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38th International Cosmic Ray Conference, ICRC 2023

作者： Hashizume, Masaki Suda, Yusuke Fukazawa, Yasushi Tsuru, Takeshi Go Takeda, Ayaki Physics Program Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi-Hiroshima Hiroshima Japan Kyoto University Graduate School of Science Yoshida-Honmachi Sakyo-ku Kyoto Japan University of Miyazaki Department of Technology 1-1 Gakuen Kibanadai-nishi Miyazaki Japan

Cosmic MeV gamma-ray observations are important for elucidating physics in high-energy objects such as gamma-ray bursts and active galactic nuclear jet blazars, for detecting nuclear gamma-rays in supernova explosions, and for advancing multi-messenger astronomy. However, there has been no progress since the COMPTEL detector on board the CGRO satellites in the 1990s, and a satellite for MeV gamma-ray observations is essential. Compton scattering is the dominant interaction between MeV gamma-rays and matter. The minimal way to reconstruct the arrival direction of an incident gamma-ray is to utilize both the deposit energy and hit position measured in both the scatterer and absorber, giving an event circle. The circle can be reduced to an arc if the initial direction of the Compton scattered electron is measured. Thus such an electron-tracking Compton camera is expected to improve the source sensitivity by reducing background events. Therefore, our goal is to enable more accurate Compton imaging by using an event-driven SOI pixel detector "XRPIX" as a scatterer in an electron-track Compton camera. The pixel size of XRPIX is as small as 36 um square, so it is expected to capture electron trajectories for scattering of gamma-rays of several hundred keV. In this contribution, we report on the evaluation of the depletion layer thickness of XRPIX8.5, which can be fully depleted at room temperature, the sensor response when irradiated with gamma-rays such as 662 keV of Cs-137 and 511 keV of Na-22, and a method for estimating the direction of scattered electrons. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmology

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Photothermal and pH dual-responsive self-healing coating for smart corrosion protection

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Journal of Materials science & technology 2022年第12期107卷 34-42页

作者： Yao Huang Panjun Wang Weimin Tan Wenkui Hao Lingwei Ma Jinke Wang Tong Liu Fan Zhang Chenhao Ren Wei Liu Dawei Zhang Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Materials Corrosion and Protection Data Center University of Science and Technology BeijingBeijing 100083China National Engineering Research Center for Coatings CNOOC Changzhou Paint and Coatings Industry Research InstituteChangzhou 213016China State Key Laboratory of Advanced Power Transmission Technology(Global Energy Interconnection Research Institute Co.Ltd. )Beijing 100083China BRI Southeast Asia Network for Corrosion and Protection(MOE) Shunde Graduate School of University of Science and Technology BeijingFoshan 528300China

A novel self-healing coating with photothermal and pH dual-responsive properties has been designed to protect carbon steel against corrosion by loading the stimuli-responsive microcapsules into a shape memory epoxy coating. The sandwich-like microcapsules were based on reduced graphene oxide/mesoporous silica(r GO@MS) assembled with a p H-responsive poly(N,N-dimethylaminoethyl methacrylate)(PDMAEMA) layer, and were loaded with benzotriazole(BTA) inhibitors(abbreviated as rGO@MS-P-BTA). Under near-infrared(NIR) light irradiation, the prominent photothermal effect of rGO could not only elevate the coating temperature to activate the shape memory effect and close the coating scratch, but also facilitate the release of corrosion inhibitors to suppress the corrosion activity. Moreover,the PDMAEMA as a p H-driven “gatekeeper” realized the controlled release of BTA from microcapsules at acid conditions. The surface morphology analysis, electrochemical impedance spectroscopy(EIS), and scanning electrochemical microscopy(SECM) were performed to evaluate the self-healing performance of the composite coatings. The results showed that the combination of NIR light and p H-responsive selfhealing effects endowed the coating with short healing time and prominent healing efficiency.

