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Controlled propagation and particle manipulation of off-axis-rotating elliptical Gaussian beams in strong nonlocal media

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Chinese Physics B 2025年第3期34卷 415-422页

作者： Rong-Quan Chen Rui-Lin Xiao Wei Wang Xi-Xi Chu Yu-Qing Song Xu-Dong Hu Ming Chen Guangxi Key Laboratory of optoelectronic Information Processing School of Optoelectronic EngineeringGuilin University of Electronic TechnologyGuilin 541004China school of Physics Anshan Normal UniversityAnshan 114007China

Off-axis-rotating elliptical Gaussian beams(Oare GB)oblique incidence in strong nonlocal medium exhibit novel propagation *** analytical expressions of semi-axial beam widths,and center-of-mass trajectory equations for transmitting off-axis-rotating elliptical Gaussian beams in strong nonlocal media are obtained using the ABCD transfer matrix *** study revealed that the trajectory of the mass's center in the cross-section can be controlled by changing the sizes of the Oare GB parameters c,d,ζ,and *** gradient force of the light field causes the spot region to form a spatial potential well in the media,and this spatial potential well can effectively capture *** particles captured by the light field can move along with the beam,realizing the effective manipulation of the particle *** laws may be applied to modulating the propagation path of light beams and optical tweezer technology.

关键词： nonlinear optics off-axis-rotating elliptical Gaussian beam orbital angular momentum

Bound state noise-like pulses generation from composite filtering effects

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optoelectronics Letters 2025年第3期21卷 142-148页

作者： CHANG Qingyu ZHANG Caishi College of Physics & optoelectronic engineering Jinan University Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano optoelectronic Technology School of Physics and Optoelectronic EngineeringMacau University of Science and Technology school of Innovation engineering Macau University of Science and Technology

This paper demonstrated the generation of multi-wavelength bound state noise-like pulse (BNLP) in a dispersion-managed composite-filtered fiber laser consisting of nonlinear polarization rotation (NPR) and *** the case of BNLP,the generation is caused by the interaction between two noise-like pulses (NLPs) induced by the comb-filtering effect,and bound state level can be artificially controlled in the *** work provides a new method for generating low-coherence pulses and establishes a research idea for the study of the comb-filtering effects.

关键词： A

A donor-acceptor conjugated bipolar polymer with multielectron redox sites for long-cycle-life and high-rate aqueous zinc dual-ion batteries

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Journal of Energy Chemistry 2025年第3期102卷 144-150页

作者： Lian-Wei Luo Siteng Zhu Wen Yan Ma Dan Li Chong Zhang Jia-Xing Jiang Key Laboratory of optoelectronic Chemical Materials and Devices (Ministry of Education) School of Optoelectronic Materials & Technology Jianghan University Key Laboratory for Macromolecular Science of Shaanxi Province Shaanxi Engineering Laboratory for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University

Aqueous zinc-ion batteries（AZIBs） have hugely latent advantages in large-scale energy storage due to its innate safety,reasonable price,and ***,most AZIB cathode materials suffer from short cycling life and poor rate ***,a bipolar donor-acceptor（D-A） conjugated microporous polymer（PTZ-BDTB）,consisting of electron-withdrawing benzo[1,2-b:4,5-b']dithiophene-4,8-dio ne（BDTB） units and electron-donating phenothiazine（PTZ） units,is developed as the cathode material of aqueous zinc dual-ion batteries（AZDIBs）.The D-A type structure design could reduce the band gap,thus promoting electron transfer in the polymer ***,the PTZ-BDTB cathode in a30 mol/kg（m） ZnCl2water-in-salt electrolyte exhibits a high reversible capacity of 202 mA h g-1at0.05 A g-1with excellent rate performance(109 mA h g-1at 15 A g-1),which is far superior to its counterpart polymers PPTZ and ***,PTZ-BDTB shows ultra-stable cycle performance with capacity retention ratios of 76.2% after 460 cycles at 0.05 A g-1and 96% after 27000 cycles at 5 A *** also exhibits a low self-discharge ability with capacity retention about 76.4% after resting the battery for 28 *** results demonstrate that D-A type structural design is a promising strategy for constructing high performance cathode materials for AZDIBs.

