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IEEE International Conference on robotics and Biomimetics

作者： Haisu Liao Zhongliang Ren Yidi Wang Xinyu Wu Fei Gao Southern University of Science and Technology Shenzhen China Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen China Guangdong-Hong Kong-Macao Joint Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen China

ISBN: (数字)9798331509644

ISBN: (纸本)9798331509651

Harvesting energy from the human body to extend the operational time for low-power has gained significant attention. Recently, researchers have focused on biomechanical energy harvesting from human feet while walking. This paper presents an optimization of the cam profile for a piezoelectric-based sole energy harvester designed to be worn on the bottom of shoes to power electronic devices. Specifically, cams with linear polynomial and exponential functions were designed to actuate the piezoelectric transducers (PZTs). Force analysis revealed that the exponential function cam induces more significant deformation in the PZTs than the linear polynomial cam. Preliminary tests on a healthy subject validated this design, showing that the exponential function cam produced an average output power of 0.16mW at a walking speed of 5.5 km/h, indicating a 78% improvement over the linear polynomial cam. Moreover, the optimization rate increased with the growing walking speed.

关键词： Legged locomotion Deformation Force Voltage Polynomials Energy harvesting Power generation Optimization Lead zirconate titanate Testing

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Three-Dimensional Force Sensor Based on Deep Learning 1st

Three-Dimensional Force Sensor Based on Deep Learning

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1st International Conference on Cognitive Computation and Systems, ICCCS 2022

作者： Duan, Qingling Zhang, Qi Luo, Dong Yang, Ruofan Zhu, Chi Liu, Zhiyuan Ou, Yongsheng Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Guangdong Shenzhen518055 China Key Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen China Shenzhen College of Advanced Technology University of Chinese Academy of Sciences Shenzhen China Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen China Shenzhen China

ISBN: (纸本)9789819927883

Human skin can accurately sense subtle changes of both normal and shear forces. However, tactile sensors applied to robots are challenging in decoupling 3D forces due to the inability to develop adaptive models for complex soft materials. Therefore, a new soft tactile sensor has been designed in this paper to detect shear and normal forces, including a soft probe and image acquisition device. First, to capture the deformation of the sensor, colored silicone squares were embedded in the soft probe. Capcamera movement of the colored squares under external forces. The image dataset collected at different 3D forces is then input into a deep learning model. Finally, a custom miniature image device is acquired and embedded in the soft probe to miniaturize the sensor. Computing results obtained from experimental datasets show that the proposed method can accurately decouple the 3D forces. Robots can grap vulnerable objects with sensors prepared at the robot’s tip. The tactile sensors studied in this paper are expected to be applied in robotics fields such as adaptive grasping, dexterous manipulation and human-computer interaction. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Probes

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Phase transformation of two-dimensional nanomaterials: state-of-the-art progress in designing strategies and catalytic applications

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Science China Materials 2025年第1期68卷 65-85页

作者： Zeqi Wu Feng Niu Da Chen Yuexiang Huang Guigao Liu Yong Zhou Wenguang Tu Xi Zhu Zhigang Zou College of Materials and Chemistry China Jiliang UniversityHangzhou 310018China School of Science and Engineering The Chinese University of Hong Kong(Shenzhen)Shenzhen 518172China National Special Superfine Powder Engineering Research Center School of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094China Jiangsu Key Laboratory for Nano Technology National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresSchool of PhysicsNanjing UniversityNanjing 210093China

Phase transformation of two-dimensional(2D)nanomaterials can lead to significant changes in electronic and optical properties,which enables the development of novel *** strategies for phase engineering of 2D nanomaterials have drawn considerable attention in recent *** review focuses on the state-of-the-art progress in the phase transformation of 2D nanomaterials and their catalytic ***,the basic concepts of phase transformation and the outstanding electronic and optical properties induced by phase transformation are briefly ***,different strategies for achieving phase transformation are discussed in detail and classified into several types based on their characteristics,including(i)doping,(ii)external fields,(iii)optical irradiation,(iv)strain effect,(v)high-energy particle excitation,and(vi)thermal *** applications of 2D nanomaterials in catalysis based on phase transformation have also been ***,a summary of the technical challenges to phase control in 2D nanomaterials and potential opportunities for developing novel applications is presented.

关键词： phase transformation two-dimensional nanomaterials strategy catalysis application

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Determining and structuring ultrafast laser pulses: from direct optical tailoring to optomechanical coupling through engineering microfibers

Determining and structuring ultrafast laser pulses: from dir...

