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A Fully-Polarized 1-D Beam-Scanning Phased Array based on Active Integrated Linear Array

IEEE Transactions on Antennas and Propagation 2025年第6期73卷 3593-3604页

作者： Zhang, Lianwei Wang, Kai Gan, Yu Meng, Hongfu Southeast University State Key Laboratory of Millimeter Waves School of Information Science and Engineering Nanjing210096 China

This paper introduces an active integrated fully-polarized architecture of one-dimensional (1-D) beam-scanning planar phased array based on linear arrays. The 1-D scanning capability of this architecture is realized based on compact linear arrays rather than individual units, which utilizes fewer active channels, leading to a substantial decrease in power consumption, heat dissipation requirements and overall system cost, particularly for large-scale phased array implementations. The fully-polarized waves are generated by superposition of two orthogonal linearly polarized waves. With the amplitude and phase of the two orthogonally polarized ports precisely controlled by active chips, the fully-polarized beam-scanning capability is achieved. The theoretical formulation of full-polarization beam-scanning synthesis of this architecture is derived. Then, a 16×24-scale active phased array constructed from 16 linear subarrays is designed, fabricated and measured to validate the effectiveness of the architecture. The operating bandwidth of the antenna covers 10.7 GHz to 12.75 GHz. And the prototype demonstrates a scanning range of ±45° across six typical polarization states, including linear x-polarization, linear y-polarization, linear ±45° polarizations, and both left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP). Moreover, employing the proposed architecture, the power of each unit in this 16×24 phased array is only 0.006w and the ratio of array unit numbers to active channel numbers is 12. Combining the full-polarization scanning capability with the high-gain, ultra-low power consumption and cost-effective attributes, the proposed active phased array positions it as a promising alternative for advanced satellite communication applications. © 1963-2012 IEEE.

关键词： Microstrip antennas

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Deep eutectic solvent-induced controllable synthesis of bifunctional Ni–Fe–P catalysts for electrochemical water splitting

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Green Chemical engineering 2025年第1期6卷 93-101页

作者： Ruichang Xue Rongrong Deng Yan Li Mengqiu Gao Jiafu Wang Qibo Zhang Key Laboratory of Ionic Liquids Metallurgy Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province

Developing electrocatalysts with excellent activity,high stability,and low cost is vital for large-scale hydrogen production through electrochemical water ***,a bifunctional Ni-Fe-P catalyst in situ grown on Fe foam（Ni-Fe-P/FF） is developed by a simple one-step solvothermal process in the deep eutectic solvent（DES） of ethylene glycol and choline chloride（named Ethaline）.The unique solvent environment of Ethaline assisted with the regulating effect of the introduced Fe（Ⅲ） ions shows an essential role in governing the preparation *** developed Ni-Fe-P/FF acts as the efficient bifunctional electrocatalyst for water splitting in 1.0 M KOH,requiring overpotentials of 82 mV（229 mV） and 263 mV（370 mV） to deliver 10 mA cm-2(100 mA cm-2) for oxygen and hydrogen evolution reactions,***,the self-supported catalyst-assembled electrolyzer also exhibits good catalytic performance with a low voltage of 1.83 V to drive 100 mA cm-2and good stability over 100 *** work offers a facile approach to fabricating high-performance bifunctional Ni-Fe-P electrocatalysts to catalyze water splitting.

关键词： Solvothermal synthesis Deep eutectic solvent Ni–Fe–P catalyst Overall water splitting

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Furan-derived Schiff base covalent adaptable thermosets with recyclability and anti-flammability

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Green Chemical engineering 2024年第3期5卷 364-373页

作者： Ping Zhang Shuyu Jia Ruishi Xie Lin Chen Ying Xiong State Key Laboratory of Environment-friendly Energy Materials School of Materials Science and EngineeringSouthwest University of Science and TechnologyMianyang621010China

Conventional thermosetting polymers,mostly derived from nonrenewable petroleum resources,are not reprocessable and recyclable due to their highly cross-linked three-dimensional networks and face the disadvantage of high *** solve these issues,in this study,we synthesized a novel Schiff base covalent adaptable thermoset from a furan-derived tri-aldehyde monomer(TMFP)and a furan-derived di-amine monomer(DFDA).The as-prepared TMFP-DFDA-Vitrimer exhibited superior anti-flammability with a high limiting oxygen index(LOI)of 35.0%and a UL-94 V-0 rating,which was attributed to the excellent charring ***,TMFPDFDA-Vitrimer could also be conveniently recycled by chemical decomposition under a mixed hydrochloric acid/tetrahydrofuran(HCl/THF)*** recycling for 5 times,the thermal,mechanical,and flame retardant properties of the recycled TMFP-DFDA-Vitrimer retained almost unchanged compared to the original *** work provides a prime instance to develop advanced thermosetting polymers from abundant furan-based compounds.

