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Multi-Order Neighborhood Fusion Based Multi-View deep Subspace Clustering

Computers, Materials & Continua 2025年第3期82卷 3873-3890页

作者： Kai Zhou Yanan Bai Yongli Hu Boyue Wang Department of Automation Tsinghua UniversityBeijing100084China National Center of Technology Innovation for Intelligentization of Politics and Law Beijing100000China Beijing Key Lab of Intelligent Telecommunication Software and Multimedia Beijing University of TechnologyBeijing100124China

Existing multi-view deep subspace clustering methods aim to learn a unified representation from multi-view data,while the learned representation is difficult to maintain the underlying structure hidden in the origin samples,especially the high-order neighbor relationship between *** overcome the above challenges,this paper proposes a novel multi-order neighborhood fusion based multi-view deep subspace clustering *** creatively integrate the multi-order proximity graph structures of different views into the self-expressive layer by a multi-order neighborhood fusion *** this design,the multi-order Laplacian matrix supervises the learning of the view-consistent self-representation affinity matrix;then,we can obtain an optimal global affinity matrix where each connected node belongs to one *** addition,the discriminative constraint between views is designed to further improve the clustering performance.A range of experiments on six public datasets demonstrates that the method performs better than other advanced multi-view clustering *** code is available at https://***/songzuolong/MNF-MdSC(accessed on 25 december 2024).

关键词： Multi-view subspace clustering subspace clustering deep clustering multi-order graph structure

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Communication resources Allocation for Time delay reduction of Frequency regulation Service in High renewable Penetrated Power System

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 468-480页

作者： Hongjie He Ning Zhang Chongqing Kang Song Ci Fei Teng Goran Strbac State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Department of Electrical and Electronic Engineering Imperial College LondonSW72BULondonU.K

The high renewable penetrated power system has severe frequency regulation *** resources can provide frequency regulation services but are limited by com-munication time *** paper proposes a communication resources allocation model to reduce communication time delay in frequency regulation *** device resources and wireless spectrum resources are allocated to distributed resources when they participate in frequency *** reveal impact of communication resources allocation on time delay reduction and frequency regulation ***,we study communication resources allocation solution in high renewable energy penetrated power *** provide a case study based on the HrP-38 *** show communication time delay decreases distributed resources'ability to provide frequency regulation *** the other hand,allocating more communication resources to distributed resources'communica-tion services improves their frequency regulation *** power systems with renewable energy penetration above 70%,required communications resources are about five times as many as 30%renewable energy penetrated power systems to keep frequency performance the *** Terms-Communication resources allocation,commun-ication time delay,distributed resource,frequency regulation,high renewable energy penetrated power system.

关键词： Communication resources allocation communication time delay distributed resource frequency regulation high renewable energy penetrated power system

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dual-branch vision transformer for low-resolution action recognition

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Multimedia Tools and Applications 2025年 1-20页

作者： Chen, ruixin Gao, Chenqiang Tan, Zhuolin Liu, Fangxin Yu, Jiayi Li, Xinlin School of Communications and Information Engineering Chongqing University of Posts and Telecommunications Chongqing400065 China School of Intelligent Systems Engineering Shenzhen Campus of Sun Yat-sen University Guangdong Shenzhen518107 China

The field of action recognition has primarily focused on identifying complex actions in high-quality videos, yet recognizing low-resolution movements remains a critical challenge with practical applications in real-world surveillance scenarios. This paper proposes a dual-branch vision transformer to address the spatiotemporal feature learning challenges in low-resolution action recognition. Our architecture employs distinct processing pathways: the primary branch captures spatial patterns using reduced frame rates, whereas the auxiliary branch operates at higher temporal resolution with spatial downsampling. Continuous feature interaction between branches is facilitated through cross-attention modules, enabling complementary spatiotemporal learning. This architectural separation allows targeted feature extraction: spatial analysis benefits from temporal context refinement while motion patterns gain enhanced spatial grounding. To validate our approach, we contributed a novel classroom behavior dataset containing 7,722 annotated videos (6,776 training / 1,546 tests) across 11 student action categories, captured through university surveillance systems. Experimental results demonstrate state-of-the-art performance with 75.20% F1-score on TinyVIrAT-v2 and 83.41% top-1 accuracy on our classroom dataset, outperforming existing baselines with only 13.68% additional computational overhead compared to single-branch transformers. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2025.