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Laser Science, LS 2021 - Part of Frontiers in Optics, FiO 2021

作者： Zhao, Junqing Zhou, Jian Chen, Zikai Jiang, Yuyuan Liu, Jing Jiangsu Key Laboratory of Advanced Laser Materials and Devices Jiangsu Collaborative Innovation Center of Advanced Laser Technology and Emerging Industry School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou221116 China CW Chu College Jiangsu Normal University Jiangsu Xuzhou221116 China

We demonstrate that ultrafast laser pulses can be efficiently determined and structured either by direct optical tailoring or optomechanical coupling in fiber lasers through engineering microfibers. © Optica Publ... 详细信息

ISBN: (纸本)9781557528209

关键词： Fiber lasers

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Quantum walks of correlated photons in non-Hermitian photonic lattices

arXiv

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arXiv 2024年

作者： Gao, Mingyuan Sheng, Chong Zhao, Yule He, Runqiu Lu, Liangliang Chen, Wei Ding, Kun Zhu, Shining Liu, Hui National Laboratory of Solid State Microstructures School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Jiangsu Nanjing210093 China Key Laboratory of Optoelectronic Technology of Jiangsu Province School of Physical Science and Technology Nanjing Normal University Nanjing210023 China Fudan University Shanghai200438 China Ministry of Education Jiangsu Nanjing211189 China

Entanglement entropy characterizes the correlation of multi-particles and unveils the crucial features of open quantum systems. However, the experimental realization of exploring entanglement in non-Hermitian systems remains a challenge. In parallel, quantum walks have offered the possibility of studying the underlying mechanisms of non-Hermitian physics, which includes exceptional points, the non-Hermitian skin effect, and non-Bloch phase transitions. Unfortunately, these studies have only involved and prevailingly focused on the behavior of a single particle. Here, we propose and experimentally realize quantum walks of two indistinguishable photons in engineered non-Hermitian photonic lattices. We have successfully observed the unidirectional behavior of quantum walks in the bulk far from the edges induced by the skin effect. Moreover, we experimentally reveal the suppression of entanglement that is caused by the skin effect in non-Hermitian systems. Our study may facilitate a deep understanding of entanglement in open quantum many-body systems that are far from thermal equilibrium. © 2024, CC0.

关键词： Photons

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Fault-Tolerant Control of Hybrid UAV Using Weighted Control Allocation Scheme

Fault-Tolerant Control of Hybrid UAV Using Weighted Control ...

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American Control Conference (ACC)

作者： Salman Ijaz Umair Javaid Ahmed Nasr Donglei Sun Members of Control System Laboratory and Key Laboratory of More-Electric Aircraft Zhejiang Province and University of Nottingham Ningbo China School of Robotics Ningbo University of Technology Zhejiang China Advanced Intelligent Manufacturing Research Group University of Nottingham Ningbo China

ISBN: (数字)9798350382655

ISBN: (纸本)9798350382662

This study presents a methodology to enhance the operating safety of hybrid unmanned aerial vehicles by employing an active fault-tolerant control technique. The idea is to incorporate the weighted control allocation scheme with integral-sliding mode control law to attain accurate tracking performance while accounting for the impact of actuator faults and failures. One notable benefit of this methodology lies in its ability to attain tracking accuracy in all operational modes of hybrid UAVs through the careful creation of a suitable weighting matrix. The efficiency of the suggested system is demonstrated by numerical simulations conducted on a longitudinal model of an octoplane aircraft. The proposed controller demonstrates satisfactory performance both in nom-inal conditions and under faults occurring in the elevator and rotors 1, 2, 7, and 8 at 20s and 40s.

关键词： Smart agriculture Actuators Fault tolerance Accuracy Fault tolerant systems Spraying Autonomous aerial vehicles

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Controllable and Universal Anisotropic Vapor-Solid Growth of Vertical 2d Metal Chalcogenide Nanoflakes with Enhanced Photoelectric and Electrocatalytic Properties

SSRN

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SSRN 2023年

作者： Hu, Yi Liang, Junchuan Yang, Songyuan Jiang, Minghang Xia, Yuren Zhang, Wenjun Li, Fajun Tie, Zouxiu Jin, Zhong State Key Laboratory of Coordination Chemistry MOE Key Laboratory of Mesoscopic Chemistry MOE Key Laboratory of High Performance Polymer Materials and Technology Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical Engineering Nanjing University Jiangsu Nanjing210023 China School of Chemistry and Chemical Engineering Suzhou University Anhui Suzhou234000 China

Epitaxial growth and subsequent processing of 2D materials are mostly confined to xy plane parallel to the substrate. Introducing another degree of freedom, i.e., the vertical direction perpendicular to the base plane, is very intriguing, as the resulting vertically aligned 2D materials will intuitively have a high aspect ratio, anisotropic structure, and abundant edge sites, holding great promise in field emission, photoelectronics, piezoelectricity, clean energy catalysis, etc. However, the key factors governing the spatially anisotropic growth to selectively obtain vertically or horizontally aligned 2D nanoflakes remain elusive. Herein, we report a controllable and general strategy to vertically grow representative 2D metal chalcogenide materials, including but not limited to SnS, SnSe, Bi2Se3, MoO3, and MoS2 nanoflakes, via a rapid heating-cooling process on various optional substrates. The rapid heating-cooling process allows rapid desublimation and nucleation of highly-supersaturated precursor vapor, leading to ultrafast growth of vertically aligned nanoflakes with exposed side surfaces and edges. As an example, the vertically grown SnS nanoflakes exhibit anisotropic spectroscopic features, superior photoelectric properties and enhanced electrocatalytic performances for the nitrate reduction and CO2 reduction reactions. This work provides a feasible approach to controllably synthesize versatile vertically aligned 2D metal chalcogenide nanoflakes on various substrates, which can advance the mechanistic understanding of anisotropic growth and physicochemical properties of 2D materials towards photoelectric devices and clean energy conversion. © 2023, The Authors. All rights reserved.