关键词： Self-healing coatings Corrosion inhibitors Photothermal effects pH-responsive Shape memory polymers

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Generation of Steady Wheel Gait for Planar X-shaped Walker with Reaction Wheel

Generation of Steady Wheel Gait for Planar X-shaped Walker w...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Fumihiko Asano Taiki Sedoguchi Cong Yan Graduate School of Advanced Science and Technology Japan Advanced Institute of Science and Technology Nomi Ishikawa Japan Department of Mechanical Engineering Ritsumeikan University Kusatsu Shiga Japan

ISBN: (数字)9798350384574

ISBN: (纸本)9798350384581

This paper addresses the problem of realizing a novel robotic bipedal locomotion called wheel gait, which is achieved by rotating the stance and swing legs in the same direction. First, a model of a planar 3-DOF X-shaped walker with a reaction wheel is introduced, and the mathematical equations are described. Second, the condition for stabilizing zero dynamics is formulated as the time integral value of control input to the reaction wheel for one step becomes zero, and the control system for achieving this is designed based on the method of continuous-time output deadbeat control. Third, a typical steady wheel gait of the linearized model is numerically generated, and its extension to the nonlinear model is discussed. Although the nonlinear model has only one nonlinear term in the gravity term, numerical simulations show that there is a big gap between this and the linearized model. Through analysis of the typical nonlinear wheel gaits, the difficulty of achieving the same walking speed as the linearized model is discussed.

关键词： Legged locomotion Analytical models 3-DOF Wheels Numerical simulation Control systems Mathematical models

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Collective Behavior Regulation in Drone Swarms via Pinning Strategies 7th

Collective Behavior Regulation in Drone Swarms via Pinning...

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7th Chinese Conference on Swarm Intelligence and Cooperative Control, CCSICC 2023

作者： Liu, Gaoxiang Liu, Kexin Chen, Lei School of Automation Science and Electrical Engineering Beihang University Beijing100191 China The State Key Laboratory of Software Development Environment Beihang University Beijing100191 China Advanced Research Institute of Multidisciplinary Sciences Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9789819733354

In this paper, we discuss the collective behavior of drone swarms and remark that the swarm behavior can be realized by pinning a few nodes. Additionally, the selection of pinning nodes effects the global characteristic. Compared with other methods, the uniform degree selection of pinning nodes in a swarm exhibits better performance. In order to verify the effectiveness of our pinning strategy, we conduct simulations in a self-driven drone swarm, in which the experimental results confirm the availability of our conclusion. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Drones

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advanced flexible humidity sensors:structures,techniques,mechanisms and performances

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Frontiers of Materials science 2023年第4期17卷 37-53页

作者： Yuzhe Zhang Yuxi Liu Lifei Lin Man Zhou Wang Zhang Liwei Lin Zhongyu Li Yuanzhe Piao Sun Ha Paek School of Environmental Science and Engineering Changzhou UniversityChangzhou 213164China Department of Applied Bioengineering Graduate School of Convergence Science and TechnologySeoul National UniversitySeoul 08826Republic of Korea Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China Department of Neurosurgery Movement Disorder CenterSeoul National University HospitalSeoul 03080Republic of Korea Advanced Institutes of Convergence Technology Suwon-siGyeonggi-do 16229Republic of Korea

Flexible humidity sensors are widely used in many fields,such as environmental monitoring,agricultural soil moisture content determination,food quality monitoring and healthcare ***,it is essential to measure humidity accurately and reliably in different *** materials have been the focusing substrates of humidity sensors because of their rich surface chemical properties and structural *** addition,flexible materials have superior ductility for different *** this review,we have summarized several sensing mechanisms,processing techniques,sensing layers and substrates for specific humidity sensing ***,we have sorted out some cases of flexible humidity sensors based on different functional *** hope this paper can contribute to the development of flexible humidity sensors in the future.