关键词： Furan-based compounds Vitrimer Recyclability Flame retardancy

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Emerging Bio-relevant Applications of Polymer Mechanochemistry

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Chinese Journal of Chemistry 2024年第17期42卷 2066-2070页

作者： Wenjie Liu Hai Qian State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200438China

Polymer mechanochemistry has rapidly evolved since the *** advancements highlight the development of mechanophore platforms for the controlled release of bioactive payloads and the exploration of biocompatible activation *** platforms,ranging from furan-maleimide Diels-Alder adducts to disulfide motifs withβ-carbonate linkages,demonstrate promising prospects in targeted drug ***,supramolecular assemblies and free radical-generating mechanophores present innovative avenues for potential therapeutic *** activation methods,notably high-intensity and/or low-intensity focused ultrasound,hold potential for in vivo ***,challenges persist in comprehending the fundamental physics of ultrasound and its utilization for activation.

关键词： Polymer mechanochemistry Mechanophores Bio-relevant applications Ultrasound Drug delivery

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Deliberate design of MOF-based pre-catalyst rationalizing the structural reconstruction toward efficient oxygen evolution reaction

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science China Chemistry 2025年第6期68卷 2388-2398页

作者： Yunhui Chen Meng Tian Zhongqi Zhang Guangzhao Wang Yan Guo Jing Wu Dawei Qi Zhenhua Yan Xiangyu Liu Xi Liu State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia University Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology of Chongqing School of Electronic Information Engineering Yangtze Normal University Frontiers Science Center for New Organic Matter Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) State Key Laboratory of Advanced Chemical Power Sources College of Chemistry Nankai University School of Chemistry and Chemical Engineering In-situ Center for Physical Sciences Frontiers Science Center for Transformative MoleculesShanghai Jiao Tong University

Metal-organic frameworks（MOFs）, that have emerged as promising electrocatalysts in oxygen evolution reaction（OER）,usually undergo structural reconstruction to form metal hydroxides as active sites. However, it remains a great challenge to design and synthesize ideal MOF-based pre-catalysts for properly cognizing and utilizing the reconstruction process toward efficient OER activity. Herein, the well-defined MOF-808 is post-modified by 2-hydroxyphosphonoacetic acid（HPAA） to form a micro-adsorber that enables to capture of metal ions effectively. Fe3+and Ni2+ions are synergistically anchored into the microadsorber, developing a Fe/Ni-containing pre-catalyst that can be dynamically electrooxidized to be an active and stable dual-site electrocatalyst denoted by R-MOF-HPAA@Fe Ni with abundant metal sites. As a result, R-MOF-HPAA@Fe Ni exhibits an excellent OER performance with a low overpotential of 272 m V and Tafel slope of 35.9 m V dec-1, as well as long-term stability over 300 h at 10 m A cm-2. Experiments and theoretical calculations suggest the resulting catalyst mainly follows a lattice oxygen mechanism（LOM） of dual-metal-site mechanism（DMSM）. Owing to the chelating role of HPAA, the post-synthesized MOFHPAA behaves as a trap to uniformly and firmly adhere Fe3+and Ni2+ions, leading to a functionalized MOF-based pre-catalyst which can be structurally evolved into atomic level-distributed OER electrocatalysts.

