Engineering Shanghai China Shanghai Jiao Tong University State Key Laboratory of Mechanical System and Vibration Shanghai China

ISBN: (纸本)9781665481090

In the field of asynchronous brain-computer interfaces, various algorithms and preprocessing methods are used to improve the performance of asynchronous control. However, few studies have explored the effects of different windowing methods. This study examines the impact of windowing methods on the performance of a 4-class asynchronous SSVEP brain-computer interface. We collected data from 7 subjects and conducted asynchronous SSVEP offline data analysis to verify the sequence and shape effects of windowing. The results show that while keeping the FPR almost unchanged, using weighted average windows before CCA provided a 20% faster reaction time;meanwhile, using exponential decay windows significantly shortened the reaction time by 6-8%. Therefore, compared to the worst window method, using the optimal window provides a significant performance improvement of 26%. This shows that choosing a suitable windowing method in an asynchronous brain-computer interface can effectively improve asynchronous performance in terms of reaction time. © 2024 IEEE.

关键词： Interfaces (computer)

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Acoustic soft metacollimator by broadband digital phase encoding

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Physical Review Applied 2024年第1期22卷 014065-014065页

作者： Erqian Dong Jinhu Zhang Xiaochun Su Zhanyuan Gao Chen Yang Zhenyu Wang Nicholas X. Fang Yu Zhang State Key Laboratory of Marine Environmental Science Key Laboratory of Underwater Acoustic Communication and Marine Information Technology of the Ministry of Education College of Ocean and Earth Sciences Department of Mechanical Engineering State Key Laboratory of Robotics Shenyang Institute of Automation

Phase engineering plays a pivotal role in various scientific research and industrial applications including microwaves, optics, and acoustics. However, traditional phase engineering methods lack the flexibility for arbitrary programming due to the absence of digitization. Conversely, while broadband digitization technology holds promise, its utilization in wave engineering has been constrained by narrowband transmission capabilities. In this study, we introduce a novel approach to broadband digital phase encoding spanning frequencies from 50 to 500 kHz. Our methodology is exemplified through the development of an acoustic soft metacollimator with simulations and experiments conducted underwater across different frequency ranges. Our findings demonstrate that the soft metacollimator significantly enhances transmission intensity by 7.7 dB and improves spatial resolution by a factor of 10. Moreover, the soft metacollimator enables novel functionalities such as long-distance energy enhancement and broadband coding properties in underwater acoustics. This pioneering broadband digital phase encoding technique holds promise for advancing next-generation phase engineering and offers versatile applications in biomedical ultrasonics, acoustic communications, and the development of underwater broadband acoustic antennas.

关键词： Acoustic metamaterials Applications of soft matter Sound generation Underwater acoustics Devices Smart materials Acoustic techniques Ultrasound techniques

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