关键词： Security systems

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An experimental study on effects of temperature gradient on microstructure of a 308L stainless steel manufactured by directed energy deposition

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Journal of Iron and Steel research International 2024年第8期31卷 2031-2040页

作者： Ting dai de-yu Gu Yu-wen Qiu Wei Guo Hui ding Yi-wei Sun School of Materials Science and Engineering Jiangsu Key Laboratory of Advanced Metallic MaterialsSoutheast UniversityNanjing 211189JiangsuChina

The effect of spatial temperature gradient on the microstructural evolution of a 308L stainless steel during the directed energy deposition(dEd)process was experimentally investigated.A novel cooling system was designed and incorporated to a dEd system in order to control the temperature gradient along the deposition direction during *** deposition,the workpiece was placed on a lifting platform,and as the deposition process proceeded,the platform and workpiece were gradually lowered into cooling water so that the temperature gradient along the deposition direction could be controlled and maintained stable during the deposition *** microstructure characterization results indicated that a deposition strategy with higher G and G/r values(where G is temperature gradient and r is solidification rate)produced finer cellular grains that were better aligned with the deposition direction,while a deposition strategy with lower G and G/r values produced columnar grains with larger primary arm spacing and less aligned with the deposition direction.

关键词： Additive manufacturing directed energy deposition Stainless steel Microstructure Temperature gradient

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Small-size temperature/high-pressure integrated sensor via flip-chip method

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Microsystems & Nanoengineering 2024年第4期10卷 153-162页

作者： Mimi Huang Xiaoyu Wu Libo Zhao Xiangguang Han Yong Xia Yi Gao Zeyu Cui Cheng Zhang Xiaokai Yang Zhixia Qiao Zhikang Li Feng Han Ping Yang Zhuangde Jiang State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesXi’an Jiaotong UniversityXi’an 710049China Xi’an Jiaotong University(Yantai)Research Institute for Intelligent Sensing Technology and System Xi’an Jiaotong UniversityXi’an 710049China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 265503China School of Mechanical Engineering Xi’an Jiaotong University710049 Xi’anChina School of Instrument Science and Technology Xi’an Jiaotong University710049 Xi’anChina Chongqing Key Laboratory of Micro-Nano Systems and Intelligent Sensing Chongqing Academician WorkstationChongqing 2011 Collaborative Innovation Center of Micro/Nano Sensing and Intelligent Ecological Internet of ThingsChongqing Technology and Business UniversityNan’an DistrictChongqing 400067China Xi’an Aerospace Yuanzheng Fluid Control Co.Ltd. Xi’an 710049China

Hydraulic technology with smaller sizes and higher reliability trends,including fault prediction and intelligent control,requires high-performance temperature and pressure-integrated *** designs rely on planar wafer-or chip-level integration,which is limited by pressure range,chip size,and low *** propose a small-size temperature/high-pressure integrated sensor via the flip-chip *** pressure and temperature units are arranged vertically,and the sensing signals of the two units are integrated into one plane through silicon vias and gold–gold bonding,reducing the lateral size and improving the efficiency of signal *** flip-chip technique ensures a reliable electrical connection.A square diaphragm with rounded corners is designed and optimised with simulation to sense high pressure based on the piezoresistive *** temperature sensing unit with a thin-film platinum resistor measures temperature and provides back-end high-precision compensation,which will improve the precision of the pressure *** integrated chip is fabricated by MEMS technology and packaged to fabricate the extremely small integrated *** integrated sensor is characterised,and the pressure sensor exhibits a sensitivity and sensitivity drift of 7.97mV/MPa and−0.19%FS in the range of 0–20 MPa and−40 to 120℃.The linearity,hysteresis,repeatability,accuracy,basic error,and zero-time drift are 0.16%FS,0.04%FS,0.06%FS,0.18%FS,±0.23%FS and 0.04%FS,*** measurement error of the temperature sensor and temperature coefficient of resistance is less than±1°C and 3142.997 ppm/℃,*** integrated sensor has broad applicability in fault diagnosis and safety monitoring of high-end equipment such as automobile detection,industrial equipment,and oil drilling platforms.