关键词： Aqueous zinc dual-ion batteries Bipolar organic cathode material Conjugated microporous polymer Donor-acceptor structure

A low-cost wide bandgap polymer based on carboxylate substituted thiazole enables efficient organic solar cells with remarkable batch-to-batch reproducibility

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Science China Chemistry 2025年第2期68卷 733-744页

作者： Xiaodong Zhu Yuchen Lei Jianhong Gao Yanjun He Jinsicheng Liu Qian Guo Xiang Gao Liwei Xiong Xunchang Wang Renqiang Yang Zhitian Liu Hubei engineering Technology Research Center of optoelectronic and New Energy Materials Hubei Key Laboratory of Plasma Chemistry and Advanced MaterialsSchool of Materials Science and EngineeringWuhan Institute of TechnologyWuhan 430205China Key Laboratory of optoelectronic Chemical Materials and Devices(Ministry of Education) School of Optoelectronic Materials&TechnologyJianghan UniversityWuhan 430056China

Constructing the low-cost,high-efficiency,and good batch-to-batch reproducibility polymer donor is vitally important for the application of organic solar ***,we develop a structurally simple carboxylate-substituted thiazole as an electronwithdrawing building block to construct a low-cost polymer,PBTTzE,containing a facilely prepared chlorinated benzo[1,2-b:4,5-b′]dithiophene(BDTCl)donor *** from synergistic electron deficient effects of chlorination and ester group and C=N,as well as the noncovalent interaction of S…O and S…N,PBTTzE exhibits a deep HOMO energy level(−5.59 eV),and a planar skeleton *** combined with the IT-4F acceptor,the polymer(54 kDa)demonstrated a champion PCE of 15.87%,which is the highest value in the IT-4F-based binary devices to ***,PBTTzE exhibits excellent batch-tobatch reproducibility due to its very similar PCEs within a range of 43–76 *** addition,an alloyed state and complementary absorption can be formed between PM6 and ***,in a ternary device with PBTTzE added to the PM6:BTP-eC9 blend,a top PCE of 18.76%is achieved due to the suppressed energy loss,prolonged exciton diffusion distance,and improved charge *** work demonstrates that the carboxylate-substituted thiazole is a highly promising acceptor unit for constructing low-cost and high-performance polymers.

关键词： carboxylate substituted thiazole polymer donor low-cost batch-to-batch reproducibility organic solar cells

Performance analysis of two-way relay mixed RF/FSO system with co-channel interference

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optoelectronics Letters 2025年第2期21卷 85-89页

作者： WANG Zhuo school of optoelectronic engineering Changchun University of Science and TechnologyChangchun 130022China

In this paper,the performance of a two-way relay (TWR) mixed radio frequency/free space optical (RF/FSO) system with co-channel interference (CCI) is *** from interference-limited one-way relay (OWR) system,CCIs should be considered at both relay and users in TWR ***,opportunistic user schedule is applied to select the user with the largest signal to interference plus noise ratio (SINR).Exact and asymptotic outage probability (OP) is *** bit error rate (BER) is further presented to evaluate the overall *** results show that the performance of a TWR system is dominated by the uplink or downlink whose performance is severer.

关键词： FSO channel system

Enhanced interfacial polarization of SiC/C nanofibers loaded with cobalt ferrite nanoparticles for improved electromagnetic wave absorption

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Science China(Technological Sciences) 2025年第3期68卷 125-137页

作者： Yixuan WANG Wei CUI Zhenxiong LI Lei ZHANG Yang REN Xiongxiong WU Zhihui HE Yashan HUO Center for optoelectronic Information and Transform School of Physics and Electronic InformationYan’an UniversityYan’an716000China school of Chemistry and Chemical engineering Yan’an UniversityYan’an716000China

The unique advantages of heterogeneous interface engineering and its superior electromagnetic properties provide new momentum for designing advanced wave-absorbing *** researchers focus on enhancing wave-absorbing capabilities by increasing interfacial polarization,often overlooking material cost and engineering *** address this,we enhance the heterogeneous interfaces of SiC/C nanofibers(NFs)by loading cobalt ferrite nanoparticles(CFO NPs),exploring a simple,cost-effective strategy to develop high-performance wave-absorbing *** adjusting the CFO concentration,we optimize the dielectric and magnetic losses of the composite to achieve impedance matching and improve absorption *** results show that the SiC/C/CFO20 composite exhibits excellent microwave absorption(MA),achieving a reflection loss(RL)value of-56.52 dB at 11.60 GHz with a matching thickness of 2 mm and an effective absorption bandwidth(EAB)of 5.05 ***,the composite shows outstanding performance in both monostatic and bistatic radar cross section(RCS)simulations,with optimal values reaching-49.04 and-51.16 d B,*** performance demonstrates a wide detection angle,supporting its potential for practical engineering ***,this approach provides a new perspective for designing high-efficiency,low-cost,and scalable wave-absorbing materials for engineering applications.

