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Pure-quartic soliton molecules in normal fourth-order dispersion regimes based on spectral filtering effect

Chinese Physics B 2025年第3期34卷 400-406页

作者： Han-Yang Shen Rui-Bo Lan Hong-Bin Hu Yang Li Rui Zhou Zu-Xing Zhang Advanced Photonic Technology Laboratory College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology)Nanjing University of Posts and TelecommunicationsNanjing 210023China

Recent theoretical verification of self-similar and dissipative pure-quartic solitons(PQSs)emphasized the similarity between PQS lasers and conventional fiber lasers,but the unique equilibrium mechanism hinders the formation of PQS molecules in normal fourth-order dispersion(FOD)*** this paper,we investigated the effect of filters on shaping PQSs in normal FOD based on a passively mode-locked fiber laser model.A bandpass filter eliminates the time pedestal of dissipative PQSs,thus realizing a multi-pulsing *** the filter bandwidth is appropriate,the effective spectral filtering effect can lower the pulse splitting threshold and enable the coherent restoration from chaotic PQSs to PQS ***,changing the central wavelength of the filter can generate PQSs and PQS molecules with asymmetric intensity *** results are important guides for the manipulation of PQSs and the construction of high repetition-frequency fiber lasers.

关键词： pure-quartic soliton soliton molecule spectral filtering effect mode-locked fiber laser

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Multi-Scale Time Series Segmentation Network Based on Eddy Current Testing for Detecting Surface Metal Defects

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IEEE/CAA Journal of Automatica Sinica 2025年第3期12卷 528-538页

作者： Xiaorui Li Xiaojuan Ban Haoran Qiao Zhaolin Yuan Hong-Ning Dai Chao Yao Yu Guo Mohammad S.Obaidat George Q.Huang the School of Intelligence Science and Technology University of Science and Technology Beijing the Beijing Advanced Innovation Center for Materials Genome Engineering the Key Laboratory of Intelligent Bionic Unmanned Systems and the Institute of Materials Intelligent Technology Liaoning Academy of Materials IEEE the Department of Computer Science Hong Kong Baptist University the School of Computer and Communication Engineering Key Laboratory of Advanced Materials and Devices for Post-Moore Chips Ministry of Education University of Science and Technology Beijing the Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing the School of Computer and Communication Engineering University of Science and Technology Beijing the King Abdullah Ⅱ School of Information Technology The University of Jordan the Department of Computational Intelligence the School of Computing SRM University the School of Engineering The Amity University The Hong Kong Polytechnic University

In high-risk industrial environments like nuclear power plants, precise defect identification and localization are essential for maintaining production stability and safety. However, the complexity of such a harsh environment leads to significant variations in the shape and size of the defects. To address this challenge, we propose the multivariate time series segmentation network(MSSN), which adopts a multiscale convolutional network with multi-stage and depth-separable convolutions for efficient feature extraction through variable-length templates. To tackle the classification difficulty caused by structural signal variance, MSSN employs logarithmic normalization to adjust instance distributions. Furthermore, it integrates classification with smoothing loss functions to accurately identify defect segments amid similar structural and defect signal subsequences. Our algorithm evaluated on both the Mackey-Glass dataset and industrial dataset achieves over 95% localization and demonstrates the capture capability on the synthetic dataset. In a nuclear plant's heat transfer tube dataset, it captures 90% of defect instances with75% middle localization F1 score.

关键词： Eddy current testing nondestructive testing semantic segmentation time series analysis

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BlindFG: Learning Contextual Fishing Trajectories for Unreported Fishing Gear Classification

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IEEE Access 2025年 13卷 71598-71610页

作者： Lee, Changha Youn, Chan-Hyun Korea Advanced Institute of Science and Technology School of Electrical Engineering Daejeon34141 Korea Republic of

