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revealing the effect of external pressure on solid-electrolyte interphase and lithium plating in lithium-ion batteries

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Journal of Energy Chemistry 2025年第3期102卷 734-744页

作者： rui Xiong Haocheng Li Bing-Ang Mei Hongwen He Weixiang Shen National Engineering Research Center of Electric Vehicles School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 00081China School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyHawthornVictoria 3122Australia

Lithium plating is a detrimental phenomenon in lithium-ion cells that compromises both functionality and *** study investigates electro-chemo-mechanical behaviors of lithium plating in lithium iron phosphate pouch cells under different external *** force microscopy nanoindentation is performed on the graphite electrode to analyze the influence of external pressure on solid-electrolyte interphase(SEI),revealing that the mechanical strength of SEI,indicated by Young's modulus,increases with the presence of external ***,an improved phase field model for lithium plating is developed by incorporating electrochemical parameterization based on nonequilibrium *** results demonstrate that higher pressure promotes lateral lithium deposition,covering a larger area of ***,electrochemical impedance spectroscopy and thickness measurements of the pouch cells are conducted during overcharge,showing that external pressure suppresses gas generation and thus increases the proportion of lithium deposition among galvanostatic overcharge *** integrating experimental results with numerical simulations,it is demonstrated that moderate pressure mitigates SEI damage during lithium plating,while both insufficient and excessive pressure may exacerbate *** study offers new insights into optimizing the design and operation of lithium iron phosphate pouch cells under external pressures.

关键词： Lithium-ion batteries Overcharge Lithium plating Electrochemical mechanics Synergistic effects

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Preamble slice orderly queue access scheme in cell-free dense communication systems

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digital Communications and Networks 2025年第1期11卷 126-135页

作者： Jun Sun Mengzhu Guo Jian Liu School of Telecommunications and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing 210003China School of Computer and Communication Engineering University of Science and TechnologyBeijing 100083China

High reliability applications in dense access scenarios have become one of the main goals of 6G *** solve the access collision of dense Machine Type Communication(MTC)devices in cell-free communication systems,an intelligent cooperative secure access scheme based on multi-agent reinforcement learning and federated learning is proposed,that is,the Preamble Slice Orderly Queue Access(PSOQA)*** this scheme,the preamble arrangement is combined with the access *** preamble arrangement is realized by preamble slices which is from the virtual preamble *** access devices learn to queue orderly by deep reinforcement *** orderly queue weakens the random and avoids collision.A preamble slice is assigned to an orderly access queue at each access *** orderly queue is determined by interaction information among multiple *** the federated reinforcement learning framework,the PSOQA scheme is implemented to guarantee the privacy and security of ***,the access performance of PSOQA is compared with other random contention schemes in different load *** results show that PSOQA can not only improve the access success rate but also guarantee low-latency tolerant performances.

关键词： Machine type communication random access reinforcement learning Access success probability Federated learning

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dual-Mode resonant Sectorial Monopole Antenna with Stable Backfire Gain

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Chinese Journal of Electronics 2024年第6期33卷 1478-1486页

作者： Feiyan JI Heng ZHANG Xiuqiong XING Wenjun LU Lei ZHU Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and Telecommunications Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau

A novel design approach to wideband, dual-mode resonant monopole antenna with stable, enhanced backfire gain is advanced. The sectorial monopole evolves from a linear, 0.75-wavelength electric prototype monopole under wideband dual-mode resonant operation. As theoretically predicted by the two resonant modes TE3/5,1and TE9/5,1within a 150° radiator, the operation principle is revealed at first. As have been numerically demonstrated and experimentally validated at 2.4-GHz band, the designed antenna exhibits a wide impedance bandwidth over 90.1%（i.e., 2.06–5.44 GHz）, in which the stable gain bandwidth in the backfire,-x-direction（θ = 90°, φ = 180°） with peak value of 3.2 dBi and fluctuation less than 3 dB is up to 45.3%（i.e., 3.74–5.44 GHz）. It is concluded that the stable wideband backfire gain frequency response should be owing to the high-order resonant mode in the unique sectorial monopole antennas.

