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Scattering model of Ce3+–doped high gadolinium fluoro–oxide glass in scintillation progress

Ceramics International 2025年第17期51卷 23367-23373页

作者： Hua, Zhehao Li, Weichang Qian, Sen Tao, Haizheng Chen, Danping Cai, Hua Han, Jifeng Huang, Feng Jia, Jinsheng Qiao, Xvsheng Ren, Jing Sun, Xin-Yuan Tang, Gao Yin, Shenghua Yuan, Huiping Zhang, Minghui State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan430070 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China China Building Materials Academy Beijing100024 China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Key Lab of Radiation Physics and Technology of MOE Sichuan University Chengdu610065 China Key Laboratory of Rare Earths Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341003 China State Key Laboratory of Silicon and Advanced Semiconductor Materials & Department of Materials Science and Engineering Zhejiang University Hangzhou310027 China College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin150001 China Department of Physics and Key Laboratory of Jiangxi Province for Special Optoelectronic Artificial Crystal Materials Jinggangshan University Ji'an343009 China College of Materials and Chemistry China Jiliang University Hangzhou310018 China Nuclear Instrument CO. LTD. Beĳing100176 China Beijing Glass Research Institute Beijing101111 China Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai201899 China

High density Gd2O3–GdF3–Al2O3–B2O3–SiO2–CeF3 (GFOx) glass scintillators with different dimensions were synthesized. The glasses have a ∼75 % transmittance in visible range with a cut off wavelength of 373 nm. With the dimension increases, the energy transfer efficiency of GFOx glasses decreases from 77.0 % to 28.3 %. And the photoluminescence quantum yield (PL QY) of all glasses exceeds 56 % with a maximum of 68.4 %. GFOx glass scintillators exhibit a X–ray excitation luminescence (XEL) spectrum in 300–600 nm, and the XEL intensity decreases with increasing dimension. Under γ–ray excitation, a scattering model was established based on the light yield and aspect ratio of the glasses. The accuracy of the model was verified by measurement of commercial BGO crystal. In GFOx glass scintillator system, the intrinsic light yield of at 10 mm thickness is 1318 ph/MeV, while light loss coefficient is −0.12. With the aspect ratio increases, the formation and transport efficiency of excitons improve due to a larger surface area and more interfaces, resulting in a faster rise time. Meanwhile, all glasses exhibit a double exponential decay, including a fast component (∼100 ns) and a slow component (∼520 ns), and shows same trend as the rise time. In addition, the photon collection efficiency of SiPM coupled with the glasses decreased from 96.2 % to 31.8 %. Because the scattered photons can hardly reach the SiPM due to poor actual light attenuation length. © 2025

关键词： Aspect ratio

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Corrigendum to “Development of a 3-DOF rotary piezoelectric actuator with compact structure” [International Journal of Mechanical Sciences, 2024, 262: 108749]

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International Journal of Mechanical Sciences 2024年 271卷

作者： Jie Deng Chenglin Yang Qingbing Chang Yingxiang Liu State Key Laboratory of Robotics and System Harbin Institute of Technology

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How Collective Intelligence Emerges in a Crowd of People Through Learned Division of Labor: A Case Study

arXiv

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arXiv 2025年

作者： Wang, Dekun Zhang, Hongwei Guangdong Provincial Key Laboratory of Intelligent Morphing Mechanisms and Adaptive Robotics School of Mechanical Engineering and Automation Harbin Institute of Technology Guangdong Shenzhen518055 China

This paper investigates the factors fostering collective intelligence (CI) through a case study of *LinYi’s Experiment, where over 2000 human players collectively con-troll an avatar car. By conducting theoretical analysis and replicating observed behaviors through numerical simulations, we demonstrate how self-organized division of labor (DOL) among individuals fosters the emergence of CI and identify two essential conditions fostering CI by formulating this problem into a stability problem of a Markov Jump Linear system (MJLS). These conditions, independent of external stimulus, emphasize the importance of both elite and common players in fostering CI. Additionally, we propose an index for emergence of CI and a distributed method for estimating joint actions, enabling individuals to learn their optimal social roles without global action information of the whole crowd. © 2025, CC BY.