Unreported position data of fishing vessels significantly hinder the accurate identification of their behaviors. AIS (Automatic Identification System) data—a self-reporting tool used for vessel tracking—is often incomplete because IUU fishing vessels deliberately turn it off to evade detection. In this paper, we propose BlindFG, a novel framework for unreported fishing gear classification that leverages a fishing-conditioned latent space to overcome the limitations imposed by AIS-off periods. BlindFG integrates a Fishing-Conditioned Generative Model (FCGen) with a Fishing Context Sommelier (FCSom) to both reconstruct missing trajectory data and classify vessel fishing types under partial AIS availability. FCGen employs a conditional variational architecture, incorporating fishing context embeddings derived from one-hot encoded fishing gear labels to guide the generation of AIS-Off trajectories. FCSom utilizes the completed trajectories within a 1D convolutional classification framework. By aggregating candidate predictions across multiple fishing type hypotheses, the system effectively discriminates among various fishing behaviors, even in the presence of partial AIS data. Experimental results on global datasets demonstrate that BlindFG significantly improves the accuracy of fishing type classification and offers a robust solution for enhancing maritime situational awareness and combating IUU fishing activities. Experimental evaluations demonstrate that our method significantly enhances the prediction of vessel trajectories and the accurate classification of AIS-off fishing practices worldwide. © 2013 IEEE.

关键词： Fisheries

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Characteristics of PVD SiCN for Application in Hybrid Cu Bonding

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Journal of Semiconductor technology and Science 2025年第1期25卷 102-108页

作者： Choi, Junyoung Jang, Suin Lee, Dongmyeong Kang, Sukkyung Kim, Sanha Kim, Sarah Eunkyung Department of Semiconductor Engineering Seoul National University of Science and Technology Korea Republic of Department of Mechanical Engineering Korea Advanced Institute of Science and Technology Korea Republic of

To enhance the density and performance of semiconductor devices, 3D packaging with hybrid Cu bonding is emerging as a critical technology. One of the dielectrics used in hybrid Cu bonding is SiCN, typically deposited using PECVD (plasma-enhanced chemical vapor deposition). In this study, we investigated SiCN deposited at room temperature using PVD (physical vapor deposition). The SiCN, with a thickness of 150 nm, exhibited a surface roughness of 0.3-0.4 nm after the CMP (chemical mechanical polishing) process and a contact angle of about 10 degrees and dielectric constant of 3.9, indicating its potential as a dielectric for hybrid Cu bonding. And, PVD SiCN-SiCN bonding was performed at 260◦C, resulting in a uniform and void-free interface. © 2025, Institute of Electronics Engineers of Korea. All rights reserved.

关键词： Chemical mechanical polishing

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Pushing working voltage of nickel-rich cathode to 4.6 V by stabilizing lattice oxygen redox via spinel Li_(4)Mn_5O_(12)coating

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Journal of Energy Chemistry 2025年第4期103卷 692-702页

作者： Yunting Wang Gaohui Du Di Han Jiahao Deng Weihao Shi Huayu Li Yongle Wang Siyao Wang Zhan Gao Youqing Wang Shixian Chen Wenqi Zhao Qingmei Su Bingshe Xu Materials Institute of Atomic and Molecular Science Shaanxi University of Science and TechnologyXi’an 710021ShaanxiChina Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030024ShanxiChina Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

Augmenting the working voltage is an effective way to maximize the energy density of Ni-rich layered Li[Ni_(0.8)Co_(0.1)Mn_(0.1)]O_(2)(NCM)to approach its theoretical ***,NCM suffers from structural degradation in deep delithiation state,which is often accompanied by severe surface lattice oxygen loss and transition metal dissolution,leading to restricted cycle ***,a facile and effective surfacestrengthening strategy is proposed,in which Mn(OH)_(2)nanoshells are uniformly grown on the NCM surface as a Li~+capturer and then converted to thin spinel Li_(4)Mn_5O_(12)layers during subsequent hightemperature *** resultant Li_(4)Mn_5O_(12)layers can enhance cathode-electrolyte interface electrochemical stability with inhibited electrolyte corrosion and accelerated Li~+*** theoretical calculations confirms that the Mn-O bonds formed at the interfaces can effectively decrease the oxygen activity,thereby further inhibiting the lattice oxygen release and structural degradation caused by the irreversible phase ***,the Li_(4)Mn_5O_(12)-coated NCM displays high capacity retention of 80.3%and 94.9%at 1 C and 5 C compared to the pristine NCM(52.5%and 10.1%)after 200 cycles and can operate stably at 2.7-4.6 V and 60℃.The spinel Li_(4)Mn_5O_(12)-coating demonstrates an effective route to enhance the structural/electrochemical stability of NCM for next-generation advanced lithium-ion batteries.