关键词： Selenium compounds

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Numerical simulation of moisture dynamics in manufactured sand concrete: impact of diffusion and self-desiccation

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Materials and Structures 2025年第5期58卷 1-17页

作者： Xu, Weina Zhang, Yunsheng Zhang, Yu Wang, Qiliang School of Civil Engineering Lanzhou University of Technology Gansu Advanced Civil Engineering Materials Engineering Research Center Lanzhou China Jiangsu Key Laboratory of Construction Materials School of Materials Science and Engineering Southeast University Nanjing China College of Resources Shandong University of Science and Technology Taian China

The increasing demand–supply disparity of natural sand has induced the widespread adoption of manufactured sand in various projects. The particular stone powder in manufactured sand has a notable impact on the hydration process of cementitious materials, which causes variations in the internal moisture content of the manufactured sand concrete (MSC). One of the key components of many degradation processes, such as shrinkage and cracking, is the amount of water content in the MSC pores. Establishing a dynamic moisture distribution model for MSC with regard to hydration level is the aim of this work. The modeling method accounts for variations in humidity brought on by moisture diffusion as well as cement hydration. The dynamic humidity distribution of MSC during the separate impacts of self-desiccation and water diffusion was discussed along with parameters of the moisture model, i.e., hydration degree (α), hydration-induced humidity reduction value (Hs), and moisture transfer coefficient (D). Subsequently, the HETVAL (a user subroutine for defining heat generation and transfer) and USDFLD (a user-defined field variable subroutine for material property modification) were compiled on the ABAQUS secondary development platform to simulate the dynamic moisture distribution within MSC, based on the parameters of the moisture model. The fitting results of the model agreed well with the results from experiments. The proposed model can be subsequently utilized to analyze shrinkage-induced stress fields, as well as to control cracking in MSC structures.

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Conducting metallic metameshes with perfect electromagnetic transparency for arbitrary polarization and angle of incidence

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Physical Review Applied 2025年第2期23卷 024025-024025页

作者： Hao Luo Jie Luo HongChen Chu WenJie Ji Yun Lai National Laboratory of Solid State Microstructures School of Physics Collaborative Innovation Center of Advanced Microstructures and Jiangsu Physical Science Research Center Nanjing University Nanjing 210093 China School of Physical Science and Technology & Jiangsu Key Laboratory of Frontier Material Physics and Devices Soochow University Suzhou 215006 China School of Physics and Technology Nanjing Normal University Nanjing 210023 China School of Optical and Electronic Information Suzhou City University Suzhou 215104 China

Metallic meshes have long demonstrated outstanding electromagnetic shielding capabilities against low-frequency electromagnetic waves, facilitating vital applications like Faraday cages. Here, we demonstrate a metallic metamesh with tailored metallic patterns that is conducting like normal metallic meshes, but also exhibits remarkable perfect transparency for arbitrary electromagnetic waves at the working frequency. Based on special resonances introduced by the designed composite structures, such metameshes have achieved omnidirectional impedance matching with free space, regardless of the polarization and incident angle. This property enables near-100% transmission through the metamesh, with unchanged wave front. This transition from electromagnetic shielding to perfect transparency has been validated through both numerical simulations and microwave experiments. Our work paves the way towards realizing metastructures that are both conducting and transparent to electromagnetic waves, opening possibilities in radomes and wireless communications.

关键词： Wavefronts

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Estimating the Lateral Motion States of an Underwater Robot by Propeller Wake Sensing Using an Artificial Lateral Line

arXiv

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arXiv 2024年

作者： Wang, Jun Zhao, Dexin Zhao, Youxi Zhang, Feitian Shen, Tongsheng The Department of Advanced Manufacturing and Robotics College of Engineering Peking University Beijing China The National Innovation Institute of Defense Technology Beijing China The Department of Mechanics and Engineering Science College of Engineering Peking University Beijing China The Department of Advanced Manufacturing and Robotics The State Key Laboratory of Turbulence and Complex Systems College of Engineering Peking University Beijing China

The artificial lateral line (ALL), comprising distributed flow sensors, has been successful in sensing motion states of bioinspired underwater robots like robotic fish. However, its application to robots driven by rotating propellers remains unexplored due to the complexity of propeller wake flow. This paper investigates the feasibility of using ALL to sense propeller wake for underwater robot leader-follower formation. To estimate the lateral motion states of a leader propeller, this paper designs a multi-output deep learning network that extracts temporal and spatial features from distributed pressure measurements of propeller wake. Extensive experiments are conducted on a designed testbed, the results of which validate the effectiveness of the proposed propeller wake sensing method. Copyright © 2024, The Authors. All rights reserved.

关键词： Wakes

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