关键词： Fluctuations Azimuth Prototypes Metals resonance Frequency measurement Broadband antennas Impedance Gain Wideband

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Selective recovery of Th(Ⅳ) from radioactive rare earth waste residue by utilizing MoS_(2)-modified ion-absorbed type rare earth tailings

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Journal of rare Earths 2024年第9期42卷 1782-1791,I0005页

作者： Xirong Chen Xinyu Fu Yun Gao Zhiyuan Zeng Bin Huang Xiaoqi Sun Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China Fujian Research Center for Rare Earth Engineering Technology Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen361021China Fujian College University of Chinese Academy of SciencesFuzhou350002China Jiangxi Province Key Laboratory of Cleaner Production of Rare Earths Ganjiang Innovation AcademyChinese Academy of SciencesGanzhouJiangxi341000China

In the process of extracting ion-absorbed rare earth ore(IrEO),the production of radioactive waste is a major environmental *** address this issue,MoS_(2) was used to modify ion-absorbed rare earth tailings(rET) to synthesize a novel MoS_(2)@rET composite material for the effective handling of radioactive waste generated in IrEO separation *** composite material was thoroughly characterized using various analytical techniques,including X-ray diffraction(Xrd),X-ray photoelectron spectroscopy(XPS),thermogravimetry(TG),Fourier-transform infrared(FTIr),scanning electron microscopy(SEM),Brunaue r-Emmett-Teller(BET) and energy dispersive spectroscopy(EdS).By optimizing the operating parameters,the optimal experimental conditions were determined to be pH=3,contact time=60 min,liquid-solid ratio=6 g/L,and initial concentration=150 mg/*** adsorption data fitted well with the pseudo second-order rate *** thermodynamic parameters concerning the adsorption of Th(Ⅳ) were analyzed and *** isotherm model is a more fitting choice for the adsorption process compared to the Freundlich isotherm ***_(2)@rET was used in the acid leachate of IrEO waste residue,achieving the separation of Th and rare earth *** mechanism of Th(Ⅳ) adsorption by MoS_(2)@rET was investigated,revealing that the adsorption process involves electrostatic interactions,chemical bonding,and redox *** above research results indicate that MoS_(2)@rET composite materials have application potential in the sustainable treatment of IrEO radioactive waste.

关键词： rare earths Thorium radioactive waste residue Adsorption Separation

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Enhanced thermal conductivity of PVdF by filling with T-ZnOw and MWCNT based on hybrid 3d network

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JOUrNAL OF APPLIEd POLYMEr SCIENCE 2024年第34期141卷 e55866-e55866页

作者： Liu, Huili Chen, Huayan Chen, Haodong Wu, Chaoting Jia, Yue Wu, Chunrui Lu, Xiaolong Tiangong Univ State Key Lab Separat Membranes & Membrane Proc Tianjin 300387 Peoples R China Tiangong Univ Sch Mat Sci & Engn Tianjin Peoples R China Tiangong Univ Sch Chem Engn & Technol Tianjin Peoples R China

In this work, a novel approach is taken to enhance the thermal conductivity and mechanical properties of composites by developing highly efficient thermally conductive PVdF-based composites. This is developed by incorporating tetra-pod zinc oxide whiskers (T-ZnOw) in conjunction with multiwalled carbon nanotubes (MWCNT) to form binary hybrid fillers within a polyvinylidene fluoride (PVdF) matrix. Polydopamine (PdA), characterized by physical adsorption, is selected for surface coating on T-ZnOw since T-ZnOw is easy to self-agglomerate and difficult to modify by physical and chemical methods. The coating aims to improve the dispersibility of T-ZnOw and reduce the interfacial thermal resistance with the substrate. MWCNT is oxidized to improve its dispersion ability while strengthening the interaction with the matrix, due to the absence of interaction between MWCNTs and polymer matrix and poor dispersibility with the matrix. The dispersity of PdA@T-ZnOw and o-MWCNT is improved, and the three-dimensional hybrid network structure can be better constructed to improve the thermal conductivity of the composite membrane. At a filler content of 25 wt%, the thermal conductivity reaches 0.302 W m(-1) K-1 for T-ZnOw-MWCNT-PVdF and 0.222 W m(-1) K-1 for PdA@T-ZnOw-o-MWCNT-PVdF.