关键词： metal-organic frameworks functionalization electrochemical reconstruction electrocatalyst oxygen evolution reaction

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Highly Conductive Proton Selectivity Membrane Enabled by Hollow Carbon Sieving Nanospheres for Energy Storage Devices

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engineering 2023年第9期28卷 69-78页

作者： Kang Huang Shuhao Lin Yu Xia Yongsheng Xia Feiyan Mu Yuqin Lu Hongyan Cao Yixing Wang Weihong Xing Zhi Xu State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

Ion conductive membranes(ICMs)with highly conductive proton selectivity are of significant importance and greatly desired for energy storage ***,it is extremely challenging to construct fast proton-selective transport channels in ***,a membrane with highly conductive proton selectivity was fabricated by incorporating porous carbon sieving nanospheres with a hollow structure(HCSNs)in a polymer *** to the precise ion sieving ability of the microporous carbon shells and the fast proton transport through their accessible internal cavities,this advanced membrane presented a proton conductivity(0.084 S·cm^(-1))superior to those of a commercial Nation 212(N212)membrane(0.033S·cm^(-1))and a pure polymer membrane(0.049 S·cm^(-1)).The corresponding proton selectivity of the membrane(6.68×10^(5) S·min·cm^(-3))was found to be enhanced by about 5.9-fold and 4.3-fold,respectively,compared with those of the N212 membrane(1.13×10^(5) S·min·cm^(-3))and the pure membrane(1.56×10^(5) S·min·cm^(-3)).Low-field nuclear magnetic resonance(LF-NMR)clearly revealed the fast protonselective transport channels enabled by the HCSNs in the polymeric *** proposed membrane exhibited an outstanding energy efficiency(EE)of 84%and long-term stability over 1400 cycles with a0.065%capacity decay per cycle at 120 mA·cm^(-2) in a typical vanadium flow battery(VFB)system.

关键词： Ion conductive membrane Hollow carbon sieving nanosphere Proton transport channel Flow battery

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Experiments and kinetic modeling of the sorbitol dehydration to isosorbide catalyzed by sulfuric acid under conditions of non-constant volume

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Chinese Journal of Chemical engineering 2024年第9期73卷 281-289页

作者： Dechang Cheng Zhihong Ma Ziyang Liu Xiaohui Liu Tao Liu Weizhen Sun Ling Zhao State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China Shanghai Key Laboratory of Functional Materials Chemistry Research Institute of Industrial CatalysisSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

Isosorbide is a novel bio-based material derived as a secondary dehydration product of *** work focuses on the kinetics of sulfuric acid-catalyzed dehydration of sorbitol under conditions of nonconstant ***,the effects of stirring rate,catalyst dosage,reaction temperature,and reaction time on the dehydration reaction of sorbitol were *** yield of isosorbide up to 77.13%was obtained after 1.5 h of reaction time under conditions of 2 kPa,1.0%(mass)catalyst dosage,and 413.15 *** on the sorbitol dehydration reaction mechanism and a simplified reaction network,a kinetic model was developed in this work.A good agreement was accomplished between kinetic modeling and experiments between 393.15 and 423.15 *** fitting results indicate that side reactions with higher activation energies are more affected by reaction temperatures,and the main side reaction that influences the selectivity of isosorbide is the oligomerization reaction among the primary dehydration products of *** model fitting of the catalyst amounts effect shows that the effective concentration of sulfuric acid would be reduced with the increase of dosage due to the molecular agglomeration ***,the kinetic experiments and modeling results obtained in this work will be helpful to the design and optimization of the industrial sorbitol dehydration process.

关键词： Isosorbide Sorbitol dehydration Non-constant volume Kinetic modeling

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Evaluation of SC-CO_(2)-brine on the micro-mechanical properties of lamina shales by micro-scratch test

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Petroleum science 2024年第6期21卷 4204-4218页

作者： Liu Yang Zhao-Yang Liu Yuan-Xun Nie Zhen-Chuan Han Fei Gong Ming-Jun Li Yan Liu State Key Laboratory for Tunnel Engineering China University of Mining&Technology(Beijing)Beijing100083China School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing100083China Department of Hydraulic Engineering State Key Laboratory of Hydro science and EngineeringTsinghua UniversityBeijing100084China