关键词： composite nanofibers magnetoelectric synergistic effect interface engineering radar cross section

Domain generalization with semi-supervised learning for people-centric activity recognition

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Science China(Information Sciences) 2025年第1期68卷 171-188页

作者： Jing LIU Wei ZHU Di LI Xing HU Liang SONG Academy for engineering & Technology Fudan University Shanghai East-bund Research Institute on Networking Systems of AI school of optoelectronic Information and Computer engineering University of Shanghai for Science & Technology

People-centric activity recognition is one of the most critical technologies in a wide range of real-world applications,including intelligent transportation systems, healthcare services, and brain-computer interfaces. Large-scale data collection and annotation make the application of machine learning algorithms prohibitively expensive when adapting to new tasks. One way of circumventing this limitation is to train the model in a semi-supervised learning manner that utilizes a percentage of unlabeled data to reduce the labeling burden in prediction tasks. Despite their appeal, these models often assume that labeled and unlabeled data come from similar distributions, which leads to the domain shift problem caused by the presence of distribution gaps. To address these limitations, we propose herein a novel method for people-centric activity recognition,called domain generalization with semi-supervised learning(DGSSL), that effectively enhances the representation learning and domain alignment capabilities of a model. We first design a new autoregressive discriminator for adversarial training between unlabeled and labeled source domains, extracting domain-specific features to reduce the distribution gaps. Second, we introduce two reconstruction tasks to capture the task-specific features to avoid losing information related to representation learning while maintaining task-specific consistency. Finally, benefiting from the collaborative optimization of these two tasks, the model can accurately predict both the domain and category labels of the source domains for the classification task. We conduct extensive experiments on three real-world sensing datasets. The experimental results show that DGSSL surpasses the three state-of-the-art methods with better performance and generalization.

关键词： activity recognition deep learning domain generalization semi-supervised learning adversarial training

Recent advances of CuSbS2 and CuPbSbS3 as photocatalyst in the application of photocatalytic hydrogen evolution and degradation

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Chinese Chemical Letters 2025年第3期36卷 65-79页

作者： Xinlong Zheng Zhongyun Shao Jiaxin Lin Qizhi Gao Zongxian Ma Yiming Song Zhen Chen Xiaodong Shi Jing Li Weifeng Liu Xinlong Tian Yuhao Liu school of Marine Science and engineering State Key Laboratory of Marine Resource Utilization in South China SeaSchool of Physics and Optoelectronic EngineeringHainan University school of Chemical engineering and Technology Hainan University school of Cyberspace Security (school of Cryptology) Hainan University Mechanical and Electrical engineering College Hainan University

The realization of high-efficiency photocatalysis is greatly meaningful to overcome the issues of current energy and environment,in which the core factor is the exploration of photocatalysts with promising semiconductor *** Cu-based metal sulfide photocatalysts of CuSbS2and its derivative of bournonite CuPbSbS3possess the features of earth-abundant elements,strong photostability,visiblelight range bandgap,and high absorption coefficient,possessing great potential for the realization of efficient photocatalytic *** the photocatalysts of CuSbS2and CuPbSbS3have been investigated in photocatalysis application of hydrogen production and degradation,the exploration process is still in the early-development *** this review,the design concept and semiconductor properties of CuSbS2and CuPbSbS3are firstly ***,the photocatalytic applications of CuSbS2and CuPbSbS3photocatalysts,mainly including hydrogen production and degradation,are systematically ***,the challenges and prospects for the further exploration of CuSbS2and CuPbSbS3photocatalysts are provided.

关键词： CuPbSbS3 CuSbS2 Degradation Hydrogen production Photocatalysis

Effects of Building Blocks and Defects on the Performance of Two-Dimensional Photonic Crystal Sensors for Black Liquor Detection

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Journal of Analysis and Testing 2025年第1期9卷 50-60页

作者： Jiajia Quan Yu Song Huiyu Li Fangyuan Zhao Lin Zhou Zhongyu Cai Yong Wan College of Physics Science Qingdao UniversityQingdao 266071China school of Instrumentation and optoelectronic engineering School of Space and EnvironmentBeijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100191China

In this study,to achieve convenient and sensitive detection of the concentration of the black liquor solution,we constructed two-dimensional photonic crystal sensors with a periodic arrangement of elliptical and circular pores in a hexagonal *** photonic bandgap in transverse magnetic(TM)mode was analyzed using the plane wave expansion *** was followed by simulations to obtain absorption spectra at different concentrations of black liquor,with subsequent processing and *** simulation results revealed a linear correlation between the concentration of black liquor and the position of the trough in the absorption spectrum under consistent temperature ***,as the concentration of black liquor solution increased,the position of absorption spectra trough shifted towards the low-frequency *** parameters optimization,we achieved a relationship equation with a linear fitting coefficient R^(2)of *** sensitivity of the two-dimensional photonic crystal sensor composed of circular scatters with line defects in the hexagonal lattice can be as high as 508.3 nm/RIU when the mass fraction of black liquor solution ranges from 10 to 20%.These results provide an essential theoretical basis for applying photonic crystal sensors to detect black liquor *** study holds promise for the design and fabrication of high-performance photonic crystal sensors for practical applications.

关键词： Photonic crystal sensors Absorption spectrum Photonic bandgap High sensitivity Black liquor