关键词： composite membranes multi-walled carbon nanotubes polyvinylidene fluoride tetra-pod zinc oxide whisker thermal properties

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distributed Application Addressing in 6G Network

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China Communications 2024年第4期21卷 193-207页

作者： Liu Jie Chen Sibo Liu Yuqin Mo Zhiwei Lin Yilin Zhu Hongmei He Yufeng China Telecom Research Institute Guangzhou 510632China

To ensure the extreme performances of the new 6G services,applications will be deployed at deep edge,resulting in a serious challenge of distributed application *** paper traces back the latest development of mobile network application addressing,analyzes two novel addressing methods in carrier network,and puts forward a 6G endogenous application addressing scheme by integrating some of their essence into the 6G network architecture,combining the new 6G capabilities of computing&network convergence,endogenous intelligence,and communication-sensing *** paper further illustrates how that the proposed method works in 6G networks and gives preliminary experimental verification.

关键词： application addressing CNC(Computing&Network Convergence) dNS(domain Name System) ICN(Information-Centric Network) 6G

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Waveguide-integrated ultra-stable perovskite single-crystal photodetector

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Science China(Technological Sciences) 2025年第2期68卷 106-113页

作者： Zhenyu ZHANG Guoping WANG State Key Laboratory of Radio Frequency Heterogeneous Integration Shenzhen UniversityShenzhen 518060China

Notwithstanding the exceptional photodetection capabilities of the laterally-structured perovskite single-crystal sheet(SCS),attributed to its notably lengthy carrier diffusion length and reduced defect density,operating the device within free space and exposing the SCS to the environment present obstacles in attaining on-chip integration and long-term *** overcome these challenges,this study proposes the introduction of a waveguide(WG)structure methodology,and selects the silicon WG(SWG)core and the polymer polymethyl methacrylate(PMMA)WG(PWG)fiber as ***,it integrates these two WG structures with the laterally-structured SCS photodetector into WG-SCS devices,enabling photodetection under near-field excitation of the ***,the WG-SCS device encapsulated with silicone sealant demonstrates exceedingly high stability,with no degradation in performance after being exposed to light and water stimuli for 1000 *** study demonstrates the viability of on-chip integration of lateral-structured SCS photodetectors by means of introducing WG structures and investigates the technical facets of the device’s long-term environmental *** results are expected to exert a crucial role in device integration in future applications such as optical communication,quantum photonics,and biochemical sensing.

关键词： perovskite single-crystal waveguide integration photodetection stability polymer

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Tuning heterogeneous microstructures to enhance mechanical properties of nano-TiN particle reinforced Haynes 230 composites by laser powder bed fusion

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rare Metals 2024年第9期43卷 4548-4565页

作者： Wen-Jie Liu Hui Li Qian-Xing Yin He-Jun du School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China The Institute of Technological Sciences Wuhan UniversityWuhan 430072China School of Mechanical&Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore

Laser powder bed fusion(LPBF)is considered to be one of the most promising additive manufacturing technologies for producing components with geometries and high geometrical precision that are unattainable by traditional *** superalloy exhibits exceptional mechanical and high-temperature performances,rendering it a prime candidate for advanced aero-engine *** the high demand for LPBF-manufactured superalloys,the superalloy is one of the materials manufactured difficultly by LPBF due to their large laser absorptivity fluctuation,poor molten pool stability and sharp temperature ***,superalloys are characterized by severe pores,undesirable coarse columnar grains and poor mechanical *** this work,the effect of nano-TiN particles on defects,molten pool characteristics and microstructure and performance of the composites were *** 4.5 wt%TiN/Haynes230 samples exhibited exceptional nanohardness and elastic modulus with maximum values reaching 5.53 GPa and 240.03 GPa,*** superior mechanical properties were attributed to the combined effects of spatter and gas pore inhibition,grain refinement and duplex nanophases ***,the stability of molten pool was enhanced,and spatter was effectively suppressed by adding nano-TiN particles,while grain refinement and columnar to equiaxed transitions were ***,the matrix exhibited a high dislocation density due to a significant hindrance of dislocation movement caused by massive nano-phases(e.g.,TiN and M_(23)C_(6)),resulting in the formation of extensive dislocation tangles and *** work offers novel insights into the role of nanoparticles reinforced superalloy composites by LPBF.

