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Fatigue-resistant Hydrogels

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Chemical Research in Chinese Universities 2024年第1期40卷 64-77页

作者： LI Luofei LEI Hai CAO Yi Collaborative Innovation center of Advanced Microstructures National Laboratory of Solid State MicrostructureDepartment of PhysicsNanjing UniversityNanjing 210093P.R.China Department of Physics Zhejiang UniversityHangzhou 310027P.R.China

Hydrogels have been extensively studied for applications in various fields, such as tissue engineering and soft robotics, as determined by their mechanical properties. The mechanical design of hydrogels typically focuses on the modulus, toughness, and deformability. These characteristics play important roles and make great achievements for hydrogel use. In recent years, a growing body of research has concentrated on the fatigue property of hydrogels, which determines their resistance to crack propagation in the networks during cyclic mechanical loads for applications. However, knowledge of hydrogel fatigue behavior remains notably deficient. Here, we present a brief overview of the fatigue behavior of hydrogels, encompassing the general experimental methods to measure the fatigue property and fundamental theoretical calculation models. Then, we highlight multiple strategies to enhance the fatigue resistance of hydrogels. Finally, we present our perspectives on fatigue-resistant hydrogels, outstanding challenges and potential directions for future research.

关键词： Hydrogel Fatigue-resistant Fracture

Broad Federated Meta-Learning of Damaged Objects in Aerial Videos

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Computer Modeling in Engineering & Sciences 2023年第12期137卷 2881-2899页

作者： Zekai Li Wenfeng Wang School of Aerospace Engineering Xi’an Jiaotong UniversityXi’an710049China Research Institute of intelligent Engineering and Data Applications Shanghai Institute of TechnologyShanghai201418China Research center for Ecology and Environment of Central Asia Chinese Academy of SciencesUrumqi830011China Applied Nonlinear Science Lab Anand International College of EngineeringJaipur391320India Department of Visual Engineering International Academy of Visual Art and EngineeringLondonCR26EQUK Institute of intelligent Management and Technology Sino-Indian Joint Research Center of AI and RoboticsBhubaneswar752054India

We advanced an emerging federated learning technology in city intelligentization for tackling a real challenge-to learn damaged objects in aerial ***-learning system was integrated with the fuzzy broad learning system to further develop the theory of federated *** the mixed picture set of aerial video segmentation and the 3D-reconstructed mixed-reality data were employed in the performance of the broad federated meta-learning *** study results indicated that the object classification accuracy is up to 90%and the average time cost in damage detection is only 0.277 ***,the broad federated meta-learning system is efficient and effective in detecting damaged objects in aerial videos.

关键词： Fuzzy learning system mixed-reality 3D-reconstructed oblique photography

Evaluation of different crosslinking methods in altering the properties of extrusion-printed chitosan-basedmulti-material hydrogel composites

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Bio-Design and Manufacturing 2023年第2期6卷 150-173页

作者： Suihong Liu Haiguang Zhang Tilman Ahlfeld David Kilian Yakui Liu Michael Gelinsky Qingxi Hu Centre for Translational Bone Joint and Soft Tissue ResearchFaculty of Medicine and University Hospital Carl Gustav CarusTechnische Universität Dresden01307 DresdenGermany Rapid Manufacturing Engineering center School of Mechatronic Engineering and AutomationShanghai UniversityShanghai 200444China Shanghai Key Laboratory of intelligent Manufacturing and robotics School of Mechatronic Engineering and AutomationShanghai UniversityShanghai 200444China National Demonstration center for Experimental Engineering Training Education Shanghai UniversityShanghai 200444China

Three-dimensional printing technologies exhibit tremendous potential in the advancing fields of tissue engineering and regenerative medicine due to the precise spatial control over depositing the *** their widespread utilization and numerous advantages,the development of suitable novel biomaterials for extrusion-based 3D printing of scaffolds that support cell attachment,proliferation,and vascularization remains a ***-material composite hydrogels present incredible potential in this ***,in this work,a multi-material composite hydrogel with a promising formulation of chitosan/gelatin functionalized with egg white was developed,which provides good printability and shape *** addition,a series of comparative analyses of different crosslinking agents and processes based on tripolyphosphate(TPP),genipin(GP),and glutaraldehyde(GTA)were investigated and compared to select the ideal crosslinking strategy to enhance the physicochemical and biological properties of the fabricated *** of the results indicate that the composite hydrogel and the resulting scaffolds utilizing TPP crosslinking have great potential in tissue engineering,especially for supporting neo-vessel growth into the scaffold and promoting angiogenesis within engineered tissues.