关键词： Ni-rich cathode Interfacial stability Li_(4)Mn_5O_(12)coating High voltage stability

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Preparation of silver nanoparticles through the reduction of straw-extracted lignin and its antibacterial hydrogel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 504-514页

作者： Lou Zhang Shuo Li Fu Tang Jingkai Zhang Yuetong Kang Hean Zhang Lidong Li State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Silver nanoparticles(Ag NPs)have attracted attention in the field of biomaterials due to their excellent antibacterial ***,the reducing and stabilizing agents used for the chemical reduction of Ag NPs are usually toxic and may cause water *** this work,Ag NPs(31.2 nm in diameter)were prepared using the extract of straw,an agricultural waste,as the reducing and stabilizing *** analysis revealed that the straw extract contained lignin,the structure of which possesses phenolic hydroxyl and methoxy groups that facilitate the reduction of silver salts into Ag *** surfaces of Ag NPs were negatively charged due to the encapsulation of a thin layer of lignin molecules that prevented their *** the prepared Ag NPs were added to the precursor solution of acrylamide,free radical polymerization was triggered without the need for extra heating or light irradiation,resulting in the rapid formation of an Ag NP-polyacrylamide composite *** inhibition zone test proved that the composite hydrogel possessed excellent antibacterial ability due to the presence of Ag *** prepared hydrogel may have potential applications in the fabrication of biomedical materials,such as antibacterial dressings.

关键词： silver nanoparticles hydrogel straw extraction antibacterial

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Synergistic Enhancement of Mechanical Properties and Electrical Conductivity of Immiscible Bimetal:A Case Study on W–Cu

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engineering 2025年第3期46卷 224-235页

作者： Qixiang Duan Chao Hou Tielong Han Yurong Li Haibin Wang Xiaoyan Song Zuoren Nie Key Laboratory of Advanced Functional Materials Ministry of EducationCollege of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China

Immiscible bimetal systems,of which tungsten–copper(W–Cu)is a typical representative,have crucial applications in fields requiring both mechanical and physical ***,it is a major challenge to determine how to give full play to the advantages of the two phases of the bimetal and achieve outstanding comprehensive *** this study,an ultrafine-grained W–Cu bimetal with spatially connected Cu and specific Wislands was fabricated through a designed powder-mixing process and subsequent rapid low-temperature *** prepared bimetal concurrently has a high yield strength,large plastic strain,and high electrical *** stress distribution and strain response of individual phases in different types of W–Cu bimetals under loading were quantified by means of a *** high yield strength of the reported bimetal results from the microstructure refinement and high contiguity of the grains in the W islands,which enhance the contribution of W to the total plastic deformation of the *** high electrical conductivity is attributed to the increased mean free path of the Cu and the reduced proportion of phase boundaries due to the specific phase combination of W islands and *** work provides new insight into modulating phase configuration in immiscible metallic composites to achieve high-level multi-objective properties.

关键词： Immiscible bimetal Phase configuration Mechanical property Electrical conductivity Strain response

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Multi-objective Optimization of Double-D Orthogonal Coil in the Underwater Environment

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IEEE Transactions on Industry Applications 2025年第3期61卷 4155-4166页

作者： Wang, Fangyong Zhu, Jinwei Sun, Aoni Liu, Bangyin State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

A structural optimization design method of DD orthogonal coil in the seawater environment is introduced in this paper, which is suitable for underwater AUV equipment. The electromagnetic field model considering the effect of the high conductivity of seawater medium is established. The Eddy current equivalent resistance is introduced to characterize the eddy current loss caused by seawater medium. The relationship between eddy current equivalent resistance and DD orthogonal coil structure size is analyzed, and the influence of structure parameters on power transfer efficiency in seawater medium is further pointed out. The analysis results show that the DD orthogonal coil in seawater medium has an extreme point of optimal design when the power transfer efficiency and power transfer density are the optimization objectives. NSGA-II algorithm is used to optimize the structure parameters of the DD orthogonal coil. The coil efficiency is obtained by finite element simulation. Pareto frontier curve under effective constraints. Finally, a 3.3- kW experimental prototype was built to verify the feasibility. The DD orthogonal coil power transfer density is 33.78 kW/m2. The experimental results indicate that the power transfer efficiency of 91.92% is achieved with the power of 2.3kW and transmission distance is 100mm © 2025 IEEE.

