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Lunar regolith simulant-derived 3D-printed geopolymers with optimized mechanical and thermal management properties

Composites Part A: Applied Science and Manufacturing 2025年 196卷

作者： Sun, Yifan Ma, Siqi Chen, Qingze Chen, Guoliang He, Peigang Wang, Yaming Qiu, Jun Jia, Dechang School of Energy Science and Engineering Key Laboratory of Aerospace Thermophysics Harbin Institute of Technology Harbin150001 China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150001 China Institute for Advanced Ceramics Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology Harbin Institute of Technology Harbin150080 China Guangdong Provincial Key Laboratory of Mineral Physics and Materials Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510460 China

Lunar soil, as an in-situ resource, holds significant potential for constructing bases and habitats on the Moon. However, such constructions face challenges including limited mechanical strength and extreme temperature fluctuations ranging from −170 °C to +133 °C between lunar day and night. In this study, we developed a 3D-printed geopolymer derived from lunar regolith simulant with an optimized zig-zag structure, exhibiting exceptional mechanical performance and thermal stability. The designed structure achieved remarkable damage tolerance, with a compressive strength exceeding 12.6 MPa at ∼ 80 vol% porosity and a fracture strain of 3.8 %. Finite element method (FEM) simulations revealed that the triangular frame and wavy interlayers enhanced both stiffness and toughness. Additionally, by incorporating strategically placed holes and extending the thermal diffusion path, we significantly improved the thermal insulation of the structure, achieving an ultralow thermal conductivity of 0.24 W/(m K). Furthermore, an iron-free geopolymer coating reduced overheating under sunlight by 51.5 °C, underscoring the material's potential for space applications. © 2025 Elsevier Ltd

关键词： Compressive strength

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Two-Stage Hand-Eye Calibration based on Variance Minimization Principle

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IEEE Transactions on Instrumentation and Measurement 2025年 74卷

作者： Ding, Tao Tian, Dazhuang Wu, Hao Zhu, Dahu Li, Wenlog Wuhan University of Technology Hubei Key Laboratory of Advanced Technology for Automotive Components School of Automotive Engineering Wuhan430070 China Wuhan University of Technology Hubei Digital Manufacturing Key Laboratory School of Mechanical and Electronic Engineering Wuhan430070 China Wuhan University of Technology Hubei Key Laboratory of Advanced Technology for Automotive Components Hubei Provincial Engineering Research Center of Robot and Intelligent Manufacturing Wuhan430070 China Huazhong University of Science and Technology State Key Laboratory of Intelligent Manufacturing Equipment and Technology Wuhan430074 China

Hand-eye calibration in industrial scenarios greatly determines the efficiency and effectiveness of 3D vision-guided robotic tasks. Most of the existing hand-eye calibration methods, however, rely on collecting large-scale point cloud samples to guarantee high measurement accuracy, which is time-consuming and particularly influenced by measurement defects such as local missing, noise, and uneven density. To overcome this challenging problem, we present a novel two-stage hand-eye calibration method based on the variance minimization principle. In the first stage, a robust function weighted variance minimization (RFWVM) registration algorithm is proposed for fine registration of defective point clouds, aiming at solving the coarse hand-eye calibration matrix with few-shot point clouds. In the second stage, an objective function of the calibration error correction algorithm is established via the point-to-plane distance variance minimization, which is intended to suppress the influence of measurement defects. Through these two stages, the globally optimal hand-eye matrix is solved by iteratively correcting the coarse hand-eye calibration matrix. A series of experiments validate the universality, accuracy, and robustness of the proposed method. © 1963-2012 IEEE.