关键词： Markov processes

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Low PAPR FBMC-OQAM system Based on Data Mapping and DFT Spreading

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IEEE Internet of Things Journal 2025年第12期12卷 22311-22324页

作者： Li, Liming Zhang, Jiliang Ding, Liqin Wang, Yang Zhang, Haining NingboTech University School of Information Science and Engineering Ningbo315100 China Harbin Institute of Technology Department of Electronic and Information Engineering Shenzhen518055 China Northeastern University State Key Laboratory of Synthetical Automation for Process Industries College of Information Science and Engineering Shenyang110819 China Southeast University National Mobile Communications Research Laboratory Nanjing210096 China Nankai University College of Software Tianjin300350 China

Filter bank multicarrier with offset quadrature amplitude modulation (FBMC-OQAM) is considered as a promising waveform for Internet of Things (IoT) due to its capability to mitigate interference among asynchronous users. However, as a multicarrier technique, the FBMC-OQAM signal also has a high peak-to-average power ratio (PAPR), which is detrimental to low-power transmission. To address this issue, this paper proposes a novel discrete Fourier transform (DFT)-spread scheme to exhaustively reduce the PAPR of the FBMC-OQAM signal. In this scheme, the transmitting data symbols are first mapped with a conjugate symmetry rule and then coded by the DFT. Using this method, the preprocessing step in FBMC-OQAM that involves separating the real and imaginary parts of the quadrature amplitude modulation (QAM) symbols can be avoided. Compared with existing DFT-spread FBMC-OQAM schemes, the proposed scheme demonstrates better PAPR performance while maintaining equivalent spectral efficiency. Additionally, the computational complexity of the proposed scheme experiences only a slight increase, thereby preserving a relatively low computational burden. Numerical simulation results validate the effectiveness of the proposed scheme. Furthermore, the effect of the prototype filter on the PAPR is investigated, and a trade-off exists between the PAPR and out-of-band performance. © 2014 IEEE.

关键词： Quadrature amplitude modulation

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A Novel Variable Stiffness Actuator Based on a Rocker-Linked Epicyclic Gear Train

SSRN

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SSRN 2022年

作者： Li, Zhisen Xu, Peng Huang, Hailin Ning, Yinghao Li, Bing State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150001 China School of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen518055 China Zhengzhou Electromechanical Engineering Research Institute Zhengzhou450015 China

This paper presents a novel variable stiffness actuator based on a rocker-linked epicyclic gear train (REGT-VSA). The stiffness adjustment principle of the actuator is to change the lever ratio of force by converting the differential motion of the planetary gear train into the linear motion of the elastic element. The unique design of the rocker-linked epicyclic gear train ensures the compactness of structure and the accuracy of transmission. The simultaneous relocations of the pivot and torsion spring permit a wide-range stiffness adjustment. By introducing a linear guide and a cam follower, the internal friction is reduced, and the energy efficiency is improved. A prototype and its trajectory tracking controller are developed to evaluate the performance of REGT-VSA. An exponential function is used to train the neuron proportion coefficient of the conventional single-neuron adaptive PID (proportional-integral-derivative) controller to compensate for the hysteresis of elastic elements, thus creating the dynamic single-neuron adaptive PID controller. The stiffness identification and trajectory tracking experiments under different conditions prove the feasibility of the actuator and the proposed algorithm. © 2022, The Authors. All rights reserved.