关键词： Multi-material composite hydrogel Crosslinking mechanism Chitosan Gelatin Egg white 3D printing

A Rhythmic Motion Control Method Inspired by Board Shoe Racing for a Weight-Bearing Exoskeleton

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Journal of Bionic Engineering 2022年第2期19卷 403-415页

作者： Tianshuo Wang Jie Zhao Dongbao Sui Sikai Zhao Yanhe Zhu State Key Laboratory of robotics and System Harbin Institute of TechnologyHarbin 150001China

To ensure the flexible walking of the weight-bearing exoskeleton robot,most researchers control the exoskeleton to follow the wearer’s movements and provide force to maintain the current dynamic ***,due to the limitation of sensing information and computing power,it is difficult for the exoskeleton to provide the wearer reasonable and stable force only based on the dynamic model,especially in switching between swing phase and stance *** by China’s traditional sport named board shoe racing,a walking control method based on the cooperation of the human and the exoskeleton is proposed in this paper for a lower-limb exoskeleton named *** certain conditions,the exoskeleton itself can walk stably depending on the rhythm signals generated by the Central Pattern Generator(CPG).With certain initiative during walking,it can make proper adjustments according to the human *** the help of dynamic simulation software and Genetic Algorithm(GA),the optimized CPG parameters are *** control is introduced to increase the comfort of the *** impedance parameters as well as the CPG parameters are tuned in real time based on *** experiments were conducted with *** results demonstrate that PALExo can effectively assist the wearer walking with a 45-kg payload benefiting from the proposed method.

关键词： Exoskeleton robot Central pattern generator Walking control method

A Systematic Approach for Exploring Underground Environment Using LiDAR-Based System

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Computer Modeling in Engineering & Sciences 2023年第9期136卷 2321-2344页

作者： Tareq Alhmiedat Ashraf M.Marei Saleh Albelwi Anas Bushnag Wassim Messoudi Abdelrahman Osman Elfaki Industrial Innovation&robotics center University of TabukTabuk71491Saudi Arabia Faculty of Computers&Information Technology University of TabukTabuk71491Saudi Arabia

Agricultural projects in different parts of the world depend on underground water ***,there have been many unfortunate incidents inwhich children have died in abandoned *** topographical information for these wells is a prerequisite to protecting people from the dangers of falling into them,especially since most of these wells become buried over *** solutions have been developed recently,most with the aimof exploring these well ***,these systems suffer fromseveral limitations,including high complexity,large size,or *** paper focuses on the development of a smart exploration unit that is able to investigate underground well areas,build a 3D map,search for persons and animals,and determine the levels of oxygen and other *** exploration unit has been implemented and validated through several experiments using various experiment *** results proved the efficiency of the developed exploration unit,in terms of 3D modeling,searching,communication,and measuring the level of *** average accuracy of the 3D modeling function is approximately 95.5%.A benchmark has been presented for comparing our results with related works,and the comparison has proven the contributions and novelty of the proposed system’s results.

关键词： Well exploration lidar scanning 3Dmodelling rescue

2.5-dimensional angle potential field algorithm for the real-time autonomous navigation of outdoor mobile robots

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Science China(Information Sciences) 2011年第10期54卷 2100-2112页

作者： QIU Quan 1,3 & HAN JianDa 2 1 Beijing Research center of intelligent Equipment for Agriculture,Beijing 100097,China 2 State Key Laboratory of robotics,Shenyang Institute of Automation,Chinese Academy of Sciences,Shenyang 110016,China 3 National Research center for intelligent Agricultural Equipment,Beijing 100097,China Beijing Research center of intelligent Equipment for Agriculture Beijing China National Research center for intelligent Agricultural Equipment Beijing China State Key Laboratory of robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China

A new real-time algorithm for the autonomous navigation of mobile robots equipped with laser scanners is proposed in this *** from the existing algorithms designed for 2-dimensional navigation problems,the new algorithm introduces the height information of the obstacles into the guidance process and behaves as a 2.5-dimensional angle potential field algorithm (2.5D-APF) to fulfill the navigation requirements under complex outdoor terrain ***,one laser scan is partitioned into two kinds of function sectors: guidance sector and inspecting ***,the guidance sector and the inspecting sectors are reconstructed to form a virtual guidance scan,where the 2.5D information is taken into ***,the conventional APF is improved to analyze the virtual guidance scan and generate the navigation *** new algorithm is tested on a tracked mobile robot,and the experimental results validate the proposed algorithm.

关键词： robot 2.5-dimensional outdoor real-time autonomous navigation

Automatic Team Assignment and Jersey Number Recognition in Football Videos

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intelligent Automation & Soft Computing 2023年第6期36卷 2669-2684页

作者： Ragd Alhejaily Rahaf Alhejaily Mai Almdahrsh Shareefah Alessa Saleh Albelwi Faculty of Computing and Information Technology University of TabukTabuk47321Saudi Arabia Industrial Innovation&robotics center(IIRC) University of TabukSaudi Arabia