关键词： size corners sizes

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A highly integrated three-axis vector diamond quantum magnetometer with a compact electrical package

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APPLIEd PHYSICS LETTErS 2025年第8期126卷

作者： Peng, Xiao Xie, Fei Zhu, Yaochen Luo, Xin Liu, Qihui Wang, dan Hu, Yuqiang Han, Jiachen Li, Lingyun Liu, Jianping Chen, Hao Cheng, Jiangong Wu, Zhenyu Chinese Acad Sci Shanghai Inst Microsyst & Informat Technol State Key Lab Transducer Technol Shanghai 200050 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Shanghai Univ Sch Microelect Shanghai 200444 Peoples R China Shanghai Ind Technol Res Inst Shanghai 201800 Peoples R China Suzhou Ganbright Optoelect Technol Co Ltd Suzhou 215153 Peoples R China Chinese Acad Sci Shanghai Inst Microsyst & Informat Technol Ctr Excellence Superconducting Elect Shanghai 200050 Peoples R China Chinese Acad Sci Suzhou Inst Nanotech & Nanob Suzhou 215123 Peoples R China

diamond nitrogen-vacancy (NV) center has been widely studied as a high-sensitivity solid-state quantum sensor with a wide range of applications, including magnetometry, thermometry manometry, and chemical sensing. However, its application in practical scenarios remains challenging due to difficulties of component manufacturing, miniaturization, and integration for NV control and readout. Here, we demonstrate an all-electric driving diamond sensor fabricated using standard microfabrication processes and micro-assembly, achieving integration of five key components-laser diode, diamond, microwave antenna, long pass filter, and photodiode in a hermetically sealed package case, with dimensions of 2.72 cm(3). The integrated diamond magnetometer achieved a magnetic sensitivity of 2.25 nT. Hz(-1/2). Additionally, the inherent crystallographic axes of the diamond are used to simultaneously detect vector magnetic field signals. The design and fabrication process allows for wafer-level assembly, enabling low-cost mass-production and easy integration with peripheral circuits.

关键词： Microfabrication

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Pyrrolic nitrogen coordinated Ni^(2+) dual-atom catalyst for boosting CO_(2) electroreduction

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Science china Chemistry 2025年第2期68卷 570-579页

作者： Zhi-Wei Chen Hong-Juan Wang Chang Liu Xiu-Li Lu Tong-Bu Lu MOE International Joint Laboratory of Materials Microstructure Institute for New Energy Materials and Low Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China

Nitrogen-doped carbon materials have been widely used for the constructions of single-atom catalysts,while the effect of different species of doped nitrogen on the catalytic activity of CO_(2) electroreduction has rarely been *** we found that pyrrolic-N coordinated Ni2+catalysts display much higher electrocatalytic CO_(2)-to-CO activity and selectivity than the corresponding pyridinic-N coordinated low valent Ni^((0–+2))catalysts,and pyrrolic-N coordinated Ni2 dual-atoms catalyst of Ni2/N-CNTs exhibits the best electrocatalytic performance,with over 90%Faradaic efficiencies in a broad potentials from−0.6 to−1.2 V *** hydrogen electrode,as well as an outstanding CO specific current of 56.2 A/mgNi and high turnover frequency of 6.2×10^(4) h^(−1),over 7-times higher than those of pyridinic-N coordinated Ni *** results indicate the weak electron-donor nature of pyrrolic-N facilitates the generation of a reduced active site at low overpotential for boosting CO_(2) *** functional theory calculations reveal that the reaction free energy for the*COOH formation on pyrrolic-N coordinated Ni catalysts are lower than those on pyridinic-N coordinated Ni catalysts,and a H_(2)Oadsorbed Ni_(2)/N-CNTs displays the optimized reaction free energy for both*COOH formation and CO desorption,which derive the best catalytic performance.

关键词： dual-atom catalyst CO_(2) electroreduction synergistic catalysis pyrrolic-N pyridinic-N

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Unique composite architecture of phosphor-in-glass film coated on different heat-conducting substrates for high-brightness laser lighting

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Journal of Advanced Ceramics 2025年第2期14卷 151-158页

作者： Xin Liu Mingxiang Chen Jiuzhou Zhao Hongjin Zhang Yang Peng Qing Wang State Key Laboratory of Intelligent Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Aerospace Engineering Huazhong University of Science and TechnologyWuhan 430074China School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan 430074China