关键词： Proportional control systems

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Effects of Zr and chopped C fiber on microstructure and mechanical properties of SiBCN ceramics

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Science China(Technological Sciences) 2020年第8期63卷 1520-1530页

作者： ZHU QiShuai WANG GaoYuan LIAO XingQi LI DaXin YANG ZhiHua JIA DeChang DUAN XiaoMing HE PeiGang ZHOU Yu Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150080China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology Ministry of Industry and Information TechnologyHarbin 150080China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150080China

To further improve the thermal shock resistance and ablation resistance of SiBCN system ceramics targeted much harsh environment,both ultra-high temperature ceramic phases and carbon fibers are expected to be incorporated simultaneously as the ***,tough problems like difficulty in densification as well as degradation of C fibers(Cf)due to interfacial reaction usually cannot be ***,in this study,Zr as well as chopped Cf with BN coating were introduced into SiBCN ceramics by mechanical alloying and after hot-pressing sintering to prepare Cf/SiBCNZr *** structure and phase component development have been characterized in detail by XRD,SEM,TEM and XPS etc.,and mechanical properties,fracture behavior and toughening mechanisms were also ***-B and Zr-O bonds are detected besides Si-C,N-B and N-B-C bonds when pre-alloyed ZrB2 amorphous powder was incorporated into SiBCN system by further mechanical-alloying *** hot-pressing,the ultra-high temperature phases of ZrB2 and ZrN were formed as expected besides the original matrix phases of BN(C)and *** mechanical properties can be obtained for SiBCNZr *** BN coating on carbon fibers successfully avoids the severe fiber degradation and makes it possible for moderating strong interface bonding,which ensuring the debonding,crack deflection,fiber pulling-out and bridging during the *** a result,the Cf/SiBCNZr composites retain good mechanical properties and fractures in a pseudoplastic fracture manner,showing better potential applications in harsh *** of the BN coating on Cf and Zr incorporation by pre-mechanical alloying can be a good route to achieve Cf/SiBCNZr composites with a better balance between thermal shock resistance,ablation resistance and mechanical properties.

关键词： SiBCN ZrB2 ZrN carbon fiber BN coating chemical bond microstructure mechanical properties fracture toughening

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Constant Direct Current Triboelectric Nanogenerator Based on Soft-Contact Mode for Self-Powered Cathodic Protection

SSRN

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SSRN 2022年

作者： Li, Ming Jiang, Tianyi Ren, Yukun Jiang, Hongyuan School of Mechatronics Engineering Harbin Institute of Technology West Da-zhi Street 92 Harbin150001 China State Key Laboratory of Robotics and System Harbin Institute of Technology West Da-zhi Street 92 Heilongjiang Harbin150001 China

Triboelectric nanogenerator (TENG) has been proved to be a promising technology for harvesting decentralized energy. However, the application fields of the traditional TENGs are limited by the high crest factor. Here a constant direct current TENG (CDC-TENG) with low crest factor is proposed by connecting three rotating TENGs with specific phase difference (Δ θ ) in parallel. Excellent wear resistance and humidity resistance are demonstrated owing to the soft-contact mode and 3D encapsulated design. For the CDC-TENG (3P6E), the crest factor surprisingly decreases to 1.05 while that of the TENGs without Δ θ is up to 1.31. Meanwhile, the current density up to 3021 μA·m -2 is achieved at the rotation speed of 500 r·min -1 . Then, owing to the excellent output of constant direct current (DC), a commercial timer is directly driven by the CDC-TENG without using capacitor. Finally, the CDC-TENG is used as the power source of cathodic protection (CP) system, which exhibits an excellent corrosion protection effect. In general, this work provides a meaningful template for TENGs to broaden the marine industrial applications of constant DC demand. © 2022, The Authors. All rights reserved.