The mechanism of SC-CO_(2)-brine-rock interaction(SCBRI) and its effect on the mechanical properties of shale are crucial for shale oil development and CO_(2)sequestration. To clarify the influence of SCBRI on the micromechanics of shale, the lamina and matrix of shale were saturated with SC-CO_(2)-brine for 2, 4, 6,and 8 days, respectively. The micro-scratch technique was then used to measure the localized fracture toughness before and after SC-CO_(2)-brine saturation. Combining the micro-scratch results with SEM-QEMSCAN-EDS analysis, the differences in mineral composition and mechanical properties of lamina(primarily composed of carbonate minerals) and matrix(primarily composed of clay minerals) were studied. The QEMSCAN analysis and micro-scratch results indicate distinct mineralogical compositions and mechanical properties between the lamina and the matrix. The results showed that:(1) SCBRI leads to the decrease in carbonate mineral content and the significant increase in matrix porosity and laminar cracks. In addition, the damage degree increased at saturation for 6 days.(2) SCBRI weakens the mechanical properties of shale. The scratch depth of laminar and matrix increased by 34.38% and 1.02%, and the fracture toughness decreased by 34.38% and 13.11%. It showed a trend of first increasing and then decreasing.(3) SCBRI enhances the plastic deformation behavior of shale, and the plastic index of lamina and matrix increases by 18.75% and 21.58%, respectively. These results are of great significance for evaluating the mechanical properties of shale oil and gas extraction by CO_(2).

关键词： Lamina shale SC-CO_(2)-brine-rock interaction Micro-scratch test Micro-mechanical properties Elastic-plastic failure mechanism

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High-temperature BaTiO_(3) -based ceramic capacitors by entropy engineering design

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Journal of Advanced Ceramics 2024年第9期13卷 1498-1504页

作者： Yan Song Min Zhang Shun Lan Bingbing Yang Yiqian Liu Ce-Wen Nan Yuan-Hua Lin State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China

High-performance BaTiO_(3)(BTO)-based dielectric ceramics have great potential for high-power energy storagedevices. However, its poor temperature reliability and stability due to its low Curie temperature impedes the development ofmost electronic applications. Herein, a series of BTO-based ceramics are designed and prepared on the basis of entropyengineering. Owing to the incorporation of Bi(Mg_(0.5)Ti_(0.5))O_(3), relaxation behavior and low dielectric loss at high temperatureshave been achieved. Moreover, the high-entropy strategy also promotes lattice distortion, grain refinement and excellentresistance, which together increase the breakdown field strength. These simultaneous effects result in outstanding energystorage performance, ultimately achieving stable energy density (U_(e)) of 5.76 J·cm^(−3) and efficiency ( η) of 89%. Mostimportantly, the outstanding temperature stability makes high-entropy BTO-based ceramics realize a significant energystorage density of 4.90 0.14 J·cm^(−3) with the efficiency above 89%, spanning a wide temperature range of 25–250 ℃, aswell as cycling reliability with negligible performance deterioration after 3 105 cycles at 300 kV∙cm^(−1) and 200 ℃. Thisresearch presents an effective method for designing temperature-stable and reliable dielectrics with comprehensive energystorage performance.

关键词： BaTiO_(3)-based ceramics high-entropy effects high-temperature energy storage cycling reliability

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Tuning the solubility of polysulfides for constructing practical lithium-sulfur battery

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Journal of Energy Chemistry 2024年第8期95卷 611-617,I0013页

作者： Jiapeng Li Jianlong Cong Haijin Ji Ting Shi Lixia Yuan Yunhui Huang State Key Laboratory of Material Processing and Die&Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

Li-S batteries are regarded as one of the most promising candidates for next-generation battery systems with high energy density and low ***,the dissolution-precipitation reaction mechanism of the sulfur(S)cathode enhances the kinetics of the redox processes of the insulating sulfu r,which also arouses the notorious shuttle effect,leading to serious loss of S species and corrosion of Li *** get a balance between the shuttle restraining and the kinetic property,a combined strategy of electrolyte regulation and cathode modification is proposed via introducing 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoroprpyl ether(HFE)instead of 1,2-dimethoxyethane(DME),and SeS_(7)instead of S_*** introduction of HFE tunes the solvation structure of the LiTFSI and the dissolution of intermediate polysulfides with Se doping(LiPSSes),and optimize the interface stability of the Li anode *** minor Se substitution compensates the decrease in kinetic due to the decreased solubility of *** this way,the Li-SeS_(7)batteries deliver a reversible capacity of 1062 and 1037 mAh g^(-1)with 2.0 and 5.5 mg SeS_(7)cm^(-2)loading condition,***,an electrolyte-electrode loading model is established to explain the relationship between the optimal electrolyte and cathode *** makes more sense to guide the electrolyte design for practical Li-S batteries.

关键词： Li-S batteries Lithium polysulfides Solubility Shuttle effect Interface Se doping

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