In the development of static luminescent materials with remarkable optical-thermal performance and low cost, next-generation high-brightness laser lighting faces a key challenge. Herein, a unique composite architecture of Y3Al5O_(12):Ce^(3+) (YAG) phosphor-in-glass film coated on different heat-conducting substrates (PiGF@HCSs), i.e., PiGF@sapphire, PiGF@Al_(2)O_(3), PiGF@AlN, and PiGF@BN–AlN composites, was designed and prepared by a simple film printing and low-temperature sintering technology. The heat-conducting substrates significantly affect the luminescence saturation and phosphor conversion of PiGF@HCSs, allowing substrates with higher thermal conductivity (TC) to have a higher laser power density (LPd) and higher reflectivity to enable higher luminous efficacy (LE). As a consequence, PiGF@sapphire realizes a luminous flux (LF) of 2076 lm@12 W/mm^(2), which is higher than those of PiGF@Al_(2)O_(3) (1890 lm@15 W/mm^(2)) and PiGF@AlN (1915 lm@24 W/mm^(2)), whilePiGF@BN–AlN enables a maximum LF of 3058 lm@21 W/mm^(2). Furthermore, the LE of PiGF@BN–AlN reaches 194 lm/W, which is 1.6 times that of PiGF@AlN, while those of PiGF@sapphire and PiGF@Al_(2)O_(3) are 192 and 150 lm/W, respectively. The working temperature of PiGF@AlN is only 93.3℃ under LPd of 9 W/mm^(2), while those of PiGF@sapphire, PiGF@Al_(2)O_(3), and PiGF@BN–AlN increase to 193.8, 133.6, and 117℃, respectively. These findings provide guidance for commercial applications of PiGF@HCS converters in high-brightness laser lighting and displays.

关键词： luminescent materials phosphor-in-glass film(PiGF) heat-conducting substrate(HCS) laser lighting optical-thermal performances

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Low-complexity channel estimation for wideband mmWave massive MIMO systems with uniform planar arrays

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The Journal of china Universities of Posts and Telecommunications 2025年第1期32卷 1-10页

作者： Wang Haotian Liu Lizhou Qiu Ling Zhang Lei School of Electronic and Information Engineering University of Science and Technology of ChinaHefei 230022China

Millimeter-wave(mmWave) and massive multiple-input multiple-output(MIMO) are broadly recognized as key enabling technologies for the fifth generation(5G) communication systems. In this paper, a low-complexity angle-delay parameters estimation(AdPE) algorithm was put forward for wideband mmWave systems with uniform planar arrays(UPAs). In particular, the AdPE algorithm effectively decouples the angle-delay parameters and converts the angle-delay estimation problem into three independent subproblems. Accordingly, the ability to devise an off-grid method based on discrete Fourier transform(dFT) with a closed-form solution for angle-delay estimation and potential path number acquisition can be realized. In actuality, only a limited number of potential paths are close to the true paths influenced by noise. Consequently, the removal of noise paths to acquire the corresponding true path gains through a sparsity adaptive path gains estimation(APGE) algorithm is postulated. Finally, the simulation results substantiate the effectiveness of AdPE and APGE algorithms.

关键词： wideband millimeter-wave(mmWave) massive multiple-input multiple-out(MIMO) low-complexity uniform planar array(UPA) channel estimation

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Transparent PVdF-based electrolyte enabled by lipophilic lithium magnesium silicate for solid-state lithium batteries

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rare Metals 2024年第11期43卷 5625-5636页

作者： Yue Zhang Jun-Hong Li Man Ge Yun-Hui Huang Heng-Hui Xu School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

Solid-state batteries with solid polymer electrolytes are considered the most promising due to their high energy density and safety ***,their development is hindered by the limitations of polymer electrolytes,such as low ionic conductivity,poor mechanical strength and inadequate fire *** study presents a thin polyvinylidene fluoride-based composite solid electrolyte film(25μm incorporating twodimensional modified lipophilic lithium magnesium silicate(LLS)as additives with good *** incorporation of LLS promotes grain refinement in polyvinylidene fluoride(PVdF),enhances the densification of electrolyte films,increases the tensile strength to10.42 MPa and the elongation to 251.58%,improves ion transport interfac e,and facilitates uniform deposition of lithium ***,LLS demonstrates strong adsorption ability,promoting the formation of solvated molecules,resulting in high ionic conductivity(2.07×10^(-4)S·cm^(-1)at 30℃)and a stable lithium/electrolyte *** Li//Li cells assembled with the thin composite electrolytes exhibit stable cycling for2000 h at 0.1 mA·cm^(-2)and 0.05 mAh·cm^(-2).Additionally,the LiFePO_(4)//Li battery shows a capacity retention rate of99.9%after 200 cycles at 0.5C and room temperature.

关键词： Filler Lithium magnesium silicate Polymer electrolytes Batteries

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