关键词： Nanogenerators

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A Soft Robotic system Imitating the Multimodal Sensory Mechanism of Human Fingers for Intelligent Grasping and Recognition

SSRN

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SSRN 2024年

作者： Xu, Jinsui Xu, Boyi Zhan, Hao Xie, Zhijie Tian, Zhen Lu, Yifan Wang, Zheping Yue, Honghao Yang, Fei South China University of Technology China State Key Laboratory of Robotics and System School of Mechatronics Engineering Harbin Institute of Technology Harbin150001 China Wu Xianming School of Intelligent Engineering South China University of Technology Guangzhou510641 China College of Mechanical and Electrical Engineering Northeast Forestry University Harbin150042 China Science and Technology on Space Physics Laboratory China Academy of Launch Vehicle Technology Beijing100000 China

The sensory function is crucial for achieving precise feedback control and environmental interaction in soft robots. Therefore, the multimodal sensory capabilities that mimic human fingers have always been a research hotspot. This study proposes a design method for a soft robotic gripper that can emulate the multimodal perception mechanism of human fingers and achieve high-precision recognition of grasped objects using machine learning algorithms. In addition, a finger texture structure inspired by human fingerprints is designed using a negative pressure-induced buckling method to enhance the soft gripper's ability to perceive minute surface textures. Inspired by slow adapting (SA) receptors and fast adapting (FA) receptors of human fingers, this study designs a capacitive curvature sensor (CS) and a triboelectric texture sensor (TS) to detect the size, material, and texture of objects. Furthermore, a non-contact medium identification sensor (MIS), having a sensitivity of more than 1300 times higher compared to the traditional MISs, is fabricated using the principle of electromagnetic resonance. It is shown that by employing a deep learning-based multi-channel feature fusion network, the soft grasping system with multimodal sensing can achieve an object recognition accuracy of 98.43%. This work provides an innovative approach for the application of soft robots in various fields, such as logistics sorting and food safety. © 2024, The Authors. All rights reserved.

关键词： Textures

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Electric Polarization and Magnetic Properties of (NH4)1–xKxI (x = 0.05–0.17)

arXiv

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arXiv 2024年

作者： Xu, Yi Yang Meng, Lei Zhao, Miao Miao Peng, Chu Xin Yen, Fei State Key Laboratory on Tunable Laser Technology Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System The School of Science Harbin Institute of Technology Shenzhen University Town Guangdong Shenzhen518055 China

While all of the polymorphs of pure NH4I and KI are non-polar, we identify that (NH4)0.95K0.05I is ferroelectric and (NH4)0.87K0.13I and (NH4)0.83K0.17I are pyroelectric through measurements of their pyroelectric current and complex dielectric constant. The order to disorder phase transitions occur near 245 K. Magnetic susceptibility measurements indicate that the proton orbitals of the NH4+ continue to become ordered in the ground state in the (NH4)1–xKxI system up to x ≤ 0.17. The polar phases are proposed to stem from K+ ions disrupting the symmetry of proton-orbital-lattice interactions between the NH4+ and I– ions. Our work introduces a new pathway for the ordered phases of ammonium-based compounds to potentially become ferroelectric. © 2024, CC BY-NC-ND.

关键词： Ferroelectric materials

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Ferroelectricity Driven by Orbital Resonance of Protons in CH3NH3Cl and CH3NH3Br

arXiv

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arXiv 2024年

作者： Peng, Chu Xin Meng, Lei Xu, Yi Yang Xing, Tian Tian Zhao, Miao Miao Ren, Peng Yen, Fei State Key Laboratory on Tunable Laser Technology Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System The School of Science Harbin Institute of Technology Shenzhen University Town Guangdong Shenzhen518055 China

The β and γ phases of methylammonium chloride CH3NH3Cl and methylammonium bromide CH3NH3Br are identified to be ferroelectric via pyroelectric current and dielectric constant measurements. The magnetic susceptibility also exhibits pronounced discontinuities at the Curie temperatures. We attribute the origin of spontaneous polarization to the emergence of two groups of proton orbital magnetic moments from the uncorrelated motion of the CH3 and NH3 groups in the β and γ phases. The two inequivalent frameworks of intermolecular orbital resonances interact with each other to distort the lattice in a non-centrosymmetric fashion. Our findings indicate that the structural instabilities in molecular frameworks are magnetic in origin as well as provide a new pathway toward uncovering new organic ferroelectrics. © 2024, CC BY-NC-ND.

关键词： Ferroelectric materials

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