关键词： Coils Eddy currents Couplings Integrated circuit modeling Analytical models Inductance Electric fields Conductivity Atmospheric modeling Structural engineering

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Co@C-N as an electronic mediator anchored with Cu2O nanoparticles enables efficient photoreduction of CO2 to CO with nearly 100% selectivity

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Science China Chemistry 2025年第5期68卷 2160-2169页

作者： Xingbin Pan Xiuzheng Deng Jingshan Fan Jiangchuan Liu Changhai Liu Zhongyu Li Qian Liang Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology CNPC-CZU Innovation AllianceSchool of Petrochemical EngineeringChangzhou University School of Materials Science & Engineering Changzhou University

Solar-driven CO2conversion into value-added chemical provides an attractive strategy for sustainable ***,the enhanced CO2photoreduction performance with target product selectivity remains a major ***,we develop a novel strategy involving Cu2O nanoparticles in situ grown on the surface of ZIF-67-derived Co@C-N nanocages（CC） to create abundant active sites and appropriate heterointerfaces.A remarkable CO selectivity of 95.7% with a yield of 117.39 μmol g-1h-1and an apparent quantum efficiency as high as 1.88% at 420 nm was obtained over CC-60 catalyst in pure water,which was 87.6 times higher than that of pure *** calculations and experiments indicated that Co@C-N nanocages as charge mediator not only rapidly trap photogenerated electrons to promote charge separation efficiency,but also regulate the d-band center of Cu atoms to move to the Fermi energy level,thereby optimizing the reaction kinetics to facilitate the highly selective conversion of the key intermediate*CO desorption to CO.

关键词： Co nanocage electronic mediator interface regulation photocatalytic CO2 reduction high selectivity

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Mechanical and electrochemical properties of(MoNbTaTiZr)1-xNx high-entropy nitride coatings

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材料科学技术（英文版） 2025年第5期208卷 78-91页

作者： Wei Yang Jianxiao Shen Zhenyu Wang Guanshui Ma Peiling Ke Aiying Wang Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

High-entropy materials possess high hardness and strong wear resistance,yet the key bottleneck for their practical applications is the poor corrosion resistance in harsh *** this work,the high-entropy nitride(HEN)coatings of(MoNbTaTiZr)1-xNx(x=0-0.47)were fabricated using a hybrid di-rect current magnetron sputtering *** research focus was dedicated to the effect of nitrogen content on the microstructure,mechanical and electrochemical *** results showed that the as-deposited coatings exhibited a typical body-centered cubic(BCC)structure without nitrogen,while the amorphous matrix with face-centered cubic(FCC)nanocrystalline grain was observed at x=*** increasing x in the range of 0.35-0.47 caused the appearance of polycrystalline FCC phase in *** with the MoNbTaTiZr metallic coating,the coating containing nitrogen favored the high hard-ness around 13.7-32.4 GPa,accompanied by excellent tolerance both against elastic and plastic ***,such N-containing coatings yielded a low corrosion current density of about 10-8-10-7 A/cm2 and high electrochemical impedance of 106 Ω cm2 in 3.5 wt.％NaCl solution,indicating the supe-rior corrosion *** reason for the enhanced electrochemical behavior could be ascribed to the spontaneous formation of protective passive layers over the coating surface,which consisted of the domi-nated multi-elemental oxides in chemical ***,noted that the(MoNbTaTiZr)0.83N0.17 coat-ing displayed the highest hardness of 32.4±2.6 GPa and H/E ratio at 0.09,together with remarkable cor-rosion resistance,proposing the strongest capability for harsh-environmental applications required both good anti-wear and anti-corrosion performance.

关键词： High-entropy nitride Magnetron sputtering Microstructure Mechanical property Corrosion behavior

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