关键词： flexible composite manufacturing technology sensing mechanism humidity sensor

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A Study of Multi-objective Transient Stability Constrained Optimal Power Flow based on Reduced-Space Interior Point Method -Consideration of Multiple Contingencies Models

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IEEJ Transactions on Power and Energy 2024年第5期144卷 330-336页

作者： Kurokawa, Daiki Kubokawa, Junji Yorino, Naoto Zoka, Yoshifumi Sasaki, Yutaka Graduate School of Advanced Science and Engineering Hiroshima University 1-4-1 Kagamiyama Higashi Hiroshima739-8527 Japan Hiroshima Institute of Technology 2-1-1 Miyake Saeki-ku Hiroshima731-5143 Japan Kure College 2-2-11 Aga Minami Kure737-8506 Japan

It is hoped that the power system will be operated safely and economically. Optimal Power Flow (OPF) is being studied in order to find a more economical operational point while ensuring safety. In our laboratory, we have been studying TSCOPF (Transient Stability Constrained Optimal Power Flow) after the assumed contingency by adding the magnitude of the phase angle with respect to the center of inertia to the constraint condition. Currently, the combination of the interior point method and the numerical discretization method is widely used to solve TSCOPF. Since the TSCOPF with numerical discretization is a large nonlinear programming problem, and there is a problem that the calculation time becomes long. In our previous research, we have reduced the computation time for a single contingency TSCOPF using the Reduced Space Technique. In this study, we propose the multi-objective TSCOPF with multiple contingencies using Reduced Space Technique to reduce the computational burden. The proposed method has been implemented and applied to the IEEJ WEST 30 test system to demonstrate the effectiveness of the proposed method. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Multiobjective optimization

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When quantum dots meet blue phase liquid crystal elastomers:visualized full-color and mechanically-switchable circularly polarized luminescence

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Light(science & Applications) 2024年第6期13卷 1210-1220页

作者： Shan Li Yuqi Tang Qingyan Fan Ziyuan Li Xinfang Zhang Jingxia Wang Jinbao Guo Quan Li Key Laboratory of Carbon Fibers and Functional Polymers Ministry of Educationand College of Materials Science and EngineeringBeijing University of Chemical Technology100029BeijingChina Institute of Advanced Materials and School of Chemistry and Chemical Engineering Southeast UniversityNanjing211189China Materials Science Graduate Program Kent State UniversityKentOH44242USA CAS Key Laboratory of Bio-Inspired Materials and Interfacial Sciences Technical Institute of Physics and ChemistryChinese Academy of Sciences100190BeijingChina

Polymer-based circularly polarized luminescence(CPL)materials with the advantage of diversified structure,easy fabrication,high thermal stability,and tunable properties have garnered considerable ***,adequate and precise tuning over CPL in polymer-based materials remains challenging due to the difficulty in regulating chiral ***,visualized full-color CPL is achieved by doping red,green,and blue quantum dots(QDs)into reconfigurable blue phase liquid crystal elastomers(BPLCEs).In contrast to the CPL signal observed in cholesteric liquid crystal elastomers(CLCEs),the chiral 3D cubic superstructure of BPLCEs induces an opposite CPL ***,this effect is entirely independent of photonic bandgaps(PBGs)and results in a high glum value,even without matching between PBGs and the emission bands of ***,the lattice structure of the BPLCEs can be reversibly switched via mechanical stretching force,inducing on-off switching of the CPL signals,and these variations can be further fixed using dynamic disulfide bonds in the ***,the smart polymer-based CPL systems using the BPLCEs for anti-counterfeiting and information encryption have been demonstrated,suggesting the great potential of the BPLCEs-based CPL active materials.

关键词： circular quantum crystal

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Optimal Pinning Strategy of Drone Swarms

Optimal Pinning Strategy of Drone Swarms

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2022 IEEE International Conference on Unmanned Systems, ICUS 2022

作者： Zhou, Jinhao Chen, Lei Liu, Kexin Zheng, Dezhi Liu, Gaoxiang School of Automation Science and Electrical Engineering Beihang Uniersity Beijing China Advanced Research Institute of Multidisciplinary Sciences Beijing Institute of Technology Beijing China

ISBN: (数字)9781665484565

ISBN: (纸本)9781665484565

Regulating a large-scale drone swarm from an external command is investigated in this paper. A pinning framework of large-scale drone swarm is proposed. Based on the synchronized region of a drone swarm, an analytical approach is carried out to select driver drones via using eigenratio of Laplacian matrix as an index. Theoretic and simulation results are presented to show the effectiveness of our methods. © 2022 IEEE.