关键词： Error correction

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SP-A : sparse prior guided cost construction and adaptive intra and inter scale cost aggregation for multi-view depth estimation

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Signal, Image and Video Processing 2025年第5期19卷 1-10页

作者： Du, Qianqian Yin, Hui Han, Ming State Key Laboratory of Advanced Rail Autonomous Operation Beijing Jiaotong University Beijing China Beijing Key Laboratory of Traffic Data Mining and Embodied Intelligence Beijing Jiaotong University Beijing China Frontiers Science Center for Smart High-speed Railway System Beijing Jiaotong University Beijing China Key Laboratory of Beijing for Railway Engineering Beijing Jiaotong University Beijing China

Learning-based multi-view depth estimation approaches have achieved remarkable success, primarily by accurately matching correspondences between the reference and source views to construct distinguishable cost volume. Existing methods using plane sweeping with ordered and preset sampling fail to make the initial cost volume discriminative. Additionally, insufficient cost aggregation exacerbates the challenges in achieving accurate depth estimation within low-texture regions and object boundaries. In this paper, we propose a novel multi-view depth estimation network, termed $$\text {SP-A}\text {I}^{2}$$ (sparse prior guided cost construction and adaptive intra and inter scale cost aggregation). Specifically, we propose a sparse prior guided strategy for dynamic and nonuniform sampling across a wide depth range to construct the cost volume, which introduces reasonable and fine-grained spatial partitioning to refine the depth with higher accuracy. Furthermore, to improve the depth quality under challenging regions, a novel adaptive intra and inter scale cost aggregation ( $$\text {A}\text {I}^{2}$$ -SA) module is proposed to enhance the power of feature representation. The proposed $${\hbox {SP-A}}\text {I}^{2}$$ is trained end-to-end and experimental results demonstrate that our method achieves state-of-the-art results on various benchmark datasets.

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A wave-powered ocean robot integrated with umbrella-shaped wave energy converter

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Energy 2025年 328卷

作者： Lu, Yunfei Wang, Bingbing Zhou, Boen Zhou, Songlin Chen, Weixing State Key Laboratory of Mechanical System and Vibration School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China Research Center of Marine Intelligent Equipment and Robot Institute of Marine Equipment Shanghai Jiao Tong University Shanghai China

Extracting energy from waves offers a promising solution for ocean robots to address energy limitations and extend operational time. However, the compact size of ocean robots and the random nature of waves impose significant design challenges for wave energy converters. In response to these problems, this paper proposes an ocean robot that adopts a dual-mode operation principle and integrates an umbrella-shaped wave energy converter (U-WEC). In U-WEC mode, the robot deploys four foldable wings to harvest wave energy, while in robot mode, it folds the wings for a compact structure. The robot in U-WEC mode is designed with central symmetry and a float with low natural frequency, ensuring the adaptability to waves with random directions and low frequency. The operation principle of the robot is detailed along with the structure design. Then, a hydrodynamic model is established to calculate the motion responses of the robot in U-WEC mode. In the wave tank experiment, the dual-mode operation principle is first validated and then the wave energy conversion performance is tested, achieving an average power output of 2.59 W. Based on the proposed model verified with experimental results, the robot demonstrates insensitivity to wave directions and the capability to harness low-frequency waves, confirming its feasibility and potential for practical applications. © 2025 Elsevier Ltd

关键词： Intelligent robots

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Analysis of Spiral Scanning Amplitude Modulation Methods for Two-photon Endomicroscopy 10

Analysis of Spiral Scanning Amplitude Modulation Methods for...

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10th Symposium on Novel Optoelectronic Detection Technology and Applications

作者： Cui, Haodong Wang, Conghao Liu, Huilan Zhang, Xiulei Hu, Yanhui Fu, Qiang Wu, Runlong Wang, Aimin Feng, Lishuang School of Instrumentation and Optoelectronic Engineering Beihang University Beijing100191 China Beijing100191 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Beijing Transcend Vivoscope Biotech Co. Ltd. Beijing100049 China Beijing Key Laboratory for Optoelectronics Measurement Technology Beijing Information Science and Technology University Beijing100192 China State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronics Peking University Beijing100871 China

ISBN: (数字)9781510688155

ISBN: (纸本)9781510688148

Two-photon endomicroscopy is a high-resolution label-free imaging technique for biological tissues. This paper analyzes sinusoidal and triangular amplitude modulation methods for spiral scanning two-photon endomicroscopy. In the theoretical modeling section, the mathematical model of PZT fiber scanner is established, and the distortion of fiber scanning trajectory caused by two amplitude modulated sine wave signals is simulated and evaluated. In the experimental verification section, a test platform is constructed to measure the scanning trajectory distortion driven by these amplitude modulated sine wave signals. Finaly, spiral scanning two-photon endomicroscopic imaging of in-vivo GFP mice brain tissues using sinusoidal amplitude modulated signals are demonstrated. © 2025 SPIE.