Football is one of the most-watched sports,but analyzing players’per-formance is currently difficult and labor *** analysis is done manually,which means that someone must watch video recordings and then log each player’s *** includes the number of passes and shots taken by each player,the location of the action,and whether or not the play had a successful *** to the time-consuming nature of manual analyses,interest in automatic analysis tools is high despite the many interdependent phases involved,such as pitch segmentation,player and ball detection,assigning players to their teams,identifying individual players,activity recognition,*** paper proposes a system for developing an automatic video analysis tool for *** proposed system is the first to integrate multiple phases,such as segmenting the field,detecting the players and the ball,assigning players to their teams,and iden-tifying players’jersey *** team assignment,this research employed unsu-pervised learning based on convolutional autoencoders(CAEs)to learn discriminative latent representations and minimize the latent embedding distance between the players on the same team while simultaneously maximizing the dis-tance between those on opposing *** paper also created a highly accurate approach for the real-time detection of the ***,it also addressed the lack of jersey number datasets by creating a new dataset with more than 6,500 images for numbers ranging from 0 to *** achieving a high perfor-mance in deep learning requires a large training set,and the collected dataset was not enough,this research utilized transfer learning(TL)to first pretrain the jersey number detection model on another large dataset and then fine-tune it on the target dataset to increase the *** test the proposed system,this paper presents a comprehensive evaluation of its individual stages as well as of the sys-tem as a whole.

关键词： Football video analysis player detection ball detection team assignment jersey number recognition

Bioinspired Stretchable MXene Deformation-Insensitive Hydrogel Temperature Sensors for Plant and Skin Electronics

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Research 2024年第1期2023卷 389-401页

作者： Jun Wu Yinghui Li Shengshun Duan Zhehan Wang Xu Jing Yucheng Lin Di Zhu Wei Lei Qiongfeng Shi Li Tao Joint International Research Laboratory of Information Display and Visualization School of Electronic Science and EngineeringSoutheast UniversityNanjingJiangsu 210096China School of Materials Science and Engineering Southeast UniversityNanjingJiangsu 210096China center of 2D Materials and Devices Southeast UniversityNanjingJiangsu 210096China

Temperature sensing is of high value in the wearable healthcare,robotics/prosthesis,and noncontact physiological ***,the common mechanic deformation,including pressing,bending,and stretching,usually causes undesirable feature size changes to the inner conductive network distribution of temperature sensors,which seriously influences the ***,inspired by the transient receptor potential mechanism of biological thermoreceptors that could work precisely under various skin contortions,we propose an MXene/Clay/poly(N-isopropylacrylamide)(PNIPAM)(MCP)hydrogel with high stretchability,spike response,and deformation *** dynamic spike response is triggered by the inner conductive network transformation from the 3-dimensional structure to the 2-dimensional surface after water being discharged at the threshold *** water discharge is solely determined by the thermosensitivity of PNIPAM,which is free from mechanical deformation,so the MCP hydrogels can perform precise threshold temperature(32℃)sensing under various deformation conditions,i.e.,pressing and 15%*** a proof of concept,we demonstrated the applications in plant electronics for the real-time surface temperature monitoring and skin electronics for communicating between human and *** research opens venues for the accurate temperature-threshold sensation on the complicated surface and mechanical conditions.

关键词： stretching proof precise

Ultra-flexible graphene/nylon/PDMS coaxial fiber-shaped multifunctional sensor

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Nano Research 2023年第4期16卷 5541-5547页

作者： Peddathimula Puneetha Siva Pratap Reddy Mallem Sung Cheol Park Seoha Kim Dong Hun Heo Cheol Min Kim Jaesool Shim Sung Jin An Dong-Yeon Lee Kwi-Il Park Department of robotics and intelligent Machine Engineering/College of Mechanical and IT Engineering Yeungnam UniversityGyeongsan 38541Republic of Korea School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Advanced Material Research center Kumoh National Institute of TechnologyGumi 39177Republic of Korea School of Mechanical Engineering Yeungnam UniversityGyeongsan 38541Republic of Korea Department of Materials Science and Engineering Kumoh National Institute of TechnologyGumi 39177Republic of Korea

The development of flexible and wearable devices is mainly required for tactile sensing;as such devices can adapt to complicated nonuniform surfaces,they can be applied to the human ***,it remains necessary to simultaneously achieve small-scale,portable,and stable developments in such ***,this work aims at fabricating a novel,lightweight,ultra-flexible,and fiber-shaped coaxial structure with a diameter of 0.51 mm using polydimethylsiloxane/graphene/nylon material,based on piezoresistive and triboelectric *** piezoresistive-based robotic-hand-controlled sensor thus realized exhibits a response time of 120 ms and a fast recovery time of 55 ***,the piezoresistive-based sensors effectively feature whisker/joystick-guided behaviors and also sense the human finger *** to the triboelectric-based selfpowered nanogenerator behavior,the resulting sensor can convert mechanical motion into electrical energy,without adversely affecting human ***,this triboelectric-based human finger sensor can be operated under different bending modes at specific ***,this multifunctional sensor is cost-effective and suitable for various applications,including robotichand-controlled operations in medical surgery,whisker/joystick motions in lightweight drone technology,and navigation with highsensitivity components.

关键词： extremely lightweight ultra-flexible piezoresistive/triboelectric sensor human-machine whisker