关键词： Drones

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Aromatic compounds-mediated synthesis of anatase-free hierarchical TS-1 zeolite:Exploring design strategies via machine learning and enhanced catalytic performance

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Aggregate 2023年第4期4卷 138-151页

作者： Chang’an Wang Guoqing An Jing Lin Xiaowei Zhang Zhiyuan Liu Yibin Luo Siqi Liu Zhixiang Cheng Tingting Guo Hongyi Gao Ge Wang Xingtian Shu Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory of Function Materials for Molecule and Structure ConstructionSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingP.R.China Institute of Advanced Materials Beijing Normal UniversityBeijingP.R.China Research Institute of Petroleum Processing SINOPECBeijingP.R.China SINOPEC Changling Branch Company YueyangP.R.China Shunde Graduate School University of Science and Technology BeijingShundeP.R.China

Simultaneous achievement of constructing mesopores and eliminating anatase is a long-term pursuit for enhancing the catalytic performance of ***,we developed an aromatic compounds-mediated synthesis method to prepare anatase-free and hierarchical TS-1 for olefin epoxidation.A series of hierarchical TS-1 zeolites were prepared by introducing aromatic compounds containing different functional groups via the crystallization *** formation of intercrystalline mesopores and insertion of titanium into framework were facilitated at different *** synergistic coordination of carboxyl and hydroxyl in aromatic compounds with Ti(OH)4 realizes the uniform distribution of titanium species and eliminates the generation of ***,eight machine learning models were trained to reveal the mechanism of additive functional groups and preparation conditions on anatase formation and microstructure *** prediction accuracy of most models can reach more than 80%.Benefiting from the larger mesopore volumes(0.37 cm3⋅g−1)and higher content of framework Ti species,TS-DHBDC-48h samples exhibit a higher catalytic performance than other zeolites,giving 1-hexene conversion of 49.3%and 1,2-epoxyhenane selectivity of 99.9%.The paper provides a facile aromatic compounds-mediated synthesis strategy and promotes the application of machine learning toward the design and optimization of new zeolites.

关键词： 1-hexene epoxidation aromatic compounds machine learning selectivity TS-1 zeolites

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Stable Wheel Gait Generation for Planar X-shaped Walker with Telescopic Legs Based on Asymmetric Impact Posture

Stable Wheel Gait Generation for Planar X-shaped Walker with...

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IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)

作者： Fumihiko Asano Mikito Komori Taiki Sedoguchi Yanqiu Zheng Graduate School of Advanced Science and Technology Japan Advanced Institute of Science and Technology Nomi Ishikawa Japan Department of Mechanical Engineering Ritsumeikan University Kusatsu Shiga Japan

ISBN: (数字)9798350377705

ISBN: (纸本)9798350377712

This paper introduces a novel X-shaped walker with telescopic legs and investigates its control method with the aim of generating a stable wheel gait on a horizontal plane without including zero dynamics which is essentially unstable and difficult to stabilize. First, we outline a planar 6-DOF robot model with three control inputs, and describe the equations of motion and inelastic collision. Second, we design an output-following control system that smoothly controls the extension/contraction lengths of the legs and relative hip-joint angle to their target terminal values, and creates an asymmetric impact posture in the anteroposterior direction so that the robot can easily overcome the next potential barrier. The coefficients of the desired-time trajectory for each control output are updated with the position and velocity values immediately after each impact as the target initial values, so the generated leg motion and control inputs exhibit smooth time variation. The validity of the proposed gait generation method and the change trend of fundamental motion characteristics with respect to control parameters are investigated through numerical simulations.

关键词： Legged locomotion Dynamics Wheels Control systems Numerical simulation Market research Mathematical models Trajectory Collision avoidance Intelligent robots

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