关键词： Amplitude modulation

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Resonant frequencies of a piezoelectric drum transducer

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第9期10卷 1313-1319页

作者： Jiang-bo YUAN Tao XIE Xiao-biao SHAN Wei-shan CHEN State Key Laboratory of Advanced Robot and System Harbin Institute of Technology Harbin 150001 China

This paper presents a piezoelectric-metal structure called a drum transducer. An equation for calculating the resonance frequency of the drum transducer is obtained based on thin plate elastic theory of piezoelectric and metal material combined with the Rayleigh-Ritz method. The finite element method (FEM) was used to predict the excitation frequency of the drum transducer. To verify the theoretical analysis, the input impedance characteristic of the drum transducer was measured using an experimental method. The results obtained from theoretical analysis were in very good agreement with those from the FEM and experimental results. The effect of geometrical changes to the thick-walled steel ring of the drum transducer at the first resonance frequency is also described. The calculated results were found to be in good agreement with the FEM results. The results indicate that the first resonance frequency of the drum decreases with the increasing inner diameter of the thick-walled steel ring.

关键词： Piezoelectric Drum transducer Resonance frequency

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Anti-saturation prescribed-time control for stochastic systems of free-flying space robots using a self-adapting non-monotonic approach

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Aerospace Science and Technology 2025年 162卷

作者： Xia, Yu He, Jun Li, Kaixin Gao, Feng Agarwal, Ramesh K. State Key Laboratory of Mechanical System and Vibration School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Mechanical Transmission for Advanced Equipment Chongqing University Chongqing400044 China Department of Mechanical Engineering Washington University in St. Louis Campus St. LouisMO63130 United States

This paper proposes an anti-saturation prescribed-time control scheme for free-flying space robots (FFSRs) subject to system uncertainties, external disturbances, input saturation, and output constraint. Initially, the control scheme is developed based on a newly constructed stochastic model, introducing stochastic neural networks (SNNs) to approximate the lumped stochastic factor that encompasses system uncertainties and external disturbances. Subsequently, a novel self-adapting non-monotonic prescribed-time function is proposed, integrating input saturation as an adaptive variable to dynamically adjust the constraint boundaries. This integration enables the constraint boundaries to adaptively expand in a non-monotonic manner in response to the occurrence of input saturation. Moreover, the constraint boundaries are designed as tunnel-shaped to prevent overshoot. The proposed control scheme ensures that all closed-loop signals are semi-globally uniformly ultimately bounded in probability, with the tracking error stabilized within a prescribed time. Finally, simulation results validate the effectiveness and superiority of the proposed scheme. © 2025 Elsevier Masson SAS

关键词： Stochastic models

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Integrated design fluoride carbon hybrid nanowires flexible electrode for high-performance lithium batteries

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Journal of Power Sources 2025年 648卷

作者： Wang, Chang Chen, Guowen Chen, Xiaotao Yuan, Zaifang Li, Xinlu Kang, Shusen Shi, Bin Tang, Kangkang School of Materials Science and Engineering Chongqing University Chongqing400030 China State Key Laboratory of Advanced Chemical Power Sources Guizhou Meiling Power Sources Co. Ltd Zunyi563003 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology School of Electrical Engineering Chongqing University Chongqing400030 China

The application of fluoride carbon (CFx) nanomaterials in the high-power flexible primary batteries is severely hindered by their poor conductivity and high surface energy. which makes dispersion challenging. In this study, we demonstrate a controllable strategy to construct a CFx nanoshell directly on ammonium vanadate (NH4V4O10) nanowire skeletons grown on a carbon textile substrate. This results in a new integrated NH4V4O10@CFx hybrid nanowire flexible electrode (N-textile@CFx), enabling uniform film formation of the CFx nanomaterial and delivering excellent rate performance without the need for additional conductive agents. The crystal structure, surface morphology, electronic structure and electrochemical properties are investigated through physical characterization, density functional theory (DFT), and electrochemical measurements. DFT reveals that the NH4V4O10@CFx hybrids modulate the electronic structure of CFx and enhances the electrochemical activity of C−F and V−O bonds, thereby increasing the participation of F and V atoms in the discharge reaction. Consequently, the integrated N-textile@CFx flexible battery delivers a high voltage platform and rate capacity of 452.62 mAh g−1 (5 C), retaining nearly almost 70 % of its capacity retention at −20 °C. This considerably broadens the application potential of Li/CFx batteries in high-power flexible devices. © 2025 Elsevier B.V.