关键词： Composites Laser powder bed fusion Molten pool characteristics Microstructure Mechanical properties

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Atomically Substitutional Engineering of Transition Metal dichalcogenide Layers for Enhancing Tailored Properties and Superior Applications

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Nano-Micro Letters 2024年第5期16卷 248-284页

作者： Zhaosu Liu Si Yin Tee Guijian Guan Ming‑Yong Han Institute of Molecular Plus Tianjin UniversityTianjin 300072People’s Republic of China Institute of Materials Research and Engineering A*STARSingapore 138634Singapore

Transition metal dichalcogenides(TMds)are a promising class of layered materials in the post-graphene era,with extensive research attention due to their diverse alternative elements and fascinating semiconductor *** MX2 layers with different metal and/or chalcogen elements have similar structural parameters but varied optoelectronic properties,providing opportunities for atomically substitutional engineering via partial alteration of metal or/and chalcogenide atoms to produce ternary or quaternary *** resulting multinary TMd layers still maintain structural integrity and homogeneity while achieving tunable(opto)electronic properties across a full range of composition with arbitrary ratios of introduced metal or chalcogen to original counterparts(0–100%).Atomic substitution in TMd layers offers new adjustable degrees of freedom for tailoring crystal phase,band alignment/structure,carrier density,and surface reactive activity,enabling novel and promising *** review comprehensively elaborates on atomically substitutional engineering in TMd layers,including theoretical foundations,synthetic strategies,tailored properties,and superior *** emerging type of ternary TMds,Janus TMds,is presented specifically to highlight their typical compounds,fabrication methods,and potential ***,opportunities and challenges for further development of multinary TMds are envisioned to expedite the evolution of this pivotal field.

关键词： Transition metal dichalcogenides Atomic substitution Tailored structure Tunable bandgap Enhanced applications

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Integration of NiTiO3 Films onto TiO2 Nanorods as Photoanodes for Glucose detection with Near-Infrared Light

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ACS APPLIEd NANO MATErIALS 2024年第19期7卷 22684-22693页

作者： Wu, Yahan Zhang, Jiaqi Zhao, Shun Li, Yueping Cai, Pingru Zheng, dandan Cai, Guoen Fang, Yuanxing Fuzhou Univ Coll Chem State Key Lab Photocatalysis Energy & Environm Fuzhou 350116 Peoples R China Fujian Med Univ Inst Clin Neurol Ctr Cognit Neurol Dept NeurolUnion Hosp Fuzhou 350001 Peoples R China Fuzhou Univ Coll Environm & Safety Engn Fuzhou 350116 Peoples R China Fuzhou Univ Sino UK Int Joint Lab Photocatalysis Clean Energy Fuzhou 350108 Fujian Peoples R China

diabetes remains a significant chronic disease, with its prevalence projected to exceed 700 million by 2045. Monitoring glucose levels through conventional methods is crucial for mitigating the associated health risks. In this study, NiTiO3 films are loaded on TiO2 nanorods to create photoanodes, which are applied for glucose detection using near-infrared (NIr) light illumination. This approach achieved a detection limit of 0.01 mM with selectivity reaching up to 95%. Additionally, the long-term stability was confirmed for at least 16 weeks. This study demonstrates the potential of using NiTiO3-based nanomaterials as an NIr-driven sensor for glucose detection.

关键词： nickel titanate infrared glucose detector photoanode oxidation reaction TiO2 nanorods

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