关键词： Nanocomposites

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Multifunctional cascade theranostic agents for synergistic photothermal/ferroptosis/immuno antitumor therapy

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Colloids and Surfaces B: Biointerfaces 2025年 253卷 114740页

作者： Chen, Haoran Long, Fei Gan, Dechao Wang, Wang Li, Xiaodan Wu, Yihui Kong, Xianggui Chang, Yulei State Key Laboratory of Luminescence Science and Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China Department of Respiratory Medicine the First Hospital of Jilin University Changchun130021 China Key Laboratory of Optical System Advanced Manufacturing Technology Chinese Academy of Sciences Changchun130033 China

Photothermal therapy (PTT) has achieved tremendous advances against various cancers. However, it encounters uneven heat distribution caused by the limited penetration of the excitation light. Besides, the intrinsic heat resistance mechanisms in the tumor microenvironment limit antitumor efficacy and impose the potential risks of metastasis. To solve the suboptimal therapeutic effect of PTT, we have engineered photothermal agents with high photothermal conversion efficiency (PCE) in NIR-II, combined with ferroptosis therapy, to achieve an efficient tumor inhibition effect. Specifically, we develop porous Bi2Te3 with high and stable PCE (68.35 %) at NIR-II (1060 nm) for PTT. The decoration of Fe3O4 nanoparticles on the porous Bi2Te3 increased PCE to 79.25 %, which induced ferroptosis. As a result, the intracellular Fe3 +-mediated Fenton reaction process is accelerated by PTT-induced local hyperthermia, and ferroptosis increases the thermal sensitivity of the tumor cells, resulting in an excellent therapeutic effect. In addition, the tumor-associated antigen released after the synergy of PTT/ferroptosis can also cause immunogenic cell death (ICD) due to the exposure of CRT and HMGB1, which are the "eat me" signals. Notably, Bi2Te3 and its synthesis template lanthanide-doped nanoparticles (LnNPs) are excellent candidates for X-ray, photoacoustic, and optical imaging (Er3+-activated 1525 nm downshifting luminescence ). They enable real-time imaging in deep tissue penetration with a high temporal and spatial resolution to guide precise antitumor treatment in situ. Furthermore, the resultant LnNP@Bi2Te3-Fe3O4 nanocomposites (LBT-Fe) can achieve X-ray/photoacoustic/NIR-II imaging-guided synergistic ferroptosis/PTT/immuno tumor therapy. © 2025 Elsevier B.V.

关键词： Hematite

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A Hybrid Flexible Arc Suppression Method for Generator Stator Ground Faults Based on Slot Potential Analysis Unit

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IEEE Transactions on Energy Conversion 2025年

作者： Wang, Yikai Tang, Chenxiao Qiao, Jian Dai, Zhihui Wang, Zengping Yin, Xianggen North China Electric Power University (Baoding) State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Baoding 071000 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Wuhan 430074 China

For generator stator ground faults, the active arc suppression method typically needs the large-capacity inverter, leading to huge size and high cost. Moreover, the existing compensated parameter calculation method based on coil potentials cannot suppress arc at the non-coil connection points. To address these limitations, a hybrid flexible arc suppression method is proposed in this paper. By combining with the arc suppression coil grounding method, only the third harmonic and partial fundamental currents need to be compensated by the active arc suppression device, which significantly reduces the inverter capacity requirement. Instead of the coil potential analysis unit, slot potential analysis unit is used to characterize the winding potential distribution. Analytical equations are formulated to precisely calculate the fundamental and the third-harmonic fault potentials across the entire windings. The calculation results are used to determine the compensated parameters, enabling reliable arc suppression at any fault position within the entire windings. Effectiveness of the proposed method is validated by simulation and experiment. © 1986-2012 IEEE.

关键词： compensated parameters generator stator ground fault hybrid flexible arc suppression slot potential analysis

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